CA2141760C - Installation for quality control of printed sheets, especially security paper - Google Patents
Installation for quality control of printed sheets, especially security paper Download PDFInfo
- Publication number
- CA2141760C CA2141760C CA002141760A CA2141760A CA2141760C CA 2141760 C CA2141760 C CA 2141760C CA 002141760 A CA002141760 A CA 002141760A CA 2141760 A CA2141760 A CA 2141760A CA 2141760 C CA2141760 C CA 2141760C
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- sheet
- camera
- quality
- quality control
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- Expired - Fee Related
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- 238000003908 quality control method Methods 0.000 title claims abstract description 17
- 238000009434 installation Methods 0.000 title abstract description 15
- 241001131696 Eurystomus Species 0.000 description 9
- 238000005286 illumination Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
-
- 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
Abstract
The installation for quality control of printed sheets (1) comprises means (8-13) for transferring said sheets, and cameras (2, 4, 6) for checking the print quality. The transfer means (8-13) are designed to transport the sheets in a plane and to allow the print quality of each of the faces of the sheet to be checked as well as a quality check using transparency to be carried out in succession and in a single pass. The means for checking each face are two cameras (2, 3) located on either side of said plane at two offset locations, the transfer means being designed to leave an open window at the side of each camera. A third camera (6) carries out the check using transparency.
Description
DE LA RUE GIORI S.A. LAUSANNE/SWITZERLAND
Installation for quality control of printed sheets, especially security paper FIELD OF THE INVENTION
The present invention relates to an installation for quality control of printed sheets, especially security paper, comprising means for transferring said sheets and means for checking the print quality.
PRIOR ART
Quality control of a piece of paper printed on both faces requires each of its faces to be checked by reflection, as well as a check using transparency. The transparency check makes it possible to check the quality of the paper, the register of the images, the possible presence of the watermark. If the sheet is printed only on one face, one check using reflection and one using transparency are carried out. In the installations for quality control of printed sheets either matrix cameras or scanning cameras are used. When matrix cameras are used, each of the three checks, namely the check of the two faces of the printed sheet (using reflection) and the check using transparency, requires a long transport section at least equal to a sheet, which leads to a bulky and expensive installation.
When using scanning cameras, a cylinder is used over which the sheet passes for checking one face. Such a cylinder is described in EP-A-559,615 of the applicant.
An installation for transferring sheets in the flat state, this installation being equipped with gripper bars making it possible to grasp the edge of a sheet to be checked and slide it over support bars for a transparency check of a narrow zone is described in EP-A-0,559,616 of the applicant. Suction nozzles are provided on one side of the checking slit on the support bars to allow the checked sheet to be kept flat.
It has proved to be the case that for checking the print quality of a printed sheet, the latter must preferably be completely flat on a planar surface, rather than on a cylinder, and also on a continuous surface which, on the one hand, makes sure that the sheet is perfectly flat and, on the other hand, makes sure that the background is homogeneous, at least optically.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an installation for checking the print quality of a printed sheet making it possible to achieve the above-mentioned conditions, and in addition to obtain a compact installation.
In accordance with a broad aspect, the invention seeks to provide a quality control assembly for a printed sheet, the sheet having a length and first and second faces. The quality control assembly comprises means for transferring the sheet and means for checking quality of the sheet. The means for transferring is adapted to transport the sheet in a plane and to enable the means for checking quality of the sheet to check a print quality of each of the first and second faces of the sheet in a single pass. The means for checking quality of the sheet comprises first and second cameras respectively located on opposite sides of the plane at two offset locations along the plane. The first camera is operative to check the print quality of the first face using reflection and the second camera being operative to check the print quality of the second face using reflection. The means for checking the sheet also comprises a third camera operative to check the quality of the sheet using transparency. The means for transferring the sheet comprises superposed transfer devices operative to allow travel 3o of the sheet therebetween. The means for transferring the sheet defines a first open window adjacent a front of the first camera by having just one transfer device adjacent the front of the first camera and adapted to hold the sheet using suction truly in place facing the first camera. The means for transferring the sheet defines a second open window adjacent a front of the second camera by having just one transfer device adjacent the front of the second camera and adapted to hold the sheet using suction truly in place facing the second camera. The means for transferring the sheet also comprises a pair of superposed plates adjacent a front of the third camera and adapted to keep the sheet flat. Each of the superposed plates has a slit to allow the third camera to check the quality of the sheet using transparency, the slit of each of the superposed plates being arranged perpendicularly to a direction of travel of the sheet.
to The advantages of the installation according to the invention are as follows.
For checking the print quality of a security paper, such as a banknote, currency paper, etc., especially using reflection, the sheet is held perfectly flat in front of the camera which makes it possible to improve the reliability and quality of the checking.
With travel taking place in a plane which is preferably horizontal, the transfer means used are the same both for the quality check using reflection and the one using transparency, which makes it possible to rationalize the manufacture and carry out the three checks in a single pass.
According to the preferred embodiment, linear array cameras (line by line) are used, which makes it possible to have narrow reading windows. Indeed, it is sufficient for the window for checking one face using reflection to have a length corresponding to a fraction -2a-214~.'~-~~
of the length of the sheet. The length of the window is a function of the resolution ~of the camera used and it must allow the illumination and reflection of the checked zone. Thus, a very compact checking installation may be obtained, the two windows for reflection checking each requiring only a fraction of the length of a sheet.
According to a preferred embodiment, the transfer means are two superposed conveyor belt devices, the sheets being gripped between these devices which makes it possible to make sure that the sheet is truly flat. For checking the print quality using reflection at the , locations where each of the cameras providing for this check can be found, and over a length corresponding to a length of the window, one of the conveyor belts is broken and the sheet is held on the other belt by suction, this simultaneously ensuring that it is held perfectly flat and also providing a continuous background which allows optical checking under optimal conditions.
According to another alternative embodiment, instead of using conveyor belts, use is made of super posed guiding plates and of pairs of rollers allowing the sheets to be advanced, the spacing between the rollers being less than the length of the sheets to be checked.
In front of the cameras for checking using reflection, one of the plates has a bit missing over a length equal to the length of the window, the second plate holding the sheet truly flat by suction, which also makes it possible to ensure a perfectly flat position and a continuous background for checking quality.
For the purpose of avoiding the suction holes being able to disrupt the optical homogeneity of the support on which the sheet can be found, when checking using reflection, the suction holes are oblique, their axis forming an angle of 30° - 45° relative to the transport plane. This inclination of the holes allows the surface on which the sheet is to be found to be homo-geneous from the optical point of view.
The check of transparency is done using, facing said camera, a pair of superposed plates which are equipped with a slit perpendicular to the travel of the sheets, which ensures a perfectly flat position of the sheet. At this location, it is also possible to provide lateral guidance of the sheets as they pass between the plates to prevent them from becoming crooked.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail with the aid of the appended drawing.
Figure 1 is a diagrammatic side view of an installation with conveyor belts.
Figure 2a shows an enlargement of the location for checking using transparency.
Figure ~2b is a plan view of the preceding figure.
Figure 3 is a diagrammatic side view of an installation according to the present invention, the transport means being guide plates and superposed roll-ers.
ment.
Figure 4 is a partial view of a preferred embodi-DESCRIPTION OF THE PREFERRED EMBODIMENT
The device of Figure 1 comprises transfer means for sheets 1 which are printed on both sides and intended to be checked by two cameras 2, 3 which carry out a check on the print quality of each face of the sheet 1 using reflection, illuminating means 4, 5 being provided for this purpose, and a camera 6 for checking quality using transparency, a light source 7 being located on the other side of the camera.
The means for transferring the sheet 1 are composed of superposed conveyor belts 8, 9, 10, 11, 12, 13. The superposed belts are made of or covered with an elastic substance and are in contact. In this way the sheet is gripped between the two belts and remains truly flat. Nevertheless, in the figures, for the clarity of the drawing, this condition has not been respected. At the locations of the cameras 2 and 3, the conveyor, belt on one side of the camera is broken. In this way, for the 2141 ~ f~
camera 2 a space is provided facing the camera between the conveyor belts 9 and 10 in order to allow this camera to check the upper face of the sheet 1. In this gap between conveyor belts 9 and 10 the sheet 1 is held against the conveyor belt 8 by suction. For this purpose, a chamber 13 connected by a source of partial vacuum (not represented) is beneath the belt 8 which is equipped with holes in communication with the chamber 13 to allow the sheet 1 to be held truly flat on its surface. The belt slides over the edge of the chamber 14 to ensure good belt/chamber sealing and limits losses in depression.
In the same way, when the sheet passes facing the camera 3, a space corresponding to the length of the sheet exists between the conveyor belts 8 and 11 in order to allow the image printed on the other face of the sheet 1 to be checked. When the sheet passes in front of the camera 3, it is held against the conveyor belt 10 by means of a second chamber 15 connected to a source of partial vacuum, the belt also being equipped with holes in communication with the chamber 15.
For the quality check using transparency, facing the camera 6 each of the plates 16, 17 is equipped respectively with a narrow slit 18, 19 pointing perpen dicularly to the direction of travel in order to allow the transparency check.
According to a preferred alternative embodiment, in this chamber for checking the quality using transpar-ency, means are provided for guiding the lateral ends of the sheet in order to prevent the sheet from becoming crooked between the two plates 16 and 17. These lateral guiding devices may be simple slideways which can be moved perpendicularly to the direction of travel of the sheet to allow them to be adapted to the width of the sheet to be checked.
An alternative embodiment will now be described with the aid of Figure 3.
The device of Figure 3 is similar to that of Figure 1 except that the means for transferring the sheets are composed of guide plates and of rollers. In ~141'~~U
this device too, two cameras 22 and 23 are arranged for checking the print quality on each of the faces of a sheet 21, illuminating means 24 and 25 providing the illumination of each of the faces of the sheet to be checked, while a camera 26 for the transparency check with a light source 27 are also provided. The transfer means are composed on the one hand, of the plates 28, 29, 30, 31, 32, 33, 34, 35 and of pairs of rollers 36, 37, 38, 39, 40, 41, 42 and 43 whose longitudinal spacing is less than the length of a sheet 21. The role of the plates is to make sure that the printed sheets travel completely flat and the rollers 35 to 42 provide for the forward travel of the sheet. Two superposed rollers and two superposed plates are in contact and are made of or covered with an elastic substance thus allowing the sheets to be transported flat. Nevertheless, for the clarity of the drawing, this condition has not been respected. Facing each of the cameras 22 and 23 there is no plate between the face of the sheet 21 to be checked and the camera, precisely in order to allow the image to be checked using reflection. The plate on the other side of the camera is perforated and equipped with a chamber 44, 45 respectively, connected to a source of partial vacuum and sucks the sheet in order to keep the latter completely flat against it. The sheet 21 slides over said plate pushed by the rollers 37 and pulled by the rollers 38, respectively 39 and 40.
The transparency check in front of the camera 26 is also done in the same way as for the device 1 by means of superposed plates 46, 47 which leave checking slits 48, 49 between them.
Figure 4 represents the preferred embodiment, that is to say the installation with slits for the check using reflection, the length of which slits corresponds to a fraction of the length of the sheet, usually 2-3 cm, allowing good illumination of the zone to be checked. Of course, this possibility is offered by the use of a linear (line by line) array camera in step with the forward travel of each sheet. Conveyor belts 8', 9' and ~~4I7~t~
10' have therefore been represented, the spacing d between~the belts 9' and 10' being merely a fraction of the length of the sheet. Of course, the same arrangement may be used for the second window and also for the embodiment of Figure 3.
Also represented on the belt 8' are inclined holes 50 making it possible to have an optically homo-geneous plane because parasitic light cannot penetrate via the lower end of the holes and the incident light reflected is the same color over the whole of the surface resting on the belt. That is to say that the fact that there are holes on the belt has no effect on the reflected light, by comparison with a belt without holes.
The means described f or holding the sheets f acing the cameras using suction for the checking using reflec tion are merely an example, and other embodiments are possible.
Installation for quality control of printed sheets, especially security paper FIELD OF THE INVENTION
The present invention relates to an installation for quality control of printed sheets, especially security paper, comprising means for transferring said sheets and means for checking the print quality.
PRIOR ART
Quality control of a piece of paper printed on both faces requires each of its faces to be checked by reflection, as well as a check using transparency. The transparency check makes it possible to check the quality of the paper, the register of the images, the possible presence of the watermark. If the sheet is printed only on one face, one check using reflection and one using transparency are carried out. In the installations for quality control of printed sheets either matrix cameras or scanning cameras are used. When matrix cameras are used, each of the three checks, namely the check of the two faces of the printed sheet (using reflection) and the check using transparency, requires a long transport section at least equal to a sheet, which leads to a bulky and expensive installation.
When using scanning cameras, a cylinder is used over which the sheet passes for checking one face. Such a cylinder is described in EP-A-559,615 of the applicant.
An installation for transferring sheets in the flat state, this installation being equipped with gripper bars making it possible to grasp the edge of a sheet to be checked and slide it over support bars for a transparency check of a narrow zone is described in EP-A-0,559,616 of the applicant. Suction nozzles are provided on one side of the checking slit on the support bars to allow the checked sheet to be kept flat.
It has proved to be the case that for checking the print quality of a printed sheet, the latter must preferably be completely flat on a planar surface, rather than on a cylinder, and also on a continuous surface which, on the one hand, makes sure that the sheet is perfectly flat and, on the other hand, makes sure that the background is homogeneous, at least optically.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an installation for checking the print quality of a printed sheet making it possible to achieve the above-mentioned conditions, and in addition to obtain a compact installation.
In accordance with a broad aspect, the invention seeks to provide a quality control assembly for a printed sheet, the sheet having a length and first and second faces. The quality control assembly comprises means for transferring the sheet and means for checking quality of the sheet. The means for transferring is adapted to transport the sheet in a plane and to enable the means for checking quality of the sheet to check a print quality of each of the first and second faces of the sheet in a single pass. The means for checking quality of the sheet comprises first and second cameras respectively located on opposite sides of the plane at two offset locations along the plane. The first camera is operative to check the print quality of the first face using reflection and the second camera being operative to check the print quality of the second face using reflection. The means for checking the sheet also comprises a third camera operative to check the quality of the sheet using transparency. The means for transferring the sheet comprises superposed transfer devices operative to allow travel 3o of the sheet therebetween. The means for transferring the sheet defines a first open window adjacent a front of the first camera by having just one transfer device adjacent the front of the first camera and adapted to hold the sheet using suction truly in place facing the first camera. The means for transferring the sheet defines a second open window adjacent a front of the second camera by having just one transfer device adjacent the front of the second camera and adapted to hold the sheet using suction truly in place facing the second camera. The means for transferring the sheet also comprises a pair of superposed plates adjacent a front of the third camera and adapted to keep the sheet flat. Each of the superposed plates has a slit to allow the third camera to check the quality of the sheet using transparency, the slit of each of the superposed plates being arranged perpendicularly to a direction of travel of the sheet.
to The advantages of the installation according to the invention are as follows.
For checking the print quality of a security paper, such as a banknote, currency paper, etc., especially using reflection, the sheet is held perfectly flat in front of the camera which makes it possible to improve the reliability and quality of the checking.
With travel taking place in a plane which is preferably horizontal, the transfer means used are the same both for the quality check using reflection and the one using transparency, which makes it possible to rationalize the manufacture and carry out the three checks in a single pass.
According to the preferred embodiment, linear array cameras (line by line) are used, which makes it possible to have narrow reading windows. Indeed, it is sufficient for the window for checking one face using reflection to have a length corresponding to a fraction -2a-214~.'~-~~
of the length of the sheet. The length of the window is a function of the resolution ~of the camera used and it must allow the illumination and reflection of the checked zone. Thus, a very compact checking installation may be obtained, the two windows for reflection checking each requiring only a fraction of the length of a sheet.
According to a preferred embodiment, the transfer means are two superposed conveyor belt devices, the sheets being gripped between these devices which makes it possible to make sure that the sheet is truly flat. For checking the print quality using reflection at the , locations where each of the cameras providing for this check can be found, and over a length corresponding to a length of the window, one of the conveyor belts is broken and the sheet is held on the other belt by suction, this simultaneously ensuring that it is held perfectly flat and also providing a continuous background which allows optical checking under optimal conditions.
According to another alternative embodiment, instead of using conveyor belts, use is made of super posed guiding plates and of pairs of rollers allowing the sheets to be advanced, the spacing between the rollers being less than the length of the sheets to be checked.
In front of the cameras for checking using reflection, one of the plates has a bit missing over a length equal to the length of the window, the second plate holding the sheet truly flat by suction, which also makes it possible to ensure a perfectly flat position and a continuous background for checking quality.
For the purpose of avoiding the suction holes being able to disrupt the optical homogeneity of the support on which the sheet can be found, when checking using reflection, the suction holes are oblique, their axis forming an angle of 30° - 45° relative to the transport plane. This inclination of the holes allows the surface on which the sheet is to be found to be homo-geneous from the optical point of view.
The check of transparency is done using, facing said camera, a pair of superposed plates which are equipped with a slit perpendicular to the travel of the sheets, which ensures a perfectly flat position of the sheet. At this location, it is also possible to provide lateral guidance of the sheets as they pass between the plates to prevent them from becoming crooked.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail with the aid of the appended drawing.
Figure 1 is a diagrammatic side view of an installation with conveyor belts.
Figure 2a shows an enlargement of the location for checking using transparency.
Figure ~2b is a plan view of the preceding figure.
Figure 3 is a diagrammatic side view of an installation according to the present invention, the transport means being guide plates and superposed roll-ers.
ment.
Figure 4 is a partial view of a preferred embodi-DESCRIPTION OF THE PREFERRED EMBODIMENT
The device of Figure 1 comprises transfer means for sheets 1 which are printed on both sides and intended to be checked by two cameras 2, 3 which carry out a check on the print quality of each face of the sheet 1 using reflection, illuminating means 4, 5 being provided for this purpose, and a camera 6 for checking quality using transparency, a light source 7 being located on the other side of the camera.
The means for transferring the sheet 1 are composed of superposed conveyor belts 8, 9, 10, 11, 12, 13. The superposed belts are made of or covered with an elastic substance and are in contact. In this way the sheet is gripped between the two belts and remains truly flat. Nevertheless, in the figures, for the clarity of the drawing, this condition has not been respected. At the locations of the cameras 2 and 3, the conveyor, belt on one side of the camera is broken. In this way, for the 2141 ~ f~
camera 2 a space is provided facing the camera between the conveyor belts 9 and 10 in order to allow this camera to check the upper face of the sheet 1. In this gap between conveyor belts 9 and 10 the sheet 1 is held against the conveyor belt 8 by suction. For this purpose, a chamber 13 connected by a source of partial vacuum (not represented) is beneath the belt 8 which is equipped with holes in communication with the chamber 13 to allow the sheet 1 to be held truly flat on its surface. The belt slides over the edge of the chamber 14 to ensure good belt/chamber sealing and limits losses in depression.
In the same way, when the sheet passes facing the camera 3, a space corresponding to the length of the sheet exists between the conveyor belts 8 and 11 in order to allow the image printed on the other face of the sheet 1 to be checked. When the sheet passes in front of the camera 3, it is held against the conveyor belt 10 by means of a second chamber 15 connected to a source of partial vacuum, the belt also being equipped with holes in communication with the chamber 15.
For the quality check using transparency, facing the camera 6 each of the plates 16, 17 is equipped respectively with a narrow slit 18, 19 pointing perpen dicularly to the direction of travel in order to allow the transparency check.
According to a preferred alternative embodiment, in this chamber for checking the quality using transpar-ency, means are provided for guiding the lateral ends of the sheet in order to prevent the sheet from becoming crooked between the two plates 16 and 17. These lateral guiding devices may be simple slideways which can be moved perpendicularly to the direction of travel of the sheet to allow them to be adapted to the width of the sheet to be checked.
An alternative embodiment will now be described with the aid of Figure 3.
The device of Figure 3 is similar to that of Figure 1 except that the means for transferring the sheets are composed of guide plates and of rollers. In ~141'~~U
this device too, two cameras 22 and 23 are arranged for checking the print quality on each of the faces of a sheet 21, illuminating means 24 and 25 providing the illumination of each of the faces of the sheet to be checked, while a camera 26 for the transparency check with a light source 27 are also provided. The transfer means are composed on the one hand, of the plates 28, 29, 30, 31, 32, 33, 34, 35 and of pairs of rollers 36, 37, 38, 39, 40, 41, 42 and 43 whose longitudinal spacing is less than the length of a sheet 21. The role of the plates is to make sure that the printed sheets travel completely flat and the rollers 35 to 42 provide for the forward travel of the sheet. Two superposed rollers and two superposed plates are in contact and are made of or covered with an elastic substance thus allowing the sheets to be transported flat. Nevertheless, for the clarity of the drawing, this condition has not been respected. Facing each of the cameras 22 and 23 there is no plate between the face of the sheet 21 to be checked and the camera, precisely in order to allow the image to be checked using reflection. The plate on the other side of the camera is perforated and equipped with a chamber 44, 45 respectively, connected to a source of partial vacuum and sucks the sheet in order to keep the latter completely flat against it. The sheet 21 slides over said plate pushed by the rollers 37 and pulled by the rollers 38, respectively 39 and 40.
The transparency check in front of the camera 26 is also done in the same way as for the device 1 by means of superposed plates 46, 47 which leave checking slits 48, 49 between them.
Figure 4 represents the preferred embodiment, that is to say the installation with slits for the check using reflection, the length of which slits corresponds to a fraction of the length of the sheet, usually 2-3 cm, allowing good illumination of the zone to be checked. Of course, this possibility is offered by the use of a linear (line by line) array camera in step with the forward travel of each sheet. Conveyor belts 8', 9' and ~~4I7~t~
10' have therefore been represented, the spacing d between~the belts 9' and 10' being merely a fraction of the length of the sheet. Of course, the same arrangement may be used for the second window and also for the embodiment of Figure 3.
Also represented on the belt 8' are inclined holes 50 making it possible to have an optically homo-geneous plane because parasitic light cannot penetrate via the lower end of the holes and the incident light reflected is the same color over the whole of the surface resting on the belt. That is to say that the fact that there are holes on the belt has no effect on the reflected light, by comparison with a belt without holes.
The means described f or holding the sheets f acing the cameras using suction for the checking using reflec tion are merely an example, and other embodiments are possible.
Claims (8)
1. A quality control assembly for a printed sheet, the sheet having a length and first and second faces, said quality control assembly comprising means for transferring the sheet and means for checking quality of the sheet, wherein:
(a) said means for transferring is adapted to transport the sheet in a plane and to enable said means for checking quality of the sheet to check a print quality of each of the first and second faces of the sheet in a single pass;
(b) said means for checking quality of the sheet comprises first and second cameras respectively located on opposite sides of the plane at two offset locations along the plane, said first camera being operative to check the print quality of the first face using reflection and said second camera being operative to check the print quality of the second face using reflection; and a third camera operative to check the quality of the sheet using transparency;
(c) said means for transferring the sheet comprises superposed transfer devices operative to allow travel of the sheet therebetween, said means for transferring defining a first open window adjacent a front of said first camera by having just one transfer device adjacent the front of said first camera and adapted to hold the sheet using suction truly in place facing said first camera, said means for transferring defining a second open window adjacent a front of said second camera by having just one transfer device adjacent the front of said second camera and adapted to hold the sheet using suction truly in place facing said second camera; and (d) said means for transferring the sheet comprises a pair of superposed plates adjacent a front of said third camera and adapted to keep the sheet flat, each of said superposed plates having a slit to allow said third camera to check the quality of the sheet using transparency, said slit of each of said superposed plates being arranged perpendicularly to a direction of travel of the sheet.
(a) said means for transferring is adapted to transport the sheet in a plane and to enable said means for checking quality of the sheet to check a print quality of each of the first and second faces of the sheet in a single pass;
(b) said means for checking quality of the sheet comprises first and second cameras respectively located on opposite sides of the plane at two offset locations along the plane, said first camera being operative to check the print quality of the first face using reflection and said second camera being operative to check the print quality of the second face using reflection; and a third camera operative to check the quality of the sheet using transparency;
(c) said means for transferring the sheet comprises superposed transfer devices operative to allow travel of the sheet therebetween, said means for transferring defining a first open window adjacent a front of said first camera by having just one transfer device adjacent the front of said first camera and adapted to hold the sheet using suction truly in place facing said first camera, said means for transferring defining a second open window adjacent a front of said second camera by having just one transfer device adjacent the front of said second camera and adapted to hold the sheet using suction truly in place facing said second camera; and (d) said means for transferring the sheet comprises a pair of superposed plates adjacent a front of said third camera and adapted to keep the sheet flat, each of said superposed plates having a slit to allow said third camera to check the quality of the sheet using transparency, said slit of each of said superposed plates being arranged perpendicularly to a direction of travel of the sheet.
2. A quality control assembly as claimed in claim 1, wherein each of the first, second, and third cameras is a linear array camera.
3. A quality control assembly as claimed in claim 1 or 2, wherein at least one of the first open window and the second open window has a length corresponding to a fraction of the length of the sheet.
4. A quality control assembly as claimed in any one of claims 1 to 3, wherein said superposed transfer devices comprise superposed conveyor belt devices operative to allow travel of the sheet therebetween.
5. A quality control assembly as claimed in any one of claims 1 to 3, wherein said superposed transfer devices comprise superposed guide plates and pairs of rollers operative to allow travel of the sheet therebetween, said pairs of rollers being spaced from each other along the plane by a distance less than the length of the sheet.
6. A quality control assembly as claimed in any one of claims 1 to 5, further comprising means adjacent to the front of said third camera for guiding lateral edges of the sheet as the sheet passes between said superposed plates.
7. A quality control assembly as claimed in any one of claims 1 to 6, wherein said one transfer device adjacent the front of said first camera and adapted to hold the sheet using suction comprises holes each having an axis which is inclined relative to the plane, and said one transfer device adjacent the front of said second camera and adapted to hold the sheet using suction comprises holes each having an axis which is inclined relative to the plane.
8. A quality control assembly as claimed in claim 7, wherein the axis of each hole is inclined relative to the plane at an angle between 30° and 45°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI940198A IT1269506B (en) | 1994-02-04 | 1994-02-04 | QUALITY CONTROL SYSTEM OF SHEETS PRINTED IN PARTICULAR OF VALUE CARDS |
| ITMI94A000198 | 1994-02-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2141760A1 CA2141760A1 (en) | 1995-08-05 |
| CA2141760C true CA2141760C (en) | 2007-01-02 |
Family
ID=11367751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002141760A Expired - Fee Related CA2141760C (en) | 1994-02-04 | 1995-02-03 | Installation for quality control of printed sheets, especially security paper |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US5598006A (en) |
| EP (1) | EP0668577B1 (en) |
| JP (1) | JP3540411B2 (en) |
| KR (1) | KR100350717B1 (en) |
| CN (1) | CN1041561C (en) |
| AT (1) | ATE183323T1 (en) |
| AU (1) | AU679590B2 (en) |
| CA (1) | CA2141760C (en) |
| DE (1) | DE69511300T2 (en) |
| IT (1) | IT1269506B (en) |
| RU (1) | RU2150748C1 (en) |
| UA (1) | UA46695C2 (en) |
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| US7107200B1 (en) * | 2003-10-03 | 2006-09-12 | Sun Microsystems, Inc. | Method and apparatus for predicting clock skew for incomplete integrated circuit design |
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| US7199386B2 (en) * | 2004-07-29 | 2007-04-03 | General Electric Company | System and method for detecting defects in a light-management film |
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| US20100299978A1 (en) * | 2007-08-27 | 2010-12-02 | Bayer Materialscience Ag | Marking having electroluminescent lighting effect, method for the production thereof |
| EP2240333A2 (en) * | 2008-02-05 | 2010-10-20 | Bayer Technology Services GmbH | Security element |
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| JP5396660B2 (en) * | 2009-01-08 | 2014-01-22 | 独立行政法人 国立印刷局 | Print quality inspection system |
| DE102011012807A1 (en) * | 2010-08-31 | 2012-03-01 | Heidelberger Druckmaschinen Ag | Swiveling inspection device |
| EP2422973B1 (en) * | 2010-08-31 | 2013-06-05 | Heidelberger Druckmaschinen Aktiengesellschaft | Inspection module |
| EP2422969B1 (en) | 2010-08-31 | 2013-09-11 | Heidelberger Druckmaschinen AG | Folding box gluing machine |
| CN103313854A (en) | 2010-11-02 | 2013-09-18 | 卡巴-诺塔赛斯有限公司 | Device for irradiating substrate material in the form of a sheet or web and uses thereof |
| US20140208970A1 (en) * | 2011-08-22 | 2014-07-31 | Windmoeller & Hoelscher Kg | Machine and method for printing material webs |
| WO2013026792A1 (en) * | 2011-08-22 | 2013-02-28 | Windmöller & Hölscher Kg | Machine and method for printing webs of material |
| CN104155311A (en) * | 2014-08-08 | 2014-11-19 | 林小博 | Printing quality visual detection method |
| CN113103661A (en) | 2014-11-19 | 2021-07-13 | 鲍勃斯脱梅克斯股份有限公司 | Device for optically controlling the surface of a blank |
| DE102015006667A1 (en) * | 2015-05-22 | 2016-11-24 | Giesecke & Devrient Gmbh | Device for processing sheet material |
| CN105136811B (en) * | 2015-09-16 | 2018-03-06 | 西安印钞有限公司 | OVMI optics gradual change magnetic ink printing product on-line detecting system and method |
| CN106198552A (en) * | 2016-08-11 | 2016-12-07 | 牧德科技股份有限公司 | Detection device and testing process thereof |
| WO2023055564A1 (en) * | 2021-10-01 | 2023-04-06 | Sonoco Development, Inc. | Surface topography imaging system |
| DE102021212653A1 (en) * | 2021-11-10 | 2023-05-11 | OPTIMA life science GmbH | Apparatus, system and method for inspecting a web of material |
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| US4319137A (en) * | 1978-05-23 | 1982-03-09 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for identifying sheet-like printed matters |
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| AU556102B2 (en) * | 1981-10-22 | 1986-10-23 | Cubic Western Data | Currency note validator |
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| CH689523A5 (en) * | 1989-05-01 | 1999-05-31 | Mars Inc | Testing device for a blattfoermiges Good. |
| JPH0622186Y2 (en) * | 1990-10-11 | 1994-06-08 | 日本金銭機械株式会社 | Banknote identification sensor |
-
1994
- 1994-02-04 IT ITMI940198A patent/IT1269506B/en active IP Right Grant
-
1995
- 1995-01-11 AU AU10129/95A patent/AU679590B2/en not_active Ceased
- 1995-01-17 EP EP95810033A patent/EP0668577B1/en not_active Expired - Lifetime
- 1995-01-17 DE DE69511300T patent/DE69511300T2/en not_active Expired - Lifetime
- 1995-01-17 AT AT95810033T patent/ATE183323T1/en not_active IP Right Cessation
- 1995-01-19 US US08/374,889 patent/US5598006A/en not_active Expired - Lifetime
- 1995-01-27 CN CN95100193A patent/CN1041561C/en not_active Expired - Fee Related
- 1995-02-01 UA UA95028095A patent/UA46695C2/en unknown
- 1995-02-03 CA CA002141760A patent/CA2141760C/en not_active Expired - Fee Related
- 1995-02-03 RU RU95101841/12A patent/RU2150748C1/en not_active IP Right Cessation
- 1995-02-04 KR KR1019950001994A patent/KR100350717B1/en not_active IP Right Cessation
- 1995-02-06 JP JP01806795A patent/JP3540411B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| IT1269506B (en) | 1997-04-01 |
| AU679590B2 (en) | 1997-07-03 |
| KR950033474A (en) | 1995-12-26 |
| CN1117585A (en) | 1996-02-28 |
| ATE183323T1 (en) | 1999-08-15 |
| RU2150748C1 (en) | 2000-06-10 |
| KR100350717B1 (en) | 2003-05-17 |
| JP3540411B2 (en) | 2004-07-07 |
| CA2141760A1 (en) | 1995-08-05 |
| EP0668577A1 (en) | 1995-08-23 |
| US5598006A (en) | 1997-01-28 |
| JPH07318513A (en) | 1995-12-08 |
| EP0668577B1 (en) | 1999-08-11 |
| UA46695C2 (en) | 2002-06-17 |
| DE69511300D1 (en) | 1999-09-16 |
| CN1041561C (en) | 1999-01-06 |
| AU1012995A (en) | 1995-08-17 |
| ITMI940198A0 (en) | 1994-02-04 |
| ITMI940198A1 (en) | 1995-08-04 |
| DE69511300T2 (en) | 2000-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |