GB888786A - Improvements relating to the crimping of artificial filaments by the compression process - Google Patents

Abstract

888,786. Crimping fibres. BARMER MASCHINENFABRIK A.G. April 28, 1960 [April 30, 1959], No. 14979/60. Class 120(3) In apparatus for compressively crimping artificial filaments by supplying the filament to the crimping chamber at constant speed and regulating the withdrawal of crimped filaments therefrom in dependence on the chamber filling or vice versa, supply or withdrawal is effected alternately at one and then the other of two specific and slightly different speeds which span the necessary mean winding speed. A changeover device, actuated by fluctuations in the volume of filamentary material in the chamber, initiates the speed alternation by mechanical, electrical or electromechanical, or hydraulic adjustment means, e.g. a friction disc or eddy current coupling or a regulating circuit, which permits or causes a motor shaft to rotate at one of two slightly different speeds or changes the motor speed, e.g. by connecting the motor to two different voltages or frequencies. As shown, a filament 1 is fed by constant speed rollers 2 and 3 into a chamber 5 wherein it is heated and then cooled as it is compressed into superposed convolutions to form a plug 7 against the resistance of an assembly of balls 6 through which the crimped material is withdrawn, past a feeler pin 15, and wound into a package 27 by a roller 17. Variation in the level of plug 7 causes movement of a scanning and setting member 8 (through an arm 9 adjustably positioned by a displaceable carrier 10) which, at a predetermined position, actuates and releases a micro-switch 13 to energize and de-energize the coil 32 of a magnetic change-over switch 31 which thereby connects a three-phase supply R<SP>1</SP>S<SP>1</SP>T<SP>1</SP> or RST at a frequency of 31 or 28 cycles per second to a motor 22 which thus drives roller 17 at corrective speed. A feeler plate 16 of the member 8 may be hollow and/or drilled for the passage of crimped filament therethrough. In another modification, the switch 13 is mounted directly on the rim of the chamber and the pushbutton therefor is formed as a feeler pin. The supply frequencies may be predetermined by adjustment of gearing between component units of a motor-generator set and multiple crimping units may operate from common, multiphase, alternate supplies, Fig. 3 (not shown).