EP2756956A1 - Method for the generation of a printed image on a rotating, three-dimensional body - Google Patents
Method for the generation of a printed image on a rotating, three-dimensional body Download PDFInfo
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- EP2756956A1 EP2756956A1 EP20130195592 EP13195592A EP2756956A1 EP 2756956 A1 EP2756956 A1 EP 2756956A1 EP 20130195592 EP20130195592 EP 20130195592 EP 13195592 A EP13195592 A EP 13195592A EP 2756956 A1 EP2756956 A1 EP 2756956A1
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- Prior art keywords
- rotation
- printing
- distance
- radius
- fundamental frequency
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007639 printing Methods 0.000 claims abstract description 36
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000007641 inkjet printing Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000011161 development Methods 0.000 description 11
- 230000018109 developmental process Effects 0.000 description 11
- 230000001419 dependent effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
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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
- 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
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- 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 present invention relates to a method for producing a printed image on a rotating, three-dimensional body having the features of the preamble of claim 1.
- the DE 10 2009 003 810 A1 For example, describes a system for printing on containers. It addresses the problem that the centering of the holder or the container is critical for printing at conventional 600 dpi and high conveying speeds.
- the solution to the problem is that the print head is automatically adjustable, using sensors that determine the location and angular position of the container and send these values to a controller. An adjustment of the timing for the inkjet printing unit is not described.
- the DE 10 2009 014 663 A1 describes the non-contact (electro-optical or electromagnetic) determination of the rotational position of bottles by means of sensor unit and measuring marks.
- paragraph 20 is explicitly described that the container longitudinal axis BA corresponds approximately to the axis of rotation DA: eccentrically rotating bottles are thus not recognized as a problem and accordingly offered no solution. An adaptation of the timing is not described.
- bodies positioned eccentrically on a turntable constantly change their distance from a stationary printing unit, even at a constant angular speed of the turntable, whereby the surface portion of the body facing and facing the printing unit undergoes a constant change in web speed.
- This can lead to noticeable and therefore undesirable errors in the printed image to be generated as a result of changing printing resolution.
- Similar problems can occur when the body is centered on the turntable, but its outer surface in the section to be printed is not cylindrical or cylindrical section-shaped, or the angular velocity of the turntable changes.
- a direct measurement of the belt speed or its change is not possible with simple means.
- the method according to the invention advantageously makes it possible to use rotating, three-dimensional bodies, e.g. Bottles, or their (outer) surfaces or portions thereof having a desired printing resolution, e.g. with a constant dpi value, to print by the ink jet method even if the web speed of the surface portion to be printed and therefore facing an ink jet printing unit changes.
- its radius change at a preferably fixed measuring point is determined during the rotation of the body. This change in radius at the measuring point may occur e.g. from an eccentric positioning of the body, from its non-cylindrical shape or from a change in the angular velocity of the rotation of the body.
- the pressure cycle for the ink jet nozzles according to the invention is adapted to the radius change and the concomitant change in the web speed of the (outer) surface portion to be printed at the pressure point.
- the measuring point and the pressure point are therefore preferably chosen so that they have at least one correlation. It may, for example, the measuring point in the direction of rotation of the body lie in front of the pressure point and the spatial distance converted into a time distance and taken into account in the control of the printing unit.
- the measuring point can also be substantially identical to the pressure point or be offset parallel to the axis of rotation (the latter preferably in the case of a non-changing in the direction of the axis of rotation of the body).
- variables are given as a function of time t, for example f 0 (t), .DELTA.R (t), k (t) and f (t).
- ⁇ ⁇ (t) ⁇ t
- ⁇ (t) is the angular velocity of the rotation.
- the variables for the values ⁇ specify 0 to 360 ° or even in a narrower angular range, if to be printed only in this.
- the determination of the radius change preferably takes place substantially immediately prior to the printing. However, according to an alternative, it may also be provided that the determination of the radius change has already been made for a period of time, e.g. a few seconds or minutes, before printing and store the result in a cam and use this when printing for the frequency correction. If the problem of radius change is essentially caused solely by the (outer) shape of the body, its shape or radius change during a complete rotation can also be permanently stored and retrieved whenever such bodies are printed.
- a preferred development of the method according to the invention can be distinguished by the fact that the determination of the radius change ⁇ R (t) takes place as non-contact measuring with a rangefinder, in particular with a triangulation measuring device.
- a rangefinder in particular with a triangulation measuring device.
- Triangulation measuring devices or sensors also have the advantage that essentially all materials can be detected and that these allow very fast measurements. Alternatively, it can also be provided to use capacitive or inductive working distance sensors.
- this approach is advantageous because the device allows the distance to the surface, so the distance D (t) to measure directly. From this distance lets calculate the radius change.
- R 0 are calculated according to the given formula.
- a further preferred development of the method according to the invention can be distinguished by the fact that the calculation of the correction value k (t) takes place substantially continuously. It can e.g. be provided to determine the radius change continuously, at least continuously during a complete revolution of the body (or less, if only a peripheral portion to be printed) and from the value for ⁇ R (t) the value of k (t) and from there the value of f (t) to calculate for the control. If the measuring point substantially coincides with the pressure point or the time offset .DELTA.t between measuring and printing is known, a real-time correction of the control frequency f (t) can advantageously take place with the use of fast computers and data connections, possibly with a time offset of .DELTA.t ,
- a device for carrying out the above-mentioned inventive method and its developments is to be seen.
- Such a device has the components necessary for carrying out the method steps according to the invention: an inkjet printing unit with control, a motor with control, a rangefinder and a computer for the calculations of the correction value.
- FIG. 1 shows a device 1 for printing, ie for generating a printed image of rotating, three-dimensional bodies 2.
- a bottle to be printed is shown, wherein not the complete surface 3 of the bottle, but only a section 4, for example a label or a band, to be printed.
- the bottle is essentially rotationally symmetrical, but it is not centered on a turntable 5, that is, its axis of symmetry does not coincide with the axis of rotation A of the turntable.
- R (t) Due to the (usually unwanted) eccentric recording on the turntable occurs during the rotation of the turntable and thus the body at a time t changing distance D (t) between the surface of the body and an ink jet printing unit 6 and their ink jet nozzles 7 arranged substantially on a straight line G and at a time-varying radius R (t).
- R (t) is determined as the distance of the surface of the body facing the ink-jet printing unit (the location of the surface at which the ink drops 8 are to hit the surface) to the axis of rotation.
- the axis of rotation is aligned substantially parallel to the straight line G.
- D 0 is the substantially constant distance between the ink jet nozzles and the axis of rotation and R 0 the mean radius of the body, in the example, the substantially constant radius of the bottle, designated.
- ⁇ R (t) denotes the change in radius between the surface of the body facing the ink-jet printing unit and the surface of an imaginary center 2 'received on the turntable, directed toward the ink-jet printing unit.
- the distance between the surface of the imaginary body facing the ink-jet printing unit and the Ink jet printing unit is denoted by D (t) M.
- D (t) M can also be understood as a time average of the distance D (t) changing with time t.
- the device 1 further comprises a rangefinder 8, in particular a triangulation measuring device, with which the determination of the radius change ⁇ R (t) takes place as non-contact measuring.
- presetting the mean radius R 0 of the body eg, if this body is non-rotationally symmetric, flattened, or irregularly shaped
- FIG. 1 a motor 11 for driving the rotation of the body 2, that is, in the example shown, for rotationally driving the turntable 5.
- the motor is driven at a predetermined fundamental frequency f 0 (t).
- the predetermined angular velocity is a constant ⁇ 0
- a rotationally symmetrical body is for example 2 with kontantem radius R 0 ⁇ rotated at a constant angular speed 0, wherein the body rotates eccentrically.
- the ink jet nozzles 7 require a printing stroke f (t) for printing, with which the ink droplets are ejected.
- This pressure cycle is generated by the control unit 10 as a frequency and transmitted to a pressure control unit 13 and from this to the pressure unit 6.
- the calculation of the correction value k (t) preferably takes place essentially continuously.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ink Jet (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Erzeugen eines Druckbildes auf einem rotierenden, dreidimensionalen Körper mit den Merkmalen des Oberbegriffs von Anspruch 1.The present invention relates to a method for producing a printed image on a rotating, three-dimensional body having the features of the preamble of
Aus der
Es ist jedoch auch bereits bekannt, rotierende, dreidimensionale Körper, z.B. Flaschen in Abfüllanlagen, mittels einer Tintenstrahl- Druckeinheit zu bedrucken und es ist dabei auch bereits das Problem erkannt worden, dass die rotierenden Körper Abweichungen von ihrer Soll-Position aufweisen können und dadurch Störungen im zu erzeugenden Druckbild hervor gerufen werden können.However, it is also already known to use rotating, three-dimensional bodies, e.g. Bottles in bottling plants to print by means of an inkjet printing unit and it is also already been recognized the problem that the rotating body may have deviations from their desired position and thereby disturbances in the printed image to be generated can be called out.
Die
Die
Exzentrisch auf einem Drehteller positionierte Körper ändern jedoch, selbst bei konstanter Winkelgeschwindigkeit des Drehtellers, ständig ihren Abstand zu einer ortsfesten Druckeinheit, wodurch der der Druckeinheit zugewandte und zu bedruckende Oberflächenabschnitt des Körpers eine ständige Änderung der Bahngeschwindigkeit erfährt. Hierdurch kann es zu merklichen und daher unerwünschten Fehlern im zu erzeugenden Druckbild infolge einer sich ändernden Druckauflösung kommen. Ähnliche Probleme können auftreten, wenn der Körper zwar zentriert auf dem Drehteller aufgenommen ist, seine Außenoberfläche im zu bedruckenden Abschnitt jedoch nicht zylinderförmig bzw. zylinderabschnittförmig ist oder sich die Winkelgeschwindigkeit des Drehtellers ändert. Eine direkte Messung der Bandgeschwindigkeit bzw. deren Änderung ist jedoch nicht mit einfachen Mitteln möglich.However, bodies positioned eccentrically on a turntable constantly change their distance from a stationary printing unit, even at a constant angular speed of the turntable, whereby the surface portion of the body facing and facing the printing unit undergoes a constant change in web speed. This can lead to noticeable and therefore undesirable errors in the printed image to be generated as a result of changing printing resolution. Similar problems can occur when the body is centered on the turntable, but its outer surface in the section to be printed is not cylindrical or cylindrical section-shaped, or the angular velocity of the turntable changes. However, a direct measurement of the belt speed or its change is not possible with simple means.
Vor diesem Hintergrund ist es Aufgabe der vorliegenden Erfindung, ein gegenüber dem Stand der Technik verbessertes Verfahren zu schaffen, welches es ermöglicht, rotierende, dreidimensionale Körper mit einer gewünschten Druckauflösung zu bedrucken, selbst wenn sich die Bahngeschwindigkeit des zu bedruckenden und daher einer Druckeinheit zugewandten Oberflächenabschnitts ändert.Against this background, it is an object of the present invention to provide a comparison with the prior art improved method, which makes it possible to print rotating, three-dimensional body with a desired print resolution, even if the web speed of the printable and therefore a printing unit facing surface portion changes.
Diese Aufgaben werden erfindungsgemäß durch ein Verfahren mit den Merkmalen von Anspruch 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den zugehörigen Unteransprüchen sowie aus der Beschreibung und den zugehörigen Zeichnungen.These objects are achieved by a method having the features of
Ein erfindungsgemäßes Verfahren zum Erzeugen eines Druckbildes auf einem rotierenden, dreidimensionalen Körper, wobei eine Tintenstrahl-Druckeinheit mit mehreren, im Wesentlichen auf einer Geraden angeordneten Tintenstrahldüsen zum Drucken mit einem Drucktakt vorgesehen ist, der Körper um eine zur Geraden im Wesentlichen parallelen Rotationsachse rotiert, und ein Motor zum Antreiben der Rotation des Körpers vorgesehen ist, und mit den Verfahrensschritten: Vorgeben einer Grundfrequenz f0(t) für das Ansteuern des Motors, Ansteuern des Motors mit der Grundfrequenz f0(t), und Vorgeben eines mittleren Radius R0 des Körpers, zeichnet sich durch die weiteren Verfahrensschritte aus: Bestimmen der Radiusänderung ΔR(t) des Körpers während des Rotierens des Körpers, Berechnen eines Korrekturwertes k(t) für einen Drucktakt der Druckeinheit, wobei k(t) = 1 + ΔR(t) / R0, und Ansteuern der Druckeinheit mit einer Frequenz f(t) für den Drucktakt wobei f(t) = f0(t) · k(t).An inventive method for producing a printed image on a rotating, three-dimensional body, wherein an ink jet printing unit with a plurality of ink jet nozzles arranged substantially on a straight line for printing with a pressure tact, the body rotates about a rotational axis substantially parallel to the straight line, and a motor for driving the rotation of the body is provided, and comprising the steps of: setting a fundamental frequency f 0 (t) for driving the motor, driving the motor with the fundamental frequency f 0 (t), and specifying a mean radius R 0 of the body, characterized by the further steps of: determining the radius change ΔR (t) of the body during rotating the body, calculating a correction value k (t) for a printing stroke of the printing unit, where k (t) = 1 + ΔR (t) / R 0 , and driving the printing unit at a frequency f (t) for the printing clock, where f (t) = f 0 (t) * k (t).
Das erfindungsgemäße Verfahren ermöglicht es in vorteilhafter Weise, rotierende, dreidimensionale Körper, z.B. Flaschen, bzw. deren (Außen-) Oberflächen oder Abschnitte davon mit einer gewünschten Druckauflösung, z.B. mit einem konstanten dpi-Wert, im Tintenstrahlverfahren zu bedrucken, selbst wenn sich die Bahngeschwindigkeit des zu bedruckenden und daher einer Tintenstrahl-Druckeinheit zugewandten Oberflächenabschnitts ändert. Erfindungsgemäß wird während des Rotierens des Körpers dessen Radiusänderung an einer bevorzugt festen Messstelle bestimmt. Diese Radiusänderung an der Messstelle kann sich z.B. aus einer exzentrischen Positionierung des Körpers, aus dessen nicht zylindrischer Form oder aus einer Änderung der Winkelgeschwindigkeit der Rotation des Körpers ergeben.The method according to the invention advantageously makes it possible to use rotating, three-dimensional bodies, e.g. Bottles, or their (outer) surfaces or portions thereof having a desired printing resolution, e.g. with a constant dpi value, to print by the ink jet method even if the web speed of the surface portion to be printed and therefore facing an ink jet printing unit changes. According to the invention, its radius change at a preferably fixed measuring point is determined during the rotation of the body. This change in radius at the measuring point may occur e.g. from an eccentric positioning of the body, from its non-cylindrical shape or from a change in the angular velocity of the rotation of the body.
Aus der Radiusänderung wird erfindungsgemäß ein Korrekturwert berechnet und die Druckeinheit mit einer gegenüber der Grundfrequenz korrigierten Frequenz angesteuert. Somit wird der Drucktakt für die Tintenstrahldüsen erfindungsgemäß an die Radiusänderung und die damit einhergehende Änderung der Bahngeschwindigkeit des zu bedruckenden (Außen-) Oberflächenabschnitts an der Druckstelle angepasst.From the change in radius, a correction value is calculated according to the invention and the printing unit is driven with a frequency corrected relative to the fundamental frequency. Thus, the pressure cycle for the ink jet nozzles according to the invention is adapted to the radius change and the concomitant change in the web speed of the (outer) surface portion to be printed at the pressure point.
Die Messstelle und die Druckstelle sind daher bevorzugt so gewählt, dass diese zumindest eine Korrelation aufweisen. Es kann z.B. die Messstelle in Rotationsrichtung des Körpers vor der Druckstelle liegen und die räumliche Distanz in eine zeitliche Distanz umgerechnet und bei der Ansteuerung der Druckeinheit berücksichtigt werden. Die Messstelle kann auch im Wesentlichen identisch mit der Druckstelle sein oder parallel zur Rotationsachse versetzt sein (letzteres bevorzugt im Falle eines sich in Richtung der Rotationsachse nicht ändernden Radius des Körpers).The measuring point and the pressure point are therefore preferably chosen so that they have at least one correlation. It may, for example, the measuring point in the direction of rotation of the body lie in front of the pressure point and the spatial distance converted into a time distance and taken into account in the control of the printing unit. The measuring point can also be substantially identical to the pressure point or be offset parallel to the axis of rotation (the latter preferably in the case of a non-changing in the direction of the axis of rotation of the body).
In dieser Anmeldung sind gewisse Variablen als von der Zeit t abhängig angegeben, z.B. f0(t), ΔR(t), k(t) und f(t). Alternativ dazu können diese Variablen auch als vom Winkel α der Rotation abhängig angegeben werden, wobei α = ω(t) · t gilt, mit ω(t) als Winkelgeschwindigkeit der Rotation. Bei konstanter Winkelgeschwindigkeit ω0 ist es dabei ausreichend, die Variablen für die Werte α = 0 bis 360° anzugeben oder sogar in einem engeren Winkelbereich, falls nur in diesem gedruckt werden soll.In this application, certain variables are given as a function of time t, for example f 0 (t), .DELTA.R (t), k (t) and f (t). Alternatively, these variables may also be indicated as dependent on the angle α of the rotation, where α = ω (t) · t, where ω (t) is the angular velocity of the rotation. At a constant angular velocity ω 0, it is sufficient, the variables for the values α = specify 0 to 360 ° or even in a narrower angular range, if to be printed only in this.
Das Bestimmen der Radiusänderung erfolgt bevorzugt im Wesentlichen zeitlich unmittelbar vor dem Bedrucken. Gemäß einer Alternative kann jedoch auch vorgesehen sein, das Bestimmen der Radiusänderung bereits eine Zeitspanne, z.B. einige Sekunden oder Minuten, vor dem Bedrucken durchzuführen und das Ergebnis in einer Steuerkurve abzulegen und diese beim Bedrucken für die Frequenz-Korrektur zu nutzen. Sofern das Problem der Radiusänderung im Wesentlichen allein durch die (Außen-) Form des Körpers hervorgerufen wird, kann dessen Form bzw. Radiusänderung bei einer vollständigen Rotation auch dauerhaft gespeichert werden und immer dann abgerufen werden, wenn solche Körper bedruckt werden.The determination of the radius change preferably takes place substantially immediately prior to the printing. However, according to an alternative, it may also be provided that the determination of the radius change has already been made for a period of time, e.g. a few seconds or minutes, before printing and store the result in a cam and use this when printing for the frequency correction. If the problem of radius change is essentially caused solely by the (outer) shape of the body, its shape or radius change during a complete rotation can also be permanently stored and retrieved whenever such bodies are printed.
Eine bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass das Bestimmen der Radiusänderung ΔR(t) als berührungsloses Messen mit einem Entfernungsmesser erfolgt, insbesondere mit einem Triangulations-Messgerät. Gegenüber nicht berührungslos arbeitenden Entfernungsmessern bzw. Sensoren ergibt sich der Vorteil, dass keine störenden Einflüsse auf die zu bedruckende oder bereits bedruckte Oberfläche, z.B. durch Verformung oder Abrieb, ausgeübt werden und dadurch Fehler im Druckbild in vorteilhafter weise vermieden werden können. Triangulations-Messgeräte bzw. -sensoren haben zudem den Vorteil, dass im Wesentlichen alle Materialien erfasst werden können und dass diese sehr schnelle Messungen erlauben. Alternativ kann auch vorgesehen sein, kapazitiv oder induktive arbeitende Abstandssensoren einzusetzen.A preferred development of the method according to the invention can be distinguished by the fact that the determination of the radius change ΔR (t) takes place as non-contact measuring with a rangefinder, in particular with a triangulation measuring device. Compared with non-contact rangefinders or sensors there is the advantage that no disturbing influences on the surface to be printed or already printed, for example, by deformation or abrasion, and thus errors in the printed image can be advantageously avoided. Triangulation measuring devices or sensors also have the advantage that essentially all materials can be detected and that these allow very fast measurements. Alternatively, it can also be provided to use capacitive or inductive working distance sensors.
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass mit dem Entfernungsmesser der Abstand D(t) zwischen den Tintenstrahldüsen und der Oberfläche des Körpers an der Stelle gemessen wird, an der die Tintentropfen auf die Oberfläche treffen sollen, wobei ΔR(t) = D(t)M - D(t) gilt, mit D(t)M als zeitlicher Mittelwert von D(t). Insbesondere beim Einsatz eines Triangulations-Messgeräts ist diese Vorgehensweise von Vorteil, da das Gerät die Distanz zur Oberfläche, also den Abstand D(t) direkt zu messen erlaubt. Aus diesem Abstand lässt sind die Radiusänderung berechnen.A further preferred development of the method according to the invention can be distinguished in that the distance meter measures the distance D (t) between the inkjet nozzles and the surface of the body at the point at which the ink drops are to hit the surface, where ΔR (t ) = D (t) M - D (t), with D (t) M as the time average of D (t). In particular, when using a triangulation meter, this approach is advantageous because the device allows the distance to the surface, so the distance D (t) to measure directly. From this distance lets calculate the radius change.
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass für den zeitlichen Mittelwert D(t)M = D0 - R0 gilt, mit D0 als Abstand zwischen den Tintenstrahldüsen und der Rotationsachse. Sofern also D0 und R0 bekannt sind, ist die Bestimmung von D(t) und damit auch von ΔR(t) sehr einfach, beispielsweise beim Bedrucken von Flaschen mit konstantem Radius R0 im zu bedruckenden Oberflächenabschnitt und beim Positionieren dieser Flaschen auf einem Drehteller mit Rotationsachse im konstanten Abstand D0 zu den Tintenstrahldüsen.A further preferred development of the method according to the invention can be distinguished by the fact that for the time average D (t) M = D 0 -R 0 , with D 0 as the distance between the inkjet nozzles and the axis of rotation. So if D 0 and R 0 are known, the determination of D (t) and thus of ΔR (t) is very simple, for example, when printing bottles with a constant radius R 0 in the surface to be printed and positioning these bottles on a Turntable with rotation axis at a constant distance D 0 to the inkjet nozzles.
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass das Vorgeben eines mittleren Radius R0 des Körpers auf dem Bestimmen von R0 = D0 - D(t)M beruht, mit D0 als Abstand zwischen den Tintenstrahldüsen und der Rotationsachse und mit D(t)M als zeitlicher Mittelwert von D(t). Sofern also z.B. der Körper eine unregelmäßige (Außen-) Form aufweist, im Gegensatz z.B. zu einer Flasche mit bekanntem und konstantem R0, kann in vorteilhafter Weise über eine Mittelwertbildung über einen Zeitraum, der einer Drehung um 360° entspricht (oder weniger, wenn nur ein Umfangsabschnitt bedruckt werden soll), R0 nach der angegebenen Formel berechnet werden.A further preferred development of the method according to the invention can be characterized in that the specification of a mean radius R 0 of the body is based on the determination of R 0 = D 0 -D (t) M , with D 0 as the distance between the inkjet nozzles and the axis of rotation and with D (t) M as the time average of D (t). Thus, for example, if the body has an irregular (outer) shape, in contrast, for example, to a bottle of known and constant R 0 , can advantageously by averaging over a period corresponding to a rotation of 360 ° (or less, if only one peripheral section is to be printed), R 0 are calculated according to the given formula.
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich durch den weiteren Verfahrensschritt auszeichnen: Vorgeben einer Winkelgeschwindigkeit ω(t) der Rotation des Körpers, wobei für die Grundfrequenz f0(t) = ω(t) · R0 /a gilt, mit a als Auflösung des Druckbildes. Aufgrund der Proportionalität zwischen der Winkelgeschwindigkeit und der Grundfrequenz, kann letztere bei Kenntnis der beim Drucken zu erzielenden Auflösung (z.B. als kleinster gewünschter Abstand der Druckpunkte in Umfangsrichtung) auf einfache Weise berechnet werden.A further preferred development of the method according to the invention can be characterized by the further step of: setting an angular velocity ω (t) of the rotation of the body, wherein for the fundamental frequency f 0 (t) = ω (t) · R 0 / a valid with a as a resolution of the printed image. Due to the proportionality between the Angular velocity and the fundamental frequency, the latter can be easily calculated with knowledge of the resolution to be achieved during printing (eg as the smallest desired distance of the pressure points in the circumferential direction).
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass die Winkelgeschwindigkeit eine Konstante ω0 ist und somit auch die Grundfrequenz eine Konstante f0 ist, wobei f0 = (ω0 · R0 / a.A further preferred embodiment of the method according to the invention can be characterized in that the angular velocity is a constant ω 0 and thus also the fundamental frequency is a constant f 0 , where f 0 = (ω 0 · R 0 / a.
Eine weitere bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass das Berechnen des Korrekturwertes k(t) im Wesentlichen kontinuierlich erfolgt. Es kann z.B. vorgesehen sein, die Radiusänderung kontinuierlich zu bestimmen, zumindest kontinuierlich während einer vollständigen Umdrehung des Körpers (oder weniger, wenn nur ein Umfangsabschnitt bedruckt werden soll) und aus dem Wert für ΔR(t) den Wert von k(t) und daraus den Wert von f(t) für die Ansteuerung zu berechnen. Wenn die Messstelle mit der Druckstelle im Wesentlichen zusammenfällt oder der zeitliche Versatz Δt zwischen Messen und Drucken bekannt ist, kann in vorteilhafter Weise bei Einsatz schneller Rechner und Datenverbindungen im Wesentlichen eine Echtzeitkorrektur der Steuerfrequenz f(t) erfolgen, ggf. mit einem Zeitversatz um Δt.A further preferred development of the method according to the invention can be distinguished by the fact that the calculation of the correction value k (t) takes place substantially continuously. It can e.g. be provided to determine the radius change continuously, at least continuously during a complete revolution of the body (or less, if only a peripheral portion to be printed) and from the value for ΔR (t) the value of k (t) and from there the value of f (t) to calculate for the control. If the measuring point substantially coincides with the pressure point or the time offset .DELTA.t between measuring and printing is known, a real-time correction of the control frequency f (t) can advantageously take place with the use of fast computers and data connections, possibly with a time offset of .DELTA.t ,
Im Rahmen der Erfindung ist auch eine Vorrichtung zur Durchführung des oben genannten erfindungsgemäßen Verfahrens und dessen Weiterbildungen zu sehen. Eine solche Vorrichtung weißt die für die Durchführung der erfindungsgemäßen Verfahrensschritte erforderlichen Komponenten auf: eine Tintenstrahl-Druckeinheit mit Steuerung, einen Motor mit Steuerung, einen Entfernungsmesser und einen Rechner für die Berechnungen des Korrekturwertes.In the context of the invention, a device for carrying out the above-mentioned inventive method and its developments is to be seen. Such a device has the components necessary for carrying out the method steps according to the invention: an inkjet printing unit with control, a motor with control, a rangefinder and a computer for the calculations of the correction value.
Die beschriebene Erfindung und die beschriebenen, vorteilhaften Weiterbildungen der Erfindung stellen auch in Kombination miteinander vorteilhafte Weiterbildungen der Erfindung dar.The described invention and the described, advantageous developments of the invention are also in combination with each other advantageous developments of the invention.
Die Erfindung als solche sowie konstruktiv und/oder funktionell vorteilhafte Weiterbildungen der Erfindung werden nachfolgend unter Bezug auf die zugehörige Zeichnung anhand eines bevorzugten Ausführungsbeispiels näher beschrieben.The invention as such and structurally and / or functionally advantageous developments of the invention will be described below with reference to the accompanying drawings with reference to a preferred embodiment.
Die Zeichnung zeigt:
- Fig. 1
- Eine schematische Darstellung eines bevorzugten Ausführungsbeispiels des erfindungsgemäßen Verfahrens anhand der Abläufe beim Betrieb einer Vorrichtung zum Bedrucken von rotierenden Körpern.
- Fig. 1
- A schematic representation of a preferred embodiment of the method according to the invention with reference to the procedures during operation of a device for printing of rotating bodies.
Die Vorrichtung 1 weist ferner einen Entfernungsmesser 8, insbesondere ein Triangulations-Messgerät, auf, mit dem das Bestimmen der Radiusänderung ΔR(t) als berührungsloses Messen erfolgt. Der Entfernungsmesser misst dabei zunächst den Wert von D(t). Aus diesem Wert und seinem Mittelwert D(t)M kann ΔR(t) nach der Formel ΔR(t) = D(t)M - D(t) berechnet werden. Diese Berechnung kann in einer Steuereinheit 10 erfolgen, der das Messergebnis D(t) zur Verfügung gestellt wird. Im einfachen Fall des Beispiels der Flasche mit konstantem und bekanntem Radius R0 kann D(t)M einfach nach der Formel D(t)M = D0 - R0 bestimmt werden, woraus sich ΔR(t) = D0 - R0 - D(t) ergibt. Andererseits kann das Vorgeben des mittleren Radius R0 des Körpers (z.B. wenn dieser Körper nicht-rotationssymmetrisch, abgeflacht oder unregelmäßig geformt ist) auf dem Bestimmen von R0 = D0 - D(t)M beruhen.The
Weiterhin zeigt
Die Tintenstrahldüsen 7 benötigen zum Drucken einen Drucktakt f(t), mit welchem die Tintentropfen ausgestoßen werden. Dieser Drucktakt wird von der Steuereinheit 10 als eine Frequenz erzeugt und einer Drucksteuereinheit 13 und von dieser der Druckeinheit 6 übermittelt. Das Ansteuern der Druckeinheit mit einer Frequenz f(t) für den Drucktakt erfolgt erfindungsgemäß nach der Formel f(t) = f0(t) · k(t), wobei k(t) ein Korrekturwert gegenüber der Frequenz, mit der der Motor 11 angesteuert wird, ist. Das Berechnen dieses Korrekturwertes k(t) für den Drucktakt der Druckeinheit erfolgt erfindungsgemäß nach der Formel k(t) = 1 + ΔR(t) / R0. Folgendes Beispiel macht das zugrunde liegende Prinzip deutlich: Kommt der Körper 2 der Druckeinheit 6 mit seiner Oberfläche 3, z.B. aufgrund seiner exzentrischen Positionierung, während der Rotation näher, so erhöht sich die Bahngeschwindigkeit der Oberfläche an der Stelle, an der die Tintentropfen 8 auftreffen sollen, da diese Stellen nun einen größeren Abstand (Radius R(t)) zur Rotationsachse A aufweisen. Daher müssen die Tintentropfen, um eine vorgegebene Auflösung a beizubehalten, mit höherer Frequenz ausgestoßen werden. Entfernt sich die Oberfläche, so verringert sich die Bahngeschwindigkeit und die Frequenz muss entsprechend gesenkt werden.The
Das Berechnen des Korrekturwertes k(t) erfolgt bevorzugt im Wesentlichen kontinuierlich. Hierzu wird kontinuierlich (oder quasikontinuierlich bzw. getaktet mit einer Taktfrequenz in der Größenordnung der Druckfrequenz oder höher) mit dem Entfernungsmesser 9 der Abstand D(t) gemessen und dieser Wert in der Steuereinheit 10 für die Berechnen des Korrekturwertes k(t) und für die Ansteuerung der Druckeinheit 9 mit dem Drucktakt f(t) = f0(t) · k(t) verwendet.The calculation of the correction value k (t) preferably takes place essentially continuously. For this purpose, the distance D (t) is measured continuously (or quasi-continuously or clocked with a clock frequency on the order of the printing frequency or higher) with the
- 11
- Vorrichtungcontraption
- 22
- Körperbody
- 2'2 '
- imaginärer Körperimaginary body
- 33
- Oberflächesurface
- 44
- Abschnittsection
- 55
- Drehtellerturntable
- 66
- Tintenstrahl-DruckeinheitInkjet printing unit
- 77
- Tintenstrahldüseninkjet nozzles
- 88th
- Tintentropfenink drops
- 99
- Entfernungsmesserrangefinder
- 1010
- Steuereinheitcontrol unit
- 1111
- Motorengine
- 1212
- MotorsteuereinheitEngine control unit
- 1313
- DrucksteuereinheitPressure control unit
- AA
- Rotationsachseaxis of rotation
- GG
- GeradeJust
- D(t)D (t)
- Abstanddistance
- D(t)M D (t) M
- mittlerer Abstandaverage distance
- D0 D 0
- Abstanddistance
- R(t)R (t)
- Radiusradius
- ΔR(t).DELTA.R (t)
- Radiusänderungradius change
- R0 R 0
- mittlerer Radiusaverage radius
Claims (8)
dadurch gekennzeichnet,
dass das Bestimmen der Radiusänderung ΔR(t) als berührungsloses Messen mit einem Entfernungsmesser (9) erfolgt, insbesondere mit einem Triangulations-Messgerät.Method according to claim 1,
characterized,
in that the determination of the radius change ΔR (t) takes place as non-contact measurement with a rangefinder (9), in particular with a triangulation measuring device.
dadurch gekennzeichnet,
dass mit dem Entfernungsmesser (9) der Abstand D(t) zwischen den Tintenstrahldüsen (7) und der Oberfläche (3) des Körpers (2) an der Stelle gemessen wird, an der die Tintentropfen auf die Oberfläche treffen sollen, wobei ΔR(t) = D(t)M - D(t) gilt, mit D(t)M als zeitlicher Mittelwert von D(t).Method according to claim 2,
characterized,
in that the distance meter (9) measures the distance D (t) between the ink jet nozzles (7) and the surface (3) of the body (2) at the point where the drops of ink strike the surface, ΔR (t ) = D (t) M - D (t), with D (t) M as the time average of D (t).
dadurch gekennzeichnet,
dass für den zeitlichen Mittelwert D(t)M = D0 - R0 gilt, mit D0 als Abstand zwischen den Tintenstrahldüsen (7) und der Rotationsachse (A).Method according to claim 3,
characterized,
that for the time average D (t) M = D 0 - R 0 , with D 0 as the distance between the ink jet nozzles (7) and the axis of rotation (A).
dadurch gekennzeichnet,
dass das Vorgeben eines mittleren Radius R0 des Körpers (2) auf dem Bestimmen von R0 = D0 - D(t)M beruht, mit D0 als Abstand zwischen den Tintenstrahldüsen (7) und der Rotationsachse (A) und mit D(t)M als zeitlicher Mittelwert von D(t).Method according to one of the preceding claims,
characterized,
that the specification of a mean radius R 0 of the body (2) on the determination of R 0 = D 0 - D (t) M is based, with D 0 as the distance between the ink jet nozzle (7) and the axis of rotation (A) and with D (t) M as the time average of D (t).
gekennzeichnet durch
den weiteren Verfahrensschritt:
marked by
the further process step:
dadurch gekennzeichnet,
dass die Winkelgeschwindigkeit eine Konstante ω0 ist und somit auch die Grundfrequenz eine Konstante f0 ist, wobei f0 = ω0 · R0 / a.Method according to claim 6,
characterized,
that the angular velocity is a constant ω 0 and thus also the fundamental frequency is a constant f 0 , where f 0 = ω 0 · R 0 / a.
dadurch gekennzeichnet,
dass das Berechnen des Korrekturwertes k(t) im Wesentlichen kontinuierlich erfolgt.Method according to one of the preceding claims,
characterized,
in that the calculation of the correction value k (t) takes place substantially continuously.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102013000888.3A DE102013000888A1 (en) | 2013-01-18 | 2013-01-18 | Method for producing a printed image on a rotating, three-dimensional body |
Publications (2)
Publication Number | Publication Date |
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EP2756956A1 true EP2756956A1 (en) | 2014-07-23 |
EP2756956B1 EP2756956B1 (en) | 2015-10-28 |
Family
ID=49759030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13195592.4A Active EP2756956B1 (en) | 2013-01-18 | 2013-12-04 | Method for the generation of a printed image on a rotating, three-dimensional body |
Country Status (5)
Country | Link |
---|---|
US (1) | US8974015B2 (en) |
EP (1) | EP2756956B1 (en) |
JP (1) | JP6226754B2 (en) |
CN (1) | CN103935136B (en) |
DE (1) | DE102013000888A1 (en) |
Cited By (1)
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EP3040205A1 (en) * | 2014-12-09 | 2016-07-06 | Krones AG | Method and device for ink-jet printing on containers |
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US10611136B2 (en) | 2014-07-13 | 2020-04-07 | Stratasys Ltd. | Method and system for rotational 3D printing |
JP6596929B2 (en) * | 2015-05-28 | 2019-10-30 | ブラザー工業株式会社 | Solid object coloring device |
CN107848198B (en) | 2015-07-13 | 2020-08-18 | 斯特拉塔西斯公司 | Method for operating a plurality of printing nozzles in additive manufacturing and device for cleaning a plurality of printing nozzles |
CA3025639C (en) * | 2016-05-30 | 2023-05-02 | Landa Labs (2012) Ltd. | Apparatus for printing on conical objects |
FR3080998B1 (en) * | 2018-05-14 | 2020-04-24 | Reydel Automotive B.V. | PROCESS FOR SURFACE TREATMENT OF A PART AND ASSOCIATED INSTALLATION |
CN109291660B (en) * | 2018-10-23 | 2019-10-15 | 马鞍山市博浪热能科技有限公司 | Ring-pull can production printing mechanism based on digital printing |
CN109572216B (en) * | 2018-12-24 | 2020-01-03 | 北京美科艺数码科技发展有限公司 | Printing method of ink-jet printer |
WO2020209886A1 (en) | 2019-04-08 | 2020-10-15 | LSINC Corporation | Printing system for applying images over a contoured axially symmetric object |
CN114683710B (en) * | 2020-12-25 | 2023-08-15 | 森大(深圳)技术有限公司 | Cylindrical surface printing control method, device, control panel, printer and medium |
CN114953733B (en) * | 2021-02-25 | 2024-03-22 | 深圳市汉森软件股份有限公司 | Rotator surface printing method, rotator surface printing device, rotator surface printing equipment and storage medium |
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Also Published As
Publication number | Publication date |
---|---|
US20140204135A1 (en) | 2014-07-24 |
CN103935136B (en) | 2017-01-18 |
DE102013000888A1 (en) | 2014-07-24 |
US8974015B2 (en) | 2015-03-10 |
JP6226754B2 (en) | 2017-11-08 |
EP2756956B1 (en) | 2015-10-28 |
JP2014136217A (en) | 2014-07-28 |
CN103935136A (en) | 2014-07-23 |
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