Patent ID: 11897722
Assignee: TOSHIBA TEC KABUSHIKI KAISHA
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. 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.