Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Patent
1980-08-25
1982-12-07
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
57352, D02G 102
Patent
active
043620116
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to false-twisting equipment. More particularly, the invention relates to false-twisting equipment which comprises a yarn feed bobbin and heater disposed on one side of an operation space and a winding device disposed on the other side of the operation space, wherein a yarn to be processed is travelled from one side of the operation space to the other side of the operation space while passing through the upper portion of the operation space and the yarn is subjected to a treatment such as false-twisting under heating during this travel.
BACKGROUND ART
In false-twisting equipments, the length of a yarn heater has been increased with elevation of the yarn travelling speed. In the case where a yarn taken out from a yarn feed bobbin is passed through a vertical first heater, there is often adopted a method in which after the yarn is taken out from the upper portion of the vertical first heater, the moving direction of the yarn is changed by a guide pin and is transferred to the opposite side of an operation space. The yarn is false-twisted by a false-twisting device disposed in the upper portion of the operation space. In false-twisting equipment of this type, the first heater has a certain length determined depending on the yarn speed and heater temperature required for setting twists, and the height of this heater is much larger than the height of a second heater or winding device disposed on the opposite side of the operation space. Accordingly, the bending angle of the yarn bent toward the operation space in the upper portion of the first heater becomes acute, with the result that propagation of twists is inhibited and the yarn speed has to be controlled to a low level.
In this false-twisting equipment, a false-twisting spindle, a balloon control device, a cooling device and the like are disposed to treat the yarn which passes across the operation space in the upper portion thereof. Unless the yarn passes through these devices substantially in a straight line, the yarn quality is degraded.
The above-mentioned yarn guide pin disposed in the upper portion of the first heater is contaminated by smoke formed from the heated yarn and rising and escaping from a preheater and also contaminated by the yarn which is brought into frictional contact with the guide pin. If the yarn is hung on such contaminated guide pin and travelling of the yarn is started, the yarn is readily broken by a large frictional force produced at the point of contact between the guide pin and yarn.
DISCLOSURE OF INVENTION
In the false-twisting equipment of the present invention, respective devices are arranged in a reverse U-shaped region surrounding an operation space. A first heater is vertically disposed on one side of the operation space and a winding device is vertically disposed on the other side of the operation space, while the operation space is interposed between the first heater and the winding device. A creel is arranged behind the first heater and a second heater is arranged behind the winding device.
A yarn taken out from the creel is heated by the first heater and is bent in the upper portion of the first heater, and the yarn is passed through the upper portion of the operation space and is guided into the second heater from the upper portion thereof. While the yarn is being passed through the operation space, the yarn is cooled by a cooling device disposed in the upper portion of the operation space,and the yarn is false-twisted by a false-twisting device while ballooning is inhibited by a balloon control device.
The yarn is advanced in a straight line in the upper portion of the operation space, and by this straight advance of the yarn, propagation of twists in the linear portion is uniformalized and the yarn speed, therefore, can be increased. Furthermore, since the first heater is vertically disposed, smoke is smoothly discharged upward and contamination of the yarn-contacting surface is reduced. Accordingly, the frequency of exchange of yarn-contacting surfaces can be reduced.
REFERENCES:
patent: Re30159 (1979-11-01), Kubler
patent: 3782890 (1974-01-01), Howorth
patent: 3791121 (1974-02-01), Ernst
patent: 3971201 (1976-07-01), Hartig
patent: 4106274 (1978-08-01), Eaves
patent: 4201036 (1980-05-01), Shellenberg et al.
Murata Kikai Kabushiki Kaisha
Watkins Donald
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