Method of controlling fiber-drawing apparatus

Details Method of controlling fiber-drawing apparatus Method of controlling fiber-drawing apparatus

1984-04-13

1985-04-23

Rimrodt, Louis K.

Textiles: fiber preparation

Working

Drafting

19240, 19293, 19300, 364470, D01H 542

Patent

active

045120617

ABSTRACT:
A draw frame of a sliver-drafting apparatus has three cascaded roller pairs whose lower rollers are driven by respective motors at speeds determined by associated frequency dividers and/or multipliers in the output of a common oscillator of adjustable operating frequency. The slivers drafted by the roller pairs form, after doubling or plying, a fiber bundle traversing a thickness sensor whose output, integrated over predetermined time periods, is used by a microcomputer to ascertain optimum nip-line spacings and contact pressures reducing the thickness variations to a minimum. These parameters can be varied by horizontal slides supporting the roller pairs and spring-loaded blocks acting upon the shafts of the upper rollers; the positions of the slides and the pressures of the loading springs are adjustable by servomotors, under the control of the microcomputer, on the basis of a running-in program in which different combinations of values for the spacings and the pressures are successively set up and the combinations yielding the highest degree of uniformity are subsequently re-established.

REFERENCES:
patent: 4199844 (1980-04-01), Goetzinger

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