US 7,321,740 B2 | ||
Developing cartridge and electrophotographic image forming apparatus employing the same | ||
Sam-Seok Choi, Suwon-si (Korea, Republic of); and Dong-Hoon Park, Osan-si (Korea, Republic of) | ||
Assigned to Samsung Electronics Co., Suwon-si, Gyeonggi-do (Korea, Republic of) | ||
Filed on Oct. 04, 2005, as Appl. No. 11/242,080. | ||
Claims priority of application No. 10-2005-0005401 (KR), filed on Jan. 20, 2005. | ||
Prior Publication US 2006/0159487 A1, Jul. 20, 2006 | ||
Int. Cl. G03G 21/18 (2006.01) |
U.S. Cl. 399—113 | 16 Claims |
1. An image forming apparatus comprising:
a photosensitive drum, on which an electrostatic latent image is formed;
at least one developing cartridge including a developing roller which develops a toner image by supplying a developer to the
electrostatic latent image; and
a transfer unit which transfers the toner images onto a print medium,
wherein the at least one developing cartridge comprises:
a first frame on which the photosensitive drum is arranged;
a second frame which is pivotably coupled to the first frame and coupled to the developing roller;
a first elastic element which provides an elastic force biasing the second frame in the direction towards the first frame;
and
gap maintaining elements which limit the pivoting of the second frame so that a developing gap is maintained, and
the developing roller and the gap maintaining elements are arranged on the second frame to move in a direction opposite to
a pivoting direction of the second frame.
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