Spinning frame having multi-stage condensation draft unit

Abstract

The frame is equipped with a suction device 25 equipped with a perforation range 35 on a pair of exit rollers of a multi step drafting machine 13, and the suction device 25 provides a guiding plane for sliver to form a condensing step, set to form compact fiber strands by condensing the slivers in the condensing step, and a revolution changing device 52d is equipped on a drafting device 13 or a driving mechanism for drafting device, and revolutions of the individual roller pairs 29 become free from each other in relation to time that induces the compact fiber strands 22, 22' to receive a variable draft in time.

Description

technical field

[0001] The invention relates to a spinning frame, especially a ring spinning frame with a multi-stage drafting unit, a pair of outlet rollers has a suction device, especially a suction roller, and the suction device has a Perforated area all over the circumference, which (suction roller), especially between the corresponding drafting unit outlet roller and the suction roller, forms a twist test gap, so that a twist test corresponding roller, along a path in Its circumference creates a guiding surface for separating here two parts of a tow or two tows supplied next to each other in order to form a coagulation stage in which the final drawing is already involved but still without twisting The fiber bundles are condensed and / or bundled into compact fiber bundles. Furthermore, the invention relates to the production of spun ply yarns. Background technique

[0002] With previously known spinning frames of this type (cf. DE 19500036, DE 196 08697), each compact f...

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