WO2006092115A1

WO2006092115A1 - Weft thread supplying device for weaving machines, particularly gripper weaving machines

Info

Publication number: WO2006092115A1
Application number: PCT/DE2006/000252
Authority: WO
Inventors: Thomas Fiedlschuster; Jürgen LÄMMERHIRT
Original assignee: Ontec Elektro- Und Steuerungstechnik Gmbh
Priority date: 2005-03-04
Filing date: 2006-02-14
Publication date: 2006-09-08
Also published as: DE102005010534A1; EP1859089A1

Abstract

The invention relates to a weft thread supplying device for weaving machines, particularly gripper weaving machines, comprising a supply spool (4) for the weft thread (6), a thread regulating wheel (2) for compensating for thread use during weft insertion, during which the incoming weft thread (6) is fed to a storage (21) and the weft thread stored therein is withdrawn from the storage (21) by means of the weft inserting elements (12). The aim of the invention is to prevent additional uncontrollable elongations in the weft thread and/or to use distinctly larger supply spools (4) for the weft threads. To this end, the inventive device is equipped with a supply spool (4) whose axis (40) is aligned transversal to the withdrawing direction of the weft thread (6) and is driven by means of a servomotor (41). At least one additional weft thread intermediate storage (3; 7; 26), which is monitored with regard to the storage filling by means of sensors (35, 36; 75; 25), is placed in the thread path between the point at which the weft thread (6) exits the supply spool (4) and the point at which the weft thread exits the storage (21) of the thread regulating wheel (2) for the weft insertion. The sensors (35, 36; 75; 25) are connected to a controller (5, 5', 5', 5' ) or regulator for the servomotor (41) via control lines.

Description

Weft feeder for weaving machines, especially rapier looms

The invention relates to a Schussfadenzuführvorrichtung for weaving machines, especially for rapier looms with a supply reel for the weft, with a feeder for the compensation of the thread consumption during weft insertion, fed to the feeder feeder a Speicherl and the stored weft thread by means of the weft insertion elements from or from the memory is deducted.

The usual arrangement of such a weft feeder is z. As shown in EP 1 106721 B1. The weft yarn is stored by a winding process on a cylindrical memory on Fournisseur and thereby deducted overhead from the stationary and non-rotatable supply spool. He receives by a rotation that is not compensated again on the way to the weft insertion elements. Depending on the changing mean diameter of the supply spools, this rotation changes per unit length of the weft thread. In particular, in the manufacture of fabrics in which the weft thread is substantially involved in the design of the surface or the structure of the fabric, the quality of the fabric is greatly impaired by these unevenly distributed rotations of the weft.

The entry of weft threads in z. B. ribbon shape, whose flat side is to help shape the surface of the fabric, with such a Schusseintrags- vorrichung not feasible.

In order to avoid an uncontrolled overhead take-off of the weft thread from the storage drum by means of weft insertion nozzles, DE 42 19 306 A1 proposes that a driven rear wheel rotating above the head of the storage drum should be used.

RECTlFlED SHEET (RULE 91) ISA / EP holding element to use. The drive is an electric motor that defines the weft thread according to a given movement profile. Such a device increases the accuracy of the length of the individual weft threads. An influence on the rotations within the inserted weft thread does not have such a device.

By WO 01/17886 a device has become known in which the weft thread is withdrawn tangentially from the supply reel. The supply reel is tracked by a friction drive the winder drive of the feeder such that there is always a tension in the thread section between the supply reel and the winder. A disadvantage of this device is that when starting and stopping operations of the weaving machine, which take place almost abruptly the supply reel can not be shut down or accelerated in the available periods ebenfals.

The point between the point of the coil and the winder of the feeder located section of the weft yarn is so heavily loaded that an above-average elongation or even the breakage of the weft thread is not excluded. A reliable operation of the loom - at a reasonably high speed - is not given.

At warp knitting machines, which schussfadenähnliche yarn sheets in several directions in layers parallel to each other - under training so-called. Multiaxial- scrim - are fed, the yarn flocks are pulled off rolling shutters. By avoiding the overhead take-off, the threads do not receive an irregular, permanent twist.

In the embodiment according to WO 96/31428, the threads of all the coils are pulled out of the rolling-off gate by a 3-roller delivery mechanism at an approximately constant speed. The delivery system is continuously driven by means of a controllable motor. The different thread consumption during the laying process is through pneumatically loadable yarn separator for each individual thread balanced. These thread stores are directly upstream of the player. For feeding individual weft threads with high weft insertion frequency and with extremely high insertion speeds, these delivery devices are not suitable. Different coil diameters of the coils lead to different stresses in the weft thread and to different fabric qualities. This deficiency can be prevented by the use of coils with a uniform thread length and with a simultaneous change of the coils. The properties of the yarn, which can not be controlled with the necessary accuracy, lead to different coil diameters and to different insertion lengths of the weft threads. The remnants on the coils cause a significant loss of textile material.

This latter deficiency does not have the device described in DE 100 03 184 A1. Without the use of electronic control or regulation, this device enables uniform and low thread tensions for each individual thread. The different diameters of the coils are largely compensated.

However, an application of this feeding device for the single weft insertion on looms is - as well as in the device according to WO 96/31428 - not possible. The thread loops exciting loose rollers can not release the weft threads with the necessary accelerations and speeds. If the weft thread is registered, the braking of these loose rollers with respect to their position and their rotation is a virtually unsolvable problem.

One of the device according to DE 100 03 184 A1 similar device uses the Fa. LIBA / NAILA for several years for a similar application. In this device, all the coils of the gate, of which the thread is pulled in the tangential direction for the production of a multi-axial Fadengeleges is powered by timing belts by a single variable motor. The coils should have uniform thread lengths and always uniform diameter. Elastic loaded guide elements (dancer rollers) for the thread loops compensate for the different speeds of the thread consumption. This device has the disadvantages with regard to the inertia of the dancer rollers in the same way as the devices of the above-mentioned WO 96/31 428 and DE 100 03 184 A1. It is therefore not suitable for the solution of weft insertion on looms.

The object of the present invention is to propose a weft feeder for looms with short start and brake cycles, the - even at a high weft insertion frequency individually einzutragender weft yarns and the use of very large supply spools - the supply of weft yarns with a defined voltage and without additional and uncontrollable Rotations possible.

This object is solved by the features of claim 1. By, depending on the required thread length controlled drive for each supply reel it is possible to supply the feeder untwisted weft threads. The weft insertion element supplied weft contains no unintentional, and also uncontrollable rotations. Depending on the shape of the thread guide elements used, the weft thread can be incorporated in a defined position in the tissue. The fabric has a much better quality.

The influences of the different diameter of the supply reels can be eliminated even when using very large reels (eg over 25 kg). In this case, high and controlled weft insertion performance on such looms can be realized, which have very short start and acceleration phases. Claims 2 to 3 and 5 show different principles for the design of the monitored additional weft thread buffer. The embodiment according to claim 2 shows a, also manually well manageable and thus monitorable cache.

The embodiment according to claim 3 can be realized with suppliers already produced as standard, the encoders also provide signals for controlling the servomotors.

Claim 4 defines a weft feed in which the weft consumption during each weft insertion cycle is compensated by a feeder with storage drum and coaxial winder. Claim 6, on the other hand, describes a weft feeder in which temporarily, during a weft insertion cycle, excess weft thread is temporarily stored in a storage shaft. This variant has the advantage that thus z. As well as slivers of mutually non-twisted, very thin carbon fibrils can be supplied without destroying their basic structure. Temporarily occurring 'wrong' rotations are avoided with high reliability.

Claim 5 formulated by a dependent variant of claim 4, is increased in the memory of the feeder for the weft insertion to the weft buffer for the start and braking of the loom and the encoder or additional donors are connected to the control or regulating device of the servomotor. This variant has the advantage of the least expense for the structural design of the device.

The invention will be explained in more detail below by exemplary embodiments.

The accompanying drawings show

1 is a schematic overall view of the weft feeder with dancer roller and control separation between the feeder for the weft entry and the coil drive, 2 shows a variant according to FIG. 1 in which the feeder for the weft insertion is linked with the coil drive in terms of control technology.

3 shows a variant in which the memory of the feeder for the weft insertion takes over the function of the weft feeder storage, and

4 shows a variant in which the function of the weft intermediate storage for start and braking operations of the loom are transferred to an additional feeder and

Fig. 5 shows a variant in which the function of the feeder for the compensation of the different weft insertion speed is realized by a disk storage.

In the apparatus of Figure 1, the supply reel 4 is mounted on a horizontal axis 40 transversely to the direction of the weft yarn 6. The supply reel 4 is driven or controlled by servo motor 41 driven. The control process is provided by the control and / or regulating device 5.

The weft thread 6 running tangentially from the supply reel 4 is guided over two deflection rollers 31 in the region of a weft thread interleaving device 3. Between the two deflection rollers 31, a dancer roller 32 deflects the weft thread 6 in the form of a loop extending downwards. The dancer roll 32 is guided along a guide element 33 by means of slides 34.

The position of the dancer roll 32 is monitored by preferably two encoders 35, 36 in two limit positions. The achievement of one of these limit positions is controlled by the controller 5. It derives from the information of the encoder 35, 36 from a change in the speed of the supply reel (4). This rotational speed is adjusted so that the dancer roll 32 lingers over longer periods between the encoders 35, 36 without imparting impulses to the control 5. Instead of the two encoders 35, 36, it is also possible to use so-called analog encoders (not shown, because they are known per se).

The feeder 2 is supplied to the just described manner, the weft 6 continuously with a predominantly constant speed. In the start or braking phases of the loom, the controller 5 provides for appropriate acceleration or braking operations on the supply reel. 4

The dancer roll 32 compensates for shortage or excess thread length of the weft thread temporarily, so that in the acceleration or deceleration phases of the weaving machine, the supply reels 4 can be accelerated or decelerated accordingly slow. It becomes possible to use very large coils 4.

The feeder 2 always receives sufficient weft yarn 6 with reasonably low tension and without undesired additional rotations, regardless of the fast start of the weft insertion elements.

When the weaving machine stops, the weft insertion usually has to be interrupted abruptly. The additionally released by the slower deceleration of a heavy supply reel 4 weft thread is cached by the dancer roll 32 in a larger loop and released again at the next start of the loom. The supply reel 4 can be accelerated more slowly. Additional differences are compensated by the control and / or regulation 5 together with the servomotor 41.

The feeder 2 has the usual structure for weft insertion devices. A winder 22 winds the weft yarn tapering coaxially with the storage drum 21 onto the storage drum 21. The windings thus deposited on the circumference of the storage drum 21 are moved axially parallel to the head of the storage drum. Drum 21 out and there slightly braked pulled off by the annular trigger brake 23 overhead and the drain hole 24 fed.

The weft thread 6 leading rug 11 passes the weft thread 6 the gripper 12. This wears the presented by the guide lever 11 weft 6 finally with a defined voltage and without unwanted rotations in the shed 1 of the loom.

It does not matter how the gripper 12 is driven and guided in the shed. There are rod grippers and tape grippers as well as gripper projectiles. The use of liquid jets or compressed air jets as a weft insertion element is quite possible if the resulting inaccuracies in the weft alignment in the tissue are justifiable.

In the embodiment of the apparatus according to FIG. 1, the weft buffer 3 operates independently of the controller 2. The dancer roll 32 must temporarily compensate for the temporary difference between the average weft consumption and the respective peripheral speed of the supply reel 4.

The embodiment according to FIG. 2 additionally permits a coordination of the weft intermediate storage 3 with the storage of the feeder 2. To realize this coordination, the transmitter 25 and / or the motor of the feeder 2 is connected to the control and / or regulating unit 5 ¹ for the servomotor 41 connected.

The device shown in FIG. 3 dispenses with a weft thread buffer 3 with dancer roller 32. The buffer function for the start and braking operations of the weaving machine assumes the memory 26 at the feeder 2 for weft insertion. As a rule, the memory length must be increased by a corresponding amount, since the supply reel 4 clearly starts slower or is slowed down as the weft insertion device - here the gripper - starts or interrupts the weft insertion. The encoder 25 and / or another encoder 25 'gives the necessary information, which includes a further need or excess weft length, to the controller 5 ". This controls the servomotor 41 - which, as for all other variants - by a Stepper motor can be replaced.

FIG. 4 shows a further possibility for a weft intermediate storage for the slower starting or decelerating supply reel 4. The Fournissseur 2 for the weft insertion is preceded by a second feeder 7 as a weft interleaving storage for the weaving and acceleration processes of the weaving machine. This feeder 7 has a winder 72, a storage drum 71 and at least one encoder 75 for monitoring the storage charge. The coordination of the two feeders 2 and 7 takes over the control and / or regulating unit 5 "', which controls the servomotor 41 on the basis of the information of the encoder 25 and the encoder 75 as well as the current drive parameters of the two motors of the feeders 2, 7.

FIG. 5 shows a weft feeder in which, instead of the Fournisseus 2 - for balancing the weft thread during a weaving cycle - with a cylindrical storage drum 21 and a winder 22, a feeder 8 with storage shaft 81, with delivery mechanism 82, is provided with fold 83 and conveyor belt 84.

The delivery unit 82 promotes the weft yarn with approximately constant speed, which is approximately proportional to the speed of the loom, via the oscillatingly driven fold 83 in the storage slot 81. The conveyor belt 84 supports the movement of the folds in the lower space of the storage slot 81, from where the Weft is inserted by means of gripper 12 of the loom in the shed 1. Sensors 85 and 86 monitor the minimum and maximum levels of the memory slot 81 and cause the controller 5 the drive motor 82 driving motor M1 to a faster or slower rotational movement.

This device according to FIG. 5 has the advantage that so-called intermittent "false" rotations in the weft thread are avoided. Also avoided are sharp distractions of the weft before weft insertion into the shed. This is particularly noticeable in the processing of carbon ribbons. Their loose structure of extremely many, extremely smooth and extremely thin filaments is not destroyed by the winding process. Rather, their structure within the storage slot 81, which is bounded laterally by plates, largely retained. The ribbon-shaped weft threads are undiluted and registered in their original structure in the shed and tied between the warp threads.

Claims

claims

1. Weft feeder for weaving machines, in particular rapier looms with a supply reel (4) for the weft thread (6), with a feeder (2, 8) for the compensation of the thread consumption during weft insertion, in which the incoming weft thread (6) fed to a memory and the weft thread stored there is then drawn off or out of the store by means of the weft insertion elements (12), wherein the supply reel (4) is rotatably mounted with its axis (40) transversely to the withdrawal direction of the weft thread (6), wherein the supply reel (4) with a servo motor (41) is drivingly connected, wherein in the yarn path between the run-off point of the weft thread (6) from the supply reel (4) and the end point of the weft thread from the memory of the feeder (2) for the weft insertion at least one further, in terms of memory filling weft thread buffer (3; 7; 26) monitored by means of encoders (35,36; 75; 25), and wherein the encoder (s) (35,36; 75; 25 ) are connected to a control (5, 5 \ 5 ", 5" ¹ ) or control for the servo motor (41) for driving the supply reel (4) via control lines.

2. weft feeder according to claim 1, characterized in that the weft intermediate storage (3) has a guided and elastically loaded dancer roll (32) or thread rocker which deflects the weft thread (6) between deflection rollers (31) laterally and that along the Auslenkweges the dancer roll ( 32) or the thread rocker at least two encoders (35, 36) or an analogue encoder arranged are / are, in turn, connected to the control unit (5, 5 ¹ ) for the servomotor (41).

3. weft feeder according to claim 1, characterized in that the weft thread buffer from a feeder (7) for the compensation of the thread consumption during start and braking operations of the loom and that the encoder (75) of the feeder (7) for the level indicator of the thread store Also connected to the controller (5 ¹¹¹ ) or control of the servomotor (41).

4. weft feeder according to claim 1, characterized in that the Fornisseur (2) for balancing the weft speed during the weaving of a storage drum (21) and a coaxially arranged, controlled driven, rotating winder (22).

5. weft feeder according to claim 1 and 4, characterized in that the weft thread buffer (26) for the compensation of the thread consumption in the start and braking operations on the storage drum (21) of the feeder (2) is arranged for the weft insertion and that the encoder ( 25) for monitoring the memory size of the feeder (2) for the weft insertion and / or an additional encoder (25 ¹ ) in this area with the control unit (5 ") of the servomotor (41) is connected.

6. weft feeder according to claim 1, characterized in that the Fornisseur (8) for the compensation of the weft thread speed during the weaving of a storage shaft (81) and a delivery mechanism (82).