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WO1989001067A1 - Machine a coudre a dispositif de transport superieur - Google Patents

Machine a coudre a dispositif de transport superieur Download PDF

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Publication number
WO1989001067A1
WO1989001067A1 PCT/EP1988/000414 EP8800414W WO8901067A1 WO 1989001067 A1 WO1989001067 A1 WO 1989001067A1 EP 8800414 W EP8800414 W EP 8800414W WO 8901067 A1 WO8901067 A1 WO 8901067A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
foot
sewing machine
connection
sewing
Prior art date
Application number
PCT/EP1988/000414
Other languages
German (de)
English (en)
Inventor
Kurt Klundt
Original Assignee
Pfaff Industriemaschinen Gmbh
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 Pfaff Industriemaschinen Gmbh filed Critical Pfaff Industriemaschinen Gmbh
Priority to KR1019890700514A priority Critical patent/KR890701824A/ko
Priority to DE8888904400T priority patent/DE3870244D1/de
Publication of WO1989001067A1 publication Critical patent/WO1989001067A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/04—Work-feeding means with feed dogs having horizontal and vertical movements arranged above the workpieces

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • the stroke of the presser system can only be adjusted by the operator while the sewing machine is at a standstill.
  • the stroke is usually set according to the thickest part of the sewing material to be sewn over so that no difficulties arise during sewing.
  • the larger the stroke the greater the tendency of the feed and presser elements to vibrate at higher sewing speeds. In addition to other undesirable effects, they can temporarily lose contact with the sewing material, which means that even transport in the selected stitch length is no longer guaranteed.
  • the presser bar which is under the pressure of the presser spring, is supported on an adjustable stop.
  • the presser feet, d. H. the presser foot and the upper feed foot have only a low mass inertia and are cushioned separately from the presser system so that at least one presser foot always has sufficient contact with the material.
  • a stroke regulation is known from the older DE-OS 35 28 295, in which a sensing element acting directly in front of the sewing point is provided, which senses the height difference and influences the control of the lifting drive with the sensed values.
  • the size of the stroke is adjusted accordingly and then reduced again to the original size. Due to the change in height of the support element carrying the sewing feet, the entire spring forces are also influenced. As the suspension ratios change, the sewing properties also change.
  • the invention has for its object to provide a height adjustment of the presser system for the presser foot and the upper feed foot which adapts to the respective thickness ratios of the sewing material.
  • the measure according to claim 2 enables the reaction forces acting on the sewing feet during the sewing process to be used as a controlled variable. Appropriate training of the controller to avoid excessive control fluctuations is achieved by the application according to claims 3 to 5.
  • the measures according to claims 6 to 9 are used to advantageously adapt the control system to differently designed upper transport systems. Claims 6 and 7 relate to an upper transport system in which the upper transport foot rests on the material during its entire drive phase, while claims 8 and 9 relate to an upper transport drive with an alternating lifting drive for the upper transport foot and the presser foot.
  • Fig. 1 is a side view of a sewing machine with a
  • Fig. 2 is a diagrammatic representation of the
  • Fig. 3 is an enlarged sectional view of the
  • Fig. 4 is an enlarged view of the
  • Fig. 5 is a side view, partly in section, of the parts shown in Fig. 4;
  • Fig. 6 is a side view of the sewing machine with another embodiment of the
  • Fig. 7 is a diagrammatic representation of the
  • Fig. 8 is an enlarged sectional view of the
  • Fig. 9 is an enlarged section of the level control shown in Fig. 8 with a modified version of the guide bushing and
  • Fig. 10 is a section along the line XX of Fig. 9 and 11 shows a section through a further modified embodiment of the level control according to FIG. 8.
  • Fig. 1 shows a side view of a sewing machine, in the housing of a presser bar (2) carrying a presser foot (1) and a needle bar (4) mounted in a needle bar carrier (3), the thread-guiding needle (5) of which is shown with a gripper (not shown) works together.
  • the sewing machine has an upper feed foot (6) which interacts with a lower fabric pusher, not shown.
  • a main shaft (7) (FIG. 2) which is driven in a known manner and which drives the needle bar (4) via a crank (8) and a link (9) is also mounted in the housing of the sewing machine.
  • the handlebar (9) is mounted on a pin (10) fastened in the crank (8).
  • actuating piston (22) attached, which is part of a gear connection (23).
  • a handlebar (28) (Fig. 1) is pivotally mounted, the other end of which is articulated to a support (29) for the upper feed foot (6).
  • the support element (20) also carries a pin (30) on which a telescopic rod (31) is mounted, which is also connected to the carrier (29) via a joint pin (32).
  • the upper feed foot (6) is driven by a stitch actuator (40) (FIG. 2) which is connected to an eccentric (41) attached to the main shaft (7).
  • the stitch regulator (40) has an adjusting shaft (42) mounted in the housing, which is fixedly connected to a bracket (43), between which its arms e are rotatably supported in a further bracket (44) by means of pins (45).
  • the arms of the bracket (44) are connected by a bolt (46) to which an eccentric rod (47) is articulated.
  • the eccentric (41) which is enclosed by the eccentric rod (47), gives the bolt (46) oscillating movements around the pins (45).
  • a handlebar (49) engaging on one end on the bolt (46) is articulated on the other end on a lever arm (51) which is attached to one end of an oscillating shaft (52) mounted in the housing parallel to the main shaft (7).
  • a lever arm (53) is connected to the other end of the oscillating shaft (52) and is connected via a link (54) engages a rocker arm (55).
  • This is attached to an oscillating shaft (56) (FIG. 1) mounted in the housing, which carries a further oscillating lever (57) which is connected to the pin (32) of the carrier (29) via a link (58). connected is.
  • a lever arm (60) is attached to the adjusting shaft (42) (Fig. 2) of the stitch actuator (40) and is connected via a link (61) to a crank (63) attached to an adjusting shaft (62).
  • a control crank (64) is clamped onto the control shaft (62) mounted in the housing and is connected via an intermediate member (65) and a further control crank (66) to an intermediate shaft (67) mounted in the housing.
  • a lever (68) is attached to this.
  • the lever (68) is connected via a ball pull rod (69) to one end of a rocking lever (70) which can be pivoted about an axis (71) fixed to the housing.
  • the still free end of the rocker arm (70) has a spherical projection (72) and projects into a positioning curve (73) of a lockable adjusting wheel (74) which is arranged on an axle (75) fixed to the housing.
  • the positioning curve (73) in the setting wheel (74) runs in a spiral shape with respect to its axis (75) in such a way that stitch lengths of, for example, 1 to 6 mm can be set on the upper feed foot (6).
  • a spring (76) surrounding the intermediate shaft (67) and fastened at one end in the housing holds the shoulder (72) of the rocking lever (70) in constant contact with one of the side walls of the positioning curve (73).
  • the adjusting shaft (62) is connected to the lower slide valve, not shown, in a known manner, so that when adjusting the adjusting wheel (74) both the upper feed foot (6) and the lower fabric slide can be adjusted synchronously.
  • the cylinder (24) (Fig. 1) of the follower (27) is equipped with a collar (80) with a
  • Screw (81) is fastened in the housing. It has an inner cylinder chamber (82) (Fig. 3) which is connected to a guide bore (83) in the collar (80). The piston rod (21) of the actuating piston (22) is guided in the guide bore (83). This is in the
  • Cylinder chamber (82) slidably arranged and divides them into an upper and a lower chamber (82a, 82b).
  • the two chambers (82a) are formed by sealing rings (86) which are located in grooves (87) in the sealing sleeve (84) and by a sealing ring (89) inserted in a groove (88) in a pipe extension (80a) of the collar (80) ) and (82b) sealed up and down.
  • the two chambers (82a) and (82b) are filled with oil, which through a connection piece (90) fastened in the cylinder (24) via a bore (91) projecting into the lowermost part of the lower chamber (82a) from one with the Connection piece (90) connected, not shown supply container is supplied.
  • the connecting piece (90) has a one-way ball valve, so that in the event of oil leakage due to the negative pressure that arises when the adjusting piston (22) goes up, oil is automatically sucked in from the reservoir.
  • An annular groove (92) with a sealing ring (93) is provided in the circumference of the central part of the actuating piston (22).
  • a transverse bore (94a and 94b) is provided in the actuating piston (22), which lie diagonally opposite one another and extends from the circumference of the actuating piston (22) to an inner bore (95) in the piston rod (21) extend.
  • the bores (94a and 94b) are arranged so that they are open towards the lower and the upper flange of the actuating piston (22).
  • the control bushing (25) mounted in the inner bore (95) of the piston rod (21) has an inner bore (96).
  • a transverse bore (97) into which a pin (98) protrudes, which is fastened in a lifting piece (99) and also penetrates a slot (100) in the piston rod (21).
  • the cross bore (97) is slightly larger in diameter than the diameter of the pin (98).
  • the lifting piece (99), which has a nose (101) projecting to the rear, is designed in the form of a cap and is slidably mounted on the piston rod (21). It is provided with an annular groove (102) which is open on one side and into which a clamping ring (103) clamped on the piston rod (21) is inserted.
  • the width of the annular groove (102) is larger than the width of the clamping ring (103).
  • a leaf spring (104) arranged in the housing pushes the whole connection system (23) downwards.
  • connection chambers (105a, 105b) are formed. From this extends A rectangular opening (106a or 106b) through the wall of the control bushing (25) into the inner bore (96).
  • a control rod (111) is mounted, the central part of which forms the follower piston (26).
  • the part of the control rod (111) above and below the follower piston (26) is reduced in diameter.
  • the follower piston (26) just covers the openings (106a and 106b) in the control bushing (25).
  • Ring grooves (112 and 113) with sealing rings (114 and 115) are provided in the control rod (111) above and below the follower piston (26).
  • the control rod (111) projects downwards into an axial bore (116) of the presser rod (2) guided in the lower part of the piston rod (21). Both rods (2 and 111) are connected to one another by a pin (110) which is fastened transversely in the presser bar (2) and projects through a slot (117) in the control bar (111).
  • a bore (118) is provided in the presser bar (2), in which a compression spring (119) is received. This is supported against the lower end of the bore (118) and against the control bush (25).
  • annular flange (120) is clamped, in which a bore (121) is incorporated.
  • the end of a rod (123) fastened in a bore (122) in the support element (20) is slidably fitted therein.
  • On the free end of the rod (123) is one on the The presser bar (2) attached to the support lug (2a) is slidably guided.
  • This has a receiving bore (124) for a spring (125) which is supported against the end of the receiving bore (124) and against a reinforcing ring (126) on the rod (123).
  • the rod (123) is closed with a locking ring (127).
  • the two springs (119 and 125) form a measuring element for detecting the forces acting on the sewing feet (1 and 6).
  • a shaft (128) is mounted, which is firmly connected to a hand lever (129).
  • a cam segment (130) is fastened below the nose (101) of the lifting piece (99).
  • the telescopic rod (31) arranged between the support element (20) (FIGS. 4 and 5) and the support (29) for the upper transport foot (6) is divided into an upper fork (131) and a lower fork (132).
  • the lower fork (132) is connected to a bolt piece (133) and the upper fork (131) to a socket piece (134), which are pushed into each other and held together by a screw (135) screwed into the bolt piece (133). Between the head of the screw
  • the feed size of the upper feed foot (6) (FIGS. 1 and 2) is adjusted by turning the setting wheel (74), as a result of which the positioning curve (73) rotates the intermediate shaft (67) via the rocker arm (70) accordingly.
  • the inter mediate shaft (67) adjusts the control shaft (62) via the intermediate link (65) and the
  • Control shaft (62) is changed.
  • the movement derived from the eccentric (41) is controlled via the drive connection - eccentric rod (47), bolt (46), handlebar (49), lever arm (51), rocker shaft (52), lever arm (53), handlebar (54), rocker arm ( 55 and 57), handlebar (58), pivot pin (32) and carrier (29) - transferred to the upper feed foot (6), which thereby executes a corresponding feed movement.
  • the lifting movement transmitted by the link (16) to the carrier (29) is delayed by the rocker (18) in the area between the positions (M 'and A') and accelerated in the area between the positions (M 'and 8') .
  • the upper transport foot (6) moves slowly in the area where it is placed on the material to be sewn, but quickly in the area where it is lifted off, so that bouncing phenomena when it is placed on the material to be sewn are largely avoided.
  • the leaf spring (104) which has a flat characteristic curve, presses via the piston rod (21), the handlebar (31) and the carrier (29) onto the upper transport foot (6) seated on the material to be sewn.
  • the spring force acting from the leaf spring (104) is z. T. during the pressing phase of the upper transport foot (6) reduced by the reaction force of the plate spring assembly (137).
  • the upper transport foot (6) is pressed on via the pretension of the plate spring assembly (137) and can be adapted to the desired transport behavior by adjusting the nut (138).
  • the contact spring of the top feed foot (5) is also dampened by the disc spring assembly (137).
  • the sprung handlebar (31) pushes the carrier (20) to the top, which urc hsichauchd the piston rods (21) wants to push up.
  • the leaf spring (104) acts on the carrier (20) with a predetermined force via the lifting piece (99), the clamping ring (103) and the piston rod (21). From this point, the force is directed to one or both sewing feet (upper feed foot 6 and presser foot 1) depending on the swing position of the rocker (18).
  • the two springs serve as work fields. They are pressed together individually or both together, and press the sewing feet onto the material with a given pressure.
  • the plate spring (136) serves to reduce rebound impacts due to the mass of the upper feed foot (6) at the start of its lifting process.
  • the presser foot (1) itself does not stand out from the sewing material when the sewing machine is in operation.
  • the telescopic rod (31) shortens during the work process while increasing the spring tension of the plate spring assembly (137) and returns to its original length when the load is released.
  • the plate spring assembly (137) thus takes up the remaining stroke as well as the stroke movement of the lower fabric slide above the needle plate after the upper feed foot (6) has been placed on the sewing material.
  • the spring (125) has a steep characteristic. It therefore reacts very quickly when the material to be thickened, its change in force is relatively large and therefore also has a favorable effect on the pressure conditions on the adjusting piston (22). Due to its steep spring characteristic, the travel of the spring (125) can only be short.
  • the pressure spring (119) is therefore arranged parallel to it with a flat characteristic curve. Their spring force normally adds to the spring force of the spring (125). Once this, e.g. B. when lifting the two feet (1 and 6) completely relieved by actuating the hand lever (129) and thus becomes ineffective, the compression spring (119) presses the presser bar (2) down and thus guarantees the maintenance of the function of the follower piston (26).
  • the adjusting piston (22) can give in to the reaction force from below and also moves upwards until the reaction forces acting on the two rods (2 and 21) have returned to their normal strength and the springs (137, 125 and 119) push the push rod (2) in relation to the piston rod (21) has returned to its normal position.
  • the adjusting piston (22) is moved until the conditions have stabilized again.
  • the hand lever (129) is pivoted upwards.
  • the curve segment (130) thereby presses the nose (101) of the lifting piece (99) upwards, which takes the control bushing (25) with it so far that there is between the follower piston (26) and the openings (106a and 106b ) forms a narrow gap.
  • the cylinder chambers (82a and 82b) are connected to one another in the manner described above and an oil exchange can take place.
  • the sewing feet are lowered by pivoting the hand lever (129) downwards, whereby the cam segment (130) releases the lifting piece (99).
  • the ßlattfeder (104) can now press the control bushing (25) down, whereby the two cylinder chambers (82a and 82b) remain connected to each other, since the presser bar (2) remains in the lower position by the compression spring (119).
  • the actuating piston (22) is then moved downward by the pressure also exerted on it until the connection between the two cylinder chambers (82a and 82b) is separated again.
  • the top transfer device and its connection to the hydraulic controller are opposite greatly modified in the first embodiment. Essentially only the modified version is shown. Elements which correspond to the exemplary embodiment described are provided with the same reference symbols. As far as similar parts are concerned, they are provided with an apostrophe.
  • the needle bar support (3 ') which swings around a pivot (150), is mounted. This carries one on the back
  • a presser bar (2 ') which is hollow in its lower end is a
  • the presser bar (2 ') With its upper end, the presser bar (2 ') is connected in an articulated manner to a triangular lever (163) via an articulated link (162).
  • This has a bore (165) in which a rod part (167) is guided.
  • An upper transport foot (6 ') is attached to its lower end.
  • the stanoic part (167) is with its own Provide elongated hole (168) through which a pin (169), which is fastened transversely in the upper transport rod (165), extends.
  • a pin (170) connected to it in the axial extension of the rod part (167) is guided in an inner shoulder (171) of the bore (166).
  • a spring (172) is mounted on the pin (170) between the rod part (167) and the inner shoulder (171).
  • a second spring (173) is arranged between the inner shoulder (171) and a screw (174) screwed into the upper end of the pin (170).
  • the springs (172 and 173) hold the upper feed foot (6 ') in a predetermined central position
  • the triangular lever (163) is connected via a hinge pin (175) to an arm (176) which is mounted on a pin (177) fastened in the housing.
  • the up and down movement of the presser foot (1 ') and the upper transport foot (6') are generated by an eccentric (13 ') (see also Fig. 7) attached to the main shaft (7), which also has an eccentric rod (179) an arm (180a) of an angle lever (180) is connected.
  • This is mounted on a pin (181) fixed to the housing and its other arm (180b) is connected to the triangular lever (163) via a coupling (182) and a bearing pin (183).
  • the hinge pin (175) is connected to a pin (185) of a transmission rod (186) (FIG. 8) via a pair of plates (184), of which only the foremost plate can be seen.
  • This is part of a transmission connection (23 ') which has a follower regulator (27') consisting of a hydraulic cylinder (24 '), an actuating piston (22') and a follower piston (26), which is connected to the transmission rod (186) connected is.
  • the cylinder (24 ') is fastened in the housing of the sewing machine with a screw (187). It has an inner cylinder chamber (82) and is with a piece of pipe
  • the upper part of the bore (189) in the piston rod has an internal thread for screwing in the control bushing (25 ').
  • the upper part is provided with a corresponding external thread.
  • the control bushing (25 ') has an inner bore (191) which merges into a threaded bore (192) in the upper part.
  • a longitudinal slot (193) is also provided in the upper part of the control bushing (25 ').
  • control bushing (25 ') are in the area of the actuating piston (22'), as in the first
  • two connecting chambers (105a, 105b) created by milling are provided, which are supplemented by rectangular openings (106a, 106b).
  • the control rod (111) projects downward from the control bushing (25 ') into an axial bore (195) in the lower part of the piston rod (21 ') there are transmission rods (186).
  • the two rods (186 and 111) are connected to one another by a pin (196) which is fastened transversely in the transmission rod (186) and projects through a slot (197) in the control rod (111).
  • a flange (198) is fastened, on which one end of a compression spring (199) guided on the pipe section (188) rests, the other end of which is supported on the lower part of the cylinder (24') .
  • the transmission rod (186) is firmly connected to a shoulder (200) which is held at a distance from the flange (198) by a plate spring assembly (201).
  • the plate spring assembly (201) and the compression spring (199) hold the actuating piston (22 ') in the stationary state in a center position sprung up and down.
  • a screw (203) is adjustably attached to the attachment (200) by two nuts (202), the shaft of which has a bore (204) in the
  • a plate spring assembly (205) is provided on the shaft.
  • the height of the control bush (25 ') is adjusted so that the follower piston (26) just covers the openings (106a and 106b) in its spring-loaded middle position.
  • the spring characteristic of the plate spring assemblies (201 and 205) can be changed by changing the position of the screw (203) relative to the shoulder (200). These serve as a measuring element for detecting the forces acting on the sewing feet (1 'and 6').
  • the torsional vibration of the triangular lever (163) generates the upward and downward movement of the two sewing feet (upper feed foot (6 ') and presser foot (1') and thus also their contact pressure on the material.
  • the contact pressure is determined by the pressure of the springs (159 and 172) of the two sewing feet and the pressure via the gear connection (23 '), as will be explained in more detail later.
  • the gear connection (23 ') acts with a force determined by the compression spring (199) via the pair of plates (184) on the hinge pin (175) and thus also on the triangular lever (163). From this, the force, depending on the swing position of the triangular lever (163), is applied to one or both sewing feet (upper feed foot 6 'and
  • Presser foot 1 ' passed.
  • the two springs (159 and 172) serve as working springs. They are pressed together individually or both together, and press the sewing feet onto the material with a given pressure.
  • the springs (161 and 173) are stop springs to avoid rebound impacts during the lifting process of the respective presser foot.
  • an average of the impulsive reaction forces acting on the sewing feet is established. This mean value is transmitted to the transmission rod (186) via the pair of tabs (184).
  • the strongly impulsive reaction forces of the two sewing feet cause rhythmic movement impulses on the gear connection (23 '). They become strong through their specific training subdued.
  • the gear connection (23 ') thus remains relatively rigid with the sewing conditions remaining the same and only the sewing feet themselves perform an up and down movement.
  • connection chamber (105b) and the bore (94b) flow into the lower cylinder chamber (22b).
  • the adjusting piston (22 ') can yield to the reaction force from below and also pushes itself upwards until there is an approximate balance of forces between dynamic ones
  • Linkage forces mean value from below and the static Ge ⁇ enkraft the compression spring (199) has set.
  • the plate spring assembly (205) is connected in parallel to the compression spring (199).
  • the two springs (199 and 205) are clamped together with the plate spring assembly (201) via the screw (203).
  • this spring system can also be subjected to tension, so that the frictional connection and thus also their mutual positive locking in the absence of reaction forces via the sewing feet (1 'and 6'), e.g. B. is not lost in the sudden transition to a lower substance level. This prevents noise and any tendency of the control system to oscillate.
  • the throat plate is essentially absorbed by the springs (159 and 172). The possibly still remaining
  • the stroke effect on the transmission rod (186) is significantly smaller than the length of the lost motion of the pin (196) in the slot (197).
  • This idle stroke connection forms a so-called three-point control, which ensures that the gear connection (23 ') remains in the steady state during normal sewing.
  • the hand lever (128 ') is pivoted upwards.
  • the cam segment (129 ') thereby presses the arm (176) upwards, which also pushes the follower piston (26) upwards via the pair of plates (184) and the transmission rod (186).
  • the cylinder chambers (82a and 82b) are connected to one another in the manner described above and an oil exchange can take place.
  • the actuating piston (22) moves upwards in the cylinder chamber (82) until it has reached the position determined by the end position of the arm (176) .
  • the sewing feet are lowered by pivoting the hand lever (128 ') downwards, as a result of which the cam segment (129') releases the arm (176).
  • the through the compression spring (199) formed bias can now push the transmission rod (186) with the follower piston (26) down, whereby the two cylinder chambers (82a and 82b) are connected to each other.
  • the actuating piston (22 ') is then moved downwards by the pressure exerted on the flange (198) by the prestress until the connection between the two cylinder chambers (82a and 82b) is separated again.
  • FIG. 9 shows a shape of the actuating piston and the control bushing which is modified compared to the configuration according to FIG. 8, in order to achieve a fine adjustment of the initial position of the hydraulic regulator.
  • the control piston (22 ") of the controller (27") is provided with an annular groove (208) in which a sealing ring (209) is inserted.
  • the actuating piston (22 ") is chamfered above and below the annular groove (208), so that inclined surfaces (210 and 211) are formed, in which four upper and four lower bores (212 and 213) offset by 90 ° are provided, which extend outwards from the bore (1.89) in the actuating piston (22 ").
  • the bore (189) has an annular groove (214 and 215) in the area of the bores (212 and 213).
  • the control book (25 ") consists of a socket part (216) and a socket part (217) which are pushed into one another and glued to one another.
  • the socket part (217) contains two opposing milled portions (218a and 218b) which cover the Cover the follower piston (26) straight in its middle position.
  • the socket part (216) has two diagonally opposed and mutually vertically offset milled portions (219a and 219b) such that one milled portion (219a) in the area of the annular groove (214) and the other milled area (219b) in the area of the annular groove (215) is arranged.
  • the milling (219a) is opposite an upper part of the milling (218a) and the notch (219b) is opposite a lower part of the milling (218b). In this way, the average height of the follower piston (25) can be finely adjusted by simply turning the control bushing (25 ").
  • a spring housing (211) is clamped on the piston rod (21 '), which receives a preloaded plate spring assembly (212). This is supported on the one hand against the spring housing (211) and on the other hand against a bushing (213) guided on the transmission rod (186) or a shoulder (214) of the transmission rod (186).
  • a locking ring (215) inserted in a groove in the spring housing (211) secures the position of the bushing (213).
  • the working range of the controller (27 ') lies during normal sewing within the pretension of the plate spring assembly (212), so that the control function of the controller (27') does not start in this area.
  • the control function of the controller (27') does not start in this area.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

Dans les systèmes connus de réglage en hauteur, la hauteur du système du pied presseur ne se règle pas facilement pour s'adapter aux variations de l'épaisseur du tissu. Dans ce nouvel agencement, ce réglage est automatique. Pour permettre une adaptation automatique, la liaison d'entraînement entre le pied de transport supérieur et le pied presseur se présente sous la forme d'un régulateur séquentiel. Ce dernier est de préférence un régulateur hydraulique (27, 27') fixé au bâti de la machine à coudre et renfermant un piston de réglage (22, 22') et un piston séquentiel (26) qui sont assujettis l'un à l'autre par un élément de mesure se présentant sous la forme d'un ressort (119, 125 ou 201, 205 ou 210, 212) afin de tirer partie des forces de réaction s'exerçant sur les pieds-de-biche pendant le processus de couture. Le régulateur séquentiel s'utilise pour divers types de dispositif de transport supérieurs dans des machines à coudre.
PCT/EP1988/000414 1987-07-27 1988-05-13 Machine a coudre a dispositif de transport superieur WO1989001067A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019890700514A KR890701824A (ko) 1987-07-27 1988-05-13 상부운반 장치가 달린 재봉틀
DE8888904400T DE3870244D1 (de) 1987-07-27 1988-05-13 Naehmaschine mit einer obertransporteinrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873724786 DE3724786A1 (de) 1987-07-27 1987-07-27 Naehmaschine mit einer obertransporteinrichtung
DEP3724786.7 1987-07-27

Publications (1)

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WO1989001067A1 true WO1989001067A1 (fr) 1989-02-09

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PCT/EP1988/000414 WO1989001067A1 (fr) 1987-07-27 1988-05-13 Machine a coudre a dispositif de transport superieur

Country Status (6)

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EP (1) EP0368869B1 (fr)
JP (1) JPH02504345A (fr)
KR (1) KR890701824A (fr)
DE (3) DE3724786A1 (fr)
ES (1) ES2008505A6 (fr)
WO (1) WO1989001067A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008850A1 (fr) * 1989-01-27 1990-08-09 G.M. Pfaff Aktiengesellschaft Machine a coudre a transporteur superieur
WO2010144013A1 (fr) * 2009-06-11 2010-12-16 Vsm Group Ab Dispositif d'alimentation supérieur de machine à coudre
US8606390B2 (en) 2007-12-27 2013-12-10 Vsm Group Ab Sewing machine having a camera for forming images of a sewing area
US8683932B2 (en) 2007-08-30 2014-04-01 Vsm Group Ab Positioning of stitch data objects
US8763543B2 (en) 2008-06-26 2014-07-01 Vsm Group Ab Mechanically operated presser foot lift arrangement and a sewing machine comprising the arrangement
US8833281B2 (en) 2009-06-01 2014-09-16 Vsm Group Ab Texture hoop fixture
US8925473B2 (en) 2007-11-09 2015-01-06 Vsm Group Ab Thread cut with variable thread consumption in a sewing machine
US8960112B2 (en) 2013-02-01 2015-02-24 Vsm Group Ab Stitching system and method for stitch stop embellishments
US8985038B2 (en) 2010-06-09 2015-03-24 Vsm Group Ab Feeder movement compensation
US9631304B2 (en) 2013-03-15 2017-04-25 Singer Sourcing Limited Llc Variable timing system of a sewing machine and method for selectively adjusting a timing of such a system
CN111411454A (zh) * 2020-04-26 2020-07-14 台州斯诺克电子科技有限公司 缝纫机上的外挂式送布辅助装置
US20230250569A1 (en) * 2022-02-09 2023-08-10 Steven Marcangelo Sewing machine with adjustable stepping height and related methods

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724786A1 (de) * 1987-07-27 1989-02-16 Pfaff Ind Masch Naehmaschine mit einer obertransporteinrichtung
DE4230747C2 (de) * 1992-09-14 1994-08-11 Duerkopp Adler Ag Verfahren zum Betreiben einer Nähmaschine
DE19603294C1 (de) * 1996-01-30 1997-09-25 Duerkopp Adler Ag Nähmaschine mit Obertransportvorrichtung
IT1314415B1 (it) * 2000-06-23 2002-12-13 Vi Be Mac Spa Dispositivo per il controllo della pressione dei piedini premistoffaper macchine da cucire o simili.
DE102012207257B4 (de) * 2012-05-02 2014-01-16 Minerva Boskovice A.S. Nähmaschine
CN104652045A (zh) * 2015-02-09 2015-05-27 浙江乐江机械有限公司 一种缝纫机

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DE3333571A1 (de) * 1982-09-16 1984-03-22 Yamato Mishin Seizo K.K., Osaka Automatische einstellvorrichtung fuer den oberen transporteur einer steppmaschine
DE3704824A1 (de) * 1986-02-15 1987-08-27 Brother Ind Ltd Musternaehmaschine

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DE7123663U (de) * 1971-09-23 Pfaff Industriemaschinen Gmbh Obertransportvorrichtung an einer Nähmaschine
JPS54150244A (en) * 1978-05-17 1979-11-26 Janome Sewing Machine Co Ltd Device for automatically adjusting cloth holdddown pressure on sewing machine
DE3528295A1 (de) * 1985-08-07 1987-02-19 Pfaff Ind Masch Naehmaschine mit einer abtastvorrichtung
DE3724786A1 (de) * 1987-07-27 1989-02-16 Pfaff Ind Masch Naehmaschine mit einer obertransporteinrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3333571A1 (de) * 1982-09-16 1984-03-22 Yamato Mishin Seizo K.K., Osaka Automatische einstellvorrichtung fuer den oberen transporteur einer steppmaschine
DE3704824A1 (de) * 1986-02-15 1987-08-27 Brother Ind Ltd Musternaehmaschine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990008850A1 (fr) * 1989-01-27 1990-08-09 G.M. Pfaff Aktiengesellschaft Machine a coudre a transporteur superieur
US5138962A (en) * 1989-01-27 1992-08-18 G. M. Pfaff Aktiengesellschaft Sewing machine with an upper feed mechanism
US8683932B2 (en) 2007-08-30 2014-04-01 Vsm Group Ab Positioning of stitch data objects
US8925473B2 (en) 2007-11-09 2015-01-06 Vsm Group Ab Thread cut with variable thread consumption in a sewing machine
US8606390B2 (en) 2007-12-27 2013-12-10 Vsm Group Ab Sewing machine having a camera for forming images of a sewing area
US8763543B2 (en) 2008-06-26 2014-07-01 Vsm Group Ab Mechanically operated presser foot lift arrangement and a sewing machine comprising the arrangement
US8833281B2 (en) 2009-06-01 2014-09-16 Vsm Group Ab Texture hoop fixture
WO2010144013A1 (fr) * 2009-06-11 2010-12-16 Vsm Group Ab Dispositif d'alimentation supérieur de machine à coudre
US8985038B2 (en) 2010-06-09 2015-03-24 Vsm Group Ab Feeder movement compensation
US8960112B2 (en) 2013-02-01 2015-02-24 Vsm Group Ab Stitching system and method for stitch stop embellishments
US9631304B2 (en) 2013-03-15 2017-04-25 Singer Sourcing Limited Llc Variable timing system of a sewing machine and method for selectively adjusting a timing of such a system
CN111411454A (zh) * 2020-04-26 2020-07-14 台州斯诺克电子科技有限公司 缝纫机上的外挂式送布辅助装置
US20230250569A1 (en) * 2022-02-09 2023-08-10 Steven Marcangelo Sewing machine with adjustable stepping height and related methods
US11946182B2 (en) * 2022-02-09 2024-04-02 Steven Marcangelo Sewing machine with adjustable stepping height and related methods

Also Published As

Publication number Publication date
EP0368869B1 (fr) 1992-04-15
DE3724786A1 (de) 1989-02-16
EP0368869A1 (fr) 1990-05-23
JPH02504345A (ja) 1990-12-13
DE3902443A1 (de) 1990-08-09
DE3870244D1 (de) 1992-05-21
DE3724786C2 (fr) 1990-06-21
KR890701824A (ko) 1989-12-21
ES2008505A6 (es) 1989-07-16

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