EP3347513A1

EP3347513A1 - Weaving machine with a device and method for holding, feeding and introducing weft threads into a shed

Info

Publication number: EP3347513A1
Application number: EP16758151.1A
Authority: EP
Inventors: Markus Gielen
Original assignee: Lindauer Dornier GmbH
Current assignee: Lindauer Dornier GmbH
Priority date: 2015-09-10
Filing date: 2016-08-29
Publication date: 2018-07-18
Anticipated expiration: 2036-08-29
Also published as: JP2018530681A; CA2996462A1; AU2016318569A1; KR20180048693A; DE102015217356B3; RU2018112569A; JP6682622B2; US10472745B2; TW201723254A; CN108350626A; CN108350626B; EP3347513B1; US20180291538A1; WO2017042039A1

Abstract

Device and method for holding and feeding weft threads (1, 2) to the gripper (6) of a weaving machine with drives (25, 29) by way of which clamps (11, 12) for the weft threads (1, 2) are moved on movement paths (35, 36) respectively into a feeding position (16, 19), a transfer position (17, 20) and a standby position (18, 21). The movement path (35, 36) of each clamp has a self-contained form. In this case, the start of movement of at least one of the clamps (11, 12) from its standby position (18, 21) into its feeding position (16, 19) takes place in a period which lasts from the start of the beating movement of the reed (9) until the previously introduced weft thread (1, 2) hits the beat-up line (10) of the weaving machine.

Description

Weaving machine with a device and method for holding, feeding and entering weft threads in a shed

Technical area

The present invention relates to a loom with a device for holding, feeding and entering weft threads in a shed the

Loom. Furthermore, a corresponding method is presented. State of the art

In weaving machines devices and methods are known in the prior art in which different weft threads alternately from a

Entry side of the loom from be entered by means of a gripper in the shed formed by warp loom of the loom.

In order to keep weft threads, which are not involved in the weft insertion in the respective weaving cycle, on the input side of the weaving machine in readiness, auxiliary edge threads - so-called catch strips - or separate thread clamps for the weft threads are used in the prior art. The use of separate thread clamps instead of catch strips has the advantage that less thread waste is generated, since on the entry side of the fabric no auxiliary edge threads are present, which would have to be removed before further use of the fabric.

It is also known, with the help of drives, the above-mentioned thread clamps with the respectively clamped weft yarn before the weft insertion to bring the gripper, so that the supplied thread end detected by the gripper and then can be entered into the shed. By using such Zubringender thread clamps further reduction of the thread waste occurs because the yarn ends of the weft threads, which remain on the finished fabric on both sides beyond the fabric edge addition, are shorter than in arrangements without zubringende thread clamps.

Such a method is shown for example in EP 902109 A1. This device works with piezo clamps, with the help of which weft threads are alternately positioned vertically and transferred to the gripper with a pivot drive. Also EP 1367159 A2, EP 644286 A, DE 1937134 and DE 3524727 A1 show devices and methods for holding and feeding weft threads to the looper of a loom. Finally, EP 0 240075 A2 describes a system of attaching clamps arranged side by side on the feed side of the loom. Each of these zubringenden terminals is brought by means of its own drive in each case in three different positions A, B, C. These are each a standby position (A), a feed position (B) and a takeover position (C).

Modern weaving machines can be operated at web speeds of more than 600 picks per minute. At these speeds, there is very little time available for the movements of the clamps described above. In EP 0240075 A2, the operation of the

corresponding device discloses a method in which for the movement of the applied terminals from the standby position to the delivery position only the time is available between the attack of the last struck at the binding point of the loom weft thread and the beginning of the movement of the gripper for the following weft insertion is present.

The weaving cycle of a weaving machine is usually divided into 360 degrees. This corresponds to a revolution of a main drive shaft of the loom. If one puts usual movements of a rapier loom and a

Speed of 600 weft insertion per minute, the time between the stop of the last inserted weft thread on the

Binding point (= 0 degrees machine angle) and the capture of a new weft thread by the gripper (at about 60 - 70 degrees machine angle) only about 0.01 sec. It has been found that this time is insufficient to with today's available Drives to bring a mass thread clamp with the weft end clamped in it from a standby position to a feed position.

Another problem is that with an independent drive of the zuutzenden terminals on the entry side of the loom an illegal Crossing two successive weft threads in the weaving cycle can not be excluded. Such a crossing can occur when a weft thread to be newly inserted, which is moved by means of its delivering clamp to the delivery position, on its way crosses the path of the immediately previously inserted weft thread, which after the

Weft insertion from the reed towards the binding point of the fabric is transported.

The object of the present invention is to provide a weaving machine with an apparatus and a method with which more time is available for the movement of the clamps to be supplied from the standby position into the feed position and in which a crossing of weft threads on the feed side is avoided becomes.

Description of the invention

This object is achieved by a weaving machine with an apparatus and a method according to the independent claims.

The weaving machine is equipped with a device for holding and feeding weft threads to the looper of the loom. Furthermore, with a first and a second terminal, and with a first and a second drive, which are each associated with a terminal, so that the two terminals independently of each other on trajectories in a respective Zubringeposition, a

Transfer position and a ready position are movable.

These three positions are arranged on an entry side of the loom outside of a shed or next to the fabric edge of the loom. The respective feed position of the clamps is located in an area between the track of the gripper and the outwardly extended stop line of the reed. The stop line here is the foremost position of the reed in the warp direction of the weaving machine when striking the weft thread to the binding point of a fabric.

The feeder position is now chosen so that the respective weft thread in this position of the terminal between the weft supply or more

Guide means on the loom and the associated terminal is so, that it can be detected by the gripper during the entry movement of the gripper into the shed. Depending on the position of the stop line and also in dependence on the design of the gripper while the Zubringeposition in the weaving machine can also be higher or lower than the career of the gripper or the stop line. The closer the respective feed position of a clamp is to the gripper, the shorter the weft thread ends which are taken along by the gripper when this weft thread is introduced onto the other fabric side.

The takeover position of the attaching terminals serves to allow the weft thread inserted into the shed by the gripper to be taken over again by the respectively associated clamp after transport of the weft thread in the direction of the stop line of the weaving machine or the binding point of the weave. Then the clamp with the weft thread can be returned to the ready position.

The respective takeover positions of the clamps are in the region of the outwardly extended stop line of the weaving machine. They are arranged so close to the stop line or the fabric edge that the acquisition of the moving from the reed in the direction of the stop line weft thread is supported by the respective terminal.

In the standby position, the clamped weft thread is kept ready by the terminal to be applied until it is again his turn, depending on the specifications of the weave pattern, to be registered in the shed. Before the weft insertion, the terminal to be delivered, with the weft thread clamped therein, is brought into the feeding position close to the gripper of the weaving machine.

The respective readiness position of the terminals is in an area above the respective transfer position and above the respective transfer position. It is assumed that the weaving plane is arranged in the usual way so that the shed is formed by a substantially vertical movement of the warp threads. The weaving machine according to the invention is characterized in that the

Drives of the terminals are designed and arranged on the loom that

the trajectory of each clamp has a self-contained shape; - Each terminal is movable by means of the associated drive in three along the respective trajectory successively arranged predefined positions; these predefined positions are the feeder position, the transfer position and the ready position;

the respective clamp is movable from the last of these three positions - the ready shaft position - to the first of the three positions - the shuttle positions - without entering the intermediate second position - the transfer position.

These features make it possible to control the terminals so that an unacceptable crossing of the two weft threads on the entry side is avoided when changing the entry of the two weft threads.

The described arrangement of the trajectories also creates the

Prerequisites for at least one of the two clamps with the clamped end of the weft yarn to be inserted next to start the movement from the respective readiness position of this clamp in the direction of its respective feed position very early in the weaving cycle.

This results from the fact that due to the closed shape of the movement path, a movement of a terminal from its standby position in their

Zubringeposition is possible without this terminal while in their

Transfer position arrives. By similar construction of the drives and the

Clamps and by appropriate arrangement on the weaving machine can then be achieved that a terminal does not come in the movement from its standby position to its feed position in the vicinity of the transfer position of the other terminal.

One possible, structurally favorable embodiment results when the drives are designed such that the feeder position, the transfer position and the ready position of the first terminal are in a first movement plane, while the feeder position, the transfer position and the ready position the second clamp in a second, from the first plane of motion

different levels of movement.

In order to be able to optionally use more or fewer weft threads, it makes sense to construct the device for holding and feeding the weft threads modular. A favorable modular design results from the fact that the drive is arranged with the associated terminal each on a separate housing or a support plate. This ensures that similar modules of drive, housing and terminal can be arranged differently on the weaving machine depending on the number and requirements.

An advantageous arrangement also results when the movement planes in which the trajectories of the terminals extend, with respect to a

Warp direction of the loom are angled at an angle which lies in a horizontal plane of the loom.

This results in that the respective feeder positions of the terminals in

Shot direction seen from the center of the loom are farther away than the respective takeover positions. This will cause the weft in the

Feeding position of the gripper on its way into the shed already detected very early.

With the weft direction, a direction parallel to the course of the weft threads in the shed is defined on the weaving machine.

In a further embodiment, the modules of drive, housing and clamp are arranged on the weaving machine such that the planes of movement of the clamps are angled relative to one another at an angle which lies in a vertical plane extending in the weft direction of the weaving machine.

By this fan-shaped arrangement of the modules can be achieved that the feed positions of the terminals are very close to each other or even at the same position in the loom.

This is advantageous for a small and equal length weft waste both the first and the second weft. This is even more true if more than two different weft threads and more than two clamps with the corresponding drives are used on the weaving machine. However, it is also possible in principle to provide more or less large distances between the different feeding positions of the clamps.

Due to the described fan-shaped arrangement of the modules, the takeover positions of the clamps with respect to the loom can all be brought to the same geometric position. This is particularly advantageous because the same geometric conditions are present with each acquisition of a previously entered weft thread.

Due to the fan-shaped arrangement in the manner described arises between the standby positions of the various terminals seen in the weft direction a distance from each other.

In order to optimally use the available space for the device on the loom, it is also useful to arrange the housing with the drives for the terminals mirror images of each other.

In an advantageous embodiment of the weaving machine according to the invention adjusting means are provided with which the start of movement of the clamps with the clamped end of the next to be introduced weft thread from the respective standby position in the feed position in the weaving cycle

Loom is adjustable.

This setting means may be, for example, a programmable controller for the drives of the terminals, the setting or programming via an input menu on the control panel of the loom. Furthermore, the weaving machine to those skilled in principle known means for cutting the registered weft thread.

For this purpose, a weft scissors in the region between the entry-side fabric edge and the transfer position of the terminals is usually

arranged.

The existing terminals and their drives are preferably constructed identically, so that they can be arranged modularly on the loom. Such a module for holding and feeding a weft thread to the gripper of a loom comprises a housing or a carrier plate, as well as a Clamp for the weft. Furthermore, a drive is provided, with which the clamp along a trajectory in different positions is movable. The module is characterized in that the drive includes a linkage, which is designed such that the path of movement of the clamp has a self-contained form. This shape is, for example, circular or elliptical.

Due to the closed shape of the trajectory, it is possible to bring the clamp into three positions arranged along the trajectory one behind the other and the clamp from the last of these three positions to the first of the three

To bring positions without getting into the intermediate second position.

Compared with the prior art, this feature provides an advantage because a clamp can move along its trajectory from the standby position to the feed position along a portion of the trajectory that does not contain the takeover position. With a corresponding arrangement of several such modules on the weaving machine, therefore, each of the clamps moves on its way from the standby position to the feeding position on one

Movement path that is not near the transfer position of another

Clamp runs.

Thus, the danger of crossovers between two in the change

registered weft threads lower. This leads to the fact that the beginning of movement of a terminal from its standby position can already take place in the Zubringeposition before the previously entered weft thread to the stop line of the

Weaving machine is struck.

An embodiment of the module according to the invention comprises a drive with a motor and a linkage with a crank, which is driven by the motor. Furthermore, a push rod is provided, which is connected to the crank and which is displaceably mounted in a sliding joint. The sliding joint is mounted with respect to the housing of the module in a pivot point. Finally, there is a clip for the weft, the clip being most suitably attached to the tip of the push rod. In principle, other types of drives or gears are possible with which the described closed shape of the trajectory of a moving terminal can be achieved. It is conceivable, for example, to move the housing and the push rod with independently operating linear motors.

In the present example, the trajectory of a clamp runs in one plane. Technically possible, however, are gears or drives with which spatially curved trajectories are realized.

The motor of the joint gear can be, for example, a stepper motor whose movement start and movement speed via appropriate

Control units is freely programmable or adjustable. Moving the clamp one by one to the predefined positions along its associated

Trajectory is carried out in the present embodiment with the same direction of rotation of the motor.

If, however, the same weft thread is entered twice in succession in two consecutive weaving cycles, the direction of rotation of the motor can also be reversed so that, for example, a clamp is moved directly from the takeover position back into the feed position. The clamps are most conveniently located at the tip of a needle-like push rod, part of that already described above

Forming joint.

The clamps can be designed, for example, as spring clip terminals, in which the respective weft thread is clamped or pulled out with the spring-loaded clamp closed. However, the use of actively controllable terminals is particularly advantageous. For example, suitable are piezo terminals which are electrically controlled (for example as in EP 902109 A1) or pneumatically or electromagnetically controlled terminals or combinations of these active principles.

In a further embodiment, the module described within the push rod on a pneumatic cylinder with a pneumatic piston. In addition, a piston rod is provided, which is connected to the pneumatic piston. The clamp of the module is connected to the piston rod in such a way that Actuation of the pneumatic cylinder, the terminal can be opened or closed.

There is still a method for holding, feeding and registering

Weft threads proposed in a shed of a loom.

This method is particularly suitable for the operation of the loom according to the invention described here with its embodiments

For carrying out the method according to the invention are at least two

Weft threads and at least one gripper for entry of the weft threads in the shed formed by the warp shades present. The entry of the weft threads takes place from an entry side of the weaving machine. The weft threads are preferably entered alternately in different successive weaving cycles. There are at least a first and a second clamp for holding and feeding the weft threads to the gripper available.

Of course, the method is also applicable to applications with more than two weft threads, which are then held by a correspondingly larger number of terminals and spent the drool.

With the help of a first and second drive, each of which is assigned to a terminal, the terminals are independently connected to each other

Trajectories moved in three different positions, namely in each case a feeder position, a takeover position and a

Standby position. Furthermore, on a weaving machine for carrying out the method, means known to the person skilled in the art for cutting the inserted weft thread are present. For this purpose, a weft scissors is usually arranged in the region between the entry-side fabric edge and the transfer position of the terminals.

As usual, a weaving cycle of the weaving machine takes place over 360 degrees rotation angle of a drive shaft of the weaving machine. Successive web cycles contain the following method steps in carrying out the method according to the invention: Moving the first clamp with an end of a first weft thread clamped therein from a ready position of the first clamp to a delivery position of the first clamp;

Detecting the first weft thread by the gripper;

- Entering the first weft thread in the shed;

Moving the first clamp to a takeover position of the first clamp; Striking the first weft thread to a stop line of

Loom by means of a stop movement of a reed;

Taking the first weft through the first clamp;

- Cutting the first weft, leaving a new first

Weft end arises;

Moving the first clamp with the new end of a first weft thread clamped therein from the takeover position of the first clamp into the first clamp

Standby position of the first terminal;

Moving the second clamp with an end clamped in it

second weft thread from a standby position of the second clamp to a feed position of the second clamp;

Detecting the second weft thread by the gripper;

Inserting the second weft thread into the shed;

- Moving the second terminal in a takeover position of the second

terminal;

Striking the second weft thread to the stop line of

Loom by means of a stop movement of the reed;

Taking the second weft through the second clamp;

- Cutting the second weft thread so a new second

Weft end arises;

Moving the second clamp with the new end of the second weft thread clamped therein from the takeover position of the second clamp to the ready position of the second clamp.

According to the invention, the drives of the terminals are designed in such a manner and arranged on the loom that the

Trajectory of each terminal has a self-contained shape and that each terminal by means of the associated drive in three along the respective Trajectory successively arranged positions is moved, namely the feeder position, the transfer position and the ready position.

In carrying out the method, furthermore, each of the clamps is moved on its trajectory from the respective standby position to the feeder positions, without thereby reaching the intermediate takeover position. According to the invention, the start of movement of the movement of at least one of the two clamps is from its standby position into its feed position in FIG

Web cycle of the weaving machine in a period of time from the beginning of

Stop movement of the reed extends to the stop of the previously entered weft thread to the stop line of the loom.

The timing described is made possible by the independent drives of the terminals. These are controlled in such a way that the clamp with the weft thread to be entered next does not wait with its movement towards the gripper until the striking, taking over and cutting of the last weft thread entered has taken place. Rather, the movement of the clamp begins with the next to be entered weft earlier in the weaving cycle than was possible in the prior art. As a result of this earlier start of movement, the movement of the clamp from the ready position to the infeed position has a longer period in time

Web cycle available. This increases the maximum possible weaving speed (weft insertion per minute), which still ensures proper function of the clamps.

During operation of the weaving machine according to the invention, the weft threads kept ready usually extend starting from the standby positions of the clamps in the direction of the outside of the weaving machine

Weft reserve. The course of the threads takes place on straights that the

Cross entry side track of the gripper above the gripper. In this case, the weft yarns kept ready in the direction of the weft supply usually run through a series of yarn guides or yarn loops, which are also arranged offset behind the gripper in the weft direction side by side. Said thread guides or eyelets may be part of a device known in the art weaving machines whose function is usually to select depending on the weave pattern currently weft to be inserted and to move this weft in the trajectory of the gripper that this Capture weft thread and enter into the shed. This is usually done by a substantially vertical movement of said eyelets from a position above and - in

Seen in the warp direction - behind the entry-side trajectory of the gripper in a lower position.

During the movement of the clamps for holding and feeding weft threads from the respective standby position to the respective feed position, starting from the current position of the respective clamp, different courses of the weft threads now result in the direction of the eyelets

Weft reserve. Depending on the sequence of movements of the alternately

To be entered weft threads in successive weaving cycles arise crossing points between the thread progressions of different weft threads starting from the current position in the movement of the respective terminal in the direction of the eyelets or thread guides in the direction of the

Weft stock of the loom.

When carrying out the method according to the invention, in principle two different motions A) and B) predetermined by the weave pattern can be distinguished.

In both cases A) and B), the so-called first clamp in the context of the invention is that clamp which is arranged closer to the center of the weaving machine or also closer to the entry-side fabric edge than the second clamp. The ready positions of the terminals are thus arranged offset to one another in the weft direction. This also applies mutatis mutandis when using more than two weft threads with more than two terminals.

Case A)

The weft thread to be introduced in the next weaving cycle is a so-called first weft thread in the context of the invention. That is the one weft thread that from a designated here as the first terminal terminal of the respective

Standby position is brought into the respective Zubringeposition.

Case B)

The weft thread to be introduced in the next weaving cycle is a so-called second weft thread in the context of the invention. That is, a weft thread, which from a designated here as a second terminal terminal of the respective

Standby position is brought into the respective Zubringeposition. The movements of the clamps must now be controlled both in case A) and in case B) so that the above-described, kinematically and geometrically induced thread crossings can not lead to a disturbance in the weaving process.

As mentioned above, there is a weaving cycle of the loom over 360 degrees

Angle of rotation of a drive shaft of the loom.

The beginning of movement of each clamp from its standby position in the

Zubringeposition in the weaving cycle of the loom is now set or programmed so that a crossing of the clamped from the respective weft weft with the immediately previously registered other weft during transport of this weft thread through the reed to

Stop line of the loom is avoided.

For this purpose, it is useful in case A) that the beginning of movement of the first clamp from its standby position is set or programmed in its feed position in the weaving cycle of the loom so that the first weft thread crosses the path of movement of the immediately entered second weft thread, after this second weft yarn has been moved during transport through the reed in the direction of the binding point under the first weft thread clamped in the first clamp.

The geometric conditions on the weaving machine and the type of movement of the reed can be very different. These parameters determine the start of movement of the terminals. In a meaningful embodiment of the

The method according to the invention is carried out in case A), the start of movement of the first Clamp from its standby position to its weaving position in the weaving cycle in a range between 20 degrees to 0 degrees before the abutment of the immediately preceding first weft at the binding point of the fabric or at the stop line of the loom.

In case B), it is advantageous to design the method such that the movement of the second clamp begins earlier in the phase of the weaving cycle, during which the previously entered first weft thread is still moved by the reed towards the binding point. This is done by such a setting or programming that the second weft thread only crosses the path of movement of the first weft inserted immediately after this first weft yarn moves during transport through the reed in the direction of the binding point on the second weft clamped in the second terminal has been.

In an advantageous embodiment of the method according to the invention in case B), therefore, the start of movement of the second terminal takes place from her

Standby position in its Zubringeposition in the weaving cycle in a range of 60 to 20 degrees before the stop of the last registered first weft thread. Due to the different distances between standby position,

Feeding position and takeover position result in the implementation of the method under certain circumstances different thread lengths in the course of the weft thread from the respective terminal on the eyelets of the color selector to the weft supply.

By an opposite control of the eyelets or by additional actively driven deflection - for example, several pulleys - in the course of the weft thread, the described different thread lengths can be compensated in the course of the weft. A corresponding yarn retractor is described for example in DE 3524727 A1.

Depending on the type of weft thread, it may also be useful to take over the ailing weft thread through the associated terminal in the

Takeover position through additional measures. That can be one Be movement of the clamp in the vertical direction, through which an example hook-like open clamp can detect the transverse weft presented. But this can also be thread guide elements, which are arranged laterally on the reed and press in the stop movement, the laterally projecting thread end of the weft thread in the ready terminal. Such elements are disclosed for example in EP 0240075 A1.

Separately actively driven thread guides in the area of the stop line are also conceivable for such a function. In the following, a possible embodiment of the loom according to the invention will be described.

DESCRIPTION OF THE DRAWINGS FIG. 1 Schematic partial view of the entry side of a weaving machine with

Viewing direction in the warp direction from the front;

Figure 2 view of the loom according to Figure 1, but with a view from above, section A-A;

FIG. 3 shows a loom according to FIG. 1, but viewed in the weft direction, section B-B;

FIG. 4 Enlarged view of the weaving machine according to FIG. 2, but with different positions of the clamps and the gripper;

Figure 5 Schematic view of a module for holding and feeding of

Weft threads, representation of the trajectory with view in the weft direction, clamp in the ready position;

FIG. 6 Schematic view of the module according to FIG. 5,

Clamp in feeder position; Schematic view of the module according to Figure 5, terminal in takeover position;

Enlarged view according to Figure 2 showing the trajectories of the first and the second terminal;

View of the loom according to Figure 1, but viewed from above on the device for holding and feeding of

Wefts;

View of the loom according to the figure 2, but first terminal in take-over position, second clamp on the way to the feeder position;

View of the weaving machine according to FIG. 10, but viewed in the weft direction along section B - B in FIG. 1;

Detail view of the push rod with pneumatic cylinder and clamp.

Advantageous embodiments of the invention

Figures 1 - 3 show schematic partial views of the entry side of a loom.

Several weft threads - in the present example, two weft threads 1, 2 - are deducted from different supply spools 3. The weft threads 1, 2 are alternately brought into the line of movement of a gripper 6 by means of a device 4 for selecting weft threads - or weft colors - and a device 5 for holding and feeding weft threads and inserted by the latter into a shed 7. The shed 7 is formed in a known manner by warp threads 8. After the weft insertion of the registered weft thread 2 is brought from a reed 9 to the stop line 10 of the loom or to the binding point of the fabric 13. In this case, the weft thread 2 reaches into the region of a clamp 12, which receives it in a takeover position 20. Subsequently, the weft 2 between the clamp 12 and the fabric edge 14 cut by means of a cutting device 15. This creates two sections of the

Weft 2. The one section remains in the fabric 13 and is transported with this in the direction of a - not shown - puller. The clamp 12 is brought to the other section or the thread end of the weft thread 2 in a - not shown in Figures 1 -3 - ready position 21 above the transfer position 20. Once the relevant weft thread 2 is to be reentered in the shed 7, the yarn end of this weft yarn 2 is brought by means of the clamp 12 in a Zubringeposition 19 near the gripper 6. At the same time, the eyelet 22 of the device 4 for selecting

Weft threads (for example, a color picker) moved down. In this way, the weft thread 2 enters the path of the gripper 6 and can be detected by this. Figures 1-3 show the situation in which the thread end of a first

Weft 1 is held by a first terminal 1 1 above the weaving plane in a first ready position 18. The first clamp 1 1 is arranged at the tip of a first push rod 23 which is mounted in a first housing 24 and connected within the first housing 24 with a first drive 25, which will be explained later.

The first weft thread 1 runs on its way from the weft supply 3 - e.g. from a yarn package and possibly even by a Vorspulgerät - via the eyelet 22 of a color selector 4 to the first terminal 1 1. The second weft thread 2 is located in the representation according to the

Figures 1-3 in the shed 7, after he was entered immediately before by the gripper 6. It is shown how the reed 9 moves the registered second weft thread 2 in the direction of the stop line 10 of the loom. Outside of the shed 7, the second weft thread 2, starting from the weft supply 3 - similar to the first weft thread 1 - via a lowered eyelet 22 of the color selector 4 to the shed 7.

In the region of the extension of the stop line 10 is a second terminal 12 in its transfer position 20. The second terminal 12 is arranged at the tip of a second push rod 27 which is mounted in a second housing 28 and is connected within the second housing 28 to a second drive 29.

The two housings 24, 28 with the drives 25, 29 for the terminals 1 1, 12 are formed in principle similar and arranged in the present case mirror images and offset from each other.

Starting from the position in FIGS. 1-3, during the further course of the operation in the weaving cycle of the weaving machine, the second weft thread 2 is next transported to the stop line 10 of the weaving machine and thus to the weaving machine

Binding point of the fabric 13 struck. In this case, the second weft thread 2 dives under the first weft thread 1 held in the first clamp 11. The crossing of the two weft threads 1, 2 shown in FIG. 2 is suspended from this moment on. As a result, the way is clear for a now beginning movement of the first weft thread 1 with the first terminal 1 1 in the direction of the feeder position 16 of the first terminal 1 1 (see Figure 4). The troubled second weft thread 2 is introduced at the stop in the second terminal 12. In the present case, the terminal 12 is pneumatically opened for this purpose. How the control of the terminals 1 1, 12 is carried out, will be described below (Figure 12).

It is also possible to assist the insertion of the weft thread 2 into the clamp 12 in the take-over position 20 by an upward movement of the clamp 12. In this case, the weft thread 2 is detected by the terminal 12.

Also conceivable are additional thread guide elements which actively push the weft thread 2 into the clamp 12 in the transfer position 20. The same applies analogously to the course of the acquisition of the weft thread 1 through terminal 1 1.

After the second weft thread 2 has been detected by the second clamp 12, it is closed. Subsequently, the second weft thread 2 is cut between the second clamp 12 and the entry-side fabric edge 14 by a cutting device 15 designed as a weft scissors.

Thereafter, the second clamp 12 with the new end of the second

Weft 2 brought to the ready position 21 of the second terminal 12 (see Figure 4). The associated eyelet 22 of the color selector 4 is raised in this process.

Still during the recording of the second weft thread 2 by the second

Clamp 12, the first terminal 1 1 moves with the first weft thread 1 from its standby position 18 in the Zubringeposition 16. At the same time moves the associated eyelet 22 of the color selector 4 down. The gripper 6 begins its movement in the direction of the shed 7 and thereby detects the first weft thread. 1

At the moment in which the gripper 6 detects the first weft thread 1, the first terminal 1 1 is pneumatically opened. The control mechanism is similar in construction to the second clamp 12 and will be discussed below.

Now, the first weft thread 1 is entered into the shed 7. This situation is shown in FIG. The ready position 21 of the second terminal 12, however, is approximately in the middle between the stop line 10 and gripper 6 - but above the feeder position 19 and above the transfer position 20. The location of the various Predefined positions will be described below with reference to FIGS. 5-8. Figures 1 - 4 also show that the gripper 6 in the present

Embodiment outside of the shed 7 is guided by a mounted on the loom guide rail 30. The gripper 6 is at a

Gripper bar 32 attached, over which the gripper 6 is advanced into the shed 7 and withdrawn. Depending on whether the gripper 6 is driven by a gripper bar 32 or a gripper belt, other forms of

Grippers and guide rails 30 are used.

As it moves in the direction of the shed 7, the gripper 6 grasps the weft thread 1 presented transversely. For this purpose, the gripper 6 is equipped with clamping elements 31, which are actively actuated by controls, not shown. Of course, the gripper 6 as a clamping element 31 and a spring-loaded gripper clamp only possible that does not need to be actively opened to accommodate the thread can. Such gripper clamps are known in the art. Also known are the elements that serve the gripper 6 in each

Web cycle in the shed 7 forward and back to move. In the present Example, the rigid gripper bar 32 is used - but it can also be a flexible band used. The gripper bar 32 or a corresponding rapier band are reversibly driven by a transmission - such transmissions are known in the art and are therefore not further illustrated.

For the invention, it does not matter whether the gripper 6 the weft yarn 1, 2 transported across the entire width of the fabric 13 through the shed 7 or whether the weft 1, 2 is passed in the middle of the loom of a Bringergreifer to a Holergreifer to be taken by this the rest of the way through the shed 7.

FIGS. 5-7 schematically show details of a module 33 for holding and feeding a first weft thread 1 to the gripper 6 of FIG

Loom. Figures 5 -7 differ in each case by the position of the clamp 1 1, which holds the weft thread 1 and the gripper 6 brings.

The provided within the scope of the invention, individual modules 33, 34 for holding and feeding each of a weft yarn 1, 2 are basically the same structure, but in this case in pairs mirror images offset at the

Loom arranged.

In the module 33 is a terminal 1 1 at the lower end of a vertically displaceable push rod 23. This push rod 23 is part of a drive 25, which brings the clamp 1 1 on a movement path 35 in different positions 16, 17, 18.

The drive 25 is in the present case designed in the manner of a sliding-crank mechanism. Some parts of the drive 25 are housed in a housing 24. The drive 25 includes a rotatably mounted in the housing 24 sliding joint 37, a crank 38 and a push rod 23 which is rotatably mounted or displaceable on the crank 38 and the sliding joint 37. In the sliding joint 37, the push rod 23 which carries the terminal 1 1, displaceable. The sliding joint 37 is about a pivot point

39 with respect to the housing 24 rotatable. About the sliding joint 37 is compressed air

40 can be fed, with the help of which inside the push rod 23, a small pneumatic cylinder 41 can be operated (see Figure 12). At its upper end, the push rod 23 is fixed to the crank 38 of the slider-crank mechanism in a rotary joint 42. The crank 38 is driven by a motor 43 rotating. The module 33 for holding and feeding the first weft thread 1 is connected to an electronic control unit 44 for the drive 25 of the terminal 1 1 and for controlling the pneumatics for opening the terminal 1 1 in connection. This electronic control unit 44 for the terminal 1 1 is connected to a not shown control of the loom and with a compressed air source outside the

Loom in connection. Between the control of the loom and the control of terminal 1 1 data can be exchanged. This data also includes, for example, information about the instantaneous position of the various moving elements in the weaving cycle as well as the speed of the weaving machine.

At the control unit 44 for the terminal 1 1 or at the control of

Weaving machine are also facilities for setting or programming the control unit 44 for the terminal 1 1 available. These devices are also a determination of the start of movement of the terminal 1 1 from one of its predefined positions 17 - 19 in another predefined position 17 - 19. Furthermore, with these means for adjusting the terminals 1 1 and the times for opening and closing the terminal 1 1 can be specified in the weaving cycle. The direction of rotation of the drive 25 and the direction of movement of the terminal 1 1 on its trajectory 35 can be determined via the control unit 44 and the means for setting or programming the terminal 1 1.

The motor 43, which drives the weft holding and feeding module 33, is mounted outside the housing 24 and is connected to the crank 38 inside the housing 24 via a shaft, not shown.

Details of the terminal 1 1 are shown in the figure 12, which will be explained below. This description applies mutatis mutandis to a similar module with the second terminal 12th

In the figures 5 -7 can also be seen that in the rotation of the motor 43 in the arrow direction, the tip of the push rod 23 with the clamp attached thereto 1 1 passes through a closed path of movement 35. On this movement path 35 are the above-defined positions of the terminal 1 1: the ready position 18, the feeder position 16 and the transfer position 17.

All three are in one movement plane. The movement path 35 is therefore similar in the present embodiment, a planar ellipse with the longer axis in the vertical direction.

In principle, of course, other drives 25 of the terminal 1 1 with other forms of movement path 35 are conceivable. Essential are the three predefined positions 16-18 of the clamp 1 1 or 19-21 of the clamp 12 and the relative position of these positions relative to one another and with respect to the rest of the loom described in the context of the invention.

FIG. 8 shows the arrangement of the present elliptical trajectories 35, 36 for a device 5 with two modules 33, 34 for driving two clamps 1 1, 12.

The view is similar to Figure 2 - but enlarged. The weft threads 1, 2 were not drawn in FIG.

On the trajectories 35, 36, the two terminals 1 1, 12 are shown in the three predefined positions in Figure 8 respectively:

In the embodiment described here, two modules 33, 34 for holding and feeding a weft thread fan-shaped inclined to each other. The planes of motion are angled with respect to one another at an angle which lies in a vertical plane running in the weft direction of the weaving machine.

As can be seen in FIG. 8, this is achieved in that the longitudinal axes of the two elliptical trajectories 35, 36 of the two clamps 11, 12 strive upward apart. Thus, the ready positions 18, 21 of the two Clamps 1 1, 12 in the weft direction a greater distance from each other than the Zubringepositions 16, 19 of the two terminals 1 1, 12. The Zubringepositionen 16, 19 turn in the weft direction have a similar distance from each other as the two takeover positions 17, 20th

Figures 8 and 9 also show that the modules 33, 34 for holding and

Feeding a weft thread are arranged so that the planes of movement of the two clamps 1 1, 12 are angled with respect to the warp direction of the loom by an angle which lies in a horizontal plane of the loom. This results in that the feeder positions 16 of the clamps 1 1, 12 have a greater distance from the fabric edge 14 than the transfer positions 17, 20.

Figures 1, 2, 3 and 4 show the situation in the event that the weft thread to be introduced in the next weaving cycle is a first weft thread 1, so-called in the context of the invention (see case A above). That is, next, the first weft thread 1 is brought from the first terminal 11 from the standby position 18 to the feeder position 16.

For the distinction of the two possible processes for holding and feeding the first or second weft yarn here the term "first terminal" or "second terminal" is defined by the fact that the ready position 18 of the first terminal 1 1 arranged closer to the entry side fabric edge 14th the standby position 21 of the second terminal 12. The standby positions 18, 21 of the terminals 1 1, 12 are thus arranged offset to one another in the weft direction. The assignment of the weft threads 1, 2 to the eyelets or thread guides 22 of the color selector 4 is analogous to the assignment of the weft threads 1, 2 to the terminals. That is, the eyelet or thread guide 22 for the second weft thread 2 has a greater distance from the fabric edge 14 than the eyelet 22 for the first weft thread.

The movements of the terminals 1 1, 12 are now controlled in the weaving cycle so that the above-described, kinematically induced thread crossings of the weft threads 1, 2 can not lead to a disturbance in the weaving process.

For this purpose, in the present case in the process according to case A) the start of movement of the first terminal 1 1 is set or programmed from its standby position 18 in its Zubringeposition 16 in the weaving cycle of the loom that the Beginning of movement takes place about 10 degrees before the stop of the immediately previously entered second weft yarn 2 to the binding point.

This ensures that the first weft thread 1 crosses the course of the immediately previously entered second weft thread 2 only after this second weft thread 2 during transport through the reed 9 in the direction of the stop line 10 under the clamped in the first terminal 1 first

Weft 1 has been moved through (see Figures 2 and 3).

In the present example, however, other values for the start of movement of the first clamp 11 can also be set for the sequence according to case A), if required by the geometrical conditions, the speed of the weaving machine or the type of gripper and / or reed movement.

In principle, with the present arrangement, of course, also possible

Start of movement of a terminal from its standby position in the

To adjust feeder position, which takes place only after the stop of the immediately previously entered weft. However, the advantages according to the invention are then only partially achievable.

In FIGS. 10 and 11, the sequence described above as Case B) is shown. That is the case where the one to be entered in the next web cycle

Weft is a so-called second weft thread 2 in the context of the invention. That is, it is about the entry of a weft thread 2, which is brought from its standby position 21 in the Zubringeposition 19 and there detected by the gripper of a here designated as a second terminal 12 terminal, while the previously registered first weft thread 1 from the reed 9 to the Stop line 10 is transported or struck.

The sequence of the method according to FIGS. 10 and 11 (case B) is designed such that the movement of the second clamp 12 from the ready position 21 into the feed position 19 begins earlier in the phase of the weaving cycle, during which the previously entered first weft thread 1 is still moved by the reed 9 toward the binding point. The sequence is set so that the second weft thread 2 only intersects the course of the first weft thread 1 entered immediately after this first weft thread 1 during transport through the reed 9 in the direction of the stop line 10 above that in the second terminal 12th clamped second weft thread 2 has been moved away (see Figures 10 and 1 1). This is done by such a setting or programming of the controller 44 that the start of movement of the second clamp 12 from its standby position 21 in its Zubringeposition 19 in the weaving cycle, for example, 40 degrees before the stop of the last registered first weft thread 1. Optionally, a support of this relative movement of the two weft threads to each other by a vertical movement of one or both loops 22 of the color selector 4 with the weft threads 1 and 2 may be required.

Also in the sequence according to FIGS. 10 and 11 (case B), other values for the start of movement of the second clamp 12 can be set if the

geometric conditions, the speed of the loom or the type of gripper and / or reed movement require this.

The figure 12 shows in enlarged views details of the first terminal 1 1, and the push rod 23 with sliding joint 37 and pneumatic cylinder 41. This illustration applies mutatis mutandis to the second terminal 12th

The push rod 23 is slidably mounted in the sliding joint 37 in the longitudinal direction. The sliding joint 37 has a pivot point 39 over which it is in the

Housing 24 is rotatably mounted. The push rod 23 contains inside a pneumatic cylinder 41 which is acted upon by compressed air 40 on the upper side. By the compressed air 40, the piston 45 is pressed together with the piston rod 46 and the clamp attached thereto 1 1 down. As a result, the terminal 1 1 at the top of the push rod 23 is opened (terminal 1 1 '). When switching off the compressed air 40 via a pneumatic valve, not shown, the piston 45 is pushed together with the piston rod 46 upwards by the force of a spring 47 - the terminal 1 1 is closed. The compressed air 40 is passed through an opening 48 in the push rod 23 in the pneumatic cylinder 41. The opening 48 has the shape of a slot which is positioned so that the clamp 1 1 in the feed position 16 and in the transfer position 17 can be pneumatically opened and closed. reference numeral

1 first weft

2 second weft

3 weft supply

4 Apparatus for selecting weft threads

5 Device for holding and feeding weft threads

6 grippers

7 shed

8 warp threads

9 reed

10 stop line or binding point

1 1, 1 1 'First terminal

12 Second clamp

13 tissues

14 fabric edge

15 cutting device

16 Feeding position of the first clamp

17 Transfer position of the first terminal

18 Ready position of the first terminal

19 Feeding position of the second clamp

20 Transfer position of the second terminal

21 Ready position of the second terminal

22 eyelets of the device for selecting weft threads

23 First push rod

24 First housing

25 First drive

27 Second push rod

28 Second housing

29 Second drive

30 Guide rail for the gripper

31 clamping elements of the gripper

32 gripper bar Module for holding and feeding a first weft thread

Module for holding and feeding a second weft thread

Trajectory of the first clamp

Trajectory of the second clamp

sliding joint

crank

Fulcrum of the sliding joint in the housing

compressed air

pneumatic cylinder

Swivel of the crank

engine

Control unit for the terminals

Piston of the pneumatic cylinder

piston rod

Spring on the piston

Opening for compressed air

Claims

claims

1 . Weaving machine with a device (5) for holding and feeding of

Weft threads (1, 2) to a looper (6) of the loom with a first and a second clamp (1 1, 12) for clamping the weft threads (1, 2), and each having a drive (25, 29) for each of two terminals, with which the two terminals (1 1, 12) independently of each other along movement paths (35, 36) in a respective Zubringeposition (16, 19), a takeover position (17, 20) and a standby position (18, 21) movable are, these three positions are arranged on an entry side of the loom and wherein the respective

Delivery positions (16, 19) of the clamps (1 1, 12) are arranged in a region between a raceway of the gripper (6) and an extension of a stop line (10) of a reed (9) of the loom and wherein the respective

Transfer positions (17, 20) of the terminals (1 1, 12) in a range of

Extension of the stop line (10) are arranged and wherein the respective standby positions (18, 21) of the terminals in an area above the respective feed position and the transfer position (16, 19, 17, 20) are arranged, characterized in that the drives (25 , 29) of the clamps are formed and arranged on the loom such that the path of movement (35, 36) of each clamp has a self-contained shape, each one of them

Clamp (1 1, 12) by means of the associated drive (25, 29) in the three along the respective movement path (35, 36) successively arranged positions, namely the Zubringeposition (16, 19), the transfer position (17, 20) and the Standby position (18, 21) is movable and that the respective terminal (1 1, 12) from its standby position (18, 21) in its Zubringepositions (16, 19) is movable without being in its intermediate takeover position (17, 20) to get.

2. loom with a device (5) according to claim 1, wherein the drives (25, 29) of the terminals are designed such that the movement paths (35,

36) of the terminals each extend in planes of movement.

3. Weaving machine according to claim 1 or 2, wherein the drive (25, 29) of each terminal in each case on a separate housing or a support plate (24, 28) is arranged.

4. Weaving machine according to claim 3, wherein the modules (33, 34) with a drive (25, 29), a housing (24, 28) and a clamp (1 1, 12) in such a

Loom are arranged, that the movement planes of the clamps (35, 36) are angled with respect to a warp direction of the loom by an angle which lies in a horizontal plane of the loom.

5. Weaving machine according to claim 3 or 4, wherein the modules (33, 34) with a drive (25, 29), a housing (24, 28) and a clamp (1 1, 12) are arranged on the loom such that the planes of movement of the clamps (35, 36) are angled relative to each other at an angle which is in a vertical, in

Weft extending plane of the loom is located.

6. Weaving machine according to one of claims 1 to 5, wherein the electronic

Adjusting means or programming means are provided, with which the

Start of movement of the terminals (1 1, 12) from their respective standby position (18, 21) in their respective feed position (16, 19) in the weaving cycle of the loom is adjustable or programmable.

7. module (33, 34) for holding and feeding a weft thread (1, 2) to the gripper (6) of a loom with a housing or a support plate (24, 28), and with a clamp (1 1, 12) for the Weft thread (1, 2), as well as with a drive (25, 29), with which the clamp (1 1, 12) along a trajectory (35, 36) in different positions (16 - 18, 19 - 21) is movable, thereby

characterized in that the drive (25, 29) comprises a linkage which is designed such that the movement path (35, 36) of the clamp has a self-contained shape, so that by means of the drive the clamp (1 1, 12) in three along the movement path (35, 36) successively arranged positions (16 - 18, 19 - 21) is movable and the clamp (1 1, 12) is movable from the last of these three positions in the first of the three positions, without being in the intermediate second position to arrive.

8. module (33, 34) according to claim 7, wherein the drive (25, 29) includes a motor (43) and wherein the linkage comprises a crank (38) through which Motor (43) is further drivable with a push rod (23, 27) which is connected to the crank (38) and which is slidably mounted in a sliding joint (37), wherein the sliding joint (37) with respect to the housing (24, 28) of the module (33, 34) is mounted in a pivot point (39), further with a clamp (1 1, 12) for the weft thread, wherein the clamp (1 1, 12) attached to the push rod (23, 27) is.

9. module (33, 34) according to claim 8, wherein the push rod (23, 27) includes a pneumatic cylinder (41) with a pneumatic piston (45) and with a piston rod (46), wherein the clamp (1 1, 12) is so connected to the piston rod (46) that by pressing the pneumatic cylinder (41), the terminal (1 1, 12) can be opened or closed.

10. Method for holding, feeding and inserting weft threads (1, 2) into a shed (7) of a loom, wherein at least two weft threads (1, 2) and at least one gripper (6) for insertion of the weft threads (1, 2) are present, as well as with at least a first and a second terminal (1 1, 12), and with at least a first and a second drive (25, 29), with which the terminals independently on different trajectories (35, 36) in different Positions (16-18, 19-21) are moved, further comprising means (15) for cutting the inserted weft thread (1, 2), wherein successive weaving cycles of the loom comprise the following method steps:

Moving the first clamp (11) with an end of a first weft thread (1) clamped therein from a ready position (18) of the first clamp to a delivery position (16) of the first clamp;

Detecting the first weft thread (1) by the gripper (6);

Inserting the first weft thread (1) into the shed (7);

Moving the first terminal (1 1) in a takeover position (17) of the first

terminal;

- striking the first weft thread (1) against a stop line (10) of the loom by means of a stop movement of a reed (9);

Taking the first weft thread (1) through the first clamp (1 1); Cutting the first weft thread (1), leaving a new first

Weft end arises; Moving the first clamp (1 1) with the new end of the first weft thread (1) clamped therein out of the take-over position (17) of the first clamp into the ready position (18) of the first clamp;

Moving the second clamp (12) with an end of a second weft thread (2) clamped therein from a ready position (21) of the second one

Clamp in a feed position (19) of the second clamp;

Detecting the second weft thread (2) by the gripper (6);

Inserting the second weft thread (2) into the shed (7);

Moving the second clamp (12) to a takeover position (20) of the second clamp;

Striking the second weft thread (2) against the stop line (10) of the loom by means of the stop movement of the reed (9);

Taking the second weft thread (2) through the second clamp (12); Cutting the second weft thread (2) so that a new second weft thread end is formed;

Moving the second clamp (12) with the new end of the second weft thread (2) clamped therein from the takeover position (20) of the second clamp to the ready position (21) of the second clamp;

the method being characterized in that

the drives (25, 29) of the clamps are designed and arranged on the weaving machine such that the path of movement (35, 36) of each clamp has a self-contained shape and that each clamp (11, 12) is moved by means of the associated drive (25 , 29) in three along the respective movement path (35, 36) successively arranged positions, namely the Zubringeposition (16, 19), the takeover position (17, 20) and the standby position (18, 21) is moved and that the respective terminal ( 1 1, 12) is moved from the standby position (18, 21) into the feeder positions (16, 19) without entering the intervening transfer position (17, 20),

wherein the start of movement of the movement of at least one of the two clamps (1 1, 12) from its standby position (18, 21) in its Zubringeposition (16, 19) in the weaving cycle of the loom in a period of time, from the beginning of the stop movement of the reed (9 ) reaches the abutment line (10) of the weaving machine until the abutment of the previously inserted weft thread (1, 2).