EP0429184A1 - Sheet thickness detector - Google Patents
Sheet thickness detector Download PDFInfo
- Publication number
- EP0429184A1 EP0429184A1 EP90311698A EP90311698A EP0429184A1 EP 0429184 A1 EP0429184 A1 EP 0429184A1 EP 90311698 A EP90311698 A EP 90311698A EP 90311698 A EP90311698 A EP 90311698A EP 0429184 A1 EP0429184 A1 EP 0429184A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rib
- sheet
- nip
- thickness
- movement
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling 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
- B65H7/06—Controlling 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 responsive to presence of faulty articles or incorrect separation or feed
- B65H7/12—Controlling 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 responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/18—Rollers composed of several layers
- B65H2404/183—Rollers composed of several layers with outer layer helicoidally turned around shaft
- B65H2404/1831—Rollers composed of several layers with outer layer helicoidally turned around shaft wire around shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/10—Size; Dimensions
- B65H2511/13—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/52—Defective operating conditions
- B65H2511/524—Multiple articles, e.g. double feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/60—Details of intermediate means between the sensing means and the element to be sensed
- B65H2553/61—Mechanical means, e.g. contact arms
-
- 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 a sheet thickness detector of the kind comprising first and second moveable guide surfaces defining a nip through which a sheet passes in use; and a sensor for sensing relative separation movement between the guide surfaces.
- a sheet thickness detector of the kind comprising first and second moveable guide surfaces defining a nip through which a sheet passes in use; and a sensor for sensing relative separation movement between the guide surfaces.
- EP-A-0130824 An example of a thickness detector of the kind described is illustrated in EP-A-0130824.
- This detector has proved very successful but a problem can arise in some circumstances when detecting the thickness of sheets such as banknotes which carry an elongate feature having a thickness greater than that of a sheet.
- banknotes commonly carry security threads which in themselves have a thickness corresponding to that of the banknote itself with the result that if the security thread passes through the nip, a double thickness will be measured. This might either be used to set up a thickness datum for a "single sheet" which would be incorrect or would cause the apparatus making use of the detector to reject the sheet as a double sheet. Similar problems arise with sheets which have tape on them.
- a sheet thickness detector of the kind described is characterized in that the first guide surface carries a rib extending generally along but at an angle to the direction of movement of the surface whereby the rib moves laterally relative to the second guide surface at the nip, and whereby any portion of a sheet extending in the direction of movement of the sheet and having a thickness greater than the majority of that section of the sheet passing through the nip, the thickness of the sheet being no greater than the depth of the rib, will cause substantially no change in the relative separation of the surfaces except when the portion is sandwiched between the rib and the second surface.
- one of the moveable guide surfaces carries a rib which effectively accommodates any additional thickness due to an elongate feature on the sheet such as a security thread except where that thread passes directly under the rib. This will cause a sudden and short duration increase in the relative separation of the surfaces which can be detected by the sensor and thereby compensated for.
- the guide surfaces are defined by respective rollers, one of which defines a datum position and the other of which is moveable in response to the passage of a sheet through the nip.
- the rib will be provided on the datum roller.
- Other cooperating guide surfaces are possible, however, such as conveyors.
- ribs Although a single rib may be adequate, in the preferred example a number of ribs are provided and spaced along the guide surface and typically the end of one rib overlaps the start of the next rib in the direction of movement. In general, the ribs will define at least part of a spiral or helix.
- the invention is particularly applicable to banknote monitoring systems for example for use in banknote dispensing, counting or sorting machines so as to accommodate problems due to security threads and the like.
- the detector shown in Figures 1 and 2 may form part of an otherwise conventional sheet processing system such as a banknote counter or sorter in which sheets are fed in series to the detector.
- the detector shown in Figure 1 comprises a pair of datum rollers 1,2 mounted non-rotatably to a shaft 3 which is itself rotated by a motor (not shown). Each of the datum rollers 1,2 is in pinch with a respective detect roller 4,5 non-rotatably mounted on a shaft 6. Shafts 3 and 6 are geared together (not shown).
- Each of the detect rollers 4,5 can move towards and away from the respective datum rollers 1,2 and is urged against the respective datum roller to define nips 7,8 under the action of respective springs 9,10; or the nips may be achieved by the detect rollers 4,5 being internally sprung so that springs 9,10 act purely in a follower role.
- each spring for example the spring 9 as shown in Figure 2, urges a respective pivoted bar 11,12 against the respective detect rollers 4,5. Linear movement of bar 11 is detected in a conventional manner similar for example to that described in WO-A-82/01698.
- the bar 11 is pivoted at 30 and is connected at its end remote from the roller 4 to a core 31 of a linear variable differential transformer (LVDT) 32 which is activated by an oscillator 33.
- a voltage signal representative of the angular displacement is output by the LVDT 32 and is applied to a microprocessor 13 which monitors the signal to determine the separation between the respective detect and datum roller pairs in order to detect the passage of a banknote through the nips 7,8.
- An example of a banknote 14 is indicated schematically in Figure 1 and it will be seen that this banknote carries a security thread 15 in alignment with the nip 7.
- the datum and detect rollers 1,2,4,5 each have smooth outer surfaces. This means that if a security thread passes through the nip between a pair of these rollers, they will be deflected throughout the passage of the banknote by an amount corresponding to the thickness of the thread and the banknote together. This will result in a single profile from the nip defined by rollers 1,4 of the form shown in Figure 5 in which t represents the thickness of the banknote 14, T represents the thickness of the security thread, and L is the length of the banknote 14 in the direction of feed. Clearly, in this conventional case, it will appear to the microprocessor 13 that an overthick sheet has passed through the nip leading to the generation of an error message.
- each of the datum rollers 1,2 is profiled.
- a simple profile is illustrated in Figure 3 in which the roller carries a spiral rib 16 extending fully around its circumference as also shown again in Figure 6.
- the rib is provided on the datum roller, it may alternatively be formed on the detect roller.
- the datum roller of Figure 3 rotates with a corresponding detect roller, the rib 16 will appear to precess, traversing backwards and forwards cyclically across the lateral width of the nip and thus across the area of the sheet passing through the nip which is detected.
- the security thread arrives at the nip, for example the nip 7 in Figure 1, at a point at which the rib is displaced laterally from the thread, then a part of the sheet will be received between the rib and the detect roller forcing the detect roller to separate from the datum roller by an amount corresponding to the thickness of the sheet alone.
- This will cause a corresponding output signal to be generated which is sent to the microprocessor 13, that part of the signal corresponding to the section labelled "a" in Figure 4.
- the rib 16 will precess across the nip until it reaches the security thread at which point it will ride up over the security thread causing a greater separation between the detect and datum rollers.
- the microprocessor 13 is programmed to detect short term excursions of the outputs from some mean level and to exclude those excursions from its decision making proceedure.
- the datum roller may comprise a number of helical threads 17, for example four such threads as illustrated in Figure 7. It is preferred that there is always an overlap in the lateral direction between successive, circumferentially spaced threads or ribs.
Abstract
Description
- The invention relates to a sheet thickness detector of the kind comprising first and second moveable guide surfaces defining a nip through which a sheet passes in use; and a sensor for sensing relative separation movement between the guide surfaces. Such detectors are hereinafter referred to as of the kind described.
- An example of a thickness detector of the kind described is illustrated in EP-A-0130824. This detector has proved very successful but a problem can arise in some circumstances when detecting the thickness of sheets such as banknotes which carry an elongate feature having a thickness greater than that of a sheet. For example, banknotes commonly carry security threads which in themselves have a thickness corresponding to that of the banknote itself with the result that if the security thread passes through the nip, a double thickness will be measured. This might either be used to set up a thickness datum for a "single sheet" which would be incorrect or would cause the apparatus making use of the detector to reject the sheet as a double sheet. Similar problems arise with sheets which have tape on them.
- In accordance with the present invention, a sheet thickness detector of the kind described is characterized in that the first guide surface carries a rib extending generally along but at an angle to the direction of movement of the surface whereby the rib moves laterally relative to the second guide surface at the nip, and whereby any portion of a sheet extending in the direction of movement of the sheet and having a thickness greater than the majority of that section of the sheet passing through the nip, the thickness of the sheet being no greater than the depth of the rib, will cause substantially no change in the relative separation of the surfaces except when the portion is sandwiched between the rib and the second surface.
- We have devised a modified form of detector in which one of the moveable guide surfaces carries a rib which effectively accommodates any additional thickness due to an elongate feature on the sheet such as a security thread except where that thread passes directly under the rib. This will cause a sudden and short duration increase in the relative separation of the surfaces which can be detected by the sensor and thereby compensated for.
- Preferably, the guide surfaces are defined by respective rollers, one of which defines a datum position and the other of which is moveable in response to the passage of a sheet through the nip. Typically, the rib will be provided on the datum roller. Other cooperating guide surfaces are possible, however, such as conveyors.
- Although a single rib may be adequate, in the preferred example a number of ribs are provided and spaced along the guide surface and typically the end of one rib overlaps the start of the next rib in the direction of movement. In general, the ribs will define at least part of a spiral or helix.
- The invention is particularly applicable to banknote monitoring systems for example for use in banknote dispensing, counting or sorting machines so as to accommodate problems due to security threads and the like.
- Some examples of detectors according to the invention will now be described with reference to the accompaning drawings, in which:-
- Figure 1 is a schematic front elevation of the detector;
- Figure 2 is a schematic side elevation of the detector shown in Figure 1:
- Figure 3 illustrates one example of a profiled datum roller;
- Figure 4 illustrates the output signal from the detector incorporating the Figure 3 datum roller;
- Figure 5 illustrates the output signal from a conventional detector; and
- Figures 6 and 7 illustrate two further examples of datum rollers.
- The detector shown in Figures 1 and 2 may form part of an otherwise conventional sheet processing system such as a banknote counter or sorter in which sheets are fed in series to the detector. The detector shown in Figure 1 comprises a pair of
datum rollers 1,2 mounted non-rotatably to ashaft 3 which is itself rotated by a motor (not shown). Each of thedatum rollers 1,2 is in pinch with arespective detect roller 4,5 non-rotatably mounted on a shaft 6.Shafts 3 and 6 are geared together (not shown). Each of thedetect rollers 4,5 can move towards and away from therespective datum rollers 1,2 and is urged against the respective datum roller to definenips 7,8 under the action ofrespective springs 9,10; or the nips may be achieved by thedetect rollers 4,5 being internally sprung so thatsprings 9,10 act purely in a follower role. As can be seen in Figure 2, each spring, for example thespring 9 as shown in Figure 2, urges a respectivepivoted bar respective detect rollers 4,5. Linear movement ofbar 11 is detected in a conventional manner similar for example to that described in WO-A-82/01698. Thebar 11 is pivoted at 30 and is connected at its end remote from the roller 4 to acore 31 of a linear variable differential transformer (LVDT) 32 which is activated by anoscillator 33. A voltage signal representative of the angular displacement is output by theLVDT 32 and is applied to amicroprocessor 13 which monitors the signal to determine the separation between the respective detect and datum roller pairs in order to detect the passage of a banknote through thenips 7,8. An example of abanknote 14 is indicated schematically in Figure 1 and it will be seen that this banknote carries asecurity thread 15 in alignment with thenip 7. - In a conventional arrangement (not shown) the datum and detect
rollers banknote 14, T represents the thickness of the security thread, and L is the length of thebanknote 14 in the direction of feed. Clearly, in this conventional case, it will appear to themicroprocessor 13 that an overthick sheet has passed through the nip leading to the generation of an error message. - To overcome this problem, each of the
datum rollers 1,2 is profiled. A simple profile is illustrated in Figure 3 in which the roller carries aspiral rib 16 extending fully around its circumference as also shown again in Figure 6. Although in the present example the rib is provided on the datum roller, it may alternatively be formed on the detect roller. When the datum roller of Figure 3 rotates with a corresponding detect roller, therib 16 will appear to precess, traversing backwards and forwards cyclically across the lateral width of the nip and thus across the area of the sheet passing through the nip which is detected. Consequently, if the security thread arrives at the nip, for example thenip 7 in Figure 1, at a point at which the rib is displaced laterally from the thread, then a part of the sheet will be received between the rib and the detect roller forcing the detect roller to separate from the datum roller by an amount corresponding to the thickness of the sheet alone. This will cause a corresponding output signal to be generated which is sent to themicroprocessor 13, that part of the signal corresponding to the section labelled "a" in Figure 4. Therib 16 will precess across the nip until it reaches the security thread at which point it will ride up over the security thread causing a greater separation between the detect and datum rollers. This will cause an increase in the linear deflection signal as indicated at "b" in Figure 4. This additional deflection will only last for a short time, however, while the rib precesses over the security thread and then returns into engagement with the main part of the banknote, with the result that the seperation between the datum and detect rollers decreases and the output signal returns to the level shown at "c" in Figure 4. - It will be seen therefore that with the invention it is possible to detect the presence of the security thread and to compensate for it. The
microprocessor 13 is programmed to detect short term excursions of the outputs from some mean level and to exclude those excursions from its decision making proceedure. - In a modified form, the datum roller may comprise a number of
helical threads 17, for example four such threads as illustrated in Figure 7. It is preferred that there is always an overlap in the lateral direction between successive, circumferentially spaced threads or ribs.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB898925354A GB8925354D0 (en) | 1989-11-09 | 1989-11-09 | Sheet thickness detector |
GB8925354 | 1989-11-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0429184A1 true EP0429184A1 (en) | 1991-05-29 |
EP0429184B1 EP0429184B1 (en) | 1993-12-15 |
Family
ID=10666018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90311698A Expired - Lifetime EP0429184B1 (en) | 1989-11-09 | 1990-10-25 | Sheet thickness detector |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0429184B1 (en) |
KR (1) | KR940011366B1 (en) |
DE (1) | DE69005269T2 (en) |
GB (1) | GB8925354D0 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120256371A1 (en) * | 2009-10-01 | 2012-10-11 | De La Rue International Limited | Apparatus and method for detecting the thickness of a sheet document |
EP3214606A4 (en) * | 2014-10-30 | 2017-11-15 | GRG Banking Equipment Co., Ltd. | Method and device for detecting overlapped bank notes |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0064523A1 (en) * | 1980-11-07 | 1982-11-17 | De La Rue Syst | Apparatus for detecting the thickness of sheets. |
EP0130824A2 (en) * | 1983-07-01 | 1985-01-09 | De La Rue Systems Limited | Sheet sensing apparatus |
-
1989
- 1989-11-09 GB GB898925354A patent/GB8925354D0/en active Pending
-
1990
- 1990-10-25 DE DE69005269T patent/DE69005269T2/en not_active Expired - Fee Related
- 1990-10-25 EP EP90311698A patent/EP0429184B1/en not_active Expired - Lifetime
- 1990-11-09 KR KR1019900018140A patent/KR940011366B1/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0064523A1 (en) * | 1980-11-07 | 1982-11-17 | De La Rue Syst | Apparatus for detecting the thickness of sheets. |
EP0130824A2 (en) * | 1983-07-01 | 1985-01-09 | De La Rue Systems Limited | Sheet sensing apparatus |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120256371A1 (en) * | 2009-10-01 | 2012-10-11 | De La Rue International Limited | Apparatus and method for detecting the thickness of a sheet document |
US8651481B2 (en) * | 2009-10-01 | 2014-02-18 | De La Rue International Limited | Apparatus and method for detecting the thickness of a sheet document |
EP3214606A4 (en) * | 2014-10-30 | 2017-11-15 | GRG Banking Equipment Co., Ltd. | Method and device for detecting overlapped bank notes |
US10049523B2 (en) | 2014-10-30 | 2018-08-14 | Grg Banking Equipment Co., Ltd. | Method and device for detecting overlapped bank notes |
Also Published As
Publication number | Publication date |
---|---|
DE69005269T2 (en) | 1994-09-08 |
KR910010362A (en) | 1991-06-29 |
EP0429184B1 (en) | 1993-12-15 |
KR940011366B1 (en) | 1994-12-07 |
DE69005269D1 (en) | 1994-01-27 |
GB8925354D0 (en) | 1989-12-28 |
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