Patent ID: 9740154
Date: 2017-08-22
CPC Classifications: G03G

Claim:
1. An image forming device comprising: an image forming unit configured to form an image on paper fed from a paper housing unit; a heater lighting control unit configured to determine, based on a temperature detected by a temperature detecting unit in a fixing unit at least including a fixing roller that holds and carries the paper on which the image is formed, a pressure roller arranged in pressure-contact with the fixing roller, a heater that heats the fixing roller, and the temperature detecting unit arranged in a vicinity of the heater, a lighting rate of the heater; and a paper determination unit configured to determine information related to the paper based on lighting rates of the heater in standby and in printing which rates are determined by the heater lighting control unit, wherein the paper determination unit compares a reference lighting rate, which is a lighting rate of the heater in printing estimated based on the lighting rate of the heater in standby and setting of grammage with respect to the paper housing unit, with the lighting rate of the heater in printing which rate is determined by the heater lighting control unit, and determines smoothness as the information related to the paper based on a result of the comparison.