Self-centering pressure roller for sheet feeding mechanism

Details Self-centering pressure roller for sheet feeding mechanism Self-centering pressure roller for sheet feeding mechanism

1978-03-30

1979-12-18

Burr, Edgar S.

Typewriting machines

Sheet or web

Including friction-feed means

B41J 1302

Patent

active

041792246

ABSTRACT:
A self-centering pressure roller for a high speed paper feed mechanism. The assembly includes two rollers each having an undercut central portion disposed for rotation on parallel axles. The roller axles are supported on a bracket movable in four degrees of freedom. The rollers are urged toward a platen to provide pressure on a paper sheet or web disposed between the rollers and the platen. The geometry of the roller assembly and the platen is chosen so that the reaction force caused by roller contact with the paper sheet or web causes the downstream pressure roller to exert more force on the sheet or web than the other roller thereby preventing bunching of paper between the rollers. The pressure roller assembly is self-aligning thereby preventing skew of paper fed through the assembly in either direction. The assembly can be easily manufactured without special alignment and is adaptable to accommodate many different paper widths.

REFERENCES:
patent: 3421612 (1969-01-01), Pitt

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