Device for detecting thickness of sheet-type medium and method thereof

Patent metadata

Field	Value
Publication number	US-9683840-B2
Application number	US-201314353482-A
Country	US
Kind code	B2
Filing date	Apr 1, 2013
Priority date	Jun 11, 2012
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A method and a device for continuously detecting thickness of a sheet-type medium in a continuous conveying process can achieve a more accurate and stable detected thickness value. The device for detecting thickness of a sheet-type medium comprises a conveying roller; a detection roller, the detection roller being arranged opposite to the conveying roller, and an elastic displacement existing between the detection roller and the conveying roller; a plate spring, arranged by pressing opposite to the other side of the detection roller relative to the conveying roller; a sensor, arranged above the plate spring; and a thickness calculation unit, calculating a thickness value of the sheet-type medium according to a distance detection value and a standard zero value; and further comprises a zero value correction unit.

First claim

The invention claimed is:

1. A device for detecting the thickness of a sheet medium, comprising:
a conveying roll, configured to convey a sheet medium;
a detecting roll, arranged opposite to the conveying roll, configured to clamp and convey the sheet medium together with the conveying roll in the process of convey and is elastically displaced relative to the conveying roll;
a sensor, configured to obtain a distance variation value between the detecting roll and the sensor;
a thickness calculating unit, configured to calculate a sheet medium thickness value according to a distance detection value between the detecting roll and the sensor obtained by the sensor when the sheet medium passes by and a standard zero value between the detecting roll and the sensor obtained by the sensor before the sheet medium enters;
wherein the device for detecting the thickness of a sheet medium further comprises:
a zero value correcting unit, configured to correct a dynamic detection zero value between the detecting roll and the sensor obtained by the sensor before the sheet medium enters according to a zero value correcting formula to obtain the standard zero value;
a date storing unit, configured to store a preset distance detection zero value and operating data used by the zero value correcting unit.

2. The device for detecting the thickness of a sheet medium according to claim 1 , wherein the zero value correcting formula is as follow:
b n =(1− t )× b n−1 +t×a n t ε(0,1)

where, a n is a dynamic detection zero value used in detecting the thickness of the n-th sheet medium;
b n represents a standard zero value used in detecting the thickness of the n-th sheet medium;
b n−1 is a standard zero value used in detecting the thickness of (n−1)-th sheet medium;
n is a natural number greater than 0, and when n=1, that is, the detection is performed for the first time, b 0 =A 0 , with A 0 being a preset distance detection zero value.

3. The device for detecting the thickness of a sheet medium according to claim 2 , wherein t ranges from 0.05 to 0.25.

4. The device for detecting the thickness of a sheet medium according to claim 2 , wherein the t is equal to 0.2.

5. The device for detecting the thickness of a sheet medium according to claim 4 , further comprising a sheet medium entry determining module, configured to determine whether sheet medium thickness detection is to be started.

6. The device for detecting the thickness of a sheet medium according to claim 1 , wherein a plate spring is arranged against the detecting roll on the side opposite to the conveying roll to achieve the elastic displacement of the detecting roll relative to the conveying roll.

7. The device for detecting the thickness of a sheet medium according to claim 6 , wherein the sensor is arranged above the plate spring and relatively static to the conveying roll.

8. A method for detecting the thickness of a sheet medium, comprising:
S 1 . obtaining a dynamic detection zero value between a detecting roll and a sensor before a sheet medium enters;
S 2 . correcting the dynamic detection zero value according to a zero value correcting formula to obtain a standard zero value;
S 3 . obtaining a distance detection value between the detecting roll and the sensor when the sheet medium passes through the sensor;
S 4 . calculating the actual thickness value of the sheet medium according to the difference between the distance detection value and the standard zero value.

9. The method for detecting the thickness of a sheet medium according to claim 8 , wherein the zero value correcting formula is as follow:
b n =(1− t )× b n−1 +t×a n t ε(0,1)

where, a n is a dynamic detection zero value used in detecting the thickness of the n-th sheet medium;
b n represents a standard zero value used in detecting the thickness of the n-th sheet medium;
b n−l is a standard zero value used in detecting the thickness of (n−1)-th sheet medium;
n is a natural number greater than 0, and when n=1, that is, the detection is performed for the first time, b 0 =A 0 , with A o being a preset distance detection zero value.

10. The method for detecting the thickness of a sheet medium according to claim 9 , wherein t ranges from 0.05 to 0.25.

11. The method for detecting the thickness of a sheet medium according to claim 9 , wherein the t is equal to 0.2.

12. The device for detecting the thickness of a sheet medium according to claim 3 , wherein the t is equal to 0.2.

13. The method for detecting the thickness of a sheet medium according to claim 10 , wherein the t is equal to 0.2.

Assignees

• Grg Banking Equipment Co Ltd

Inventors

• Luo Panfeng
• Wang Rongqiu
• Xu Chaoyang
• Li Ming

Classifications

• G01B21/08 Primary

  for measuring thickness · CPC title

• G07D7/164

  Thickness · CPC title

• G01B2210/42

  with one or more detectors on a single side of the object to be measured and with a backing surface of support or reference on the other side · CPC title