| 摘要 |
A drive circuit for dental percussion tools or hammers and the like including a power supply coupled with a timing circuit which provides suitable output pulses of selectable frequency. The output of the timing circuit is connected to a recoil-drive pulse forming circuit which includes one shot multivibrators one of which generates recoil pulses and the other of which generates drive pulses immediately following the recoil pulses. These pulses are amplified and applied to the solenoid of the dental hammer unit to alternately energize coils of the solenoid to cause the armature to reciprocate rapidly and impart repetitive impacts to a tool element. The circuit includes means for enabling adjustment of pulse frequency, pulse width and pulse amplitude.
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