Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Patent
1998-02-12
2000-02-08
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
28240, 28243, 28245, 57287, 57288, D01H 746
Patent
active
060216328
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for the production of thick/thin effects in a filament yarn, which is stretched in at least one stretching zone limited respectively by an inlet filament-engaging mechanism and an outlet filament-discharge mechanism, whereby between the inlet filament-engaging mechanism and the outlet filament-discharge mechanism a heating device in the form of a heating element (20.1) touched by the filament yarn is arranged. Means are privided for the interruption of heat supply.
BACKGROUND OF THE INVENTION
According to one embodiment, in the above-mentioned device (see German Patent 195 29 315) it has been proposed to use a mechanism for lifting the filament yarn from a stationary heating device within the stretching zone, at defined intervals during stretching. The stretching zone is limited by two gallet/transfer roller combinations, between which the mentioned mechanism and the stationary heating device are arranged. The stretching zone can also be limited, at least on one side, by a pair of feeding rollers (with lower/upper rollers).
In the aforementioned construction it can happen that the mechanical arrangement causes the. The mechanical arrangement in this application can cause the filament yarn to vibrate, which results in uncontrollable movements of the filament yarn.
OBJECT OF THE INVENTION
It is the object of the present invention to provide an improved apparatus in which the filament yarn is deflected as little as possible during the heat transfer in both treatment stages (heated and not heated).
SUMMARY OF THE INVENTION
This object is attained in accordance with the invention in that the heating surface of the heating element acting on the filament yarn is the periphery of at least one disk driven about an axis with at least one region whose radius is reduced with respect to the axis. According to the invention it is proposed to move the heating element and not the filament yarn. The disk and the yarn path are so arranged with respect to one another that the filament yarn has a tangential contact with the disk periphery, and this contact does not follow the indentation, i.e. the reduced radius of the disk.
When the filament yarn runs over the circumference of the rotating heated disk, the yarn length touched by the disk is thereby heated and, is stretched, while the yarn length which does not touch the disk in the indentation of the disk remains cold and therefore is not stretched.
This area remains as the thick effect in the filament yarn.
Due to the fact that the yarn has only tangential contact with the disk, its deflection is minimal between the contact with the periphery and the lack of contact in the region with reduced radius, and therefore advantageously no vibration occurs. The ability to reproduce the thin and thick portions and the quality of the effect yarn is improved.
Yarn speed, the rotational speed of the disk and the number of regions with reduced disk radius determine the number of the thick areas along the filament yarn. The length of the recess, i.e. of the area with reduced radius, determines the length of the thick regions in connection with the yarn speed and the rotational speed, as well as the thickness of the disk. Therefore the length of the thick regions can be determined only by changing the length of the regions with reduced radius along the disk periphery, independently of on the number of thick regions along the filament yarn.
Advantageously any such disk can be replaced by disks having a different length of the region with reduced radius along the disk periphery.
In a further embodiment of the invention two disks can be arranged at a distance from one another and for instance can be driven with rotational speeds which do not depend on one another.
Alternately one disk can consist of two or more disk parts which can be rotered with respect to one another as to their respective regions with reduced radius.
In one of the embodiments of the invention the axis of rotation of the disk can be at least approximately
REFERENCES:
patent: 3949041 (1976-04-01), Schwarz
patent: 5760374 (1998-06-01), Schippers et al.
patent: 5822971 (1998-10-01), Bauer
patent: 5836146 (1998-11-01), Konig
Dubno Herbert
Stryjewski William
Zinser Textilmaschinen GmbH
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