JPS6342147Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention wraps and measures the weft supplied from the weft supply section, and also temporarily wraps and stores the measured weft, and when inserting the weft, pulls out the weft that has been wrapped and stored. The present invention relates to a weft length measuring device for a loom as described above.

In general, shuttleless looms, especially fluid jet looms, are equipped with a weft length measuring device that measures the length of the weft for one weft insertion in advance and temporarily stores the measured weft. . In this type of weft length measuring device, the weft is supplied from a weft supply section through the opening at the end of a winding tube that rotates around a drum as a weft length measuring section, and the weft is wound around the drum to measure its length. In addition, a weft length measuring device has been proposed in which the measured weft is once wound and stored, and the wound and stored weft is pulled out at the time of weft insertion.

In this winding type weft length measuring device, the length measurement amount of the weft wound on the drum and the transition in the weft pulling direction are controlled by a pair of weft locking pins that protrude and retract from approximately the same part of the drum circumference. It is becoming more and more like this.

By the way, if the weaving width of the woven fabric changes, the measured length of the weft yarn must also be changed, but conventionally, a plurality of adjustment members for changing the measured length have been arranged on the peripheral surface of the drum on the opposite side from both of the locking pins. There is a method in which the amount of length measurement is changed by moving and adjusting each adjustment member in the radial direction of the drum to change the length of the weft thread that is wound once around the drum. However, in this method, each adjustment member must be adjusted individually, which is very troublesome.

In addition, in a method of adjusting the weft length measurement amount by curving an elastic plate member to form a yarn winding surface and adjusting the degree of curvature of the plate member, the yarn winding surface becomes a circular shape. Therefore, the unwinding resistance of the weft yarns during weft insertion may be uneven, leading to a risk of weft insertion errors.Furthermore, fly fluff tends to accumulate inside the plate member, and this accumulated fly fluff is pulled out during weft insertion. There was a risk that it would adhere to the weft threads and become clogged in the main nozzle for inserting the weft, or be woven into the fabric.

In addition, in a method in which the drum forming the yarn winding surface is composed of a plurality of divided pieces, and the length measurement amount of the weft yarn is adjusted by adjusting the position of each divided piece in the radial direction of the drum, the yarn is formed on the yarn winding surface. Since the contact area is large, the weft wound on the drum cannot smoothly transition to the weft insertion direction.
There was a fear that stable weft insertion would not be possible.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to fix a plurality of adjustment pins each having a first sloped portion and a second sloped portion to a plurality of adjustment tables so as to adjust the thread winding surface. By forming the above-mentioned adjustment tables so that the mounting position can be adjusted in the radial direction of the weft yarn length measuring unit, it is difficult for fluff to adhere to the weft yarns, and there are fewer adjustment points for changing the length measurement amount of the weft yarns. It is possible to make the yarn winding surface close to a perfect circle, which in turn makes it possible to keep the unwinding resistance of the weft constant during weft insertion, and to reduce the yarn winding contact area. An object of the present invention is to provide a weft length measuring device for a loom, which allows the weft to smoothly move in the weft insertion direction.

An embodiment embodying this invention will be described below with reference to the drawings.A support bracket 2 is fixed to the upper end of a side frame 1 of a loom, and a rotation support shaft 3 rotatably passes through the bracket 2. The support shaft 3 is provided with a weft guide hole 3a along its axis for guiding the weft Y supplied from a weft supply unit (not shown) such as cheese.
A toothed pulley 4 is fixed to the base end side of the rotation support shaft 3, and a timing belt 5 is hung around the pulley 4. The belt 5 is driven in synchronization with the weaving operation and rotates the rotary support shaft 3.

A thread winding tube 6 is attached to the rotating support shaft 3 in the vicinity of the support bracket 2 so as to communicate with the weft guide hole 3a, and its tip is opened near the thread winding surface, which will be described later. Rotation support shaft 3
A support body 7 is supported so as to be relatively rotatable on the tip side thereof, and a disk-shaped support plate 8 is fixed to the front side (on the right side in FIG. 1) of the support body 7 so as to be relatively rotatable with respect to the rotary support shaft 3. There is. Further, a drum 9 is attached to the front surface of the support plate 8.

A winding piece 10 attached to a support plate 8 is provided on the upper side of the drum 9. A pair of first and second weft locking pins 11 and 12 that alternately protrude and retract from the drum 9 are provided near the winding piece 10. Both weft locking pins 11 and 12 are adapted to be moved in and out by a cam mechanism (not shown) linked to the rotation support shaft 3. The first weft locking pin 11 is retracted from the first slope 10a of the winding piece 10, and the second weft locking pin 12 is retracted from the second slope 10b of the winding piece 10.
It has been appearing ever since.

An arc-shaped adjustment table 13 is provided on the front side of the peripheral edge of the support plate 8.
A plurality of (three in the present embodiment) adjustment pins 14 are provided, and a plurality (four in the present embodiment) of adjustment pins 14 are attached to each adjustment table 13. As shown in FIG. 3, each adjustment table 13 is provided so that its position can be adjusted by a screw 15 and a nut 16 along a guide groove 8a having a step provided along the radial direction of the support plate 8. Further, each adjustment pin 14 includes a first inclined portion 14a corresponding to the first inclined surface 10a of the winding piece 10, and a second inclined portion 14b corresponding to the second inclined surface 10b. And winding piece 1
0 and the plurality of adjustment pins 14 form a weft length measuring member that forms a thread winding surface.

A cover 17 that covers the thread-wrapped tube 6 is attached to the front surface of the support bracket 2. Magnets 18 are provided on the cover 17 and the support plate 8 so as to face each other and are attracted to each other. Therefore, when the timing belt 5 is driven and the rotary support shaft 3 is rotated, the thread-wrapped tube 6 rotates integrally with the support shaft 3, and the support plate 8 does not rotate due to the attraction action of the magnet 18. held stationary.

Now, when the timing belt 5 is driven in synchronization with the mechanization operation and the yarn winding tube 6 rotates around the stationary support plate 8, the thread is passed from the yarn supply section through the weft guide hole 3a and the yarn winding tube 6. The supplied weft Y is locked by the first weft locking pin 11 which is in a protruding state, and the first slope 10a and the first slope part 1
4a and the length is measured. When the weft Y is wound and measured by the length of one weft insertion, the first weft locking pin 1
1 is immersed in the drum 9, and the weft Y whose length is measured after being wrapped
transitions from the first slope 10a and first slope 14a to the second slope 10b and second slope 14b. Then, the second slope 10b and the second slope 1
The weft yarn Y that has moved to 4b is locked by the second weft locking pin 12 in a protruding state, and the weft yarn Y moves to the second inclined surface 10.
b and the second inclined portion 14b and then the length is measured.

When the second weft locking pin 12 is retracted in synchronization with the weft insertion timing, the wound and stored weft Y is pulled out from the weft length measuring unit and inserted.

Now, in order to change the measured length of the weft in response to a change in the weaving width of the woven fabric, it is sufficient to first loosen the screws 15 and nuts 16 and move each adjustment table 13 along the guide groove 8a.

In this way, in this embodiment, the length measurement amount of the weft can be changed simply by sliding the adjustment table 13 to which a plurality of adjustment pins are attached, which is different from the conventional example using a large number of adjustment members. Differently, it is easy to adjust for changing the weft length measurement. Also, in this embodiment, unlike the conventional example in which the thread winding surface is formed by bending an elastic plate member, the thread winding surface is formed using the adjustment pin 14 to which fluff does not easily adhere. There is no possibility that the weft yarn Y would get wet if the fluff adhered to it. Also, by using the adjustment pin 14,
The contact area with the yarn is reduced, and the transition of the weft Y in the weft insertion direction is performed smoothly.

Further, in this embodiment, since the yarn winding surface can be made close to a perfect circle by the large number of adjustment pins 14, the unwinding resistance of the weft yarn during weft insertion can be made constant.

Note that the present invention is not limited to the above-mentioned embodiments. For example, it is possible to provide two or four or more adjustment tables 13, increase or decrease the adjustment pins 14 as appropriate, or set the measured length of the weft on the front surface of the support plate 8. For example, by providing an indication scale corresponding to the length of the weft yarn, or by preparing an appropriate number of types of support stands 13 with different radii of curvature in accordance with the measured length of the weft yarn.
It is also possible to make arbitrary changes and embodiments without departing from the spirit of the present invention.

As described in detail above, the present invention fixes a plurality of adjustment pins each having a first slope portion and a second slope portion to a plurality of adjustment tables to form a yarn winding surface, and connects each adjustment table to a weft measuring surface. The installation position can be adjusted in the radial direction of the long body, making it difficult for air fluff to adhere.
The number of adjustment points for changing the measured length of the weft can be reduced, the winding surface can be made close to a perfect circle, and the unwinding resistance of the weft can be kept constant during weft insertion, and This has the effect that the weft can be smoothly transferred to the weft insertion direction.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment embodying the present invention, FIG. 2 is a front view, and FIG. 3 is a cutaway perspective view showing a method of attaching an adjustment table. 8... Support plate, 8a... Guide groove, 13... Adjustment stand, 14... Adjustment pin, 14a... First inclined part,
14b...second inclined part, 15...screw, 16...
Natsuto, Y...weft.

Claims (1)

[Scope of utility model registration request] In the weft length measuring device, the weft yarn supplied from the weft supply section is wound onto the thread winding surface of the weft length measuring unit, and the length of the weft yarn pulled out at the time of weft insertion is measured using a weft locking pin. A plurality of adjustment pins each having an inclined portion and a second inclined portion are each fixed to a plurality of adjustment tables to form a thread winding surface, and the mounting position of each adjustment table can be adjusted in the radial direction of the weft length measuring member. A weft length measuring device for a loom, characterized in that: