JPH02160950A - Weft retracting apparatus for loom - Google Patents

Abstract

PURPOSE:To facilitate the matching of the timing of the holding of a weft with an action member and the end of weft-insertion and to perform stable weft-insertion operation by retracting the tip end of a weft into a weft insertion main nozzle based on the weft-insertion control signal of a weft-insertion apparatus. CONSTITUTION:An electromagnetic driving actuator 21 is actuated by a signal transmitted from a weft-insertion controller 9 to hold or release a weft between a weft-measuring apparatus 5 and a weft-insertion main nozzle 6 with an action member 20. The tip end of the weft is retracted into the weft-insertion main nozzle after the completion of the insertion of the released weft.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for pulling the tip of a weft yarn back inside a weft insertion main nozzle at the end of weft insertion of a loom.

A conventional weft pulling device for a loom has a structure in which a cam drives a weft pulling action member disposed between a weft length measuring device and a weft insertion main nozzle.

Problems to be Solved by the Invention In a structure in which an operating member is driven by a cam, when changing the operation timing of the operating member by replacing the weft with a weft of different thickness or strength, it is necessary to change the cam to another cam, Alternatively, it is necessary to change the position at which the cam is fixed to the camshaft, which requires a great deal of labor and time. Furthermore, when multiple weft yarns are used, such as in multicolored weaving, the number of cams increases, making it troublesome to adjust the timing of each cam's operation.

For this reason, the applicant proposed a structure in which the operating member is driven by an electromagnetically driven actuator, as shown in Japanese Patent Laid-Open No. 69945. However, this may be due to the fact that the actuator is operated from the rotation of the main shaft of the loom, or the weft length measuring device, the main weft insertion nozzle, the cutter device that cuts the weft to the normal weft insertion length, and the weft insertion main nozzle. It has been found that a complicated circuit is required to synchronize the timing of the weft insertion device including the weft sensor for detection with the end of weft insertion. In addition, when weft insertion is performed continuously using the same length measuring device, the weft yarn remains unmoored from the operating member for pulling back the weft yarn during multiple weaving cycles, so the weft yarn protrudes from the main weft insertion nozzle. Since the weft is inserted while the weft is being inserted, stable weft insertion cannot be performed.

Means for Solving the Problem A plurality of types of weft yarns stretched respectively between a plurality of weft length measuring devices and a weft insertion main nozzle are selectively inserted by a signal from a weft insertion control section, The loom is equipped with a weft length measuring device and a weft insertion main nozzle for mooring the stretched weft, respectively. During the weaving operation, when the reed I stops at the backward limit position and the warp Y opening reaches its maximum and it is time to start weft insertion, the weft insertion control section 9 sends the injection start signal Q1 to the weft insertion main nozzle 6. After the control unit 10 opens the switching valve 11 and injects the weft insertion main nozzle 6 in advance, the weft insertion control unit 9 releases the length measurement type. The signal Q2 is output to the control section 12 of the weft length measuring device 5, and the control section 12 operates the electromagnetic drive type actuator 13 for driving the length measuring claw of the weft length measuring device 5, so that the length measuring wind 14 is stored in the weft. Remove it from the drum of device 4. Then, the weft W is fed out from the drum I5 by the jet stream from the weft insertion main nozzle 6, and flies inside the warp Y opening toward the side opposite to the weft insertion main nozzle, and is inserted. Then, at the required time when the tip of the flying weft W reaches the weft sensor 8, the weft insertion control section 9 outputs a measuring claw insertion signal Q3 to the control section 12, and the control section 12 an actuating member that pulls the weft yarn into the weft insertion main nozzle side and releases the mooring of the selected weft yarn prior to weft insertion, and an electromagnetically driven actuator that is responsible for mooring and releasing operations of the acting member, The actuator is set to perform a weft unmooring operation in response to a signal from the weft insertion control section, and after the weft insertion of the unmoored weft yarn is completed, to perform a mooring operation to pull the weft yarn toward the main nozzle. It is.

The actuator performs a mooring operation based on the signal from the weft insertion control unit, and the action member moores the weft between the weft length measuring device and the weft insertion main nozzle, so that the tip of the weft is inside the weft insertion main nozzle. being pulled back.

Embodiment As shown in FIGS. 1 and 2, this embodiment exemplifies the case where one weft W is used, and roughly speaking, a reed 1, a weft inserting device 2, and a weft pulling device 3 are used. We are prepared.

The weft insertion device 2 operates the weft storage device 4 and the weft length measuring device tuator 13 to insert the length measuring wind 14 into the drum 15, while the weft insertion control section 9 causes the weft sensor 8 to operate for detection. When the normal weft insertion detection signal Q4 is input from the weft sensor 8 to the weft insertion control section 9, the reed 1 performs a beating movement from the backward limit position toward the front P, and the weft insertion is performed by this beating movement. The weft yarns W are reeded against the weaving front P, and the interlacing with the warp yarns Y is completed. When the intersecting time of the weft W and warp Y is completed, the weft insertion control section 9 outputs a weft cutting signal Q5 to the control section 16 of the cutter device 7, and the control section 16 activates the electromagnetic drive type actuator 17 of the cutter device 7. is operated to cause the cutter 18 of the cutter device 7 to perform a cutting motion consisting of a scissoring motion and a return motion, and the cutter 18 cuts the beaten weft W.
The part extending between the weaving front P and the weft inserting main nozzle 6 is cut. After this cutting is completed, the reed I retreats from the forward limit position on the front side of the weave, and during the retreat of the reed I, the upper and lower sides of the warp threads Y are switched to maximize the opening of the warp threads Y, and the reed I stops at the backward limit position. , the weft insertion of the next weaving cycle is started, and so on, so that weft insertion is repeated. This series of weft insertion operations is well known.

Here, the weft insertion control section 9 takes in the rotation angle signal 1 of the loom main shaft and the pattern signal to drive and control the weft insertion device 2. Therefore, the weft insertion control signal of the weft insertion device 2 is Injection start signal Q1 Length measurement claw release signal Q7. Length measuring claw insertion signal Q3. Normal weft insertion detection signal Q4. There is a weft cutting signal 05, etc.

The weft pulling back device 3 roughly includes an action member 20, an actuator 21, and a control section 22.

On the other hand, the action member 20 anchors the weft W stretched between the length measuring die 14 of the weft length measuring device 5 and the weft insertion main nozzle, and pulls the tip of the weft W back inside the weft insertion main nozzle 6. Prior to weft insertion, the mooring described in 1. is released.

The actuator 2I is attached to a side frame (not shown) of the loom, and is configured as an electromagnetic drive type that is responsible for the mooring and release operations of the operating member 20 connected to its output portion.

It is being

According to the above embodiment structure, during weaving operation, when the weft W is cut by the cutter 18 and the reed 1 is moved backward, the action member 20 is placed between the weft length measuring device 5 and the weft insertion main nozzle 6. The stretched weft W is moored and the tip of the weft W is pulled back inside the weft insertion main nozzle 6. In this embodiment, the length measurement wind release signal Q is delayed from the weft insertion control unit 9. After being output to the circuit 23, the reed 1 is generated by beating the reed.
A delay signal Q is sent from the delay circuit 23 to the drive circuit 24 with a required time delay until the weft inserting main nozzle 6 reaches its forward limit position. is output, and this delay signal Q6 causes the drive circuit 24 to perform a mooring operation on the actuator 21, so that the weft yarn W stretched between the length measuring die 14 and the weft insertion main nozzle 6 is moved backward by the weft insertion main nozzle 6. The working member 20 is inserted into the path of the weft W that moves from the position shown by the imaginary line in FIG. 2 to the position shown by the solid line in FIG. Ru. Then, the reed 1 and the weft insertion main nozzle control section 22 are provided with a delay circuit 23 and a drive circuit 24. Delay circuit 2
3 receives the measuring wind release signal Q of the weft insertion control signals of the weft insertion device 2 and outputs a delay signal Ql to the drive circuit 24 with a required time delay. Drive circuit 2
4 receives the delay signal Q6 and the length measurement wind release signal Q, causes the actuator 21 to perform the mooring operation of the action member 20 by the delay signal QIl, and causes the actuator 21 to perform the mooring operation of the action member 20 by the length measurement wind release signal Q. Electric power is supplied to the actuator 2I so that the action member 20 is released.

In addition, the reference numeral 30 shown in FIG. 2 is a yarn guide attached to the side frame of the loom and arranged between the length measuring die 14 and the weft pulling back device 3, and 3I is the retraction limit position of the training water due to the beating movement. The weft inserting main nozzle 6 moves from the forward limit position of the virtual drilling water to the length measuring claw 4. Specifically, the groove 3 that takes in the weft thread W stretched between it and the yarn guide 30.
2 and an insertion hole 33 of the working member 20, which is attached to the side frame of the loom and is attached to the side frame of the loom when the lever 6 retreats from the forward limit position to the backward limit position. The middle of the weft yarn W stretched between the weft insertion main nozzle 6 and the weft insertion main nozzle 6 is moored to the action member 20 as shown by the dashed line in FIG. is also pulled back inward.

On the other hand, the action member 20 mooring the weft W and pulling the tip of the weft W back into the weft inserting main nozzle 6 bypasses the delay circuit 23 from the control function unit 9 in the next weaving cycle. The length measurement wind release signal Q input to the drive circuit 24 causes the drive circuit 24 to release the actuator 21.
is released, the action member 20 returns to the retracted position outside the path of the weft W, and the tip of the weft W, which is unmoored from the action member 20, is shown by a solid line in FIG. 2 prior to weft insertion. In this way, the weft inserting preparation is completed, with the weft inserting main nozzle 6 protruding slightly from its tip toward the warp side. The weft W, which has been released from the mooring between the length measuring die 14 and the action member 20, is inserted into the warp Y opening in two rows by the jet stream from the weft insertion main nozzle 6.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can also be applied to cases where a plurality of wefts W are used, such as in multicolored weaving, as shown in FIG. 3, for example. In other words, the weft pulling device 3A may be provided for each weft W, and each of the action members 20A of the weft pulling device 3A mooring each weft W may be released in accordance with an instruction from the control unit 22 in response to the start of weft insertion. . In this embodiment, the actuator 21 is configured as a so-called motor type actuator that is electromagnetically driven to rotate.

Although not shown, the signals from the weft insertion control section 9 may include a normal weft insertion detection signal Q4, a weft cutting signal Q5, or a weft length measuring device (feeder) claw instead of the length measuring claw release signal Q2. The plate can also use a pattern signal or an air injection pattern signal from an air injection valve control device of the main weft insertion nozzle.

Effects of the Invention As described above, according to the present invention, the tip of the weft yarn can be pulled back inside the main weft insertion nozzle based on the weft insertion control signal of the weft insertion device, which is advantageous in using an electromagnetically driven actuator. In addition to this, with a simple circuit configuration, it is possible to easily synchronize the timing of the weft mooring operation of the action member with the end of weft insertion. Further, according to the present invention, the weft yarn is drawn into the main weft insertion nozzle every time the weft insertion is completed, so that stable weft insertion can be performed at all times.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing the main parts of the same embodiment, and FIG. 3 is a perspective view showing the main parts of a different example of the invention. 2. Weft insertion device, 3.3A.. Weft pulling back device, 5
... Weft length measuring device, 6 ... Weft insertion main nozzle, 9
...Weft insertion control section, 20.20A..Action member, 21° 21A.Actuator, 22.Control section. Figure 1

Claims (1)

[Claims] (1) A plurality of weft length measuring devices and a weft insertion main nozzle are selectively inserted with a plurality of types of wefts stretched respectively by a signal from a weft insertion control section, the weft length measuring device and a weft insertion main nozzle, respectively, mooring the weft yarns stretched across the weft insertion main nozzle, pulling the weft tip end toward the weft insertion main nozzle side, and releasing the mooring of the selected weft yarns prior to weft insertion; An electromagnetically driven actuator is provided for mooring and releasing the member, and the actuator performs the weft unmooring operation in response to a signal from the weft insertion control section, and completes weft insertion of the unmoored weft thread. A weft pulling back device for a loom is configured to perform a mooring operation to later pull the weft toward the main nozzle.