| 摘要 |
PROBLEM TO BE SOLVED: To perform stably both sides continuous copying process by a through pass system with a simple control sequence and a simple control mechanism whatever the environment in by setting the number of sheets of supply papers of a transfer material per a prescribed time for a transfer region to a prescribed number of sheets of papers corresponding to the environment. SOLUTION: A temperature detecting element for detecting its surface temperature is provided on the peripheral surface of a fixing roller 115 abutting on it. When the temperature detecting element detects a value within the range of 180-200 deg.C at the time of both sides continuous copying, a control mechanism 104 judges that the device is in normal environment. And, the number of sheets of a transfer material supplied to a transfer region Z from supply cassettes 110, 111 per unit cycle is set to 5 sheets. Meanwhile, when the temperature detecting element detects a value of <=180 deg.C, a control mechanism 104 judges that the device is in a low temperature environment. And, the number of sheets of a transfer material supplied to a transfer region Z from supply cassettes 110, 111 per unit cycle is changed to 4 sheets. |
