Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYousuke Hata
Life of this patent
Estimating the term…
Abstract
The image forming apparatus includes photosensitive drums, drive motors for driving the photosensitive drums, a motor control unit for controlling operations of the drive motors, and a printer control unit. The printer control unit stops rotations of the photosensitive drums at reference positions after a print job is finished. After prescribed time elapses from the end of the print job, microscale driving of the photosensitive drums is performed for a microscale driving time period. Then, drive amounts by the drive motors during the microscale driving are calculated. At the start of a next print job, activation timing of each of the drive motors is adjusted in accordance with the drive amount so as to reduce a variation generated due to the microscale driving.
Claims11
An image forming apparatus for forming a color image, comprising:
- a first photosensitive member and a second photosensitive member;
- a first motor and a second motor configured to rotate the first photosensitive member and the second photosensitive member, respectively;
- a detection section configured to detect rotation phases of the first photosensitive member and the second photosensitive member;
- a stop processing section configured to control the first motor and the second motor to stop the first photosensitive member and the second photosensitive member such that the rotation phase of the first photosensitive member and the rotation phase of the second photosensitive member have predetermined relations based on the detected rotation phases of the first photosensitive member and the second photosensitive member, after the end of image formation;
- a control section configured to control the first motor and the second motor without an image formation instruction to rotate the first photosensitive member and the second photosensitive member, respectively, after the stop processing by the stop processing section;
- a calculation unit configured to calculate a first rotation amount of the first photosensitive member and a second rotation amount of the second photosensitive member after the stop processing by the stop processing section;
- and
- a startup control section configured to control the first motor and the second motor to perform a startup process of the first photosensitive member and a startup process of the second photosensitive member based on the first rotation amount and the second rotation amount.
Dependencies are inferred from the claim text.