JP2560569B2 - Weft processing device for shuttleless loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft processing device for a shuttleless loom. More specifically, the present invention relates to a weft processing device that cuts a miss weft caused by a weft insertion error or the like in a shuttleless loom such as an air jet loom in the vicinity of the tip of the main nozzle. The present invention relates to a weft processing device having improved reliability such as durability.

[0002]

2. Description of the Related Art A miss weft cutting device for cutting a miss weft in the vicinity of a main nozzle has hitherto been disclosed, for example, in Japanese Unexamined Patent Publication No. 62-184146 and Japanese Utility Model Laid-Open No. 62-1.
As disclosed in Japanese Patent No. 29084, etc., a weft cutting member (scissors) and its driving device are provided near the tip of a main nozzle on a sley that swings with respect to a machine base.

In the devices disclosed in these prior art documents, since the cutting member is arranged in the vicinity of the main nozzle, the miss weft can be surely cut. However, since the driving device for the cutting member is attached to the swinging portion (sley), the weft cutting member is swung at a high speed together with the sley, which causes a problem in durability, and also increases the speed of the swinging member.
Therefore, it also hinders the speedup of the loom.

Further, in Japanese Patent Laid-Open No. 63-112753, both a weft cutting member (scissors) and a driving device are provided in a fixed portion (non-oscillating portion) of a loom body, and the cutting member is used as a main nozzle at the time of cutting a miss weft. A device is disclosed that advances to the vicinity of the tip and cuts the miss weft.

In this device, since the weft cutting member is provided in the non-oscillating portion, there is little concern about the durability associated with the above-mentioned prior documents, but a moving mechanism for the weft cutting member is required, and the device is There is a problem in that it becomes large and installation space is large. Further, it is difficult to control the weft cutting member to advance to the vicinity of the tip of the main nozzle with high accuracy. As a result, the weft tends to be cut at a distance from the tip of the main nozzle due to lack of certainty in cutting, and the tip of the weft protrudes from the tip of the main nozzle for a long time after cutting, causing a weft insertion error during the next weft insertion. There is a problem of doing.

[0006]

As described above, in certain prior arts, the certainty of cutting is increased by providing the weft cutting member on the sley, but the drive part of the cutting member swings together with the sley. There is a durability problem of being damaged by doing so.On the other hand, the durability problem is solved by providing the weft cutting member in the fixed portion, but the cutting reliability is improved because the cutting member is located away from the main nozzle. There is a problem of chipping.

[0007]

SUMMARY OF THE INVENTION The present invention solves the problem of durability represented by breakage due to the presence of the weft cutting member on the sley, which is associated with the above-mentioned prior art, and miss yarns due to the arrangement of scissors near the main nozzle. An object of the present invention is to provide a weft processing device that can achieve both of the tasks of ensuring cutting reliability.

The inventor of the present invention pays attention to that the miss weft cutting device operates only when there is a mistake such as a weft insertion error, and when the miss weft cutting device operates, cuts the miss yarn at a position as close as possible to the tip of the main nozzle. Therefore, the present invention has been conceived, paying attention to the fact that weft insertion error does not occur at the time of restart.

[0009]

In the present invention, a weft cutting member is arranged on a sley near the tip of the main nozzle,
A drive unit for driving the weft cutting member is arranged on the machine body side independently of the weft cutting member, and a positional relationship is set between the drive unit and the weft cutting member so that the weft cutting member can be engaged when the weft is cut. The above object is achieved by the weft processing device of the shuttleless loom.

[0010]

In the present invention, since the weft cutting member is arranged on the sley in the vicinity of the main nozzle, the weft cutting member can be arranged sufficiently close to the outlet portion of the main nozzle to prevent The length can be shortened sufficiently. Further, in the present invention, since the drive unit for driving the weft cutting member is arranged not on the swing member such as the sley but on the machine main body, damage to the drive unit of the weft cutting member due to the swing of the sley can be prevented. .

In the present invention, the drive portion of the weft cutting device is arranged to be engageable with the weft cutting member at the operating position of the weft processing device. Therefore, the weft cutting member can be operated by operating the drive unit, and thus the weft can be reliably cut.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view of a weft processing apparatus according to the present invention, in which the duct shown in FIG. 2 is omitted. FIG. 2 is a front view of the weft miss yarn processing apparatus shown in FIG. FIG. 3 is a front view of an air jet loom to which the device of the present invention is applied.

The air jet loom sley 16 shown in FIGS. 1, 2 and 3 swings along the machine base, and the sley 16 is provided with a main nozzle 14. Although the main nozzle 14 of the illustrated embodiment is for multiple colors, the present invention can also be applied to a single main nozzle. A reed 13 is provided in front of the main nozzle 14 of the sled 16. The reed 13 of this embodiment is a so-called deformed reed in which a recess is formed in the reed wing and the recess is aligned in the weft insertion direction to form a weft guide passage.

In FIG. 3, the weft Y supplied from the weft measuring and storing device 34 is guided into the main nozzle 14, and the weft guide passage of the reed 3 along with the fluid jetted from the main nozzle 14 in synchronization with the weft insertion timing ( Weft insertion in (not shown). Main nozzle 1 which is beaten and woven into woven fabric
The weft cutting device 35, which cuts the weft Y connected to the No. 4 every time the weft is inserted, is the main nozzle 1 at a position corresponding to the cloth fell.
It is arranged on the four sides. A weft detector 36 is provided at the end of the sley 16 on the side opposite to the main nozzle.
When the weft insertion error is detected, the air cylinder 37 protrudes to hold the weft cutting device 35 in an inoperative state, and the defective weft 15 woven before the weaving of the woven fabric is connected to the main nozzle 14 side without being cut. It is designed to be held in a state.

Above the main nozzle 14, a weft introduction duct 7, an air guide 39 and a suction duct 40 are arranged. The blow nozzle 12 is provided below the weft insertion path in front of the main nozzle 14. The blow nozzle 12 is directed to the inlet 7a of the weft introduction duct 7. A drive roller 43 and a pressing roller 45 are provided between the weft introduction duct 7 and the air guide 39. The drive roller 43 is driven by the motor 42, and the pressing roller 45 is the air cylinder 4
4 to move it to the working position where it is pressed against the drive roller 43 and the retracted position which is separated from the drive roller 43. A weft yarn detector 46 is arranged at a position between the air guide 39 and the suction duct 40.

A device 35 for cutting the weft thread that has been put in the steady weft
The air cylinder 37 for projecting the air is communicated with the air tank 51 via the solenoid valve 47, and the blow nozzle 12 is connected to the solenoid valve 4
8, the suction duct 7 communicates with the air tank 51 via the solenoid valve 49, and the air cylinder 44 communicates with the air tank 51 via the solenoid valve 50.

The defective weft yarn 15 introduced into the weft yarn introduction duct 7 by the pressure air blown from the blow nozzle 12 reaches the suction duct 40, is gripped between the rollers 43 and 45, and is rotated by the rotation of the rollers 43 and 45. Suction duct 40
It is taken to the side.

The cutting blades 1 and 2 are disposed directly above the injection port of the main nozzle 2, and are used when the weft yarn introduced into the weft introduction duct 7 is taken by the action of both rollers 43 and 45. It is designed to be cut by 1 and 2. That is, as shown in FIGS. 1 to 3, the sley 16 is provided with the bracket 5 via the cutter holder 6. The bracket 5 has an L shape as shown in FIG. 1, and one end of the L shape is a protruding piece 5a. A fixed upper blade 1 of the cutter is fixedly installed on the lower surface of the bracket 5.

Further, the bracket 5 has a small hole 5b penetrating the upper and lower surfaces thereof, and a pin 19 is rotatably penetrated from the lower part of the bracket 5 into the small hole 5b. As shown in FIG. 2, the movable lower blade 2 of the cutter is integrally fixed to the lower end of the pin 19.

The cutter lever 3 is fixed to the upper end of the pin 19 penetrating the small hole 5b. That is, the cutter lever 3 has a J shape, and the pin 19 is fitted into the J-shaped arc portion and the bolt 20 (FIG. 1) is fastened to fix the cutter lever 3 to the pin 19.

Between the protruding piece 5a of the bracket 5 on which the fixed upper blade 1 of the cutter is fixedly set and the recess 3a formed at the tip of the cutter lever 3, the protruding piece 5 of the cutter lever 3 is provided.
A return spring 4 that urges in a direction away from a is interposed, and the return spring 4 causes the fixed upper blade 1 of the cutter and the movable lower blade 2 of the cutter to be in an open position in a steady state. Further, the movable lower blade 2 of the cutter is rotated toward the fixed upper blade 1 side by pushing the cutter lever 3 against the urging force of the return spring 4 toward the protruding piece 5a. The rotating region of the movable lower blade 2 is set so as to intersect with the path of the weft yarn introduced into the duct 7 by the blow nozzle 12, and the weft miss yarn 15 is cut between the fixed blade 1 and the movable lower blade 2. You can

The cylinder bracket 10 having an L-shape with the tip 10a bent is corresponding to the sled position retracted to the operating position (for example, a position of about 180 ° at the crank angle of the loom) of the weft processing apparatus described above. It is fixedly provided on the machine base by 11, and a fluid pressure cylinder 8 such as an air cylinder is inserted into a hole formed in the L-shaped tip of the cylinder bracket 10 and a pair of nuts 21 are fastened and fixed. ing. A cylinder cap 9 having a hemispherical tip is fixed to the tip of the piston rod 8a of the air cylinder 8.

Normally, even when the sley 16 is retracted to the operating position of the weft processor, there is a slight gap between the spherical tip of the cylinder cap 9 and the cutter lever 3. In this state, by operating the cylinder 8 and advancing the cylinder cap 9, the cylinder cap 9 presses the cutter lever 3 and swings the movable lower blade 2 of the cutter around the axis of the pin 19, which causes the horizontal movement. The miss thread 15 can be cut.

In the embodiment of the present invention having the above-mentioned structure, when the weft detector 36 detects the occurrence of a weft insertion error or the like, the weft insertion device is arranged at the end portion of the woven cloth on the weft insertion side, and the woven cloth and the main nozzle are in normal operation. Cutter 3 that cuts the weft yarn with 14
5 (FIG. 3) is deactivated.

After that, the machine base makes about one rotation due to inertia.
During that time, the electromagnetic pin 34a holds the engagement state with the yarn winding surface of the weft measuring and storing device 34 to prevent weft insertion of the weft yarn following the weft insertion error yarn.

Then, the electromagnetic valves 48 and 49 are operated to inject the air flow from the blow nozzle 12 and generate the suction flow in the suction duct 40. Along with that, electromagnetic pin 3
4a unwinds one pick of weft, and the unwound weft is guided to the suction duct 40 through the duct 7 and the air guide 39, and the machine base is connected to the weft, for example, the crank. It is stopped at an angle of about 300 °.

Then, automatically or manually, the machine base is thrown in by slow inching to reverse the rotation so that the warp yarns having a crank angle of about 180 ° are opened. In the steady operation state, the cylinder cap 9 of the air cylinder 8 and the cutter lever 3 face each other with a small gap even in this state.

Then, the known miss yarn processing device is activated,
The miss weft 15 blown out from the blow nozzle 12 is held by the nip rollers 43 and 45 (FIG. 3). Therefore, the tip of the miss weft 15 passes through the duct 7 and the nip roller (4
3, 45), and on the outlet side of the main nozzle 14, it is held at a position between the fixed upper blade 1 of the cutter and the movable lower blade 2 of the cutter.

In this state, a weft-missing yarn processing device actuating valve (not shown) of the present invention is manually turned on, or is turned on as a procedure for a series of weft-missing yarn processing operations, and air is supplied from the air pipe 11 '. Air is supplied to the cylinder 8, the piston rod 8a of the air cylinder is advanced together with the cylinder cap 9, and the cylinder cap 9 presses the cutter lever 3 to rotate the movable lower blade 2 of the cutter together with the pin 19 to fix the cutter. Miss weft 15 on the side connecting to the main nozzle 14 between the upper blade 1 and the movable lower blade 2.
And the only miss yarn in the fabric is the nip rollers 43, 4
It is in a state of being gripped by 5. By driving the nip rollers 43 and 45 in this state, the miss yarn 15 in the fabric is
Is pulled out and removed by the nip roller. Then, after passing through the known miss yarn processing method, the loom is restarted.

The present invention is not limited to the above-described embodiment, and the miss thread cutting member (scissors) is not limited to the one arranged above the main nozzle as described above, but may be arranged at an appropriate position. . Further, the driving device is not limited to the heald frame guide shaft (after weaving side) as in the above-mentioned embodiments, but may be provided at the weaving side or the upper side.

[0032]

According to the present invention, since the weft miss yarn cutting member (scissors) can be arranged in the closest vicinity of the main nozzle, the miss yarn can be surely cut, and the weft yarn that has come out from the tip of the main nozzle after cutting can be removed. The short length prevents the occurrence of first pick mistakes when the loom is restarted. Especially in the case of multicolor, occurrence of first pick mistakes due to clogging of the tip with other threads or entanglement with the warp sheet at the opening entrance. Can be prevented.

In the present invention, since the driving device for the cutting member is attached to the non-oscillating portion (main body side), the driving device is on the fixed side, its reliability is improved, and the inertial mass to be oscillated can be reduced, and the loom It is easy to cope with high rotation speed and the maintainability is improved.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment according to the present invention.

FIG. 2 is a front view of the embodiment shown in FIG.

FIG. 3 is a front view of an air jet loom to which the device of the present invention is applied.

[Explanation of symbols]

 1 Fixed upper blade of cutter 2 Lower movable blade of cutter 3 Cutter lever 4 Return spring 8 Air cylinder 9 Cylinder cap 13 Reed 14 Main nozzle 15 Weft thread 16 Slay

Claims (1)

(57) [Claims] 1. A weft cutting member is arranged on a sley in the vicinity of a tip of a main nozzle, and a drive unit for driving the weft cutting member is arranged on a machine body side independently of the weft cutting member, and the drive unit is provided. A weft processing device for a shuttleless loom, wherein a positional relationship is set between the weft cutting member and the weft cutting member so that the weft cutting member can be engaged when the weft is cut.