| 摘要 |
<p>Disclosed is a roll fed rotary web device such as a rotary offset or rotogravure web printing press or a collator, having an improved perforator. Also disclosed are examples of prior art perforators. The perforator is incorporated in a standard perforating cylinder which rotates during the process of perforation. Perforating blades are mounted in the perforating cylinder and several improvements relating to spring biased positioners of the perforating blade are illustrated.</p> |
