| 摘要 |
A printing unit for rotary, frame or cylinder (20) silk-screen printing machines, which are used for printing of substrates, and in particular textiles. Two spindles (50) for each printing unit drive a ring (30) of the printing cylinder (20), whereas each spindle (50) is controlled by means of a brushless-type electric motor (60), an epicycloidal reduction gear (70) with reduced play, a toothed drive belt (10), and ball bearings which have a small cross section, such that the digital drives of the electric motors (60) control the speed of the motors (60) in a closed loop. The digital drives are in turn controlled by axis control cards which are integrated in a PLC, in order to obtain synchronisation of the motion of the cylinders (20) and of the conveyor belt (40) for the substrate to be printed.
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