Title: Friction disc for false twisting apparatus

Abstract: A friction disc for an apparatus for the false twisting of threads such as, for example, for crimping synthetic threads, has a thread engaging surface with a high co-efficient of friction and a convexly curved asymmetrical profile which is divided into three portions, each portion forming an arc of a circle having a different radius of curvature, the portion at the thread entry face extending over an arcuate length of about 90.degree. up to the apex of the profile and having a radius of curvature equal to between 0.4S and 0.5S, while the intermediate portion of the profile has a radius of curvature substantially equal to S and the portion of the profile at the thread exit face has a radius of curvature equal to between 0.075S and 0.1S, S being the thickness of the disc.

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Other info:

Inventors: Weigert, Hans (Schweinfurt, DT)
Patel, Kirit (Elfershausen, DT)

Application Number: 676412
Filing Date: 1976-04-13
Publication_date: 1977-04-19
Assignee: Kugelfischer Georg Schafer & Co. (Schweinfurt, DT)
Primary Class(es): 57/339 57/337
Other Classes:
US Patent Ref:

3811258	May, 1974	Batsch	57/77.
3872661	Mar, 1975	Eaves	57/77.
3901011	Aug, 1975	Schuster	57/77.
3932985	Jan, 1976	Naylor	57/77.
3940914	Mar, 1976	Schuster	57/77.
3965661	Jun, 1976	Yoshida	57/77.

Other Refs:
Primary Examiner: Watkins, Donald E.
Assistant Examiner:
Attorney: Stevens, Davis, Miller & Mosher