| 摘要 |
In a page printer (3), a controller (7) calculates the length of paper from a paper size specified by a host computer (1) and notifies a printing portion (11) of the calculated paper length, and the printing portion (11) executes the feeding of paper (13) which is set based on the assumption that the paper (13) has the paper length notified by the controller (7). The printing portion (11) measures the actual length of the paper (13) during the paper feeding and notifies the controller (7) of the measured actual paper length, while the controller (7) judges in accordance with the actual paper length notified by the printing portion (11) whether there is present a paper size error. If it is found that the paper size error is present, then the controller (7) assumes the actual width of the paper (13) from the actual paper length of the paper (13), and then compares the actual length and width of the paper (13) with the greatest length and width of a printed image. Only when the comparison results show that the paper (13) is smaller than the printed image in at least one of the length and width thereof, the controller (7) instructs the printing portion (11) to allow for the cleaning of a transfer drum (19).
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