Sheet advancement system with phase-adjustable roller arrangemen

Details Sheet advancement system with phase-adjustable roller arrangemen Sheet advancement system with phase-adjustable roller arrangemen

1994-05-03

1995-10-31

Burr, Edgar S.

Typewriting machines

Including control of format and selection of type-face by...

Including means for responding to input program or incoming...

400625, 271114, 271120, B41J 1158

Patent

active

054623731

ABSTRACT:
A sheet advancement system is provided which includes a roller arrangement having first and second rollers coupled to afford selected in-phase and out-of-phase relative rotational orientation thereof. Each roller includes a periphery with gripping and non-gripping surface regions, the gripping surface regions being configured to rotationally engage a sheet and the non-gripping surface regions being configured to clear the sheet. The rollers thus are joined in either a grip orientation wherein substantially continuous roller-directed sheet advancement is accommodated, or a pass orientation wherein the rollers permit unobstructed passage of the sheet. In the grip orientation, the rollers are out of phase, providing substantially continuous gripping region engagement of the sheet. In the pass orientation, the rollers are in phase, allowing for rotational adjustment of the rollers such that the non-gripping regions (or pass regions) of the rollers may be arranged to face the sheet so as to allow the sheet to pass beneath the rollers without roller drag.

REFERENCES:
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patent: 4759649 (1988-07-01), Kelley et al.
patent: 4990011 (1991-02-01), Underwood et al.
patent: 5000594 (1991-03-01), Beehler et al.
patent: 5114134 (1992-05-01), Rasmussen et al.
patent: 5172989 (1992-12-01), Imaseki et al.
patent: 5178378 (1993-01-01), Nakajima
patent: 5188350 (1993-02-01), Hayashi

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