Image forming apparatus having a stepping motor for rotating a p

Details Image forming apparatus having a stepping motor for rotating a p Image forming apparatus having a stepping motor for rotating a p

1995-05-23

1997-01-07

Grimley, Arthur T.

Electrophotography

Image formation

Photoconductive member

318696, G03G 2100

Patent

active

055922619

ABSTRACT:
An image forming apparatus for developing an electrostatic latent image formed on a photosensitive drum by a toner while rotating the photosensitive drum, transferring the toner image to a paper, and fixing the toner image on the paper. The photosensitive drum is rotated by a stepping motor, and an excitation circuit gradually increases an exciting current of a coil in each phase of the stepping motor to a predetermined value and thereafter gradually decreases. By this control of the exciting current, the stepping motor smoothly rotates without generating minute vibration, so that when the photosensitive drum is rotated by the stepping motor, there is no deleterious influence on an image. Use of the stepping motor enables a reduction in the size and the cost of the image forming apparatus.

REFERENCES:
patent: 4295083 (1981-10-01), Leenhouts
patent: 4477756 (1984-10-01), Moriguchi
patent: 4903067 (1990-02-01), Murayama et al.
patent: 5111242 (1992-05-01), Tanimoto et al.

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