| 摘要 |
<p>The system has an electric motor (11a) e.g. asynchronous motor, for driving a transmission part e.g. toothed drive belt or chain, which extends over breadth of a rail. Wipers (7, 8) are suspended on wiper carriages (6a, 6b). The wiper carriages are forwardly and rearwardly movable on the breadth of the rail. Another electric motor (11b) is provided for operating another transmission part and corresponds to the electric motor (11a), where trigger circuit is provided with identical frequency converters (13a, 13b) for controlling electric motors.</p> |
