Ring spinning frame comprising drawing systems

Abstract

The invention relates to a ring spinning frame comprising drawing systems that are provided with several drawing rollers which can be driven at speeds causing predetermined drawings by means of main drawing system drive units. Auxiliary drawing roller drive units are assigned to the drawing rollers at a distance from the main drawing system drive unit.; The inventive ring spinning frame is characterized in that drawing rollers (2, 3, 4) are equipped with several auxiliary drawing roller drive units (12) which are distributed along the length of the drawing system (1) and impinge the drawing roller with torque that at least reduces torsion thereof such that torques preventing or at least reducing torsion of drawing rollers can be introduced also between the ends of very long drawing rollers without increasing the division of the ring spinning frame at said points or interrupting the sequence thereof and without having to use synchronous motors.

Description

technical field

[0001] The invention relates to a ring spinning machine with a drafting mechanism with a plurality of drafting rollers.

[0002] On very long drafting mechanisms with, for example, five hundred and more working positions, the problem arises that the drafting rollers of the drafting mechanism perform different degree of twisting. From what length this problem occurs depends on different factors such as roll diameter, bearing friction, lag due to stretched aprons, etc. During operation of the drafting mechanism, this different twist has no adverse effect. However, this leads to drafting defects during acceleration or deceleration of the drafting mechanism, for example during start-up and coast-down, wherein this differential twist increases or decreases during start-up and coast-down. Depending on whether the twisting of the drafting rollers is forward or backward with respect to the upstream or downstream drafting rollers, this can lead to thin or thick place...

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