EP0119138B1 - Method of correcting register deviations in printing devices - Google Patents

Method of correcting register deviations in printing devices Download PDF

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Publication number
EP0119138B1
EP0119138B1 EP19840400459 EP84400459A EP0119138B1 EP 0119138 B1 EP0119138 B1 EP 0119138B1 EP 19840400459 EP19840400459 EP 19840400459 EP 84400459 A EP84400459 A EP 84400459A EP 0119138 B1 EP0119138 B1 EP 0119138B1
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Prior art keywords
length
web
path
expressed
printing
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German (de)
French (fr)
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EP0119138A1 (en
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Henri Duport
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CYBEREXACT
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CYBEREXACT
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Priority claimed from FR8303935A external-priority patent/FR2542255B1/en
Priority claimed from FR8315988A external-priority patent/FR2553033B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices

Definitions

  • the present invention relates to a method for correcting registration differences on printing devices of a band to be printed in movement at least slightly elastic, in particular printing presses, comprising a number of printing stations defining, each, a printing line, in which, for a tracking difference ( ⁇ o ) measured at a first printing station, the length of the strip path is modified, for a determined point on the strip, between the line of the first station and the printing line of a second printing station disposed immediately upstream thereof, of a length greater than this difference ⁇ o , in which, after having modified the length of the path of tape in a first direction, it is modified again and without stopping time in a second opposite direction.
  • ⁇ o tracking difference
  • Printing presses comprise a certain number of printing stations, or groups, each comprising a printing or engraved cylinder, or a transfer or transfer cylinder on offset presses, for example, and a pressure roller, defining both a print line. It is sometimes noted that the impressions of a station and the previous station, on a tape to be printed, preferably fed from a reel, are not in agreement or do not coincide. They are said to not spot each other and that there is a tracking difference.
  • French patent 1,117,477 teaches more particularly to reverse the modification of the length of the strip path, but after an arbitrary exceeding of the measured difference and after a downtime.
  • the tracking difference during this downtime certainly decreases, but at a relatively lower speed, which can only lead to a too long lost strip length.
  • Swiss patent 539 509 for its part, teaches more particularly to calculate a tension value of the strip as a function of the tracking difference measured, and to maintain the tension of the strip equal to this value throughout the duration of the correction. However, it is planned to reach this voltage instantaneously, which is not a simple implementation.
  • the present invention therefore aims to overcome the drawbacks of the methods of the prior art.
  • the present invention relates first of all to a method of the type mentioned above, characterized in that the modification of the length of the strip path in the first direction is carried out at maximum speed of the means for modifying the length of the path of the strip during the travel of a first portion of strip of length m ; , and the modification of the length of the strip path in the second opposite direction takes place at maximum speed of the modification means, during the travel of a second portion of strip of length (m o - m i ), up to that the final modification of the length of the course is equal to the tracking difference measured s o , and from a position of the modification means in the second direction such that the final modification ⁇ o of the course is carried out with the cancellation of the tracking difference, m o and m i being given by the system of equations where e is the base of natural logarithms and k and K of constants.
  • the length of lost tape is minimal.
  • the tape in question can be cut from a reel, but this is not a process limitation in this case.
  • a tracking difference having therefore been observed between two adjacent printing stations and measured, of a length ⁇ o (FIG. 1b), is started, at maximum speed V, the servo-motor of the roller. register to drive it in a direction beyond the position r o in which it modifies the length of the strip path of ⁇ o ( Figure 1a), in the species represented by increasing it.
  • the register roller is driven to an intermediate position r i until the strip has passed, from the start of the correction, by a length m i which will be defined later.
  • the law of variation of the tracking difference ⁇ is such that the slope of the derivative increases, with, in ⁇ i , a relatively strong derivative slope.
  • the reason for this character of the law during the movement of the register is due to the fact that it does not reach the position r i , or even the position r o , instantaneously.
  • the reason for the steep slope of the law at the end of the movement of the register is that it moves at full speed. It will also be noted that the larger this initial difference, the steeper the slope.
  • the register is in the position where it modified the length of the tape path by a length equal to s o and the tracking difference is zero, so that from this moment, or for the following strip lengths, the marking is maintained.
  • e is the base of natural logarithms, whose value is equal to 2.718.
  • L is the strip length between the two printing lines of the two stations concerned, expressed in meters (m). It is constant, except for the variation in length, which is second order and therefore negligible.
  • ⁇ o is the initial tracking error measured, expressed in millimeters (mm).
  • v is the given speed of the strip expressed in meters per second (m - s -1 ).
  • V is the given linear speed of the action of the register expressed in millimeters per second (mm - s- ').
  • m o is given by the formula where a, b and c are constants and K the ratio ⁇ o v / N
  • b is the length L defined above and a and c are constants for example equal to 2 and 0.2 respectively.
  • the register is driven at maximum speed only to a position r e (FIG. 2a), the strip having then passed by a length m e and the locating difference e having passed from ⁇ o to ⁇ e (FIG. 2b).
  • the curve ⁇ again changes according to an exponential law.
  • the register is in the position where it modified the length of the course of the strip by a length equal to e o and the tracking difference is zero, so that from this moment, and for the following strip lengths, the tracking is maintained, as before.
  • P max The two values of P max mentioned above can be manually entered into the computer or the microprocessor. They depend on the nature of the material to be printed, and in particular on its coefficient of elasticity, the dimensions of the printing cylinders used, the tension under which the strip is introduced into the first printing station, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Description

La présente invention concerne un procédé de correction d'écarts de repérage sur les dispositifs d'impression d'une bande à imprimer en mouvement au moins légèrement élastique, notamment les rotatives d'imprimerie, comprenant un certain nombre de postes d'impression définissant, chacun, une ligne d'impression, dans lequel, pour un écart de repérage (εo) mesuré à un premier poste d'impression, on modifie la longueur du parcours de la bande, pour un point déterminé de la bande, entre la ligne d'impression du premier poste et la ligne d'impression d'un deuxième poste d'impression disposé immédiatement en amont de celui-ci, d'une longueur supérieure à cet écart εo, dans lequel, après avoir modifié la longueur du parcours de bande dans un premier sens, on la modifie à nouveau et sans temps d'arrêt dans un deuxième sens inverse.The present invention relates to a method for correcting registration differences on printing devices of a band to be printed in movement at least slightly elastic, in particular printing presses, comprising a number of printing stations defining, each, a printing line, in which, for a tracking difference (ε o ) measured at a first printing station, the length of the strip path is modified, for a determined point on the strip, between the line of the first station and the printing line of a second printing station disposed immediately upstream thereof, of a length greater than this difference ε o , in which, after having modified the length of the path of tape in a first direction, it is modified again and without stopping time in a second opposite direction.

Les rotatives d'imprimerie comportent un certain nombre de postes, ou groupes, d'impression, comprenant chacun, un cylindre imprimeur ou gravé, ou un cylindre de transfert ou de report sur les rotatives offset, par exemple, et un rouleau presseur, définissant tous deux une ligne d'impression. On constate parfois que les impressions d'un poste et du poste précédent, sur une bande à imprimer, alimentée de préférence depuis une bobine, ne sont pas en concordance ou ne coïncident pas. On dit qu'elles ne repèrent pas entre elles et qu'il y a un écart de repérage.Printing presses comprise a certain number of printing stations, or groups, each comprising a printing or engraved cylinder, or a transfer or transfer cylinder on offset presses, for example, and a pressure roller, defining both a print line. It is sometimes noted that the impressions of a station and the previous station, on a tape to be printed, preferably fed from a reel, are not in agreement or do not coincide. They are said to not spot each other and that there is a tracking difference.

Pour pallier ce défaut, il est nécessaire de modifier la longueur du parcours de la bande entre les deux lignes d'impression des postes concernés, pour un point déterminé de la bande.To overcome this defect, it is necessary to modify the length of the strip path between the two printing lines of the stations concerned, for a determined point on the strip.

A cet effet, on peut soit décaler, à l'aide de différentiels, le cylindre imprimeur du poste aval, en l'entraînant de façon appropriée en rotation depuis son calage angulaire normal, soit et de préférence, en modifiant directement de façon appropriée la longueur du parcours de la bande entre les deux lignes d'impression, à l'aide d'au moins un rouleau registre, ou compensateur.For this purpose, it is possible either to offset, using differentials, the printing cylinder of the downstream station, by driving it in appropriate manner in rotation from its normal angular setting, or and preferably, by directly modifying in an appropriate manner the length of the web path between the two printing lines, using at least one register roller, or compensator.

Il se pose toutefois un problème, dans la mesure où dès qu'on s'aperçoit de l'écart de repérage et qu'on actionne par exemple, le rouleau registre, les impressions ne repèrent à nouveau qu'après le défilement d'une certaine portion de bande à imprimer, qui est donc perdue. En d'autres termes, entre le moment de l'action correctrice et le moment où l'erreur est corrigée, la bande a quand même défilé.There is however a problem, insofar as as soon as one realizes the tracking deviation and that one actuates for example, the register roller, the impressions do not locate again until after the scrolling of a certain portion of the tape to be printed, which is therefore lost. In other words, between the time of the corrective action and the time when the error was corrected, the tape still ran.

Un procédé du type mentionné ci-dessus est notamment décrit ou illustré dans les brevets français 1 117477 et suisse 539 509.A process of the type mentioned above is notably described or illustrated in French patents 1,117,477 and Swiss patents 539,509.

Le brevet français 1 117477 enseigne plus particulièrement d'inverser la modification de la longueur du parcours de bande, mais après un dépassement arbitraire de l'écart mesuré et après un temps d'arrêt. Il en résulte que l'écart de repérage pendant ce temps d'arrêt certes diminue, mais à une vitesse relativement plus faible, ce qui ne peut que conduire à une longueur de bande perdue trop longue.French patent 1,117,477 teaches more particularly to reverse the modification of the length of the strip path, but after an arbitrary exceeding of the measured difference and after a downtime. As a result, the tracking difference during this downtime certainly decreases, but at a relatively lower speed, which can only lead to a too long lost strip length.

Le brevet suisse 539 509, quant à lui, enseigne plus particulièrement de calculer une valeur de tension de la bande en fonction de l'écart de repérage mesuré, et de maintenir la tension de la bande égale à cette valeur pendant toute la durée de la correction. Toutefois, il y est prévu d'atteindre cette tension de façon instantanée, ce qui n'est pas d'une mise en oeuvre simple.Swiss patent 539 509, for its part, teaches more particularly to calculate a tension value of the strip as a function of the tracking difference measured, and to maintain the tension of the strip equal to this value throughout the duration of the correction. However, it is planned to reach this voltage instantaneously, which is not a simple implementation.

Par ailleurs, le brevet américain 2 866 407 enseigne une première modification dans un sens au delà de l'écart mesuré, suivie, et sans temps d'arrêt, d'une seconde modification dans le sens inverse, et d'une troisième modification dans le premier sens, l'écart de repérage étant annulé après la cessation de la troisième modification. Mais ici encore, la mise en oeuvre de ce procédé entraîne une longueur de bande perdue trop importante.In addition, American patent 2,866,407 teaches a first modification in one direction beyond the measured difference, followed, and without stopping time, by a second modification in the opposite direction, and by a third modification in the first direction, the tracking difference being canceled after the cessation of the third modification. But here again, the implementation of this method results in an excessively long lost tape length.

La présente invention vise donc à pallier les inconvénients des procédés de l'art antérieur.The present invention therefore aims to overcome the drawbacks of the methods of the prior art.

A cet effet, la présente invention concerne tout d'abord un procédé du type mentionné ci-dessus, caractérisé par le fait que la modification de la longueur du parcours de bande dans le premier sens s'effectue à vitesse maximale des moyens de modification de la longueur du parcours de la bande pendant le défilement d'une première portion de bande de longueur m;, et la modification de la longueur du parcours de bande dans le second sens inverse s'effectue à vitesse maximale des moyens de modification, pendant le défilement d'une seconde portion de bande de longueur (mo - mi), jusqu'à ce que la modification finale de la longueur du parcours soit égale à l'écart de repérage mesuré so, et depuis une position des moyens de modification dans le second sens telle que la modification finale εo du parcours soit réalisée avec l'annulation de l'écart de repérage, mo et mi étant données par le système d'équations

Figure imgb0001
Figure imgb0002
où e est la base des logarithmes népériens et k et K des constantes.To this end, the present invention relates first of all to a method of the type mentioned above, characterized in that the modification of the length of the strip path in the first direction is carried out at maximum speed of the means for modifying the length of the path of the strip during the travel of a first portion of strip of length m ; , and the modification of the length of the strip path in the second opposite direction takes place at maximum speed of the modification means, during the travel of a second portion of strip of length (m o - m i ), up to that the final modification of the length of the course is equal to the tracking difference measured s o , and from a position of the modification means in the second direction such that the final modification ε o of the course is carried out with the cancellation of the tracking difference, m o and m i being given by the system of equations
Figure imgb0001
Figure imgb0002
 where e is the base of natural logarithms and k and K of constants.

Grâce au procédé de l'invention, la longueur de bande perdue est minimale.Thanks to the method of the invention, the length of lost tape is minimal.

Toutefois, et dans la pratique, une telle mise en oeuvre du procédé pourrait conduire, pendant le parcours aller du registre, si pendant toute la modification de la longueur du parcours de bande, sa vitesse restait maximale, et ce, pour des valeurs basses de la vitesse de la bande et des valeurs élevées de l'écart de repérage, à raccourcir la longueur du parcours de bande pendant qu'il ne défile qu'assez peu de mètres de bande, jusqu'à provoquer l'annulation de la tension de la bande et donc un « flottement » de la bande.However, and in practice, such an implementation of the method could lead, during the forward course of the register, if during the entire modification of the length of the strip course, its speed remained maximum, and this, for low values of the speed of the tape and the high values of the tracking difference, to shorten the length of the tape run while it does not run very fast of meters of strip, until causing the tension of the strip to be canceled and therefore a "floating" of the strip.

Or, on ne peut pas accepter de bande flottante, car celle-ci ne serait plus convenablement conduite, ou guidée et, en outre, le déplacement du registre n'aurait plus d'action sur l'évolution de l'écart de repérage.However, we can not accept a floating strip, because it would no longer be properly driven, or guided and, moreover, the movement of the register would no longer have an action on the evolution of the tracking difference.

Inversement, il pourrait aussi en résulter un allongement du parcours de bande pendant le défilement de peu de mètres de bande, et donc une augmentation de la tension de la bande, au point d'en provoquer la rupture, ou le glissement qui ferait encore échapper l'évolution de l'écart de repérage au contrôle du registre, par sa position.Conversely, it could also result in an elongation of the strip path during the running of a few meters of strip, and therefore an increase in the tension of the strip, to the point of causing it to break, or slip which would still make it escape. the evolution of the tracking error in register control, by its position.

Aussi, la présente invention concerne également un procédé du type mentionné ci-dessus, caractérisé par le fait que la modification de la longueur du parcours de bande dans le premier sens s'effectue d'abord à vitesse maximale des moyens de modification de la longueur du parcours de la bande pendant le défilement d'une première portion de bande de longueur me puis, et sans temps d'arrêt, à vitesse réduite pendant le défilement d'une seconde portion de bande de longueur (m, - me), et la modification de la longueur du parcours de bande dans le second sens inverse s'effectue à vitesse maximale des moyens de modification pendant le défilement d'une troisième portion de bande de longueur (m'o - m,), jusqu'à ce que la modification finale de la longueur du parcours soit égale à l'écart de repérage mesuré eo, et depuis une position des moyens de modification dans le second sens telle que la modification finale ε0 du parcours soit réalisée avec l'annulation de l'écart de repérage, me, mr et m'o étant données par les équations

Figure imgb0003
Figure imgb0004
Figure imgb0005
où

  • me, mr et m'o sont exprimés en mètres,
  • log est le logarithme népérien,
  • L est la longueur de bande entre les deux lignes d'impression exprimée en mètres,
  • v est la vitesse de la bande exprimée en m · s-1,
  • V est la vitesse maximale des moyens de variation de la longueur du parcours de bande, exprimée en mm . s-1,
  • Pmax est la valeur maximale autorisée de la dérivée de/dm exprimée en mm · m-1.
Also, the present invention also relates to a method of the type mentioned above, characterized in that the modification of the length of the strip path in the first direction is first carried out at maximum speed of the length modification means of the path of the strip during the travel of a first portion of strip of length m e then, and without stopping time, at reduced speed during the travel of a second portion of strip of length (m, - m e ) , and the modification of the length of the strip path in the second opposite direction takes place at maximum speed of the modification means during the travel of a third portion of strip of length (m ' o - m,), up to that the final modification of the length of the path is equal to the tracking difference measured e o , and from a position of the modification means in the second direction such that the final modification ε 0 of the path is carried out with the cancellation of tracking error, m e , m r and m ' o being given by the equations
Figure imgb0003
Figure imgb0004
Figure imgb0005
 or
  • m e , m r and m ' o are expressed in meters,
  • log is the natural logarithm,
  • L is the strip length between the two printing lines expressed in meters,
  • v is the speed of the strip expressed in m · s- 1 ,
  • V is the maximum speed of the means for varying the length of the strip travel, expressed in mm. s -1 ,
  • P max is the maximum authorized value of the derivative of / dm expressed in mm · m- 1 .

L'invention sera mieux comprise à l'aide de la description suivante des mises en oeuvre préférées des procédés de l'invention, en référence aux dessins annexés, sur lesquels :

  • la figure 1a représente la loi de déplacement du rouleau registre, selon le premier procédé de l'invention, en fonction du défilement de la bande ;
  • la figure 1 b représente l'écart de repérage selon le procédé illustré sur la figure 1a ;
  • la figure 2a représente la loi de déplacement du rouleau registre, selon le deuxième procédé de l'invention, en fonction du défilement de la bande, et
  • la figure 2b représente l'écart de repérage selon le procédé illustré sur la figure 2a.
The invention will be better understood using the following description of the preferred implementations of the methods of the invention, with reference to the accompanying drawings, in which:
  • FIG. 1a represents the law of displacement of the register roller, according to the first method of the invention, as a function of the movement of the strip;
  • Figure 1b shows the tracking difference according to the method illustrated in Figure 1a;
  • FIG. 2a represents the law of displacement of the register roller, according to the second method of the invention, as a function of the movement of the strip, and
  • FIG. 2b represents the tracking difference according to the method illustrated in FIG. 2a.

On ne décrira pas ici les postes d'impression de la rotative sur laquelle les écarts de repérage d'une bande à imprimer en mouvement au moins légèrement élastique sont éliminés par le procédé qui va par contre être décrit.We will not describe here the printing stations of the press on which the location differences of a band to be printed in movement at least slightly elastic are eliminated by the process which will however be described.

On ne décrira pas non plus les moyens de variation de la longueur du parcours de bande pour un point déterminé de cette bande, c'est-à-dire le ou les rouleaux registres, avec leur servomoteur d'entraînement, ni les différentiels des cylindres imprimeurs qu'on pourrait vouloir utiliser en l'absence de rouleaux registres pour faire varier la longueur du parcours de bande entre un premier poste d'impression et un deuxième poste d'impression situé immédiatement en amont du premier.We will not describe either the means of varying the length of the strip path for a determined point on this strip, that is to say the register roller (s), with their drive servomotor, or the differentials of the cylinders. printers that one might want to use in the absence of register rolls to vary the length of the strip path between a first printing station and a second printing station located immediately upstream of the first.

On se référera dans la description qui va suivre à une modification de la longueur du parcours de bande par un rouleau registre, mais le procédé trouve tout aussi bien son application en cas de variations du calage angulaire des cylindres imprimeurs.Reference will be made in the description which follows to a modification of the length of the strip path by a register roller, but the method finds its application just as well in the event of variations in the angular setting of the printing cylinders.

On évoquera plus particulièrement l'écart de repérage sur une bande défilant sur une rotative d'imprimerie, mais le procédé s'applique à tout dispositif d'impression de n'importe quelle bande au moins légèrement élastique.We will mention more particularly the tracking difference on a strip running on a printing press, but the method applies to any printing device of any strip at least slightly elastic.

Enfin, la bande en question peut être débitée depuis une bobine, mais il ne s'agit pas en l'occurrence d'une limitation du procédé.Finally, the tape in question can be cut from a reel, but this is not a process limitation in this case.

Un écart de repérage ayant donc été constaté entre deux postes d'impression adjacents et mesuré, d'une longueur εo (figure 1b), est mis en marche, à vitesse maximale V, le servo-moteur du rouleau registre pour l'entraîner dans un sens au-delà de la position ro dans laquelle il modifie la longueur du parcours de bande de εo (figure 1a), dans l'espèce représentée en l'augmentant. Ainsi le rouleau registre est entraîné jusqu'à une position intermédiaire ri jusqu'à ce que la bande ait défilé, depuis le début de la correction, d'une longueur mi qui sera définie plus loin.A tracking difference having therefore been observed between two adjacent printing stations and measured, of a length ε o (FIG. 1b), is started, at maximum speed V, the servo-motor of the roller. register to drive it in a direction beyond the position r o in which it modifies the length of the strip path of ε o (Figure 1a), in the species represented by increasing it. Thus the register roller is driven to an intermediate position r i until the strip has passed, from the start of the correction, by a length m i which will be defined later.

Pendant ce défilement de bande de longueur mi, l'écart de repérage a varié de εo à εi (figure 1b).During this strip scrolling of length m i , the tracking difference varied from ε o to ε i (FIG. 1b).

On notera que la loi de variation de l'écart de repérage ε, de εo à εi, est telle que la pente de la dérivée augmente, avec, en εi, une pente de dérivée relativement forte. La raison de ce caractère de la loi au cours du déplacement du registre tient au fait qu'il n'atteint pas la position ri, ni même la position ro, de façon instantanée. La raison de la forte pente de la loi à la fin du déplacement du registre tient au fait qu'il se déplace à pleine vitesse. On remarquera d'ailleurs que plus cet écart initial est important, plus la pente est forte.It will be noted that the law of variation of the tracking difference ε, from ε o to ε i , is such that the slope of the derivative increases, with, in ε i , a relatively strong derivative slope. The reason for this character of the law during the movement of the register is due to the fact that it does not reach the position r i , or even the position r o , instantaneously. The reason for the steep slope of the law at the end of the movement of the register is that it moves at full speed. It will also be noted that the larger this initial difference, the steeper the slope.

Aussitôt que le registre a atteint la position ri, et sans marquer le moindre temps d'arrêt, on inverse son entraînement toujours à la vitesse maximale V, ce qui en l'espèce fait rediminuer la longueur du parcours de bande pour la replacer dans la position ro définie plus haut (figure 1a), à l'instant où la bande a défilé, depuis le début de la correction, d'une longueur mo, (figure 1a). qui sera définie plus loin, et où l'écart de repérage e s'est annulé (figure 1 b).As soon as the register has reached the position r i , and without marking the slightest downtime, its drive is always reversed at the maximum speed V, which in this case causes the length of the strip path to be reduced in order to replace it in the position r o defined above (FIG. 1a), at the instant when the strip has passed, since the start of the correction, of a length m o , (FIG. 1a). which will be defined below, and where the tracking difference e has been canceled (FIG. 1 b).

On a donc fait faire au rouleau registre un pseudo-aller et retour.So we rolled the register roller a pseudo-round trip.

On notera que la courbe représentative de la variation de l'écart de repérage ε (figure 1b) présente pour m = mi un point d'inflexion, ce que l'homme de métier appréciera sans difficultés puisqu'on rapproche le registre de sa position de départ, et qu'entre les points m = mi et m = mo elle évolue toujours selon une loi exponentielle.It will be noted that the curve representative of the variation in the tracking difference ε (FIG. 1b) has an inflection point for m = m i , which the skilled person will appreciate without difficulty since the register is brought closer to his starting position, and that between the points m = m i and m = m o it always evolves according to an exponential law.

Pour m = mo, le registre est dans la position où il a modifié la longueur du parcours de bande d'une longueur égale à so et l'écart de repérage est nul, si bien qu'à partir de cet instant, ou pour les longueurs de bande suivantes, le repérage est maintenu.For m = m o , the register is in the position where it modified the length of the tape path by a length equal to s o and the tracking difference is zero, so that from this moment, or for the following strip lengths, the marking is maintained.

Abordons maintenant les longueurs mi et mo de bande perdues.Let us now approach the lengths m i and m o of lost tape.

Les valeurs de mi et mo sont données par le système suivant de deux équations à deux inconnues :

Figure imgb0006
e est la base des logarithmes népériens, dont la valeur est égale à 2,718.The values of m i and m o are given by the following system of two equations with two unknowns:
Figure imgb0006
 e is the base of natural logarithms, whose value is equal to 2.718.

L est la longueur de bande comprise entre les deux lignes d'impression des deux postes concernés, exprimée en mètres (m). Elle est constante, à la variation de longueur près, qui est du second ordre et donc négligeable.L is the strip length between the two printing lines of the two stations concerned, expressed in meters (m). It is constant, except for the variation in length, which is second order and therefore negligible.

εo est l'écart de repérage initial mesuré, exprimé en millimètres (mm).ε o is the initial tracking error measured, expressed in millimeters (mm).

v est la vitesse donnée de la bande exprimée en mètres par seconde (m - s-1).v is the given speed of the strip expressed in meters per second (m - s -1 ).

V est la vitesse linéaire donnée de l'action du registre exprimée en millimètres par seconde (mm - s-').V is the given linear speed of the action of the register expressed in millimeters per second (mm - s- ').

Tous ces paramètres sont donc connus soit par mesure, soit par construction. A partir de ces paramètres, on peut donc résoudre le système d'équation ci-dessus, par exemple à l'aide d'un calculateur ou d'un microprocesseur, pour corriger automatiquement l'écart de repérage.All these parameters are therefore known either by measurement or by construction. From these parameters, we can therefore solve the above equation system, for example using a computer or a microprocessor, to automatically correct the tracking difference.

La demanderesse a en outre trouvé que, de manière approchée, mo était donnée par la formule

Figure imgb0007
où a, b et c sont des constantes et K le rapport εo v/NThe Applicant has further found that, approximately, m o is given by the formula
Figure imgb0007
 where a, b and c are constants and K the ratio ε o v / N

Avantageusement, b est la longueur L définie ci-dessus et a et c des constantes par exemples égales à 2 et 0,2 respectivement.Advantageously, b is the length L defined above and a and c are constants for example equal to 2 and 0.2 respectively.

Quant à mi elle est donnée par la formuleAs for m i it is given by the formula

Figure imgb0008
Figure imgb0008

On a illustré le procédé décrit ci-dessus avec des écarts de repérage dans un sens. Le procédé s'applique bien entendu tout aussi bien à la correction d'écarts de repérage dans l'autre sens. En d'autres termes, l'entraînement du registre dans la position ri peut entraîner aussi bien une augmentation de la longueur du parcours de bande, comme dans l'exemple représenté, qu'une diminution de cette longueur.The method described above has been illustrated with tracking differences in one direction. The method applies of course just as well to the correction of tracking differences in the other direction. In other words, driving the register in the position r i can lead to an increase in the length of the strip path, as in the example shown, as well as a reduction in this length.

Le procédé s'applique évidemment à tous les postes de la rotative.The process obviously applies to all positions on the press.

Dans la pratique, l'application du procédé, tel qu'il vient d'être décrit, pourrait provoquer, pendant le parcours aller du registre, soit le flottement de la bande, soit sa rupture ou son glissement, avec les inconvénients déjà évoqués ci-dessus.In practice, the application of the process, as just described, could cause, during the forward course of the register, either the floating of the strip, or its rupture or its sliding, with the drawbacks already mentioned above.

Pour cette raison, et conformément à la deuxième mise en oeuvre du procédé de l'invention, on n'entraîne le registre à vitesse maximale que jusqu'à une position re (figure 2a), la bande ayant alors défilé d'une longueur me et l'écart de repérage e étant passé de εo à εe (figure 2b).For this reason, and in accordance with the second implementation of the method of the invention, the register is driven at maximum speed only to a position r e (FIG. 2a), the strip having then passed by a length m e and the locating difference e having passed from ε o to ε e (FIG. 2b).

On notera que la loi de variation de ε, de εo à εe, comme ci-dessus, est telle que la pente de la dérivée augmente.It will be noted that the law of variation of ε, from ε o to ε e , as above, is such that the slope of the derivative increases.

Si on désigne par P la pente ds/dm de la courbe représentative de la variation de l'écart de repérage e en fonction de la longueur de bande défilée m, et par Pmax la pente maximale admissible pour que la tension de la bande reste positive mais inférieure à la valeur de rupture ou de glissement de la bande, Pmax pouvant d'ailleurs avoir deux valeurs différentes selon que la variation de l'écart est provoquée par le raccourcissement ou par l'allongement du parcours de bande, la première portion de bande aura de préférence une longueur me, donnée par l'équation

Figure imgb0009
où

  • me est exprimée en mètres,
  • log est le logarithme népérien, et

les autres grandeurs celles précédemment définies.If we designate by P the slope ds / dm of the curve representative of the variation of the tracking deviation e as a function of the length of the traveling strip m, and by P max the maximum admissible slope so that the tension of the strip remains positive but less than the value of break or slip of the strip, P max can also have two different values depending on whether the variation of the gap is caused by the shortening or by the lengthening of the strip path, the first portion of strip will preferably have a length m e , given by the equation
Figure imgb0009
 or
  • m e is expressed in meters,
  • log is the natural logarithm, and

the other quantities those previously defined.

En admettant que la longueur me est inférieure à la longueur mi, dès que le registre a atteint la position re, et sans marquer le moindre temps d'arrêt, on réduit la vitesse du registre à la valeur VPmax' jusqu'à une position r,, jusqu'à ce que la bande ait défilé d'une longueur mr et ε évoluant de εe à εr (figure 2b).Assuming that the length m e is less than the length m i , as soon as the register has reached the position r e , and without marking the slightest downtime, the speed of the register is reduced to the value VP max ' up to at a position r ,, until the strip has passed a length m r and ε evolving from ε e to ε r (FIG. 2b).

Dès que le registre a atteint la position rr' et sans marquer le moindre temps d'arrêt, on inverse son entraînement et on le fait repartir à nouveau à la vitesse maximale V, ce qui fait rediminuer la longueur du parcours de bande, pour le replacer dans la position ro définie précédemment (figure 1a et 2a), la bande ayant alors défilé d'une longueur mo' et l'écart de repérage s'étant annulé (figure 2b).As soon as the register has reached the position r r ' and without marking the slightest downtime, its training is reversed and it is started again at the maximum speed V, which reduces the length of the strip path, to replace it in the position r o defined previously (FIGS. 1a and 2a), the strip having then passed by a length m o ′ and the tracking difference having been canceled (FIG. 2b).

On a donc encore fait faire au rouleau-registre un pseudo-aller et retour.We therefore made the register roll a pseudo-round trip.

On notera que la courbe représentative de l'écart ε (figure 2b) est identique, jusqu'au mètre me, à celle de la figure 1b.It will be noted that the curve representative of the difference ε (FIG. 2b) is identical, up to the meter m e , to that of FIG. 1b.

Au-delà, de me à mr, elle présente une portion de droite, sur laquelle la variation de ε est égale à la variation de la longueur du parcours de bande, ce que l'homme de métier appréciera sans difficulté puisqu'on continue d'éloigner le rouleau-registre de sa position de départ précisément à la vitesse pour laquelle P conserve sa valeur maximale autorisée, atteinte au mètre me.Beyond, from m e to m r , it has a straight portion, on which the variation of ε is equal to the variation of the length of the strip path, which the skilled person will appreciate without difficulty since we continues away roll-register its starting position precisely at the speed for which P retains its maximum value of interference with the meter m e.

Au-delà de mr, entre m, et m'o, la courbe ε évolue de nouveau selon une loi exponentielle. Au mètre m'o, le registre est dans la position où il a modifié la longueur du parcours de la bande d'une longueur égale à eo et l'écart de repérage est nul, si bien qu'à partir de cet instant, et pour les longueurs de bande suivantes, le repérage est maintenu, tout comme précédemment.Beyond m r , between m, and m ' o , the curve ε again changes according to an exponential law. By the meter m ' o , the register is in the position where it modified the length of the course of the strip by a length equal to e o and the tracking difference is zero, so that from this moment, and for the following strip lengths, the tracking is maintained, as before.

Les valeurs de mr et m'o, en mètres, sont données par les équations :

Figure imgb0010
The values of m r and m ' o , in meters, are given by the equations:
Figure imgb0010

Les deux valeurs de Pmax évoquées plus haut peuvent être manuellement introduites dans le calculateur ou le microprocesseur. Elles dépendent de la nature du matériau à imprimer, et notamment de son coefficient d'élasticité, des dimensions des cylindres d'impression utilisés, de la tension sous laquelle la bande est introduite dans le premier poste d'impression, etc.The two values of P max mentioned above can be manually entered into the computer or the microprocessor. They depend on the nature of the material to be printed, and in particular on its coefficient of elasticity, the dimensions of the printing cylinders used, the tension under which the strip is introduced into the first printing station, etc.

Ces deux valeurs pourraient encore être établies par corrections successives de proche en proche, par comparaison entre l'évolution de ε, telle qu'elle résulte des mesures pratiquées à chaque tour des cylindres imprimeurs, et l'évolution de ε calculée par les équations :

Figure imgb0011
avec l'hypothèse que P n'a pas dépassé Pmax.These two values could also be established by successive corrections step by step, by comparison between the evolution of ε, as it results from the measurements carried out at each turn of the printing cylinders, and the evolution of ε calculated by the equations:
Figure imgb0011
 with the assumption that P did not exceed P max .

Claims (6)

1. Process for correcting registration deviation in devices for printing on a moving web to be printed, which is at least slightly elastic, particularly rotary printing presses, comprising a certain number of printing stations each defining a line of print, in which, for a registration deviation (εo) measured at a first printing station, the length of the path of the web is modified by modifying means, for a determined point of the web, between the line of print of the first station and the line of print of assecond printing station disposed immediately upstream of the latter, by a length greater than this deviation (εo), in which, after having modified the length of the path of web in a first direction, it is modified again and without dwell time in a second, opposite direction, characterized in that the modification of the length of the path of web in the first direction is effected at maximum speed of the means modifying the length of the path of the web during advance of a first portion of the web of length mi, and the modification of the length of the path of web in the second opposite direction is effected at maximum speed of the modifying means during advance of a second portion of the web of length (mo - mi), until the final modification of the length of the path is equal to the measured registration deviation (εo) and from a position of the modiflying means in the second direction such that the final modification (εo) of the path be effected with cancellation of the registration deviation, mo and mi being given by the system of equations :
Figure imgb0022
Figure imgb0023
where e is tne base of the natural logarithms and k and K are constants.
2. The process of claim 1, wherein
Figure imgb0024
are expressed in metres,
Figure imgb0025
L being the length of web between the two lines of print expressed in metres,
Figure imgb0026
so being the initial registration deviation measured, expressed in mm, v being the speed of the web expressed in m · s-1, V being the speed of means for modifying the length of the path of web.
3. The process of claim 2, wherein mo and mi are given by the approximate formulae :
Figure imgb0027
Figure imgb0028
where a, b, c are constants.
4. Process for correcting registration deviation in devices for printing on a moving web to be printed, which is at least slightly elastic, particularly rotary printing presses, comprising a certain number of printing stations each defining a line of print, in which, for registration deviation (eo) measured at a first printing station, the length of the path of the web is modified by modifying means, for a determined point of the web, between the line of print of the first station and the line of print of a second printing station disposed immediately upstream of the latter, by a length greater than this deviation (so), in which, after having modified the length of the path of web in a first direction, it is modified again and without dwell time in a second, opposite direction, characterized in that the modification of the length of the path of web in the first direction is effected first at maximum speed of the means modifying the length of the path of the web during advance of a first portion of the web of length me and then, without dwell time, at reduced speed during advance of a second portion of web of length (mr- me), and the modification of the length of the path of web in the second opposite direction is effected at maximum speed of the modifying means during advance of a third portion of the web of length (m'o-mi), until the final modification of the length of the path is equal to the measured registration deviation (eo), and from a position of the modifying means in the second direction such that the final modification (so) of the path be effected with cancellation of the registration deviation, me, m, and m'o being given by equations :
Figure imgb0029
Figure imgb0030
Figure imgb0031
where
me, mr and m'o are expressed in metres,
log is the natural logarithm,
L is the length of web between the two lines of print expressed in metres,
v is the speed of the web expressed in m - s-1,
V is the maximum speed of the means for modifying the length of the path of web, expressed in mm - s-1,
Pmax is the maximum value allowed for the derivative dε/dm expressed in mm - m-1.
5. The process of one of claims 1 to 4, wherein the length of the path of web is directly modified with the aid of a least one register roller.
6. The process of one of claims 1 to 4 wherein the length of the path of web is modified by modifying the angular setting of an impression cylinder.
EP19840400459 1983-03-10 1984-03-07 Method of correcting register deviations in printing devices Expired EP0119138B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400459T ATE30698T1 (en) 1983-03-10 1984-03-07 PROCEDURE FOR CORRECTING REGISTER DEVIATIONS IN PRINTING EQUIPMENT.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8303935 1983-03-10
FR8303935A FR2542255B1 (en) 1983-03-10 1983-03-10 METHOD FOR CORRECTING LOCATION DIFFERENCES ON PRINTING DEVICES
FR8315988A FR2553033B2 (en) 1983-10-07 1983-10-07 METHOD FOR CORRECTING LOCATION DIFFERENCES ON PRINTING DEVICES
FR8315988 1983-10-07

Publications (2)

Publication Number Publication Date
EP0119138A1 EP0119138A1 (en) 1984-09-19
EP0119138B1 true EP0119138B1 (en) 1987-11-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1117477A (en) 1954-01-14 1956-05-23 Crosfield J F Ltd Improvements in marking procedures on paper strips or fabrics
DE1085234B (en) * 1954-08-23 1960-07-14 Licentia Gmbh Electrical controller for processing machines of printed running webs
US2866407A (en) * 1955-03-04 1958-12-30 Licentia Gmbh Electric control system
DE1151858B (en) * 1955-07-06 1963-07-25 Licentia Gmbh Electrical controller for first-order controlled systems
US3525858A (en) * 1967-05-09 1970-08-25 Hurletron Inc Web register control apparatus responsive to web speed and register error
BE789456A (en) 1971-10-08 1973-01-15 Bobst Fils Sa J METHOD AND DEVICE FOR CORRECTING THE MARKING OF IMAGES IN A MACHINE WITH MULTIPLE STATIONS

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CA1250788A (en) 1989-03-07
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