JPH04370247A - Weft cutting method - Google Patents

Abstract

PURPOSE:To cut weft connecting from a main nozzle to a weft treating device without using a special-purpose cutter, a guide member, etc. CONSTITUTION:When weft is kept in a state where weft is connected between a main nozzle and a weft-treating device, weft is fed onto a weft-inserting course by jetting a fluid from the main nozzle while retaining the weft on the main nozzle side or weft treating device side and weft is placed in action area of a yarn feeding cutter and the weft is cut by the top of main nozzle.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting defective weft yarns using a yarn feeding cutter in a weft yarn processing device for a fluid jet loom.

0002

[Prior Art] Japanese Patent Laid-Open Nos. 63-256749 and 2-264036 disclose that a weft treatment device is provided between a main nozzle and the end of a woven fabric, and the weft treatment device removes the weft yarn with poor weft insertion. This makes it possible to remove weft knots. In these processing devices, at the start of weft processing, the weft remains connected from the main nozzle to the weft processing device, and is cut by a cutter and then processed.

0003

[Problems with the Prior Art] In the device disclosed in Japanese Patent Application Laid-open No. 2-264036, the weft thread connected from the main nozzle to the weft processing device is cut before removing the defective weft thread or after removing the weft knot. Since the weft processing device is located off the weft insertion path, a dedicated cutter is required near the tip of the main nozzle. Furthermore, in the device disclosed in Japanese Patent Application Laid-Open No. 63-256749, the weft yarn continuous from the main nozzle to the weft yarn processing device is cut using a yarn feeding cutter, but in order to guide the weft yarn close to the yarn feeding cutter, A special guide member is required. In this way, either technique requires a dedicated cutter and a special guide member, and the mechanical components on the weft insertion side become complicated.

0004

[Object of the Invention] Therefore, an object of the present invention is to make it possible to cut the weft yarn leading from the main nozzle to the weft yarn processing device without using a special cutter or special guide member, and to reduce the complexity of the device configuration on the weft insertion side. without making it
It is possible to cut the weft thread.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention has an object of the present invention, when the weft yarn is connected between the main nozzle and the weft yarn processing device, while holding the weft yarn on the main nozzle side or the weft yarn treatment device side, the main nozzle inject fluid from
The weft yarn is fed onto the weft insertion path, the weft yarn is brought into the action area of the yarn feed cutter by moving the yarn feeding cutter back and forth, and the weft yarn is cut at the tip of the main nozzle by the yarn feeding cutter. That's what I do.

[0006] According to this technique, the purpose of cutting the defective weft yarn can be achieved using the existing yarn feeding cutter, so a special cutter is not required to cut the weft yarn, and the yarn feeding cutter is not required. However, since no special guide member is required, the weft insertion device and related mechanical components on the weft insertion side can be simplified.

[0007]

[Embodiment 1] In this embodiment, when the weft yarn 1 is connected between the main nozzle 2 and the weft yarn processing device 3, while holding the weft yarn 1 on the side of the weft yarn treatment device 3,
A new weft yarn 1 is created by jetting fluid from the main nozzle 2.
This is an example in which the weft yarn 1 is supplied onto the weft insertion path, and the position where the weft yarn 1 is to be cut faces the action area of the yarn feeding cutter 4, and corresponds to claim 1 of the claims.

As shown in FIG. 1, the weft yarn 1
For example, the yarn is supplied from a drum and guided to a drum-type length measurement storage device 6, and is wound around the outer peripheral surface of a stationary drum 8 by the rotational movement of a rotating yarn guide 7 while being locked by a locking pin 9, and the length is measured. It is stored until the horizontal insertion point. When the solenoid 10 moves the locking pin 9 backward to unwind the stored weft yarn 1 on the outer peripheral surface of the drum 8 at the weft insertion timing, the main nozzle 2 sprays fluid to unwrap the unwound weft yarn. 1 to warp thread 11 opening 1
I'm going to put it in 2.

The weft yarn 1 in the weft insertion state is recessed by a reed 13 to form a woven fabric 14, which is cut at the end of the woven fabric 14 on the weft insertion side by a yarn feeding cutter 4 on the weft insertion side. The yarn feeding cutter 4 in this embodiment is fixed on the yarn feeding side on the extension line of the front of the weave, and opens at a crank angle of around 0 degrees in conjunction with the crankshaft of the loom (not shown). By closing at an angle of nearly 40 degrees,
Cut the inserted weft thread 1.

[0010] In order to remove defective weft threads 1 such as weft threads 1 that have been inserted incorrectly or weft threads 1 that have knots, a known weft thread processing device 3 is provided on the weft insertion side, and the tip of the main nozzle 2 A blow-up nozzle 16 is partially provided toward the intake port of the guide cylinder 15 of the weft yarn processing device 3.

This weft yarn processing device 3 is, for example, the device described in the above-mentioned Japanese Patent Application Laid-Open No. 2-264036, which draws the defective weft yarn 1 from the guide tube 15 into the device by a suction air flow, and removes the pulled-in weft yarn 1. By winding, the defective weft thread 1 is removed from the opening 12 or the knot of the weft thread 1 is removed from the upstream side of the main nozzle.

FIG. 2 shows the sequence of operation according to the invention. When a weft insertion error occurs during weaving, the condition is detected in the loom cycle in which the weft insertion error occurred, that is, near the crank angle of 290 degrees in the one revolution range of the loom's crankshaft, and a loom stop signal is output. The loom stops at a crank angle of nearly 300 degrees in the next rotation range while rotating inertia.

From the time when the weft insertion error occurs until immediately before the subsequent yarn processing, that is, the removal of the defective weft yarn 1, starts, the blow-up nozzle 16 injects air and
Operate the solenoid 10 to move the locking pin 9 backward,
The weft yarn 1 stored on the drum 8 is disassembled, for example, by one winding, and the weft yarn 1 is displaced at the tip of the main nozzle 2 toward the intake port side of the guide tube 15 of the weft yarn processing device 3, and at the same time, the weft yarn processing device 3 also generates a suction air flow in the intake port to draw in the weft thread 1 in preparation for its removal. Therefore, the weft yarn 1 is curved between the main nozzle 2 and the weft insertion side end of the woven fabric 14, and is out of the weft insertion path. Therefore, even if the reed 13 drives the defective weft yarn 1 to the weaving front and the yarn feeding cutter 4 performs a cutting operation in one rotation range when stopped, the weft yarn 1 will not be cut and will not be cut inside the main nozzle 2. It remains connected to the part where the weft insertion error occurred via the weft processing device 3.

[0014] After this, automatically or by the weaver's reversing operation, the loom is reversed from the 1 rotation range at the time of stop to a crank angle of nearly 200 degrees in the 1 rotation range due to a weft insertion error, and then it is temporarily stopped. By doing this, the defective weft thread 1 is picked out.

[0015] Here, the solenoid 10 is activated by a command from the weaver or the automatic control unit, and by retracting the locking pin 9, the weft yarn 1 stored on the drum 8 is unwound, and the main nozzle 2 By carrying out the injection operation, for example, one turn of new weft yarn 1 is fed onto the weft insertion path and introduced into the opening 12, as can be seen in FIG. After this, as shown by the solid arrow, the loom is driven forward, and when the loom is rotated to a crank angle of nearly 40 degrees in the 1-rotation range when stopped, the loom is newly unraveled by the reel 13 when the crank angle is close to 0 degrees. The weft yarn 1 is beaten close to the front of the cloth and is displaced to the action area of the yarn feeding cutter 4 in the open state. Then, at a crank angle of about 40 degrees, the yarn feed cutter 4 closes, so the new weft yarn 1 is cut at that position and separated from the tip of the main nozzle 2.

[0016] After this, the loom is again reversed to a crank angle of nearly 200 degrees in the rotation range where the weft insertion error occurred.
The warp yarns 11 form openings 12 to facilitate removal of defective weft yarns 1.

Alternatively, after supplying new weft yarn 1,
As shown by the dotted chain arrow, when the loom is reversed and rotated to a crank angle of nearly 20 degrees, which is the one-turn range where weft insertion errors occur, the weft thread 1 newly unwound by the reed 13 is near the front of the weave. and is displaced to the action area of the yarn feed cutter 4 in the open state. After this, the loom is rotated forward to a crank angle of nearly 200 degrees in the same one-rotation range to open the warp yarns 11 and make it easier to remove the defective weft yarns 1. At this time, at a crank angle of nearly 40 degrees, , the yarn feeding cutter 4 closes, and the new weft yarn 1 is cut at that position.
It is separated from the tip of the main nozzle 2. The weft yarn processing device 3 pulls in the weft yarn 1 guided inside by winding or the like, thereby removing the weft yarn 1 that has been inserted incorrectly.
is removed from the opening 12. After removing the defective weft yarn 1, the loom is reversed to a crank angle of nearly 300 degrees in one rotation region before the one rotation region of the weft insertion error, and restarted from that position.

The operation of the weft yarn processing device 3 when winding up the weft yarn 1 from the upstream side of the main nozzle to remove knots will be described.

When the weft yarn 1 of the yarn supply body 5 is consumed and the weft yarn 1 is automatically pulled out from the spare yarn supply body 5 via the transfer tail, the loom is stopped. After the loom is stopped, the tip of the weft yarn 1 from the main nozzle 2 is guided to the weft treatment device 3 by the guide nozzle 19. Then, the weft thread processing device 3 operates and winds up the knot together with the weft thread 1 on the length measurement and storage device side. When winding is completed, the weft 1 is transferred from the main nozzle 2 to the weft processing device 3.
are in a continuous state. Thereafter, the loom is reversed to open the warp yarn 11, and the weft yarn 1 is held by the weft yarn processing device 3, while a new weft yarn 1 is opened by the main nozzle 2.
is supplied into the opening 12. At this time, after a new weft yarn 1 is once pulled out from the yarn supplying body 5 and stored by the length measuring storage device, the locking pin 9 is moved back to unwind a predetermined number of turns of the weft yarn 1. After supplying a new weft yarn 1, the loom is rotated forward or reverse to the same crank angle as in the above embodiment, and the weft yarn 1 is guided by the reed 13 to the action area of the yarn feeding cutter 4 and cut.

In the above embodiment, the yarn feed cutter 4 was mechanically linked to the crankshaft of the loom, but instead of such a yarn feed cutter 4, a solenoid or the like may be used to drive the yarn feed cutter 4. The cutting operation may be performed regardless of the crank angle of the loom. At this time, the loom may be rotated forward or reverse to a crank angle that allows the reed 13 to guide the newly unwound weft yarn 1 to the action area of the yarn feeding cutter 4.

[0021]

[Embodiment 2] In this embodiment, when the weft yarn 1 is connected between the main nozzle 2 and the weft yarn processing device 3, the weft yarn 1 is held on the upstream side of the main nozzle 2 by, for example, a pair of clampers 17. In this example, fluid is injected from the main nozzle 2 to displace the weft yarn 1 connected to the main nozzle 2 and the weft yarn processing device 3 onto the weft insertion path, and the movable yarn feeding cutter 4 cuts the weft yarn. This corresponds to claim 2 of the claims. Note that instead of using the pair of clampers 17, the weft thread 1 may be held by moving the locking pin 9 forward.

As shown in FIG. 4, the weft yarn processing device 3 in this embodiment is a device for preventing the weft yarn 1 from entering the weft into the opening 12, for example, and is a device for preventing the weft from entering the weft, and is connected to the main nozzle 2. A suction tube 18 and a guide nozzle 19 are provided between the ends of the woven fabric 14. Further, a pair of clampers 17 are provided upstream of the main nozzle 2, one of which can be controlled to open and close by a solenoid 20.

[0023] When a weft insertion failure occurs, the weft processing device 3
When a command is given to prevent horizontal insertion in one rotation range when stopped, the suction tube 18 starts suction operation, and the guide nozzle 19 injects air toward the suction tube 18 to prevent the main An air flow is generated at the tip of the nozzle 2 in a direction that intersects with the insertion direction. Therefore, even if the main nozzle 2 tries to inject the unwound weft yarn 1 at the weft insertion timing, the weft yarn 1 will be ejected from the guide nozzle 1.
9 into the suction tube 18, the suction tube 1
It is pulled into the inside of 8 and is not put aside. In this way, one pick of weft thread 1 is drawn into the interior of the suction tube 18 and held there by the air flow. When one pick of weft yarn 1 is unwound from the drum 8, the locking pin 9 is moved forward. Note that the defective weft yarn 1 is beaten and cut by the yarn feeding cutter 4 before the loom stops.

After the loom has stopped, the solenoid 20 is activated to close the pair of clampers 17, thereby holding the weft yarn 1 upstream of the main nozzle 2. therefore,
In this state, the weft yarn 1 comes out from the tip of the main nozzle 2 and enters the inside of the suction tube 18 in the shortest distance.

In this state, after the loom is reversed to a crank angle of 200 degrees in the range of one rotation due to a weft insertion error, or when the loom is stopped at a crank angle of 300 degrees in the range of one rotation without reversing the loom, the guide nozzle 19 The injection of the main nozzle 2 is stopped, the suction force of the suction tube 18 is weakened or stopped, and the main nozzle 2 is operated with a weak injection force. Since a sufficient length of the weft yarn 1 is suctioned into the suction tube 18, the suction tube 18
The weft threads 1 are pulled out from the suction pipe 18 while remaining connected between the main nozzle 2 and the suction pipe 18, and the warp threads 1 are in an open state or a closed state as shown by the two-dot chain line.
1 and lies in front of the action area of the movable yarn feeding cutter 4.

Thereafter, the yarn feeding cutter 4 is moved from the retreat position to the position where the weft yarn 1 lies by a moving means 21 such as an air cylinder, and after exposing the weft yarn 1 to the working area, it is driven by the solenoid 20 to cut it. perform an action. As a result, the weft yarn 1 extending from the inside of the main nozzle 2 to the suction pipe 18 of the weft yarn processing device 3 is cut by the yarn feeding cutter 4 in the forward state. Thereafter, the weft yarn processing device 3 generates an air flow in the drawing direction inside the suction tube 18 to draw the cut weft yarn 1 inside and discharge it to a predetermined position.

[0027]

[Other Examples] Embodiments 1 and 2 have different configuration items and operation orders to express different operation modes. They can be replaced as long as there is no conflict between them.

[0028]

Effects of the Invention In the present invention, when the weft is connected from the main nozzle to the weft processing device, the jetting operation of the main nozzle is started while the weft is held by the main nozzle or the weft processing device. , the weft is supplied from the weft processing device side or the main nozzle side onto the weft insertion path, where it can be cut by the yarn feeding cutter, so a dedicated yarn feeding cutter is not required for yarn processing, and the existing The yarn feeding cutter can be used as is, and even when using the yarn feeding cutter, no special guide member is required, and the configuration can be simplified.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an apparatus for carrying out the weft thread cutting method of Example 1.

FIG. 2 is a time chart during operation of the first embodiment.

FIG. 3 is an explanatory diagram when cutting the weft thread.

FIG. 4 is an explanatory diagram of an apparatus for implementing the weft thread cutting method of Example 2.

[Explanation of symbols]

1 Weft thread 2 Main nozzle 3 Weft processing device 4 Yarn feeding cutter 9 Locking pin 17 Clamper

Claims (2)

[Claims] Claim 1: In a weft yarn processing device that is provided between a main nozzle and an end of a woven fabric and processes a weft yarn connected to the main nozzle, the weft yarn is connected between the main nozzle and the weft yarn treatment device. At this time, while holding the weft yarn on the weft yarn processing device side, a fluid is injected from the main nozzle to supply a new weft yarn onto the weft insertion path, and the supplied weft yarn faces the action area of the yarn feeding cutter, and the yarn feeding A weft thread cutting method characterized by cutting with a cutter. [Claim 2] A weft processing device that is provided between a main nozzle and an end of a woven fabric and processes a weft thread connected to the main nozzle. Let it spray,
A weft thread cutting method characterized by displacing a weft thread connected from a main nozzle to a weft thread processing device onto a weft insertion path, making the displaced weft thread face an action area of a thread feeding cutter, and cutting the weft thread by the thread feeding cutter.