| 摘要 |
<p>The invention concerns a switching machine of a type comprising a number of trolleys (1) pulled by belts (5) mounted on drive wheels (2) set at the ends of the machine, comprising a mechanism suitable for imposing a counter-rotating motion on the trolleys (1) so as to maintain them in a correct position while passing over the mentioned drive wheels (2), said mechanisms comprising: A number of first sprockets (10) mounted on a support (9) firmly attached to drive wheels (2); For each trolley, a sprocket (12) firmly attached to the frame of the trolley, suitable for meshing with the said first sprockets (10) when the trolley (1) reaches the ends of its path; Means suitable for imposing on the mentioned first sprockets (10) a rotating motion proportional to the rotation of the said drive wheels (2), and having the same direction. <IMAGE></p> |
