Method of levelling out variations of a fibre sliver and apparat

Details Method of levelling out variations of a fibre sliver and apparat Method of levelling out variations of a fibre sliver and apparat

1981-03-16

1983-01-25

Rimrodt, Louis

Textiles: fiber preparation

Working

Drafting

73160, D01H 532, D01H 538

Patent

active

043695507

ABSTRACT:
An autolevelling drawframe for levelling out staple fibre slivers in the spinning mill operation, in which deviations of the sliver weight (linear density) from the preset desired value detected are processed into correcting signals and are transmitted to a correcting member, which adapts the input speed of the drafting arrangement. The correcting signal transmitted is generated from the product of a voltage proportional to the rotational speed of the main motor and a voltage determined by the deviation in linear density. The apparatus consists of a computer (34,41; 60,41; 67,71) for computing the correcting signal, which computer is connected electrically with the correcting member (48), with a transducer (20) transmitting the voltage proportional to the rotational speed of the main motor, and with means for generating the voltage determined by the deviation in linear density. The computer can consist of a control device (36) and a multiplicator (41) or of a microprocessor (71) (digital computer).

REFERENCES:
patent: 3822590 (1974-07-01), Tharpe
patent: 3938223 (1976-02-01), Grice
patent: 4137487 (1979-01-01), Niestroj et al.
patent: 4184361 (1980-01-01), Erben
patent: 4199843 (1980-04-01), Leifeld
patent: 4199844 (1980-04-01), Goetzinger
patent: 4266324 (1981-05-01), Hasegawa et al.
patent: 4267620 (1981-05-01), Allen
patent: 4302968 (1981-12-01), Moser

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