EP1675987B1 - Method for selecting and feeding weft yarns, and a rapier weaving machine equipped with a device for selecting and feeding weft yarns - Google Patents

Abstract

In a rapier weaving machine, a device (16) is provided for selecting and feeding weft yarns (14), which contains a number of yarn feeders (19) that can be displaced out of a position of rest (A) and into a working position (B). These yarn feeders, in working position (B), lay a weft yarn, which extends between a supplying device and a selvage, around a diverting edge (31), which is placed between the selvage and the feeders and which runs at least approximately in the direction of motion of the gripper (11) so that the gripper grips this section (14a) of the weft yarn (14) between the diverting edge (31) and the feeders (19).

Description

The invention relates to a method for selecting and delivering weft threads to a gripper of a rapier weaving machine, which receives weft threads and enters into a shed, wherein the weft threads, which extend from the region of a fabric edge to a delivery device, movable by means of from a rest position to a working position Feeding be brought into a receiving position for the gripper and a device for carrying out the method.

It is known ( EP 0161014 B1 ) to lay a thread extending between a selvage and a delivery device by means of a feeder over a deflection edge and to introduce it by means of a so-called rapier during its movement into a shed into this shed. The Bringergreifer grips the thread to be introduced between the deflecting edge and the fabric edge with a located on its top gripping device.

It is also known ( EP 0906461 B1 ) to place the weft to be inserted into a shed by means of a feeder over a deflection edge which is located between the fabric edge and the feeder. The weft thread is detected by means of a Bringergreifers on both sides of the deflecting edge and taken from the moving into the shed Bringergreifer.

It is further known ( EP 1020550 A1 ) to take a weft thread extending from a selvage to a delivery device and brought by means of a feeder into a receiving position by means of a bringer rapier and to insert it into the shed. The Bringergreifer takes up the weft and brings him first in one Thread clamp to ensure that proper clamping is obtained in the weft gripper. Between the fabric edge and the thread clamp, a cutting device with a rotating blade is arranged, which separates the weft to be introduced before it leaves the thread clamp.

It is also known to register a weft thread to be inserted into a shed by means of a gripper gripper in the shed, ie by means of a gripper, which is inserted from the opposite side of the delivery device for weft empty side in a shed and the weft thread moves into the shed when he moved out of the shed again. In a known Type (FR 1538375 ) are arranged a plurality of yarn feeders in a row one behind the other on a movable carriage in the direction of movement of the gripper, so that the yarn feeder, which provides the weft thread to be introduced, can be brought into a position above the gripper. This thread feeder is then lowered so that the gripper grasps the weft thread between a fabric edge and the feeder. During insertion, the thread passes over a hook-shaped knife, and is severed between the fabric edge and the gripper. With another Type (US 3299909 ), several weft threads coming from the delivery device are held between eyes and thread clamps. These eyes and thread clamps are located on a transversely movable to the movement of a gripper gripper carriage, so that the yarn section located between the thread clamp and the eye can be brought over the region of the gripper, which is provided on its upper side with a hook. The selected feeder element is then lowered into the area of the gripper. In another construction of this type, weft threads extending from a fabric edge to a delivery device are associated with thread feeders which are vertically adjustable between a rest position and a working position. These tributaries are in a row arranged one behind the other, which runs parallel to the direction of movement of a gripper rapier. The weft thread (s) selected for a weft insertion are first displaced downwardly from their feeders to an area in which they can be taken over by a feed arm which makes a pivoting and lowering movement. The Zustellarm brings the selected weft threads always in the same position in which they can be gripped by the provided on its upper side with a driving device gripper. It is further known ( US 3,147,778 ), in the striking of a weft thread to separate the ailing weft thread from the weft thread coming from the delivery device and to receive with a common suction device. The weft thread to be inserted is selected by means of a thread feeder, which is lowered to bring the selected weft thread in the region of a gripper rapier, which is also provided on its upper side with a hook-shaped receptacle for the weft.

The invention has for its object to provide a method of the type mentioned above, which performs the selection and delivery of a weft thread in its receiving position with simple movements, with only a small footprint is required for the individual elements including the gripper and its guide elements, so that a relatively small shed is sufficient and the shed means and the reed can be designed accordingly small.

This object is achieved in that the feeders put the respective weft thread when moving from its rest position to its working position over a deflecting edge extending at least approximately in the direction of movement of the gripper, so that the portion of the weft thread between the deflecting edge and the feeder in a receiving position in the Movement path of the gripper is brought.

In an advantageous embodiment, it is provided that the gripper is a gripper gripper, which pulls out a weft thread into the shed by means of a movement out of the shed. Such a gripper gripper requires only a relatively small cross-section, so that the distance between the feeders and the deflecting edge can be dimensioned correspondingly small.

In a further embodiment of the invention, it is provided that the feeders bring the respective weft thread into the receiving position before the gripper reaches a takeover position, and that the gripper deflects the weft thread located in the picking position substantially downwards and, after reversing its movement, grips and takes along , In this embodiment, a relatively large period of time is available, within which a weft thread can be brought into its receiving position.

With the method according to the invention, an advantageous gripper loom can be provided, which is provided with a device for selecting and delivering weft threads and which is characterized in that a deflection edge for the weft threads extending at least approximately in the direction of movement of the gripper is arranged between the fabric edge and the feeders , And that the trajectory of the gripper runs between working position feeders and the deflecting edge. Such a weaving machine is particularly advantageous when a gripper gripper is provided, which can be inserted from the opposite side of the device for selecting and delivering in a shed of the weaving machine.

In a further embodiment of the invention it is provided that the feeders are arranged in a row one behind the other stationary, which runs substantially parallel to the deflection edge. This makes it possible to have all weft threads in substantially equal positions to the gripper To be brought, which is designed so that its hook-shaped gripping element over the held by the last feeder of the row weft out addition. The arrangement of the weft threads between feeder and deflection is advantageous for gripping the weft threads.

Fig. 1

zeigt eine Ansicht in Richtung eines Schusseintrages auf eine erfindungsgemäße Vorrichtung zum Auswählen und Zustellen von Schussfäden,

Fig. 2

eine Draufsicht auf die erfindungsgemäße Vorrichtung nach Fig. 1,

Fig. 3 bis 6

Draufsichten, ähnlich Fig. 2 auf die Ausführungsform nach Fig. 1 und 2 während der Übernahme eines Schussfadens und des Beginns eines Eintragens,

Fig. 7

eine Ansicht ähnlich Fig. 1 auf eine abgewandelte Ausführungsform,

Fig. 8

eine perspektivische Ansicht der Ausführungsform nach Fig. 7,

Fig. 9

eine Ansicht ähnlich Fig. 1 auf eine weitere abgewandelte Ausführungsform und

Fig. 10

eine Draufsicht auf eine erfindungsgemäßt Vorrichtung, die einen Breithalter und einen Kanteneinleger enthält.

Further features and advantages of the invention will become apparent from the dependent claims and he following description of the embodiments illustrated in the drawings.

Fig. 1

shows a view in the direction of a weft insertion on an inventive device for selecting and delivering weft threads,

Fig. 2

a plan view of the device according to the invention Fig. 1 .

Fig. 3 to 6

Top views, similar Fig. 2 to the embodiment according to Fig. 1 and 2 while picking up a weft and starting a pick,

Fig. 7

a view similar Fig. 1 to a modified embodiment,

Fig. 8

a perspective view of the embodiment according to Fig. 7 .

Fig. 9

a view similar Fig. 1 to a further modified embodiment and

Fig. 10

a plan view of an inventive device containing a spreader and an edge insert.

In Fig. 1 and 2 is shown by the actual loom, only a rapier band 10 or a rapier rod, which carries at its end designed as a gripper grab gripper 11. The weaving machine forms of warp threads 12, 13 and weft threads 14 a fabric 15, which is indicated only schematically. The weft threads 14 are struck with a reed, not shown, to a cloth edge. To enter a weft thread 14, the warp threads are moved apart by means not shown shed forming an upper Kettfadenschar 13 and a lower Kettfadenschar 12, so that a shed is formed, in which a weft thread 14 can be entered. The insertion of the weft thread by means of the gripper gripper 11, which is inserted from the side into the shed, which is opposite to the side on which the weft threads 14 are kept ready. The gripper rapier 11 takes during its movement out of the shed out one, possibly even more, weft threads 14 with.

The weft thread 14 to be inserted in a shed during a weft insertion is selected by means of a device 16 and delivered to the gripper 11. The device 16 has a base body or a base plate 17, which is fastened by means of screws 39 on a running in the direction of weft insertion rail 38. On this rail 38, the base plate 17 can be moved with the elements mounted on it and fixed in a matched to the fabric width position. The entire device 16 is therefore adaptable in a very simple manner to a changed fabric width.

The device includes needle-shaped yarn feeders 19, the drives 20 of which are mounted on a holder 21 and which extend downwardly at an acute angle so as to be able to move downwardly substantially in the vertical direction. The drives 20 of the yarn feeders 19 may for example be formed as shown in EP 0598264 B1 is known, so that the yarn feeder 19th between a rest position A ( Fig. 1 ) and a working position B are adjusted. The thread feeders 19 are each provided at their lower ends with eyelets 22 through which a weft thread 14 runs. The weft threads 14 extend from a fabric edge of the fabric 15 through the eyelets 22 in each case to a delivery device, for example in each case to a feeder.

On the base plate 17, a bar 23 is mounted on which a thread separating device 24 is arranged. The thread separating device 24 has a knife disc 25 which is driven by means of an electric motor 26. The knife disk 25 are associated on both sides with thread guides, which are formed by means of the strip 23 and guide tongues 28, 29.

On the base plate 17 of the device 16, a further strip 30 is attached, which forms by means of a upstanding leg a deflection edge 31 which is parallel to the direction of movement of the gripper 11, ie transversely to the direction of the warp threads 12, 13. As seen Fig. 1 can be seen, the deflection edge 31 is in a plane with a binding point 32 of the fabric 15 and with the thread guides formed by the strip 23 and the guide tongues 28, 29.

How out Fig. 2 can be seen, the base plate 17 is adjustable in the rail 38 in the direction of the fabric width. The mounting for fixing screws 39 ( Fig. 2 ) of the base plate 17 are directed transversely to the rail 38 slots, so that a setting in the transverse direction is possible. With this setting, the position of the yarn feeders 19 and thus their eyelets 22 is adjusted transversely to the gripper 11. The strip 23 with the cutting device 24 is fixed both transversely and in the longitudinal direction of the warp threads adjustable on the base plate 17. It is thus their position with respect to the distance to the deflection edge 31 in the transverse direction and with respect to the distance to the end the deflection edge 31 in the longitudinal direction adjustable. In practice, it is preferably provided that the adjustment of the strip 23 with the cutting device 24 and the strip 30 with the deflection edge 31 relative to each other and to the feeders in the manufacturer is made and that then the strips 23, 30 are fixed in this position in that they can not or only with difficulty be changed by the user. This can be done, for example, by providing fastening screws with specially designed tool engagement surfaces. It is also possible to seal the positions. The user of a loom can then adjust only the entire device 16 in the direction of the weaving width and possibly also transversely thereto to a small extent. To ensure that a user on his loom, an adjustment of the device 16 in the transverse direction to the rail 38 can not readily make it can be provided that the adjustability is separated in the transverse direction of the attachment to the rail 38, so that then the weaving machine only an adjustment of the device 16 in weaving width is possible.

How out Fig. 1 can be seen, are the weft threads 14 when the feeders 19 with their eyes 22 are in the rest position A, above the gripper 11, the deflection edge 31 and the cutter 24 is a feeder 19 transferred to its working position B, as the in Fig. 2 to 6 is shown for the fabric edge of the next feeder conveyor 19, the respective weft thread 14 is placed over the deflection edge 31 so that it is located below the tip 33 of the gripper 11 with an obliquely downwardly extending portion 14a. The gripper 11 overflows this section 14a and deflects it downwards. When the gripper 11 is moved back, so he takes the thread portion 14 a with its hook-shaped element 34, the one in Fig. 2 to 6 only schematically indicated thread clamp 35 is assigned. The hook-shaped element 34 and the thread clamp 35th located on the side facing the portion 14a of the weft thread 14, ie below the top of the gripper 11th

The gripper 11, which moves back into the shed, takes along the weft thread picked up on the section 14a and pulls it over the deflecting edge 31 in the direction towards the shed. In this case, the weft thread 14 passes into the cutting device 24, in which the weft thread is severed by the portion remaining at the edge of the fabric before it is introduced into the shed.

The selection of the weft 14 to be inserted, i. the transfer of a feeder 19 from its rest position A to its working position B is controlled by a control device 36, which conveniently belongs to the device 16 and is attached thereto. The controller 36 receives its commands from the control of the loom. The controller 36 also turns on the motor 26 of the cutter disk 25. This can be done individually or at high firing speeds as a continuous operation at each weft insertion.

The yarn feeders 19, of which only four are shown, are arranged in a row one behind the other. This row runs parallel to the movement path of the gripper 11 and the deflection edge 31. Since the feeders 19 each occupy the same working position B, the thread pieces 14a extend between the eyelets 22 and the deflection edge 31 in the side view (FIG. Fig. 1 ) all at the same angle, even if the angle between the eyelets 22 and the fabric edge ( Fig. 2 ) is different. The gripper 11 thus engages with its hook-shaped element 34 and the clamp 35, the thread sections 14 a always in the same manner.

In the apparatus according to the invention, the yarn feeders 19 move downwards with a component of motion, so that they Lay weft threads over the deflection edge 31. This may, like that in Fig. 1 is shown, done by the fact that the feeders 19 are aligned at an acute angle. Of course, it is also possible to arrange the feeders so that they are vertically aligned and perform an exclusively vertical movement.

As a rule, there is sufficient space in weaving machines in the direction of the weaving width in order to arrange a multiplicity of yarn feeders 19 in a row. However, it is also possible to arrange the yarn feeders 19 in more than one row. In order to achieve the most uniform conditions for receiving the thread sections 14a by the gripper 11, it is then appropriate to lower the thread feeders 19 of the deflecting edge 31 arranged at a greater distance row a little deeper, so that the thread sections 14a between the eyelets 22 and the Deflection 31 always extend at the same angle as possible. However, differences of a few degrees are easily compensated because the gripper deflects the thread section located in the receiving position downwards.

In the embodiment according to Fig. 1 to 6 it is provided that the weft threads 14 are separated from the fabric edge only when they are re-entered in a shed. However, it is also possible to introduce each weft thread in the hitting the edge of the goods in a separator and separate. In this case, the free ends are then picked up by a thread clamp. Such a thread clamp, which is arranged between the fabric edge and the cutting device 24, is then part of the device 16 in such an embodiment.

It should be noted that in the embodiment according to Fig. 1 to 7 the device 16 and also the distances between the cutting device 24 and the tissue exaggerated shown have been made in order to obtain a comprehensible presentation. In practice, however, much smaller distances are possible, especially between the working position B of the yarn feeder and the deflection edge 31st

The embodiment according to Fig. 7 and 8th corresponds in principle to the embodiment according to Fig. 1 to 6 , For the feeders 19 and their drives 20, a holder 37 which is inclined in the direction of the deflection edge 31 is provided so that altogether shorter needle-shaped feeders 19 can be used. Another difference is that the strip 23 is combined with the cutting device 24 and the strip 30 with the deflection edge 31 to form an assembly that is adjustable only relative to the base plate 17 and the feeders 19 together.

According to the embodiment Fig. 9 Fadenzubringer 19 are provided which are pivotable by means of drive motors designed as drives 20 between a rest position A and a working position B. The eyelets 22 of the yarn feeder 19 thereby move on a trajectory, according to the trajectories of the embodiments Fig. 1 to 6 and Fig. 7 and 8th largely corresponds. The axis 40 of the drive motors is lower than the deflection edge 31, so that the thread portion 14a is well tensioned as well as in the other embodiments, which is brought into a receiving position in the path of movement of the gripper 11.

In the embodiment according to Fig. 10 is initially different from the embodiment according to Fig. 1 and 2 instead of a rotating cutter disk 25, a blade 55 is provided which preferably has a razor-sharp cutting edge. This blade 55, which is easily replaceable, is oriented so that a weft thread 14, which is taken by the gripper 11, slides over the cutting edge of this blade 55 and thereby is cut. This cutting device 24 with the stationary blade 55 requires no drive.

In addition, in the embodiment according to Fig. 10 attached to the base plate 17 is a holder 57 which carries a fabric spreader 56. The holder 57 is fastened with adjustable fastening means 59 on the base plate 17, for example, with fastening screws 59, the slot guides of the holder 57 and transverse thereto slot guides of the base body 17 penetrate.

In a corresponding manner may be attached to the holder 57 and an edge insert 58, which is indicated by dashed lines. The edge insert 58 may be mounted in a manner not shown by means of adjustable fastening means on the holder 57.

In many cases, it will therefore be sufficient only to adjust the holder 17 when changing over to a changed fabric width, whereby at the same time the thread feeders 19, the cutting device 24, the spreader 56 and the edge insert 58 are adapted to the changed fabric width.

According to the embodiment Fig. 1 to 6 , in the embodiment according to Fig. 7 and 8th and in the embodiment according to Fig. 9 it is provided that the Fadenzubringer 19, which is in the working position B, is moved back to an intermediate position between the working position B and the rest position A, when the portion 14a of the weft thread 14 has been picked up by the gripper 11 and is entered into the shed , This ensures that the withdrawal of a weft thread which takes place through the thread eye 22 located in the intermediate position is not disturbed by the other weft threads and this weft thread is held in a favorable position within the shed.

Claims (12)

1. Method for selecting and presenting weft yarns (14) to a gripper (11) of a rapier weaving machine, which picks up weft yarns and inserts them into a shed, wherein the weft yarns, which extend from the area of a cloth edge to a delivery device, are brought by means of presenters (19), movable from a rest position (A) into a working position (B), into a pick-up position for the gripper (11), characterised in that, the presenters (19) lay the respective weft yarn (14) on moving out of their rest position (A) into their working position (B), over a deflecting edge (31) extending at least approximately in the direction of movement of the gripper (11), such that the portion of the weft yarn (14) between the deflecting edge (31) and the presenter (19) is brought into a pick-up position in the movement path of the gripper (11).
2. Method according to claim 1, characterised in that the gripper is a receiving gripper (11), which draws a weft yarn (14) into the shed by means of a movement out off the shed.
3. Method according to claim 2, characterised in that the receiving gripper (11) brings the portion of the weft yarn (14), which extends therefrom to the area of the cloth edge into a cutting device (24).
4. Method according to any one of claims 1 to 3, characterised in that the presenters (19) bring the respective weft yarn (14) into the pick-up position before the gripper (11) reaches a transfer position, and that the gripper (11) deflects the weft yarn (14) located in the pick-up position essentially downwards and grips it and takes it along after reversal of its movement.
5. Method according to any one of claims 1 to 4, characterised in that the yarn presenter (19) is transferred into an intermediate position located between rest position (A) and working position (B) during insertion of a weft yarn (14).
6. Rapier weaving machine having a device for selecting and presenting weft yarns (14), which comprises a plurality of presenters (19) movable from a rest position (A) into a working position (B), which, in the working position, hold a weft yarn (14) extending between a delivery device and a cloth edge area ready in a pick-up position for a gripper (11), characterised in that a deflecting edge (31) for the weft yarns (14), which deflecting edge extends at least approximately in the direction of movement of the gripper (11), is arranged between the cloth edge and the yarn presenters (19), and wherein the movement path of the gripper (11) extends between yarn presenters (19) located in the working position (B) and the deflecting edge (31).
7. Rapier weaving machine according to claim 6, characterised in that a receiving gripper (11) is provided, which may be introduced into a shed of the weaving machine from the opposite side of the selecting and presenting device (16).
8. Rapier weaving machine according to claim 6 or 7, characterised in that a cutting device (24) is provided between the deflecting edge (31) and the cloth edge, the cutting device being arranged at a smaller distance from the cloth edge than the yarn presenters (19).
9. Rapier weaving machine according to claim 8, characterised in that the cutting device (24) comprises a rotationally driven cutter disk (26).
10. Rapier weaving machine according to any one of claims 6 to 9, characterised in that a connecting line between the deflecting edge (31) and a yarn guide (22) of a yarn presenter (19) located in the working position (B) lies under a tip (33) of the gripper in the direction of movement of the gripper (11) and inside the contour of the gripper (11).
11. Rapier weaving machine according to any one of claims 6 to 10, characterised in that the yarn presenters (19) are arranged stationarily in a row one behind the other, which row extends essentially parallel to the deflecting edge (31).
12. Rapier weaving machine according to any one of claims 6 to 11, characterised in that the yarn presenters (19) may be stopped in an intermediate position located between rest position (A) and working position (B).

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