| 摘要 |
A method and apparatus for replacing a printing plate enabling to easily replace the printing plate of a plate cylinder of a printing unit in an easy posture in a variable cutoff rotary press of a web offset press or the like is realized. Upon replacing the printing plate wound around a plate cylinder by using a scaffold installed between a plurality of printing units 05a through 05d disposed at an interval along a travel path of a web, the method includes a step of dividing a part of the scaffold on a side where work for replacing the printing plate is performed, and constructing the divided scaffold to be capable of being raised and lowered, forming a released web area of the web 11 in a region from an in-feed section 04 to a dryer section 07 by forming a clearance between blanket cylinders 17a and 17b for nipping the web from both sides in the printing unit, a step of lowering the divided scaffold to a position adapted for the work for replacing the printing plate of an upper plate cylinder 15a while pressing down the web with a lower surface of the divided scaffold by utilizing a sag of the web in the released web area, and a step of performing the work for replacing the printing plate of the upper plate cylinder by using the divided scaffold.
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