| 摘要 |
The invention relates to a printing device (1) for simultaneously imprinting both sides of individually discrete substrates (14) or a substrate web (24) with a printable medium. The inventive device consists of an upper and a lower printing group (2, 3) which are arranged at a distance exactly opposite each other. A gap (38) between the printing groups can be adjusted by means of lift adjusting devices (4). The substrates or the substrate web run/s through said gap. The rollers (5, 7, 15, 17) and the cylinders (6, 8, 16, 18) of the upper and lower printing group are fixed on bearing plates (30, 39) by means of flange bearings (29). The bearing plates (30) of the upper printing group (2) are connected to ball and rail guiding devices (33, 34, 35, 36) which can be displaced along rails (31, 32). The lift adjusting devices (4) are therefore provided with drive motors (25). The shafts (47) of said motors are connected to the shafts of spindles (26) by means of sliding sleeves (37). The lower ends of the spindles circulate in thrust bearings (28) which are laterally fixed on the bearing plates (30) of the upper printing group (2).
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