| 摘要 |
PURPOSE:To perform optionally continuous switching of power sources by providing short rails for switching the power sources and a power source switching unit between two pairs of rails for power supply on which a power supply tool mounting an electronic apparatus is slid, and also providing a tool passage detector to the rails on one side close to the short rails. CONSTITUTION:The power supply tool 1 has a current collecting brush 2 and the electric apparatus 3 is mounted on the tool 1 to receive power supply from the tool 1. The short rails 8, 9 are arranged between the inlet side rails 4, 5 of a training operation process and the outlet side rails 6, 7 of the training operation process and the rails 8, 9 have the length required for mounting one electric apparatus and securing time necessary for an electric test. Power supply switching units 13, 14 are provided with zerocross trigger generating circuits 15, 16, a power supply switching timing circuit 17, interlock circuit 18 oscillation circuit 19, pulse transformers 22, 23, and alteration switches 24-27. A switching timing detector 10 detects the position of the tool 1 to switch power supply sources and the switching is enabled even if the power supply sources are different in voltage, frequency and phase. |
