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US 11,897,722 B2Granted
Sheet conveying device
AssigneeToshiba Tec Kabushiki Kaisha
InventorJunya Ohashi
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Abstract
According to an embodiment, a sheet conveying device detects double feeding of sheets by an ultrasonic wave oscillator and an ultrasonic waves receiver provided across a conveying path of the sheets. The sheet conveying device calibrates a threshold voltage on the basis of an offset voltage of an amplifier circuit when the receiver has not received ultrasonic waves.
Claims9
A sheet conveying device, comprising:
- a conveying device that conveys a sheet through a conveying path;
- an oscillator that oscillates ultrasonic waves on the sheet conveyed through the conveying path;
- a receiver that is provided at a position facing the oscillator across the conveying path and receives the ultrasonic waves oscillated from the oscillator;
- an amplifier circuit that amplifies an output signal of the receiver;
- a comparator that compares a voltage of the output signal amplified by the amplifier circuit with a threshold voltage;
- and
- a processor configured to
- detect, on a basis of a comparison result of the comparator, double feeding of sheets conveyed through the conveying path, and
- calibrate the threshold voltage on a basis of an offset voltage of the amplifier circuit where the receiver has not received the ultrasonic waves, wherein
- the processor calibrates the threshold voltage by a binarized output value obtained by comparing the offset voltage of the amplifier circuit, which is input to a first input terminal of the comparator, with the threshold voltage, which is input to a second input terminal of the comparator.
7 more elements
Dependencies are inferred from the claim text.