Method and apparatus for monitoring winding density in producing random-wound yarn packages

US6302349A · 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: Oct 16, 2001
• 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

Random wound yarn packages are produced at a winding station of a winding machine having a friction roller for driving the yarn package being wound by: winding yarn onto an initially empty bobbin core with the friction roller to form a finished random wound yarn package; and, during the winding, continuously (i) detecting with sensors a value representative of the angular velocity of the yarn package and a value representative of the angular velocity of the friction roller, and (ii) calculating a value representative of yarn application of the yarn package being wound, which is indicative of yarn package quality, based on the detected values. The yarn application value can be calculated based on a number of revolutions of the yarn package or based on a winding time of the winding process, and the yarn application values can be recorded as a function of time for later reference or display. Calculation of the diameter of the yarn package being wound is also provided, and yarn application values can be recorded as a function of the diameter. When the calculated diameter at least equals a threshold value, the winding process is stopped. Moreover, yarn application values are compared to…