| 摘要 |
An ink jet printer 20 of the present invention can carry out a head check on whether or not ink is normally ejected from nozzles 23 , by having a voltage detection circuit 54 detect electrical change resulting from ejecting of charged ink droplets onto an ink receiving area 52 . When instructed to do borderfree printing, the ink jet printer 20 has a voltage application circuit 50 to charge ink in the print head 24 , and ejects ink onto an area within the ink receiving area 52 where a recording sheet S is present and an area where a recording sheet is not present. The ink jet printer 20 also carries a print head 24 and determines a front edge of the recording sheet S based on a position where a voltage detection circuit no longer detects voltage. Thus, the ink jet printer 20 determines a front edge, side edges, and rear edge of the recording sheet S by directly using ink. Determination of a position of the edge of the print medium is thus secured with greater accuracy than with any method in which anything other than print recording liquid is used and in which the position is indirectly determined.
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