EP0680909A1 - Méthode et dispositif pour contrôler la similarité de feuilles en particulier de feuilles imprimées - Google Patents

Méthode et dispositif pour contrôler la similarité de feuilles en particulier de feuilles imprimées Download PDF

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Publication number
EP0680909A1
EP0680909A1 EP95810282A EP95810282A EP0680909A1 EP 0680909 A1 EP0680909 A1 EP 0680909A1 EP 95810282 A EP95810282 A EP 95810282A EP 95810282 A EP95810282 A EP 95810282A EP 0680909 A1 EP0680909 A1 EP 0680909A1
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EP
European Patent Office
Prior art keywords
sheet
binary
values
zones
input
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.)
Withdrawn
Application number
EP95810282A
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German (de)
English (en)
Inventor
Rene Zens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grapha Holding AG
Original Assignee
Grapha Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grapha Holding AG filed Critical Grapha Holding AG
Publication of EP0680909A1 publication Critical patent/EP0680909A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • B65H7/14—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 by photoelectric feelers or detectors
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/60—Optical characteristics, e.g. colour, light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/20—Calculating means; Controlling methods
    • B65H2557/24—Calculating methods; Mathematic models
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/50—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves
    • B65H2557/512—Use of particular electromagnetic waves, e.g. light, radiowaves or microwaves infrared
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/60—Details of processes or procedures
    • B65H2557/63—Optimisation, self-adjustment, self-learning processes or procedures, e.g. during start-up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/60—Details of processes or procedures
    • B65H2557/64—Details of processes or procedures for detecting type or properties of handled material

Definitions

  • the present invention relates to a method for checking the equality of sheets, in particular printed sheets, in which a region of each sheet conveyed is opto-electrically scanned and measured values of the sheets derived therefrom are compared with one another. Furthermore, the invention relates to a device for performing this method with at least one photo sensor, which is arranged directly on the sheet drawn from a stack.
  • Print sheets are unfolded or two- to multi-page, folded paper sheets.
  • a brochure for example, they are gathered together on saddle stitching or bookbinding machines and provided with a binding or inserted into a product. Depending on the number of folds of a printed sheet, it comprises four, eight, sixteen, thirty-two, etc. pages.
  • the stacked printed sheets are separated for the production of a brochure by the feeder of the inserting, saddle stitching or bookbinding machine and there usually by means of a rotating gripper drum. During the separation, the gripper drum detects the lowest or the closest sheet of the stack in a magazine in a certain rotational position and pulls it away from the stack. Stacking magazine and gripper drum are part of a feeder.
  • one or more feeders are set up along a saddle or channel-shaped collecting section.
  • Such investors are known from CH-PS 374 968 and US-PS 3 199 862.
  • a reliable separation of single sheets is also necessary with other graphic machines, such as sheet printing machines and the like.
  • DE-OS 38 06 125 discloses a method for detecting incorrectly created bridge sheets, in which the printed sheets held in position on the take-off drum of the collating machine are guided past an opto-electrical scanning device. Its light spot is aligned with a defined query field of a striking area of a first printed sheet in a defined angle of rotation range of the take-off drum. The following printed sheets are queried in this rotation angle range. When a deviation of the distinctive area is determined, a control pulse is triggered to stop the collating machine or to emit a signal.
  • This known method has the disadvantage of being faulty if the printed sheets are not in the correct position.
  • an optical scanning device for recording an image or a partial area of the image of the printed sheet. Portions of the image of a reference that are shifted against one another are stored and compared with the scanned portion of the current printed sheet and correlated arithmetically. A decision circuit generates a if they do not match corresponding signal.
  • This known system does require a lower positional accuracy of the printed sheets; however, it has the disadvantage of being complex and expensive.
  • the present invention sets itself the goal of being able to recognize false sheets quickly and reliably with a large tolerance with regard to positional errors or folding deviations without producing an image of the sheets.
  • the method according to the invention has the features stated in the characterizing part of patent claim 1.
  • the device according to the invention for carrying out the method is characterized by the features specified in claim 17.
  • a feeder 1 essentially has a stack magazine 2 with a stack of printed sheets 3 and a gripper drum 5 formed from parallel disks 4.
  • the front of the magazine 2 is delimited by a stop plate 6 which is oriented at right angles to a base plate 7.
  • the stop plate 6 and the base plate 7 leave a gap 8 through which the gripper drum 5 pulls the bottom sheet 3 ′ from the stack 3.
  • the preceding edge of the bottom sheet of the stack 3 in each case is pivoted into the effective area of the gripper drum 5 by swivel suction cups, not shown, and is gripped and taken along by its clock-controlled grippers 9.
  • the grippers 9 release the printed sheet 3 'again after a little more than half a turn of the gripper drum 5, so that the printed sheet 3' is thrown onto a collecting section 10 running underneath and is collected there with further printed sheets from subsequent feeders to form a brochure.
  • a photo sensor 12 is attached to a rod 11 parallel to the gap 8 in the path of the lowest printed sheet 3 ′ from the stack 3 to the gripper drum 5.
  • the printed sheet 3 'runs over the rod 11 and thus also over the photo sensor 12, namely at a short distance of about 0.5 mm.
  • the photo sensor 12 is a reflection sensor that works with infrared light that it emits itself.
  • the photo sensor 12 is slidably arranged on the rod 11. As mentioned further below, several photo sensors can also be attached to the rod 11.
  • the photo sensor 12 serves to scan the printed sheet 3 'removed from the stack 3 and fed to the gripper drum 5 zone by zone along a line in its conveying direction and to emit an electrical signal for each zone scanned in this way.
  • a zone is defined as a short distance of the printing sheet 3 ′ in its conveying direction, the zone having a length of, for example, 2 to 8 mm and a width of approximately 0.5 mm. If this respective zone has a dark pressure, that is to say a pressure below a certain gray level or a certain color level, it is regarded as “dark” and identified with a signal "1". Conversely, if the zone has a lighter print above the certain level or is not printed at all, it is considered “bright” and identified with a signal "0".
  • a full scan of the printing sheet 3 ' consists of the successive scanning of a certain number of zones, for example 32 zones, in the conveying direction of the printing sheet 3'.
  • This sequential, zone-by-zone scanning accordingly provides a successive series of signals which have the value "1" or "0” depending on the brightness of the respective zones.
  • a number of successive signals of the same value "1” or "0” is referred to below as a group or as a dark or light group.
  • Fig. 3 shows a simple but typical example of the result of a scan over a certain distance in the conveying direction of a printed sheet.
  • a zone length of 5 mm is selected, and in total the scanning takes place over 32 consecutive zones.
  • the signal values "1" and "0" determined in the zones according to the above information for the present example are shown.
  • the beginning of each zone is shown in a grid.
  • the grid lines each correspond to a zone length of 5 mm.
  • the dark and light groups obtained along the scanning line according to the above definition in the present example are shown.
  • the following series of signal values are therefore obtained for a zone length of 5 mm: 11111100000001111111111111111111 or in other words: 6 signal values "1", followed by 7 signal values "0", which are followed by 19 signal values "1".
  • a test value can be determined on the basis of one or more identical reference printed sheets, with which the measured values of the printed sheets to be checked during operation can subsequently be compared in order to be able to quickly and reliably identify defective printed sheets in the event of deviations.
  • the initial selection of a line to be scanned on a printed sheet can be done by moving the photo sensor 12 on the rod 11 according to FIGS. 1 and 2 and fixing it in a suitable position.
  • the aim is to scan a printed line zone by zone which is characteristic of the printed sheet to be checked and which therefore differs significantly from scanning lines of other printed sheets.
  • a series of photo sensors can also be arranged on the rod 11, one of which is electrically selected in a suitable position.
  • the choice of an inexpensive scanning line is particularly important when several printed sheets contain different text, but present a very similar printed image. In such a case, it is advisable to move the scan line to the end line of a text paragraph. Shorter zones should be used for small text blocks. Empty edges of the printed sheets are not suitable for the zone-wise scanning described. If there are completely black images on the print sheet, it is advantageous to use a light spot or light spot as a feature.
  • the device shown which is, for example, a circuit board containing the components described below, has an input 15. 1 and 2 or one of the photo sensors 12 is connected to the input 15 if a plurality of these are arranged on the rod 11, as has already been mentioned.
  • a photo amplifier 16 can also be connected to the input line of the device.
  • the input signal possibly amplified by the photo amplifier 16, is fed to the input of a detector 17, which is designed as a Schmitt trigger and is used to determine whether the size of the input signal corresponds to a light or a dark area of the scanned printed sheet 3 '.
  • a binary signal "1" occurs, for example, at the output of the detector 17 when the input signal or the photo sensor 12 indicates a transition from light to dark.
  • the output of the detector 17 is connected to the set input 18 of a flip-flop 19.
  • the flip-flop 19 also has two outputs 20 and 21, a reset input 22 and a release input 23 in a known manner.
  • a control logic 24 is connected to the enable input.
  • a release signal emitted by the control logic 24 activates the flip-flop 19 so that the measuring process described later can start.
  • the output 20 of the flip-flop 19 is connected to the enable input 25 of a shift register 26 with, for example, 32 stages, while the output 21 of the flip-flop 19 is connected to the enable input 27 of a presettable binary counter 28 with, for example, also 32 counting stages.
  • a signal appears at the outputs 20 and 21, which the shift register 26 and the Binary counter 28 releases.
  • the device shown has a further input 29, to which a clock signal is fed.
  • the frequency of the clock signal determines, as can be seen from the following functional description, the sampling frequency for the printed sheet 3 'by the Photo sensor 12 or, in other words, the length of the scan zones.
  • the clock signals are expediently generated by a pulse generator 30, preferably by a counter, which is fed by an encoder disk which is permanently driven by the processing machine.
  • the clock signals are fed to the counter input 31 of the binary counter 28 and then also to the clock input 32 of the shift register 26.
  • the progressive counting of the clock pulses in the binary counter 28 reaches the set count range, a signal occurs at its output 33, which reaches the reset input 22 of the flip-flop 19.
  • the measurement signal coming from the photo sensor 12 and amplified by the photo amplifier 16 is furthermore in the present device the input of a further Schmitt trigger 34, which has a similar function to the Schmitt trigger 17 and the setting of the sensitivity of the device with regard to the gray levels on the printed sheet 3 'serves.
  • the output of the Schmitt trigger 34 is connected to the serial data input 35 of the shift register 26.
  • the latter also has a parallel output 36 and a preselection input 37.
  • the functioning of the device shown is as follows, starting from the example mentioned above, according to which the scanning takes place in a scanning sequence over a total of 32 zones.
  • the binary counter 28 is thus preset to 32 bits.
  • the switching threshold of the Schmitt trigger 34 is set in accordance with the desired gray scale discrimination.
  • a photo sensor 12 is connected to the input 15 of the device and that the flip-flop 19 is activated by an enable signal from the control logic 24, the flip-flop 19 is set when the detector 17 makes a first transition from light to dark on the Moving, scanned printed sheet 3 'and outputs a signal "1" to the flip-flop 19. If there is no printed sheet, of course nothing happens.
  • a signal "1" also appears at its output 20, which releases the shift register 26.
  • the binary counter 28 is released by the signal "1" of the flip-flop output 21 fed to its enable input 27.
  • the signal of the input 15 passes through the photo amplifier 16 to the input of the Schmitt trigger 34.
  • the Schmitt trigger 34 now emits a signal "0" when the brightness at the scanned point of the printed sheet 3 ' is greater than the brightness corresponding to the switching threshold or a signal "1" if the brightness is lower.
  • the signals of the Schmitt trigger 34 in the shift register 26 are continuously shifted further (to the right), while the clock pulses are continuously counted in the binary counter 28.
  • the flip-flop 19 remains set, since it is known that it is not reset when the output signal of the detector 17 changes from "1" to "0” at its set input 18 in accordance with a transition from dark to light.
  • the binary counter 28 As soon as the binary counter 28 has reached the set count range, in this case 32 bits, it outputs a signal at its output 33 which resets the flip-flop 19. So the signals arrive its outputs 20 and 21 to the "0" level, so that both the shift register 26 and the binary counter 28 are blocked and reset. In the same way, a new scanning sequence of 32 zones is started.
  • the signal A shows the signal A on the enable line from the flip-flop output 20 to the shift register input 25 and the signal B on the output line of the Schmitt trigger 34. From this it can be seen that the signal A detects the arrival of a sheet at the location of the photo sensor 12 and triggers the measurement or terminates the measurement when the last zone (here the 32nd zone) has been measured.
  • the signal B represents the zone measured values during this sampling period. These measured values appear for each sampling period as a parallel signal at the output 36 of the shift register 26.
  • the data output 36 and the preselection input 37 of the shift register 26 and a control input 38 of the control logic 24 of the device in FIG. 4 are connected via a multiplex channel 39 to a computer 40, preferably a microcomputer.
  • the connection of the device shown to the computer 40 is a multiplex channel, because the same devices of FIG. 4 of other feeders of the type of the feeder 1 shown in FIGS. 1 and 2 are also connected to the computer 40.
  • the computer 40 is designed to determine and store the test value already mentioned for each feeder 1 in FIG. 1 on the basis of the measured values.
  • the procedure for checking the equality of arcs comprises the following steps.
  • the suitable position of the photo sensor 12 on the relevant rod 11 is determined for each feeder, or the suitable one is selected for a plurality of photo sensors.
  • the zone length, ie the pulse frequency of the clock signals, is then determined.
  • a subsequent learning phase approximately 5 to 20 printed sheets 3 'are scanned from the stack magazines 2 (FIGS. 1, 2) of each feeder 1 in the manner described, the measured values being fed to the computer 40 via the respective device in FIG. 4. These measured values are stored in the computer 40 and evaluated to form the test value mentioned. Computer 40 also compares each investor's measurement pattern to that of all other investors. If the difference in the test values between two different investors is less than, for example, 25%, the computer 40 terminates the learning phase via the control logic 24, since if the test values of the several investors differ slightly, the sheets of one investor can be confused with those of another investor. To remedy this deficiency, the photo sensor 12 can be moved, or another photo sensor can be selected, or the zone length can finally be set differently.
  • the learning phase is then started again.
  • the respective measured value patterns and test values can also be displayed graphically on a screen.
  • the test values should have a value of at least 80% in order to be able to reliably recognize the equality of the printed sheets. For example, the test value will have an unusually low value if the photo sensor is located over the essentially empty side edge of the printed sheet.
  • the system is ready for production with the determined or saved values.
  • the data determined by the computer 40 for the sheets of the product in question can also be stored on a floppy disk under an appropriate name. This makes it possible to abort the recognition process here and to continue it at any time by loading the diskette data into the computer 40.
  • the actual operating phase can be carried out, in which the equality of all printed sheets is checked for each or selected one of the several feeders.
  • individual controls can be actively set or switched off by the computer 40 sending a corresponding control signal to the preselection input 37 of the shift register 26. This is the case, for example, if the relevant feeder is not used or the sheet is not to be checked.
  • the printed sheets of all or the selected feeders are scanned in the manner described and the measured values obtained are sent to the computer 40. There they or their test values are compared with the stored data, whereby a certain criterion of agreement is determined. Since the test values take the course of a Gaussian curve, the bandwidth can be used to determine which deviation from the maximum of the curve still signals equality or which deviation from the wrong printed sheet.
  • Blank pages or 32 measured values zero in the present example always represent a bad product. Such bad products can, if the deviations occur only occasionally and rarely, be automatically sorted out due to the detected deviation during further processing.
  • a scanning zone was defined as a short distance of the printing sheet in its conveying direction, the zone having a length of, for example, 2 to 8 mm and a width of approximately 0.5 mm.
  • the type area is not always in the exact same place on a press sheet; rather, depending on the setting of the printing press or the cutting apparatus, certain dislocations that are smaller per se can result. If the photo sensor described is now set up on a print line to check the equality of the sheets, it may be that, due to line-shaped scanning, an identical print sheet, but with a slightly offset type area, is being read between two adjacent print lines or on another print line . This means that no reliable statement about the equality or inequality of the printed sheets can be obtained, even if certain deviation tolerances are permitted in the evaluation described below.
  • a photo sensor which detects the printed image scans a larger width, so that fluctuations in the type area are recorded and thus an appropriate print sheet control is achieved.
  • semiconductor photo sensors are commercially available which have a width of, for example, 8 mm and a total of, for example, 64 picture elements or pixels over this width.
  • a photo sensor is, for example, the integrated TSL214 opto-sensor from Texas Instruments, which contains 64 pixels in a linear arrangement and internal logic with a shift register.
  • TSL214 opto-sensor from Texas Instruments, which contains 64 pixels in a linear arrangement and internal logic with a shift register.
  • clock pulses from a clock generator and start signals In order to obtain analog scanning signals for a scanning line, such a module only requires an operating supply, clock pulses from a clock generator and start signals.
  • the scanning field has the configuration of the above Photo sensor a width of 8 mm.
  • the scanning field in the conveying direction of the printing sheet, should have a length of 90 mm, with a scanning cycle, that is to say the scanning of the printing sheet along a scanning line of 8 mm length, triggered by a corresponding control signal each time the printing sheet is conveyed shall be.
  • the 64 digital scanning signals P1 to P64 are shown in FIG. 7 for the first five scanning clocks or scanning lines T1 to T5. Since the above-mentioned photo sensor delivers scanning pulses with analog amplitude at its output, these output signals are fed to a threshold circuit, preferably with an adjustable threshold value, in order to be able to determine the two binary values "0" for light scanning points and "1" for dark sampling points. These digitized scanning signals are shown in FIG. It can be seen that the binary signals of clocks T1 to T5 in FIG. 7 match the criteria "light / dark” along the scan lines of 1 to 5 mm in length in FIG. 6.
  • a first data reduction is now carried out by combining 8 consecutive scanning signals P1 to P8, P9 to P16 etc. with the help of an OR logic to form a group which forms 1 bit of a byte B1.
  • the bit resulting from the logic operation has the logical value "1” if at least one of the scanning signals combined in the group has the logical value "1", that is to say if at least one of the 8 pixels is dark.
  • the resulting bit has the logical value "0” if all 8 pixels are bright.
  • the bytes B1 to B5 of the scan lines T1 to T5 shown are accordingly composed of 8 bits b1 to b8, which are either "1” or "0", which is indicated in FIG. 8 by hatched blocks.
  • a further, second data reduction is then carried out by forming a new block byte BB1 etc. with 8 bits bb1 to bb8 from three consecutive bytes 1 to 3 etc., again using an OR logic according to the same criteria as at the first data reduction.
  • Bit bb1 has the logical value "0" only if all bits b1 of bytes B1 to B3 have the logical value "0".
  • the same decision is made by the OR logic for the further bits bb2 to bb8.
  • the resulting block byte BB1 of the sampling clocks T1 to T3 with the 8 bits bb1 to bb8 is shown in FIG. 9.
  • the number of block bytes generated is merely an example and depends on the present transmission conditions.
  • FIGS. 10 and 11 Illustrative representations of the described formation of bytes 1 to 90 (FIG. 8) or block bytes BB1 to BB30 (FIG. 9) with respect to the text section scanned on the printed sheet (FIG. 6) are shown in FIGS. 10 and 11 .
  • the hatched squares and rectangles represent the respective bits b and bb with the logical value "1".
  • the photo sensor 12 there is displaceably arranged on a rod 11 transversely to the conveying direction of the printing sheet 3 ', so that one for the scanning can be set to a suitable location on the printed sheet. From the schematic representation of FIG. 12 it can be seen that a similar arrangement of the photo sensor and an electronic device for displacing the area to be scanned on the printed sheet are also provided in connection with the variant of the present method.
  • the photo sensor 12 is displaceably arranged on the rod 11 according to the arrow shown.
  • the photo sensor 12 here is a semiconductor photo sensor with a width of 8 mm, for example, which has a total of 64 pixels or picture elements.
  • a photocell 41 is also attached to the delivery side of the individual printed sheets drawn from the stack.
  • the photo sensor 12 and the photo cell 41 are connected to a decoder 42.
  • a tachometer 43 is also connected to the decoder 42, which outputs to the decoder 42 pulses with a frequency proportional to the machine speed, for example one pulse per millimeter of the sheet feed.
  • the photocell 41 determines the start of the first printed sheet delivered from the stack and delivers a corresponding start signal to the decoder 42.
  • the pulses from the tachometer 43 are used to optionally activate the photo sensor 12 relative to the start of the movement of the printed sheet by a certain, adjustable amount To delay route 44.
  • the decoder 42 has an adjusting element 45.
  • the area 46 scanned in the course of the method, for example 8 mm ⁇ 90 mm on the printed sheet, can be viewed on a graphic display device 47 of the decoder 42, cf. Fig. 11.
  • the image can appear shifted by about 3 to 4 mm on both sides; however, the beginning and length of at least one section of text will always be visible.
  • the setting of the scanning area at any point on the printed sheet to be checked is advantageously carried out on the shortest possible closing line of a text paragraph on the printed sheet or on a typical image or a typical gap in order to check whether at least in one of the 8 bit rows short parts or the corresponding pattern is determined.
  • FIG. 13 shows the block diagram of a device with a processor 48, which performs the function of the decoder 42 of FIG. 12 and performs the data reduction according to FIG. 6.
  • the photocell 41 of FIG. 12 is connected to one of several inputs of the processor 48.
  • the semiconductor photo sensor 12 is connected to corresponding inputs of the processor 48 via two lines 49 and 50.
  • the tachometer 43 of FIG. 12 is connected to a further input of the processor 48.
  • the clock pulses of a clock generator 49 are fed to the processor 48 at a frequency of, for example, 500 kHz.
  • the photocell 41 triggers a signal which is fed to the decoder contained in the processor 48 (cf. FIG. 12). After the set delay time, the processor 48 emits a start signal SS to the photo sensor 12 via line 49 to activate it.
  • the photo sensor 12 supplies measurement signals MS to the processor 48 via the line 50, in which a threshold circuit generates the binary signals of FIG. 7.
  • An OR logic in the processor 48 first forms the byte B1 according to FIG. 8 and then the other bytes B2 to B90.
  • An OR logic also contained in the processor 48 forms the first block byte BB1 of FIG. 8, which is output via an output line 52 of the processor 48 to an evaluation device, not shown, for example a computer. This Processes are repeated for all further scan lines until (in the present example) 30 block bytes BB1 to BB30 have been sent to the computer, whereupon the photo sensor 12 is deactivated until the next printed sheet arrives.
  • the evaluation of the measurement results can be based on various algorithms. For example, it can be determined how long the shortest line is in one of the 8 bit rows, whereby this length can be compared with a stored value. Such a check can be refined by checking how many transitions from light to dark occur in the bit row under consideration or how long is the longest dark or light streak in the bit row.
  • the learning phase already described is initially carried out using a plurality of printed sheets, or the stored data is loaded, whereupon the actual operating phase is carried out, in which the checking of the equality of all printed sheets is carried out for each of several investors. But also in the operating phase, adjustments regarding the scanned text or the evaluation in the computer are possible, if it should show that individual print sheets are not correctly recorded.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
EP95810282A 1994-05-03 1995-04-28 Méthode et dispositif pour contrôler la similarité de feuilles en particulier de feuilles imprimées Withdrawn EP0680909A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH137294 1994-05-03
CH1372/94 1994-05-03

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EP0680909A1 true EP0680909A1 (fr) 1995-11-08

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EP95810282A Withdrawn EP0680909A1 (fr) 1994-05-03 1995-04-28 Méthode et dispositif pour contrôler la similarité de feuilles en particulier de feuilles imprimées

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JP (1) JPH0859021A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355056A1 (fr) * 2010-01-29 2011-08-10 Glory Ltd. Appareil de reconnaissance de feuilles de papier et procédé de reconnaissance de feuilles de papier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436449A1 (fr) * 1978-09-14 1980-04-11 Nielsen A C Co Procede et installation pour l'exploration automatique d'une image en vue de son identification
EP0078708A2 (fr) * 1981-11-03 1983-05-11 De La Rue Systems Limited Dispositif pour trier des feuilles en fonction de leurs dessins
GB2132756A (en) * 1982-12-17 1984-07-11 Laurel Bank Machine Co Paper sheet discriminating apparatus
DE3806125A1 (de) * 1988-02-26 1989-09-07 Kolbus Gmbh & Co Kg Verfahren zum erkennen von falsch angelegten druckbogen in einer zusammentragmaschine
US5065440A (en) * 1990-03-09 1991-11-12 Eastman Kodak Company Pattern recognition apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436449A1 (fr) * 1978-09-14 1980-04-11 Nielsen A C Co Procede et installation pour l'exploration automatique d'une image en vue de son identification
EP0078708A2 (fr) * 1981-11-03 1983-05-11 De La Rue Systems Limited Dispositif pour trier des feuilles en fonction de leurs dessins
GB2132756A (en) * 1982-12-17 1984-07-11 Laurel Bank Machine Co Paper sheet discriminating apparatus
DE3806125A1 (de) * 1988-02-26 1989-09-07 Kolbus Gmbh & Co Kg Verfahren zum erkennen von falsch angelegten druckbogen in einer zusammentragmaschine
US5065440A (en) * 1990-03-09 1991-11-12 Eastman Kodak Company Pattern recognition apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2355056A1 (fr) * 2010-01-29 2011-08-10 Glory Ltd. Appareil de reconnaissance de feuilles de papier et procédé de reconnaissance de feuilles de papier

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