Patent ID: 6840173

Claim:
A plate cylinder equipped with at least two printing plates wrapped around the outer circumference thereof, comprising: printing plate holders provided each per printing plate for holding said printing plates on the outer circumference of said plate cylinder, wherein one printing plate holder of said printing plate holders is provided in a stationary state and fixed against said plate cylinder, and other printing plate holders of said printing plate holders are provided adjustable to move in the circumferential direction of said plate cylinder and fixable against said plate cylinder, wherein said plate cylinder has an attaching groove formed in the outer circumference thereof and extending in parallel with the axial direction for attaching said printing plate holder therein, said other printing plate holders comprising a first gear operative in response to an external operation to rotate about an axis in the radial direction of said plate cylinder, a second gear mating with said first gear and operative in accordance with the rotation of said first gear to rotate about an axis in the direction parallel to the tangent of said plate cylinder, threaded rods provided integrally with rotary shafts at both sides of said second gear and having male screws formed at both ends, and a pair of pushers, each having a female screw formed to mate with said threaded rod, for moving in the direction parallel to the tangent of said plate cylinder relative to said printing plate holder body, to push either of both inner walls in said attaching groove in the circumferential direction of said plate cylinder, wherein gaps are formed between both sides of said other printing plate holders in the circumferential direction of said plate cylinder and said inner walls in said attaching groove in the circumferential direction of said plate cylinder, and said threaded rods at both sides have the same male screws formed thereon.