EP3473446B1 - Roundtable digital printing machine and printing unit - Google Patents
Roundtable digital printing machine and printing unit Download PDFInfo
- 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
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- 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.)
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Images
Classifications
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- 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)
Description
Die Erfindung betrifft eine Rundtisch-Digitaldruckmaschine zur Bedruckung von Werkstücken in einem Tintenstrahl-Digitaldruckverfahren. Ferner betrifft die Erfindung ein Druckwerk zur Verwendung in einer derartigen Rundtisch-Digitaldruckmaschine.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.
Aus der
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Die Aufgabe der Erfindung besteht darin, eine Rundtisch-Digitaldruckmaschine sowie ein Druckwerk bereitzustellen, die eine verbesserte Reproduzierbarkeit eines Druckergebnisses gewährleisten.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.
Diese Aufgabe wird für eine Rundtisch-Digitaldruckmaschine eingangs genannten Art mit den Merkmalen des Anspruchs 1 gelöst. Hierbei umfasst die Rundtisch-Digitaldruckmaschine ein Maschinengestell, an dem ein Werkstückrundtisch drehbar um eine Drehachse gelagert ist, der mit mehreren in gleicher Winkelteilung und mit gleichem Abstand zur Drehachse angeordneten Werkstückträgern versehen ist und dem eine Antriebseinrichtung für eine Bereitstellung einer Drehschrittbewegung zugeordnet ist, wobei das Maschinengestell wenigstens eine Halteeinrichtung umfasst, die zur Aufnahme von Arbeitsstationen ausgebildet ist, die zur Bearbeitung von Werkstücken eingerichtet sind, sowie wenigstens einem an der Halteeinrichtung angebrachten Arbeitsstation, das als Druckwerk zur Bedruckung von Werkstücken ausgebildet ist, wobei das Druckwerk einen Trägerrahmen umfasst, der zur Aufnahme eines Farbwerks und eines Druckkopfmoduls ausgebildet ist und der eine Druckwerkschnittstelle aufweist, die für eine Kopplung mit einer der Halteeinrichtung zugehörigen Druckwerkaufnahme ausgebildet ist, wobei der Trägerrahmen eine Druckkopfschnittstelle aufweist, die für eine Kopplung mit einem Druckkopfmodul ausgebildet ist, mit einem Druckkopfmodul, das für eine Abgabe von Druckfarbentröpfchen in einer Druckrichtung auf ein Werkstück ausgebildet ist und das einen Druckkopfträger sowie wenigstens einen am Druckkopfträger festgelegten Druckkopf umfasst, sowie mit einem Farbwerk, das für eine Bereitstellung einer Druckfarbe an das Druckkopfmodul ausgebildet ist, wobei der Druckkopfträger eine Trägerschnittstelle umfasst, die für eine Kopplung mit der Druckkopfschnittstelle ausgebildet ist, wobei die Druckwerkaufnahme, die Druckwerkschnittstelle, das Farbwerk, die Druckkopfschnittstelle, die Trägerschnittstelle und das Druckkopfmodul eine längs der Druckrichtung angeordnete Reihenanordnung ausbilden.This object is achieved with the features of
Bei den Werkstücken kann es sich insbesondere um hülsenförmig ausgebildete Körper aus Metall oder Kunststoff handeln, die beispielsweise als Rohlinge für die Herstellung von Aerosoldosen oder Kunststofftuben dienen.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.
Beispielhaft ist die Halteeinrichtung als ringförmige Platte ausgebildet und oberhalb des Werkstückrundtischs angeordnet, wobei eine Mittelachse der Halteeinrichtung vorzugsweise parallel zur Drehachse ausgerichtet ist. Die Halteeinrichtung ist als integraler Bestandteil des Maschinengestells ausgeführt und dient zur Aufnahme von Arbeitsstationen, wobei wenigstens eines dieser Arbeitsstationen als Druckwerk zur Bedruckung von Werkstücken ausgebildet ist. Weitere Arbeitsstationen können dazu ausgebildet sein, die an den Werkstückträgern aufgenommenen und im Zuge einer Drehschrittbewegung von einem Arbeitsstation zum nächsten geförderten Werkstücke für die Durchführung des mit dem wenigstens einen Druckwerk vorgesehenen Druckvorgangs vorzubereiten oder nach der Durchführung des Druckvorgangs weitere Arbeitsschritte am Werkstück durchzuführen. Exemplarisch ist vorgesehen, dass an der Halteeinrichtung mehrere Druckwerke angebracht sind, die beispielsweise für eine Bedruckung des Werkstücks mit unterschiedlichen Farben ausgebildet sind.For example, 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. As an example, it is provided that several printing units are attached to the holding device, which are designed, for example, for printing the workpiece with different colors.
Das Druckwerk umfasst einen Trägerrahmen, an dem eine Druckwerkschnittstelle ausgebildet ist, die für eine Festlegung des Druckwerks an einer Druckwerkaufnahme ausgebildet ist, wobei die Druckwerkaufnahme mit der Halteeinrichtung gekoppelt ist. Vorzugsweise umfasst der Trägerrahmen zwei beabstandet zueinander angeordnete Rahmenteile, die zusammen mit der Druckkopfschnittstelle ein U-förmiges Profil bilden, wobei die Rahmenteile die seitlichen U-Schenkel bilden. Hierbei kann vorgesehen werden, dass das Farbwerk benachbart zur Druckwerkschnittstelle zwischen den beiden Rahmenteilen angeordnet ist, während das Druckkopfmodul auf einer der Druckwerkschnittstelle abgewandten Seite des Farbwerks angeordnet ist.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.
Für eine reproduzierbare Festlegung des Druckkopfmoduls am Trägerrahmen umfasst der Druckkopfträger eine Trägerschnittstelle, die derart an eine Druckkopfschnittstelle des Trägerrahmens angepasst ist, dass bei einer Demontage des Drucckopfmoduls vom Trägerrahmen, wie sie beispielsweise zu Wartungszwecken erforderlich sein kann, sowie einer darauffolgenden Montage des gleichen oder eines anderen Druckkopfmoduls an den Trägerrahmen keine oder nur sehr geringe Einstellarbeiten für die Ausrichtung des Druckkopfmoduls gegenüber den Werkstückträgern und den daran aufgenommenen Werkstücken durchzuführen sind.For a reproducible fixation of the print head module on the carrier frame, 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.
Um die angestrebte Verbesserung der Reproduzierbarkeit des Druckergebnisses zu erreichen, das mit der Rundtisch-Digitaldruckmaschine erzielt werden kann, ist es vorteilhaft, wenn die Druckwerkaufnahme, die Druckwerkschnittstelle, das Farbwerk, die Druckkopfschnittstelle, die Trägerschnittstelle und das Druckkopfmodul eine Reihenanordnung bilden, die längs der Druckrichtung ausgerichtet ist. Durch die Aufreihung der Komponenten wird eine kompakte Anordnung der Komponenten ermöglicht, so dass Maßabweichungen und Toleranzen der mechanisch miteinander gekoppelten Komponenten einen geringeren Einfluss als bei einer räumlich ausladenden Anordnung haben. Ferner wird durch die Reihenanordnung der mechanischen Schnittstellen der Komponenten auch eine zumindest weitgehend symmetrische Kraftübertragung zwischen den Komponenten gewährleistet, was ebenfalls eine präzise Ausrichtung des wenigstens einen Druckkopfs gegenüber der Halteeinrichtung und den Werkstückträgern ermöglicht.In order to achieve the desired improvement in the reproducibility of the printing result, which can be achieved with the rotary table digital printing machine, it is advantageous if 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. By lining up the components, 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. Furthermore, 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.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angeführt angegeben.Advantageous further developments of the invention are given in the subclaims.
Zweckmäßig ist es, wenn die Trägerschnittstelle und die Druckkopfschnittstelle zwei Zentriermittelpaare umfassen, die für eine reproduzierbare Positionierung des Druckkopfträgers am Trägerrahmen ausgebildet sind. Beispielhaft umfasst ein Zentriermittelpaar eine hochpräzise Steckverbindung, die insbesondere von einem Passstift und einer korrespondierenden, als Passung ausgebildeten Ausnehmung gebildet wird, wobei der Passstift einer der Schnittstellen zugeordnet ist und die Ausnehmung der jeweils anderen Schnittstelle zugeordnet ist. Da zwei Zentriermittelpaare vorgesehen sind, ist es zudem auch notwendig, dass die der jeweiligen Schnittstelle zugeordneten Zentriermittel hochpräzise zueinander angeordnet sind und die Anordnung exakt mit der Anordnung der Zentriermittel an der anderen Schnittstelle übereinstimmt, da nur in diesem Fall eine Kopplung der beiden Zentriermittelpaare möglich ist. Sofern diese Randbedingungen eingehalten werden, ist bei einer Demontage des Druckkopfträgers vom Trägerrahmen und einer nachfolgenden Montage des Druckkopfträgers an den Trägerrahmen davon auszugehen, dass das Druckkopfmodul nach der Montage wieder die gleiche Position gegenüber der Halteeinrichtung und den Werkstückträgern einnimmt, die es auch vor der Demontage innehatte.It is expedient if 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. By way of example, 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 . Provided that these boundary conditions are met, it can be assumed when dismantling the printhead carrier from the carrier frame and subsequently assembling the printhead carrier on the carrier frame that the printhead module will again assume the same position in relation to the holding device and the workpiece carriers that it was before disassembly held.
Bevorzugt ist vorgesehen, dass der wenigstens eine Druckkopf in vorgebbarer Anordnung gegenüber den wenigstens zwei am Druckkopfträger ausgebildeten Zentriermitteln angeordnet ist. Hierdurch wird gewährleistet, dass bei einem Austausch eines ersten Druckkopfmoduls gegen ein zweites Druckkopfmodul der wenigstens eine am zweiten Druckkopfmodul angeordnete Drucckopf genau die gleiche Position gegenüber der Halteeinrichtung und den Werkstückträgern einnimmt wie der wenigstens eine Druckkopf des ersten Druckkopfmoduls. Exemplarisch ist vorgesehen, dass die Zentriermittel als Referenz für die Montage des jeweiligen Druckkopfs an den Druckkopfträger eingesetzt werden und dass der jeweilige Druckkopf vor einer endgültigen Festlegung am Druckkopfträger solange verlagert werden kann, bis er eine vorgegebene Position gegenüber den Zentriermitteln einnimmt.It is preferably provided that 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. As an example, it is provided that 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.
Bei einer vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, dass die Trägerschnittstelle und/oder die Druckkopfschnittstelle eine normal zur Druckrichtung ausgerichtete Planfläche umfassen, wobei an der Planfläche wenigstens zwei Zentriermittel angeordnet sind. Hierbei dient die Planfläche ergänzend zu der Zentrierungswirkung durch die Zentriermittel zur Ausrichtung des Druckkopfträgers gegenüber dem Trägerrahmen und unterstützt somit die präzise Montage des Druckkopfmoduls am Trägerrahmen.In an advantageous embodiment of the invention it is provided that 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. In addition to the centering effect by the centering means, 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.
In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass die Druckkopfschnittstelle mit einem, insbesondere genau einem, Freiheitsgrad der Bewegung beweglich am Trägerrahmen angebracht ist und dass eine Stelleinrichtung für eine Einleitung einer, insbesondere linearen, Stellbewegung zwischen Trägerrahmen und Trägerschnittstelle vorgesehen ist. Hierdurch wird eine Relativbewegung der Druckkopfschnittstelle mit den daran festgelegten Druckkopfmodul gegenüber dem Trägerrahmen ermöglicht, um beispielsweise eine Anpassung einer räumlichen Position des wenigstens einen Druckkopfs gegenüber den Werkstückträgern zu ermöglichen. Bevorzugt ist vorgesehen, dass die Stelleinrichtung zur Bereitstellung einer Linearbewegung ausgebildet ist, wobei eine Bewegungsachse dieser Linearbewegung in radialer Richtung und somit quer (im rechten Winkel) zur Drehachse des Werkstückrundtischs verläuft. Mit einer derart ausgebildet Einstelleinrichtung kann eine lineare Verlagerung des Druckkopfmoduls der der Durchführung eines Druckvorgangs vorgesehen werden. Dies ist insbesondere dann von Interesse, wenn die Werkstückträger derart ausgerichtet sind, dass Mittelachsen der Werkstücke quer (im rechten Winkel) zur Drehachse des Werkstückrundtischs ausgerichtet sind und wenn die Werkstücke während der Durchführung des Druckvorgangs eine Rotationsbewegung um ihre Mittelachse durchführen. In diesem Fall ergibt sich aufgrund der Überlagerung der Linearbewegung des Druckkopfmoduls und die Rotationsbewegung des Werkstücks ein spiralförmiges Druckbild auf der Außenoberfläche des Werkstücks.In a further embodiment of the invention it is provided that 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. 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. It is preferably provided that 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. With an adjusting device designed in this way, 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. In this case, due to the superposition of the linear movement of the print head module and the rotational movement of the workpiece, a spiral print image is produced on the outer surface of the workpiece.
Vorteilhaft ist es, wenn das Farbwerk eine Steuereinrichtung, eine Farbleitung für eine Druckfarbenzufuhr sowie eine Abgabeleitung für eine Druckfarbenabgabe an das Druckkopfmodul umfasst, wobei die Farbleitung und die Abgabeleitung mit einer Ventileinrichtung verbunden sind, die für eine Beeinflussung eines Druckfarbenvolumenstroms in der Abgabeleitung ausgebildet ist, und wobei die Steuereinrichtung für eine Ansteuerung der Ventileinrichtung und/oder des wenigstens einen Druckkopfs ausgebildet ist. Die Hauptaufgabe des Farbwerks besteht somit darin, die über die Farbleitung geförderte Druckfarbe in geeigneter Menge an das Druckkopfmodul bereitzustellen. Hierzu umfasst das Farbwerk die Ventileinrichtung, die vorzugsweise als Proportionalventil ausgebildet ist und in Abhängigkeit von einem Steuersignal der Steuereinrichtung den gewünschten Druckfarbenvolumenstrom an das Druckkopfmodul bereitgestellt. Ergänzend oder alternativ kann die Steuereinrichtung für eine Ansteuerung des Druckkopfs vorgesehen sein, bei dem es sich insbesondere um einen Tintenstrahldruckkopf auf Basis von Piezotechnik handelt.It is advantageous if 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. For this purpose, 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. In addition or as an alternative, the control device can be provided for controlling the print head, which is in particular an inkjet print head based on piezo technology.
Zweckmäßig ist es, wenn das Druckkopfmodul wenigstens zwei Druckköpfe umfasst, die jeweils mehrere längs einer Radialrichtung in gleicher Teilung angeordnete Druckdüsen aufweisen, die jeweils eine Düsenreihe bilden, wobei die Düsenreihen der Druckköpfe parallel zueinander angeordnet sind und wobei wenigstens einem der Druckköpfe eine Positioniereinrichtung für eine lineare Verstellung des jeweiligen Drucckopfs in der Radialrichtung relativ zum Druckkopfträger zugeordnet ist, wobei die Steuereinrichtung für eine Ansteuerung der Druckköpfe und der Positioniereinrichtung ausgebildet ist. Mit der linearen Verstellung des wenigstens einen Drucckopfs kann eine Anpassung des Druckkopfmoduls an unterschiedliche Werkstückdurchmesser vorgenommen werden. Zur Erzielung einer vorgegebenen Dichte von Druckpunkten auf der Oberfläche des Werkstücks, die von den jeweiligen Druckdüsen der Druccköpfe bereitgestellt werden, ist in Abhängigkeit vom Werkstückdurchmesser eine Steigungseinstellung für das spiralförmige Druckbild erforderlich, die mit Hilfe der Positioniereinrichtung vorgenommen werden kann. Die Steuereinrichtung die hierbei zum einen zur Ansteuerung der Positioniereinrichtung, bei der es sich insbesondere um einen piezoelektrischen Steller handeln kann, und zum anderen zur Ansteuerung der Druckköpfe, wobei in Abhängigkeit von der relativen Stellung der Druckköpfe zueinander eventuell einzelne Düsen der Druccköpfe für den jeweiligen Druckvorgang zeitweilig vollständig deaktiviert werden können, um unerwünschte Überlappungen von Druckpunkten im Druckbild zu vermeiden.It is useful if 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. With the linear adjustment of the at least one print head, the print head module can be adapted to different workpiece diameters. To achieve a predetermined density of pressure points on the surface of the workpiece, which are provided by the respective pressure nozzles of the print heads, a pitch setting for the spiral print image is required depending on the workpiece diameter, which can be made with the help of the positioning device. 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.
In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass zwischen einer an der Halteeinrichtung ausgebildeten Druckwerkaufnahme und der Halteeinrichtung wenigstens eine Einstelleinrichtung für eine Beeinflussung einer räumlichen Ausrichtung der Druckwerkschnittstelle gegenüber der Halteeinrichtung angeordnet ist. Beispielhaft kann mit der Einstelleinrichtung Einfluss auf eine Parallelität zwischen den Düsenreihen der Druckköpfe und den Mittelachsen der Werkstücke bzw. der als Spindeln ausgeführten Werkstückträger genommen werden. Ergänzend oder alternativ kann die Einstelleinrichtung zur Justierung einer radialen Position der Druckköpfe, also eines Abstands zur Drehachse, genutzt werden. Darüber hinaus ist ergänzend oder alternativ auch eine Einstellung eines Achsversatzes zwischen den Düsenreihen der Druckköpfe und den Mittelachsen der Werkstücke mit der Einstelleinrichtung vorgesehen. Zudem kann die Einstelleinrichtung ergänzend oder alternativ auch für eine Winkeleinstellung zwischen den Düsenreihen der Druckköpfe und den Mittelachsen der Werkstücke ausgebildet sein.In a further embodiment of the invention it is provided that 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. For example, 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. Additionally or alternatively, 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. In addition or as an alternative, 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. In addition or as an alternative, 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.
Bevorzugt ist vorgesehen, dass ein benachbart zur Druckwerkschnittstelle angeordnetes Farbaufbereitungsmodul an einem dem Druckkopfmodul entgegengesetzten Endbereich der Reihenanordnung angeordnet ist und mit einer Farbleitung verbunden ist, die für eine Druckfarbenzufuhr zum Farbwerk ausgebildet ist. Dabei kommt dem Farbaufbereitungsmodul die Aufgabe zu, die aus einem Farbspeicher geförderte Druckfarbe für die Verwendung im Druckwerk aufzubereiten. Aufgrund der vorgesehenen Anordnung des Farbaufbereitungsmoduls an einem Endbereich der Reihenanordnung, der dem Druckkopfmodul entgegengesetzt ist, lässt sich ein vorteilhafter Förderweg für die Druckfarbe erzielen, da die Druckfarbe ausgehend vom Farbaufbereitungsmodul in das längs der Reihenanordnung benachbarte Farbmodul gefördert wird und von dort aus weiterhin längs der Reihenanordnung bis zum Druckkopfmodul strömen kann, um dort den Druckköpfen zugeführt zu werden.It is preferably provided that 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.
Bei einer vorteilhaften Weiterbildung der Erfindung ist vorgesehen, dass das Farbaufbereitungsmodul eine Pumpeinrichtung für eine Förderung von Druckfarbe und/oder einen Druckfarbenspeicher für eine Zwischenspeicherung von Druckfarbe und/oder eine Temperiereinrichtung für eine Temperierung der Druckfarbe und/oder eine Entgasungseinrichtung für eine Entgasung der Druckfarbe und/oder eine Filtereinrichtung für eine Filterung der Druckfarbe umfasst. Vorzugsweise umfasst das Farbaufbereitungsmodul zumindest eine Temperiereinrichtung für die Temperierung der Druckfarbe, eine Entgasungseinrichtung, die zur Abscheidung von Gasblasen aus der Druckfarbe ausgebildet ist, sowie eine Federeinrichtung, um die Druckfarbe vor dem Weitertransport zum Farbwerk von eventuell noch vorhandenen Partikeln, die die Druckdüsen verstopfen könnten, zu befreien. Ergänzend können eine Pumpeinrichtung und/oder ein Druckfarbenspeicher vorgesehen sein, wobei die Pumpeinrichtung zur Förderung der Druckfarbe aus einem Farbspeicher ausgebildet ist und der Druckfarbenspeicher für eine Pufferung und Beruhigung von geförderter Druckfarbe dient, bevor diese der Temperierung und Entgasung und Filterung zugeführt wird.In an advantageous development of the invention, it is provided that 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. In addition, 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.
Vorteilhaft ist es, wenn gegenüberliegend zum Druckkopfmodul ein in die Reihenanordnung eingereihtes, am Maschinengestell angebrachtes Trocknungsmodul angeordnet ist, das mit dem Druckkopfmodul in der Druckrichtung einen Werkstückspalt begrenzt und das für eine Bereitstellung von Trocknungsenergie an ein im Werkstückspalt angeordnetes Werkstück ausgebildet ist. Beispielhaft ist das Trocknungsmodul für die Bereitstellung von Wärmeenergie oder von Energie in Form von elektromagnetischer Strahlung, insbesondere ultravioletter Strahlung, ausgebildet, um eine rasche und effiziente Aushärtung der Druckfarbe auf der Oberfläche des Werkstücks zu gewährleisten. Aufgrund der Anordnung des Trocknungsmoduls in der Reihenanordnung wird ein geringer Bauraumbedarf für die Kombination von Druckwerk und Trocknungsmodul in einer Umfangsrichtung gewährleistet, so dass mehrere Druckwerke und zugeordnete Trocknungsmodule in kleiner Winkelteilung nebeneinander an der Halteeinrichtung Beziehung weise dem Maschinengestell angeordnet werden können.It is advantageous if, opposite to the print head module, 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. For example, 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.
Bevorzugt ist vorgesehen, dass die Werkstückträger eine normal zur Drehachse des Werkstückrundtischs ausgerichtete Werkstückebene bestimmen und dass die Druckwerkschnittstelle, das Farbwerk, die Druckkopfschnittstelle, die Trägerschnittstelle und das Druckkopfmodul in vertikaler Richtung oberhalb der Werkstückebene angeordnet sind. Hierdurch wird die gewünschte kompakte Anordnung des Druckwerks in der Rundtisch-Digitaldruckmaschine ermöglicht, da in dem Bereich oberhalb der Werkstückebene keine Rücksicht auf räumliche Anforderungen genommen werden muss, die beispielsweise durch den Werkstückrundtisch und die Antriebseinrichtung für den Werkstückrundtisch bestimmt werden.It is preferably provided that 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. This enables the desired compact arrangement of the printing unit in the rotary table digital printing machine, since in the area above the workpiece level no consideration has to be given to spatial requirements that are determined, for example, by the workpiece rotary table and the drive device for the workpiece rotary table.
Zweckmäßig ist es, wenn in einem in vertikaler Richtung unterhalb der Werkstückebene angeordneten Abschnitt wenigstens ein Farbspeicher und ein, insbesondere mit einem Trocknungsmodul kombiniertes, Reinigungsmodul angeordnet sind.It is expedient if 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.
In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass die Druckrichtung parallel zur, insbesondere lotrechten, Drehachse ausgerichtet ist.In a further embodiment of the invention it is provided that the pressure direction is aligned parallel to the, in particular perpendicular, axis of rotation.
Die Aufgabe der Erfindung wird auch durch ein Druckwerk zur Verwendung in einer Rundtisch-Digitaldruckmaschine gelöst. Hierzu umfasst das Druckwerk einen Trägerrahmen, der zur Aufnahme eines Farbwerks und eines Druckkopfmoduls ausgebildet ist und der eine Druckwerkschnittstelle aufweist, die für eine Kopplung mit einer Druckwerkaufnahme einer Rundtisch-Digitaldruckmaschine ausgebildet ist, und der eine Druckkopfschnittstelle aufweist, die für eine Kopplung mit einem Druckkopfmodul ausgebildet ist, sowie ein Druckkopfmodul, das für eine Abgabe von Druckfarbentröpfchen in einer Druckrichtung auf ein Druckobjekt ausgebildet ist und das einen Drucckopfträger sowie wenigstens einen am Druckkopfträger festgelegten Druckkopf umfasst, sowie ein Farbwerk, das für eine Bereitstellung einer Druckfarbe an das Druckkopfmodul ausgebildet ist und das eine Farbleitung für eine Druckfarbenzufuhr sowie eine Abgabeleitung für eine Druckfarbenabgabe umfasst, wobei die Farbleitung und die Abgabeleitung mit einer Ventileinrichtung verbunden sind, die für eine Beeinflussung eines Druckfarbenvolumenstroms in der Abgabeleitung ausgebildet ist, wobei der Druckkopfträger eine Trägerschnittstelle umfasst, die für eine Kopplung mit der Druckkopfschnittstelle ausgebildet ist, wobei die Druckwerkschnittstelle, das Farbwerk, die Druckkopfschnittstelle, die Trägerschnittstelle und das Druckkopfmodul in Reihe längs der Druckrichtung angeordnet sind.The object of the invention is also achieved by a printing unit for use in a rotary table digital printing machine. For this purpose, 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 carrier interface which is designed for coupling with the printhead interface, the printing unit interface, the inking unit, the printhead interface, the carrier interface and the printhead module are arranged in series along the printing direction.
Eine vorteilhafte Ausführungsform der Erfindung ist in der Zeichnung dargestellt. Hierbei zeigt:
Vorteilhafte Ausführungen der Erfindung sind in der Zeichnung dargestellt. Hierbei zeigt:
Figur 1- eine schematische Draufsicht auf eine Rundtisch-Digitaldruckmaschine mit einem drehbeweglich gelagerten Werkstückrundtisch und mehreren Arbeitsstationen zur Bedruckung und Inspektion von zylindrischen Werkstücken,
- Figur 1a
- eine Ausschnittvergrößerung der Rundtisch-Digitaldruckmaschine gemäß der
Figur 1 in einer Zwischenstellung für den Werkstückrundtisch, Figur 2- eine schematische Vorderansicht der Rundtisch-Digitaldruckmaschine,
Figur 3- eine schematische Vorderansicht auf ein Druckwerk zur Verwendung in der Rundtisch-Digitaldruckmaschine, und
Figur 4- eine schematische Darstellung einer Draufsicht auf einen mit mehreren Druckköpfen ausgestatteten Druckkopfträger.
Advantageous embodiments of the invention are shown in the drawing. Here shows:
- Figure 1
- a schematic top view of a rotary table digital printing machine with a rotatably mounted workpiece rotary table and several work stations for printing and inspecting cylindrical workpieces,
- Figure 1a
- an enlarged section of the rotary table digital printing machine according to FIG
Figure 1 in an intermediate position for the workpiece rotary table, - Figure 2
- a schematic front view of the rotary table digital printing machine,
- Figure 3
- a schematic front view of a printing unit for use in the rotary table digital printing machine, and
- Figure 4
- a schematic representation of a plan view of a print head carrier equipped with several print heads.
Eine in der
In einem von den Werkstückträger 4 bei einer Drehbewegung des Werkstückrundtischs 3 um die Drehachse 2 überstrichenen ringförmigen Bereich 7, der sich in radialer Richtung um den Werkstückrundtisch 3 erstreckt, sind mehrere Arbeitsstationen 8 bis 18 angeordnet, die zu einer Bearbeitung und/oder Prüfung der transportierten Werkstücke 6 ausgebildet sind. Da es sich bei der Ansicht gemäß der
Die Arbeitsstation 8 ist eine Beladestation, an der die zylindrischen Werkstücke 6 exemplarisch paarweise auf die Werkstückträger 4 durch eine geeignete Transporteinrichtung 19, die mit einem nicht näher dargestellten Fördersystem für die zylindrischen Werkstücke 6 gekoppelt ist, aufgeschoben werden.The
Exemplarisch wird an der Arbeitsstation 9 durch eine erste optische Abtastung der zylindrischen Werkstücke 6 eine rotatorische Position der zylindrischen Werkstücke 6 bestimmt, beispielsweise um eine korrekte rotatorische Ausrichtung der zylindrischen Werkstücke 6 für einen an der Arbeitsstation 10 erfolgenden Druckvorgang zu gewährleisten. Dies ist insbesondere dann von Bedeutung, wenn die zu bedruckende Oberfläche der Werkstücke mit Merkmalen versehen ist, die mit dem aufzubringenden Druckbild in vorgegebener Weise in Passung stehen sollen. Bei diesen Merkmalen kann es sich beispielsweise um lokale Ein- und/oder Ausprägungen (Embossing) in und/oder aus der Oberfläche des Werkstücks 6 und/oder um vorbedruckte Bereiche handeln, die ihrerseits als Grundierung für die nachfolgende Bedruckung dienen sollen. Vorzugsweise kann vorgesehen werden, einen teilweise umgeformten oder bereits vollständig umgeformten Werkstück, das insbesondere Einprägungen und/oder Ausprägungen aufweist, zu bedrucken, so dass eine Ausrichtung des Druckbilds gegenüber den deformierten Bereichen erfolgt und nicht, wie es aus der Praxis bislang bekannt war, eine Deformation der Werkstücke anhand eines vorab aufgebrachten Druckbilds vorgenommen wird. Vorzugsweise ist vorgesehen, einen umgeformten Aerosoldosenrohling mit Einprägungen und/oder Ausprägungen lokal oder über seine gesamte Umfangsoberfläche zu bedrucken, wobei der Aerosoldosenrohling nach der Bedruckung in den bedruckten Bereichen mit einer Schutzlackierung, insbesondere einem Transparentlack, überzogen werden kann und dann für eine Befüllung bereit ist.As an example, a rotary position of the
Die Arbeitsstation 10 umfasst exemplarisch ein in den
Die Arbeitsstation 14 ist exemplarisch als Inspektionseinrichtung ausgebildet und ermöglicht eine Ermittlung einer Druckqualität des von der Druckwerk 21 auf die Umfangsoberfläche des Werkstücks 6 aufgebrachten Druckbilds.The
Die weiteren Arbeitsstationen 11 bis 13 und 15 bis 17 dienen zur weiteren Bearbeitung der zylindrischen Werkstücke 6, beispielsweise zur Aufbringung eines Schutzlacks auf die Bedruckung oder zur Montage von Komponenten an die Werkstücke 6.The
An der Arbeitsstation 18 findet ein Entladevorgang statt, bei dem die zylindrischen Werkstücke 6 mit Hilfe einer Transporteinrichtung 20 von den dornartig ausgebildeten Werkstückträgern 4 abgezogen werden und einem nicht näher dargestellten weiterführenden Transportsystem zugeführt werden.At the
Der Werkstückrundtisch 4 führt zur schrittweisen Bearbeitung der zylindrischen Werkstücken 6 an den jeweiligen Arbeitsstationen 8 bis 18 eine Drehschrittbewegung um den Winkel W aus, bei der die jeweils paarweise angeordneten Werkstückträger 4 aus einer der jeweiligen Arbeitsstation 8 bis 18 gegenüberliegenden Position in eine der jeweils nachfolgenden Arbeitsstation 8 bis 18 gegenüberliegenden Position transportiert werden. Hierbei erfolgt die Drehschrittbewegung als Abfolge einer Beschleunigung aus dem Stillstand bis zu einer Zielgeschwindigkeit, einer Abbremsung aus der erreichten Zielgeschwindigkeit bis zum Stillstand und einer nachfolgenden Stillstandszeit. Vorzugsweise ist ein nicht näher dargestellter Antrieb für den Werkstückrundtisch 3 derart ausgebildet, dass die Beschleunigung und Abbremsung des Werkstückrundtischs 3 in weiten Bereichen und die Stillstandszeit völlig frei einstellbar sind und an die Erfordernisse der Bearbeitung der jeweiligen zylindrischen Werkstücke 6 an den Arbeitsstationen 8 bis 18 angepasst werden können. Ferner kann der Antrieb des Werkstückrundtischs 3 derart angesteuert werden, dass die Werkstückträger 4 in einem Zwischenschritt, der zur Reinigung oder sonstigen Wartung von Arbeitsstationen 8 bis 18 genutzt werden kann, um eine Drehschrittbewegung mit der Schrittweite W/2 zwischen den Arbeitsstationen 8 bis 18 zur Ruhe kommen, wie dies schematisch in der
Das Druckwerk 21 umfasst exemplarisch zwei Gruppen von jeweils Druckköpfen 22, 23, 24, die jeweils eine leistenartige Gestalt aufweisen und an deren dem zylindrischen Werkstück 6 zugewandter Stirnseite 25, 26 exemplarisch längs einer Mittelachse 27 jeweils eine nicht gezeigte Düsenreihe ausgebildet ist. Jede der Düsenreihen umfasst mehrere in gleicher Teilung oder Beabstandung angeordnete, exemplarisch als Düsen ausgebildete Farbdosierelemente. Jedes der Farbdosierelemente ist beispielhaft einzeln elektrisch ansteuerbar und bei der dargestellten Ausführungsform zur Abgabe von definierten Druckfarbentropfen ausgebildet.The
Wie aus der rein schematischen Vorderansicht der
Die nachstehenden Erläuterungen betreffen jeweils beide in der
Das Druckwerk 21 umfasst rein exemplarisch zwei seitlich angeordnete Rahmenteile 35, 36, die zusammen mit einer plattenförmig ausgebildeten Druckwerkschnittstelle 37 den Trägerrahmen 38 des Druckwerks 21 bilden und eine U-förmige Profilierung bestimmen. Die Druckwerkschnittstelle 37 ist an einer Oberseite 39 mit einer nachstehend näher beschriebenen Druckwerkaufnahme 40 verbunden.The
In einem Zwischenraum zwischen den Rahmenteilen 35, 36 ist ein Farbwerk 43 angeordnet, das nachstehend in Zusammenhang mit der
An einem gemäß der Darstellung der
An einer rein exemplarisch eben ausgebildeten Unterseite 48 der Kupplungsplatte 47 ist ein Druckkopfmodul 49 angebracht, das gemäß der Darstellung der
Beispielhaft ist vorgesehen, dass der Druckkopfträger 50 an einer der Kupplungsplatte 47 zugewandten Oberseite 51 eben ausgebildet ist, so dass die Oberseite 51 in flächige Anlage zur Unterseite 48 gebracht werden kann und hiermit eine Trägerschnittstelle bildet. Um eine exakte und reproduzierbare räumliche Ausrichtung zwischen dem Druckkopfträger 50 und der Kupplungsplatte 47 zu gewährleisten sind rein exemplarisch an der Oberseite 51 zwei exakt zueinander positionierte Zentrierstifte 52, 53 angebracht, die in Richtung der Kupplungsplatte 47 über die Oberseite 51 hinausragen und in ebenfalls exakt zueinander positionierte, nicht dargestellte Passbohrungen in der Kupplungsplatte 47 eingreifen können und somit als Bestandteile der Trägerschnittstelle angesehen werden können.For example, it is provided that the
Um eine exakte Ausrichtung der Druckköpfe 22, 23 und 24 relativ zu den als Zentriermittel dienenden Zentrierstiften 52, 53 zu gewährleisten ist es vorgesehen, sowohl den fest mit dem Druckkopfträger 50 verschraubten Druckkopf 22 als auch die jeweils linearbeweglich verstellbar am Druckkopfträger 50 angeordneten Druckköpfe 23, 24 unter Verwendung einer hochpräzisen Messeinrichtung wie einem Messtisch auszurichten und nach erfolgreicher Ausrichtung die jeweiligen, nur symbolisch dargestellten Befestigungsschrauben 54 zu fixieren. Für die linearbewegliche Anordnung der Druckköpfe 23, 24 ist jedem der Druckköpfe 24 ein elektrischer Linearsteller 55 zugeordnet.In order to ensure an exact alignment of the
In der Darstellung der
Um eine kompakte und wartungsfreundliche Anordnung der Komponenten des Druckwerks 21 sowie der Peripheriekomponenten zu erzielen, sind diese in der Reihenanordnung längs einer, insbesondere parallel zur Druckrichtung 28 ausgerichteten Erstreckungsachse 58 aufgereiht, die rein exemplarisch die Reihenfolge der Komponenten in vertikaler Richtung nach unten repräsentiert.In order to achieve a compact and maintenance-friendly arrangement of the components of the
Somit kann insbesondere auf das Druckkopfmodul 49 und auf die am Druckkopfträger 50 angebrachten, wartungsintensiveren Druckköpfe 22, 23, 24 in einfacher Weise zugegriffen werden.Thus, in particular, the
Durch die rein exemplarisch als Zentrierstifte 52, 53 ausgebildeten Zentriermittel und die zueinander korrespondierenden Flächen (Unterseite 48 und Oberseite 51) ist ein einfacher Austausch des Druckkopfträgers 50 gewährleistet, wobei die Position des Druckkopfträgers 50 präzise reproduzierbar ist. Ferner weist der Druckkopfträger 50 mit den daran angebrachten Druckköpfen 22, 23 und 24 lediglich ein relativ geringes Volumen auf, so dass ein Versand von Ersatz- und Austauschteilen auf dem Postweg möglich ist und damit aufgetretene Probleme an den Druckköpfen 22, 23 und 24 weltweit in kurzer Zeit gelöst werden können.The centering means, designed purely by way of example as centering
In der Darstellung der
Aus der schematischen Darstellung der
Die Schnittstellenebene 83 ist durch die Verbindung zwischen der Druckkopfschnittstelle 44 und dem Druckkopfmodul 49 bestimmt. Unterhalb der Werkstückebene 61 bildet die Oberseite des Trocknungsmoduls 57 eine weitere Schnittstellenebene 84, die jedoch abweichend von den anderen Schnittstellenebenen 80 bis 83 keine mechanische Verbindung zu anderen Komponenten beschreibt, sondern lediglich eine Austrittsebene für die vom Trocknungsmodul 57 bereitgestellten elektromagnetischen Wellen, insbesondere UV-Strahlen.The
Wie aus der Darstellung der
Die Farbleitung 75 ist mit einer im Farbwerk 43 angeordneten Ventileinrichtung 68 verbunden, die beispielsweise als Proportionalventil ausgebildet ist und die elektrisch mit einer ebenfalls dem Farbwerk 43 zugehörigen Steuereinrichtung 69 gekoppelt ist. Die Steuereinrichtung 69 ist derart für eine Ansteuerung der Ventileinrichtung 68 ausgebildet, dass stets eine korrekte Farbzuteilung an das Druckkopfmodul 49 über eine auch als Abgabeleitung bezeichnete Versorgungsleitung 70 erfolgt, die sich im Druckkopfmodul 49 verzweigt, um jeden der Druckköpfe 22, 23 und 24 mit Druckfarbe versorgen zu können. Die Versorgungsleitung 70 ist im Detail in der
Die Steuereinrichtung 69 ist ferner für eine Ansteuerung des Linearantriebs 46 vorgesehen, wobei die vom Linearantrieb 46 bereitgestellte, in radialer Richtung ausgerichtete Linearbewegung mit einer Rotationsbewegung der Werkstückträger 4 und der daran aufgenommenen Werkstücke 6 überlagert werden kann, um auf den Werkstücken 6 spiralförmige Druckbahnen für die von den Druckköpfen 22, 23 und 24 abgegebenen Druckfarbentröpfchen zu erzeugen. Hierzu ist zwischen der Steuereinrichtung 69 und dem Linearantrieb 46 eine Steuerleitung 72 ausgebildet, mit der auch eine Ansteuerung des Linearstellers 55 für eine Relativbewegung der Druckköpfe 23, 24 gegenüber den Druckköpfen 22 ermöglicht wird.The
Unterhalb der Werkstückebene 61 ist für jeden der Werkstückträger 4 ein Trocknungsmodul 57 angeordnet, das rein exemplarisch mit einem Reinigungsmodul 73 kombiniert ist, wobei das Trocknungsmodul 57 und das Reinigungsmodul 73 mit Hilfe eines nur symbolisch dargestellten Aktors 74 linearbeweglich am Maschinenbett 31 angeordnet sind und zudem eine Höhenverstellung für das Reinigungsmodul 73 vorgenommen werden kann, um dieses unmittelbar gegenüberliegend zu den Druckköpfen 22, 23, 24 anordnen zu können.Below the
Das Trocknungsmodul 57 umfasst beispielhaft eine leistenförmig ausgebildete Anordnung von nicht näher dargestellten Leuchtmitteln, insbesondere Leuchtdioden, die zur Bereitstellung von ultravioletter Strahlung ausgebildet sind, wobei die Leuchtmittel längs einer Rotationsachse des jeweiligen Werkstückträgers 4 erstreckt sind. Damit können die von den Leuchtmitteln bereitgestellten Lichtstrahlen bei einer Rotation des Werkstücks um die Rotationsachse die gesamte Außenoberfläche des Werkstücks erfassen und somit beispielsweise eine Aushärtung von Druckfarbe, die mit dem Druckwerk aufgebracht wurde, erzielen. Vorzugsweise ist vorgesehen, dass das jeweilige Trocknungsmodul 57 zur Durchführung des Trockungs- oder Aushärtungsvorgangs in vertikaler Richtung unterhalb des jeweiligen Werkstückträgers 4 angeordnet werden kann. Dabei ist vorgesehen, dass das jeweilige Trocknungsmodul 57 die in der
Beispielhaft ist vorgesehen, dass das Trocknungsmodul 57 mit dem Reinigungsmodul 73 eine Baugruppe bildet, die gemeinsam mit Hilfe des Aktors 74 aus der in
Claims (15)
- Rotary table digital printing machine (1) for printing on work pieces (6) in an inkjet digital printing method, comprising a machine frame (30) on which a work piece rotary table (3) is rotatably mounted about a rotation axis (2), the work piece rotary table (3) is provided with a plurality of work piece carriers (4), which are all arranged with the same angular pitch and the same distance from the rotation axis (2), wherein a drive unit is assigned to the work piece rotary table (3) for providing a rotary step movement, wherein said machine frame (30) comprises at least one holding frame (34) designed for receiving workstations (8 to 18), which workstations (8 to 18) are adapted for processing of the work pieces (6), wherein at least one workstation (8 to 18) is attached to the holding frame (34) and is designed as a printing unit (21) for printing on the work pieces (6), wherein the printing unit (21) comprises a support frame (38) which is designed to receive an inking unit (43) and a print head module (49) and which has a printing unit interface (37) which is designed for coupling with a printing unit receptacle (40) associated with the holding frame (34), wherein the support frame (38) comprises a print head interface (44) which is adapted for coupling to the print head module (49), further comprising the print head module (49) which is adapted for dispensing ink droplets in a printing direction (12) onto a work piece (6) and comprising a print head carrier (50) and at least one print head (22, 23, 24) fixed to the print head carrier (50), and further comprising the inking unit (43) which is configured to provide ink to the print head module (49), the print head carrier (50) comprising a carrier interface (51, 52, 53) adapted for coupling to the print head interface (44), wherein the printing unit receptacle (40), the printing unit interface (37), the inking unit (43), the print head interface (44), the carrier interface (51, 52, 53) and the print head module (49) are arranged in a row arrangement extending along the printing direction (28).
- Rotary table digital printing machine (1) according to claim 1, characterized in that the carrier interface (51, 52, 53) and the print head interface (44) comprise two pairs of centering elements (52, 53), which are designed for reproducible positioning of the print head carrier (50) on the support frame (38).
- Rotary table digital printing machine (1) according to claim 2, characterized in that the at least one print head (22, 23, 24) is arranged in a predeterminable arrangement with respect to the at least two centering elements (52, 53) formed on the print head carrier (50).
- Rotary table digital printing machine (1) according to claim 2 or 3, characterized in that the carrier interface (51, 52, 53) and/or the print head interface (44) comprise a planar surface (48, 51) oriented normal to the printing direction (28), wherein at least two centering elements (52, 53) are arranged on the planar surface (51).
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that the print head interface (44) is movably mounted on the support frame (38) with at least one, in particular with exactly one, degree of freedom of movement and in that an adjusting device (46) for a provision of a, in particular linear, adjusting movement between the support frame (38) and print head interface (44) is provided.
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that the inking unit (43) comprises a control unit (69), a color pipe (75) for an ink supply and a discharge pipe (70) for an ink discharge to the print head module (49), wherein the color pipe (75) and the discharge pipe (70) are connected to a valve unit (68), which is designed to influence an ink volume flow in the discharge pipe (70), and wherein the control unit (69) is designed to control the valve unit (68) and/or the at least one print head (22, 23, 24).
- Rotary table digital printing machine (1) according to claim 6, characterized in that the print head module (49) at least two print heads (22, 23, 24), each print head (22, 23, 24) having a plurality of printing nozzles which are arranged along a radial direction with constant pitch and forming a row of nozzles, the nozzle rows of the respective print heads are arranged parallel to each other and wherein at least one of the print heads (22, 23, 24) comprises a positioning device (55) which is designed for a linear displacement of the respective print head (22, 23, 24) in the radial direction relative to the print head carrier (50), wherein the control unit (69) is designed for a control of the print heads (22, 23, 24) and the positioning device (55).
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that at least one positioning unit for influencing a spatial orientation of the printing unit interface (37) with respect to the holding frame (34) is arranged between a printing unit receptacle (40) attached on the holding frame (34) and the holding frame (34).
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that a color processing module (56) arranged adjacent to the printing unit interface (37) is arranged on an end region of the row arrangement which end region is opposite the print head module (49) and that the color processing module (56) is connected to a color pipe (75), which is designed for supplying ink to the inking unit (43).
- Rotary table digital printing machine (1) according to claim 9, characterized in that the color processing module (56) comprises a pump unit (59) for conveying printing ink and/or comprises an ink reservoir (62) for temporary storage of printing ink and/or comprises a temperature control unit (67) for a temperature control of the printing ink and/or comprises a degassing unit (65) for degassing the printing ink and/or comprising a filter unit (66) for filtering the printing ink.
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that opposite to the print head module (49) a drying module (57) is arranged in the row arrangement and is arranged on the machine frame (30), which delimits a work piece gap with the print head module (49) in the printing direction (28) and which is designed for providing drying energy to a work piece (6) arranged in the work piece gap.
- Rotary table digital printing machine (1) according to one of the preceding claims, characterized in that the work piece carriers (4) determine a work piece plane (61) oriented normal to the rotation axis (2) of the work piece rotary table (3) and that the printing unit interface (37), the inking unit (43), the print head interface (44), the carrier interface (51, 52, 53) and the print head module (49) are arranged in the vertical direction above the work piece plane (61).
- Rotary table digital printing machine (1) according to claim 12, characterized in that at least one color reservoir (60) and a cleaning module (73), in particular combined with a drying module (57), are arranged in an area arranged in the vertical direction below the work piece plane (61).
- Rotary table digital printing machine (1) according to claim 1, characterized in that the printing direction (28) is aligned parallel to the, in particular vertically oriented, rotation axis (2).
- Printing unit (21) for use in a rotary table digital printing machine (1), comprising a support frame (38) adapted to receive an inking unit (43) and a print head module (49) and which has a printing unit interface (37), which is adapted for coupling to a printing unit receptacle (40) of the rotary table digital printing machine (1), and which has a print head interface (44) which is designed for coupling with a print head module (49) wherein the print head module (49) is adapted for dispensing ink droplets in a printing direction (28) onto a printing object (6) and comprising a print head carrier (50) and at least one print head (22, 23, 24) fixed to the print head carrier (50), and an inking unit (43) configured to provide a printing ink to the print head module (49), the inking unit (43) comprising a color pipe (75) for an ink supply and a discharge pipe (70) for an ink discharge, wherein the color pipe (75) and the discharge pipe (70) are connected to a valve unit (68) which is designed for influencing an ink volume flow in the discharge pipe (70), wherein the print head carrier (50) comprises a carrier interface (51, 42, 53) which is adapted for coupling to the print head interface (44), wherein the printing unit interface (37), the inking unit (43), the print head interface (44), the carrier interface (51, 52, 53) and the print head module (49) are arranged in series along the printing direction (28).
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES17196877T ES2823252T3 (en) | 2017-10-17 | 2017-10-17 | Circular tabletop digital printer and printing mechanism |
EP17196877.9A EP3473446B1 (en) | 2017-10-17 | 2017-10-17 | Roundtable digital printing machine and printing unit |
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 (en) | 2017-10-17 | 2018-10-16 | Rotary table digital printing machine and printing unit |
JP2018195840A JP7231189B2 (en) | 2017-10-17 | 2018-10-17 | Rotary table digital printer and printing unit |
CN201811208564.9A CN109664613B (en) | 2017-10-17 | 2018-10-17 | Rotary table digital printer and printing unit |
IL262436A IL262436B (en) | 2017-10-17 | 2018-10-17 | Rotary table digital printing machine and printing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17196877.9A EP3473446B1 (en) | 2017-10-17 | 2017-10-17 | Roundtable digital printing machine and printing unit |
Publications (2)
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EP3473446A1 EP3473446A1 (en) | 2019-04-24 |
EP3473446B1 true EP3473446B1 (en) | 2020-08-26 |
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EP17196877.9A Active EP3473446B1 (en) | 2017-10-17 | 2017-10-17 | Roundtable digital printing machine and printing unit |
Country Status (8)
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US (1) | US10696068B2 (en) |
EP (1) | EP3473446B1 (en) |
JP (1) | JP7231189B2 (en) |
CN (1) | CN109664613B (en) |
CA (1) | CA3020116A1 (en) |
ES (1) | ES2823252T3 (en) |
IL (1) | IL262436B (en) |
TW (1) | TWI775967B (en) |
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2018
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- 2018-10-09 CA CA3020116A patent/CA3020116A1/en active Pending
- 2018-10-16 TW TW107136307A patent/TWI775967B/en active
- 2018-10-17 CN CN201811208564.9A patent/CN109664613B/en active Active
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Publication number | Publication date |
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ES2823252T3 (en) | 2021-05-06 |
IL262436B (en) | 2022-04-01 |
EP3473446A1 (en) | 2019-04-24 |
US20190111709A1 (en) | 2019-04-18 |
TW201922519A (en) | 2019-06-16 |
JP2019093704A (en) | 2019-06-20 |
CN109664613A (en) | 2019-04-23 |
TWI775967B (en) | 2022-09-01 |
CA3020116A1 (en) | 2019-04-17 |
US10696068B2 (en) | 2020-06-30 |
JP7231189B2 (en) | 2023-03-01 |
IL262436A (en) | 2019-03-31 |
CN109664613B (en) | 2022-07-22 |
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