JPH0679778U - Weft thread brake / pullback operating device - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable an electrically controllable weft brake / pullback device to be easily controlled by an electrical signal. [Structure] After the yarn is processed due to a defective weft yarn and the like, an AND condition is set between the stop signal of the loom and an external signal when threading the length measuring and storing device, the weft yarn brake / pullback device, and the weft insertion nozzle. The external signal is used to control the operation / non-operation state of the weft thread brake / pullback device in conjunction with the stop state of the loom.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion device, and more particularly to improvement of an operating portion for setting a weft brake / pullback device to a non-operating state by electrical control during weft threading.

[0002]

[Prior art]

 In a fluid jet loom or the like, before the weft insertion starts, the weft thread brake / pullback device applies a braking force to the weft thread during the period from the brake start timing, or from the pull-back start timing slightly later than that to the start of the weft insertion. The pullback force is applied to stabilize the weft insertion.

This weft thread brake / pullback device sets the weft thread to the pullback state while the machine base is stopped. For this reason, the weft yarn is in a bent state at the retracted position. Therefore, when repairing the weft thread, for example, when replacing the weft thread or threading the weft thread due to thread breakage, thread the thread through the section from the length measuring and storage device to the weft insertion nozzle via the weft thread brake / pullback device. Work becomes difficult.

On the other hand, Japanese Patent Laid-Open No. 53-38749 discloses a device for pulling a weft thread from a weft storage tube through a gripping device to a weft insertion nozzle. It discloses setting to a possible state. In the device, the gripper corresponds to a weft thread brake / pullback device, but since the opening / closing control is performed by mechanical means and the threading is performed by fluid, the above technique is applied to the present invention. It cannot be applied as it is to the weft brake / pullback device that is subject to.

[0005]

[The purpose of the device]

 Therefore, an object of the present invention is to enable an electrically controllable weft thread brake / pullback device to be easily controlled by electrical signals.

[0006]

[Solution of the device]

 Based on the above-mentioned object, the present invention, after the yarn is processed due to a defective weft, etc., when the yarn lengthening storage device, the weft yarn brake / pullback device, and the threading to the weft insertion nozzle, the stop signal of the loom and an external signal are generated. By taking an AND condition between them, the external signal is used to control the operation / non-operation state of the weft brake / pullback device in conjunction with the stop state of the loom.

[0007]

【Example】

 FIG. 1 shows the construction of an operating device 1 for weft brake / pull back according to the present invention. This operating device 1 is premised on the weft insertion device 2. The weft inserting device 2 is provided with a length measuring storage device 3, a weft yarn brake / pullback device 4 and a weft inserting nozzle 5.

The length-measuring storage device 3 is, for example, a drum-type storage device. The length-measuring storage device 3 pulls out the weft yarn 7 from the yarn supplying body 6, and the rotary motion of the rotary yarn guide 9 driven by the drive motor 8 causes the storage of the stationary state. The weft thread 7 is wound around the outer circumference of the drum 10, and the length is measured and stored. On the outer peripheral surface of the storage drum 10, the weft yarn 7 in a wound state is locked by a locking pin 12 operated by a spring return type solenoid 11, and is unwound at the time of weft insertion. The rotation of the drive motor 8 is controlled by the drive unit 14 and the control unit 15 inside the control device 13, and the solenoid 11 is synchronized by the control unit 15 with the weft insertion operation. The movement is controlled.

Next, as shown in FIG. 2 in addition to FIG. 1, the weft brake / pullback device 4 includes two fixed guides 16, a U-shaped movable guide 17, and an electric device for operating the movable guide 17. It is assembled by a controllable actuator 18. The weft thread 7 is placed on the two fixed guides 16 and is passed between the two fixed guides 16 so as to pass through the inside of the U-shaped portion of the movable guide 17.

As shown in FIG. 3, when a drive signal of “H” level having a height shown by a solid line or a broken line is input to the actuator 18, the movable guide 17 is at the upper position, so that the weft thread 7 is , Almost straight, and is not subject to braking or pulling back force. However, when the “H” level drive signal for the actuator 18 disappears, the actuator 18 rotates clockwise in FIG. 2 and lowers the movable guide 17, so that the weft thread 7 bends as shown in FIG. Since the two fixed guides 16 and one movable guide 17 move while sliding on the outer peripheral surfaces, a predetermined braking force is applied during the weft insertion, and after the weft insertion is completed, the weft insertion nozzle 5 moves backward. You will receive a pullback force in the direction of pullback.

The actuator 18 is operated by a drive device 19. That is, the drive unit 19 is based on the timing signal from the loom controller 22 and generates a control signal in the period from the brake start timing or pullback start timing to before the weft insertion start and the control unit 21 based on this control signal. And a drive unit 20 for driving the actuator 18.

The operating device 1 of the present invention includes a threading control device 23 as a characteristic part. As shown in FIG. 1, the threading control device 23 of this embodiment is assembled by a flip-flop 24 and an AND gate 25. The flip-flop 24 receives an unwinding signal as a threading start signal from the unwinding switch 26 as a set input, and also receives a preliminary winding signal as a threading completion signal from the preliminary winding switch 27 as an input, and sets it from the set time to the reset time. An H "level signal is generated and sent to one input terminal of the AND gate 25.

The AND gate 25 receives the “H” level stop signal from the loom control device 22 while the machine stand is stopped at the other input end, and generates an “H” level AND signal. It is sent to the control unit 21 as an operation command signal. The control unit 21 receives the AND signal of the “H” level as an input, drives the actuator 18, and displaces the movable guide 17 upward, thereby threading the two fixed guides 16 and the movable guide 17 1. The possible space is made straight so that the threading operation is easy. That is, the weft thread 7 is set so that it can be threaded without being bent.

In the length measurement storage device 3, when the locking pin 12 is retracted from the outer peripheral surface of the storage drum 10 in synchronization with the weft insertion timing, the weft thread 7 necessary for one pick weft insertion is unwound. At this time, the weft insertion nozzle 5 jets a weft insertion fluid to insert the unwound weft yarn 7 into the warp yarn opening. For this operation, the control unit 15 receives a timing signal from the loom control device 22, and controls the rotation speed of the drive motor 8 and the drive timing of the solenoid 11 in synchronization with the rotation of the main shaft of the loom.

During the stop, by operating the unwinding switch 26, the locking pin 12 is forcibly retracted, and the weft yarn 7 can be unwound on the outer peripheral surface of the storage drum 10. By operating the switch 27, the locking pin 12 is forcibly inserted into the outer peripheral surface of the storage drum 10 in preparation for the first weft insertion after the stop, and the weft thread 7 having the number of windings necessary for the weft insertion is stored. It is designed to be pre-wound on the drum 10.

During the weft insertion operation, the control unit 21 receives the timing signal from the loom control device 22 as an input and operates the drive unit 20 in a section from the brake start or pullback start timing to immediately before the weft insertion start, and the actuator 18 is operated. By operating the fixed guide 16 and the movable guide 17 to make the weft thread 7 in a bent state, and applying a braking force to the weft thread 7 or by diverting the weft thread 7 to the weft thread 7 at the tip portion of the weft insertion nozzle 5. To pull back.

On the other hand, the loom control device 22 generates a stop signal of “H” level during the stop for operations such as poor weft insertion and thread exchange, and the stop signal of the AND gate 25 of the threading control device 23 sends the stop signal. It is being sent to one input end. Here, when the operator sets the unwinding switch 26 to the ON state and sends the unwinding signal of "H" level to the threading control device 23, the flip-flop 24 is set to "H". A "level signal is generated and sent to one input terminal of the AND gate 25. At this point, since the AND gate 25 inputs the "H" level signal at the two input terminals, it generates an "H" level AND signal, that is, an operation command signal, and sends it to the control unit 21.

Therefore, the control unit 21 drives the actuator 18 via the drive unit 20 and rotates the movable guide 17 in the counterclockwise direction, that is, the returning direction in FIG. 2, thereby fixing the operating portion of the movable guide 17. It is displaced to a position above the guide 16.

Since the remaining weft yarns 7 have already been unwound on the outer peripheral surface of the storage drum 10 by operating the unwinding switch 26, the operator must check the weft yarns 7 of the new yarn feeder 6 or the weft yarns after knotting. 7 is passed through the rotary yarn guide 9, and then the weft thread 7 is passed between the fixed guide 16 on the lower side and the movable guide 17 on the upper side in a linear state, and is guided into the weft insertion nozzle 5. At the time of threading at this time, since the movable guide 17 is positioned above the fixed guide 16, the worker can easily pass the weft thread 7 in that position without bending it, that is, in a straight state. become.

After the completion of the threading, the worker operates the preliminary winding switch 27 to generate a preliminary winding signal, which is sent to the control unit 15 to perform the preliminary winding operation on the length measurement storage device 3. Let it start. The pre-winding signal sets the flip-flop 24 to the reset state, and the AND signal at the “H” level, that is, the operation command signal disappears, so that the driving device 19 stops driving the actuator 18. As a result, the actuator 18 is rotated in the clockwise direction in FIG. 2 by the self-returning force to position the movable guide 17 below the fixed guide 16, and the weft thread 7 after being pulled is bent and the braking force is applied. Or the weft thread 7 is pulled back.

[0021]

[Other Examples]

 In the above-described embodiment, the unwinding signal is used as the threading start signal, but the invention is not limited to this. For example, after the thread breaks, an air injection command signal of the thread guiding device for guiding the weft thread for threading. Alternatively, a thread break signal such as a thread break sensor (not shown) provided between the yarn feeder 6 and the weft insertion nozzle 5 may be used. Further, the threading completion signal is not limited to the pre-winding signal, but the output signal from the sensor that detects that the tip of the weft thread 7 has passed the portion of the weft insertion nozzle 5 and the start preparation switch from the start preparation switch, etc. It can also be done by using signals.

[0022]

[Effect of device]

 According to the present invention, when the loom stops, the weft thread brake / pull-back device is automatically set to the easy threading state according to the AND condition of the stop signal and the threading start signal. It is possible to use various signals that facilitate threading in the part of the pull-back device and that the threading start signal and threading completion signal are generated when the loom is stopped. Since these are not required and those signals are also used for other purposes, it is possible to achieve effective use of the signals and simplification of the control part accompanying them at the same time.

[Brief description of drawings]

FIG. 1 is a block diagram of an operating device for weft brake / pull back.

FIG. 2 is a front view of a main part of a weft thread brake / pullback device.

FIG. 3 is an explanatory diagram of an operation state of the weft thread brake / pullback device.

[Explanation of symbols]

 1 Weft thread brake / pullback operation device 2 Weft insertion device 3 Length measurement storage device 4 Weft thread brake / pullback device 5 Weft insertion nozzle 7 Weft thread 8 Drive motor 10 Storage drum 12 Locking pin 13 Control device 16 Fixed guide 17 Movable guide 18 Actuator 19 Drive device 22 Loom control device 23 Threading control device 24 Flip-flop 25 AND gate

Claims (1)

[Scope of utility model registration request] 1. A locking pin (12) for a length measurement storage device (3).
And a control device (13) for controlling the drive motor (8)
And a drive device (19) for driving a weft thread brake / pullback device (4) provided between the storage drum (10) and the weft insertion nozzle (5) of the length measurement storage device (3). In the device (2), an AND condition is set between the signal from the start to the end of threading input to the control device (13) and the stop signal from the loom control device (22), and the drive device (19) receives the AND condition. An operating device (1) for weft-in brake / pullback, comprising a threading control device (23) for outputting an operation command signal.