Yarn tension sensor for a textile machine

US5329822A · kind A · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

• Robert Hartel · Aachen, DE
• Karl-Josef Hoehne · Cologne, DE
• Ferdinand-Josef Hermanns · Erkelenz, DE
• Herbert Henze · Rheydt, DE
• Herbert Knors · Wittlich, DE
• Dietmar Engelhardt · Mönchengladbach, DE
• Wilhelm Zitzen · Wittlich, DE
• Manfred Veyes · Wittlich, DE
• Herbert Merkens · Erkelenz, DE
• Wolfram Weissenfels · Wittlich, DE
• Hermann Ruetten · Viersen, DE
• Dirk Jaegers · Rheydt, DE
• Berndt Pommer

Key dates

• Filing date: Sep 4, 1992
• Grant date: Jul 19, 1994
• Expiry date: Sep 4, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65H2701/31
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention to a yarn tension sensor, in particular for yarns traveling at high speed, to accurately ascertain even short-term yarn tension fluctuations. According to the invention, a yarn guide element is mounted on one head end of a plunger coil disposed in a magnetic field. A position sensor is disposed in the region of the plunger coil and detects even minimal changes in position of the plunger coil. These changes in position are reported to a controller, at whose output variations in current are generated and supplied to the winding of the plunger coil, the variations being such to compensate for the axial force generated by the yarn and acting upon the plunger coil, thereby making the plunger coil virtually motionless.