ROTATIONAL FORCE TRANSMISSION STRUCTURE

Abstract: a cartridge unit detachable from a main body of an image forming device includes: a rotation member; a driven coupler arranged at one end portion of the rotation member in an axial direction of the rotation member; and a coil spring arranged to be expandable and compressible in the axial direction, a first end portion of the coil spring being fixed onto the driven coupler, and the coil spring being wound in a first direction from the first end portion toward a second end portion. when a rotational force is transmitted to the second end portion of the coil spring in the first direction or in a second direction opposite to the first direction, a portion of the transmitted rotational force is converted into a force that decreases or increases a diameter of the coil spring, and the first end portion of the coil spring presses the driven coupler in a direction perpendicular to the axial direction.

Inventor(s): Seungchan Park, Junhui Kim, Youngkwang Shin

CPC Classification: G03G21/1647 (Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements)

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