| 摘要 |
Machine for mounting flexible printing plates on plate-holder cylinders and for printing proofs with the cylinders thus prepared, the machine being frontally provided with a counterpressure drum and with a beam which are horizontally parallel and move with respect to each other between a mounting position and a printing position. The counterpressure drum can rotate and is covered with a sheet of paper having registration markings. The beam is provided with supports that rotatably support a plate-holder cylinder. The machine comprises: an optical device with a semitransparent mirror, adapted to align directly-viewed points of the plate-holder cylinder in mounting position with reflected points of the sheet of paper; at least two video cameras, positionable along a bar that lies parallel to the drum and the cylinder and directed towards the plate-holder cylinder, which is in the mounting position, along respective axes that intersect the optical device and are substantially at right angles to the axis of the plate-holder cylinder; and front monitors connected to the respective video cameras.
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