| 摘要 |
PURPOSE:To prevent a rear-end collision by dividing a rail for conveying a plurality of running bodies into three sections or more and by stopping a running body coming in a section next to the section, in which another running body exists, through forming a closed circuit between the running body and rail by means of a switching means. CONSTITUTION:An endless rail 1, on which a plurality of running bodies 2-1 to 2-3 run in the direction(a) shown by the arrow, is provided with electric wires 6-8 in addition to various trolley wires 3-5. The running bodies 2-1 to 2-3 are provided with current collectors 9-12 coming in sliding contact with the trolley wires 3-5 and electric wires 6-8 and with a controller 13. The rail 1 and electric wires 6, 8 are divided into zones 1-3 and the electric wire 7 is continuous in all sections. The electric wire 17 connects between wires 6-1 and 8-2. When the running body 2-2 comes in the zone 2 while the running body 2-1 is in the zone 1, a current flows from the controller 13 as shown by the arrow Y and the controller 13 outputs a stop signal so that the running body 2-2 is stopped. Thus, no sensor is used also in the curved part of the rail 1 and a rear-end collision is prevented securely. |
