EP3678868B1 - Dispositif d'impression directe pour l'application d'une image imprimée périphérique - Google Patents

Dispositif d'impression directe pour l'application d'une image imprimée périphérique Download PDF

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Publication number
EP3678868B1
EP3678868B1 EP18746888.9A EP18746888A EP3678868B1 EP 3678868 B1 EP3678868 B1 EP 3678868B1 EP 18746888 A EP18746888 A EP 18746888A EP 3678868 B1 EP3678868 B1 EP 3678868B1
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European Patent Office
Prior art keywords
container
orientation
feature
direct printing
actual
Prior art date
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Active
Application number
EP18746888.9A
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German (de)
English (en)
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EP3678868A1 (fr
Inventor
Anton Niedermeier
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Krones AG
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Krones AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/40—Printing on bodies of particular shapes, e.g. golf balls, candles, wine corks

Definitions

  • the invention relates to a direct printing device for applying a circulating printed image to containers with at least one container seam.
  • Container seams due to the manufacturing process. These are often press seams, with a container then typically having two opposite container seams running in the longitudinal direction. Container seams are particularly pronounced on glass containers, but plastic containers also have container seams that are still visible. Tank seams usually run along the longitudinal axis of the tank and extend over the entire length of the tank.
  • the invention is based on the object of providing a direct printing device and a direct printing method for applying a circumferential printed image to containers with container seams, which enable an improved appearance of the imprint with fewer imperfections.
  • the direct printing device for applying a circulating print image to containers comprises a print head, in particular a print head that works according to the drop-on-demand principle and is designed for direct printing on a container, a detection device that is designed in such a way that at least one specified feature of the Container, for example a marking, a relief, an embossing, the container seam or another feature that is in a fixed angular relationship to the container seam, a computing device that is designed based on the at least one Feature to determine whether and, if necessary, how the container must be aligned in order to be brought from an actual container orientation to a predetermined target container orientation, and an alignment device for aligning the container in the target container orientation based on the determination of the computing device is trained.
  • the desired container alignment is specified in such a way that the container seam is aligned with respect to the print head in such a way that a print seam that is produced when a circumferential print image is applied essentially coincides with the container seam.
  • a device designed in this way makes it possible for the unavoidable pressure seam not to represent an additional visual defect. Since the pressure seam is very narrow anyway and coincides with the tank seam, the pressure seam itself is not noticeable. This improves the appearance of the print as the number of visible seams is reduced.
  • a circumferential print image means here in particular a print image that runs around the entire circumference of the container or, in other words, around 360° (possibly with minor deviations, for example due to inaccuracies during printing).
  • the at least one feature can, for example, include at least one, in particular precisely one or precisely two, markings.
  • the at least one feature can include a tank seam, in particular exactly one or exactly two tank seams.
  • features of the container is advantageous because it can be comparatively computationally intensive to detect the entire container and to calculate the orientation therefrom. In most cases, one feature or very few features are sufficient to reflect the container orientation very precisely and the computational effort is greatly reduced. It is also conceivable for a container to have two container seams. Then it may not be possible (e.g. for reasons of symmetry, e.g. if the container seams are exactly opposite each other) to determine the container orientation unambiguously without using additional features. In some cases, such an unambiguous determination is not even necessary, because it is paramount that one of the container seams is in the appropriate position for direct printing.
  • the alignment device can be designed in such a way that, after the container has been aligned, the container seam is arranged at the point at which the circulating pressure begins and/or ends during operation.
  • the print begins or ends is determined, for example, by the geometry of the transport route, the arrangement of the print head(s) and, if applicable, other parameters of the printing device. the respective For example, the position can be calculated for the corresponding parameters and/or determined empirically and then stored in a memory device.
  • the computing device can be designed in such a way that it determines the actual position of the at least one feature and that, based on the actual position of the at least one feature and a predetermined target position of the at least one feature, it determines whether and, if necessary, how the container is aligned must become.
  • the use of a feature is particularly suitable for recognizing the container orientation. If an actual and a target position of the feature are used to determine whether and, if so, how the container must be aligned, it is not necessary to carry out an actual spatial determination of the container orientation (and, associated with this, possibly recognizing the container geometry), which can be complex and computationally intensive. Rather, a comparatively simple comparison of individual characteristics is sufficient. As an example, it may suffice that a marking on the container or a container seam, which can be recognized comparatively easily, is detected and then it is determined at which position it should actually be. A differential value can be formed from this, for example. This value can then be used to calculate how the container must be aligned.
  • corresponding instructions or values can already be stored in a storage device for the respective difference values, which describe how the container must be aligned when a specific difference value is present.
  • a group of parameters can be stored for a specific differential value, which the alignment device sets for aligning the containers.
  • the computing device can be designed in such a way that it determines the actual position of the at least one feature, that it determines the actual container orientation based on the actual position of the at least one feature and that it based on the actual container orientation and the target container orientation , determines whether and, if so, how the container must be aligned.
  • the alignment device requires the container alignment as input values and a difference value as described above is not sufficient is.
  • the container orientation is required anyway for other process steps, so that it makes sense to also determine this for determining whether and how the container has to be aligned.
  • the detection device can be designed in such a way that the at least one feature is detected optically, and the computing device can be designed in such a way that a or the actual position of the at least one feature is determined with the aid of image recognition. It is possible to use visible light for optical detection. Alternatively, however, it is also conceivable to use optical detection in other wavelength ranges.
  • Optical detection is advantageous because optical features can be applied particularly easily or because the container seams are optically recognizable anyway and because optical measurement methods, for example using a camera, are inexpensive and uncomplicated. It may even be possible to adapt existing systems, for example for optical quality control, accordingly.
  • the detection device can include a camera that images at least a partial area of the container, the at least one partial area being selected in such a way that it is ensured that the at least one feature lies in the at least one partial area, regardless of the actual container orientation.
  • the container has at least two features, for example both the container seam and a marking and/or two container seams and/or two markings, which are arranged in such a way, for example opposite one another, that it is sufficient to depict only a partial area of the container .
  • the alignment device can be designed to rotate the containers around their own axis. Particularly when the containers are transported in a guided manner, it can be sufficient to simply turn them for suitable alignment.
  • the alignment device can be designed in such a way that an angle by which the containers are rotated during alignment depends at least on the actual container alignment and the specified desired container alignment. If necessary, a transport path remaining between the alignment device and the print head can also be used for the container be taken into account, especially if this is not straight but, for example, on a circular path.
  • the invention also provides a direct printing method.
  • At least one predetermined feature of the container for example a marking or the container seam
  • a computing device based on the at least one feature determines whether and, if so, how container must be aligned in order to be brought from an actual container orientation to a predetermined target container orientation, the container is aligned in the target container orientation based on the determination of the computing device, and the container is printed by means of a print head after the container has been aligned.
  • the desired container alignment is specified in such a way that the container seam is aligned with respect to the print head in such a way that a print seam that occurs when a circumferential print image is applied essentially coincides with the container seam.
  • Orientation of the container may be such that after orientation of the container, the container seam is located at the location where the circumferential pressure begins and/or ends.
  • the direct printing method can include determining the actual position of the at least one feature and, based on the actual position of the at least one feature and a predetermined target position of the at least one feature, determining whether and, if so, how the container must be aligned.
  • the direct printing method can include determining the actual position of the at least one feature, determining the actual container orientation based on the actual position of the at least one feature, and determining whether and based on the actual container orientation and the target container orientation if necessary, how the container must be aligned.
  • the direct printing method can include that the at least one feature is detected optically, in particular by means of at least one camera, and a or the actual position of the at least one feature is determined with the aid of image recognition.
  • the direct printing method can include imaging at least a partial area of the container, the at least one partial area being selected such that it is ensured that the at least one feature lies in the at least one partial area regardless of the actual container orientation.
  • the direct printing method can include the container being rotated about its own axis in order to align the container, in particular by an angle which depends at least on the actual container orientation and the predetermined target container orientation.
  • Figure 1a schematically shows a printed image, as is achieved with a printing device known from the prior art.
  • a container 2 with two container seams 3a and 3b is shown here.
  • the pressure seam 4 is also shown.
  • FIG. 1b shows Figure 1b schematically a printed image, as with a direct printing device according to the invention, for example below in connection with figure 2 described device, is achieved. It is indicated here that the pressure seam 4 coincides with one of the container seams, here the container seam 3a, or essentially coincides with it.
  • figure 2 is a schematic representation, not true to scale, of a possible embodiment of the direct printing device 1 according to the invention.
  • a print head 5 for the direct printing of containers, a detection device 6, a computing device 7 and an alignment device 8 are shown schematically in the figure.
  • Containers 2 are transported on a transport path, which is linear here.
  • the containers could be bottles. These could, for example, be transported hanging from the bottle neck.
  • it can be a rotary machine, in which the containers are transported on a circular transport path.
  • standing transport is also possible, for example in a puck, or transport in which the containers stand on a plate and are held from above with a centering device.
  • the detection device which is designed to detect at least one predetermined feature of the container, is arranged along the transport route of the containers in such a way that the containers, in particular features on the containers, can be detected.
  • a camera can be provided here, which images a predetermined section of the transport route.
  • features on the containers that can be detected by means of the detection device can be, for example, markings that were applied to containers in previous steps.
  • markings that were applied to containers in previous steps.
  • such features can also be pressure seams or other shapes of the container, by means of which the orientation of the container can be determined.
  • the direct printing device is designed here in such a way that the detection device forwards data to the computing device.
  • the computing device is designed to determine, based on the data received from the detection device, whether and, if so, how the container must be aligned in order to be brought from an actual container alignment to a predefined target container alignment.
  • the actual container orientation is calculated. Rather, it is sufficient that it can be determined in some form, for example by querying value tables, with which parameters the alignment device must be operated when the detection device has detected a specific feature at a specific position. In this way, it is still possible to bring the container from the actual to the target container orientation without explicitly specifying the actual or target container orientation.
  • the alignment device is shown, which is designed for aligning containers in order to bring them from an actual container alignment to a predetermined desired container alignment.
  • the alignment device can in particular be designed to rotate the containers around their own axis by a predetermined angle. However, a translational movement of the containers is also not ruled out.
  • the direct printing device is designed in such a way that the alignment device receives data from the computing device, in particular in such a way that it is based on corresponding results of the computing device brings the container into the target container orientation.
  • the desired container alignment is specified in such a way that the container seam is aligned with respect to the print head in such a way that a print seam that occurs when a circumferential print image is applied essentially coincides with the container seam.
  • the detection device can be connected to the computing device via a data connection 10 and the alignment device can be connected to the computing device via a data connection 11 .
  • the computing device it is also conceivable for the computing device to be formed integrally with the detection device or the alignment device. In particular, the detection device, computing device and alignment device could also be formed integrally.
  • the direct printing system is loaded with containers.
  • the containers are transported along a transport route.
  • the containers run past a detection device. This detects, for example optically, features of the containers. If they are not already aligned in a target alignment, the containers are then aligned by means of an alignment device, for example rotated and/or displaced about their axis, so that they are brought into a target alignment.
  • the containers are then directly printed all around using the print head. To do this, either the containers can be rotated and/or the print head can be moved around the containers.
  • the features detected by the detection device are used to determine whether and how the containers must be aligned. These can be used, for example, to determine the actual actual container orientation. This can then be compared with the target container orientation and it can thus be determined whether and how the containers have to be aligned. Alternatively, based on the positions of the features, that is to say without determining the container orientation, it can also be determined whether and how the container must be aligned. For example, specific parameters for the alignment device can be stored for specific positions of the features.
  • containers often have two opposing container seams (due to the manufacturing process). Then, under certain circumstances, the orientation of the container cannot be clearly determined based on the position of a container seam. However, as ultimately the alignment of the container to the proper alignment of one of the container seams it is not necessarily relevant how the container itself is oriented, as long as the orientation of one of the container seams is known and can be adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Ink Jet (AREA)
  • Printing Methods (AREA)
  • Image Processing (AREA)

Claims (15)

  1. Dispositif d'impression directe (1) pour appliquer une image imprimée circonférentielle sur un récipient (2) avec au moins une jointure de récipient (3a, 3b), comprenant
    une tête d'impression (5) constituée pour l'impression directe d'un récipient (2),
    un dispositif de détection (6) constitué de manière à ce que soit captée au moins une caractéristique donnée du récipient (2), par exemple un marquage ou la jointure de récipient (3a, 3b),
    un dispositif de calcul (7) constitué pour déterminer si, et le cas échéant comment, le récipient (2) doit être orienté, sur la base de ladite au moins une caractéristique, pour l'amener d'une orientation de récipient actuelle à une orientation de récipient désirée donnée, et
    un dispositif d'orientation (8) constitué pour orienter le récipient (2) dans l'orientation de récipient désirée sur la base de la détermination du dispositif de calcul (7),
    dans lequel l'orientation de récipient désirée est donnée de telle sorte que la jointure de récipient est orientée par rapport à la tête d'impression (5) pour qu'une jointure d'impression (4), qui apparaît lors de l'application d'une image d'impression circonférentielle, recouvre substantiellement la jointure de récipient (3a, 3b) .
  2. Dispositif d'impression directe (1) selon la revendication 1, dans lequel le dispositif d'orientation est constitué de telle sorte que, après l'orientation du récipient (2), la jointure de récipient (3a, 3b) soit agencée à la position à laquelle, en fonctionnement, l'impression circonférentielle commence et/ou finit.
  3. Dispositif d'impression directe (1) selon la revendication 1 ou 2, dans lequel le dispositif de calcul (7) est constitué de manière à déterminer la position actuelle de ladite au moins une caractéristique et à déterminer si, et le cas échéant comment, le récipient doit être orienté sur la base de la position actuelle de ladite au moins une caractéristique et d'une position désirée donnée de ladite au moins une caractéristique.
  4. Dispositif d'impression directe (1) selon l'une des revendications précédentes, dans lequel le dispositif de calcul (7) est constitué de manière à déterminer la position actuelle de ladite au moins une caractéristique, à déterminer l'orientation de récipient actuelle sur la base de la position actuelle de ladite au moins une caractéristique, et à déterminer, sur la base de l'orientation de récipient actuelle et de l'orientation de récipient désirée, si, et le cas échéant comment, le récipient (2) doit être orienté.
  5. Dispositif d'impression directe (1) selon l'une des revendications précédentes, dans lequel le dispositif de détection (6) est constitué de telle sorte que ladite au moins une caractéristique est détectée optiquement, et dans lequel le dispositif de calcul (7) est constitué de telle sorte qu'une ou la position actuelle de ladite au moins une caractéristique est déterminée à l'aide d'une analyse d'image.
  6. Dispositif d'impression directe (1) selon l'une des revendications précédentes, dans lequel le dispositif de détection (6) comporte une caméra qui prend en image au moins une partie du récipient (2), dans lequel ladite au moins une partie est sélectionnée de manière à assurer que ladite au moins une caractéristique se trouve dans ladite au moins une partie, indépendamment de l'orientation de récipient actuelle.
  7. Dispositif d'impression directe (1) selon l'une des revendications précédentes, dans lequel le dispositif d'orientation (8) est constitué pour faire tourner le récipient (2) autour de son propre axe.
  8. Dispositif d'impression directe (1) selon la revendication 7, dans lequel le dispositif d'orientation (8) est constitué de telle sorte qu'un angle selon lequel le récipient (2) doit être tourné lors de l'orientation dépend au moins de l'orientation de récipient actuelle et de l'orientation de récipient désirée donnée.
  9. Procédé d'impression directe pour appliquer une image imprimée circonférentielle sur un récipient (2) avec au moins une jointure de récipient (3a, 3b), dans lequel
    au moins une caractéristique donnée du récipient, par exemple un marquage ou la jointure de récipient (3a, 3b), est détectée par un dispositif de détection,
    un dispositif de calcul (7) détermine, sur la base de ladite au moins une caractéristique, si, et le cas échéant comment, le récipient (2) doit être orienté pour l'amener d'une orientation de récipient actuelle à une orientation de récipient désirée donnée, et
    le récipient (2) est orienté dans l'orientation de récipient désirée sur la base de la détermination du dispositif de calcul (7), et
    le récipient (2) est imprimé à l'aide d'une tête d'impression (5) après l'orientation du récipient (2),
    dans lequel l'orientation de récipient désirée est donnée de telle sorte que la jointure de récipient (3a, 3b) est orientée par rapport à la tête d'impression (5) pour qu'une jointure d'impression (4), qui apparaît lors de l'application d'une image d'impression circonférentielle, recouvre substantiellement la jointure de récipient (3a, 3b) .
  10. Procédé d'impression directe selon la revendication 9, dans lequel, après l'orientation du récipient (2), la jointure de récipient (3a, 3b) est agencée à la position dans laquelle l'impression circonférentielle commence et/ou se termine.
  11. Procédé d'impression directe selon la revendication 9 ou 10, dans lequel la position actuelle de ladite au moins une caractéristique est déterminée, et dans lequel il est déterminé si, et le cas échéant comment, le récipient (2) doit être orienté sur la base de la position actuelle de ladite au moins une caractéristique et d'une position désirée donnée de ladite au moins une caractéristique.
  12. Procédé d'impression directe selon l'une des revendications 9 à 11, dans lequel la position actuelle de ladite au moins une caractéristique est déterminée, l'orientation de récipient actuelle est déterminée sur la base de la position actuelle de ladite au moins une caractéristique, et il est déterminé si, et le cas échéant comment, le récipient (2) doit être orienté sur la base de l'orientation de récipient actuelle et de l'orientation de récipient désirée.
  13. Procédé d'impression directe selon l'une des revendications 9 à 12, dans lequel ladite au moins une caractéristique est détectée optiquement, en particulier à l'aide d'une caméra, et une ou la position actuelle de ladite au moins une caractéristique est déterminée à l'aide d'une analyse d'image.
  14. Procédé d'impression directe selon l'une des revendications 9 à 13, dans lequel au moins une partie du récipient (2) est prise en image, dans lequel ladite au moins une partie est sélectionnée de manière à assurer que ladite au moins une caractéristique se trouve dans ladite au moins une partie, indépendamment de l'orientation de récipient actuelle.
  15. Procédé d'impression directe selon l'une des revendications 9 à 14, dans lequel le récipient (2) est tourné autour de son axe propre pour orienter le récipient (2), en particulier selon un angle qui dépend au moins de l'orientation de récipient actuelle et de l'orientation de récipient désirée donnée.
EP18746888.9A 2017-09-04 2018-07-25 Dispositif d'impression directe pour l'application d'une image imprimée périphérique Active EP3678868B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017215481.0A DE102017215481A1 (de) 2017-09-04 2017-09-04 Direktdruckvorrichtung zum Aufbringen eines umlaufenden Druckbildes
PCT/EP2018/070095 WO2019042663A1 (fr) 2017-09-04 2018-07-25 Dispositif d'impression directe pour l'application d'une image imprimée périphérique

Publications (2)

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EP3678868A1 EP3678868A1 (fr) 2020-07-15
EP3678868B1 true EP3678868B1 (fr) 2022-08-10

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US (1) US11235592B2 (fr)
EP (1) EP3678868B1 (fr)
CN (1) CN111051067B (fr)
DE (1) DE102017215481A1 (fr)
WO (1) WO2019042663A1 (fr)

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DE102017215481A1 (de) 2019-03-07
CN111051067B (zh) 2021-05-11
CN111051067A (zh) 2020-04-21
WO2019042663A1 (fr) 2019-03-07
US11235592B2 (en) 2022-02-01
EP3678868A1 (fr) 2020-07-15
US20210060974A1 (en) 2021-03-04

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