Transmission device for photosensitive drum

摘要

A transmission device for a photosensitive drum includes a sleeve, a transmission unit disposed in the sleeve and capable of moving and rotating at the same time, an elastic member, and a shell receiving the sleeve and the elastic member so that a relatively larger radius section and a relatively smaller radius section of the elastic member exert elastic force on the sleeve and the transmission unit, respectively. The transmission unit has two engagement blocks and a receiving space between them. Each engagement block has an inclined outer surface, an inner surface, an inclined top surface and an engagement concave connecting the inner and outer surfaces. The engagement concaves are opened toward opposite directions for engagement with two pillars of a drive member of an electronic image forming apparatus respectively. As a result, the transmission device can be connected with and separated from the drive member smoothly.

主权项

1. A transmission device (10) for a photosensitive drum, which is adapted for engagement with a drive member (90) of an electronic image forming apparatus provided with two pillars (92), said transmission device comprising:
a transmission unit (20) comprising a shaft (70) and an engagement structure (80), the shaft (70) extending along an imaginary axis (L) and being provided with a first end (71) facing toward a first direction (D1), a second end (72) facing toward a second direction (D2) opposite to the first direction (D1), and at least a protrusion (75) extending along a radial direction of the shaft (70), the engagement structure (80) being provided with a base (81) attached to the first end (71) of the shaft (70), two engagement blocks (82) extending from two opposite sides of the base (81) away from the imaginary axis (L) and toward the first direction (D1), and a receiving space (86) located between the engagement blocks (82) for receiving the drive member (90), each said engagement block (82) having an outer surface (825) extending towards the imaginary axis (L) toward the first direction (D1), an inner surface (824) facing the receiving space (86), an inclined top surface (822) at a junction between the outer surface (825) and the inner surface (824), an engagement concave (823) at another junction between the outer surface (825) and the inner surface (824), and a vertex (821) located between the inclined top surface (822) and the engagement concave (823), wherein an included angle between an extending direction of the inclined top surface (822) and the imaginary axis (L) is not equal to 90 degrees, and the engagement concaves (823) of the engagement blocks (82) are opened toward opposite directions for allowing the pillars (92) of the drive member (90) to enter the engagement concaves (823) through openings of the engagement concaves (823); a sleeve (30) having a main body (32), an axial hole (322) penetrating the main body (32) along the imaginary axis (L), and at least a through groove (324) located at the main body (32), communicated with the axial hole (322) and inclined relative to the imaginary axis (L), the shaft (70) of the transmission unit (20) being disposed in the axial hole (322) and capable of rotating and moving axially, the through groove (324) and the inclined top surfaces (822) of the engagement blocks (82) of the transmission unit (20) extending toward the first direction (D1) aslope along the same rotation direction, the protrusion (75) of the shaft (70) being inserted into the through groove (324) movably; a shell (60) having a pipe (66) for mounted to an end of the photosensitive drum, a top wall (64) located at a side of the pipe (66), a bottom wall (65) located at another side of the pipe (66), and a receiving hole (61) extending along the imaginary axis (L) and opened on the top wall (64) for receiving the main body (32) of the sleeve (30) so that the sleeve (30) is coupled with the shell (60) unrotatably and movably along the imaginary axis (L); and an elastic member (50) having a larger radius section (51) and a smaller radius section (52) connected with the larger radius section, the larger radius section (51) being disposed in the receiving hole (61) of the shell (60) and having two ends abutted against the bottom wall (65) of the shell (60) and the sleeve (30) respectively, the smaller radius section (52) being disposed in the axial hole (322) of the sleeve (30) and having an end abutted against the second end (72) of the shaft (70) of the transmission unit (20).