| 摘要 |
<p>Disclosed is an offset printing device in which a printing-plate table (4) and a base-plate table (6) are movably provided on a guide rail (2) which is provided on a stand (1). A transfer mechanism (9) is provided at a location on the guide rail (2) corresponding to an intermediate section thereof in the longitudinal direction, the transfer mechanism (9) comprising: a blanket roll (10); a blanket roll raising/lowering actuator (13); a blanket roll height sensor (14); and a pressure sensor (15) for detecting the contact pressure of the blanket roll with respect to a printing plate (3) or a base plate (5). Furthermore, a controller controls the raising/lowering actuator (13) in such a way that the contact pressure detected by the pressure sensor (15) when the blanket roll (10) contacts the printing plate (3) or the base plate (5) reaches a prescribed value. The contact pressure when transfer is performed from the printing plate (3) to the blanket roll (10) and the contact pressure when re-transfer is performed from the blanket roll (10) to the base plate (5) are both made uniform, whereby the amount of deformation of the portion which contacts the printing plate (3) or the base plate (5) is made uniform and the peripheral speeds are made equal. As a result, the printing precision can be improved.</p> |
