| 摘要 |
PROBLEM TO BE SOLVED: To improve a suction property of a printing plate by minimizing a leakage of a negative pressure from suction grooves outside the printing plate when the suction grooves are formed such that printing plates of a plurality of sizes may be subjected to suction. SOLUTION: A group of suction grooves 120 is provided with a transverse groove 124A along a leading end reference line 104 and longitudinal grooves 122A-124E and transverse grooves 124B-124F fitted to the sizes of printing plates 12A-12C. A longitudinal groove 122 and a transverse groove 124 are mainly formed by a main groove part 116 of a specific width. A specific area of the main groove part 116 crossing with peripheral ends of printing plates 12A, 12B is formed by a shallow groove part 118 where a cross section of the opening is made smaller by making a groove depth shallow. Thus, a leakage of a negative pressure from the main groove part covered by the printing plates 12A, 12B may be suppressed when the printing plates 12A, 12B are to be subjected to suction, and a desired suction force may be obtained without providing a negative pressure source of a large capacity.
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