Method and device for preparing randomly cross-wound yarn packages

US5857638A · kind A · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

• Ferdinand-Josef Hermanns · Erkelenz, DE
• Andreas Kruger · Donaurieden, DE
• Torsten Forche · Hamminkeln, DE
• Stefan Terörde · Warendorf, DE
• Heinrich Weingarten · Krefeld, DE

Key dates

• Filing date: Mar 3, 1997
• Grant date: Jan 12, 1999
• Expiry date: Mar 3, 2017

Classification

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

Abstract

A friction roller of a winding station of a winding machine is driven at a base angular velocity and is alternately accelerated and braked when the winding ratio is otherwise within a predetermined range of a selected whole number for causing slippage between the friction roller and a yarn package whereby the winding ratio is changed between values above and below the preselected range of the whole number. An evaluation device that calculates acceleration and braking values and a motor responsive to the evaluation device for driving the friction roller control the accelerating and decelerating of the friction roller when the winding ratio would otherwise be within the predetermined range of the selected whole number. Pattern windings of the yarn package are thus avoided.