JPS6134260A - Automatic draw-out method and apparatus of inferior weft yarn in 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 Field of Application) - This invention relates to a method and device for automatically pulling out defective weft yarns in a loom, and more specifically to short pick and leading edge removal in a fluid jet loom.

When the loom stops operating due to weft insertion failure such as weft breakage or feeler error, weft yarns that are incompletely inserted next due to defective weft yarns and inertia of the loom (hereinafter referred to as ``next yarn'') This paper relates to the improvement of technology for automatically extracting the following information.

(Prior art) The technology itself for automatically pulling out defective weft yarns from the shed when a loom stops operating due to defective weft insertion is already known, and one example is a device proposed in Japanese Patent Application Laid-Open No. 58-220856. It is.

This proposed device has a unit that reciprocates in the weft direction above the shed in the vicinity of the fabric, and a releasing member and a catching member for defective weft threads are installed in this unit. When a defective weft insertion occurs and the loom stops operating to finish picking out the defective weft yarn, the lower end of the finger hanging down from the release member slides backward in the warp direction on the fabric, reaching the front of the fabric and picking it out. The catching member then descends, and the lower end tightening surface of the rod that hangs down receives the defective weft released from the woven fabric, and the adjacent support surface Press and hold. Thereafter, when the catching member rises, the caught defective weft yarns form a loop, pass between the warp rows, and are pulled out of the shed.

The proposed conventional device has achieved its purpose of automating the work of pulling out defective weft yarns.

However, this device is only involved in picking out defective weft yarns,
The processing of the yarn, which is the step immediately before the completion of the process, ie, the drawing process, is performed by completely separate means. However, if the actions of the releasing member and the catching member are repeated twice, it is possible to automatically pull out the previous yarn in the same way as with the defective weft yarn. Even if it were possible, this conventional device would not be able to There is a big drawback. First of all, since the defective weft yarns are strongly hit against the woven fabric due to the reed beating during the inertia operation of the loom, they remain in close contact with the woven fabric even after the weaving has been completed. Therefore, even if the lower end of the finger of the release member slides on the fabric and comes to the position of the fabric front, it does not necessarily fall between the defective weft and the fabric front and catch the defective weft. In order to avoid this inconvenience, such as the unreliability of releasing the fingers from the fabric, it is conceivable to use a spring or the like to forcefully press the lower ends of the fingers downward.

However, in this case, the sharp lower end of the finger will strongly scratch the cloth surface when sliding on the cloth up to the weaving area, which is undesirable because the cloth will be damaged.

Furthermore, even if the defective weft yarns are successfully released from the woven fabric front, the defective weft yarns must first be delivered to the tightening surface of the rod of the catching member and held between the support surface and the defective weft yarns, which are released from the woven fabric fabric and not restrained. It is extremely difficult to transfer a defective weft yarn in a specific posture between two relatively small members in this way, and if the defective weft yarn loses its posture for some reason during the process, it will come off from the member.

As described above, the automatic drawing devices proposed in the past were intended only for drawing out defective weft yarns, and the preliminary work was performed by a separate means, and furthermore, the reliability of the work was poor. And if you try to increase reliability, you will inevitably have other inconveniences, such as damaging the fabric or making the structure larger.

(Object of the Invention) An object of the present invention is to automatically pull out defective weft yarns from a shed, continuously with the preliminary operation, using a single device and in a simple operation.

Another object of the invention is to carry out the automatic withdrawal of defective weft yarns from the shed without incurring other inconveniences thereby.

(Basic Structure of the Invention) In the present invention, a group of needles that are arranged concentrically in parallel with each other and that can revolve around a common central axis is used to detect the results of weft insertion on the weft arrival side.

The cutter is temporarily deactivated by the generated poor insertion detection signal, and the gripper of the weft supply device is opened.
The solenoid, which also operates in response to this detection signal, moves the needle group from the standby position to the operating position slightly in front of the main nozzle and engages the next thread connected to the main nozzle, which also operates in response to the detection signal. The motor revolves the needle group and wraps it around it to pull out all the next yarn from the shed, the loom is reversed once to pick out the defective weft yarn, and the motor revolves the needle group and wraps it around it. By winding it, all the defective weft yarns are pulled out from the shed.
Engage the cutter with the weft yarn that runs from the needle group to the main nozzle, restart the normal operation of the loom, operate the cutter, cut the weft yarn that goes from the needle group to the main nozzle, and remove the weft yarn wrapped around the needle group as well. 8, and the needle group is returned to the initial standby position by the action of the solenoid.

(Embodiment) What is shown in FIG. 1 is an example of an automatic weft drawing device of the present invention. It is arranged.

A base end of a lever bracket 3, which also extends in the horizontal direction, is loosely fitted into a support shaft 2 erected at the tip of a pace bracket 1, which is horizontally fixed to a frame F of the loom.

The base end of this lever bracket 3 is bifurcated,
The tip of one limb 3a is the horizontal plunger 4 of the first solenoid 4 fixed on the pace bracket 1.
It is freely connected to the tip of a. Also the other limb 3b
A tension spring 7 is interposed between the pin 6 and the pin 6 erected on the base bracket 1. Therefore, when the plunger 4a moves back and forth due to the action of the solenoid 4, the lever bracket 3 as a whole rotates about the support shaft 2 in the horizontal direction. In order to restrict the rotation of the lever bracket 3 in the clockwise direction in the diagram, a first stopper 8 is provided upright at a suitable position on the base bracket l.

A lower end of a motor lever 11 is loosely fitted into a horizontal support shaft 9 that is fixed to a bearing formed on the upper surface near the tip of the bracket 3 and extends in the transverse direction. A lever 12 that extends downward integrally with the lower end of the motor lever 11 is loosely fitted on the support shaft 9, and the lower end of the lever 12 is connected to a spring seat 13 provided on the side surface of the tip of the lever bracket 3. A tension spring 14 is interposed between them.

Further, a second stopper 16 is provided on the side surface of the tip of the lever bracket 3 so as to come into contact with the lever 12 when the motor lever 11 is in the illustrated upright state.

A stand 17 is formed at the tip of the lever bracket 3, extending obliquely upward, and a plunger 18a of the solenoid 18 of the FF12 fixed to this stand 17 extends obliquely upward, and its tip is connected to the motor. It is freely connected to the lever 11. Therefore, when the plunger 18a moves back and forth due to the action of the solenoid 18, the motor lever 11 as a whole rotates around the support shaft 9.

Bracket 19 fixed to the upper end of motor lever 11
A motor 21 is installed on the
is configured to be able to control rotational torque. The output shaft 21a of this motor 21 extends parallel to the extending direction of the base bracket 1 and horizontally when the motor lever 11 is in an upright state, and several needles 22 extend from the periphery of its tip. They are arranged in concentric circles and protrude.

From the bracket 19, a pair of left and right support plates 23 are installed parallel to the motor output shaft 21a with the motor output shaft 21a in between.
It extends to the same position as the tip of. These support plates 23
Support plates 24 and 26 are attached to the top and bottom of the tip of the support plate 23, and the support plate 23 has a weft inlet 23a opened at the tip.
are formed on both sides of the support plate 23, and this weft thread introduction port 2
A light projector 23b and a light receiver 23c are respectively attached to the upper and lower sides of 3a, and these detect the presence or absence of a weft thread connected to the shed, as will be described later.

By the way, the relative positions of each of the above elements are determined as follows. That is, when the plunger 4a is retracted by the action of the first solenoid 4 and the plunger 18a is moved forward by the action of the second solenoid 18, the lever bracket 3 is moved with respect to the pace bladder 2 and 1.
is in a substantially straight line, the motor lever 11 is substantially upright, and the needle 22 is placed in the standby position shown in the figure.Then, the second solenoid 18 causes its plunger 18a to retract and move the motor lever 11 When the needle 22 is in the tilted state, the needle 22 is placed in a first working position slightly in front of the nozzle N. Further, when the first solenoid 4 is turned ffJ, the plunger 4a is advanced and rotated relative to the pace bracket 1, and the needle 22 is placed in the second working position near the car and tar C.

By the way, in this invention, in order to continuously pull out the next yarn and the defective weft yarn, as will be described later, the cutter 〇 is temporarily deactivated by the weft insertion defect detection signal to prevent the defective weft yarn from being cut by the cutter C. It is necessary. An example of a mechanism for performing such an operation is shown in FIG. 2, which is a scissor-type cutter.

Fixed blade 31 of cutter 〇 is fixed to the frame, and movable blade 3
2 is supported by a bottle. Similarly, an L-shaped cam lever 33 is rotatably supported on the frame at an apex angle, and the upper end of the vertical limb 33a of this cam lever 33 and the lower end of the movable blade 32 are connected by a link 34. A third solenoid 35 is provided to keep a roller 36 attached to the tip of the horizontal branch of the cam lever 33 in elastic pressure contact with a cutter cam 39 tightly fitted to a cam shaft 38 that rotates in synchronization with the loom by the action of a tension spring 37. , the plunger 35a is engaged with the vertical limb 33a of the cam lever 33 as shown in the figure only when the weft is in the advancing state, and as a result of weft insertion detection on the weft arrival side, a weft insertion defect detection signal is input. and solenoid 35 is plunger 35a
Configure it to advance.

If the weft insertion is normal, the second row 36 rests on the bottom of the cutter cam 39 when the cutting timing comes, and the cam lever 33
rotates counterclockwise in the figure, the cutter ○ closes, and the inserted weft yarn is cut. At this time, the plunger 35a of the solenoid 35 is in the rear position, so the cam lever 3
In the case of defective weft insertion, the solenoid 35 is actuated by the defective weft insertion detection signal and the plunger 35a advances. Therefore, even if the bottom of the cutter cam 39 reaches the position of the roller 36 at the timing of cutting, the cam lever 33 cannot be rotated because it is blocked by the plunger 35a. Therefore, the cutter C remains open, and the weft is inserted. Defective wefts are not cut.

However, the mechanism for temporarily disabling the cutter is not limited to this, and various types can be adopted depending on the process conditions, as will be described in detail later.

Next, the operation will be explained with reference to FIGS. 3(A) to 3(E). Note that in these drawings, a part of the apparatus is omitted for simplicity.

ff53 Figure (A) shows that a defective weft W has occurred.

A4!1 continues to operate due to inertia, the shed closes, the next yarn W' is inserted to the middle of the next shed in the width direction, and the loom stops operating. Since the cutter C is temporarily inactivated by a mechanism such as that shown in FIG. 2 in response to the defective insertion detection signal, the defective weft W is restrained by the warp row T without being cut. Therefore, the next yarn W' is connected to the nozzle N on the one hand and to the defective weft yarn W at the fabric end, and is present in the shed in a substantially U-shape. The needle 22 of the drawer unit is placed in a standby position. At this timing, the gripper H of the weft supply device is opened by the weft insertion failure detection signal, and the weft connected to the nozzle N is released.

Next, the solenoid 18 of fjS2 is actuated by the weft insertion defect detection signal, and its plunger 18a is moved backward, the motor lever 11 is tilted, and the needle 22 moves to W4 in front of the nozzle N as shown in FIG. 3(B). ] is placed in the working position.

In this state, the weft passes through the weft inlet 23a of the support plate 23, and the needle 22 engages with the weft.

At this timing, the weft insertion defect detection signal is output to the motor 2.
1 and its output shaft 21a rotates, so the weft thread is wound around the group of needles 22, and the weft thread is pulled out from the nozzle N, but at the same time, the weft thread is pulled out from the nozzle N, but at the same time It is also the thread W'. That is, the next yarn W' is pulled out of the shed.

As shown in FIG. 3(C), when the next yarn W' in the shed is completely pulled out, the weft on the needle group is directly connected to the defective weft W, but the defective weft W is still in the warp row T. Since it is restrained, it cannot be pulled out, so tension is created in the weft thread, and motor 2
1 detects this tension and stops rotation.

Next, when the loom is reversed once, the restraint of the warp row T on the defective weft W is released and the tension on the weft is also eliminated, so the motor 21 rotates again and the defective weft W is pulled out from the shed and wound onto the needle group. . When the defective weft W is completely pulled out from the shed and wound onto the needle group as shown in FIG. 3(D),
The light receiver 23c detects this, and the motor 2
1 stops rotation/rotation. At the same time, the first
Due to the action of the solenoid 4, the plunger 4a advances, the lever bracket 3 rotates in the horizontal direction, and the cup +2
2 is the force (fi4) near C as shown in Figure 3(E).
2 working position. During this time, the needle group moves while holding the weft yarn connected to the nozzle N and pulling out the weft yarn from the nozzle N. The weft yarn connected to nozzle N passes through the tip of cutter 〇 and reaches the temple.

In this state, when the gripper H is closed and the motor 21 is rotated a little further, tension is generated in the weft connected to the nozzle N, and this is detected and the motor 21 stops rotating.

Stop. This is an operation for applying appropriate tension to the weft threads connected to the nozzle N.

At this point, when the H& machine is restarted, the cutter 〇 will operate at the next weft insertion, resulting in a y-island as shown in Figure 3 (F), and the weft is wrapped around the needle group of the pull-out device, but from now on There are no continuous weft threads, and the easiest way to remove the weft threads above the needle group is for a worker to remove them by hand, or alternatively, a suction tube may be installed in the bracket 19 and opened facing the needle group. Furthermore, a suction tube may be provided at the second working position or at the standby position so as to open facing the needle group placed at these positions.In addition, as shown in FIG. At the standby position of the needle group 22, a suction box 51 may be provided so as to enclose it, and the tube 52 may be connected to a suction source, and a lid 53 may be provided in front so that the needle group 22 can go in and out. In any case, the needle 22 is returned to the initial standby position shown in FIG. 3(A) due to the reverse action of the solenoid 4.18, and the entire pull-out device is activated when the next weft insertion failure occurs. Prepare for.

By the way, in the above example, in the process from FIG. 3 (D) to (E), the needle 22 is
is moved from the first to the second working position. However, since the purpose of this is to cut the weft yarn connected to the nozzle N by the cutter 〇, it is not necessarily necessary to horizontally rotate the lever bra and the kerato 3 using the solenoid 4, as shown in Fig. 3.

In the state shown in (D), the weft threads extending from the needle group to the nozzle N may be guided to enter the tip of the cutter C using a separate guide member as appropriate.

Also, although the weft tension is detected and the seventh motor 21 is stopped at the timings shown in fiS3 diagrams (C) and (E), it is not necessary to do this, and the tension may be maintained at a constant tension by torque detection. .

Furthermore, although the absence of the weft yarn is optically detected in FIGS. 3(D) and 3(F), it is not necessary to do so as the arrangement of the needles 22 and the rotational speed of the motor 21 are known. The winding length of the weft yarn from the needle group to the needle group can be calculated in advance. A signal may be generated by an appropriate timer based on this data.

FIG. 2 shows a mechanism for temporarily disabling the cutter for a scissor type cutter, and FIG. 4 shows a mechanism for temporarily disabling the cutter for a heat cutter.

A support plate 4 made of an elastic material is provided at the end of the weft injection side of the reed frame RF.
] extends downward and is fixed, and a pair of left and right seed thread members 42 and 43 are formed in the lower half of the seed thread members 42 and 43 projecting forward. Piece 42a
is formed.

Furthermore, on the outside, a solenoid 44 is connected to the plunger 4.
4a is oriented in the weft direction. This solenoid 44 advances its plunger 44a in response to a weft insertion defect detection signal. In addition, when the reed reaches the most advanced position, if the plunger 44 is in the advanced state, it will hit the front surface of the contact piece 42a and the support plate 4 cannot follow the forward movement of the reed, and its elasticity causes it to move backward. Set it so that it bends.

When the weft insertion is normal, the solenoid 44 does not operate, so the plunger 44a is in the retracted state.

Therefore, the support plate 4 moves forward without being hindered, and when the reed reaches the most advanced position, the seed thread members 42 and 43 move forward without being hindered.
′. Therefore, the weft yarn is bent as shown and pressed against the heat cutter C' to cut it.

In case of defective weft insertion, a defective weft insertion detection signal is used.

Lenoid 44 operates to advance plunger 44al. Therefore, the contact piece 42a hits the plunger 44a, and the support plate 4 is bent greatly backwards due to its elasticity.Therefore, even when the reed is at its most advanced position, the seed yarn members 42 and 43 are moved backwards from the heat cutter C'. Since the weft yarn is not pressed by the heat cutter C', it is not cut.

(Effects of the Invention) According to the present invention, not only the pulling out of defective weft yarns from the shed but also the preliminary work is performed continuously using the same device. It really helps speed up the process and saves labor. In addition, the needle group engages and captures the weft yarn at a position slightly in front of the main nozzle, and winds it up by its revolution, so the work is reliable. Since it does not touch the cloth at all, it will not damage the cloth.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of an automatic drawer device of the present invention;
Fig. 2 is a side view showing an example of a mechanism for temporarily disabling the cutter, Figs. 3 (A) to (F) are plan views explaining the operation of the device in Fig. 9:fS1, and Fig. 4 is a side view showing an example of a mechanism for temporarily disabling the cutter. FIG. 5 is a perspective view showing another example of a mechanism for temporarily disabling the cutter, and FIG. 5 is a plan view showing one method of weft removal. CF...Orimae N...Main nozzle c,
c'...Cutter H...Gripper RF...Reed frame W...Defective weft W'...Next thread
T...Warp row l...Base bracket 3...
・Lever bracket 4.18...Solenoid 11・
・・Motor lever 21・・Motor 22・
...Needle 35.44...For cutter 39...Cutter cam solenoid 23b...Emitter 42.43...Seed yarn member 23c...Receiver 51
... Suction box patent applicant Tsudakoma Kogyo Co., Ltd. Patent application agent Patent attorney Sugawara Part 3 Figure 3 Figure 3 Figure 3 Figure 3

Claims (1)

[Scope of Claims] [1] A weft insertion defect detection signal generated as a result of weft insertion detection on the weft arrival side using a group of needles that are arranged concentrically in parallel with each other and that can revolve around a common central axis. In response to this, the cutter is temporarily deactivated and the weft fed to the main nozzle is released, and in response to this detection signal, the needle group is moved from the standby position to a working position slightly in front of the main nozzle. The needles are engaged with the next thread connected to the main nozzle, and the next thread is pulled out from the shed by rotating the needle group and wrapping around it in response to the detection signal, and the loom is reversed once to detect the defect. The weft is pulled out, and the needle group is then revolved and wrapped around it to pull out all the defective weft from the shed.The weft yarn that runs from the needle group to the main nozzle is engaged with the cutter, and the loom resumes normal operation. automatic withdrawal of defective weft threads in a loom, comprising operating a cutter to cut the weft threads connected to the main nozzle from the needle group, removing the wound weft threads from the needle group, and then returning the needle group to a standby position. Method. [2] After the weft threads connected from the needle group to the main nozzle are engaged with the cutter, the weft threads supplied to the main nozzle are restrained, and the above-mentioned weft threads are further wound around it by revolving the needle group. The method according to claim 1, further comprising: [3] A motor (21) installed on a motor lever (11) rotatably provided in a vertical plane and driven by a weft insertion failure detection signal generated as a result of weft insertion detection on the weft arrival side. ), a needle group consisting of a plurality of needles (22) provided in a concentric circle parallel to each other at the tip of the output shaft of this motor, and a needle group consisting of a plurality of needles (22) provided concentrically in parallel with each other, and the cutter (C) of the loom temporarily driven by the above detection signal. A defective weft yarn in a loom comprising a mechanism (18) that makes the needle group inoperable and a mechanism (18) that is driven by the detection signal and rotates the motor lever to position the needle group at a working position slightly in front of the main nozzle. automatic withdrawal device. [4] A mechanism (3, 4) that is driven by the detection signal to move the motor lever relative to a fixed point on the loom frame to position the needle group from the working position to a second working position near the cutter. ) The device according to claim 3, further comprising: