JPH0136929Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention winds and measures the weft supplied from the weft supply section, stores the measured weft once, and pulls out the weft that has been wound and stored during weft insertion. The present invention relates to a weft length measuring device for a loom as described above.

Prior Art 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. ing. In this type of weft length measuring device, the weft is supplied from the weft supply section through the opening at the end of a winding tube that rotates relatively around a drum as a weft length measuring unit, 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 weft is temporarily stored, and when the weft is inserted, the wound and stored weft is pulled out.

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 common.

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 measured length of the weft yarn is adjusted by adjusting the position of each divided piece in the radial direction of the drum, the length of the yarn relative to the yarn winding surface is adjusted. Since the contact area is large, the weft wound around the drum cannot smoothly move in the weft insertion direction, and there is a fear that stable weft insertion cannot be performed.

Purpose of the invention The present invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to suppress the adhesion of fluff to the weft threads, easily adjust the measurement amount of the weft threads, and improve the thread winding. By making the surface close to a perfect circle, the unwinding resistance of the weft yarn during weft insertion can be kept constant, and by reducing the area of yarn winding contact, the weft yarn can smoothly transition in the weft insertion direction. It is an object of the present invention to provide a weft yarn length measuring device for a loom, which can prevent the weft yarn from being caught on a member constituting a yarn winding surface when unwinding the weft yarn.

Structure of the invention The present invention provides a plurality of cooking tables to the weft length measuring unit so that the mounting positions can be adjusted in the radial direction, and
The gist is that a plurality of adjustment pins forming a thread winding surface are attached to the cooking table, and a connecting rod is hung between the tips of each adjustment pin.

Embodiment Hereinafter, an embodiment embodying this invention will be described based on the drawings.A support bracket 2 is fixed to the upper end of a side frame 1 of a loom, and a rotary support shaft 3 is rotatably attached to 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 relatively rotatably on the front end side of the support body 7, and a disk-shaped support plate 8 is fixed to the front surface (right side in FIG. 1) of the support body 7. 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. Each adjustment table 13 is provided along a guide groove 8a provided in the support plate 8 with a step, so that the position of the support plate 8 in the radial direction can be adjusted by screws 15 and nuts 16. Further, each adjustment pin 14 has a first inclined portion 14a corresponding to the first inclined surface 10a of the winding piece 10, and a second inclined portion 14a corresponding to the first inclined surface 10a of the winding piece 10.
It consists of a second sloped part 14b corresponding to the sloped surface 10b, and a third sloped part 14c that is connected to the second sloped part 14b and extends toward the drum 9 toward the tip.
Furthermore, an arcuate connecting rod 17 is welded and fixed between the tips of each of the adjustment pins 14 to prevent the weft from being caught on the tips of the pins 14. Then, a winding piece 10 and a plurality of adjustment pins 1 are provided.
4 and the plurality of connecting rods 17 form a weft length measuring member that forms a thread winding surface.

A cover 18 that covers the thread-wrapped tube 6 is attached to the front surface of the support bracket 2. Magnets 19 are provided on the cover 18 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 19. held stationary.

Now, when the timing belt 5 is driven in synchronization with the weaving operation and the thread 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 thread 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 the first slope 14a to the second slope 10b and the second slope 14b. This weft Y is locked by the second weft locking pin 12 in a protruding state, and is temporarily stored on the second slope 10b and the second slope 14b.

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 yarn 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. Further, in this embodiment, since the thread winding surface is formed using the adjustment pin 14 to which fluff does not easily adhere, there is no possibility that fluff will adhere to the weft Y. Further, 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.

Furthermore, in this embodiment, since the connecting rod 17 is connected in an arc shape to the tip of each adjustment pin 14, the weft can be smoothly pulled out without being caught by the tip of the adjustment pin 14 when unwinding the weft. can be done.

Note that the present invention can also be embodied in the following embodiments.

(1) As shown in Fig. 3a, the two adjustment pins 14 and the connecting rod 17 are formed by bending one wire,
Connect the tip of the adjustment pin 14 located in the middle to the connecting rod 1
7. Further, as shown in FIG. 3b, the tip of the adjustment pin 14 is bent at a substantially right angle to form a connecting rod 17.

(2) 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
For example, an indicator scale corresponding to the length measurement amount of the weft yarn is provided on the front surface, or an appropriate number of types of adjusting tables 13 with different curvature radii are prepared depending on the length measurement amount of the weft yarn.
Please feel free to make any changes or embodiments without departing from the spirit of this invention.

Effects As described in detail above, the present invention suppresses the adhesion of fluff to the weft yarns, makes it easy to change the measured length of the weft yarns, and brings the winding surface closer to a perfect circle to improve ease of use during weft insertion. The unwinding resistance of the weft yarn can be kept constant, the weft yarn can smoothly transition to the weft insertion direction by reducing the yarn winding contact area, and the weft yarn forms the yarn winding surface when the weft yarn is unwound. This has the effect of eliminating the possibility of getting caught on a member that is attached.

[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 Figs. 3 a and b.
FIG. 7 is a perspective view showing another example of the method of attaching the connecting rod. 8... Support plate, 8a... Guide groove, 13... Adjustment stand, 14... Adjustment pin, 15... Screw, 16...
Nut, 17...Connecting rod, Y...Weft thread.

Claims (1)

[Scope of utility model registration request] In a weft length measuring device that winds a weft supplied from a weft supply section onto a winding surface of a weft length measuring unit and pulls out the weft at the time of weft insertion, a plurality of adjustment tables are provided for the weft length measuring unit. It is installed so that its mounting position can be adjusted in the radial direction, and each adjustment table has a plurality of adjustment pins that form a bobbin winding surface, and a connecting rod is provided between the tips of each adjustment pin. Weft length measuring device for looms.