EP 0275471 B1 19910424 - METHOD AND APPLIANCE FOR THE EQUALIZATION OF THE FIBRE WEB DENSITY AT THE ENTRANCE OF A TEXTILE MACHINE
Title (en)
METHOD AND APPLIANCE FOR THE EQUALIZATION OF THE FIBRE WEB DENSITY AT THE ENTRANCE OF A TEXTILE MACHINE
Publication
Application
Priority
CH 495086 A 19861212
Abstract (en)
[origin: US4860406A] 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.
IPC 1-7
IPC 8 full level
D01G 15/36 (2006.01); D01G 23/06 (2006.01)
CPC (source: EP US)
D01G 23/06 (2013.01 - EP US)
Citation (examination)
- DE 3425345 A1 19860130 - TRUETZSCHLER & CO [DE]
- DE 2912576 A1 19791031 - ZELLWEGER USTER AG
- FR 2322943 A1 19770401 - ALSACIENNE CONSTR MECA [FR]
- US 4275483 A 19810630 - ROBERSON JAMES H
- Baumann,E.:Sensortechnik für Kraft und Drehmomemt, 1983, VEB Verlag Technik, Berlin, Seiten 39-41
- Tichy J., und Gautschi : Piezoelektrische messtechnik,1980, Springer-Verlag Berlin, Heidelberg, New York, Seite 147
- Einführung in die piezoelektrische Messtechnik : VALVO GmbH, Hamburg, Burchardstr.19, Seien 46-53
Designated contracting state (EPC)
CH DE GB IT LI
DOCDB simple family (publication)
EP 0275471 A1 19880727; EP 0275471 B1 19910424; DE 3769625 D1 19910529; IN 170276 B 19920307; JP S63309622 A 19881216; US 4860406 A 19890829; US 4955266 A 19900911
DOCDB simple family (application)
EP 87118415 A 19871211; DE 3769625 T 19871211; IN 740MA1987 A 19871015; JP 31240287 A 19871211; US 13220487 A 19871210; US 25630288 A 19881011