Image forming apparatus and image forming method
AssigneeOki Data Corporation
InventorHirotaka Ohshika
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes: an image carrier; a developer carrier configured to supply developer to the image carrier; a power supply unit configured to apply a voltage to the developer carrier; a drive unit configured to rotationally drive the image carrier and developer carrier; a rotation amount determiner configured to determine the amount of rotation of the image carrier or the developer carrier in a predetermined time period; and a drive control unit configured to instruct the drive unit to rotate the image carrier and the developer carrier in a non-printing state, when it is determined that the rotation amount in a printing operation in the predetermined time period was equal to or greater than a threshold.
Claims20
An image forming apparatus comprising:
- an image carrier;
- a developer carrier configured to supply developer to the image carrier;
- a power supply unit configured to apply a voltage to the developer carrier;
- a drive unit configured to rotationally drive the image carrier and developer carrier;
- a rotation amount determiner configured to determine an amount of rotation of the image carrier in a predetermined time period;
- and
- a drive control unit configured to instruct the drive unit to rotate the image carrier and the developer carrier in a non-printing state, when it is determined that the rotation amount of the image carrier in a printing operation in the predetermined time period was equal to or greater than a threshold.
An image forming apparatus comprising:
- an image carrier;
- a developer carrier configured to supply developer to the image carrier;
- a power supply unit configured to apply a voltage to the developer carrier;
- a drive unit configured to rotationally drive the image carrier and the developer carrier;
- a rotation amount determiner configured to determine an amount of rotation of the image carrier in a predetermined time period;
- and
- a voltage corrector configured to change the voltage to a different voltage for a certain time period in each rotation cycle of the developer carrier, when it is determined that the rotation amount of the image carrier in the predetermined time period was equal to or more than a threshold.
An image forming apparatus comprising:
- an image carrier;
- a developer carrier configured to supply developer to the image carrier;
- a power supply unit configured to apply a voltage to the developer carrier;
- a drive unit configured to rotationally drive the image carrier and developer carrier;
- a rotation amount determiner configured to determine an amount of rotation of one of the image carrier and the developer carrier in a predetermined time period;
- and
- a drive control unit configured to instruct the drive unit to rotate the image carrier and the developer carrier in a non-printing state, when it is determined that the rotation amount in a printing operation in the predetermined time period was equal to or greater than a threshold.
A method of forming an image comprising steps of:
- determining whether an amount of rotation of one of an image carrier and a developer carrier in a printing operation in a predetermined time period is equal to or greater than a threshold,
- rotating the image carrier and the developer carrier in a non-printing state, when it is determined that the rotation amount in the printing operation in the predetermined time period was equal to or greater than the threshold.
A method of forming an image comprising steps of:
- determining whether an amount of rotation of one of an image carrier and a developer carrier in a predetermined time period is equal to or greater than a threshold,
- switching a voltage applied to the developer carrier while the developer carrier rotates from a first voltage to a second voltage for a certain time period in each rotation cycle of the developer carrier, when it is determined that the rotation amount in the predetermined time period was equal to or more than the threshold.
Dependencies are inferred from the claim text.