Yarn piecing process and apparatus for an open end spinning assembly

US4080775A · kind A · utility

Assignees

• Fritz Stahlecker · DE
• Hans Stahlecker · DE

Inventor

• Fritz Stahlecker · Geislingen an der Steige, DE

Key dates

• Filing date: Oct 4, 1976
• Grant date: Mar 28, 1978
• Expiry date: Oct 4, 1996

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01H4/50
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Process and apparatus for yarn piecing in an open end spinning assembly are provided. The individual steps of the yarn piecing process are controlled by a predetermined piecing program whose start is triggered as a function of the running up of a previously braked down spinning rotor, so that a yarn carried back into the spinning rotor will be applied in the spinning rotor to a fiber ring at a time during which the spinning rotor has only reached a revolutionary speed that is below the operating revolutionary speed thereof. In order to avoid imprecisions in the piecing process caused by delays and/or differences in the running up characteristics of the individual spinning rotor, one or more predetermined spinning rotor revolutionary speeds are established, and upon reaching the same, the yarn piecing process is initiated and controlled.