JP3295246B2 - Horizontal insertion control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for changing the contact length of a weft thread to a rotating roller in a contact-type weft thread pulling device.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 5-27234 discloses a weft thread arrival period detected by a weft thread set by a pair of rotating rollers so that the detected arrival timing becomes a set arrival timing. , Or the gap between the pair of rotating rollers.
According to the above technique, stable weft insertion is not guaranteed for the following reasons.

When the towing period is changed, it is necessary to terminate the weft thread before the weft thread is locked by the locking pin of the length measuring and storing device, so that the control range is limited. As a result, reliable control of the arrival timing cannot be performed, and stable insertion cannot be ensured. In addition, when changing the rotation speed, the rotating roller rotates at a high speed exceeding 10,000 rotations per minute, so the required amount of speed change becomes large, so that the response is poor and stable insertion is performed. I can't. Further, when changing the gap between the rotating rollers, as the gap is reduced, not only is the weft thread damaged, but also the flight state of the weft thread is affected, so that weft insertion becomes unstable.

In Japanese Utility Model Laid-Open No. 3-70279, a weft thread is brought into contact with the peripheral surface of a rotating roller and pulled.
It discloses using a so-called contact-type weft pulling device to assist the weft insertion by pulling the weft yarn by a rotating roller during the weft insertion period. here,
The traction force on the weft is always set constant.

In Japanese Unexamined Patent Publication (Kokai) No. 5-272043, Japanese Unexamined Utility Model Publication (Kokai) No. 3-70279 also discloses a contact-type weft pulling device in which a pulling period and a rotating roller are used in order to keep the arrival timing of the weft constant. Can be presumed to be changed, but even if such measures are taken, the same problems as in the technique of the above-mentioned Japanese Patent Application Laid-Open No. 5-272034 remain.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize stable weft insertion by controlling the arrival timing of the weft yarn using a contact type weft yarn pulling device.

[0007]

According to the above object, the present invention detects the arrival timing of a weft yarn, compares the detected arrival timing with a target arrival timing, and, based on the deviation, detects the weft of the weft yarn with respect to a rotating roller. The contact length is changed, and the arrival timing of the weft yarn is controlled so as to approach the target arrival timing. Also, in the above control process, when the adjustment reaches the limit due to the contact length, the control auxiliaryally changes at least one of the rotation speed of the rotating roller and the weft pulling period by the rotating roller in the deviation eliminating direction. . Here, the detection position of the weft arrival timing may be on the weft flight path, and is not limited to the final arrival position on the non-supply side, and may be provided in the middle of the flight path, for example, between the reeds. .

[0008]

1, 2 and 3 show a contact-type weft pulling device 1 and a control device 2 for implementing a weft insertion control method according to the present invention. The weft yarn 3 is supplied from the yarn supplying body 4 and is wound around the outer peripheral surface of the drum 7 while being locked by the locking pin 8 in the advanced state by the rotation of the rotary yarn guide 6 of the length measuring and storing device 5. To go. The weft thread 3 in the locked state is fed to the fixed yarn guide 12, the guide hole 91 of the weft thread guide member 9 near the rotating roller 10,
It is guided to the weft insertion nozzle 11 via the fixed yarn guide 13. Here, the rotating roller 10 is connected to an output shaft of a motor 14 and is driven by a drive amplifier 15 at a speed set by a speed setting device 16.

The weft thread guide member 9 has, for example, an L-shape, and is connected to a shaft of a rotary driver 17 provided on the same axis as the shaft of the horizontal rotating roller 10.
The contact length of the weft yarn 3 with respect to the outer peripheral surface of the rotating roller 10 is changed by rotating the drive amplifier 18 counterclockwise from the standby position in FIG. Therefore, the rotational force of the rotary roller 10 acts as a traction force in the weft insertion direction on the weft yarn 3 according to the contact length. The rotary driver 17 is configured by a servomotor, but is not limited thereto, and may be configured by a pulse motor, a rotary actuator, or the like.

At the time of weft insertion, the locking pin 8 is
The weft 3 having the number of turns required for weft insertion of one pick is unwound on the outer peripheral surface of the drum 7 by retreating from the outer peripheral surface of the drum 7. At the same time, the weft insertion nozzle 11 injects the weft insertion fluid in the flight direction of the weft 3 so that the weft 3 along with the jetting fluid along the groove of the reed 19 along the weft flight path. Insert in the direction.

During the weft insertion period, the driving device 17 rotates the weft 3 against the outer peripheral surface of the rotating roller 10 by rotating the weft 3 counterclockwise by a preset reference rotation angle in FIG. Contact is made with a predetermined contact length. For this reason,
During the weft insertion period, the weft yarn 3 receives the rotational force in the weft insertion direction from the rotating roller 10 in a frictional manner, and
And is urged in the weft insertion direction.

At the time of weft insertion, the weft arrival detector 20
The detection end 201 detects the arrival timing of the weft yarn 3 at the weft flight path, that is, at or at the final arrival position, and sends it to one input end of the comparator 21. The comparator 21 takes in the target arrival timing set in advance by the target setting unit 22 from the other input terminal, compares the two at the comparison timing, and generates a signal of the arrival timing difference as a comparison result. Is sent to the deviation calculator 25. Here, the deviation calculator 25 calculates a deviation according to the arrival timing difference, and calculates the deviation as a manipulated variable calculator 26.
Send to

The operation amount calculator 26 calculates an operation amount necessary to regulate the rotation angle of the driver 17 of the weft thread guide member 9 in accordance with the deviation, that is, the difference in the arrival timing, and calculates the operation amount of the drive amplifier 18. Input. On the other hand, the operation timing setter 27 detects the rotation angle of the main shaft 23 of the loom, and drives the rotary driver 17 by the drive amplifier 18 from the start to the end of the operation, so that the weft thread guide member 9 is rotated. Is rotated counterclockwise by a rotation angle corresponding to the deviation amount in a direction to eliminate the difference in the arrival timing, that is, the deviation. The start timing set in the operation timing setter 27 is a weft insertion start timing, that is, a timing at which the locking pin 8 retreats, and an end timing is a timing at which the locking pin 8 advances. The rotation detector 24 is connected to the main shaft 23 of the loom, and is connected to an operation timing setter 27 to be described later in addition to the comparator 21 and the target setter 22, and the timing at which the operation is to be performed on them. Is given.

As a result, the contact length of the weft thread 3 with the rotating roller 10 is adjusted according to the difference in arrival timing, that is, the deviation. Of course, since the control system operates in a direction to eliminate the deviation, when the detected actual arrival timing is later than the target arrival timing,
The contact length is adjusted in a direction that increases from the reference length, that is, beyond the position of the reference rotation angle, and conversely, when the actual arrival timing is earlier than the target arrival timing, the contact length decreases below the reference length. Direction, that is, a direction that does not exceed the position of the reference rotation angle. As described above, the control device 2 detects the arrival timing of the weft yarn 3, compares the arrival timing with the target arrival timing, and changes the rotation angle of the driver 17 of the weft yarn guide member 9 according to the deviation. Therefore, it works in the direction of eliminating the deviation.

[0015]

In the above embodiment, only the contact length is changed so that the arrival timing becomes the target value.
It may be combined with zero rotation speed or traction period. In detail, an upper limit value and a lower decrease value are set for the rotation angle (contact length) of the driver 17, and the rotation angle to be changed is
Even if the upper limit value or the lowering value is reached, if the deviation of the arrival timing still remains, the control device 2
By changing the rotation speed or the traction period of the rotation roller 10, the function is performed in a direction to eliminate the deviation. For example, when the actual arrival timing is still later than the target arrival timing even when the weft thread guide member 9 reaches the upper limit rotation angle, the operation amount calculator 26 determines the rotation speed set by the speed setting device 15. Either the direction is increased, or the traction period set by the operation timing setting unit 27 is increased, or both the rotation speed and the traction period are changed. When changing the direction of increasing the towing period, the end timing of the towing is delayed or the start timing is advanced. As a result, the direction in which the traction force of the weft yarn 3 received from the rotating roller 10 is increased is changed, so that the deviation is automatically adjusted in a direction in which the deviation is eliminated even by changing the rotation speed or the traction period.

[0016]

FIGS. 4, 5, and 6 show other examples of mounting a movable yarn guide, that is, a weft guiding member 9. FIG. In FIGS. 4 and 5, the weft thread guide member 9 is mounted so as to rotate in a direction orthogonal to the weft thread travel path.
The contact length of the weft yarn 3 with respect to is changed. FIG. 6 shows an example in which the contact length of the weft thread 3 with respect to the rotating roller 10 is changed by changing the amount of advance of the weft thread guiding member 9 with respect to the rotating roller 10 using a pair of weft thread guiding members 9. . At this time, the driving device 17 includes a motor 28, a rack 29 driven by the motor 28,
It is constituted by a pinion 30.

[0017]

According to the present invention, since the weft thread pulling force is changed by changing the contact length of the weft thread to the rotating roller, the responsiveness is better than when only the rotating speed of the rotating roller is changed. Unlike the case where the gap between the rotating rollers is changed, since the contact length is simply changed, the weft is not seriously damaged. This makes it possible to control the weft arrival timing while ensuring stable weft insertion.

Further, when the adjustment by the contact length reaches the limit, if at least one of the rotation speed of the rotating roller and the weft pulling period by the rotating roller is changed in the direction of eliminating the deviation, the control adjustment range is expanded. Appropriate response to a large disturbance is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of an apparatus for implementing a weft insertion control method of the present invention.

FIG. 2 is an enlarged side view of a portion for changing a contact length of a weft thread to a rotating roller.

FIG. 3 is an enlarged front view of a portion for changing a contact length of a weft thread to a rotating roller.

FIG. 4 is an enlarged side view of a portion for changing a contact length of a weft thread to a rotating roller.

FIG. 5 is an enlarged front view of a portion for changing a contact length of a weft thread to a rotating roller.

FIG. 6 is an enlarged side view of a portion that changes a contact length of a weft thread to a rotating roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact-type weft pulling device 2 Control device 3 Weft 5 Length measuring storage device 9 Weft guide member 10 Rotary roller 11 Weft insertion nozzle 17 Driver 20 Weft arrival detector 21 Comparator 25 Deviation calculator 26 Operation amount calculator

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D03D 47/34 D03D 47/36 B65H 51/30 B65H 59/38

Claims (2)

(57) [Claims] A weft thread is provided between a length measuring storage device and a weft insertion nozzle, and the weft thread is brought into contact with a peripheral surface of the rotating roller rotating the weft thread by a weft thread guide member at a weft insertion time. In a contact type weft pulling device that pulls in the insertion direction, the arrival timing of the weft yarn is detected along the weft flight path, the detected arrival timing is compared with the arrival timing of the target, and the deviation as a comparison result is eliminated. By changing the contact length of the weft to the rotating roller,
A weft insertion control method, characterized in that the actual arrival timing of the weft yarn is brought closer to the target arrival timing. 2. A weft thread is provided between a length measuring storage device and a weft insertion nozzle, and at the time of weft insertion, the weft thread is brought into contact with the peripheral surface of the rotating roller rotating the weft thread by a weft thread guide member. In a contact type weft pulling device that pulls in the insertion direction, the arrival timing of the weft yarn is detected along the weft flight path, the detected arrival timing is compared with the arrival timing of the target, and the deviation as a comparison result is eliminated. By changing the contact length of the weft to the rotating roller,
In the process of bringing the actual weft arrival timing closer to the target arrival timing, when the adjustment by the contact length reaches the limit, at least one of the rotation speed of the rotating roller and the weft thread pulling period by the rotating roller is set to the deviation elimination direction. A horizontal insertion control method, characterized in that: