(under subclass 545) Subject matter wherein the incremental rotation of the platen* is accomplished by way of an element or an assemblage of elements, which element or assemblage is moved to-and-fro by two cam surfaces that act together on the same rotating member, and which element or assemblage is connected to the platen.
(1) Note. A "cam surface" is defined as the edge periphery of a disc that rotates about an axis, the radial distance from the axis to the periphery varying around the periphery. As the disc rotates, the distance of a follower that is in contact with the periphery will increase and decrease relative to the axis of the disc, thus the rotation of the disc will substantially effect radial movement of the follower. The cam surfaces may be on separate disc elements or may be on a single member having separate cam surfaces.
