KR20140030305A

KR20140030305A - Method and weaving machine having an apparatus for monitoring thread overtension

Info

Publication number: KR20140030305A
Application number: KR1020147000777A
Authority: KR
Inventors: 아드난 바호우드; 하랄드 아르놀드
Original assignee: 린다우어 도르니어 게젤샤프트 엠바하
Priority date: 2011-08-08
Filing date: 2012-07-19
Publication date: 2014-03-11
Also published as: JP2014524993A; CN103717520A; WO2013020782A3; CN103717520B; KR101557248B1; EP2741988B1; DE102011080629A1; JP5829335B2; WO2013020782A2; EP2741988A2

Abstract

The present invention relates to a weaving machine having a method for monitoring thread excess tension in a weaving machine with mechanical weft insert members 1, and an apparatus for implementing the method. In this case, the yarns 2 traveling in the warp direction 20 are supplied from the yarn storage portion to the opening movement members 3 through the yarn stop motion device 4 and in the yarn on one side of the yarns 2. The signal is produced in the loom by the seal stop motion device 4 when it is below the specified tension. According to the present invention, one or more groups of yarns 2.1, 2.2 running in the warp direction 20 are separated between the yarn reservoir and the opening movement member 3, among the yarns 2.1 of the groups 2.1, 2.2. When the tension on the one side exceeds the specified tension, one or more other sides of the group (2.1, 2.2) are caused by deflection of the elastically deflected yarn deflection member (5) to the extent that the seal stop motion device (4) generates a signal. It is characterized in that the thread deflection member 5 is guided through the elastic deflecting thread deflection member 5 in such a way that the thread deflection member 5 is deflected so that the tension in the thread 2.2 is reduced.

Description

METHOD AND WEAVING MACHINE HAVING AN APPARATUS FOR MONITORING THREAD OVERTENSION}

The present invention relates to a weaving machine having a method for monitoring excess thread tension in a weaving machine and a device for monitoring excess thread tension.

In the case of a loom, devices for monitoring the tension and the path of the threads running in the warp direction are known from the prior art. An apparatus of this type and a method viable with this apparatus are for example disclosed in European patent EP 262724. Each warp is guided through its warp stop-motion drop wire, which closes the electrical contacts when the thread tension in each warp inside the loom decreases. The closing of the contact causes further processes in the weaving machine, for example a machine stop. Devices of this type are generally thread store (e.g. warp beam) and weave opening movement devices (e.g. heald shafts) for warp in the thread path. Is placed in between. The devices are used for the detection of so-called warp sticks that rupture or stick together. As such, monitoring of excess tension rise in one of the threads running in the warp direction is not possible in the prior art. This type of over tension rise can be caused, for example, by a disturbing thread path in the weaving shed in the weft insertion area of the weaving machine. The weft insertion region under consideration of the weaving machine is referred to as the front shed. The front opening is formed by two or more groups of warp threads passing through the reed from the opening movement members toward the weave point of the fabric. The two groups of warps are alternately moved into the upper opening and into the lower opening in such a way that wefts can be inserted into the resulting interstice. In order to compensate for tension fluctuations that occur in warps due to the movement of the opening movement members, typically all warps in the weaving machine are elastically deflected thread deflection members (eg spring-loaded back rest or springs). Guided through a spring plate.

The threads running in the warp direction while the threads of the front opening are caught by the weft insertion members in a desired type and manner and deflected from their normal path under the specified circumstances upon weft insertion. This can lead to rupture of the associated yarns and possibly disturbance of the movement of the weft insertion members. This process can be caused, for example, by the loom continuing to operate by reducing the tension in the warp on one side of the warp initially, to the extent that no signal from the warp stop motion device is generated. Through decreasing tension, the sagging of the yarn occurs in the upper opening, whereby the yarn can reach within the path of motion of the weft insertion members. If the yarn is caught by a weft insertion member of one of the weft inserting members, the yarn is biased about the one weft inserting member or away from the weft inserting member in a weft direction. If such additional deflection or deviation deflection is not detected in a timely manner, this can lead to significant impairment of weft insertion. However, deflection (or deflection in the opposite direction) of the warp yarns of the upper opening made at least by the weft inserting member into the lower opening results in a cross-weaving defect.

It is therefore an object of the present invention to automatically detect these types of processes in a loom.

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

The method according to the invention is used to monitor thread excess tension in a loom with mechanical weft insert members. Through the weft insert members (e.g., grippers or gripper shuttles), the weft material is inserted into the weaving opening of the weaving machine in the weft direction in known types and manners. The yarns running in the warp direction are withdrawn from the yarn reservoir (eg warp bobbin), guided through the yarn stop motion device, and then supplied to the opening movement members.

Through the movement of the opening movement members, the warp yarns form a woven opening comprising an upper opening and a lower opening. When less than the specified tension in the warp on one side of the warp, a signal is generated by the seal stop motion device (for example, warp stop motion device according to the prior art). The signal can be used, for example, to stop the loom immediately. The method according to the invention provides that, when one or more groups of yarns running in the warp direction exceed the tension specified in the yarns on one side of the yarns of the group between the yarn reservoir and the opening movement member, It is characterized in that it is guided through the elastically deflected yarn deflection member in such a way that the tension is reduced in one or more of the yarns of the group by the elastic deflection of the yarn deflection member to the extent of generating a signal.

If the thread tension increases only on one side of the yarns in the group, the biasing member is more strongly elastically deflected. However, this results in a decrease in tension in all remaining threads of the group of threads running in the warp direction. When the specified tension is exceeded in the yarn on one side of the group, the deflection reaches a range that generates a signal in the yarn stop motion device due to the decreasing tension in one or more threads on the other side of the group.

The increase in tension in the warp on one side of the group may, for example, be caught by the weft insert member of one of the weft insert members and deflected away by the weft insert member, or deflected about the weft insert member. It happens through being. With the signal generated by the warp stop motion device, the loom can be stopped immediately before the process causes further weft insertion failure or fabric defect.

Preferably for the method of the invention there is a basic thread tension in all the yarns of the associated group of warp yarns. This basic warp tension prevents the early generation of signals in the seal stop motion device in spite of the yarn tension which is changed through the opening motion in the normal weaving mode of operation without obstacles. In this case, the basic thread tension usually causes an elastic deflection of the thread deflection member in the direction in which the threads are prematurely prematurely, thereby increasing the tension in the thread on one of the threads, thereby increasing the tension of the thread deflection member in the direction. Additional elastic deflection is caused. In this case, the basic thread tension of the entire group of warp yarns is preferably produced by electromechanical means for controlling warp tension of the weaving machine in known types and manners. Depending on how much said warp tension is, respectively, the thread deflection member for guiding the group of warp yarns is somewhat strongly elastically deflected by the fluctuating basic thread tension or basic warp tension. Through this elastic deflection, in addition to the function according to the invention, even in the entire group of warp yarns, compensation of the tension change produced by the opening and moving members that move up and down can be achieved.

A preferred embodiment of the present invention is characterized in that the number of groups of warp yarns guided through the thread deflection member matches not only the elasticity of the yarn deflected in the specified type and manner, but also the elasticity and formation of the yarn deflection member. In this case, the matching starts from a position where the threads of the warp group are not disturbed in the upper opening or the lower opening, so that the failure of the thread path due to the additional deflection of the thread on one side of the threads centered on the weft insertion member is eliminated. In the yarn further deflected, it is carried out in such a way as to cause a tension rise which causes a signal to be generated by the yarn stop motion device via subsequent tension reduction in one or more other yarns of the associated group. In this case, the further deflection is such that warp yarns that must travel in a straight line from the associated opening movement member at or above the weft insertion member toward the weaving point of the fabric are instead instead from the opening movement member toward the lower or upper edge of the weft insertion member. It means the thread path that goes toward the next weaving point. In this case, the warp in the upper opening is deflected from the weft insert member to such an extent that it reaches within the lower opening, while the warp in the lower opening reaches within the upper opening according to the position at the time of further deflection by the weft insert member.

In this case, the increase in tension in the yarn further deflected through the obstacle causes additional elastic deflection of the thread deflection member for guiding the thread. This additional deflection reduces the amount of deflection or the deflection angle of the yarns in the yarn deflection member. Thus, the tension in the yarns of the yarn group is reduced.

Matching of the number of threads to the elastic and thread deflecting members of the warp yarns used, respectively, means that the warp stop motion device has an additional deflection centering around the weft insertion member in the above-described type in which the tension increase in the warp yarn on one side of the warp yarns of the group is described above. When reaching the same magnitude as it occurs at the time, it is performed in the type and manner of generating the signal.

In the case of highly elastic warp yarns, only a small increase in tension occurs in the yarn which is further deflected by the additional deflection of the type described above. Clearly early, therefore, only a small additional deflection of the thread deflection member, which is deflected by the tension of all the remaining warp yarns of each group, and by the basic warp tensions present in the threads, occurs. The number of warps in the associated group of elastic warps is too large so that the tension is further reduced enough to cause a signal in the warp stop motion device by the further deflection of the thread deflection members in the remaining warps of each group. You don't have to.

Thus, a preferred embodiment of the method according to the invention is characterized in that the group of yarns running in the warp direction, guided through the elastically deflected yarn deflection member, consists of 2 to 20 yarns.

If the warp yarns are very stiff and less elastic, when there is already a small increase in tension in one of the threads, a large additional deflection of the thread deflection member and thereby a strong decrease in tension in the remaining threads of the group. Thus, the number of yarns in the group can be more than in the case of very elastic yarns.

The method according to the invention is particularly advantageously applied in the case of very stiff and dull warps which cause significant impediments upon collision with the weft insert member. This particularly relates to warp yarns made of a strip or wire type material, as well as very dull yarns made of aramid or carbon fiber.

Due to the aforementioned relationship between the elasticity of warp yarns and the number of yarns in one group guided through a common thread deflection member, for very stiff, low elongation warp yarns, a small number of warp yarns if the total number of warp yarns in the weaving machine are preset Individual thread deflection members are also provided. The above-described method for monitoring thread excess tension in warp yarns is obvious and can also be used for monitoring of cross or standing threads when making fabrics having leno weave. . In addition, the method of the present invention can be applied for monitoring of threads (for example, catch selvedge or leno selvedge) used for forming the edge while proceeding in the warp direction.

The excess thread tension in one of the threads running in the warp direction may naturally be due to a different cause than the additional deflection through the weft insertion member. This may be, for example, the excess thread tension due to heald smash in the opening movement member of one of the opening movement members or the excess thread tension due to dropper failure in the lid of the loom. In addition, this type of excess tension can also be detected and monitored by the method according to the invention.

In a weaving machine comprising the device according to the invention and with mechanical weft inserting members, the thread excess tension in the threads running substantially in the warp direction can be monitored. The apparatus of the present invention comprises not only units for storing yarns (eg warp yarns), but also members for opening movement, and one or more yarns disposed between the storage unit of the yarns and the opening movement members in the path of the yarns. A signal may be generated when the seal stop motion device comprises a stop motion device and, when the seal stop motion device falls below a specified tension in one or more of the threads that can be monitored by the seal stop motion device.

There is also provided a yarn deflection member which can be elastically deflected, which is arranged between the storage unit of the yarns and the opening movement members in the yarn path of the group of yarns running in the warp direction.

In addition, the device of the present invention is characterized in that the elastic deflection of the yarn deflection member and its formation match the elasticity and the number of groups of yarns to be deflected while traveling in the warp direction in a specified type and manner. The matching is performed, for example, via the spring constant of the flexible spring being formed as a yarn deflection member and elastically deformable, being structurally appropriately selected. However, a configuration similar to a backrest in which a rigid deflection member is rotatably mounted and preloaded with a defined spring constant via tension or compression springs is conceivable. In the above examples of the invention the elastic deflection of the yarn deflection members and the formation thereof are centered on the weft insertion member, starting from a position free of obstacles of the group of warps within the upper or lower opening of the weaving machine. Tension rise that causes a signal to be generated by the seal stop motion device through the additional deflection of the yarn on one side of the yarns of the yarn and the subsequent decrease in tension in one or more other yarns of the associated yarn group caused by the further deflection of the yarn. The manner in which this additionally deflected yarn is produced is carried out under consideration of the elasticity and the number of groups of yarns to be deflected provided in the weaving process of the weaving machine.

By the further deflection of the yarn deflection member, the deflection of the yarns in the yarn deflection member to the magnitude of its deflection angle is reduced. Accordingly, tension reduction is subsequently provided in the yarns of the yarn group.

As mentioned above in connection with the method of the invention, there is preferably a basic warp tension in the loom. Thus, preferably the loom according to the invention provides electromechanical means for warp tension control already known from the prior art.

In order to ensure that the yarns guided through the yarn deflection member in the warp direction cannot be diverted in the weft direction, the yarn deflection member is preferably one or more thread guides capable of guiding the yarns running in the warp direction in the weft direction. Member.

As described above in connection with the method of the invention, preferably only a relatively small number of warps to be monitored are guided together through the thread deflection member. Thus, in order to allow a large number of warps to be monitored, a plurality of thread deflection members for a plurality of groups of yarns running in the warp direction are preferably distributed over the width of the weaving machine.

Particularly preferred embodiments of the thread deflection members can be achieved through the fact that the thread deflection members are formed as flexible springs consisting of partial segments connected to each other of a single spring plate.

1 is a schematic diagram of one embodiment of a device according to the invention.

In figure 1 an illustration of a weaving machine according to the invention with a device for monitoring the excess thread tension is shown. The weaving machine 1 comprises a gripper 1 for inserting the wefts into the weaving opening. However, looms of this type often have two grippers 1, one of which grippers move the weft to the center of the fabric 9, while the other gripper moves the weft from the center outwards. Pull it toward you.

The warp yarns 2 can be withdrawn from a warp bobbin, for example, arranged on top of the weaving machine, and run substantially in the warp direction 20 in the weaving machine. The opening movement members 3 are provided with inlets 3. 1 which are alternately moved up and down via an opening movement driving device (for example, a dobby machine including carp shafts), which is not shown in this example. . In Fig. 1 a weaving machine including warp yarns 2 is shown, which warp yarns 2 are introduced into the upper opening 21 and into the lower opening 22 by the movement of the opening movement members 3. In a manner that is moved in a circular manner, it is guided by the infants 3.1. As the aperture movement drive device, a jaquard machine having a harness for aperture movement of the infants 3.1 can also be used.

In addition, the weaving machine also includes a warp stop motion device 4 which is arranged between the warp reel and the opening movement members 3 in the path of the warp yarns 2. The warp stop motion device 4 preferably has warp stop motion droppers 4. 1, of which warp stop motion droppers are assigned to one of the warp threads 2. However, another seal stop motion device principle (e.g., an optical system) can also be used which can determine the decreasing thread tension or the altered thread path of the yarns 2 caused thereby.

When withdrawing the warp yarns 2 from the warp reel, the warp tension control units establish the basic warp tension in the warp yarns 2. Warp tension control of this type is known to those skilled in the art and will not be further described herein. Due to the basic warp tension, the warp stop motion dropper 4. 1 is gripped on top of the contact rail 4. 2. When the specified seal tension is less than or when the warp yarn 2 is broken, the warp stop motion dropper 4.1 closes the electrical contact while falling onto the contact rail 4.2. Thus, a signal is generated at the loom.

In addition, the weaving machine according to FIG. 1 comprises a spring plate 7 consisting of a plurality of partial segments 7.1. Each partial segment 7.1 forms a yarn deflection member 5. The spring plate-like partial segments 7.1 can be elastically deformed, whereby deflection is provided in the direction in which the warp yarns 2 are deflected by the thread deflection members 5 in the thread deflection members 5. Each thread deflection member 5 is arranged between the warp reel and the opening movement member 3 in the thread path of the group of warp yarns 2.1, 2.2.

In the normal weave mode of operation, tension fluctuations in the warp yarns 2 occur due to the alternating vertical motion of the opening movement members 3. This tension fluctuation is compensated by the elastic deflection of the yarn deflection members 5 to such an extent that no signal is still caused by the warp stop motion device 4 in the normal weave mode of operation. In this case, the maximum thread tension occurs when all the warp yarns 2 are located in the upper opening 21 or in the lower opening 22. The minimum thread tension occurs when the ingots 3.1 are all at the same height, ie in the closed opening of the loom. The position of the thread deflection members 5 and the warp stop motion device 4 in the thread path of the warp yarns 2 are preferably selected such that the above-described function is ensured. This corresponds to the approach and function of those skilled in the art in backrest units known in the art.

In addition, the weaving machine according to FIG. 1 also comprises a lid 8 which carries the wefts inserted by the gripper 1 into the weaving openings to the weaving point 24 of the fabric 9.

The spring stiffness of the spring plate 7 comprising the partial segments 7.1 matches the number of yarns 2 guided through the yarn deflection member 5 and its elongation to elasticity. This is done in this example with only two warp yarns 2.1 and 2.2, since the high stretchability of the warp yarns 2 is used. In this case, the bending stiffness of the spring plate 7 is selected rather low, whereby a small increase in tension in the warp on one side of the two warp yarns 2.1 already causes a clear further deflection of the thread deflection member 5, This causes a sufficiently high tension reduction in the warp yarns 2.2 on the other side of the group.

The elastic deflection of the thread deflection member 5 starts from the position where the warp yarn 2.1 is not disturbed in the upper opening 21 through the structural design of the bending rigidity of the spring plate 7, thereby holding the gripper 1. Due to the further deflection of the warp yarn 2.1 centered, the yarn deflection member 5 reduces the tension that causes the warp stop motion dropper 4.1 to fall from the warp stop motion device 4 onto the contact rail 4.2. A tension increase that is sufficiently elastically deflected to cause at warp 2.2 is selected to be produced at warp 2.1. This then generates a signal in the weaving machine which preferably stops the weaving machine immediately.

With respect to warp yarns 2.2 which are further deflected from the position free of their obstruction in the lower opening 22 by the gripper 1, the same considerations for naturally configuring the elastic deflection of the thread deflection member 5 apply. do. The configuration is preferably carried out in such a way that reliable monitoring of the thread excess tension is ensured for both cases of failure.

In addition, the thread deflection members 5 of the weaving machine according to FIG. 1 also have edge limiting or thread guide members 6 which prevent warps from slipping away from the thread deflection members 5 in the weft direction 23. Include. In order to achieve reliable monitoring of the thread excess tension in the warp yarns 2 during operation of the weaving machine according to FIG. 1, the warp yarns are guided through the thread deflection members 5 according to the method described above.

1: weft insertion member
2: thread running in warp direction
3: opening movement member
3.1: carp in the opening movement member
4: warp stop motion device
4.1: Warp Stop Motion Dropper
4.2: contact rail
5: thread deflection member
6: thread guide member
7; Spring plate
7.1: partial segments
8: lead
9: fabric
20: warp direction
21: upper opening
22: lower opening
23: weft direction
24: weave point

Claims

The yarns 2 traveling in the warp direction 20 are supplied from the yarn storage portion to the opening movement members 3 through the yarn stop motion device 4, and the tension specified in the yarn on one side of the yarns 2. In a method for monitoring thread excess tension in a weaving machine with mechanical weft insert members (1) in which a signal is produced in the weaving machine by the thread stop motion device (4) when less than.
One or more groups of yarns 2.1, 2.2 running in the warp direction 20 are between the yarn reservoir and the opening movement member 3, with one of the yarns 2.1, 2.2 of the group ( When the tension specified in 2.1) is exceeded, one or more of the yarns 2.2 on the other side of the group 2.1, 2.2 are deflected by the deflection of the elastically deflected yarn deflection member to the extent that the yarn stop motion device 4 generates a signal. And the elastically deflected yarn deflection member (5) is guided through the elastically deflected yarn deflection member (5) in such a way that the elastic deflected yarn deflection member (5) is deflected so that the tension is reduced.

The method of claim 1,
The number of threads of one or more groups 2.1, 2.2 of yarns 2 running in the warp direction 20 is equal to the groups 2.1, 2.2 in the upper opening 21 of the weaving machine or in the lower opening 22 thereof. Starting from an undisturbed position of the yarns of the yarns), the failure of the yarn path due to the further deflection of the yarn 2.1 on one side of the yarns centered on the weft inserting member 1 is caused by the further deflected yarns 2.1. In the manner in which the tension rises to a degree such that a signal is generated by the seal stop motion device 4 via subsequent tension reduction in one or more other threads 2.2 of the associated group. , 2.2) and the elastic deflection of the thread deflection member (5).

3. The method according to claim 1 or 2,
A method of monitoring excess thread tension, characterized by using a strip or wire type of material for the threads (2) running in the warp direction (20).

4. The method according to any one of claims 1 to 3,
A group of yarns (2.1, 2.2) guided through the elastically deflected yarn deflection member (5) while traveling in the warp direction (20) consists of two to twenty yarns (2) Monitoring method.

Units for storing the yarns running in the warp direction 20, mechanical weft inserting members 1, members 3 for opening movement, the storage unit of the threads in the path of the threads 2 and the Disposed between the opening movement members 3, capable of generating a signal in the loom when below the specified yarn tension in one or more of the threads 2 that can be monitored by the yarn stop motion device 4. One disposed between the storage unit of the seals 2 and the opening movement member 3 in the seal path of the group of seals 2.1, 2.2 running in the seal stop motion device 4 and the warp direction 20. In the loom provided with the apparatus for monitoring the thread excess tension which includes the above thread deflection member 5,
The elastic deflection of the yarn deflection member 5 starts from the position where the yarns 2.1 and 2.2 are not obstructed in the upper opening 21 or the lower opening 22 of the weaving machine, so that the weft insertion member 1 One or more of the yarn groups 2.1, 2.2 through which the yarn deflection member 5 is guided through the yarn deflection member 5 by means of an additional deflection of the yarn 2.1 on one side of the group of yarns centered at In a manner in which tension is reduced such that a signal is generated in the weaving machine through the thread stop motion device 4 at the thread 2.2 on the other side, an increase in tension that is elastically deflected in the additionally deflected thread 2.1 is achieved. A weaving machine characterized in that it is matched to the number and the elasticity of the group of yarns (2.1, 2.2) guided through the thread biasing member (5) in a possible way.

The method of claim 5, wherein
The thread deflecting member (5) is characterized in that it comprises at least one thread guide member (6) capable of guiding the yarns (2) running in the warp direction (20) in the weft direction (23).

The method according to claim 5 or 6,
The thread deflecting member (5) is formed as an elastically deformable flexible spring.

8. The method according to any one of claims 5 to 7,
Weaving machine characterized in that a plurality of yarn deflection members (5) for a plurality of groups of yarns (2) running in the warp direction (20) are distributed over the width of the loom.

The method of claim 8,
Weaving machine characterized in that the thread deflection members (5) are formed as flexible springs consisting of partial segments (7.1) connected to each other of a single spring plate (7).

10. The method according to any one of claims 5 to 9,
The seal stop motion device (4) is characterized in that it comprises a plurality of warp stop motion droppers (4.1) and at least one contact rail (4.2).