Image forming apparatus with retractable developing unit includi

Details Image forming apparatus with retractable developing unit includi Image forming apparatus with retractable developing unit includi

1993-09-20

1995-11-28

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355259, 355326R, G03G 1506

Patent

active

054712866

ABSTRACT:
A developing unit includes first and second developing rollers for supplying a photosensitive member (drum) with a developer having the same color. A plurality of spacers are provided on the developing unit, so that when the developing unit is advanced such that it is pressed against the photosensitive drum, these spacers contact the photosensitive drum and maintain predetermined spacing or gaps therebetween between the first and second developing rollers and the photosensitive drum. For example, in one embodiment, a spacer is provided at each longitudinal end of each developing roller. In another embodiment, a spacer is provided at a single end of each developing roller as well as at an intermediate position between the developing rollers.

REFERENCES:
patent: 4882605 (1989-11-01), Sakamoto
patent: 5089849 (1992-02-01), Hiraoka
patent: 5300987 (1994-04-01), Aoyama et al.

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