| 摘要 |
Means to operate the mobile part of an advertisement display stand with image renewal; the aforementioned display stand being the type comprising a fixed transparent part and another transparent parallel, mobile part facing it, one of them fitted with an opacity mask and the other with a number of fragmented images which are interspersed in line with the opacity pattern, so that by adjusting the position of the mobile part in relation to the fixed part, the visualization through the open spaces of the opacity mask of the fragments of one of the images or another in cooperation with the internal lighting may be selected, where the aforementioned means comprise a number of motors that act on different areas of the mobile part, these motors being synchronised by means of a circuit that enables their calibration and levelling.
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