| 摘要 |
The drive system for rotating prism-type display boards of the present invention comprises a mechanical system (5) consisting of: a vertical spindle guided axially in a vertical direction XX′ in a housing (6) and comprising above the top wall of the crossmember of a frame a dog clutch (9) engaging directly with the corresponding moving part; and a drum (10) with attached pins (12, 13, 14), the drum being housed in the housing (6) and engaging both with the vertical spindle and with a cam (70) of the drive module (7).
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