JP2679431B2 - Weft system treatment method in jet 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 treatment in a jet room, in which a weft is injected by a jetting action of a weft-inserting nozzle and the weft following a defective weft insertion is cut and eliminated from the weft-inserting nozzle. it relates to mETHODS.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. 1-282371, a weft processing apparatus has been proposed which automatically eliminates defective wefts which have been misinserted in a jet loom. According to this device, when a weft insertion error occurs, air is blown from the blow nozzle and the succeeding weft is introduced above the main nozzle while the miss yarn and the following weft are connected without being cut. The weft is introduced into the duct and the suction duct, and the trailing weft is gripped by a pair of rollers provided between the two ducts, and the trailing weft is drawn into the duct by driving both rollers, thereby removing the defective weft from the warp opening. ing.

With the take-up of the succeeding weft, the succeeding weft, which is connected to the length measuring device via the main nozzle, is tensioned between the rollers and the main nozzle, and the tensioned weft is arranged directly above the main nozzle jet port. It is pressed against the cut blade. By this pressure contact, the succeeding weft is separated from the main nozzle, and the defective weft is removed from the warp opening with the succeeding weft as a clue. The defective weft yarn pulled out from the warp shed is removed from the suction duct.

A weft processing device for pulling out and removing a defective weft by using a succeeding weft as a clue is disclosed in JP-A-61-25234.
It is also disclosed in Japanese Patent No. 2 publication. In this device, the defective weft yarn is pulled out and removed only by the air flow between the blow nozzle and the suction nozzle which face each other with the main nozzle interposed therebetween. Also, a breeze circuit with a breeze injection solenoid valve is connected to the main nozzle, and the breeze injection solenoid valve is opened and closed according to the operating state of the machine base to inject or stop the breeze from the main nozzle. There is.

It is very convenient to connect the defective weft and the succeeding weft without cutting them, but it is very convenient for pulling out and removing the defective weft. However, there is also a method of separating the both to prevent the weft insertion of the succeeding weft. This is effective in removing defective wefts. In this case as well, the succeeding weft is cut off from the main weft inserting nozzle.

[0006]

However, in both of the conventional devices, back tension is generated in the weft thread connected to the length measuring device due to the cutting by the cutting blade at the time of processing the miss thread, and the weft thread comes out from the main nozzle. There's a problem. Further, there is a problem that the back tension of the weft causes disturbance of the preliminary winding of the winding type weft measuring and storing device, and the first pick at the time of restart fails.

In the apparatus disclosed in Japanese Patent Laid-Open No. 61-252342, a fine jet control is performed in which a slight wind is blown from the main nozzle only during phase alignment of the length measuring drum at the time of weft insertion error. If minute jetting is continued during miss yarn processing, the weft yarn sucked and held in the suction nozzle will come out and accidentally enter the loop shape in the warp opening, or the weft yarn will be untwisted and blown off for a long time. Although there is a fear, the limited fine jetting as described above prevents the yarn from coming off and blowing from the suction nozzle. However, such limited fine jetting cannot prevent the influence of back tension when cutting the subsequent weft.

An object of the present invention is to prevent the weft from coming off from the weft inserting nozzle due to the weft cutting during the processing of the miss yarn and to prevent the preliminary winding yarn of the length measuring device from being disturbed.
It is to provide a weft how to process in a jet loom which is capable of processing a defective weft was weft insertion error.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is based on a weft insertion error detection signal.
Stop the loom without cutting the defective weft
A weft yarn following the defective weft yarn is also attached to the weft insertion nozzle side.
Introduced into the weft introduction duct of the weft processing device arranged in
After stopping the operation of the loom, reverse the loom and weave the defective weft.
Released only state, the weft insertion combined subsequent weft yarn from nozzle weft insertion the weft cutting timing for separating eliminate
A fluid with a pressure lower than the jet pressure at the time of weft insertion is discharged from the nozzle for use.
For back tension that occurs when the weft is cut by jetting it temporarily
Is countered, after weft, low pressure from a nozzle for the weft insertion
Stop the fluid injection and use the weft treatment device
The weft processing method is to remove the yarn .

[0010]

[0011]

[Operation] When a weft insertion error occurs, the weft insertion error detection signal
Weaving mistakes made based on weaving without cutting the defective weft
The weft following the defective weft when the machine operation is stopped
Weft guide of a weft processing device in which the yarn is arranged on the weft insertion nozzle side
It is introduced into the entrance duct. In this state weft nervous I connected to the weft measuring apparatus. The loom reverses after the loom is stopped.
And the weaving condition of the defective weft is released, and the weft insertion
Weft cutting timing to remove the trailing weft from the sledge
Jet from the weft insertion nozzle according to the
Fluid at a pressure lower than the pressure is temporarily injected. Thus, the weft yarn is urged to the ejection direction against the back tension generated during cutting, disturbance of reservoir weft is prevented in the weft measuring reservoir apparatus of the yarn exit and the winding system from the injection nozzle. Further, since the jet fluid is supplied only temporarily, blowout of the weft yarn is prevented. After cutting the weft, the weft
The injection of low pressure fluid from the charging nozzle is stopped,
The defective weft yarn is removed by the yarn processing device.

[0012]

[0013]

Embodiments 1 and 2 embodying the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIG. 1, a main nozzle 2 is fixed to one end side of a sley 1, and a reed 3 having a function of guiding a weft Y is erected in front of the main nozzle 2. There is. The weft accumulated on the yarn winding surface 4a of the winding type weft measuring and storing device 4 is introduced into the main nozzle 2 and is guided along with the fluid jetted from the main nozzle 2 in synchronization with the weft insertion timing. Weft insertion is carried out in a passage (not shown).

A weft cutting device 5 is provided on the side of the main nozzle 2 side corresponding to the cloth fell of the woven fabric, and cuts the weft yarn Y injected from the main nozzle 2 every weft insertion. An air cylinder 7 is arranged near the weft cutting device 5. The air cylinder 7 prevents the cutting start operation of the weft cutting device 5 by its protruding operation. A weft insertion error detection device 6 is arranged at the end of the sley 1 on the side opposite to the main nozzle.

A weft introduction duct 8, an air guide 9 and a suction duct 10 are provided above the main nozzle 2, and a cutting blade 22 is provided immediately above the jet port of the main nozzle 2. The suction duct 10 is a suction nozzle 10.
A jetting action from a causes a suction action. A blow nozzle 11 is installed below the front weft insertion path of the main nozzle 2 so as to face the inlet 8a of the weft introduction duct 8.

The weft introduction duct 8, the air guide 9, the suction duct 10 and the blow nozzle 11 oscillate integrally with the sley 1, and the weft introduction duct 8 and the air on the sley 1 at a swing position of a crank angle of about 180 ° and the air. A drive roller 13 and a driven roller 15 are arranged between the guide 9 and the guide 9. The drive roller 13 is driven by the take-up motor 12, and the driven roller 15 is switched between an operating position where it is pressed against the drive roller 13 by the air cylinder 14 and a retracted position separated from the drive roller 13.

A limit switch type weft yarn detector 16 is disposed at a position facing the intermediate position between the air guide 9 and the suction duct 10. The weft thread detector 16 is attached to the air cylinder 14, and when the driven roller 15 moves from the retracted position to the working position, the detection needle 1 of the weft thread detector 16 is detected.
6a sweeps between the air guide 9 and the suction duct 10.

An air cylinder 7 for preventing the cutting and opening / closing operation of the weft cutting device 5 is connected to a pressure air supply tank 21 via a solenoid valve 17. Similarly, the blow nozzle 11 is connected to the pressure air supply tank 21 via the electromagnetic valve 18, the suction nozzle 10a of the suction duct 10 via the electromagnetic valve 19, and the air cylinder 14 via the electromagnetic valve 20. . The main nozzle 2 is connected to the high pressure air supply tank 33 via the three-way joint 31 and the solenoid valve 32, and is connected to the low pressure air supply tank 35 via the three-way joint 31 and the solenoid valve 34. The high-pressure air supply tank 33 supplies high-pressure air necessary for weft insertion to the main nozzle 2, and the low-pressure air supply tank 35 supplies air having a lower pressure than the high-pressure air to the main nozzle 2.

A weft processing control box 24 is supported on an opening bracket (not shown) that supports a jack lever that moves the heddle frame 23 up and down. The control box 24 sends and receives data to and from the weaving machine control computer 25, and based on the weft detection information from the weft detector 16, the take-up motor 12 and the solenoid valve 20.
Control the operation of. Based on the weft insertion error detection signal from the weft insertion error detection device 6 and the output signal from the crank angle detection encoder 27 provided on the machine base, the loom control computer 25 determines the solenoid valves 17, 18, 19 ,. 32,3
The opening / closing operation of No. 4 and the forward / reverse rotation drive of the machine base drive motor (not shown) are controlled.

The flow charts of FIGS. 2 and 3 represent a weft-insertion mistake processing program, and the mistake weft processing when a weft-insertion mistake occurs is shown in the flow charts of FIGS. 2 and 3.
It is performed according to the timing chart of. When a weft insertion error occurs, the weaving machine control computer 25 issues a machine stand stop command based on the weft insertion error detection signal from the weft insertion error detection device 6 and also issues an opening command to the solenoid valves 17, 18, 19. As a result, the weft cutting device 5 is held in an inoperative state, air is further jetted from the blow nozzle 11 during inertial operation of the machine base, and a suction airflow is generated in the suction duct 10. Therefore, the defective weft Yb woven before the cloth is held in a state of being connected to the main nozzle 2 side, and
The weft Y1 following the defective weft Yb is introduced into the weft introduction duct 8 without being wefted, and reaches the detection area of the weft detector 16.

After the machine base is stopped (crank angle of 300 °), the machine drive motor is rotated in the reverse direction, and is oscillated about one and a half times to the position (crank angle of 180 °) where the sley 1 is finally retracted. The maximum opening is formed, and the weaved state of the defective weft Yb due to the upper and lower warps is released. With the reverse rotation of the machine stand, the solenoid valve 18 is closed, and the blow nozzle 1
Air injection from 1 stops. Subsequently, the electromagnetic valve 20 is opened to cause the air cylinder 14 to project, the driven roller 15 is switched from the retracted position to the working position, and the succeeding weft Y1 is gripped between the rollers 13 and 15.

When the driven roller 15 moves from the retracted position to the working position, the detection needle 16a of the weft detector 16 contacts the succeeding weft Y1 and the weft detector 16 is turned on. As shown in FIG. 4, the weft processing control box 24 opens the solenoid valve 34 in response to this ON signal, and air having a pressure lower than the injection pressure at the time of weft insertion is ejected from the main nozzle 2 for a predetermined time T1. It This air pressure is set so low that the succeeding weft Y1 is not blown out. The jetting time T1 is set to a short time such that the weft Y1 is not untwisted.

The drive of the take-up motor 12 is started with a slight delay from the start of injection of the low-pressure air, and the following weft yarn Y1 is taken up by the rollers 13 and 15. With this take-up operation, the succeeding weft Y1 is fed to both rollers 13,1.
5 is tensioned between the main nozzle 2 and the main nozzle 2, and in this tensioned state, the blade is pressed against the cutting blade 22 for cutting. At the moment of cutting, back tension is generated in the weft Y separated from the succeeding weft Y1, but the low pressure air jetted from the main nozzle 2 urges the weft Y in the direction opposite to the yarn returning direction due to the back tension. Therefore, the yarn does not suddenly return to the weft measuring and storing device 4 side. Therefore, the weft yarn Y is prevented from coming off from the main nozzle 2, and the disorder of the preliminary winding yarn on the yarn winding surface 4a of the weft measuring and storing device 4 is prevented.

After the cutting of the succeeding weft Y1 by the cutting blade 22 is completed, the electromagnetic valve 34 is closed and the injection of the low pressure air from the main nozzle 2 is stopped. Further, the trailing weft Y1 is drawn into the suction duct 10 by the suction action of the rollers 13, 15 and the suction duct 10, and the defective weft Y on the cloth is
b is withdrawn from the warp opening following the succeeding weft Y1. When all the defective wefts Yb pass between the roller pairs 13 and 15, the detection needle 16a of the weft detector 16 returns to the OFF position. The weft processing control box 24 measures the pull-out length of the defective weft Yb based on the rotation amount information from the rotary encoder 12a from the start of the operation of the take-up motor 12 to the time when the weft detector 16 is turned off.

If the drawn length is equal to or longer than the set length,
The weft processing control box 24 determines that the weft processing is successful, and outputs an operation restart signal to the loom control computer 25. Based on the operation restart signal from the weft processing control box 24, the loom control computer 25 determines the position most suitable for restarting the machine base,
That is, the machine base is reversed to the position where the crank angle is 300 °.
Further, after closing the solenoid valve 17 to return the weft cutting device 5 to the operable state, the machine base is automatically restarted.

When the length of the defective weft Yb is shorter than the set length, such as when a cutting accident occurs while the defective weft Yb is being drawn out, the weft processing control box 24 gives a weft processing unsuccessful signal from the weaving machine control computer. 25, and the abnormality display lamp 26 blinks. On the basis of the unsuccessful weft processing signal, the loom control computer 25 causes the machine drive motor to rotate in the forward direction to crank the machine at a crank angle of 300 °.
Wait at the position. After that, the defective weft is removed manually by the operator under the maximum opening of the crank angle of 180 °, and then the restart operation is performed.

In this embodiment, since the warp opening is closed, that is, the warp tension is small, until the operator removes the defective weft and restarts the warp, the warp may be stretched. Therefore, a situation in which a stop step occurs in the woven fabric after the restart is prevented. When the machine base is in the mouth-closed state with a crank angle of 300 °, the normal rotation drive is performed to prevent the warp from gripping the weft.

(Embodiment 2) The construction of Embodiment 2 shown in FIG. 5 is substantially the same as that of Embodiment 1, but the construction of the air supply system to the main nozzle 2 is different. That is, the three-way joint 38 is provided between the air cylinder 14 and the solenoid valve 20, and the main nozzle 2 includes the three-way joint 37 and the solenoid valve 3.
It is connected to the high pressure air supply tank 33 via 2.
Further, the main nozzle 2 has a pressure air supply tank 21 including a solenoid valve 20, a three-way joint 38, a check valve 39, and a three-way joint 3.
7 are connected. The air pressure of the pressure air supply tank 21 is set lower than the air pressure of the high pressure air supply tank 33.

Therefore, as shown in the timing chart of FIG. 6, when the solenoid valve 20 is opened, the main nozzle 2 is supplied with air from the pressure air supply tank 21 in synchronization with the switching of the driven roller 15 to the operating position. Inject low-pressure air. Therefore, low pressure air is jetted from the main nozzle 2 at least before and after the weft cutting timing by the cutting blade 22, and the weft Y is the same as in the first embodiment.
Is urged by the back tension in the direction opposite to the thread return direction.

According to this structure, it is not necessary to provide the low-pressure air supply tank 35 exclusively for supplying low-pressure air as in the first embodiment, and the entire apparatus can be greatly simplified .

(Other Example) The present invention is not limited to Examples 1 and 2 above,
You may implement in the following modes. That is, (1) in a jet loom equipped with a cutting blow air supply system for supplying air to the main nozzle 2 when the weft cutting device 5 cuts the weft that has been successfully inserted, a cutting blade at the time of weft insertion error processing. 22 following weft yarn Y
Supplying air from the cutting blow air supply system to the main nozzle 2 at the cutting timing of 1. (2) In a jet loom equipped with a tandem nozzle for assisting weft insertion in front of the main nozzle for weft insertion, air that opposes the back tension is jetted from the tandem nozzle at the timing of cutting the succeeding weft Y1 by the cutting blade 22. thing. (3) Use an open / close cutting device instead of the cutting blade 22. (4) The present invention is applied to a weft processing device that separates the defective weft Yb from the succeeding weft Y1 and prevents the weft insertion of the succeeding weft Y1 so that the succeeding weft Y1 is separated from the main weft inserting nozzle. (5) The present invention is applied to a weft processing device that inserts the succeeding weft Y1 and pulls out and removes the defective weft Yb from the trailing end side with the succeeding weft Y1 as a clue.

[0032]

As described above in detail, according to the present invention, the weft-inserting nozzle wefts at the timing of weft cutting for separating and removing the succeeding weft from the weft-inserting nozzle.
Since than the injection pressure during brewed as pairs to anti back tension occurring during temporary injection to <br/> weft low pressure fluid, prevents the weft comes off from the nozzle weft insertion by weft In addition, it is possible to prevent the preliminary winding yarn of the length measuring device from being disturbed and to prevent the weft yarn from being blown out, and it is possible to process the defective weft yarn which is misinserted.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a first embodiment embodying the present invention.

FIG. 2 is a flowchart showing the first half of the defective weft processing procedure of the first embodiment.

FIG. 3 is a flowchart showing the latter half of the defective weft processing procedure according to the first embodiment.

FIG. 4 is a timing chart in a defective weft processing operation of Example 1.

FIG. 5 is a schematic diagram showing the configuration of a second embodiment of the present invention.

FIG. 6 is a timing chart in a defective weft processing operation of Example 2.

[Explanation of symbols]

The main nozzle as nozzle 2 weft insertion, 4 weft measuring reservoir apparatus, the weft introducing duct constituting the 8 weft processing apparatus 21 pressure air supply tank, 24 weft yarns processing control box, 25 weaving machine control computer, 35 low Compressed air supply tank, Y weft, Y1 succeeding weft, Yb defective weft.

Claims (1)

(57) [Claims] 1. When the weft insertion is performed by the jetting action of the weft insertion nozzle and a weft insertion error occurs, the cutting action of the defective weft is made inoperative, and the defective weft follows the defective weft after the operation of the loom is stopped. Defective weft yarn which has been miss-inserted based on a weft-insertion error detection signal in a jet loom in which the weft yarn is cut and the defective weft yarn is removed by a weft-handling device.
Stop the operation of the loom without cutting the
Wefts in which weft yarns following good weft yarns are arranged on the weft insertion nozzle side
Introduce it into the weft introduction duct of the yarn processing device, stop the operation of the loom, and then reverse the weaving machine to weave in the defective weft.
The weft insertion nozzle is released from the weft insertion nozzle at the same time as the weft cutting timing to release the trailing weft from the weft insertion nozzle.
Temporarily injected is countered back tension generated during weft <br/> yarn cutting the low pressure fluid than the injection pressure when being, after weft, injection of low pressure fluid from the nozzle for the weft insertion
And then removing the defective weft by the weft processing device .