IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes an image carrier, a development device and a guide part guiding the development device to the image carrier. The development device includes a magnet roller, which includes a shaft having magnets arrayed circumferentially, and a cover member, which include a bearing part engaged with the guide part as the shaft is inserted thereinto. The shaft and the bearing part include an engaged part and an engaging part restricting a circumferential position of the magnet and including contact faces provided along an action direction of force from the guide part to the bearing part when the bearing part is engaged with the guide part and the development device approaches the image carrier. A clearance is provided between an outer circumferential face of the shaft and an inner circumferential face of the bearing part at an upstream side in the action direction from the contact faces.

主权项

1. An image forming apparatus comprising:
an image carrier rotatbly supported centering on a spindle; a development device developing an electrostatic latent image formed on the image carrier; and a guide part guiding the development device in an approaching direction to the image carrier in a direction orthogonal to an axial direction of the spindle, wherein the development device includes: a magnet roller including a shaft on which magnets are arrayed along a circumferential direction and a rotation sleeve incorporating the shaft to carry a developer on a surface of the rotation sleeve by a magnetic force of the magnets; and a cover member includes a bearing part formed into a hollow boss-like shape projecting to the outside in an axial direction of the shaft and engaged with the guide part as an end part of the shaft is inserted thereinto, the end part of the shaft and the bearing part include an engaged part and an engaging part formed respectively so as to come into face contact with each other and so as to restrict a position of the magnet in the circumferential direction of the shaft, the engaged part and the engage part include respective contact faces provided along an action direction of a force acting from the guide part to the bearing part when the bearing part is engaged with the guide part and the development device approaches the image carrier, the development device is configured so that a clearance is provided between an outer circumferential face of the shaft and an inner circumferential face of the bearing part at an upstream side in the action direction of the force from the contact face of the engaged part and the engaging part.