JPH0731865U - Weft end holding device for fluid jet loom - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent excessive tension when the tension is maintained until the beating by holding the end of the weft inserted on the side opposite to the weft insertion. [Structure] On the upper surface of the lower holding body 15 and the lower surface of the upper holding body 16, ridges 15 extending in a direction orthogonal to the weft flying direction, respectively.
a and 16a are provided alternately. The lower holding body 15 is fixed, the upper holding body 16 is rotated around the shaft 17 by the permanent magnet 19 and the electromagnet 20, and the end of the weft inserted between the lower holding body 15 and the upper holding body 16. Hold the department. A stopper 18 for restricting the rotation of the upper holding body 16 is provided so that the holding bodies 15 and 16 do not come into contact with each other, and the weft yarn is held by only the frictional force in a state where the weft yarn is bent by the ridges 15a and 16a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weft end holding device for a fluid jet loom.

[0002]

[Prior art]

 In a fluid jet loom, especially when using strong twist yarn as the weft yarn, keep the end of the weft yarn put in tension in order to prevent the tension of the weft yarn from being lost after weft insertion and before beating. There is a need to. Therefore, as shown in Japanese Utility Model Laid-Open No. 4-78287, as a weft end holding device, a pair of holding bodies that can be opened and closed are provided at the arrival position of the weft end on the opposite weft insertion side, and the weft insertion is performed. The end of the weft thread is sandwiched between a pair of holders to hold it in tension.

[0003]

[Problems to be solved by the device]

 However, in such a conventional weft end holding device, the weft is held by the mutual contact of the pair of holding bodies, so that the weft can be held reliably, but the tension at the moment of holding is maintained until the fabric is formed. However, there is a problem in that it may lead to fabric defects such as horizontal shrink marks and uneven texture.

That is, if the weft yarn is held in a fully stretched state by weft insertion and is beaten in this state, yarn breakage due to overtension occurs. In addition, even if the pair of holders are opened immediately before beating, the tension is rapidly lost at the same time as opening and twisting occurs, which makes it difficult to set the timing.

In view of such conventional problems, the present invention prevents the above-mentioned woven fabric defects by making it possible to pull out the weft when the tension of the weft is high when the end of the weft is held. The purpose is to do.

[0006]

[Means for Solving the Problems]

 Therefore, the present invention provides a weft end holding device for a fluid jet loom that holds the ends of the wefts inserted therein between a pair of holding bodies that can be opened and closed on the side opposite to the weft insertion side. The holding body is configured so that the holding bodies do not contact each other when closed.

[0007]

[Action]

 In the above structure, when the pair of holders is closed, the holders are prevented from contacting each other, so that when the tension of the weft thread is high, the weft thread is pulled out and the weft thread is pulled out. Since the tension can be applied, it is possible to prevent the occurrence of fabric defects such as horizontal shrinkage and uneven texture. Further, the pair of holders may be opened at an appropriate time after beating, and the opening timing may be adjusted roughly.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of a fluid jet loom. The weft yarn 1 is weft-inserted into the opening of the warp yarn 3 by a weft insertion nozzle (for example, a water jet nozzle) 2, beaten by a reed 4 to a cloth fell 5, and woven as a woven fabric 6.

A plurality of yarn end treatment yarns 7 that are opened and closed in the same manner as the warp yarns 3 are provided on the side opposite to the weft insertion side of the three warp yarns. Reference numeral 8 is a guide plate, 9 is a false twist spindle, and 10 is a belt driving mechanism. Further, a cutter 11 is provided between the woven fabric 6 and the yarn end treated yarn 7 for cutting the weft yarn 1 several picks after weft insertion.

Here, a weft end holding device 13 attached to the reed holder 12 is provided at the arrival position of the end of the weft 1 that has been wefted (on the side opposite to the weft insertion side of the yarn end treated yarn 7). There is. The weft end holding device 13 will be described with reference to FIGS. 2 is a side view of the weft end holding device 13 in an open state, FIG. 3 is a side view of the weft end holding device 13 in a closed state, and FIG. 4 is a sectional view taken along line AA of FIG.

A pair of upper and lower flat plate-shaped holders 15 and 16 are provided so as to project forward (from the cloth fell 5 side) from a support member 14 mounted on the reed holder 12 and sandwich the flight path of the weft 1. There is. Here, on the upper surface of the lower holding body 15, a plurality of ridges 15a extending in a direction orthogonal to the flight direction of the weft yarn 1 are formed in parallel, and on the lower surface of the upper holding body 16, the flight of the weft yarn 1 is also performed. A plurality of ridges 16a extending in a direction orthogonal to the running direction are formed in parallel. However, the ridges 15a on the lower holding body 15 side and the ridges 16a on the upper holding body 16 side are staggered in the flying direction of the weft 1 so that they do not overlap.

The ridges 15a and 16a are formed by welding a flat plate-like material to the plate surfaces of the holders 15 and 16 as shown in FIG. 4, and as shown in FIG. A round bar may be welded to the plate surfaces of 15 and 16, or may be integrally formed on the holders 15 and 16 by drawing or the like as shown in FIG. . The number of ridges 15a, 16a should be at least one on one side and two on the other side, for a total of three.

The tip of the lower holder 15 is bent obliquely downward, and the tip of the upper holder 16 is bent obliquely upward. The lower holder 15 has its base end fixed to the support member 14. On the other hand, the upper holding body 16 is rotatably attached to the shaft 17 which is located above the lower holding body 15 and whose base end side is provided on the support member 14 in parallel with the flight direction of the weft 1. The lower holder 15 is opened and closed by rotating about the shaft 17.

Then, a stopper 18 is fixed to the upper surface of the lower holding body 15 on the base end side, and when the upper holding body 16 is rotated around the shaft 17 counterclockwise to be closed, the rotation is stopped. The holders 15 and 16 are prevented from coming into contact with each other. That is, the convex strips 15a of the lower holding body 15 do not come into contact with the plate surface of the upper holding body 16, and the convex strips 16a of the upper holding body 16 do not come into contact with the plate surface of the lower holding body 15.

A permanent magnet 19 is attached to a portion of the upper holder 16 rearward of the shaft 17, and the permanent magnet 18 is located inside a U-shaped electromagnet 20 attached to the support member 14. The electromagnet 20 changes its polarity depending on the energization direction (+-) controlled by the control circuit 22 to which the signal from the angle sensor 21 that detects the rotation angle of the loom main shaft is input. In the case of, the lower side of the electromagnet 20 becomes the N pole and the upper side becomes the S pole, and the permanent magnet 19 is moved downward. In the negative direction, the lower side of the electromagnet 20 becomes the S pole and the upper side becomes the N pole. Is to be moved upwards.

The downward movement of the permanent magnet 19 causes the upper holder 16 to rotate clockwise as shown in FIG. 2 to form an opening between the upper holder 16 and the lower holder 15. It is possible to receive the end of the weft thread 1 that has been put in. Further, by moving the permanent magnet 19 upward, the upper holding body 16 can be rotated counterclockwise as shown in FIG. 3, and the end portion of the weft 1 can be held between the upper holding body 16 and the lower holding body 15. it can.

Next, the operation will be described. Before weft insertion, the energization direction of the control circuit 22 to the electromagnet 20 is the + direction. Therefore, the permanent magnet 19 is moved downward by the electromagnet 20, the upper holder 16 is rotated clockwise, and an opening is formed between the upper holder 16 and the lower holder 15 (see FIG. 2). Therefore, when the weft 1 is wefted into the opening of the warp 3 by the water jet of the weft inserting nozzle 2, the end of the weft 1 passes through the opening of the yarn end treatment yarn 7, and then the lower holding of the weft end holding device 13 is performed. Enter the opening between the body 15 and the upper holder 16.

Immediately after this (for example, the rotation angle of the main shaft of the loom is 290 °), the energization direction of the control circuit 22 to the electromagnet 20 becomes the − direction based on the signal from the angle sensor 21. Therefore, the permanent magnet 19 is moved upward by the electromagnet 20 and the upper holding body 16 is rotated counterclockwise to hold the end portion of the weft 1 between the upper holding body 16 and the lower holding body 15 (see FIG. 3). At this time, the rotation of the upper holding body 16 is restricted by the stopper 18, and the lower holding body 15 and the upper holding body 16 do not come into contact with each other. Since the ridges 15a and 16a extending in the direction orthogonal to the running direction are formed alternately, the weft 1 is bent in a wavy shape by these ridges 15a and 16a, and the frictional force with the ridges 15a and 16a is increased. Held by only.

Therefore, although the end portion of the weft yarn 1 in which the weft has been inserted is held by the pair of upper and lower holders 15 and 16, it is not held by the mutual contact of the pair of upper and lower holders 15 and 16. Since it is held only by the frictional force between the ridges 15a and 16a, when the tension of the weft yarn 1 is high, the weft yarn 1 is pulled out and the weft yarn 1 is pulled out. Therefore, since the tension of the weft yarn 1 is beaten in a proper state, it is possible to prevent the occurrence of a fabric defect such as a horizontal sink mark or a grained stain.

Then, at an appropriate time after beating (for example, the rotation angle of the main shaft of the loom is 30 °), the energization direction of the control circuit 22 to the electromagnet 20 becomes + direction based on the signal from the angle sensor 21. . Therefore, the permanent magnet 19 is moved upward by the electromagnet 20 and the upper holding body 16 is rotated in the clockwise direction to be separated from the lower holding body 15, whereby the weft 1 is completely released and the next weft Prepare for the case.

7 and 8 show another embodiment. The same elements as those in the above-described embodiment are designated by the same reference numerals. In this embodiment, as the weft yarn end holding device 30, a weft flight path is projected from a supporting member 31 mounted on the reed holder 12 in front of the reed 4 to the side of the weft insertion side (weft insertion nozzle side). A pair of upper and lower flat plate-shaped holding bodies 32 and 33 are provided so as to sandwich.

Here, on the plate surface of the lower holding body 32, a plurality of ridges 32 a extending in the direction orthogonal to the flight direction of the weft 1 are formed in parallel, and also on the plate surface of the upper holding body 33. A plurality of ridges 33a extending in a direction perpendicular to the flight direction of the weft 1 are formed in parallel. However, the ridges 32a on the lower holding body 32 side and the ridges 33a on the upper holding body 33 side are staggered in the flying direction of the weft 1 so that they do not overlap.

Further, the lower holding body 32 is fixed, and the upper holding body 33 is configured to open and close with respect to the lower holding body 32 by rotating around the shaft 34. Then, a stopper 35 is fixed to the upper surface of the lower holding body 32 on the base end side, and when the upper holding body 33 is rotated around the shaft 34 counterclockwise to be closed, the rotation is restricted by the stopper 35. The holding bodies 32 and 33 are prevented from contacting each other.

The point that the upper holding body 33 is driven by the electromagnet 37 provided for the permanent magnet 36 on the upper holding body 33 side is the same as in the above-described embodiment. Therefore, after the end portion of the weft thread 1 in which the weft has been inserted enters the opening between the pair of upper and lower holding bodies 32, 33, the upper holding body 33 is rotated counterclockwise so that The end portion of the weft yarn 1 is held by the upper holding body 33. At this time, the rotation of the upper holding body 33 is restricted by the stopper 35, and the lower holding body 32 and the upper holding body 33 do not come into contact with each other. Since the ridges 32a and 33a extending in the direction orthogonal to the flight direction of the weft 1 are alternately formed on the plate surface of the weft, the weft 1 is bent in a wavy shape by these ridges 32a and 33a. In this state, it is held only by the frictional force between the ridges 32a and 33a.

Therefore, although the end portion of the weft 1 in which the weft is inserted is held by the pair of upper and lower holders 32 and 33, it is not held by the mutual contact of the pair of upper and lower holders 32 and 33. Since the ridges are held only by the frictional force between the ridges 32a and 33a, when the tension of the weft 1 is high, the weft 1 is pulled out and the weft 1 is pulled out. Therefore, since the tension of the weft yarn 1 is beaten with a proper tension, it is possible to prevent the occurrence of fabric defects.

9 and 10 show another embodiment. In this embodiment, the lower holding body 41 is formed by arranging three round bars extending in a direction orthogonal to the weft flying direction in parallel, and the upper holding body 42 is arranged in parallel with the weft flying direction. It is configured by arranging two round bars extending in a direction orthogonal to each other in parallel, and they are integrated by a supporting portion (not shown). Of course, the round bar on the side of the upper holding body 41 and the round bar 42 on the side of the lower holding body 42 are offset from each other in the flight direction of the weft. A plate member having a rectangular cross section may be used instead of the round bar.

Even with the holders 41 and 42 having such a shape, the weft-inserted wefts can be bent and held only by the frictional force, and when the weft tension is high, As a result, slippage occurs, the weft is pulled out, and the weft is beaten with proper tension, so that it is possible to prevent the occurrence of fabric defects. In the above embodiment, the wefts are held only by the frictional force in a state where the wefts are bent by the ridges 15a, 16a and the like, but the present invention is not limited to this, and a simple flat plate-shaped holder is used. Even if it is used, it is possible to achieve the object of the present invention by providing a stopper that prevents these elements from contacting each other and weakening the clamping force.

In the above embodiment, the weft end holding device is attached to the reed holder to move integrally with the reed. However, the weft end holding device is fixed to the frame on the opposite weft inserting side of the loom. Good too.

[0029]

[Effect of device]

 As described above, according to the present invention, when the tension of the weft is high when the ends of the weft are held by the pair of holding bodies, the weft can be pulled out and over tension can be prevented. This has the effect of preventing the occurrence and making it possible to roughly adjust the opening timing.

[Brief description of drawings]

FIG. 1 is a perspective view of a loom showing an embodiment of the present invention.

FIG. 2 is a side view of the weft end holding device in an open state according to the embodiment.

FIG. 3 is a side view of the weft end holding device in a closed state according to the embodiment.

4 is a sectional view taken along line AA of FIG.

5 is a front view corresponding to a sectional view taken along the line AA of FIG. 3 showing a deformed form of the ridges.

FIG. 6 is a front view corresponding to a cross-sectional view taken along the line AA of FIG. 3 showing a deformation mode of the ridge.

FIG. 7 is a plan view of a loom showing another embodiment.

FIG. 8 is a front view of another embodiment of the same as above.

FIG. 9 is a perspective view of a holding body showing another embodiment.

FIG. 10 is a view on arrow B in FIG. 9.

[Explanation of symbols]

 1 Weft 2 Weft insertion nozzle 4 Reed 13 Retainer for weft end 14 Support member 15 Lower retainer 15a Convex strip 16 Upper retainer 16a Convex strip 17 Shaft 18 Stopper 19 Permanent magnet 20 Electromagnet 21 Angle sensor 22 Control circuit 30 Weft end retainer 31 Support member 32 Lower holder 32a Convex strip 33 Upper holder 33a Convex strip 34 Shaft 35 Stopper 36 Permanent magnet 37 Electromagnet 41 Lower holder 42 Upper holder

Claims (1)

[Scope of utility model registration request] 1. A weft end holding device for a fluid jet loom, which holds an end portion of a weft inserted into a weft between a pair of holding bodies that can be opened and closed on the side opposite to the weft insertion side, when the pair of holding bodies is closed. A weft end holding device for a fluid jet loom, wherein the holding bodies are configured so that the holding bodies do not contact each other.