EP3530473A1 - Print head adjusting mechanism - Google Patents

Print head adjusting mechanism Download PDF

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Publication number
EP3530473A1
EP3530473A1 EP18158032.5A EP18158032A EP3530473A1 EP 3530473 A1 EP3530473 A1 EP 3530473A1 EP 18158032 A EP18158032 A EP 18158032A EP 3530473 A1 EP3530473 A1 EP 3530473A1
Authority
EP
European Patent Office
Prior art keywords
gear
gears
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.)
Granted
Application number
EP18158032.5A
Other languages
German (de)
French (fr)
Other versions
EP3530473B1 (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 printheads of a printing bar.
  • Pressure bars are used for page-wide printing, eg. B. for inkjet printing.
  • a pressure bar has a series of printheads that need to be adjusted relative to each other.
  • each module comprises an adjusting device for adjusting the modules relative to each other and there is a carriage, which is movable in succession to the modules and has an actuating device for actuating the actuating devices.
  • a first motor rotates a drive spindle which drives the carriage.
  • Each module has an adjustment spindle on which a Justagerad sits. By adjusting the carriage in opposition to a module to be adjusted, the drive wheel is brought into meshing engagement with the Justagerad.
  • the drive wheel When meshed, the drive wheel can drive the adjustment wheel to adjust the module.
  • a disadvantage is the long set-up time, which is required 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.
  • the object of the invention is to provide an adjustment device that allows a short set-up time.
  • a device for adjusting printheads of a pressure beam which is characterized in that motors are arranged in a row and mounted together displaceable, that each motor carries a gear and that each gear is successively engageable with at least two gears in each case.
  • Advantage of the device according to the invention is that with this a temporally parallel adjustment of several print heads is possible. This saves set-up time.
  • FIGS. 1 to 4 are mutually corresponding components designated by the same reference numerals.
  • FIG. 1 shows a printing machine 1 with several identical pressure bar 2. Each print bar 2 prints in the page-ready inkjet another color.
  • FIG. 2 shows an example of the pressure bar 2, the printheads 3 in a row.
  • Each print head 3 has a nozzle plate 4 with nozzles for ejecting the ink.
  • Each printhead 3 has a first screw 5 and second screw 6 associated therewith to adjust the printhead 3 relative to the adjacent printhead 3.
  • Each screw 5, 6 adjusts another degree of freedom of the printhead 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 (pressure bar transverse axis) of the orthogonal coordinate system is parallel to the printing material transport direction.
  • the screws 5, 6 are identical, which is why only the first screw 5 is described in detail.
  • the screw 5 has a cone 7, on 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 deeper, the cone 7 presses the print head 3 in the required direction.
  • the screw 5 has all around a ring of equally distributed wells 9, in which a spring-loaded pressure piece 10 engages.
  • the troughs 9 form a multiple catch.
  • the pressure piece 10 can engage in each screwing depth of the screw 5 in the troughs 9, these are formed as grooves which extend parallel to the axis of rotation of the screw 5.
  • the screw 5 has a gear 11 whose number of teeth corresponds to the number of wells 9.
  • the multiple catch ensures that the screw 5 stops in stepwise rotation only in those angular positions corresponding to tooth engagement positions of the gear 11.
  • the gear 11 can sit on a shaft of the screw 5 or be formed on the screw 5 as a screw head.
  • the multiple catch could be formed by the gear 11 together with the pressure piece 10, wherein this engages in the tooth gaps of the gear 11. This would save space.
  • motors 13 are mounted in a row which is parallel with the row of screws 5, 6.
  • the rail 12 is in parallel with the row of screws 5, 6 parallel direction, ie parallel to the axis x, preferably by a drive 14, for. B. a pneumatic cylinder, slidably mounted.
  • a drive 14 for. B. a pneumatic cylinder, slidably mounted.
  • the rail 12 or series 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 thus adjusted with respect to both degrees of freedom.
  • a gear 15 and a locking disc 16 On a shaft of the motor 13 sit a gear 15 and a locking disc 16, in which wells a spring-loaded pressure piece 17 engages.
  • the locking disk 16 and the pressure piece 17 together form a multiple catch.
  • the number of teeth of the gear 15 corresponds to the number of troughs of the locking disk 16.
  • 16 could be formed by the gear 15 together with the pressure piece 17 in the absence of the locking disc 16, the latter engages in the tooth gaps of the gear 15. This would save space.
  • the multiple catch could be completely eliminated if the rotational position of the motor 13 is detected and regulated for the correct meshing.
  • the tooth length of the gear 15 is extended, so that when screwing the screw 5 despite the axial movement of the driven gear 11, this is not disengaged from the gear 15.
  • the gear 15 is formed as a toothed shaft.
  • the gears 11 could be formed as splines at normal Vernierungswin of the gear 15.
  • 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.
  • FIGS. 3a to 3c For example, various positions of the gear 15 relative to the gears 11 of the screws 5, 6 are shown, these positions being adjusted by the displacement of the rail 12.
  • the axes of rotation or centers of all gears 11, 15 of the pressure bar 2 and the adjusting device lie on a common, straight line. It does not matter if the motor gear 15 is smaller (as in Fig. 3a - 3c ) or larger than the helical gears 11 in diameter or the same size (as in Fig. 2 ).
  • FIG. 3a shows a mean neutral position of the gear 15, in which there is enough air or clearance between this and the two adjacent gears 11 to handle the printhead 3 without collision hazard for the gears 11 when inserting the print head 3 in the pressure bar 2.
  • the gear 15 In the neutral position, the gear 15 is engaged with no gear 11 and is ensured by the multiple notches of the screws 5, 6 and the gear 15, that the gear 15 with respect to the gears 11 of both screws 5, 6 in an operable gap-tooth rotational angular position stands.
  • FIG. 3b shows the gear 15 is moved to a position with engagement with the gear 11 of the screw 6 to the right and
  • Figure 3c shows the gear 15 is displaced in an opposite position with engagement in the gear 11 of the other screw 5 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 in succession in the radial direction with the two gears 11 into engagement.
  • the motors 13 may operate in parallel to adjust all the printheads 3 first with respect to one degree of freedom and then with respect to the other.
  • the motors 13 can be controlled individually, z. B. when a print head 3 by a different level than another print head 3 with respect to the axis x must be adjusted.
  • FIG. 4 shows a modification in which three or more gears 11 are driven by one or more print heads 3 by a common motor with a gear 15 in succession.
  • the gear 15 is adjusted with the rail along a line L, which runs parallel to a common tangent of the gears 11.
  • the gear 15 rotates the gear 15. If the distance a between the axes of rotation of the gears 11 is a multiple of the tooth spacing of the teeth of the gear 11, the gear 15 moves as if rolling on a virtual rack. If the distance a is not said multiple, the gear 15 does not rotate during its entire translation, but only in the areas of the teeth of the gears 11 and the motor of the gear 15 is driven accordingly.

Landscapes

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

Abstract

Bei einer Vorrichtung zur Justage von Druckköpfen (3) eines Druckbalkens (2) sind Motore (13) in einer Reihe angeordnet und gemeinsam verschiebbar gelagert. Jeder Motor (13) trägt ein Zahnrad (15) und jedes Zahnrad (15) ist nacheinander mit jeweils mindestens zwei Zahnrädern (11) in Eingriff bringbar.In a device for adjusting printheads (3) of a pressure bar (2), motors (13) are arranged in a row and mounted so as to be displaceable together. Each motor (13) carries a gear (15) and each gear (15) is sequentially engageable with at least two gears (11).

Description

Vorliegende Erfindung betrifft eine Vorrichtung zur Justage von Druckköpfen eines Druckbalkens.The present invention relates to a device for adjusting printheads of a printing 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.Pressure bars are used for page-wide printing, eg. B. for inkjet printing. Typically, a pressure bar has a series of printheads 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 For the print bar and printheads, a different terminology is used. There, the print bar is referred to as a printhead and the printheads are referred to as modules. Each module comprises an adjusting device for adjusting the modules relative to each other and there is a carriage, which is movable in succession to the modules and has an actuating device for actuating the actuating devices. To move the carriage from one module to another, a first motor rotates a drive spindle which drives the carriage. Each module has an adjustment spindle on which a Justagerad sits. By adjusting the carriage in opposition to a module to be adjusted, the drive wheel is brought into meshing engagement with the Justagerad. When meshed, the drive wheel can drive the adjustment wheel to adjust the module. A disadvantage is the long set-up time, which is required 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 that allows 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 printheads of a pressure beam, which is characterized in that motors are arranged in a row and mounted together displaceable, that each motor carries a gear and that each gear is successively engageable with at least two gears in each case.

Vorteil der erfindungsgemäßen Vorrichtung ist, dass mit dieser eine zeitlich parallel erfolgende Justage von mehreren Druckköpfen möglich ist. Dadurch wird Rüstzeit eingespart.Advantage of the device according to the invention is that with this a temporally parallel adjustment of several print heads is possible. This saves set-up 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.There are various training possible:
  • It can be provided that the motors are seated on a rail, that the at least two gears are arranged in a series of gears and that the rail is mounted to be displaceable parallel relative to the row of gears.
There may be a drive for moving the rail.
The at least two gears can each be arranged on a screw, wherein the screws can be oriented parallel to each other.
The screws may each have a cone that forms a thrust wedge.
There may be multiple notches for securing angular positions of the at least two gears.
In this case, the screws may have depressions, which together with pressure pieces form the multiple notches.
Preferably, the number of wells of the multiple notches may coincide with the number of teeth of the at least two gears.
In a further development, each gear carried by the motors has a greater axial tooth length than each of the at least two gears.
Preferably, the printheads are inkjet printheads.

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 will become apparent from the following description of an embodiment and the accompanying drawings, in which:
FIG. 1:
a printing machine in general,
FIG. 2:
a pressure bar of the printing machine with an adjustment device in side view,
FIGS. 3a, 3b and 3c:
various relative positions of gears of the adjustment device in plan view and
FIG. 4:
a modification of the adjustment device.

In den Figuren 1 bis 4 sind einander entsprechende Bauteile mit den gleichen Bezugszeichen bezeichnet.In the FIGS. 1 to 4 are mutually corresponding components 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. FIG. 1 shows a printing machine 1 with several identical pressure bar 2. Each print bar 2 prints in the page-ready inkjet another color.

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. FIG. 2 shows an example of the pressure bar 2, the printheads 3 in a row. Each print head 3 has a nozzle plate 4 with nozzles for ejecting the ink. Each printhead 3 has a first screw 5 and second screw 6 associated therewith to adjust the printhead 3 relative to the adjacent printhead 3. Each screw 5, 6 adjusts another degree of freedom of the printhead 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 (pressure bar transverse axis) of the orthogonal coordinate system is parallel to the printing material 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, which is why only the first screw 5 is described in detail. The screw 5 has a cone 7, on 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 deeper, the cone 7 presses the print head 3 in the required direction. The screw 5 has all around a ring of equally distributed wells 9, in which a spring-loaded pressure piece 10 engages. The troughs 9 form a multiple catch. Thus, the pressure piece 10 can engage in each screwing depth of the screw 5 in the troughs 9, these are formed as grooves which extend 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 whose number of teeth corresponds to the number of wells 9. As a result, the multiple catch ensures that the screw 5 stops in stepwise rotation only in those angular positions corresponding to tooth engagement positions of the gear 11. The gear 11 can sit on a shaft of the screw 5 or be formed on the screw 5 as a screw head. Alternatively, in the absence of the ring of troughs 9, the multiple catch could be formed by the gear 11 together with the pressure piece 10, wherein this 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.To a crosshead or rail 12, motors 13 are mounted in a row which is parallel with the row of screws 5, 6. The rail 12 is in parallel with the row of screws 5, 6 parallel direction, ie parallel to the axis x, preferably by a drive 14, for. B. a pneumatic cylinder, slidably mounted. Alternatively, in the absence of the drive 14, the rail 12 or series 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 thus 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 sit a gear 15 and a locking disc 16, in which wells a spring-loaded pressure piece 17 engages. The locking disk 16 and the pressure piece 17 together form a multiple catch. The number of teeth of the gear 15 corresponds to the number of troughs of the locking disk 16. Alternatively, 16 could be formed by the gear 15 together with the pressure piece 17 in the absence of the locking disc 16, the latter engages in the tooth gaps of the gear 15. This would save space. The multiple catch could be completely eliminated if the rotational position of the motor 13 is detected and regulated for the correct meshing.

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 tooth length of the gear 15 is extended, so that when screwing the screw 5 despite the axial movement of the driven gear 11, this is not disengaged from the gear 15. Preferably, therefore, the gear 15 is formed as a toothed shaft. Alternatively, the gears 11 could be formed as splines at normal Verzahnungslänge of the gear 15. 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 FIGS. 3a to 3c For example, various positions of the gear 15 relative to the gears 11 of the screws 5, 6 are shown, these positions being adjusted by the displacement of the rail 12. The axes of rotation or centers of all gears 11, 15 of the pressure bar 2 and the adjusting device lie on a common, straight line. It does not matter if the motor gear 15 is smaller (as in Fig. 3a - 3c ) or larger than the helical gears 11 in diameter or the same size (as in Fig. 2 ).

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. FIG. 3a shows a mean neutral position of the gear 15, in which there is enough air or clearance between this and the two adjacent gears 11 to handle the printhead 3 without collision hazard for the gears 11 when inserting the print head 3 in the pressure bar 2. In the neutral position, the gear 15 is engaged with no gear 11 and is ensured by the multiple notches of the screws 5, 6 and the gear 15, that the gear 15 with respect to the gears 11 of both screws 5, 6 in an operable gap-tooth rotational angular 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. FIG. 3b shows the gear 15 is moved to a position with engagement with the gear 11 of the screw 6 to the right and Figure 3c shows the gear 15 is displaced in an opposite position with engagement in the gear 11 of the other screw 5 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 in succession in the radial direction with the two gears 11 into engagement.

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 may operate in parallel to adjust all the printheads 3 first with respect to one degree of freedom and then with respect to the other. Here, the motors 13 can be controlled individually, z. B. when a print head 3 by a different level than another print head 3 with respect to the axis x must be adjusted.

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. FIG. 4 shows a modification in which three or more gears 11 are driven by one or more print heads 3 by a common motor with a gear 15 in succession. Here, the gear 15 is adjusted with the rail along a line L, which runs parallel to a common tangent of the gears 11. In the process of the gear 15 along the line L from one to the other gear 11 rotates the gear 15. If the distance a between the axes of rotation of the gears 11 is a multiple of the tooth spacing of the teeth of the gear 11, the gear 15 moves as if rolling on a virtual rack. If the distance a is not said multiple, the gear 15 does not rotate during its entire translation, but only in the areas of the teeth of the gears 11 and the motor of the gear 15 is driven accordingly.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Druckmaschinepress
22
Druckbalkenpressure beam
33
Druckkopfprinthead
44
Düsenplattenozzle plate
55
erste Schraubefirst screw
66
zweite Schraubesecond screw
77
Konuscone
88th
Tasterbutton
99
Muldetrough
1010
DruckstückPressure piece
1111
Zahnradgear
1212
Schienerail
1313
Motorengine
1414
Antriebdrive
1515
Zahnradgear
1616
--
1717
DruckstückPressure piece
aa
Abstanddistance
LL
Linieline
xx
Achseaxis
yy
Achseaxis
zz
Achseaxis

Claims (10)

Vorrichtung zur Justage von Druckköpfen (3) eines Druckbalkens (2),
dadurch gekennzeichnet,
dass Motore (13) in einer Reihe angeordnet und gemeinsam verschiebbar gelagert sind,
dass jeder Motor (13) ein Zahnrad (15) trägt und
dass jedes Zahnrad (15) nacheinander mit jeweils mindestens zwei Zahnrädern (11) in Eingriff bringbar ist.Device for adjusting printing heads (3) of a printing bar (2),
characterized,
that motors (13) are arranged in a row and mounted so as to be displaceable together,
that each motor (13) carries a gear (15) and
in that each toothed wheel (15) can be engaged successively with in each case at least two toothed wheels (11). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass die Motore (13) auf einer Schiene (12) sitzen,
dass die mindestens zwei Zahnräder (11) in einer Reihe von Zahnrädern (11) angeordnet sind und
dass die Schiene (12) relativ zu der Reihe von Zahnrädern (11) parallel verschiebbar gelagert ist.Device according to claim 1,
characterized,
that the motors (13) sitting on a rail (12),
in that the at least two toothed wheels (11) are arranged in a row of toothed wheels (11) and
in that the rail (12) is mounted to be displaceable in parallel relative to the row of toothed wheels (11). Vorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
dass ein Antrieb (14) zum Verschieben der Schiene (12) vorhanden ist.Device according to claim 2,
characterized,
in that a drive (14) for displacing the rail (12) is present. Vorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass die mindestens zwei Zahnräder (11) jeweils an einer Schraube (5, 6) angeordnet sind, wobei die Schrauben (5, 6) miteinander parallel orientiert sind.Device according to one of claims 1 to 3,
characterized,
that the at least two gears (11) each on a screw (5, 6) are arranged, wherein the screws (5, 6) are oriented parallel to each other. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
dass die Schrauben (5, 6) jeweils einen Konus (7) aufweisen, der einen Schubkeil bildet.Device according to claim 4,
characterized,
in that the screws (5, 6) each have a cone (7) which forms a thrust wedge. Vorrichtung nach Anspruch 4 oder 5,
dadurch gekennzeichnet,
dass Mehrfachrastungen zum Sichern von Drehwinkelpositionen der mindestens zwei Zahnräder (11) vorhanden sind.Device according to claim 4 or 5,
characterized,
that multiple notches for securing angular positions of the at least two gears (11) are present. Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet,
dass die Schrauben (5, 6) Mulden (9) aufweisen, welche zusammen mit Druckstücken (10) besagte Mehrfachrastungen bilden.Device according to claim 6,
characterized,
in that the screws (5, 6) have depressions (9) which together with pressure pieces (10) form said multiple detents. Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet,
dass die Anzahl der Mulden (9) der Mehrfachrastungen mit der Anzahl der Zähne der mindestens zwei Zahnräder (11) übereinstimmt.Device according to claim 7,
characterized,
in that the number of troughs (9) of the multiple notches coincides with the number of teeth of the at least two toothed wheels (11). Vorrichtung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
dass jedes von den Motoren (13) getragene Zahnrad (15) eine größere axiale Verzahnungslänge als jedes der mindestens zwei Zahnräder (11) aufweist.Device according to one of claims 1 to 8,
characterized,
that each of the motors (13) carried by the toothed wheel (15) has a greater axial spline length than each of the at least two gears (11). Vorrichtung nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet,
dass die Druckköpfe (3) Inkjet-Druckköpfe sind.Device according to one of claims 1 to 9,
characterized,
that the print heads (3) are inkjet printheads.
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

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US20190255867A1 (en) 2019-08-22
JP7206128B2 (en) 2023-01-17
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JP2019142224A (en) 2019-08-29
CN110181947A (en) 2019-08-30
US10737516B2 (en) 2020-08-11

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