Patent ID: 7813681

Claim:
An image forming apparatus for developing an electrostatic latent image on a photosensitive body by allowing said photosensitive body to be come into contact with a developing roller, wherein a contact pressure between said photosensitive body and said developing roller is set in such a manner that, when a strip-shaped polyethylene film whose thickness is equal to 0.03 mm and whose width is equal to 5 mm is inserted into between said photosensitive body and said developing roller, a dynamic frictional force between said polyethylene film and both of said photosensitive body and said developing roller is equal to or larger than 30 gf when the film is pulled, and wherein a shaft bearing portion is configured for bearing the developing roller, and the image forming apparatus is configured to change a position of the shaft bearing portion, and wherein the contact pressure is set through changing the position of the shaft bearing portion.