EP3530473B1 - Print head adjusting mechanism - Google Patents

Print head adjusting mechanism Download PDF

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Publication number
EP3530473B1
EP3530473B1 EP18158032.5A EP18158032A EP3530473B1 EP 3530473 B1 EP3530473 B1 EP 3530473B1 EP 18158032 A EP18158032 A EP 18158032A EP 3530473 B1 EP3530473 B1 EP 3530473B1
Authority
EP
European Patent Office
Prior art keywords
gears
gear
screw
screws
rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18158032.5A
Other languages
German (de)
French (fr)
Other versions
EP3530473A1 (en
Inventor
Andreas MÜLLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to EP18158032.5A priority Critical patent/EP3530473B1/en
Priority to CN201811598409.2A priority patent/CN110181947B/en
Priority to US16/252,071 priority patent/US10737516B2/en
Priority to JP2019029111A priority patent/JP7206128B2/en
Publication of EP3530473A1 publication Critical patent/EP3530473A1/en
Application granted granted Critical
Publication of EP3530473B1 publication Critical patent/EP3530473B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • 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
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/003—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for changing the angle between a print element array axis and the printing line, e.g. for dot density changes
    • 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
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • 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
    • B41J25/316—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with tilting motion mechanisms relative to 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/34—Bodily-changeable print heads or carriages
    • 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
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/19—Assembling head units
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/20—Modules
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing

Definitions

  • the present invention relates to a device for adjusting print heads of a print bar.
  • Print bars are used for page-wide printing, e.g. B. for inkjet printing.
  • a print bar has a number of print heads that need to be adjusted relative to each other.
  • each module comprises an actuating device for adjusting the modules relative to one another and there is a slide which can be moved to the modules one after the other and has an actuating device for actuating the actuating devices.
  • a first motor rotates a drive spindle which drives the slide.
  • Each module has an adjustment spindle on which an adjustment wheel sits.
  • the object of the invention is to provide an adjustment device which enables a short set-up time.
  • a device for adjusting print heads of a print bar which is characterized in that motors are arranged in a row and are mounted so that they can be moved together, so that each motor carries a gearwheel and that each gear can be brought into engagement with at least two gears in succession.
  • the advantage of the device according to the invention is that it enables a parallel adjustment of several print heads. This saves setup time.
  • the motors sit on a rail, that the at least two gearwheels are arranged in a row of gearwheels, and that the rail is mounted so as to be displaceable parallel to the row of gearwheels.
  • the at least two gearwheels can each be arranged on a screw, the screws being able to be oriented parallel to one another.
  • the screws can each have a cone that forms a push wedge.
  • the screws can have troughs, which together with pressure pieces form the multiple catches.
  • the number of troughs of the multiple detents can preferably match the number of teeth of the at least two gear wheels.
  • each gearwheel carried by the motors has a greater axial toothing length than each of the at least two gearwheels.
  • the print heads are preferably inkjet print heads.
  • Figure 1 shows a printing press 1 with a plurality of identical printing bars 2. Each printing bar 2 prints a different color in the ready-to-use inkjet.
  • Figure 2 shows an example of one of the print bars 2, which has print heads 3 in a row.
  • Each print head 3 has a nozzle plate 4 with nozzles for ejecting the ink.
  • a first screw 5 and a second screw 6 are associated with each print head 3 in order to adjust the print head 3 relative to the adjacent print head 3.
  • Each screw 5, 6 adjusts a different degree of freedom of the print head 3; in the example, the first screw 5 the rotation about the axis z (pressure bar vertical axis) and the second screw 6 the translation along the axis x (pressure bar longitudinal axis).
  • the axis y (print bar transverse axis) of the orthogonal coordinate system is parallel to the substrate transport direction.
  • the screws 5, 6 are identical in construction, which is why only the first screw 5 is described in detail.
  • the screw 5 has a cone 7, against which the print head 3 rests via a button 8. Cone 7 and button 8 together form a thrust wedge gear. If the screw 5 is screwed in deeper, the cone 7 presses the print head 3 in the required direction.
  • the screw 5 has a ring of equally distributed troughs 9 into which a spring-loaded pressure piece 10 engages.
  • the troughs 9 form a multiple detent. So that the pressure piece 10 can snap into the troughs 9 at every screw-in depth of the screw 5, these are designed as grooves which run parallel to the axis of rotation of the screw 5.
  • the screw 5 has a gear 11, the number of teeth of which corresponds to the number of troughs 9.
  • the multiple detent ensures that the screw 5 stops during gradual rotation only in those angular positions that correspond to tooth engagement positions of the gear 11.
  • the gearwheel 11 can sit on a shaft of the screw 5 or can be molded onto the screw 5 as a screw head.
  • the multiple detent could be formed by the gear 11 together with the pressure piece 10, which engages in the tooth gaps of the gear 11. This would save space.
  • Motors 13 are fastened to a traverse or rail 12 in a row which runs parallel to the row of screws 5, 6.
  • the rail 12 is in the row with screws 5, 6 parallel, that is parallel to the axis x, preferably by a drive 14, z. B. a pneumatic cylinder, slidably mounted.
  • the rail 12 or row of motors 13 could be manually displaceable parallel to the axis x.
  • Each motor 13 is used to drive the two screws 5, 6 of another printhead 3. With advantageously only one motor 13 per printhead 3, this is adjusted with respect to both degrees of freedom.
  • a gear 15 and a locking disc 16 are seated, in the recesses of which a spring-loaded pressure piece 17 engages.
  • the locking disc 16 and the pressure piece 17 together form a multiple locking.
  • the number of teeth of the gear wheel 15 corresponds to the number of troughs of the locking disc 16.
  • the multiple locking could be formed by the gear wheel 15 together with the pressure piece 17, the latter locking into the tooth gaps of the gear wheel 15. This would save space.
  • the multiple detent could be completely omitted if the rotational position of the motor 13 is detected and controlled for the correct tooth engagement.
  • the toothing length of the gear wheel 15 is extended so that when the screw 5 is screwed in, despite the axial movement of the gear wheel 11 to be driven, it does not come out of engagement with the gear wheel 15.
  • the gear 15 is designed as a toothed shaft.
  • the gear wheels 11 could be designed as toothed shafts.
  • the axis of rotation of the gear 15 is oriented parallel to the axis of rotation of the gears 11 of the screws 5, 6.
  • the gears 11, 15 are spur gears with straight teeth.
  • Figure 3a shows a central neutral position of the gear 15, in which there is enough air or play between it and the two adjacent gears 11 in order to be able to handle the print head 3 without risk of collision for the gears 11 when the print head 3 is inserted into the print bar 2.
  • the gear 15 In the neutral position, the gear 15 is not in engagement with any gear 11 and the multiple catches of the screws 5, 6 and the gear 15 ensure that the gear 15 with respect to the gears 11 of both screws 5, 6 is in a ready-to-engage gap-tooth rotation angle position stands.
  • Figure 3b shows the gear 15 moved to a position with engagement in the gear 11 of the screw 6 to the right and Figure 3c shows the gear 15 in an opposite position with engagement in the gear 11 of the other screw 5 shifted to the left, wherein in these two positions the motor 13 drives a screw 5 and 6, respectively. By moving the motor 13 with its gear 15, this is brought into engagement with the two gears 11 one after the other in the radial direction.
  • the motors 13 can operate in parallel in order to first adjust all printheads 3 with respect to one degree of freedom and then with respect to the other.
  • the motors 13 can be controlled individually, for. B. if a print head 3 must be adjusted by a different amount than another print head 3 with respect to the axis x.
  • Figure 4 shows a modification in which three or more gears 11 are successively driven by one or more print heads 3 by a common motor with a gear 15.
  • the gear 15 is adjusted with the rail along a line L that runs parallel to a common tangent of the gears 11.
  • the gear 15 rotates. If the distance a between the axes of rotation of the gear 11 corresponds to a multiple of the tooth spacing of the teeth of the gear 11, the gear 15 moves as if it were rolls on a virtual rack. If the distance a is not a multiple, the gear wheel 15 does not rotate during its entire translation, but only in the areas of the toothing of the gear wheels 11 and the motor of the gear wheel 15 is controlled accordingly.

Landscapes

  • Ink Jet (AREA)
  • Common Mechanisms (AREA)

Description

Vorliegende Erfindung betrifft eine Vorrichtung zur Justage von Druckköpfen eines Druckbalkens.The present invention relates to a device for adjusting print heads of a print bar.

Druckbalken werden für den seitenbreiten Druck eingesetzt, z. B. für den Inkjet-Druck. Typischerweise weist ein Druckbalken eine Reihe von Druckköpfen auf, die relativ zueinander justiert werden müssen.Print bars are used for page-wide printing, e.g. B. for inkjet printing. Typically, a print bar has a number of print heads that need to be adjusted relative to each other.

In DE 10 2016 209 945 A1 wird für den Druckbalken und die Druckköpfe eine andere Terminologie verwendet. Dort ist der Druckbalken als Druckkopf bezeichnet und sind die Druckköpfe als Module bezeichnet. Jedes Modul umfasst eine Stelleinrichtung zum Justieren der Module relativ zueinander und es ist ein Schlitten vorhanden, welcher zu den Modulen nacheinander verfahrbar ist und eine Betätigungseinrichtung zur Betätigung der Stelleinrichtungen hat. Um den Schlitten von einem zum anderen Modul zu verfahren, dreht ein erster Motor eine Antriebsspindel, welche den Schlitten antreibt. Jedes Modul hat eine Justagespindel, auf der ein Justagerad sitzt. Durch das Verstellen des Schlittens in Gegenüberlage mit einem zu justierenden Modul wird das Antriebsrad im Zahneingriff mit dem Justagerad gebracht. Bei Zahneingriff kann das Antriebsrad das Justagerad antreiben, um das Modul zu justieren. Von Nachteil ist die lange Rüstzeit, welche für die Justage aller Module erforderlich ist. Da alle Module nacheinander durch einen einzigen, gemeinsamen Schlitten justiert werden, dauert die Justage insgesamt sehr lange.In DE 10 2016 209 945 A1 a different terminology is used for the print bar and the print heads. There the print bar is referred to as a print head and the print heads are referred to as modules. Each module comprises an actuating device for adjusting the modules relative to one another and there is a slide which can be moved to the modules one after the other and has an actuating device for actuating the actuating devices. In order to move the slide from one module to the other, a first motor rotates a drive spindle which drives the slide. Each module has an adjustment spindle on which an adjustment wheel sits. By adjusting the slide in relation to a module to be adjusted, the drive wheel is brought into mesh with the adjustment wheel. When meshing, the drive wheel can drive the adjustment wheel in order to adjust the module. A disadvantage is the long set-up time, which is necessary for the adjustment of all modules. Since all modules are adjusted one after the other by a single, common slide, the adjustment takes a very long time overall.

Aufgabe der Erfindung ist, eine Justagevorrichtung zu schaffen, die eine kurze Rüstzeit ermöglicht.The object of the invention is to provide an adjustment device which enables a short set-up time.

Diese Aufgabe wird durch eine Vorrichtung zur Justage von Druckköpfen eines Druckbalkens gelöst, welche dadurch gekennzeichnet ist, dass Motore in einer Reihe angeordnet und gemeinsam verschiebbar gelagert sind, dass jeder Motor ein Zahnrad trägt und dass jedes Zahnrad nacheinander mit jeweils mindestens zwei Zahnrädern in Eingriff bringbar ist.This object is achieved by a device for adjusting print heads of a print bar, which is characterized in that motors are arranged in a row and are mounted so that they can be moved together, so that each motor carries a gearwheel and that each gear can be brought into engagement with at least two gears in succession.

Vorteil der erfindungsgemäßen Vorrichtung ist, dass mit dieser eine zeitlich parallel erfolgende Justage von mehreren Druckköpfen möglich ist. Dadurch wird Rüstzeit eingespart.The advantage of the device according to the invention is that it enables a parallel adjustment of several print heads. This saves setup time.

Es sind verschiedene Weiterbildungen möglich:
Es kann vorgesehen sein, dass die Motore auf einer Schiene sitzen, dass die mindestens zwei Zahnräder in einer Reihe von Zahnrädern angeordnet sind und dass die Schiene relativ zu der Reihe von Zahnrädern parallel verschiebbar gelagert ist.
Es kann ein Antrieb zum Verschieben der Schiene vorhanden sein.
Die mindestens zwei Zahnräder können jeweils an einer Schraube angeordnet sein, wobei die Schrauben miteinander parallel orientiert sein können.
Die Schrauben können jeweils einen Konus aufweisen, der einen Schubkeil bildet.
Es können Mehrfachrastungen zum Sichern von Drehwinkelpositionen der mindestens zwei Zahnräder vorhanden sein.
Hierbei können die Schrauben Mulden aufweisen, welche zusammen mit Druckstücken die Mehrfachrastungen bilden.
Vorzugsweise kann die Anzahl der Mulden der Mehrfachrastungen mit der Anzahl der Zähne der mindestens zwei Zahnräder übereinstimmen.
Bei einer weiteren Weiterbildung weist jedes von den Motoren getragene Zahnrad eine größere axiale Verzahnungslänge als jedes der mindestens zwei Zahnräder auf. Vorzugsweise sind die Druckköpfe Inkjet-Druckköpfe.Various further training courses are possible:
It can be provided that the motors sit on a rail, that the at least two gearwheels are arranged in a row of gearwheels, and that the rail is mounted so as to be displaceable parallel to the row of gearwheels.
There may be a drive for moving the rail.
The at least two gearwheels can each be arranged on a screw, the screws being able to be oriented parallel to one another.
The screws can each have a cone that forms a push wedge.
There can be multiple detents for securing rotational angle positions of the at least two gear wheels.
Here, the screws can have troughs, which together with pressure pieces form the multiple catches.
The number of troughs of the multiple detents can preferably match the number of teeth of the at least two gear wheels.
In a further development, each gearwheel carried by the motors has a greater axial toothing length than each of the at least two gearwheels. The print heads are preferably inkjet print heads.

Weiterbildungen ergeben sich auch aus der nachfolgenden Beschreibung eines Ausführungsbeispiels und der zugehörigen Zeichnung, in welcher zeigt:

Figur 1:
eine Druckmaschine in Gesamtdarstellung,
Figur 2:
ein Druckbalken der Druckmaschine mit einer Justagevorrichtung in Seitenansicht,
Figuren 3a, 3b und 3c:
verschiedene Relativstellungen von Zahnrädern der Justagevorrichtung in Draufsicht und
Figur 4:
eine Modifikation der Justagevorrichtung.
Further developments also result from the following description of an exemplary embodiment and the associated drawing, in which:
Figure 1:
an overall printing press,
Figure 2:
a pressure bar of the printing press with an adjustment device in side view,
Figures 3a, 3b and 3c:
different relative positions of gears of the adjustment device in plan view and
Figure 4:
a modification of the adjustment device.

In den Figuren 1 bis 4 sind einander entsprechende Bauteile mit den gleichen Bezugszeichen bezeichnet.In the Figures 1 to 4 Corresponding components are designated by the same reference numerals.

Figur 1 zeigt eine Druckmaschine 1 mit mehreren baugleichen Druckbalken 2. Jeder Druckbalken 2 druckt im seitenbereiten Inkjet eine andere Farbe. Figure 1 shows a printing press 1 with a plurality of identical printing bars 2. Each printing bar 2 prints a different color in the ready-to-use inkjet.

Figur 2 zeigt beispielhaft einen der Druckbalken 2, der Druckköpfe 3 in einer Reihe aufweist. Jeder Druckkopf 3 hat eine Düsenplatte 4 mit Düsen zum Ausstoßen der Tinte. Jedem Druckkopf 3 sind eine erste Schraube 5 und zweite Schraube 6 beigeordnet, um den Druckkopf 3 relativ zum benachbarten Druckkopf 3 zu justieren. Jede Schraube 5, 6 justiert einen anderen Freiheitsgrad des Druckkopfs 3; im Beispiel die erste Schraube 5 die Rotation um die Achse z (Druckbalken-Hochachse) und die zweite Schraube 6 die Translation entlang der Achse x (Druckbalken-Längsachse). Die Achse y (Druckbalken-Querachse) des orthogonalen Koordinatensystems ist parallel mit der Bedruckstofftransportrichtung. Figure 2 shows an example of one of the print bars 2, which has print heads 3 in a row. Each print head 3 has a nozzle plate 4 with nozzles for ejecting the ink. A first screw 5 and a second screw 6 are associated with each print head 3 in order to adjust the print head 3 relative to the adjacent print head 3. Each screw 5, 6 adjusts a different degree of freedom of the print head 3; in the example, the first screw 5 the rotation about the axis z (pressure bar vertical axis) and the second screw 6 the translation along the axis x (pressure bar longitudinal axis). The axis y (print bar transverse axis) of the orthogonal coordinate system is parallel to the substrate transport direction.

Die Schrauben 5, 6 sind baugleich, weshalb nur die erste Schraube 5 im Detail beschrieben wird. Die Schraube 5 hat einen Konus 7, an dem der Druckkopf 3 über einen Taster 8 anliegt. Konus 7 und Taster 8 bilden zusammen ein Schubkeilgetriebe. Wird die Schraube 5 tiefer eingeschraubt, drückt der Konus 7 den Druckkopf 3 in die erforderliche Richtung. Die Schraube 5 hat rundum einen Kranz von gleichverteilten Mulden 9, in die ein gefedertes Druckstück 10 einrastet. Die Mulden 9 bilden eine Mehrfachrastung. Damit das Druckstück 10 bei jeder Einschraubtiefe der Schraube 5 in die Mulden 9 einrasten kann, sind diese als Nuten ausgebildet, die mit der Rotationsachse der Schraube 5 parallel verlaufen.The screws 5, 6 are identical in construction, which is why only the first screw 5 is described in detail. The screw 5 has a cone 7, against which the print head 3 rests via a button 8. Cone 7 and button 8 together form a thrust wedge gear. If the screw 5 is screwed in deeper, the cone 7 presses the print head 3 in the required direction. The screw 5 has a ring of equally distributed troughs 9 into which a spring-loaded pressure piece 10 engages. The troughs 9 form a multiple detent. So that the pressure piece 10 can snap into the troughs 9 at every screw-in depth of the screw 5, these are designed as grooves which run parallel to the axis of rotation of the screw 5.

Außerdem hat die Schraube 5 ein Zahnrad 11, dessen Zähneanzahl der Anzahl der Mulden 9 entspricht. Dadurch sichert die Mehrfachrastung, dass die Schraube 5 beim schrittweisen Drehen nur in solchen Winkelpositionen stehenbleibt, die mit Zahneingriffspositionen des Zahnrads 11 korrespondieren. Das Zahnrad 11 kann auf einem Schaft der Schraube 5 sitzen oder an die Schraube 5 als Schraubenkopf angeformt sein. Alternativ könnte bei Entfall des Kranzes von Mulden 9 die Mehrfachrastung durch das Zahnrad 11 zusammen mit dem Druckstück 10 gebildet sein, wobei dieses in die Zahnlücken des Zahnrads 11 einrastet. Dies wäre bauraumsparend.In addition, the screw 5 has a gear 11, the number of teeth of which corresponds to the number of troughs 9. As a result, the multiple detent ensures that the screw 5 stops during gradual rotation only in those angular positions that correspond to tooth engagement positions of the gear 11. The gearwheel 11 can sit on a shaft of the screw 5 or can be molded onto the screw 5 as a screw head. Alternatively, if the ring of troughs 9 is omitted, the multiple detent could be formed by the gear 11 together with the pressure piece 10, which engages in the tooth gaps of the gear 11. This would save space.

An einer Traverse oder Schiene 12 sind Motore 13 in einer Reihe befestigt, die parallel mit der Reihe von Schrauben 5, 6 verläuft. Die Schiene 12 ist in mit der Reihe von Schrauben 5, 6 paralleler Richtung, also parallel mit der Achse x, vorzugsweise durch einen Antrieb 14, z. B. einen Pneumatikzylinder, verschiebbar gelagert. Alternativ könnte bei Entfall des Antriebs 14 die Schiene 12 oder Reihe von Motoren 13 parallel mit der Achse x manuell verschiebbar sein. Jeder Motor 13 dient zum Antreiben der beiden Schrauben 5, 6 eines anderen Druckkopfs 3. Mit vorteilhafterweise nur einem Motor 13 pro Druckkopf 3 wird dieser also bezüglich beider Freiheitsgrade justiert.Motors 13 are fastened to a traverse or rail 12 in a row which runs parallel to the row of screws 5, 6. The rail 12 is in the row with screws 5, 6 parallel, that is parallel to the axis x, preferably by a drive 14, z. B. a pneumatic cylinder, slidably mounted. Alternatively, if the drive 14 is omitted, the rail 12 or row of motors 13 could be manually displaceable parallel to the axis x. Each motor 13 is used to drive the two screws 5, 6 of another printhead 3. With advantageously only one motor 13 per printhead 3, this is adjusted with respect to both degrees of freedom.

Auf einer Welle des Motors 13 sitzen ein Zahnrad 15 und eine Rastscheibe 16, in deren Mulden ein gefedertes Druckstück 17 einrastet. Die Rastscheibe 16 und das Druckstück 17 bilden zusammen eine Mehrfachrastung. Die Zähneanzahl der Zahnrads 15 entspricht der Muldenanzahl der Rastscheibe 16. Alternativ könnte bei Entfall der Rastscheibe 16 die Mehrfachrastung durch das Zahnrad 15 zusammen mit dem Druckstück 17 gebildet sein, wobei letzteres in die Zahnlücken des Zahnrads 15 einrastet. Dies wäre bauraumsparend. Die Mehrfachrastung könnte komplett entfallen, wenn für den korrekten Zahneingriff die Drehlage des Motors 13 erfasst und geregelt wird.On a shaft of the motor 13, a gear 15 and a locking disc 16 are seated, in the recesses of which a spring-loaded pressure piece 17 engages. The locking disc 16 and the pressure piece 17 together form a multiple locking. The number of teeth of the gear wheel 15 corresponds to the number of troughs of the locking disc 16. Alternatively, if the locking disc 16 is omitted, the multiple locking could be formed by the gear wheel 15 together with the pressure piece 17, the latter locking into the tooth gaps of the gear wheel 15. This would save space. The multiple detent could be completely omitted if the rotational position of the motor 13 is detected and controlled for the correct tooth engagement.

Die Verzahnungslänge des Zahnrads 15 ist verlängert, sodass beim Einschrauben der Schraube 5 trotz der axialen Bewegung des anzutreibenden Zahnrads 11 dieses nicht außer Eingriff in das Zahnrad 15 kommt. Vorzugsweise ist also das Zahnrad 15 als Zahnwelle ausgebildet. Alternativ könnten bei normaler Verzahnungslänge des Zahnrads 15 die Zahnräder 11 als Zahnwellen ausgebildet sein. Die Rotationsachse des Zahnrads 15 ist parallel mit der Rotationsachse der Zahnräder 11 der Schrauben 5, 6 orientiert. Die Zahnräder 11, 15 sind Stirnräder mit Geradverzahnung.The toothing length of the gear wheel 15 is extended so that when the screw 5 is screwed in, despite the axial movement of the gear wheel 11 to be driven, it does not come out of engagement with the gear wheel 15. Preferably, the gear 15 is designed as a toothed shaft. Alternatively, with normal tooth length of the gear wheel 15, the gear wheels 11 could be designed as toothed shafts. The axis of rotation of the gear 15 is oriented parallel to the axis of rotation of the gears 11 of the screws 5, 6. The gears 11, 15 are spur gears with straight teeth.

In den Figuren 3a bis 3c sind verschiedene Positionen des Zahnrads 15 relativ zu den Zahnrädern 11 der Schrauben 5, 6 gezeigt, wobei diese Positionen durch das Verschieben der Schiene12 eingestellt werden. Die Rotationsachsen oder Mittelpunkte aller Zahnräder 11, 15 des Druckbalkens 2 und der Justiervorrichtung liegen auf einer gemeinsamen, geraden Linie. Es ist egal, ob das Motorzahnrad 15 kleiner (wie in Fig. 3a - 3c) oder größer als die Schraubenzahnräder 11 im Durchmesser ist oder gleichgroß (wie in Fig. 2) ist.In the Figures 3a to 3c Various positions of the gear wheel 15 are shown relative to the gear wheels 11 of the screws 5, 6, these positions being set by moving the rail 12. The axes of rotation or centers of all gears 11, 15 of the pressure beam 2 and the adjusting device lie on a common, straight line. It does not matter whether the motor gear 15 is smaller (as in 3a-3c ) or larger than the screw gears 11 in diameter or the same size (as in Fig. 2 ) is.

Figur 3a zeigt eine mittlere Neutralposition des Zahnrads 15, in der zwischen diesem und den beiden benachbarten Zahnrädern 11 jeweils genug Luft oder Spiel vorhanden ist, um beim Einsetzen des Druckkopfs 3 in den Druckbalken 2 den Druckkopf 3 ohne Kollisionsgefahr für die Zahnräder 11 handhaben zu können. In der Neutralposition ist das Zahnrad 15 mit keinem Zahnrad 11 in Eingriff und ist durch die Mehrfachrastungen der Schrauben 5, 6 und des Zahnrads 15 sichergestellt, dass das Zahnrad 15 bezüglich der Zahnräder 11 beider Schrauben 5, 6 in einer eingriffsbereiten Lücke-Zahn-Drehwinkelposition steht. Figure 3a shows a central neutral position of the gear 15, in which there is enough air or play between it and the two adjacent gears 11 in order to be able to handle the print head 3 without risk of collision for the gears 11 when the print head 3 is inserted into the print bar 2. In the neutral position, the gear 15 is not in engagement with any gear 11 and the multiple catches of the screws 5, 6 and the gear 15 ensure that the gear 15 with respect to the gears 11 of both screws 5, 6 is in a ready-to-engage gap-tooth rotation angle position stands.

Figur 3b zeigt das Zahnrad 15 in eine Position mit Eingriff in das Zahnrad 11 der Schraube 6 nach rechts verschoben und Figur 3c zeigt das Zahnrad 15 in eine entgegengesetzte Position mit Eingriff in das Zahnrad 11 der anderen Schraube 5 nach links verschoben, wobei in diesen beiden Positionen der Motor 13 jeweils eine Schraube 5 bzw. 6 antreibt. Durch das Verschieben des Motors 13 mit seinem Zahnrad 15 wird dieses in Radialrichtung nacheinander mit den beiden Zahnrädern 11 in Eingriff gebracht. Figure 3b shows the gear 15 moved to a position with engagement in the gear 11 of the screw 6 to the right and Figure 3c shows the gear 15 in an opposite position with engagement in the gear 11 of the other screw 5 shifted to the left, wherein in these two positions the motor 13 drives a screw 5 and 6, respectively. By moving the motor 13 with its gear 15, this is brought into engagement with the two gears 11 one after the other in the radial direction.

Die Motore 13 können im Parallelbetrieb arbeiten, um alle Druckköpfe 3 zuerst bezüglich des einen Freiheitsgrads zu justieren und danach bezüglich des anderen. Hierbei können die Motore 13 individuell angesteuert werden, z. B. wenn ein Druckkopf 3 um ein anderes Maß als ein anderer Druckkopf 3 bezüglich der Achse x justiert werden muss.The motors 13 can operate in parallel in order to first adjust all printheads 3 with respect to one degree of freedom and then with respect to the other. Here, the motors 13 can be controlled individually, for. B. if a print head 3 must be adjusted by a different amount than another print head 3 with respect to the axis x.

Figur 4 zeigt eine Modifikation, bei welcher drei oder mehr Zahnräder 11 von einem oder mehreren Druckköpfen 3 durch einen gemeinsamen Motor mit einem Zahnrad 15 nacheinander angetrieben werden. Hierbei wird das Zahnrad 15 mit der Schiene entlang einer Linie L verstellt, die parallel mit einer gemeinsamen Tangente der Zahnräder 11 verläuft. Beim Verfahren des Zahnrads 15 entlang der Linie L von einem zum anderen Zahnrad 11 rotiert das Zahnrad 15. Wenn der Abstand a zwischen den Rotationsachsen der Zahnräder 11 einem Vielfachen des Zahnabstands der Zähne des Zahnrads 11 entspricht, bewegt sich das Zahnrad 15, als ob es auf einer virtuellen Zahnstange abwälzt. Beträgt der Abstand a nicht besagtes Vielfaches, rotiert das Zahnrad 15 nicht während seiner gesamten Translation, sondern nur in den Bereichen der Verzahnungen der Zahnräder 11 und wird der Motor des Zahnrads 15 dementsprechend angesteuert. Figure 4 shows a modification in which three or more gears 11 are successively driven by one or more print heads 3 by a common motor with a gear 15. Here, the gear 15 is adjusted with the rail along a line L that runs parallel to a common tangent of the gears 11. When the gear 15 moves along the line L from one gear 11 to the other, the gear 15 rotates. If the distance a between the axes of rotation of the gear 11 corresponds to a multiple of the tooth spacing of the teeth of the gear 11, the gear 15 moves as if it were rolls on a virtual rack. If the distance a is not a multiple, the gear wheel 15 does not rotate during its entire translation, but only in the areas of the toothing of the gear wheels 11 and the motor of the gear wheel 15 is controlled accordingly.

BezugszeichenlisteReference list

11
DruckmaschinePrinting press
22nd
DruckbalkenPressure bar
33rd
DruckkopfPrinthead
44th
DüsenplatteNozzle plate
55
erste Schraubefirst screw
66
zweite Schraubesecond screw
77
Konuscone
88th
TasterButton
99
Muldetrough
1010th
DruckstückPressure piece
1111
Zahnradgear
1212th
Schienerail
1313
Motorengine
1414
Antriebdrive
1515
Zahnradgear
1616
--
1717th
DruckstückPressure piece
aa
Abstanddistance
LL
Linieline
xx
Achseaxis
yy
Achseaxis
ze.g.
Achseaxis

Claims (10)

  1. Device for adjusting printing heads (3) of a printing bar (2),
    characterized
    in that motors (13) are disposed in a row and supported for joint movement,
    in that every motor (13) carries a gear (15) and
    in that every gear (15) is successively engageable with at least two respective gears (11).
  2. Device according to claim 1,
    characterized
    in that the motors (13) sit on a rail (12),
    in that the at least two gears (11) are disposed in a row of gears (11) and
    in that the rail (12) is supported for parallel movement relative to the row of gears (11).
  3. Device according to claim 2,
    characterized
    in that a drive (14) for moving the rail (12) is provided.
  4. Device according to any one of claims 1 to 3,
    characterized
    in that every one of the at least two gears (11) is disposed on a screw (5, 6), wherein the screws (5, 6) are oriented to be parallel with one another.
  5. Device according to claim 4,
    characterized
    in that each one of the screws (5, 6) has a cone (7) that forms a push wedge.
  6. Device according to claim 4 or 5,
    characterized
    in that multiple ratchet mechanisms are provided to secure angular positions of the at least two gears (11).
  7. Device according to claim 6,
    characterized
    in that the screws (5, 6) have depressions (9) that form said multiple ratchet mechanisms together with pressure pieces (10).
  8. Device according to claim 7,
    characterized
    in that the number of the depressions (9) of the multiple ratchet mechanisms matches the number of teeth of the at least two gears (11).
  9. Device according to any one of claims 1 to 8,
    characterized
    in that every one of the gears (15) carried by the motors (13) has a greater axial toothing length than every one of the at least two gears (11)
  10. Device according to any one of claims 1 to 9,
    characterized
    in that the printing heads (3) are inkjet printing heads.
EP18158032.5A 2018-02-22 2018-02-22 Print head adjusting mechanism Active EP3530473B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18158032.5A EP3530473B1 (en) 2018-02-22 2018-02-22 Print head adjusting mechanism
CN201811598409.2A CN110181947B (en) 2018-02-22 2018-12-26 Print head adjusting device
US16/252,071 US10737516B2 (en) 2018-02-22 2019-01-18 Print head adjustment device
JP2019029111A JP7206128B2 (en) 2018-02-22 2019-02-21 print head adjuster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18158032.5A EP3530473B1 (en) 2018-02-22 2018-02-22 Print head adjusting mechanism

Publications (2)

Publication Number Publication Date
EP3530473A1 EP3530473A1 (en) 2019-08-28
EP3530473B1 true EP3530473B1 (en) 2020-07-15

Family

ID=61256771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18158032.5A Active EP3530473B1 (en) 2018-02-22 2018-02-22 Print head adjusting mechanism

Country Status (4)

Country Link
US (1) US10737516B2 (en)
EP (1) EP3530473B1 (en)
JP (1) JP7206128B2 (en)
CN (1) CN110181947B (en)

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DE102023107319B3 (en) 2023-03-23 2024-02-15 Heidelberger Druckmaschinen Aktiengesellschaft Device for adjusting a print head

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Also Published As

Publication number Publication date
US20190255867A1 (en) 2019-08-22
CN110181947A (en) 2019-08-30
EP3530473A1 (en) 2019-08-28
US10737516B2 (en) 2020-08-11
JP2019142224A (en) 2019-08-29
JP7206128B2 (en) 2023-01-17
CN110181947B (en) 2021-03-12

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