| US 7,603,065 B2 | ||
| Image forming apparatus, cartridge, storage device and developer supplying method | ||
| Seiji Yamaguchi, Mishima (Japan); and Issei Imamura, Numazu (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on May 11, 2006, as Appl. No. 11/431,967. | ||
| Claims priority of application No. 2005-146448 (JP), filed on May 19, 2005; and application No. 2005-146476 (JP), filed on May 19, 2005. | ||
| Prior Publication US 2006/0263106 A1, Nov. 23, 2006 | ||
| Int. Cl. G03G 15/08 (2006.01) | ||
| U.S. Cl. 399—258 [399/255] | 8 Claims |
| 1. An image forming apparatus comprising:
a developing apparatus configured to form a developer image;
a supply apparatus configured to supply developer to the developing apparatus;
a detector configured to detect an amount of developer consumed during an image forming process; and
a controller configured to perform an addition calculation for the amount of developer consumed, and for employing a value
obtained by the addition calculation and a supply threshold value to determine whether developer should be supplied to the
developing apparatus,
wherein the controller sets the supply threshold value in accordance with an operating state of the developing apparatus and
a remaining life of the developing apparatus.
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