发明名称
摘要 PURPOSE:To provide an small article load detecting means which is economical, has simple structure, and scarcely generates strange sounds. CONSTITUTION:Voltage waveform generated from a resonance circuit 9 and waveform produced by filtering the voltage waveform is compared by a comparison means 22 and the rectangular waves sent out of the comparison means 22 are counted at the timing corresponding to zero cross points of a. c. voltage waveform and the counted number is compared with a standard value to judge whether there is load or not. In the case there is normal load, the high frequency is high and rectangular waves discontinuous near a zero cross point are sent out of the comparison means 22. In the case there is no load or a small article, high frequency is low and rectangular waves not discontinuous but continuous near a zero cross point are sent out of the comparison means 22. Consequently, whether it is a normal load or no load or a small article can be judged by comparing the counted value with the standard value.
申请公布号 JP3027090(B2) 申请公布日期 2000.03.27
申请号 JP19940164280 申请日期 1994.07.15
申请人 发明人
分类号 H05B6/12;(IPC1-7):H05B6/12 主分类号 H05B6/12
代理机构 代理人
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