Classifications

• • 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 loom is known from EP 0284766 A1.
• 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 actuates 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 during weaving of certain woven fabrics, in particular when weaving terry fabrics in which the ends of the weft threads are laid by means of an edge apparatus to insertion edges.
• the invention is based on the object that terminals of weft threads are designed so that it is suitable for practically any type of fabric.
• the clamping force of the clamping device is changed during weaving according to at least one predetermined criterion.
• the change is made according to a pattern of the fabric.
• 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 as a function of 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 erfindungsge ⁇ Permitted method comprises the introduction of at least one end of an ⁇ beaten weft thread in a subsequent shed and changing the clamping force of the clamping device according to a Mus ⁇ ter, depending on the insertion of the at least one end of the tarnished weft thread can be adjusted.
• Such a method is advantageously used when jointly inserting a plurality of weft thread ends of successively struck weft threads into a subsequent shed. As a result, the ends of the weft threads can also be inserted regularly at the edge of the fabric.
• the change in the clamping force is effected as a function of a pattern, according to which the ends of a group of weft threads are inserted together into a shed formed after striking the last weft thread of this group.
• This embodiment is particularly suitable for weaving terry fabrics. - O -
• a clamping device which includes means for changing the clamping force, which is operable during weaving by a control unit according to at least one criterion.
• the pressing is done according to a pattern of the fabric.
• a pneumatically operating device for changing the clamping force preferably comprises a compressed air 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 simultaneously comprises an edge apparatus in order to introduce one end of a damaged weft thread, which was clamped in the clamping device, into a subsequent shed.
• the clamping device is controlled so that one end of a weft thread can optimally be inserted into a subsequent shed.
• the clamping device according to the invention is particularly advantageous when it is used in weaving fabrics in which several ends of groups of weft threads are laid by an edge apparatus together in a subsequent shed.
• this weaving machine includes a clamping device, which is arranged between a weft cutter and an edge of the fabric to be created, and / or a clamping device, which is arranged between a scissors and an edge edge of the fabric to be created.
• the weaving machine also includes an edge apparatus for transferring the ends of a weft thread which had been clamped in the clamping device into a subsequent weaving machine. fold in.
• a pneumatic edge apparatus is vor ⁇ seen.
• 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 a region in which it does not clamp completely damaged weft threads.
• the clamping force is reduced or canceled when a weft thread is completely folded, so that the weft threads which are not fully worn can easily be taken along.
• 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 completely damaged weft thread so far that with this weft thread the previously inserted, not completely damaged weft threads can be taken along, which then leave the clamping device during complete stop and move from the edge apparatus into a following one Shelf can be inserted.
• FIG. 1 shows a schematic representation of part of a weaving machine according to the invention
• FIG. 3 shows an enlarged detail of FIG. 1 in a first position of a weaving cycle
• FIG. 4 shows the detail according to FIG. 3 in a further position of the weaving cycle
• FIG. 5 shows the detail of FIG. 3 in a further position of the weaving cycle
• FIG. 6 to 8 sections similar to FIG. 3 in different positions of a weaving cycle when creating a fabric according to an ⁇ their weave pattern
• Fig. 9 is a detail of a clamping device similar to Fig. 2 in and 10 a modified embodiment.
• a loom is schematically shown, the two erfin ⁇ Dungssiee clamping devices 1, 2 contains.
• the clamping device 1 is mounted between a fabric 3 and a weft scissors 4, the ab ⁇ a registered weft 5 from a thread supply 6 ab ⁇ cuts.
• 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 insertion side, is clamped by means of the clamping device 1 and then inserted by means of an edge apparatus 11 into 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 - in the direction of the warp threads 16 gese ⁇ hen - arranged at a distance from a stop line 15, so that each clamping device 1, 2 not completely damaged weft 5, ie a not posted to the stop line 15 - -
• Stop line 15 is here understood to mean the line at which a reed 17 strikes a weft thread 5 completely on the fabric 3, the so-called edge of the fabric.
• the weaving machine shown in FIG. 1, which is, for example, an air jet weaving machine, contains warp threads 16 with which successive sheds are formed in a known manner with shed-forming means into which weft threads 5 are inserted.
• the reed 17 contains in a known manner profiled blades which have a U-shaped recess aufwei ⁇ sen to form a weft yarn guide channel.
• the weaving machine has at least one main nozzle 18 to register the weft threads in the looms formed from the warp threads 16.
• the clamping device 1 shown in Fig. 2 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 weaving machine.
• the device 20 contains a compressed air cylinder 22, which acts together with a movably mounted clamping part 30 of the clamping device 1 zu ⁇ together. 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 fixedly mounted clamping part 31 lying opposite 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 compressed air cylinder 22, which can press the clamping parts 30 and 31 against each other.
• the illustrated compressed air cylinder 22 is single-acting, ie it is actuated in one direction (preferably the clamping direction) via compressed air and reset in the other direction by means of a restoring 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 is 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.
• the pressure regulator 32 is a proportional pressure regulator which forwards compressed air with a pressure which corresponds 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 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.
• each relevant 3/2-way valve 33 is controlled, which is connected to a set to the desired pressure pressure regulator 32.
• 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 pressure cylinder 22 engages the arm 43 at a location which lies between the pivot joint 36 and the point of the clamping part 30 which clamps a weft thread.
• 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 shearing 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 - -
• the drive shaft 40 extends parallel to the weft direction and to the axis of the joint 36.
• the clamping device 2 is preferably designed and designed in the same way as the clamping device 1.
• the waste scissors 7 is also carried out in the same manner as the weft scissors 4 and attached together with corresponding clamping members 30, 31 and a corresponding Druck ⁇ 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 Kan ⁇ tenapparat 11 has a device housed in a Blasvor ⁇ direction 27 to insert the end 9 of a registered weft thread 5 in a subsequently formed shed.
• the blower 27 be ⁇ sits 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 to 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 insertion of this weft thread 5.
• the blowing device 27 and the valve unit 25, which are part of the edge apparatus 11, can be designed, for example, in the same way as described in the patent application WO 01/86047.
• the edge apparatus 14 (FIG. 1) arranged on the opposite side of the fabric 3 has, for example, the same configuration as the edge apparatus 11. According to Fig. 3 to 5, the devices operate as follows. After the weft thread 5 has been introduced, it is displaced by the reed 17 in the direction of the warp threads 16.
• the end 9 of the weft thread 5 reaches in this way between the clamping parts 30, 31 of the Klemmvor ⁇ direction 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 blows the end 9 into a subsequent shed (FIG. 4).
• weft thread 5 is inserted into this shed (FIG. 4).
• the following weft thread 5 is then taken along with the blown-in end 9 of the previously inserted weft thread 5 by the reed 17 and struck (FIG. 5).
• the end 12 of the weft thread is clamped by means of the clamping device 2, by means of the waste separator 7 cut off and inserted by means of the edge apparatus 14 in the subsequent weaving 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 as a function of the angle position of the main drive shaft of the weaving machine 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.
• the end 9 and / or 12 of a group of weft threads which have been successively inserted and struck are usually placed together in a subsequent shed.
• the weft threads 5 of a group are inserted one after the other and struck in each case at a position 19 which lies at a clear distance from the stop line 15 and which, for example, as a preliminary position impact position 19 is designated.
• 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 must 1 and 2 can 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 last weft thread of a group is introduced, for example, third weft thread 5.
• 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 a full stop is executed.
• the ends 9 and 12 of the group of weft threads are subsequently inserted into a subsequent shed at the same time, as shown in FIG. 8.
• the ends 9 and 12 of the group of weft threads can be inserted together with the help of an edge apparatus 11 or 14, the ends 9 or 12 must be positioned exactly to the edge emper 11 or 14 before being inserted. 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 shot entry and the ends 9 or 12 cut after cutting in the desired position to be held by the clamping device 1 or 2 with a desired clamping force.
• the ends 9 and 12 of the weft threads 5, which are beaten up to the preliminary stop, are clamped with a relatively high clamping force in the clamping devices 1 and 2 in order to hold them securely.
• the clamping force of the Klemmvor ⁇ devices 1 and 2 is reduced, so that the ends 9 and 12 of the previously ein ⁇ worn weft threads together with the ends 9 and 12 of zu ⁇ last registered weft thread ange ⁇ with the full stop will be able to slide between the clamping parts 30, 31 of the clamping devices 1 and 2. If the clamping force would be kept too high in the full stop, there is a risk that the already clamped ends 9 and 12 will be 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 in accordance with a pattern in which the clamping force is relatively large at the pre-stop and the clamping force is relatively low at full stop, there is the advantage that the ends of the weft threads after sufficient in each case Are not held 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. In the above example, a three-weft poling pattern is mentioned.
• a Pol Struktur ⁇ pattern can be selected with a different number of weft threads, spielnem a Pol Struktursmuster in which three successive 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 so ange ⁇ controls 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 weaving machine.
• 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 tightening 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 devices 1 and / or 2 slightly 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 from the blowing device 27 in a subsequently formed Web ⁇ fold.
• the clamping force is essentially changed depending on the angular position of the main drive shaft of the weaving machine.
• the clamping force of the Klemmvor ⁇ direction 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 shot Thread selected a greater clamping force than for a thicker weft thread. 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. If, on the other hand, there is a considerable difference between the number of warp threads of the upper side and the lower side, the clamping force is selected and set relatively large.
• the clamping force can be changed except as a function of the weft pattern, the angular position of the main drive shaft, the terry pattern, the Bordürenweb, other parameters of the tissue to be produced and combinations of the above Pa ⁇ parameters of the fabric to be produced, beispielswei ⁇ se in dependence from the warp tension, the weft tension, the pile height of the loops of the terry cloth, 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 predetermined as a function of the angular position of the main drive shaft of the weaving machine and adjusted in each case corresponding to the angular position. For example, if 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 fabric boring with ten weft threads, the webmusic from 170 weft entries. For each weft insertion, a profile 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, the clamping force is then adjusted in accordance with the associated angular position of the main shaft of the weaving machine. This measure is referred to as a weaving pattern of the fabric to be produced.
• the clamping device 1 is mounted in such a position that it cooperates with an end 9 of a partially damaged weft thread 5, i. with a weft thread 5 which is struck up to the advance position 19.
• the clamping device 1 is further arranged so that it does not act on a completely damaged weft thread, i. on a weft that has been posted to the stop line 15.
• the clamping parts 30 and 31 of the Klemm ⁇ device 1 are arranged and designed so that they do not cooperate in the area in front of the stop line 15, i. do not clamp.
• the clamping device 1 is provided with a recess 45 in the region of the clamping parts 30 and 31.
• This embodiment makes it possible, for example (FIG. 9), to clamp two ends 9 of a weft thread 5, which were struck up to the preliminary stop 19. These two ends 9 are then taken in 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.
• 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 the area of the recess 45. They are then no longer clamped and can then be inserted together with the aid of an edge apparatus 11 into a subsequent shed. Since the ends 9 of the weft threads 5 are no longer clamped in any case, it is not necessary to reduce the clamping force of the clamping device 1 in the insertion operation carried out by means of the edge apparatus.
• a recess 45 according to FIGS. 9 and 10 can also be used in a clamping device 2.
• 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 can also be determined as a function of successive positions of the warp threads or in another known manner.
• the change in the clamping force is usually associated with an actual relative movement of the clamping parts 30 and 31 relative to one another. 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. However, a relative movement between the clamping parts 30 and 31 of the clamping device 1 or 2 when changing the clamping force will then take place when an elastic weft thread is clamped. - -
• the invention is not limited to an application of Lucasdüsenwebma ⁇ machines. Rather, it can be used in any type of weaving machines, for example rapier weaving machines, rapier shuttle looms, water jet looms, projectile weaving machines, multiphase weaving machines 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 only as an example. Rather, modifications and / or combinations can be made within the scope of the teaching of the claims without the scope of protection being abandoned.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34973968

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (7)

Family Cites Families (8)

• 2004
  • 2004-09-08 BE BE2004/0438A patent/BE1016183A3/nl not_active IP Right Cessation
• 2005
  • 2005-09-08 EP EP05778062A patent/EP1786963B1/de not_active Not-in-force
  • 2005-09-08 CN CN2005800301173A patent/CN101027438B/zh not_active Expired - Fee Related
  • 2005-09-08 WO PCT/EP2005/009642 patent/WO2006027240A1/de active Application Filing

Patent Citations (7)

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events