Printing apparatus having coating function

A printing apparatus having a coating function comprising a single rotary shaft means disposed adjacent to an impression cylinder, supported at both ends within apertures in a main unit frame means and driven to rotate synchronously with said impression cylinder, said main frame means comprising two integral main frame members each of which has an aperture therein and wherein said rotary shaft is supported at its both ends through said apertures, a numbering device, a relief imprinting cylinder, and a coating cylinder alternatively mounted detachably on said rotary shaft, an ink unit detachably mounted on a printing apparatus main unit for supplying ink to said numbering device or said relief imprinting cylinder, and a coater unit detachably mounted alternatively to said ink unit on said printing apparatus main unit for supplying a coating material to said coating cylinder, said outer diameter of said single rotary shaft being smaller than the inner diameter of said apertures of said frame means, said frame means including bearing metals and wherein said rotary shaft is supported at its both ends by said bearing metals, the central part of said rotary shaft intermediate its both ends which are supported by said bearing metals has a diameter which is smaller than an inner diameter of at least one of said bearing metals thereby enabling the removal of said rotary shaft in the axial direction without removing said bearing metals from said main unit frame means.