Roller drive for draw frame

US4314388A · kind A · utility

Assignee

• Zinser Textilmaschinen GmbH · DE

Inventors

• Max Hartmannsgruber · Tauberbischofsheim, DE
• Horst Wolf · Albershausen, DE

Key dates

• Filing date: Mar 24, 1980
• Grant date: Feb 9, 1982
• Expiry date: Mar 24, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19079
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

An assembly of fiber-drawing rollers, used for stretching rovings or fiber bundles in a spinning machine, is divided into a plurality of stages each including an elongate driven roller and a set of coacting counterrollers, the driven rollers being rotated at predetermined relative speeds with the aid of several motors including at least one pair of synchronous motors positively coupled with a drawing roller at opposite ends thereof. These synchronous motors are energized with three-phase current of a frequency determined by the setting of a digitally adjustable frequency selector controlling a solid-state frequency inverter. The selector comprises a frequency divider in the output of a preferably also adjustable source of timing signals which may be a pulse generator driven by a motor coupled with another drawing roller.