Method and apparatus for maintaining constant winding density in the production of yarn packages

US5954289A · kind A · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

• Ferdinand-Josef Hermanns · Erkelenz, DE
• Urs Meyer · Oberwil, CH

Key dates

• Filing date: Jun 26, 1997
• Grant date: Sep 21, 1999
• Expiry date: Jun 26, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/31
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A method of producing a random wound yarn package includes driving a yarn package with a friction roller, setting and maintaining a constant yarn tension in the yarn, setting and maintaining a constant contact force between the friction roller and the yarn package being driven thereby, and temporarily regulating the yarn tension and the contact force during a time of a pattern winding zone of the winding process in order to maintain a constant winding density both before and during the time of the pattern winding zone. The winding station includes a friction roller for driving the yarn package, a yarn tensioner, a device that generates a constant contact force between the yarn package and the friction roller, and an evaluation and regulation unit that temporarily regulates the yarn tension generated by the yarn tensioner and the contact force generated by the device during the time of the pattern winding zone. A program of the evaluation and regulation unit regulates the yarn tension and the contact force by predetermined amounts and at predetermined times. Alternatively, yarn application representative of winding density is calculated based upon circumferential velocity, angular v…