EP0633134B1 - Intaglio printing machine - Google Patents

Intaglio printing machine Download PDF

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Publication number
EP0633134B1
EP0633134B1 EP94810338A EP94810338A EP0633134B1 EP 0633134 B1 EP0633134 B1 EP 0633134B1 EP 94810338 A EP94810338 A EP 94810338A EP 94810338 A EP94810338 A EP 94810338A EP 0633134 B1 EP0633134 B1 EP 0633134B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
wiping
speed
plate cylinder
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94810338A
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German (de)
French (fr)
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EP0633134A1 (en
Inventor
Antonio Bonomi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KBA Notasys SA
Original Assignee
De la Rue Giori SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by De la Rue Giori SA filed Critical De la Rue Giori SA
Publication of EP0633134A1 publication Critical patent/EP0633134A1/en
Application granted granted Critical
Publication of EP0633134B1 publication Critical patent/EP0633134B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/08Wiping mechanisms
    • B41F9/10Doctors, scrapers, or like devices
    • B41F9/1018Doctors, scrapers, or like devices using a wiping cylinder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/004Electric or hydraulic features of drives
    • B41F13/0045Electric driving devices

Definitions

  • the invention relates to an intaglio printing machine comprising a plate cylinder and a wiping cylinder which is in contact with the plate cylinder and whose speed of rotation peripheral to the contact zone is opposite to that of the plate cylinder, the latter being driven in rotation by a first motor (see US-A-2,659,305).
  • Such intaglio printing machines have been known for a long time.
  • the wiping cylinder is used to clean the surface of the intaglio printing plates carried by the plate cylinder at each revolution thereof after the inking of said plates, so that the ink only fills the engraved sizes while the surface of the plates outside the sizes is completely devoid of ink, this in order to obtain an integrity impression.
  • a relative peripheral speed between the two cylinders is created in the contact zone which is the effective wiping speed composed of the addition of the peripheral speed of the plate cylinder and the peripheral speed of the cylinder. wiping.
  • the quality of the wiping depends, apart from the nature of the surface or the coating of the wiping cylinder, this wiping speed and the pressure between the two cylinders. It turned out that the higher the effective wiping speed, greater must be the pressure with which the cylinders are in contact so that the wiping is perfect.
  • the design of all printing machines known so far is such that it is the plate cylinder which is driven by a motor and that the drive of the wiping cylinder is done by the same motor via a kinematic connection with the plate cylinder formed by a gear system. So the two cylinders are driven by a single motor, with a fixed speed ratio.
  • an optimal printing speed is chosen, that is to say that the speed of rotation of the plate cylinder.
  • this predetermined speed which also defines the speed of rotation of the wiping cylinder.
  • the optimum wiping pressure depending on the effective wiping speed is chosen.
  • the object of the invention is to avoid the need for a readjustment of the pressure of the wiping cylinder. against the plate cylinder each time the speed of the plate cylinder is changed.
  • the invention is characterized by the characteristic clause of claim 1.
  • the relative peripheral speed therefore the wiping speed, remains constant for any speed of rotation of the plate cylinder and it is not necessary to modify the pressure between the plate cylinder and the wiping cylinder once this pressure has been chosen.
  • Figure 1 schematically illustrates the essential parts of an intaglio printing machine.
  • Figure 2 is the control block diagram of the plate and wiping cylinders.
  • FIG. 1 there is shown a conventional intaglio machine comprising a plate cylinder 1 on the periphery of which are mounted the intaglio printing plates.
  • This plate cylinder 1 is in contact with the printing cylinder 2 and, in the example shown, with three ink rollers 3 supplied by inking devices 4 shown diagrammatically in FIG. 1.
  • the three rollers 3 are intended ink the intaglio printing plates with three different inks.
  • the wiping cylinder 5 is also associated with a cleaning device 6, illustrated diagrammatically in FIG. 1, which makes it possible to remove every trace of ink from the surface of said wiping cylinder 5 before it it does not come into contact with the intaglio plate which it must clean.
  • the paper 8 to be printed which can be either sheets or a strip of paper, is brought via two input rollers 9 onto the periphery of the printing cylinder 2, then passes between the printing cylinder 2 and the plate cylinder 1 to be printed and exits via the output roller 10.
  • the plate cylinder 1 and the printing cylinder 2 rotate in opposite directions according to the arrows, such that their surface peripheral to the contact zone, which is practically a line of contact, rotates in the same direction, the contact between the two cylinders 1 and 2 is therefore made without friction to allow the correct transfer of the ink from the intaglio printing plates onto the paper to be printed which passes between the two cylinders.
  • the wiping cylinder 5 rotates in the same direction of rotation as the plate cylinder 1 and therefore at the level of the contact zone between the cylinders, their peripheral speeds are opposite, as indicated by the arrows, thus creating a friction which ensures wiping.
  • the drive of the plate cylinder drive 1 and the wiping cylinder 5 is shown diagrammatically in FIG. 2.
  • a first engine M1 drives the plate cylinder 1 while a second engine M5 drives the wiping cylinder 5.
  • the shafts of the two cylinders are each equipped with a speed measurement sensor, for example a tachometric dynamo T1, respectively T5.
  • the data measured by these tachometric dynamo T1, T5 are transmitted to an electronic control unit 7 which is arranged to control on the one hand the motor M1, on the other hand the motor M5 in such a way that the relative peripheral speed between the two cylinders 1 and 5 remains constant and is maintained at a given value chosen as the optimal value.
  • This speed is independent of the printing speed, i.e.
  • the relative peripheral speed that is to say the effective wiping speed
  • the relative peripheral speed remains constant and it is as a function of this wiping speed that the optimal wiping pressure is chosen.
  • the wiping speed is 3 m / s.
  • This optimal speed will be stored in the control unit. If, due to very different printing conditions, it turns out that, depending on these conditions, one or more other optimal values of the wiping speed are advantageous, it is of course possible to predetermine several speed values d wiping depending on the circumstances and memorizing them. In general, this optimal wiping speed is between 2.5 and 3.5 m / s.

Abstract

In an intaglio printing machine including a plate cylinder (1), a printing cylinder and a wiping cylinder (5), the plate cylinder (1) and wiping cylinder (5) are each driven by their own motor (M1, M5). The two motors are connected together by a control unit (7) designed to control the speeds of the two cylinders (1, 5) so that their relative peripheral speed is maintained at a constant value if the speed of the motor (M1) driving the plate cylinder is altered. <IMAGE>

Description

L'invention concerne une machine d'impression taille-douce comprenant un cylindre porte-plaques et un cylindre d'essuyage qui se trouve en contact avec le cylindre porte-plaques et dont la vitesse de rotation périphérique à la zone de contact est opposée à celle du cylindre porte-plaques, ce dernier étant entraîné en rotation par un premier moteur (voir US-A-2 659 305).The invention relates to an intaglio printing machine comprising a plate cylinder and a wiping cylinder which is in contact with the plate cylinder and whose speed of rotation peripheral to the contact zone is opposite to that of the plate cylinder, the latter being driven in rotation by a first motor (see US-A-2,659,305).

De telles machines d'impression taille-douce sont connues depuis longtemps. Dans ce type de machines, le cylindre d'essuyage sert à nettoyer la surface des plaques d'impression taille-douce portées par le cylindre porte-plaques à chaque révolution de celui-ci après l'encrage desdites plaques, de manière que l'encre ne remplisse que les tailles gravées alors que la surface des plaques en dehors des tailles est complètement dépourvue d'encre, ceci afin d'obtenir une impression impeccable. Pour arriver à ce résultat, il est nécessaire d'avoir une friction entre les plaques et le cylindre d'essuyage, friction qui est produite en faisant tourner le cylindre porte-plaques et le cylindre d'essuyage avec des vitesses périphériques opposées dans leur zone de contact et donc dans le même sens de rotation. De cette façon, on crée dans la zone de contact une vitesse périphérique relative entre les deux cylindres qui est la vitesse effective d'essuyage composée de l'addition de la vitesse périphérique du cylindre porte-plaques et de la vitesse périphérique du cylindre d'essuyage. La qualité de l'essuyage dépend, mis à part la nature de la surface ou du revêtement du cylindre d'essuyage, de cette vitesse d'essuyage et de la pression entre les deux cylindres. Il s'est avéré que plus la vitesse effective d'essuyage est grande, plus grande devait être la pression avec laquelle les cylindres sont en contact pour que l'essuyage soit parfait. En général, la conception de toutes les machines d'impression connues jusqu'ici est telle que c'est le cylindre porte-plaques qui est entraîné par un moteur et que l'entraînement du cylindre d'essuyage se fait par le même moteur via une liaison cinématique avec le cylindre porte-plaques formée par un système d'engrenages. Donc les deux cylindres sont entraînés par un seul moteur, avec un rapport de vitesse fixe.Such intaglio printing machines have been known for a long time. In this type of machine, the wiping cylinder is used to clean the surface of the intaglio printing plates carried by the plate cylinder at each revolution thereof after the inking of said plates, so that the ink only fills the engraved sizes while the surface of the plates outside the sizes is completely devoid of ink, this in order to obtain an impeccable impression. To achieve this, it is necessary to have friction between the plates and the wiping cylinder, friction which is produced by rotating the plate cylinder and the wiping cylinder with opposite peripheral speeds in their area. contact and therefore in the same direction of rotation. In this way, a relative peripheral speed between the two cylinders is created in the contact zone which is the effective wiping speed composed of the addition of the peripheral speed of the plate cylinder and the peripheral speed of the cylinder. wiping. The quality of the wiping depends, apart from the nature of the surface or the coating of the wiping cylinder, this wiping speed and the pressure between the two cylinders. It turned out that the higher the effective wiping speed, greater must be the pressure with which the cylinders are in contact so that the wiping is perfect. In general, the design of all printing machines known so far is such that it is the plate cylinder which is driven by a motor and that the drive of the wiping cylinder is done by the same motor via a kinematic connection with the plate cylinder formed by a gear system. So the two cylinders are driven by a single motor, with a fixed speed ratio.

Ainsi, pour une machine d'impression donnée, avec un type de plaque d'impression donné et une qualité de papier et d'encre donnée, on choisit une vitesse d'impression optimale, c'est à dire que l'on choisit la vitesse de rotation du cylindre porte-plaques. Sous ces conditions, avec cette vitesse prédéterminée qui définit aussi la vitesse de rotation du cylindre d'essuyage, on choisit la pression d'essuyage optimale dépendant de la vitesse effective d'essuyage. Si maintenant, avec la même machine d'impression taille-douce, on veut utiliser un autre type de plaque taille-douce et/ou une autre qualité de papier, et/ou un autre type d'encre, il convient de changer la vitese d'impression, à savoir la vitesse du cylindre porte-plaques. Cela a pour conséquence que si, par exemple, la vitesse du cylindre porte-plaques est augmentée, la vitesse du cylindre d'essuyage augmente également et vice-versa. Cela signifie que, dans tous les cas, pour obtenir un essuyage optimal il faut réajuster la pression d'essuyage, ce qui représente une complication et une perte de temps.Thus, for a given printing machine, with a given type of printing plate and a given quality of paper and ink, an optimal printing speed is chosen, that is to say that the speed of rotation of the plate cylinder. Under these conditions, with this predetermined speed which also defines the speed of rotation of the wiping cylinder, the optimum wiping pressure depending on the effective wiping speed is chosen. If now, with the same intaglio printing machine, we want to use another type of intaglio plate and / or another quality of paper, and / or another type of ink, it is necessary to change the speed the speed of the plate cylinder. This has the consequence that if, for example, the speed of the plate cylinder is increased, the speed of the wiping cylinder also increases and vice versa. This means that, in all cases, to obtain optimal wiping, it is necessary to readjust the wiping pressure, which represents a complication and a waste of time.

Le but de l'invention consiste à éviter la nécessité d'un réajustement de la pression du cylindre d'essuyage contre le cylindre porte-plaques chaque fois que la vitesse du cylindre porte-plaques est modifiée.The object of the invention is to avoid the need for a readjustment of the pressure of the wiping cylinder. against the plate cylinder each time the speed of the plate cylinder is changed.

A cet effet, l'invention est caractérisée par la clause caractéristique de la revendication 1.To this end, the invention is characterized by the characteristic clause of claim 1.

Par ces mesures, la vitesse périphérique relative, donc la vitesse d'essuyage, se maintient constante pour n'importe quelle vitesse de rotation du cylindre porte-plaques et il n'est pas nécessaire de modifier la pression entre le cylindre porte-plaques et le cylindre d'essuyage une fois que cette pression a été choisie.By these measurements, the relative peripheral speed, therefore the wiping speed, remains constant for any speed of rotation of the plate cylinder and it is not necessary to modify the pressure between the plate cylinder and the wiping cylinder once this pressure has been chosen.

L'invention sera décrite à l'aide du dessin annexé qui représente une forme d'exécution de l'invention.The invention will be described using the appended drawing which represents an embodiment of the invention.

La figure 1 illustre schématiquement les parties essentielles d'une machine d'impression taille-douce.Figure 1 schematically illustrates the essential parts of an intaglio printing machine.

La figure 2 est le schéma-bloc de commande des cylindres porte-plaques et d'essuyage.Figure 2 is the control block diagram of the plate and wiping cylinders.

En se référant à la figure 1 on montre une machine taille-douce conventionnelle comprenant un cylindre porte-plaques 1 sur la périphérie duquel sont montées les plaques d'impression taille-douce. Ce cylindre porte-plaques 1 est en contact avec le cylindre d'impression 2 et, dans l'exemple représenté, avec trois rouleaux encreurs 3 alimentés par des dispositifs d'encrage 4 montrés schématiquement sur la figure 1. Les trois rouleaux 3 sont destinés à encrer les plaques d'impression taille-douce avec trois encres différentes. Après les rouleaux encreurs 3 et, vu dans le sens de rotation, avant le cylindre d'impression 2, il est prévu un cylindre d'essuyage 5 pour essuyer la surface des plaques en dehors des tailles avant l'impression. Le cylindre d'essuyage 5 est en outre associé à un dispositif de nettoyage 6, illustré schématiquement sur la figure 1, qui permet d'enlever à chaque révolution toute trace d'encre de la surface dudit cylindre d'essuyage 5 avant que celui-ci n'entre en contact avec la plaque taille-douce qu'il doit nettoyer.Referring to Figure 1 there is shown a conventional intaglio machine comprising a plate cylinder 1 on the periphery of which are mounted the intaglio printing plates. This plate cylinder 1 is in contact with the printing cylinder 2 and, in the example shown, with three ink rollers 3 supplied by inking devices 4 shown diagrammatically in FIG. 1. The three rollers 3 are intended ink the intaglio printing plates with three different inks. After the ink rollers 3 and, seen in the direction of rotation, before the printing cylinder 2, it is provided with a wiping cylinder 5 for wiping the surface of the plates outside the sizes before printing. The wiping cylinder 5 is also associated with a cleaning device 6, illustrated diagrammatically in FIG. 1, which makes it possible to remove every trace of ink from the surface of said wiping cylinder 5 before it it does not come into contact with the intaglio plate which it must clean.

Le papier 8 à imprimer, qui peut être soit des feuilles soit une bande de papier, est amené par l'intermédiaire de deux rouleaux d'entrée 9 sur la périphérie du cylindre d'impression 2, passe ensuite entre le cylindre d'impression 2 et le cylindre porte-plaques 1 pour être imprimé et sort par l'intermédiaire du rouleau de sortie 10.The paper 8 to be printed, which can be either sheets or a strip of paper, is brought via two input rollers 9 onto the periphery of the printing cylinder 2, then passes between the printing cylinder 2 and the plate cylinder 1 to be printed and exits via the output roller 10.

Le cylindre porte-plaques 1 et le cylindre d'impression 2 tournent en sens inverse selon les flèches, tel que leur surface périphérique à la zone de contact, qui est pratiquement une ligne de contact, tourne dans le même sens, le contact entre les deux cylindres 1 et 2 se fait donc sans frottement pour permettre le transfert correct de l'encre des plaques d'impression taille-douce sur le papier à imprimer qui passe entre les deux cylindres.The plate cylinder 1 and the printing cylinder 2 rotate in opposite directions according to the arrows, such that their surface peripheral to the contact zone, which is practically a line of contact, rotates in the same direction, the contact between the two cylinders 1 and 2 is therefore made without friction to allow the correct transfer of the ink from the intaglio printing plates onto the paper to be printed which passes between the two cylinders.

Le cylindre d'essuyage 5 tourne dans le même sens de rotation que le cylindre porte-plaques 1 et donc au niveau de la zone de contact entre les cylindres, leurs vitesses périphériques sont contraires, comme indiqué par les flèches, créant ainsi un frottement qui assure l'essuyage.The wiping cylinder 5 rotates in the same direction of rotation as the plate cylinder 1 and therefore at the level of the contact zone between the cylinders, their peripheral speeds are opposite, as indicated by the arrows, thus creating a friction which ensures wiping.

La commande de l'entraînement du cylindre porte-plaques 1 et du cylindre d'essuyage 5 est montrée schématiquement figure 2. Un premier moteur M1 entraîne le cylindre porte-plaques 1 tandis qu'un deuxième moteur M5 entraîne le cylindre d'essuyage 5. Les arbres des deux cylindres sont équipés chacun d'un capteur de mesure de vitesse, par exemple une dynamo tachométrique T1, respectivement T5. Les données mesurées par ces dynamo tachométriques T1, T5 sont transmises à une unité de contrôle électronique 7 laquelle est disposée pour commander d'une part le moteur M1, d'autre part le moteur M5 de telle manière que la vitesse périphérique relative entre les deux cylindres 1 et 5 reste constante et est maintenue à une valeur donnée choisie comme valeur optimale. Cette vitesse est indépendante de la vitesse d'impression, c'est-à-dire de la vitesse du cylindre porte-plaques 1, donc si la vitesse du cylindre porte-plaques 1 augmente, la vitesse du cylindre d'essuyage 5 diminue et vice-versa. De cette façon, la vitesse relative périphérique, c'est-à-dire la vitesse effective d'essuyage, reste constante et c'est en fonction de cette vitesse d'essuyage qu'est choisie la pression d'essuyage optimale. Par ces mesures on est dispensé des difficultés liées à l'ajustage de la pression du cylindre d'essuyage si les conditions d'impression de la machine sont modifiées, c'est à dire si l'on change par exemple de type de plaque taille-douce et/ou de type d'encre et/ou de type de papier, etc..The drive of the plate cylinder drive 1 and the wiping cylinder 5 is shown diagrammatically in FIG. 2. A first engine M1 drives the plate cylinder 1 while a second engine M5 drives the wiping cylinder 5. The shafts of the two cylinders are each equipped with a speed measurement sensor, for example a tachometric dynamo T1, respectively T5. The data measured by these tachometric dynamo T1, T5 are transmitted to an electronic control unit 7 which is arranged to control on the one hand the motor M1, on the other hand the motor M5 in such a way that the relative peripheral speed between the two cylinders 1 and 5 remains constant and is maintained at a given value chosen as the optimal value. This speed is independent of the printing speed, i.e. the speed of the plate cylinder 1, so if the speed of the plate cylinder 1 increases, the speed of the wiping cylinder 5 decreases and vice versa. In this way, the relative peripheral speed, that is to say the effective wiping speed, remains constant and it is as a function of this wiping speed that the optimal wiping pressure is chosen. By these measures, it is dispensed with difficulties linked to the adjustment of the pressure of the wiping cylinder if the printing conditions of the machine are modified, that is to say if one changes for example the type of plate size - soft and / or ink type and / or paper type, etc.

A titre d'exemple, pour une machine d'impression ayant un cylindre porte-plaques d'un diamètre de 400 mm et un cylindre d'essuyage d'un diamètre de 265 mm, la vitesse périphérique du cylindre porte-plaques étant de 1 m/s et celle du cylindre d'essuyage de 2 m/s, la vitesse d'essuyage est de 3 m/s. Cette vitesse optimale sera mémorisée dans l'unité de commande. Si, à cause de conditions d'impression très différentes, il s'avère que, dépendant de ces conditions, une ou plusieurs autres valeurs optimales de la vitesse d'essuyage sont avantageuses, il est bien entendu possible de prédéterminer plusieurs valeurs de vitesse d'essuyage dépendant des circonstances et de mémoriser celles-ci. En général, cette vitesse d'essuyage optimale est comprise entre 2,5 et 3,5 m/s.For example, for a printing machine having a plate cylinder with a diameter of 400 mm and a wiping cylinder with a diameter of 265 mm, the peripheral speed of the plate cylinder being 1 m / s and that of the wiping cylinder 2 m / s, the wiping speed is 3 m / s. This optimal speed will be stored in the control unit. If, due to very different printing conditions, it turns out that, depending on these conditions, one or more other optimal values of the wiping speed are advantageous, it is of course possible to predetermine several speed values d wiping depending on the circumstances and memorizing them. In general, this optimal wiping speed is between 2.5 and 3.5 m / s.

Claims (2)

  1. Intaglio printing machine comprising a plate cylinder (1) and a wiping cylinder (5) which is in contact with the plate cylinder (1), and of which the peripheral rotational speed at the zone of contact is opposite that of the plate cylinder (1), the latter being driven in rotation by a first motor (M1), characterized in that the wiping cylinder (5) is driven by a second motor (M5), the two motors being connected by a control unit (7) designed to control the speeds of the two motors (M1, M5) such that their relative peripheral speed at the zone of contact is kept at a constant value independently of the speed of the first motor (M1).
  2. Printing machine according to Claim 1, characterized in that the relative peripheral speed lies between 2.5 and 3.5 m/s.
EP94810338A 1993-07-05 1994-06-08 Intaglio printing machine Expired - Lifetime EP0633134B1 (en)

Applications Claiming Priority (2)

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CH2019/93 1993-07-05
CH201993 1993-07-05

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EP0633134A1 EP0633134A1 (en) 1995-01-11
EP0633134B1 true EP0633134B1 (en) 1997-01-22

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2657021A1 (en) 2012-04-24 2013-10-30 KBA-NotaSys SA Adjustable drive unit of a printing press and printing press, especially intaglio printing press, comprising the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659305A (en) * 1950-01-23 1953-11-17 Giori Gualtiero Multicolor rotary, intaglio, letterpress, and offset printing press
US4271379A (en) * 1978-12-29 1981-06-02 Harris Corporation Web fed printing press motor control
CA2073118C (en) * 1991-07-30 2004-09-14 Ernst Anton Blass Intaglio printing machine

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DE69401542T2 (en) 1997-07-31
ATE148031T1 (en) 1997-02-15
DE69401542D1 (en) 1997-03-06

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