| 摘要 |
Preventing a paper jam as much as possible when actual paper size differs from designated paper size with increasing throughput by starting conveyance of a second sheet before detecting the length of a first sheet. Unless a register sensor has detected the rear edge (step S 303 ), start of feeding the next sheet is checked (step S 304 ). If started, a prescribed value 1 is applied (step S 305 ). If not started, a prescribed value 2 is applied (step S 306 ). Unless the rear edge is detected before a timer measures "estimated time+prescribed value" (step S 307 ), a paper jam decision is made (step S 308 ). If the rear edge is detected before the timer measures the "estimated time+prescribed value" (step S303), the processing is completed without making a paper jam decision. Making the prescribed value 1 less than the prescribed value 2 enables reducing the paper jam caused by incorrect setting.
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