Textiles: spinning – twisting – and twining – Apparatus and processes – Threading up
Patent
1980-08-25
1989-02-21
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Threading up
57336, D02G 102, D01H 1500
Patent
active
048053945
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a false twisting method and false twisting apparatus. More particularly, the present invention relates to a false twisting method in which a false twist threading device capable of preliminarily false-twisting the yarn is used before a yarn is nipped and false-twisted between two running endless belts of a false twisting device and also relates to a false twisting apparatus for carrying out this false twisting method.
BACKGROUND ART
In a false twisting apparatus for imparting false twists to yarns, yarn breakage is readily caused when the yarn is started to be false-twisted. The finer is the yarn to be treated, the more readily is caused yarn breakage. This yarn breakage is caused also in a false twisting apparatus of the type where a yarn is nipped and false-twisted between two false twisting belts running in directions opposite to each other. In this false twisting apparatus, when travel of the yarn which has been kept in the stationary state is started, the friction is highest at the contact point between the yarn and a mechanical element of the false twisting apparatus. Accordingly, in order to prevent yarn breakage, it is preferred that the yarn is kept to be separated from between the false twisting belts on starting the travel of the yarn.
After travel of the yarn has been started, the friction between the yarn and mechanical element can be reduced if the yarn is slightly false-twisted preliminarily (hereinafter referred to as "semi-twisting"), as compared with the case where the yarn is not preliminarily twisted at all.
A false twisting apparatus is ordinarily laid out so that a yarn taken out from a yarn supply bobbin by a pair of feed rollers is introduced to a winding device through a heater, a cooling device, a false twisting device and a delivery device. As pointed out hereinabove, it is preferred that when travel of the yarn is started, the yarn be slightly false-twisted, that is, semi-twisted, and that the operation of closing a rotating feed roller and the contact of the yarn with a heating plate, a cooling plate or a ballon-controlling plate be carried out in this state.
DISCLOSURE OF INVENTION
According to the method of the present invention, when a yarn is nipped at the nip point of a false twisting device including two running endless belts which are kept in intersecting contact with each other and is false-twisted in this nipped state, the yarn is preliminarily false-twisted (semi-twisted) with a twist number less than the number of twists to be imparted at the nip point and the yarn is then false-twisted at the nip point with a predetermined twist number.
By imparting the above-mentioned semi-twists to the yarn at the start of travel of the yarn, the strength of the yarn can be increased, occurrence of yarn breakage at the start of travel of the yarn can be prevented and the friction of the yarn with mechanical elements can be reduced.
In the false twisting apparatus of the present invention, a false twisting threading device for introducing a yarn to the nip point of a false twisting device including two running false twisting endless belts which are kept in intersecting contact with each other is disposed in close proximity to the false twisting device. In the false twisting threading device, the yarn to be twisted is introduced to or separated from the nip point of the false twisting device by a yarn guide of this false twisting threading device. When travel of the yarn is started, the yarn is brought into contact with the false twisting belts at the point outside the nip point to impart semi-twists to the yarn and then, the yarn is introduced to the nip point to impart a predetermined number of false twists to the yarn or the yarn is not brought in contact with the false twisting belts at all.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a front view of the apparatus according to the present invention.
FIG. 2 is a partially cut-out side view of the apparatus shown in FIG. 1.
FIGS. 3 and 4 are diagrams illustrating operations of
REFERENCES:
patent: 3701245 (1972-10-01), Richter
patent: 3733801 (1973-05-01), Jones
patent: 3842578 (1974-10-01), Schippers
patent: 3886722 (1975-06-01), Hori et al.
patent: 3971201 (1976-07-01), Hartig
patent: 4047373 (1977-09-01), Takai
patent: 4149366 (1979-04-01), Bass et al.
Murata Kikai Kabushiki Kaisha
Petrakes John
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