Image forming apparatus

Abstract

An image forming apparatus provided by the present invention includes a plurality of image carrying members, an intermediate transfer belt, a plurality of rollers, and a correcting mechanism. The intermediate transfer belt is endless and, to it, toner images formed on the image carrying members respectively are transferred by being sequentially superposed on each other. The correction mechanism includes a slanted bearing, which rotatably supports a tension roller, and a main body guide roller which makes contact with the slanted bearing when it moves as a result of the intermediate transfer belt meandering and moves the slanted bearing along with one end of the tension roller in the axial direction in the direction perpendicular to the axial direction to correct meandering of the intermediate transfer belt with respect to the tension roller. The main body guide roller is a rotary member which rotates while in contact with the slanted bearing.

Description

technical field [0001] The present invention relates to an image forming apparatus. Background technique [0002] Among electrophotographic image forming apparatuses such as copiers and printers, there is known an image forming apparatus of an intermediate transfer method in which toner images of different colors formed on the outer peripheral surfaces of a plurality of photosensitive drums are sequentially superimposed on each other. The toner image is first transferred to an endless intermediate transfer belt arranged along a plurality of photosensitive drums (image carrier), and then the toner image is secondarily transferred to paper. In this image forming apparatus, there is a problem that the intermediate transfer belt deviates in the axial direction of the rollers rotatably extending the intermediate transfer belt, and the intermediate transfer belt snakes. [0003] In response to this problem, a technique of correcting the meandering of the intermediate transfer bel...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional image forming apparatus, if a structure in which the roller is greatly inclined to improve the performance of the correction belt in meandering is adopted, the size of the axial displacement portion needs to be increased in the axial direction, and there is a problem of increasing the size of the apparatus.

In addition, when adopting a configuration in which the size of the shaft displacement portion is maintained and the roller is greatly inclined, the angle of the inclined surface of the shaft displacement portion needs to be increased, and the frictional force between the shaft displacement portion and the shaft guide portion may increase. sex

Therefore, there is a problem that the contact portion between the shaft displacement portion and the shaft guide portion is difficult to slide, and the wear of the shaft displacement portion and the shaft guide portion becomes severe.

Images