JPH11286851A - Weft tension controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent concentration of tension to one point of weft and to prevent a damage such as crack, loosening, breaking or fuzzing of weft. SOLUTION: This weft tension controller 2 in a fluid jetting type loom 1 has a weft stopper 10 between a yarn guide 6 at prescribed position disposed in front of the weft inserting direction of a length measuring and storing device 5 and a weft inserting nozzle 7 disposed in a slay 8, and stops a transfer of the weft 3 according to a progressing motion of the slay 8 with the weft stopper 10, then bends the weft 3 to impart a tension suitable for the weft. In the weft tension controller 2, a plurality of stoppers 11 and 12 are arranged on the weft stopper 10 in separating to the weft inserting direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fluid jet loom, comprising: a yarn guide provided forward of a length measuring and storage device in a weft insertion direction; and a weft insertion nozzle provided on a sley.
The present invention relates to a device for applying an appropriate tension to a weft yarn by a weft locking body when inserting the weft.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open Publication No. 63-46383 discloses a fluid jet loom which includes a yarn guide at a fixed position provided in front of a length measuring and storing device in a weft insertion direction and a weft insertion nozzle provided on a sley. In between, a guide member is arranged, at the time of weft insertion, the weft is bent by locking by the guide member, and immediately before the beating, the tip of the weft is stretched,
A device for applying an appropriate tension to a weft yarn on the weft insertion side is disclosed.

In Japanese Utility Model Laid-Open Publication No. 7-40788, a weft locking member is rotatable in order to reduce sudden application of a locking force (braking force) to the weft and to prevent the weft insertion from being hindered. It is proposed to configure it as a roller. According to the above-described technology, since the roller locks the weft while rotating, it is possible to reduce the momentary application of the braking force to the weft. However, even with the above technique, the braking force of the weft is not sufficiently relaxed, and the weft is bent more in order to apply a desired tension to the weft in order to provide locking at one point of the bending position of the weft. Need, so that
Since the bending angle is small, it is impossible to prevent the weft from being damaged, such as cracking, loosening, breakage, and fluff, and these appear as defects on the woven fabric.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid jet loom between a yarn guide at a fixed position provided in front of a length measuring storage device in a weft insertion direction and a weft insertion nozzle provided on a sley. A device that places a stop body and bends the weft after weft insertion by means of this weft locking body to prevent the concentration of locking force at one point in a device that applies appropriate tension to the weft just before beating on the weft insertion side The purpose of the present invention is to prevent damage such as cracking, loosening, breakage, and fluffing of the weft.

[0005]

To achieve the above object, the present invention provides a weft lock between a yarn guide at a fixed position provided in front of a length measuring storage device in a weft insertion direction and a weft insertion nozzle provided on a sley. A weft tension adjustment of a fluid jet loom that applies tension to the weft by disposing the body and locking the movement of the weft accompanying the forward movement of the sleigh by the locking portion of the weft locking body and bending the weft. In the apparatus, a plurality of locking portions are provided on the weft locking body so as to be separated from each other in the weft insertion direction.

The plurality of locking portions are inserted in the triangular area formed by a straight line connecting the yarn guide, the position of the weft insertion nozzle when the weft insertion is completed, and the beating position of the weft insertion nozzle. Are provided in the direction. And
The second and subsequent locking portions on the downstream side in the weft insertion direction from the yarn guide connect a straight line connecting two weft restraining positions adjacent to the upstream side, and connect the locking portion on the upstream side and the beating position of the weft insertion nozzle. It is arranged in a triangular area formed by a straight line and a straight line connecting the position of the weft insertion nozzle at the time of completion of weft insertion and the beating position. The weft insertion nozzle position in this case is
Refers to the weft inlet of the weft insertion nozzle. The weft engaging portion is fixed to the loom frame in a state where the position can be adjusted, and is formed of a member having a smooth curve on a contact surface or a rotatable roller.

In the process of beating after weft insertion, the weft is
The plurality of locking portions are gradually contacted and locked so as not to move. As a result, the weft is bent at a large angle, and tension is applied to the weft in a stepwise manner. In addition, the contact of the weft with the plurality of locking portions is performed with the timing shifted sequentially. Therefore, since the locking force on the weft is not concentrated on one point of the weft, and is applied in a time-dispersed state,
The disadvantages of the conventional technique can be prevented.

[0008]

FIG. 1 shows a state in which a weft tension adjusting device 2 of the present invention is incorporated in a fluid jet loom 1. In the fluid jet loom 1, the weft yarn 3 is supplied from a yarn feeder 4, and is measured by, for example, a drum-type length measuring and storing device 5 by a length necessary for one weft insertion, and until the weft insertion timing. It is stored. When the weft yarn 3 is released by the length measuring and storing device 5 at the weft insertion timing, the weft yarn 3 is guided from the yarn guide 6 at a fixed position to the weft insertion nozzle 7, and the weft insertion nozzle 7 ejects the weft yarn through the warp opening. Wefted. Here, since the weft insertion nozzle 7 is fixed to the sleigh 8, the weft insertion nozzle 7 moves forward with the beating motion, and retreats after the beating.

The weft tension adjusting device 2 of the present invention
In order to generate a tension on the weft 3 by preventing the weft 3 from moving along with the forward movement of the sley 8, 1 or 2
The above weft locking body 10 is provided. Further, in the case where the non-locked weft 3 is on the straight line AB and in the case where the locked weft 3 is on AA'B, the weft length is AB <AA'B.
And this difference is the tension applied to the weft. In this specific example, the weft locking body 10 is fixed to the loom frame 9 and has a plurality of, for example, two locking portions 11 and 12.

The two engaging portions 11 and 12 are formed by a straight line connecting the mounting position of the yarn guide 6, the position P3 when the weft insertion nozzle 7 has completed weft insertion, and the beating position P0 of the weft insertion nozzle 7. In the weft insertion direction within the area of the triangle ABC. Further, the second and subsequent locking portions 12 on the downstream side in the weft insertion direction from the yarn guide 6 are straight lines connecting the yarn guide 6 and the upstream locking portions 11, the upstream locking portion 11 and the weft insertion nozzle 7. A triangular line A'BC 'formed by a straight line connecting the beating position P0 and three straight lines connecting the position P3 when the weft insertion nozzle 7 has completed weft insertion and the beating position P0. I have.

When the weft insertion nozzle 7 completes the weft insertion along with the advance of the sleigh 8 during the weft insertion, that is, in the process of advancing the weft 3 from the position P3 immediately before reaching the yarn feeding side to the beating position P0, the weft insertion. When the nozzle 7 comes to the middle position P2, first, the weft 3 is locked by the locking portion 11, is prevented from moving in the forward direction, and bends there. The term “immediately before the arrival of the weft 3 on the non-supply side” means that the arrival position and the arrival timing of the weft 3 are not affected even if the weft 3 is locked at the most upstream locking portion and starts to bend. Say the period. In this first stage, a desired tension is applied to the weft 3.

Next, when the weft insertion nozzle 7 comes to a position P1 on a straight line connecting the locking portion 11 and the locking portion 12, the weft 3
This time, it comes into contact with the locking portion 12, and is prevented from moving in the forward direction again and bends. In this second stage, a tension close to the target final tension is applied to the weft 3. As described above, the two locking portions 11 and 12 of the weft locking body 10 come into contact with the weft 3 stepwise at different positions during the weft insertion process, and prevent movement of the weft 3 with the timing shifted. .

FIG. 2A shows the relationship between the tension of the weft 3 and the resultant force (locking force) when the weft 3 is locked at one place according to the conventional method. (2)
Shows the relationship between the tension of the weft 3 and the resultant force (locking force) when the weft 3 is locked at two places according to the present invention. As described in FIG. 1, since the weft application tension is determined by the difference in the length of the weft, the length from the yarn guide 6 to the beating position P0 of the weft insertion nozzle 7 is the same, that is, (1) in FIG. ) And (2) of FIG.
If 2 = L3 + L4 + L5, the weft tension is the same. When the same tension is applied to the weft, according to the present invention,
At each locking point, the bending angle of the weft 3 increases, so that damage to the weft 3 can be reduced. This can prevent the weft from cracking, breaking, and fluffing. At this time, the magnitude relationship between the force applied to the two locking portions 11 and 12, ie, the resultant force applied to the weft 3 at each locking position, is F1> F2 and F1> F3.
2 and F3 are also smaller than the resultant force F1. Therefore, it is possible to prevent damage such as breakage, loosening, breakage, and fluffing of the weft 3 due to a large locking force (braking force) at each locking point.

FIGS. 3 to 7 show specific examples of the locking portions 11 and 12 of the weft locking body 10. FIG. In the specific example of FIG. 3, the two locking portions 11 and 12 are configured by round rods,
The locking portions 11 and 12 are fixed to the stay 13 and are parallel to each other and are provided vertically. The stay 13 is an L-shaped bracket 1 with two bolts 14.
5 is fixed. And this bracket 15
The weft 3 is attached to the loom frame 9 by a slot 16 provided at the attachment position and a bolt 17 inserted therein so that the position of the weft 3 can be adjusted according to the type of yarn.

Next, a specific example of FIG. 4 is an example in which both ends of a single plate-like member are bent in an arc shape to form two locking portions 11 and 12 with an arc-shaped smoothly bent surface. It is. In addition,
In this example, if the on-board member is configured as a cylindrical surface on the side in contact with the weft 3, the contact area with the weft 3 is increased.

Further, a specific example of FIG. 5 is an example in which round bar-shaped locking portions 11 and 12 are provided for every two weft locking bodies 10. Here, the locking portions 11 and 12 are provided rotatably with respect to a vertical rod 19 fixed to a circular mounting seat 18. The mounting seat 18 is a permanent magnet, and is mounted at an appropriate position on the loom frame 9 by magnetic force.

FIG. 6 shows a specific example in which two locking portions 11, 1
2 is constituted by an inverted U-shaped wire,
It is fixed to. The locking portions 11 and 12 are parallel to each other and are provided vertically. Further, the specific example of FIG. 7 is an example in which the weft locking body 10 is formed by one wire, and the two locking portions 11 and 12 are integrally formed at the bent portion. According to these examples, depending on the arrangement, the inverted U-shaped wire locking portions 11 and 12 come into contact with the weft 3 at four places with a wide width, so that the same operation as having four locking portions 11 and 12 is provided. Is obtained.

The specific example described above is an example in which the locking body 10 is provided with two locking portions 11 and 12.
Three or more of 1 and 12 may be provided. Locking part 1
If three or more pieces 1 and 12 are provided, the weft 3 will contact three or more locking parts 11 and 12 at three or more positions with different timings. The positional relationship will be specifically described. In addition to the locking portions shown in FIG.
When the third locking portion is provided downstream of the weft insertion direction, the two locking portions 12 and the third locking portion are adjacent to each other. A straight line connecting the stopping portion 11, that is, the restraining position, the locking portion 12, a straight line connecting the locking portion 12 and the beating position P0 of the weft insertion nozzle, a position P3 of the weft insertion nozzle when weft insertion is completed, and a beating position It is arranged in a triangular area formed by a straight line connecting P0.

As described above, the relationship between the two adjacent locking portions is arranged so that all of the above conditions are satisfied. The restraint position means the yarn guide in the case of the two most upstream locking portions and the immediately preceding upstream locking portion in the case of other adjacent locking portions. In the case of a double nozzle having a fixed auxiliary nozzle provided between the length measuring storage device and the weft insertion nozzle, the tip of the auxiliary nozzle corresponds to the yarn guide of the present invention.

[0020]

According to the present invention, since the weft is locked at different timings at different positions at least twice or more, the tension is not gradually applied to the weft but is gradually applied. . In addition, the bending angle of the weft per one locking portion is increased, and the force applied to the locking position of the weft is reduced, so that cracking and fluffing of the weft can be prevented. Moreover,
Bending of hard weft such as glass material is improved. Further, the structure is simple, and if a fixing hole is used for the conventionally used weft tension adjusting device, no special structure is required for mounting, so that the implementation is easy.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a weft tension adjusting device of the present invention is incorporated in a fluid jet loom.

FIG. 2 is a plan view showing a bent state of the weft and a state in which tension is applied to the weft;

FIG. 3 shows a weft locking body as a main part of the present invention,
(A) is a front view, (b) is a side view, and (c) is a plan view.

FIG. 4 shows a weft locking body as a main part of the present invention,
(A) is a front view, (b) is a side view, and (c) is a plan view.

FIG. 5 shows a weft locking body as a main part of the present invention,
(A) is a front view, (b) is a plan view.

FIG. 6 shows a weft locking body as a main part of the present invention,
(A) is a front view, (b) is a side view, and (c) is a plan view.

FIG. 7 is a perspective view in which a weft locking body as a main part of the present invention is formed integrally with a wire.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fluid jet loom 2 weft tension adjusting device 3 weft 4 feeder 5 length measuring and storing device 6 yarn guide 7 weft insertion nozzle 8 sleigh 9 loom frame 10 weft lock body 11 lock section 12 lock section 13 stay 14 bolt 15 Bracket 16 Slot 17 Bolt 18 Mounting seat 19 Rod

Claims (4)

[Claims] 1. A weft locking member is arranged between a yarn guide at a fixed position provided in front of a length measuring storage device in a weft insertion direction and a weft insertion nozzle provided in a sleigh, and the sleigh is moved forward as the sleigh moves forward. The movement of the weft is locked by the locking portion of the weft locking body,
In a weft tension adjusting device for a fluid jet loom that applies tension to a weft by bending a weft, the weft locking body has a plurality of locking portions, and the locking portions are the yarns. The guide, the position of the weft insertion nozzle at the time of completion of weft insertion, and the triangular region formed by the straight line connecting the beating position of the weft insertion nozzle are provided in the weft insertion direction at a distance from each other, and the second downstream side in the weft insertion direction. Subsequent locking parts are a straight line connecting two weft restraining positions adjacent to the upstream side, a straight line connecting one upstream locking part and a beating position of the weft insertion nozzle, and a weft insertion when the weft insertion is completed. A weft tension adjusting device, which is arranged in a triangular region formed by a straight line connecting a nozzle position and a beating position. 2. The weft tension adjusting device according to claim 1, wherein the locking portion is fixed to the loom frame so that the position can be adjusted. 3. The weft tension adjusting device according to claim 1, wherein the locking portion is formed by a member having a smooth curve on a contact surface. 4. The weft tension adjusting device according to claim 1, wherein said locking portion is constituted by a rotatable roller.