| 摘要 |
A printing press is provided. The printing press includes a print unit printing a stream of printed products, the printed products having a first pitch. The printing press also includes a pitch changing device. The pitch changing device includes an upper roller mounted on an upper axle, a lower roller mounted on a lower axle, the upper and lower rollers forming a roller nip, and a motor driving the upper and lower rollers in opposite directions. The nip receives the stream of printed products. The motor varies the velocity of the nip and the printed products using an electronic cam velocity profile so as to alter the first pitch. A method is also provided.
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