EP3473446B1 - Rundtisch-digitaldruckmaschine und druckwerk - Google Patents

Rundtisch-digitaldruckmaschine und druckwerk Download PDF

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Publication number
EP3473446B1
EP3473446B1 EP17196877.9A EP17196877A EP3473446B1 EP 3473446 B1 EP3473446 B1 EP 3473446B1 EP 17196877 A EP17196877 A EP 17196877A EP 3473446 B1 EP3473446 B1 EP 3473446B1
Authority
EP
European Patent Office
Prior art keywords
print head
printing
interface
unit
rotary table
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.)
Active
Application number
EP17196877.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3473446A1 (de
Inventor
Joachim Weber
Joachim Schulz
Michael Sonntag
Florian Goller
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.)
Hinterkopf GmbH
Original Assignee
Hinterkopf GmbH
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 Hinterkopf GmbH filed Critical Hinterkopf GmbH
Priority to EP17196877.9A priority Critical patent/EP3473446B1/de
Priority to ES17196877T priority patent/ES2823252T3/es
Priority to US16/149,705 priority patent/US10696068B2/en
Priority to CA3020116A priority patent/CA3020116A1/en
Priority to TW107136307A priority patent/TWI775967B/zh
Priority to JP2018195840A priority patent/JP7231189B2/ja
Priority to IL262436A priority patent/IL262436B/he
Priority to CN201811208564.9A priority patent/CN109664613B/zh
Publication of EP3473446A1 publication Critical patent/EP3473446A1/de
Application granted granted Critical
Publication of EP3473446B1 publication Critical patent/EP3473446B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • 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
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/543—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements with multiple inkjet print heads
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/17—Cleaning arrangements
    • 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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0082—Digital printing on bodies of particular shapes
    • B41M5/0088—Digital printing on bodies of particular shapes by ink-jet printing

Definitions

  • the invention relates to a rotary table digital printing machine for printing workpieces in an inkjet digital printing process.
  • the invention also relates to a printing unit for use in such a rotary table digital printing machine.
  • From the EP 2 860 036 A1 is a printing device for printing a circumferential surface of a workpiece, with at least two print heads, each of which has at least one row arrangement of ink metering elements, in particular ink nozzles, which are each designed for an individually predeterminable delivery of ink to the workpiece, with at least one of the print heads movable lengthways an axis of extent of the ink metering elements is arranged on a print head carrier and wherein the movably mounted print head is assigned an electrically controllable setting device for setting a relative position with respect to the at least one further print head.
  • the JP 2016 159 583 A shows a rotary table digital printing machine for printing workpieces in an inkjet digital printing process with a machine frame and a workpiece rotary table, the machine frame comprising at least one holding device that is designed to accommodate workstations that are set up to process workpieces.
  • the object of the invention is to provide a rotary table digital printing machine and a printing unit which ensure improved reproducibility of a print result.
  • the rotary table digital printing machine comprises a machine frame on which a workpiece rotary table is mounted rotatably about an axis of rotation, which is provided with several workpiece carriers arranged at the same angular division and at the same distance from the axis of rotation and to which a drive device for providing a rotary step movement is assigned
  • Machine frame comprises at least one holding device which is designed to accommodate work stations that are set up for processing workpieces, as well as at least one work station attached to the holding device, which is designed as a printing unit for printing workpieces
  • the printing unit comprises a support frame which is used for Receiving an inking unit and a printhead module is formed and which has a printing unit interface which is designed for coupling to a printing unit receptacle associated with the holding device, the support frame having a printhead cut has tstelle which is designed for coupling with a printhead module, with a printhead module which is designed for a delivery of printing
  • the workpieces can in particular be tubular bodies made of metal or plastic, which are used, for example, as blanks for the production of aerosol cans or plastic tubes.
  • the holding device is designed as an annular plate and is arranged above the workpiece rotary table, a central axis of the holding device preferably being aligned parallel to the axis of rotation.
  • the holding device is designed as an integral part of the machine frame and serves to accommodate work stations, at least one of these work stations being designed as a printing unit for printing workpieces.
  • Further workstations can be designed to prepare the workpieces received on the workpiece carriers and conveyed in the course of a rotary step movement from one workstation to the next for carrying out the printing process provided with the at least one printing unit or to carry out further work steps on the workpiece after the printing process has been carried out.
  • several printing units are attached to the holding device, which are designed, for example, for printing the workpiece with different colors.
  • the printing unit comprises a carrier frame on which a printing unit interface is formed, which is designed to fix the printing unit to a printing unit receptacle, the printing unit receptacle being coupled to the holding device.
  • the support frame preferably comprises two frame parts which are arranged at a distance from one another and which together with the printhead interface form a U-shaped profile, the frame parts forming the lateral U-legs. It can be provided here that the inking unit is adjacent to Printing unit interface is arranged between the two frame parts, while the printhead module is arranged on a side of the inking unit facing away from the printing unit interface.
  • the print head carrier comprises a carrier interface which is adapted to a print head interface of the carrier frame in such a way that when the print head module is dismantled from the carrier frame, as may be required for maintenance purposes, for example, as well as a subsequent assembly of the same or a other printhead module on the support frame no or only very little adjustment work for the alignment of the printhead module with respect to the workpiece carriers and the workpieces received thereon have to be carried out.
  • the printing unit holder, the printing unit interface, the inking unit, the printhead interface, the carrier interface and the printhead module form a series arrangement that runs along the Direction of printing is aligned.
  • a compact arrangement of the components is made possible, so that dimensional deviations and tolerances of the mechanically coupled components have less of an influence than with a spatially expansive arrangement.
  • the series arrangement of the mechanical interfaces of the components also ensures an at least largely symmetrical force transmission between the components, which also ensures precise alignment of the at least allows a print head opposite the holding device and the workpiece carriers.
  • the carrier interface and the printhead interface comprise two pairs of centering means which are designed for a reproducible positioning of the printhead carrier on the carrier frame.
  • a pair of centering means comprises a high-precision plug connection which is formed in particular by a dowel pin and a corresponding recess designed as a fit, the dowel pin being assigned to one of the interfaces and the recess being assigned to the respective other interface. Since two pairs of centering means are provided, it is also necessary that the centering means assigned to the respective interface are arranged with high precision and that the arrangement exactly matches the arrangement of the centering means at the other interface, since only in this case a coupling of the two centering means pairs is possible .
  • the at least one printhead is arranged in a predeterminable arrangement opposite the at least two centering means formed on the printhead carrier. This ensures that when a first printhead module is exchanged for a second printhead module, the at least one printhead arranged on the second printhead module assumes exactly the same position relative to the holding device and the workpiece carriers as the at least one printhead of the first printhead module.
  • the centering means are used as a reference for mounting the respective printhead on the printhead carrier and that the respective printhead can be displaced before it is finally fixed on the printhead carrier until it assumes a predetermined position in relation to the centering means.
  • the carrier interface and / or the printhead interface comprise a plane surface oriented normal to the printing direction, at least two centering means being arranged on the plane surface.
  • the flat surface serves to align the print head carrier with respect to the carrier frame and thus supports the precise assembly of the print head module on the carrier frame.
  • the printhead interface is movably attached to the carrier frame with one, in particular exactly one, degree of freedom of movement and that an adjusting device is provided for initiating an, in particular linear, adjusting movement between the carrier frame and the carrier interface.
  • an adjusting device is provided for initiating an, in particular linear, adjusting movement between the carrier frame and the carrier interface.
  • This creates a relative movement of the printhead interface with the printhead module fixed thereon with respect to the carrier frame, for example to enable an adaptation of a spatial position of the at least one printhead with respect to the workpiece carriers.
  • the actuating device is designed to provide a linear movement, one axis of movement of this linear movement running in the radial direction and thus transversely (at right angles) to the axis of rotation of the workpiece rotary table.
  • a linear displacement of the print head module can be provided for the execution of a printing process.
  • This is of particular interest when the workpiece carriers are aligned in such a way that the central axes of the workpieces are aligned transversely (at right angles) to the axis of rotation of the workpiece rotary table and when the workpieces rotate around their central axis while the printing process is being carried out.
  • a spiral print image is produced on the outer surface of the workpiece.
  • the inking unit comprises a control device, a color line for a printing ink supply and a delivery line for a printing ink delivery to the printhead module, wherein the color line and the delivery line are connected to a valve device which is designed to influence a printing ink volume flow in the delivery line, and wherein the control device is designed to control the valve device and / or the at least one print head.
  • the main task of the inking unit is therefore to provide the printing ink conveyed via the ink line in a suitable quantity to the printhead module.
  • the inking unit comprises the valve device, which is preferably designed as a proportional valve and provides the desired printing ink volume flow to the print head module as a function of a control signal from the control device.
  • the control device can be provided for controlling the print head, which is in particular an inkjet print head based on piezo technology.
  • the printhead module comprises at least two printheads, each of which has a plurality of printing nozzles which are arranged in the same spacing along a radial direction and each form a row of nozzles, the rows of nozzles of the printing heads being arranged parallel to one another and at least one of the printing heads having a positioning device for a linear adjustment of the respective print head in the radial direction is assigned relative to the print head carrier, the control device being designed for controlling the print heads and the positioning device.
  • the print head module can be adapted to different workpiece diameters.
  • the control device is responsible for controlling the positioning device, which can in particular be a piezoelectric actuator, and for controlling the print heads, whereby, depending on the relative position of the print heads to one another, individual nozzles of the print heads may be used for the respective printing process temporarily complete can be deactivated in order to avoid undesired overlapping of print points in the print image.
  • At least one adjustment device for influencing a spatial alignment of the printing unit interface with respect to the holding device is arranged between a printing unit receptacle formed on the holding device and the holding device.
  • the setting device can be used to influence parallelism between the rows of nozzles of the print heads and the central axes of the workpieces or the workpiece carriers designed as spindles.
  • the setting device can be used to adjust a radial position of the print heads, that is to say a distance to the axis of rotation.
  • a setting of an axial offset between the rows of nozzles of the print heads and the central axes of the workpieces with the setting device is also provided.
  • the setting device can also be designed for an angle setting between the rows of nozzles of the print heads and the central axes of the workpieces.
  • an inking module arranged adjacent to the printing unit interface is arranged at an end region of the row arrangement opposite the printhead module and is connected to an ink line which is designed for supplying printing ink to the inking unit.
  • the task of the color preparation module is to prepare the printing ink conveyed from an ink reservoir for use in the printing unit. Due to the intended arrangement of the color preparation module at an end area of the row arrangement which is opposite to the printhead module, an advantageous conveying path for the printing ink can be achieved, since the printing ink is conveyed starting from the color preparation module into the adjacent color module along the row arrangement and from there can continue to flow along the row arrangement to the printhead module in order to be fed to the printheads there.
  • the ink preparation module has a pump device for conveying printing ink and / or a printing ink store for intermediate storage of printing ink and / or a temperature control device for temperature control of the printing ink and / or a degassing device for degassing the printing ink and / or comprises a filter device for filtering the printing ink.
  • the ink preparation module preferably comprises at least one temperature control device for controlling the temperature of the printing ink, a degassing device designed to separate gas bubbles from the printing ink, and a spring device to remove any remaining particles from the printing ink before it is transported to the inking unit, which could clog the printing nozzles , to free.
  • a pumping device and / or a printing ink storage device can be provided, the pumping device being designed to convey the printing ink from an ink storage device and the printing ink storage device serving to buffer and calm the conveyed printing ink before it is fed to temperature control and degassing and filtering.
  • a drying module is arranged in a row and attached to the machine frame, which with the print head module delimits a workpiece gap in the printing direction and that for the provision of drying energy is formed on a workpiece arranged in the workpiece gap.
  • the drying module is designed to provide thermal energy or energy in the form of electromagnetic radiation, in particular ultraviolet radiation, to ensure rapid and efficient curing of the printing ink on the surface of the workpiece. Due to the arrangement of the drying module in the row arrangement, a small space requirement for the combination of printing unit and drying module is ensured in one circumferential direction, so that several printing units and associated drying modules can be arranged next to each other in small angular spacing on the holding device in relation to the machine frame.
  • the workpiece carriers determine a workpiece plane aligned normal to the axis of rotation of the workpiece rotary table and that the printing unit interface, the inking unit, the printhead interface, the carrier interface and the printhead module are arranged in the vertical direction above the workpiece plane.
  • At least one ink reservoir and a cleaning module, in particular combined with a drying module, are arranged in a section arranged in the vertical direction below the workpiece plane.
  • the pressure direction is aligned parallel to the, in particular perpendicular, axis of rotation.
  • the printing unit for use in a rotary table digital printing machine.
  • the printing unit comprises a carrier frame which is designed to hold an inking unit and a printhead module and which has a printing unit interface which is designed for coupling to a printing unit receptacle of a rotary table digital printing machine and which has a printhead interface which is designed for coupling to a printhead module is designed, and a printhead module which is designed for a delivery of printing ink droplets in a printing direction on a print object and which comprises a printhead carrier and at least one printhead fixed on the printhead carrier, as well as an inking unit that is designed to provide a printing ink to the printhead module and which comprises a paint line for a printing ink supply as well as a delivery line for a printing ink delivery, wherein the paint line and the delivery line are connected to a valve device which is used for influencing a volume flow of printing ink in the delivery line is formed, wherein the printhead carrier comprises a
  • Rotary table digital printing machine shown purely schematically, comprises a workpiece rotary table 3 rotatably mounted on a rotary axis 2 on a machine frame (not shown) and several workpiece carriers 4, each mounted in pairs on the workpiece rotary table.
  • the workpiece carriers 4 are individually rotatably mounted around rotational axes 5 with drive means (not shown) for receiving sleeve-shaped, in particular designed as aerosol can blanks or tube blanks, at least essentially cylindrical workpieces 6.
  • the workpiece carriers 4 are preferably designed as mandrels onto which the workpieces 6, designed as hollow bodies, in particular as hollow cylinders closed on one side, can be slipped.
  • the work station 8 is a loading station at which the cylindrical workpieces 6 are pushed onto the workpiece carriers 4 in pairs by a suitable transport device 19, which is coupled to a conveyor system for the cylindrical workpieces 6, not shown.
  • a rotary position of the cylindrical workpieces 6 is determined at the workstation 9 by a first optical scan of the cylindrical workpieces 6, for example to ensure a correct rotational alignment of the cylindrical workpieces 6 for a printing process taking place at the workstation 10.
  • This is particularly important if the surface of the work piece to be printed is provided with features that match the print image to be applied in a predetermined manner should. These features can be, for example, local indentations and / or impressions (embossing) in and / or from the surface of the workpiece 6 and / or pre-printed areas, which in turn are intended to serve as a primer for the subsequent printing.
  • provision can be made to print a partially reshaped or already completely reshaped workpiece, which in particular has embossments and / or embossments, so that the printed image is aligned with the deformed areas and not, as was previously known from practice, a Deformation of the workpieces is made on the basis of a previously applied print image.
  • Provision is preferably made for a reshaped aerosol can blank to be printed locally or over its entire circumferential surface with embossments and / or embossments, wherein the aerosol can blank can be coated with a protective coating, in particular a transparent coating, in the printed areas after printing and is then ready for filling .
  • the workstation 10 includes an example in the Figures 2 and 3 Printing unit 21 shown in more detail, with which the cylindrical workpieces 6 during a rotational movement about respective axes of rotation 5 using print heads 22, 23 and 24, as shown in FIG Figure 4 are shown in more detail, are printed in a predetermined area.
  • the work station 14 is designed as an inspection device and enables a print quality of the print image applied by the printing unit 21 to the peripheral surface of the workpiece 6 to be determined.
  • the further work stations 11 to 13 and 15 to 17 are used for further processing of the cylindrical workpieces 6, for example for applying a protective varnish to the printing or for mounting components on the workpieces 6.
  • the workpiece rotary table 4 executes a rotary step movement by the angle W for the step-by-step machining of the cylindrical workpieces 6 at the respective work stations 8 to 18, in which the workpiece carriers 4 arranged in pairs from a position opposite the respective work station 8 to 18 into one of the respective subsequent work stations 8 to 18 opposite position can be transported.
  • the rotary step movement takes place as a sequence of acceleration from standstill to a target speed, deceleration from the target speed reached to standstill and a subsequent standstill time.
  • a drive, not shown in detail, for the workpiece rotary table 3 is preferably designed in such a way that the acceleration and deceleration of the workpiece rotary table 3 can be freely adjusted over a wide range and the downtime is completely freely adjustable and adapted to the requirements for machining the respective cylindrical workpieces 6 at the workstations 8 to 18 can be.
  • the drive of the workpiece rotary table 3 can be controlled in such a way that the workpiece carriers 4 in an intermediate step, which can be used for cleaning or other maintenance of work stations 8 to 18, to perform a rotary step movement with the increment W / 2 between the work stations 8 to 18 Come rest as shown schematically in the Figure 1a shown is. This is important, for example, for cleaning the print heads 22, 23, 24.
  • the printing unit 21 comprises two groups of print heads 22, 23, 24 each, each of which has a strip-like shape and on whose end 25, 26 facing the cylindrical workpiece 6, a row of nozzles (not shown) is formed along a central axis 27.
  • Each of the rows of nozzles comprises a plurality of color metering elements, which are arranged at the same pitch or at a distance and are exemplarily designed as nozzles.
  • Each of the ink metering elements can, for example, be individually controlled electrically and, in the embodiment shown, is designed to deliver defined drops of printing ink.
  • the machine frame 30 comprises a machine bed 31 intended to rest on the ground, on which a stator 32 of a rotary direct drive designed to provide the rotary movement for the workpiece rotary table 3, which can be designed as a torque motor, for example, is arranged. Accordingly, the workpiece rotary table 3 forms the rotor of the rotary direct drive.
  • a support tube 33 arranged coaxially to the axis of rotation 2, extends upwards in the vertical direction, starting from the stator 32 and penetrates a recess (not shown) in the ring-shaped workpiece rotary table 3 .
  • a support plate 34 which is embodied in the shape of a circular disk, is arranged, at which work stations 8 to 18 are fixed above the respective workpiece carriers 4 can.
  • a support plate 34 which is embodied in the shape of a circular disk, is arranged, at which work stations 8 to 18 are fixed above the respective workpiece carriers 4 can.
  • only two printing units 21 are arranged on the carrier plate 34, one of the printing units 21 being shown in the front view due to its arrangement on the carrier plate 34, while the other of the printing units 21 is shown in the side view due to its arrangement on the carrier plate 34 is.
  • Each of the printing units 21 is designed to provide ink droplets in a printing direction 28, so that the ink droplets impinge on the surface of the respective workpiece 6 at least almost in a perpendicular direction.
  • the printing unit 21 comprises, purely by way of example, two laterally arranged frame parts 35, 36 which, together with a plate-shaped printing unit interface 37, form the support frame 38 of the printing unit 21 and define a U-shaped profile.
  • the printing unit interface 37 is connected on an upper side 39 to a printing unit receptacle 40 described in more detail below.
  • an inking unit 43 is arranged, which is described below in connection with the Figure 3 is described in more detail.
  • a printhead interface 44 is arranged, which is essentially composed of a connecting plate 45, a linear drive 46 embodied as an electric spindle drive, and a movable drive, not shown in detail, in the end area of the frame parts 35, 36 lying at the bottom in the vertical direction Slide of the linear drive 46 fixed coupling plate 47 is formed. With the linear drive 46, a linear adjustment of the coupling plate 47 can be carried out transversely (in the perpendicular direction) to the axis of rotation 2 in the radial direction in relation to the workpiece rotary table 3.
  • a printhead module 49 is attached to an underside 48 of the coupling plate 47, which is flat as an example and which, as shown in FIG Figure 4 essentially comprises a plate-shaped printhead carrier 50 and the printheads 22, 23 and 24 fixed on the printhead carrier 50.
  • the print head carrier 50 is flat on an upper side 51 facing the coupling plate 47 so that the upper side 51 can be brought into flat contact with the lower side 48 and thus forms a carrier interface.
  • two centering pins 52, 53 positioned exactly to one another are attached purely by way of example to the upper side 51, which protrude in the direction of the coupling plate 47 over the upper side 51 and also exactly to one another positioned, not shown fitting bores can engage in the coupling plate 47 and can thus be viewed as components of the carrier interface.
  • a high-precision measuring device such as a measuring table
  • an electrical linear actuator 55 is assigned to each of the print heads 24.
  • the print head module 49 and the more maintenance-intensive print heads 22, 23, 24 attached to the print head carrier 50 can be accessed in a simple manner.
  • the centering means designed purely by way of example as centering pins 52, 53, and the mutually corresponding surfaces (underside 48 and top 51) ensure simple replacement of the print head carrier 50, the position of the print head carrier 50 being precisely reproducible. Furthermore, the print head carrier 50 with the print heads 22, 23 and 24 attached to it only has a relatively small volume, so that replacement and replacement parts can be shipped is possible by post and thus problems that have occurred on the print heads 22, 23 and 24 can be solved worldwide in a short time.
  • the setting options for the printing unit mount 40 relative to the carrier plate 34 are shown.
  • the printing unit receptacle 40 is coupled to a holding plate 42, which in turn is connected to the carrier plate 34 serving as a holding device, via setting means (not shown in more detail) and surrounded by an elastic bellows 41.
  • the setting means arranged between the printing unit receptacle 40 and the holding plate 42 enable the relative spatial position of the printing unit receptacle 40 to be set with respect to the holding plate 42, these setting means being formed in particular from the group: manually adjustable adjusting spindle, electric linear drive, electric rotary drive and precise alignment the printing unit receptacle 40 and the printing unit 21 received thereon with respect to the workpiece carriers 4.
  • the setting means enable a linear displacement in three spatial directions aligned perpendicular to one another, as indicated by the arrows aligned in the vertical and horizontal directions and the symbolic arrowheads and arrow ends.
  • the setting means not shown in detail, enable pivoting movements about three axes aligned perpendicular to one another, as symbolized by the curved double arrows.
  • the mechanical interfaces of the components of the printing unit 21 and the peripheral components are purely exemplary determine a plurality of interface planes 80 to 84 which are aligned parallel to one another and are arranged along the row arrangement and which are, for example, oriented parallel to the workpiece plane 61 determined by the workpiece carriers 4.
  • the lower side of the paint preparation module 56 defines the uppermost interface level 80 in the vertical direction, which is equivalent to an upper side of the carrier plate 34 (not shown in FIG. 3).
  • the interface level 81 which is synonymous with an underside of the in Figure 3
  • the carrier plate 34 not shown, serves to fix the holding plate 42 of the printing unit receptacle 40 in a fixed position.
  • the interface level 82 denotes the parting plane between the printing unit receptacle 40 and the printing unit 21.
  • the interface level 83 is determined by the connection between the printhead interface 44 and the printhead module 49. Below the workpiece level 61, the top of the drying module 57 forms a further interface level 84, which, however, unlike the other interface levels 80 to 83, does not describe a mechanical connection to other components, but only an exit level for the electromagnetic waves, in particular UV rays, provided by the drying module 57 .
  • the ink preparation module 56 comprises a pump 59, which is designed to convey printing ink from an ink reservoir 60, which is arranged purely by way of example in the vertical direction below a workpiece plane 61 determined by the workpiece carriers 4 and oriented normal to the axis of rotation 2.
  • the printing ink conveyed by the pump 59 is first temporarily stored in a calming container 62 and from there with a further pump 63 into an ink line 75 promoted.
  • a series connection of a degassing device 65, a spring device 66 and a temperature control device 67 is provided in the paint line 75, with which the printing ink is conditioned for use in the printing unit 21.
  • the paint line 75 is connected to a valve device 68 arranged in the inking unit 43, which is designed, for example, as a proportional valve and which is electrically coupled to a control device 69 which is also associated with the inking unit 43.
  • the control device 69 is designed to control the valve device 68 in such a way that the correct color allocation to the print head module 49 always takes place via a supply line 70, also known as a delivery line, which branches in the print head module 49 to each of the print heads 22, 23 and 24 with printing ink to be able to supply.
  • the supply line 70 is shown in detail in FIG Figure 4 shown from the Figure 4 it can also be seen that the print heads 22, 23 and 24 are each connected to the control device 69 via a common control line 71, without this being shown in the illustration of FIG Figure 3 is shown in more detail.
  • the control device 69 is also provided for controlling the linear drive 46, wherein the linear movement provided by the linear drive 46 and aligned in the radial direction can be superimposed with a rotational movement of the workpiece carriers 4 and the workpieces 6 received thereon in order to create spiral-shaped pressure paths on the workpieces 6 for the from the print heads 22, 23 and 24 to generate ink droplets emitted.
  • a control line 72 is formed between the control device 69 and the linear drive 46, with which a control of the linear actuator 55 for a relative movement of the print heads 23, 24 with respect to the print heads 22 is made possible.
  • a drying module 57 is arranged for each of the workpiece carriers 4, which is combined purely by way of example with a cleaning module 73, the drying module 57 and the cleaning module 73 being arranged on the machine bed 31 so as to be linearly movable with the aid of an actuator 74, which is only shown symbolically Height adjustment for the cleaning module 73 can be made in order to be able to arrange it directly opposite the print heads 22, 23, 24.
  • the drying module 57 comprises, for example, a strip-shaped arrangement of lighting means (not shown in detail), in particular light-emitting diodes, which are designed to provide ultraviolet radiation, the lighting means extending along an axis of rotation of the respective workpiece carrier 4.
  • the light beams provided by the illuminants can cover the entire outer surface of the workpiece when the workpiece rotates about the axis of rotation and thus, for example, achieve curing of printing ink that was applied with the printing unit.
  • the respective drying module 57 can be arranged in the vertical direction below the respective workpiece carrier 4 for carrying out the drying or curing process. It is provided that the respective drying module 57 in the Figure 3 position shown relative to the workpiece carrier 4 assumes.
  • the drying module 57 and the cleaning module 73 form an assembly which together with the aid of the actuator 74 from the in Figure 3 shown drying position can be brought into a cleaning position, not shown.
  • the workpiece rotary table performs a movement with the increment W / 2, so that the workpiece carriers 4 are not arranged opposite to the print heads 22, 23, 24.
  • the cleaning module can then be arranged directly opposite the print head module by a combined horizontal and vertical movement of the actuator 74 and a cleaning process for the print heads 22, 23, 24 can be started.
  • the cleaning module 73 is equipped with an absorption material, not shown in detail, which can absorb a large amount of dye, in particular ink, which are output by the print heads 22, 23, 24 while a cleaning cycle is being carried out.
  • an absorption material not shown in detail, which can absorb a large amount of dye, in particular ink, which are output by the print heads 22, 23, 24 while a cleaning cycle is being carried out.
  • all of the nozzles of the print heads 22, 23, 24 are preferably activated for the delivery of ink and thereby made running again if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ink Jet (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Machine Tool Units (AREA)
  • Screen Printers (AREA)
EP17196877.9A 2017-10-17 2017-10-17 Rundtisch-digitaldruckmaschine und druckwerk Active EP3473446B1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP17196877.9A EP3473446B1 (de) 2017-10-17 2017-10-17 Rundtisch-digitaldruckmaschine und druckwerk
ES17196877T ES2823252T3 (es) 2017-10-17 2017-10-17 Impresora digital de mesa circular y mecanismo de impresión
US16/149,705 US10696068B2 (en) 2017-10-17 2018-10-02 Rotary table digital printing machine and printing unit
CA3020116A CA3020116A1 (en) 2017-10-17 2018-10-09 Rotary table digital printing machine and printing unit
TW107136307A TWI775967B (zh) 2017-10-17 2018-10-16 轉台數位印刷機及印刷單元
JP2018195840A JP7231189B2 (ja) 2017-10-17 2018-10-17 回転テーブルデジタル印刷機及び印刷ユニット
IL262436A IL262436B (he) 2017-10-17 2018-10-17 מכונת הדפסה דיגיטלית שולחנית סיבובית ויחידת הדפסה
CN201811208564.9A CN109664613B (zh) 2017-10-17 2018-10-17 旋转台数字打印机和打印单元

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17196877.9A EP3473446B1 (de) 2017-10-17 2017-10-17 Rundtisch-digitaldruckmaschine und druckwerk

Publications (2)

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EP3473446A1 EP3473446A1 (de) 2019-04-24
EP3473446B1 true EP3473446B1 (de) 2020-08-26

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Country Status (8)

Country Link
US (1) US10696068B2 (he)
EP (1) EP3473446B1 (he)
JP (1) JP7231189B2 (he)
CN (1) CN109664613B (he)
CA (1) CA3020116A1 (he)
ES (1) ES2823252T3 (he)
IL (1) IL262436B (he)
TW (1) TWI775967B (he)

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DE102022100700A1 (de) 2022-01-13 2023-07-13 Kolbus Gmbh & Co. Kg Druckvorrichtung zum individuellen Bedrucken von bahnförmigen oder bogenförmigen Bedruckstoffen

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Also Published As

Publication number Publication date
ES2823252T3 (es) 2021-05-06
EP3473446A1 (de) 2019-04-24
JP7231189B2 (ja) 2023-03-01
CN109664613A (zh) 2019-04-23
CN109664613B (zh) 2022-07-22
IL262436A (he) 2019-03-31
CA3020116A1 (en) 2019-04-17
JP2019093704A (ja) 2019-06-20
US10696068B2 (en) 2020-06-30
TWI775967B (zh) 2022-09-01
US20190111709A1 (en) 2019-04-18
IL262436B (he) 2022-04-01
TW201922519A (zh) 2019-06-16

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