| 摘要 |
This invention relates to a sheet-fed offset printing press including a gear driven by an upstream drive motor, a gear rotationally driven by the upstream drive motor through the gear, an impression cylinder of an upstream printing unit group, and a transfer cylinder of a downstream printing unit group. The impression cylinder is rotationally driven by the gear and has a holding portion for holding a paper sheet W. The transfer cylinder is rotationally driven by a downstream drive motor and has a holding portion for receiving the paper sheet W from the holding portion of the impression cylinder. The printing press further includes an impression-cylinder-side peripheral speed measuring device for measuring the peripheral speed of the impression cylinder and a transfer-cylinder-side peripheral speed measuring device for measuring the peripheral speed of the transfer cylinder. The rotational phase difference between the impression and transfer cylinders is obtained from signals from the impression-cylinder-side and transfer-cylinder-side peripheral speed measuring devices.
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