EP0541990A1 - Register control device in a rotary printing machine - Google Patents

Register control device in a rotary printing machine Download PDF

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Publication number
EP0541990A1
EP0541990A1 EP92117794A EP92117794A EP0541990A1 EP 0541990 A1 EP0541990 A1 EP 0541990A1 EP 92117794 A EP92117794 A EP 92117794A EP 92117794 A EP92117794 A EP 92117794A EP 0541990 A1 EP0541990 A1 EP 0541990A1
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EP
European Patent Office
Prior art keywords
row
strip
photosensitive elements
marks
circuit
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EP92117794A
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German (de)
French (fr)
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EP0541990B1 (en
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Patrick Monney
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Bobst Mex SA
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Bobst SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices

Definitions

  • the present invention relates to a device for controlling the register in a rotary printing machine, which device comprises a reading head of registration marks generally printed in the margin in order to detect possible offsets between the prints of each color, this device subsequently generating correction orders to act either on the path of the paper strip, or on the position of the corresponding plate cylinder.
  • CMOS complementary metal-oxide-semiconductor
  • CMOS complementary metal-oxide-semiconductor
  • the registration marks are here in the form of transverse lines of width substantially greater than the reading diameter of the photoelectric cell. For example, for a cell with a reading diameter of 6 mm, the width of the mark will be approximately 10 mm, thus leaving a clearance of 2 mm on both sides.
  • the marks are triangular and small, that is to say about a width of 3 mm for a length of 6 mm, in order to increase the surface of paper available for the 'impression.
  • the triangular appearance of these marks allows, by analysis of the departure and intensity of the pulse received, to determine both the longitudinal and lateral error of the corresponding impression.
  • the reading surface of the head is significantly reduced - of the order of a millimeter - it appears necessary to motorize the positioning in the lateral direction of this head in order to be able, if necessary, to catch up with an effect of a temporary shift of the web. This motorization of the movement of the head unfortunately involves a heavier structure which affects construction costs.
  • the object of the present invention is a device for controlling the register in a rotary printing machine capable of operating from the reading of particularly small marks, that is to say of the order of a square millimeter or less, which ensures as good a precision of the tracking control as the known devices, but which works fast enough to allow the tape running speeds much higher.
  • a device Preferably, such a device must be able to establish errors both longitudinally and laterally, either with marks side by side or with marks in succession according to the available space remaining on the strip of paper.
  • the design of this device must remain simple enough to allow it to be produced at a reasonable cost.
  • a register control device in a rotary printing machine, using a read head of printed registration marks, because the read head comprises a row of discrete photosensitive elements arranged along a transverse axis. when the strip travels in a plane situated above and parallel to this strip, followed, in this same plane, by a linear video strip parallel to the row of photosensitive elements.
  • This device further comprises a microprocessor selecting the photosensitive element used according to the momentary lateral offset of the strip and controlling the read operations of the linear video strip.
  • the row of discrete photosensitive elements can consist of around twenty surface-type photodiodes of about 0.7 mm 2 arranged approximately every millimeter.
  • a row of photodiodes is, for example, sold by the company Integrated Photomatrix Limited under the name IPL 10 220.
  • the linear video strip can be a CCD video component such as that sold by the company FAIRCHILD under the reference 145DC comprising 2,048 elements photosensitive over a width of 20 mm.
  • the advantage is that the photodiodes in the row are directly addressable and instantly send back a pulse when passing a mark, while the CCD linear video strip returns very precise information as to the lateral position of the passage of the mark.
  • the device comprises a second row of discrete photosensitive elements, arranged in parallel between the first row of discrete photosensitive elements and the linear video strip. Thanks to this arrangement, it becomes possible, with the same read head, to analyze marks side by side as well as marks which follow each other.
  • the microprocessor can be used to determine the running speed of the strip continuously from the detection of a mark successively by a discrete photosensitive element of the first then of the second row in order to trigger the bar.
  • linear video only when passing the mark under it.
  • the linear video bar working by integration of the light in time for a given lighting intensity, the triggering of this bar only at the right time allows to maintain a maximum contrast between the element or elements not lit by the presence of the mark and the other lit elements.
  • each row of discrete photosensitive elements is connected to a preamplification and multiplexing circuit controlled by the microprocessor for the selection of the discrete reading element used momentarily, circuit whose output is connected to an amplifier with selectable gain then to a ramp stiffening circuit to contrast the amplified pulse received during the passage of a mark under the selected photosensitive discrete element.
  • the output of the video signal from the preamplification and control circuit of the video module is connected to an amplification circuit with selectable gain, the output of which is connected to a ramp stiffening circuit to contrast the pulse received during the passage. of a mark under the bar, which pulse is re-applied to the microprocessor for the determination of the lateral position of the passage of the mark and reinitialization of the bar.
  • the plane in which the row or rows of discrete photosensitive elements and the video bar are located is set back from the strip of paper, a lens inserted between this strip and this plane projecting the image of the marks onto these photosensitive means.
  • the device described above is particularly advantageous insofar as the method of determining the register error from marks situated side by side consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each coming from almost simultaneously of one of the discrete photosensitive elements selected respectively in the right half and left half of the first or of the second row, and the lateral error by comparison of the centers of the different positions recorded almost simultaneously by the linear video bar .
  • the device described above is also particularly advantageous in that the method of determining the register error from marks located one behind the other consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each from one of the photosensitive elements selected respectively in the first and second row, the distance separating these two rows being equal to the expected distance between the two marks, and the lateral error by comparison of the centers of the positions, normally identical, recorded successively by the linear video module.
  • the device comprises a read head housing 17 equipped with a lens 18 and two light spots 15 placed on each side of the lens and illuminating an area 14 on a strip of paper 10 scrolling under this head 17.
  • On this strip of paper 10 are printed, as and when passing through the different color printing stations, or marks side by side 12, either marks following each other 11.
  • Behind the objective 18 are arranged in a plane parallel to the paper strip 10, two rows of photodiodes 20 and 21 and a linear video strip CCD 30 parallel to each other and transverse by relative to the direction of movement of the strip.
  • the focal length of the objective 18 and the distances between this objective and, on the one hand, the strip of paper 10 and, on the other hand, the reading elements 20, 21 and 30 are determined so that these elements receive a non-enlarged image, it being understood that, depending on the reading components 20, 21, 30 used, it may be preferable to modify these parameters to obtain a slight enlargement.
  • the rows of discrete photosensitive elements 20 and 21 are identical and are in the form of two components sold by the Company Integrated Photomatrix Limited under the name IPL 10 220. This component contains in a box a row of 22 elements of 0.66 mm2 each arranged every 1.08 mm. These two rows of photodiodes 20 and 21 are spaced apart from each other by a distance of the order of 20 mm corresponding to the normal difference provided between two marks following each other.
  • Each of the photodiodes in row 20 (21) is connected to one of the inputs of a multiplexer circuit 24 (25) by one of the connections of a bundle 22 (23). Circuits 24 and 25, commonly available commercially, include a preamplifier at each input, one of which outputs only is connected to a second amplification stage by a selection circuit controlled by the microprocessor 50.
  • the selected and preamplified pulse is then sent to a selectable gain amplifier circuit 26 (27), the gain of which is established, through the microprocessor 50, to compensate for the effects due to the shiny or matt appearance of the paper strip. or due to the more or less contrasted, or even equally brilliant, color of the registration marks.
  • the amplified pulse is then applied to a circuit 28 transforming the oblique flanks into steep flanks.
  • This type of ramp stiffening circuit known to a person skilled in the art, can comprise a first peak detection circuit whose value is slightly reduced by a resistance bridge before being applied to the positive terminal of a comparator, the negative terminal directly receiving the initial pulse. The comparator then switches abruptly when the offset of the pulse with respect to the base voltage is less then more than a predetermined value.
  • circuit 40 comparing the phase shift with particular reference to the middle of the pulses.
  • the linear video bar 30 consists of a row of 2,048 detector elements separated by stop channels and covered by a passivation layer of silicate dioxide. Photons pass through the layer of silicate dioxide and are absorbed into the individual silicate crystals creating pairs of holes and electrons. These electrons generated by photons are accumulated in photosensitive sites. The amount of charge accumulated in each photosensitive site is a linear function of the incident light intensity and the integration period.
  • An integration control terminal makes it possible to reduce and control the integration time of each photosensitive element.
  • the output signal varies continuously from a basic value corresponding to thermal agitation for zero illumination, up to a maximum of saturation corresponding to thermal agitation for intense lighting.
  • the component has two transfer doors adjacent to the rows of photosensitive elements.
  • the charge packets accumulated in the photosensitive elements are then transferred to the transport registers through these transfer gates, each time the voltage applied to the transfer terminal becomes high.
  • Load packets are transferred alternately to one of the two registers.
  • the transport registers are used to move the charge packets generated by the light in serial mode to a lateral amplifier.
  • a complementary relationship between the two transport registers makes it possible to reconstruct the initial chronology of the charge packets in order to constitute at the output a sequence of video lines.
  • a CCD charge coupled component is a semiconductor element in which discrete isolated charge packets are transported from one position in the semiconductor to an adjacent position by the sequential action of a row of doors. These charge packets are minority carriers with respect to the semiconductor substrate.
  • the video output 32 passes through a circuit 34 for preamplification and also for controlling the CCD, in particular for the start and end of integration tops, before being amplified in a circuit 36, the gain of which can be pre-established again according to the quality of the paper tape and / or the marks.
  • the video signal comprising one or two pulses is then applied to circuit 38 identical to circuits 28 and 29 making it possible to straighten and increase the contrast of the pulses present before being re-applied to the microprocessor 50 for analysis.
  • the device described above operates in the following manner, namely: In the case of detection marks 12 printed side by side as and when successive prints, the row of photodiodes 20 is virtually divided into two halves, the microprocessor selecting in the multiplexer 24 two diodes, one in each half, corresponding to the positions of the expected passages of the marks 12 as defined during an initialization phase or during previous measurements. If the prints are in register, the marks 12 are rigorously side by side and will influence their respective photodiodes simultaneously, causing the circuit 40 to observe no phase shift in the pulses in amplified slots. In the event of a print offset, a phase shift appears in the pulses received, making it possible to conclude in advance or in delay of the cylinder in question.
  • the marks 12 side by side pass almost simultaneously under the linear video strip 30, they each influence a distinct region of photosensitive elements resulting in two pulses in the output video signal, the difference can be precisely measured by the microprocessor from the midpoints of the amplified square pulses. This measurement can be performed, for example, using the number of pulses counted from an internal clock of the microprocessor triggered by a first pulse and then stopped by a second pulse.
  • the microprocessor 50 orders the multiplexers 24 and 25 to connect, in alignment, a photodiode of the strip 20 and 21 respectively.
  • these two arrays of photodiodes being equal to the expected spacing between the marks 11, the two selected photodiodes should generate a pulse simultaneously resulting, in the comparison circuit 40, again by the observation of a zero phase shift.
  • the measurement of the phase shift makes it possible to conclude in advance or in delay of the offending impression.
  • the linear video bar 30 reads the first mark 11 generating a first video signal, then resets to read the second mark.
  • the period required for this video module to perform a reading and then a reset being of the order of 500 micro-seconds with an internal operating clock of 4 MHz, it can completely read each of the brands which, in the in the case of a 20 mm spacing for a tape running speed of 20 m / s, follow each other at a millisecond interval.
  • the microprocessor compares the lateral position of each of the marks, which can be done in the form of a pulse count. a clock triggered by a start signal and stopped by the middle of the amplified square pulse representing the passage of this mark.
  • the device according to the invention can very easily detect particularly small mark position errors: less than or equal to one square millimeter, on a strip moving at high speed, this is that is to say at 20 m / s or more. Due to the fact that all fragile elements, in particular electronic detectors, can be enclosed inside a solid and waterproof housing 17 equipped with a lens and light spots, this device can withstand the constraints of the industrial environment. The majority of the optical, opto-electric or electronic components constituting this device being commercially available, the cost of its production remains reasonable. Many improvements can be made to this device in the context of this invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Record Information Processing For Printing (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Handling Of Sheets (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

The device comprises a reading head (17) for the reference marks (11, 12) printed on a band (tape) (10), which comprises a row (20) of separate photosensitive elements arranged, along an axis transverse to the progression of the band (tape) (10), in a plane situated above and parallel to this band (tape) (10), followed, in the same plane, by a linear video array (30) parallel to the row of photosensitive elements. The device further comprises a microproceser (50) intended to select the photosensitive element used as a function of the instantaneous lateral shift of the band (tape) and to control the reading operations of the linear video array (30). The reading head (17) may also comprise a second row (21) of separate photosensitive elements arranged parallel between the first row of separate photosensitive elements (20) and the linear video array (30). <IMAGE>

Description

La présente invention est relative à un dispositif de contrôle du registre dans une machine à imprimer rotative, lequel dispositif comprend une tête de lecture de marques de repérage imprimées généralement dans la marge afin de déceler des décalages éventuels entre les impressions de chaque couleur, ce dispositif générant par la suite des ordres de correction pour agir soit sur le chemin de la bande de papier, soit sur la position du cylindre porte-cliché correspondant.The present invention relates to a device for controlling the register in a rotary printing machine, which device comprises a reading head of registration marks generally printed in the margin in order to detect possible offsets between the prints of each color, this device subsequently generating correction orders to act either on the path of the paper strip, or on the position of the corresponding plate cylinder.

Des dispositifs connus de ce type, tel que celui décrit dans le document US 3,653,322, utilisent une tête de lecture comprenant une ou plusieurs photodiodes pour lire une marque passant dans une zone éclairée sous la tête. Afin de compenser des décalages latéraux imprévisibles inhérents à la vitesse de défilement importante de la bande de papier, les marques de repérage se présentent ici sous la forme de traits transversaux de largeur sensiblement plus importante que le diamètre de lecture de la cellule photoélectrique. Par exemple, pour une cellule ayant un diamètre de lecture de 6 mm, la largeur de la marque sera d'environ 10 mm pour laisser ainsi un jeu de 2 mm de part et d'autre.Known devices of this type, such as that described in document US Pat. No. 3,653,322, use a read head comprising one or more photodiodes to read a mark passing through an illuminated area under the head. In order to compensate for unpredictable lateral offsets inherent in the high speed of travel of the paper strip, the registration marks are here in the form of transverse lines of width substantially greater than the reading diameter of the photoelectric cell. For example, for a cell with a reading diameter of 6 mm, the width of the mark will be approximately 10 mm, thus leaving a clearance of 2 mm on both sides.

Dans un autre dispositif de ce type décrit dans le document EP 0 123 305, les marques sont triangulaires et petites, soit environ d'une largeur de 3 mm pour une longueur de 6 mm, afin d'augmenter la surface de papier disponible pour l'impression. L'aspect triangulaire de ces marques permet, par analyse du départ et de l'intensité de l'impulsion reçue, de déterminer à la fois l'erreur longitudinale et latérale de l'impression correspondante. Toutefois, quand bien même la surface de lecture de la tête est sensiblement réduite - de l'ordre du millimètre - il apparaît nécessaire de motoriser le positionnement dans le sens latéral de cette tête afin de pouvoir, le cas échéant, rattraper un effet d'un décalage temporaire de la bande. Cette motorisation du déplacement de la tête implique malheureusement une structure plus lourde se répercutant sur les frais de construction.In another device of this type described in the document EP 0 123 305, the marks are triangular and small, that is to say about a width of 3 mm for a length of 6 mm, in order to increase the surface of paper available for the 'impression. The triangular appearance of these marks allows, by analysis of the departure and intensity of the pulse received, to determine both the longitudinal and lateral error of the corresponding impression. However, even if the reading surface of the head is significantly reduced - of the order of a millimeter - it appears necessary to motorize the positioning in the lateral direction of this head in order to be able, if necessary, to catch up with an effect of a temporary shift of the web. This motorization of the movement of the head unfortunately involves a heavier structure which affects construction costs.

Comme on peut le constater, la recherche continuelle d'économie de place sur le papier par la réduction de la taille des marques de repérage, par exemple 1 mm de largeur seulement ou même moins, se heurte au problème des décalages latéraux des bandes d'amplitude supérieure à ces marques. Une motorisation avec d'aussi petites marques devient pratiquement impossible, celles-ci pouvant quitter trop rapidement le champ de lecture de la cellule photoélectrique avant même d'avoir pu en déterminer les dimensions. Par ailleurs, il n'est plus possible de donner à la marque aussi petite une forme particulière, tel qu'en triangle, pour effectuer simultanément une mesure dans le sens longitudinal et latéral.As can be seen, the continual search for saving space on paper by reducing the size of the registration marks, for example only 1 mm in width or even less, comes up against the problem of lateral offsets of the strips of amplitude greater than these marks. A motorization with such small marks becomes practically impossible, these being able to leave the reading field of the photocell too quickly before even having been able to determine the dimensions. Furthermore, it is no longer possible to give the mark so small a particular shape, such as in a triangle, to simultaneously perform a measurement in the longitudinal and lateral directions.

Les documents WO 86/05141 et WO 89/01867 proposent des solutions à partir de caméras vidéo prenant une image globale d'un groupe de marque pour, après analyse numérique de cette image, déterminer les erreurs de registre des différentes couleurs. Fonctionnant à satisfaction pour des impression à vitesses lentes, ces dispositifs trouvent rapidement leur limite pour des vitesses importantes, notamment dans l'impression hélio pour laquelle les vitesses de défilement de la bande papier peuvent atteindre 20 m/s. A cette vitesse, le traitement de l'image devrait pouvoir s'effectuer au moins dix fois plus rapidement qu'il n'est possible actuellement.The documents WO 86/05141 and WO 89/01867 propose solutions from video cameras taking a global image of a group of marks in order, after digital analysis of this image, to determine the registry errors of the different colors. Operating satisfactorily for printing at slow speeds, these devices quickly find their limit for high speeds, in particular in rotogravure printing for which the speed of movement of the paper web can reach 20 m / s. At this speed, image processing should be able to take place at least ten times faster than is currently possible.

Le but de la présente invention est un dispositif de contrôle du registre dans une machine à imprimer rotative pouvant fonctionner à partir de la lecture de marques particulièrement petites, c'est-à-dire de l'ordre du millimètre carré ou inférieur, qui assure une aussi bonne précision du contrôle du repérage que les dispositifs connus, mais qui fonctionne suffisamment rapidement pour autoriser des vitesses de défilement de la bande beaucoup plus importantes. De préférence, un tel dispositif doit être à même d'établir les erreurs aussi bien en longitudinal qu'en latéral, soit avec des marques côte à côte soit avec des marques à la suite selon la place disponible restant sur la bande de papier. Enfin, la conception de ce dispositif doit rester suffisamment simple pour en permettre la réalisation à un coût raisonnable.The object of the present invention is a device for controlling the register in a rotary printing machine capable of operating from the reading of particularly small marks, that is to say of the order of a square millimeter or less, which ensures as good a precision of the tracking control as the known devices, but which works fast enough to allow the tape running speeds much higher. Preferably, such a device must be able to establish errors both longitudinally and laterally, either with marks side by side or with marks in succession according to the available space remaining on the strip of paper. Finally, the design of this device must remain simple enough to allow it to be produced at a reasonable cost.

Ces buts sont réalisés grâce à un dispositif de contrôle du registre dans une machine à imprimer rotative, utilisant une tête de lecture de marques de repérage imprimées, du fait que la tête de lecture comprend une rangée d'éléments discrets photosensibles disposée selon un axe transversal au défilement de la bande dans un plan situé au-dessus et parallèle à cette bande, suivi, dans ce même plan, d'une barrette vidéo linéaire parallèle à la rangée d'éléments photosensibles. Ce dispositif comprend de plus un micro-processeur sélectionnant l'élément photosensible utilisé selon le décalage latéral momentané de la bande et pilotant les opérations de lecture de la barrette vidéo linéaire.These aims are achieved by means of a register control device in a rotary printing machine, using a read head of printed registration marks, because the read head comprises a row of discrete photosensitive elements arranged along a transverse axis. when the strip travels in a plane situated above and parallel to this strip, followed, in this same plane, by a linear video strip parallel to the row of photosensitive elements. This device further comprises a microprocessor selecting the photosensitive element used according to the momentary lateral offset of the strip and controlling the read operations of the linear video strip.

La rangée d'éléments discrets photosensibles peut être constituée d'une vingtaine de photodiodes de surface d'environ 0,7 mm2 disposées environ tous les millimètres. Une telle rangée de photodiodes est, par exemple, commercialisée par la Société Integrated Photomatrix Limited sous la dénomination IPL 10 220. La barrette vidéo linéaire peut être un composant vidéo CCD tel que celui commercialisé par la Société FAIRCHILD sous la référence 145DC comprenant 2 048 éléments photosensibles sur une largeur de 20 mm. L'avantage est que les photodiodes de la rangée sont adressables directement et renvoyent instantanément une impulsion lors du passage d'une marque, alors que la barrette vidéo linéaire CCD renvoye une information très précise quant à la position latérale du passage de la marque.The row of discrete photosensitive elements can consist of around twenty surface-type photodiodes of about 0.7 mm 2 arranged approximately every millimeter. Such a row of photodiodes is, for example, sold by the company Integrated Photomatrix Limited under the name IPL 10 220. The linear video strip can be a CCD video component such as that sold by the company FAIRCHILD under the reference 145DC comprising 2,048 elements photosensitive over a width of 20 mm. The advantage is that the photodiodes in the row are directly addressable and instantly send back a pulse when passing a mark, while the CCD linear video strip returns very precise information as to the lateral position of the passage of the mark.

Selon une autre forme d'exécution avantageuse, le dispositif comprend une seconde rangée d'éléments discrets photosensibles, disposée parallèlement entre la première rangée d'éléments discrets photosensibles et la barrette vidéo linéaire. Grâce à cet arrangement, il devient possible, avec une même tête de lecture, d'analyser aussi bien des marques côte à côte que des marques qui se suivent.According to another advantageous embodiment, the device comprises a second row of discrete photosensitive elements, arranged in parallel between the first row of discrete photosensitive elements and the linear video strip. Thanks to this arrangement, it becomes possible, with the same read head, to analyze marks side by side as well as marks which follow each other.

Utilement, le micro-processeur peut être mis à profit pour déterminer la vitesse de défilement de la bande en continu à partir de la détection d'une marque successivement par un élément discret photosensible de la première puis de la seconde rangée afin de déclencher la barrette vidéo linéaire uniquement lors du passage de la marque sous celle-ci. La barrette vidéo linéaire fonctionnant par intégration de la lumière dans le temps pour une intensité d'éclairage donnée, le déclenchement de cette barrette seulement au moment opportun permet de conserver un contraste maximum entre le ou les éléments non éclairés par la présence de la marque et les autres éléments éclairés.Usefully, the microprocessor can be used to determine the running speed of the strip continuously from the detection of a mark successively by a discrete photosensitive element of the first then of the second row in order to trigger the bar. linear video only when passing the mark under it. The linear video bar working by integration of the light in time for a given lighting intensity, the triggering of this bar only at the right time allows to maintain a maximum contrast between the element or elements not lit by the presence of the mark and the other lit elements.

Avantageusement, chaque rangée d'éléments discrets photosensibles est reliée à un circuit de préamplification et de multiplexage commandé par le micro-processeur pour la sélection de l'élément discret de lecture utilisé momentanément, circuit dont la sortie est reliée à un amplificateur à gain sélectionnable puis à un circuit raidisseur de rampe pour contraster l'impulsion amplifiée reçue lors du passage d'une marque sous l'élément discret photosensible sélectionné.Advantageously, each row of discrete photosensitive elements is connected to a preamplification and multiplexing circuit controlled by the microprocessor for the selection of the discrete reading element used momentarily, circuit whose output is connected to an amplifier with selectable gain then to a ramp stiffening circuit to contrast the amplified pulse received during the passage of a mark under the selected photosensitive discrete element.

Avantageusement encore, la sortie du signal vidéo du circuit de préamplification et de contrôle de la barrette vidéo est reliée à un circuit d'amplification à gain sélectionnable dont la sortie est branchée à un circuit raidisseur de rampe pour contraster l'impulsion reçue lors du passage d'une marque sous la barrette, laquelle impulsion est ré-appliquée au micro-processeur pour la détermination de la position latérale du passage de la marque et réinitialisation de la barrette.Advantageously also, the output of the video signal from the preamplification and control circuit of the video module is connected to an amplification circuit with selectable gain, the output of which is connected to a ramp stiffening circuit to contrast the pulse received during the passage. of a mark under the bar, which pulse is re-applied to the microprocessor for the determination of the lateral position of the passage of the mark and reinitialization of the bar.

Selon une disposition préférée, le plan dans lequel sont situées la ou les rangées d'éléments discrets photosensibles et la barrette vidéo se situe en retrait de la bande de papier, un objectif intercalé entre cette bande et ce plan projetant l'image des marques sur ces moyens photosensibles. Cette configuration permet d'installer aisément des moyens d'éclairage, tels que spots lumineux ou flashes synchronisés, pour bien éclairer la zone par laquelle doivent passer les marques de repérage.According to a preferred arrangement, the plane in which the row or rows of discrete photosensitive elements and the video bar are located is set back from the strip of paper, a lens inserted between this strip and this plane projecting the image of the marks onto these photosensitive means. This configuration makes it easy to install lighting means, such as light spots or synchronized flashes, to properly illuminate the area through which the registration marks must pass.

Le dispositif décrit précédemment est particulièrement intéressant dans la mesure où le procédé de détermination de l'erreur de registre à partir de marques situées côte à côte consiste à déterminer l'erreur longitudinale par la mesure du décalage éventuel entre les centres des deux impulsions issues chacune quasi-simultanément de l'un des éléments discrets photosensibles sélectionné respectivement dans la moitié droite et moitié gauche de la première ou de la deuxième rangée, et l'erreur latérale par comparaison des centres des différentes positions enregistrées quasi-simultanément par la barrette vidéo linéaire.The device described above is particularly advantageous insofar as the method of determining the register error from marks situated side by side consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each coming from almost simultaneously of one of the discrete photosensitive elements selected respectively in the right half and left half of the first or of the second row, and the lateral error by comparison of the centers of the different positions recorded almost simultaneously by the linear video bar .

Le dispositif décrit précédemment est également particulièrement intéressant en ce que le procédé de détermination de l'erreur de registre à partir de marques situées l'une derrière l'autre consiste à déterminer l'erreur longitudinale par la mesure du décalage éventuel entre les centres des deux impulsions issues chacune de l'un des éléments photosensibles sélectionné respectivement dans la première et seconde rangée, la distance séparant ces deux rangées étant égale à la distance attendue entre les deux marques, et l'erreur latérale par comparaison des centres des positions, normalement identiques, enregistrées successivement par la barrette vidéo linéaire.The device described above is also particularly advantageous in that the method of determining the register error from marks located one behind the other consists in determining the longitudinal error by measuring the possible offset between the centers of the two pulses each from one of the photosensitive elements selected respectively in the first and second row, the distance separating these two rows being equal to the expected distance between the two marks, and the lateral error by comparison of the centers of the positions, normally identical, recorded successively by the linear video module.

L'invention sera mieux comprise à l'étude d'un mode de réalisation pris à titre d'exemple nullement limitatif et illustré schématiquement sur la figure unique annexée.The invention will be better understood from the study of an embodiment taken by way of nonlimiting example and illustrated schematically in the attached single figure.

Le dispositif comprend un boîtier de tête de lecture 17 équipé d'un objectif 18 et de deux spots lumineux 15 placés de chaque côté de l'objectif et éclairant une zone 14 sur une bande de papier 10 défilant sous cette tête 17. Sur cette bande de papier 10 sont imprimées, au fur et à mesure du passage dans les différentes stations d'impression de couleurs, soit des marques côte à côte 12, soit des marques se suivant les unes derrière les autres 11. Derrière l'objectif 18 sont disposées dans un plan parallèle à la bande de papier 10, deux rangées de photodiodes 20 et 21 et une barrette vidéo linéaire CCD 30 parallèles entre elles et transversales par rapport au sens de déplacement de la bande.The device comprises a read head housing 17 equipped with a lens 18 and two light spots 15 placed on each side of the lens and illuminating an area 14 on a strip of paper 10 scrolling under this head 17. On this strip of paper 10 are printed, as and when passing through the different color printing stations, or marks side by side 12, either marks following each other 11. Behind the objective 18 are arranged in a plane parallel to the paper strip 10, two rows of photodiodes 20 and 21 and a linear video strip CCD 30 parallel to each other and transverse by relative to the direction of movement of the strip.

De préférence, la focale de l'objectif 18 et les distances entre cet objectif et, d'une part, la bande de papier 10 et, d'autre part, les éléments de lecture 20, 21 et 30 sont déterminés de telle sorte que ces éléments reçoivent une image non agrandie, étant bien entendu que, selon les composants de lecture 20, 21, 30 utilisés, il peut s'avérer préférable de modifier ces paramètres pour obtenir un léger agrandissement.Preferably, the focal length of the objective 18 and the distances between this objective and, on the one hand, the strip of paper 10 and, on the other hand, the reading elements 20, 21 and 30 are determined so that these elements receive a non-enlarged image, it being understood that, depending on the reading components 20, 21, 30 used, it may be preferable to modify these parameters to obtain a slight enlargement.

Les rangées d'éléments discrets photosensibles 20 et 21 sont identiques et se présentent sous la forme de deux composants commercialisés par la Société Integrated Photomatrix Limited sous la dénomination IPL 10 220. Ce composant contient dans un boîtier une rangée de 22 éléments de 0,66 mm2 chacun disposés tous les 1,08 mm. Ces deux rangées de photodiodes 20 et 21 sont espacées entre elles d'une distance de l'ordre de 20 mm correspondant à l'écart normal prévu entre deux marques se suivant 11. Chacune des photodiodes de la rangée 20 (21) est reliée à l'une des entrées d'un circuit multiplexeur 24 (25) par l'une des connexions d'un faisceau 22 (23). Les circuits 24 et 25, couramment disponibles dans le commerce, incluent un préamplificateur à chaque entrée dont l'une des sorties seulement est branchée à un deuxième étage d'amplification par un circuit de sélection contrôlé par le micro-processeur 50.The rows of discrete photosensitive elements 20 and 21 are identical and are in the form of two components sold by the Company Integrated Photomatrix Limited under the name IPL 10 220. This component contains in a box a row of 22 elements of 0.66 mm2 each arranged every 1.08 mm. These two rows of photodiodes 20 and 21 are spaced apart from each other by a distance of the order of 20 mm corresponding to the normal difference provided between two marks following each other. Each of the photodiodes in row 20 (21) is connected to one of the inputs of a multiplexer circuit 24 (25) by one of the connections of a bundle 22 (23). Circuits 24 and 25, commonly available commercially, include a preamplifier at each input, one of which outputs only is connected to a second amplification stage by a selection circuit controlled by the microprocessor 50.

L'impulsion sélectionnée et préamplifiée est ensuite envoyée dans un circuit amplificateur à gain sélectionnable 26 (27) dont le gain est établi, au travers du micro-processeur 50, pour compenser les effets dûs à l'aspect brillant ou mat de la bande papier ou dûs à la couleur plus ou moins contrastée, voire également brillante, des marques de repérage. L'impulsion amplifiée est ensuite appliquée à un circuit 28 transformant les flancs obliques en flancs raides. Ce type de circuit raidisseur de rampe, connu de l'homme du métier, peut comprendre un premier circuit de détection de pics dont la valeur est légèrement réduite par un pont de résistance avant d'être appliquée sur la borne positive d'un comparateur, la borne négative recevant directement l'impulsion initiale. Le comparateur bascule alors brutalement lorsque le décalage de l'impulsion par rapport à la tension de base est inférieur puis supérieur à une valeur prédéterminée.The selected and preamplified pulse is then sent to a selectable gain amplifier circuit 26 (27), the gain of which is established, through the microprocessor 50, to compensate for the effects due to the shiny or matt appearance of the paper strip. or due to the more or less contrasted, or even equally brilliant, color of the registration marks. The amplified pulse is then applied to a circuit 28 transforming the oblique flanks into steep flanks. This type of ramp stiffening circuit, known to a person skilled in the art, can comprise a first peak detection circuit whose value is slightly reduced by a resistance bridge before being applied to the positive terminal of a comparator, the negative terminal directly receiving the initial pulse. The comparator then switches abruptly when the offset of the pulse with respect to the base voltage is less then more than a predetermined value.

Les deux signaux, en créneaux de sortie des circuits 28 et 29 sont alors appliqués à un circuit 40 comparant le déphasage en se référant notamment au milieu des impulsions.The two signals, in output slots of circuits 28 and 29 are then applied to a circuit 40 comparing the phase shift with particular reference to the middle of the pulses.

La barrette vidéo linéaire 30 est constituée d'une rangée de 2 048 éléments détecteurs séparés par des canaux d'arrêt et couverts par une couche de passivation en dioxyde de silicate. Les photons passent au travers de la couche de dioxyde de silicate et sont absorbés dans les cristaux individuels de silicate créant des paires de trous et d'électrons. Ces électrons générés par les photons sont accumulés dans les sites photosensibles. La quantité de charge accumulée dans chaque site photosensible est une fonction linéaire de l'intensité lumineuse incidente et de la période d'intégration. Une borne de contrôle de l'intégration permet de réduire et de contrôler le temps d'intégration de chaque élément photosensible. Le signal de sortie varie de manière continue d'une valeur de base correspondant à l'agitation thermique pour une illumination nulle, jusqu'à un maximum de saturation correspondant à l'agitation thermique pour un éclairage intense.The linear video bar 30 consists of a row of 2,048 detector elements separated by stop channels and covered by a passivation layer of silicate dioxide. Photons pass through the layer of silicate dioxide and are absorbed into the individual silicate crystals creating pairs of holes and electrons. These electrons generated by photons are accumulated in photosensitive sites. The amount of charge accumulated in each photosensitive site is a linear function of the incident light intensity and the integration period. An integration control terminal makes it possible to reduce and control the integration time of each photosensitive element. The output signal varies continuously from a basic value corresponding to thermal agitation for zero illumination, up to a maximum of saturation corresponding to thermal agitation for intense lighting.

Le composant dispose de deux portes de transfert adjacentes aux rangées d'éléments photosensibles. Les paquets de charge accumulés dans les éléments photosensibles sont alors transférés vers les registres de transport au travers de ces portes de transfert, chaque fois que la tension appliquée à la borne de transfert devient haute. Les paquets de charge sont transférés alternativement sur l'un des deux registres. Les registres de transport sont employés pour déplacer les paquets de charge générés par la lumière en mode série à un amplificateur latéral. Une relation de complémentarité entre les deux registres de transport permet de reconstituer la chronologie initiale des paquets de charge pour constituer en sortie une séquence de lignes vidéo.The component has two transfer doors adjacent to the rows of photosensitive elements. The charge packets accumulated in the photosensitive elements are then transferred to the transport registers through these transfer gates, each time the voltage applied to the transfer terminal becomes high. Load packets are transferred alternately to one of the two registers. The transport registers are used to move the charge packets generated by the light in serial mode to a lateral amplifier. A complementary relationship between the two transport registers makes it possible to reconstruct the initial chronology of the charge packets in order to constitute at the output a sequence of video lines.

En d'autres termes, un composant à couplage de charge CCD est un élément semi-conducteur dans lequel des paquets de charge isolés discrets sont transportés d'une position dans le semi-conducteur dans une position adjacente par l'action séquentielle d'une rangée de portes. Ces paquets de charge sont des porteurs minoritaires par rapport au substrat du semi-conducteur.In other words, a CCD charge coupled component is a semiconductor element in which discrete isolated charge packets are transported from one position in the semiconductor to an adjacent position by the sequential action of a row of doors. These charge packets are minority carriers with respect to the semiconductor substrate.

La sortie vidéo 32 passe au travers d'un circuit 34 de préamplification et également de contrôle du CCD notamment pour les tops de départ et de fin d'intégration, avant d'être amplifiée dans un circuit 36 dont le gain peut être pré-établi à nouveau selon la qualité de la bande papier et/ou des marques. Le signal vidéo comprenant une ou deux impulsions est alors appliqué au circuit 38 identique aux circuits 28 et 29 permettant de redresser et augmenter le contraste des impulsions présentes avant d'être ré-appliqué au micro-processeur 50 pour analyse.The video output 32 passes through a circuit 34 for preamplification and also for controlling the CCD, in particular for the start and end of integration tops, before being amplified in a circuit 36, the gain of which can be pre-established again according to the quality of the paper tape and / or the marks. The video signal comprising one or two pulses is then applied to circuit 38 identical to circuits 28 and 29 making it possible to straighten and increase the contrast of the pulses present before being re-applied to the microprocessor 50 for analysis.

Le dispositif décrit précédemment fonctionne de la manière suivante, soit :
   Dans le cas de marques de détection 12 imprimées côte à côte au fur et à mesure des impressions successives, la rangée de photodiodes 20 est virtuellement divisée en deux moitiés, le micro-processeur sélectionnant dans le multiplexeur 24 deux diodes, une dans chaque moitié, correspondantes aux positions des passages attendus des marques 12 tel que cela est défini lors d'une phase d'initialisation ou lors de mesures précédentes. Si les impressions sont en registre, les marques 12 sont rigoureusement côte à côte et vont influencer leurs photodiodes respectives simultanément, faisant que le circuit 40 ne constatera aucun déphasage dans les impulsions en créneaux amplifiés. En cas de décalage des impression, un déphasage apparaît alors dans les impulsions reçues permettant de conclure à l'avance ou au retard du cylindre incriminé. Lorsque les marques 12 côte à côte passent quasi-simultanément sous la barrette vidéo linéaire 30, elles influencent chacune une région distincte d'éléments photosensibles se traduisant par deux impulsions dans le signal vidéo de sortie dont l'écart peut être mesuré avec précision par le micro-processeur à partir des milieux des impulsions carrées amplifiées. Cette mesure peut être effectuée, par exemple, en utilisant le nombre d'impulsions comptées d'une horloge interne du micro-processeur déclenchée par une première impulsion puis arrêtée par une seconde impulsion.The device described above operates in the following manner, namely:
In the case of detection marks 12 printed side by side as and when successive prints, the row of photodiodes 20 is virtually divided into two halves, the microprocessor selecting in the multiplexer 24 two diodes, one in each half, corresponding to the positions of the expected passages of the marks 12 as defined during an initialization phase or during previous measurements. If the prints are in register, the marks 12 are rigorously side by side and will influence their respective photodiodes simultaneously, causing the circuit 40 to observe no phase shift in the pulses in amplified slots. In the event of a print offset, a phase shift appears in the pulses received, making it possible to conclude in advance or in delay of the cylinder in question. When the marks 12 side by side pass almost simultaneously under the linear video strip 30, they each influence a distinct region of photosensitive elements resulting in two pulses in the output video signal, the difference can be precisely measured by the microprocessor from the midpoints of the amplified square pulses. This measurement can be performed, for example, using the number of pulses counted from an internal clock of the microprocessor triggered by a first pulse and then stopped by a second pulse.

Dans le cas de deux marques se suivant l'une derrière l'autre 11, le micro-processeur 50 ordonne aux multiplexeurs 24 et 25 de brancher, dans l'alignement, une photodiode respectivement de la barrette 20 et 21. L'écartement de ces deux barrettes de photodiodes étant égal à l'écartement attendu entre les marques 11, les deux photodiodes sélectionnées devraient générer une impulsion simultanément se traduisant, dans le circuit de comparaison 40, à nouveau par la constatation d'un déphasage nul. Dans le cas contraire, la mesure du déphasage permet de conclure à l'avance ou au retard de l'impression incriminée.In the case of two brands following one behind the other 11, the microprocessor 50 orders the multiplexers 24 and 25 to connect, in alignment, a photodiode of the strip 20 and 21 respectively. these two arrays of photodiodes being equal to the expected spacing between the marks 11, the two selected photodiodes should generate a pulse simultaneously resulting, in the comparison circuit 40, again by the observation of a zero phase shift. In the opposite case, the measurement of the phase shift makes it possible to conclude in advance or in delay of the offending impression.

Pour la mesure du décalage latéral, la barrette vidéo linéaire 30 lit la première marque 11 générant un premier signal vidéo, puis se réinitialise pour lire la seconde marque. La période nécessaire à cette barrette vidéo pour effectuer une lecture puis une réinitialisation étant de l'ordre de 500 micro-secondes avec une horloge interne de fonctionnement de 4 MHz, elle peut tout-à-fait lire séparément chacune des marques qui, dans le cas d'un écartement de 20 mm pour une vitesse de défilement de la bande de 20 m/s, se suivent à une milliseconde d'intervalle. Le micro-processeur compare alors la position latérale de chacune des marques ce qui peut s'effectuer sous la forme d'un comptage d'impulsions d'une horloge déclenchée par un top de départ et arrêtée par le milieu de l'impulsion carrée amplifiée représentant le passage de cette marque.For the measurement of the lateral offset, the linear video bar 30 reads the first mark 11 generating a first video signal, then resets to read the second mark. The period required for this video module to perform a reading and then a reset being of the order of 500 micro-seconds with an internal operating clock of 4 MHz, it can completely read each of the brands which, in the in the case of a 20 mm spacing for a tape running speed of 20 m / s, follow each other at a millisecond interval. The microprocessor then compares the lateral position of each of the marks, which can be done in the form of a pulse count. a clock triggered by a start signal and stopped by the middle of the amplified square pulse representing the passage of this mark.

Comme on a pu le constater à la lecture de cet exposé, le dispositif selon l'invention peut très facilement détecter les erreurs de position de marque particulièrement petites : inférieures ou égales au millimètre carré, sur une bande défilant à grande vitesse, c'est-à-dire à 20 m/s voire plus. Du fait que tous les éléments fragiles, notamment les détecteurs électroniques, peuvent être enfermés à l'intérieur d'un boîtier 17 solide et étanche équipé d'un objectif et de spots lumineux, ce dispositif peut supporter les contraintes du milieu industriel. La majorité des composants optiques, opto-électriques ou électroniques constituant ce dispositif étant disponibles dans le commerce, le coût de sa réalisation reste raisonnable. De nombreuses améliorations peuvent être apportées à ce dispositif dans le cadre de cette invention.As we have seen on reading this presentation, the device according to the invention can very easily detect particularly small mark position errors: less than or equal to one square millimeter, on a strip moving at high speed, this is that is to say at 20 m / s or more. Due to the fact that all fragile elements, in particular electronic detectors, can be enclosed inside a solid and waterproof housing 17 equipped with a lens and light spots, this device can withstand the constraints of the industrial environment. The majority of the optical, opto-electric or electronic components constituting this device being commercially available, the cost of its production remains reasonable. Many improvements can be made to this device in the context of this invention.

Claims (8)

Dispositif de contrôle du registre dans une machine à imprimer rotative utilisant une tête de lecture de marques de repérage (11, 12) imprimées sur la bande (10), caractérisé en ce que la tête de lecture (17) comprend une rangée (20) d'éléments discrets photosensibles disposée selon un axe transversal au défilement de la bande dans un plan situé au-dessus et parallèle à cette bande, suivi, dans ce même plan, d'une barrette vidéo linéaire (30) parallèle à la rangée d'éléments photosensibles; et en ce que ce dispositif comprend un micro-processeur (50) sélectionnant l'élément photosensible utilisé selon le décalage latéral momentané de la bande et pilotant les opérations de lecture de la barrette vidéo linéaire.Register control device in a rotary printing machine using a read head of registration marks (11, 12) printed on the strip (10), characterized in that the read head (17) comprises a row (20) discrete photosensitive elements arranged along an axis transverse to the running of the strip in a plane situated above and parallel to this strip, followed, in this same plane, by a linear video bar (30) parallel to the row of photosensitive elements; and in that this device comprises a microprocessor (50) selecting the photosensitive element used according to the momentary lateral offset of the strip and controlling the read operations of the linear video strip. Dispositif selon la revendication 1, caractérisé en ce que la tête de lecture (17) comprend une seconde rangée (21) d'éléments discrets photosensibles disposée parallèlement entre la première rangée d'éléments discrets photosensibles (20) et la barrette vidéo linéaire (30).Device according to claim 1, characterized in that the read head (17) comprises a second row (21) of discrete photosensitive elements arranged in parallel between the first row of discrete photosensitive elements (20) and the linear video strip (30 ). Dispositif selon la revendication 2, caractérisé en ce que le micro-processeur (50) détermine la vitesse de défilement de la bande (10) à partir de la détection d'une marque successivement par un élément photosensible de la première (20) puis de la seconde (21) rangée afin de déclencher la barrette vidéo linéaire (30) juste lors du passage de la marque sous celle-ci.Device according to claim 2, characterized in that the microprocessor (50) determines the speed of travel of the strip (10) from the detection of a mark successively by a photosensitive element of the first (20) and then from the second (21) row in order to trigger the linear video bar (30) just when the mark passes under it. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que chaque rangée (20) d'éléments discrets photosensibles est reliée à un circuit de préamplification et de multiplexage (24) commandé par le micro-processeur (50) pour la sélection de l'élément de lecture utilisé momentanément, circuit dont la sortie est reliée à un amplificateur à gain sélectionnable (26) puis à un circuit raidisseur de rampe (28) pour contraster l'impulsion amplifiée reçue lors du passage d'une marque sous l'élément photosensible sélectionné.Device according to one of claims 1 to 3, characterized in that each row (20) of discrete photosensitive elements is connected to a preamplification and multiplexing circuit (24) controlled by the microprocessor (50) for the selection of the reading element used momentarily, a circuit the output of which is connected to a selectable gain amplifier (26) then to a ramp stiffening circuit (28) to contrast the amplified pulse received when passing a mark under the selected photosensitive element. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que la sortie du signal vidéo du circuit (34) de préamplification et de contrôle de la barrette vidéo (30) est reliée à un circuit d'amplification à gain sélectionnable (36) dont la sortie est branchée à un circuit raidisseur de rampe (38) pour contraster l'impulsion reçue lors du passage d'une marque sous la barrette, laquelle impulsion est ré-appliquée au micro-processeur (50).Device according to one of Claims 1 to 4, characterized in that the output of the video signal from the circuit (34) for preamplification and control of the video bar (30) is connected to an amplification circuit with selectable gain (36 ) whose output is connected to a ramp stiffening circuit (38) to contrast the pulse received during the passage of a mark under the bar, which pulse is re-applied to the microprocessor (50). Dispositif selon l'une des revendications précédentes, caractérisé en ce que le plan dans lequel sont situées la ou les rangées (20, 21) d'éléments photosensibles et la barrette vidéo (30) est en retrait de la bande (10), un objectif (18) intercalé entre cette bande et ce plan projetant l'image des marques (11, 12) passant dans une zone éclairée (14) par des moyens (15) inclus dans la tête (17) sur les rangées d'éléments photosensibles et la barrette vidéo.Device according to one of the preceding claims, characterized in that the plane in which the row or rows (20, 21) are located of photosensitive elements and the video bar (30) is set back from the strip (10), a objective (18) interposed between this strip and this plane projecting the image of the marks (11, 12) passing through an illuminated area (14) by means (15) included in the head (17) on the rows of photosensitive elements and the video bar. Procédé de détermination de l'erreur de registre à partir de marques (12) situées côte à côte utilisant le dispositif selon la revendication 1, caractérisé en ce que l'on détermine l'erreur longitudinale par la mesure du décalage éventuel entre les centres des deux impulsions issues chacune quasi-simultanément de l'un des éléments discrets photosensibles sélectionné respectivement dans la moitié droite et moitié gauche de la rangée (20), et l'erreur latérale par comparaison des centres des différentes positions enregistrées quasi-simultanément par la barrette vidéo linéaire (30).Method for determining the register error from marks (12) located side by side using the device according to claim 1, characterized in that the longitudinal error is determined by measuring the possible offset between the centers of the two pulses each coming almost simultaneously from one of the discrete photosensitive elements selected respectively in the right half and left half of the row (20), and the lateral error by comparison of the centers of the different positions recorded almost simultaneously by the linear video bar (30). Procédé de détermination de l'erreur de registre à partir de marques (11) situées l'une derrière l'autre utilisant le dispositif selon la revendication 2, caractérisé en ce que l'on détermine l'erreur longitudinale par la mesure du décalage éventuel entre les centres des deux impulsions issues chacune de l'un des éléments photosensibles sélectionné respectivement dans la première (20) et seconde (21) rangée, la distance séparant ces deux rangées étant égale à la distance attendue entre les deux marques (11), et l'erreur latérale par comparaison des centres des positions, normalement identiques, enregistrées successivement par la barrette vidéo linéaire.Method for determining the register error from marks (11) located one behind the other using the device according to claim 2, characterized in that the longitudinal error is determined by measuring the possible offset between the centers of the two pulses each coming from one of the photosensitive elements selected respectively in the first (20) and second (21) row, the distance separating these two rows being equal to the expected distance between the two marks (11), and the lateral error by comparison of the centers of the positions, normally identical, recorded successively by the linear video strip.
EP92117794A 1991-11-14 1992-10-19 Register control device in a rotary printing machine Expired - Lifetime EP0541990B1 (en)

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CH3318/91 1991-11-14
CH331891A CH686501A5 (en) 1991-11-14 1991-11-14 Dispositif de contrale du registre dans une machine a imprimer rotative.

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EP0541990B1 EP0541990B1 (en) 1996-03-20

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EP (1) EP0541990B1 (en)
JP (1) JPH0742041B2 (en)
AT (1) ATE135635T1 (en)
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Also Published As

Publication number Publication date
ES2084239T3 (en) 1996-05-01
US5329466A (en) 1994-07-12
CA2082717C (en) 1997-02-18
JPH05294551A (en) 1993-11-09
CA2082717A1 (en) 1993-05-15
DE69209233T2 (en) 1996-09-05
EP0541990B1 (en) 1996-03-20
CH686501A5 (en) 1996-04-15
DK0541990T3 (en) 1996-08-05
DE69209233D1 (en) 1996-04-25
ATE135635T1 (en) 1996-04-15
JPH0742041B2 (en) 1995-05-10

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