Driving force transmission mechanism, image forming apparatus equipped with such a mechanism, and process unit of such an apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTakeshi Yasumoto, Akio Ono, Atsushi Numagami, Yukihiro Fujiwara, Kazunari Murayama, Shigeru Hoashi, Takahito Ueno
Life of this patent
Estimating the term…
Abstract
A drive transmission apparatus includes a first coupling portion having a polygonal shape; a second coupling portion having a hole portion which has a cross-sectional configuration larger than the first coupling portion, the hole portion being engageable with the first coupling portion; and a center shaft provided on the first coupling or the second coupling, the center shaft penetrating the other one of the first and second coupling.
Claims39
A drive transmission apparatus comprising:
- a first coupling portion;
- a second coupling portion having a hole portion which has a cross-sectional configuration larger than said first coupling portion, said hole portion being engageable with said first coupling portion;
- a center shaft being provided on one of said first coupling portion and said second coupling portion, and said center shaft penetrating the other one of said first coupling portion and said second coupling portion,
- wherein said center shaft is rotatable integrally with said first coupling portion and said second coupling portion;
- and
- a brake actable on said center shaft in its circumferential direction.
An image forming apparatus comprising:
- a photosensitive member;
- a flange member fixed to said photosensitive member;
- charging means for charging said photosensitive member;
- image forming means for forming an electrostatic image on said photosensitive member charged by said charging means;
- developing means for developing the electrostatic image;
- transferring means for transferring the image developed by said developing means onto a recording material;
- a driving source;
- a driver positioned and configured to transmit a driving force from said driving source to said photosensitive member;
- a first coupling portion;
- a second coupling portion having a hole portion which has a cross-sectional configuration larger than said first coupling portion, said hole portion being engageable with said first coupling portion;
- and
- a center shaft provided on one of said first coupling portion and said second coupling portion, said center shaft penetrating the other one of said first coupling portion and said second coupling portion,
- wherein one of said first coupling portion and said second coupling portion receives the driving force and is integral with said flange member, and the other one of said first coupling portion and said second coupling portion is provided on said driver.
An image forming apparatus comprising:
- a photosensitive member;
- charging means for charging said photosensitive member;
- image forming means for forming an electrostatic image on said photosensitive member charged by said charging means;
- developing means for developing the electrostatic image;
- transferring means for transferring the image developed by said developing means onto a recording material;
- a driving source;
- a driver configured and positioned to transmit a driving force from said driving source to said photosensitive member;
- a first coupling portion;
- a second coupling portion having a hole portion which has a cross-sectional configuration larger than said first coupling portion, said hole portion being engageable with said first coupling portion;
- a center shaft provided on one of said first coupling portion and said second coupling portion, said center shaft penetrating the other one of said first coupling portion and said second coupling portion,
- wherein said photosensitive member has one of said first coupling portion and said second coupling portion, and said driver has the other one of said first coupling portion and said second coupling portion;
- and
- a brake actable on said center shaft in its circumferential direction.
A process unit which is detachably mountable to a main assembly of an image forming apparatus having a driving portion, said process unit including process means actable on a photosensitive member, said process unit comprising:
- a flange member fixed to the photosensitive member;
- a coupling portion which is integral with said flange member and engageable with the driving portion of the main assembly of the apparatus;
- and
- a hole portion, provided in said coupling portion, configured and positioned to engage a center shaft provided in the driving portion.
A process unit which is detachably mountable to a main assembly of an image forming apparatus having a driving portion, said process unit including process means actable on a photosensitive member, said process unit comprising:
- a coupling portion engageable with the driving portion of the main assembly of the image forming apparatus;
- a hole portion, provided in said coupling portion, configured and positioned to engage a center shaft provided in the driving portion;
- and
- a brake actable on the center shaft in its circumferential direction.
Dependencies are inferred from the claim text.