Driving force transmission mechanism for image forming apparatus and processing cartridge

摘要

The present invention provides a driving force transmission mechanism for an image forming apparatus and a process cartridge. The transmission mechanism includes a photosensitive drum driving component (10) and an image forming apparatus driving head (20). The driving component (10) includes a drum shaft (3) which axially projects from an end of a photosensitive drum (1) and a boss (4) which axially projects from an end surface of the drum shaft (3). A tooth (5a) is obliquely arranged on a side wall (4b) of the boss and projects in a radial direction. The driving head (20) includes a recess (11) with a twisted-surface and matching with the boss (4), the recess has a polygonal cross section with a twisted corner section. The process cartridge includes the driving component. The photosensitive drum driving component is easy to manufacture and is not easy to be damaged when using for a long time.

主权项

1. A photosensitive drum driving component (10), for receiving driving force from an image forming apparatus driving head (20) including a recess (11) with three twisted-surfaces (12), each of the twisted-surfaces (12) having an edge (16), the photosensitive drum driving component (10) including:
a drum gear (2) provided at an end of a photosensitive drum (1) and connected to the photosensitive drum (1); a drum shaft (3) which axially projects from the drum gear (2) and rotatably supports the photosensitive drum during operation; and a boss (4) which axially projects from an end surface of the drum shaft (3), wherein: a first tooth (5a) and a second tooth (5b) are arranged on a side wall (4b) of the boss (4), the first tooth (5a) being obliquely arranged on the side wall (4b) of the boss, and the second tooth (5b) projecting from the side wall (4b) in an radial direction of the boss; and the first tooth (5a) is adapted to be engaged with one of the twisted-surfaces (12) in the recess (11), and the second tooth (5b) is adapted to abut one of edges corresponding to the other two twisted-surfaces.