JPS626942A - Weft yarn cutter in shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a weft cutting device for a shuttleless loom, and in particular,
When the weft ejected from the weft insertion nozzle does not reach the non-cotton insertion side, in order to easily remove the failed weft yarn that does not reach the yarn feeding side while remaining connected to the yarn feeding side, the faulty weft yarn is inserted between the weft insertion nozzle and the warp. The present invention relates to a weft cutting device that prevents cutting.

[Conventional technology]

Conventionally, as a device of this kind, for example, a device used in an air injection type loom is shown in FIG. 6 (Japanese Utility Model Publication No. 17503/1983).

FIG. 6 shows the vicinity of the weft insertion nozzle l from which the weft yarn W is injected. Reference numeral 2 denotes a weft cutting device, which includes a weft cutter 3 consisting of a fixed blade 3a and a movable blade 3b, and a device 4 in the weft I. The fixed blade 3a is fixed to the machine frame 6 via a sleeve 5, and the movable blade 3b is rotatably supported by the sleeve 5 via a shaft 7. A spring (not shown) is installed inside the sleeve 5, and constantly urges the movable blade 3b toward the fixed blade 3a. Reference numeral 8 is an art fixed to the shaft 7, which swings in synchronization with the loom, rotates the movable blade 3b, and works in conjunction with the fixed blade 3a to perform wave cutting.

The blocking device 4 is composed of, for example, an air cylinder that expands based on the excitation of the coil 10, and when expanded, pushes the shaft 7 against the biasing force of a spring to move the movable blade 3b to the fixed blade 3.
The weft thread cutter 3 is separated from the weft cutter 3 to prevent the weft cutting function from occurring. Generally, a weft yarn detector is installed in a fluid injection type loom such as air. This uses, for example, an optical sensor or the like, and is attached to the downstream end of the weft flying path to detect the presence or absence of the weft at the end of the weft insertion period. The excitation of the coil 10 described in - is carried out based on a weft insertion abnormality signal which is generated from a control device (not shown) when the absence of a weft is detected. Furthermore, the drive motor of the loom is also stopped based on this signal. Incidentally, reference numeral 11 is a guide means, which includes a reed (not shown).
The weft yarn W is brought to the opening of the weft yarn cutter 3. Reference numeral 12 indicates the width i[1 of the weft insertion nozzle.
This is a clamp mechanism that holds down the weft W and applies tension to the weft W based on the weft insertion abnormality signal in a.

When the weft insertion abnormality signal is issued, the coil 10 is excited and the drive motor of the loom is also stopped.

Generally, the reed driven by the main shaft cannot be stopped immediately due to inertia, and the faulty weft yarn is already driven into the fabric by the time the main shaft comes to a complete stop. Therefore, the movable blade 3b of the weft cutter 3 is However, since the movable blade 3b is separated from the fixed blade 3a, the failed weft is not cut.

Thereafter, the main shaft is reversed to open the warp, and, for example, the weft W between the weft insertion nozzle l and the warp is pulled in the countercurrent direction by the removal rod 13, and the weft W is separated from the warp. In this case, since the weft W is clamped by the clamp mechanism 12, only the defective weft W inserted into the warp is pulled. Then, for example, the weft W is sucked by a suction device not shown, and the defective weft is removed.

[Problem that the invention seeks to solve]

By the way, this conventional weft yarn cutting device 2 has a problem in that the weft yarn cutter 3 does not cut well during normal operation, which may result in poor cutting.

This is because the shaft 7 is moved to separate the movable blade 3b from the fixed blade 3a when the weft insertion is abnormal, so when the movable blade 3b returns to its original position, the alignment between the movable blade 3b and the fixed blade 3a is This is because the weft threads may not be sufficiently sheared due to the poor quality of the weft threads. 4'ν due to the increase in speed of looms in recent years. For example, the scissors cutting motion of the weft cutter 3 is more than 600,000 times in 111.
; Therefore, if the shearing function is impaired, the loom will have to stop more frequently, making it impossible to cope with higher speeds.

Therefore, a technical problem of the present invention is to prevent the weft cutter from interlocking with the weft cut without moving the shaft when weft insertion is abnormal.

[Means for solving problems]

The technical means of the present invention for solving such problems is to provide a blocking +1- piece that allows the blocking 1F device to move into the swinging area of the weft cutter, and a blocking 1L piece in response to a weft insertion abnormality signal. It is configured to include a drive unit for advancing.

[Effect]

According to this means, when there is a weft insertion error, the blocking piece advances into the swinging area of the weft cutter by the drive unit, the swinging of the weft cutter is stopped, and the liquid cutting function is blocked. will be played.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, a weft cutting device according to an embodiment of the present invention will be described based on the accompanying drawings.

1 and 2 show a weft cutting device CI according to a first embodiment.

In the figure, reference numeral 20 indicates a weft cutter, and a fixed blade 20
a and a movable blade 20b. The fixed blade 20a is fixed to a bracket 19 attached to the frame of the loom, while the movable blade 20b is swingably supported by the bracket 19 via a rotation shaft 21. Reference numeral 22 denotes an arm of the weft cutter 20, and the rotation shaft 21 is connected to the fork portion 23 of the arm of the weft cutter 20.
Fixed. This arm 22 is always urged in the cutting direction R by a spring 25 at the other end. Further, a roller 26 as a cam follower is attached to the other end of the arm 22. A cam 27 that rotates in synchronization with the loom is engaged with this roller 26. The cam 27 is the fixed blade 20
The high part 27a sets the arm 22 in a position to open the opening between the movable blade 20b and the movable blade 20b, and at a predetermined time after the end of the reed beating Y.
the lower part 27b for setting the arm 2 in the position where the opening is closed;
It is formed by forming. The arm 22 is connected to the roller 26
While rolling from the high part 27a to the low part 27b of the cam 27, the cam 27 is swung against the biasing force of the spring 25, and while rolling from the low part 27b to the high part 27a, the biasing force of the spring 25 is This causes the fixed blade 20a and the movable blade 20b to perform a scissor cutting motion.

Reference numeral 30 denotes a barrier device, which includes a barrier 11 piece 31 and a drive section 32. The block 11-piece 31 has a pin 34 attached to a bracket 33 fixed to the frame at its intermediate portion.
It is supported by the shaft. This pin 34 is set to be located on a swing plane as a swing area of the arm 22 described above. In addition, due to the rotation of 1-31 at stop I, the one end portion 31a is located at the swing plane -H (hereinafter referred to as "stopper position A") and the position where it escapes from the swing plane (hereinafter referred to as "stopper position A"). The robot is set to be movable to the escape position (referred to as "escape position B"). One end part 3 above
The tip of the cam 1a is formed into a flat shape, and the high part 2 of the cam 27
At the stopper position A of the engagement position 7a of the blocking piece 31, this arm 22 is held at a slight distance e from the art 22.
face to face.

Further, the drive unit 32 has a shaft 36 that protrudes by excitation.
An electromagnetic actuator 37 is provided. This electromagnetic actuator 37 is attached to the bracket 33, and the protrusion of the shaft 36 pushes the other end 31b of the blocking piece 31 through a pressing piece 39 attached to its tip, thereby rotating the blocking piece 31. This is then set at stopper position A. The code 40 is a rondo, and -■
- It is slidably supported by the bracket 33 coaxially with the shaft 36, and at the pressing body 41 provided at the tip thereof, the block 11-piece 31 is blocked from the side opposite to the shaft 36.
The other end portion 31b is in contact with the other end portion 31b. Also, this rod 40
is always biased by a spring 43 so as to press the blocking piece 31 against the suppressing piece 39 of the shaft 36, and the shaft 3
6, the blocking piece 31 is rotated to set the blocking piece 31 at the escape position B. Incidentally, reference numeral 45 is a stopper that comes into contact with an engaging IF piece 46 provided on the rear end side of the shaft 36 to restrict the movement of the shaft 36.

Further, reference numeral 48 indicates a control means for exciting the electromagnetic actuator 37.

Reference numeral 49 is a detector that detects the presence or absence of a weft thread at the end of the weft insertion period; 50 is a transmitting circuit that issues a weft insertion abnormality signal based on the signal of no weft thread from the detector 49; and 51 is a transmitter that transmits a weft insertion error signal for a certain period of time based on this transmitter circuit 50. (at least the angle at which the lower part 27b of the cam 27 contacts the roller 26 (θ in FIG. 1)),
A switching circuit that excites the electromagnetic actuator 37.

52 is a power source.

Therefore, the weft cutting device CI according to the first embodiment exhibits the following effects. Now, an explanation will be given with reference to an example of the timing chart shown in FIG. 3. During normal operation of the loom, the switching circuit 51 is non-conductive, so the two pieces 31 of the stopper 11 are set to the escape position B. Therefore, immediately after the beating (0°), the roller 26 moves to the cam 27.
The arm 22 swings to the lower part 27b of the movable blade 20.
A scissors cutting motion is performed by the fixed blade 20b and the fixed blade 20a to cut the weft.

Additionally, the detector 49 detects the absence of a weft (29
0°) and a weft insertion abnormality signal is emitted from the transmitting circuit 50.
The electromagnetic actuator 37 is excited via the switching circuit 51 in response to this abnormal signal, and the blocking piece 31 is set at the stopper position A. In this case, the main shaft of the loom is
Since the cam 27 rotates due to the rotation, the cam 27 also rotates, and the roller 26 attempts to reach the lower part 27b of the cam 27. At this time, since the blocking piece 31 is set at the stopper position A, the arm 22 does not reach the lower part 27b of the cam 27 due to the biasing force of the spring 25, but moves by e and reaches the - end of the blocking piece 31. 31a. Therefore, since the arm 22 does not swing, the scissors cutting movement by the weft cutter 20 is inhibited, and the weft is not cut. Further, in this case, the arm 22 abuts against the blocking piece 31, but the pin 34 supporting the blocking piece 31
For example, 1ull +1-
Shaft 3 of electromagnetic actuator 37 instead of piece 31
When the swinging of the arm 22 is prevented by directly blocking the arm 22 on the shaft 36, the moment load acting on the pin 34 is small compared to the moment load acting on the shaft 36. minutes, 11-device 30
It has high durability. Further, in this case, since the rotating shaft 21 does not move in the axial direction unlike in the conventional case, a situation that affects the shearing function of the weft cutter 20 is prevented.

Thereafter, when the loom is stopped, the faulty weft may be removed, for example, in the same manner as described in the prior art.

4 and 5 show a weft cutting device C2 according to a second embodiment of the present invention. This differs from the weft cutting device C1 according to the first embodiment in the structure of the IF device.

This blocking device 60 has a blocking piece 61 formed into a plate shape, one end 61a of which is rotatably supported by a bracket 62 fixed to a frame.
The other end B is attracted by the electromagnet 63 as a movable part provided at the
lb on the rotation plane of the arm 22 (stopper position D)
), while the spring 64 provided on the bracket 62
When the blocking piece 61 is supported in tension and the electromagnet 63 is de-energized, the urging force of the spring 64 sets the blocking piece 61 at a position where it escapes from the swing plane (escape position E). Incidentally, reference numeral 66 indicates a plurality of holes formed in the blocking piece 61, and these holes are for reducing the weight of the blocking piece 61. Reference numeral 67 is provided on the bracket 62,
This is a hook-shaped guide that regulates the amount of swing of the blocking piece 61.

Furthermore, the electromagnet 63 is excited by the same control means as in the first embodiment.

Therefore, according to this embodiment, in response to the weft insertion abnormality signal, the blocking piece 61 is set to the stopper position, and the swinging of the arm 22 is reduced to l! [1, +t.

〔Effect of the invention〕

As explained above, according to the weft cutting device of the present invention, the swing shaft of the weft cutter can be cut without moving in the axial direction.
Since the liquid cutting function can be made into a river, it is possible to prevent the situation where the shearing function is affected by the liquid cutting movement, and therefore it is possible to prevent poor cutting by the weft cutter.

[Brief explanation of drawings]

FIG. 1 is a front view showing a weft cutting device according to a first embodiment of the present invention, FIG. 2 is a partial sectional view corresponding to the line ■-■ in FIG.
FIG. 3 is a diagram showing an example of a timing chart of a device according to this embodiment, FIGS. 4 and 5 are front and side views showing a weft cutting device according to a second embodiment of the present invention, and FIG. The figure is a perspective view of essential parts showing an example of a conventional weft cutting device. 2, CI, C2... Weft thread cutting device 3.20... Weft thread cutter 4.30.60... Blocking device 31.61... Blocking piece 32... Drive unit 63... Electromagnet (drive Department)

Claims (1)

[Claims] A weft cutter (which performs scissor cutting motion while swinging in synchronization with the loom)
20) and a blocking device (30) (60) that blocks the scissors cutting function described above based on a weft insertion abnormality signal, the blocking device (30) (60) prevents the weft cutter from swinging. Blocking pieces (31) (61) that can advance into the area;
A drive unit that advances the blocking piece in response to a weft insertion abnormality signal (
32) A weft cutting device (C1) (C2) in a shuttleless loom comprising (63).