| 摘要 |
PURPOSE:To prevent damage to a display lamp and the lowering of the life thereof by arranging an electric circuit for energizing a head lamp and the display lamp for indicating the running out of seedling or the like so that a strong current is fed to the head lamp while a weak current to the display lamp. CONSTITUTION:A switch 35 to a head lamp 31 is OFF during the daytime work. Under such a condition, when seedling runs out, a switch 23b turns ON through a sensor 23a and a weak current is half-wave rectified with a rectifier 34 from a lamp coil 33 runs to a display lamp 30 to flash it. On the other hand, the switch 35 is ON during the night work. Under such a condition, when the seedling runs out, current full-wave rectified with the rectifier 34 are distributed in parallel to the head lamp 31 and the display lamp 30. Thus current which was once strong but weakened by the head lamp 31 flows through the display lamp 30 to turn ON the both the lamps. |
