| 摘要 |
PROBLEM TO BE SOLVED: To recognize no problem caused in a skew detecting processing result throughout a continuous printing prior the printing start by predicting the number of printable sheets on the basis of the detected skew quantity per unit feed quantity of a rolled recording medium, and notifying a user of this number. SOLUTION: After the set of a roll medium in a prescribed position is confirmed (S11), the right (or left) position of the tip is detected (S12). The roll medium is fed by a fixed quantity in sub-scanning direction, and the right (or left) position is detected again (S13). The first detected position is compared with the second detecting position to calculate the skew quantity (S14). When the skew quantity is within a regulated value, 'no skew' is judged, a feed quantity L' such that the total layer slippage makes the side end position of the roll medium reach the allowable limit is determined (S17). On the basis of the value L' and the length of image size (or paper size), the number of printable sheets is determined, and this is indicated to a user by an operation part (S18).
|
