Transfer roller controlled to position the paper in registration

Details Transfer roller controlled to position the paper in registration Transfer roller controlled to position the paper in registration

1994-04-21

1996-02-13

Ramirez, Nestor R.

Photocopying

Contact printing

Light boxes

355317, G03G 1514

Patent

active

054915430

ABSTRACT:
An image forming apparatus includes a photosensitive drum. A transfer roller is arranged in a manner that a periphery of the transfer roller is brought close to a peripheral surface of the photosensitive drum, and a PE sensor is arranged in front of the transfer roller, and paper leading end sensor is arranged in back of the transfer roller. When a paper supplied from a paper hopper is detected by the PE sensor, the photosensitive drum and the transfer roller are rotated, and therefore, the paper is fed until a leading end thereof is detected by the leading end sensor. The photosensitive drum and the transfer roller are independently driven by a main motor and a transfer motor, respectively. A printing operation is started in response to a print command, the paper is further fed by the photosensitive drum and the transfer roller, and then, when the leading end sensor does not detect the paper, the photosensitive drum and the transfer roller are stopped.

REFERENCES:
patent: 3751156 (1973-08-01), Szostak et al.
patent: 4302093 (1981-11-01), Landa
patent: 5318631 (1994-06-01), Tsukamoto

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