EP3104342B1 - An apparatus for maintaining surface smoothness of a document during high speed processing - Google Patents
An apparatus for maintaining surface smoothness of a document during high speed processing Download PDFInfo
- Publication number
- EP3104342B1 EP3104342B1 EP15171743.6A EP15171743A EP3104342B1 EP 3104342 B1 EP3104342 B1 EP 3104342B1 EP 15171743 A EP15171743 A EP 15171743A EP 3104342 B1 EP3104342 B1 EP 3104342B1
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- EP
- European Patent Office
- Prior art keywords
- document
- suction block
- inspecting plate
- conveyor
- inspecting
- Prior art date
- Legal status (The legal status 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 status listed.)
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- 230000003139 buffering effect Effects 0.000 claims description 13
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- 238000007689 inspection Methods 0.000 description 8
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- 230000032258 transport Effects 0.000 description 4
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- 239000000872 buffer Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/02—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains
- B65H5/021—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts
- B65H5/023—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts between a pair of belts forming a transport nip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/36—Article guides or smoothers, e.g. movable in operation
- B65H5/38—Article guides or smoothers, e.g. movable in operation immovable in operation
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
- G07D11/10—Mechanical details
- G07D11/16—Handling of valuable papers
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/121—Apparatus characterised by sensor details
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
- G07D7/187—Detecting defacement or contamination, e.g. dirt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/447—Moving, forwarding, guiding material transferring material between transport devices
- B65H2301/4474—Pair of cooperating moving elements as rollers, belts forming nip into which material is transported
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/30—Suction means
- B65H2406/32—Suction belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/30—Suction means
- B65H2406/35—Other elements with suction surface, e.g. plate or wall
- B65H2406/351—Other elements with suction surface, e.g. plate or wall facing the surface of the handled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/13—Parts concerned of the handled material
- B65H2701/131—Edges
- B65H2701/1311—Edges leading edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/13—Parts concerned of the handled material
- B65H2701/131—Edges
- B65H2701/1313—Edges trailing edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/19—Specific article or web
- B65H2701/1912—Banknotes, bills and cheques or the like
Definitions
- the invention relates to an apparatus for maintaining surface smoothness of a document during high speed processing.
- Automated, high- volume currency processing is an important technical field affecting numerous aspects of the distribution, collection, and accounting of paper currency.
- Currency processing presents unique labor task issues that are intertwined with security considerations.
- Currency processing requires numerous individual tasks, for example: the collection of single notes by a cashier or bank teller, the accounting of individual commercial deposits or bank teller pay-in accounts, the assimilation and shipment of individual deposits or accounts to a central processing facility, the handling and accounting of a currency shipment after it arrives at a processing facility, and the processing of individual accounts through automated processing machines. Any step in the process that can be automated, thereby eliminating the need for a human labor task, saves both the labor requirements for processing currency and increases the security of the entire process. Security is increased when instituting automated processes by eliminating opportunities for theft, inadvertent loss, or mishandling of currency and increasing accounting accuracy.
- a highly automated, high-volume processing system is essential to numerous levels of currency distribution and collection networks.
- Several designs of high-volume processing machines are available in the prior art and used by such varied interests as national central banks, independent currency transporting companies, currency printing facilities, and individual banks.
- currency processing machines utilize a conveyer system which transports individual notes past a series of detectors.
- banknote sorting and processing consists in detecting properties of the banknote, as for example images of the banknote in order determine their authenticity or fitness. In order to obtain these properties, the banknotes have to be flat during detection/sensing. However, if the banknotes are held between conveyor belts, parts of the banknote are hidden and cannot be analyzed.
- EP 2 081 862 A2 discloses a banknote processing machine that relies on inertia or centrifugal forces for keeping the banknotes flat during inspection.
- a curved document guide is used to generate the inertia/centrifugal force.
- this solution requires too much space.
- JP S54 117635 A discloses a banknote processing device with a first and second suction block arranged on both sides of an inspecting plate of a sensor, wherein the upper surfaces of the suction blocks and the upper surface of the inspection plate are all provided in the same plane.
- an apparatus for a document sorting machine in particular for a banknote sorting machine.
- the invention also provides a document sorting machine, in particular a banknote sorting machine comprising the apparatus.
- the apparatus can also be regarded a module.
- the apparatus or module comprises: a first suction block (or air sucking block), a second suction block (or air sucking block), a first conveyor unit for passing the document to and/or along the first suction block and a second conveyor unit for receiving the document at second suction block and/or passing the document along the second suction block.
- the document while moving through the apparatus has a leading edge and a trailing edge in the direction of movement of the document.
- the apparatus further comprises a sensor unit for determining properties of the document.
- the apparatus can also comprise a processing unit for processing data from the sensor unit.
- the first conveyor unit and the first suction block are arranged on one side of the belt-free gap and the second suction block and the second conveyor unit are arranged on a second side of the belt-free gap (in the direction of the movement of the document). In other words, they are arranged on opposite sides of the belt-free gap (or inspecting plate).
- the belt-free gap is configured to accommodate an inspecting plate of a sensor unit.
- the length of the gap is substantially shorter than the length of the document. This implies that the length of the inspection plate in the direction of the movement of the document is also substantially shorter than the document.
- the air suction blocks create an air flow under beneath the document (between the document guiding surfaces of suction blocks) that serves to suck the documents to the suction blocks. This keeps the document already flat. Furthermore, the air suction blocks also create an air flow in the belt-free gap and in particular between the document guiding surface of the inspecting plate and the document. This air flow towards the first and the second air suction blocks reduces or prevents air buffering in the area of the inspecting plate and keeps the document substantially flat.
- the apparatus also comprises the inspecting plate.
- the inspecting plate is arranged between the first suction block and the second suction block and fill the gap.
- the upper surface of the inspecting plate is configured as a conveyor-free area.
- the sensor unit may then further be configured to detect a property of the document while passing over the inspecting plate.
- suction blocks and the inspecting plate are advantageously arranged such that there is no further gap between them.
- the document can advantageously always be held by at least one of the conveyor units while moving along the belt-free gap and the inspecting plate.
- the conveyor units are arranged outside the gap or, in other words, outside the upper surface and area of the inspecting plate.
- the document can always be driven by at least one of the conveyor units.
- the document is substantially held by the first and the second conveyor unit while moving over the inspecting plate. The document may then be pushed by the first conveyor unit towards the inspection plate and/or pulled by the second conveyor unit away from the inspection plate.
- the first conveyor unit only releases the document when the trailing edge of the document leaves the first suction block and/or when the trailing edge enters the inspecting plate (belt-free gap).
- the second conveyor unit is configured such that it pulls (moves, grabs) the document when the leading edge of the document leaves the inspecting plate (belt-fee gap) and/or when the leading edge of the document enters the second suction block.
- the conveyor units can be of a one-belt, two-belts or three-belts type.
- the document may therefore be moved through the processing machine between two (one-belt type), four (two-belts type) or six (three-belts type) conveyor belts.
- the respective conveyor belt systems are known in the art.
- the upper surfaces (document guiding surfaces) of the first suction block, the second suction block and the inspection plate are in the same flat plane on which the document can move.
- the plane of the upper surface of the first suction block also has a very small inclination with respect to the plane of the upper surface of the inspection plate.
- suction block inspecting plate
- the inspecting plate can be made of various suitable materials as for example metal, steel, glass, and/or ceramics.
- the sensor unit can be any kind of detector of properties or features of the document. It might be a sensor for detecting magnetic properties, or properties of the document like size, authenticity or fitness in general.
- the sensor unit may be an image capture device which is configured to determine whether the document is complete or other properties of the document.
- the sensor unit may also be configured to detect security features on the document. If the sensor unit is an image capture device, the inspecting plate is advantageously transparent.
- the sensor unit may comprise a first (may also be referred to as upper) sensor module and a second (may also be referred to as lower) sensor module.
- the first sensor module and the second sensor module can be arranged on opposite sides of the inspecting plate for sensing a property of the document from both sides. This aspect provides that the document or banknote can be sensed from both sides.
- the first and second sensor module may take an image of the document in at least reflection of one side (or both sides) and/or transmission.
- the first sensor module of the image capture device may comprise a first light source and the second sensor module of the image capture device may comprise a second light source.
- the two light sources are arranged on opposite sides of the inspecting plate. The document or banknote may then be checked in reflection from both sides and in transmission.
- the processing unit may generally be configured to process sensor data from the sensor unit, for example an image of the document received from the sensor unit, and to determine the authenticity and/or soiling and/or fitness of the document based on the sensor data.
- the inspecting plate can be coupled or fixedly coupled or can even form part of the first or second sensor module. If the inspecting plate and the sensor module are coupled to each other as an integral single component, the amount of soil or dust between the inspecting plate and the portion of the sensor unit can be reduced.
- the length of the inspecting plate in the direction of the movement of the document can advantageously be 7 mm to 40 mm.
- the gap when the inspecting plate is absent
- the gap can advantageously be 7 mm to 40 mm. Accordingly, there is a small belt-free gap for accommodating the inspecting plate over which the document or banknote passes. While passing over the gap (inspecting plate), properties can be sensed and/or detected from both side. For example, images can be taken from both sides of the document in reflection, but additionally images can be taken in transmission. This means that many if not all necessary checks of the authenticity and/or fitness of the banknote can be made within a single step.
- a distance between the inspecting plate and the first or second sensor module can be between 2 mm and 12 mm, and advantageously 5 mm to 12 mm. This means that the opening through which the document moves has a limited height. This is possible as the document remains flat and flush on the plate due to the suction blocks.
- the first suction block and the second suction block can comprise through holes through which air is sucked by an underpressure below atmospheric pressure in a range of 0.1 bar to 0.8 bar, in particular 0.3 bar to 0.4 bar.
- the underpressure not only serves to keep the document close to the suction blocks. It also provides that any air buffers between the document and the flat surface of the suction blocks and/or the inspecting plate are prevented.
- the document guiding surfaces of the first suction block, the inspecting plate and the second suction block lie in one plane.
- the surfaces of the three elements, suctions block and inspecting plate can provide one even surface for the document.
- the upper surface of the first suction block is slightly, and only slightly, tilted with respect to the surface of the inspecting plate.
- the angle of inclination of the upper surface of the first suction block may only be 0° to 4°.
- Such a small inclination of the upper document guiding surface of the first suction block can provide an improved aerodynamic effect for the document.
- the risk of air buffering below the banknote is thereby further reduced.
- the angle of inclination has to be kept very small to avoid negative effects when the leading edge of the document gets in contact with the inspecting plate.
- the invention also provides a document or banknote sorting machine including a device in accordance with the aspects and embodiments of the invention.
- An unclaimed example also provides a method of sorting documents, in particular banknotes.
- a document may be passed from a first conveyor unit to a first suction block.
- the first suction block provides an underpressure to the lower surface of the document.
- the document is then passed/pushed to an inspecting plate by the first conveyor unit over the upper surface of the first suction block.
- the document is passed over the inspecting plate while sensing properties of the document by a sensor unit.
- the document is moved over the conveyor-free inspecting plate by either one or both of a first conveyor unit and a second conveyor unit both being arranged outside the area of the inspecting plate.
- the document After having (partially) passed the inspecting plate, the document is received at a second suction block and a second conveyor unit opposite to the first suction block and the first conveyor unit with respect to the inspecting plate. The document is finally passed from the second suction block and the second conveyor unit for further processing the document.
- the document can advantageously be tilted by a predetermined angle with respect to the upper document guiding surface of the inspecting plate before passing it to the inspecting plate. This further decreases air buffering between the document and the upper document guiding surface of the inspecting plate.
- the document or banknote is considered to be a flat sheet of material.
- the document or banknote is also considered to basically define a plane or extend in a single plane. If the document or banknote is described to be tilted, rotated or turned by an angle, this means that the entire plane of the flat document is tilted by the respective angle.
- the angle of tilting or inclination relates to the direction of movement in a sorting machine. With respect to this movement, the document or banknote has a leading edge and a trailing edge.
- the document or banknote is assumed to be flat (in a single plane). The angle of rotation or inclination is then considered to occur around an axis that is parallel to the leading edge and/or trailing edge of the document or banknote.
- the invention generally provides devices for sorting machines for valuable documents, in particular banknotes.
- the invention ensures surface smoothness of the document during quality control by sensor evaluation.
- a belt-free support for the document is provided, along which properties of the document are detected and determined.
- images can be taken from the document in reflection from both sides and in transmission (through the document).
- the document is kept flat on the inspecting plate (for example glass, metal, steel, or ceramics etc.) and is driven by at least one conveyor unit which is arranged outside the inspecting plate (conveyor free area). Underpressure is provided below the document by vacuum suction. However, the respective suction blocks remain outside the inspecting plate.
- the upper document guiding surface of a device along which the document is guided towards the inspecting plate can have a (small) angle of inclination in order to further reduce any risk of air buffering between the document and the inspecting plate. Still further, small steps may be provided between the upper surface of the inspecting plate and the upper surfaces of the suction blocks.
- FIG. 1 is a simplified cross-sectional view of an embodiment of the invention.
- the apparatus comprises an inspecting plate 1 which is arranged between a first suction block 2 and a second suction block 3.
- the apparatus 100 further comprises a first conveyor unit 50 and a second conveyor unit 51 and a sensor unit (for example, image capture device) comprising a first sensor module 21 and a second sensor module 22.
- the document or banknote moves along the direction indicated by the arrow BN.
- the first conveyor unit 50 is only represented in a simplified manner and comprises conveyor belt 12 and rollers 4, and 5 as well as the opposite or complementary conveyor belt 13 and respective rollers 7 and 6.
- the opposite conveyor belt 13 and in particular roller 7 of the first conveyor unit 50 are within the first suction block 2 (illustrated by dashed lines).
- the second conveyor unit 51 is also only represented in a simplified manner and comprises conveyor belt 14 and rollers 9, and 10 as well as the opposite or complementary conveyor belt 15 and respective rollers 8 and 11.
- the opposite conveyor belt 15 and in particular roller 8 of the second conveyor unit 51 are within the second suction block 3 (illustrated by dashed lines).
- the document is initially held and transported between the first conveyor belt 12 and the second (complementary) conveyor belt 13 of the first conveyor unit 50.
- the document After the document has passed with a leading edge the inspecting plate 1 and reaches or passes the second end SE1 of the inspecting plate 1 to reach the second conveyor unit (point H2 between the rollers 9 and 8), the document is also held and transported between the first conveyor belt 14 and the second conveyor belt 15 of the second conveyor unit 51.
- the trailing edge of the document leaves the first conveyor unit 50 and/or reaches or passes the first end of the inspecting plate 1 (point H1 between the rollers 4 and 7 / release point)
- the document is only moved/transported by the second conveyor unit 51.
- the distance between the first end FE1 of the inspecting plate 1 and the touching point/release point H1 of the last complementary rollers 4, 7 of the first conveyor unit 50 can be between 0 and 2 times r, wherein r is the radius of the rollers 4,7.
- the radius r of the rollers in this embodiment is typically 7.5 mm and 12.5 mm.
- the distance between the second end SE1 of the inspecting plate 1 and the touching point/pick-up point H2 of the first complementary rollers 9, 8 of the second conveyor unit 51 can be between 0 and 2 times r, wherein r is the radius of the rollers 9,8.
- the radius r of the rollers in this embodiment is typically 7.5 mm and 12.5 mm.
- the distance X between the release point H1 and the pick-up point H2 can therefore be between the length D1 of the inspecting plate 1 (which is also the length of the belt-free gap) and the length D1 of the inspecting plate 1 plus 4 times r, where r is the radius of the rollers (D1 ⁇ X ⁇ D1+4 ⁇ r).
- first and respective second belts arranged side-by-side (meaning two, four or six conveyor belts all together) dependent on the type of conveyor system.
- Both conveyor units 50 and 51 are only represented in a very simplified manner.
- the document or banknote passes from the first conveyor unit 50 along the first suction block 2.
- the first suction block 2 comprises though holes 18 through which air can be sucked by an underpressure which is created in a suitable suction device 17.
- the second suction block 3 also comprises though holes 18 through which air can be sucked by an underpressure which is created in a suitable suction device 16.
- Suction devices 16 and 17 may of course be a single device.
- the suction blocks 2 and 3 suck the parts of the document down which are not held between the complementary conveyor belts 12, 13 and 14, 15, respectively.
- Another important air flow due to the suction blocks is indicated by arrows A1 and A2.
- the suction blocks 2, 3 also prevent air from buffering between the document and the upper surface (document guiding surface) of the inspecting plate 1.
- the document remains flush on the inspecting plate 1 and the properties of the document can be well sensed. For example, images can be taken in reflection from both sides of the document and in transmission.
- the first and second sensor modules 21, 22 of the sensor unit for example two image capture devices can be configured to sense or detect a property (for example images) of the document while passing over the inspecting plate 1.
- the sensed or detected property for example captured images
- the first sensor module 21 and the second sensor module 22 are arranged on opposite sides of the inspecting plate 1.
- the image capture devices take a picture or scan of both sides of the document in reflection and also one scan or picture in transmission.
- the first sensor module 21 of the image capture device may comprise a first light source and the second sensor module 22 of the image capture device may comprise a second light source.
- the two light sources can be arranged on opposite sides of the inspecting plate 1.
- the first sensor module 21 of the image capture device may also comprise a first image capture unit, for example a camera or scanner, and the second sensor module 22 of the image capture device may comprise a second image capture unit, for example a camera or a scanner.
- the two light sources can be arranged on opposite sides of the inspecting plate 1.
- the document or banknote may then be checked in reflection from both sides and in transmission.
- the processing unit 70 can be configured to process any sensor data, for example an image, of the document received from the sensor modules 21, 22 and to determine the authenticity and/or soiling and/or fitness of the document.
- the inspecting plate 1 can be coupled (or fixedly coupled) or can even form part of the first or second sensor module. If the inspecting plate 1 and one of the sensor modules 21, 22 are coupled to each other as an integral single component, the amount of soil or dust between the inspecting plate 1 and the portion of the sensor modules 21, 22 can be reduced. In this embodiment, the inspecting plate 1 forms part of the second sensor module 22.
- the length D1 of the inspecting plate 1 in the direction BN of the movement of the document can advantageously be 7 mm to 40 mm.
- the first suction block 2 and the second suction block 3 comprise through holes 18 through which air is sucked by an underpressure below atmospheric pressure in a range of 0.1 bar to 0.8 bar, in particular 0.3 bar to 0.4 bar.
- the underpressure not only serves to keep the document close to the suction blocks 2, 3 (outside the conveyor belts). It also provides that any air buffers between the document and the flat upper surface of the suction blocks 2, 3 and/or the inspecting plate 1 are prevented.
- the volume of sucked air is advantageously in relation to the amount of underpressure.
- the volume may be in the range from 1 m 3 to 100 m 3 per hour.
- the volume of the sucked air can be a function of the amount of underpressure.
- the volume of sucked air can be determined as a function (or in relation to) the size (for example diameter) of the holes 18.
- the holes 18 may have a diameter in the range of 0.5 mm to 2 mm, in particular, the holes 18 may have a diameter of 1.2 mm.
- the volume of sucked air and/or the amount of underpressure can also be a function of the number per area or density of the holes 18.
- the holes 18 may be arranged in a regular grid. The distance of the holes 18 may then be in the range of 1 mm to 20 mm, and in particular 5 mm.
- the document guiding surfaces of the first suction block 2, the inspecting plate 1 and the second suction block 3 lie in one plane.
- the surfaces of the three elements, suctions blocks 2, 3 and inspecting plate 1 can provide one even guiding surface for the document.
- the upper surface of the first suction block 2 can also be slightly tilted with respect to the surface of the inspecting plate 1.
- the angle of inclination of the upper surface of the first suction block 2 with respect to the document guiding surfaces of the inspecting plate 1 and/or the second suction block 3 may only be 0° to 4°, i.e. the angle may have a maximum of 4°.
- Such a small inclination of the upper document guiding surface of the first suction block 2 can provide an improved aerodynamic effect for the document. The risk of air buffering below the banknote is thereby further reduced.
- the angle of inclination has to be kept very small to avoid negative effects when the leading edge of the document gets in contact with the inspecting plate 1.
- the distance D2 between the upper document guiding surface of the inspecting plate 1 and the surface of the first sensor module 21 can be 2 mm to 12 mm.
- the speed of the documents or banknotes in moving direction BN can be about 8 m/s or faster (an advantageous value is also 10 m/s).
- the inspecting plate 1 can be made of any smooth (and transparent) material, as for example glass, metal, steel or ceramics.
- FIG. 2 is a simplified top view on the embodiment of FIG. 1 .
- the document moves in the direction indicated by the arrow BN (from right to left).
- the respective belts 12, 14 hold the document.
- the document in particular a banknote can have a width between 50 mm and 90 mm.
- the suction blocks 2, 3 can have a width of 110 mm.
- the conveyor units 50, 51 advantageously end before the inspecting plate 1.
- the last roller 4 of the first conveyor unit 50 is arranged such that document is only released from the conveyor belt 12 when the trailing edge of the document leaves the first suction block 2 (or the previously described touching point/release point H1, see FIG. 1 ).
- the first roller 9 of the second conveyor unit 51 is arranged such that document is grabbed by the conveyor belt 14 when the leading edge of the document leaves the inspecting plate and/or arrives at the second suction block 3 (or the previously described touching point/pick-up point H2, see FIG. 1 ).
- the rollers 9 and 4 are arranged as close as possible to the inspecting plate 1 but still outside the inspecting area of the inspecting plate 1. There are advantageously no holes 18 between the end of the rollers 4, 9 and/or the touching or holding points H1 (also release point), H2 (also pick-up point) as shown in FIG. 1 and the opposite ends FE1, SE1 of the inspecting plate 1. However, there can advantageously be holes 18 in the suction blocks which do not have a greater distance from the respective outer edges of the inspection plate 1 than 1 cm, in particular 0.5 cm.
- the through holes 18 in the suction blocks 2, 3 may be evenly distributed over the entire upper surface of the suction blocks 2, 3. They may be arranged in a regular orthogonal grid. However, other arrangements are also possible.
- the inspecting plate 1 does not have through holes. The inspecting plate 1 is closed and firmly sealed against soil and/or dust.
- the lower or complementary conveyor belt 13 of the first conveyor unit 50 is not shown, but divides the first suction block 2 in an upper part UP2 (first part) and a lower part LW2 (second) on each side of the conveyor belt 13.
- the lower or complementary conveyor belt 15 of the second conveyor unit 51 is not shown, but also divides the second suction block 3 in an upper part UP3 (first part) and a lower part LW3 (second part) on each side of the conveyor belt 15.
- other more complex embodiments may even use suction holes in the conveyor belts.
- FIG. 3A, 3B and 3C are simplified cross-sectional side views on possible details of the embodiments of the invention.
- the upper surfaces O2, O1 and O3 of the first suction block 2, the inspecting plate 1 and the second suction block 3 serve as the document guiding surfaces for the document DOC, which can be a banknote.
- the document moves in the direction indicated by the arrow BN (from right to left).
- the three upper surfaces O1 to O3 of the inspecting plate 1 and the two suction blocks 2, 3 are all on the same level and provide a smooth and flat document guiding surface.
- Air is sucked through holes 18 which are provided in the two suction blocks 2, 3.
- the air flows indicated by arrows A1 and A2 provide that air buffering between the document DOC and the upper air guiding surfaces O1, O2 and O3 is prevented.
- the document DOC has a forward momentum provided by the first conveyor unit 50 which is not shown.
- the upper surface O2 (plane of the surface) of the first suction block 2 is slightly tilted with respect to the upper surface (plane of the surface) of the inspecting plate 1 by an angle ⁇ .
- This angle should be very small and not be greater than 4°.
- This angle provides that the document DOC is slightly tilted with respect to the upper surface O1 of the inspecting plate.
- the tilting or slight rotation of the plane of the document DOC provides that the document DOC is pressed to the inspecting plate 1 and air buffering between the document DOC and the inspecting plate is reduced or prevented.
- steps S1, S2 may also be small steps S1, S2 between the upper surfaces O1, O2, O3 of the first suction block, the inspecting plate and the second suction block.
- These small steps S1, S2 may have a height of up to 0.3 mm. This can further reduce the risk of air buffering below the document DOC.
- the sensor unit in particular the sensor modules 21, 22 are advantageously independent from the suction blocks 2, 3.
- the suction blocks 21, 22 and the conveyor units 50 are advantageously part of the general transport system of the document processing/sorting machine.
- the sensor modules 21, 22 are then fitted into the gap between the suction blocks 2, 3.
- the second sensor module 22 advantageously includes the inspecting plate 1.
- FIG. 4 is a simplified block diagram of a document sorting/processing machine 200 according to an embodiment.
- the document sorting/processing machine 200 (or paper currency processing apparatus) comprises the apparatus 100 according the herein described aspects and embodiments.
- the machine 200 is generally configured to process documents, for example paper currency (banknotes).
- the machine may comprise a supply section 301 in which a large number of documents/banknotes can be placed (stacked).
- There is also a pick-up stage 302 which is configured to pick up the documents from the supply section 301.
- the documents are then transferred on a transfer path 303 comprising a plurality of endless conveyor units (not shown).
- the documents are transferred (moved, transported) by the conveyor units by holding the documents between conveyor belts.
- the documents are transferred to a general auditing device 303 one by one.
- the auditing device 303 may comprise various stages among which the apparatus 100 according to the embodiments and aspects of the invention may be located.
- the auditing device 303 may generally be configured to perform one or more of the following tasks: determining the denomination, shape thickness, top/back genuineness, normality or defacement and the like. Some or all of these tasks may then be performed by and in the apparatus 100 according to the aspects and embodiments of the invention.
- the documents/banknotes are either rejected and transferred to a rejection stage 304 or approved and transferred to section 305 for being re-circulated.
- the apparatus 100 provides, among others, a fitness sensor (sensor unit), for example including a camera system having a clear view to the document from both sides (reflection) and in transmission without disturbing elements like belts or support fences.
- a fitness sensor sensor unit
- the belt-free gap in the transport system does not increase the jam-rate in that particular part of the transport system.
- the length of the belt-free gap or length of the inspecting plate 1 in the direction of the movement of the document is kept very small. It may range up to 40 mm, and advantageously ranges from 7 mm to 40 mm, while 7 mm is also an advantageous value.
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Description
- The invention relates to an apparatus for maintaining surface smoothness of a document during high speed processing.
- Automated, high- volume currency processing is an important technical field affecting numerous aspects of the distribution, collection, and accounting of paper currency. Currency processing presents unique labor task issues that are intertwined with security considerations. Currency processing requires numerous individual tasks, for example: the collection of single notes by a cashier or bank teller, the accounting of individual commercial deposits or bank teller pay-in accounts, the assimilation and shipment of individual deposits or accounts to a central processing facility, the handling and accounting of a currency shipment after it arrives at a processing facility, and the processing of individual accounts through automated processing machines. Any step in the process that can be automated, thereby eliminating the need for a human labor task, saves both the labor requirements for processing currency and increases the security of the entire process. Security is increased when instituting automated processes by eliminating opportunities for theft, inadvertent loss, or mishandling of currency and increasing accounting accuracy.
- A highly automated, high-volume processing system is essential to numerous levels of currency distribution and collection networks. Several designs of high-volume processing machines are available in the prior art and used by such varied interests as national central banks, independent currency transporting companies, currency printing facilities, and individual banks. In general, currency processing machines utilize a conveyer system which transports individual notes past a series of detectors.
- One of the major challenges in high-volume banknote sorting and processing consists in detecting properties of the banknote, as for example images of the banknote in order determine their authenticity or fitness. In order to obtain these properties, the banknotes have to be flat during detection/sensing. However, if the banknotes are held between conveyor belts, parts of the banknote are hidden and cannot be analyzed.
- Various concepts have been developed in order to keep the banknotes flat without conveyor belts. In one of these concepts, the conveyor belts are omitted on one side while the banknote is sucked to the opposite conveyor or a plate. This, however, allows only taking images from one side of the banknote.
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EP 2 081 862 A2 discloses a banknote processing machine that relies on inertia or centrifugal forces for keeping the banknotes flat during inspection. A curved document guide is used to generate the inertia/centrifugal force. However, this solution requires too much space. -
JP S54 117635 A - It is an object of the present invention to provide an apparatus for a valuable or security document or banknote processing machine having reduced size and costs.
- According to an aspect, an apparatus for a document sorting machine, in particular for a banknote sorting machine is provided. The invention also provides a document sorting machine, in particular a banknote sorting machine comprising the apparatus. The apparatus can also be regarded a module.
- The apparatus or module comprises: a first suction block (or air sucking block), a second suction block (or air sucking block), a first conveyor unit for passing the document to and/or along the first suction block and a second conveyor unit for receiving the document at second suction block and/or passing the document along the second suction block.
- As per definition, the document, while moving through the apparatus has a leading edge and a trailing edge in the direction of movement of the document.
- The apparatus further comprises a sensor unit for determining properties of the document.
- The apparatus can also comprise a processing unit for processing data from the sensor unit.
- There is a belt-free gap between the first suction block and the second suction block. The first conveyor unit and the first suction block are arranged on one side of the belt-free gap and the second suction block and the second conveyor unit are arranged on a second side of the belt-free gap (in the direction of the movement of the document). In other words, they are arranged on opposite sides of the belt-free gap (or inspecting plate).
- The belt-free gap is configured to accommodate an inspecting plate of a sensor unit. The length of the gap is substantially shorter than the length of the document. This implies that the length of the inspection plate in the direction of the movement of the document is also substantially shorter than the document.
- The air suction blocks create an air flow under beneath the document (between the document guiding surfaces of suction blocks) that serves to suck the documents to the suction blocks. This keeps the document already flat. Furthermore, the air suction blocks also create an air flow in the belt-free gap and in particular between the document guiding surface of the inspecting plate and the document. This air flow towards the first and the second air suction blocks reduces or prevents air buffering in the area of the inspecting plate and keeps the document substantially flat.
- The apparatus also comprises the inspecting plate. The inspecting plate is arranged between the first suction block and the second suction block and fill the gap. The upper surface of the inspecting plate is configured as a conveyor-free area. The sensor unit may then further be configured to detect a property of the document while passing over the inspecting plate.
- The suction blocks and the inspecting plate are advantageously arranged such that there is no further gap between them.
- The document can advantageously always be held by at least one of the conveyor units while moving along the belt-free gap and the inspecting plate. The conveyor units are arranged outside the gap or, in other words, outside the upper surface and area of the inspecting plate. The document can always be driven by at least one of the conveyor units. In an aspect, the document is substantially held by the first and the second conveyor unit while moving over the inspecting plate. The document may then be pushed by the first conveyor unit towards the inspection plate and/or pulled by the second conveyor unit away from the inspection plate.
- The first conveyor unit only releases the document when the trailing edge of the document leaves the first suction block and/or when the trailing edge enters the inspecting plate (belt-free gap). The second conveyor unit is configured such that it pulls (moves, grabs) the document when the leading edge of the document leaves the inspecting plate (belt-fee gap) and/or when the leading edge of the document enters the second suction block.
- The conveyor units (first and/or second conveyor unit) can be of a one-belt, two-belts or three-belts type. The document may therefore be moved through the processing machine between two (one-belt type), four (two-belts type) or six (three-belts type) conveyor belts. The respective conveyor belt systems are known in the art.
- In an example which is not according to the invention, the upper surfaces (document guiding surfaces) of the first suction block, the second suction block and the inspection plate are in the same flat plane on which the document can move.
- According to the invention the plane of the upper surface of the first suction block also has a very small inclination with respect to the plane of the upper surface of the inspection plate.
- The previous aspects support that the document remains flush on the inspecting plate. Once the document is released from any conveyor unit, an air buffer will built up between the document and the upper surface of any plate or block (suction block, inspecting plate) on which the document is supposed to move. The effect of the suction blocks is that an air buffering between the document and the upper surface of the inspecting plate is reduced or even prevented and the surface smoothness of the document during quality control by the sensor unit is maintained.
- Dependent on the type of the sensor unit, the inspecting plate can be made of various suitable materials as for example metal, steel, glass, and/or ceramics.
- The sensor unit can be any kind of detector of properties or features of the document. It might be a sensor for detecting magnetic properties, or properties of the document like size, authenticity or fitness in general. In an embodiment, the sensor unit may be an image capture device which is configured to determine whether the document is complete or other properties of the document. The sensor unit may also be configured to detect security features on the document. If the sensor unit is an image capture device, the inspecting plate is advantageously transparent.
- The sensor unit may comprise a first (may also be referred to as upper) sensor module and a second (may also be referred to as lower) sensor module. The first sensor module and the second sensor module can be arranged on opposite sides of the inspecting plate for sensing a property of the document from both sides. This aspect provides that the document or banknote can be sensed from both sides.
- If the sensor unit is an image capture device, the first and second sensor module may take an image of the document in at least reflection of one side (or both sides) and/or transmission.
- In case of an image capture device, the first sensor module of the image capture device may comprise a first light source and the second sensor module of the image capture device may comprise a second light source. The two light sources are arranged on opposite sides of the inspecting plate. The document or banknote may then be checked in reflection from both sides and in transmission.
- The processing unit may generally be configured to process sensor data from the sensor unit, for example an image of the document received from the sensor unit, and to determine the authenticity and/or soiling and/or fitness of the document based on the sensor data.
- In an advantageous embodiment, the inspecting plate can be coupled or fixedly coupled or can even form part of the first or second sensor module. If the inspecting plate and the sensor module are coupled to each other as an integral single component, the amount of soil or dust between the inspecting plate and the portion of the sensor unit can be reduced.
- The length of the inspecting plate in the direction of the movement of the document can advantageously be 7 mm to 40 mm. This means also that the gap (when the inspecting plate is absent) can advantageously be 7 mm to 40 mm. Accordingly, there is a small belt-free gap for accommodating the inspecting plate over which the document or banknote passes. While passing over the gap (inspecting plate), properties can be sensed and/or detected from both side. For example, images can be taken from both sides of the document in reflection, but additionally images can be taken in transmission. This means that many if not all necessary checks of the authenticity and/or fitness of the banknote can be made within a single step.
- Advantageously, a distance between the inspecting plate and the first or second sensor module can be between 2 mm and 12 mm, and advantageously 5 mm to 12 mm. This means that the opening through which the document moves has a limited height. This is possible as the document remains flat and flush on the plate due to the suction blocks.
- The first suction block and the second suction block can comprise through holes through which air is sucked by an underpressure below atmospheric pressure in a range of 0.1 bar to 0.8 bar, in particular 0.3 bar to 0.4 bar. The underpressure not only serves to keep the document close to the suction blocks. It also provides that any air buffers between the document and the flat surface of the suction blocks and/or the inspecting plate are prevented.
- In an example which is not according to the invention the document guiding surfaces of the first suction block, the inspecting plate and the second suction block lie in one plane. In other words, the surfaces of the three elements, suctions block and inspecting plate can provide one even surface for the document.
- According to the invention, the upper surface of the first suction block is slightly, and only slightly, tilted with respect to the surface of the inspecting plate. The angle of inclination of the upper surface of the first suction block may only be 0° to 4°. Such a small inclination of the upper document guiding surface of the first suction block can provide an improved aerodynamic effect for the document. The risk of air buffering below the banknote is thereby further reduced. The angle of inclination has to be kept very small to avoid negative effects when the leading edge of the document gets in contact with the inspecting plate.
- There may also be small steps between the upper surfaces of the first suction block, the inspecting plate and the second suction block. These small steps may have a height of up to 0.3 mm. This further reduces the risk of air buffering below the banknote.
- The invention also provides a document or banknote sorting machine including a device in accordance with the aspects and embodiments of the invention.
- An unclaimed example also provides a method of sorting documents, in particular banknotes. A document may be passed from a first conveyor unit to a first suction block. The first suction block provides an underpressure to the lower surface of the document. The document is then passed/pushed to an inspecting plate by the first conveyor unit over the upper surface of the first suction block. The document is passed over the inspecting plate while sensing properties of the document by a sensor unit. The document is moved over the conveyor-free inspecting plate by either one or both of a first conveyor unit and a second conveyor unit both being arranged outside the area of the inspecting plate. After having (partially) passed the inspecting plate, the document is received at a second suction block and a second conveyor unit opposite to the first suction block and the first conveyor unit with respect to the inspecting plate. The document is finally passed from the second suction block and the second conveyor unit for further processing the document.
- The document can advantageously be tilted by a predetermined angle with respect to the upper document guiding surface of the inspecting plate before passing it to the inspecting plate. This further decreases air buffering between the document and the upper document guiding surface of the inspecting plate.
- In the context of this description, the document or banknote is considered to be a flat sheet of material. The document or banknote is also considered to basically define a plane or extend in a single plane. If the document or banknote is described to be tilted, rotated or turned by an angle, this means that the entire plane of the flat document is tilted by the respective angle. Furthermore, the angle of tilting or inclination relates to the direction of movement in a sorting machine. With respect to this movement, the document or banknote has a leading edge and a trailing edge. The document or banknote is assumed to be flat (in a single plane). The angle of rotation or inclination is then considered to occur around an axis that is parallel to the leading edge and/or trailing edge of the document or banknote.
- The invention generally provides devices for sorting machines for valuable documents, in particular banknotes. The invention ensures surface smoothness of the document during quality control by sensor evaluation. A belt-free support for the document is provided, along which properties of the document are detected and determined. In case of an image capture device, images (be it by any kind of camera or scanning device) can be taken from the document in reflection from both sides and in transmission (through the document). The document is kept flat on the inspecting plate (for example glass, metal, steel, or ceramics etc.) and is driven by at least one conveyor unit which is arranged outside the inspecting plate (conveyor free area). Underpressure is provided below the document by vacuum suction. However, the respective suction blocks remain outside the inspecting plate. Furthermore, the upper document guiding surface of a device along which the document is guided towards the inspecting plate can have a (small) angle of inclination in order to further reduce any risk of air buffering between the document and the inspecting plate. Still further, small steps may be provided between the upper surface of the inspecting plate and the upper surfaces of the suction blocks.
- Further aspects, characteristics and advantages of the invention will ensue from the following description of the embodiments with reference to the accompanying drawings, wherein
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FIG. 1 is a simplified cross-sectional view of an embodiment of the invention, -
FIG. 2 is a simplified top view on the embodiment ofFIG. 1 , -
FIG. 3A-C are simplified cross-sectional side views on possible details of the embodiments shown inFIG. 1 andFIG. 2 , and -
FIG. 4 is a simplified block diagram of a document processing and/or sorting machine according to an embodiment. -
FIG. 1 is a simplified cross-sectional view of an embodiment of the invention. There is a module orapparatus 100 for a document or banknote sorting machine. The apparatus comprises an inspectingplate 1 which is arranged between afirst suction block 2 and asecond suction block 3. Theapparatus 100 further comprises afirst conveyor unit 50 and asecond conveyor unit 51 and a sensor unit (for example, image capture device) comprising afirst sensor module 21 and asecond sensor module 22. The document or banknote moves along the direction indicated by the arrow BN. Thefirst conveyor unit 50 is only represented in a simplified manner and comprisesconveyor belt 12 androllers complementary conveyor belt 13 andrespective rollers 7 and 6. Theopposite conveyor belt 13 and inparticular roller 7 of thefirst conveyor unit 50 are within the first suction block 2 (illustrated by dashed lines). Thesecond conveyor unit 51 is also only represented in a simplified manner and comprisesconveyor belt 14 androllers complementary conveyor belt 15 andrespective rollers 8 and 11. Theopposite conveyor belt 15 and in particular roller 8 of thesecond conveyor unit 51 are within the second suction block 3 (illustrated by dashed lines). The document is initially held and transported between thefirst conveyor belt 12 and the second (complementary)conveyor belt 13 of thefirst conveyor unit 50. After the document has passed with a leading edge the inspectingplate 1 and reaches or passes the second end SE1 of the inspectingplate 1 to reach the second conveyor unit (point H2 between therollers 9 and 8), the document is also held and transported between thefirst conveyor belt 14 and thesecond conveyor belt 15 of thesecond conveyor unit 51. When the trailing edge of the document leaves thefirst conveyor unit 50 and/or reaches or passes the first end of the inspecting plate 1 (point H1 between therollers second conveyor unit 51. - The distance between the first end FE1 of the inspecting
plate 1 and the touching point/release point H1 of the lastcomplementary rollers first conveyor unit 50 can be between 0 and 2 times r, wherein r is the radius of therollers - The distance between the second end SE1 of the inspecting
plate 1 and the touching point/pick-up point H2 of the firstcomplementary rollers 9, 8 of thesecond conveyor unit 51 can be between 0 and 2 times r, wherein r is the radius of therollers 9,8. The radius r of the rollers in this embodiment is typically 7.5 mm and 12.5 mm. - The distance X between the release point H1 and the pick-up point H2 can therefore be between the length D1 of the inspecting plate 1 (which is also the length of the belt-free gap) and the length D1 of the inspecting
plate 1 plus 4 times r, where r is the radius of the rollers (D1 ≤ X ≤ D1+4∗r). - There can be one two or three first and respective second belts arranged side-by-side (meaning two, four or six conveyor belts all together) dependent on the type of conveyor system.
- Both
conveyor units first conveyor unit 50 along thefirst suction block 2. Thefirst suction block 2 comprises thoughholes 18 through which air can be sucked by an underpressure which is created in asuitable suction device 17. Thesecond suction block 3 also comprises thoughholes 18 through which air can be sucked by an underpressure which is created in asuitable suction device 16.Suction devices - The suction blocks 2 and 3 suck the parts of the document down which are not held between the
complementary conveyor belts plate 1. As a consequence, the document remains flush on the inspectingplate 1 and the properties of the document can be well sensed. For example, images can be taken in reflection from both sides of the document and in transmission. - Accordingly, the first and
second sensor modules plate 1. The sensed or detected property (for example captured images) may then be further processed and evaluated in aprocessing unit 70. - The
first sensor module 21 and thesecond sensor module 22 are arranged on opposite sides of the inspectingplate 1. In case of image capture devices, the image capture devices take a picture or scan of both sides of the document in reflection and also one scan or picture in transmission. - In case of an image capture device, the
first sensor module 21 of the image capture device may comprise a first light source and thesecond sensor module 22 of the image capture device may comprise a second light source. The two light sources can be arranged on opposite sides of the inspectingplate 1. Thefirst sensor module 21 of the image capture device may also comprise a first image capture unit, for example a camera or scanner, and thesecond sensor module 22 of the image capture device may comprise a second image capture unit, for example a camera or a scanner. The two light sources can be arranged on opposite sides of the inspectingplate 1. The document or banknote may then be checked in reflection from both sides and in transmission. - The
processing unit 70 can be configured to process any sensor data, for example an image, of the document received from thesensor modules - In an advantageous embodiment, the inspecting
plate 1 can be coupled (or fixedly coupled) or can even form part of the first or second sensor module. If the inspectingplate 1 and one of thesensor modules plate 1 and the portion of thesensor modules plate 1 forms part of thesecond sensor module 22. - The length D1 of the inspecting
plate 1 in the direction BN of the movement of the document can advantageously be 7 mm to 40 mm. There is a small belt-free gap formed by the inspectingplate 1 over which the banknote passes. While passing over the belt-free gap, i.e. over the inspectingplate 1, sensor data, as for example images can be taken from both sides of the document in reflection and also in transmission. Dependent on the type of the sensor unit, other properties of the document may be determined. This means that many or all necessary checks of the authenticity and/or fitness of the banknote can be made within a single step. - The
first suction block 2 and thesecond suction block 3 comprise throughholes 18 through which air is sucked by an underpressure below atmospheric pressure in a range of 0.1 bar to 0.8 bar, in particular 0.3 bar to 0.4 bar. The underpressure not only serves to keep the document close to the suction blocks 2, 3 (outside the conveyor belts). It also provides that any air buffers between the document and the flat upper surface of the suction blocks 2, 3 and/or the inspectingplate 1 are prevented. - The volume of sucked air is advantageously in relation to the amount of underpressure. The volume may be in the range from 1 m3 to 100 m3 per hour.
- The volume of the sucked air can be a function of the amount of underpressure. The volume of sucked air can be determined as a function (or in relation to) the size (for example diameter) of the
holes 18. Theholes 18 may have a diameter in the range of 0.5 mm to 2 mm, in particular, theholes 18 may have a diameter of 1.2 mm. The volume of sucked air and/or the amount of underpressure can also be a function of the number per area or density of theholes 18. Theholes 18 may be arranged in a regular grid. The distance of theholes 18 may then be in the range of 1 mm to 20 mm, and in particular 5 mm. - In an unclaimed example, the document guiding surfaces of the
first suction block 2, the inspectingplate 1 and thesecond suction block 3 lie in one plane. In other words, the surfaces of the three elements, suctionsblocks plate 1 can provide one even guiding surface for the document. - However, according to the invention, the upper surface of the
first suction block 2 can also be slightly tilted with respect to the surface of the inspectingplate 1. The angle of inclination of the upper surface of thefirst suction block 2 with respect to the document guiding surfaces of the inspectingplate 1 and/or thesecond suction block 3 may only be 0° to 4°, i.e. the angle may have a maximum of 4°. Such a small inclination of the upper document guiding surface of thefirst suction block 2 can provide an improved aerodynamic effect for the document. The risk of air buffering below the banknote is thereby further reduced. The angle of inclination has to be kept very small to avoid negative effects when the leading edge of the document gets in contact with the inspectingplate 1. - The distance D2 between the upper document guiding surface of the inspecting
plate 1 and the surface of thefirst sensor module 21 can be 2 mm to 12 mm. - The speed of the documents or banknotes in moving direction BN can be about 8 m/s or faster (an advantageous value is also 10 m/s).
- The inspecting
plate 1 can be made of any smooth (and transparent) material, as for example glass, metal, steel or ceramics. -
FIG. 2 is a simplified top view on the embodiment ofFIG. 1 . The document moves in the direction indicated by the arrow BN (from right to left). There is only oneconveyor belt conveyor unit respective belts holes 18 may not be covered when the document has a smaller width. - From this perspective, it becomes apparent that the
conveyor units plate 1. Thelast roller 4 of thefirst conveyor unit 50 is arranged such that document is only released from theconveyor belt 12 when the trailing edge of the document leaves the first suction block 2 (or the previously described touching point/release point H1, seeFIG. 1 ). Thefirst roller 9 of thesecond conveyor unit 51 is arranged such that document is grabbed by theconveyor belt 14 when the leading edge of the document leaves the inspecting plate and/or arrives at the second suction block 3 (or the previously described touching point/pick-up point H2, seeFIG. 1 ). Therollers 9 and 4 (and also the respective complementary or opposite rollers 8 and 7) are arranged as close as possible to the inspectingplate 1 but still outside the inspecting area of the inspectingplate 1. There are advantageously noholes 18 between the end of therollers FIG. 1 and the opposite ends FE1, SE1 of the inspectingplate 1. However, there can advantageously beholes 18 in the suction blocks which do not have a greater distance from the respective outer edges of theinspection plate 1 than 1 cm, in particular 0.5 cm. - The through holes 18 in the suction blocks 2, 3 may be evenly distributed over the entire upper surface of the suction blocks 2, 3. They may be arranged in a regular orthogonal grid. However, other arrangements are also possible. The inspecting
plate 1 does not have through holes. The inspectingplate 1 is closed and firmly sealed against soil and/or dust. - The lower or
complementary conveyor belt 13 of thefirst conveyor unit 50 is not shown, but divides thefirst suction block 2 in an upper part UP2 (first part) and a lower part LW2 (second) on each side of theconveyor belt 13. The lower orcomplementary conveyor belt 15 of thesecond conveyor unit 51 is not shown, but also divides thesecond suction block 3 in an upper part UP3 (first part) and a lower part LW3 (second part) on each side of theconveyor belt 15. In the area of thebelts second conveyor unit holes 18 in the suction blocks 2, 3. However, other more complex embodiments may even use suction holes in the conveyor belts. -
FIG. 3A, 3B and 3C are simplified cross-sectional side views on possible details of the embodiments of the invention. The upper surfaces O2, O1 and O3 of thefirst suction block 2, the inspectingplate 1 and thesecond suction block 3 serve as the document guiding surfaces for the document DOC, which can be a banknote. The document moves in the direction indicated by the arrow BN (from right to left). In the unclaimed example shown inFIG. 3A , the three upper surfaces O1 to O3 of the inspectingplate 1 and the twosuction blocks holes 18 which are provided in the twosuction blocks first conveyor unit 50 which is not shown. - In the embodiment according the invention shown in
FIG. 3B , the upper surface O2 (plane of the surface) of thefirst suction block 2 is slightly tilted with respect to the upper surface (plane of the surface) of the inspectingplate 1 by an angle α. This angle should be very small and not be greater than 4°. This angle provides that the document DOC is slightly tilted with respect to the upper surface O1 of the inspecting plate. The tilting or slight rotation of the plane of the document DOC provides that the document DOC is pressed to the inspectingplate 1 and air buffering between the document DOC and the inspecting plate is reduced or prevented. - In the embodiment shown in
FIG. 3C , there may also be small steps S1, S2 between the upper surfaces O1, O2, O3 of the first suction block, the inspecting plate and the second suction block. These small steps S1, S2 may have a height of up to 0.3 mm. This can further reduce the risk of air buffering below the document DOC. - The sensor unit, in particular the
sensor modules conveyor units 50 are advantageously part of the general transport system of the document processing/sorting machine. Thesensor modules second sensor module 22 advantageously includes the inspectingplate 1. -
FIG. 4 is a simplified block diagram of a document sorting/processing machine 200 according to an embodiment. The document sorting/processing machine 200 (or paper currency processing apparatus) comprises theapparatus 100 according the herein described aspects and embodiments. Themachine 200 is generally configured to process documents, for example paper currency (banknotes). The machine may comprise asupply section 301 in which a large number of documents/banknotes can be placed (stacked). There is also a pick-upstage 302 which is configured to pick up the documents from thesupply section 301. The documents are then transferred on atransfer path 303 comprising a plurality of endless conveyor units (not shown). The documents are transferred (moved, transported) by the conveyor units by holding the documents between conveyor belts. The documents are transferred to ageneral auditing device 303 one by one. Theauditing device 303 may comprise various stages among which theapparatus 100 according to the embodiments and aspects of the invention may be located. Theauditing device 303 may generally be configured to perform one or more of the following tasks: determining the denomination, shape thickness, top/back genuineness, normality or defacement and the like. Some or all of these tasks may then be performed by and in theapparatus 100 according to the aspects and embodiments of the invention. According to the result of the auditing, the documents/banknotes are either rejected and transferred to arejection stage 304 or approved and transferred tosection 305 for being re-circulated. - The
apparatus 100 according to the aspects and embodiments of the present invention provides, among others, a fitness sensor (sensor unit), for example including a camera system having a clear view to the document from both sides (reflection) and in transmission without disturbing elements like belts or support fences. The belt-free gap in the transport system does not increase the jam-rate in that particular part of the transport system. The length of the belt-free gap or length of the inspectingplate 1 in the direction of the movement of the document is kept very small. It may range up to 40 mm, and advantageously ranges from 7 mm to 40 mm, while 7 mm is also an advantageous value. - While various embodiments have been described, the description is intended to be exemplary, rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible that are within the scope of the claims. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Also, various modifications and changes may be made within the scope of the attached claims.
-
- 200: Document sorting/processing machine
- 100: Module/Apparatus
- 1: Inspecting plate
- 2: First suction block
- 3: Second suction block
- 4-11: Rollers
- 12-15: Belts
- 16, 17: Vacuum/Underpressure Generator
- 18: Holes in suction blocks
- 21: First sensor module
- 22: Second sensor module
- 50, 51: first and second conveyor
- 70: image processing unit
- BN: Direction of movement of document/banknote
- A1: First Airflow
- A2: Second Airflow
- D1: Length of Inspecting
plate 1 = Width of Gap - D2: Distance between inspecting
plate 1 andFirst Imaging Block 21 - O1, O2, O3: Upper surfaces (planes) of vacuum blocks 2, 3 and inspecting
plate 1 - S1, S2: steps between inspecting
plate 1 and vacuum blocks.
Claims (13)
- An apparatus (100) for a document sorting machine, in particular a banknote sorting machine, comprising: a first suction block (2); a second suction block (3); a first conveyor unit (50) for moving the document along a document guiding surface (O2) of the first suction block (2) and a second conveyor unit (51) for moving the document along a document guiding surface (O3) of the second suction block (3), the first suction block (2) and the first conveyor unit (50) and the second suction block (3) and the second conveyor unit (51) being arranged on opposite sides of a conveyor belt-free gap, the belt-free gap being configured to accommodate an inspecting plate (1) with an upper surface (O1) of a sensor unit; wherein the length of the gap is substantially shorter than the length of the document characterized in that the plane of the upper surface (O2) of the first suction block (2) is tilted with respect to the plane of the upper surface (O1) of the inspecting plate (1) by an angle α, such that the risk of air buffering below the document is reduced, and wherein the angle α is not greater than 4°.
- The apparatus according to claim 1, wherein between the upper surfaces (O2) and (O1) of the first suction block (2) and the inspecting plate (1) a step (S1) is arranged and wherein between the upper surfaces (O1) and (O3) of the inspecting plate (1) and the second suction block (3) a step (S2) is arranged, such that the risk of air buffering below the document is reduced.
- The apparatus according to claim 1 or 2, wherein the steps (S1), (S2) have a height of up to 0.3 mm.
- The apparatus according to anyone of the previous claims, wherein the first conveyor unit is configured to only release the document when a trailing edge of the document leaves the first suction block and/or the second conveyor unit is configured to only pull the document when a leading edge of the document leaves the belt-fee gap and/or when or after the leading edge of the document enters the second suction block.
- The apparatus according to claim 1 or 2, further comprising a sensor unit and the inspecting plate (1), the inspecting plate being arranged between the first suction block (2) and the second suction block (3) as a conveyor-free area and the sensor unit comprises the inspecting plate (1).
- The apparatus according to claim 5, wherein the sensor unit comprises a first sensor module (21) and a second sensor module (22), the first sensor module and the second sensor module being arranged on opposite sides of the inspecting plate (1).
- The apparatus according to claim 6, wherein a distance between the inspecting plate and the first sensor module is between 2 mm and 12 mm, in particular between 5 mm and 12 mm.
- The apparatus according to claim 6 or 7, wherein the inspecting plate (1) forms an integral part of the second sensor module (22).
- The apparatus according to anyone of the previous claims, wherein the length of the belt-free gap and/or the length (D1) of the inspecting plate (1) in the direction of the movement of the document is in a range from 7 mm to 40 mm.
- The apparatus according to anyone of the previous claims, wherein the first suction block (2) and the second suction block (3) comprise through holes (18) through which air is sucked by an underpressure below atmospheric pressure in a range of 0.1 bar to 0.8 bar, in particular 0.3 bar to 0.4 bar.
- The apparatus according to anyone of the claims 6 to 10, wherein the sensor unit is configured as an image capture device for taking images of the document in reflection from both sides of the document and in transmission while the document moves over the inspecting plate (1).
- The apparatus according to claim 11, further comprising a processing unit (70), wherein the processing unit is configured to process an image of the document received from the sensor unit and to determine the authenticity and/or soiling and/or fitness of the document.
- A document/banknote sorting machine (200) comprising an apparatus according to anyone of the previous claims.
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EP15171743.6A EP3104342B1 (en) | 2015-06-11 | 2015-06-11 | An apparatus for maintaining surface smoothness of a document during high speed processing |
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EP15171743.6A EP3104342B1 (en) | 2015-06-11 | 2015-06-11 | An apparatus for maintaining surface smoothness of a document during high speed processing |
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EP3104342B1 true EP3104342B1 (en) | 2020-05-27 |
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EP15171743.6A Active EP3104342B1 (en) | 2015-06-11 | 2015-06-11 | An apparatus for maintaining surface smoothness of a document during high speed processing |
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CN109345689B (en) * | 2018-10-15 | 2021-04-13 | 深圳怡化电脑股份有限公司 | Control method for reducing paper money clamping rate and paper money storage machine |
EP3825135B1 (en) * | 2019-11-21 | 2024-01-03 | Jesús Francisco Barberan Latorre | Substrate printing system |
CN112061855A (en) * | 2020-08-26 | 2020-12-11 | 邓贵霞 | Quick finishing device of multi-functional accounting document |
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JPS54117635A (en) * | 1978-03-03 | 1979-09-12 | Nec Corp | Optical mark reader |
IT1296551B1 (en) * | 1997-11-12 | 1999-07-09 | Gd Spa | METHOD FOR THE ELECTRO-OPTICAL CHECK OF SHEETS, IN PARTICULAR BANKNOTES. |
JP2004231339A (en) * | 2003-01-29 | 2004-08-19 | Toshiba Corp | Paper reading device |
US7703767B2 (en) | 2006-11-16 | 2010-04-27 | De La Rue North America, Inc. | Inertial flattening for note processing |
JP5558288B2 (en) * | 2010-09-16 | 2014-07-23 | 株式会社東芝 | Paper sheet inspection device |
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