Abstract: A planetary gear device using non-circular gears comprising a casing, an input shaft rotatably supported in the casing and driven for rotation by a drive source, a carrier fixed on the input shaft, an output shaft rotatably supported in the casing, a rotary body concentric with the input shaft and rotatably supported in the casing, and a planetary gear unit rotatably supported on the planetary shaft. The planetary gear unit integrally comprises a main driving gear and a driven gear. The planetary shaft is connected at one end thereof to the carrier and at the other end to the rotary body. Fixed on the output shaft is an output gear meshing with the driven gear. Fixed to the casing is a fixed gear meshing with the main driving gear. At least either the combination of the main driving gear and fixed gear or the combination of the driven gear and output gear forms a pair of non-circular gears.

Abstract: A device for mounting a plastic film based resin plate for use in printing on a plate cylinder has a groove formed along one longitudinal side edge of each of two members having a symmetrical semicircular section and constituting a plate cylinder, each of said two members consisting of a plate cylinder proper and a plate cylinder outer ring, a fixing member made of a resilient material and having a wedge-shaped protrusion adapted to fit into said groove, said fixing member being fixedly secured to a freely rotatable support shaft which is mounted at a position adjacent to groove and is connected through a linkage to a first operating rod.