JPH05321080A - Method for discharging wrapped yarn - Google Patents

Abstract

PURPOSE:To surely discharge wrapped yarn by taking weft yarn connecting to a picking nozzle from a drum type device for measuring the length and storing into a suction pipe when yarn breakage occurs between a yarn feed unit and the device for measuring the length and storing, then retreating an engaging pin and taking off the wrapped yarn on the drum into the suction pipe. CONSTITUTION:In an air jet loom equipped with a double type picking device for feeding weft yarns 2 and 3 from two yarn feed units 8 and 9 through drum type devices 10 and 11 for measuring the length and storing to picking main nozzles 6 and 7, the weft yarn connecting from a rotating yarn guide 12 to the nozzle 6 is delivered to a suction pipe 32 for discharge by the guide operation of a yarn guide 36 when a yarn sensor 25 senses the yarn breakage between the yarn feed unit 8 and the device 10 for measuring the length and storing in a process for picking, e.g. the weft yarn 2. The engaging pin 20 of the device 10 for measuring the length and storing is then retreated to release the restriction of the wrapped yarn on the drum 18. The wrapped yarn is simultaneously sucked into the suction pipe 32 and discharged from the outer periphery on the drum 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention automatically removes the weft yarn remaining on the drum of the length measuring and storing device when a yarn breakage occurs between the weft feeder and the drum type length measuring and storing device. Regarding the method of discharging.

[0002]

2. Description of the Related Art Generally, when a yarn breakage occurs between a yarn feeder and a drum type length measuring and accumulating device, a fluid is jetted from a weft insertion nozzle to remain on the drum of the length measuring and storing device. The weft thread is being discharged. In this case, since the discharged weft thread is easily clogged at the weft insertion nozzle, a reliable discharging operation cannot be performed. That is, the end of the weft yarn on the cutting side jumps out from the inside of the rotary yarn guide of the length-measuring storage device to the drum side, where it tends to become entangled with the weft yarn in the stored state, so when the weft insertion nozzle is jetted in this state, When the weft yarns in the stored state are entangled, the weft yarns are unwound at one time and cannot pass through the weft insertion nozzle, so that the discharging operation cannot be performed.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a winding state which remains on the drum of the length-measuring device when a yarn breakage occurs between the weft yarn feeder and the drum-type length-measuring device. This is to ensure that the weft thread can be discharged.

[0004]

SUMMARY OF THE INVENTION With the above object, the present invention provides a suction tube, and by guide movement of a yarn guide near the suction tube, or by an air flow in the suction direction by the suction tube,
The weft thread wound on the drum is guided into the suction tube and discharged through the suction tube to the outside.

[0005]

[Embodiment 1] FIGS. 1 to 4 show a weft insertion device 1 for carrying out a wound yarn discharging method according to a first embodiment of the present invention. This weft-loading device 1 is an example in which two-color weft-loading devices, that is, two weft yarns 2 and 3 are weft-loaded by auxiliary main nozzles 4 and 5 and main nozzles 6 and 7 as double weft-loading nozzles.

The respective weft threads 2 and 3 are yarn feeders 8 and 9.
1 and a drum-type length measuring and storing device 1 arranged in an up-and-down position via the yarn guiding tubes 14 and 15 having a threading function.
It is drawn inside the 0, 11 rotating yarn guides 12, 13. The rotating yarn guides 12 and 13 are rotated by the drive motors 16 and 17, and the weft yarns 2 and 3 are wound around the fixed drums 18 and 19 at a predetermined speed to measure the length. During measurement, the locking pins 20, 21
Moves to the outer peripheral surfaces of the drums 18 and 19 by the operating devices 22 and 23, and locks the weft threads 2 and 3.

The weft threads 2, 3 on the downstream side of the drums 18, 19
Pass through the inside of the auxiliary main nozzles 4 and 5, respectively, and reach the main nozzles 6 and 7. The main nozzles 6 and 7 are fixed to a sley (not shown) in the weft insertion direction, but the auxiliary main nozzles 4 and 5 are both supported by a common support shaft 28 provided on the frame 27. They are provided in a vertically positional relationship so as to be rotatable about a vertical axis by 29 and 30, and are displaced by a required angle in a predetermined direction by an appropriate operating means such as an air cylinder 31 for threading and thread discharging. Will be installed in different positions.

At the weft insertion timing, one of the length measurement storage devices 10 and 11, for example, the operation device 22 of the length measurement storage device 10
When the locking pin 20 is retracted for weft insertion of the weft thread 2, the weft thread 2 in the stored state is unwound at the drum 18, and the weft insertion state is set. At this time, since the fluid for weft insertion is supplied to the auxiliary main nozzle 4 and the main nozzle 6, the main nozzle 6 ejects the fluid for weft insertion into the opening 24 of the warp yarn, and together with this jet flow. The weft thread 2 is inserted into the opening 24.

When a yarn breakage occurs between the yarn feeders 8 and 9 and the measuring and storing devices 10 and 11 during such weft insertion,
The yarn sensors 25 and 26 provided in the yarn path between them detect the absence of the corresponding weft yarns 2 and 3 to detect the yarn breakage state and generate a yarn breakage signal. For example, assume that the weft thread 2 is broken. At this time, the control system of the loom (not shown) receives the thread break signal from the thread sensor 25 and immediately stops the loom. In this state, the weft thread 2 between the yarn feeder 8 and the rotary yarn guide 12 is in a discontinuous state, but the weft thread 2 inside the rotary yarn guide 12 is locked by the locking pin 20. It is wound around the outer circumference of the drum 18 and remains connected to the auxiliary main nozzle 4 and the main nozzle 6.

Thereafter, the suction pipe 30 is driven by an air cylinder (not shown) or the like, horizontally moves from a standby position shown by imaginary lines in FIGS. 2 and 3 to an operating position shown by solid lines, and is measured by a trumpet-shaped suction guide 34. It faces the long storage devices 10 and 11 and is set at an intermediate position between the two auxiliary main nozzles 4 and 5. The standby position is the rotating yarn guides 12, 1
3 is a position for receiving the weft yarns 2 and 3 and the operating position is a position for sucking the weft yarns 2 and 3 guided by the yarn guides 36 and 37 described later. V-shaped notches 38 and 3 are formed above and below the opening-side end surface of the trumpet-shaped suction guide 34.
9 is formed, and cutters 40, 41 which are operated by a cylinder 42 are attached to the back side thereof.

Here, the suction pipe 32 generates an air flow in the drawing direction. After this, the air cylinder 31 operates,
Both of the two auxiliary main nozzles 4 and 5 are rotated by a predetermined angle, and as shown by the imaginary lines in FIGS. As a result, as shown in FIG. 2, the continuous weft yarns 2 are guided on the movement path of the yarn guide 36. In this state, the continuous injection of the auxiliary main nozzle 4 and the main nozzle 6 is stopped.

The two thread guides 36, 37 are respectively connected by rotary solenoids 44, 45 and columns 43.
It is rotatably installed around a substantially horizontal shaft, and has fork-shaped holding portions 46 and 47 formed at its tip portion, and V-shaped yarn guides 48 and 49 are provided at its tip portion. Here, the upper yarn guide 36 is rotated as shown in FIG. 4, so that the holding portion 46 and the yarn guide 48 at the tip end are rotated.
Locks the weft thread 2 from the auxiliary main nozzle 4 to the holding section 4
The weft thread 2 continuous with 6 is guided inside the notches 38 and 39 of the suction guide 34 of the suction tube 32. At this time, the weft thread 2 is pulled back from the main nozzle 6 side. afterwards,
The weft yarn 2 in the auxiliary main nozzle 4 and the main nozzle 6 is drawn into the suction pipe 32 by the air flow in the suction pipe 32 in the drawing direction.

After this, the suction pipe 32 returns to the standby position. When the locking pin 20 is retracted in this state, the weft yarn 2 wound around the outer peripheral surface of the drum 18 is unwound by the suction force of the suction pipe 32, so that the air flow in the drawing direction inside the suction pipe 32 is released. Therefore, the unwound weft 2 is
It enters the inside of the suction guide 34, is drawn into the inside of the suction pipe 32 together with the weft thread 2 inside the main nozzle 6, and is discharged to a predetermined position. In addition, the weft thread 2 uses the suction guide 34.
When guided into the notches 38, 39 of the nozzle, the cutter 40 is actuated to cut the weft yarn 2 and the weft yarn 2 inside the nozzle is wefted by jetting fluid from the auxiliary main nozzle 4 and the main nozzle 6. It may be discharged in the inserting direction.

Even at this standby position, the suction tube 32 continues the suction operation for the next threading operation. In addition, the auxiliary main nozzles 4 and 5 rotate back to their original positions and return. The yarn guide 36 also rotates to return to the original position. On the other hand, the auxiliary main nozzle 4 and the main nozzle 6
Always starts injection. Then, after a predetermined time, for example, about 5 seconds has elapsed after the locking pin 20 retracts, the locking pin 20 is driven again by the operation device 22 to advance to the outer peripheral surface of the drum 18, and the weft thread 2 is locked. Prepare for In this way, the wound yarn is discharged.

Next, the threading operation for the weft thread 2 is started. The rotating yarn guide 12 of the length measurement storage device 10 rotates and stops at a position facing the suction pipe 32 at the standby position. The cutting side end of the weft thread 2 of the thread breaker 8 is drawn into the thread guide tube 14 by a threading jet nozzle 50, passes through the inside of the rotary yarn guide 12 and jumps out to the outside. Is guided to the inside of the suction pipe 32. The weft yarn 2 is guided from the rotary yarn guide 12 to the suction pipe 32 by the cooperation of the jet air flow from the rotary yarn guide 12 and the air flow in the drawing direction into the suction pipe 32. It is done by running.

In this case, a semi-circular arc is formed on the front side of the suction pipe 32.
Since a trumpet-shaped auxiliary suction guide 52 is provided and surrounds the periphery of the suction guide 34, the weft yarn 2 in a flying state
Is guided to the vicinity of the inlet side of the suction tube 32, the air flow in the suction direction formed there ensures that the suction tube 32 is delivered to the inside of the suction tube 32. Therefore, the weft yarn 2 in the flying state is delivered more reliably. The auxiliary suction guide 52 is fixed to the frame 27 of the loom, and is opened on the moving direction side to allow the suction pipe 32 to move. In addition, the auxiliary suction guide 52
Sucks the weft yarn 2 wound around the drum 18 into the suction pipe 32.
It also has a function of preventing the weft thread 2 from being entangled with the suction guide 34 when it is pulled inside.

Thereafter, the threading jet nozzle 50 is stopped, the suction pipe 32 is moved to the operating position, and the suction operation is continued. The rotating yarn guide 12 rotates several times,
Wrap the weft thread 2. In this state, the lower thread guide 3
7 rotates from the standby position to lock the weft thread 2 and guide it to the position of the auxiliary main nozzle 4. Even during this time, the auxiliary main nozzle 4 and the main nozzle 6 continue to inject at all times by using the conduit bypassing the conduit for passing the weft insertion fluid, but when the weft yarn 2 is guided by the yarn guide 37. In addition to the constant injection, a fluid having a flow rate smaller than that at the time of wetting is jetted from a conduit through which the fluid for wetting is passed. In this state, the cutter 40 operates to cut the weft yarn 2 inside the notch 38. At this time, the tip of the weft thread 2 is once passed through the auxiliary main nozzle 4. After that, the locking pin 20 retracts and unwinds the wound yarn of the drum 18, and the yarn is drawn into the main nozzle 6. After that, the rotary yarn guide 12 is rotated to carry out preliminary winding and prepare for the next weft insertion.

After this, the suction pipe 32 returns to the standby position,
Further, the thread guide 36 moves to the standby position where it does not hinder the weft insertion. In this way, the threading operation is completed. Although the above description relates to one weft thread 2, the same applies to the other weft thread 3.

[0019]

[Embodiment 2] Next, in Embodiment 2 of FIG. 5, weft insertion for one color is performed by one main nozzle 6, and a thread guide 53 for discharging is separately installed in addition to the thread guide 36 for threading. In this example, the suction pipe 32 is also used for thread discharge and threading as in the above embodiment. When a yarn break occurs between the yarn feeder 8 and the length measuring and storage device 10, the loom automatically stops in the same manner as described above. After that, the discharge yarn guide 53 advances by a cylinder (not shown) or the like, locks the weft yarn 2 connected to the main nozzle 6 from the rotary yarn guide 12, and guides it to the suction guide 34 on the inlet side of the suction pipe 32. .. Here, the suction pipe 32 starts the suction operation and sucks the guided weft thread 2 inside. After this, the yarn guide 53 retracts.

As in the first embodiment, the suction tube 32 is provided so as to be movable back and forth, and after the weft thread 2 is passed through the suction tube 32,
If the locking pin 20 is retracted after retracting from the advanced position shown in FIG. 5 and separating from the yarn guides 36, 53 and the main nozzle 6, the weft yarn 2 does not interfere with those members during suction. A more reliable discharge operation can be performed.

When the locking pin 20 is retracted and the weft yarn 2 wound around the drum 18 is unwound, the unwound weft yarn 2 is drawn into the suction tube 32. In this way, the weft thread 2 remaining on the drum 18
Is discharged to the outside by the suction action of the suction pipe 32. At this time, since the main nozzle 6 constantly stops jetting, the weft yarn 2 inside the main nozzle 6 is also pulled out from the rear end and similarly discharged.

After this, threading is performed in the same manner as described above.
That is, after facing the suction tube 32, the rotating yarn guide 1
The weft yarn 2 inside 2 enters the inside of the suction pipe 32 from the rotary yarn guide 12 by the jet air flow inside and the air flow in the drawing direction of the suction pipe 32, and is in a tensioned state between them. After that, the thread guide 36 is rotated, and the suction tube 32 is rotated.
Hold the weft thread 2 near to and guide it to near the main nozzle 6. In this state, when the cutter 41 is operated and the main nozzle 6 starts jetting, the guided weft thread 2 is
It is drawn into the main nozzle 6 and is in a threading state.

[0023]

[Other Embodiments] In the second embodiment, instead of the discharging thread guide 53, the suction tube 32 itself can be moved, and the movement of the suction tube 32 directly guides the weft thread 2 to the inside. You can also That is, when the weft yarn 2 in the wound state is discharged, the suction port is brought closer to the weft yarn 2 connected to the main nozzle 6 from the locking pin 20. For example, the suction port is brought close to the inlet of the main nozzle 6, and the locking pin 2
Alternatively, the weft thread 2 connected to the main nozzle 6 from 0 may be directly taken in. Then, the weft thread 2 may be sucked and discharged by returning to the standby position and retracting the locking pin 20.

[0024]

According to the present invention, at the time of yarn breakage between the weft yarn feeder and the drum type length measuring and accumulating device, the weft yarn connected to the weft inserting nozzle is taken into the discharge suction pipe from the length measuring and storing device, Since the weft thread wound on the drum for length measurement storage is sucked in, even if the weft thread wound on the drum is unwound at one time, the discharge path will not be clogged and the discharge operation will be reliable. You can do it. This makes it possible to automate the processes from the discharge of the weft thread to the threading operation.

[Brief description of drawings]

FIG. 1 is a schematic side view of a weft insertion device for applying the wound yarn discharging method of the present invention.

FIG. 2 is a front view of a suction tube, an auxiliary main nozzle, a thread guide, and the like as seen from the suction port side of the suction tube.

FIG. 3 is a plan view of a mounted state of a thread guide, a suction tube, an auxiliary main nozzle, and the like.

FIG. 4 is a side view of the weft yarn discharging operation.

FIG. 5 is a side view of a main part of another embodiment.

[Explanation of symbols]

 1 Weft Inserting Device 2 Weft Thread 3 Weft Thread 4 Auxiliary Main Nozzle 5 Auxiliary Main Nozzle 6 Main Nozzle 7 Main Nozzle 8 Yarn Feeder 9 Yarn Feeder 10 Length Measuring Storage Device 11 Length Measuring Storage Device 12 Rotating Yarn Guide 13 Rotating Yarn Guide 18 Drum 19 Drum 20 Locking Pin 21 Locking Pin 25 Thread Sensor 26 Thread Sensor 32 Suction Tube 34 Suction Guide 36 Thread Guide 37 Thread Guide 53 Thread Guide for Ejection

Claims (2)

[Claims] 1. A yarn sensor detects a yarn breakage between a weft yarn feeder and a drum type length measuring and accumulating device, and when the yarn breakage occurs, the rotary yarn guide of the length measuring and accumulating device is connected to the weft insertion nozzle. After passing the weft thread to the suction tube by the guide movement of the thread guide, the weft thread remaining on the drum is released by retracting the locking pin of the length measuring and storage device, and the unwound weft thread inside the suction tube is released. A method for discharging a wound yarn, wherein the weft yarn on the drum is discharged by sucking it by an air flow in the drawing direction. 2. A yarn sensor detects a yarn breakage between a weft feeder and a drum type length measuring and accumulating device, and when the yarn breakage occurs, the rotary yarn guide of the length measuring and accumulating device is connected to the weft insertion nozzle. After passing the weft yarn to the suction pipe by the air flow in the drawing direction of the suction pipe that is accessible to the weft yarn, the locking pin of the length measuring storage device is retracted to release the weft yarn remaining on the drum and release it. A wound yarn discharge method, characterized in that the weft yarn in the unwound state is sucked into the inside of the suction pipe by an air flow in the drawing direction and the weft yarn on the drum is discharged.