| 摘要 |
PURPOSE:To reduce unmatch between mechanical and electric vibrations by providing random pause intervals when alternating current to be fed to piston mechanism will transfer from positive to negative or vice versa. CONSTITUTION:When a pressure sensor detects that the pressure in pressure storage container has dropped below predetermined setting level, an oscillating circuit will receive a signal from pressure sensor to produce a pulse signal. Said signal is provided to a binary counter 47 which will step by 1 count every time when receiving the pulse signal and provide corresponding address signals to ROM48 and pause interval setting circuit 51. In the interval when address signal corresponding to voltage application pause interval is detected, said circuit 51 will provide signals to NOR gates 59 and 60. |
