CH680076A5 - Assembly to draw warp yarns into harness sections of loom - comprises oscillating warp drawing-in unit of flexible strip carrying gripper with interrupted channel guide - Google Patents

Abstract

The assembly has a flexible strip to carry a grip as the oscillating warp drawing-in unit. The channel guide for the gripper strip is interrupted at the harness elements. The movement of the warp through the grip is supported and a slit opening is the exit of the drawn-in warp from the guide. Pref. the yarn is carried in a clamping action which is fixed by the supports. The guide forms a channel which matches the cross-section of the warp drawing-in unit with a support to apply elastic pressure at one side against the grip . The elastic pressure can also be applied by two clamping pads, with limit stops to define their action against the sides. The guide channel is formed by a groove worked into a profile rod with a slit opening at its open side formed by a cover while the clamping pad is in the base of the groove. The channel has interruptions along its length for reciprocating ejection levers to move across the channel towards the slit opening for the warps. The ejection levers are moved between two positions through the channel breaks, as finger-shaped units operated pneumatically. Alternatively, the ejection levers project from a rotating hub, to move periodically in and out of the channel breaks through the hub rotation. The ejection mechanism is monitored. At the rear end of the gripper strip stroke path, near where it changes direction, the clamping action of the grip is released after the warp has been successfully drawn into place, where the channel opens out in a funnel shape and the yarn is carried by the grip only through friction. At the rear end of the channel, an interruption in the channel guide allows transfer units to take the end of the warp using a yarn clamp, a gripping surface for the yarn and a suction jet. The gripping surface is near the edge of the suction jet or forms the suction jet. ADVANTAGE - The unit to draw in the warp yarn has a trouble-free operation, without damage to the yarn surface. The guide channel allows higher working speeds with increased reliability and confidence that the warp will be laid in the correct harness components.

Description

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The invention relates to a device for pulling in warp threads in tableware elements of a weaving machine, with an oscillatingly drivable, needle-shaped pulling-in element for the warp threads.

In known devices of this type, the pull-in member is formed by a so-called pull-in needle, which has a hook-like end, with the help of which the warp threads are caught and drawn in. Quite apart from the fact that when using such a hook-shaped pull-in needle there is always the risk that a thread slides out of the needle and is therefore not or only partially drawn in, these pull-in needles are also not advantageous in terms of textile technology. Because the warp threads are practically deflected by 180 ° in the naturally very thin hook-shaped end and slide over their deflecting edge when pulled in, which means a not inconsiderable strain and possibly also influencing the thread on its surface.

The invention is now to provide a feed element with which the warp threads are drawn in as gently and safely as possible.

This object is achieved according to the invention in that the pull-in member has a flexible gripper band carrying a gripper and that a channel-like guide is provided for the pull-in member, which is interrupted in the area of the crockery elements and means for supporting the thread entrainment by the gripper and a slot-like opening for has the exit of the drawn-in warp threads from the guide.

The inventive design of the entry element and its guide channel enable an increase in the operating speed of the drawing-in machine while at the same time improving its reliability by ensuring that the warp threads are each drawn into the correct tableware elements. Since the thread is supported by the guide, all types of warp threads are securely drawn in.

The invention is explained in more detail below using an exemplary embodiment and the drawings; it shows:

1 is an overall perspective view of a drawing machine according to the invention,

2 is a perspective view of the feed module of the feed machine of FIG. 1,

3 is an illustration of the pull-in member,

4 is a view in the direction of arrow IV of FIG. 2,

5 is a view in the direction of arrow V of FIG. 4,

6 shows a section along the line VI-VI of FIG. 5,

7 shows different cross sections through the guide channel for the pull-in member shown in FIGS. 4 to 6,

8 shows a detail from FIG. 7c on an enlarged scale,

9 is a sectional view of the drive of the pull-in member,

10 shows a variant of FIG. 5,

Fig. 11 is a section along the line Xl-Xl of Fig. 10; and

12 shows a detail of FIG. 2.

1, the drawing-in machine according to the invention consists of a base frame 1 and of various assemblies arranged in it, each of which represents a functional module. A warp beam carriage 2 with a warp beam 3 arranged on it can be seen in front of the base frame 1. The warp beam carriage 3 also contains a lifting device 4 for holding a frame 5 on which the warp threads KF are stretched. This clamping takes place before the actual pulling-in and at a location separate from the drawing-in machine, the frame 5 being positioned at the lower end of the lifting device 4 in the immediate vicinity of the warp beam 3. For pulling in, the warp beam carriage 2 with the warp beam 3 and lifting device 4 is moved to the so-called upgrade side of the pulling-in machine, and the frame 5 is lifted up by the lifting device 4 and suspended in the base frame 1, where it then assumes the position shown.

The frame 5 is displaceable in the longitudinal direction of the base frame 1 by a drive, not shown. During this shifting, the warp threads KF are guided past a thread separation group 6 and are separated and divided in the process. After division, the warp threads KF are cut off and presented to a pull-in needle 7, which forms part of the so-called pull-in module. The thread separation group 6 mentioned is part of the so-called yarn module; it largely corresponds to the device described in EP-A 206 196 for dividing warp threads in knotting machines.

In addition to the pull-in needle 7, a monitor 8 can be seen, which belongs to an operating station and is used to display machine functions and machine malfunctions and for data input. The operating station, which forms part of a so-called programming module, also contains an input stage for the manual input of certain functions, such as crawl gear, start / push, repetition of processes and the like. The drawing-in machine is controlled by a control module containing a control computer, which is arranged in a control box 9. In addition to the control computer, this control box contains a module computer for each so-called main module, the individual module computers being controlled and monitored by the control computer. The main modules of the drawing machine are, in addition to the modules already mentioned, drawing module, yarn module, control module and programming module, the strand, the lamella and the sheet module. The thread separation group 6, which presents the warp threads KF to be drawn in to the pull-in needle 7, and the path of movement of the pull-in needle 7, which runs vertically to the plane of the stretched warp threads KF, determine a plane in the region of a support 10 forming part of the base frame 1

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The already mentioned upgrade side is on this level and on the right of it the so-called disassembly side of the drawing-in machine. The warp threads and the individual elements into which the warp threads are to be fed are fed in on the upgrade side, and the so-called dishes (strands, lamellae and sheets) with the drawn-in warp threads can be removed on the tear-down side. During the drawing in, both the frame 5 with the warp threads KF and the warp beam carriage 2 with the warp beam 3 are moved past the thread separating group 6 to the right, the pulling needle 7 successively removing the warp threads KF stretched on the frame 5.

When all the warp threads KF have been drawn in and the frame 5 is empty, the latter is together with the warp beam carriage 2 and the warp beam 3 on the dismantling side and can be removed from the base frame 1.

Immediately behind the plane of the warp threads KF are the warp thread monitor slats LA, behind them the healds LI and even further behind the reed. The lamellae LA are stacked in hand magazines, and the full hand magazines are hung in inclined feed rails 11, on which they are transported to the right, towards the pull-in needle 7. There they are separated and brought into the feed position. After pulling in, the lamellae LA arrive on lamella support rails 12 on the dismantling side.

The strands LI are lined up on rails 13 and manually or automatically shifted to a separation stage on them. Then the healds LI are individually brought into their retracted position and, after they have been drawn in, are distributed to the corresponding heald frames 14 on the dismantling side. The reed is also gradually moved past the pull-in needle 7, the corresponding leaf tooth being opened for the pull-in. After being drawn in, the sheet is also on the dismantling side. To the right of the heald frames 14 is a part of the reed WB. This illustration is to be understood purely for illustrative purposes, since the reed is of course located on the upgrade page in the position of the frame 5 shown.

As can be seen from the figure, a so-called crockery trolley 15 is provided on the dismantling side. This is inserted together with the slat support rails 12, heald frames 14 and a holder for the reed attached to the base frame 1 in the position shown and carries the dishes with the drawn-in warp threads KF after being drawn in. At this point in time, the warp beam carriage 2 with the warp beam 3 is located directly in front of the harness carriage 15. Now, using the lifting device 4, the dishes are reloaded from the harness carriage 15 onto the warp beam carriage 2, which then carries the warp beam 3 and the pulled-in dishes and to the relevant weaving machine or can be moved to an interim storage facility.

As can be seen from FIG. 2, the main component of the pull-in needle 7 forming the pull-in module is formed by a gripper belt 16 and a clamping gripper 17 carried by the latter, which are guided in a channel-like guide 18 in the lifting direction (arrow P). This extends from the frame 5 in a straight direction to an arcuate end part 18 'and is interrupted in the area of the tableware elements (slats LA, LI and weaving reed WB) in order to feed the tableware elements to the retracted position and to transport them further after the retraction ( Arrow S) to enable. The gripper belt 16 is provided with evenly spaced-apart transport holes 19 and is driven by a motor-driven belt wheel 20, which has knob-shaped projections on its periphery which engage in the transport holes 19.

3 shows, on an enlarged scale of about 3.5: 1, the front end of the gripper belt 16 and the clamp gripper 17 attached to it, which consists of two parts, a gripper hook 17 'and a clamp part 17 ". These two parts are mutually related designed to be resilient, preferably such that the clamping part 17 ″ at its tip is spread away from the gripper hook 17 ′ by approximately 2.5 mm without external force. The warp thread KF to be drawn in is offered to the clamp gripper 17 in such a way that when the clamp gripper is inserted into the thread layer it reaches the gap between the gripper hook 17 'and the clamping part 17 ". As indicated in FIG. 2, the warp thread KF is also in the clamp gripper 17 presented in an inclined position, in such a way that the gripper hook 17 ', which is open at the bottom, presses on the thread from above when it is retracted, so that it slides into the hook mouth by itself. If the clamping gripper 17 now moves out of the thread layer, the warp thread is first of all entrained by the hook, until the clamp gripper 17 enters the guide 18. Then the hook and the gill part are pressed together and the warp thread KF is clamped in. To increase the clamping effect, both parts of the clamp gripper 17 have teeth 21. The clamp gripper 17 is thus formed on its front part, which clamps the warp thread, in the manner of tweezers which are guided by the guide ng 18 is compressed.

The gripper hook 17 'and the clamping part 17 "are made of metal, the gripper band 16 is preferably a carbon fiber band. The gripper hook 17' is longer in the region of its right end in FIG. 3 than the clamping part 17" and has a protruding portion over the clamping part 17 " Partially cylindrical projections, the division of which corresponds to that of the transport holes 19 and the diameter of which is slightly oversized compared to the transport holes 19. The gripper belt 16 is pressed onto these projections with its transport holes 19, as a result of which the connection between the clamping gripper 17 and the gripper belt is established Solvable and has the advantage that if the gripper belt 16 breaks, the clamp gripper 17 can be reused. The two parts of the clamp gripper 17 are connected by spot welding. This results in a sandwich construction. The gripper belt 16 is thinner than the clamp gripper 17

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and thus has lateral play in the guide channel 18, even if the gripper hook and the clamping part are pressed together by the guide channel (see also FIG. 8).

The design of the guide channel 18 can be seen from FIGS. 4 to 8. 4 and 5 show a top view and a front view of the guide channel, Fig. 6 shows a longitudinal section, Fig. 7a to 7c cross-sections along the lines AA (Fig. 5), BB (Fig. 6) and CC ( Fig. 4), all on a scale of 1: 1; and FIG. 8 shows an enlarged detail from FIG. 7c on a 10: 1 scale.

As shown, the guide channel 18 essentially consists of a profile rod 22 made of aluminum or of a suitable plastic, such as, for example, polymethylene oxide, which has a guide groove 23. This is covered on its open side at its edges by two elongated cover rails 24, between which there is a slot 25 for the lateral exit of a warp thread drawn into the guide channel 18. In the base of the guide groove 23 there are clamping jaws 26 which are pressed against the cover rails 24 by springs 27. The clamping jaws 26 are penetrated by stop and guide bolts 28, which ensure that there is a gap between the cover rails 24 and the clamping jaws 26 of such a width that the gripper hooks 17 'and clamping part 17 "are just sufficiently compressed. The profile bar 22 is suitable Carrier 29 is screwed to a bearing block 30 indicated by dash-dotted lines in FIG. 7c.

In the variant shown in FIGS. 10 and 11, the stop and guide bolts 28 are omitted, and clamping jaws 26 'are used which have stops 28' contacting the cover rails 24.

In order to ensure that the thread leaves the guide channel 18 after each insertion through the slot 25, the guide channel 18 has a plurality of interruptions 31, in each of which a thread ejector lever 32 is arranged. These ejector levers 32 can, as can be seen from FIGS. 4 and 5, be formed by downwardly projecting fingers attached to a pneumatically drivable piston, which in their rest position shown in full lines in FIG. 4 lie behind the plane of the gripper belt 16 and to eject the thread in the direction of arrow S (Fig. 2) in the dashed position. Since the lamellae LA, the strands LI and the reed WB are also transported in the direction of the arrow S after the threading in together with the thread to be removed from the guide channel 18, the ejection of the thread is supported by the tableware elements.

Instead of this pneumatically driven, reciprocating thread ejection lever 32, rotating thread ejectors can also be used. In this case, the thread ejectors are designed in the manner of a flywheel and consist of fingers projecting radially from a hub. The hub is mounted on a bearing block fastened to the profiled rod 22 and can be driven by a motor, the fingers dipping into the interruption 31 from above, towards the front against the slot 25

continue to turn and move the thread out of the guide channel 18. In order to ensure that after the thread ejection, the guide channel 18 is free for the next insertion and that, for example, a finger of a thread ejector does not protrude into the guide channel, the individual thread ejectors are monitored by light barriers crossing the plane of movement of the fingers.

FIG. 9 shows a section through the band wheel 20 and through the part of the guide channel which bears against it and which is not covered here by cover rails 24. This is not necessary because the belt wheel 20 presses against the front of the gripper belt 16 and is in engagement with the corresponding transport holes 19 with its knob-shaped projections 33. The knob-shaped projections 33 are hemispherical and have a diameter of 1.5 to 2 mm, preferably 1.8 mm and a pitch of 4 mm.

So that the warp thread can leave guide channel 18 after it has been drawn in, the gripper 17 must first release the thread. This release takes place by a controlled opening of the gripper hook 17 'and clamping part 17 "in the region of the rear stopping point of the clamping gripper 17, which is based on FIG. 2 in the interruption K between the part of the guide channel 18 at the belt wheel 20 and that in the direction of the reed The opening of the clamping gripper 17 takes place in that the part of the guide channel 18 which guides the clamping gripper, that is to say the guide gap between cover rails 24 and clamping jaws 26, is expanded in a funnel shape by appropriate shaping of the clamping jaws, so that the clamping part 17 "of the gripper hook 17 'can spring away. This expansion is preferably in the region of the end of the part of the guide channel 18 which is arranged between the belt wheel and the reed and faces the interruption K.

After the clamp has been released, the thread is now pulled through the interruption K by the hook 17 'until the clamp gripper 17 reaches its rear turning point when entering the part of the guide channel 18 at the belt wheel 20. Even before this reversal point is reached, the thread is pressed onto an adhesive surface by a swivel flap triggered by the clamping gripper 17. This adhesive surface is preferably formed by a rubber ring, which is arranged on the edge of a suction nozzle sucking the thread end.

FIG. 12 shows a detail of the takeover of a warp thread KF by the clamping gripper 17 (FIG. 2). According to the illustration, a sensor is arranged in the plane of movement of the loop-shaped warp thread KF, which checks each time it is pulled in whether a warp thread has really been drawn in. This sensor consists of a resilient sensor bracket 34 with a fixed counterpart 35 which overlap one another. When the thread loop is pulled through the clamping gripper 17 (arrow T), the sensor bracket 34 is pivoted away from the counterpart 35 into the position shown in broken lines, which is indicated by a suitable sensor at 5

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for example by an inductive sensor 36.

The warp thread to be drawn in is therefore under control at all times, which guarantees maximum reliability and operational safety. This inevitably leads to a further increase in the productivity of the pulling-in machine described, which is already increased by the proposed use of a clamping gripper and gripper belt. In addition there is the extremely gentle treatment of the warp threads.

Claims (13)

Claims 1. Device for pulling in warp threads in tableware elements of a weaving machine, with an oscillatingly drivable, needle-shaped pull-in member for the warp threads, characterized in that the pull-in member (7) has a flexible, a gripper (17) carrying gripper belt (16) and that a channel-like Guide (18) is provided for the pull-in member, which is interrupted in the area of the tableware elements (LA, LI, WB) and means (24, 26) for supporting the thread entrainment by the gripper and a slot-like opening (15) for the exit of the retracted Has warp threads from the guide. 2. Device according to claim 1, characterized in that the thread entrainment by clamping and in that said means (24, 26) fix this clamping. 3. Device according to claim 2, characterized in that the guide (18) is formed by a channel (23) adapted to the cross section of the entry member (7), on one side of which elements (26) elastically press against the gripper (17) ) are arranged. 4. The device according to claim 3, characterized in that said elements are formed by clamping jaws (26, 26 ') which are resiliently mounted in the transverse direction of the channel and whose adjustment in said direction is limited by stop means (28, 28'). 5. The device according to claim 4, characterized in that the channel (23) is formed by a groove in a profile bar (22), which on its open side with a slot-like opening (25) for the exit of the drawn warp threads having cover (24) is provided and in the bottom of which the clamping jaws (26) are mounted. 6. The device according to claim 5, characterized in that the channel (23) over its length has interruptions (31), in which transversely to the channel, in the direction of the slot-like opening (25), movable ejection lever (32) for the warp threads are provided. 7. The device according to claim 6, characterized in that the ejecting levers (32) are formed by finger-like organs which can be moved back and forth between two positions in said interruption (31). 8. The device according to claim 6, characterized in that the ejection levers are formed by spoke-shaped organs projecting from a rotatably drivable hub, which are moved periodically into and out of said interruption (31) when the hub rotates, and that means for monitoring the location of the spoke-shaped organs are provided. 9. Device according to one of claims 3 to 8, characterized in that in the region of the rear reversal point of the hook (17) after a warp thread has been drawn in, its clamping is released by the hook. 10. The device according to claim 9, characterized in that the channel (23) has a funnel-shaped widening of its cross-section in said area and that after the passage of the hook (17) by this widening the thread is carried by the hook exclusively by friction. 11. The device according to claim 10, characterized by an adjoining said extension interruption (K) of the channel-like guide (18) and arranged in the area of this interruption elements for the defined takeover of the thread in the region of its end. 12. The device according to claim 11, characterized in that these elements comprise a thread clamp, an adhesive surface for the thread and a suction nozzle. 13. The apparatus according to claim 12, characterized in that the adhesive surface is arranged in the region of the edge of the suction nozzle or forms it. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65