JPH07102452A - Assisting apparatus for removing defective weft - Google Patents

Abstract

PURPOSE:To prevent the spring of defective weft in the removal of defective weft and consequently prevent the entanglement of yarns and enable sure removal of the defective weft by using a defective weft removing apparatus to catch and draw the defective weft at the weaving end side and pull out the weft while separating from the cloth fell. CONSTITUTION:At least one spring-inhibition member 9 is placed at a prescribed position in the direction of weaving width. A driving mechanism 5 is connected to the base of the inhibition member 9 and the tip end of the inhibition member 9 is forwarded close to the cloth fell 13 in a shed 11 in the case of extracting the defective weft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective weft removing auxiliary device, and more particularly, to an improvement of a defective weft removing device that captures and pulls defective weft yarns on the side of the weave and pulls them out while separating them from the cloth fell. .

[0002]

2. Description of the Related Art As a defective weft removing device as described above, for example, one disclosed in Japanese Patent Laid-Open No. 61-245339 is known. In this prior art, a yarn guide for catching the defective weft so that the withdrawing direction of the defective weft is closer to the center of the shed than the extension line of the cloth fell and the defective weft is not rubbed against the warp It is used. On the weft inserting side, a winding mechanism consisting of a rotating body and a winding drum is provided, and this winding mechanism pulls the defective weft through the yarn guide, so that the defective weft is moved from the cloth fell to the center of the shed. It is designed to be pulled out while being pulled toward.

[0003]

However, in the case of this prior art, there is a disadvantage that the defective weft easily jumps up during the work of removing the defective weft and is easily entangled with the warp and peripheral members. That is, the defective weft yarn is beaten in front of the weaving fabric with the tension being held internally. Therefore, when the defective weft is pulled out and a part of the defective weft is pulled away from the cloth cloth, particularly in the case of a strongly twisted yarn, the defective weft shrinks by jumping to the yarn supplying side by the action of the tension contained in itself. Sometimes. At this time, the defective weft itself contracted may be entangled at the end of the yarn on the yarn feeding side or entangled with the warp or the yarn guide, which may make it difficult or impossible to remove the defective weft after the operation. Such a phenomenon is remarkable in the rapier loom where the weft tension during weft insertion is large.

The object of the present invention is to catch and pull a defective weft on the side of the weave and pull it out while separating it from the front of the weaving machine.
As a result, it is necessary to prevent the yarn entanglement resulting therefrom and to reliably perform the defective weft removing work.

[0005]

Therefore, according to the present invention, at least one jumping-off preventing member is provided at a predetermined position in the weaving width direction, and a drive mechanism is connected to the base end of the preventing member to remove a defective weft. The gist of the present invention is to advance the tip of the blocking member to the vicinity of the cloth fell inside the shed.

[0006]

When a part of the defective weft yarn with the built-in tension is pulled away from the cloth fell, the defective weft yarn collides with the blocking member in the course of jumping and the splashing energy is absorbed,
Does not bounce up to the yarn feeding side.

[0007]

1 and 2 show an example of a defective weft removing auxiliary device according to the present invention, in which a long rod-shaped member is used as a splashing prevention member and a rotary actuator is used as a drive mechanism thereof. It is a thing. As the defective weft removing device, for example, a device for a rapier loom described in Japanese Patent Application No. 4-264952 is used. This defective weft removing device is provided on the yarn supplying side and is composed of a winding mechanism, a hook, a yarn guide, a defective weft separating mechanism, and the like.

A cloth fell supporting member 1 is provided below the cloth fell 13 of the cloth F and extends over the entire width direction of the cloth. The support member 1 has a tip curved slightly upward to support the woven fabric F from below in the vicinity of the cloth fell. A bracket 3 is engaged with two grooves 1a in the weft direction formed on the front surface of the support member 1 by bolts 4 and nuts 6, and the bracket 3 has a rotary output shaft in the weft direction. The actuator 5 is assembled. Further, a rod-like splashing prevention member 9 extending in the warp direction is attached to the output shaft of the rotary actuator 5 via a holder 7. Therefore, by loosening the nut 6, the rotary actuator 5 can move in the weaving width direction together with the bracket 3, and accordingly, the blocking member 9 can freely select its installation position in the weaving width direction. As this position, for example, the inner side is selected from the non-feeding side by 1/3 of the weaving width.

By being driven by the rotary actuator 5, the blocking member 9 moves between a standby position shown by a solid line in FIG. 2 and an operating position shown by a chain double-dashed line. As the standby position, an appropriate position below the cloth is selected so that the blocking member 9 does not interfere with the reed and the sley (not shown). The position of action is selected such that the tip of the blocking member 9 projects at least into the shed in the vicinity of the cloth fell in the shed (specifically, at a position separated from the cloth fell by about 2 to 10 mm).

Next, the operation will be described. During normal operation of the loom, the blocking member 9 is in the standby position shown by the solid line in FIG. At this time, the movement guide member 22 forming one component of the defective weft separating mechanism is in the position shown in FIG. For example, weft Y
When 4 is wefted, the corresponding selection finger F4 descends to the selected position, and the weft Y4 is captured between the fixed guide member 21 and the selection finger F4 by a rapier (not shown) that moves toward the warp shed. . As the rapier advances, the weft Y4 captured by the rapier is bent by the yarn guide 32 in the lowered position, guided between the fixed blade 33a and the movable blade 33b of the weft cutter 33, and then cut. As shown in FIG. 8, the weft Y4 put in the weft is guided by the lower side of the fixed guide member 21 in accordance with the beating, and joins with the other wefts Y1, Y2, Y3. In this way, a predetermined weft yarn is selected and weft-inserted by the rapier. When a weft insertion failure occurs during weaving, a weft corresponding to a defective weft among the weft feelers provided for each weft between a known weft feeler, that is, the selection fingers F1 to F4 and a weft storage device (not shown). The feeler outputs a weft insertion failure signal. In conjunction with the output of the weft insertion failure signal,
A loom stop signal is output. At this time, the selected finger stops operating and remains stationary in the non-selected position.
Before the defective weft is beaten by receiving the weft insertion failure signal, the movement guide member 22 constituting the separating mechanism of the defective weft removing device is moved to the separating position shown in FIG. 9 by the driving mechanism (not shown). Along with the beating, the defective weft slides on the lower side of the fixed guide member 21 and is guided to the recess formed by the moving guide member 22 and the fixed guide member 21. This separates the defective weft from the other wefts.

After that, the loom is stopped, and the defective weft yarn is shown in FIG.
As shown in (4), the fixed guide member 21 is moved into another concave portion formed in the fixed guide member 21. In this state, an unillustrated shedding device is reversed to eject the defective weft. At the same time, the selection finger corresponding to the defective weft is forcibly driven to the selection position as shown in FIG.

At this timing, the rotary actuator 5 of the auxiliary device of the present invention is activated, and the rotation of the output shaft moves the blocking member 9 to the operating position shown by the chain double-dashed line in FIG. 2 and enters the shed. .

After that, the hook 31 of the defective weft removing device descends to the position shown by the chain double-dashed line in FIG. 7 and enters between the separated defective weft and other normal wefts. Further, the hook 31 catches the defective weft thread upward in a mountain shape. This state is shown in FIG.

Thereafter, the defective weft is wound by the lever 41a of the winding drum 41 of the winding mechanism of the defective weft removing device to lock the defective weft. Since the defective weft thread is passed through the concave portion of the fixed guide member 21 which is separated from the cloth fell, it is separated from the cloth fell 13 with the winding. This state is shown in FIG.

During weaving, the weft yarn is pulled while being pulled by the rapier, so that the defective weft yarn is also beaten with the built-in tension as described above. Therefore, particularly when the weft yarn is a strong twist yarn, when the weft yarn is pulled apart to some extent from the cloth fell, the defective weft yarn jumps toward the shrinking direction, that is, toward the yarn supplying side due to the tension contained therein. However, by contacting the blocking member 9 already in the working position, the blocking weft is once blocked by the blocking member 9 during the bouncing motion of the defective weft. Immediately after this state is shown in FIG. 5, the energy loss due to this collision causes the tension of the entire defective weft to decrease, resulting in a loose state. This state is shown in FIG.

In this slack state, the defective weft is regularly taken out of the shed by the defective weft removing device.
At this time, there occurs a phenomenon that defective wefts gather on the blocking member 9, but the weft insertion side is farther from the blocking member 9 (left side in the figure).
Since the length of the defective weft is very short, it does not have a significant effect on the removal of the defective weft after that.

The range of "near the cloth fell" in the present invention is considered as follows. The blocking member needs to be close to the cloth fell so as to come into contact with the defective weft that jumps in the shrinking direction. However, if the blocking member is strongly brought into contact with the cloth fell, there is a risk that resistance may occur when removing the defective weft thread or that a weave defect may occur. Therefore, it is necessary to position the blocking member close to the cloth fell to such an extent that such inconvenience does not occur.

The range of the "predetermined position in the weft width direction" in the present invention is considered as follows. This basically indicates the range in which the defective weft yarn exists in the weft width direction. If the position of the blocking member is too close to the tip of the defective weft in the weft width direction, the defective weft may slip through the blocking member when the defective weft is contracted by the built-in tension. On the other hand, if the weft yarn is too close to the yarn supplying side, the defective weft yarn that jumps and jumps increases in length, which may cause the warp yarn and the guide member to be entangled. Therefore, it is preferable that both conditions are satisfied, and specifically, the position inside 1/3 to 1/2 of the weaving width from the anti-feeding side is preferable. Also,
The defective yarn removing device is not limited to that of the embodiment, and may be, for example, the defective yarn removing device of the fluid jet loom mechanism disclosed in JP-A-61-245339. Further, the present invention is not limited to the device provided on the yarn supplying side, and for example, may be applied to a defective yarn removing device provided on the opposite yarn supplying side and removing so-called cut yarn which is cut midway during weft insertion. .
At this time, the blocking member is provided at the "predetermined position in the weaving width direction" so as to satisfy the above condition for the bobbin cut yarn on the non-feeding side. That is, the defective yarn removing device that is a target in the present invention is not limited in its configuration as long as it is a device that is provided on the weave end side and pulls the defective yarn while separating it from the cloth fell.

Although the rod-shaped blocking member is used in the above example,
Instead of this, a plate-shaped blocking member that is thin in the weft width direction may be used. In the case of a rod-shaped blocking member, a phenomenon in which a defective weft that has jumped over is bent into a U shape over the blocking member (Fig. 5)
(Indicated by the one-dot chain line), and becomes a resistance when removing defective wefts. If the blocking member is formed in a plate shape as shown in FIG. 11, the occurrence of such a phenomenon can be prevented.

Further, in the above example, only one blocking member is used, but a plurality of blocking members may be arranged side by side in the weaving width direction. Since the range of existence of defective wefts usually varies, if a single blocking member cannot find an arrangement position that satisfies the above-mentioned "predetermined position in the weaving width direction", a plurality of blocking members must be provided. It is desirable to provide it along the weft width direction. Further, the drive mechanism may be one that linearly reciprocates the blocking member. The blocking member and the drive mechanism may be provided above the woven cloth.

The timing of advancing the blocking member into the shed is not limited to the timing after the defective weft is discharged, and may be any time from when the loom is stopped to when the defective weft is started to be extracted.

[0022]

According to the present invention, as a result of providing the blocking member, the defective weft collides with the blocking member in the course of jumping and the splashing energy is absorbed and does not bounce back to the yarn supplying side. Therefore, the defective weft yarn itself is not entangled with itself, and the warp yarn and the peripheral members are hardly entangled. As a result, there is no inconvenience that it becomes difficult or impossible to remove the defective weft thread after that.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a defective weft removing auxiliary device of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view showing the same operation.

FIG. 4 is a plan view showing the same operation.

FIG. 5 is a plan view showing the same operation.

FIG. 6 is a plan view showing the same operation.

FIG. 7 is a perspective view showing the operation of the device of the present invention.

FIG. 8 is a partially enlarged view showing the operation of the device of the present invention.

FIG. 9 is a partially enlarged view showing the operation of the device of the present invention.

FIG. 10 is a partially enlarged view showing the operation of the device of the present invention.

FIG. 11 is a side view showing another example of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cloth front supporting member 5 Rotary actuator 7 Holder 9 Blocking member 11 Shed mouth 13 Cloth front F Woven cloth

Claims (3)

[Claims] 1. A defective weft removing device for capturing and pulling a defective weft yarn on the side of the weave and pulling it out while separating it from the cloth fell, and at least one jumping prevention member provided at a predetermined position in the weft width direction, A device for removing defective wefts, which is connected to the base end of the blocking member and has a drive mechanism for advancing the tip of the blocking member to the vicinity of the cloth fell in the shed when the defective weft is removed. 2. The device according to claim 1, wherein the blocking member is rod-shaped. 3. The device according to claim 1, wherein the blocking member has a plate shape extending in the warp direction.