POST- OFFSET OPERATOR "offset machine operator" means a worker who: a) sets and operates a machine in which separate sheets of paper ,tinplate or other materials are printed by roller which obtains an ink impression from engraved (lithographic) plate; b) cleans inking rollers and replaces them in machine; c) examines plates for defects; d) washes plate to remove protective coating and makes surface more ink attractive; e) packs back of plate with tissue paper to obtain desired printing thickness; f) clamps plate in position on cylinder, adjusting it for correct tension; g) inserts packing under blanket or impression roller until roller has correct diameter: h) fills inks fountain and regulates flow of ink on inking rollers; i) adjusts space between cylinders according to thickness of sheets to be printed and sets waterdamping rollers to deliver proper moisture to non-image portion of plate cylinder; j) runs off several proof sheets and make further adjustments if necessary; k) sets and adjusts paper guides and checks paper feed; l) starts press and ensures that printing proceeds correctly; m) mixes ink and adjust machine for numbering and perforating; and n) performs daily maintenanc