DE20113230U1 - Bobbin magazine for weft supply bobbins on rapier weaving machines - Google Patents

Description

se, S01111-ENG 7 August 2001

SCHONHERR

Textile Machinery Construction GmbH 09113 Chemnitz

"Spool magazine for weft supply spools on rapier weaving machines"

The invention relates to a bobbin magazine for weft thread supply bobbins on rapier weaving machines with bobbin holders which can be moved along a circulating path at a distance of a bobbin pitch in intermittent operation, with at least one standby position for bobbin holders with full bobbins in the circulating path, with a take-off position for bobbin holders in the circulating path opposite a thread guide in the entrance area of a thread consumer and with a loading section in the circulating path, in the area of which full bobbins can be placed on the bobbin holders and fixed.

On thread-processing textile machines, particularly where significant amounts of thread are processed per unit of time, it is usual to simultaneously present two or more cross-wound bobbins, whose axes are roughly aligned with the central thread guide, to a central thread guide at the entrance to a thread consumer. The thread is drawn off from one cross-wound bobbin at a time via the central thread guide. The end of the active bobbin or the bobbin with the highest priority is regularly connected to the beginning of the following bobbin.

In this way, the coils can be processed one after the other without interrupting the work process.
The empty spools are replaced by full spools and the thread ends are connected to each other in the manner described.

An example of this method of operation is described in EP 0 982 422 A1 for use on weaving machines for double-weave carpet fabrics. Here, different weft threads are fed parallel to one another to the grippers of a carpet weaving machine.

On double carpet weaving machines or heavy weaving machines, where very large quantities and very thick weft threads are processed per unit of time, the bobbins to be fed in must be processed very quickly and replaced with new ones.

The disadvantage of this design is that the time available in which the bobbins must be changed is limited. The bobbins are changed close to the unwinding area of the thread that has just been drawn off. This often leads to collisions between the strongly jumping unwinding thread and the bobbin that is being put on.

Another very significant disadvantage is that the deflection of the thread at the central thread guide is regularly greater than 45° due to the size of the cross-wound bobbins and the paired arrangement of the groups of four cross-wound bobbins. This leads to a heavy load on the thread at the central thread guide and to a load on the thread take-off and delivery device, which is effective before the thread is transferred to the respective gripper head.

As the weft insertion frequency increases and the resulting increase in thread speed, the frictional forces on the thread guide and the thread become very high. The result is an increasing frequency of thread breakage.

EP O 999 299 A3 has disclosed another device for the above-mentioned purposes. Here, the weft thread supply spools are placed on a ring-shaped carrier on radially aligned spool mandrels. Through a step-by-step movement, one of these spools regularly reaches the take-off position. The respective thread start is searched for there, captured and fed to a knotter, which connects the thread start of the new spool with the thread end that leads to the working elements of the textile machine.

If a thread is to be replaced by another for textile technology reasons, the thread is cut in the area of the knotting device. The beginning of the thread of a subsequent spool, which has come from a standby position and is now brought into a pull-off position, is caught and guided back into the area of the knotter. There it is connected to the thread end that is held ready. Once the knot has been made, the process can be continued.

Such a device is unsuitable for feeding weft threads, particularly on double carpet weaving machines, for several reasons. Firstly, on carpet weaving machines, two identical or different weft threads usually have to be fed parallel to each other, which are then inserted parallel to each other. These weft threads can have different thread consumption. Two independently controllable spool magazines must therefore be provided, each of which must be completed with a pair of scissors and a knotter.
The construction effort and space requirements are very high.

Every time the bobbin is changed, the weaving machine must be stopped and restarted after the knotting process has been completed. This not only causes production downtime but also a reduction in quality.

This is detrimental to the fabric being produced, as every stop of the machine results in variations in the tension of individual threads in the fabric.

The object of the present invention is to propose a bobbin magazine, in particular for the provision of weft threads on rapier weaving machines, which enables uninterrupted removal of weft threads in a small footprint and which enables the loading with new bobbins at a sufficient spatial distance from the bobbin just unwinding and at longer time intervals.

This bobbin magazine should be designed in such a way that two or more bobbin magazines can be positioned in front of two closely adjacent central thread guides for the simultaneous feeding of two or more weft threads, possibly of different thicknesses.

This object is achieved by the features of claim 1 with reasonable effort.

By guiding the bobbin holders in a row on an endless track, the shape of which can be designed as desired, the necessary functional areas, especially in the take-off section and the loading section, can be designed optimally for the respective conditions. In the take-off section, the bobbin in the standby position and the bobbin in the take-off position can be positioned along the track in such a way that the axes of these bobbins can be directed towards a common central thread guide. The bobbin can thus be changed in the take-off position without downtime.

On the other hand, the loading section can be designed in such a way that a large number of bobbin holders can be loaded simultaneously in this area.

It is possible to set the respective times of bobbin changes independently of the working rhythm of the machine in relatively large and irregular periods.

To ensure continuous operation of the weaving machine without constant monitoring and supervision, there is no need to use extremely large and unwieldy spools (10 kg or more).

Another very important advantage is that the deflection of the thread at the central thread guide can be set to an optimal value during the majority of the take-off process, which only deviates from the optimal value briefly and slightly when the bobbins are changed in front of the central thread guide. This point in time can be detected by sensors and limited to a minimum.

The embodiment according to claim 2 is useful if the number of spools on the machine at the same time is to be kept to a minimum. The upper limit of the number of spools is only determined by the ergonomic design of the operating area.

The connection of the spool holders with a separately guided, endless traction device with limited length of links or even in the form of a toothed belt - according to claim 3 - is useful if you want to present spools of a significant size. The force applied by the traction device is easier to control, especially on tight bends.

The design according to claim 4 will be chosen if larger coils are to be presented and the guideway is provided with larger curves.

The design according to claims 5 and 6 leads to a space-saving and stable construction.

By using sensors to monitor the take-off change according to claim 7, the operation of the bobbin magazine can be automated outside of the loading process. The run-off times for the thread from the standby position can be reduced to a minimum.

The monitoring device according to claim 8 offers reliable function even under difficult industrial conditions.

Equipping a double carpet weaving machine with two bobbin magazines according to the invention in the manner described results in long periods between two loading processes with minimal space requirements (claim 9).

The invention will be explained in more detail below using exemplary embodiments. The accompanying drawings show:

Fig. 1 is a simplified overall view of a weft magazine seen from the side in its arrangement with the central thread guide of a thread take-off and delivery device of a weaving machine,

Fig. 2 a corresponding view from the left,

Fig. 3 " another embodiment of the weft magazine

analogous to Fig. 1, but with a significantly smaller number of spool holders and the integration _of the spool holders into the traction device,

Fig. 4 a plan view of two bobbin magazines in front of the entrance area of the weft thread feed of a double carpet

pitch weaving machine,

Fig. 5 a detailed view of the most important functional sections

a spool magazine according to the invention with separate traction means for the spool holders,

Fig. 6 a view of the pair of bobbins in the take-off section with electromechanical monitoring of the connecting thread between the bobbins and

Fig. 7 shows an example of an electromechanical monitoring device.

The thread take-off and delivery device 1, represented by a block, is used to feed the weft thread on a rapier weaving machine. This thread take-off and delivery device 1 is generally known. It has means which forcibly draw the thread from the spool 35', temporarily store it and finally feed it under defined, optimal conditions to the weft thread insertion element, in this case the rapier of a weaving machine.

The entrance to the thread consumer 1 for the drawn-off thread is formed by a central thread guide 11. From this central thread guide 11, the thread moves essentially horizontally directly into the weft insertion plane.

The spool magazine 2 consists of a frame 4 and has support plates for the guide track 41. The guide track 41 is shown in detail in Fig. 5. It has a circumferential groove that determines the guide track 41. The spool holders 3 consist of a base plate 31 to which guide axes 32 are attached. The latter engage in the guide tracks 41, if necessary with the help of easily rotating wheels or rollers, and thus ensure that the spool holders 3 are guided without jamming.

The mandrel 30 stands vertically outward on the base plate 31 of the spool holder 3. The mandrel can have means for fixing the spool sleeve 351 in a manner known per se.

The spool holders 3 are guided at a predetermined distance, the spool pitch t, in an endless chain in the guide track 41. The means required for this are described later with reference to Figs. 3 and 5.

The guide track 41 is divided into four fundamentally different functional sections. In the so-called take-off section 411, there are two spool holders 3 in the respective rest phases, the spools 35, 35' of which are aligned with their axis to the thread guide 11. One of the spools, the full spool 35, is in the ready position B. The other spool 35', from which the thread is just being pulled off, is in the so-called take-off position A. The beginning of the thread of the spool 35 is connected to the end of the thread of the spool 35', which is in the take-off position A. We refer to the section of the thread created in this way as the connecting section 36.

During the rest phase, both spools 35, 35' are in a position in which the thread can be drawn off via the same thread guide 11. If a sensor, e.g. a light barrier 71, detects that the thread is drawn off the spool 35 in the ready position B at a certain point in time, then the row of spool holders 3 in the guide 41 is moved by a motor control so that the spool 35 moves by one spool pitch t from the ready position B to the draw-off position A. A new full spool 35 is thereby brought into the ready position B.

The return section is attached to the trigger section 411

414. It serves to throw off the empty bobbin tubes 351 and to align the empty mandrels 30 of the bobbin holders 3 in an opposite direction. Aligned in this way, the mandrels 30 of the bobbin holders 3 reach the loading section 412. This turning process ensures that when new bobbins 35 are placed in the loading section 412, the withdrawal of thread from the withdrawal position A is not hindered.

In the feeding section 412, which is predominantly vertical, feeding with full bobbins 35 is possible under optimal conditions. Under certain circumstances, robots can be used for feeding with bobbins. Feeding with full bobbins 35 can only be carried out when all mandrels in this section are free. This state can be easily detected with the help of sensors - e.g. in the form of light barriers 72. An activated sensor 72 can then either inform the operator or, in a borderline case, stop the weaving machine.

We refer to the area above the discharge section 411 up to the end of the feeding section 412 as the so-called storage section 413. The transition from the feeding section 412 to the storage section 413 is not necessarily tied to a specific shape of the path 41.

The so-called storage section 413 can also consist of a single coil 35, which is located above the withdrawal section 411. In extreme cases, the storage section 413 can be dispensed with entirely if all mandrels 30 up to the withdrawal section 411 are accessible for loading.

In this case, however, it is recommended to monitor at least the standby position by means of light barriers 71, 72 or 72' or other sensors (e.g. 73, 74.

Fig. 3 shows a reduced version of the weft magazine 2'. This illustration shows that the size of the weft magazine can be varied as desired depending on the respective technological conditions. Here, the storage section 413 has been completely omitted.

The spool holders 3 together with chain links 34' form an endless traction means 5. The traction means 5 is guided with the guide axes 32 and the axes at the joints of the chain links 34 in the guide tracks 41' and is driven by one of the deflection wheels 42' or 43' in the sense described above.

To drive these deflection wheels 42" or 43", it is advisable to use a controllable motor 6, to which a worm gear 61 is assigned (see Fig. 1 and 2).

Fig. 4 shows a highly simplified top view of two bobbin magazines 2, 2a arranged next to each other at an angle α. This arrangement is particularly suitable for double carpet weaving machines where identical or different weft threads must be presented parallel to each other. Both bobbin magazines 2, 2a can be controlled independently of each other.

If, for example, two or more different weft threads are presented in each weft insertion level &zgr;, additional bobbin magazines 2, 2a can be arranged staggered in depth if necessary.

The different weft threads are fed into the consumer 1 - as far as the working elements available there allow - close to each other in

guided in different ways. They can be optionally presented to the respective grippers at the exit.

The completely arbitrary thread consumption does not affect the operation of the bobbin magazines 2, 2a in any way.

In Fig. 5, the lower section of a guide track 41 is shown in somewhat more detail.

We first see that the spool holder 3 consists of a base plate 31 to which two guide axes 32 are attached, which are guided in two opposing guide tracks 41. Two spool holders 3 are connected to one another via one or more chain joints 34. In the area of the front guide axis 32 of this group, a coupling 33 engages, which is firmly connected to a traction device - here a toothed belt 51. The toothed belt 51 is guided and driven via the lower deflection wheel 43. An additional guide means is assigned to the toothed belt 51 by the curved guide 44 in the concavely curved take-off section 411.

In the upper area of the bobbin magazine 2, the toothed belt 51 is guided and tensioned by the upper deflection wheel 42 with a smaller diameter (see Fig. 1). The full bobbins 35 are placed on an empty mandrel 30 in the loading section 412 on the right-hand side of the illustration and, if necessary, mechanically fixed. The end of the thread that makes up the winding of the bobbin 35 protrudes at the lower end of the cross-wound bobbin. The beginning of the wound thread of a full bobbin 35 is connected to the thread end of the previous bobbin, e.g. 35', by means of a knot. This creates the connecting thread 36. By twisting the bobbin 35 on the mandrel 30, the connecting thread 36 between two bobbins 35 can be brought into a defined, tensioned position.

This connecting thread 36 is also inserted into a monitoring clamp 73. The monitoring clamp 73 is pivotably attached to the base plate 31 of each spool holder 3 (see Fig. 6 and Fig. 7). The monitoring clamp 73 is equipped with a clamping spring 731 and a locking bracket 732. The latter has two notches in different angular positions into which a spring catch 734 mounted on the spool holder 31 can elastically engage. The monitoring clamp 73 is provided with a flag 733. When the spool holder 3 is in the ready position B, the flag is arranged opposite a sensor 74. If the connecting thread 36 is pulled taut during a take-off change to the spool 35 in the ready position B, the monitoring clamp 73 initially moves to a second locking position. The flag 733 is thereby moved out of the area of the sensor 74. The resulting pulse is fed to the motor control and triggers the switching of the coil holders 3 by one coil pitch t.

The withdrawal from the next spool 35' can again be carried out under optimal conditions when the spool axis has been pivoted by the angle β.

In this take-off position A, the thread, which is slightly deflected at the central thread guide 11, is permanently guided and is braked slightly and evenly, so that harmful vibrations can be largely kept away from the thread take-off and delivery device 1. A new, full bobbin 35 returns from the storage section 413 to the ready position B of the take-off section 411.

If the bobbin 35' is empty again in the take-off position A, then the thread connection 36 described above causes further take-off from the bobbin 35, which is still in the standby position B, without interruption. This process is repeated as often as desired.

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In the embodiment according to Fig. 3, the light barrier 71 fulfills the function of the monitoring terminal 73 with the sensor 74.
The fact that the thread withdrawal has passed to the spool 35 located in the standby position B is determined by the sensor, e.g. a light barrier 71, which can detect the thread running off the spool 35. The signal obtained in this way causes the motor 6 to move the spool holder 3 by one spool pitch t according to a predetermined program.

The spool 35 from the ready position B moves to the trigger position A and can be processed under the same conditions as the spool 35' previously.

The empty bobbin tubes 351 are ejected or removed in the lower region of the return section 414, so that free mandrels 30 are regularly available on the right-hand side in the loading section 412.

This process of thread removal and bobbin change in the take-off position can continue until the last full bobbin 35 is located directly above the take-off section 411 or even in the standby position B. Then, at the latest, a loading process must take place.

In the event that the process is not continuously monitored manually, this situation can be signaled to the operator via a sensor - light barrier 72 - and, if necessary, the machine and the bobbin magazine 2 can be stopped during the next switching process.

As a rule, the loading of new coils 35 is carried out exclusively in the area of the vertical part of the loading section 412.

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taken, while the full coils 35 in the storage section 413 represent a certain safety cushion.

The use of such bobbin magazines 2 is not limited to use on predominantly heavy rapier weaving machines. One can also imagine an application on knitting machines or other textile machines on which individual threads are processed in large quantities per unit of time.

·» *W H i* SS i
•'CSS' * · t » t , t» se, S01111-DEU List of reference symbols «V ♦ '»*«« V * t * · * · · 7 August 2001 Thread take-off and delivery device/consumer • i »·* ' it ·♦»&idiagr; · ·■♦ Thread guide, central ■'■*'-' 15 Spool magazine Spool holder mandrel Base plate 1 Guide axes 11, 11a coupling 2, 2', 2a Chain joint 3 Coil, full 30 Coil sleeve 31 Connecting thread 32 frame 33 Guideway 34 Deduction section 35, 35', 35a, 35a ¹ Feeding section 351 Storage section 36 Return section 4, 4a Deflection wheel, top 41, 41' Deflection wheel, bottom 411 Bow guidance 412, 412' Traction device 413 Timing belt 414, 414' Drive motor 42 Worm gear 43 Light barrier, sensor 44 Light barrier, sensor _s 5 Monitoring terminal 51 Clamping spring 6 Locking bracket 61 banner 71 Spring catch 72, 72' sensor 73 Trigger position 731 Standby position 732 Coil pitch 733 angle 734 angle 74 A B t &agr; ß

Claims (9)

1. Bobbin magazine for weft supply bobbins on rapier weaving machines
with coil holders ( 3 ) which are movable along an orbit at a distance of a coil pitch (t) in intermittent operation,
with at least one standby position (B) for spool holders ( 3 ) with full spool ( 35 ) in the orbit,
with a take-off position (A) for bobbin holders ( 3 ) in the orbit opposite a thread guide ( 11 ) in the entrance area of a thread consumer ( 1 ) and
with a loading section ( 412 ) in the orbit, in the area of which full bobbins ( 35 ) can be placed and fixed on the bobbin holders ( 3 ),
characterized ,
that the spool magazine ( 2 ) consists of a plurality of spool holders which are guided and driven in an endless row in differently designed guide tracks ( 41 ) at a distance of one spool pitch (t) each,
that the guide tracks ( 41 ) are subdivided into differently designed sections, namely at least one withdrawal section ( 411 ), a return section ( 414 ) and a feeding section ( 412 ),
that the take-off section ( 411 ) is designed in an arc around the thread guide ( 11 ) and comprises at least two bobbin locking positions, namely the standby position (B) and the take-off position (A), at a distance of one bobbin pitch (t) and the axes of the bobbins ( 35 , 35 ') in the standby position (B) and in the take-off position (A) are aligned with the thread guide ( 11 ),
that the return section ( 414 ) is arranged between the withdrawal position (A) and the loading section ( 412 ) and is curved for the vertical change of direction of the guide track ( 41 ),
that the feeding section ( 412 ) extends predominantly in a nearly vertical plane, close behind the discharge section ( 411 ) and
that the thread beginning of the spool ( 35 ) in the ready position (B) is connected to the thread end of the spool ( 35 ') in the take-off position (A), forming a connecting thread ( 36 ). 2. Bobbin magazine according to claim 1, characterized in that the bobbin magazine ( 2 ) comprises at least six bobbin holders ( 3 ) in a row per revolution. 3. Coil magazine according to claim 1, characterized in
that the coil holders ( 3 ) are connected to an endless traction means ( 51 ) via couplings ( 33 ) and
that the traction means ( 51 ) are guided and driven via deflection wheels ( 42 , 43 ). 4. Coil magazine according to claim 1, characterized in
that the spool holders ( 3 ) are connected to one another by means of chain joints ( 34 ') to form an endless traction means ( 5 ) and
that the traction means ( 5 ) is guided via deflection wheels ( 42 , 43 ) and is driven in intermittent operation. 5. Coil magazine according to claim 3 or 4, characterized in
that the traction means ( 5 ; 51 ) is guided over two deflection wheels ( 42 , 43 ; 42 ', 43 ') arranged vertically one above the other with a horizontal axis and
that additional guide means (curved guide 44 ) are assigned to the traction means ( 5 ; 51 ) in the region of the withdrawal section ( 411 ). 6. Coil magazine according to claim 1 and 5, characterized in
that the lower deflection wheel ( 43 , 43 ') has a larger diameter than the upper deflection wheel ( 42 , 42 ') and
that a controllable motor ( 6 ) with a worm gear ( 61 ) is assigned to the lower deflection wheel ( 43 , 43 '). 7. Coil magazine according to claim 1, characterized in
that sensors ( 71 ; 73 , 74 ) are provided for monitoring the trigger change between the trigger position (A) and the ready position (B) and
that the sensors ( 71 ; 73 , 74 ) are connected to the drive control for the step-by-step movement of the row of bobbin holders ( 3 ). 8. Coil magazine according to claim 1 and 7, characterized in
that between two adjacent spool holders ( 3 ) a movable monitoring clamp ( 73 ) for the connecting thread ( 36 ) of the two spools ( 35 , 35 ') is arranged and
that a sensor ( 74 ) is assigned to the movable monitoring terminal ( 73 ). 9. Double carpet weaving machine with at least two weft insertion levels with at least one bobbin magazine according to claim 1, characterized in that
that at least two coil magazines ( 2 , 2 a) are arranged adjacent to each other at an acute angle (α) and
that the thread guides ( 11 , 11a ) of these bobbin magazines ( 2 , 2a ) are located near the apex of this angle (α).