Image forming apparatus

Details Image forming apparatus Image forming apparatus

1997-12-30

2000-05-02

Le, N.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

347 55, 347115, B41J 241, B41J 206, B41J 2385

Patent

active

060578688

ABSTRACT:
A motor drives four final gears provided to four image recording units via a driving belt. Each of the image recording units corresponds to one of yellow, magenta, cyan and black. Each final gear is connected to a rotation axis of a toner feed roller via an electromagnetic clutch. If a black-and-white image is to be formed, only the electromagnetic clutch associated with the black image recording unit is connected, while the rest of the electromagnetic clutches are kept disconnected so that unnecessary image recording units are not driven. This arrangement improves the image quality and durability of the apparatus, and achieves a reliable color printing operation.

REFERENCES:
patent: 5353050 (1994-10-01), Kagayama
patent: 5552814 (1996-09-01), Maeda et al.
patent: 5815775 (1998-09-01), Miyasaka et al.

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