Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1992-06-24
1995-06-13
Hartary, Joseph W.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347232, 347248, 358412, 318 85, G01D 942, G01D 1506, H02P 546
Patent
active
054247632
ABSTRACT:
In a color image forming apparatus such as a color laser printer, misregistration of colors of an output image along a subscanning direction is minimized so as to prevent accumulation of color misregistrations in the output image. In the apparatus, a photosensitive drum motor and a transfer drum motor are driven by motors exclusively provided thereto. The apparatus includes a photosensitive drum motor controller and a transfer drum motor controller respectively provided for speed-controlling the photosensitive drum motor and the transfer drum motor. By these motor controllers, a phase difference between a frequency generator signal from the motor and a phase reference signal is checked. Even if the phase difference exceeds a predetermined range of phase, the motor controller controls the motor so that the phase difference quickly falls within the predetermined range of phase.
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Egawa Jiro
Izawa Hirokazu
Komiya Kenichi
Okada Kyoichi
Gibson Randy W.
Hartary Joseph W.
Kabushiki Kaisha Toshiba
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