US 5,400,582 A · Textile machine with a drafting arrangement

Abstract

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.

Claims12

Dependent claims

A spinning machine comprising

a plurality of spinning units arranged in at least one row extending along the machine;
a drafting arrangement for supplying fiber strands to said spinning units, said arrangement including at least one driven cylinder and at least one top roll for directing a fiber strand therebetween to a respective spinning unit;
and
a brushless D.C. drive motor having an output shaft connected to said cylinder for driving said cylinder and a position pick-up for indicating an angular position of said output shaft and said cylinder, said motor having a rated load sufficient to drive said cylinder under normal operation and being operable to accelerate said cylinder from standstill under overload conditions for a period longer than a starting-up phase of the spinning machine.

1 more element

Dependencies are inferred from the claim text.

Textile machine with a drafting arrangement

Life of this patent

Textile machine with a drafting arrangement

Life of this patent

Abstract

Claims12