Apparatus for measuring the sliver density at a tapering sliver

Details Apparatus for measuring the sliver density at a tapering sliver Apparatus for measuring the sliver density at a tapering sliver

1994-04-04

1995-10-31

Calvert, John J.

Textiles: fiber preparation

Working

Drafting

19150, D01H 572, D01H 538

Patent

active

054617570

ABSTRACT:
A drafting frame includes a drafting unit for drafting a plurality of slivers running in an advancing direction and combining the slivers into a single sliver; and a sliver guide situated upstream of the drafting unit. The sliver guide has converging walls defining a cavity for guiding therein the plurality of slivers which are gathered by the cavity in a side-by-side orientation in a single plane. A sensor element is supported for displacement relative to the sliver guide. The sensor element has a sliver-contacting face movable toward and away from a counterface forming part of the cavity wall and defining therewith a constriction of the sliver guide. A force urges the sliver-contacting face of the sensor element towards the counterface to compress the slivers running through the constriction. A transducer is coupled to the sensor element for emitting a signal representing excursions of the sensor element in response to thickness fluctuations of the slivers running through the constriction. Further, a pull-off roll pair is situated downstream of the sliver guide and upstream of the drafting unit. The pull-off roll pair which defines a nip between which the slivers pass, pulls the slivers from the sliver guide.

REFERENCES:
patent: 4266324 (1981-05-01), Hasegawa et al.
patent: 4267620 (1981-05-01), Allen, Jr.
patent: 4754527 (1988-07-01), Gilhaus
patent: 4864853 (1989-09-01), Grunder et al.
patent: 4949431 (1990-08-01), Gasser
patent: 5018246 (1991-05-01), Leifeld
patent: 5343598 (1994-09-01), Hauner

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