| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable multi feeding to be surely detected for each type of sheets, and enable a first printed matter set with possibility of multi feeding to be easily detected in a case in which there is possibility of multi feeding in the first printed matter set.SOLUTION: An image formation device which receives a print job for sealed document containing a preparation instruction of a plurality of printed matter sets consisting of envelopes and contents and prints envelope data and content data on mutually different types of sheets in accordance with the instructed order to discharge the sheets as printed matter, includes: a multi feeding sensor 13d (detection means) which emits light for each sheet on which the envelop data and the content data are printed and detects a light quantity of transmission or reflection for each sheet; and an image formation controller 37 (multi feeding determination means) which compares the light quantities detected by the multi feeding sensor 13d with respect to the first and second printed sheets for each type of the sheets, and determines the presence or absence of the occurrence of multi feeding for each type of the sheets on the basis of the comparison result.</p> |
