JPH0426467Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a removal device for removing defective yarn from the weft insertion side without cutting it on the weft insertion side when a weft insertion failure occurs, and in particular to a removal device for removing the defective yarn from the weft insertion side without cutting it on the weft insertion side. The present invention relates to a release device that promptly displaces the weft thread from the operating range of a cutter for cutting the weft thread when the weft thread occurs.

Prior Art The applicant for utility model registration has already proposed a defective yarn removing device, which is the basis of the present invention, in the specification of Japanese Patent Application No. 89720/1983. In this device, when a weft insertion failure occurs, a guide nozzle uses an air flow to guide the weft yarn to the winding device side, and also to prevent the weft yarn from being cut on the weft insertion side by letting it escape from the cutter for cutting the weft yarn. I have to. However, in the above device, the function of guiding the weft yarn to the winding device side and the function of releasing the weft yarn from the cutter are achieved simultaneously by using one guide nozzle, so that the weft yarn is sufficiently removed from the cutter for cutting the weft yarn. There was a problem that it took a long time to move the object away from the object. That is, in order to reliably guide the weft to the winding device side, the guide nozzle must be installed as close to the tip of the weft inserting nozzle as possible, but in this case the distance between the guide nozzle and the cutter increases, and the guide The displacement of the weft yarn due to the air jet from the nozzle extends to the working area of the cutter, and it takes a considerable amount of time until the weft yarn is finally moved sufficiently away from the working area of the cutter. In addition, as looms become faster, the time from when a defective weft insertion is detected to when the defective yarn is struck and cut on the weft input side is also becoming shorter. was cut off despite the operation of the guide nozzle.
When the defective yarn is cut on the weft insertion side, the defective yarn removal device is unable to remove the defective yarn from the front of the weave. Therefore, in order to prevent the weft thread from being cut, it is necessary to increase the jetting pressure of the guide nozzle or set the jetting direction accurately to shorten the time required for weft thread displacement. There was a limit to that.

Purpose of the invention Therefore, the purpose of the present invention is to actively displace the weft thread near the cutter for cutting the weft thread out of the operating range of the cutter when a weft insertion failure occurs, and to prevent the weft thread from being cut by the cutter. The object of the present invention is to reliably avoid this problem and ensure that the defective yarn can be removed from the front by a subsequent removal device.

Therefore, the present invention provides an auxiliary nozzle dedicated to cutter relief near the cutter for cutting the weft thread, in addition to the guide nozzle, and injects air from the auxiliary nozzle when a weft insertion failure occurs. The weft thread in the working area of a cutter for cutting the weft thread is positively and quickly displaced to the non-working area.

Structure of the invention FIGS. 1 to 3 show the mechanical structure of a defective yarn removing device 1, which is the premise of the invention. This defective yarn removing device 1 includes a guide nozzle 2, a cutter 3, and a removing device 4 as main parts.

The guide nozzle 2 is located between the weft insertion nozzle 5 and the weft insertion side end of the woven fabric 6 on the yarn feeding side, and is directed in a direction away from the flying path, for example, diagonally upward. Further, the cutter 3 is provided, for example, at the tip of the weft insertion nozzle 5, near the cylindrical yarn guide 7. These cutters 3
The yarn guide 7 and the weft insertion nozzle 5 are mounted on, for example, a reed holder 59.

Further, a cutter 58 for cutting the weft thread is fixedly attached to the weft-feeding side end of the woven fabric 6 by a cutter holder 65. This cutter 58
is achieved by a cam mechanism that synchronizes with the rotation of the loom.
After the weft insertion is completed, the weft thread 56 is cut at that position so that the weft thread 56 on the weft insertion nozzle 5 side can be inserted in the next cycle. and,
Cutter relief device 60 for cutting weft thread of the present invention
The auxiliary nozzle 61 is located near this cutter 58.
A solenoid valve 63 is also provided to control the pressure air to the auxiliary nozzle 61. That is, this auxiliary nozzle 61 is fixed to, for example, a cutter holder 65, is arranged from the axis of the cutter 58 toward the cutting edge, and is connected to the solenoid valve 6.
3 to a pressurized air source 62. Note that this pressure air source 62 is also connected to the guide nozzle 2 via a solenoid valve 64.

The extraction device 4 rotatably supports a winding body 9 and a rotating body 10 inside a cylindrical housing 8. The winding body 9 is the rod 1
Stroke bearing 18 in housing 8 at 7
The blow nozzle 12 is integrally formed at the center position of the tip, and a conical winding surface 13 is formed at the outer peripheral portion. ing. The blow nozzle 12 reaches a liquid intake connector 16 attached to the housing 8 and the slide bearing 11 through a communication hole 14 and a communication groove 15 on the outer periphery. Moreover, this rolled body 9 is
A rod 17 is integrally formed at the center of the rear end portion. This rod 17 is supported slidably in the axial direction by a stroke belling 18 in the housing 8, and its tip corresponds to a pressing body 22 fixed to a piston rod 21 of a pressing cylinder 20. . This rod 17 is always biased to the right by a coil spring 24 provided between a sleeve 19 also serving as a spring receiver and a spring receiver 23 at the tip of the rod 17. The amount of rightward movement of the roll 9 is regulated by the roll 9 and the corresponding cap 25. The amount of leftward movement is determined by the contact between the rotating body 10 and the winding body 9. The sleeve 19 is rotatably supported by a ball bearing 26 inside a cap 25 attached to the tip of the housing 8.

Further, the rotating body 10 has a winding surface 13 of a conical body.
A fitting portion 28 is integrally formed with a conical recess at a corresponding portion thereof, and is rotatably supported by a ball bearing 30 inside the housing 8 by a hollow rotating shaft 29 in an extension thereof. ing. Note that this ball bearing 30 is prevented from coming off by a cover 31 attached to the opening surface of the housing 8. The inside of this rotating shaft 29 is
It serves as a discharge path 32, and its tip faces into the trash box 33. Further, this rotary body 10 is configured to mesh with a gear 34b of a drive motor 35 through a gear 34a attached thereto, receive rotational force from the drive motor 35, and be driven at a predetermined speed.

In this way, the above-mentioned winding body 9 and rotating body 10 face each other inside the housing 8 while forming an appropriate space. In this space, the housing 8 is combined with the guide tube 36 in a crossed manner. This guide tube 36 is open at the top and bottom, and communicates with the space where the winding body 9 and the rotating body 10 face each other through a guide hole 37 located substantially below the middle portion. Note that a guard plate 38 is attached to the upper opening surface of the guide tube 36, if necessary. A sensor 40 is attached near the upper guide hole 37 by a sensor attachment plate 39, as shown in FIGS. 4 and 5. This sensor 40 is composed of, for example, one light emitter 41 and two light receivers 42, which are directed toward the center of the guide hole 37.
They are attached symmetrically to each other.

Next, FIG. 6 shows the configuration of the controller 43. The sensor 40 is connected to one input terminal of a comparison circuit 45 via an amplifier circuit 44. Moreover, this comparison circuit 45 has, at the other input terminal,
It is connected to a reference value setter 55, and its output terminal is directly connected to an AND gate 47 and one input terminal of an AND gate 48 via a NOT circuit 46. Further, the first timer 49 and the second timer 50 receive the winding start signal A and the winding end signal B, respectively, and keep the winding start signal A and the winding end signal B for a certain period of time T ₁ , T _{2 .}
The output side is connected to the other input terminal of AND gates 48 and 47, respectively. These AND gates 47 and 48 are each connected on the output side to the input end of an OR gate 51, and this OR gate 51 is connected to a relay 53 via a driver 52. This relay 53 is incorporated into a circuit that generates a signal to prohibit restarting the loom or to stop the defective yarn removal operation through a relay contact 54.

Effect of the invention Next, Figure 7 shows the sequence of a series of operations.

During normal weft insertion, the weft insertion nozzle 5 pulls out the stored weft yarn 56 from, for example, a drum-type weft length measuring and storage device 66, and sequentially inserts the weft yarn into the opening of the warp yarn 57 at the weft insertion timing. After beating, the weft yarn 56 is cut by a cutter 58 to form the woven fabric 6.

However, when a weft insertion defect occurs, the loom
After receiving the "H" level horizontal stop signal, the brake is applied and the machine automatically stops in the next cycle. Such weft insertion defects are detected at the weave end portion on the reaching side of the weft yarn 56 by a known weft filler or the like.

On the other hand, when the control unit 69 receives the weft stop signal, the control unit 69 controls the weft length measuring and storage device 66 by an operation command.
The operation unit 68 is driven to unwind the weft thread 56 by retracting the locking pin 67, thereby making it possible to supply the weft thread 56 of the length required for cutter release to the weft insertion nozzle 5. In this embodiment, the length of the weft yarn 56 that can be unwound is at least the length that allows the weft yarn 56 to be bent (slack) for cutter release, but from the viewpoint of removing the defective yarn 56a, It has a length necessary to reach the guide hole 37 of the extraction device 4. In the case of the embodiment of the drum-type weft length measuring and storage device 66, the required length is:
The locking pin 67 can be used to obtain, for example, one turn of the weft yarn 56 by unwinding it on a drum. This can be achieved by operating a clamper in the opening direction for a predetermined period of time on the upstream side of the insertion nozzle 5 to temporarily release the holding of the weft yarn 56.

Furthermore, when the weft stop signal is input, the control unit 69 instantaneously turns on the solenoid valves 63 and 64 according to an operation command, and sets them in the open state. For this reason,
The guide nozzle 2 and the auxiliary nozzle 61 inject air from their tips to cutter 58 at the end of the woven fabric 6.
Unravelable weft yarn 5 to avoid cutting by
6 from the weft length measuring storage device 66 side, and the pulled out part of the weft thread 56 is wiped between the weft inserting nozzle 5 and the woven fabric 6 to make it into a bent (slack) state, and then the weft thread 56 is removed from the cylinder of the pulling device 4. It is moved toward the inside of the shaped yarn guide 7. In this case, the guide nozzle 2 mainly guides the weft yarn 56 into the yarn guide 7, and the auxiliary nozzle 61 guides the weft yarn 56 into the yarn guide 7 by a short-time jet.
is in a bent (slack) state, and the cutter 58 is actively and quickly displaced from the operating range to the inactive range.

At the same time, the winding body 10 takes in compressed air from the outside and injects the air from the blow nozzle 12 toward the discharge path 32 of the rotating body 10.
Negative air pressure is generated nearby. As a result, the weft yarn 56 enters the inside of the guide tube 36 and then enters the inside of the discharge path 32 through the guide hole 37. During this time,
Although the cutter 58 is performing a cutting operation, the weft thread 56 is not cut because the weft thread 56 is displaced from the position of the cutter 58 due to the action of the auxiliary nozzle 61 as described above. As a result, the weft yarn 56 remains connected between the weft insertion nozzle 5 and the woven fabric 6.

During this time, the loom comes to a complete stop in the next cycle, and then automatically reverses to open the front 6a of the defective yarn 56a. At this point, the guide nozzle 2 stops jetting air, but the winding body 9
continues jetting compressed air from its blow nozzle 12 for a while.

While air is being injected from the blow nozzle 12, the press cylinder 20 is operated to move the piston rod 21 forward, causing the rod 17 to be moved by the press body 22 as shown in FIGS. 1 and 2. Move it to the left against the coil spring 24. Therefore, the conical winding surface 13 of the winding body 9 comes into pressure contact with the conical fitting portion 28 of the rotating body 10, and holds the weft yarn 56 in a sandwiched state therebetween. At the same time, cutter 3
operates to cut the weft yarn 56 near the weft insertion nozzle 5 between the weft insertion nozzle 5 and the yarn guide 7.

Thereafter, the drive motor 35 automatically starts upon receiving the start command, and gives rotational motion to the rotating body 10 . At this time, the winding body 9 has its winding surface 1
3 and the fitting part 28, it receives a frictional rotational force and rotates at the same speed as the rotating body 10, and the weft thread 56 is sequentially wound around its outer periphery. By this winding, the defective yarn 56a
is pulled out from the front 6a of the woven fabric 6. In this pulling process, the direction in which the defective yarn 56a is pulled out is set closer to the opening of the warp yarn 57 than the extension line of the front 6a, and in a direction that does not rub against the warp yarn 57, so that the defective yarn 56a It is pulled out with small resistance while being pulled away from the front 6a towards the opening side. Such defective yarn 56a
The take-up direction is determined by the installation position of the yarn guide 7,
Alternatively, when this yarn guide 7 is not installed, the installation position of the pulling device 4, that is, the pulling direction is regulated. This is possible by setting the installation position of the guide tube 36 closer to the opening than the extension line of the front 6a.

In this way, the winding body 9 and the rotating body 10
The defective yarn 56a is wound into a coil around the outer periphery of the winding surface 13. After a certain period of time has elapsed during this winding operation, the drive motor 35 automatically stops. Also, prior to that, the press cylinder 20
Since the piston rod 21 is moved backward, the winding body 9 is moved in the backward direction by the coil spring 24, and the conical winding surface 13 is moved away from the fitting part 28. At the same time, the blow nozzle 12 injects air again, and the winding surface 13
The defective yarn 56a wound around the fitting part 28
The inside of the hollow rotating shaft 29,
That is, it is discharged into the trash box 33 via the discharge path 32. Such defective yarn 56a
When the weaving operation is completed, the loom automatically reverses itself by the necessary angle, and then receives an automatic operation command and begins normal weaving operations.

During this series of removal operations, the sensor 40
Entry of the defective yarn 56a into the guide hole 37 is photoelectrically detected, and a detection signal E is generated. This detection signal E is then amplified by the amplifier circuit 44 and inputted to one input terminal of the comparison circuit 45.
Therefore, this comparison circuit 45 compares a preset reference value F and the detection signal E, and generates a comparison signal G of "H" level when the thread is present.
This is sent to the AND gate 48 while being inverted by the NOT circuit 46.

On the other hand, the first timer 49 receives the winding start signal A at the "H" level at an appropriate timing.
A timer signal C at "H" level is output for a predetermined time T ₁ and is applied to the other input terminal of the AND gate 48 . Therefore,
While the timer signal C is at "H" level, if the comparator circuit 45 outputs a threadless state, that is, "L"
When the level comparison signal G is output, the AND gate 48 generates an “H” level output signal and drives the driver 52 via the OR gate 51. Therefore, the relay 53 has its relay contact 5
By closing 4, a command is issued to the control device of the loom to prohibit restarting or to stop removing defective yarn, thereby stopping the winding operation. This condition corresponds to a thread guide failure or a thread breakage accident.

Further, the second timer 50 keeps the timer signal D at "H" level for a predetermined time _T2 at the time when the winding end signal B is received after the end of the winding operation.
is occurring. When this timer signal D is at the "H" level, when the comparator circuit 45 outputs an output indicating the presence of yarn, that is, a comparison signal G at the "H" level, the relay 53 is operated in the same way as described above. By closing the relay contact 54, the above-mentioned restart prohibition or defective yarn removal operation stop command is issued. This condition corresponds to yarn winding failure or yarn breakage.

The winding start signal A and the winding end signal B are set to be generated, for example, at the time when the drive motor 35 is turned on or off.

Modifications of the Idea Although the above embodiments illustrate the shearing type cutter 58, this may also be a heat-cutting type. In addition, the extracting device 4 may be of other types, for example,
-1728 or the device of Utility Model Application No. 1191/1986 may also be used.

Effect of invention The present invention provides the following unique effects.

An auxiliary nozzle dedicated to cutter release is installed near the cutter for weft thread cutting, and this auxiliary nozzle operates quickly when a yarn with a poor weft insertion occurs, thereby preventing erroneous weft thread cutting at the time of occurrence of a defective weft insertion yarn. decreases.

Furthermore, since a dedicated auxiliary nozzle is provided for cutter release, the jetting direction of the guide nozzle can be easily adjusted, and the pressure setting is lower than that of the conventional method and is sufficient. Further, since it is sufficient for the guide nozzle to perform only the function of guiding the weft yarn, and the relief effect by the air flow of the auxiliary nozzle is reliable, the amount of air consumed as a whole can be reduced.

Furthermore, the cutter relief is effected by means of an air jet, so that the guidance of the weft thread is not hindered by the air flow. For example, if this cutter release is attempted to be performed by mechanical means, although cutting of the weft thread is surely prevented, the mechanical part interferes with the weft thread, making it impossible to guide the weft thread smoothly as it should.
Also, when the auxiliary nozzle injects air, the weft thread is always swept away to the inactive area near the weft thread cutting cutter. For example, even if the timing for detecting the occurrence of a defective weft thread is 290 degrees, and the cutting timing of the cutter is in the range of 10 to 20 degrees in the next cycle, the weft thread will have been sufficiently displaced to the non-operating area during that time. Therefore, it is possible to reliably prevent erroneous cutting at the time when a defective weft insertion yarn occurs.

[Brief explanation of drawings]

Fig. 1 is a plan view of the weft thread cutting cutter release device of the present invention, Fig. 2 is a vertical sectional view of the device, Fig. 3 is a side view of the main part, Fig. 4 is an enlarged sectional view of the sensor attachment part, FIG. 5 is an enlarged front view of the sensor, FIG. 6 is a block diagram of the controller, and FIG. 7 is a time chart during operation. 1... Defective yarn removing device, 2... Guide nozzle, 3
... cutter, 4 ... extraction device, 5 ... horizontal insertion nozzle, 6 ... woven fabric, 36 ... guide tube, 37
...Guide hole, 40...Sensor, 43...Controller, 56...Weft thread, 56a...Defective thread, 57...
... Warp thread, 60 ... Weft thread cutting cutter relief device, 61 ... Auxiliary nozzle, 62 ... Pressure air source,
63, 64...Solenoid valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A control unit 69 that outputs an operation command before the cutter 58 for cutting the weft thread is operated in response to a detection signal of a weft insertion failure, and a cutter release unit that receives the operation command from the control unit 69 A weft length measuring storage device 66 is provided near the cutter 58, and is installed in the vicinity of the cutter 58 to remove the weft thread 56 in the working area of the cutter 58 to a non-working area by means of air injection. A weft thread cutting cutter release characterized by comprising: an auxiliary nozzle 61 to be displaced; and a solenoid valve 63 that supplies compressed air from a pressure air source 62 to the auxiliary nozzle 61 in response to an operation command from a control unit 69. Device 60.