EP1786963B1 - Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads - Google Patents

Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads Download PDF

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Publication number
EP1786963B1
EP1786963B1 EP05778062A EP05778062A EP1786963B1 EP 1786963 B1 EP1786963 B1 EP 1786963B1 EP 05778062 A EP05778062 A EP 05778062A EP 05778062 A EP05778062 A EP 05778062A EP 1786963 B1 EP1786963 B1 EP 1786963B1
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EP
European Patent Office
Prior art keywords
clamping
clamping device
weft
weft threads
clamping force
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP05778062A
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German (de)
French (fr)
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EP1786963A1 (en
Inventor
Jozef Peeters
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Picanol NV
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Picanol NV
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Publication date
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Publication of EP1786963A1 publication Critical patent/EP1786963A1/en
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Publication of EP1786963B1 publication Critical patent/EP1786963B1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/40—Forming selvedges
    • D03D47/48—Forming selvedges by inserting cut end of weft in next shed, e.g. by tucking, by blowing

Definitions

  • the invention relates to a method for clamping weft threads in a weaving machine, which contains at least one weft thread clamping device operable during the weaving operation, as well as a clamping device and a weaving machine equipped with the clamping device.
  • a clamping device for weft threads for a weaving machine is off EP 0284766 A1 known.
  • the clamping force of this clamping device is determined by a spring element whose spring force can be changed by means of adjusting means.
  • the clamping force of the clamping device can be canceled by means of an electric drive motor, which also operates a shot shear.
  • a weft with a predetermined clamping force can be clamped or not clamped. In practice it has been found that such a clamping device is less suitable for weaving certain fabrics, in particular for weaving terry fabrics in which the ends of the weft threads are laid by means of an edge apparatus to insertion edges.
  • EP1 130 145 A1 discloses a method according to the preamble of claim 1.
  • the invention has for its object that terminals of weft threads to perform so that it is suitable for virtually any type of tissue.
  • the inventive method has the advantage that the clamping force of the clamping device is adapted to the tissue to be produced, since it can be changed during weaving.
  • the method can be used to advantage in weaving any type of fabric, and is particularly suitable for use in weaving terry fabrics with ends of the weft yarns inserted to insertion edges.
  • the clamping force is changed depending on a weave pattern of a fabric to be created.
  • the weave pattern is determined over several weft cycles as a function of the angular position of the main drive shaft, taking into account weft patterns and / or weave patterns and / or one or more other patterns that are part of the weave pattern.
  • the method according to the invention comprises inserting at least one end of a tarnished weft thread into a subsequent shed and changing the clamping force of the clamping device according to a pattern that can be adjusted in response to the insertion of the at least one end of the tarnished weft thread.
  • a method is advantageously used when jointly inserting a plurality of weft thread ends of successively struck weft threads in a subsequent shed. As a result, the ends of the weft threads can also be inserted regularly at the fabric edge.
  • the change of the clamping force in response to a pattern, according to which the ends of a group of weft threads are inserted together in a formed after striking the last weft thread of this group shed is particularly suitable for weaving terry fabrics.
  • a pneumatically operating device for changing the clamping force is provided.
  • the device includes a pneumatic cylinder and a valve unit.
  • the clamping force can be changed by changing the pressure of the compressed air.
  • the clamping device according to the invention at the same time comprises an edge apparatus for introducing an end of a damaged weft thread, which was clamped in the clamping device, in a subsequent shed.
  • the clamping device is controlled so that one end of a weft thread can be optimally inserted into a subsequent shed.
  • the clamping device according to the invention is particularly advantageous if it is used in weaving fabrics in which several ends of groups of weft threads are inserted from an edge apparatus together in a subsequent shed.
  • this weaving machine includes a clamping device, which is arranged between a shot shear and an edge of the tissue to be created, and / or a clamping device which is arranged between a waste scissors and an edge of the tissue to be created.
  • the weaving machine further includes an edging apparatus for threading the ends of a weft thread which had been clamped in the clamping device into a subsequent shed appeal.
  • a pneumatic edge apparatus is provided.
  • the pneumatic edge apparatus is placed between tissue and clamping device.
  • a pneumatic edge apparatus is particularly suitable for working together with a clamping device according to the invention.
  • the clamping device is arranged in an area in which it does not clamp completely damaged weft threads.
  • the clamping force is reduced or canceled when a weft yarn is completely struck so that the not fully damaged weft threads can be easily taken.
  • the clamping device is designed and / or arranged such that it detects only not completely damaged weft threads. It then suffices to reduce the clamping force when striking the fully damaged weft thread so far that with this weft thread the previously entered, not completely damaged weft threads can be taken, which then leave the clamping device during full stop and inserted from the edge apparatus in a subsequent shed can be.
  • Fig. 1 schematically a weaving machine is shown, which contains two clamping devices 1, 2 according to the invention.
  • the clamping device 1 is mounted between a fabric 3 and a weft cutter 4, which cuts off a registered weft thread 5 from a thread supply 6.
  • the further clamping device 2 is mounted between the fabric 3 and a waste scissors 7, with the excess end 8 of a registered weft thread 5 is cut off.
  • the end 9 of the weft thread 5, which projects beyond the edge 10 of the fabric 3 on the entry side, is clamped by means of the clamping device 1 and then inserted by means of an edge apparatus 11 in a subsequent shed.
  • the other end 12 of this weft thread 5, which projects beyond the opposite edge 13 of the fabric 3, is clamped by means of the clamping device 2 and later inserted by means of an edge apparatus 14 in the subsequent shed.
  • the clamping devices 1, 2 are - viewed in the direction of the warp threads 16 - arranged at a distance from a stop line 15, so that each clamping device 1, 2 not completely damaged weft thread 5, ie a not posted to the stop line 15 Weft 5, can pinch.
  • Stop line 15 is here understood to mean the line at which a reed 17 completely strikes a weft thread 5 on the fabric 3, the so-called edge of the fabric.
  • weaving machine which is for example an air-jet loom, contains warp threads 16, which are formed in a known manner with shedding means successive looms, are registered in the weft threads 5.
  • the reed 17 contains in a known manner profiled blades which have a U-shaped recess to form a weft yarn guide channel. Furthermore, the weaving machine has at least one main nozzle 18 to register the weft threads in the looms formed from the warp threads 16.
  • clamping device 1 includes a means 20 for adjusting the clamping force, which can exert the clamping device 1 on a weft thread 5.
  • the device 20 is controlled by a control unit 21, which is for example the control unit of the loom.
  • the device 20 includes a pneumatic cylinder 22 which cooperates with a movably mounted clamping part 30 of the clamping device 1. Further, the device includes a valve unit 23, with which the pressure of the compressed air arriving at the compressed air cylinder 22 can be adjusted.
  • the compressed air is supplied by a compressed air source 24.
  • the clamping force of the mechanical clamping device 1 is exerted on the weft threads 5 between the lower edge of the movably mounted clamping part 30 and the upper edge of a clamping part 31, which is fixedly mounted on the clamping part 30.
  • the clamping parts 30 and 31 are preferably at the point of a wear-resistant material to which they weft weft threads 5.
  • a pneumatic device for example a pneumatic cylinder 22, which can press the clamping parts 30 and 31 against each other.
  • the illustrated air cylinder 22 is single-acting, ie it is operated in one direction (preferably the clamping direction) via compressed air and returned in the other direction by means of a return spring 34.
  • a double-acting compressed air cylinder is provided, ie a compressed air cylinder which is actuated in both directions by means of compressed air.
  • a valve unit 23 is used to obtain the desired pressure of the compressed air.
  • the valve unit 23 consists in the illustrated embodiment of an electrically controllable pressure regulator 32 and an electrically operated 3/2-way valve 33. With the pressure regulator 32, the desired pressure of the compressed air and thus the desired clamping force can be adjusted.
  • the compressed air In a first position of the 3/2-way valve 33, the compressed air to the compressed air cylinder 22, so that a clamping force on the clamping parts 30, 31 is applied.
  • no compressed air reaches the compressed air cylinder 22, which is vented via the 3/2-way valve 33, so that the clamping members 30, 31 are moved apart from the return spring 34 of the air cylinder 22, so that no clamping force between the clamping parts 30, 31 is applied.
  • a stop 35 is provided, which is for example adjusted so that the clamping member 30 can only move so far that there is a gap of 0.5 mm between the clamping members 30, 31.
  • the pressure regulator 32 is a proportional pressure regulator that communicates compressed air at a pressure corresponding to the magnitude of the voltage applied to the pressure regulator 32.
  • the control unit 21 outputs an electrical signal with a suitable voltage to the pressure regulator 32, in order to set in this way the desired pressure of the compressed air and thus the desired clamping force or the desired course of the clamping force of the clamping device 1 between the clamping parts 30 and 31.
  • the compressed air cylinder, a plurality of pressure regulator 32 and 3/2-way valves 33 associated with the pressure regulator are each set to a defined pressure of the compressed air.
  • a respective 3/2-way valve 33 which is connected to a pressure regulator 32 set to the desired pressure, is driven in each case.
  • a compressed air system which generates compressed air at a desired pressure and contains, for example, inter alia, throttle valves.
  • the movable clamping member 30 is fixed by means of screws 42 to an arm 43 which is held by means of a hinge 36 to a holder 37 which is fixed to the loom.
  • the movable clamping member 30 can thus pivot about the hinge 36 whose axis is transverse to the impression cylinder 22.
  • the impression cylinder 22 engages the arm 43 at a location intermediate between the pivot 36 and the location of the clamp member 30 which clamps a weft.
  • the weft cutter 4 is additionally attached.
  • the shot shear 4 has a fixed shear blade 38 and a movably mounted shear blade 39.
  • the movably mounted shear blade 39 is arranged on a drive shaft 40 of a drive motor 41.
  • the permanently mounted clamping part 31 is by means of screws 44 at and mounted adjacent to the fixed shear blade 38.
  • the upper edge of the clamping member 31 and the upper edge of the shear blade 38 are substantially in one plane.
  • the drive shaft 40 extends parallel to the weft direction and to the axis of the joint 36.
  • the clamping device 2 is preferably carried out in the same way and designed as the clamping device 1.
  • the waste scissors 7 is also performed in the same manner as the shot shear 4 and attached together with corresponding clamping members 30, 31 and a corresponding air cylinder 22 to a corresponding holder 37.
  • the weaving machine includes an edge apparatus 11 which is disposed adjacent to the edge 10 of the fabric between the clamping device 1 and the fabric 3.
  • the edge apparatus 11 has a blowing device 27 accommodated in a holder for inserting the end 9 of a registered weft thread 5 into a subsequently formed shed.
  • the blowing device 27 has a nozzle 28, which is arranged in the region of a groove of the holder, which serves to guide a weft thread. Further, it has at least one blowing nozzle 29 on the side of the holder.
  • the blowing device 27 is connected via a valve unit 25 with a compressed air source, for example, the compressed air source 24 of Fig. 2 ,
  • the blowing device 27 is arranged in the vicinity of the stop line 15.
  • the valve unit 25 is actuated at suitable time intervals by a control unit, for example the control unit 21, in order to blow one end 9 of a weft thread 5 into a shed subsequently formed after the insertion of this weft thread 5.
  • the blowing device 27 and the valve unit 25, which are part of the edge apparatus 11, for example, can be carried out in the same manner as that in the patent application WO 01/86047 is described.
  • the arranged on the opposite side of the fabric 3 edge apparatus 14 ( Fig. 1 ) is, for example, the same design as the edge apparatus 11.
  • the devices work as follows. After the insertion of the weft thread 5, it is displaced by the reed 17 in the direction of the warp threads 16. The end 9 of the weft thread 5 passes in this way between the clamping parts 30, 31 of the clamping device 1. With this displacement (striking), the end 9 of the weft thread 5 is also introduced into the edge apparatus 11. Subsequently, the weft thread 5 is cut off from the thread supply 6 by means of the weft cutter 4 ( Fig. 3 ). The end 9 of the weft thread 5 is still in the clamping device 1 after cutting, while the reed 17 and the main nozzle 18 with the sley again move from the stop line 15 away.
  • the clamping force of the clamping device 1 is reduced or canceled, after which the blowing device 27 of the edge apparatus 11, the end 9 in a subsequent shed blows ( Fig. 4 ).
  • the following weft thread 5 is entered ( Fig. 4 ).
  • the following weft thread 5 is then taken along with the injected end 9 of the previously inserted weft thread 5 of the reed 17 and struck ( Fig. 5 ). In this way, creates a fabric 3 with an inserted edge 26.
  • the end 12 of the weft thread is clamped by means of the clamping device 2, cut off by means of the garbage shears 7 and inserted by means of the edge apparatus 14 in the subsequent shed.
  • the clamping force of the clamping device 1 and / or the clamping device 2 is changed according to a criterion, in particular a pattern of the fabric 3, which is determined as a function of the fabric 3 to be produced.
  • the clamping force of the clamping device 1 and / or 2 can be controlled according to a weave pattern that depends on the pattern of the fabric 3 to be produced.
  • the weave pattern is determined depending on the angular position of the main drive shaft of the loom and though over several firing cycles away.
  • the dependency is determined by a weft pattern, a weave pattern, or another pattern that is part of the weave pattern.
  • the clamping force is changed during weaving according to a pattern.
  • the invention is particularly suitable for use in weaving terry fabrics, in which ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • ends 9 and 12 of the weft threads 5 are inserted into the fabric.
  • the weft threads 5 of a group for example, two weft threads, entered one after the other and struck in each case at a position 19 which is at a significant distance from the stop line 15 and which is for example referred to as Voranschlagposition 19.
  • the clamping device 1 and the clamping device 2, not shown, are arranged so that they can clamp the ends 9 and 12 of the weft threads 5 already when the weft threads 5 are in the Voranschlagposition 19, ie. In a position at a distance from the stop line 15.
  • the clamping devices 1 and 2 must be able to clamp a weft thread 5, if this is in a position before the stop line 15 and is not always woven with full stop.
  • the ends of the weft threads of this group in the embodiment of three weft threads, are then struck together with the last inserted weft thread on the stop line 15, ie it is a full stop executed.
  • the ends 9 and 12 of the group of weft yarns are simultaneously inserted into a subsequent shed, as in Fig. 8 shown is, ie in a shed, which is formed after the full stop.
  • the ends 9 and 12 of the group of weft yarns In order for the ends 9 and 12 of the group of weft yarns to be inserted together by means of an edge apparatus 11 or 14, the ends 9 or 12 must be accurately positioned to the edge apparatus 11 or 14 prior to loading. It is advantageous if the clamping force of the clamping devices 1 or 2 is changed according to a predetermined pattern, since the ends 9 or 12 are cut off after each weft insertion and the ends 9 or 12 after cutting in the desired position with a desired clamping force of the Clamping device 1 or 2 to be kept.
  • the ends 9 and 12 of the weft yarns 5, which are struck to the preliminary stop, are clamped with a relatively high clamping force in the clamping devices 1 and 2 in order to keep them safe.
  • the clamping force of the clamping devices 1 and 2 is reduced so that the ends 9 and 12 of the previously registered weft threads together with the ends 9 and 12 of the last weft inserted, which is struck with the full stop, between the clamping parts 30, 31 of Clamping devices 1 and 2 can slide. If the clamping force would be kept too high at the full stop, there is a risk that the already clamped ends 9 and 12 are damaged in the subsequent full stop, since the ends 9 and 12 are pulled through the clamping devices 1 and 2.
  • the clamping force of the clamping device 1 and 2 is controlled according to a pattern in which the clamping force is relatively large at the preliminary stop and the clamping force is relatively low at full stop, there is the advantage that the ends of the weft threads are held sufficiently after each estimate, but will not be damaged in the subsequent full stop.
  • the clamping force is controlled, for example, according to the weft pattern and in detail according to the Pol Struktursmuster - also known as terry - - the fabric to be produced.
  • a three-weft poling pattern is mentioned.
  • a Pol Struktursmuster with a different number of wefts can be selected, for example, a Pol Struktursmuster in which three consecutive weft threads are struck up to an estimate, then followed by a weft with a full stop. In this case, the clamping force in the first three weft entries becomes large and low in the following weft insertion.
  • combinations of different Pol Struktursmuster are possible.
  • each weft thread 5 can be inserted by means of the edge apparatuses 11 or 14 individually in a subsequent shed.
  • the clamping devices 1 and / or 2 remain open, i. be driven so that they exert no clamping force on the ends 9 and / or 12 of the weft threads.
  • the pattern of the fabric to be produced is determined by the control unit 21 of the weaving machine as a function of the angular position of the main drive shaft of the loom.
  • the ends 9 and 12 it may be desirable to have the ends 9 and 12 to keep the weft threads clamped with a very large clamping force. This offers the advantage that the weft threads clamped in this way do not spring back after cutting off and do not lead to a contraction of the fabric. If the weft threads are held very well, so the warp threads can be placed well around the weft thread at the edge of the goods so that they form a good edge of the goods.
  • the clamping force of the clamping devices 1 and / or 2 is initially set relatively low. After insertion, the clamping force is then increased again. According to the invention, the clamping force is changed after the firing cycle and in particular according to the angular position of the main drive shaft or after a time course, which relates to the angular position of the main drive shaft of the loom, that the clamping force during insertion of the ends 9 and / or 12 of the weft threads.
  • the clamping force of the clamping device 1 and / or 2 is also changed depending on the inserted weft thread 5 and in particular on the type of weft thread to be introduced. For example, for a thin weft chosen a larger clamping force, as for a thicker weft. If the same clamping forces are to be obtained for thick and thin weft threads, the spacing of the clamping parts for thicker weft threads will normally be greater than for thinner weft threads. The adjustment is made according to the pattern. In another embodiment, the clamping force is adjusted and / or changed according to the weave pattern. If the binding is formed with the same number of warp threads at the top and at the bottom, the clamping force is set to relatively low values, for example. In contrast, if there is a considerable difference between the number of warp threads of the top and bottom, the clamping force is chosen and set relatively large.
  • the clamping force can be changed except in dependence on the weft pattern, the angular position of the main drive shaft, the terry, the Bordürenweb, other parameters of the fabric to be produced and combinations of the above parameters of the fabric to be produced, for example, depending on the warp tension, the weft tension , the pole height of the loops of the terry tissue, the angular position of the main drive shaft, a time course, or depending on results of measurements made during weaving.
  • the desired course of the clamping force is determined depending on the angular position of the main drive shaft of the loom and adjusted according to the angular position respectively. For example, when it is desired to weave a terry fabric having twenty rows of three wefts within a loop, ten tiers of four wefts within a loop, twenty rows of three wefts within a loop, and a flat weft of ten wefts, exists the weave pattern from 170 weft entries. For each weft insertion a course of the clamping force in conjunction with the angular position of the main drive shaft is determined and stored. For each individual weft insertion in the production of the fabric clamping force is then adjusted according to the associated angular position of the main shaft of the loom. This measure is referred to as weaving pattern of the fabric to be produced.
  • FIGS. 9 and 10 In the weaving of a terry cloth and in particular in the weaving of a terry cloth with inserted ends of the weft threads, it may be advantageous to a device accordingly FIGS. 9 and 10 to use.
  • the clamping device 1 is mounted in such a position that it cooperates with one end 9 of a partially damaged weft thread 5, ie with a weft thread 5, which is struck up to the Voranschlagposition 19.
  • the clamping device 1 is further arranged so that it does not act on a completely damaged weft yarn, ie on a weft which has been struck against the stop line 15.
  • the clamping parts 30 and 31 of the clamping device 1 are arranged and designed so that they do not cooperate in the area in front of the stop line 15, ie perform no clamping action.
  • the clamping device 1 is provided with a recess 45 in the region of the clamping parts 30 and 31.
  • This embodiment allows, for example, Fig. 9 ) to clamp two ends 9 of a weft thread 5 which have been struck up to the preliminary stop 19. These two ends 9 are then taken at a full stop for the third, subsequently introduced weft thread by means of the reed 17 to the region of the recess 45, as shown in Fig. 10 is shown.
  • clamping devices 1 and 2 and the associated shot shear 4 and the litter shears 7 can be arranged closer to the fabric 3.
  • the parameters of a tissue to be produced can still be determined in other ways. They do not necessarily have to be determined from the weave pattern described above.
  • the weave pattern may also include other parameters. In most cases, the weave pattern is determined depending on the weft threads to be entered. However, the weave pattern may also be determined depending on successive positions of the warp threads or in some other known manner.
  • the change in the clamping force is usually connected to an actual relative movement of the clamping parts 30 and 31 to each other. However, if, for example, a substantially unyielding weft thread is clamped between the clamping parts 30 and 31, a change in the clamping force will not necessarily lead to a relative movement of the clamping parts 30, 31 to each other. A relative movement between the clamping parts 30 and 31 of the clamping device 1 or 2 when changing the clamping force will, however, take place when an elastic weft thread is clamped.
  • the invention is not limited to an application of air jet looms. Rather, it can be used in any type of loom, for example rapier looms, rapier looms, water jet looms, projectile looms, multiphase looms and weaving rotors, and other types of weaving machines.
  • the device according to the invention, the weaving machine according to the invention and the method according to the invention are not limited to the embodiments described by way of example only.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Klemmen von Schussfäden bei einer Webmaschine, die wenigstens eine während des Webvorgangs betätigbare Klemmvorrichtung für Schussfäden enthält, sowie eine Klemmvorrichtung und eine mit der Klemmvorrichtung ausgerüstete Webmaschine.The invention relates to a method for clamping weft threads in a weaving machine, which contains at least one weft thread clamping device operable during the weaving operation, as well as a clamping device and a weaving machine equipped with the clamping device.

Eine Klemmvorrichtung für Schussfäden für eine Webmaschine ist aus EP 0284766 A1 bekannt. Die Klemmkraft dieser Klemmvorrichtung wird von einem Federelement bestimmt, dessen Federkraft mithilfe von Einstellmitteln verändert werden kann. Die Klemmkraft der Klemmvorrichtung kann mittels eines elektrischen Antriebsmotors aufgehoben werden, der auch eine Schussschere betätigt. Mittels der bekannten Klemmvorrichtung kann ein Schussfaden mit einer vorgegebenen Klemmkraft geklemmt oder nicht geklemmt werden. In der Praxis hat sich gezeigt, dass eine derartige Klemmvorrichtung beim Weben bestimmter Gewebe weniger geeignet ist, insbesondere beim Weben von Frottiergeweben, bei welchen die Enden der Schussfäden mittels eines Kantenapparates zu Einlegekanten eingelegt werden. EP1 130 145 A1 offenbart ein Verfahren gemäβ dem Oberbegriff des Anspruchs 1.A clamping device for weft threads for a weaving machine is off EP 0284766 A1 known. The clamping force of this clamping device is determined by a spring element whose spring force can be changed by means of adjusting means. The clamping force of the clamping device can be canceled by means of an electric drive motor, which also operates a shot shear. By means of the known clamping device, a weft with a predetermined clamping force can be clamped or not clamped. In practice it has been found that such a clamping device is less suitable for weaving certain fabrics, in particular for weaving terry fabrics in which the ends of the weft threads are laid by means of an edge apparatus to insertion edges. EP1 130 145 A1 discloses a method according to the preamble of claim 1.

Der Erfindung liegt die Aufgabe zugrunde, dass Klemmen von Schussfäden so auszuführen, dass es praktisch für jede Art von Gewebe geeignet ist.The invention has for its object that terminals of weft threads to perform so that it is suitable for virtually any type of tissue.

Diese Aufgabe wird durch ein Verfahren gemäβ Anspruch 1 gelöst.This object is achieved by a method according to claim 1.

Das erfindungsgemäße Verfahren hat den Vorteil, dass die Klemmkraft der Klemmvorrichtung an das herzustellende Gewebe angepasst ist, da sie während des Webens geändert werden kann. Das Verfahren kann beim Weben jeder Gewebeart vorteilhaft angewendet werden und ist besonders für die Anwendung beim Weben von Frottiergeweben mit zu Einlegekanten eingelegten Enden der Schussfäden geeignet.The inventive method has the advantage that the clamping force of the clamping device is adapted to the tissue to be produced, since it can be changed during weaving. The method can be used to advantage in weaving any type of fabric, and is particularly suitable for use in weaving terry fabrics with ends of the weft yarns inserted to insertion edges.

Bei einer bevorzugten Ausführungsform wird die Klemmkraft in Abhängigkeit von einem Webmuster eines zu erstellenden Gewebes geändert. Dabei wird das Webmuster über mehrere Schusszyklen als Funktion der Winkelposition der Hauptantriebswelle bestimmt, unter Berücksichtigung von Schussmuster und / oder Bindungsmuster und / oder eines oder mehrerer anderer Muster, die Teil des Webmusters sind.In a preferred embodiment, the clamping force is changed depending on a weave pattern of a fabric to be created. The weave pattern is determined over several weft cycles as a function of the angular position of the main drive shaft, taking into account weft patterns and / or weave patterns and / or one or more other patterns that are part of the weave pattern.

Gemäß einer bevorzugten Ausführungsform umfasst das erfindungsgemäße Verfahren das Einbringen von mindestens einem Ende eines angeschlagenen Schussfadens in ein nachfolgendes Webfach und das Ändern der Klemmkraft der Klemmvorrichtung entsprechend einem Muster, das in Abhängigkeit vom Einlegen des mindestens einen Endes des angeschlagenen Schussfadens eingestellt werden kann. Ein solches Verfahren wird vorteilhaft beim gemeinsamen Einlegen mehrerer Schussfadenenden von aufeinander folgend angeschlagenen Schussfäden in ein nachfolgendes Webfach verwendet. Dadurch können die Enden der Schussfäden auch regelmäßig an der Gewebekante eingelegt werden.According to a preferred embodiment, the method according to the invention comprises inserting at least one end of a tarnished weft thread into a subsequent shed and changing the clamping force of the clamping device according to a pattern that can be adjusted in response to the insertion of the at least one end of the tarnished weft thread. Such a method is advantageously used when jointly inserting a plurality of weft thread ends of successively struck weft threads in a subsequent shed. As a result, the ends of the weft threads can also be inserted regularly at the fabric edge.

Gemäß einer Ausgestaltung der Erfindung erfolgt die Änderung der Klemmkraft in Abhängigkeit von einem Muster, gemäß welchem die Enden einer Gruppe von Schussfäden gemeinsam in ein nach einem Anschlagen des letzten Schussfadens dieser Gruppe gebildetes Webfach eingelegt werden. Diese Ausgestaltung ist insbesondere für das Weben von Frottiergeweben geeignet.According to one embodiment of the invention, the change of the clamping force in response to a pattern, according to which the ends of a group of weft threads are inserted together in a formed after striking the last weft thread of this group shed. This embodiment is particularly suitable for weaving terry fabrics.

Weiter wird die Aufgabe erfindungsgemäß mit einer Klemmvorrichtung gemäβ Anspruch 8 gelöst.Further, the object is achieved according to the invention with a clamping device according to claim 8.

Gemäß einer bevorzugten Ausführungsform ist eine pneumatisch arbeitende Einrichtung zum Ändern der Klemmkraft vorgesehen. Vorzugsweise enthält die Einrichtung einen Druckluftzylinder und eine Ventileinheit. Die Klemmkraft kann durch Ändern des Drucks der Druckluft geändert werden.According to a preferred embodiment, a pneumatically operating device for changing the clamping force is provided. Preferably, the device includes a pneumatic cylinder and a valve unit. The clamping force can be changed by changing the pressure of the compressed air.

Gemäß einer bevorzugten Ausführungsform umfasst die erfindungsgemäße Klemmvorrichtung gleichzeitig einen Kantenapparat, um ein Ende eines angeschlagenen Schussfadens, das in der Klemmvorrichtung geklemmt war, in ein nachfolgendes Webfach einzubringen. Dabei wird die Klemmvorrichtung so gesteuert, dass ein Ende eines Schussfadens optimal in ein nachfolgendes Webfach eingelegt werden kann. Die erfindungsgemäße Klemmvorrichtung ist vor allem vorteilhaft, wenn sie beim Weben von Geweben eingesetzt wird, bei denen mehrere Enden von Gruppen von Schussfäden von einem Kantenapparat gemeinsam in ein nachfolgendes Webfach eingelegt werden.According to a preferred embodiment, the clamping device according to the invention at the same time comprises an edge apparatus for introducing an end of a damaged weft thread, which was clamped in the clamping device, in a subsequent shed. In this case, the clamping device is controlled so that one end of a weft thread can be optimally inserted into a subsequent shed. The clamping device according to the invention is particularly advantageous if it is used in weaving fabrics in which several ends of groups of weft threads are inserted from an edge apparatus together in a subsequent shed.

Die Aufgabe wird weiter mit einer Webmaschine gelöst, die mit einer erfindungsgemäßen Klemmvorrichtung ausgerüstet ist. Vorteilhaft enthält diese Webmaschine eine Klemmvorrichtung, die zwischen einer Schussschere und einer Kante des zu erstellenden Gewebes angeordnet ist, und / oder eine Klemmvorrichtung, die zwischen einer Abfallschere und einer Kante des zu erstellenden Gewebes angeordnet ist.The object is further achieved with a loom, which is equipped with a clamping device according to the invention. Advantageously, this weaving machine includes a clamping device, which is arranged between a shot shear and an edge of the tissue to be created, and / or a clamping device which is arranged between a waste scissors and an edge of the tissue to be created.

Bei einer bevorzugten Ausführungsform enthält die Webmaschine zudem einen Kantenapparat, um die Enden eines Schussfadens, die in der Klemmvorrichtung geklemmt worden waren, in ein nachfolgendes Webfach einzulegen. Bevorzugt wird ein pneumatischer Kantenapparat vorgesehen. Der pneumatische Kantenapparat wird zwischen Gewebe und Klemmvorrichtung angeordnet. Ein pneumatischer Kantenapparat ist besonders geeignet, um mit einer erfindungsgemäßen Klemmvorrichtung zusammen zu arbeiten.In a preferred embodiment, the weaving machine further includes an edging apparatus for threading the ends of a weft thread which had been clamped in the clamping device into a subsequent shed appeal. Preferably, a pneumatic edge apparatus is provided. The pneumatic edge apparatus is placed between tissue and clamping device. A pneumatic edge apparatus is particularly suitable for working together with a clamping device according to the invention.

In Ausgestaltung der Erfindung wird vorgesehen, dass die Klemmvorrichtung in einem Bereich angeordnet ist, in welchem sie nicht vollständig angeschlagene Schussfäden klemmt. Dabei wird die Klemmkraft reduziert oder aufgehoben, wenn ein Schussfaden vollständig angeschlagen wird, so dass die nicht voll angeschlagenen Schussfäden leicht mitgenommen werden können. Alternativ ist die Klemmvorrichtung derart ausgebildet und / oder derart angeordnet, dass sie nur nicht vollständig angeschlagene Schussfäden erfasst. Es genügt dann, beim Anschlagen des vollständig angeschlagenen Schussfadens die Klemmkraft soweit zu reduzieren, dass mit diesem Schussfaden die vorher eingetragenen, nicht vollständig angeschlagenen Schussfäden mitgenommen werden können, die dann während des vollständigen Anschlagens die Klemmvorrichtung verlassen und von dem Kantenapparat in ein nachfolgendes Webfach eingelegt werden können.In an embodiment of the invention, it is provided that the clamping device is arranged in an area in which it does not clamp completely damaged weft threads. The clamping force is reduced or canceled when a weft yarn is completely struck so that the not fully damaged weft threads can be easily taken. Alternatively, the clamping device is designed and / or arranged such that it detects only not completely damaged weft threads. It then suffices to reduce the clamping force when striking the fully damaged weft thread so far that with this weft thread the previously entered, not completely damaged weft threads can be taken, which then leave the clamping device during full stop and inserted from the edge apparatus in a subsequent shed can be.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in den Zeichnungen dargestellten Ausführungsformen.

Fig. 1
zeigt in schematischer Darstellung einen Teil einer erfindungsgemäßen Webmaschine,
Fig. 2
eine erfindungsgemäße Klemmvorrichtung,
Fig. 3
einen vergrößerten Ausschnitt der Fig. 1 in einer ersten Position eines Webzyklus,
Fig. 4
den Ausschnitt entsprechend Fig. 3 in einer weiteren Position des Webzyklus,
Fig. 5
den Ausschnitt der Fig. 3 in einer weiteren Position des Webzyklus,
Fig. 6 bis 8
Ausschnitte ähnlich Fig. 3 in verschiedenen Positionen eines Webzyklus beim Erstellen eines Gewebes nach einem anderen Webmuster und
Fig. 9 und 10
eine Einzelheit einer Klemmvorrichtung ähnlich Fig. 2 in einer abgewandelten Ausführungsform.
Further features and advantages of the invention will become apparent from the following description of the embodiments illustrated in the drawings.
Fig. 1
shows a schematic representation of a part of a weaving machine according to the invention,
Fig. 2
a clamping device according to the invention,
Fig. 3
an enlarged section of the Fig. 1 in a first position of a weaving cycle,
Fig. 4
the cutout accordingly Fig. 3 in another position of the weaving cycle,
Fig. 5
the clipping of the Fig. 3 in another position of the weaving cycle,
Fig. 6 to 8
Clippings similar Fig. 3 in different positions of a weaving cycle when creating a fabric according to a different weaving pattern and
FIGS. 9 and 10
a detail of a clamping device similar Fig. 2 in a modified embodiment.

In Fig. 1 ist schematisch eine Webmaschine dargestellt, die zwei erfindungsgemäße Klemmvorrichtungen 1, 2 enthält. Die Klemmvorrichtung 1 ist zwischen einem Gewebe 3 und einer Schussschere 4 montiert, die einen eingetragenen Schussfaden 5 von einem Fadenvorrat 6 abschneidet. Die weitere Klemmvorrichtung 2 ist zwischen dem Gewebe 3 und einer Abfallschere 7 montiert, mit der das überschüssige Ende 8 eines eingetragenen Schussfadens 5 abgeschnitten wird. Das Ende 9 des Schussfadens 5, das über die Kante 10 des Gewebes 3 auf der Eintragsseite hinausragt, wird mittels der Klemmvorrichtung 1 geklemmt und anschließend mittels eines Kantenapparates 11 in ein nachfolgendes Webfach eingelegt. Das andere Ende 12 dieses Schussfadens 5, das über die gegenüberliegende Kante 13 des Gewebes 3 hinausragt, wird mittels der Klemmvorrichtung 2 geklemmt und später mittels eines Kantenapparates 14 in das nachfolgende Webfach eingelegt.In Fig. 1 schematically a weaving machine is shown, which contains two clamping devices 1, 2 according to the invention. The clamping device 1 is mounted between a fabric 3 and a weft cutter 4, which cuts off a registered weft thread 5 from a thread supply 6. The further clamping device 2 is mounted between the fabric 3 and a waste scissors 7, with the excess end 8 of a registered weft thread 5 is cut off. The end 9 of the weft thread 5, which projects beyond the edge 10 of the fabric 3 on the entry side, is clamped by means of the clamping device 1 and then inserted by means of an edge apparatus 11 in a subsequent shed. The other end 12 of this weft thread 5, which projects beyond the opposite edge 13 of the fabric 3, is clamped by means of the clamping device 2 and later inserted by means of an edge apparatus 14 in the subsequent shed.

Die Klemmvorrichtungen 1, 2 sind - in Richtung der Kettfäden 16 gesehen - in einem Abstand von einer Anschlaglinie 15 angeordnet, so dass jede Klemmvorrichtung 1, 2 einen nicht vollständig angeschlagenen Schussfaden 5, d.h. einen nicht an die Anschlaglinie 15 angeschlagenen Schussfaden 5, klemmen kann. Unter Anschlaglinie 15 wird hierbei die Linie verstanden, an der ein Webblatt 17 einen Schussfaden 5 vollständig an dem Gewebe 3, dem sogenannten Warenrand, anschlägt. Die in Fig. 1 dargestellte Webmaschine, die beispielsweise ein Luftdüsenwebmaschine ist, enthält Kettfäden 16, mit denen in bekannter Weise mit Fachbildungsmitteln aufeinander folgende Webfächer gebildet werden, in die Schussfäden 5 eingetragen werden. Das Webblatt 17 enthält in bekannter Weise Profillamellen, die eine U-förmige Aussparung aufweisen, um einen Schussfadenführungskanal zu bilden. Weiterhin besitzt die Webmaschine wenigstens eine Hauptdüse 18, um die Schussfäden in die aus den Kettfäden 16 gebildeten Webfächer einzutragen.The clamping devices 1, 2 are - viewed in the direction of the warp threads 16 - arranged at a distance from a stop line 15, so that each clamping device 1, 2 not completely damaged weft thread 5, ie a not posted to the stop line 15 Weft 5, can pinch. Stop line 15 is here understood to mean the line at which a reed 17 completely strikes a weft thread 5 on the fabric 3, the so-called edge of the fabric. In the Fig. 1 illustrated weaving machine, which is for example an air-jet loom, contains warp threads 16, which are formed in a known manner with shedding means successive looms, are registered in the weft threads 5. The reed 17 contains in a known manner profiled blades which have a U-shaped recess to form a weft yarn guide channel. Furthermore, the weaving machine has at least one main nozzle 18 to register the weft threads in the looms formed from the warp threads 16.

Die in Fig. 2 dargestellte Klemmvorrichtung 1 enthält eine Einrichtung 20 zum Einstellen der Klemmkraft, die die Klemmvorrichtung 1 auf einen Schussfaden 5 ausüben kann. Die Einrichtung 20 wird von einer Steuereinheit 21 gesteuert, die beispielsweise die Steuereinheit der Webmaschine ist. Die Einrichtung 20 enthält einen Druckluftzylinder 22, der mit einem beweglich montierten Klemmteil 30 der Klemmvorrichtung 1 zusammen wirkt. Ferner enthält die Einrichtung eine Ventileinheit 23, mit der der an dem Druckluftzylinder 22 ankommende Druck der Druckluft eingestellt werden kann. Die Druckluft wird von einer Druckluftquelle 24 geliefert. Die Klemmkraft der mechanischen Klemmvorrichtung 1 wird zwischen der Unterkante des beweglich montierten Klemmteils 30 und der Oberkante eines dem Klemmteil 30 gegenüber liegenden, fest montierten Klemmteils 31 auf die Schussfäden 5 ausgeübt. Die Klemmteile 30 und 31 sind vorzugsweise an der Stelle aus einem verschleißfesten Werkstoff, an welcher sie Schussfäden 5 klemmen.In the Fig. 2 illustrated clamping device 1 includes a means 20 for adjusting the clamping force, which can exert the clamping device 1 on a weft thread 5. The device 20 is controlled by a control unit 21, which is for example the control unit of the loom. The device 20 includes a pneumatic cylinder 22 which cooperates with a movably mounted clamping part 30 of the clamping device 1. Further, the device includes a valve unit 23, with which the pressure of the compressed air arriving at the compressed air cylinder 22 can be adjusted. The compressed air is supplied by a compressed air source 24. The clamping force of the mechanical clamping device 1 is exerted on the weft threads 5 between the lower edge of the movably mounted clamping part 30 and the upper edge of a clamping part 31, which is fixedly mounted on the clamping part 30. The clamping parts 30 and 31 are preferably at the point of a wear-resistant material to which they weft weft threads 5.

Um die Klemmkraft in gewünschter Weise einzustellen und zu verändern, können selbstverständlich sehr verschiedene Einrichtungen vorgesehen werden. Beispielsweise sind elektromagnetische, hydraulische und mechanische Einrichtungen möglich. Mechanische Einrichtungen können beispielsweise einen Achsantrieb, ein Getriebe, Federn, Nocken und andere mechanische Bauteile enthalten. Bei einer Luftdüsenwebmaschine ist es von Vorteil, eine pneumatische Einrichtung zu verwenden, beispielsweise einen Druckluftzylinder 22, der die Klemmteile 30 und 31 aneinander andrücken kann. Der dargestellte Druckluftzylinder 22 ist einfach wirkend, d.h. er wird in einer Richtung (vorzugsweise der Klemmrichtung) über Druckluft betätigt und in der anderen Richtung mittels einer Rückstellfeder 34 zurückgestellt. Durch das entsprechende Einstellen und Ändern des Druckes der Druckluft kann die Klemmkraft, die mittels des Druckzylinders 22 zwischen den Klemmteilen 30 und 31 ausgeübt wird, eingestellt und verändert werden. Bei einer abgewandelten Ausführungsform wird ein doppelt wirkender Druckluftzylinder vorgesehen, d.h. ein Druckluftzylinder, der in beiden Richtung mittels Druckluft betätigt wird.To set and change the clamping force in the desired manner, of course, very different means can be provided. For example, electromagnetic, hydraulic and mechanical devices are possible. Mechanical devices may include, for example, a final drive, a transmission, springs, cams and other mechanical components. In an air jet loom, it is advantageous to use a pneumatic device, for example a pneumatic cylinder 22, which can press the clamping parts 30 and 31 against each other. The illustrated air cylinder 22 is single-acting, ie it is operated in one direction (preferably the clamping direction) via compressed air and returned in the other direction by means of a return spring 34. By appropriately adjusting and changing the pressure of the compressed air, the clamping force exerted by the pressure cylinder 22 between the clamp members 30 and 31 can be adjusted and changed. In a modified embodiment, a double-acting compressed air cylinder is provided, ie a compressed air cylinder which is actuated in both directions by means of compressed air.

Bei dem Ausführungsbeispiel wird eine Ventileinheit 23 eingesetzt, um den gewünschten Druck der Druckluft zu erhalten. Die Ventileinheit 23 besteht in dem dargestellten Ausführungsbeispiel aus einem elektrisch ansteuerbaren Druckregler 32 und einem elektrisch betätigbaren 3/2-Wegeventil 33. Mit dem Druckregler 32 kann der gewünschte Druck der Druckluft und damit die gewünschte Klemmkraft eingestellt werden. In einer ersten Position des 3/2-Wegeventils 33 gelangt die Druckluft zum Druckluftzylinder 22, so dass eine Klemmkraft auf die Klemmteile 30, 31 ausgeübt wird. In der anderen Position des 3/2-Wegeventils 33 gelangt keine Druckluft zu dem Druckluftzylinder 22, der über das 3/2-Wegeventil 33 entlüftet wird, so dass die Klemmteile 30, 31 von der Rückstellfeder 34 des Druckluftzylinders 22 auseinander bewegt werden, so dass keine Klemmkraft zwischen den Klemmteilen 30, 31 ausgeübt wird. Um die Bewegung des Klemmteils 30 zu beschränken, ist ein Anschlag 35 vorgesehen, der beispielsweise so eingestellt ist, dass das Klemmteil 30 sich nur soweit bewegen kann, dass zwischen den Klemmteilen 30, 31 ein Spalt von 0,5 mm besteht.In the embodiment, a valve unit 23 is used to obtain the desired pressure of the compressed air. The valve unit 23 consists in the illustrated embodiment of an electrically controllable pressure regulator 32 and an electrically operated 3/2-way valve 33. With the pressure regulator 32, the desired pressure of the compressed air and thus the desired clamping force can be adjusted. In a first position of the 3/2-way valve 33, the compressed air to the compressed air cylinder 22, so that a clamping force on the clamping parts 30, 31 is applied. In the other position of the 3/2-way valve 33 no compressed air reaches the compressed air cylinder 22, which is vented via the 3/2-way valve 33, so that the clamping members 30, 31 are moved apart from the return spring 34 of the air cylinder 22, so that no clamping force between the clamping parts 30, 31 is applied. In order to limit the movement of the clamping member 30, a stop 35 is provided, which is for example adjusted so that the clamping member 30 can only move so far that there is a gap of 0.5 mm between the clamping members 30, 31.

Bevorzugt ist der Druckregler 32 ein Proportionaldruckregler, der Druckluft mit einem Druck weiterleitet, die der an dem Druckregler 32 angelegten Größe der Spannung entspricht. Die Steuereinheit 21 gibt ein elektrisches Signal mit einer geeigneten Spannung an den Druckregler 32, um auf diese Weise den gewünschten Druck der Druckluft einzustellen und damit die gewünschte Klemmkraft oder den gewünschten Verlauf der Klemmkraft der Klemmvorrichtung 1 zwischen den Klemmteilen 30 und 31.Preferably, the pressure regulator 32 is a proportional pressure regulator that communicates compressed air at a pressure corresponding to the magnitude of the voltage applied to the pressure regulator 32. The control unit 21 outputs an electrical signal with a suitable voltage to the pressure regulator 32, in order to set in this way the desired pressure of the compressed air and thus the desired clamping force or the desired course of the clamping force of the clamping device 1 between the clamping parts 30 and 31.

Bei einer abgewandelten Ausführungsform sind dem Druckluftzylinder mehrere Druckregler 32 und 3/2-Wegeventile 33 zugeordnet, wobei die Druckregler jeweils auf einen definierten Druck der Druckluft eingestellt sind. Wenn der Druck der dem Druckluftzylinder 22 zugeführten Druckluft geändert werden soll, so wird jeweils ein betreffendes 3/2-Wegeventil 33 angesteuert, das mit einem auf den gewünschten Druck eingestellten Druckregler 32 verbunden ist.In a modified embodiment, the compressed air cylinder, a plurality of pressure regulator 32 and 3/2-way valves 33 associated with the pressure regulator are each set to a defined pressure of the compressed air. When the pressure of compressed air supplied to the compressed air cylinder 22 is to be changed, a respective 3/2-way valve 33, which is connected to a pressure regulator 32 set to the desired pressure, is driven in each case.

Bei einer abgewandelten Ausführungsform wird ein Druckluftsystem vorgesehen, das Druckluft mit einem gewünschten Druck erzeugt und das beispielsweise unter anderem Drosselventile enthält.In a modified embodiment, a compressed air system is provided which generates compressed air at a desired pressure and contains, for example, inter alia, throttle valves.

Bei dem Ausführungsbeispiel ist das bewegliche Klemmteil 30 mittels Schrauben 42 an einem Arm 43 befestigt, der mittels eines Gelenkes 36 an einer Halterung 37 gehalten ist, die an der Webmaschine befestigt ist. Das bewegliche Klemmteil 30 kann somit um das Gelenk 36, dessen Achse quer zu dem Druckzylinder 22 verläuft, schwenken. Der Druckzylinder 22 greift an dem Arm 43 an einer Stelle an, die zwischen dem Drehgelenk 36 und der Stelle des Klemmteils 30 liegt, die einen Schussfaden klemmt. An der Halterung 37 ist zusätzlich die Schussschere 4 befestigt. Die Schussschere 4 weist ein fest montiertes Scherblatt 38 und ein beweglich montiertes Scherblatt 39 auf. Das beweglich montierte Scherblatt 39 ist auf einer Antriebswelle 40 eines Antriebsmotors 41 angeordnet. Das fest montierte Klemmteil 31 ist mittels Schrauben 44 an und neben dem fest montierten Scherblatt 38 angebracht. Bei der dargestellten Ausführungsform liegen die Oberkante des Klemmteils 31 und die Oberkante des Scherblattes 38 im wesentlichen in einer Ebene. Die Antriebswelle 40 verläuft parallel zur Schussrichtung und zu der Achse des Gelenks 36.In the embodiment, the movable clamping member 30 is fixed by means of screws 42 to an arm 43 which is held by means of a hinge 36 to a holder 37 which is fixed to the loom. The movable clamping member 30 can thus pivot about the hinge 36 whose axis is transverse to the impression cylinder 22. The impression cylinder 22 engages the arm 43 at a location intermediate between the pivot 36 and the location of the clamp member 30 which clamps a weft. On the holder 37, the weft cutter 4 is additionally attached. The shot shear 4 has a fixed shear blade 38 and a movably mounted shear blade 39. The movably mounted shear blade 39 is arranged on a drive shaft 40 of a drive motor 41. The permanently mounted clamping part 31 is by means of screws 44 at and mounted adjacent to the fixed shear blade 38. In the illustrated embodiment, the upper edge of the clamping member 31 and the upper edge of the shear blade 38 are substantially in one plane. The drive shaft 40 extends parallel to the weft direction and to the axis of the joint 36.

Die Klemmvorrichtung 2 ist bevorzugt in gleicher Weise ausgeführt und gestaltet wie die Klemmvorrichtung 1. Die Abfallschere 7 ist ebenfalls in gleicher Weise wie die Schussschere 4 ausgeführt und zusammen mit entsprechenden Klemmteilen 30, 31 und einem entsprechenden Druckluftzylinder 22 an einer entsprechenden Halterung 37 angebracht.The clamping device 2 is preferably carried out in the same way and designed as the clamping device 1. The waste scissors 7 is also performed in the same manner as the shot shear 4 and attached together with corresponding clamping members 30, 31 and a corresponding air cylinder 22 to a corresponding holder 37.

Wie beispielsweise in Fig. 3 dargestellt ist, enthält die Webmaschine einen Kantenapparat 11, der neben der Kante 10 des Gewebes zwischen der Klemmvorrichtung 1 und dem Gewebe 3 angeordnet ist. Der Kantenapparat 11 besitzt eine in einer Halterung untergebrachte Blasvorrichtung 27, um das Ende 9 eines eingetragenen Schussfadens 5 in ein nachfolgend gebildetes Webfach einzulegen. Die Blasvorrichtung 27 besitzt eine Düse 28, die im Bereich einer Nut des Halters angeordnet ist, die zum Führen eines Schussfadens dient. Ferner besitzt sie wenigstens eine Blasdüse 29 an der Seite des Halters. Die Blasvorrichtung 27 ist über eine Ventileinheit 25 mit einer Druckluftquelle verbunden, beispielsweise der Druckluftquelle 24 der Fig. 2. Die Blasvorrichtung 27 ist in der Nähe der Anschlaglinie 15 angeordnet. Die Ventileinheit 25 wird in geeigneten Zeitabständen von einer Steuereinheit angesteuert, beispielsweise der Steuereinheit 21, um ein Ende 9 eines Schussfadens 5 in ein nach dem Eintragen dieses Schussfadens 5 nachfolgend gebildetes Webfach einzublasen. Die Blasvorrichtung 27 und die Ventileinheit 25, die Bestandteil des Kantenapparates 11 sind, können beispielsweise in gleicher Weise ausgeführt sein, wie das in der Patentanmeldung WO 01/86047 beschrieben ist. Der auf der gegenüber liegenden Seite des Gewebes 3 angeordnete Kantenapparat 14 (Fig. 1) ist beispielsweise gleich ausgebildet wie der Kantenapparat 11.Such as in Fig. 3 is shown, the weaving machine includes an edge apparatus 11 which is disposed adjacent to the edge 10 of the fabric between the clamping device 1 and the fabric 3. The edge apparatus 11 has a blowing device 27 accommodated in a holder for inserting the end 9 of a registered weft thread 5 into a subsequently formed shed. The blowing device 27 has a nozzle 28, which is arranged in the region of a groove of the holder, which serves to guide a weft thread. Further, it has at least one blowing nozzle 29 on the side of the holder. The blowing device 27 is connected via a valve unit 25 with a compressed air source, for example, the compressed air source 24 of Fig. 2 , The blowing device 27 is arranged in the vicinity of the stop line 15. The valve unit 25 is actuated at suitable time intervals by a control unit, for example the control unit 21, in order to blow one end 9 of a weft thread 5 into a shed subsequently formed after the insertion of this weft thread 5. The blowing device 27 and the valve unit 25, which are part of the edge apparatus 11, for example, can be carried out in the same manner as that in the patent application WO 01/86047 is described. The arranged on the opposite side of the fabric 3 edge apparatus 14 ( Fig. 1 ) is, for example, the same design as the edge apparatus 11.

Gemäß Fig. 3 bis 5 arbeiten die Vorrichtungen wie folgt. Nach dem Eintragen des Schussfadens 5 wird dieser von dem Webblatt 17 in Richtung der Kettfäden 16 verschoben. Das Ende 9 des Schussfadens 5 gelangt auf diese Weise zwischen die Klemmteile 30, 31 der Klemmvorrichtung 1. Mit diesem Verschieben (Anschlagen) wird das Ende 9 des Schussfadens 5 auch in den Kantenapparat 11 eingeführt. Anschließend wird der Schussfaden 5 mittels der Schussschere 4 vom Fadenvorrat 6 abgeschnitten (Fig. 3). Das Ende 9 des Schussfadens 5 befindet sich nach dem Abschneiden weiterhin in der Klemmvorrichtung 1, während sich das Webblatt 17 und die Hauptdüse 18 mit der Weblade wieder von der Anschlaglinie 15 hinweg bewegen. Nach dem Abschneiden wird die Klemmkraft der Klemmvorrichtung 1 reduziert oder aufgehoben, wonach die Blasvorrichtung 27 des Kantenapparates 11 das Ende 9 in ein nachfolgendes Webfach einbläst (Fig. 4). In dieses Webfach wird der nachfolgende Schussfaden 5 eingetragen (Fig. 4). Der nachfolgende Schussfaden 5 wird dann zusammen mit dem eingeblasenen Ende 9 des vorher eingetragenen Schussfadens 5 von dem Webblatt 17 mitgenommen und angeschlagen (Fig. 5). Auf diese Weise entsteht ein Gewebe 3 mit einer eingelegten Kante 26. In entsprechender Weise, wie das anhand Fig. 3 bis 5 dargestellt und erläutert worden ist, wird das Ende 12 des Schussfadens mittels der Klemmvorrichtung 2 geklemmt, mittels der Abfallschere 7 abgeschnitten und mittels des Kantenapparates 14 in das nachfolgende Webfach eingelegt.According to Fig. 3 to 5 the devices work as follows. After the insertion of the weft thread 5, it is displaced by the reed 17 in the direction of the warp threads 16. The end 9 of the weft thread 5 passes in this way between the clamping parts 30, 31 of the clamping device 1. With this displacement (striking), the end 9 of the weft thread 5 is also introduced into the edge apparatus 11. Subsequently, the weft thread 5 is cut off from the thread supply 6 by means of the weft cutter 4 ( Fig. 3 ). The end 9 of the weft thread 5 is still in the clamping device 1 after cutting, while the reed 17 and the main nozzle 18 with the sley again move from the stop line 15 away. After cutting, the clamping force of the clamping device 1 is reduced or canceled, after which the blowing device 27 of the edge apparatus 11, the end 9 in a subsequent shed blows ( Fig. 4 ). In this shed, the following weft thread 5 is entered ( Fig. 4 ). The following weft thread 5 is then taken along with the injected end 9 of the previously inserted weft thread 5 of the reed 17 and struck ( Fig. 5 ). In this way, creates a fabric 3 with an inserted edge 26. In a similar manner, as the basis Fig. 3 to 5 has been illustrated and explained, the end 12 of the weft thread is clamped by means of the clamping device 2, cut off by means of the garbage shears 7 and inserted by means of the edge apparatus 14 in the subsequent shed.

Erfindungsgemäß wird die Klemmkraft der Klemmvorrichtung 1 und /oder der Klemmvorrichtung 2 gemäß einem Kriterium, insbesondere einem Muster des Gewebes 3, verändert, das in Abhängigkeit vom herzustellenden Gewebe 3 festgelegt wird. Die Klemmkraft der Klemmvorrichtung 1 und / oder 2 kann gemäß einem Webmuster gesteuert werden, das von dem Muster des herzustellenden Gewebes 3 abhängig ist. Bei einem Ausführungsbeispiel wird das Webmuster abhängig von der Winkelposition der Hauptantriebswelle der Webmaschine bestimmt und zwar über mehrere Schusszyklen hinweg. Die Abhängigkeit wird von einem Schussmuster, von einem Bindungsmuster oder einem anderen Muster festgelegt, das Teil des Webmusters ist. Nachfolgend werden einige Möglichkeiten erläutert, bei welchen die Klemmkraft während des Webens gemäß einem Muster verändert wird.According to the invention, the clamping force of the clamping device 1 and / or the clamping device 2 is changed according to a criterion, in particular a pattern of the fabric 3, which is determined as a function of the fabric 3 to be produced. The clamping force of the clamping device 1 and / or 2 can be controlled according to a weave pattern that depends on the pattern of the fabric 3 to be produced. In one embodiment, the weave pattern is determined depending on the angular position of the main drive shaft of the loom and though over several firing cycles away. The dependency is determined by a weft pattern, a weave pattern, or another pattern that is part of the weave pattern. Here are some ways in which the clamping force is changed during weaving according to a pattern.

Die Erfindung ist besonders für einen Einsatz beim Weben von Frottiergeweben geeignet, bei welchem Enden 9 und 12 der Schussfäden 5 in das Gewebe eingelegt werden. Bei derartigen Geweben wird üblicherweise das Ende 9 und / oder 12 einer Gruppe von Schussfäden, die nacheinander eingetragen und angeschlagen wurden, zusammen in ein nachfolgendes Webfach eingelegt.The invention is particularly suitable for use in weaving terry fabrics, in which ends 9 and 12 of the weft threads 5 are inserted into the fabric. In such fabrics is usually the end 9 and / or 12 of a group of weft threads, which were sequentially registered and struck, inserted together in a subsequent shed.

Wie das in Fig. 6 dargestellt ist, werden die Schussfäden 5 einer Gruppe, beispielsweise zwei Schussfäden, nacheinander eingetragen und jeweils an einer Position 19 angeschlagen, die in einem deutlichen Abstand von der Anschlaglinie 15 liegt und die beispielsweise als Voranschlagposition 19 bezeichnet wird. Die Klemmvorrichtung 1 und die nicht dargestellte Klemmvorrichtung 2 sind derart angeordnet, dass sie die Enden 9 und 12 der Schussfäden 5 schon klemmen können, wenn sich die Schussfäden 5 in der Voranschlagposition 19 befinden, d.h. in einer Position in Abstand von der Anschlaglinie 15. Wenn mit einem Voranschlag gewoben wird, müssen die Klemmvorrichtungen 1 und 2 einen Schussfaden 5 klemmen können, wenn dieser sich in einer Position vor der Anschlaglinie 15 befindet und nicht immer mit Vollanschlag gewoben wird. Wie in Fig. 7 dargestellt ist, wird dann der letzte Schussfaden einer Gruppe eingebracht, beispielsweise dritter Schussfaden 5. Die Enden der Schussfäden dieser Gruppe, bei dem Ausführungsbeispiel von drei Schussfäden, werden dann zusammen mit dem zuletzt eingetragenen Schussfaden an der Anschlaglinie 15 angeschlagen, d.h. es wird ein Vollanschlag ausgeführt. Bei einem derartigen Frottiergewebe werden anschließend die Enden 9 und 12 der Gruppe von Schussfäden gleichzeitig in ein nachfolgenden Webfach eingelegt, wie das in Fig. 8 dargestellt ist, d.h. in ein Webfach, das nach dem Vollanschlag gebildet wird. Damit die Enden 9 und 12 der Gruppe von Schussfäden gemeinsam mit Hilfe eines Kantenapparates 11 oder 14 eingelegt werden können, müssen die Enden 9 oder 12 vor dem Einlegen genau zu dem Kantenapparat 11 oder 14 positioniert sein. Dabei ist es vorteilhaft, wenn die Klemmkraft der Klemmvorrichtungen 1 oder 2 nach einem vorgegebenen Muster verändert wird, da die Enden 9 oder 12 nach jedem Schusseintrag abgeschnitten werden und die Enden 9 oder 12 nach dem Abschneiden in der gewünschten Position mit einer gewünschten Klemmkraft von der Klemmvorrichtung 1 oder 2 gehalten werden sollen.Like that in Fig. 6 is shown, the weft threads 5 of a group, for example, two weft threads, entered one after the other and struck in each case at a position 19 which is at a significant distance from the stop line 15 and which is for example referred to as Voranschlagposition 19. The clamping device 1 and the clamping device 2, not shown, are arranged so that they can clamp the ends 9 and 12 of the weft threads 5 already when the weft threads 5 are in the Voranschlagposition 19, ie. In a position at a distance from the stop line 15. If is woven with an estimate, the clamping devices 1 and 2 must be able to clamp a weft thread 5, if this is in a position before the stop line 15 and is not always woven with full stop. As in Fig. 7 The ends of the weft threads of this group, in the embodiment of three weft threads, are then struck together with the last inserted weft thread on the stop line 15, ie it is a full stop executed. In such a terry fabric then the ends 9 and 12 of the group of weft yarns are simultaneously inserted into a subsequent shed, as in Fig. 8 shown is, ie in a shed, which is formed after the full stop. In order for the ends 9 and 12 of the group of weft yarns to be inserted together by means of an edge apparatus 11 or 14, the ends 9 or 12 must be accurately positioned to the edge apparatus 11 or 14 prior to loading. It is advantageous if the clamping force of the clamping devices 1 or 2 is changed according to a predetermined pattern, since the ends 9 or 12 are cut off after each weft insertion and the ends 9 or 12 after cutting in the desired position with a desired clamping force of the Clamping device 1 or 2 to be kept.

Die Enden 9 und 12 der Schussfäden 5, die bis zum Voranschlag angeschlagen werden, werden mit einer relativ hohen Klemmkraft in den Klemmvorrichtungen 1 und 2 geklemmt, um sie sicher zu halten. Bei einem anschließenden Vollanschlag wird die Klemmkraft der Klemmvorrichtungen 1 und 2 verringert, damit die Enden 9 und 12 der zuvor eingetragenen Schussfäden zusammen mit den Enden 9 und 12 des zuletzt eingetragenen Schussfadens, der mit dem Vollanschlag angeschlagen wird, zwischen den Klemmteilen 30, 31 der Klemmvorrichtungen 1 und 2 gleiten können. Falls die Klemmkraft bei dem Vollanschlag zu groß gehalten wäre, so besteht das Risiko, dass die schon geklemmten Enden 9 und 12 bei dem anschließenden Vollanschlag beschädigt werden, da die Enden 9 und 12 durch die Klemmvorrichtungen 1 und 2 hindurch gezogen werden. Da die Klemmkraft der Klemmvorrichtung 1 und 2 gemäß einem Muster gesteuert wird, bei welchem beim Voranschlag die Klemmkraft relativ groß und beim Vollanschlag die Klemmkraft relativ gering ist, ergibt sich der Vorteil, dass die Enden der Schussfäden nach jedem Voranschlag in ausreichender Weise gehalten sind, jedoch bei dem anschließenden Vollanschlag nicht beschädigt werden. Dabei wird die Klemmkraft beispielsweise nach dem Schussmuster und im Einzelnen nach dem Polbildungsmuster - auch Frottiermuster genannt - des herzustellenden Gewebes gesteuert.The ends 9 and 12 of the weft yarns 5, which are struck to the preliminary stop, are clamped with a relatively high clamping force in the clamping devices 1 and 2 in order to keep them safe. In a subsequent full stop, the clamping force of the clamping devices 1 and 2 is reduced so that the ends 9 and 12 of the previously registered weft threads together with the ends 9 and 12 of the last weft inserted, which is struck with the full stop, between the clamping parts 30, 31 of Clamping devices 1 and 2 can slide. If the clamping force would be kept too high at the full stop, there is a risk that the already clamped ends 9 and 12 are damaged in the subsequent full stop, since the ends 9 and 12 are pulled through the clamping devices 1 and 2. Since the clamping force of the clamping device 1 and 2 is controlled according to a pattern in which the clamping force is relatively large at the preliminary stop and the clamping force is relatively low at full stop, there is the advantage that the ends of the weft threads are held sufficiently after each estimate, but will not be damaged in the subsequent full stop. The clamping force is controlled, for example, according to the weft pattern and in detail according to the Polbildungsmuster - also known as terry - - the fabric to be produced.

In dem vorstehend genannten Beispiel ist ein Polbildungsmuster mit drei Schussfäden erwähnt. Selbstverständlich kann auch ein Polbildungsmuster mit einer anderen Anzahl an Schussfäden gewählt werden, beispielsweise ein Polbildungsmuster, bei dem drei aufeinanderfolgende Schussfäden bis zu einem Voranschlag angeschlagen werden, auf die dann ein Schussfaden mit einem Vollanschlag folgt. In diesem Fall wird die Klemmkraft bei dem drei ersten Schusseinträgen groß und bei den folgenden Schusseintrag gering eingestellt. Selbstverständlich sind auch Kombinationen unterschiedlicher Polbildungsmuster möglich.In the above example, a three-weft poling pattern is mentioned. Of course, a Polbildungsmuster with a different number of wefts can be selected, for example, a Polbildungsmuster in which three consecutive weft threads are struck up to an estimate, then followed by a weft with a full stop. In this case, the clamping force in the first three weft entries becomes large and low in the following weft insertion. Of course, combinations of different Polbildungsmuster are possible.

Es ist bekannt, dass beim Weben von Frottierstoffen über eine bestimmte Strecke, d.h. während einer Anzahl von Schusseinträgen, immer mit Vollanschlag gewoben wird, so dass eine Strecke mit Flachgewebe entsteht. Dabei wird mit einer Frottierwebmaschine ein Stück normales Gewebe gewoben, was auch Bordürenweben genannt wird. Bei diesem Webvorgang wird die Klemmkraft der Klemmvorrichtung 1 und / oder 2 im Vergleich zur Klemmkraft, die beim Weben bis zum Voranschlag verwendet wird, verringert. Dadurch können die Enden 9 und oder 12 der Schussfäden beim Bordürenweben einfach durch die Klemmvorrichtungen 1 und 2 gezogen werden, wodurch diese Enden 9 und / oder 12 nicht beschädigt werden und eine saubere Kante des Gewebes 3 entsteht. Beim Bordürenweben können die Enden 9 und / oder 12 jedes Schussfadens 5 mittels der Kantenapparate 11 oder 14 jeweils einzeln in ein nachfolgendes Webfach eingelegt werden. Bei einer abgewandelten Ausführungsform wird vorgesehen, dass bei dem Bordürenweben die Klemmvorrichtungen 1 und / oder 2 geöffnet bleiben, d.h. so angesteuert werden, dass sie keine Klemmkraft auf die Enden 9 und / oder 12 der Schussfäden ausüben.It is known that when weaving terry fabrics over a certain distance, i. during a number of weft insertion, always with full stop is woven, so that a stretch arises with flat fabric. In this case, a piece of normal tissue is woven with a terry loom, which is also called burr weaving. In this weaving operation, the clamping force of the clamping device 1 and / or 2 is reduced as compared with the clamping force used in weaving up to the preliminary stop. Thus, the ends 9 and or 12 of the weft yarns in Bordürenweben can be easily pulled through the clamping devices 1 and 2, whereby these ends 9 and / or 12 are not damaged and a clean edge of the fabric 3 is formed. When Bordürenweb the ends 9 and / or 12 of each weft thread 5 can be inserted by means of the edge apparatuses 11 or 14 individually in a subsequent shed. In a modified embodiment, it is provided that in the case of burr weaving the clamping devices 1 and / or 2 remain open, i. be driven so that they exert no clamping force on the ends 9 and / or 12 of the weft threads.

Bei einer Ausführungsform wird das Muster des herzustellenden Gewebes von der Steuereinheit 21 der Webmaschine in Abhängigkeit von der Winkelposition der Hauptantriebswelle der Webmaschine bestimmt. Bei bestimmten Geweben kann es wünschenswert sein, die Enden 9 und 12 der Schussfäden mit sehr großer Klemmkraft geklemmt zu halten. Das bietet den Vorteil, dass die auf diese Weise geklemmten Schussfäden nach dem Abschneiden nicht zurückspringen und nicht zu einem Zusammenziehen des Gewebes führen. Wenn die Schussfäden sehr gut festsgehalten werden, so können die Kettfäden am Warenrand gut um den eingetragenen Schussfaden herumgelegt werden, so dass sie einen guten Warenrand bilden. Um das Einführen der Enden 9 und 12 der Schussfäden 5 in die Klemmvorrichtungen 1 und / oder 2 zu erleichtern, wird die Klemmkraft der Klemmvorrichtungen 1 und / oder 2 zunächst relativ gering eingestellt. Nach dem Einführen wird dann die Klemmkraft wieder erhöht. Erfindungsgemäß wird die Klemmkraft dabei nach dem Schusszyklus und insbesondere entsprechend der Winkelposition der Hauptantriebswelle oder nach einem zeitlichen Verlauf, der sich auf die Winkelposition der Hauptantriebswelle der Webmaschine bezieht, so verändert, dass die Klemmkraft beim Einführen der Enden 9 und / oder 12 der Schussfäden 5 in die Klemmvorrichtung 1 und / oder 2 relativ gering ist oder gar keine Kraft aufgebracht wird und dass die Klemmkraft wenigstens während oder nach dem Abschneiden der Schussfäden 5 relativ groß ist. Falls diese Enden 9 und / oder 12 der Schussfäden anschließend in die Gewebekante eingelegt werden sollen, kann es von Vorteil sein, die Klemmkraft der Klemmvorrichtungen 1 und / oder 2 kurz vor dem Einlegen der Enden 9 und / oder 12 in ein nachfolgendes Webfach etwas zu verringern, damit diese Enden 9 und / oder 12 problemlos aus den Klemmvorrichtungen 1 und / oder 2 gezogen werden können, bevor sie von der Blasvorrichtung 27 in ein nachfolgend gebildetes Webfach eingelegt werden. Die Klemmkraft wird im Wesentlichen abhängig von der Winkelposition der Hauptantriebswelle der Webmaschine verändert.In one embodiment, the pattern of the fabric to be produced is determined by the control unit 21 of the weaving machine as a function of the angular position of the main drive shaft of the loom. For certain fabrics, it may be desirable to have the ends 9 and 12 to keep the weft threads clamped with a very large clamping force. This offers the advantage that the weft threads clamped in this way do not spring back after cutting off and do not lead to a contraction of the fabric. If the weft threads are held very well, so the warp threads can be placed well around the weft thread at the edge of the goods so that they form a good edge of the goods. In order to facilitate the insertion of the ends 9 and 12 of the weft threads 5 in the clamping devices 1 and / or 2, the clamping force of the clamping devices 1 and / or 2 is initially set relatively low. After insertion, the clamping force is then increased again. According to the invention, the clamping force is changed after the firing cycle and in particular according to the angular position of the main drive shaft or after a time course, which relates to the angular position of the main drive shaft of the loom, that the clamping force during insertion of the ends 9 and / or 12 of the weft threads. 5 in the clamping device 1 and / or 2 is relatively low or no force is applied and that the clamping force, at least during or after the cutting of the weft threads 5 is relatively large. If these ends 9 and / or 12 of the weft threads are to be subsequently inserted into the fabric edge, it may be advantageous to slightly increase the clamping force of the clamping devices 1 and / or 2 shortly before inserting the ends 9 and / or 12 into a subsequent shed reduce, so that these ends 9 and / or 12 can be easily pulled out of the clamping devices 1 and / or 2 before they are inserted by the blowing device 27 in a subsequently formed shed. The clamping force is changed substantially depending on the angular position of the main drive shaft of the loom.

Bei einer anderen Ausführungsform wird die Klemmkraft der Klemmvorrichtung 1 und / oder 2 auch in Abhängigkeit vom eingebrachten Schussfaden 5 und insbesondere von der Art des einzubringenden Schussfadens verändert. Beispielsweise wird für einen dünnen Schussfaden eine größere Klemmkraft gewählt, als für einen dickeren Schussfaden. Wenn die gleichen Klemmkräfte für dicke und dünne Schussfäden erhalten werden sollen, so wird normalerweise der Abstand der Klemmteile für dickere Schussfäden einen größeren Wert erhalten als für dünnere Schussfäden. Die Einstellung erfolgt entsprechend dem Schussmuster. Bei einer anderen Ausführungsform wird die Klemmkraft entsprechend dem Bindungsmuster eingestellt und / oder geändert. Wenn die Bindung mit gleich vielen Kettfäden an der Oberseite und an der Unterseite gebildet wird, so wird die Klemmkraft beispielsweise auf relativ geringe Werte eingestellt. Wenn dagegen ein beträchtlicher Unterschied zwischen der Anzahl der Kettfäden der Oberseite und der Unterseite besteht, wird die Klemmkraft relativ groß gewählt und eingestellt.In another embodiment, the clamping force of the clamping device 1 and / or 2 is also changed depending on the inserted weft thread 5 and in particular on the type of weft thread to be introduced. For example, for a thin weft chosen a larger clamping force, as for a thicker weft. If the same clamping forces are to be obtained for thick and thin weft threads, the spacing of the clamping parts for thicker weft threads will normally be greater than for thinner weft threads. The adjustment is made according to the pattern. In another embodiment, the clamping force is adjusted and / or changed according to the weave pattern. If the binding is formed with the same number of warp threads at the top and at the bottom, the clamping force is set to relatively low values, for example. In contrast, if there is a considerable difference between the number of warp threads of the top and bottom, the clamping force is chosen and set relatively large.

Selbstverständlich kann die Klemmkraft außer in Abhängigkeit vom Schussmuster, von der Winkelposition der Hauptantriebswelle, vom Frottiermuster, vom Bordürenweben, von anderen Parametern des herzustellenden Gewebes und von Kombinationen der oben genannten Parameter des herzustellenden Gewebes verändert werden, beispielsweise in Abhängigkeit von der Kettspannung, der Schussspannung, der Polhöhe der Schlingen des Frottiergewebes, der Winkelposition der Hauptantriebswelle, einem zeitlichen Verlauf, oder abhängig von Ergebnissen von Messungen, die während des Webens vorgenommen werden.Of course, the clamping force can be changed except in dependence on the weft pattern, the angular position of the main drive shaft, the terry, the Bordürenweb, other parameters of the fabric to be produced and combinations of the above parameters of the fabric to be produced, for example, depending on the warp tension, the weft tension , the pole height of the loops of the terry tissue, the angular position of the main drive shaft, a time course, or depending on results of measurements made during weaving.

Wenn ein bestimmtes Gewebe gewebt werden soll, wird der gewünschte Verlauf der Klemmkraft in Abhängigkeit von der Winkelposition der Hauptantriebswelle der Webmaschine vorgegeben und entsprechend der Winkelposition jeweils eingestellt. Wenn zum Beispiel ein Frottiergewebe gewebt werden soll, das zwanzig Reihen mit drei innerhalb einer Schlinge liegenden Schussfäden aufweist, zehn Reichen mit vier innerhalb einer Schlinge liegenden Schussfäden, zwanzig Reihen mit drei innerhalb einer Schlinge liegenden Schussfäden und einer Bordüre aus flachem Gewebe mit zehn Schussfäden, besteht das Webmuster aus 170 Schusseinträgen. Für jeden Schusseintrag wird ein Verlauf der Klemmkraft in Verbindung mit der Winkelposition der Hauptantriebswelle bestimmt und abgespeichert. Für jeden einzelnen Schusseintrag bei der Herstellung des Gewebes wird dann die Klemmkraft entsprechend der zugehörigen Winkelposition der Hauptwelle der Webmaschine eingestellt. Diese Maßnahme wird als Webmuster des herzustellenden Gewebes bezeichnet.If a certain tissue is to be woven, the desired course of the clamping force is determined depending on the angular position of the main drive shaft of the loom and adjusted according to the angular position respectively. For example, when it is desired to weave a terry fabric having twenty rows of three wefts within a loop, ten tiers of four wefts within a loop, twenty rows of three wefts within a loop, and a flat weft of ten wefts, exists the weave pattern from 170 weft entries. For each weft insertion a course of the clamping force in conjunction with the angular position of the main drive shaft is determined and stored. For each individual weft insertion in the production of the fabric clamping force is then adjusted according to the associated angular position of the main shaft of the loom. This measure is referred to as weaving pattern of the fabric to be produced.

Bei dem Weben eines Frottiergewebes und insbesondere beim Weben eines Frottiergewebes mit eingelegten Enden der Schussfäden kann es vorteilhaft sein, eine Vorrichtung entsprechend Fig. 9 und 10 zu verwenden. Die Klemmvorrichtung 1 ist an einer derartigen Stelle montiert, dass sie mit einem Ende 9 eines teilweise angeschlagenen Schussfadens 5 zusammenwirkt, d.h. mit einem Schussfaden 5, der bis zur Voranschlagposition 19 angeschlagen wird. Die Klemmvorrichtung 1 ist weiter so angeordnet, dass sie nicht auf einen vollständig angeschlagenen Schussfaden einwirkt, d.h. auf einen Schussfaden, der an die Anschlaglinie 15 angeschlagen worden ist. Die Klemmteile 30 und 31 der Klemmvorrichtung 1 sind so angeordnet und gestaltet, dass sie in dem Bereich vor der Anschlaglinie 15 nicht zusammenwirken, d.h. keine Klemmwirkung ausführen. Hierzu ist die Klemmvorrichtung 1 mit einer Aussparung 45 im Bereich der Klemmteile 30 und 31 versehen. Diese Ausführungsform ermöglicht es beispielsweise (Fig. 9) zwei Enden 9 eines Schussfadens 5, die bis zu dem Voranschlag 19 angeschlagen wurden, zu klemmen. Diese beiden Enden 9 werden dann bei einem Vollanschlag für den dritten, nachfolgend eingebrachten Schussfaden mittels des Webblattes 17 bis zu dem Bereich der Aussparung 45 mitgenommen, wie dies in Fig. 10 gezeigt ist.In the weaving of a terry cloth and in particular in the weaving of a terry cloth with inserted ends of the weft threads, it may be advantageous to a device accordingly FIGS. 9 and 10 to use. The clamping device 1 is mounted in such a position that it cooperates with one end 9 of a partially damaged weft thread 5, ie with a weft thread 5, which is struck up to the Voranschlagposition 19. The clamping device 1 is further arranged so that it does not act on a completely damaged weft yarn, ie on a weft which has been struck against the stop line 15. The clamping parts 30 and 31 of the clamping device 1 are arranged and designed so that they do not cooperate in the area in front of the stop line 15, ie perform no clamping action. For this purpose, the clamping device 1 is provided with a recess 45 in the region of the clamping parts 30 and 31. This embodiment allows, for example, Fig. 9 ) to clamp two ends 9 of a weft thread 5 which have been struck up to the preliminary stop 19. These two ends 9 are then taken at a full stop for the third, subsequently introduced weft thread by means of the reed 17 to the region of the recess 45, as shown in Fig. 10 is shown.

Bei einem Vollanschlag wird beispielsweise die Klemmkraft zwischen den Klemmteilen 30, 31 verringert, gegenüber der Klemmkraft beim Voranschlag 19. Die drei Enden 9 der Schussfäden 5 werden bei dem Vollanschlag des zuletzt eingetragenen Schussfadens mitgenommen und gelangen in den Bereich der Aussparung 45. Sie sind dann nicht mehr geklemmt und können dann gemeinsam mit Hilfe eines Kantenapparates 11 in ein nachfolgendes Webfach eingelegt werden. Da die Enden 9 der Schussfäden 5 ohnehin nicht mehr geklemmt sind, ist es nicht erforderlich die Klemmkraft der Klemmvorrichtung 1 bei dem mittels des Kantenapparates ausgeführten Einlegevorgang zu verringern. Eine Aussparung 45 entsprechend Fig. 9 und 10 kann selbstverständlich auch bei einer Klemmvorrichtung 2 angewandt werden.In the case of a full stop, for example, the clamping force between the clamping parts 30, 31 is reduced, compared to the clamping force in the preliminary stop 19. The three ends 9 of the weft threads 5 are taken along with the full stop of the last weft thread entered and reach into the region of the recess 45. They are then no longer clamped and can then be inserted together with the aid of an edge apparatus 11 in a subsequent shed. Since the ends 9 of the weft threads 5 are no longer clamped anyway, it is not necessary to reduce the clamping force of the clamping device 1 in the running by means of the edge apparatus insertion operation. A recess 45 accordingly FIGS. 9 and 10 can of course also be applied to a clamping device 2.

Falls keine Kantenapparate 11 und / oder 14 vorhanden sind, können die Klemmvorrichtungen 1 und 2 und die zugehörige Schussschere 4 und die Abfallschere 7 näher an dem Gewebe 3 angeordnet werden.If no edge apparatus 11 and / or 14 are present, the clamping devices 1 and 2 and the associated shot shear 4 and the litter shears 7 can be arranged closer to the fabric 3.

Die Parameter eines herzustellenden Gewebes können noch auf andere Art und Weise bestimmt werden. Sie müssen nicht notwendigerweise anhand des vorstehend beschriebenen Webmusters bestimmt werden. Das Webmuster kann darüber hinaus noch weitere Parameter umfassen. In den meisten Fällen wird das Webmuster in Abhängigkeit von den einzutragenden Schussfäden bestimmt. Jedoch kann das Webmuster auch in Abhängigkeit von aufeinander folgenden Positionen der Kettfäden oder in einer anderen bekannten Art und Weise bestimmt werden.The parameters of a tissue to be produced can still be determined in other ways. They do not necessarily have to be determined from the weave pattern described above. The weave pattern may also include other parameters. In most cases, the weave pattern is determined depending on the weft threads to be entered. However, the weave pattern may also be determined depending on successive positions of the warp threads or in some other known manner.

Die Veränderung der Klemmkraft ist üblicherweise mit einer tatsächlichen Relativbewegung der Klemmteile 30 und 31 zueinander verbunden. Falls jedoch beispielsweise ein im Wesentlichen unnachgiebiger Schussfaden zwischen den Klemmteilen 30 und 31 geklemmt wird, so wird eine Veränderung der Klemmkraft nicht notwendigerweise zu einer Relativbewegung der Klemmteile 30, 31 zu einander führen. Eine Relativbewegung zwischen den Klemmteilen 30 und 31 der Klemmvorrichtung 1 oder 2 beim Verändern der Klemmkraft wird jedoch dann erfolgen, wenn ein elastischer Schussfaden geklemmt wird.The change in the clamping force is usually connected to an actual relative movement of the clamping parts 30 and 31 to each other. However, if, for example, a substantially unyielding weft thread is clamped between the clamping parts 30 and 31, a change in the clamping force will not necessarily lead to a relative movement of the clamping parts 30, 31 to each other. A relative movement between the clamping parts 30 and 31 of the clamping device 1 or 2 when changing the clamping force will, however, take place when an elastic weft thread is clamped.

Das Einlegen der Enden 9 und / oder 12 der Schussfäden 5 in ein nachfolgendes Webfach kann selbstverständlich nicht nur mit pneumatischen Kantenapparaten durchgeführt werden, sondern mit anderen mechanischen Kantenapparaten, wie sie beispielsweise aus der EP 322014 A bekannt sind.The insertion of the ends 9 and / or 12 of the weft threads 5 in a subsequent shed can of course be carried out not only with pneumatic edge apparatus, but with other mechanical edge apparatus, as for example from the EP 322014 A are known.

Die Erfindung ist auch nicht auf eine Anwendung von Luftdüsenwebmaschinen beschränkt. Sie kann vielmehr bei jeder Art von Webmaschinen eingesetzt werden, beispielsweise bei Greiferwebmaschinen, Greiferschützenwebmaschinen, Wasserstrahlwebmaschinen, Projektilwebmaschinen, mehrphasigen Webmaschinen und Webrotoren und anderen Webmaschinentypen.The invention is not limited to an application of air jet looms. Rather, it can be used in any type of loom, for example rapier looms, rapier looms, water jet looms, projectile looms, multiphase looms and weaving rotors, and other types of weaving machines.

Die erfindungsgemäße Vorrichtung, die erfindungsgemäße Webmaschine und das erfindungsgemäße Verfahren sind nicht auf die nur als Beispiel beschriebenen Ausführungsformen beschränkt.The device according to the invention, the weaving machine according to the invention and the method according to the invention are not limited to the embodiments described by way of example only.

Claims (18)

  1. Method for clamping the ends (9, 12) of inserted weft threads (5) into a shed in a weaving machine, that comprises at least one clamping device (1, 2) for weft threads (5) which can be actuated during a weaving procedure, wherein the ends (9, 12) are held clamped by means of the clamping device (1, 2) and the clamping device (1, 2) is controlled by means of a control unit (21) during weaving, characterized in that the control unit (21) specifies and changes a course of the clamping force with which the ends (9, 12) of the weft threads (5) are held, during weaving and during the ends (9, 12) are held by the clamping device (1, 2) according to at least one predetermined criteria as a function of the angular position of the main drive shaft of the weaving machine, and in that the clamping force is increased at least after or during a cutting-off of the weft threads (5) relative to the clamping force at an insertion of the ends (9, 12) of the weft threads (5) in the clamping device (1, 2).
  2. Method according to claim 1, characterized in that the clamping force of the clamping device (1, 2) is changed according to a pattern of the fabric (3).
  3. Method according to claim 1 or 2, characterized in that the clamping force is changed as a function of a weave pattern of a fabric to be produced.
  4. Method according to any one of claims 1 to 3, characterized in that the weave pattern is determined over several weft cycles as a function of the angular position of a main drive shaft of the weaving machine, taking account of weft patterns and/or binding patterns and/or one or more other patterns that are part of the weave pattern.
  5. Method according to any one of claims 1 to 4, characterized in that the change of the clamping force is as a function of a pattern according to which at least one end (9, 12) of a beat-up weft thread (5) is inserted into a subsequent shed.
  6. Method according to any one of claims 1 to 5, characterized in that the change of the clamping force is as a function of a pattern according to which the ends (9, 12) of a group of weft threads (5) are inserted together in a shed formed after a beat-up of the last weft thread (5) of this group.
  7. Method according to claim 6, characterized in that the clamping force is reduced or eliminated during beating-up the last weft thread (5) of the group.
  8. Clamping device (1, 2) for weft threads (5) for weaving machines, which can be actuated for clamping the ends (9, 12) of the inserted weft threads (5) in sheds by means of a control unit (21) during weaving, characterized in that a device (20) is provided for changing the clamping force, that during weaving and during the ends (9, 12) are held by the clamping device (1, 2) can be actuated by the control unit (21) according to at least one criteria as a function of the angular position of the main drive shaft, and in that the clamping force is increased at least after or during a cutting-off of the weft threads (5) relative to the clamping force at an insertion of the ends (9, 12) of the weft threads (5) in the clamping device (1, 2).
  9. Clamping device according to claim 8, characterized in that the device (20) for changing the clamping force according to a pattern of the fabric (3) can be actuated.
  10. Clamping device according to claim 8 or 9, characterized in that the control ubit (21) is integrated into the control device of the weaving machine.
  11. Clamping device according to any one of claims 8 or 10, characterized in that the one or more criteria under which te control unit (21) actuates the device (20) for changing the ckamping force are specified as a function of a weave pattern of a fabric to be produced (3).
  12. Clamping device according to any one of claims 8 or 11, characterized in that a pneumatically working device (20) is provided for changing the clamping force.
  13. Clamping device according to any one of claims 8 or 12, characterized in that ir is combined with a selvedge apparatus (11, 14) that is preferably controlled by the control unit (21).
  14. Weaving machine, characterized in that it is equiped with a clamping device (1, 2) according to any one of claims 8 to 13.
  15. Weaving machine according to claim 14, characterized in that the clamping device (1, 2) is arranged between a weft cutter (4) and an edge of a fabric (3) to be produced and/or between a waste cutter (7) and an edge of a fabric (3) to be produced.
  16. Weaving machine according to claim 14 or 15, characterized in that between one or both edges of the fabric (3) to be produced and the clamping device (1, 2) a preferably pneumatic selvedge apparatus (11, 14) is arranged.
  17. Weaving machine according to any one of claims 14 to 16, characterized in that the clamping device (1, 2) is arranged in a region in which it clamps not fully beaten-up weft threads (5).
  18. Weaving machine according to any one of claims 14 to 17, characterized in that the clamping device (1, 2) is designed and/or arranged such that it does not detect completely beaten-up weft threads (5).
EP05778062A 2004-09-08 2005-09-08 Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads Not-in-force EP1786963B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2004/0438A BE1016183A3 (en) 2004-09-08 2004-09-08 METHOD AND APPARATUS FOR CLIPPING AN IMPRESSION THREAD IN A WEAVING MACHINE.
PCT/EP2005/009642 WO2006027240A1 (en) 2004-09-08 2005-09-08 Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads

Publications (2)

Publication Number Publication Date
EP1786963A1 EP1786963A1 (en) 2007-05-23
EP1786963B1 true EP1786963B1 (en) 2013-01-16

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Application Number Title Priority Date Filing Date
EP05778062A Not-in-force EP1786963B1 (en) 2004-09-08 2005-09-08 Method for gripping weft threads gripping device and loom with at least one gripper device for weft threads

Country Status (4)

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EP (1) EP1786963B1 (en)
CN (1) CN101027438B (en)
BE (1) BE1016183A3 (en)
WO (1) WO2006027240A1 (en)

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Also Published As

Publication number Publication date
WO2006027240A1 (en) 2006-03-16
CN101027438B (en) 2012-11-14
CN101027438A (en) 2007-08-29
BE1016183A3 (en) 2006-04-04
EP1786963A1 (en) 2007-05-23

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