JPH10258952A - Single and double feed detector for paper sheet and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure a protection ability and a stable carrier capacity in carrying paper sheets by detecting the carrying-directional both end positions of object paper sheets carried along a carrier path, measuring the length of the carrying direction, and comparing it with the measured value of standard paper sheets, and judging the single or double feed of the object paper sheets. SOLUTION: A position detecting means 2 is constituted of a light emitting element and a light receiving element opposed to each other in the top/bottom- directional positions of a carrier path and a standard carrier direction length correspondign to the sensor pass time of standard paper sheets is set and registered in a set part 12 by a switch 15 as single and double feed judgment information. The sensor pass start time and the sensor pass completion time of the object paper sheets carried along the carrier part are measured by a judgment control means 3 and the sensor pass time is calculated from this measured value. After that, the standard carrier direction length registered in the set part 12 and the carrier direction length corresponding to the measured sensor pass time of the object paper sheets are compared so that the single or the double feed of the object paper sheets is judged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for judging single-feed / double-feed of sheets suitable for use in sorting sheets such as mails during transportation.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for judging single-feed / multi-feed of such sheets, Japanese Utility Model Publication No. 2-108947 discloses a "sheet-double feed detecting mechanism". And a measuring mechanism for measuring a change in the length of a sheet before and after the application of the shifting force by the shifting mechanism.

[0003] The determination by the single-feed / multi-feed determining apparatus for paper sheets configured as described above is performed by directly applying a shifting force to the paper sheet being conveyed, and before and after applying the shifting force. This is performed by measuring and comparing the length in the transport direction.

[0004]

However, in the conventional single-feed / multi-feed determining apparatus for paper sheets, single-feed / multi-feed is determined based on the shift amount of the sheets by the shift mechanism. In order to surely shift the fed sheets, a shifting mechanism for applying a large shifting force to the sheets is required.
As a result, there is a problem that the paper sheets are damaged and the protective ability during transportation cannot be guaranteed.

[0005] Further, applying the shifting force directly to the paper sheet hinders the smooth conveyance of the paper sheet, and has a problem that a stable conveyance performance cannot be guaranteed.

[0006] The present invention has been made in view of such circumstances, and it is possible to prevent the occurrence of damage to paper sheets and to perform smooth conveyance of the paper sheets. It is an object of the present invention to provide a single-feed / multi-feed determining apparatus and a method for a sheet, which can guarantee a protective ability during transport and a stable transport ability.

[0007]

According to one aspect of the present invention, there is provided an apparatus for judging single-feed / multi-feed of sheets according to the present invention. And position detecting means for detecting both end positions in the conveying direction of the target sheet, and measuring the conveying direction lengths of the reference sheet and the target sheet connected to the position detecting means and comparing these measured values. It is provided with a judgment control means for judging single-feed / multi-feed of the target sheet based on the information.

According to a second aspect of the present invention, there is provided a method for judging single-feed / multi-feed of a sheet, detecting both end positions in a conveying direction of a reference sheet conveyed along a conveying path, measuring a length in the conveying direction. After detecting both end positions in the conveying direction of the target sheet and measuring the length in the conveying direction, comparing the measured value with the conveying direction length of the reference sheet, based on the comparison information, This is a method of determining single feed / multi feed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a block diagram showing a single-feed / multi-feed determining apparatus for paper sheets according to a first embodiment of the present invention;
FIGS. 2A and 2B are schematic diagrams showing a single-feed / multi-feed determining apparatus for paper sheets according to the first embodiment of the present invention. In FIG. 1, a single-feed / multi-feed determining device for a sheet indicated by reference numeral 1 includes a position detecting means 2 and a determining control means 3.

The position detecting means (position sensor) 2 comprises a light emitting element 4a and a light receiving element 4b, which are opposed to each other at a vertical position of the transport path 5, and is connected to a control unit (described later) of the judgment control means 2. I have. Thereby, paper sheets 1
00 both ends in the transport direction are detected. Further, the position detecting means 2 detects the start of passage of the sheet 100 and the end of passage of the sensor of the sheet 100 together with a timer (described later).

The determination control means 3 is disposed in the middle of the transport path 5 and is connected to the position detection means 2. The determination control means 3 has a built-in timer 6 and A / D converters 7 and 8, a control unit 9, a storage unit 10, an operation unit 11, and a setting unit
2, a comparison unit 13 and a determination unit 14.

The timer 6 is provided in the storage unit 10 of the judgment control unit 3.
And an arithmetic unit 11 via A / D converters 7 and 8, respectively. Accordingly, the sensor passage time of the paper sheet 100 corresponding to the length of the paper sheet 100 in the transport direction is measured. The A / D converters 7 and 8 A / D convert analog amounts corresponding to the sheet 100 at the start and end of the passage of the sheet 100 detected by the position detecting means 2 and the timer 6, respectively. A timing signal from the control unit 9 of the means 3 is output to the storage unit 10 and the arithmetic unit 11.

The control section 9 receives the output signal from the position detecting means 2 and outputs a timing signal, and drives and controls a timer (not shown), each section in the judgment control means 3 and a transport means (not shown). I do.

The storage unit 10 stores the time when the sheet 100 starts passing through the sensor detected by the position detecting means 2 and the timer 6 as time information for measuring the length of the sheet 100 in the transport direction. The calculation unit 11 calculates the sensor passage time corresponding to the length of the paper sheet 100 in the transport direction from the start of the passage of the paper sheet 100 and the end of the passage of the sensor. The setting unit 12 sets the sensor passage time of the sheet (reference sheet) 100 measured in advance by the calculation unit 11 as time information corresponding to the reference transport direction length.

The comparing unit 13 includes time information corresponding to the reference conveying direction length set by the setting unit 12 and time information corresponding to the conveying direction length of the sheet (object sheet) 100 after setting the time information. Compare with The determination unit 14 determines single-feed / multi-feed of the paper sheet (target paper sheet) 100 based on the comparison information in the comparison unit 13.

Reference numeral 15 denotes a switch for registering the reference transport direction length of the paper sheet 100 in the setting unit 12. As a result, the reference conveyance direction length (time information) of the paper sheet (reference paper sheet) 100 can be updated and registered.

Next, in the present embodiment, a single sheet of paper
The double feed determination method will be described with reference to FIGS. First, a single sheet (reference sheet) 100 is conveyed along the conveyance path 5, and the start of passage of the sheet 100 by the sensor is detected by the position detection unit 2 and the timer 6.

That is, as shown in FIG. 1A, a sheet (reference sheet) 1 is placed between the light emitting element 4a and the light receiving element 4b.
When the front end of 00 is shielded from light (detection of the position of one end of the paper sheet 100), the control unit 9 outputs a timing signal to the timer 6, and the timer 6 starts operating. At this time, the storage unit 10
, A signal corresponding to the time when the sheet 100 starts passing through the sensor is stored as time information.

Next, the end of the passage of the sheet (reference sheet) 100 through the sensor is detected by the position detecting means 2 and the timer 6. That is, when the rear end of the paper sheet (reference paper sheet) 100 ends between the light emitting element 4a and the light receiving element 4b and the light shielding is released (the other end position of the paper sheet 100 is detected),
The control unit 9 outputs a timing signal to the storage unit 10, and the operation of the timer 6 ends. At this time, the time information corresponding to the end of the passage of the sheet (reference sheet) 100 by the sensor in the arithmetic unit 11 and the sheet (reference sheet) in the storage unit 10
After calculating the sensor transit time from the time information corresponding to the end of the sensor transit of 100, the reference transport direction length K corresponding to the sensor transit time is set by the switch 13 in the setting unit 10 as single feed / multi feed feed determination information. register.

Then, after the registration of the reference transport direction length K, it is determined whether the paper sheet (target paper sheet) 100 to be transported along the transport path 5 has been transmitted to the sensor and when the sensor has passed the sensor in the same manner as described above. It is measured by the control means 3, and the sensor passage time of the paper sheet (target paper sheet) 100 is calculated from the measured value.

Thereafter, the reference transport direction length K registered in the setting unit 12 is compared with the transport direction length L corresponding to the sensor passage time of the sheet 100 calculated after the registration of the reference transport direction length K. After that, the single-feed / multi-feed of the paper sheet 100 is determined based on the comparison information. That is, K <L
If the paper sheet 100 is “multi-fed”, K =
If it is L, it is determined that “single transmission was performed”. Also, K
If> L, it is determined that “another sheet has been conveyed”, which is different from the target sheet 100.

In this embodiment, the paper sheets 10
Although the case where the length measurement in the transport direction of 0 is performed by the position sensor and the timer has been described, the present invention is not limited to this. It has the same effect as.

[0023]

As described above, according to the present invention, position detecting means for detecting both ends of the reference sheet and the target sheet conveyed along the conveying path in the conveying direction, and the position detecting means And determination control means for measuring the transport direction length of the reference sheet and the target sheet, comparing these measured values, and determining single feed / multi feed of the target sheet based on the comparison information. Because of the provision, the single-feed / multi-feed determination is performed without imparting the sheet sheet shifting force.

Therefore, it is possible to prevent the occurrence of damage to the paper sheets and to smoothly carry the paper sheets, so that the protection ability and the stable transportation ability during the transportation of the paper sheets are guaranteed. be able to

The fact that the reference transport direction length of a sheet is measured by detecting both end positions of the sheet in the transport direction means that the reference transport direction length of many sheets can be set and registered. This is effective when used to determine single feed / multi feed of nonstandard paper.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a single-feed / multi-feed determining apparatus for paper sheets according to a first embodiment of the present invention.

FIGS. 2A and 2B are schematic diagrams showing a single-feed / multi-feed determining apparatus for paper sheets according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single-feed / double-feed determination apparatus 2 Position detection means 3 Judgment control means 5 Transport path 6 Timer 9 Control unit 10 Storage unit 11 Operation unit 12 Setting unit 13 Comparison unit 14 Judgment unit 100 Paper sheet

Claims (2)

[Claims] 1. A position detecting means for detecting both end positions in the conveying direction of a reference sheet and a target sheet conveyed along a conveying path; and a reference sheet and a target sheet connected to the position detecting means. A sheet measuring means for measuring the length of the sheet in the conveying direction, comparing these measured values, and judging single-feed / multi-feed of the target sheet based on the comparison information; Class of single-feed / multi-feed determining device. 2. Detecting both ends of the reference sheet conveyed along the conveying path in the conveying direction, measuring the length in the conveying direction, and detecting both ends of the target sheet in the conveying direction, and detecting the conveying direction. The length of the paper is measured, and the measured value is compared with the length of the reference paper in the transport direction, and then the single-feed / multi-feed of the target paper is determined based on the comparison information. Single feed / double feed judgment method for leaves.