| 摘要 |
An electrical feed and control circuit for a drive arrangement of the pump piston of a spray gun which comprises a coil and an oscillating armature, employs an input for connection to an alternating current network, an output leading to the oscillating armature coil, a half-wave suppression circuit optionally connectible by way of a transfer switch, a phase-angle control circuit connectible and disconnectible by the transfer switch in common with the half-wave suppression circuit, the phase-angle circuit including a timing element comprising a fixed resistor and a capacitor, and a second phase-angle circuit -having a timing element containing a variable resistor. In one switch position of the switch, the current path extends through the second phase-angle circuit and in the other switch position extends through the half-wave suppression circuit and the first phase-angle circuit so that the phase-angle is variable in the one switch position whereas, in the other switch position a fixed phase angle is provided and the stroke frequency of the pump piston is cut in half.
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