Apparatus for making a yarn

US4334400A · kind A · utility

Inventor

• Ernst Fehrer · Linz, AT

Key dates

• Filing date: Jan 22, 1981
• Grant date: Jun 15, 1982
• Expiry date: Jan 22, 2001

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D02G3/367
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Apparatus for making a yarn comprises two juxtaposed, closely spaced apart suction drums which rotate in the same sense and a delivery duct which protrudes into the triangular space between the suction drums and has an exit adjacent to the suction zones and serves to deliver through said exit singled covering fibers to a drawn roving, which has been delivered by a drawing frame disposed to said triangular space at one end thereof. The yarn thus formed in the triangular space between the suction drums is withdrawn by withdrawing means disposed from said triangular space at the other end thereof. In order to improve the wrapping of the roving with the covering fibers, the surfaces of the suction drums are rough and have a microstructure which will prevent a positive coupling to individual covering fibers and has a peak-to-valley depth up to one-half of the yarn diameter.