| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost and to prevent serious trouble from being caused by discriminating the existence of a recording medium (sheet) by using a temperature sensor. SOLUTION: A temperature sensor 8 functioning as a temperature detection means is arranged on a downstream side with respect to the carrying direction of the recording medium, and it is connected with a discrimination means 9 constituted of a microcomputer. It is desirable to arrange the sensor 8 near the downstream side of a nip between a fixing roller 2 and a pressure roller 3 in order to quickly detect the temperature change of the roller 2 due to the passage of the recording medium. The microcomputer is operated based on a previously stored program, so that it functions as the discrimination means 9 and discriminates the existence of the recording medium passing through the fixing device 1 based on the temperature change of the roller 2 detected by the sensor 8. When the discrimination means 9 discriminates that the trouble such as paper jamming is caused, the operation of the device 1 is stopped. |
