Process cartridge, electrophotographic image forming apparatus, driving force transmission part, and electrophotographic photosensitive drum

  • US 5,903,803 A
  • Filed: 03/26/1996
  • Issued: 05/11/1999
  • Est. Priority Date: 03/27/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An electrophotographic image forming apparatus for forming an image on a recording material, comprising:

  • an electrophotographic photosensitive drum;

    charging means for charging said photosensitive drum;

    developing means for developing a latent image formed on said photosensitive drum into a toner image;

    transfer means for transferring the toner image onto the recording material;

    fixing means for fixing the toner image on the recording material;

    a motor;

    a driving rotatable member for receiving a driving force from said motor;

    a twisted hole substantially coaxial with said driving rotatable member, said hole having a polygonal cross-section;

    a twisted prism projection provided at a longitudinal end of said photosensitive drum, wherein when said driving rotatable member rotates with said hole and projection engaged with each other, a rotational driving force is transmitted from said driving rotatable member to said photosensitive drum through engagement between said hole and said projection with said projection being pulled into said hole; and

    moving means for imparting relative movement between said hole and said projection in a longitudinal direction of said photosensitive drum.

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