Rieter Machine Works, Ltd.

Stefan Huppi

Urs B Meyer

Werner Hartmeier

Walter Slavik

Giorgio Citterio

In a textile machine with a drafting arrangement and textile spindles, the spindles are driven by an electric main drive. The drafting arrangement cylinders are coupled so that their speed is a given proportion of the speed of the main drive. The coupling is via a position-controlled brushless D.C. motor with electronic commutation for driving the drafting arrangement. An additional flywheel mass on the drafting arrangement drive is dimensioned so that the slowing-down time of the drafting arrangement is of the same order as the slowing-down time of the main drive, resulting in controlled slowing-down conditions if the voltage suddenly fails. The drafting arrangement motor can be made much smaller than hitherto. Also, the starting and slowing-down conditions can be accurately and sensitively controlled, thus reducing the risk of thread breakages.

Textile machine with a drafting arrangement including rotational

Textile machine with a drafting arrangement

The control system uses a digital position controller for controlling the movement of a yarn end for re-piecing, for example in a rotor spinning machine. The control system is distance-dependent such that the position of the yarn end at a given time provides a control for the speed of the yarn end back to the target position.

System for controlling the movement of an elongated textile structure

Identical robots are disposed on a common track along a textile machine having a plurality of spinning stations. The robots are controlled by a central control unit so as to be allocated to a respective sub-section of the track with each sub-section comprising the same number of faults which require clearing. The allocation of the robots to the respective sub-sections is performed periodically so as to optimize the operation of each robot for fault clearing purposes.

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Baar, Switzerland

Stefan Huppi