Apparatus for detecting the density or thickness and variations

Details Apparatus for detecting the density or thickness and variations Apparatus for detecting the density or thickness and variations

1988-10-11

1990-09-11

Schroeder, Werner H.

Textiles: fiber preparation

Working

Carding

19 23, 19 98, 19240, D01G 1536

Patent

active

049552660

ABSTRACT:
A fiber infeed device supplies fiber material to a textile machine, such as a card, and comprises a driven rotatable feed roll and feed plate. This feed roll is, however, spatially fixed, whereas the feed plate is pivotable but physically immobile during detection of the thickness and thickness variations of the infed fiber material. The feed plate can be pivoted into an operating position against a stop during throughpass of the fiber material. A substantially invariable size nipping zone is thus formed between the driven rotatable feed roll and the stationary feed plate in which a property of the throughpassing fiber material representative of its instantaneous thickness and thus variations thereof can be detected. By positionally fixing the feed plate, for instance, different forces are applied thereto in the nipping zone where the fiber material is compacted. The arising variable forces enable ascertaining thickness variations of the infed fiber material. A further aspect contemplates deriving from the variable forces control signals delivered to a control device for comparison with a predeterminate reference value signal to produce output signals for controlling the rotational speed of the feed roll and thus compensating thickness variations of the infed fiber material.

REFERENCES:
patent: 4275483 (1981-06-01), Roberson
patent: 4776065 (1988-10-01), Rake
patent: 4779310 (1988-10-01), Leifeld

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