Patent ID: 8424270

Claim:
An apparatus for printing on a gelatin ribbon comprising: a motor driven cylindrical casting drum which forms a gelatin ribbon around a portion of its outer periphery, a cylindrical print roll having a pattern formed on and around its outer periphery, said print roll positioned relative to said casting drum so that said gelatin ribbon is sandwiched in between and in contact with both said casting drum and said print roll and so that the print roll is rotary driven by said casting drum solely through frictional contact with the gelatin ribbon, an ink tray containing ink, a rotary ink roller having a first portion submerged in the ink in said ink tray and a second portion in contact with the outer periphery of said print roll so that rotation of said print roll rotatably drives said ink roller in synchronism with said print roll solely through frictional contact between said print roll and an inked portion of said inking roller, said ink roller transferring ink onto said patter on said print roll and said print roll transferring ink from said pattern onto said gelatin ribbon during rotation of said casting drum, said print roll and said ink roller, a doctor blade having an edge arranged closely adjacent to an outer periphery of said inking roller, such that said doctor blade is configured to scrape excess ink from said inking roller during operation of the apparatus, and a manually operated print roll adjustment mechanism configured to provide the sole mechanism for adjusting the position of said print roll relative to said casting drum.