JPH04300345A - Weft holder of shuttle-lens weaving machine - Google Patents

Abstract

PURPOSE:To retain weft end released from rapier in a state of tension after finishing wefting. CONSTITUTION:Grippers 28 capable of holding and releasing weft 2 are integrally provided in a suction nozzle 22 oscillating while synchronizing with beating motion of reed 1 by a moving device 9 and after finishing wefting of rapier 7, weft end is retained in a state of tension by suction action of suction nozzle 22 and blowing-up action of jet nozzle 6 fixed in the reed 1 and simultaneously weft end kept in the state of tension is held by the grippers.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft holding device for holding a inserted weft in a taut state in a shuttleless loom.

0002

BACKGROUND OF THE INVENTION Conventionally, in order to hold the weft-inserted yarn ends under tension, a so-called selvage was formed using a yarn end catching yarn. However, this waste selvage formation increases the amount of yarn remaining and becomes a factor in high production costs. Therefore, in order to eliminate the need for forming a selvedge, there was a weft holding device that utilized airflow (Utility Model Application No. 85684/1984). This is because a pipe and a jet nozzle directed toward the pipe are integrally installed in the reed on the side opposite to weft insertion, and when the inserted weft end passes through the opening of the pipe, the weft end is pushed into the pipe by the air jet from the jet nozzle. The weft ends are guided to the weft and held in a tensioned state by the action of this air flow, and then, in this state, the ends of the weft threads that are guided to the fabric are delivered to the holes on the side where the machine is fixed by an air flow blown out from another nozzle. The beating motion was performed while maintaining the tension of the weft threads.

0003

[Problems to be Solved by the Invention] In the conventional weft holding device, the weft ends are reliably tensioned because they are transferred from the pipe on the reed side to the holes on the machine stand side by the action of only the airflow from the injection nozzle. It was difficult to keep it in place, and there was a problem in that the weft threads became loose during delivery. In this case, there was a problem in that the selvage of the woven fabric was not tightly packed and the quality deteriorated.

0004

[Means for Solving the Problems] In order to solve each of the above-mentioned problems, the present invention provides a weft holding device that holds the weft end without using a weft holding yarn, in which the inserted weft end is moved in the weft insertion direction. A suction nozzle that suctions at an angle to the weft is provided on the opposite weft entry side so as to be able to swing in synchronization with the reed, and this suction nozzle is integrally equipped with a gripper on the fabric side that can grip and release the suctioned weft. It is characterized by

[0005]

[Operation] When the weft yarn is inserted and reaches the weft insertion point, the weft end is guided into the suction nozzle by the suction action of the suction nozzle, held in a tensioned state, and held in this state by the gripper, and then While maintaining this state, the gripper moves together with the suction nozzle in synchronization with the beating movement of the reed.

[0006]

[Embodiment] In FIGS. 1 and 2, reference numeral 1 denotes a reed for weaving inserted weft threads 2 into a woven fabric 3. As is well known, this reed 1 is moved toward the woven fabric 3 at a predetermined angle by a drive device (not shown). It is attached to a mounting holder 5 that swings back and forth, and performs a predetermined beating motion. A spray nozzle 6 is fixed to the upper surface of the end opposite to the weft insertion side of the attachment holder 5, and is oriented toward the weft insertion position P when the reed 1 is at the most retracted position, as shown in FIG. The injection nozzle 6 is connected to a compressed air source via a solenoid valve (not shown), and is controlled to inject an air flow at a predetermined time related to the movement of the rapier 7, as will be explained later in the operation section. 7 is a rapier on the opposite yarn feeding side for inserting the weft yarn 2 (generally called a rapier hook)
At the time when the reed 1 is retreating, the weft insertion position P
The weft 2 is received from a rapier (generally called a rapier hook) on the yarn feeding side and conveyed to the side opposite to the weft insertion side. As is well known, the rapier 7 is provided with a hook portion for gripping the weft yarn 2, and is configured to release the grip on the weft yarn 2 after weft insertion is completed.

Reference numeral 8 denotes a weft holding device that holds the inserted weft 2 in a tensioned state, and includes a moving device 9, a suction nozzle 22, and a gripper 28. First, the moving device 9 will be explained. A camshaft 13 rotatable by a drive device (not shown) is supported on the frame 12 on the side opposite to the weft insertion side, and a pair of left and right rotating cams 14a, 14b are fixed to the camshaft 13. Further, a V-shaped arm 17 and an L-shaped arm 18 are pivotally attached to the frame 12 via a pivot 16, respectively. One end of this V-shaped arm 17 is urged downward by a spring 20a interposed between this end and a fixed shaft 19 fixed to the frame 12 in FIG.
Cam follower 21a provided at the other end of the letter-shaped arm 17
comes into contact with the cam surface of the left rotation cam 14a. Further, the substantially central portion of the L-shaped arm 18 is urged downward by a spring 20b similarly to one end of the V-shaped arm 17, and a cam follower 21b provided at one end of the L-shaped arm 18 is connected to the right rotating cam 14. It comes into contact with the cam surface. The upper end of a swinging member 23 whose lower part is formed into a suction nozzle 22 is pivotally attached to the other end of this L-shaped arm 18 by a shaft 23a. The upper part of the swinging member 23 and the lower part of the other end of the V-shaped arm 17 are connected to the connecting rod 2.
It is pin-connected by 4. When the cam shaft 13 of the moving device 9 is rotated, the left and right rotating cams 14a, 14
Due to the action of b, the suction nozzle 22 of the swinging member 23 descends from the standby position A shown by a solid line in FIG. In synchronization with this, it swings forward about the shaft 23a as a fulcrum to a weft cutting position C shown by an imaginary line, and then rises and retreats to return to the standby position A again.

Next, the suction nozzle 22 will be explained with reference to FIGS. 1, 2, and 4. One end of the suction nozzle 22 is connected to the other end of a suction duct 26 connected to a suction recovery device (not shown) via a connecting pipe 25, so that the suction nozzle 22 normally performs a suction operation. Moreover, the suction nozzle 22 is
When the rapier 7 releases the inserted weft end, the weft end is bent (90 degrees) with respect to the weft insertion direction and sucked. Further, the lower part of the mounting wall 27 facing the 3 ends of the woven fabric of the suction nozzle 22 is formed in the same shape as the gripping interior space 32 of the gripper 28, which will be described later.

Next, the gripper 28 integrally attached to the mounting wall 27 of the suction nozzle 22 will be explained. This gripper 28 consists of a fixed gripping piece 29 and a movable gripping piece 30,
The fixed gripping piece 29 is screwed and fixed to the mounting wall 27, and the movable gripping piece 30 is attached to the support member 3 fastened to the mounting wall 27.
1 is rotatably supported at the approximate center thereof, and both gripping pieces 29
, 30, the weft is gripped by a gripping portion 33 above the gripping guide space 32 formed by the wefts. The upper part of the movable gripping piece 30 is bent in the horizontal direction as shown in FIG. The leaf spring 36 contacts the inner surface of the contact portion 30a and biases the contact portion 30a rearward. As will be described later, when the engaging piece 37 of the movable gripping piece 30 is not engaged with the engaging surface 38a, in FIG. 2, for example, the suction nozzle 22
When is located at the weft separation position C, the movable gripping piece 30 is rotated clockwise about the support member 31, and the gripping portion 33 is in a gripping state. The engagement piece 37 attached to the outer surface of the contact portion 30a is cut into an L-shaped bracket 38 fixed to the support plate 16 when the suction nozzle 22 moves from the standby position A to the weft holding position B. The contact portion 30a is pushed forward against the urging force of the leaf spring 36, and the movable grip piece 30 is moved against the support member 31.
The handle 33 is rotated counterclockwise around the center to release the grip part 33.

A cutter 40 is fixed to the frame 12 on the side opposite to weft insertion, and is located between the suction nozzle 22 at the weft cutting position C and the woven fabric 3, and is located at the reeding position Q after reeding. The weft thread 2 located at is cut off.

Next, the function of the weft holding device 8 will be explained. When the rapier loom is operated, the reed 1 swings back and forth in a well-known manner to perform a predetermined beating motion, and when the reed 1 retreats, the rapier 7 inserts the weft 2 into the opening between the upper and lower threads. The weft is inserted, and then the heddle frame switches the warp up and down to perform the specified weaving. When the reed 1 is located at the most retracted position shown by the solid line in FIG.
grabs the weft and moves to the 3rd end of the woven fabric on the anti-weft insertion side (FIG. 5), and at the same time as the rapier 7 passes below the suction nozzle 22, the suction nozzle 22 is moved to the standby position A by the action of the moving device 9. It moves toward the weft gripping position B. At this time, the gripping portion 33 of the gripper 28 holds the engaging piece 3
7 is in pressure contact with the engagement surface 38a, so it is in a released state,
Also, air is blown out for a predetermined period of time from an injection nozzle 6 fixed to the reed 1. Then, the rapier 7 passes through the suction nozzle 22, reaches the weft insertion point, and releases the weft ends. Then, this weft end is moved to the suction nozzle 22 located at the weft gripping position B in FIG.
Due to the suction action and the upward air flow of the jet nozzle 6, the weft is guided into the suction nozzle 22 through the gripping guide space 32 in a direction perpendicular to the weft insertion direction, and is held in a tensioned state. When the weft ends are held under tension in this way, the suction nozzle 22
Due to the action of the moving device 9, the reed 1, which has moved to the center of the opening in FIG. 6, begins to swing toward the weft separation position C in FIG. The engagement with the mating surface 38a is released, and the gripper 2
The gripping section 33 of No. 8 is in a gripping state, and the weft end is held by the gripper 2.
It is held in a tensioned state by the grip section 8.

After that, as shown in FIG. 7, the suction nozzle 2
In synchronization with the beating movement of the reed 1, the reed 2 swings to the weft separation position C (corresponding to the beating position Q) shown in FIG. 2 while keeping the weft end under tension. Then, as shown in FIG. 8, the reed 1 moves to the backward end position, and the rapier 7 begins to move into the opening for the next weft insertion. At this time, the weft ends located at the beating position Q shown in FIG. 2 are cut off by the cutter 40. After that, as shown in FIG. 9, the suction nozzle 2
2 is a gripper 28 to suck and hold the next weft end.
returns to the standby position A in FIG. 2 while holding the yarn end waste. At this time, the engaging piece 3 of the movable gripping part 30 of the gripper 28
7 engages with the engaging surface 38a, the grip part 33 becomes released, and the gripper 28 releases the thread end waste that has been gripped until now. The thread end waste is collected by a thread end waste collection device (not shown). The rapier loom then repeats the operation described above.

When the gripper grips the weft yarn, this weft holding device suctions and guides the weft end into the suction nozzle at an angle by the suction action of the suction nozzle, and continues to grip the weft yarn end with the gripper while holding the weft end in a tensioned state. We are doing
Compared to a method in which the transfer is carried out using airflow, the weft ends are more reliably held in tension, thereby preventing the weft from loosening. Further, since the gripper and the suction nozzle are integrated, the weft yarn waste separated after beating can be collected as is with the suction nozzle having a small opening area. Further, in this embodiment, when the weft end is held under tension in the suction nozzle, the amount of air blown up from the jet nozzle is applied together with the suction action of the suction nozzle, so that the weft end is held more reliably.

Next, referring to FIG. 10, another embodiment of the weft holding device 50 will be described. This weft holding device 50
is equipped with a suction nozzle 22 and a gripper 28 on a bracket 61 that is integrally fixed to the mounting holder 5 of the reed 1 on the side opposite to weft insertion, and moves along the edge of the woven fabric in synchronization with the beating movement of the reed 1. It is supposed to be done. The tip of this suction nozzle 22 opens on the upper surface of the mounting portion 51a of the bracket 51, and is normally used for suction. The gripper 28 is made up of a solid gripping piece 29 and a movable gripping piece 30. The fixed gripping piece 29 is fixed to the upper surface of the mounting portion 51a, and the movable gripping piece 30 is connected to a pin 53 at its approximate center, and swings around this pin 53. It is possible to move. The fixed gripping piece 29 and one end of the movable gripping piece 30 form a weft gripping part 33, and the upper part of the weft gripping part 33 is formed into a V-shaped guide surface 33a. Further, a suction port 54 communicating with the opening of the suction nozzle 22 is formed. This movable gripping piece 30 has a block 5 fixed to the other end of the movable gripping piece 30 (the left end in the drawing) and the side surface of the mounting part 51a.
A spring 57 is interposed between the grip portion 33 and the grip portion 33, and is biased to rotate counterclockwise about the pin 53, so that the grip portion 33 is in a closed state. Further, the strength of the spring 57 is set so that the weft end is sucked into the suction nozzle 22 and also enters and is gripped by the gripping portion 33 in the closed state, as will be described later. 58 is a cam provided on a rotatable pivot 59 on the frame 12, and after the reed 1 is hit, the first
After the weft is cut by the cutter 40 similar to the embodiment, the cam 58 comes into contact with one end (the left end in the drawing) of the movable gripping piece 30 and rotates the movable gripping piece 30 clockwise around the pin 53. The grip portion 33 is brought into a released state.

Next, the function of this weft holding device 50 will be explained. When the rapier approaches the weft insertion point,
The reed 1 advances to the center of the opening, and the suction nozzle 22 of the weft holding device 50 is located directly below the weft 2. After that, when the rapier completes weft insertion and releases the weft end, this weft end
Due to the suction action of the suction nozzle 22, it is guided into the suction nozzle 22, and is gripped by the closed grip portion 33 of the gripper 28, and held in a tensioned state. Next, the weft ends are beaten in this state and separated by a cutter 40. At this time, the suction nozzle 22 and the gripping part 3 of the gripper 28
The weft end waste is still held in the weft end waste, and immediately after the weft end waste is cut off by the cutter 40, the cam 58
The grip part 33 becomes released due to the action of
It is sucked and collected inside. Thereafter, the reed 1 moves to the most retracted position and repeats this operation thereafter. Note that the same reference numerals are used for the same parts as in the first embodiment.

[0016]

As described above, in the weft holding device of the present invention, a gripper is integrally provided with the suction nozzle that moves in synchronization with the reed until at least the reed beating after weft insertion, and the weft end after weft insertion is held within the suction nozzle. Since the weft is suctioned and held at an angle with the weft insertion direction, the gripper continues to hold the weft, so the weft can be held under tension more reliably than when the tension is maintained only by airflow, and the loosening of the weft can be prevented. Therefore, the quality of the woven fabric can be improved. In addition, since the suction nozzle and gripper are integrated, the weft ends are separated after beating, and the lint generated at this time can be collected as is in the suction nozzle that holds the weft under tension, making it possible to reduce the opening area of the suction nozzle. The amount of air consumed can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of a rapier loom. .

FIG. 2 is a side view of the weft holding device of the present invention.

FIG. 3 is a developed view seen from R in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is an action explanatory diagram.

FIG. 6 is an action explanatory diagram.

FIG. 7 is an action explanatory diagram.

FIG. 8 is an explanatory diagram of the action.

FIG. 9 is an explanatory diagram of the action.

FIG. 10 is a perspective view of another embodiment.

[Explanation of symbols]

1 reed, 8 weft holding device, 22 suction nozzle, 28 gripper

Claims (1)

[Claims] Claim 1: In a weft holding device that holds a weft end without using a weft holding yarn, a suction nozzle that sucks the inserted weft end at an angle to the weft insertion direction is synchronized with the reed on the opposite side of the weft insertion. A weft holding device for a shuttleless loom, characterized in that the suction nozzle is provided so as to be swingable, and a gripper that can grip and release a suctioned weft is integrally attached to the cloth side of the suction nozzle.