| 摘要 |
A printing press is provided in which reliable, automatic cutting control can be performed and can be made stable at an early stage so that spoiled paper can be reduced. A web offset press includes a cutting cylinder, a mark detector, a compensator roller, and a cut-off control unit having an exact-cutting control mode for adjusting cutting positions of a web by changing the position of the compensator roller on the basis of cutting timing and the detection timing of a cut mark detected in a gate signal having a predetermined relationship therewith. The cut-off control unit further has a rough-cutting control mode in which the mark detector detects a mark set for the entire surface of the web, and the position of the compensator roller is changed on the basis of a deviation between the detection timing of the mark and the cutting timing so that the cut-mark-detection timing falls within the gate signal.
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