JPH0299645A - Starting of weaving machine - Google Patents

Abstract

PURPOSE:To prevent weaving bar from occurring poor weft inserting by reversely rotating a weaving machine until weaving head of weft woven just before missed yarn reaches the neighborhood of optimum opening, releasing the weft from restriction of warp, then normally rotating the weaving machine and restarting. CONSTITUTION:A weaving machine is stopped by occurrence of poor weft inserting, the weaving machine is reversely rotated up to an angle of rotation wherein weaving head of weft 7 subjected to weft inserting just before missed yarn 71 reaches the neighborhood of optimum opening, the weft 7 is released from restriction of high and low warps 2, subjected to force in the direction separating from woven fabric, displaced to a delivery side and made almost in a straight-line state. Then the weaving machine is normally rotated and restarted so that the weft 7 inserted just before the missed yarn 71 is prevented from being folded and bent.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for starting a loom that is effective in preventing weaving rows.

Background of the Invention When a weft insertion error occurs during weaving, the loom uses a weft stop function to stop the next weft insertion while stopping at a predetermined angle. The weaving process is reversed and the weaving opening of the erroneous yarn is closed, or it is kept slightly open in preparation for removing the erroneous yarn.

Thereafter, the weaver removes the misplaced yarn from the weaving opening, reverses the loom to the starting position, and then starts the loom in the forward rotation direction. By the above-described operation, the misplaced yarn is removed from the weaving opening, so that the texture of the woven fabric continues without shifting even when the loom is restarted.

By the way, when the weft insertion defect is bent bikku, short bikku, or body cut, the weft yarn woven just before the misplaced yarn is not straight, but is bent into a crank shape, as shown in Figure 2. It is woven into the fabric and becomes a weaving stage.

The cause of this weaving step is due to the following phenomenon.

For example, when the weft insertion of a bent bik is defective, the loom prevents the next weft insertion, enters a stopping operation, and stops at a predetermined angle while applying the brake. Between the time the loom starts stopping and the time it comes to a complete stop, due to the inertia of the rotating parts, the weft thread is woven once or twice, so the weft thread that was woven just before the missed thread is , when a misplaced thread is recessed, the part where the misplaced thread exists is driven into the fabric more than it should normally be, and conversely, the part where there is no misplaced thread is driven in incorrectly, resulting in the weaving. It will exist in the direction away from the cloth. With the subsequent resumption of weaving,
The part of the weft yarn just before the miss thread that is away from the fabric is woven into the correct position by the reshaping at startup, but the part that is woven more than necessary will be returned to its original position by the subsequent reshaping. It remains in the same position and does not return to its normal position. As a result, when there is a weft insertion defect such as bent bikku, a weaving step will occur at the weft thread immediately before the misplaced thread.

Prior Art The invention disclosed in Japanese Patent Application Laid-Open No. 61-124651 is such that, when restarting a loom, the loom is reversed a predetermined number of times, and then the loom is run several times to make the loom reach a target rotational speed. This indicates that the weft movement, feed-out movement, and wind-up movement will start after this.

However, this operating method is not effective in preventing weaving steps due to poor weft insertion such as bent bik, and there is no specific disclosure regarding the starting position when restarting.

Furthermore, the invention of JP-A No. 58-197351 discloses that after the weaving opening of the weft yarn woven immediately before the miss yarn is reversed to a rotation angle of 270' near the closing end of the folding system, the loom is rotated in the normal rotation direction. It shows that it should be rotated to start. However, this invention closes the weaving opening, securely holds the weft thread at the weaving opening, and actively restrains it so that it does not displace from the woven fabric in the weaving front direction. It does not lead to the elimination of steps.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to prevent weaving steps, and in particular, to reliably prevent the occurrence of a stop step at the weft section immediately before the missed thread during hentvik, etc. The purpose is to find out how to start the loom.

In addition, if after removing the Hentwig misplaced thread, the bent weft thread that was inserted just before the misplaced thread is also pulled out, the weaving stage for the weft thread will be resolved. However, when repairing threads, it is necessary to pull out two threads, which is troublesome, and the current automatic weft repair equipment is not configured to handle the operation of pulling out two threads.

Solution to the Invention As is already clear, the reason why weaving steps occur in the part of the weft thread that is woven just before a mistake thread such as bent pink is that the weft thread just before the mistake thread is in the area where the mistake thread exists and the part where the mistake yarn exists. This causes a difference in the driving direction between the parts that are not inserted and the parts that are not. Therefore, if this difference in the amount of weaving disappears at the time of subsequent startup, the occurrence of weaving steps can be prevented.

The present invention has focused on the above points, and after removing the erroneous thread due to poor weft insertion, when restarting the loom, the weft of the weft thread woven immediately before the erroneous thread is brought into a maximum open state or a state close to this state. By reversing the loom until the loom is reversed and actively releasing the binding force of the weft threads by the upper and lower warp threads, the weft threads woven immediately before the missed threads, especially the weft threads corresponding to the areas where the missed threads were, are removed from the woven fabric. The loom is started after the weft is actively pulled apart to eliminate the bent state of the weft. Therefore, the weft yarn woven just before the misplaced yarn is corrected to a nearly straight state during the reversal process of the loom, and is woven into the correct position during the subsequent reweaving process, resulting in a normal textile weaving machine.

Loom overview FIG. 1 shows an outline of a loom 1.

The warp threads 2 are sent out from the delivery beam 3, pass through the tension rolls 4, and, by the vertical movement of the belt 5, form an opening 6 where they intersect with the weft threads 7. That is, 1, the weft thread 7 is inserted by the weft insertion means 8,
It intertwines with the warp yarns 2 and is beaten onto the front 10 by the reed 9 to form a woven fabric 11. This woven fabric 11 passes through a presto beam 12, a winding roll 13, and a guide roll 14, and is wound onto a cloth winding beam 15. The belt 5 and the reed 9 perform shedding motion and reeding motion in conjunction with the rotation of the main shaft 16.

On the other hand, in order to drive the main shaft 16, the control device 17
It is connected to the drive motor 18, brake 22, etc.
In addition to controlling the timing of the necessary movement according to the signal from the rotation angle detector 19, the sending device 20 of the sending beam 3 and the winding device 21 of the winding roll 13 are controlled, and the amount of feeding or winding is controlled. The amount is controlled in synchronization with the weaving movement (.

Structure of the Invention If, for example, a defective weft insertion occurs in a bent bik during weaving, the condition is detected by a weft stopper (not shown) and a weft stop signal is given to the control device 17.
The control device 17 stops the subsequent weft insertion, and the main shaft 16
The vehicle is stopped at a predetermined angle while applying the brake 22. During this time, the reed 9 is struck once or twice by the inertial rotation of the main shaft 16 or the like. Next, the loom 1 waits in a closed state with the bent bik miss yarn 71 woven therein by the pick finder function from the control device 17. At this time, as shown in FIG. 2(a), the weft thread 7 immediately before the miss thread 71 is woven in a crank-shaped bent state.

Thereafter, the main shaft 16 of the loom 1 is reversed manually or by the big finder operation of the control device 17, as shown in FIG. do. In this state, an automatic mistake thread removal device or a craftsman (not shown) pulls out the mistake thread 71 from the opening of the open warp threads 2, and
The main shaft 16 is reversed again and returned to the starting rotation position as shown in FIG. 2(c), and the opening 6 is closed.

After this, when the weaver gives a driving command to the control device 17, the control device 17 further reverses the main shaft 16 based on the sequence shown in FIG. The weft threads 7 are taken out, and when the rotation angle of the warp threads 2 at the weaving opening reaches the maximum opening state or a state close to it, the reversal is automatically stopped.

Operation of the invention In this state of maximum opening, the weft thread 7 of the opening is
As seen in Figure (d), the weave is released from the restraints of the upper and lower warp yarns 2, becomes free, receives a force in the direction away from the woven fabric 11, and is displaced toward the delivery side. In particular, the amount of displacement of the weft yarn 7 is large in the portion where the miss yarn 71 is present, that is, in the portion where the weft yarn is woven more than necessary. As a result, the weft yarn 7 woven immediately before the miss yarn 71 becomes almost straight.

After setting the maximum opening state in this way, control device 1
Step 7 automatically starts the drive motor 18 of the loom I and enters continuous operation. Note that during this reversal process, the feeding device 2
0 and the winding device 21 may be moved in the reverse direction in conjunction with the amount of reverse rotation, or may be in a stopped state without being correlated.

Also, at startup, if necessary, a backup operation is performed.

Therefore, the weft yarn 7 is beaten and woven at a speed close to continuous operation. Therefore, no weaving steps occur during this process.

In addition, in the above embodiment, after removing the erroneous thread 71, -
After returning to the starting rotation position (Fig. 2 (C)), the subsequent operation command brought out the weft thread 7 that had been wefted one position before the missed thread 71 and started it. It is also possible to omit the operation of returning the weft thread to the rotation position, and directly give a driving command after removing the misplaced thread 71, so that the weft thread 7 that has been wefted one position before the misplaced thread 71 is taken out and started.

Effects of the Invention In the present invention, when a weft insertion error such as bent bikku, short pick or body breakage occurs, the opening of the weft yarn woven immediately before the error yarn is set to the maximum opening state or a state close to it. Therefore, the weft yarn woven immediately before the miss yarn is released from the weaving state, that is, from the restraint of the warp yarns, and is automatically corrected into a nearly straight line by displacement in the sending direction.

Therefore, it is possible to prevent the occurrence of weaving steps due to bending of the weft yarn that has been inserted just before the wrong yarn. In addition, there is no need to remove the weft thread immediately before the missed thread, and the occurrence of a stop due to weft stoppage can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a loom, FIG. 2 is an explanatory diagram of a weave portion according to the method of the present invention, and FIG. 3 is a process diagram of the present invention. l...loom, 2...warp, 5...belt, 6...opening, 7...weft, 9...reed, 10...weaving front, 11...
・Woven fabric, 16. Main shaft, 17. Control device, 18. Drive motor, 19. Rotation angle detector, 20. Feeding device, 21. Winding device.

Claims (1)

[Claims] After removing the misplaced yarn due to the weft insertion failure from the weaving opening, when restarting the loom, first reverse the loom to a rotation angle near the maximum opening for the weft yarn that was woven just before the misplaced yarn. A method for starting a loom, which comprises releasing the weft yarn from the warp yarn and displacing it in a direction away from the woven fabric, and then rotating the loom in the forward rotation direction and starting the loom.