JPH10204758A - Controller of weft holder in loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely release holding of weft woven just before reversing a loom after stopping the loom in a holder holding woven weft. SOLUTION: This controller 21 is composed of a controlling device 25 generating command of a rotation amount by using a rotation amount signal of a main shaft 27 in a loom as an input and a driving means 26 actively rotating holders by using a command of a rotation amount from the controlling device 25 in a weft holder in the loom actively rotating a pair of upper and lower holders in corresponding to a transferring speed of cloth, holding woven weft between a pair of holders and transferring the weft to a winding direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of upper and lower grippers which are driven to rotate at least one of the upper and lower grippers in a positive manner in accordance with the moving speed of the cloth so that the weft thread to be beaten by the beating means is used. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the rotation of a gripping body by a rotation driving means, in a weft weft gripping device of a loom that grips between and moves in a winding direction.

[0002]

2. Description of the Related Art As a general technique, in a woven fabric in which the weft yarn tension is set low and the weft yarn does not expand and contract, particularly in glass woven fabric, the set tension is originally low and the warp yarn tension increases due to the opening movement. The woven weft (weft at the weaving mouth) is dragged and moved by the increase in the warp tension, and the ear thread is entangled and formed in this state, so that the formation of the ear tissue is poor. In order to solve this, the following technology has been proposed.

[0003] For example, Japanese Patent Publication No. 1-60090 discloses a gripping device that forms a tuft at the end of the fabric on the yarn feeding side. The gripping device includes a rotatable disk-shaped movable clamp provided on an upper side, and a lower stationary clamp having a clamp operating surface curved in a concave arc shape extending along a part of the circumference of the clamp element. Consists of It is disclosed that the movable clamp may be driven so as to move continuously, but may be driven intermittently in phase with the same rhythm as the reciprocating movement of the reed.

However, according to the above technique, since the movable clamp can be driven only by mechanical means and in one direction, there is a disadvantage that the weft once grasped by the movable clamp cannot be released thereafter. For this reason, the removal of the weft thread with poor weft insertion is a complicated and cumbersome operation.

[0005] The above-mentioned inconvenience is caused by the actual situation
This problem can be solved by the technique disclosed in Japanese Patent Publication No. 57-38702 in addition to Japanese Patent Publication No. That is, those techniques are devices for gripping the tufts at the end of the fabric, and the device is driven positively by a first rotating body and driven by contact with the first rotating body. And a second rotating body. The drive source of the first rotating body provided on the upper side is mechanically taken in from the rotation of the cloth winding roller, and drives the triangular ear holding device at the cloth winding speed.

However, according to the above technique, since the driving source of the gripping device is taken in from the driving source of the loom by mechanical means, even if the loom is reversed and the driving source is reversed, the transmission mechanism (belt / The rotation is not accurately transmitted to the first rotating body due to play or slip of the roller, and the amount of rotation of the first rotating body cannot be set accurately. Sometimes could not be released.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gripping device for gripping a woven weft thread, in which the weft thread is gripped in an appropriate state until an ear tissue is formed to form a good ear tissue. is there.

[0008]

According to the present invention, at least one of a pair of upper and lower grippers is positively driven to rotate in accordance with a moving speed of a cloth, and is driven by beating. In a weft holding device for a weaving machine that holds a weft between a pair of holding bodies and moves the weft in a winding direction, a controller that generates a rotation amount command by inputting a rotation amount signal of a main shaft of the loom; and A control device is constituted by driving means for positively driving the gripping body to rotate by inputting a rotation amount command.

The control device controls the weft thread woven in accordance with the rotating state of the loom in an appropriate state until the ear tissue is formed. Thereby, a good ear tissue can be formed, and the ear tissue does not collapse due to a change in the warp tension. More preferably, at the time of the reverse rotation of the loom, the controller outputs a command for the amount of rotation in the reverse direction by the reverse rotation detection signal, rotates the rotation driving means, and vertically holds the weft thread inserted just before the reverse rotation of the loom. It is made to open from a pair of gripping bodies. As described above, even when the weaving machine is turned over, the upper and lower grippers can be reversed to reliably release the weft thread gripping, so that the weft thread exposed before weaving can be easily removed.

[0010]

FIG. 1 shows a weft holding device 1 for a loom.
Is shown. The weft thread gripping device 1 is installed on the weft insertion side or on the opposite weft insertion side or on both sides as shown in the figure, and includes a pair of upper and lower grippers 2, 3. These gripping bodies 2 and 3 are provided near the position before weaving, at positions where the weft thread 6 held by the cloth 4 and the catch cord 5 is sandwiched from above and below.

According to this specific example, one gripper 2 is
It is configured as a disk-shaped rotating body (pulley with a round groove), is rotatably supported by a rotating shaft 7 with respect to a bracket 8, and rotates a belt 10 and a pulley by rotating an output shaft of a motor 9 attached to the bracket 8. 11 and the like. The bracket 8 is mounted on a support bracket 12 mounted on a frame of a loom (not shown). The other gripping body 3 is fixed to, for example, a support bracket 12 and is formed of a plate that is long along the moving direction of the weft thread 6. The belt 10 and the gripper 3 are arranged so as to be in contact with each other and form a gap in which the contact portion can grip the weft yarn 6.

The weft thread 6 is inserted into the openings of the catch cord 5, the ear thread 17 and the warp thread 14 by the main nozzle 13, and is beaten by the reed 15 before weaving. The weft thread 6 inserted is held between the end of the cloth 4 and the catch cord 5 and is gripped by the gripping bodies 2 and 3. The weft yarn 6 moves with the movement of the cloth 4 in the winding direction, and the gripping by the gripping body 2 and the gripping body 3 is released, and is cut by the cutter 16 between the end of the cloth 4 and the catch cord 5. . In this embodiment, the catch cord 5 is provided on the yarn supply side, but the presence or absence of the catch cord 5 is not particularly limited.

Next, FIGS. 2 to 9 show specific examples of the pair of gripping bodies 2 and 3. FIG. 2 and FIG.
Similarly to the above example, a specific example in which the gripping body 2 is configured by a rotating disk and the gripping body 3 is configured as a flat plate that is long in the feeding direction of the cloth 4 is shown. As described above, the disk-shaped gripping body 2 is a round groove pulley, and the belt 10 in the round groove also serves as a rubber ring for preventing slip on the outer peripheral surface. In addition, like this,
When the disk-shaped gripping body 2 and the flat plate-shaped gripping body 3 are used in combination, the number of weft yarns 6 gripped by them is about one or several.

In the specific example shown in FIG. 4, a square groove is formed in the disk-shaped gripping body 2, and a belt 10 having a rectangular cross section is wound around the groove, and the belt 10 also serves as a rubber ring for preventing slippage. Here is an example.

FIGS. 5, 6 and 7 show a semi-circular or quadrangular cross section along the arc of the disk-shaped grip 2 without making the upper surface of the plate-shaped grip 3 flat. An arc-shaped groove 17 is formed, and the disk-shaped gripping body 2 is formed inside the arc-shaped groove 17.
This is an example in which a part of the disc, that is, a part of the disk is combined. By doing so, the pair of gripping bodies 2, 3
Thus, the number of the weft yarns 6 to be gripped is increased, whereby reliable gripping becomes possible.

Further, the specific example shown in FIG. 8 is an example in which the gripping body 2 is constituted by two rotating plates 18 and a rubber ring 19 for preventing slippage is wound around the outer periphery thereof. By doing so, the pair of gripping bodies 2 (the rotating plate 18 and the rubber ring 1
9) Since the number of the weft yarns 6 held between the three increases, the tension of the ear tissue can be reliably maintained, which is advantageous for weaving. Further, FIG. 9 shows an example in which both the gripping bodies 2 and 3 are formed of a disk-shaped rotating body and a rubber ring 20 for preventing slippage. In this case, both gripping bodies 2 and 3 may be driven positively in the feed direction, or only one may be driven positively and the other may be driven accordingly.

Next, FIG. 10 shows a weft holding device 1 of a loom.
Is shown. The control device 21 includes a setter 22, an angle detector 23, a controller 25, and a rotation driving unit 26. The setting unit 22 sets a driving density (amount of rotation) of the gripping bodies 2 and 3 as control objects, a driving density, and a correction amount (constant) for slip. The angle detector 23 is connected to the main shaft 27 of the loom, and generates an angle signal corresponding to the rotation angle (rotation amount) of the main shaft 27.

The controller 25 receives data from the setter 22, an angle signal from the angle detector 23, and a loom state signal (operating / non-operating, dimensioning) from a main controller (not shown) for controlling the operation of the entire loom. Motion or reverse command or signal) as an input, and in synchronization with the rotation of the main shaft 27 of the loom, the gripper 2,
The driving amount of No. 3 is obtained by calculation, a command (signal) corresponding to the driving amount, that is, the rotation amount is output and sent to the rotation driving means 26.

The rotation drive means 26 detects the rotation of the motor 9 by a rotation detector 29 while outputting a current corresponding to the rotation amount command to the motor 9, and a drive amplifier 28 which performs the rotation control by closed loop control. It is configured. Note that this control is not limited to closed-loop control, and any control may be performed as long as the phase (rotation amount) is controlled according to a drive amount command. May be controlled.

During the operation of the loom, the following control is performed. During operation, the main control unit of the loom (not shown) outputs, for example, an “L” level operation signal indicating the operation state to the controller 2.
5 is output. At this time, the controller 25 synchronizes with the rotation of the main shaft 27 of the loom and synchronizes the motor 9 with the set data.
Is obtained by calculation, and is output to the drive amplifier 28 as a rotation amount command. Here, the driving amplifier 2
Reference numeral 8 denotes a set amount of rotation, which is controlled by
The gripping body 2 is rotated in the normal rotation direction (cloth feeding direction) by rotating the rotation angle of the rotation angle of about 7 (360) degrees.

Therefore, when the weft yarn 6 is beaten by the reed 15 and is driven before weaving of the cloth 4, the weft holding device 1 grips the weft yarn 6 driven by the pair of holding bodies 2, 3 by sandwiching the weft yarn 6. I do. Thereafter, the weft yarn 6 in the gripping state is fed in the cloth feeding direction (winding direction) by the holding body 2 driven in synchronization with the rotation of the main shaft 27 of the loom in accordance with the moving speed of the cloth 4. in this way,
Immediately after the weft insertion, the weft thread 6 is gripped by the weft insertion so that the weft thread tension around the ear at the time of ear tissue formation is optimally maintained, so that the position of the weave end is stabilized and the quality of the ear tissue is improved. .

Next, in control other than the operation of the loom, for example, an operation signal of "H" level indicating a non-operation state is output from a main control unit (not shown). In this state, the loom is set to the stopped state. In this stopped state, necessary operations such as reverse rotation and jogging are performed. For example, when a loom reversal signal is provided to remove a misfilled yarn, the loom is reversed to a position where the misfilled yarn is exposed at the weaving port, while being input to the controller 25. Then, the controller 25 calculates the drive amount of the motor 9 in synchronization with the reverse rotation, and outputs the calculated drive amount to the rotation drive unit 26 as a rotation amount command. Therefore, the drive amplifier 28 drives the motor 9 in the reverse direction by the designated drive amount to rotate the gripper 2 in the reverse direction. As a result, the weft 6 held by the grippers 2 and 3 with the weft exposed before weaving due to the reversal of the loom,
It is returned by the reverse rotation drive, separated from the contact point of the pair of gripping bodies 2 and 3, and released from the pressure contact (sandwich) of the pair of gripping bodies 2 and 3. Even when the weaving machine is turned over and the weft yarn 6 is exposed before weaving, the grip of the weft yarn 6 is released, and therefore, the removal of the weft yarn 6 becomes easy.

FIG. 11 shows that in the course of the weft insertion cycles 3, 4 and 5 after the weft insertion cycles 1 and 2, the loom is stopped due to the occurrence of a stop cause (weft insertion error), and the weft insertion error is dealt with. The rotation state of the gripping body 2 in the process of re-starting the loom after reversing the loom for removing the weft yarn 6 is shown. For example, when a weft insertion error occurs in the weft insertion cycle 4, the loom rotates by inertia and stops at, for example, 200 degrees in the next weft insertion cycle 5. Also during this time, the gripping body 2 sends the weft yarn 6 in the winding direction by rotating in the normal direction near the rotation angle of 0 (360) degrees. Therefore, at the time when the loom stops, the weft yarn 6 corresponding to the weft insertion error becomes the cloth 4 (the warp yarn 1).
4) The state is completely woven.

Thereafter, when the loom starts to reverse and reaches a predetermined angle of the weft insertion cycle 4, for example, 180 degrees, the weft yarn 6 of the weft insertion error is released from the warp yarn 14, and
It is exposed before weaving. In such a reversal process,
The control device 21 rotates the gripping body 2 in the reverse direction by the rotation amount for the reverse rotation based on the angle signal from the angle detector 23 and the loom reverse rotation signal in order to release the weft yarn 6. Therefore, the weft holding device 1 also opens the weft 6 corresponding to the misinsertion error.

Here, since the weft yarn 6 corresponding to the weft insertion error is exposed before weaving, a known automatic repairing device (not shown) operates and the weft yarn 6 corresponding to the weft insertion error.
Is removed by pulling it from before weaving. Thereafter, the loom is reversed up to, for example, 300 degrees in the weft insertion cycle 3 as a starting position, and prepares for restart. In this state, the weft yarn 6 corresponding to is kept in a state of being held by the warp yarn 14. Here, the loom is in a restartable state.
At the first pick after the restart, the driving amount of the gripping body 2 is not rotated and the feed operation is not performed at the first pick as shown by the dotted line, as in the normal operation. Thereby, the gripping body 2 can grip the weft thread 6 weft-inserted after restarting the loom at a position corresponding to the weft-insertion error yarn removed earlier.

The setting of the amount of rotation of the gripping body 2 during the reverse rotation of the loom is as follows.
It is sufficient if the reverse rotation amount releases the weft yarn 6 exposed before weaving. Therefore, the rotation is not limited to the one required to rotate the required amount of rotation by one shot at a predetermined angle. The drive may be divided into several shots for each rotation angle of the loom, or may be continuously driven according to the amount of reverse rotation of the loom. Further, the setting of the reverse rotation amount is not limited to one pick, and may be an amount larger or smaller than one pick. In the above-described embodiment, the reverse rotation for removing the poor weft insertion yarn is described. However, it is needless to say that the present invention may be applied to other reverse rotation of the loom (manual operation, aligning, etc.). In addition, the loom angle signal is used to drive the gripping body in accordance with the rotation of the loom main shaft. Instead, the loom state signal input, the loom rotation speed (the number of rotations per unit time), the loom The input of the loom angle signal may be performed by detecting various parameters related to the loom rotation amount such as the rotation cycle (the time required for rotating the loom at a predetermined angle). Further, the control device 21 reverses the gripping body 2 when the loom rotates in the reverse direction, but may perform control to rotate the gripping body forward when the loom is inching.

[0027]

According to the present invention, the weft can be gripped in an appropriate state until the ear tissue is formed by the weft woven in response to the rotation of the main shaft of the loom.
The woven end is stable and a good ear tissue can be formed, and the ear tissue does not collapse due to a change in the warp yarn tension or the like.
Further, when the loom is rotated in reverse, the gripper of the gripping device is rotated in reverse to release the weft holding by the pair of upper and lower grippers, so that the weft released before weaving by the reverse rotation of the loom can be easily removed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a weft holding device of a loom;

FIG. 2 is a side view of a pair of upper and lower grips.

FIG. 3 is a sectional view of a pair of upper and lower grips.

FIG. 4 is a sectional view of a pair of upper and lower gripping bodies.

FIG. 5 is a cross-sectional view of a contact portion between a pair of upper and lower gripping bodies.

FIG. 6 is a cross-sectional view of a contact portion between a pair of upper and lower gripping bodies.

FIG. 7 is a cross-sectional view of a contact portion between a pair of upper and lower gripping bodies.

FIG. 8 is a side view of a pair of upper and lower grips.

FIG. 9 is a side view of a pair of upper and lower grips.

FIG. 10 is a block diagram of a control device.

FIG. 11 is an explanatory diagram of a rotating state of a gripping body corresponding to an operation state of forward rotation → reverse rotation → restart of the loom.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Weft holding device for loom 2 Holding member 3 Holding member 4 Cloth 5 Catch cord 6 Weft 9 Motor 21 Control device 22 Setting device 23 Angle detector 25 Controller 26 Rotation driving means 27 Main shaft of loom 28 Drive amplifier 29 Rotation detector

Claims (2)

[Claims] At least one of a pair of upper and lower grippers is positively driven to rotate to grip a weft driven by reed between the pair of grippers and move the weft thread in a winding direction. In a weft holding device of a loom, a controller that generates a rotation amount command by inputting a rotation amount signal of a main shaft of the loom, and a drive that positively drives the gripping body to rotate by inputting a rotation amount command from the controller. Means for driving a weft thread gripping device of a loom, wherein the gripping body is driven to rotate in response to rotation of a main shaft of the loom. 2. A parameter corresponding to the reverse rotation of the loom is input to the controller, and at the time of the reverse rotation of the loom, the controller outputs a command for the amount of rotation in the reverse direction corresponding to the input parameter. 2. The control device for a weft holding device for a weaving machine according to claim 1, wherein the rotation driving means is rotated to release the holding of the weft exposed before weaving from the pair of upper and lower holding bodies.