JP2009292549A5

JP2009292549A5 -

Info

Publication number: JP2009292549A5
Application number: JP2008145841A
Authority: JP
Filing date: 2008-06-03
Publication date: 2011-07-21
Anticipated expiration: 2028-06-03

Claims

In a paper transport apparatus comprising double feed detection means composed of ultrasonic wave transmission means and ultrasonic wave reception means arranged at positions facing each other across the paper transport path,
Before SL Ultrasonic said burst wave transmitted from transmitting means receiving wave ultrasonic wave receiving means receives sampled at least three times at different timings, the voltage of the received wave first voltage data, the second voltage data, And detecting means for detecting as the third voltage data;
The difference between the first voltage data and the second voltage data detected by the detection means is greater than or equal to a first predetermined value, and the absolute difference between the second voltage data and the third voltage data And a determining unit that determines a peak of the primary wave in the received wave based on the value being less than a second predetermined value .

2. The sheet according to claim 1 , wherein the determining unit determines the peak of the primary wave when the first to third voltage data detected by the detecting unit is within a predetermined voltage range. Conveying device.

The determining means determines that the abnormality is abnormal when the first to third voltage data detected by the detecting means is not within a predetermined voltage range, and stops determining the peak of the primary wave. The sheet conveying apparatus according to claim 1.

The determining unit is configured such that a difference between the first voltage data and the second voltage data detected by the detecting unit is not equal to or greater than a first predetermined value, or the second voltage data and the third voltage data. 2. The sheet conveying apparatus according to claim 1, wherein when the absolute value of the difference between the first and second differences is not less than a second predetermined value, at least one of sampling timings by the detecting unit is advanced or delayed by a predetermined time.

In a paper transport apparatus comprising double feed detection means composed of ultrasonic wave transmission means and ultrasonic wave reception means arranged at positions facing each other across the paper transport path,
Detecting means for detecting a pre SL voltage data of the received wave burst wave has been received by the ultrasonic wave receiving means is transmitted from the ultrasonic wave transmission means,
Threshold determination means for determining a threshold voltage with reference to a peak voltage of the voltage detected by the detection means ;
Based on the voltage of the received wave detected by the detecting means becomes the threshold voltage timing after the voltage of the received wave detected by the detecting means becomes the peak voltage, the peak of the primary wave in the received wave A paper conveying apparatus comprising a determining means for determining.

Before SL determining means, said detecting predetermined time the earliest time from the timing at which the voltage of the received wave becomes the threshold voltage detected by means after the voltage of the received wave detected by the detecting means becomes the peak voltage 6. The sheet conveying apparatus according to claim 5, wherein the timing is determined as a detection timing of the peak of the primary wave.

In a double feed detection method for a paper transport device comprising a double feed detection means comprising an ultrasonic transmission means and an ultrasonic reception means arranged at positions facing each other across a paper transport path,
Before SL Ultrasonic said burst wave transmitted from transmitting means receiving wave ultrasonic wave receiving means receives sampled at least three times at different timings, the voltage of the received wave first voltage data, the second voltage data, And a detection step of detecting as third voltage data;
The difference between the first voltage data and the second voltage data detected in the detection step is greater than or equal to a first predetermined value, and the absolute difference between the second voltage data and the third voltage data And a determination step of determining a peak of the primary wave in the received wave based on the value being less than a second predetermined value .

In a double feed detection method for a paper transport device comprising a double feed detection means comprising an ultrasonic transmission means and an ultrasonic reception means arranged at positions facing each other across a paper transport path,
A detection step of detecting a pre SL voltage data of the received wave burst wave has been received by the ultrasonic wave receiving means is transmitted from the ultrasonic wave transmission means,
A threshold value determining step for determining a threshold voltage with reference to a peak voltage of the voltage detected in the detection step ;
Based on the timing of the voltage of the received wave detected by the detecting step becomes the threshold voltage after the voltage of the received wave detected by the detecting step becomes the peak voltage, the peak of the primary wave in the received wave And a determining step for determining.