JPS6132417B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft cutting device for a shuttleless loom.

In shuttleless looms, the inserted weft yarns are cut on both sides of the woven fabric during weaving. Of these, the weft insertion side is cut before the next weft insertion, specifically at a predetermined time after reeding, and the surplus end on the opposite weft insertion side is usually cut after 2 to 3 picks.

Conventionally, a scissor-type cutter has generally been used as a weft cutting device in air-jet looms and the like. In this method, two cutting blades are crimped into scissor-like pins and pressed together, and the wefts are cut by opening and closing them in conjunction with a loom using a cam or the like.

However, the operating speed of recent looms has increased to over 500 rpm, and the scissor-type cutter can be rotated every minute.
If the tool was opened and closed 500 times, or 720,000 times in one day, the caulked portion of the two cutting blades would inevitably become loose or seize due to lack of oil after being used for a certain period of time. In addition, the cutting edge of the cutting blade may wear out and become dull, and this phenomenon becomes especially noticeable when cutting glass fibers, and the cutter may become unusable unless it is resharpened after about 40 to 50 hours. Ta.

In order to overcome these drawbacks, the applicant has developed a device particularly suitable for glass fibers.
Using a cutting member without a cutting blade as the cutting member,
The weft threads brought to a predetermined position during or after the reed beating are engaged by a pair of weft thread guides.
A device has been proposed in which the weft is cut by the edge of the cutting member that cuts between a pair of weft guides in a direction perpendicular to the weft engaged with these guides (Japanese Patent Application No. 124,658/1989).

However, since the position where the weft thread is engaged with the pair of weft thread guides even after beating is set near the extension line of the woven fabric, the weft thread is formed into a hook shape to prevent it from coming off once the weft thread is brought to the extension line. Since the weft is locked in the locking portion, the weft yarn is held in a state that is returned to the reed side rather than on the extension line, and is held in a state that is slightly slacker than when the tension is at maximum. Moreover, for materials with low elongation such as glass fiber, the weft gripper is used twice.
In order to avoid yarn breakage due to the increase in tension caused by the lengthening of the weft path during the beating process, the gripping force is weakened during this process and the weft is pulled out from the yarn supplying body to alleviate the tension. As a result, slack in the locked state was facilitated, making it impossible to ensure sufficient tension in the weft yarns, and in rare cases, the weft yarns came off from the locking portions due to vibrations of the loom, etc. .
If the weft yarn comes off in this way, it cannot be cut by the cutting member, so there is a problem that the next weft insertion cannot be carried out on the weft insertion side.

In addition, even if the weft does not come off, if the weft is loosened and locked, it will be bent by the cutting member during cutting, increasing the tension and cutting later, which will lengthen the tuft length, albeit slightly. There is a problem.

In view of these problems, the first object of the present invention is to securely retain the weft thread in the weft thread guide, and for this purpose, a pull-out prevention body is disposed in parallel with the weft thread guide, and the weft thread is removed from the weft thread guide. This prevents the pull-out prevention body from coming off. Second, the purpose is to apply tension to the weft threads before cutting to prevent them from loosening, thereby further shortening the length of the tufts, and for this purpose, the cutting member engages the weft threads before cutting the weft threads. A tension applying member is provided to apply tension to the weft yarn and then cut it with a cutting member.

Hereinafter, the present invention will be explained in detail according to illustrated embodiments.

1 to 3 show embodiments of the first invention,
In the figure, 1 is warp, 2 is weft insertion nozzle, 3 is weft, 4
5 is a reed, 5 is a woven fabric, 6 is a woven fabric, 7 is a temple bar which is fixed to the top stay 9 via a spacer (not shown), and 8 is a frame.

On the side surface of the rectangular parallelepiped bracket 10 fixed on the top stay 9 on the woven fabric 6 side, parallel to the warp threads 1,
In addition, a pair of plate-shaped weft guides 11 and 12 further extending beyond the extension line 5a of the woven fabric front 5, and a plate-shaped pull-out prevention body 30 arranged on the anti-woven fabric 6 side (bracket 10 side) from these guides 11 and 12. spacer 13 between each proximal end.
and 31 through bolt 32, 32 nut 3
2', 32', and the pair of weft guides 11, 12 are fixed with a predetermined gap (a plate-shaped body 19 to be described later).
are arranged parallel to each other so as to be able to move while contacting the side surfaces of the weft guides 11 and 12, or to be slightly larger than the thickness of the plate-shaped body 19.

Here, the pair of weft guides 11 and 12 have the same shape, and their upper edges from the tip to the middle part have inclined guide portions 11a and 12a that have the same tendency as the lower warp 1 forming the warp opening. The intermediate portions, that is, the terminal ends of the inclined guide portions 11a and 12a are provided at or near a position intersecting the extension line 5a of the fabric front 5, and a stepped portion is formed to lock the weft yarn 3 at the terminal end. For example, the locking recesses 11b, 1 as shown in the figure
2b is formed.

The lower edge of the distal end of the pull-out prevention body 30 rises diagonally upward, that is, the extension line 5a of the woven fabric 5
An edge 30b that rises sharply toward the vicinity, and an edge 30a on the distal end side that is connected to this edge 30b and bends from the vicinity of the extension line 5a and rises gently are formed. That is, when viewed from the nozzle 2 side as shown in FIG.
a) and the edge 30a form a wedge-shaped guide space 33, and the locking recess 12b (11b) and the edge 30
A closed locking space 34 is formed when viewed from the side.

The pair of weft guides 11, 12 and the pull-out prevention body 30 face a portion near the side frame 4a of the reed 4, and this portion of the reed 4 can be used as a weft guide during reed beating by removing the reed blade 4b. 11, 12 and extraction prevention body 3
An escape space 4c of 0 is formed.

On the side surface of the bracket 10 on the anti-woven fabric 6 side,
Similar to the pair of weft guides 11 and 12, a weft guide 14 having the same shape, that is, an inclined guide part 14a and a locking recess 14b, is fixed, and this weft guide 14 is attached to the side frame 4a of the reed 4. are also placed slightly outside. Then, a mounting portion 15a is attached to the upper frame 4d of the reed 4.
A guide rod 15 is provided outside the side frame 4a and extends in the extending direction of the side frame 4a, and the guide rod 15 is disposed slightly outside the weft guide 14.

On the other hand, the bracket 1 fixed to the upper frame 4d of the reed 4
Arm 1 is fixed to 6 and hangs down in front of the reed 4.
7 is provided, and a plate-shaped body 9 as a cutting member is held at the lower end of this arm 17 by a mounting piece 18. The plate-shaped body 19 may be a thin plate without a blade when cutting glass fibers, and is inserted between the pair of weft guides 11 and 12. Thus,
As the reed 4 moves, the plate-shaped body 19 moves between the pair of weft guides 11 and 12 in the front-rear direction (Figs. 2 and 5).
In the figure, the right side is the front and the left side is the rear), and when the reed 4 is at its most advanced position, it is located forward of the locking recesses 11b and 12b, and when the reed 4 is at its most retracted position, it is located at the front of the locking recesses 11b and 12b.
12b and is located in front of the weft insertion position.

Next, the action will be explained.

After the fluid is jetted from the weft insertion nozzle 2, when the weft thread gripper G releases the weft thread 3, the weft thread 3 is inserted into the opening of the warp thread 1 by the jetted fluid, and the gripper G releases the weft thread 3. After gripping the weft thread 3, the weft thread 3 pushed by the reed blade 4b and the side frame 4a is pushed by the reed blade 4b and the side frame 4a during the process of beating the inserted weft thread 3 by the advance of the reed 4. 11,1
2 along the inclined guide portions 11c and 12a,
Finally, it enters the locking recesses 11b and 12b and is locked, and while being guided by the edge 3a of the extraction prevention body 30, it reaches the edge 30b and the locking space 34
enter. Similarly, the side frame 4a and the guide rod 15
The weft yarn 3 between these, which is pushed by the weft yarn guide 14, moves along the inclined guide portion of the weft yarn guide 14, and finally enters the locking recess 14b and is locked. Therefore, even when the reed 4 is moved back after beating the reed, the weft yarn 3 remains locked in the locking recesses 11b, 12b, and 14b near the extension line 5a of the woven fabric 5. At the time of reed beating, the weft path length between the gripper G and the weave edge is lengthened, but the gripper G weakens the gripping force, so the weft 3 is completely pulled out from the yarn supplying body side by the gripper G, and the weft yarn 3 is pulled out by the gripper G from the locking recess 11b. 12b and 14b are slightly loose when locked, and in rare cases the weft guide 1
1, 12, 14, etc., the weft yarn 3 may move upward in an attempt to pull out from the locking recesses 11b, 12b, 14b, but at this time, it comes into contact with the edge 30b of the pull-out prevention body 30 and Since its movement is regulated, it cannot come off.

Thereafter, as the reed 4 moves backward, the plate-like body 19 moving between the pair of weft guides 11 and 12 approaches the locking recesses 11b and 12b, and at a predetermined time after the reed beating, the plate-like body 19 moves between the pair of weft guides 11 and 12. The edge on the 4th side is the locking recess 11b,
When the weft thread 3 is caught between the threads 12b and 12b, the weft thread 3 is cut.

Note that the pull-out prevention body 30 may be provided on the side of the weft guide 11 on the woven fabric 6 side, but in order to shorten the tuft length as much as possible, the pair of weft guides 11 and 12 are placed as close to the woven fabric 6 as possible. It is necessary to place it nearby, so
As in this example, it is desirable to provide it on the side of the weft guide 12 on the anti-woven fabric 6 side. In addition, the weft guides 11, 1
2 alone may not be able to sufficiently maintain the tension of the weft 3 during weft cutting. Therefore, another weft guide 14 is provided on the side of these pair of weft guides 11 and 12, and the locking recess 14b of this weft guide 14 is
Although the guide rod 15 for guiding the weft yarn 3 is provided, the weft yarn guide 14 and the guide rod 15 do not necessarily need to be provided. Further, instead of the locking recesses 11b and 12b, a stepped portion that is higher on the reed side may be formed.

4 to 6 show embodiments of the second invention,
The same parts as in the previous embodiment are given the same reference numerals,
Only the different parts will be explained.

The rod-shaped body 40 as a tension applying member is fixed by having its male-threaded proximal end pass through the intermediate portion of the arm 17, and clamping the arm 17 with nuts 41a and 41b that are screwed into the male-threaded portion. be.
This rod-shaped body 40 is suspended downward from the middle part, and this tip part 40a is located between the weft guide 12 and the pull-out prevention body 30, and when the reed 4 retreats, the woven fabric is It is arranged so as to cut across the vicinity of the extension line 5a.

To explain the operation, during reed beating, the weft 3 moves into the locking recesses 11b, 12b,
14b and is prevented from being pulled out from the locking recesses 11b, 12b, 14b by the pull-out prevention body 30, as in the previous embodiment.

After beating the reed, as the reed 4 retreats, the weft guide 12
The rod-shaped body 4 moves between the
0 approaches the locking space 34, engages with the weft 3 as shown in FIG. 6, bends it toward the reed 4 between the weft guides 12 and 14, and applies tension to the weft 3. Immediately after this, the plate-like body 19 moving between the pair of weft guides 11 and 12 moves into the locking recesses 11b and 12b.
When the edge of the plate-like body 19 reaches the locking recess 11
When it is caught on the weft thread 3 held between b and 12b,
Cut the weft thread 3. Therefore, if the tension applied by the rod-like body 40 is appropriately determined, the weft thread 3 will remain directly between the locking recesses 11b and 12b immediately before the plate-like member 19 comes into contact with the weft thread 3 and is cut. The length of the ear tuft can be shortened.

Note that this rod-shaped body 40 may be moved in the same manner at the same timing as described above without being fixed to the arm 17, but it is also possible to attach it to the arm 17 and make it integral with the plate-shaped body 19, and to utilize the movement of the reed 4. This has the advantage of not requiring a special drive device.

As explained above, the present invention has, firstly, a pull-out prevention body that prevents the weft from being pulled out from the weft guide to prevent the weft from coming off the guide, so that the weft can be cut reliably. Also the second
In addition, since tension is applied to the weft yarn by the tension applying member and then the weft yarn is cut by the cutting member, the cutting member comes into contact with the weft yarn and the weft yarn is cut before it is almost bent, so that the length of the selvedge can be shortened. It can be done.

[Brief explanation of the drawing]

1 to 3 show embodiments of the first invention,
Fig. 1 is a plan view, Fig. 2 is a perspective view, Fig. 3 is a partial side view, Figs. 4 to 6 show an embodiment of the second invention, Fig. 4 is a plan view, and Fig. 5 is a plan view. is a perspective view, and FIG. 6 is a partial plan view when tension is applied. 3... Weft, 4... Reed, 5... Orimae, 6... Woven fabric, 11, 12, 14... Weft guide, 11a,
12a, 14a... inclined guide section, 11b, 12
b, 14b...Locking recess, 19...Plate-shaped body, 30
... Pull-out prevention body, 34 ... Locking space, 40 ...
Rod-shaped body.

Claims (1)

[Scope of Claims] 1. Locking stages arranged in parallel on the sides of the woven fabric so as to engage the weft yarns from the reeding process to after the reeding process and guide and lock the weft yarns toward the front side of the fabric. a plurality of weft guides having a plurality of weft thread guides, a pull-out prevention body provided near these weft guides to prevent the weft thread locked in the locking stepped part from being pulled out, and a pull-out prevention body provided in the vicinity of these weft thread guides to prevent the weft thread locked in the locking stepped part from being pulled out; A weft cutting device for a shuttleless loom, comprising: a cutting member that moves so as to cut across the engaged weft after moving and beating the reed. 2. The pull-out prevention body is located on the anti-woven fabric side of the cutting member.
The weft cutting device for a shuttleless loom according to claim 1, wherein the weft cutting device for a shuttleless loom is arranged so as to restrict upward movement of the weft that is locked in the locking stepped portion of the weft guide. 3. The weft cutting device for a shuttleless loom according to claim 1 or 2, characterized in that the movement in synchronization with the loom is performed by fixing the cutting member to a reed. 4. Claim No. 4, characterized in that the weft guide has an inclined guide part having the same tendency as the lower warp forming the warp opening, and the locking step part is provided at the terminal end of the inclined guide part. The weft cutting device for a shuttleless loom according to any one of items 1 to 3. 5. Claim 1, characterized in that the weft guide is constituted by a pair of guide members sandwiching the cutting member, and another guide member disposed outward from this guide member. The weft cutting device for a shuttleless loom according to any one of items 1 to 4. 6 A plurality of weft thread guides having locking steps arranged in parallel on the sides of the woven fabric so as to engage the weft threads from the reeding process to after the reeding process and guide and lock the weft threads toward the fabric front side. and a pull-out prevention body that is provided near these weft guides and prevents the weft that is locked in the locking stepped portion from being pulled out; a cutting member that moves to cut across the engaged weft;
1. A weft cutting device for a shuttleless loom, comprising a tension applying member that moves in the vicinity of the cutting member so as to cut the weft a little faster than the cutting member. 7. The weft cutting device for a shuttleless loom according to claim 6, wherein the tension applying member is integrally provided with the cutting member. 8. The weft cutting device for a shuttleless loom according to claim 1 or 7, wherein the tension applying member is provided on the side opposite to the woven fabric from the cutting member.