Patent ID: 9740143
Date: 2017-08-22
CPC Classifications: G03G

Claim:
1. An image forming apparatus, comprising: a transfer unit that transfers a toner image on an image bearer onto a transfer medium; and a controller that controls a transfer voltage to be output to the transfer unit in accordance with a certain condition, wherein the controller: applies currents having at least two different values during times in which paper is not being fed, the two current values being lower than a current value during paper feeding; estimates an output voltage on a basis of a voltage detected through the application of the currents; controls, when the estimated output voltage falls below a certain limiter voltage, to bring the output voltage to a value calculated through the certain condition; and controls, when the estimated output voltage exceeds the certain limiter voltage, to bring the output voltage to the limiter voltage, wherein the certain condition includes at least one of a linear velocity, a temperature or a humidity, a size of the transfer medium, a type of the transfer medium, a thickness of the transfer medium, resistance of a transfer portion that transfers the toner image from the image bearer to the transfer medium, and a position on the transfer medium in a transfer medium conveyance direction.