| US 7,519,316 B2 | ||
| Image forming apparatus and method for forming image | ||
| Shuitsu Sato, Tokyo (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 23, 2006, as Appl. No. 11/473,547. | ||
| Prior Publication US 2007/0297832 A1, Dec. 27, 2007 | ||
| Int. Cl. G03G 15/08 (2006.01) | ||
| U.S. Cl. 399—254 [399/255; 399/256] | 9 Claims |
| 1. An image forming apparatus comprising:
a developing unit that is provided around an image bearing body, and includes a container to contain a developer, a mixer
to agitate and to charge the developer in the developing unit, a mechanism to vary a driving force of the mixer, and a developer
bearing member to supply the charged developer to an electrostatic latent image formed on the image bearing body;
a transfer unit to transfer a developer image developed by the developing unit onto a recording member;
a fixing unit to fix the transferred developer image on the recording member;
a counter to count a number of times of image formation; and
a control unit to change the driving force of the mixer according to information of the number of times of image formation
from the counter,
wherein the change of the driving force according to the number of times of image formation is previously determined based
on a flow rate change characteristic of the developer.
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