WO2002024561A1 - Document handling apparatus - Google Patents

Document handling apparatus Download PDF

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Publication number
WO2002024561A1
WO2002024561A1 PCT/GB2001/003562 GB0103562W WO0224561A1 WO 2002024561 A1 WO2002024561 A1 WO 2002024561A1 GB 0103562 W GB0103562 W GB 0103562W WO 0224561 A1 WO0224561 A1 WO 0224561A1
Authority
WO
WIPO (PCT)
Prior art keywords
detector
radiation
apparatus according
document
sources
Prior art date
Application number
PCT/GB2001/003562
Other languages
French (fr)
Inventor
Anthony Philip Thompson
Original Assignee
De La Rue International Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB0023223A priority Critical patent/GB0023223D0/en
Priority to GB0023223.1 priority
Application filed by De La Rue International Limited filed Critical De La Rue International Limited
Publication of WO2002024561A1 publication Critical patent/WO2002024561A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/14Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors by photoelectric feelers or detectors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimension; Position; Number; Identification; Occurence
    • B65H2511/20Location in space
    • B65H2511/24Irregularities
    • B65H2511/242Irregularities in orientation, e.g. skew
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimension; Position; Number; Identification; Occurence
    • B65H2511/50Occurence
    • B65H2511/51Presence
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimension; Position; Number; Identification; Occurence
    • B65H2511/50Occurence
    • B65H2511/52Error; Fault
    • B65H2511/524Multiple articles, e.g. double feed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/60Optical characteristics, e.g. colour, light
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00Means for sensing, detecting or otherwise used for control
    • B65H2553/40Means for sensing, detecting or otherwise used for control using optical, e.g. photographic, elements
    • B65H2553/41Photoelectric detectors
    • B65H2553/416Array arrangement, i.e. row of emitters or detectors

Abstract

Document handling apparatus comprises a transport system (1) for transporting documents along a transport path (4). A document detection system has at least two detector arrangements (6, 7), each detector arrangement comprising a linear array (9) of radiation sources or radiation detectors, and at least one radiation detector (10) or radiation source respectively. The sources and detectors (9, 10) are located so that radiation emitted by a radiation source is detected by a corresponding detector after being transmitted through a document on the transport path (4), the two detector arrangements being spaced apart in a direction transverse to the transport direction. A control system (11) selectively controls each detector arrangement to detect different width radiation beams.

Description

DOCUMENT HANDLING APPARATUS

The invention relates to document handling apparatus, for example document sorting, dispensing or accepting apparatus .

It is a common requirement in document handling apparatus to ensure that single documents only are transported and multiple documents or so-called "doubles" are detected. It is also a common requirement, particularly in the case of banknote handling equipment, to provide means for determining the overall length of a document in the transport direction so as to enable the detection of half-length documents and strings of documents . Two technologies have been developed for detecting doubles. In mechanical arrangements, the deflection of a feeler or roller is monitored but this has the drawback that jamming can occur under some circumstances.

In an optical approach, the attenuation of light transmitted through the document is monitored and a double fed document is sensed when the attenuation exceeds a predetermined threshold.

The problem with conventional, optical arrangements is that the degree of attenuation can vary significantly from document to document, particularly where the documents carry varied printing or are soiled (as in the case of banknotes) making it difficult to set an acceptable threshold which accurately detects doubles without rejecting single documents. It is also a common requirement to detect the location of a document being fed along a transport path and this is typically achieved by detecting the presence of the leading edge of the document. This requires the use of a narrow radiation beam. In accordance with the present invention, document handling apparatus comprises a transport system for transporting documents along a transport path, and a document detection system having at least two detector arrangements, each detector arrangement comprising a linear array of radiation sources or radiation detectors, and at least one radiation detector or radiation source respectively, the sources and detectors being located so that radiation emitted by a radiation source is detected by a corresponding detector after being transmitted through a document on the transport path, the two detector arrangements being spaced apart in a direction transverse to the transport direction; and a control system for selectively controlling each detector arrangement to detect different width radiation beams.

With this new invention, we provide two detector arrangements, each arrangement being controllable to detect different width radiation beams. This enables each detector arrangement to be set initially to detect relatively narrow width radiation so as to detect a leading edge of the document and then to be set to detect relatively wide width radiation transmitted through a relatively wide portion of a document for the purpose of detecting doubles. By using a wide width beam area in the second stage and then averaging over a number of samples within the wider width portion of the document, the discrepancies caused by significant and localised document density variations, pattern variations, metal threads, holes and the like are removed. However, the use of a relatively narrow width allows the leading edge of a document to be accurately detected. Further, by providing at least two such detector arrangements, skew can also be determined and thus an accurate determination of document length can be made.

Typically, the linear arrays are rectilinear and in that case, the arrays preferably extend in a direction substantially orthogonal to the transport direction. However, other forms of linear array such as curved linear arrays are possible while the linear array may form part of a larger two-dimensional array. Preferably, the detector arrangements are substantially symmetrically located about a centre line of the transport path. This assists in downstream signal processing when handling a skew fed document . Conveniently, each detector arrangement has the same construction although this is not essential. Thus, in a preferred approach, each detector arrangement comprises a linear array of radiation sources and a single or more than one radiation detector, the sources being controllable so that one or a few of the sources in the linear array are activated to generate the relatively narrow width beam or all the sources are illuminated to generated the relatively wide beam.

Of course, the arrangements may comprise a linear array of detectors and a single source, the detectors being selectively controllable in a similar way to the sources of the previous example .

Preferably, the sources of the detector arrangements are located on the same side of the transport path although in some cases the source (s) of one detector arrangement may be located on the same side of the transport path as the detector (s) of the other detector arrangement.

Typically, the radiation will be visible light although radiation outside the visible wavelength range, for example in the infrared or ultraviolet, could also be used.

As mentioned above, the invention is particularly suited for use with banknote handling apparatus such as banknote dispensers, sorters and acceptors but is equally applicable to other types of document handling apparatus.

An example of a banknote transport apparatus according to the invention will now be described with reference to the accompanying drawings, in which: -

Figure 1 is a schematic, side view of the apparatus; Figure 2 is a block diagram of part of the detection system; and, Figure 3 is a plan view showing the location of the radiation source arrays.

The apparatus shown in Figure 1 comprises a transport system 1 illustrated diagrammatically by a pair of feed belts 2,3 which are operated to transport documents along a feed path 4 in the direction of an arrow 5. Of course, other feed arrangements could be used such as vacuum based systems .

A pair of detector arrangements 6,7 (Figure 3) are located on either side of a centre line 8 of the feed path 4, one of the detector arrangements 6 being shown in Figure 1. The two detector arrangements 6,7 have an identical construction so the detector arrangement 6 will be described. The detector arrangement 6 comprises a rectilinear array of LEDs 9 positioned above the transport path 4 and a single photodiode 10 located below the transport path 4 in alignment with the central LED of the array 9.

The array 9 and the photodiode 10 are connected to a control system 11 which monitors the output of the photodiode 10 and controls a solenoid 12 accordingly. The solenoid 12 is coupled to a diverter 13 which can be moved between its solid line position shown in Figure 1 where banknotes are fed to a dispense outlet 14 and the position shown in dashed lines in which the banknotes are fed to a cull pocket 15.

The control system 11 is shown in more detail in Figure 2. The control system comprises a microprocessor 16 connected to each detector arrangement 6,7. The connections to the detector arrangement 6 are shown in more detail. Thus, the microprocessor 16 is connected to a set of LED drivers 17 which in turn are connected to individual LEDs in the array 9. The photodiode 10 is connected to an analogue-to-digital converter 19 whose output is connected to an input of the microprocessor 16. Similar connections are made to the components of the detector arrangement 7. In operation, the microprocessor 16 activates the central LED only of each array 9, indicated at A in Figure

3. This results in a narrow radiation beam being generated which is detected by the corresponding photodiodes 10. When the leading edge of a banknote 20 cuts one of these beams, the radiation reaching the photodiode will be significantly attenuated and this will be detected by the microprocessor 16 as indicating the arrival of the leading edge 21 of the banknote. As will be apparent from Figure 3, if the banknote 20 is skew fed (as shown) then the leading edge will be detected at different times by the two detector arrangements 6,7 and the difference in timing will provide an indication of the degree of skew assuming the note speed is known.

Once the detector arrangement has detected the leading edge, the microprocessor 16 will turn on all the LEDs in the appropriate array 9 so that a relatively wide strip of the banknote 20 is illuminated. To a first order approximation, the level of transmission through the banknote is an inverse log function of the thickness of the paper and this is monitored by the microprocessor 16 by sampling the output from the photodiodes 10. These samples can then be averaged and translated to a thickness value using a look-up table based on the inverse log function mentioned above. If the determined thickness exceeds a predetermined threshold corresponding to a single note, a double is indicated and the microprocessor 16 will activate the solenoid 12 so that the diverter 13 moves to its dashed line position and the doubles are supplied to the cull pocket 15.

When working with known single denomination currency, the full arrays can be turned on some time after the leading edge is detected and turned off before the trailing edge of the note is reached, thus removing the possibility of saturation degrading the average density reading. The pair of single LED sources A can then be used to detect the overall length of the note. This provides an additional check on the validity of the note being fed as mentioned above .

Although two detector arrangements have been described, more than two could be used. Furthermore, each array could form part of a single much larger array.

Claims

1. Document handling apparatus comprising a transport system for transporting documents along a transport path, and a document detection system having at least two detector arrangements, each detector arrangement comprising a linear array of radiation sources or radiation detectors, and at least one radiation detector or radiation source respectively, the sources and detectors being located so that radiation emitted by a radiation source is detected by a corresponding detector after being transmitted through a document on the transport path, the two detector arrangements being spaced apart in a direction transverse to the transport direction; and a control system for selectively controlling each detector arrangement to detect different width radiation beams.
2. Apparatus according to claim 1, wherein the linear arrays are rectilinear.
3. Apparatus according to claim 2, wherein the linear arrays extend in a direction substantially orthogonal to the transport direction.
4. Apparatus according to any of the preceding claims, wherein the detector arrangements are substantially symmetrically located about a centre line of the transport path.
5. Apparatus according to any of the preceding claims, wherein the detector arrangements have the same construction.
6. Apparatus according to any of the preceding claims, wherein the sources of the detector arrangements are located on the same side of the transport path.
7. Apparatus according to any of the preceding claims, wherein the sources comprise light emitting diodes.
8. Apparatus according to any of the preceding claims, wherein the detectors comprise photodiodes.
9. Banknote handling apparatus according to any of the preceding claims.
PCT/GB2001/003562 2000-09-21 2001-08-07 Document handling apparatus WO2002024561A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0023223A GB0023223D0 (en) 2000-09-21 2000-09-21 Document handling apparatus
GB0023223.1 2000-09-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU7654301A AU7654301A (en) 2000-09-21 2001-08-07 Document handling apparatus

Publications (1)

Publication Number Publication Date
WO2002024561A1 true WO2002024561A1 (en) 2002-03-28

Family

ID=9899901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/003562 WO2002024561A1 (en) 2000-09-21 2001-08-07 Document handling apparatus

Country Status (3)

Country Link
AU (1) AU7654301A (en)
GB (1) GB0023223D0 (en)
WO (1) WO2002024561A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10233052A1 (en) * 2002-07-19 2004-02-05 Giesecke & Devrient Gmbh Multiple document pull-off detection system for a document, especially banknote or check, processing system, whereby the documents are illuminated in their most sensitive areas and the transmitted radiation measured
GB2429767A (en) * 2005-09-06 2007-03-07 Int Currency Tech Banknote output control device that prevents supply of stacked banknotes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492349A1 (en) * 1980-10-17 1982-04-23 Transac Dev Transact Automat Single not checking mechanism for cash dispenser - includes optical source and detectors sensing transparency of note to ensure that only one is dispensed
US4395127A (en) * 1980-09-11 1983-07-26 The United States Of America As Represented By The Secretary Of The Treasury Optical paper detector
US5313886A (en) * 1992-06-06 1994-05-24 Heidelberger Druckmaschinen Ag Electronic method of positioning a register mark sensor of a sheet printing machine
US5329466A (en) * 1991-11-14 1994-07-12 Bobst Sa Registration control device for use in a rotary printing machine
WO1999028226A1 (en) * 1997-11-28 1999-06-10 Diebold, Incorporated Document sensor for currency recycling automated banking machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395127A (en) * 1980-09-11 1983-07-26 The United States Of America As Represented By The Secretary Of The Treasury Optical paper detector
FR2492349A1 (en) * 1980-10-17 1982-04-23 Transac Dev Transact Automat Single not checking mechanism for cash dispenser - includes optical source and detectors sensing transparency of note to ensure that only one is dispensed
US5329466A (en) * 1991-11-14 1994-07-12 Bobst Sa Registration control device for use in a rotary printing machine
US5313886A (en) * 1992-06-06 1994-05-24 Heidelberger Druckmaschinen Ag Electronic method of positioning a register mark sensor of a sheet printing machine
WO1999028226A1 (en) * 1997-11-28 1999-06-10 Diebold, Incorporated Document sensor for currency recycling automated banking machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10233052A1 (en) * 2002-07-19 2004-02-05 Giesecke & Devrient Gmbh Multiple document pull-off detection system for a document, especially banknote or check, processing system, whereby the documents are illuminated in their most sensitive areas and the transmitted radiation measured
GB2429767A (en) * 2005-09-06 2007-03-07 Int Currency Tech Banknote output control device that prevents supply of stacked banknotes
GB2429767B (en) * 2005-09-06 2010-05-12 Int Currency Tech Banknote output control device that prevents supply of stacked banknotes

Also Published As

Publication number Publication date
GB0023223D0 (en) 2000-11-01
AU7654301A (en) 2002-04-02

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