Method and apparatus for variably braking the weft thread between a supply spool and a thread store in a loom

US6810918B2 · kind B2 · utility

Assignee

• Lindauer DORNIER Gesellschaft mbH · DE

Inventors

• Werner Birner · Gettorf, DE
• Herbert Reinhardt · Achberg, DE
• Christian Hannes · Schallstadt, DE

Key dates

• Filing date: Oct 16, 2002
• Grant date: Nov 2, 2004
• Expiry date: Apr 2, 2023

Classification

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

Abstract

A supply spool supplies a weft thread through an adjustable actuated thread brake and a thread tension sensor to a weft thread accumulator, from which an accumulated insertion length of the thread is provided to a weft insertion device. The tension sensor provides a measured actual thread tension signal to a control arrangement, which compares the actual tension to a selected rated tension, and, dependent on the deviation therebetween, provides a control signal to an actuator of the thread brake, so that the actual thread tension constantly corresponds to the selected rated tension. Another sensor provides a signal indicating a change from an empty spool to a full spool. Responsive thereto, the control arrangement actuates the thread brake to an adjustable starting brake setting as a coarse adjustment. Then the self-regulating fine adjustment is continued. A constant winding tension and thread accumulation length are achieved in the thread accumulator.