Method and apparatus for the manufacture of core yarn in an open-end spinning device

US4083173A · kind A · utility

Assignee

• Schubert & Salzer Maschinenfabrik AG · DE

Inventors

• Peter Artzt · Reutlingen, DE
• Albert Bausch · Burladingen, DE
• Gerhard Egbers · Reutlingen, DE

Key dates

• Filing date: May 3, 1976
• Grant date: Apr 11, 1978
• Expiry date: May 3, 1996

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D02G3/36
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A core thread is combined with staple fiber in a spinning rotor by feeding the core thread to form a loop in the fiber collection surface while feeding and withdrawing the core thread in a manner to maintain it substantially linear, and the stable fiber is spun into an outer yarn shroud twisted about the axis of the core thread. The core thread feed tube is located at one side of and spaced from a diametral plane through the fiber collection surface, and the fiber feed tube is located at the opposite side of and spaced from such plane through the fiber collection surface. A loop is formed in the core thread by delaying startup of drawoff rollers for a predetermined interval after startup of core thread supply rollers, and the loop is laid on the circumference of the fiber collection surface by rotation of the spinning rotor. The rate of core yarn drawoff is determined by the rate of core thread feed less an allowance for a slight shortening of the core thread during twisting of staple fiber onto the core thread.