Method for monitoring the application of paraffin on a traveling yarn

US6039282A · kind A · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

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

Key dates

• Filing date: Dec 21, 1998
• Grant date: Mar 21, 2000
• Expiry date: Dec 21, 2018

Classification

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

Abstract

In order to improve the traveling and sliding properties of a yarn during its further processing, in particular for knitting, it is waxed during rewinding in cheese winding machines by passing it along a paraffin body. When the paraffin body is used up, the unwaxed yarn can cause yarn breaks or even needle breakages, which leads to production errors or lost production. At the winding stations, the drive of the friction drum is switched on and off at intervals to cause alternating acceleration phases with slippage between the friction drum and the bobbin and intervening slippage- free run-out phases to prevent pattern windings. The slippage is monitored over the course of the winding operation. If the slippage decreases in successive acceleration phases and remains at a low level, while the drive output of the friction drum remains unchanged, this is interpreted to indicate an outage of the paraffin application.