Turret indexing and registration means for multi-color printer

Claim 1

In a printing assembly having a turntable, a frame, said turntable being supported on a support means, said support means mounted at one end thereof in said frame to provide for rotation of said turntable, a plurality of printing stations spaced about the periphery of said turntable, a corresponding number of printing machines being operatively positioned at each of said spaced printing stations, and a plurality of platens at least equal to the number of printing stations, each platen supported on said turntable, the improvement comprising indexing means and locking means for successively indexing, registering and locking said platens at said stations prior to a printing cycle and having a drive shaft mounted on said turntable frame, said drive shaft rotatable about a central axis thereof, an actuating means disposed about said drive shaft and responsive to the rotation of said drive shaft, a drive arm mounted on said drive shaft for rotation therewith, said drive arm having a first roller means and a second roller means mounted on opposite ends thereof, a drive wheel concentrically mounted about said turntable support means, each of said first and second roller means being operatively engageable with said drive wheel to rotate said turntable in a continuous series of increments, such that in each increment of rotation, said turntable is moved until said actuating means stops rotation of said drive shaft after a preselected angular distance and said locking means operates in conjunction with said indexing means to register and lock said turntable prior to initiation of said printing cycle to assure that each platen is positively locked into a desired position and is accurately registered at each station during each said printing cycle, said locking means having a locking pin fixedly mounted on the periphery of said turntable at each station, a locking bar, a rod, said rod pivotally mounted at a first end thereof to said frame, an arm, said arm extending from said rod and captivated in a cam, said cam mounted concentrically on said drive shaft for rotation therewith, said rod being connected to said locking bar at a secoond end thereof, said cam rotating to drive said locking bar vertically to engage said locking pin and guide means fixedly positioned at at least one of said stations to direct the vertical movement of said locking bar in the engagement of said locking pin to assure accurate and positive registration of said turntable.