JPS6120058Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a weft storage device.

In general, weft yarns pulled out from the yarn supplying body C by a yarn guide that rotates relatively around a stationary weft storage drum (hereinafter abbreviated as "storage drum") as shown in Fig. 1 are transferred to the storage drum circumference. The weft is moored on the storage drum and unwound by causing the weft locking pin 3 installed in the storage drum to protrude and sink at a preset timing on the circumferential surface of the drum. Weft yarns can be moored or unwound by weft locking pins installed externally on the storage drum facing the drum circumferential surface and coming into contact with and separating from the drum surface at predetermined timings. Storage devices have the following drawbacks. In other words, this type of weft storage device uses a pair of weft locking pins to store the weft by dividing it into sections between the weft locking pin and the weft locking pin, and winding and storing the yarn on a storage drum. Unlike the machine, the number of weft turns on the storage drum is very small, especially near the end of weft insertion.

By the way, if the loom is restarted from a loom crank angle of around 0 degrees after it has stopped due to load or other reasons, weaving steps will occur in the fabric. Therefore, especially when weaving with filament yarn, etc., the loom should be set at the crank angle that is the back center.
I have no choice but to start driving from around 180 degrees. However, the number of weft turns near this back center is less than one turn. Also, at this point, the main nozzle and sub nozzle are ejecting to cause the weft to fly. For this reason, the weft yarns have little frictional resistance on the storage drum and are successively pulled out from the yarn supply body C by the traction force of the main nozzle or the like.

Therefore, in order to avoid this, it is not possible to restart the loom that has stopped near the back center, and it is necessary to restart the loom at a crank angle of around 0 degrees where the main nozzle, etc. is not spraying. I don't get it. However, in this case, as described above, steps are created in the fabric, so every time the loom stops, steps are created in the fabric, making it impossible to weave a high-quality fabric.

This idea was proposed in view of these facts, and even if the loom is restarted near the back center after it has been stopped, the weft threads connected from the rotating yarn guide to the main nozzle will not be affected by the jets from the main nozzle and sub-nozzle. It is an object of the present invention to provide a weft storage device which prevents the weft from being let out.

That is, in order to restart the operation of the loom near the back center, when the operation preparation switch is turned on, the weft located on the drum is forcibly pressed and held on the drum, and the weft is wound around the storage drum a predetermined number of times at the earliest. After the stored weft is given a frictional resistance that prevents it from being pulled out from the storage drum even by the traction force of the main nozzle and the sub-nozzle, this pressure holding is released.

The weft storage device of this invention will be explained in more detail below based on the attached drawings.

In FIGS. 2A and 2B, 1 is a storage drum, 3 is a weft locking pin, YG is a rotating yarn guide, MN is a main nozzle, and Y is a weft. At a position spaced apart above the locking pin 3 side of the storage drum 1, a weft holding member 61 made of, for example, an elastic material is placed under a tip of an arm 63 whose arm is bent via a push spring 62, and is opposed to the surface of the storage drum. It is installed to do so.
This arm 63 is swingably supported by a pin 66 slightly inside the end opposite to the side where the weft pressing member is installed. A tension spring 68 is attached to a predetermined position on the opposite end of the arm 63, which urges the arm 63 in a clockwise direction, that is, in a direction that moves the weft presser member 61 away from the drum surface. There is. When an operation preparation button (not shown) is turned on at a predetermined position below the arm, the arm 63 is rotated counterclockwise in conjunction with the switch, and the weft presser member 61 is pressed into contact with the surface of the storage drum 1. A solenoid 67 is provided.

It is preferable that the weft pressing member 61 is configured such that the pressing force of the spring 62 and the like can be changed so that the pressing force against the storage drum surface can be changed and set as appropriate. When the loom is stopped and restarted at a crank angle of about 180 degrees, the weft is wound around the storage drum as shown in FIG. 2A. At this time, when the loom operation preparation button is pressed, the solenoid 67
is excited and rises, causing the arm 63 to rotate counterclockwise. Then, as shown in FIG. 3, the weft pushing member 61 descends into contact with the storage drum, and as shown in FIG.
Rotating yarn guide on storage drum 1 shown in
Press and hold the weft running from YG to main nozzle MN. Then, even if the main nozzle MN and sub nozzle jet start with the operation preparation switch turned on when the crank angle is about 180 degrees, the weft on the storage drum will not be pulled out by the traction force of the main nozzle MN and sub nozzle. do not have. When the loom operation start button is pressed, the loom starts to rotate, but until the next weft insertion timing, the solenoid 67 is de-energized, for example at a crank angle of around 0 degrees, and the arm 63 is moved clockwise by the force of the tension spring 68. The arm 63 is rotated to release the weft holding member 61 from pressing and holding the weft on the storage drum, and to keep the arm 63 in a position where it does not interfere with the balloon accompanying the subsequent weft insertion. Of course, the timing at which the weft holding member 61 is separated from the top of the storage drum 61 does not have to be when the crank angle is 0 degrees, as the rotation of the rotating yarn guide YG progresses and the weft locking pin 3
It goes without saying that this can be done at any time as long as the weft yarns are not pulled out one after another depending on the traction force of the main nozzle and sub nozzle due to the intervention of the weft yarn and the frictional resistance with the weft storage drum 1.

If the loom stops again for some reason and is restarted, the related mechanisms may be made to repeat the same operations as described above.

Incidentally, in the above description, a case has been described in which there is one weft locking pin, but it goes without saying that this invention can also be applied to a type in which a plurality of weft locking pins are provided.

As mentioned above, according to this invention, in order to restart a loom that has stopped once near the back center, even if the operation preparation switch is turned on and the main nozzle MN and sub-nozzles are injected in advance, the weft yarn that continues from the yarn feeder to the main nozzle is I have never experienced a time when these were played out one after another. Therefore, even when weaving filament yarn or the like, the loom can be restarted near the back center where fewer weaving steps occur, which is preferable in terms of fabric quality.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional weft storage device;
2A and 2B are side and front views showing the surroundings of the weft storage device of this invention, and FIG. 3 is a front view illustrating the operation of the weft storage device of this invention. 1...Weft storage drum, 3...Weft locking pin,
5... Tensor, 61... Weft pressing member, 62...
...Spring, 63...Arm, 67...Solenoid,
68...Tension spring, C...Yam feeder, Y...Weft,
YG...Rotating yarn guide, MN...Main nozzle.

Claims (1)

[Scope of Claim for Utility Model Registration] A weft locking pin is used to create a tight mechanism for winding and storing the weft yarn on a weft storage drum using a rotating yarn guide, and the unwinding timing of the stored weft yarn is controlled by the weft locking pin. A weft holding member is installed at a distance on the circumference of the weft storage drum, and this weft holding member controls the weft rolling of the weft storage drum in synchronization with the input of the loom operation preparation switch. The pressing contact is released at a preset timing after the weft has reached the number of windings at which the weft is not unwound due to advance jetting from the main nozzle or the like at the earliest. A weft storage device characterized in that the weft storage device is set so as to