| 摘要 |
A transmission device for a photosensitive drum includes a sleeve having at least one guiding groove, a transmission unit having a shaft disposed in the sleeve and capable of moving and rotating at the same time, an elastic member, and a gear member receiving the sleeve and the elastic member so that the elastic member exerts elastic force on the shaft of the transmission unit. The transmission unit has two L-shaped engagement blocks defining a receiving space therebetween. Each L-shaped engagement block has an inclined outer surface, an inner surface, an inclined top surface and an engagement concave connecting the inner and outer surfaces are is rotatably secured to a base. The engagement concaves are opened toward opposite directions for engagement with two pillars of a drive member of an electronic image forming apparatus. Accordingly, the transmission device can be connected with and separated from the drive member smoothly. |
| 主权项 |
1. A transmission device for a photosensitive drum, which is adapted for engagement with a drive member of an electronic image forming apparatus provided with two pillars, the transmission device comprising:
(a) a transmission unit comprising:
a shaft extending along an imaginary axis and having a first end facing toward a first direction, a second end facing toward a second direction opposite to the first direction, and at least one protrusion extending along a radial direction of the shaft; andan engagement structure comprising:
a base extending from the first end of the shaft;a notched receptacle defined in the base;two L-shaped engagement blocks, each L-shaped engagement block having a bottom member and an engagement claw, the bottom member having a first end portion defining a hook and an opposite, second end portion, and the engagement claw extending vertically from the second end portion of the bottom member, wherein the two L-shaped engagement blocks are pivotally received in two opposite sides of the notched receptacle, respectively, such that each L-shaped engagement block is rotatable around a pivotal axis at the second end portion of the bottom member, the pivotal axis being perpendicular to the imaginary axis, the first end portion of the bottom member is toward the imaginary axis and the engagement claw is helically toward the first direction in a normal state, and wherein the two L-shaped engagement blocks defines a receiving space therebetween for receiving the drive member; anda holding member engaged with the hook of the bottom member of each L-shaped engagement block; (b) a sleeve having a main body, an axial hole defined through the main body along the imaginary axis, and at least one guiding groove formed on the main body and communicated with the axial hole, the shaft of the transmission unit being disposed in the axial hole and capable of rotating and moving axially, and the at least one protrusion of the shaft being movably retained in the at least one guiding groove; (c) a gear member for engaging with the photosensitive drum, having a housing defined along the imaginary axis for receiving the main body of the sleeve so that the sleeve is coupled with the gear member unrotatably around the imaginary axis; and (d) an elastic member being disposed in the axial hole of the sleeve and having two ends abutted against a bottom wall of the gear member and the second end of the shaft of the transmission unit, respectively. |
