JPS623734B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic threading method for automatically threading running yarn onto a winder in the process of manufacturing threads such as synthetic fibers, and particularly to a high-speed winder. This invention relates to an automatic threading method that dramatically improves threading success rate.

In recent years, even in the textile industry, machinery automation and labor saving have been actively carried out in various processes, and efforts are being made to break away from the traditional labor-intensive industry. As part of this, for example, in the spinning and winding process, there is an automatic winder that can start and stop automatically, an auto-doffer that replaces a fully wound package with an empty bobbin, and an automatic winder that automatically threads the yarn into the winder. Automatic threading devices have been developed and are now being used as production equipment. However, in order to fully utilize the effects of the automatic threading device as described above, it is of course necessary to maintain an extremely high threading success rate. Multiplication is a very difficult problem for the following reasons.

In other words, in order to obtain a good wound package shape under high-speed conditions, the winding angle, contact pressure, and tension are important factors, and it is known that the winding tension has a particularly large effect. . Therefore, in order to obtain a good winding package shape, it is required to wind the yarn with the lowest possible winding tension, but if the yarn is wound under such a low tension condition, the final Yarn sagging occurs instantaneously between the yarn feeding roller of the stage and the winding machine, and the running yarn is likely to wind around the roller, causing a failure in threading. When threading is done manually, even if a threading failure occurs due to the reasons mentioned above, the problem is not so great because it is possible to immediately rethread the thread. However, when the automatic threading device sequentially threads a large number of arranged winders, it is virtually impossible to rethread the thread. For this reason, it is absolutely necessary to maintain a high first thread threading success rate.

The present invention has been made to meet such demands. That is, the present invention provides an automatic threading method in which threading is automatically carried out on a thread winding machine by a thread threading means, in which a thread is connected between a yarn feed roller at the final stage and a traversing guide of the winding machine. A tension generator using compressed air force is provided, and the operation of the tension generator can be controlled from the automatic threading device side, and the tension generator is activated immediately before threading and is inactivated after threading is completed. This is an automatic threading method characterized by:

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of the automatic threading method according to the present invention, in which a yarn Y is spun from a spinneret 1, passes through yarn feed rollers 2 and 3, passes through a traversing fulcrum guide 4, and is wound. After being traversed by traverse devices 6, 6' attached to the taker body 5, it is wound onto a bobbin 8 which is frictionally driven by a friction roller 7. 9 is a tension generator provided between the final stage yarn feed roller 3 and the winding machine main body 5; 10 is a mechanical valve that turns on and off the supply of compressed air to the tension generator 9;
When the valve is pressed, compressed air passes through the valve, and the tension generator 9 is activated. Next, the automatic threading device will be explained.

In the figure, A is a general automatic threading device, which is guided by a rail 11 or the like and is disposed so as to be movable on the front surface of the spinning machine. Reference numeral 12 denotes a suction gun provided in this automatic threading device A, which is designed to perform a three-dimensional or two-dimensional movement while sucking and taking up the yarn Y to carry out necessary threading operations (of course). This operation may be the main one or the auxiliary one). Further, the automatic yarn hooking device A includes a fluid pressure cylinder 13 for switching a mechanical valve 10 on the spinning machine side as an interlocking mechanism for activating and inactivating the tension generator 9 on the spinning machine side.
(In addition to this system, other means such as a photoelectric switch can also be used as the interlocking mechanism.)

As shown in FIGS. 2 and 3, the tension generator 9 surrounds a main body 15 having a hollow part (diff user) 16 extending toward the end through which the running yarn Y passes, and is fitted with the outer periphery of the main body 15. A pressure chamber 20 for compressed air is formed between the holder 18 and the main body 15. Furthermore, the main body 15 has a nozzle 17 (in this embodiment, 3
The holder 18 is provided with a supply port 19 for introducing compressed air into the pressure chamber 20. Also, a through hole 21' is provided at the top of the hollow part 16.
A ring-shaped thread guide 21 is fixed thereto. Reference numeral 22 denotes a slit for introducing the running yarn into the hollow portion 16 (including the through hole 21') which is bored along the axial direction of the tension generator 9.

Here, the compressed air supplied from the supply port 19 to the pressure chamber 20 passes through the nozzle 17 and is ejected into the hollow part 16 of the main body 15, where it rapidly expands and is discharged to the outside through the widening part of the hollow part 16. . During this time, the pressure energy of the compressed air is converted to velocity energy,
A large stirring force is applied to the running yarn Y in the direction of the arrow in FIG.

Next, the effects of the present invention will be explained. First, when automatic yarn hooking device A moves to a predetermined front position of the spinning machine and is in a standby state, when it receives a full winding command from the spinning machine side, it operates a yarn cutter (not shown) and cuts the running yarn downstream of the traversing fulcrum guide 4. The Y is cut and suctioned by the suction gun 12 located above the winding machine body 5. Thereafter, the fully wound package of the winding machine and the empty bobbin are replaced, automatic threading operation is started, and the suction gun 12 performs a predetermined operation to thread the thread. Immediately before entering the final stage of this threading operation, a signal is issued in accordance with the operating sequence to operate the fluid pressure cylinder 13, and the switching pusher 1
Mechanical valve 10 on the spinning machine side by protruding 4
Press to activate the tension generator 9. When the tension generator 9 is activated, the tension of the running yarn Y downstream of the final stage yarn feed roller 3 increases. Here, the purpose can be sufficiently achieved if the tension is increased by about 50 to 150% of the normal winding tension. Under such conditions the final stage of the threading operation is carried out. That is, the running yarn Y, which has been suctioned by the suction gun 12, is wound onto the empty bobbin and normal winding begins. As is clear from the above explanation, immediately before the actual threading operation, the tension downstream of the roller 3 increases, so that the yarn sagging that conventionally occurs during threading disappears, and the running yarn is transferred to the roller 3. Wrapping and breakage of the thread can be completely prevented. After normal winding is started, the fluid pressure cylinder 13 is immediately activated to return the switching pusher 14 to its original position. As a result, mechanical valve 10
is restored, and the tension generator 9 on the spinning machine side becomes inactive.

As explained above, according to the present invention, by appropriately selecting the pressure and flow rate of the compressed air supplied to the tension generator, the yarn tension downstream of the final stage roller immediately before threading can be adjusted to the required level for threading. Since it becomes possible to obtain a sufficient tension value by using the automatic threading device, it is possible to significantly improve the success rate of threading on the high-speed winding machine, and to fully demonstrate the effectiveness of the automatic threading device. . Further, since the operating time of the tension generator is usually about 1 to 5 seconds, the amount of compressed air consumed is about 0.05 m ³ per treated yarn, so there is no cost problem at all.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a spinning machine and automatic threading device suitable for carrying out the present invention, and FIGS. 2 and 3 are a cross-sectional view and a longitudinal cross-sectional view of a tension generator. 3 is a thread feed roller, 4 is a traversing fulcrum guide, 9
is a tension generator.

Claims (1)

[Claims] 1. In an automatic threading method in which yarn is automatically threaded onto a thread winding machine using a thread threading means, a compressed air force is used between the final stage thread feed roller and the traverse guide of the winding machine. A tension generator is provided, and the operation of the tension generator can be controlled from the automatic threading device, and the tension generator is activated immediately before threading and is inactivated after threading is completed. Automatic threading method.