Sensor activated weft tension device

US5462094A · kind A · utility

Assignee

• IRO AB · SE

Inventors

• Paer Josefsson · Borås, SE
• Kurt A. G. Jacobsson · Ulricehamn, SE
• Lars H. G. Tholander · Haverdal, SE

Key dates

• Filing date: Jul 5, 1994
• Grant date: Oct 31, 1995
• Expiry date: Jul 5, 2014

Classification

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

Abstract

According to a method and apparatus for controlling the insertion process of a weft yarn, the weft yarn is temporarily exposed to a braking friction and the yarn tension is mechanically picked-up. In order to prevent the friction from having a disturbing or damaging effect on the yarn, the yarn tension is only temporarily picked-up during certain phases of the insertion process, in order to derive information from the tension curve that is useful for the control of the insertion process. In a power loom, in particular a jet, rapier or gripper shuttle loom, a tension sensor for sensing the tension of the weft yarn can be switched during insertion between its sensing position and a passive position in which it does not touch the weft yarn. Preferably, the tension sensor is integrated in the insertion brake or even forms the braking element itself.