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WO2016042993A1 - Système d'alimentation en liquide - Google Patents

Système d'alimentation en liquide Download PDF

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Publication number
WO2016042993A1
WO2016042993A1 PCT/JP2015/073977 JP2015073977W WO2016042993A1 WO 2016042993 A1 WO2016042993 A1 WO 2016042993A1 JP 2015073977 W JP2015073977 W JP 2015073977W WO 2016042993 A1 WO2016042993 A1 WO 2016042993A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
gas
flow path
pressure
liquid
Prior art date
Application number
PCT/JP2015/073977
Other languages
English (en)
Japanese (ja)
Inventor
雅樹 片岡
柴田　博司
Original Assignee
富士フイルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to JP2016548797A priority Critical patent/JP6072380B2/ja
Priority to DE112015004254.7T priority patent/DE112015004254B4/de
Publication of WO2016042993A1 publication Critical patent/WO2016042993A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/19—Ink jet characterised by ink handling for removing air bubbles

Definitions

  • the present invention relates to a liquid supply system.
  • Patent Document 1 discloses an image forming apparatus that includes a distribution tank that supplies ink to a plurality of ejection heads, and that relieves pressure fluctuations of the ink in the distribution tank by a damper portion provided on a side surface of the distribution tank. Yes.
  • Patent Document 2 discloses a liquid supply mechanism in which a shock absorber is provided in a branch path branched from a supply side manifold that supplies ink to a plurality of ejection modules, and the pressure fluctuation in the supply side manifold is reduced by the shock absorber. Has been.
  • the present invention has been made in consideration of the above facts, and an object of the present invention is to provide a liquid supply system capable of obtaining uniform damper performance in all of the plurality of head modules.
  • a plurality of individual flow paths respectively communicating with a plurality of head modules are connected in parallel, and the head modules are connected via the individual flow paths.
  • the gas chamber provided by partitioning the common flow path with the elastic member is provided in a position parallel to the common flow path and facing the individual flow path.
  • the pressure fluctuation generated in the flow direction of the liquid in the individual flow path can be directly mitigated by the gas chamber provided in the pressure fluctuation direction. Therefore, sufficient damper performance can be obtained.
  • the gas chamber is provided at a position facing each individual flow path, uniform damper performance can be obtained in all the head modules.
  • the liquid supply system according to the second embodiment of the present invention is the liquid supply system according to the first embodiment, and has gas holding means for holding and discharging the gas inside the gas chamber.
  • the gas inside the gas chamber can be held by the gas holding means. For this reason, compared with the case where the gas chamber is open
  • the gas holding means includes a communication path that connects the gas chamber and the atmosphere, and an open / close control that controls opening and closing of the communication path. Means.
  • the gas inside the gas chamber can be held by the communication path that communicates the gas chamber and the atmosphere and the opening / closing control means that controls the opening and closing of the communication path.
  • the gas holding means can be provided at low cost.
  • a liquid supply system is the liquid supply system according to any one of the first to third embodiments.
  • the control means controls the pressure of the gas inside the gas chamber. It has.
  • the pressure of the gas inside the gas chamber can be controlled by the control means. Since the pressure of the gas inside the gas chamber can be controlled according to the pressure of the supply liquid, a higher damper performance can be obtained compared to a configuration in which the pressure of the gas inside the gas chamber cannot be controlled.
  • the liquid supply system according to the fifth embodiment of the present invention is the liquid supply system according to the fourth embodiment, wherein the control means is a gas pressure control means for directly controlling the pressure of the gas inside the gas chamber.
  • the gas pressure inside the gas chamber can be directly controlled by the gas pressure control means.
  • the liquid supply system according to the sixth embodiment of the present invention is the liquid supply system according to the fourth embodiment, wherein the control means controls the pressure of the liquid in the common flow path to control the pressure of the gas inside the gas chamber.
  • the control means controls the pressure of the liquid in the common flow path to control the pressure of the gas inside the gas chamber.
  • a liquid pressure control means for controlling the pressure.
  • the pressure of the gas inside the gas chamber can be controlled by controlling the pressure of the liquid in the common flow path by the liquid pressure control means.
  • a liquid supply system is the liquid supply system according to any one of the first to sixth embodiments, in the normal ejection in which the liquid is ejected from the ejection port of the head module.
  • the pressure of the gas in the gas chamber is changed at the time of pressurization maintenance in which the liquid in the head module is pressurized as compared with the normal ejection and the liquid is discharged from the ejection port of the head module.
  • the gas pressure in the gas chamber is changed during normal injection and during pressurized maintenance. For this reason, the degree of relaxation of the pressure fluctuation of the liquid by the gas chamber can be changed between the normal injection and the pressurization maintenance.
  • a liquid supply system is the liquid supply system according to any one of the first to seventh embodiments, wherein the liquid is ejected from the ejection port of the head module during normal ejection. And the pressure of the gas in the gas chamber is changed at the time of discharging the bubble from which the bubble is discharged from the bubble removal channel provided on the downstream side in the common channel.
  • the pressure of the gas in the gas chamber is changed between normal injection and bubble discharge. For this reason, it is possible to change the flow velocity of the liquid at the same flow rate by changing the cross-sectional area of the common flow channel during normal injection and when discharging bubbles.
  • the liquid supply system according to the ninth embodiment of the present invention in the liquid supply system according to the eighth embodiment, periodically changes the pressure of the gas in the gas chamber when bubbles are discharged.
  • liquid supply system by periodically changing the pressure of the gas in the gas chamber at the time of discharging the bubbles, it is possible to promote the discharge of the bubbles and efficiently discharge the bubbles.
  • the liquid supply system according to a tenth embodiment of the present invention is the liquid supply system according to any one of the first to ninth embodiments, wherein the common flow path is a common supply liquid to the head module.
  • a supply flow path and a common recovery flow path for recovering liquid from the head module are provided, and a liquid circulation flow path is formed by the common supply flow path and the common recovery flow path.
  • the pressure fluctuation of the liquid in the liquid circulation channel including the common supply channel that supplies the liquid to the head module and the common recovery channel that recovers the liquid from the head module. Can also be relaxed by the gas chamber.
  • the liquid supply system according to an eleventh embodiment of the present invention is the liquid supply system according to the tenth embodiment, wherein the liquid supply system according to the tenth embodiment is configured so that the liquid is supplied from the injection port of the head module.
  • the gas pressure is higher than the gas pressure inside the gas chamber of the common recovery channel.
  • the pressure of the gas inside the gas chamber of the common supply flow path is higher than the pressure of the gas inside the gas chamber of the common recovery flow path.
  • the difference in liquid pressure between the common supply channel and the common recovery channel As a result, liquid flows from the common supply channel to the common recovery channel.
  • a liquid supply system is the liquid supply system according to the eleventh embodiment, wherein a gas tank that communicates with the gas chamber and holds the gas is provided, and the capacity of the gas tank of the common supply flow path Is larger than the capacity of the gas tank of the common recovery channel.
  • the capacity of the gas tank in the common supply flow path is larger than the capacity of the gas tank in the common recovery flow path.
  • a liquid supply system is the liquid supply system according to any one of the first to twelfth embodiments, wherein the common flow path includes a plurality of gas chambers each provided with a gas chamber.
  • the common flow path component members are connected in series.
  • the common flow path is configured by connecting a plurality of common flow path constituent members in series.
  • the liquid supply system according to a fourteenth embodiment of the present invention is the liquid supply system according to the thirteenth embodiment, wherein a communication path that communicates the gas chamber and the atmosphere is provided, and the communication path is a connection of common flow path components. Each is provided in a direction orthogonal to the direction.
  • the communication passages that communicate the gas chamber and the atmosphere are provided in directions orthogonal to the connection direction of the common flow path component members.
  • uniform damper performance can be obtained in all of the plurality of head modules.
  • FIG. 1 is an overall configuration diagram illustrating an image recording apparatus including a liquid supply system according to a first embodiment of the present invention.
  • FIG. 2 (A) is a piping diagram showing the liquid supply system according to the first embodiment of the present invention
  • FIG. 2 (B) is a partially enlarged view thereof.
  • FIGS. 3A and 3B are cross-sectional views showing a common flow path during normal injection of the liquid supply system according to the first embodiment of the present invention.
  • 4 (A) and 4 (B) are cross-sectional views showing a common flow path during pressure maintenance of the liquid supply system according to the first embodiment of the present invention.
  • FIGS. 5A to 5C are cross-sectional views showing a common flow path during pressure maintenance of the liquid supply system according to the first embodiment of the present invention.
  • FIGS. 13A and 13B are cross-sectional views showing a common flow path when bubbles are discharged in the liquid supply system according to the fourth embodiment of the present invention.
  • 14 (A) and 14 (B) are perspective cross-sectional views showing a common flow path when bubbles are discharged in a liquid supply system according to another embodiment of the present invention.
  • the image recording apparatus 10 uses aqueous ultraviolet ink (ultraviolet curable ink using an aqueous medium) as a photocurable ink on a sheet recording medium (paper) P. It is set as the structure which records an image by the inkjet system using it.
  • the image recording apparatus 10 includes a paper feeding unit 12 that feeds the recording medium P, a conveying unit that conveys the recording medium P, a processing liquid applying unit 14, a processing liquid drying processing unit 16, and an ink ejecting unit.
  • the paper feed unit 12 is configured to feed the recording media P loaded on the paper feed tray 30 to the processing liquid application unit 14 one by one.
  • the sheet feeding unit 12 as an example of a sheet feeding unit mainly includes a sheet feeding table 30, a soccer device 32, a sheet feeding roller pair 34, a feeder board 36, a front pad 38, and a sheet feeding drum 40. Has been.
  • the recording medium P is placed on the sheet feeding table 30 in a bundle of many sheets.
  • the sheet feed table 30 is provided so as to be lifted and lowered by a sheet feed table lifting device (not shown).
  • the drive is controlled in conjunction with the increase / decrease of the recording media P stacked on the paper feed platform 30, and the recording medium P positioned at the top of the bundle is always positioned at a constant height.
  • the sheet feeding table 30 is configured to move up and down.
  • general-purpose printing paper used in general offset printing or the like (so-called high-quality paper, coated paper, paper mainly composed of cellulose such as art paper) is used as the recording medium P.
  • the recording media P loaded on the paper feed table 30 are picked up one by one from the top and fed to the paper feed roller pair 34.
  • the soccer device 32 includes a suction foot 32A provided so as to be movable up and down and swingable. The upper surface of the recording medium P is sucked and held by the suction foot 32A, and the recording medium P is conveyed from the paper feed table 30 to the paper feed roller pair. At this time, the suction foot 32A sucks and holds the top surface of the recording medium P positioned at the top of the bundle to pull up the recording medium P, and the leading end of the recording medium P that is pulled up constitutes a paper feed roller pair 34. It is set as the structure inserted between a pair of roller 34A and roller 34B.
  • the paper feed roller pair 34 includes a pair of upper and lower rollers 34A and 34B that are pressed against each other.
  • One of the pair of upper and lower rollers 34A and 34B is a driving roller (for example, roller 34A) and the other is a driven roller (for example, roller 34B).
  • the drive roller is connected to a motor (not shown) and is driven to rotate by the rotation of the motor.
  • the motor is driven in conjunction with the feeding of the recording medium P.
  • the driving roller is rotated in accordance with the timing.
  • the recording medium P inserted between the pair of upper and lower rollers 34 ⁇ / b> A and 34 ⁇ / b> B is nipped by the rollers 34 ⁇ / b> A and 34 ⁇ / b> B and sent out in the direction in which the feeder board 36 is installed.
  • the feeder board 36 is formed to correspond to the width of the recording medium, and is configured to guide the recording medium P sent out from the paper feed roller pair 34 to the front pad 38.
  • the feeder board 36 is installed to be inclined downward, and the recording medium P placed on the conveying surface of the conveying path of the feeder board 36 is slid along the conveying surface and guided to the front pad 38. .
  • the feeder board 36 is provided with a plurality of tape feeders 36A that convey the recording medium P and have the conveying direction as a longitudinal direction at intervals in the width direction.
  • the tape feeder 36A is formed in an endless shape and is configured to rotate using a motor (not shown) as a drive source.
  • the recording medium P placed on the conveyance surface of the feeder board 36 is conveyed on the feeder board 36 by the tape feeder 36A.
  • the front pad 38 is configured to correct the posture of the recording medium P.
  • the front pad 38 is formed in a plate shape, and a plate-like surface is disposed orthogonal to the conveyance direction of the recording medium P. Further, the front pad 38 is connected to a motor (not shown), and is driven to swing by the motor. When the leading edge of the recording medium P conveyed on the feeder board 36 comes into contact with the front pad 38, the conveying posture of the recording medium P is corrected (so-called skew prevention is performed).
  • the front pad 38 is swung in conjunction with the feeding of the recording medium P to the paper feeding drum 40, and the recording medium P whose transport posture is corrected is delivered to the paper feeding drum 40.
  • the paper feed drum 40 receives the recording medium P fed from the feeder board 36 through the front pad 38 and transports it to the processing liquid application unit 14.
  • the paper feed drum 40 is formed in a cylindrical shape, is connected to a motor (not shown), and is configured to rotate by driving from this motor.
  • a gripper 40A is provided on the outer peripheral surface of the paper supply drum 40, and the leading end of the recording medium P is gripped by the gripper 40A.
  • the paper feed drum 40 conveys the recording medium P to the treatment liquid application unit 14 while winding the recording medium P on the peripheral surface by gripping and rotating the tip of the recording medium P with the gripper 40A.
  • the processing liquid applying unit 14 applies a predetermined processing liquid to the surface (image recording surface) of the recording medium P.
  • the treatment liquid application unit 14 mainly applies a treatment liquid application drum 42 that conveys the recording medium P, and a treatment liquid application that applies a predetermined treatment liquid to the image recording surface of the recording medium P that is conveyed by the treatment liquid application drum 42.
  • a unit 44 The treatment liquid applied to the surface of the recording medium P aggregates the color material (pigment) in the photocurable ink that is ejected (dropped) onto the recording medium P in the image recording unit 18 disposed on the downstream side in the transport direction. It is the flocculant which has the function to make it.
  • the treatment liquid application drum 42 conveys the recording medium P conveyed from the paper supply drum 40 of the paper supply unit 12 to the treatment liquid drying processing unit 16.
  • the treatment liquid application drum 42 is formed in a cylindrical shape, is connected to a motor (not shown), and is configured to be driven by the rotation of this motor.
  • a gripper 42A is provided on the outer peripheral surface of the treatment liquid application drum 42, and the leading end of the recording medium P is gripped by the gripper 42A.
  • the treatment liquid application drum 42 conveys the recording medium P to the treatment liquid drying processing unit 16 while winding the recording medium P on the peripheral surface by gripping and rotating the tip of the recording medium P with the gripper 42A. . When the treatment liquid application drum 42 rotates once, one recording medium P is conveyed.
  • the processing liquid application drum 42 and the paper feed drum 40 are controlled in rotation by matching the timings of receiving and delivering the recording medium P with each other. That is, the treatment liquid application drum 42 and the paper feed drum 40 are driven with their peripheral speeds matched, and are driven with the positions of the grippers 40A and 42A matched.
  • the treatment liquid is applied to the surface of the recording medium P conveyed by the treatment liquid application drum 42 with a roller.
  • the processing liquid application unit 44 mainly pumps up the application roller 44A for applying the processing liquid to the recording medium P, the processing liquid tank 44B for storing the processing liquid, and the processing liquid stored in the processing liquid tank 44B,
  • the pumping roller 44 ⁇ / b> C is supplied to the application roller 44 ⁇ / b> A.
  • the processing liquid is applied by a roller, but the method of applying the processing liquid is not limited to this.
  • a method of applying using an inkjet head or a method of applying using a spray may be employed.
  • the processing liquid drying processing unit 16 In the processing liquid drying processing unit 16, the recording medium P having the processing liquid applied to the surface is dried.
  • the processing liquid drying processing unit 16 mainly performs drying air on the image recording surface of the recording medium P transported by the processing liquid drying processing drum 46 that transports the recording medium P, the paper transport guide 48, and the processing liquid drying processing drum 46.
  • the processing liquid drying processing drum 46 is configured to receive the recording medium P from the processing liquid application drum 42 of the processing liquid application unit 14 and to transport the recording medium P to the image recording unit 18.
  • the treatment liquid drying treatment drum 46 is configured by a cylindrical frame, is connected to a motor (not shown), and is driven by the rotation of the motor.
  • a gripper 46A is provided on the outer peripheral surface of the processing liquid drying processing drum 46, and the leading end of the recording medium P is gripped by the gripper 46A.
  • the processing liquid drying processing drum 46 conveys the recording medium P to the image recording unit 18 by gripping and rotating the tip of the recording medium P with the gripper 46A.
  • processing liquid drying processing drum 46 in the present embodiment is configured such that grippers 42A are disposed at two locations on the outer peripheral surface, and the two recording media P are conveyed by one rotation.
  • the rotation of the processing liquid drying processing drum 46 and the processing liquid applying drum 42 is controlled by matching the timings of receiving and transferring both recording media P. That is, the processing liquid drying processing drum 46 and the processing liquid application drum 42 are driven with their peripheral speeds matched, and are driven with the positions of the grippers 42A and the grippers 46A of each other.
  • the paper transport guide 48 is disposed around the outer periphery of the processing liquid drying processing drum 46 along the transport path of the recording medium P.
  • the paper transport guide 48 guides the recording medium P so as not to be detached from the processing liquid drying processing drum 46 (transport path).
  • the processing liquid drying processing unit 50 is installed inside the processing liquid drying processing drum 46 and is configured to perform drying processing by blowing dry air toward the surface of the recording medium P conveyed by the processing liquid drying processing drum 46. ing. Thereby, the solvent component in the processing liquid is removed, and an ink aggregation layer is formed on the surface of the recording medium P.
  • the two processing liquid drying processing units 50 are arranged in the processing liquid drying processing drum, and the drying air is directed toward the surface of the recording medium P conveyed by the processing liquid drying processing drum 46. It is configured to spray.
  • photocurable ink is used as the ink ejected from each of the inkjet heads 56M, 56K, 56C, and 56Y.
  • the photocurable ink is cured and dried by irradiating light (in this case, ultraviolet rays) with an ink fixing unit described later after ejection.
  • the image recording drum 52 is configured to receive the recording medium P from the processing liquid drying processing drum 46 of the processing liquid drying processing section 16 and to transport the recording medium P to the ink fixing processing section 20.
  • the image recording drum 52 is formed in a cylindrical shape, is connected to a motor (not shown), and is driven by the rotation of this motor.
  • a gripper 52A is provided on the outer peripheral surface of the image recording drum 52, and the leading end of the recording medium P is gripped by the gripper 52A.
  • the image recording drum 52 conveys the recording medium P to the ink fixing processing unit 20 while winding the recording medium P around the peripheral surface by gripping and rotating the tip of the recording medium P with the gripper 52A.
  • suction holes suction holes
  • suction holes are provided in a predetermined pattern on the peripheral surface of the image recording drum 52.
  • the recording medium P wound around the peripheral surface of the image recording drum 52 is sucked through the suction hole, so that it can be conveyed while being sucked and held on the peripheral surface of the image recording drum 52. Thereby, the recording medium P can be conveyed with high smoothness.
  • the suction from the suction hole is performed only within a certain range, and the recording medium P is sucked between a predetermined suction start position and a predetermined suction end position.
  • the suction start position is set to the installation position of the recording medium pressing roller 54.
  • the suction end position is set on the downstream side of the installation position of the inline sensor 58, and is set to a position where the recording medium P is delivered to the ink fixing processing unit 20, for example. That is, at least at the installation position (image recording position) of the inkjet heads 56M, 56K, 56C, and 56Y and the installation position (image reading position) of the inline sensor 58, the recording medium P is attracted and held on the peripheral surface of the image recording drum 52.
  • the adsorption method is not limited to the adsorption method using negative pressure, and may be an adsorption method using electrostatic adsorption.
  • the image recording drum 52 in the present embodiment is provided with grippers 52A at two positions on the outer peripheral surface, so that two recording media P can be conveyed by one rotation.
  • the rotation of the image recording drum 52 and the processing liquid drying processing drum 46 is controlled by matching the timings of receiving and delivering both recording media P. That is, the image recording drum 52 and the processing liquid drying processing drum 46 are driven with the peripheral speeds matched, and are driven with the positions of the grippers 46A and the grippers 52A matched.
  • the four inkjet heads 56M, 56K, 56C, and 56Y are arranged on the outer peripheral surface of the image recording drum 52 along the conveyance path of the recording medium P at a constant interval.
  • Each of the inkjet heads 56M, 56K, 56C, and 56Y is configured by a line head corresponding to the recording medium width, and the ejection nozzle surface is disposed to face the peripheral surface of the image recording drum 52.
  • Each of the inkjet heads 56M, 56K, 56C, and 56Y causes the image recording drum 52 to eject light-curable ink droplets from a plurality of ejection openings formed on the ejection nozzle surface toward the image recording drum 52. An image is recorded on the recording medium P being conveyed.
  • the in-line sensor 58 is installed on the downstream side of the rearmost inkjet head 56Y in the conveyance direction of the recording medium P by the image recording drum 52, and is recorded by the inkjet heads 56M, 56K, 56C, and 56Y. It is configured to read an image.
  • the inline sensor 58 is constituted by a line scanner, for example.
  • a contact prevention plate 59 installed in the vicinity of the inline sensor 58 is provided on the downstream side of the inline sensor 58.
  • the contact prevention plate 59 can prevent the recording medium P from coming into contact with the in-line sensor 58 when the recording medium P is lifted or broken due to a conveyance failure or the like.
  • the mist filter 60 is disposed between the rearmost inkjet head 56Y and the inline sensor 58, and sucks the air around the image recording drum 52 to capture the ink mist. By capturing the ink mist, the ink mist is prevented from entering the in-line sensor 58, and the occurrence of image reading defects and the like is effectively prevented.
  • the drum cooling unit 62 is configured to cool the image recording drum 52 by blowing cool air to the image recording drum 52.
  • the drum cooling unit 62 is mainly composed of an air conditioner (not shown) and a duct 62 ⁇ / b> A that blows cool air supplied from the air conditioner onto the peripheral surface of the image recording drum 52.
  • the duct 62 ⁇ / b> A is configured to cool the image recording drum 52 by blowing cool air to the image recording drum 52 in an area other than the conveyance area of the recording medium P.
  • the duct 62A cools the region of the lower half of the image recording drum 52.
  • the image recording drum 52 is cooled by spraying.
  • the air outlets (not shown) of the duct 62 ⁇ / b> A are arranged in an arc shape so as to cover substantially the lower half of the image recording drum 52.
  • the ink fixing processing unit 20 is configured to remove the liquid component remaining on the image recording surface of the recording medium P and to post-process the recording medium P after image recording.
  • the ink fixing processing unit 20 mainly includes a chain gripper 64 that transports a recording medium P on which an image is recorded, a back tension applying mechanism 66 that applies back tension to the recording medium P transported by the chain gripper 64, and a chain gripper. 64, a drying processing unit 21 and a light irradiation unit 22 are provided as ink fixing means for fixing the recording medium P conveyed.
  • the chain gripper 64 is a medium transport mechanism as a part of transport means used in common in the drying processing unit 21, the light irradiation unit 22, and the paper discharge unit 24, and the recording medium delivered from the image recording unit 18. It is configured to receive P and transport it to the paper discharge unit 24.
  • the chain gripper 64 mainly includes a first sprocket 64A installed close to the image recording drum 52 side, a second sprocket 64B installed on the paper discharge unit 24 side, and the first sprocket 64A and the second sprocket 64B.
  • a chain 64C as an endless conveyance path wound around the chain, a plurality of chain guides (not shown) for guiding the travel of the chain 64C, and a plurality of grippers 64D attached to the chain 64C at a constant interval. It is configured.
  • the first sprocket 64A, the second sprocket 64B, the chain 64C, and the chain guide are configured as a pair on both sides in the conveyance width direction of the recording medium P.
  • the grippers 64D are provided on the pair of chains 64C, respectively.
  • the first sprocket 64A is connected to a motor (not shown) and is driven by the rotation of this motor.
  • the second sprocket 64B is dependently rotatable.
  • the back tension applying mechanism 66 is configured to apply a back tension to the recording medium P that is conveyed while its tip is held by the chain gripper 64.
  • the back tension applying mechanism 66 is not shown in detail, but mainly includes a guide plate 72 and a plurality of suction fans 70A as suction means for sucking air from a number of suction holes formed in the guide plate 72. It is equipped with.
  • the lower surface of the guide plate 72 is provided with a number of holes for discharging the sucked air.
  • back tension is applied by being sucked by the suction fan 70 ⁇ / b> A through the suction hole of the guide plate 72.
  • the drying processing unit 21 is provided on the upstream side in the transport direction of the chain gripper 64 and inside the chain gripper 64, and is arranged along the transport direction. It has.
  • the drying processing unit 68 is configured to blow dry air (for example, hot air) on the image recording surface of the recording medium P.
  • dry air for example, hot air
  • the drying air is blown by the drying processing unit 68, the amount of water in the photocurable ink is reduced before the light (ultraviolet ray) is irradiated by the light irradiation unit 22. Thereby, the curability of the photocurable ink is secured by the subsequent light irradiation.
  • the light irradiation unit 22 is configured to irradiate an image recorded using a photocurable ink with ultraviolet rays (UV) as light in this embodiment to fix the image.
  • the light irradiation unit 22 mainly includes a chain gripper 64 that conveys the recording medium P, a back tension applying mechanism 66 that applies a back tension to the recording medium P and serves as a suction unit, and an irradiation unit that irradiates the recording medium P with light. 74.
  • the irradiation unit 74 is provided downstream of the drying processing unit 21 in the transport direction of the chain gripper 64 and inside the chain gripper 64, and a plurality of the irradiation units 74 are arranged along the transport direction.
  • the irradiation unit 74 includes an ultraviolet lamp as a light source (not shown).
  • the back tension applying mechanism 66 mainly includes a guide plate 72 and a plurality of suction fans 70B as suction means for sucking air from a number of suction holes formed in the guide plate 72.
  • the lower surface of the guide plate 72 is provided with a number of holes for discharging the sucked air.
  • the chain gripper 64 In the recording medium P conveyed by the chain gripper 64, back tension is applied by being sucked by the suction fan 70B through the suction hole of the guide plate 72.
  • the height of the paper discharge unit 24 arranged on the downstream side in the transport direction is higher than that of the drying processing unit 21, so that the chain gripper 64, the guide plate 72, and the like are adjusted in order to adjust the transport position. These components are inclined upward from below.
  • the paper discharge unit 24 is configured to collect the recording medium P that has undergone a series of image recording processes.
  • the paper discharge unit 24 mainly includes a chain gripper 64 that transports the recording medium P on which the photocurable ink is fixed by light irradiation, and a paper discharge tray 76 that stacks and collects the recording medium P. .
  • the paper discharge tray 76 is provided with paper pads (front paper pads, rear paper pads, horizontal paper pads, etc.) for orderly stacking the recording media P.
  • a discharge tray lifting device (not shown) is provided on the discharge tray 76 so that the recording medium P can be lifted.
  • the elevation drive is controlled in conjunction with the increase / decrease of the recording media P collected on the paper delivery platform 76, so that the topmost recording media P is always positioned at a certain height. Has been adjusted to.
  • an aqueous ultraviolet ink that is cured by irradiation with ultraviolet rays as light is used.
  • the aqueous ultraviolet ink preferably contains a pigment, polymer particles, a water-soluble polymerizable compound that is polymerized by active energy rays, and a photopolymerization initiator.
  • the coloring material may include a dye.
  • the ink supply system 100 mainly includes an ink tank 102, an ink pressure control tank 108, a common flow path 124, and an individual flow path 134. It is configured.
  • the ink tank 102 is a main tank in which photocurable ink is stored. Further, the ink tank 102 is capable of circulating photocurable ink between the ink pressure control tank 108 and a supply pipe 106 provided with an ink pump 104 as a liquid pressure control means.
  • the ink pressure control tank 108 has a two-chamber structure in which the inside is partitioned by an elastic film 110 that alleviates pressure fluctuations.
  • the lower space is an ink chamber 108A and the upper space is a gas chamber 108B.
  • a supply pipe 106 communicating with the ink tank 102 and a supply pipe 112 communicating with the common flow path 124 are connected to the ink chamber 108A.
  • a communication passage 116 that connects the gas chamber 108B and the air tank (gas tank) 114 is connected to the gas chamber 108B serving as a damper that relieves pressure fluctuation of the ink in the ink chamber 108A.
  • the air tank 114 is connected to a communication path 118 that communicates the air tank 114 with the atmosphere.
  • the communication passages 116 and 118 are provided with opening / closing valves 120 and 122 for controlling the opening and closing of the communication passages 116 and 118, respectively.
  • the common channel 124 is a hollow cylindrical member, and has a two-chamber structure in which the inside is partitioned in parallel in the longitudinal direction by an elastic membrane (elastic member) 126 as a damper that relieves pressure fluctuation.
  • an elastic membrane elastic member
  • the lower space is an ink flow path 124A through which photocurable ink flows, and the upper space narrower than the lower space is a gas chamber 124B.
  • a supply pipe 112 is connected to an upstream end that is one longitudinal end of the ink flow path 124A.
  • an ink pressure sensor 128 that detects the pressure of the photocurable ink flowing in the ink flow path 124A is provided at the downstream end that is the other end in the longitudinal direction.
  • a bubble vent channel 130 that connects the ink channel 124A and the ink tank 102 is connected to the downstream end of the ink channel 124A.
  • the bubble vent channel 130 is provided with an open / close valve 132 that controls opening / closing of the bubble vent channel 130.
  • a plurality of individual channels 134 are connected in parallel to the lower surface of the ink channel 124A facing the gas chamber 124B.
  • Each individual flow path 134 is provided with an open / close valve 136 that controls opening / closing of the individual flow path 134.
  • the inkjet head 56 includes a plurality of head modules 138 arranged in parallel, and each individual flow path 134 is connected to each head module 138.
  • a communication passage 142 that connects the gas chamber 124B and the air tank 140 is connected to the gas chamber 124B serving as a damper that relieves the pressure fluctuation of the ink in the ink flow path 124A.
  • the air tank 140 is connected to a communication path 144 that allows the air tank 140 to communicate with the atmosphere.
  • the communication path 144 is provided with an opening / closing valve 146 that serves as an opening / closing control means for controlling the opening / closing of the communication path 144. .
  • the gas chamber 124 ⁇ / b> B can hold and discharge the internal gas by the communication path 142 and the opening / closing valve 146 as gas holding means.
  • the ink pump 104 is operated to supply the photocurable ink stored in the ink tank 102 to the ink flow path 124A of the common flow path 124 through the ink chamber 108A of the ink pressure control tank 108.
  • the ink pressure in the ink flow path 124A is increased to a predetermined pressure P1 by the ink pump 104, and the elastic film 126 is pushed up by the ink pressure as shown in FIG.
  • the predetermined pressure P1 is determined by the ink supply pressure during printing and the capacities of the gas chamber 124B and the air tank 140.
  • the open / close valve 146 of the communication path 144 shown in FIG. 2A is closed, and the ink pressure in the ink flow path 124A is reduced to the printing pressure P2 lower than the predetermined pressure P1 by the ink pump 104.
  • the printing pressure P2 is a negative pressure.
  • the open / close valve 136 of the individual flow path 134 is opened to supply photocurable ink to each head module 138.
  • the open / close valve 146 of the communication path 144 is opened. Thereafter, the ink pump 104 is operated to supply the photocurable ink stored in the ink tank 102 to the ink flow path 124 ⁇ / b> A of the common flow path 124 through the ink chamber 108 ⁇ / b> A of the ink pressure control tank 108.
  • the ink pressure in the ink flow path 124A is increased by the ink pump 104 to the purge pressure P3 at which bubbles and thickened photocurable ink can be discharged, and the elastic film 126 is pushed up by the ink pressure. Since the purge pressure P3 is higher than the predetermined pressure P1 and the printing pressure P2, the elastic film 126 is pushed up and pressed against the inner wall of the gas chamber 124B as shown in FIG.
  • the elastic membrane 126 is held in a state of being pressed against the inner wall of the gas chamber 124B.
  • the opening / closing valve 136 of the individual flow path 134 is opened, and the ink pump 104 applies the photocurable ink to each head module 138. Supply.
  • the open / close valve 146 of the communication path 144 is opened. Thereafter, the ink pump 104 is operated to return the photocurable ink in the ink flow path 124 ⁇ / b> A to the ink tank 102 through the ink chamber 108 ⁇ / b> A of the ink pressure control tank 108.
  • the ink pressure in the ink flow path 124A is reduced to the negative pressure P4 by the ink pump 104, and the elastic film 126 is pulled down as shown in FIG. Thereafter, when the on-off valve 146 of the communication path 144 shown in FIG. 2A is closed, the elastic membrane 126 is held in a lowered state.
  • the ink pump 104 After adjusting the pressure of the gas inside the gas chamber 124B, the ink pump 104 is stopped, the open / close valve 136 of the individual flow path 134 is opened, and the photocurable ink is supplied to each head module 138. Then, as shown in FIG. 5C, the elastic film 126 is pulled down by the pressure difference between the gas pressure inside the gas chamber 124B and the ink pressure, and the gas pressure inside the gas chamber 124B is changed from the purge pressure P3. Decrease to atmospheric pressure.
  • the ink pump 104 is operated to return the photocurable ink in the ink flow path 124A to the ink tank 102 through the ink chamber 108A of the ink pressure control tank 108.
  • the ink pressure in the ink flow path 124A is reduced to a negative pressure P4 by the ink pump 104, and the elastic film 126 is pulled down as shown in FIG. Thereafter, when the on-off valve 146 of the communication path 144 shown in FIG. 2A is closed, the elastic membrane 126 is held in a lowered state.
  • the open / close valve 132 of the bubble vent channel 130 is opened, and the ink pump 104 supplies a constant flow rate of photocurable ink to the ink channel 124A.
  • the cross-sectional area of the ink flow path 124A is decreased to increase the flow rate of the photocurable ink in the ink flow path 124A, thereby causing the bubbles in the ink flow path 124A to pass through the bubble removal flow path 130. It becomes easy to discharge to the ink tank 102.
  • the elastic film 126 swells toward the ink flow path 124A, so that the individual flow paths 134 are The resulting pressure fluctuation can be mitigated.
  • the elastic film 126 swells toward the gas chamber 124B, thereby causing the pressure fluctuation generated in each individual flow path 134. Can be relaxed.
  • the pressure fluctuation generated in the flow direction of the photocurable ink in the individual flow path 134 during printing can be directly mitigated by the gas chamber 124B and the elastic film 126 provided in the pressure fluctuation direction.
  • the gas chamber 124B is provided at a position facing each individual flow path 134, uniform damper performance can be obtained in all the head modules 138.
  • the pressure of the gas inside the gas chamber 124B is indirectly controlled by opening and closing the open / close valve 146 of the communication path 144 and adjusting the ink pressure in the ink flow path 124A by the ink pump 104, thereby elastic film.
  • the holding position 126 is adjusted.
  • the pressure fluctuation of the photocurable ink can be reduced by using the elasticity of the elastic film 126 and the pressure of the gas inside the gas chamber 124B. Therefore, since it does not depend only on the elasticity of the elastic film 126, it is possible to obtain a higher damper performance than when the gas chamber 124B is open to the atmosphere. Further, a gas pump or a pressure sensor that directly adjusts the pressure of the gas inside the gas chamber 124B is unnecessary, and the pressure of the gas inside the gas chamber 124B can be adjusted by an inexpensive method.
  • the elastic membrane 126 is held in a state of being pressed against the inner wall of the gas chamber 124B. For this reason, compared with the time of printing, the degree of relaxation of the pressure fluctuation of the photocurable ink by the gas chamber 124B becomes lower. Therefore, since the pressurized photocurable ink is discharged from the ejection port of the head module 138 with almost no pressure absorbed by the gas chamber 124B, the pressurized maintenance can be performed efficiently.
  • the elastic film 126 is held in a lowered state, and the cross-sectional area of the ink flow path 124A is narrowed.
  • the degree of relaxation of the pressure fluctuation of the photocurable ink by the gas chamber 124B is lower than at the time of printing, and the flow rate of the photocurable ink is low even at a low flow rate. Will be faster. For this reason, the driving force of the ink pump 104 can be reduced, and the ink pump 104 can be reduced in size.
  • the ink supply system 150 of this embodiment has a gas as a gas pressure control means for controlling the pressure of the gas inside the gas chamber 124B.
  • a pump 152 is provided.
  • a communication path 154 that connects the air tank 140 and the gas pump 152 is connected to the air tank 140 that is connected to the gas chamber 124 ⁇ / b> B by the communication path 142.
  • the communication path 154 is provided with an opening / closing valve 156 for controlling the opening / closing of the communication path 154, and the air tank 140 is provided with a gas pressure sensor 158 for detecting the pressure of the gas in the air tank 140. .
  • the gas inside the gas chamber 124B is decompressed by the gas pump 152, and the elastic film 126 is formed as shown in FIG.
  • the gas chamber 124B is held while being pressed against the inner wall.
  • the opening / closing valve 136 of the individual flow path 134 is opened, and the ink pump 104 is driven to supply photocurable ink to each head module 138.
  • the gas inside the gas chamber 124B is pressurized by the gas pump 152, and the elastic film 126 is pushed down as shown in FIG. 8C. Hold in the state.
  • the open / close valve 132 of the bubble vent channel 130 is opened, and the ink pump 104 supplies photocurable ink at a constant flow rate to the ink channel 124A.
  • the bubbles are discharged to the ink tank 102.
  • an ink circulation channel 166 as a liquid circulation channel is formed by the common supply channel 162 and the common recovery channel 164.
  • each head module 138 is provided with an input port 138A through which photocurable ink flows and an output port 138B through which photocurable ink is discharged.
  • An individual supply channel 168 connected to the common supply channel 162 is connected to the input port 138A, and an individual recovery channel 170 connected to the common recovery channel 164 is connected to the output port 138B.
  • the individual supply channel 168 is provided with an opening / closing valve 172 that controls the opening and closing of the individual supply channel 168 and a damper 174 that relieves pressure fluctuation of the photocurable ink supplied from the common supply channel 162.
  • the individual recovery channel 170 is provided with an opening / closing valve 176 that controls the opening and closing of the individual recovery channel 170 and a damper 178 that relieves pressure fluctuation of the photocurable ink recovered to the common recovery channel 164. Yes.
  • a supply pipe 180 is connected to an upstream end that is one longitudinal end of the common supply flow path 162, and a supply pipe 182 is connected to a downstream end that is one longitudinal end of the common recovery flow path 164. Are connected. Between the downstream end that is the other end in the longitudinal direction of the common supply channel 162 and the upstream end that is the other end in the longitudinal direction of the common recovery channel 164, the first channel 184 and A second flow path 186 is provided.
  • the first flow path 184 is provided with a first valve 192
  • the second flow path 186 is provided with a second valve 194 and a damper 195.
  • the first flow path 184 and the second flow path 186 are used for adjusting the pressure between the common supply flow path 162 and the common recovery flow path 164, adjusting the flow rate of the photocurable ink, and the like.
  • ink pressure sensors 188 and 190 for detecting the pressure of the photocurable ink are provided at the downstream end of the common supply channel 162 and the upstream end of the common recovery channel 164, respectively.
  • the supply sub tank 196 has the same configuration as the ink pressure control tank 108 in the first embodiment.
  • the supply sub-tank 196 is connected to a supply-side main pipe 200 for drawing light curable ink from a buffer tank 198 connected to the ink tank 102.
  • the supply side main pipe 200 is provided with a deaeration module 202, a one-way valve 204, a supply pump 206 as a liquid pressure control means, a supply side filter 208, and a heat exchanger 210 in order from the buffer tank 198 to the supply sub tank 196. It has been.
  • the deaeration module 202 includes, for example, a two-layered cylinder (not shown), and this cylinder is formed of a film that allows only gas molecules to pass through.
  • a vacuum pump (not shown) having a negative pressure changing function is connected to the deaeration module 202, and when the vacuum pump is operated, pressure reduction is performed in the deaeration module 202, and a photo-curing type. Degas from the ink.
  • One end of the branch pipe 212 is connected to the upstream side of the supply pump 206 separately from the supply side main pipe 200, and the other end of the branch pipe 212 is connected to the buffer tank 198 through the one-way valve 214.
  • One end of a drain pipe 216 is connected to the supply sub tank 196, and the other end of the drain pipe 216 is connected to a buffer tank 198.
  • the drain pipe 216 is provided with a drain valve 218.
  • the supply sub tank 196 has a structure in which air bubbles in the flow path are trapped by circulating photocurable ink. For this reason, by opening the drain valve 218 and sending the bubbles in the supply sub tank 196 to the buffer tank 198 by the driving force of the supply pump 206, the bubbles are discharged from the buffer tank 198 opened to the atmosphere. .
  • the other end of the supply pipe 182 connected to the common recovery channel 164 is connected to the recovery sub tank 220.
  • the collection sub tank 220 has the same configuration as the ink pressure control tank 108 in the first embodiment.
  • a recovery side main pipe 222 for drawing the photocurable ink into the buffer tank 198 is connected to the recovery sub tank 220.
  • the recovery side main pipe 222 is provided with a recovery pump 224 as a liquid pressure control means and a one-way valve 225, and a downstream side of the recovery pump 224 and a downstream side of the deaeration module 202 in the supply side main pipe 200 are provided.
  • a pressure purge pipe 226 is provided therebetween.
  • a one-way valve 228 and a recovery filter 230 are provided in order from the degassing module 202 side to the recovery pump 224 side in the pressure purge pipe 226.
  • photocurable ink can be circulated between the buffer tank 198 and the ink tank 102 by a replenishment pipe 234 provided with a replenishment pump 232. Further, the buffer tank 198 stores an amount of ink necessary for circulating the photocurable ink, and the photocurable ink is replenished from the ink tank 102 according to consumption of the photocurable ink. It has become.
  • a filter 236 is provided at one end of the replenishment pipe 234 (in the ink tank 102).
  • An overflow pipe 238 is provided between the buffer tank 198 and the ink tank 102 so that the photocurable ink is returned to the ink tank 102 when the photocurable ink is replenished excessively.
  • branch pipe 240 One end of the branch pipe 240 is connected to the upstream side of the recovery pump 224 in the recovery side main pipe 222, and the other end of the branch pipe 240 is connected to the overflow pipe 238.
  • the branch pipe 240 is provided with a safety valve 242.
  • drain pipe 244 is connected to the recovery sub tank 220, and the other end of the drain pipe 244 is connected to the drain pipe 216 through the drain valve 246.
  • the recovery sub-tank 220 has a structure in which bubbles in the flow path are trapped by circulating photocurable ink. Therefore, by opening the drain valve 246 and sending the bubbles in the collection sub tank 220 to the buffer tank 198 by the driving force of the collection pump 224, the bubbles are discharged from the buffer tank 198.
  • branch pipe 248 is connected between the supply side filter 208 and the heat exchanger 210 in the supply side main pipe 200, and the other end of the branch pipe 248 is connected to the overflow pipe 238.
  • a branch valve 248 is provided with a safety valve 250.
  • the common supply channel 162 and the common recovery channel 164 are each formed in the longitudinal direction by elastic films 252 and 254 having elasticity, like the common channel 124 of the first embodiment. It has a two-chamber structure that is partitioned in parallel with each other. Of the spaces partitioned into the two chambers, the lower spaces are ink flow paths 162A and 164A through which photocurable ink flows, and the upper spaces narrower than the lower spaces are gas chambers 162B and 164B. ing.
  • the gas chambers 162B and 164B are connected to communication passages 260 and 262 that connect the gas chambers 162B and 164B and the air tanks 256 and 258, respectively.
  • the air tanks 256 and 258 are connected to the air tanks 256 and 258 and the atmosphere.
  • the passages 264 and 266 are connected to each other.
  • the communication passages 264 and 266 are provided with opening and closing valves 268 and 270 for controlling the opening and closing of the communication passages 264 and 266, respectively. Note that the capacity of the air tank 256 connected to the common supply flow path 162 is larger than the capacity of the air tank 258 connected to the common recovery flow path 164.
  • the ink pressure P5 in the ink flow path 162A of the common supply flow path 162 is set to a positive pressure
  • the ink pressure P6 in the ink flow path 164A is set to a negative pressure.
  • the photocurable ink supplied to the common supply channel 162 is supplied to each head module 138 by the ink pressure P5 higher than the ink pressure P6, and the photocurable ink supplied to the head module 138 is supplied to the ink pressure P6.
  • the head module 138 collects the head module 138 to the common recovery channel 164.
  • the head module 138 an ink pressure corresponding to the flow resistance ratio between the common supply flow channel 162 and the common recovery flow channel 164 is applied, but the ink pressure P5 and the ink pressure P By setting the ink pressure P6, the photocurable ink is held in the ejection port of the head module 138. By doing so, it is possible to record an image on the recording medium P by ejecting droplets of photocurable ink from the inkjet head 56 during printing.
  • the gas pressure inside the gas chamber 162B of the common supply channel 162 is adjusted to be equal to the ink pressure P5 in the ink channel 162A. Therefore, the elastic membrane 252 is held in the common supply channel 162 in a state where no tension is applied.
  • the pressure of the gas inside the gas chamber 164B of the common recovery channel 164 is adjusted to be equal to the ink pressure P6 in the ink channel 164A. Therefore, the elastic membrane 254 is held in the common recovery flow path 164 in a state where no tension is applied.
  • the present invention can be applied to the ink circulation channel 166 by providing the gas chambers 162B and 164B in both the common supply channel 162 and the common recovery channel 164, respectively. it can. For this reason, the pressure fluctuations of the photocurable ink in the ink circulation channel 166 can be reduced by the gas chambers 162B and 164B.
  • the gas pressure (P5) inside the gas chamber 162B of the common supply channel 162 is set higher than the gas pressure (P6) inside the gas chamber 164B of the common recovery channel 164. Yes. Thereby, even when the ink pressures of the common supply channel 162 and the common recovery channel 164 are different, good pressure fluctuation mitigation performance can be obtained.
  • the capacity of the air tank 256 connected to the common supply channel 162 is common recovery.
  • the capacity of the air tank 258 connected to the flow path 164 is increased. Accordingly, even if the sizes and configurations of the gas chambers 162B and 164B in the common supply channel 162 and the common recovery channel 164 are the same, the ink pressure in the common supply channel 162 is changed to the ink pressure in the common recovery channel 164. In a higher state, the pressure of the gas inside the gas chambers 162B and 164B and the ink pressure can be balanced. That is, the elastic films 252 and 254 can be held in a state where no tension is applied.
  • one common flow path 274 is configured by connecting a plurality (three in FIG. 11) of common flow path constituting members 272 in series.
  • a fitting portion 276 is formed at one end in the longitudinal direction of the common flow path constituting member 272, and a fitted portion 278 is formed at the other end, and another common flow path is formed in the fitted portion 278 of the common flow passage constituting member 272.
  • the fitting portions 276 of the constituent members 272 are connected.
  • a plurality (three in FIG. 11) of common flow path constituting members 272 are provided with independent gas chambers 280, respectively.
  • the upper part of the common flow path component member 272 is notched, and another member having an elastic film 282 bonded to the lower surface is fitted into the notched portion of the common flow path component member 272 as shown in FIG.
  • the gas chamber 280 is provided in the common flow path component 272 by being integrated by ultrasonic fusion.
  • communication passages 284 are connected to the upper part of the gas chamber 280 in the direction orthogonal to the connection direction of the common flow path component 272, respectively. As shown in FIG. 11, each communication passage 284 is connected to a common air tank 286, and a communication passage 288 that connects the air tank 286 and the atmosphere is connected to the air tank 286.
  • the communication passage 288 is provided with an opening / closing valve 290 that controls opening / closing of the communication passage 288.
  • a bubble vent channel 294 is connected to the downstream end portion of the common channel constituent member 272 arranged on the most downstream side.
  • the pressure of the gas in the gas chamber 280 is adjusted and the elastic film 282 is held in a lowered state, and photocuring is performed.
  • the mold ink is supplied to the common channel 274 and the bubbles in the common channel 274 are discharged to the bubble removal channel 130.
  • some of the bubbles accumulate between the elastic films 282 swelled toward the individual flow path 292 (downward), that is, at the connection portion of the common flow path constituting member 272.
  • the on-off valve 290 shown in FIG. 11 is opened, the pressure of the gas in the gas chamber 280 is adjusted to push up the elastic membrane 282, and then the on-off valve 290 is closed, as shown in FIG. Hold 282 in a pushed-up state. By doing so, some of the bubbles that have accumulated between the elastic films 282 and joined together are discharged to the bubble vent channel 130.
  • the above procedure is periodically repeated a plurality of times as necessary to discharge the bubbles in the common channel 274 to the bubble vent channel 130.
  • the common flow path 274 is comprised by connecting the some common flow path structural member 272 in series. For this reason, it can respond also to the apparatus from which the number of head modules connected differs.
  • Each common flow path component 272 is provided with a gas chamber 280, and a communication path 284 connected to each gas chamber 280 is provided in a direction orthogonal to the connection direction of the common flow path component 272. . For this reason, it becomes easy to adjust the pressure of the gas inside each gas chamber 280 uniformly.
  • the elastic film 282 is moved up and down to discharge the bubbles in the common channel 274 to the bubble removal channel 130.
  • a thick part 298 is provided on the inner wall of the upper part of the common flow path 296, and the width of the gas chamber 296B partitioned by the elastic film 300 is made narrower than the width of the ink flow path 296A. May be.
  • the elastic film 300 when the elastic film 300 is held at the position indicated by the two-dot chain line in FIG. 14A when the bubbles are discharged, the elastic film is compared with when the bubbles are discharged in the common flow path 124 of the first embodiment. It is difficult for air bubbles to accumulate between 300 and the inner wall of the common flow path 296. For this reason, the photocurable ink can be distributed without stagnation in the ink flow path 296A, and the bubbles can be efficiently discharged.
  • the mounting position of the elastic film 304 in the common flow path 302 is located above the mounting position of the elastic film 126 of the first embodiment, and the elastic film 304 is swelled upward. May be.
  • the elastic membrane 304 when the elastic membrane 304 is held at the position indicated by the two-dot chain line in FIG. 14B when the bubbles are discharged, the elastic membrane is compared with when the bubbles are discharged in the common flow path 124 of the first embodiment. Air bubbles hardly accumulate between 304 and the inner wall of the common flow path 302. For this reason, the photocurable ink can be distributed without stagnation in the ink flow path 302A, and bubbles can be efficiently discharged.
  • the first to fourth embodiments can be appropriately combined.
  • the pressure of the gas inside the gas chambers 162B, 164B, and 280 may be controlled by a gas pump.

Landscapes

  • Ink Jet (AREA)

Abstract

L'invention concerne un système d'alimentation en liquide, dans lequel des performances d'amortisseur uniformes peuvent être obtenues dans la totalité des modules d'une pluralité de modules de tête. Un système (100) d'alimentation en liquide est doté des éléments suivants : un canal commun (124) ayant des canaux individuels (134) respectivement en communication avec chaque module d'une pluralité de modules de tête (138) reliés à ceux-ci en parallèle, le canal commun (124) fournissant un liquide aux modules de tête (138) ou récupérant un liquide depuis ceux-ci ; et une chambre de gaz (124B) prévue au niveau d'une position parallèle au canal commun (124) et opposée aux canaux individuels (134) en séparant l'intérieur du canal commun (124) à l'aide d'un élément élastique (126).
PCT/JP2015/073977 2014-09-19 2015-08-26 Système d'alimentation en liquide WO2016042993A1 (fr)

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JP2016548797A JP6072380B2 (ja) 2014-09-19 2015-08-26 液体供給システム
DE112015004254.7T DE112015004254B4 (de) 2014-09-19 2015-08-26 Flüssigkeitszuführsystem

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DE112015004254B4 (de) 2019-09-19

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