Yarn sensor

US4629137A · kind A · utility

Assignee

• Barmag Barmer Maschinenfabrik Aktiengesellschaft · DE

Inventors

• Heinz Schippers
• Erich Lenk · Remscheid, DE
• Hermann Bremer · Remscheid, DE

Key dates

• Filing date: Apr 2, 1985
• Grant date: Dec 16, 1986
• Expiry date: Apr 2, 2005

Classification

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

Abstract

A pneumatic sensor is provided for detecting and indicating the tension in running strand material, such as yarn, wire and the like. A source of compressed air is connected to an air escape nozzle having an outlet opening in one end thereof and a closing member is supported adjacent the outlet opening and is normally spaced a predetermined distance from the outlet opening to regulate and partially restrict the escape of air therefrom. The strand engages the closing member and varies the space or gap between the closing member and the nozzle outlet in accordance with the amount of tension in the strand. A pressure gauge is provided for indicating the amount of air pressure in the pneumatic pressure system and for thereby indicating the amount of tension in the running strand. A pressure/electric transducer is operable by the pneumatic pressure system and may operate a control system for a variable speed motor in a yarn take-up system to vary the takeup rate to maintain a predetermined tension on the yarn being taken up. The variation in air pressure in the pneumatic pressure system may also be utilized to operate a pneumatic cylinder for varying the braking force applied to a wire l…