JPH0260770B2 - - Google Patents

Description

Detailed Description of the Invention Field of Industrial Application The present invention involves intersecting a pair of endless false-twisting belts with their surfaces in surface contact, and using the contact surface as a false-twisting surface. The present invention relates to a yarn threading method in a belt-type false twisting device, which applies false twist to the nipped yarn by nipping the yarn and running an endless false twisting belt.

〓Conventional technology〓 A pair of endless false-twisting belts are intersected with their surfaces in surface contact, and the contact surface is used as a false-twisting surface.The yarn is nipped on this surface and the endless false-twisting belt is run. In a belt-type false twisting device that applies false twist to the twisted yarn, the number of twists applied to the yarn changes depending on the nip pressure on the false twisting surface, and the greater the nip pressure, the greater the number of twists.

Immediately after the yarn or staple fiber bundle (hereinafter referred to as yarn) is inserted into the false twisting surface,
Since the thread is in a flat state, it is difficult to twist it.

Therefore, if the nip pressure immediately after insertion into the false twisting surface is made equal to the nip pressure in the steady state, it will be difficult to twist immediately after insertion. If the value is increased, the twist will be too high during steady state, which will cause yarn breakage.

〓Problems to be Solved by the Invention〓 The present invention involves intersecting a pair of endless false-twisting belts with their surfaces in surface contact, using the contact surface as a false-twisting surface, and nipping the yarn on the surface to create an endless belt. When false twisting is applied to the nipped yarn by running a false twisting belt, the best nip pressure to apply to the false twisting surface is different between yarn threading and steady twisting. The purpose is to change the nip pressure appropriately when twisting.

〓Means for solving the problem〓 A pair of endless false-twisted belts are intersected with their surfaces in surface contact, the surface contact portion is used as a false-twisting surface, and a yarn is passed between the false-twisting surfaces. The nip pressure on the false-twisting surface of the belt-type false-twisting device that applies false twisting to the yarn is 10 to 30% higher than that during normal twisting only when threading.

〓Operation〓 A pair of endless false-twisted belts are intersected with their surfaces in surface contact, and the contact surface is used as a false-twisting surface, and the yarn is nipped externally. A pressure member that can press the false twisting surface from within the ring of the endless false twisting belt is provided, and the pressure of the pressure member is adjusted as appropriate depending on the twisting process such as threading or steady twisting. Pressure is applied to the false twisting surface.

Due to this change in pressure, the nip pressure on the false twisting surface is increased by 10 to 30% during yarn threading compared to normal twisting.
I raised it.

〓Example〓 An example of the false twisting unit 1 for carrying out the method of the present invention will be described below with reference to the drawings.

A base 4 is provided at the top of an arm 3 rotatably supported by a support shaft 2 provided through a spinning device in which a plurality of spinning units each including a draft device, an air injection nozzle, and a false twisting unit 1 are arranged in a row. The base 4 has a first endless belt support arm 5 and a second endless belt support arm 5.
The endless belt supporting arms 6 are fixed with bolts 7 and 8, respectively. A driven pulley 11 is pivotally supported on the first endless belt support arm 5 by a bearing member 10 that is slidably guided by a guide bar 9. Also,
A first drive shaft 13 is supported by a bearing 12 through the first endless belt support arm 5 and the base 4. A drive pulley 14 is provided at the top of the first drive shaft 13, and a driving pulley 15 is provided at the bottom end. Further, an endless false-twisting belt 16 is stretched between the driven pulley 11 and the driving pulley 14. The belt 16 is always urged in a tensioned direction via the bearing member 10 by a spring 17 fitted into the guide bar 9.

Further, the first endless belt support arm 5 supports the swinging arm 18 by a shaft 19 and is provided with an air cylinder 20. A piston shaft 21 of the air cylinder 20 is connected to the side of the swing arm 18, and the swing arm 18 performs a swing motion by the operation of the air cylinder 20. A belt-pressing pulley 22 is provided at the tip of the swinging arm 18, and can come into contact with the inner side of the endless false-twisting belt 16 near a false-twisting surface 23, which will be described later, when swinging.

A bearing 2 is provided at the base of the second endless belt support arm 6.
A second drive shaft 28 is provided by 7, and similarly to the first endless belt support arm 5, a shaft bearing member 30 is slidably supported by a guide bar 29.
8 and a shaft (not shown) supported by a bearing member 30, a driving pulley 31 and a driven pulley 32 are provided, respectively, and an endless false-twisting belt 33 is stretched between both pulleys. The belt 33 is tensioned by the bearing member 30 receiving the elastic force of the spring 34. The base 4 further supports a driving pulley 36 by a shaft (not shown) supported by a bearing member 35, and the base 4 is provided between the driving pulley 36 and a drive shaft pulley 37 provided at one end of the second drive shaft 28. A drive belt 40 is spanned through an intermediate pulley 39 supported by 4. Driving pulley 15, 36
The drive belt 41 receives power from a prime mover (not shown) and is installed along the longitudinal direction of the machine.
are in contact with each other.

The false twisting unit 1 has drive pulleys 15 and 36 in contact with a drive belt 41, and receives power from the drive belt 41 to rotate them. The rotation of the first drive shaft 13 due to the rotation of the driving pulley 15 causes the drive pulley 14 to rotate, and the first endless false-twisted belt 16, which is stretched between it and the driven pulley 11, to rotate. On the other hand, the rotation of the drive pulley 36 rotates the drive shaft pulley 37 and the second drive shaft 28 via the intermediate pulley 39, resulting in the rotation of the drive pulley 31. The rotation of the driving pulley 31 causes the second endless false-twisted belt 33, which is stretched between the driven pulley 32 and the driving pulley 31, to rotate. Therefore, the yarn 24 held between the false twisting surfaces 23 of the first and second endless false twisting belts 16 and 33 that are in cross-pressure contact is twisted and false twisted.

During the above-mentioned twisting, the air cylinder 20 is operated to introduce the yarn to the nip point of the false twisting surface 23, and the swinging arm 18 is operated by the piston shaft 21 of the air cylinder 20.
Control the pressing force and keep the nip pressure at steady state between 10 and 30.
Set it as % high. By increasing the nip pressure in this way, even if the yarn is flat at the beginning of threading, it can be twisted well. Then, as time passes, the required amount of twist is applied to the yarn passing through the false twisting surface and the yarn gradually becomes rounded, after which the nip pressure is lowered and the increase in the amount of twist added is stopped. If the nip pressure is kept as it is, the amount of additional twist will gradually increase and eventually the thread will break as if the thread were threaded.

The above-mentioned reduction in the nip pressure after the start of twisting is carried out by using a timer to reduce the amount of protrusion of the piston shaft 21 of the air cylinder 20 as time elapses.

In the illustrated example, endless false twisted belts 16, 3 are crossed.
In the vicinity of the false twisting surface 23 of No. 3, the endless false twisting belt 16 is tightened with a pulley 22 from inside the ring of the endless false twisting belt 16.
Although the inside of the false twisting surface 23 is pressed, it goes without saying that the pressing position may be inside the false twisting surface 23.

If the increase in nip pressure during threading is less than 10%, the effect of twisting on flat yarn will be small, and the twisting will not be done enough and the thread will break as a result. Therefore, increase the nip pressure by more than 30% If this is the case, you will see thread breakage when the thread is twisted too much.

Effects of the Invention The method of the present invention involves intersecting a pair of endless false-twisted belts with their surfaces in surface contact, using the surface-contacting portion as a false-twisting surface, and passing a yarn between the false-twisting surfaces. When false twisting is applied to the yarn, the nip pressure on the false twisting surface is increased by 10 to 30% during yarn threading compared to normal twisting. It can be twisted well, and since the nip pressure is returned to the steady state when twisting in a steady state, yarn breakage does not occur due to excessive twisting.

[Brief explanation of drawings]

Figure 1 is a front view of the false twisting unit, Figures 2 and 3 are
The figures are sectional views taken along the - line and - line in Fig. 2, respectively, and Fig. 4 is a plan view of the belt pressing member. 16, 33... Endless false twisted belt, 23... False twisted surface.

Claims (1)

[Claims] 1 Belt type false twisting in which a pair of endless false twisting belts are crossed with their surfaces in surface contact, the surface contact portion is used as a false twisting surface, and a yarn is passed between the false twisting surfaces and the yarn is false twisted. A thread threading method in a belt-type false twisting device, characterized in that the nip pressure on the false twisting surface of the device is increased by 10 to 30% only during thread threading compared to during normal twisting.