| 摘要 |
A power device for visual care includes a circuit control panel which is fixed to one side having a guide slot of a pneumatic cylinder. The circuit control panel has a notch corresponding in position to the guide slot. The circuit control panel includes a homing sensor, a positive air pressure micro switch and a negative air pressure micro switch which are located close to the notch and respectively correspond to the homing position, the utmost positive air pressure position and the utmost negative air pressure position of the piston unit. The circuit control panel further includes a guide member having an inductive part which has a bent section facing the homing sensor. Accordingly, when the power unit is activated, the power screw drives the piston unit to bring the inductive part of the guide member to the homing sensor for return-to-zero setting and to bring the guide member to touch the positive air pressure micro switch and the negative air pressure micro switch and return to the homing sensor so as to provide proper positive air pressure and negative air pressure for visual care.
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