Screw extruder with feed roller

Details Screw extruder with feed roller Screw extruder with feed roller

1993-04-12

1993-12-07

Hornsby, Harvey C.

Agitating

Rubber or heavy plastic working

With specified feed means

366309, 1525651, B28C 704

Patent

active

052677877

ABSTRACT:
A screw extruder has a feed roller which is parallel to and spaced laterally from the screw, a hopper feeds the material to be extruded to the screw and feed roller and to the space between them. A knife scrapes material from the feed roller to keep it clear. In one embodiment, the knife is pivotally supported by a knife holder disposed below the feed roller and is pulled against the feed roller by a spring-loaded link which is pivotally attached to a median portion of the blade. In another embodiment, the knife is a flexible spring blade. A protuberance on a knife-holding plate limits flexing of the blade by pressure of material in the space between the screw and the feed roller. In a further embodiment, a photo-cell scans a rear side of the feed roller and controls a servo-motor for drawing the knife against the feed roller.

REFERENCES:
patent: 2477339 (1949-07-01), Ljungquist
patent: 3596635 (1971-08-01), Smitzer
patent: 3847480 (1974-11-01), Fisher
patent: 3848993 (1974-11-01), Hasiotis
patent: 4141112 (1979-02-01), Klemz
patent: 4498760 (1985-02-01), Sugiyama
patent: 4561766 (1985-12-01), Fox
patent: 5081504 (1992-01-01), Morisawa

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