| 摘要 |
PURPOSE:To recognize a failure in a fixing roller before an abnormal state is obtained, in the image forming device of a copying machine, a laser printer, etc. CONSTITUTION:A fixing device having the fixing roller 1 contacting with a recording material carrying an unfixed image to carry out imagefixing is constituted so that speed detecting means 25 and 26 for detecting the recording material carrying speed of the fixing roller 1, and a predicting means 30 predicting the life of the fixing roller 1 based on a recording material carrying speed detecting value are provided, as a characteristic. |
