Apparatus for detecting the density or thickness and variations thereof of fiber material at the infeed of a textile machine as well as for evening the density of thickness variations of fiber material at the infeed of a textile machine
US4955266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1988 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01G23/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.