JP2922681B2 - Weft cutting 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 cutting a defective weft yarn by a yarn feeder in a weft processing device of a fluid jet loom.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publications Nos. 63-25649 and 2-264036 disclose a weft processing device provided between a main nozzle and an end of a woven fabric. Weft knots can be removed. In these processing devices, at the start of the processing of the weft yarn, the weft yarn remains connected from the main nozzle to the weft yarn processing device, and is processed after being cut by the cutter.

[0003]

2. Description of the Related Art In the apparatus disclosed in Japanese Patent Application Laid-Open No. 2-264036, the weft connected to the weft processing device from the main nozzle is cut before removing the defective weft or after removing the knot of the weft. Since the weft handling device is located off the weft insertion path, a dedicated cutter is needed near the tip of the main nozzle. Further, in the apparatus disclosed in JP-A-63-256649, the weft yarn connected to the weft processing device from the main nozzle is cut by using a yarn feed cutter, but in order to guide the weft yarn near the yarn feed cutter, A special guide member is required. As described above, any technique requires a dedicated cutter and a special guide member, and the mechanical components on the weft insertion side are complicated.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to cut a weft thread from a main nozzle to a weft processing apparatus without using a special cutter or a special guide member, and to complicate the construction of the apparatus on the weft insertion side. Without
The purpose is to enable weft thread cutting.

[0005]

According to the present invention, when a weft yarn is connected between a main nozzle and a weft processing device, the main nozzle holds the weft yarn on the main nozzle side or the weft processing device side. Jet fluid from
The weft yarn is supplied onto the weft insertion path, and the weft yarn is moved to the working area of the yarn feed cutter by moving the weft yarn forward or backward and forward, and the weft yarn is cut by the yarn feed cutter at the tip of the main nozzle. Like that.

According to this technique, the purpose of cutting the defective weft can be achieved by the existing yarn feed cutter, so that a dedicated cutter is not required for cutting the weft, and the yarn feed cutter is used. However, since a special guide member or the like is not required, the weft insertion device and the mechanical components related thereto can be simplified on the weft insertion side.

[0007]

Embodiment 1 In Embodiment 1, when the weft yarn 1 is in a state of being connected between the main nozzle 2 and the weft processing device 3, the weft yarn 1 is held on the side of the weft processing device 3,
Injecting fluid from the main nozzle 2 creates a new weft 1
Is supplied on the weft insertion path, and the position where the weft yarn 1 is to be cut is made to face the action area of the yarn feeding cutter 4, which corresponds to claim 1 of the claims.

[0008] As shown in FIG.
And is guided to, for example, a drum-type length measuring storage device 6, and is wound around the outer peripheral surface of the stationary drum 8 by a rotating pin guide 9 while being locked by a locking pin 9, and is measured by a rotating motion of a rotating yarn guide 7. It is stored up to the time of horizontal insertion. At the weft insertion timing, when the solenoid 10 retreats the locking pin 9 and unwinds the stored weft 1 on the outer peripheral surface of the drum 8, the main nozzle 2 ejects a fluid to cause the unwound weft to be ejected. Opening 1 of warp 11
We put in 2 inside.

The weft yarn 1 in the weft insertion state is beaten by a sheath 13 to form a woven fabric 14, which is cut at the end of the woven fabric 14 on the weft insertion side by the yarn feeding cutter 4 on the weft insertion side. Note that the yarn feeding cutter 4 in this embodiment is fixed on an extension line before weaving on the yarn feeding side, and is opened at around a crank angle of 0 degree in conjunction with a crankshaft of a weaving machine (not shown). By closing near the angle of 40 degrees,
The weft thread 1 wefted is cut.

A known weft processing device 3 is provided on the weft insertion side in order to remove the weft yarn 1 having a wrong weft insertion or the weft yarn 1 having a knot as the defective weft yarn 1. A blow-up nozzle 16 is provided at a portion of the weft processing device 3 toward the intake of the guide tube 15.

The weft processing device 3 is, for example, the device described in the above-mentioned Japanese Patent Application Laid-Open No. 2-26436, and draws the defective weft 1 from the guide tube 15 into the device by suction air flow. By winding, the defective weft thread 1 from the opening 12 or the knot of the weft thread 1 from the upstream side of the main nozzle is removed.

FIG. 2 shows an operation sequence according to the present invention. When weft insertion failure occurs during weaving, the state is detected at the loom cycle where the weft insertion error has occurred, that is, near the crank angle of 290 degrees in one rotation range of the loom crankshaft, and a loom stop signal is output. The loom stops at about 300 degrees of crank angle in the next one rotation range while rotating by inertia.

The blow-up nozzle 16 injects air from the time when the weft insertion error occurs until immediately before the subsequent yarn processing, that is, immediately before the removal of the defective weft yarn 1, is started.
By operating the solenoid 10, the locking pin 9 is retracted,
The weft 1 stored in the drum 8 is disassembled and wound, for example, by one turn, and the weft 1 is displaced toward the intake port side of the guide tube 15 of the weft processing device 3 at the tip of the main nozzle 2. 3 also generates a suction air flow in the intake port to draw in the weft thread 1 in preparation for the removal of the weft thread 1. For this reason, the weft yarn 1 is curved between the main nozzle 2 and the weft insertion side end of the woven fabric 14, and is off the weft insertion path. Therefore, in the one rotation range at the time of stoppage, even if the sheath 13 drives the defective weft thread 1 to the position before weaving and the yarn feeding cutter 4 performs the cutting operation, the weft thread 1 is not cut, and the inside of the main nozzle 2 is not cut. It is in a state of being connected to the weft insertion error portion via the weft yarn processing device 3.

Thereafter, the loom is automatically or reversely rotated by the weaver to rotate the loom from one rotation range at the time of stoppage to approximately 200 degrees of crank angle in one rotation range of weft insertion error, and temporarily stops here. As a result, the defective weft thread 1 is discharged.

Here, the solenoid 10 operates in response to a command from the weaving or automatic control unit, and the locking pin 9 is retracted to unwind the weft 1 stored in the drum 8 and to release the main nozzle 2. 3, a new weft thread 1 of, for example, one turn is supplied onto the weft insertion path as shown in FIG. Thereafter, as shown by a solid line arrow, when the loom is driven to rotate forward and is rotated to a crank angle of about 40 degrees in one rotation range at the time of stop, the loom is newly unwound by the sheath 13 at a crank angle of about 0 degrees. The weft thread 1 is beaten to a position close to the front of the weaving machine, and is displaced to the working area of the yarn feeding cutter 4 in the open state. Then, the yarn feed cutter 4 closes near the crank angle of 40 degrees, so that the new weft yarn 1 is cut at that position and separated from the tip of the main nozzle 2.

Thereafter, the loom is again rotated to a crank angle close to 200 degrees in the rotation range where the weft insertion error has occurred.
The warp yarn 11 forms an opening 12 so that the defective weft yarn 1 can be easily removed.

Alternatively, after supplying a new weft thread 1,
As shown by the dotted line arrow, when the loom is reversed and rotated to a crank angle of about 20 degrees in one rotation range of the weft insertion error, the weft yarn 1 newly unwound by the saw 13 is near the weaving front. And is displaced to the operating area of the yarn feed cutter 4 in the open state. Thereafter, the loom is driven to rotate forward to near the crank angle of 200 degrees in the same one rotation range to open the warp yarn 11 so that the defective weft yarn 1 can be easily removed. , Yarn feed cutter 4
Is closed, a new weft thread 1 is cut at that position and separated from the tip of the main nozzle 2. The weft processing device 3 removes the weft 1 that has been misinserted from the opening 12 by drawing in the weft 1 guided inside by winding or the like. After removing the defective weft thread 1, the loom is reversed to a crank angle close to 300 degrees in one rotation range before one rotation range of the weft insertion error, and is restarted from that position.

The operation in the case where the weft processing device 3 winds the weft 1 from the upstream side of the main nozzle and removes the knot will be described.

When the weft yarn 1 of the yarn feeder 5 is consumed and the weft yarn 1 is automatically drawn from the spare yarn feeder 5 via the transfer tail, the loom is stopped. After the loom is stopped, the leading end of the weft yarn 1 from the main nozzle 2 is guided to the weft processing device 3 by the guide nozzle 19.
Then, the weft processing device 3 is operated, and the knot is wound up together with the weft 1 on the length measuring and storing device side. When winding is completed, the weft yarn 1 is transferred from the main nozzle 2 to the weft processing device 3
Are in a row. After that, the loom is reversed to open the warp yarn 11 and the weft processing device 3 holds the weft yarn 1 while the main nozzle 2 rotates the new weft yarn 1.
Is supplied into the opening 12. At this time, a new weft thread 1 is once pulled out from the yarn supplying body 5 and stored by the length measuring and storing device, and then the locking pin 9 is retracted to unwind the weft thread 1 having a predetermined number of turns. After the new weft yarn 1 is supplied, the loom is rotated forward or backward to the same crank angle as in the above embodiment, and the weft yarn 1 is guided to the working area of the yarn feeding cutter 4 by the sheath 13 and cut.

In the above embodiment, the yarn feeding cutter 4 is used.
Is mechanically linked with the crankshaft of the loom, but may be driven by a solenoid or the like instead of such a yarn feeding cutter 4 so that the cutting operation can be performed regardless of the crank angle of the loom. . At this time, the forward rotation or the reverse rotation of the loom may be performed to a crank angle at which the sheath 13 guides the newly unwound weft yarn 1 to the working area of the yarn feeding cutter 4.

[0021]

Embodiment 2 In Embodiment 2, when the weft yarn 1 is connected between the main nozzle 2 and the weft processing device 3, the weft yarn 1 is held by the pair of clampers 17 at the upstream side of the main nozzle 2. While the main nozzle 2 ejects a fluid, the weft yarn 1 connected to the main nozzle 2 and the weft processing device 3 is displaced on a weft insertion path, and is cut by a movable yarn feeding cutter 4. This corresponds to claim 2 of the claims. Note that, instead of the pair of clampers 17, the weft thread 1 may be held by advancing the locking pin 9.

As shown in FIG. 4, in this embodiment, the weft processing device 3 is a device for preventing weft yarn 1 from being inserted into the opening 12, that is, for preventing weft insertion. A suction pipe 18 and a guide nozzle 19 are provided between the end of the woven fabric 14. A pair of clampers 17 is provided upstream of the main nozzle 2, and one of the clampers 17 can be opened and closed by a solenoid 20.

When weft insertion failure occurs, the weft processing device 3
When a command to prevent weft insertion in one rotation range at the time of stop is given to the suction pipe 18, the suction pipe 18 starts a suction operation, and the guide nozzle 19 injects air toward the suction pipe 18, thereby An airflow in a direction intersecting the insertion direction is generated by the tip portion of the nozzle 2. Therefore, even if the main nozzle 2 attempts to inject the unwound weft 1 at the weft insertion timing, the weft 1 is not
The air flow flowing from the suction pipe 9 into the suction pipe 18 causes the suction pipe 1
It is drawn inside 8 and cannot be inserted. In this manner, the weft yarn 1 for one pick is drawn into the suction tube 18 where it is held by the air flow. When the weft yarn 1 for one pick is unwound from the drum 8, the locking pin 9 is advanced. The defective weft 1 is beaten by the time the loom stops, and is cut by the yarn feeding cutter 4.

After the loom is stopped, the solenoid 20 is operated to close the pair of clampers 17, thereby holding the weft thread 1 upstream of the main nozzle 2. Therefore,
In this state, the weft yarn 1 exits from the tip of the main nozzle 2 and enters the inside of the suction pipe 18 at the shortest distance.

In this state, after the weaving machine is reversed to the crank angle of 200 degrees in one rotation region where the weaving machine is misplaced, or without rotating the loom forward and backward, the crank angle of 300 degrees in the one rotation region when stopped, the guide nozzle 19 Is stopped, the suction force of the suction pipe 18 is weakened or stopped, and the main nozzle 2 is operated with a weak spray force. Since the weft thread 1 having a sufficient length is sucked into the suction pipe 18, the suction pipe 18
The weft 1 is drawn out of the suction tube 18 while being continuously connected between the main nozzle 2 and the suction tube 18 and is opened or closed as shown by a two-dot chain line.
It is displaced on the extension of the weft insertion path and lies in front of the active area of the movable yarn feed cutter 4.

Thereafter, the yarn supplying cutter 4 is moved from the retracted position to a position where the weft yarn 1 lays down by the moving means 21 such as an air cylinder, and the weft yarn 1 is brought to the working area, and then driven by the solenoid 20 to cut. Perform the operation.
As a result, the weft yarn 1 connected 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 feed cutter 4 in a forward state. Thereafter, the weft processing device 3 generates an airflow in the drawing direction inside the suction pipe 18, draws the cut weft 1 into the inside, and discharges the cut weft 1 to a predetermined position.

[0027]

Other Embodiments Embodiments 1 and 2 are different from each other in order to represent different operation modes. However, the components and the operation order are different from those in Embodiments 1 and 2. As long as there is no inconsistency between the above, the present invention can be implemented with replacement.

[0028]

According to the present invention, when the weft yarn is connected to the weft processing device from the main nozzle, the main nozzle or the weft processing device side starts the injection operation of the main nozzle while holding the weft yarn. Since the weft yarn is supplied from the weft processing device side or the main nozzle side to the weft insertion path, where it can be cut by the yarn feed cutter, a dedicated yarn feed cutter for yarn processing is not required, and the existing yarn feeder is installed. Can be used as it is, and when using the yarn feed cutter,
No special guide member is required, and the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an apparatus for implementing a weft cutting method according to a first embodiment.

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

FIG. 3 is an explanatory view at the time of cutting a weft thread.

FIG. 4 is an explanatory view of an apparatus for implementing the weft cutting method according to the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 weft yarn 2 main nozzle 3 weft processing device 4 yarn feed cutter 9 locking pin 17 clamper

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D03D 51/00 D03D 47/28-47/38

Claims (2)

(57) [Claims] 1. A weft processing device provided between a main nozzle and an end of a woven fabric for processing a weft connected to the main nozzle, wherein the weft is connected between the main nozzle and the weft processing device. At the same time, while holding the weft yarn on the weft yarn processing device side, a new weft yarn is supplied on the weft insertion path by ejecting a fluid from the main nozzle, and the supplied weft yarn faces the working area of the yarn feeding cutter,
A weft cutting method characterized by cutting by a yarn feeding cutter. 2. A weft processing device provided between a main nozzle and an end of a woven fabric for processing a weft connected to the main nozzle, wherein a fluid is discharged from the main nozzle while holding the weft at an upstream side of the main nozzle. Let me inject
A weft cutting method, comprising: displacing a weft from a main nozzle to a weft processing device on a weft insertion path, exposing the displaced weft to a working area of a yarn feed cutter, and cutting the weft by the yarn feed cutter.