JPH0663160B2 - Method and device for processing defective wefts in shuttleless loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for processing a defective weft in a shuttleless loom, and more specifically, relates to an operation for removing a defective weft in a shuttleless loom. It is related to the improvement of the technology.

(Prior Art) When a defective weft is generated in a shuttleless loom, the loom is automatically stopped by a detection signal from the weft feeler, and the weft is almost 1
Reverse the cycle to open the shed into which the defective weft has been driven and stop, and then remove the defective weft by withdrawing.
The inventions of JP-B-56-17503, JP-A-59-21752 and JP-A-112053 have already been proposed as automatic removal operations.

By the way, in these conventionally proposed yarns, the defective weft yarns are entangled with the warp yarns closely because they are beaten in front of the cloth by a normal beating force. For this reason, even after the shed of the defective weft is opened, the defective weft is in close contact with the cloth fell, which causes some inconvenience. First, the removal element of the removal device must first capture the defective weft in the shed, but because the defective weft is in close contact with the weaving cloth, it may fail to capture it and the removal operation is unreliable. . In addition, when using spun yarn, etc., the strength unevenness is large, and this is caused by the entanglement of the defective weft and warp at the cloth fell position.
The defective weft is cut during the relative movement of the main nozzle and the reed or the removal by the removal element, and the removal work is still unreliable. Of course, if the structure of the removing device is made complicated, some reliability can be obtained (in fact, all of the above-mentioned proposals have a fairly complicated structure), but the complicated structure is preferable because it increases the manufacturing cost. No need.

(Problems to be Solved by the Invention) The problem to be solved by the present invention is how to improve the reliability of the operation of removing defective wefts generated in a shuttleless loom without complicating the structure. It is a point.

(Means for Solving the Problems) According to the present invention, the reed supported by the race provided so as to be movable back and forth with respect to the upper surface of the sley is used, and the first race supporting mechanism for generating the first pressing force is used. The race is urged toward one of the front and the back, and the second race supporting mechanism that generates the second pressing force urges the race toward the other of the front and the rear, and responds to the detection signal informing the occurrence of the defective weft. The deactivating mechanism deactivates the race supporting mechanism for urging the race forward when the beating is performed subsequent to the generation of the defective weft, and the urging by the second pressing force is released.

(Operation of the Invention) As a result of the urging by the second pressing force being released, the reed is retreated from the regular repulsion position during the repulsion following the generation of the defective weft.

(Embodiment) Although the terms "front and back" are used in this specification, "front" refers to a winding side of a woven fabric, and "rear" refers to a warp sending side. The term "horizontal movement" means a movement substantially parallel to the upper surface of the sley regardless of the position and orientation of the sley. Further, "swing" similarly refers to an arcuate movement with respect to the upper surface of the sley.

FIG. 1 shows a first embodiment of the present invention,
The reed moves horizontally due to horizontal movement. A race 3 for supporting the reed is accommodated in a groove 2a formed in the upper portion of the sley 2 fitted on the rocking shaft 1 and orthogonal to the warp direction. The width of the race 3 in the front-rear direction is the groove 2a. Smaller than that, and when the race 3 is in close contact with the front wall of the concave groove 2a (state shown in the figure), the reed is registered at the regular beating position,
When beating is performed in this state, the reed exerts a regular beating force on the cloth. A guide pin 4 is screwed onto the upper portion of the sley 2 so as to traverse the groove 2a in the front-rear direction, and the race 3 supporting the reed is loosely fitted to the guide pin 4.

A first race support mechanism 10 is provided in front of the race 3 and a second race support mechanism 20 is provided in the rear of the upper portion of the sley 2.

In the illustrated example, the first race support mechanism 10 has at least one compression spring 11 housed in a spring seat formed across the front wall of the groove 2a and the front wall of the race 3. There is.

In the case of the illustrated example, the second race support mechanism 20 has at least one fluid pressure cylinder 21 provided in the rear wall of the concave groove 2a, the piston of which contacts the rear wall of the race 3. There is.

FIG. 3 shows an example of the immobilization mechanism 30, in which each fluid pressure cylinder 21 is connected to the electromagnetic directional control valve 3 by the conduits 22 and 23.
1.Connected to a constant discharge pump 33 via a check valve 32, etc., and this constant discharge pump 33 is an electric motor.
Always operated by 34.

It is sufficient that the first pressing force generated by the first race supporting mechanism 10 is smaller than the entire second pressing force generated by the second race supporting mechanism 20 as a whole. One to one with fluid pressure cylinder 21
There is no need to install it in. However, the pressing force is Race 3
It should be applied evenly over the whole area.

When no defective weft yarn is generated, the deactivating mechanism 30 does not operate because the detection signal is not input, so that the fluid pressure cylinder 21 of the second race supporting mechanism 20 is kept in the operating state and the piston thereof protrudes to cause the race. 3 moves horizontally to the front, and the groove 2a
The reed is in close contact with the front wall of the and the reed is registered in the regular reed position. When beating is performed in this state, the repulsive beating force is exerted on the cloth.

When a defective weft is generated, a detection signal is input, the deactivating mechanism 30 is activated at a predetermined timing, the fluid pressure cylinder 21 of the second race supporting mechanism 20 is deactivated, and the piston retracts. To do. As a result, the second pressing force disappears, so that the first pressing force of the compression spring 11 of the first race supporting mechanism 10 causes the race 3 to move horizontally rearward and to closely contact the rear wall of the concave groove 2a to reed the reed. Only D in the figure is retracted from the regular beating position. When the beating is performed in this state, the reed, which should originally have been indicated by the one-dot chain line in the figure, has retreated to the position indicated by the two-dot chain line, so the reed does not exert a regular beating force on the cloth.

FIG. 2 shows a second embodiment of the present invention, in which the reed moves back and forth by rocking. Parts of the construction operation that are substantially the same as the previous one are designated by the same reference numerals.

A race 3'supporting the reed is provided with a guide pin 4'crossing the concave groove 2a in the upper part of the sley 2 at right angles to the warp direction.
Is loosely fitted into this. Other configurations of the first and second race supporting mechanisms 10 and 20 and the deactivating mechanism 30 may be the same as those described above.

When no defective weft yarn is generated, the deactivating mechanism 30 does not operate because the detection signal is not input, so that the fluid pressure cylinder 21 of the second race supporting mechanism 20 is kept in the operating state and the piston thereof protrudes to cause the race. 3'is swung forward and is recessed groove 2a
The reed is in close contact with the front wall of and the reed is registered at the regular repulsion position. When the beating is performed in this state, the reed exerts a regular beating force on the cloth.

When a defective weft is generated, a detection signal is input and the deactivating mechanism 30 is activated at a predetermined timing, the fluid pressure cylinder 21 of the second race supporting mechanism 20 is deactivating, and the piston retracts. . As a result, the second pressing force disappears, so that the first pressing force of the compression spring 11 of the first race supporting mechanism 10 causes the race 3'to swing rearward and closely contact the rear wall of the concave groove 2a. Retreat from the beating position. When the beating is performed in this state, the reed does not exert the regular beating force on the cloth as in the previous case.

It should be noted that operations such as automatic stop and reversal of the loom and removal of the defective weft, which are performed before and after the reciprocating movement of the reed according to the present invention, are appropriately performed by using known mechanisms.

Although the compression spring 11 is used for the first race support mechanism 10 in the above example, a leaf spring or the like may be used instead. In short, it is sufficient that the first pressing force is constantly generated to elastically bias the reed toward the rear.

In the above example, the fluid pressure cylinder 21 is used for the second race support mechanism 20, but a solenoid or the like may be used instead. In short, it is only necessary that the second pressing force is generated to urge the reed toward the front and the urging by the second pressing force can be released in response to the input of the detection signal of the occurrence of the defective weft.

Further, for example, a fluid pressure cylinder may be used on the first support mechanism 10 side, and a compression spring may be used on the second support mechanism 20 side. Further, when a fluid pressure piston or solenoid is used, one set of support mechanism is sufficient if the tip of the rod is fixed to the races 3, 3 '.

(Effects of the Invention) When a defective weft is generated, the reed retreats at the time of subsequent beating, so the beating force is weak and the defective weft is not driven strongly. Therefore, when the shed is opened due to the reverse rotation of the loom, there is not much entanglement between the defective weft and the warp, and the defective weft is slightly separated from the cloth fell. Therefore, the defective weft is easily caught by the removing element of the removing device, and the defective weft is less likely to be cut at this time. That is, the reliability of the work for removing the defective weft is significantly improved. Moreover, structurally, it only adds a few modifications around the race, so there is no particular complication.

[Brief description of drawings]

1 and 2 are partial sectional side views showing an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a control system thereof. 1 ... Rocking axis, 2 ... Sley 3, 3 '... Race, 4, 4' ... Guide pin 10 ... First race support mechanism 20 ... Second race support mechanism 30. mechanism

Claims (5)

[Claims] 1. A reed supported by a race that can move back and forth with respect to the upper surface of the sley. During normal operation, the reed is held in the first position so that the reed is in a regular reed position, and the defective weft A method for treating defective weft yarns in a shuttleless loom, which comprises moving a race from a first position to a second position at the rear at the time of subsequent beating according to occurrence. 2. In normal operation, the first pressing force urges the race rearward, and the second pressing force is larger than the second pressing force.
Claim 1 [1] characterized in that the race is biased forward by the pressing force of and the bias by the second pressing force is released at the time of subsequent beating in accordance with the occurrence of defective wefts. The processing method described in. 3. A reed supported by a race provided so as to be able to move back and forth with respect to the upper surface of the sley, and a first race support mechanism (10) for urging the race toward one of the front and rear by a first pressing force. ), And a second race supporting mechanism (20) for urging the race toward the other front and rear by the second pressing force, and urging the race forward at the time of subsequent beating in response to the occurrence of defective wefts. A defective weft treatment device for a shuttleless loom, which includes an inactivating mechanism (30) for inactivating the other race supporting mechanism. 4. The device according to claim 3, wherein the reed moves back and forth by horizontal movement. 5. The device according to claim [3], wherein the reed moves back and forth by rocking.