Textile yarn piecing device with an evaluation arrangement for determining parameters of an automatic yarn piecing process

US6339921B1 · kind B1 · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

• Manfred Lassmann · Nettetal, DE
• Heribert Mertens · Willich, DE

Key dates

• Filing date: Nov 20, 2000
• Grant date: Jan 22, 2002
• Expiry date: Nov 20, 2020

Classification

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

Abstract

A piecing device with an evaluation arrangement for determining parameters of an automatic piecing process at a spinning station (1) of an open-end spinning frame, wherein a control device is provided which, initially in a test phase, controls the creation of at least one test piecing without a supplementary delivery of additional fiber and the subsequent removal of the created test piecing. The evaluation device is designed for determining the length of a thinner extent of the test piecing downstream of the test piecing as viewed in the direction of yarn travel, and for the determination from the detected length of the thinner extent an amount of supplementary delivery of additional fiber required for compensating the thinner extent. A reduction of the draft which is effective during the test phase assures an interference-free checking of the test piecing. The optimization phase for piecings is shortened and leads to a more accurate result when determining the supplementary delivery of additional fiber.