| 摘要 |
The system is comprised of a thin box (1) presenting on its front face (2) one or a plurality of horizontal rows (3, 3') of equidistant windows (20a), inside which are situated one or more assemblies of rollers-guides (13, 23) and tensioning axes (15a, 15b) which support slidable support tapes (12) on the external surface of which are placed the graphics, digits or letters (4, 4', 21a) which will appear successively when displacing manually each tape through the respective window. There can be a multiplicity of rollers or axes, with two intermediary tensioning smooth or simple axes or rollers, with a single intermediary tensioning smooth axes or rollers (16), provided with bushes having discs (14), as many of them as there are tapes in each assembly. Each of the windows of the row corresponds to a single slidable support tape so that, in each window, only the graphic, letter or digit, situated behind said window will be seen from the outside. The assembly of axes and elements guide and separators enable to arrange a series of continuous or discontinuous tapes, in an amount equivalent to the number of separations or windows in the front opening. If the tapes are continuous tapes, they have a smooth rear extreme axis, two identical intermediary axes for the tensioning, and a front axis on which is situated a series of serrated bushes (27) forming the drive element, independently for each tape. In the internal face of the body, a group of vertical pivots (22) forms guides which will impede the lateral displacement of the tapes; in the area of the rear axis there is also an assembly of U-shaped supports (22a) in the cavities of which is situated precisely said axis (23). On the internal face of both sides of the body, two symmetric or non symmetric supports (29) are fixed, said supports being provided with recesses (32) wherein are press-fitted the extremities of the rear (23) and tensioning (24 and 25) axes, whereas the front extremity has similar recesses (33) so that the front axis (26) is nested and secured with sufficient separation to enable the positioning and rotation of the serrated bushes (27) for driving the tape. The window (20, 20') can be situated in the front part or in the rear part or in both at the same time.
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