JPS5842468Y2 - Weft length measuring device for shuttleless looms - Google Patents

Description

[Detailed description of the invention] In a shuttleless loom that uses fluid to insert the weft into the warp shedding, a constant long weft is produced between the end of the weft insertion and the time of the next weft insertion. is stored in a free state, and this stored weft is released all at once during the weft insertion movement.
This enables rapid weft insertion.

Furthermore, if the length of the stored yarn is made to be equal to the medium length of the fabric, the length of the stored yarn will become quite long and management such as preventing the stored yarn from getting tangled will be complicated. In order to obtain the thread length of the fabric width by the sending length and the stored weft length, the thread is continuously drawn out from the thread supply source and continuously sent to the weft storage section.

In this type of shuttleless loom, which releases the stored weft yarns at the appropriate time and then continuously sends out the weft yarns, it is necessary to change the amount of continuous weft yarn feeding out due to changes in the fabric width, changes in the weft insertion movement time, etc. Therefore, a weft length measuring device that can change the feed amount at appropriate times is required.

The weft length measuring device is generally of the type in which the weft is wound around the circumference and the weft is continuously sent to the weft storage device by the rotation of a roller. This is done by changing the number of rotations of the rollers.

Conventionally considered means for changing the feed amount of a weft length measuring device is to use a winding roller as a passive driven roller that rotates by coming into contact with an actively rotating drive drum, and to use a drive drum that has a different diameter. In some cases, the drive drum has a conical shape, and the position of the roller is changed in order to wrap the drive drum in pressure contact with the conical drive drum.

However, in the former case, it is necessary to prepare a large number of drive drums with different diameters, and the operation of replacing the drums is complicated.

In the latter case, the position of the winding changes each time the roller rotates, so the weft winding has the disadvantage that the state tends to change.

When the weft is pinched and held between the drive drum and the winding roller, static electricity is generated in the thread and the winding tends to become entangled with the roller or drive drum, and as a result of the pinching, the weft becomes flat. Not only is this undesirable as a weft for textiles, but it also has the disadvantage that the flying of the weft by fluid jetting is not carried out efficiently.

The present invention has been developed in view of the above-mentioned drawbacks of the conventional device, and has been devised to improve these problems.It eliminates the trouble of replacing the drive drum, and also eliminates the negative effects caused by pinching the weft yarn. A unique structure was created from the viewpoint of eliminating serious defects caused by positional fluctuations of the rollers.

In a shuttleless loom, which discharges the stored weft yarns all at once with a fluid jet and then continuously sends out the weft yarns, it is essential for rapid weft insertion that there is little resistance when the weft yarns fly.

Therefore, even when the weft yarn sent out from the roller enters the weft storage injection nozzle in order to be sprayed into the storage device, the weft winding should enter from the angular position with the least resistance, and the weft yarn is designed from this point of view.

Specifically, as shown in the figure, the weft length measuring device is drawn out from a yarn supply source, is wound around a roller 2 via a yarn separator 1, is wound several times between the two, and then is transferred from the separator 1 to the weft storage. Therefore, care is taken to ensure that the yarn Y from the separator 1 to the nozzle 3 does not make a large angle with respect to the longitudinal direction of the nozzle 3.

As a result, the weft yarn is wound quickly as the roller 2 rotates, and the weft yarn is sent out smoothly through the separator 1 to the nozzle 3.
More will be sprayed.

As in the conventional device, the wrapping is done by roller 2 and separator 1.
In the case of the type in which the weft delivery amount is changed by changing the position of the weft yarn, the angular position of the weft yarn Y connected to the separator 1 and the weft storage injection nozzle 3 changes every time the delivery amount is changed, so that The contact resistance at the inlet portion and the separator 1 portion changes, and not only is it impossible to obtain a uniform weft flight speed at the nozzle 3, but also the yarn Y may come off from the separator 1 at a certain angular position.

The same can be said of the yarn Y' that enters the separator 1 from the tension applying device 4.

To explain the device of the present invention with reference to a diagram, the thread pulled out from the cheese 5 passes through a tension applying device 4 and then reaches a length measuring device.In the length measuring device, the thread first comes into contact with the separator 1. Next, the yarn is wound around a roller 2, and after being wound several times between the rollers 2 and 2, it is sent out to a weft storage injection nozzle 3 while being in contact with a separator 1.

The winding is performed by continuous rotation of the roller 2, and the weft is jetted from the nozzle 3, stored in a loop shape in the weft storage device 6, and then the weft holding device 7 is opened during the weft insertion movement, so that the stored weft is guided. 8 through the weft insertion nozzle 9
The weft is released into the warp opening at once by the action of , and the winding continues to be sent out from the rollers 2. When the weft tip has finished passing through the warp opening, the weft holding device 7 holds the weft, so that the weft is unwound again. storage begins.

Now, to describe the configuration of the length measuring device, a conical drive drum 13 is attached to a shaft 12 through which rotation related to the rotation of the loom is transmitted via a belt 10 and a pulley 11.
On the other hand, a tilted shaft 17 is supported at the tip of an arm 16 rotatably mounted on a shaft 15 supported by a bracket 14, and a driven roller 18 to be pressed against the drum 13 is mounted on this shaft 17.

Since the shaft 17 is inclined along the generatrix of the conical drive drum 13, the driven roller 18 can contact the conical surface of the drum 13 without being biased. 2 is attached in a freely rotatable state.

For winding, the roller 2 is coated with rubber so that the wound yarn does not slip, and the driven roller 18 is coated with rubber so that it does not slip between it and the drive drum 13.

As a means for pressing the driven roller 18 against the drum 13,
The arm 16 is equipped with a spring 23, so that there is no slippage between the two.

For winding, in order to position the separator 1 in correspondence with the roller 2, a shaft 17 is attached to the tip of an arm 19 protruding from the inclined shaft 17.
Attach the bar 20 parallel to the separator 1.
Equipped with

The structure for changing the number of rotations of the roller 2 is located at the driven roller 18, and as shown in FIG. Since the boss portion of the driven roller 18 is fitted into this, the driven roller 18 can move along the key 21 in the longitudinal direction of the shaft 17, and is also held at a predetermined position by a set screw 22 screwed into the boss portion. Can be maintained.

Due to dry running, and the winding was due to changing the number of roller rotations,
The driven roller 18 can be separated from the drive drum 13 at any time.

That is, a bundle 26 is attached to a shaft 25 that protrudes from the bracket 24 that is integrated with the bracket 14, and when this bundle 26 is operated against the spring 23, a part of the protruding pin 27 pushes up the arm 16. Therefore, as shown in FIG.
The winding can stop the rotation of the roller 2 by a displacement shift, in particular by the driven roller 18 moving away from the continuously rotating drive drum 13.

28 is a stopper for the bundle 26.

When changing the number of rotations of the winding roller 2 due to a change in weaving conditions, rotate the bundle 26 to move the driven roller 18 away from the drum 13, and loosen the set screw 22 to rotate the driven roller 18. Allows movement along key 21.

If the roller 2 is moved to the large diameter side of the drum 13, the winding speed can be increased, and if it is moved to the small diameter side, the winding speed can be reduced.

In this moving operation, the driven roller 18 can be moved independently without changing the position of the winding roller 2 and separator 1.

When the bundle 26 is returned after the movement operation, the driven roller 1
8 comes into pressure contact again with the drive drum 13 without being biased, and the changed speed can be transmitted to the winding roller 2.

As described above, in the device of the present invention, the driven roller 18 can be moved and adjusted independently, so that the winding can be performed by changing the speed of the roller 2 while maintaining the weft sending position from the separator 1 to the stored weft injection nozzle 3 at a fixed position. Therefore, it is possible to stabilize the weft delivery and storage action.

In addition, while maintaining the running state of the weft yarn Y that connects the separator 1 and the stored weft injection nozzle 3 and the weft yarn Y' that connects the tension applying device 4 and the separator 1 so that there is little resistance, Since the winding speed of the roller 2 can be changed, there is no need to worry about the yarns Y and Y' coming off from the separator 1, and the desired flying speed of the weft yarn can always be obtained even when the fluid is jetted. is capable of promoting rapid weft insertion movement.

[Brief explanation of the drawing]

The figures show an embodiment of the device of the present invention, and Fig. 1 is an overall perspective view;
FIG. 2 is a partially sectional front view, and FIG. 3 is a side view showing the displacement state of the driven roller with respect to the drive drum. 1...Separator, 2...Roller for winding, 3...Weft storage device spray nozzle, 4...
...Tension applying device, 5...Cheese, 6...
... Weft storage device, 9 ... Weft insertion nozzle, 1
3... Conical drive drum, 17... Shaft for tilted mounting, 18... Driven roller 21... Key 22... Set screw means of change.

Claims (1)

[Scope of utility model registration request] The yarn is continuously drawn out from the supply source by a weft length measuring device, a predetermined length is temporarily stored in a weft storage device separate from the length measuring device, and the yarn is inserted into the warp opening by jetting fluid from a weft insertion nozzle at appropriate times. In a shuttleless loom designed to emit air to
The weft length measuring device has a conical drive drum 13 that rotates continuously, an inclined mounting disposed parallel to the generatrix of the drum 13, and a shaft 17, and the inclined mounting is integrally and rotatably mounted on the shaft 17. The winding device consists of a driven roller 18 that presses against the roller 2 and the drive roller, and a separator 1 that wraps the yarn connected to the yarn supply source several times between the roller 2 and the driven roller 18. A weft length measuring device for a shuttleless loom, characterized in that only the driven roller 18 is configured to be able to be independently displaced in the axial direction in order to change the position of pressure contact with the drive drum 13.