| 摘要 |
<p>A printing plant (10) for web material comprises a conveyor belt (11) for moving the web (13) to at least one printing station (14), in turn comprising a printing screen (17) and means (18) for printing of the screen on the web (13). The screen (17) is supported in the station by power-driven means for the relative movement thereof with respect to the station, to enable a precise screen positioning relative to the web (13) to be printed. In particular, the screen (17) can be supported by power-driven means (23) for moving it transversely of the web (13) and a control device (22) detects the mutual shifting in a transverse direction between the printing position on the web (13) and the screen and drives the transverse-movement means (23) of the screen to cancel this shifting. In addition, the printing screen (17) can be supported by power-driven means (36,37,38) for moving it in a direction longitudinal to the belt running direction. In this case, on stopping of the belt (11), the control device (22) detects the mutual longitudinal shifting between the printing position on the web (13) and the screen (17) and operates the power-driven longitudinal-movement means (36, 37, 38) of the screen (17) to cancel this shifting. <IMAGE></p> |
