JPS62191550A - Imperfect wefting yarn removing apparatus of shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to an incomplete weft insertion removal device for a shuttleless loom, more specifically, a fluid jet type shuttleless loom that stops due to incomplete weft insertion. The present invention relates to a device for removing incompletely inserted weft yarns (hereinafter referred to as "misplaced weft yarns") located in the warp shedding prior to automatically restarting a loom that has been suspended.

(Prior Art and its Problems) When weft insertion is incompletely performed, the loom automatically stops in the next cycle after receiving a detection signal indicating the incomplete weft insertion state. Thereafter, it is widely practiced to stop the loom in reverse at a predetermined crank angle, and restart the loom after removing the erroneous weft thread.

By the way, as a misplaced weft removal device, for example, Japanese Patent Application Laid-Open No. 59
A device as seen in Japanese Patent No. 21757 has been proposed. In this device, the weft yarn is forcibly guided to the main removing device barrel stroller by a jet of air from the sub-removal device, and the missed weft yarn is removed from the shed while being wound up by the rotation of the waist roller.

In addition, in another embodiment shown in this publication, one roller moves while guiding the weft entangled in the woven fabric from a main nozzle to the other roller, and then the pair of rollers rotates to avoid mistakes. The weft is shown being wound up from inside the shed.

However, these devices cannot be expected to reliably guide the misplaced weft, and the misplaced weft may interfere with the warp while pulling out the misplaced weft, which may cause the misplaced weft to come off the weft pulling means. , so that miss weft removal is unstable.

In addition, the distance between the main nozzle and the end of the woven fabric is generally narrow, and in a large-scale device like the one mentioned above,
This device is not only undesirable because it interferes with weft insertion during steady operation, but also increases manufacturing costs.

(Object of the Invention) This invention was proposed in view of the above-mentioned drawbacks of the conventional device, and is capable of reliably removing erroneous weft yarns, is mechanically simple, and can be installed in a narrow space between the main nozzle and the edge of the woven fabric. It is an object of the present invention to provide a device for removing incomplete weft insertion for a shuttleless loom.

(Basic structure of the invention) In order to achieve the above object, the basic structure of this invention is that during steady operation, the main nozzle MN is integrated with the tip A, and when removing a misplaced weft, the main nozzle is inserted into the main nozzle with the weft inserted. A yarn guide 1 that is spaced apart from the tip A of the nozzle MN, and a misplaced weft W that is stretched between the main nozzle tip A and the yarn guide 1 at a predetermined timing when removing the misplaced weft as a means for removing the misplaced weft. For example, a hook 5 moves forward from a standby position and engages it, moves in a predetermined direction in this state, and forcibly pulls out the missed weft W from the woven fabric; A cutter 9 is provided for cutting.

Preferably, a suction pipe 1O is formed to forcibly discharge the cut weft to the outside of the system.

More preferably, by moving the hook 5, the missed weft W
The clamper 11 located upstream of the main nozzle MN is set to be in the "closed" state when the MN is pulled out from the woven fabric, and after the cutter 9 has cut the weft by mistake, the weft tip is forcibly cut. Means 13.15 for drawing the main nozzle tip A into the main nozzle tip A is provided.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in Figures 1-1 and 2, the incomplete weft insertion yarn removal device for a shuttleless loom according to the present invention is integrally connected to the tip A of the main nozzle MN during steady operation. In addition, when removing a misplaced weft, a yarn guide 1 is provided that moves forward in the weft insertion direction and is located between the tip of the main nozzle and gI.

The forward movement of the yarn guide I in the weft insertion direction and the backward movement described below are performed by the operation of the solenoid 3.

A hook 5 is provided near the yarn guide 1 and extends in a direction intersecting the weft W. During steady operation, this hook 5 is located below the weft W, and hooks the weft W when a mistake weft is removed. It is configured to move upward and move downward at a predetermined timing. As a mechanism for holding the hook 5 and moving it up and down, for example, a reciprocating rodless cylinder 7 is used.

A suction vibrator 10 connected to a suction source (not shown) for forcibly discharging missed weft yarns (to be described later) out of the system is opened near the most -1=lifting point of the hook 5.

A cutter 9 for cutting a missed weft W, which will be described later, is provided at a predetermined position above the main nozzle MN.

Also, on the upstream side of the main nozzle MN, the clamper 1
A hook 13 is provided between the main nozzle N and the hook 13, which hooks the weft thread between the hooks at a predetermined timing and pulls the weft thread passing through the main nozzle N in the direction of pulling the weft thread back from the main nozzle. This hook 13 is actuated by a rotary actuator 15, for example.

(Action of invention) Next, the operation of this invention will be explained.

Now, when a weft insertion failure occurs and a weft feeler (not shown) detects this and outputs a loom stop signal, the weft cutting cutter 20 on the end side of the woven fabric is temporarily deactivated, and
Control is performed using a known method so that Korean input for the next pick is not performed. In this case, the loom stops with the missed weft being beaten, but next, the loom is reversed to a predetermined crank angle with the distributor 20 inactive, and the loom stops with the weft exposed. let At this time, the missed weft W continues from the woven fabric to a weft storage device (not shown).

In this state, each mechanism is in the state shown in FIGS. 1 and 2.

From this state, as shown in FIG. 3, the clamper 11 is closed, and the yarn guide 1 is then moved forward toward the woven fabric to form a predetermined gap between the main nozzle MN and the yarn guide 1. let Then, the air cylinder 7 is operated to move the hook 5 upward. Then, the missed weft W woven into the woven fabric is caught by the hook 5, lifted and pulled out.

At this time, it is most preferable that the yarn guide 1 is positioned on the extension axis of the main nozzle MN.

This is because when pulling out a missed weft, the missed weft W is forcibly guided in the direction in which it is pulled away from the fabric front side, and the resistance from the warp is minimized in the pulling direction, causing damage to the warp and missed weft. It is possible to pull out the missed weft W without causing any damage.

Next, as shown in FIG. 4, a suction source (not shown) connected to the suction pipe 10 is activated to suction the missed weft threads pulled out from the woven fabric by the hook 5, and the cutter 9 is activated to remove the weft from the suction pipe 10. The missed weft W connected from 10 to the tip of the main nozzle MN is cut. Then, the missed weft W is sucked in by the suction pipe 10 and discharged out of the system.

At this time, the cut weft yarn is hanging down from the tip of the main nozzle MN, so as shown in FIG. The weft yarn is pulled a predetermined amount toward the yarn supplying body, and the weft tip is pulled into the main nozzle. Until this state, the clamper 11 is closed and grips the weft.

Next, as shown in FIG. 6, the hook 13 is returned to its original position and the clamper 11 is opened.

Then, the main nozzle MN is activated to complete the weft thread threading. By this time, the yarn guide 1 and the hook 5 have returned to their initial standby positions. In addition, main nozzle M
It is preferable to continue injecting N even though it is weak from the state shown in FIG. 5.

After the missed weft is removed in this way, the loom is automatically or manually restarted.

(Other Embodiments) In the above description, in order to form a gap between the main nozzle MN tip A and the yarn guide 1 through which the hook 5 passes,
Although the yarn guide 1 is moved forward, the present invention is not limited to this, and the main nozzle may be moved by relatively separating the main nozzle MN tip A and the yarn guide 1. It goes without saying that the MN may be made movable in the axial direction.

Further, although the yarn guide 1 has been described as being completely separate from the main nozzle MN, the present invention is not limited to this, and the tip of the main nozzle MN may be divided into two in the axial direction.
The tip end side may be used as a yarn guide.

Furthermore, the yarn guide does not have to be resistant and located at the tip side of the main nozzle MN, as shown in Fig. 7 (A).
As shown in (B), the yarn guide la may be shaped to surround the tip of the main nozzle MN.

As a device for catching and pulling out the missed weft W, a hook 5 is attached to the reciprocating rodless cylinder 7 and the hook 5 is raised, but this catching and pulling mechanism is limited to this. For example, the 8th
As shown in the figure, it may be in the form of a roll using a pair of rollers 25, 26. In this case, during steady operation, the rollers 25 and 26 are in the standby position shown by the dotted line, and when removing the misplaced weft, they advance to the position shown by the solid line in FIG. The weft W is gripped and further rotated to pull out the misplaced weft W from the woven fabric.

(Effects of the Invention) According to the present invention, the misplaced weft W is stretched in a straight line by the main nozzle MN and the yarn guide 1 when removing the misplaced weft, so the misplaced weft W is reliably engaged with the hook 5.
This allows the weft to be reliably removed. Furthermore, since the yarn guide 1 is located within the warp opening from the front of the fabric, the misplaced weft can be pulled out smoothly, and the warp is not damaged when removing the misplaced weft.

Furthermore, the device of the present invention is mechanically simple because it only needs to pull the missed weft in a direction that intersects the weft flight line.
Furthermore, it is suitable for installation in a narrow space between the main nozzle and the end of the woven fabric, and does not interfere with weft insertion during steady operation.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the incomplete weft insertion removal device for a shuttleless loom of the present invention, Fig. 2 is a side view thereof, and Figs. 3 to 6 show the operation of the device of the present invention. 7(A) and 7(B) are a partial front view and a side view showing another embodiment of this invention. FIG. 8 is a front view showing another embodiment of this invention. It is a diagram. 1... Yarn guide 3... Solenoid 5... Hook 7... Reciprocating air cylinder 9... Cutter 10... Suction pipe 13... Hook 15... Rotary actuator 20... Cutter MN...Main nozzle W...Weft (miss weft)

Claims (1)

[Claims] A yarn guide is provided that is integrated with the main nozzle tip during steady operation, and at a predetermined timing when removing a misplaced weft, the yarn guide is connected to the main nozzle tip with the misplaced weft inserted. After the tip of the main nozzle and the yarn guide are relatively separated from each other, the main nozzle tip is set to be relatively separated from the yarn guide, and after the tip of the main nozzle and the yarn guide have been relatively separated, a pull-back operation is performed to forcibly pull back the misplaced weft inserted into the woven fabric in the opposite direction of weft insertion. 1. A defective weft insertion yarn removal device for a shuttleless loom, comprising a mechanism and a cutter for cutting, at a predetermined position, a misplaced weft that is pulled out of the woven fabric by the operation of the pull-back mechanism.