JPH07252753A - Device for drawing off defective weft yarns - Google Patents

Abstract

PURPOSE:To take up a weft yarn around the take-up roller in contact with the rotor under a pressure and ensure defective weft yarn following the weft to be drawn off from the cloth fell. CONSTITUTION:When an air-jet loom automatically stops due to occurrence of defective weft yarn, the guide nozzle 2 jets air to allow the weft 30a in the range from almost top end of the weft jet nozzle 5 to the woven fabric to flow and move toward the lower face opening of the guide cylinder 27 in the take-up device 4. Simultaneously, the weft yarn 30a is pulled into the inside of the rotor with an air-jet stream from the nozzle 21 of the wind-up device 10 and is held by allowing the wind-up device 10 which is freely movable along the axis line toward the rotor 9 to contact with the rotor 9 under a pressure, then cut near the nozzle 5. In the meantime, the loom automatically rotates reversely to open the cloth fell 6a of the defective weft 30a connecting to the weft 30a to pull off the defective weft 30b connecting to the wrong operating weft 30a, as the weft is wound up around the wind-up device 10 rotating with the friction of the rotor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for picking up a defective weft thread from the front of a cloth when the weft insertion failure occurs.

[0002]

2. Description of the Related Art As a technique of this kind, Jitsuko 56-1
There is a device of 7503. The idea is to separate the weft thread that is not wefted in a free state by separating it from the weave, and then use the nozzle on the weft insertion side and the suction means on the arrival side to re-insert the weft thread into the opening in a normal state. There is. In the above invention, the weft yarn once beaten as a weft insertion defect is woven again, which is not preferable in terms of the quality of the woven fabric.

On the other hand, in the invention of Japanese Patent Laid-Open No. 59-21757, when the weft insertion is defective, the weft insertion is performed by separating the weft from the front of the woven fabric and then by the suction action of the suction nozzle and the winding action of the waist roller. This shows that the defective weft thread is pulled out from the opening. However, in that invention,
Prior to picking up the defective weft thread, the step of separating the defective weft thread from the weave of the woven fabric is indeterminate.Therefore, a special separating means is required, and the certainty of the operation is low, which poses a practical problem. is there.

[0004]

OBJECTS OF THE INVENTION It is therefore an object of the present invention to ensure that defective weft yarns can be pulled from the weave.

[0005]

Therefore, the present invention relates to a take-up device of a device for removing a defective weft thread from the inside of an opening by pulling out a weft thread connected to a defective weft thread from a weft insertion side of a woven cloth. The device includes a housing, a cylindrical rotating body rotatably supported inside the housing, a rotation driving unit that rotationally drives the rotating body, and a rotatable body on the same axis as the rotation axis of the rotating body. A winding body supported inside the housing in a state of being movable in the axial direction between a position in contact with the rotating body and a position apart from the rotating body, and a space where the rotating body and the winding body face each other. A guide hole provided in the housing opening to
An air flow generating means for generating an air flow from the space toward the inside of the rotating body, and the weft thread guided by a guide hole provided in the housing into the space where the rotating body and the winding body face each other. Is drawn into the inside of the rotating body by the air flow from, and then the winding body is moved to a position where it comes into contact with the rotating body to grip the weft thread, and the rotating body is rotated via the rotation drive means while holding the weft thread. The defective weft thread is wound on the rotating body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The most preferred embodiment of the present invention will be specifically described below with reference to FIGS.

The defective weft removing device 1 has
It is provided with a guide nozzle 2, a cutter 3 and a take-up device 4 of the present invention. The guide nozzle 2 is provided between the weft insertion nozzle 5 and the weft insertion side end of the woven fabric 6 on the yarn supplying side,
It is directed in a direction deviating from the flight path at the time of horizontal insertion, for example, obliquely upward. The cutter 3 is fixed together with an auxiliary yarn guide 7 at the tip of the weft insertion nozzle 5, for example. The tip of the auxiliary yarn guide 7 is bent, for example, in a U-shape, and when the weft thread 30a is pulled through the bent portion, the defective weft thread 30b in the opening 33 gradually moves away from the cloth fell 6a. Moreover, it is located at a position where it does not come into contact with the warp yarn 32 at the end of the cloth.

The take-up device 4 of the present invention rotatably supports the cylindrical rotating body 9 and the winding body 10 inside the cylindrical housing 8. One rotating body 9
Is fixed to one end of a hollow drive shaft 11 by means such as press fitting, and is rotatably supported by bearings 12 at both ends together with the hollow drive shaft 11. The conical hole 13 is formed on the surface facing the winding body 10. Is forming. The center side bearing 12 is fixed by means such as press-fitting, and the end bearing 12 is held by the bearing retainer 14 via the stopper collar 35 and the thrust washer 36. The hollow drive shaft 11 is
The tip portion faces the inside of the discharge pipe 15 and meshes with the gear 17 of the drive motor 18 by the gear 16.
The gears 16 and 17 and the drive motor 18 form a rotation drive means.

On the other hand, the winding body 10 has a housing 8
It is rotatably supported by a slide bearing 20 in the inside of the container and is movable in the axial direction. A conical surface 19 is formed at the tip and a nozzle hole 21 is formed at the center. The nozzle hole 21 is an air flow generating means, and is a connection port attached to the housing 8 by an annular grooved hole 10 a formed in the outer circumference and the diametrical direction of the winding body 10 and a communication passage 22 of the sliding bearing 20. It leads to 23. Further, the winding body 10 has a rear end portion,
A piston 24 having the housing 8 as a cylinder is formed, and is prevented from coming off by an end cap 25 attached to the end surface of the housing 8. The end cap 25 fixes a connection port 26 leading to the cylinder chamber on the rear end side of the piston 24.

In this way, the rotating body 9 and the winding body 10 face each other while forming an appropriate space. In this space, the housing 8 holds the guide cylinder 27 in a crossed state. The guide cylinder 27 is open at the upper and lower surfaces, and is communicated with the guide hole 28 in the substantially middle portion in the space where the rotating body 9 and the winding body 10 face each other. If necessary, a baffle plate 29 is attached to the upper opening surface of the guide cylinder 27.

Next, the operation of the defective weft removing device 1 will be described with reference to FIG. At the time of normal weft insertion, the weft insertion nozzle 5 measures the length of the weft yarn 30 and pulls out the weft yarn 30 from a weft yarn length measuring / storing device that stores the weft yarn 30, and sequentially wefts the weft yarn 30 into the opening 33 at the weft insertion timing.

When a weft insertion failure occurs during the weft insertion operation, the loom applies a brake after receiving the weft stop signal and automatically stops in the next cycle. Such a weft insertion failure is detected by a known weft feeler or the like at the cloth edge portion on the arrival side of the weft thread 30.

At the time when the weft stop signal is generated, the weft thread 30 is displaced from the cutting position of the thread processing cutter 31 by the jet airflow from the guide nozzle 2, so that the weft thread 30 inside the weft insertion nozzle 5 is Insert nozzle 5
Thread 30a between the weave and the woven cloth 6, defective weft thread 30b
Are still connected, and the defective weft thread 30 can be processed from the weft insertion side. The weft yarn length measuring and storage device supplies the weft yarn 30 having an appropriate length to the weft insertion nozzle 5. The length of the weft thread 30 is a length required to bring at least the weft thread 30 from the weft insertion nozzle 5 to the guide hole 28 of the take-up device 4 by the jetting operation of the guide nozzle 2. In the case of a device, it can be obtained by unwinding, for example, only one roll of weft yarn 30 on a drum with a locking pin,
Further, in the case of the length measuring roller / air storage type weft yarn length measuring and storing device, the clamper is released for a predetermined time on the upstream side of the weft insertion nozzle 5 to temporarily release the grip of the weft yarn 30. can get.

At the time when the weaving stop signal is given by the loom, first, the guide nozzle 2 injects air from its tip to weft the weft thread 30a in a section from the tip end side of the weft insertion nozzle 5 to the woven cloth 6. In order to prevent the weft yarn 30a from being blown off between the insertion nozzle 5 and the woven fabric 6 and being cut off by the cutter 31 for yarn feeding at the end of the woven fabric 6, the weft yarn 30a is opened on the lower surface side of the guide tube 27 of the take-up device 4. Move toward the surface. At the same time, the winding body 10 takes in compressed air from the outside, injects air from its nozzle hole 21 toward the conical hole 13 of the rotating body 9, and generates negative pressure air in the vicinity thereof. As a result, the weft thread 30a in the blown state
Enters the inside of the guide cylinder 27, is then drawn into the front surface of the nozzle hole 21 from the guide hole 28, and further enters the inside of the drive shaft 11 from the conical hole 13 in a folded state.

While the cutter 31 is performing the cutting operation during this time, the weft thread 30a is not cut because the weft thread 30a is displaced from the position of the cutter 31. As a result,
The weft thread 30a remains connected to the weft thread 30 on the weft insertion nozzle 5 side and the defective weft thread 30b on the woven fabric 6 side. At this time, the weft thread 30a enters the yarn guide 7 and hangs on it.

In the meantime, the loom stops completely in the next cycle, and then automatically reverses to make the weft cloth 6a of the defective weft thread 30b open. At this point, the guide nozzle 2
Stops the air injection, but the winding body 10 continues the air injection from the nozzle hole 21 for a while. While the air is being jetted from the nozzle hole 21, the piston 2
4 receives compressed air and moves forward against the spring 34, so that the conical surface 19 of the winding body 10 presses against the conical hole 13 of the rotating body 9 and grips the weft thread 30a between them.
At the same time, the cutter 3 operates and the weft insertion nozzle 5
30a connected between the pick-up device 4 and the take-up device 4
Is cut near the weft insertion nozzle 5.

After that, the drive motor 18 receives the start command and automatically starts to rotate the drive shaft 11 by the gears 16 and 17 to give the rotary body 9 a rotational motion. At this time, the winding body 10 receives a frictional rotational force between the conical surface 19 and the conical hole 13 and rotates at the same speed, and the weft thread 3
0a and the defective weft thread 30b are wound on the conical surface 19. By this winding, the defective weft thread 30b is pulled out from the cloth cloth 6a of the woven cloth 6.

In this drawing process, the yarn guide 7 sets the direction of drawing the defective weft thread 30b closer to the opening 33 than the extension line of the cloth fell 6a, and the direction in which the defective weft thread 30b does not rub against the warp threads 32 at the cloth end. Therefore, the defective weft thread 30b is pulled out from the cloth fell 6a toward the opening 33 side with a small resistance. The take-up direction of such a defective weft thread 30b is
The yarn guide 7 regardless of the installation position of the take-up device 4.
It is set by the mounting position of. This can also be set by disposing the take-up device 4 in the same position as the yarn guide 7.

In this way, the rotating body 9 and the winding body 10 are weft-inserted at the outer periphery of the conical surface 19 and the weft thread 30 is defective.
Remove b completely. The time required for such winding is set by a timer or the like, or the complete removal state of the defective weft thread 30b is set, for example, in the guide tube 27.
It can be determined by detecting with an optical sensor at the lower end of the.

After the elapse of such a fixed time, the drive motor 18 automatically stops. Also, the piston 24
The compressed air is lost, and the spring 34 moves in the backward direction to release the pressure contact between the conical surface 19 of the winding body 10 and the conical hole 13 of the rotating body 9. At the same time, the winding body 10
Re-injects air from the nozzle hole 21 and the conical surface 1
The weft yarn 30a and the defective weft yarn 30b wound around the yarn 9 are blown off toward the conical hole 13, sent out to the discharge pipe 15 via the hollow drive shaft 11, and discharged to a predetermined position. In the present embodiment, the conical portion is formed in the pressure contact portion between the winding body 10 and the rotating body 9, but the shape of the pressure contact portion is not limited to this.
For example, the same effect can be obtained by forming it in a disc shape.

When the work for extracting the defective weft thread 30b is completed, the loom automatically reverses the required angle again, and then receives the automatic operation command and starts the normal weaving operation. Therefore, even if a weft insertion failure occurs during operation of the loom, a defective weft thread
The operation of extracting 0b is not required, and the loom automatically starts regular weaving.

During the extraction process, the defective weft thread 30
When b is cut halfway, the winding operation of the defective weft thread 30b is completed earlier than usual. The separate control device measures the winding time by the sensor and prohibits the restart of the loom when the winding time is shorter than the time required for the predetermined winding.
During such a thread removing operation, it is possible to easily confirm from the outside that the operation is in progress by turning on an appropriate pilot lamp or the like. Further, such an automatic removal operation of the defective weft thread can be automatically stopped by pushing a release button or the like on the control device side.

[0023]

According to the present invention, the weft thread guided into the space between the rotary body and the winding body through the guide hole provided in the housing is drawn into the rotary body by the air flow from the air flow generating means. After that, the winding body is moved to a position where it comes into contact with the rotating body, and the winding body (10) and the rotating body (9) grip the weft thread, and rotate in the gripped state via the rotation drive means. Rotate the body and wind the bad weft onto the rotating body. Therefore, since the front end of the weft thread is pulled into the inside of the rotating body, the weft thread is reliably gripped by the rotating body and the winding body. Then, the defective weft yarn, which is hung on the weft yarn, is pulled out from the cloth fell without a malfunction due to the strong winding force.

[Brief description of drawings]

FIG. 1 is a plan view of a defective weft removing device.

FIG. 2 is a vertical sectional view of the defective weft yarn removing device.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a time chart diagram during operation.

[Explanation of symbols]

 1 Defective weft removing device 2 Guide nozzle 3 Cutter 4 Take-up device 5 Weft insertion nozzle 6 Woven cloth 7 Yarn guide 8 Housing 9 Rotating body 10 Winding body 11 Hollow drive shaft 12 Bearing 13 Cone hole 18 Drive motor 19 Cone surface 21 Nozzle Hole 24 Piston 27 Guide tube 30 Weft thread 30a Weft thread on the tip side of the weft insertion nozzle 30b Defective weft thread

Claims (1)

[Claims] 1. A defective weft insertion (3) is pulled out from the weft insertion side of the woven cloth (6) by pulling out the weft insertion (30a) connected to the defective weft insertion (30b) from the inside of the opening (33).
0b) removing device (4), which comprises a housing (8) and a cylindrical rotating body (9) rotatably supported inside the housing (8). ), Rotation driving means (16, 17, 18) for rotationally driving the rotating body (9), and the rotating body (9) being rotatable on the same axis as the rotating shaft of the rotating body (9). A winding body (10) supported inside the housing (8) in a state of being movable in the axial direction between a position in contact with and a position apart from each other, the rotating body (9) and the winding body. A guide hole (28) provided in the housing (8) opening in a space facing the body (10), and an airflow generating means (21) for generating an airflow from the space toward the inside of the rotating body (9). ) And a guide hole (28) provided in the housing (8) The weft thread (30a) guided in the space where the rotating body (9) and the winding body (10) face each other is drawn into the inside of the rotating body (9) by the airflow from the airflow generating means (21), and then wound. The weft thread (30a) is grasped by moving the body (10) to a position where it comes into contact with the rotating body (9),
While holding a), the rotation driving means (16, 17, 1)
Rotate the rotating body (9) through 8), and
0b) is wound on the rotating body (9), and a device (4) for collecting defective weft yarns.