| 摘要 |
<p>PURPOSE:To prevent the detection of jam caused by the slight abrasion of a conveying means by measuring the time required for the movement of a sheet of paper at a defined distance and correcting the set value of a jam judging timer based on the measured data. CONSTITUTION:By measuring the time from the start of rotation of a first paper feed roller 24 or a second paper feed roller 25 to the detection of the end of a sheet of copying paper by means of a jam sensor 29, the set value of a jam judging timer is corrected based on the measured data. That is, based on the measured-time data, when the time required for the movement of a sheet of copying paper is gradually varied with the use of a device, e.g., due to the abrasion of the first and second rollers 24, 25 and a timing roller 28, data on the variation is obtained to correct the set value of the jam judging timer. Accordingly, the detection of jam being carried out due to the slight abrasion of a conveying means in spite of no hindrance in a copying action, is prevented.</p> |
