Cylinder setting mechanism for an offset printing machine

摘要

A cylinder setting mechanism for an offset printing machine effects setting of a rubber blanket cylinder into peripheral contact with an impression cylinder and the plate cylinder sequentially. Eccentric metal parts are rotatably mounted for rotation on laterally spaced frame vertical walls for rotation about a first axis and rotatably mount an eccentric rubber blanket cylinder shaft for rotation about a second eccentric axis. The eccentric rubber blanket cylinder shaft rotatably mounts the rubber blanket cylinder eccentrically about a third axis eccentric to the axis of rotation of the shaft. A plate cylinder setting cam and an impression cylinder setting cam are fixedly secured to the impression cylinder rotate therewith and are angularly offset. A plate cylinder setting mechanism includes a first toggle mechanism coupled to the eccentric metal part and a plate cylinder setting mechanism striking bar operatively positioned with respect to the plate cylinder setting cam and coupled to the first toggle mechanism cause the rubber blanket cylinder to be brought into and out of engagement with the plate cylinder. An impression cylinder setting mechanism includes a second toggle mechanism coupled to the eccentric rubber blanket cylinder shaft and an impression cylinder setting mechanism striking bar operatively positioned with respect to the impression cylinder setting cam and responsive thereto is coupled to the second toggle mechanism.