Textiles: fiber preparation – Working – Drafting
Patent
1975-01-06
1976-02-17
Gilu, James J.
Textiles: fiber preparation
Working
Drafting
73 32R, 73160, D01H 538
Patent
active
039382230
ABSTRACT:
An apparatus for maintaining sliver thickness uniform whereby the web from a carding machine is gathered by a trumpet and passed between a grooved driven roller and a sensor roller riding in the groove so that the movements of the sensor roller vary as a function of sliver density. The sensor roller is mechanically connected to a magnetic core so that movement of the sensor roller varies the coupling between a primary transformer winding and a pair of secondary windings. The voltages induced in the secondary windings are applied, after a delay, to a first differential amplifier whose output in turn is connected to a second differential amplifier which is periodically rendered operative by a pulse generator and to which is also connected a potentiometer for adjusting desired density. The output of the second amplifier is connected to a pair of relay coils, one responsive to positive excursions and the other to negative. Each relay controls a switch connecting a power source to a motor coil for rotating the motor which in turn controls a variable speed drive for controlling, for example, the feed roll of a conventional card.
REFERENCES:
patent: 3363459 (1968-01-01), Brown
patent: 3827106 (1974-08-01), Varga
patent: 3862473 (1975-01-01), Felix et al.
Fiber Controls Corporation
Gilu James J.
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