| 摘要 |
Subject: endless rotation of advertising signs permanently stretched out at both dimensions. Constitution: flexible material 10 fixed onto and under two chains 11 via an array of springs 12, a shaft 13 setting into motion the two chains 11 rotated by toothed wheels 14 positioned at the ends of the shaft 13 (in this way the pitch is the same all through the movement), two cylinder 16, 17 the one of which 16 is solely rotating while the other 17 is fixed onto two reciprocating sliders 18 stretched out with the help of two springs 19. In this way the cylinder 17 is continuously keeping in tensioning condition the flexible material 10 throughout its endless rotation. |
