Method for detecting the density or thickness and variations the

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

1987-12-10

1989-08-29

Schroeder, Werner H.

Textiles: fiber preparation

Working

Carding

19240, D01G 1536, D01G 1540

Patent

active

048604062

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 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: 4001916 (1977-01-01), Grimshaw
patent: 4271565 (1981-06-01), Grunder
patent: 4275483 (1981-06-01), Roberson
patent: 4438548 (1984-03-01), Grunder

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