Transport device for the print unit of printing machines.

摘要

The device comprises an electric motor (16) whose rotor is capable of rotating selectively in either direction and a transmission unit (21) comprises a sleeve (31) carrying a gear (19) at an input end in mesh with a pinion (18) on the motor shaft. At the output end of the sleeve (31) a toothed pulley (28) is engaged with a tensioned, toothed belt (29) for moving the print unit back and forth. The sleeve (31) is journalled on a shaft (33) which can shift laterally atthe input end and is urged by a spring (44) and lever (42) to shift in the sense forcing the gear (19) into mesh with the pinion (18), thereby to minimise the radial clearance between the pinion and the gear.