| 摘要 |
An engine controller 21 discriminates defective conveyance of a sheet material 2 on the basis of information regarding the presence or absence of the sheet material 2 which is outputted from a TOP sensor 7 and an ejection sensor 17 (S202), discriminates to which one of a plurality of types of defective conveyance the defective conveyance relates, and transmits information regarding the defective conveyance to an image controller 23. If the information regarding the defective conveyance received from the engine controller 21 is information showing the occurrence of a feed delay jam, the image controller 23 transmits a jam clear command to cancel the feed delay jam to the engine controller 21.
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