| 摘要 |
a thermo-sensitive recording paper pressure sensor(17) for detecting the recording paper with the resistivity change depending on the pressure of the paper weight; an amplifier unit(20) for amplifying the output of the sensor; a comparator(30) for comparing the output of the amplifying unit and the reference voltage; an A/D converter(40) for digitizing the analog signal; and a control unit(50) for controlling the sensing of the thermo-sensitive recoding paper and displaying the number of unused papers so as to find the quantity of the recording paper without opening the facsimile.
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