| 摘要 |
A perforating apparatus for perforating a sheet. The apparatus includes a plurality of perforating assemblies. Each perforating assembly includes a perforating wheel, which is operatively coupled to a pneumatic cylinder, and a plurality of air hoses, wherein each pneumatic cylinder of each perforating assembly is operatively coupled to, and in flow communication with one air hose of the plurality of air hoses. Further each pneumatic cylinder is associated with an air muffler. And the apparatus includes a secondary roller that includes a peripheral wrap around the outer surface thereof.
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