Cantilevered blanket cylinder lifting mechanism
An offset print unit includes a plate cylinder, a blanket cylinder having an end and a blanket gear coaxial with the blanket cylinder, a drive axle or pinion supporting a gear driving the blanket gear and a blanket lift arm for selectively supporting the end to cantilever the blanket cylinder, the blanket lift arm being rotatable about the drive axle or pinion. A method is also provided.
1. An offset print unit comprising:
a plate cylinder;
a blanket cylinder having an end and a blanket gear coaxial with the blanket cylinder;
a sleeve-shaped, axially removable blanket for mounting on or removing off the blanket cylinder while the blanket cylinder is cantilevered;
a drive axle or pinion supporting a gear driving the blanket gear; and
a blanket lift arm for selectively supporting the end to cantilever the blanket cylinder, the blanket lift arm being rotatable about the drive axle or pinion.
2. The offset print unit as recited in claim 1 wherein the blanket lift arm includes an eccentric surrounding the drive axle or pinion.
3. The offset print unit as recited in claim 1 wherein a contact point between the blanket lift arm and the end for cantilevering is adjustable.
4. The offset print unit as recited in claim 1 further comprising an adjusting screw for adjusting a cantilevering position of the blanket lift arm.
5. The offset print unit as recited in claim 1 further comprising a pneumatic cylinder actuating the blanket lift arm.