Image forming apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorKazuo Matsumoto
Life of this patent
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Abstract
The present invention provides an image forming apparatus, in which a driving device detected by a detecting device sets the control amount in a manner to set the magnitude of the driving signal supplied to first, second and third motors in accordance with generation of the phenomenon for changing the magnitude of the driving signal imparted to the first, second and third motors. In the image forming apparatus of the particular construction, it is possible to suppress the jitter occurrence in the toner image caused by the fluctuation in the load, the fluctuation bringing about fluctuation in the rotating speed of the photosensitive body.
Claims15
An image forming apparatus, comprising:
- a first motor for rotating a photosensitive member at a predetermined speed;
- a second motor for transferring a transfer medium onto which the toner image formed on the photosensitive member is transferred at a speed equal to the moving speed of the photosensitive member;
- a third motor for supplying the transfer medium toward the photosensitive member at a predetermined speed;
- a driving device supplying driving signals to the first, second and third motors;
- a detecting mechanism for detecting the occurrence of a phenomenon for changing the magnitude of the driving signals supplied from the driving device to the first, second and third motors;
- and
- an input device for changing the magnitude of the driving signals supplied from the driving device to the first, second and third motors on the basis of the occurrence of the phenomenon detected by the detecting mechanism.
An image forming apparatus, comprising:
- a first motor for rotating a photosensitive member at a predetermined speed;
- a second motor for transferring a transfer medium onto which the toner image formed on the photosensitive member is transferred at a speed equal to the moving speed of the photosensitive member;
- a third motor for supplying the transfer medium toward the photosensitive member at a predetermined speed;
- a driving device supplying driving signals to the first, second and third motors;
- a detecting mechanism for detecting the occurrence of a phenomenon for changing the magnitude of the driving signals supplied from the driving device to the first, second and third motors;
- and
- a control amount setting mechanism for setting the magnitude of the driving signals supplied from the driving device to the first, second and third motors on the basis of the occurrence of the phenomenon detected by the detecting means.
A method of setting the image forming conditions of an image forming apparatus, in which the magnitude of the jitter contained in the toner image formed in the image forming apparatus is detected and the image forming conditions are set in a manner to minimize the magnitude of the jitter, comprising the steps of:
- monitoring the fluctuation in the magnitude of the motor current supplied from a motor driving device for driving a first motor to the first motor so as to detect the fluctuation in the rotating speed of the first motor;
- operating a second motor for transferring a transfer medium onto which the toner image formed the photosensitive body is transferred at a speed equal to the moving speed of the photosensitive body and a third motor for supplying the transfer medium toward the photosensitive body at a predetermined speed;
- and
- setting the magnitude and the phase of the motor current supplied to the motor driving device so as to minimize the fluctuation in the rotating speed of the first motor.
Dependencies are inferred from the claim text.