JPH0651944B2 - How to remove defective yarn from shuttleless loom - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for removing a defective yarn from a warp yarn opening when the weft insertion is defective.

[Conventional technology]

As a technique for removing defective yarn, there is a device in Japanese Utility Model Publication No. 56-17503. The idea is to separate the weft thread that has not been wefted in a free state by separating it from the weave, and then use the nozzle on the weft insertion side and the suction means on the arrival side to re-wet the weft thread into the opening in a normal state. ing.

In the above invention, the weft yarn once beaten as the defective weft-insertion yarn is woven again as the woven fabric, which may be unfavorable in terms of the quality of the woven fabric.

On the other hand, in the invention of Japanese Patent Laid-Open No. 59-21757, when the weft insertion is defective, the weft yarn is separated from the front of the woven fabric and then the defective yarn is woven by the suction action of the suction nozzle and the winding action of the waist roller. It shows that it is extracted from

However, in that invention, prior to the collection of the defective yarn,
A step of separating the defective yarn from the front of the woven fabric is indispensable, and for that reason, a separation means having a special structure is required.

Therefore, the patent applicant has proposed an “incomplete weft-insertion yarn removing device” (Japanese Patent Application No. Sho 60) for the purpose of easily pulling out a defective yarn from the weaving cloth without using a special separating means as in the above-mentioned prior art. No. 089720) has already been proposed. When the weft insertion failure occurs, that is, when the weft stop signal is issued, the removal device displaces the weft thread connected to the defective thread to a position off the flight path by the guide nozzle near the weft insertion nozzle. After avoiding the cutter on the yarn feeding side and guiding the weft yarn to the winding device,
After cutting the weft thread at the tip side of the weft insertion nozzle,
By winding the defective yarn with the winding device, the defective yarn is pulled out while being pulled from the front of the weave toward the opening.

By the way, if the winding speed, that is, the drawing speed of the defective yarn is constant when the defective yarn is wound by the winding device, there are the following disadvantages. That is, when the drawing speed is relatively high, the drawing tension of the weft thread also becomes large, and the defective thread may break during the drawing during the drawing. On the other hand, if the pulling speed is set low to prevent such breaks in the middle, the time required to pull out the defective yarn increases, and the time required to restart the loom also increases accordingly. , The work efficiency as a whole decreases.

Therefore, Japanese Patent Laid-Open No. 62-45757 proposes to switch the weft thread withdrawing speed according to the withdrawal resistance. However, according to the technique, since the speed switching is adjusted stepwise, the speed change is not smooth, the tension of the weft thread suddenly changes, and the effect of preventing thread breakage is insufficient.

[Object of the Invention]

An object of the present invention is to enable quick removal of a defective yarn when pulling out the defective yarn without breakage of the yarn.

[Outline of Invention]

Therefore, in the present invention, in the initial stage of extracting the defective yarn, the withdrawal speed of the defective yarn is changed at a predetermined increase rate, and then the withdrawal is performed at a constant withdrawing speed so that the withdrawal can be performed smoothly and without breakage. ing.

〔Example〕

1 to 3 show the mechanical structure of the defective yarn removing device 1. This defective yarn removing device 1 is provided with a guide nozzle 2, a cutter 3, and a winding device 4 as a weft yarn removing means 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 flight path, for example, obliquely upward. The cutter 3 is provided near the cylindrical yarn guide 7 at the tip of the weft insertion nozzle 5, for example. The cutter 3 and the yarn guide 7 are attached to the sley or the loom frame by an appropriate supporting means.

The winding device 4 rotatably supports the winding body 9 and the rotating body 10 inside the tubular housing 8. The winding body 9 is rotatably and slidably supported in the axial direction by the stroke bearing 18 in the housing 8 by the rod 17, and the blow nozzle 12 is integrally formed at the center position of its tip. In addition, a conical winding surface 13 is formed on the outer peripheral portion thereof.

The blow nozzle 12 reaches the fluid intake connector 16 attached to the housing 8 and the slide bearing 11 by the communication hole 14 and the communication groove 15 on the outer periphery. Further, the winding body 9 integrally forms the rod 17 at the center position of the rear end portion. The rod 17 is slidably supported in the axial direction with respect to the stroke bearing 18 in the housing 8, and the tip end thereof corresponds to the pressing body 22 fixed to the piston rod 21 of the pressing cylinder 20. There is.

The rod 17 is constantly urged in the right direction by a coil spring 24 provided between a sleeve 19 also serving as a spring and a spring receiver 23 at the tip of the rod 17. The amount of movement of the winding body 9 to the right is restricted by the winding body 9 and the cap 25 corresponding thereto. The amount of movement in the left direction 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 the cap 25 attached to the tip of the housing 8.

Further, the rotating body 10 is integrally formed with a fitting portion 28 by a conical recess at a portion corresponding to the conical winding surface 13, and a hollow rotating shaft 29 of the extension thereof forms a housing 8. It is rotatably supported by a ball bearing 30 inside. The ball bearing 30 is in a state of being prevented from coming off by a cover 31 attached to the opening surface of the housing 8.

The inside of the rotary shaft 29 serves as a discharge path 32,
The tip portion faces the inside of the trash box 33. The rotating body 10 meshes with the gear 34b of the drive motor 35 by the gear 34a attached thereto,
Upon receiving the rotational force from the drive motor 35, the speed controller 59 drives the motor at a predetermined speed.

In this way, the winding body 9 and the rotating body 10 described above are
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 state. The guide tube 36 is open at the upper and lower surfaces, and is guided to the space where the winding body 9 and the rotating body 10 face each other by a guide hole 37 substantially below the intermediate portion. A baffle plate 38 is attached to the upper opening surface of the guide cylinder 36, if necessary.

A sensor 40 is attached near the guide hole 37 by a sensor attachment plate 39 as shown in FIGS. 4 and 5. The sensor 40 is composed of, for example, one light projecting body 41 and two light receiving bodies 42, which are mounted symmetrically with respect to the center of the guide hole 37.

Next, FIG. 6 shows the configuration of the controller 43. The sensor 40 includes a comparison circuit 45 via an amplification circuit 44.
Is connected to one input end. Also, this comparison circuit 4
5 is connected to the reference value setting device 55 at the other inlet end, and is directly connected to one input end of the AND gate 48 via the AND gate 47 and the knot circuit 46 on the output side.

Further, the first timer 49 and the second timer 50 are
The winding start signal A and the winding end signal B are input to generate timer signals C and D for a fixed time t ₁ and t ₂ , respectively, and an AND gate 47,
It is connected to the other input terminal of 48. The AND gates 47 and 48 are connected to the input ends of the OR gate 51 on the output side. Further OR gate 51
Is connected to the relay 53 via the driver 52. The relay 53 is incorporated in a circuit that generates a signal for prohibiting the restart of the loom by the relay contact 54 or a signal for stopping the defective thread removing operation.

Next, FIG. 7 shows a sequence of a series of operations.

At the time of normal weft insertion, the weft insertion nozzle 5 draws out the weft yarn 56 in a stored state from a length measuring storage device (not shown) and sequentially wefts it into the opening of the warp yarn 57 at the weft insertion timing.

However, when a weft insertion failure occurs, the loom applies a brake after receiving the "H" level weft stop signal, and automatically stops in the next cycle. Such a weft insertion failure is detected at a knitting end portion on the arrival side of the weft yarn 56 by a known weft yarn feeler (not shown) or the like.

On the other hand, the weft yarn length measuring and storage device (not shown) unwinds the weft yarn 56 at the time of receiving the weft stop signal so that the weft yarn 56 having an appropriate length can be supplied to the weft insertion nozzle 5. The length of the weft yarn 56 is at least the length required to bring it from the weft insertion nozzle 5 to the guide hole 37 of the winding device 4, and in the case of the drum type weft yarn length measuring and storing device, by the locking pin, For example, 5 weft threads for 1 roll
6 is obtained by unwinding on the drum, and in the case of the length measuring roller / air storage type weft yarn length measuring and storing device, the clamper is operated in the opening direction for a predetermined time on the upstream side of the weft inserting nozzle 5. Then, the holding of the weft yarn 56 can be regulated by temporarily releasing it.

Now, when the loom stop signal is given by the loom, first, the guide nozzle 2 injects air from the tip thereof, wipes the weft yarn 56 between the weft insertion nozzle 5 and the woven fabric 6, and woven fabric 6 The weft yarn 56 is moved toward the inside of the cylindrical yarn guide 7 of the winding device 4 in order to prevent the end portion of the yarn from being cut by the cutter 58.

At the same time, the winding body 9 takes in compressed air from the outside, injects air from the blow nozzle 12 toward the discharge passage 32 of the rotating body 10, and generates negative pressure air in the vicinity thereof. As a result, the weft yarn 56 enters the inside of the guide tube 36, and then enters the inside of the discharge passage 32 through the guide hole 37. During this time, the cutter 58 is performing the cutting operation, but the weft 56 is not cut because the weft 56 is displaced from the position of the cutter 58. As a result, the weft yarn 56 is still connected between the weft insertion nozzle 5 and the woven fabric 6.

In the meantime, the loom stops completely in the next cycle, and then automatically reverses to make the cloth fell 6a of the defective yarn 56a open. At this point, the guide nozzle 2 stops the injection of air, but the winding body 9 is
The injection of compressed air from is continued for a while.

While the air is being jetted from the blow nozzle 12, the pressing cylinder 20 is operated next, and the piston rod 21
Is moved forward, the rod 17 is moved leftward against the coil spring 24 in FIGS. 1 and 2 by the pressing body 22. Therefore, the conical winding surface 13 of the winding body 9 is in pressure contact with the portion of the conical fitting portion 28 of the rotating body 10, and holds the weft yarn 56 sandwiched between them. At the same time, the cutter 3 operates to cut the weft yarn 56 between the weft insertion nozzle 5 and the yarn guide 7 near the weft insertion nozzle 5.

After that, the drive motor 35 turns on the speed controller 59.
In response to the activation command from the
Give a rotational movement to. This speed controller 59
Controls the rotation speed of the drive motor 35 from the start-up time, as shown in FIG. 8 and FIG. 9 described later, during a period T ₀ by reading a speed pattern stored in advance with the passage of time. To go.

During this time, the winding body 9 receives a frictional rotational force due to the fitting between the tip end of the winding surface 13 and the fitting portion 28, and rotates at the same speed as the rotating body 10, and the weft yarn 56
Are sequentially wound around the outer circumference.

Now, the winding speed, that is, the drawing speed of the defective yarn is
This is shown in FIGS. 8 and 9 and 10. In each figure, the vertical axis represents the defective yarn withdrawing speed V, and the horizontal axis represents the withdrawal time T.

In FIG. 8, the sampling speed V rises at a speed V ₁ that changes at a predetermined increase rate during the period T ₁ from the start of sampling, and thereafter, during a period T ₂ , a constant speed V ₁ which is the maximum value of the speed V _{1. At 2, the} defective yarn 56a is pulled out. Here, the initial extraction speed is set to be smaller than that in the latter half so as to deal with the friction resistance in the initial extraction. Further, the sampling speed in the latter half is set to be large in order to shorten the time. Since the tension of the weft thread 56 gradually increases at the initial stage of the withdrawal, the weft thread 56 is hard to break,
And then, defective yarn 56a is completely disengaged from the front 6a weave, quickly can terminate the winding-up of the weft yarn 56 at a very early speed in the period T ₂ that are no longer afraid of yarn breakage.

In FIG. 9, during the period T ₁ from the start of sampling, at a speed V ₁ that changes at a constant increase rate, and thereafter during the period T ₂ ,
The maximum steady speed V ₂ is the speed V _1, at the speed V ₃ to vary more in subsequent predetermined reduction rate during the period T _3, withdrawal of defective yarn 56a is performed. In the period T _3, although drawing speed decreases, even if the lateral insertion failure due Gakari warp occurs, in order to prevent yarn breakage, it is desirable to pull out gently Thus the period T _3.

Further, in FIG. 10, the period T ₁ from the start of sampling
During the period, the speed is gradually increased at a constant speed V ₁ and then at a predetermined increase rate, and at the speed V ₂ until the end of the period T ₂ , and then a predetermined decrease rate (negative increase rate).
In removal of the defective yarn 56a at the speed V ₃ it is carried out gradually until the end of the period T ₃ lower the speed.

The change situation of the drawing speed has been described above, but these are selected according to the type of yarn used and the like. In all of these controls, the point common to all of them is that the extraction is performed at a relatively slow speed at least for a while after the start of extraction. Due to this winding, the defective yarn 56a becomes woven fabric 6
Is pulled out from the cloth fell 6a.

In the drawing process, the drawing direction of the defective yarn 56a is
Since the warp yarn 57 is closer to the opening than the extension line of the cloth fell 6a and is set in a direction not to rub against the warp yarn 57, the defective yarn 56a is pulled from the cloth fell 6a toward the opening side and has a small resistance. It will be pulled out. The take-up direction of such defective yarn 56a is set at the installation position of the yarn guide 7, or when the yarn guide 7 is not installed, the installation position of the winding device 4, that is, the installation position of the guide tube 36 that regulates the drawing direction. This is possible by setting the cloth fell 6a closer to the opening than the extension line.

In this way, the winding body 9 and the rotating body 10 wind up the defective yarn 56a in a coil shape on the outer periphery of the winding surface 13. The drive motor 35 automatically stops after a lapse of a certain time of the winding operation. Further, prior to that, since the pressing cylinder 20 retracts the piston rod 21, the winding body 9 is moved in the backward direction by the coil spring 24, and the conical winding surface 13 is separated from the fitting portion 28. .

At the same time, the blow nozzle 12 injects air again to blow out the defective yarn 56a wound around the winding surface 13 toward the fitting portion 28, and the inside of the hollow rotary shaft 29, that is, the discharge passage 32. After that, trash box 3
Discharge inside 3. At the time when the work of extracting the defective yarn 56a is completed, the loom automatically reverses further by a required angle and then receives an automatic operation command to start a normal weaving operation.

During this series of removing operations, the sensor 40 turns the defective yarn 5
The entry of 6a into the guide hole 37 is photoelectrically detected, and a detection signal E is generated. The detection signal E is amplified by the amplifier circuit 44 and input to one input terminal of the comparison circuit 45. Therefore, the comparison circuit 45 compares the reference value F set in advance with the detection signal E, generates the comparison signal G of "H" level when the yarn is present, and inverts it by the knot circuit 46. While sending it to the AND gate 48.

On the other hand, the first timer 49, at an appropriate timing,
Upon receiving the "H" level winding start signal A, the "H" level timer signal C is output for a predetermined time t _1.
Is output to the other input terminal of the AND gate 48. Therefore, while the timer signal C is at the "H" level, if the comparison circuit 45 outputs the yarn-free state, that is, the comparison signal G at the "L" level, the AND gate 48 sets the "H" level. The output signal is generated and the driver 52 is driven through the OR gate 51. For this reason, the relay 53 closes the relay contact 54 to generate a command to the controller of the loom to prohibit restarting or to cancel removal of the defective yarn, and stop the winding operation. This state corresponds to a faulty yarn guide or a yarn breakage accident.

Further, the second timer 50 generates the timer signal D of “H” level for a predetermined time T ₂ when it receives the winding end signal B after the winding operation is completed. While the timer signal D is at "H" level, the comparison circuit 45
When the output of the yarn present state, that is, the comparison signal G of the “H” level is output from the above, the relay 53 is operated and the relay contact 54 is closed in the same manner as described above, thereby prohibiting the restart or A defective yarn removal operation stop command is issued. This state corresponds to poor winding of the yarn or breakage of the yarn.

The winding start signal A and the winding end signal B
Is set to occur at the time when the drive motor 35 changes on and off, for example.

In the above-described embodiment, the sensor 40 is attached to the position of the guide hole 37 inside the guide tube 36 with the sensor 40 being the most ideal detection position. However, the attachment position of the sensor 40 is at another portion, for example, the yarn guide 7. It may be attached to a portion such as. Further, in the above embodiment, the sensor 40 is composed of one light emitter 41 and two light receivers 42. However, in order to enhance the weft yarn detection accuracy, a plurality of light emitters 41 or light receivers may be received. It may be configured by the body 42.

〔The invention's effect〕

In the present invention, since the withdrawal speed is changed at a predetermined increase rate in the initial stage of withdrawing the defective yarn, excessive tension is not applied to the defective yarn and the weft yarn during withdrawal of the defective yarn,
It is possible to obtain effects such as the fact that these cannot be cut in the middle, and the time required for pulling out the defective yarn can be relatively shortened, so that the defective yarn can be removed quickly.

[Brief description of drawings]

FIG. 1 is a plan view of the defective yarn removing apparatus of the present invention, FIG. 2 is a vertical sectional view of the apparatus, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. Enlarged sectional view of the part,
FIG. 5 is an enlarged front view of the sensor, FIG. 6 is a block diagram of the controller, FIG. 7 is a time chart diagram during operation, and FIG.
FIG. 9, FIG. 9 and FIG. 10 are graphs showing the extraction speed. 1 ... defective yarn removing device, 2 ... guide nozzle, 3 ... cutter, 4 ... winding device (defective yarn removing means), 5 ... weft insertion nozzle, 6 ... woven fabric, 7 ... cylindrical Yarn guide, 9 ... Winding body, 10 ... Rotating body, 12 ... Blow nozzle, 20 ... Pressing cylinder, 22 ... Pressing body, 24
...... Coil spring, 32 ...... Ejection path, 35 ...... Drive motor, 36 ...... Guide tube, 37 ...... Guide hole, 40 ...... Sensor, 43 ...... Controller, 45 ...... Comparison circuit, 46 ......
NOT circuit, 47, 48 ... AND gate, 49 ... First timer, 50 ... Second timer, 51 ... OR gate, 53 ... Relay, 54 ... Relay contact, 56 ...
... weft, 57 ... warp.

Claims (1)

[Claims] 1. In a defective yarn removing device of a weftless loom having a weft removing means for extracting a defective yarn from the front when weft insertion failure is detected, the weft removing means has a predetermined withdrawal speed at the initial stage of withdrawing. Change with the increase rate of
After that, the defective yarn is removed at a constant pulling speed, and the defective yarn removing method for a seamless loom is characterized.