JPS6411729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for threading a yarn at the start of spinning in a pneumatic spinning machine.

Along with ring-type and open-end type spinning machines, pneumatic spinning machines have appeared in recent years,
There are various types and models of pneumatic spinning machines, and various improvements are being attempted with the aim of improving yarn quality and increasing speed. In such a pneumatic spinning machine, the present invention
A method for smoothly threading yarn at the start of spinning in an apparatus having an air injection nozzle that applies a swirling air flow to a staple fiber bundle, and a false twisting device that applies false twist to the fiber bundle exiting the nozzle. This is what we provide.

The above-mentioned false twisting device does not apply false twist to the yarn using compressed air, but refers to a device that twists the yarn by directly contacting the staple fiber bundle, such as the known belt type or friction type. This is called a false twisting device. This contact type false twisting device is useful when bulking a filament bundle, but when this false twisting device is applied to a spinning machine in combination with the above-mentioned air injection nozzle, it is more effective than a conventional pneumatic spinning machine. It has been confirmed that much faster spinning speeds may be possible.

However, when threading is carried out in a pneumatic spinning machine using the above-mentioned contact type false twisting device, the fiber bundle at the time when the tip has left the air injection nozzle and has not yet been introduced into the false twisting device is Since it is not subjected to the false twisting effect, it does not have sufficient strength and is in an extremely unstable state. Therefore, even if such a fiber bundle is simply introduced into a contact type false twisting device using a suction gun or the like, it will easily be cut off due to friction with the false twisting device, etc.
This causes the problem of not being able to thread the thread. This problem can be avoided by lowering the spinning speed, but this cannot meet the demand for high-speed spinning.

The present invention has focused on these circumstances and aims to solve the above problems, and provides a threading method that allows threading to be carried out easily and reliably and is suitable for high-speed spinning. .

Embodiments of the present invention will be described below based on the drawings.

The figure schematically shows a pneumatic spinning machine to which the present invention is applied, in which 1 is a draft device consisting of a back roller 2, a middle roller 4 having an apron 3, and a front roller 5, respectively. Staple fiber bundle S introduced from the rear of cross crawler 2
After passing through the draft device 1 and being drafted to a predetermined thickness, the air is introduced into the air injection nozzle 6 located in front of the front roller 5. The nozzle 6 directs the compressed air flow swirling in a certain direction to the fiber bundle S.
Due to the air flow, the staple fiber bundle S forms a balloon between the contact point of the front roller 5 and the nozzle inlet 7 and within the air injection nozzle 6. The staple fiber bundle S that has exited the air injection nozzle 6 is further introduced into the belt-type false twisting device 8 in front, where it becomes a spun yarn Y and is transferred to the delivery roller 9.
The package P is then wound onto a bobbin B which is rotated by a friction roller 10. The belt-type false-twisting device 8 has two endless false-twisting belts 11 and 12 wound between a driving pulley 13 and a driven pulley 14, respectively, and both belts 1
1 and 12 are brought into contact with each other and crossed in an X shape, and the staple fiber bundle S includes both belts 1
It is nipped between the intersecting planes of 1 and 12, and the drive pulley 1
3 and 13, both belts 11 and 12 run to twist the fiber bundle S and send it out to the right in the drawing. At this time, the direction of action of the twisting force applied to the staple fiber bundle S is the direction in which the twisting force is applied to the staple fiber bundle S.
The twist formed on the staple fiber bundle S by the twisting force propagates to the front roller 5. The staple fiber bundle S twisted in this manner is swung around by the balloon from the air injection nozzle 6, causing each fiber to slip or untwist. This slip phenomenon is promoted by the swirling airflow of the air injection nozzle 6, and also by friction with the narrow inlet 7 and outlet 15 of the nozzle 6. After passing through the false twisting device 8, the staple fiber bundle S having slips is subjected to a strong untwisting action, and this untwisting action twists each of the fibers that have slipped, resulting in actual twisting. A spun yarn Y containing intertwining is formed.

Next, a method of threading the above-mentioned pneumatic spinning machine will be explained.

At the start of spinning, each part of the spinning machine is driven at once, and the belt-type false twisting device 8 is operated to separate the belts 11 and 12 from each other. Next, the staple fiber bundle S is pulled out from a can or the like (not shown), introduced into the draft device 1 from the side of the bat crawler 2, and then passed through the air injection nozzle 6, after which the tip of the fiber bundle S is Aspirate. By keeping the front roller 5 and the air injection nozzle 6 close to each other, the staple fiber bundle S can be easily introduced into the inlet 7 of the nozzle 6, and the swirling airflow of the nozzle 6 can be directed toward the nozzle outlet 15. By ejecting the air in a spiral manner, the air can easily pass through the air injection nozzle 6.

Next, the filament bundle F is pulled out from a separately prepared package (Pf), introduced from behind the front roller 5, passed through the roller 5, and then passed through the air injection nozzle 6 in the same manner as the staple fiber bundle S. and let the suction gun 16 suck it. Reference numeral 17 is a guide pipe for easily guiding the filament bundle F to the rear of the front roller 5, and reference numeral 18 is a compressed air jetting pipe that communicates with a part of the pipe 17. By slightly inserting the tip of the filament bundle F into the guide pipe 17 and temporarily jetting out compressed air from the jet pipe 18, the filament bundle F is reliably introduced into the front roller 5. At this point, the staple fiber bundle S has not yet been given sufficient convergence and is in an unfinished and unstable state as a spun yarn.
By intertwining and integrating the material, it becomes strong and cannot be easily cut.

Next, the suction gas 16 is operated to position the fiber bundle S and the filament bundle F between the belts 11 and 12 of the belt type false twisting device 8, and then
The false twisting device 8 is operated to bring both belts 11 and 12 into contact with each other at a constant pressure to start false twisting. From this moment on, the false twisting belts 11 and 12 twist the staple fiber bundle S strongly;
Since they are integrated with the filament bundle F and given strength, they are not easily cut, and the above-described twist is formed on the fiber bundle S by the false twisting device 8. The fiber bundle S and the filament bundle F are further passed through a delivery roller 9, and the state at this time is shown in FIG.

After confirming stable running of the staple fiber bundle S, the cutter 19 is operated to cut the filament bundle S on its yarn feeding side, and the supply of the filament bundle S is stopped. The remaining traveling filament bundle F is completely sucked into the suction gas 16, and only the staple fiber bundle S remains, which is removed from the gun 1.
6, the complete spun yarn Y is in a state of being sucked.
At this time, since the staple fiber bundle S between the front roller 5 and the false twisting device 8 is twisted by the false twisting device, the fiber bundle S is not easily cut. Next, by operating the suction gun 16 and threading the obtained spun yarn Y onto the empty bobbin B, winding of the spun yarn Y is started, and the normal operating state shown in FIG. 2 is established.

According to the method described above, threading can be carried out at high speed spinning of 300 to 600 m/min, and the threading operation is also easy.

Note that in this method, other filamentous materials may be used instead of the filament bundle S. That is, as long as it is thin and continuous and has a certain degree of strength, it may be, for example, cotton yarn or various fiber bundles. Further, the filamentous material is not limited to the front roller 5, but can also be inserted from the front of the back roller 2 or the middle roller 4, or directly at the inlet 7 of the air injection nozzle 6.
It may also be introduced into the nozzle from above. Furthermore, it is also possible to introduce the filamentous material into the air injection nozzle 6 first, and then introduce the staple fiber bundle S. Furthermore, in addition to the belt-type false-twisting spindle 8, the method of the present invention is suitable when using a friction-type false-twisting device using a plurality of rotating disks, or the above-mentioned contact-type false-twisting device. includes all of these.

As explained above, according to the present invention, it is possible to easily and reliably carry out yarn threading at the start of spinning in a pneumatic spinning machine capable of high-speed spinning. I was able to overcome the problems.

[Brief explanation of the drawing]

The figures show an example of a pneumatic spinning machine to which the present invention is applied, with FIG. 1 schematically showing the state during threading, and FIG. 2 schematically showing the state after threading is completed. 6... Air injection nozzle, 8... Belt type false twisting device, F... Filament, S... Staple fiber bundle.

Claims (1)

[Claims] 1. A method in which, in a pneumatic spinning machine that introduces a staple fiber bundle into an air injection nozzle and a false twisting device for spinning, yarn is threaded through the nozzle and the false twisting device at the start of spinning, the method comprising: A method for threading a yarn in an air spinning machine, characterized in that the thread-like material is introduced into the nozzle and the false twisting device together with the thread-like material, and then the thread-like material is removed.