Patent ID: 6157804
Filing Date: 2000-12-05
Classification: G03G

Abstract:
In a xerographic printing system with a photoreceptor which is bearing toner imaging material and an acoustic transducer system for appropriately acoustically vibrating said photoreceptor to assist in the removal of said toner imaging material from said photoreceptor, wherein said acoustic transducer system has an electromechanical transducer with a variable resonant frequency variable within a range of variable resonant frequencies, and wherein said acoustic transducer system has an electrical power driver circuit for driving said electromechanical transducer for said appropriately acoustically vibrating of said photoreceptor to assist in said removal of said toner imaging material from said photoreceptor, the improvement wherein:said electrical power driver circuit provides an automatically variable frequency electrical drive of said electromechanical transducer which includes;a wide band sweep generator for initially sweeping said variable frequency of said variable frequency electrical drive of said electrical power driver circuit over a wide frequency range encompassing said range of variable resonant frequencies of said electromechanical transducer,a resonant frequency detector for detecting when said frequency being swept by said sweep generator passes said resonant frequency of said electromechanical transducer,a switching circuit actuated by said resonant frequency detector;and a control loop circuit connected by said switching circuit to control said variable frequency electrical drive of said electrical power driver circuit to automatically track said variable resonant frequency of said electromechanical transducer.