Image forming apparatus and method

Details Image forming apparatus and method Image forming apparatus and method

2008-03-12

2011-12-06

Duda, Rina (Department: 2837)

Electricity: motive power systems

Open-loop stepping motor control systems

C318S685000

Reexamination Certificate

active

08072178

ABSTRACT:
An image forming apparatus including a stepper motor, a component attached to the stepper motor, and a controller to control the stepper motor. The controller controls the stepper motor to be accelerated or decelerated, at driving frequencies that do not match a resonant frequency, in order to avoid a resonance between the stepper motor and the component, by selecting a speed control table that has the driving frequencies, which avoid the resonance. Thus, the image forming apparatus can avoid the resonance between the stepper motor and the component, minimize vibration and noise, and prevent malfunctions of the component. The image forming apparatus further comprises a first storage unit to store a resonant frequency of the component and, a second storage unit to store speed control tables having different driving frequencies, which are set according to speed control periods.

REFERENCES:
patent: 4988938 (1991-01-01), Ito et al.
patent: 5927398 (1999-07-01), Maciulewicz
patent: 6750627 (2004-06-01), Holdaway
patent: 2002/0008490 (2002-01-01), Holdaway
patent: 10-098898 (1998-04-01), None
patent: 2000-34873 (2000-06-01), None

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