Equipment for driving plate cylinders of a printing machine

摘要

For printing machines furnished with a Direct Imaging system for preparation of printing plates there is designed an equipment, comprising an auxiliary drive unit (23) coupled with the plate cylinder (1), which is coupled with the gear wheel assembly by disenagageable coupling means. In the preferred embodiment the plate cylinder (1) is at one end accommodated in a bearing (27) of a print unit side wall (4) by means of a carrier (3) which is axially shiftable seated at the neck (2) of the plate cylinder (1) and is in a direct engagement with the plate cylinder (1). The carrier (3) is further by means of a belt drive coupled with an auxiliary drive unit (23) and by an electrically operated clutch (7) with an output wheel (6) of the gear wheel assembly. In another preferred embodiment the plate cylinder (1) is furnished with a mechanism for angular displacement and a mechanism for axial shift.