Transfer bias control method for image forming apparatus using electrophotographic process

摘要

A method for controlling a transfer bias in an image forming apparatus using an electrophotographic process to prevent front and rear ends of a paper from being contaminated by inversely charged toner. The image forming apparatus applies a second positive bias voltage having the intermediate level between a transfer voltage and a first positive bias voltage for cleaning the inversely charged toner with respect to the front and rear ends of the paper. In this manner, it is possible to prevent an electric shock on the photosensitive drum due to an abrupt voltage difference between the transfer voltage and the first positive bias voltage.