| 摘要 |
PURPOSE:To effectively/practically use a transfer material used for the measuring work of the nip area of a fixing device, that is, a transfer material is used for the measurement of the nip area of several times. CONSTITUTION:In the fixing device, a nip part, holding, pressing and carrying the transfer material (paper sheet) by a heating part 42 having a heater 43 as a heating element and a pressure roller 44. A nip area measuring means measures the size of the area of the nip part, to recognize the strength of pressure applied to the transfer material in the nip part. At this time, a process for holding a part of the transfer material in the nip part by the stopping of a carrying means after the transfer paper is fed by a paper feeding roller 18 and a specified time Tn lapses is executed. The specified time Tn is variably set in accordance with the number of the measuring times of the nip area N obtained from a counter by a Tn setting means, to change an image forming region and measure the nip area several times in a transfer material. |
