Method and apparatus for controlling the sliver-thickness variat

Details Method and apparatus for controlling the sliver-thickness variat Method and apparatus for controlling the sliver-thickness variat

1976-09-03

1978-07-11

Gill, James J.

Textiles: fiber preparation

Working

Drafting

318599, D01H 538

Patent

active

040992977

ABSTRACT:
A method and apparatus for controlling the sliver thickness variation in a carding machine. The thickness variation of the sliver delivered from the carding machine is measured and an electrical signal corresponding to the thickness variation of the carded sliver is issued. A difference signal is created by comparing the above-mentioned electric signal, and a control pulse signal in accordance with the difference signal is intermittently created at predetermined time intervals, each of said time intervals being shorter than a time required for a length of the carded sliver which length corresponds to a long term variation of the carded slivers thickness. The supply amount of fiber tufts to the carding machine is intermittently adjusted for reducing the above-mentioned control signal toward zero by said control pulse signal at each of said time intervals.

REFERENCES:
patent: 2921247 (1960-01-01), Morrison
patent: 3487458 (1969-12-01), Martens et al.
patent: 3523228 (1970-08-01), Currie et al.
patent: 3612975 (1971-10-01), Keefe
patent: 3938223 (1976-02-01), Grice

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