| 摘要 |
The invention relates to a device for the display of advertising messages which comprises two rollers 7, 8 for winding and unwinding a flexible member (9), such as a sheet which bears advertising messages which can be seen through a front screen, within a body (1) with a transparent front screen (3) which is illuminated from the rear. Each roller (7,8) is driven by a transmission which includes an idling wheel (15, 16, 25, 26) so that when one roller winds up the flexible member the other roller idles thus permitting unwinding of the said member (9). |
