Printing press having carriage mounted interchangeable plate cylinders

A printing press comprising:

• a frame;
• a blanket cylinder rotatably supported by said frame, said blanket cylinder being positioned for contacting and transferring images to a web of paper passing through the press;
• a pair of plate cylinders rotatably mounted to a carriage, said carriage being mounted to said frame and being moveable along a linear path between a first and second position, one of said plate cylinders being in contact with said blanket cylinder at a point of tangency when said carriage is in said first position, the other of said plate cylinders being in contact with said blanket cylinder at the same said point of tangency when said carriage is in said second position.

A printing press comprising:

• a frame;
• a blanket cylinder rotatably supported by said frame, said blanket cylinder being positioned for contacting and transferring images to a carrier material;
• a pair of rotatable plate cylinders adapted to transfer images to said blanket cylinder, said plate cylinders being slidably mounted to said frame and being moveable along a linear path, each of said plate cylinders being selectively moveable into a common operative position parallel to and in contact with said blanket cylinder.