| 摘要 |
PURPOSE:To enable removable of dust and elimination of waste of battery by providing means for controlling forward/reverse rotation of motor for moving a head lamp and lamp cover up and down and a manual switch for exchanging between forward and reverse rotations. CONSTITUTION:Upon turning on of a manual switch 4, current will flow through Vcc down contact 5a of relay 5 contact 4a of switch 4 up diode D1 relay 8 contact 4b ground to function the reverse rotation relay 8 thus to rotate a motor 9 reversely and to lower the head lamp 2 and head lamp cover 10. Upon turning off of the switch 4, the motor 9 will rotate forward just like turning off of the light switch 1, thus to lower the lamp 2 and cover 10. In such a manner, when moving such as the lamp up and down through the switch 4 the motor 9 is rotated reversely thus to enable removal of dust by lifting the cover 10 through the switch 4 and to prevent waste of battery. |
