EP1070994B1 - Dispositif d'impression - Google Patents

Dispositif d'impression Download PDF

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Publication number
EP1070994B1
EP1070994B1 EP00114686A EP00114686A EP1070994B1 EP 1070994 B1 EP1070994 B1 EP 1070994B1 EP 00114686 A EP00114686 A EP 00114686A EP 00114686 A EP00114686 A EP 00114686A EP 1070994 B1 EP1070994 B1 EP 1070994B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
image
printing apparatus
sensitivity
sens
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
EP00114686A
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German (de)
English (en)
Other versions
EP1070994A2 (fr
EP1070994A3 (fr
Inventor
Patrick Metzler
Karlheinz Dr. Peter
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.)
Eastman Kodak Co
Original Assignee
NexPress Solutions LLC
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Filing date
Publication date
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Publication of EP1070994A2 publication Critical patent/EP1070994A2/fr
Publication of EP1070994A3 publication Critical patent/EP1070994A3/fr
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Publication of EP1070994B1 publication Critical patent/EP1070994B1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition

Definitions

  • the invention relates to a printing device with an image cylinder, an image generating device for imaging the lateral surface of the image cylinder and a transfer cylinder, which transfers the image from the image cylinder to a substrate, wherein the transfer cylinder has an elastic jacket that at the image transfer area has a deformation of the image cylinder and one of the cylinders drives the other over friction.
  • Such printing devices are mainly found in color copiers with electrostatic Imaging application. Such a printing device is used, for example, in the EP 0 791 860 A2. To achieve high print quality, the Prints have high register accuracy. One tries this requirement with Measurements and controls of the image generation of the image cylinders, by aligning the pictures to each other so that the different colors printed exactly on top of each other. However, it has been found to be a source of error is present that does not refer to the mutual assignment, but to the Quality of the printing process for each individual color: due to an out-of-roundness of the image cylinder there are fluctuations in the angular velocity of the driven Cylinder, i.e. the image cylinder or the transfer cylinder.
  • the invention is therefore based on the object of a printing device at the outset mentioned type in such a way that register errors within the individual, pressure generated by a printing device can be avoided.
  • the object is achieved in that the radius of the image cylinder, the radius of the transfer cylinder, the material and the design of the elastic Jacket and the storage of the cylinders are selected and designed in such a way that for the cylinder driven by the friction one of changes in the Engagements - as a result of image cylinder out-of-round - dependent overdrive results in the possible image errors caused by the out-of-roundness of the image cylinder avoided, the engagement being the degree of deformation that it is determined to what extent the center distance between the image cylinder and Transfer cylinder is smaller than the sum of the radii of the image cylinder and Transfer cylinder.
  • the invention is based on the observation that the ovality of the image cylinder leads to another source of error ".
  • One of them is that a portion of the Image cylinder, which has a larger radius due to its out-of-roundness, not only is driven more slowly in terms of angular velocity, as is the case with rigid ones Surfaces is the case, but at the same time an acceleration through behavior of the elastic jacket. This is explained using a figure. Kick it So two image distorting effects that overlap and their tendency are opposed. The latter, however, does not in itself lead to the effects cancel each other out.
  • the invention is based on the knowledge that that it is possible to behave by setting different boundary conditions to achieve the elastic jacket, which leads to the abolition of the effects mentioned leads.
  • This behavior of the elastic jacket is that it is larger Radii of the image cylinder is compressed more than smaller ones and therefore must flow faster through the smaller gap " Adjustment of all relevant conditions the development of fluctuations the angular velocity, as in a drive with a rigid cylinder would prevent. An angular velocity error can occur in this way thus be eliminated at its source of origin in the area of friction, by making the selection and configurations such that the angular velocity of the cylinder driven by the friction despite a runout of the image cylinder is constant.
  • the image cylinder is included is equipped with a drive and drives the transfer cylinder or vice versa.
  • the transfer cylinder is preferably equipped with the drive and drives the image cylinder. This is a convenient flow of power because of the transfer cylinder then loaded on both sides.
  • the out-of-roundness of the image cylinder affects the image generation at first to the extent that lines that are transverse to the direction of movement of the image cylinder are further apart in the area of larger radii than in areas of smaller radii. The reason is that the imaged area with the same angular velocity and larger Radii is larger than for smaller radii. Without a countermeasure, too this causes an error of the type mentioned at the beginning. However, this too The behavior of the elastic jacket makes one fall in the opposite direction Effect.
  • This behavior of the elastic jacket is that when interacting with a larger radius, the elastic material more is pressed together and therefore its surface in the image transmission area more is pulled apart. This is the surface that is pulled apart stretched areas of an image from the image cylinder to the transfer cylinder applied. The surface then pulls in the contact area after the deformation between the image and transfer cylinders together, which further apart lines with large radii are merged more than that Lines with smaller radii because the deformation was less there. This effect corresponds the change in overdrive as a result of out-of-roundness Radius changes. So here, too, there are two opposite tendencies that are however, also do not cancel automatically.
  • Both error compensations can be achieved through a number of configurations of the Affect printing device.
  • the radius has an immediate effect on this of the image cylinder and the material and design of the elastic jacket as well the storage of the cylinders.
  • the radius of the transfer cylinder has only little influence if extreme values are chosen.
  • the selection of designs and material properties can be partially calculated, whereby they however, because of the large number of influencing factors, ultimately verified by tests and need to be corrected. In some cases, the values, properties and dimensions can also be determined by series of tests. In practice are part these configurations and selection options are specified within certain areas, so that the freely selectable factors must be changed so that the mentioned goals can be achieved.
  • the radii of Image cylinder and transfer cylinder due to the space requirement of the image generation device and other necessary or desirable devices.
  • the choice of materials for the elastic sheath is also limited, especially as far as possible Materials still have to meet other requirements, such as the behavior of the surface for image transmission, durability and low wear as well as good power transmission.
  • the mounting of the cylinders a fixed mounting is possible it is possible that at least one of the cylinders has a spring-loaded bearing, such that that depending on the out-of-roundness of the image cylinder, a change in the center distance is effected. Then the selected spring constant is one of those to achieve the desired success factors to be selected.
  • the achievement of a constant angular velocity of the driven cylinder can be achieved simultaneously with the compensation of the image errors caused by the out-of-roundness of the image cylinder.
  • the conditions for such a constant angular velocity can be determined by calculation, the decisive variables being the radius of the image cylinder (r PC ) and the sensitivity (Sens).
  • the sensitivity indicates the strength of the change in the ratio of the surface speed (V PC ) of the image cylinder to the surface speed (V IT ) of the transfer cylinder as a function of the engagement (Eng), the latter being the measure of the delivery and thus the deformation.
  • Sens M is the Sensitivity Magic, that is the sensitivity at which the angular velocity ( ⁇ PC or ⁇ IT ) of the driven cylinder no longer changes due to radius deviations ( ⁇ r PC ) of the image cylinder. Closely indicates the average engagement between the cylinders.
  • the material for the elastic sheath can be selected according to the Poisson's number ( ⁇ ) of the material.
  • the Poisson number results from the behavior of a material that is subjected to tensile forces.
  • the negative sign arises from the fact that the transverse expansion is a shrinkage is.
  • the relationship between Poisson's number and sensitivity is that the latter increases as the Poisson number increases.
  • the selection of the material for the elastic jacket can be made according to the compressibility of the material.
  • the compression module is a material constant. It applies here that the sensitivity also decreases as the compression module is reduced.
  • the compression module is the decisive material constant for the size of the sensitivity, especially with porous material. The more air or gas inclusions there are in a material, the lower the compression module and thus the sensitivity.
  • Such a porous configuration allows material such as rubber, which as a solid material has a high compression modulus, to be changed in such a way that the desired sensitivity, ie the sensitivity magic, is achieved.
  • the Sensitivity Magic can also be achieved by a corresponding Thickness of the elastic jacket is chosen.
  • the elastic jacket different layers.
  • the elastic jacket consists essentially of a highly elastic material and a in relation to it has a relatively hard, but still elastic cover layer.
  • An elastic layer is expediently used as the cover layer Material such as rubber, preferably selected polyurethane.
  • the elastic jacket consists essentially of a highly elastic Material consists in which at least a relatively hard intermediate layer is embedded is. This achieves a wide range for the adjustability of the sensitivity. This setting is made by the position and the modulus of elasticity of the inserted Interlayers.
  • a corresponding spring constant can also be selected to achieve a sensitivity magic (this is a sensitivity magic with regard to the overall system, i.e. including the elastic jacket and the spring-loaded bearing) ,
  • the spring action determines how much the change in radius ( ⁇ r PC ) acts as a change in engagement. This creates a virtual sensitivity, whereby the sensitivity decreases with increasing suspension.
  • ⁇ r PC change in radius
  • the spring-loaded bearings are expediently designed in such a way that the spring action acts only in the direction of the axis spacing change. This can prevent shifts in the image transmission area.
  • leaf springs are arranged which extend with their broad side transversely to the direction of the axis spacing change.
  • An expedient embodiment provides that at least one of the cylinders is mounted on journals which are spring-mounted on the housing and have pivot bearings in the interior of the cylinder. This largely prevents interference from vibrations or bends. To prevent vibrations it can also be provided that the spring-loaded bearings are provided with damping.
  • the printing device according to the invention is particularly suitable for use with color copiers electrostatic imaging, where the image on the image cylinder for everyone The print was rebuilt and then transferred to the substrate using a transfer cylinder is transmitted.
  • the printing device according to the invention is also for others Printing machines with one image cylinder and one transfer cylinder can be used, if an out-of-roundness of the image cylinder is to be corrected.
  • FIG. 1 shows the basic structure of the printing device 1 according to the invention. It consists of an image cylinder 2, on the lateral surface 4 of which an image is applied by means of an image generation device 3. This image is transferred in an image transfer area 8 from the image cylinder 2 to a transfer cylinder 5.
  • the transfer cylinder 5 transmits the image to a printing material 6, which is guided on a belt 22 past the transfer cylinder 5 in the direction of the arrow 23.
  • An impression cylinder 21 ensures the necessary counter pressure when the image is transferred to the printing material 6. It is also possible to provide a cylinder instead of the belt 22 which guides the printing material 6.
  • the transfer cylinder 5 has an elastic jacket 7, which has a thickness 12 having. This elastic jacket 7 is located on the core 20 of the transfer cylinder 5.
  • the transfer cylinder 5 is through the belt 22 in the direction of the arrow 25 driven and in turn drives the image cylinder 2 in the direction of the friction Arrow 24.
  • an embodiment is also possible in which the image cylinder 2 Transfer cylinder 5 drives in a corresponding manner or at the transfer cylinder 5 a drive is arranged.
  • the contact area 8 of the image cylinder 2 and the transfer cylinder 5 there is a deformation 9 of the elastic Sheath 7. The image transmission from the image cylinder takes place in this deformation area 2 to the transfer cylinder 5 instead.
  • the problem to be solved by the invention is that the radius r PC of the image cylinder 2 has deviations and these radius changes ⁇ r PC can become the cause of image errors.
  • a source of image errors - when looking at rigid cylinders - is that a friction-driven cylinder with different radii is driven more slowly at larger radii than at smaller radii and the resulting differences in angular velocity ⁇ PC would have the effect that the beginning of the image ( and thus the rest of the pictures) would be moved.
  • Another source of error is also related to changes in radius ⁇ r PC . This error occurs directly at the imaging device 3, since the lateral surface 4 moves past the imaging device 3 faster at the same angular velocity in an area of larger radii than in the area of smaller radii.
  • the extent of this deformation 9 is the engagement Eng, which is determined by the extent to which the center distance between the image cylinder 2 and the transfer cylinder 5 is smaller than the sum of the radii of the image cylinder r PC and the transfer cylinder r IT .
  • FIG. 2a shows a sketch to explain the principle of the invention. This is illustrated by FIG. 2b , which explains the principle according to the invention with an analog effect.
  • This highly elastic material 13 behaves similarly to a liquid 27 which - as shown in FIG. 2b - has to pass through a tube 26 which has a wide tube area 28, a constriction 29 and then again the wide tube area 28.
  • the elastic jacket 7 behaves in an analogous manner in the device according to the invention, as shown in FIG. 2a.
  • the flow speed "of the elastic material 13 in the area of greatest engagement Eng is accelerated to a maximum speed V IT in the nip , which is greater than the speed V X , which is in the area of a radius r X due to the angular speed ⁇ IT of the transfer cylinder 5 under normal circumstances
  • This V IT in the nip is the surface speed in the region of the deformation 9.
  • the surface speed V IT in the nip drives the image cylinder 2
  • the surface speed V IT in the nip is identical to the surface speed V PC of the driven image cylinder 2.
  • the effect mentioned would also occur if the image cylinder 2 would drive the transfer cylinder 5.
  • the driven cylinder for example the image cylinder 2
  • the driven cylinder is driven faster than this with rigid cylinders 2 and 5 would be the case.
  • the surfaces speed V PC greater than an imaginary surface speed V X of the transfer cylinder 5 at a radius r x and also greater than the surface speed V IT of the transfer cylinder 5 outside the nip, since it corresponds to the surface speed of the transfer cylinder in the nip V IT in the nip .
  • the ratio of the surface speed in the nip V IT in the nip to the surface speed of the transfer cylinder 5 outside the nips V IT is the overdrive. It is a measure of how much the image cylinder 2 is driven faster due to the effect described.
  • Another idea on which the invention is based is that another source of error can also be eliminated in this way.
  • This source of error consists in that the lateral surface 4 of the image cylinder 2, even at constant angular velocity ⁇ PC, runs faster past the image generating device 3 with larger radii than with smaller radii. The compensation of this error is described further below in relation to FIG. 5.
  • Fig. 3b there is also another effect shown in Fig. 3b , which must be considered as soon as it occurs to a greater extent, which in turn depends on the nature and structure of the elastic jacket 7.
  • the overdrive is a function of the torque in such a way that the overdrive V IT in the nip / V IT decreases with increasing torque.
  • the negative slope of the curve shown in the diagram in FIG. 3b is the sensitivity, which is dependent on the torque, this is Sens T. This counteracting effect was taken into account in the formula already described above by Sens T • T.
  • FIG. 4 shows a diagram for explaining the finding of the sensitivity magic, Sens M to be achieved according to the invention.
  • the radius r PC of the image cylinder 2 is plotted on the abscissa and the angular velocity ⁇ PC of the image cylinder 2 on the ordinate.
  • These changes in radius ⁇ r PC were considered to be deviations from an average radius r PC applied.
  • the sensitivity that results from the configuration of the elastic jacket 7 or the configuration of the spring-loaded bearing 11, one or the other of the effects described above predominates.
  • the ratio of the change in radius ⁇ r PC to a change in the angular velocity ⁇ PC of the image cylinder 2 is determined by line 31. This means that the larger the radius r PC , the lower the angular velocity ⁇ PC . For example, this is the normal effect on rigid surfaces of a driving and a driven cylinder when the radius changes. If the sensitivity is very high, that is to say a very high overdrive, the ratio of the change in radius ⁇ r PC to the change in angular velocity ⁇ PC is characterized by the course of line 32. This means that the angular velocity ⁇ PC increases with a larger radius r PC .
  • the sensitivity can be adjusted in such a way that it runs parallel to the abscissa by means of an appropriate nature of the elastic jacket 7, possibly with a spring-loaded bearing 11. Then the angular velocity ⁇ PC of the image cylinder 2 driven by friction is independent of changes in the radius r PC of the image cylinder 2. In this way it is ensured that, in spite of the out-of-roundness of the image cylinder 2, not only the angular velocity ⁇ IT of the driving transfer cylinder 5 but also the angular velocity ⁇ PC of the driven image cylinder 2 is constant. If this condition is met, an angular velocity error due to a non-roundness is eliminated at its point of origin, the friction between the two cylinders 2 and 5. This works regardless of whether the image cylinder 2 drives the transfer cylinder 5 or vice versa.
  • FIG. 5 shows a schematic diagram to explain the effects which are caused by a non-circular image cylinder 2.
  • a constant drive of the transfer cylinder 5, which gives it a constant angular velocity ⁇ PC is transmitted by the effects just described in such a way that the angular velocity ⁇ PC of the image cylinder 2 is constant, regardless of whether the radius r PC has differences ⁇ r PC or not.
  • this does not prevent the development of a further source of error, which consists in the fact that, at a constant angular velocity ⁇ PC, the lateral surface 4 passes the imaging device 3 faster with a larger radius r PC + ⁇ r PC than with a smaller radius r PC .
  • the surface of the elastic jacket 7 is stretched more with larger radii than in the area of smaller radii, and this expansion of the surface of the elastic jacket 7 changes after passing through the deformation 9 pulls together again in such a way that the image area stretched by the large radius r PC + ⁇ r PC on the lateral surface 4 is returned to its desired length.
  • Sensitivity Magic it is thus possible to prevent two error occurrences with one measure, in that the overdrive prevents angular velocity errors from occurring and eliminates the image errors just described during transmission to the transfer cylinder 5.
  • 6a and 6b show exemplary embodiments for the configuration of the elastic jacket 7 of the transfer cylinder 5.
  • FIG. 6a shows how a highly elastic material 13 is applied to the core 20 of the transfer cylinder 5 and is covered with a relatively hard cover layer 14. In this way, a surface that is optimal for image transmission can be combined with a highly elastic or compressible layer 13 in order to achieve the desired sensitivity.
  • FIG. 6b shows an embodiment of the elastic jacket 7 with an intermediate layer 15.
  • This intermediate layer 15 can, for example, consist of a harder material. Such an intermediate layer 15 enables the sensitivity to be specifically adjusted.
  • an elastic jacket 7 with an intermediate layer 15 can also be provided with a cover layer 14.
  • FIG. 7 shows an exemplary embodiment for a spring-loaded cylinder bearing 11.
  • An axle 17 is mounted in the housing 19 of the machine so that it can be moved in the direction of the double arrow 30.
  • the axle journal 17 can only move in one direction by arranging a leaf spring 16, this is the direction of the axle spacing change between two cylinders 2 and 5.
  • the rotary bearing 18, for example a ball bearing is located inside the cylinder 2 or 5, which is connected to the other cylinder 5 or 2 cooperates.
  • spring-loaded bearings 11 are a further possibility for influencing the sensitivity, which is then a virtual sensitivity, that is to say a sensitivity of the overall system. This sensitivity arises from a change in engagement due to the elastic change in distance.
  • the spring-loaded cylinder bearing is, for example, a possibility of nevertheless achieving the Sensitivity Magic despite a relatively hard material of the elastic jacket 13, for example when using a solid material.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Glass Compositions (AREA)
  • Noodles (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Claims (22)

  1. Dispositif d'impression (1) comprenant un cylindre gravé (2), un dispositif de génération d'images (3) pour garnir d'images la surface enveloppe (4) du cylindre gravé (2), et un cylindre de transfert (5) qui transfère l'image du cylindre gravé (2) sur un support à imprimer (6), le cylindre de transfert (5) possédant une enveloppe élastique (7) présentant une déformation (9) au niveau de la zone de transfert d'images (8) du cylindre gravé et l'un des cylindres (2 ou 5) entraínant l'autre par friction,
    caractérisé en ce que
    le rayon (rPC) du cylindre gravé (2), le rayon (rIT) du cylindre de transfert (5), le matériau et la configuration de l'enveloppe élastique (7) ainsi que le logement (10, 11) des cylindres (2, 5) sont choisis et configurés de telle sorte, que pour le cylindre (2 ou 5) entraíné par friction il résulte une surmultiplication VIT sur la ligne de contact VIT (à l'extérieur de la ligne de contact) en fonction de variations de l'engagement (eng) - suite à une ovalisation du cylindre gravé (2) - permettant d'éviter les défauts d'image possibles causés par l'ovalisation du cylindre gravé (2), l'engagement (eng) étant la valeur de la déformation (9) qui est déterminée en fonction du fait que l'entraxe entre le cylindre gravé (2) et le cylindre de transfert (5) est plus petit que la somme des rayons du cylindre gravé (rPC) et du cylindre de transfert (rIT).
  2. Dispositif d'impression selon la revendication 1,
    caractérisé en ce que
    le choix et les configurations sont réalisés de telle sorte que la vitesse angulaire (ωPC ou ωIT) du cylindre (2 ou 5) entraíné par friction reste constante malgré l'ovalisation du cylindre gravé (2).
  3. Dispositif d'impression selon la revendication 1 ou 2,
    caractérisé en ce que
    le choix et les configurations sont réalisés de telle sorte que des défauts d'image, qui sont engendrés par l'ovalisation du cylindre gravé (2) déjà lors de la garniture d'images de celui-ci, sont corrigés par la variation de la surmultiplication VIT sur la ligne de contact VIT suite aux variations de l'engagement (eng) causées par l'ovalisation du cylindre gravé (2), dès que la surface de l'enveloppe élastique (7) se détend après le passage de la déformation (9) au point de transfert d'images (8).
  4. Dispositif d'impression selon la revendication 1, 2 ou 3,
    caractérisé en ce que
    les cylindres (2, 5) sont logés de manière fixe.
  5. Dispositif d'impression selon la revendication 1, 2 ou 3,
    caractérisé en ce que
    l'un des cylindres (2, 5) présente un logement élastique (11) de telle sorte qu'en fonction de l'ovalisation du cylindre gravé (2) on obtient une variation de l'entraxe.
  6. Dispositif d'impression selon l'une quelconque ou plusieurs des revendications 1 à 5,
    caractérisé en ce que
    le cylindre gravé (2) est entraíné par le cylindre de transfert (5).
  7. Dispositif d'impression selon l'une quelconque ou plusieurs des revendications 2 à 4 ou 6,
    caractérisé en ce que
    le choix est réalisé de telle sorte que pour la sensitivité (Sens) - il s'agit de la variation du rapport entre la vitesse superficielle (VPC) du cylindre gravé (2) et la vitesse superficielle (VIT) du cylindre de transfert (5) en fonction de l'engagement (eng), ce dernier étant la valeur de la déformation (9) - la condition suivante est remplie : Sens = SensM = 1 + SensT · T rPC - Eng les grandeurs se définissant comme suit :
    SensM = Sensitivity Magic, qui est la sensitivité à laquelle la vitesse angulaire (ωPC ou ωIT) du cylindre entraíne (2 ou 5) ne varie plus suite à des écarts de rayon (Δ rPC) du cylindre gravé (2),
    rPC = rayon du cylindre gravé (2),
    Eng = engagement moyen entre les cylindres (2 et 5),
    SensM = variation du rapport entre la vitesse superficielle du cylindre gravé (2) et le cylindre de transfert (5), donc VPC VIT suite à la variation du couple de rotation,
    T = le couple de rotation moyen.
  8. Dispositif d'impression selon la revendication 7,
    caractérisé en ce que
    lorsque la variation de la sensitivité suite à des variations du couple de rotation est faible et peut donc être négligée pour remplir la condition, la condition suivante est remplie : SensM = 1rPC - Eng
  9. Dispositif d'impression selon la revendication 8,
    caractérisé en ce qu'
    au cas où le rayon (rPC) du cylindre gravé (2) est très grand par rapport à l'engagement (eng), ce dernier est négligé, la condition à remplir étant alors la suivante : SensM = 1rPC
  10. Dispositif d'impression selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    la Sensitivity Magic (SensM) est obtenue par un choix du matériau ainsi que par la configuration de l'enveloppe élastique (7) et la configuration du logement des cylindres (2, 5).
  11. Dispositif d'impression selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce que
    le choix du matériau pour l'enveloppe élastique (7) est réalisé selon le nombre de Poisson du matériau.
  12. Dispositif d'impression selon l'une quelconque des revendications 1 à 11,
    caractérisé en ce que
    le choix du matériau pour l'enveloppe élastique (7) est réalisé en fonction de la compressibilité du matériau.
  13. Dispositif d'impression selon la revendication 12,
    caractérisé en ce que
    pour l'enveloppe élastique (7) on choisit un matériau poreux.
  14. Dispositif d'impression selon l'une quelconque des revendications 7 à 13,
    caractérisé en ce qu'
    on choisit une épaisseur (12) de l'enveloppe élastique (7) pour obtenir la sensitivité (Sens) souhaitée.
  15. Dispositif d'impression selon l'une quelconque des revendications 1 à 14,
    caractérisé en ce que
    l'enveloppe élastique (7) est composée de plusieurs couches (13, 14, 15).
  16. Dispositif d'impression selon la revendication 15,
    caractérisé en ce que
    l'enveloppe élastique est réalisée pour l'essentiel à partir d'un matériau très élastique (13) et présente une couche de couverture (14) relativement dure par rapport à celui-ci mais encore élastique.
  17. Dispositif d'impression selon la revendication 15 ou 16,
    caractérisé en ce que
    l'enveloppe élastique (7) est réalisée pour l'essentiel à partir d'un matériau très élastique (13) dans lequel est insérée au moins une couche intermédiaire (15) relativement dure.
  18. Dispositif d'impression selon l'une quelconque des revendications 5 à 17,
    caractérisé en ce que
    pour obtenir la Sensitivity Magic (SensM) on choisit pour le logement élastique une constante élastique (11) appropriée.
  19. Dispositif d'impression selon l'une quelconque des revendications 5 à 18,
    caractérisé en ce que
    les logements élastiques (11) sont configurés de telle sorte que l'effet élastique n'agit que dans le sens de la variation de l'entraxe.
  20. Dispositif d'impression selon la revendication 19,
    caractérisé en ce que
    des ressorts à lames (16) s'étendent par leur côté large perpendiculairement au sens de la variation de l'entraxe.
  21. °) Dispositif d'impression selon l'une quelconque des revendications 5 à 20,
    caractérisé en ce que
    les logements élastiques (11) sont munis d'un amortissement.
  22. Dispositif d'impression selon l'une quelconque des revendications 5 à 21,
    caractérisé en ce qu'
    au moins l'un des cylindres (2 ou 5) est logé sur des tourillons (17) logés de manière élastique sur le carter (19) et présentant des coussinets de pivotement (18) à l'intérieur du cylindre.
EP00114686A 1999-07-23 2000-07-08 Dispositif d'impression Expired - Lifetime EP1070994B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934658 1999-07-23
DE19934658A DE19934658A1 (de) 1999-07-23 1999-07-23 Druckvorrichtung

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EP1070994A2 EP1070994A2 (fr) 2001-01-24
EP1070994A3 EP1070994A3 (fr) 2002-01-02
EP1070994B1 true EP1070994B1 (fr) 2004-09-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10208597B4 (de) * 2002-02-27 2013-03-21 Eastman Kodak Co. Verfahren zum Vermeiden von Registerfehlern bei einer Druckmaschine
DE102006009773A1 (de) * 2006-03-01 2007-09-06 Eastman Kodak Co. Verfahren zum Vermeiden eines Passerfehlers beim Drucken
DE102008045402A1 (de) * 2008-09-02 2010-03-04 Fischer & Krecke Gmbh Verfahren zum Betrieb einer Zentralzylinder-Druckmaschine
DE102008045403A1 (de) * 2008-09-02 2010-03-04 Fischer & Krecke Gmbh Verfahren zur Herstellung des Gleichlaufs meherer Druckzylinder
DE102010015628B4 (de) * 2009-04-20 2017-11-23 Lenze Automation Gmbh Verfahren zur Drehzahlsteuerung von Walzen in einer Druckmaschine

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Publication number Priority date Publication date Assignee Title
JP2629815B2 (ja) * 1988-05-07 1997-07-16 キヤノン株式会社 画像形成装置
DE69031779T2 (de) * 1989-08-14 1998-06-18 Indigo Nv Bildübertragungsgerät und -verfahren
JPH04281485A (ja) * 1991-03-08 1992-10-07 Fujitsu Ltd 像転写装置
GB2283702B (en) * 1993-10-13 1997-04-09 Seiko Epson Corp Contact transfer device and image forming equipment
US5732314A (en) * 1993-11-26 1998-03-24 Canon Kabushiki Kaisha Image forming apparatus comprising image bearing member, intermediate image transfer member and secondary image transfer member for facilitating transfer of developed image from intermediate image transfer member to transfer material
EP0747785B1 (fr) * 1995-06-06 2002-02-20 Canon Kabushiki Kaisha Appareil de formation d'images et élément de transfert intermédiaire
KR100200620B1 (ko) * 1996-09-13 1999-06-15 윤종용 양면인쇄가 가능한 전자사진방식 프린터
JPH10207259A (ja) * 1997-01-16 1998-08-07 Fuji Xerox Co Ltd 画像形成装置
JP3627452B2 (ja) * 1997-06-23 2005-03-09 富士ゼロックス株式会社 画像記録装置および画像記録方法
JPH11190925A (ja) * 1997-12-25 1999-07-13 Canon Inc 画像形成装置

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Publication number Publication date
EP1070994A2 (fr) 2001-01-24
ATE277368T1 (de) 2004-10-15
EP1070994A3 (fr) 2002-01-02
DE50007852D1 (de) 2004-10-28
DE19934658A1 (de) 2001-01-25

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