WO2006012768A1

WO2006012768A1 - Device and method for a carder

Info

Publication number: WO2006012768A1
Application number: PCT/CH2005/000454
Authority: WO
Inventors: Götz Theodor GRESSER; Roland Styner
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2004-08-03
Filing date: 2005-07-29
Publication date: 2006-02-09
Also published as: EP1781847A1; BRPI0512787A; DE502005009148D1; CN1993506B; EP1781847B1; CN1993506A

Abstract

The invention relates to a device and a method by means of which the air flow and the fibre flow on the roller (6, 8) can be matched to operating conditions using a controlled positioning of an air guide element (22). The above is achieved by means of said device, whereby said air guide element (22), comprising at least one reference point, lying on a line with a separation from the surface of the roller (6, 8), running essentially along the surface, may be displaced and by means of a corresponding method.

Description

Device and method on a card

The invention relates to a device for adjusting the air and Faserstromvertei¬ ment at a transition from a carding drum to a buyer by positioning at least one Luftleitelements, said after mounting the air guide against at least one fast-running roller, namely the card drum and / or the customer, is arranged between the air guide element and the roller, a working gap and a method for positioning of the air guide element according to the preamble of claim 9

State of the art

The invention relates to the adjustment of the air and fiber flow on a Kar¬ de. The tasks of the carding machine include the triggering down to the individual fiber, the precipitation of impurities, dust and short fibers, the dissolution of nits, the improvement of the fiber mixture, alignment of the fibers and band formation. For this purpose, the fiber material is mainly on the card drum, also called Tambour processed.

The drum is followed by the customer, who has to take off individual fibers from the drum and compress them into a fleece.

The transition from the drum to the consumer forms a very sensitive area. Nach¬ the material is once on the customer, the actual carding is completed and the fleece is formed only to a band.

The material which has been brought into parallel alignment on the carding drum is brought back into a certain random position at the point of transition from the spool to the taker, and this leads to a folding of the ends of the fibers. The transition shall be so arranged that the quality of the material is not unduly affected by the above operations. In addition, the transition point between the drum and the pickup decides in no small degree on the carding quality, since this depends on which part of the fiber material is transferred from the drum to the pickup and thus influences or determines the fiber transfer factor.

The tendency for fiber adhesion to the roll fittings or fiber separation at the interface is influenced by the air flow around the rolls.

One way to control the air flow around the carding drum is shown in DE 101 10 824. The document discloses a casing of the drum, which has air passage openings. These false air inlets and outlets are adjustable by means of rotatable gelager¬ ter air guide elements. With this method, however, the sensitive area between the card drum and the pickup or take-off roll can not be directly influenced.

It is known from the prior art that the distribution of the air and fiber streams at the transition between the drum and the pickup can be influenced by an air guide element, also called guide element or tongue in the following. Such elements are shown, for example, in EP 984 088 A2, in particular various types of assembly. The distance between the guide elements and the roller can be selected, but it is firmly mounted.

The baffle influences the flow of air passing by the roller. This, in turn, has an influence on the adhesion or the tendency to detach the fiber material lying on the roller. EP 984 088 A2 shows that the shape of the air-guiding element shapes the course of the air stream flow lines, a laminar flow field being preferred.

The adjustment or device of the guide elements takes place before a charge of the card. It is then checked by an installer on the respective material to be processed, which amount of fibers passes to the customer and which fleece quality is produced by the removed fibers. In particular, it checks whether the removed fleece is dense, has holes or dilutions, whether thickenings show up, irregularities occur and how the hairiness of the fleece is provided.

The fitter varies by hand the distance of the tongue to the roller and the inclination of the tongue until it is satisfied with the quality of the fleece. Adjusting means which can be used are described in EP-B-790,338. According to the last-mentioned document, an adjustment means is to be carried out through the drum shield in such a way that it is accessible from the outside of the shield.

But it is also to be considered that the air guide extends over the entire working width of the card and must be adjusted as equal to the width. It must therefore be provided two adjusting means each on a drum plate. However, the installer can not possibly work on both such adjustment means at the same time.

Furthermore, since the rollers are operated with different fiber materials and different operating parameters, such as speed, production, etc., it is desirable for the air flow to be controllable or controllable.

Object of the invention

The object of the invention is to provide a device with which can be optimally adapted to the operating conditions by positioning an air guide the air flow and the fiber flow to the roller.

Solution of the task

In a first aspect, the object is achieved by a device of the generic type in which the air-guiding element has at least one reference point which is located on a line which is at a distance from the surface of the roller and in essence extends along the surface, is movable, and a method according to An¬ claim 10th

In a second aspect, the object is achieved by an adjusting device which is suitable for adjusting the air guiding element over the entire working width and which can be actuated from a predetermined setting position. This setting position is preferably easily accessible to the machine operator.

In a third aspect, the object is achieved by a guide for the air guide, which allows the adjustment of the element in the circumferential direction of a roller, in particular the card drum.

Advantages of the invention

A core of the invention is that the air guiding element can be moved around the roller.

Inventive air guide elements are used at the transitions, at which the fiber material is fed from one roller to another, namely from a carding drum to a pickup. Viewed from one side, one roller turns clockwise and the other counterclockwise, with the two rollers moving in unison at the point of their closest approach. In the areas in which the surfaces of the rollers separate from one another, air-guiding elements are provided.

For example, a baffle may be attached to each of the carding drum and the pickup, or only one baffle is provided which has a shape that affects the flow of air about both bobbins. It may also be sufficient to attach only one guide element to one of the rollers. A positioning of the air guide element according to the invention allows the air guide element to be brought either closer to the area of closest proximity between the two rollers or to further remove the air guide element from this area.

In the transition region, it should be ensured that a definable amount of Faser¬ material passes from one roller to the other roller. Depending on the present combination of many operating parameters, the material tends more or less to remain on the carding drum or peel off and change to the pickup. Examples of such parameters are fiber type, fiber length, production, roller speed and climate, especially temperature and / or humidity.

The very fast rotating card drum forms an air cushion around the tambour mounted clothing, which is pulled along with the roller. In the transition region after the first position between the drum and the pickup, this can lead to a suction in the direction of the drum, which holds more fiber material than desired on the card drum. The nonwoven on the pickup then has dilutions or even unwanted holes.

For relatively low band weights (for example 2 to 8 ktex, in particular 4 to 6 ktex) and thus relatively thin nonwovens, the risk of hole formation is particularly great.

On the other hand, material deposits can form on the edge of the air-guiding element which, in an irregular sequence, lie either on the spool or on the customer. In the latter case, holes or unwanted thickening also form on the removed nonwoven. This occurs even when large production fluctuations occur. Examples of such variations are

(a) if high production (for example> 150 kg / h) is changed from low production (eg approx. 40 kg / h), or b) during piecing, when normal production (for example> 80 kg / h) is run by creeping gear (for example at about 5 kg / h).

The transfer rate and the clean running behavior (without fleece disturbances) also depend on the fiber length. For example, if the distance between the Luftleit¬ element and the narrowest point Tambour / customer too large, so forms in the gusset, d. H. in the area where the drum and the takers move away from each other, a volume in which short fibers can jump uncontrollably back and forth. If the distance is too small, however, longer fibers can accumulate on the tongue edge pointing in the gusset.

For each case, the optimized conditions must be determined. So that the machine does not have to be completely retrofitted during every change in operation, it is advantageous if the air guiding element can be moved within a certain range. Preferably, a movement closer to or away from the narrowest portion of the gusset between the drum and takers.

The size of the working gap, which forms the spoiler element with the surface of the roller on which the clothing is located in the case of a carding drum, is in the millimeter or tenths of a millimeter range. Therefore, in the solutions of the prior art at least portions of the air guide element were kept in a fixed position. After loosening the attachment so the air guide was manually adjustable, but otherwise firmly attached to the card frame. Of course, compared to the working width of the drum, which is within the meter range, only very small changes in the position of the element are possible.

In a preferred embodiment of the present invention, the entire Luftleit¬ element is movable. An exact guidance of the element is nevertheless possible, for example because a line is provided on which at least one reference point of the guide element is guided. The reference points may be an axis which runs through the entire guide element over the entire working width, may be points lying symmetrically to one another at the respective ends of the guide element, or points located in regions which are particularly specific serve for attachment, or assembly of the air guide. The reference point can also be the center of gravity of the Leitele¬ ment.

The guide line can be implemented inter alia by corresponding guide rails or guide grooves, in which the guide element is held. The guide element can also be guided in a shell-like element, so that the guide line according to the invention is part of a guide surface.

The line preferably runs substantially along the surface of the roller, in particular in the circumferential direction, which allows movement of the guide element around the waist. If the line were perpendicular to the roll surface, a movement along the line would only correspond to a distance variation from the guide element to the roll surface.

The guide element can be locked only at a few selected points on the guide line or on all points of the guide line, so that a stu¬ fenlose adjustment is possible.

Depending on the position of the guide line relative to the roller surface, the distance and the inclination of the air guide element relative to the roller can be changed during a movement of the air guide element along the line.

In a preferred embodiment, at least one reference point of the Leit¬ elements is guided on a line which is coaxial with the roll axis and with wel¬ cher the guide element forms a working gap. During a movement of the air guide element, the distance between the roller surface and the air guide element remains constant. The positioning of the air guiding element according to the invention can be combined with the variation possibilities known from the prior art. For example, the distance of the air guiding element from the roller can be adjustable and / or the air guiding element can have a reference point through which an axis passes, around which the air guide is rotatable.

In addition, the casing of the rollers may be provided with air passage openings, the false air supply and / or dissipate.

The position of the air guide element can be permanently mounted during assembly of the machine, but in a preferred embodiment the air guide element is connected to a control device by means of which the movement of the air guide element can be carried out in a controlled manner. The control device may have its own drive, for example, a servomotor may be provided, which sets a guided movement of the guide element in motion. An operator of the machine can determine the position of the air guide element via the control device.

It can also be provided that the control device automatically characterizes the type of raw material and / or the rotational speed of the roller as a function of an adjustable parameter set, which measures, for example, the weight of the strip at the output of the card or on the reel, and carries out the positioning of the guide element ,

In a preferred embodiment, the device is provided with at least one optical detection element.

This element can be a camera, with which the position of the tongue can be observed even when the machine is closed. Under control of one or more cameras and display the images on a monitor, for example, the initial setting of the air guide element can be made by a fitter, which was previously performed with the machine open. It is convenient, not only the guide element, but also the quality of remaining on the card drum and / or observed on the customer deposited fiber material and display on a monitor.

The observation of the position of the guide element with a camera also has the advantage that the distances only millimeters thick can be increased and thus accurately controlled, as an adjustment by eye does not allow it, and what makes other tools for distance control superfluous.

The viewing angle of a camera can be directed to the slot between the card drum and the pickup and / or to the gap between the air guide element and a roller. It may also pass tangentially on the roller to detect the hairiness of the fiber material, or face frontally on a roller to detect holes or densities in the fiber material. A camera image of the area between the drum and the receiver can provide information as to whether material accumulates on the tongue.

The images recorded with the camera or cameras can be forwarded to an evaluation system. With this, it can be monitored, for example, whether and in which dimension a gap is added with material or whether the hairiness of the nonwoven is above a certain reference thickness. If the deviation from a predefined reference value becomes too great, an alarm signal can be triggered.

The optical elements can also operate as sensors for an additional light source and provide a measure of a distance, an angle or a fiber quality.

The detection of the optical signals can serve as a working aid for the initial setting of the machine, for controlling the once set parameters or for initiating readjustments.

The signals of a nonwoven monitoring device downstream of the drum / customer transfer point can also be used for the settings and / or monitoring of the Air guiding element are used, for example, a camera that monitors the fleece in the nonwoven bridge.

In a further expedient embodiment, the control device is connected to at least one transducer. The measured value can be a direct or indirect measure of the instantaneous position of the air guiding element. For example, it can specify a distance or an angle, but it can also quantify the pressure of the draft between the air guiding element and the roller. It is particularly advantageous if the air and / or fiber stream, or the distribution of the streams to the respective rolls, is measured directly. For this purpose, an air and / or fiber flow measurement can be carried out in the respective flow channels, ie in the gap between the guide element and the drum and / or in the gap between the guide element and the take-off roller. For comparison, for example, the pressure in the vicinity of the card drum can be measured before the air cushion reaches the transfer point.

The measured value can be displayed so that an operator of the machine can reposition the air guiding element depending on the measured value display. Vor¬ preferably a simple device is attached, which allows a simple precise manual adjustment, a scaling can then guarantee always the same setting and thereby simplifies the handling when changing the Baumwoll wollvorlage.

However, the control device can also carry out a comparison with a previously determinable desired value and, in the event of a deviation, emit a signal on the basis of which a machine operator is to become active.

The setpoint values can be predetermined by an installer or originate from a database which is compiled from parameter sets optimized for respective situations. In the database, for example, the relationships between the type of fiber material, the desired band weight, the Durchsatzge¬ speed and the setting of the air guide can be stored. In a particularly preferred embodiment of the invention, the Steuerein¬ direction comprises a control loop, with which the movement of the guide element is carried out automatically.

For example, an operator may specify a desired value, with the aid of which the control device uses the signals from the control loop to ensure that the position of the air guide element always maintains the measured value within a tolerance range around the desired value.

The invention is further achieved by a method in which the air guiding element is guided in a controlled manner around the roller.

An advantageous method is used for the initial setting of the air-guiding element, in that the positioning of the air-guiding element is carried out under optical control, the images being recorded by at least one camera located on the device.

In a preferred embodiment, the method is characterized by the following Verfahrens¬ steps. A control device with a measured value detection is provided on the device. The control device first of all compensates for a detected measured value with a predefinable desired value and, in the case of a significant deviation of the measured value and setpoint value, repositions the air-guiding element.

The process steps can be repeated either at adjustable time intervals, or the measuring control and, if necessary, the tracking of the guide element are carried out continuously.

Further advantageous embodiments will become apparent from the following drawings, the embodiments and the claims. drawings

Show it

Figure 1 is a schematic representation of a carding machine in section;

Figure 2 is a schematic representation of a first embodiment of an inventive device;

Figure 3 is a schematic representation of a second embodiment of an inventive device;

Figure 4 is a schematic representation of a third embodiment of an inventive device with indicated sensors;

FIG. 5 a schematic representation of some possible modifications of the arrangement according to FIG. 2;

Figure 6 shows a modification of the arrangement according to the figure 3 to the schematic

Representation of a solution with a controllable actuator;

FIG. 7 shows, in principle, a further development of the embodiment according to EP-B-984088, FIG. 10, this development being designed according to the present invention;

FIG. 7A shows a detail of a first embodiment of the principle according to FIG. 7;

FIG. 7B shows a detail of a second embodiment of the principle according to FIG. 7;

FIG. 7C shows a detail of a third embodiment of the principle according to FIG. 7;

8 shows schematically a reference system for a solution with a controllable actuator, and FIG. 9 schematically shows a control point for a solution with a controllable actuator.

Figure 1 shows a Wanderdeckelkarde, for example, the Rieter card C60, with a working width of 1, 5 M, with a hopper 1. The drawing shows the general sequence in a device to which the inventive device is preferably used.

Fiber flakes are transported by transport channels, not shown in the figure, and also by different cleaning process steps, not shown, and finally fed to the hopper 1 of the card. This passes the fiber flakes as cotton wool to the card. A feed roller 3 and a feed trough 2 feed the fiber flakes into lickerins 5. The lickerins 5 open the fiber flakes and remove part of the dirt particles. The last licker-in roller passes the fibers to the carding drum 6, also called card drum or drum. The carding drum 6 cooperates with covers 7 and in this case further parallelizes the fibers. The lids 7 wer¬ cleaned by a lid cleaning (in Figure 1 on the traveling lid unit right schematically shown, but not specifically designated) cleaned.

The zone between the card drum 6 and the lids 7 is called "main carding zone", while the area opposite to the main carding zone with respect to the drum axis is called "under carding zone".

After the fibers have partly carried out several revolutions on the card drum 6, they are removed from the doffer roller 8, also called "short doffer", from the card drum 6, fed to the exit rollers 9 and finally as a card sliver 10 in a not shown in the figure On the card drum 6 additional cleaning or separation sites are arranged, for example carding elements 12 or separation elements with knives 11. Various cleaning sites have additionally arranged downstream of suction channels which are intended to pass on the separated dirt locally associated with individual cleaning elements are on one side of the card in a zent- ral suction channel merged. An example of such a suction device on a card is described in EP 750 059 (Rieter).

Controlled (controlled) positioning of an air guiding element 22 according to the invention is preferably provided in the region in which the fiber material either reaches the region of the undercarding zone or is taken over by the consumer 8.

Figure 2 shows a schematic representation of a first embodiment of an inventive device 221, which is arranged in a region between a card drum 6 and a pickup 8. The device comprises a first air guiding element 222, which forms a working gap S with a roller, in this case the carding drum 6.

The air guide element 222 has at least one reference point, shown in the figure as a reference point 223, which is movable on a line 224 which extends at a distance 225 around a part of the surface 226 of the card drum 6. Preferably, this line 224 lies in a circle coaxial with the card drum 6. In this case, the distance between the reference point 223 and the surface 226 of the card drum 6 remains constant.

In a movement according to the invention of the air guide element 222, the distance 227 between the air guide element 222 and the narrowest point 230, d. H. the location of the smallest distance between card drum 6 and 8 customers.

Analogously, a positioning of a second air guiding element 228 can be carried out, which forms a working gap with a roller, in this case the pickup roller 8.

EP 0 984 088 A2 shows various possibilities for fastening an air guiding element. Thus, in FIGS. 1 and 2 of EP 0 984 088 A2, an air guiding element is embodied as a guide plate or tongue which is fastened to a support with a foot part, which in turn is fixed to a foot end with a machine frame part. is bound. In order to enable a movement of the guide plate according to the invention, the support may have a support surface opposite its foot part, which surface lies opposite the surface of the roller and on which the air guide element can slide to and fro. The bearing surface of the support defines in this case the guide line of the baffle.

Another type of fastening is provided in FIGS. 3 to 11 of EP 0 984 088 A2. In this case, the air guiding element is arranged on the so-called soft top segments, which form part of the drum shields arranged on both sides of the carding machine. In a preferred embodiment (according to FIGS. 7 to 10), the air-guiding element, called tongue in this case, is mounted on both sides on one arm each.

For an inventive positioning of the air guide element, the guide line can be specified either by the shape of the arm on which the tongue is movable back and forth, or the arm with a permanently mounted tongue performs the movement rela¬ tively to the drum plate.

FIG. 3 shows a schematic representation of a second exemplary embodiment of a device 321 according to the invention. In this example, only one air guiding element 322 is provided, which forms a working gap S with the carding drum 6 with a first surface 329 and a further working gap S with a second surface 330 'forms with the customer 8.

The air guide 322 is movable along a line 324 about the card drum 6 and also rotatably supported about an axis 331. With the rotation about the axis 331 lying in the air guiding element 322, the widths of the working gaps S, S 'can be changed.

FIG. 4 shows a further exemplary embodiment, wherein the device 421 according to the invention in turn comprises only one air guiding element 422 which can be moved along two lines with respect to the card drum 6 and the pickup 8. In this gur the two lines are each indicated by a double-pointed arrow on the element 422 itself.

In addition, FIG. 4 shows by way of example at which positions sensors can be provided. A first sensor 432 controls the fiber flow on the card drum 6 before the fibers reach the pickup 8.

The sensor 432 can be an optical sensor, for example a camera, or a measuring device, for example for detecting the pressure or the air or fiber flow.

Further sensors 433, 434 can be provided to control the flow through the work gaps S, or S ¹ , respectively. This control can also be carried out optically, ie with a camera or an optical sensor, or by means of a measurement value recording of pressure or flow.

With a further sensor 435 it can be observed whether and to what extent fibrous material deposits on the edge 436 of the air guide element 422 occur. There, short fibers can remain stuck, which flutters back and forth in the gap 437 between the drum 6 and the receiver 8 or long fibers whose one end initially adheres to the drum 6.

Further orientations of sensors are conceivable. Thus, a camera can be oriented tangentially to a roll surface in order to observe the hairiness of the fibers or to be directed directly into a working gap S or S ', or a camera can be aligned perpendicular to a roll surface and an image of the respective one Place roll of fiber material. Suitable monitoring systems for the interior of a card with a machine panel have been described for example in DE-A-10259475. In order to ensure a sufficient image quality, it may be necessary to attach additional light sources.

FIG. 5 shows a copy of FIG. 2 with minor modifications. According to a According to a modification, the air guiding element 222A at the free end is provided with a "head" on the drum 6. This head is substantially identical to the head which is located on the air guiding element according to FIG. 1 of EP-A-432430 (or US Pat. EP-B-790 338. The design of this head section helps to cleanly separate the fiber / air flows, which on the one hand continue to flow with the drum 6 and on the other hand follow the pickup 8. The position of the second air guiding element 228 associated with the pickup 8 is unchanged in Figure 5, as compared to Figure 2, because it is merely a schematic representation, but in practice one would have to optimize the mutual positioning of these two elements, which is achieved by an adjustment device according to the present invention is greatly facilitated.

5, the reference point 223 is displaced radially "inwards" relative to the drum 6. This results in a new movement line 224A, which is made possible by the element 222A At each end, which is outside the working width of the machine, is provided at a location remote from the head with a boom 227 which extends radially inwards from the elongate body of the element The reference point 223A is now located in this boom 227 The radial distance of the reference point from the axis of rotation of the drum can thus be chosen smaller or larger than the radius of the drum, or the radius of equal size.The line of movement 224A also need not be concentric or concentric with the axis of rotation of the drum Choice of the geometry of this line can be achieved by an adjustment of the element 222A in the circumferential direction of the drum simultaneously radial adjustment of this element take place.

FIGS. 6 and 7 show diagrammatically and in relation to the other figures each an enlarged variant of an adjusting device, which is suitable for use in connection with this invention. The solution according to FIG. 6 comprises a controllable actuator system. In FIG. 6, the drum is designated by the reference numeral 6, the customer by the reference numeral 8 and the narrowest point between these rollers by the reference numeral 230. The spoiler element is designated by the reference numeral 322A (see Fig. 3) and substantially comprises a profile extending over the entire working width of the card (1 to 1.5 m) extends. This profile is connected to supports 350 (only one support shown) by means of a pivot axis 331 A (see Figure 3) with a cross member 352. Traverse 352 has openings for guide bars 354 (only one bar 354) secured by support 356 on machine frame 355. A support also carries an electric motor 357, which can rotate a threaded spindle 358, wherein the threaded spindle 358 cooperates with a nut or a threaded bore 359 which is mounted in the cross member 352.

As the spindle 358 is rotated by the motor 357, the crosshead 352 moves along the bars 354, changing the distance between the "nose" 360 of the profile 322A and the narrowest point 230. However, the profile 322A may also be about the pivot axis 331A to thereby adjust the distance between the drum 6 and the surface of the profile 322A facing it For this purpose, the traverse carries, for example, a round disc 362 fixedly mounted on a shaft 364. The shaft 364 is the shaft of an electric motor 366, which is supported by the cross member 352. The profile 322A rests on the circular peripheral surface of the disc, which is mounted eccentrically on the axis of rotation of the motor shaft, thus, when the shaft 364 rotates, the distance between the cross member 352 and the middle surface changes of the profile 322A, which is in contact with the disc 362. In order to be able to carry out controlled movements, the actuator system may, for example, be a stepping motor or motors with encoder or resolver.

Of course, the embodiment according to FIG. 6 is complex and expensive, so that it is not suitable for cost-effective constructions. The solution according to FIG. 7 is much simpler. It is basically a further development of the embodiment according to Figure 10 in EP-B-984 088. The air-conducting element 222B (see Figure 2) - in EP-B- 790 338 called "tongue" - is formed in the shape of a continuous casting. The profile is mounted on the underside of an arm 112 by suitable means, which are explained in more detail below. The outer surface of the clothing (not shown) of the drum is indicated by dashed lines and designated 1 A. A gap E remains between the lateral surface 1A and its surface facing surface of the element 222B free. The arm 112 is part of a so-called canopy segment 125, which is positioned by means of a screw 126 in the machine frame. As explained in detail in EP-B-984 088, the arm 112 tends to be biased towards the _. Lateral surface 1A and is limited by a stop which is formed by the end of an adjusting screw 132 and thereby effectively determines the width of the gap E. This screw 132 is accessible to the machine operator from the outside of the machine plate 121. In this respect, the construction according to FIG. 7 essentially corresponds to the solution according to EP-B-984 088, FIG. 10, wherein in the last-mentioned embodiment the air guiding element has been secured to the carrier arm. According to the present invention, however, the element 112 is intended to be adjustable in the direction of the narrowest point (not shown in FIG. 7, cf. point 230, FIG. 2) between the drum and the pickup, or away from this point

In order to enable the latter adjustment, the profile 222B can be provided at each end with a supporting end head, which cooperates with the respective top segment outside the working width of the rollers - the one end head is indicated by the dashed lines 223 in FIG. Each end head 223 is also provided with a rod 130 which is guided by a sleeve 131 fixedly mounted on the arm 112. The rod 130 carries at its free end a disc 123 and a spring 120 acts in the sense between the sleeve 131 and the disc 123, that the air guide element is pushed back into a position remote from the constriction 230 (FIG. However, this displacement away from the constriction is limited by an adjustable stop, which in this embodiment is formed by a cam 124. The cam 124 is fixedly mounted on an axle 125 which is rotatably received in the drum plates (not shown in Figure 7). The cam 124 has a cylindrical lateral surface (not designated), which is arranged eccentrically with respect to the rotation axis 125. By rotating the axle 125, it is therefore possible to increasingly compress the springs 120 by displacing the disks 123 and to move the air guiding element 222B in the direction of the aforementioned constriction 230 or to relieve the springs 120 and thus to displace the element 222B from the To allow bottleneck away. The sketchy representations in FIGS. 7A, B and C each show a possible embodiment of the principle according to FIG. 7. In these detailed sketches, the hood segment is denoted by the reference numeral 125, the arm by the reference numeral 112 and the spoiler element by the reference numeral 222B designated. In each case only the solution on one side of the machine is shown, wherein the same solution principle can be applied mirror-image on the other side of the machine.

In the solution according to FIG. 7A, the abovementioned carrying end head is designed as a slide 150, which runs in a groove-shaped guide 152 in the side face of the arm 112. The guide runs concentrically with the lateral surface 1A (not shown in FIG. 7A, see FIG. 7), so that the element 222B retains its adjustment with respect to the lateral surface 1A while it is displaced with respect to the constriction 230 (FIG. The bushing 131 A is designed as a slide bushing, wherein additionally two hinges 154, 156 have to be provided in order to allow the required angular displacement of the rod 130 relative to the guide element 222B.

In Fig. 7B, the solution of the guiding problem has remained the same, and the same reference numerals 150, 152 denote the carriage and the guide grooves, respectively. However, the bushing 131 B in this variant has no guide function for the rod 130, it serves here only as a receptacle for the compression spring 120 (Fig. 7). The opening in the bushing 131 B must leave enough clearance against the rod 130 to allow the change in the angular position of the rod 130 (indicated by dashed lines) during a Verstellbe¬ movement of the element 222B.

In the solution according to FIG. 7C, the rod 130 is guided through two sliding bushes 131 C, which only permits a linear movement of the rod or of the element 222 B, as indicated by dashed lines in FIG. 7C. The adjustment of the element 222B in the circumferential direction is therefore accompanied in this case by an adjustment in the radial direction. In order to simplify the sketch, a radial adjustment has been assumed in the sense of an increase in the radial distance during a movement of the element in the direction of the constriction 230 (FIG. 2). the reduction of the radial distance during Verstel¬ len in the direction of the bottleneck can be provided.

The axis 125 can be provided jointly for both cams 124 and can be carried out on one side or on both sides of the carding machine through the drum plate, so that the axis 125 is accessible to the operator. Outside the shield, the axle can be provided with a hand crank, or with a receptacle for a hand crank, so that the adjustment of the air guiding element 222B can be carried out manually along the arm 112 from a predetermined position in the vicinity of the card.

This allows adjustment of the air guide element 222B in the circumferential direction of the card drum, wherein the adjustment of the air guide element in the radial direction must continue first on one side of the card and then on the other side - or simultaneously on both sides. However, it will be clear to the person skilled in the art that the adjustment in the radial direction can also be realized by means of a continuous axis, the axes being provided underneath the drum 6 and being suitable with the movable stops on the arms 112 Transmission elements must be connected.

Of course, the axis 125 could (also) be coupled to a controllable electric motor so that the adjustment can be controlled without direct manual intervention. A suitable actuator system is shown schematically, for example, in EP-A-627 508 (FIGS. 12 and 13) and a further development with piezoelectric translators has been described in connection with EP-B-787 841, FIG. A common adjusting axis for the radial adjustment could also be driven by an electric motor, or a controllable motor could be provided for each of the two stops on the arms 112.

The embodiments according to FIGS. 6 and 7 are intended merely as examples of two possibilities of actuators and are by no means to be regarded as limitations. One possibility, Fig. 6, consists in all the movements of the air guide be accomplished by a controllable actuator, which can be controlled for example by a Steuer¬ console of the machine - see. The second option, FIG. 7, is to effect predetermined movements by means of a relatively simple adjustment mechanism, which can preferably be actuated from an adjustment position, ie it is not necessary to actuate provide bei¬ the machine sides. There are also many alternative designs known that meet the requirements of these two options. For example, DE-A-3 702 588 shows both a controllable actuator system for linear movements (FIGS. 2, 5 and 6 of the DE document) of working elements of a card as well as a controllable actuator system for controllable pivoting movements (FIGS. 3 and 4) elements. Controllable pivoting movements are also shown and described in DE-A-3 825 419 and DE-A-10 231 829. The same actuator technology can in principle be adapted for use in connection with the adjustment of an air guide element.

If, as in FIG. 7, the air-guiding element is to be further adjusted by the operating personnel, it is not absolutely necessary to define reference points for a control. Setting values, for example predetermined distances from adjacent working elements, can be defined and controlled by the operator. The effect of a new adjustment can also be observed directly on the nonwoven product and possibly further modified if the result of the first adjustment is not satisfactory. However, at least for the automatic operation, it is necessary to set reference points, so that triggered by the control adjustments assume a detectable starting position. Possibilities for reference points are shown in FIG. 8, the schematic figure being designed as an example of the principle and not as a concrete embodiment.

The drum is also designated in Figure 8 by the reference numeral 6, wherein the curved line 6A represents the lateral surface of the clothing. The direction of movement of the clothing is indicated by the arrow. The spoiler is designated 822 and is greatly simplified in order to facilitate the description. The element 822 has an "inner surface" 823 which is intended to be at a predetermined distance from the outer surface 6A of the drum set at at least one point 822 A, which is intended to hold a predetermined distance from the narrowest point 230 (see FIG. 2) between the drum 6 and the pickup (not shown in FIG. In Fig. 8, it is assumed that the inner surface 823 should maintain a predetermined distance from the clothing at two locations, namely at location 824B (distance b) and at location 824C (distance c). Distance b is, for example, 1 to

5 mm and distance c is 0.5 to 3 mm.

There are three 830, 831 and 832 stops to set reference values for these distances. If the element 822 is in contact with all stops, said distances will have predetermined values. The actuators can assume these fixed values when performing controlled movements. Starting from its position in contact with the abutment 830, the element 822 can within a predetermined adjustment range t in the circumferential direction of the drum

6 are moved. This adjustment range includes, for example, a distance t of 5 to 30 mm. The invention is not limited to the set forth system for the formation of Refe¬ renzstellen. Measuring means could, for example, be provided in order to measure the existing distance between a predetermined point on the air guide element and a corresponding reference point on the machine frame, for example on the hood segment (cover bow). When using an absolute encoder in combination with the actuator can be dispensed with a referencing outside the actuator itself, if the actuator is placed at a predetermined position in the machine An¬.

FIG. 9 shows a portion of FIG. 1 to schematically illustrate the connection of the machine to a controller. The description of the elements which have already been explained in connection with FIG. 1 will not be repeated. However, a control console 900 with a computer 902, a screen 904 and a keyboard 906 is provided for the depicted machine. The computer 902 receives signals from sensor elements in the machine and supplies signals to the actuators of the machine. In the context of the present invention, only the actuator 908 for the air guide 922 is important. Three sensor elements 910, 911 and 912 are schematically indicated, these sensor elements being only examples of the many possibilities: Element 910 is a sensor for measuring an important distance between the air guiding element and a reference point, as already described in connection with FIG Figure 8 has been described. Measuring systems for determining such smaller distances are z. B: from DE-A-4 235 610 or EP-A-1 158 078. Element 911 is a camera, for example according to DE-A-10259475, for monitoring the state in the gap upstream of the air guide element. The image generated by the camera 911 may appear on the screen 904. Element 912 is a sensor means for checking the quality of the nonwoven product. Such elements are known, for example, from DE-A-4 115 968, DE-A-3 928 279, EP-A-738 792 and EP-A-1 068 380.

The operator can now enter a desired value for a given distance between the air guiding element and a specific reference point via the keyboard. This setpoint or setting value is at least the default setting. The computer then provides signals to the actuator 908, so that the air guide is moved into the defined default, with signals from the measurement sensor 910 are evaluated by the computer. However, it may happen that the sensor 912 detects defects in the fleece and reports to the computer 902. The computer evaluates the signals from the sensor 912 and in the case of a defect that can be corrected by changes in the setting of the air guide element, it then delivers signals to the actuators 908 to trigger the necessary adjustments, in turn, the signals from the Sensors 910 are taken into account. It is also possible for the operator to detect problems in the gap monitored by the camera 911 based on the image on the screen 904. Since the readjustment of the air guide element can also be carried out during the operation of the card, it is possible to enter a new desired value for the positioning of the air guide element via the keyboard and to observe the effect of the change both in the monitored gap and on the product.

The Aktoriklösungen according to Figures 6 and 7 are adapted to adjust the Luftleitele¬ ment over the entire working width. You can also In the case of the solution according to FIG. 6, the setting position is, for example, next to the control console, where the operating personnel can generate control commands for the actuators by means of the operating elements, such as the keyboard or screen. Of course, this adjustment position is easily accessible to the machine operator, but even in the case of the solution of Figure 7, the operator is now able to move the spoiler from a "setting position" near at least one end of the axle 125 (Figure 7) to adjust the operation of the card.

It will be clear to the person skilled in the art that a suitable locking can be provided in order to keep the air guiding element in a selected position reliable, but detachable. In the case of a manually operated adjustment device (eg, according to FIG. 7), the lock can also be operated manually, for example in the form of a lock, which prevents the cams from rotating. In the case of a controllable actuator system (eg according to FIG. 6), the locking can also be carried out in a controllable manner,

Claims

claims

1. card with a flow guide for influencing the Strömungsverhältnis¬ se in the area where the fibers are transferred from the drum to the customer, characterized by an adjusting device which is adapted to adjust the Leit¬ element over the entire working width, and which of a vorbe¬ certain setting position can be operated from.

2. Card according to claim 1, characterized in that the adjusting device comprises a controllable actuator, wherein the actuator can be controlled from the setting position.

3. card with a flow guide for influencing the Strömungsverhältnis¬ se in the area where the fibers are transferred from the drum to the buyer, characterized by a guide for the guide element, which mel the adjustment of the element in the circumferential direction of a roller, in particular the Kardentrom¬ , allows.

4. Apparatus for adjusting the distribution of air and fiber flow at a transition from a carding drum to a pickup by positioning at least one air guide element, wherein the air guide element after assembly with respect to at least one of the rollers, namely the card drum and / or the Abneh¬ mer arranged such in that an air gap forms between the air guide element and the roller, characterized in that the air guide element (22, 222, 228, 322) has at least one reference point (223) arranged on a line (224, 324) a distance (225) from the surface (226) of the roller (6, 8) and substantially along the surface (226) extends, is movable.

5. Apparatus according to claim 4, characterized in that the line (224, 324) is part of a circle whose center point on the axis of Roller (6, 8) is located.

6. Apparatus according to claim 4 or 5, characterized in that the distance of the air guide element (22, 222, 228, 322, 422) of the roller (6, 8) is adjustable and / or the air guide element (22, 222, 228, 322, 422) has a reference point, through which runs an axis (331) about which the air guiding element (22, 222, 228, 322, 422) is rotatable.

7. The device according to at least one of the preceding claims 4 to 6, character- ized in that the air guide element (22, 222, 228, 322, 422) is connected to a control device via which the movement of the air guide element (22, 222, 228 , 322, 422) is controllable.

8. Device according to at least one of the preceding claims 4 to 7, da¬ characterized in that the device comprises at least one optical detection element (432).

9. Device according to at least one of the preceding claims 4 to 87, characterized in that the device comprises at least one transducer, in particular a Strö¬ mungsmesser comprises.

10. Device according to one of claims 7, 8 or 9, characterized in that the control device carries out a comparison with a desired value.

11. Device according to one of claims 7 to 10, characterized in that the control device comprises a control loop, with which the movement of the air-conducting element (22, 222, 228, 322, 422) can be carried out automatically.

12. A method for adjusting the air and fiber flow distribution at a transition from a carding drum to a pickup by positioning at least one air guide, wherein

the air-guiding element is arranged after assembly with respect to at least one rapidly rotating roller, namely the card drum and / or the pickup,

a working gap is formed between the air-guiding element and the roller, characterized in that the air-guiding element (22, 222, 228, 322, 422) has at least one reference point lying on a line (224, 324) substantially along the Oberflä¬ surface (226) runs, is feasible.

13. The method according to claim 12, characterized in that an optical control by means of an optical detection element located on the device is feasible.

14. The method according to any one of claims 12 or 13, characterized in that a control device and a measured value detection is provided, which

- compensates the measured value with a predefinable setpoint; - Repairs the measurement and setpoint repositioning the Luftleit¬ element (22, 222, 228, 322, 422) makes.