EP3486089B1 - Printing machine with a pressure beam for ink jet - Google Patents

Printing machine with a pressure beam for ink jet Download PDF

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Publication number
EP3486089B1
EP3486089B1 EP18199231.4A EP18199231A EP3486089B1 EP 3486089 B1 EP3486089 B1 EP 3486089B1 EP 18199231 A EP18199231 A EP 18199231A EP 3486089 B1 EP3486089 B1 EP 3486089B1
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EP
European Patent Office
Prior art keywords
tape
printing
printing machine
cleaning
contact
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
EP18199231.4A
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German (de)
French (fr)
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EP3486089A1 (en
Inventor
Michael Postels
Andreas MÜLLER
Christian Bull
Bernd Sitzmann
Michael Schwandt
Matthias Zapf
Johann Weigert
Bertram Lütke
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Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication of EP3486089A1 publication Critical patent/EP3486089A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • 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—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16535—Cleaning of print head nozzles using wiping constructions
    • 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—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16585—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
    • B41J2/16588—Print heads movable towards the cleaning unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/17—Cleaning arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • 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—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16535—Cleaning of print head nozzles using wiping constructions
    • B41J2002/1655—Cleaning of print head nozzles using wiping constructions with wiping surface parallel with nozzle plate and mounted on reels, e.g. cleaning ribbon cassettes
    • 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—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • B41J2002/16558—Using cleaning liquid for wet wiping
    • 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
    • B41J2025/008—Actions or mechanisms not otherwise provided for comprising a plurality of print heads placed around a drum

Definitions

  • the present invention relates to a printing machine according to the preamble of claim 1.
  • Such printing machines are in EP 2 612 758 A1 , EP 2 492 097 A1 and US 2010/0245466 A1 described.
  • DE 100 28 318 B4 describes a printing press in which a nozzle exit surface is wiped with a cleaning tape.
  • the cleaning tape consists of a textile or felt material and is permeable to air.
  • a suction device draws ink through the cleaning tape from the print head onto the cleaning tape.
  • An unwinding roller is used to store the clean section of the cleaning tape that has not yet been soaked with the printing ink, and a winding roller is used to store the soiled section of the cleaning tape. In principle, it is a dry cleaning of the nozzle exit surface and not a washing. Since the nozzle exit surface and the nozzles are highly sensitive, there is a risk of damage during dry cleaning.
  • the invention has for its object to provide a printing machine for inkjet printing, in which a printing bar can be cleaned without risk of damage.
  • the test device can work according to the principle of resistance moisture measurement.
  • the first electrical contact and the second electrical contact can be placed at a contact distance from one another that is smaller than a bandwidth of the band.
  • An X-Y guide that guides the pressure bar to the cleaning device can consist of a horizontal guide and a vertical guide.
  • the cleaning device can have a moistening device for moistening the strip with detergent.
  • the cleaning device can have a supply reel for the tape and a pressing element for pressing the tape onto the pressure beam, and the moistening device can be arranged between the supply reel and the pressing element, seen along the tape.
  • controller with a program running in it that controls the printing press in such a way that the testing device checks the moisture of the belt before cleaning the pressure bar with the belt.
  • Figure 1 shows a printing press with a printing bar 1 for inkjet printing in the single-pass method.
  • the pressure bar 1 is directed onto a transport path 2 for printing material 3.
  • the transport path 2 is formed by a drum.
  • the printing material 3 are sheets.
  • the drum transports the sheets in a transport direction 4.
  • a cleaning device 5 for the pressure bar 1 is arranged outside the transport path 2.
  • the pressure bar 1 and the cleaning device 5 are each arranged in a row of pressure bars or cleaning devices in order to realize multi-color printing.
  • the viewing direction II is the Figure 2 underlying.
  • Figure 2 shows that a horizontal guide 6 and a vertical guide 7 are present, which guide the pressure beam 1 from the transport path 2 to the cleaning device 5.
  • the two linear guides are symbolized by double arrows and together form an XY guide.
  • the cleaning device 5 comprises a belt 8 made of textile or felt, a so-called washcloth.
  • the tape 8 is unwound from a supply spool 9 and wound onto a collecting spool 10 after use.
  • a feed drive 11, symbolized by an arrow, transports the tape 8 from the supply reel 9 to the collecting reel 10. Between the two coils 9, 10, the tape 8 runs over a pressing element 12 which presses the tape 8 against a nozzle surface 13 of the pressure beam 1 during cleaning.
  • the nozzle surface 13 can be formed by a plurality of print heads of the print bar 1, which are arranged in series.
  • the pressing element 12 is designed as a roller. It has a suspension 14, which generates the pressing force between belt 8 and nozzle surface 13 during cleaning.
  • the pressure element 12 springs in by the spring travel A.
  • the tape 8 runs past a moistening device 15 after the supply reel 9 and in front of the pressing element 12.
  • the moistening device 15 applies washing liquid to the belt 8.
  • a test device 23 checks the correct functioning of the moistening device 15 by measuring the moisture of the tape 8 soaked in the detergent.
  • the pressure bar 1 comprises a first pair of contact electrodes 16 at one end and at the at the other end a second pair of contact electrodes 17 belonging to the test device 23.
  • Each pair of contact electrodes 16, 17 comprises two electrical contacts which are flush with the nozzle surface 13 and of which in Figure 2 only one is visible and the other is covered.
  • a gap with a gap width B is present between the respective electrical contact and the nozzle surface 13.
  • the electrical contacts are arranged on electrical insulators 19 and connected to the electronic control 18 via power lines, not shown.
  • the controller 18, in which a program runs, controls the pressure bar 1, in particular its drives for moving along the guides 6, 7, and the cleaning device 5, in particular its feed drive 11.
  • the viewing direction III is Figure 3 underlying.
  • Figure 3 shows that the first pair of contact electrodes 16 consists of a first electrical contact 21 and a second electrical contact 22. Between these two electrical contacts 21, 22 there is a contact distance C, which is greater than a plate width D, which has a nozzle plate 20 with the nozzle surface 13. As a result, it can be detected via the two electrical contacts 21, 22 whether the band 8 is in the correct position or runs laterally away from the pressing element 12. In addition, the contact distance C ensures that there is a detected moistening of the band 8 over the entire working width of the band 8, which is slightly smaller than a band width E of the band 8. The contact distance C is smaller than the bandwidth E. The area between the two electrical contacts 21, 22 is reduced by approximately 3 mm, so that no moisture film can form there.
  • the pressure beam 1 is moved by its drives along the guides 6, 7 and thereby the two electrical contacts 21, 22 and the nozzle surface 13 are brought into contact with the band 8.
  • the electrical contacts 21, 22 are connected to a measuring bridge, which is part of the test device 23. With a voltage applied to the electrical contacts 21, 22, the electrical resistance of the band 8 is measured, which depends on its moistening. When the tape 8 is wet, the electrical resistance of the tape 8 is significantly less than when it is dry.
  • a first resistance measurement is carried out before cleaning the nozzle surface 13 and then a second resistance measurement.
  • the first resistance measurement checks whether the band 8 has been properly moistened by the moistening device 15. This prevents the nozzle surface 13 from being brought into contact with a dry band 8.
  • With the second resistance measurement it is checked whether the moistening device 15 has worked without problems during the cleaning of the nozzle surface 13 and has not failed.
  • the nozzle surface 13 is highly sensitive and could be damaged if it were wiped with a dry tape. If the test device 23 determines that the moistening device 15 has failed during cleaning, it signals this to the operator so that the operator can test the nozzle surface 13 for damage.
  • the two electrical contacts of the second pair of contact electrodes 17 shorten the total time required for the measurements and are connected in parallel with the two electrical contacts 21, 22 of the first pair of contact electrodes 16.
  • the measured values of the contact electrode pairs 16, 17 are evaluated in an electronic evaluation unit of the control 18.
  • the second pair of contact electrodes 17 can be omitted.

Description

Vorliegende Erfindung betrifft eine Druckmaschine nach dem Obergriff des Anspruchs 1.The present invention relates to a printing machine according to the preamble of claim 1.

Solche Druckmaschinen sind in EP 2 612 758 A1 , EP 2 492 097 A1 und US 2010/0245466 A1 beschrieben.Such printing machines are in EP 2 612 758 A1 , EP 2 492 097 A1 and US 2010/0245466 A1 described.

In DE 100 28 318 B4 ist eine Druckmaschine beschrieben, bei welcher eine Düsenaustrittsfläche mit einem Reinigungsband abgewischt wird. Das Reinigungsband besteht aus einem textilen oder filzigen Material und ist luftdurchlässig. Beim Reinigen wird mit einer Absaugeinrichtung durch das Reinigungsband hindurch Druckfarbe vom Druckkopf auf das Reinigungsband gesaugt. Eine Abwickelrolle dient der Bevorratung das sauberen und noch nicht mit der Druckfarbe getränkten Abschnittes des Reinigungsbandes und einer Aufwickelrolle dient der Speicherung des verschmutzten Abschnittes des Reinigungsbandes. Im Prinzip handelt es sich um eine Trockenreinigung der Düsenaustrittsfläche und nicht um ein Waschen. Da die Düsenaustrittsfläche und die Düsen hochempfindlich sind, besteht bei der Trockenreinigung die Gefahr ihrer Beschädigung.In DE 100 28 318 B4 describes a printing press in which a nozzle exit surface is wiped with a cleaning tape. The cleaning tape consists of a textile or felt material and is permeable to air. During cleaning, a suction device draws ink through the cleaning tape from the print head onto the cleaning tape. An unwinding roller is used to store the clean section of the cleaning tape that has not yet been soaked with the printing ink, and a winding roller is used to store the soiled section of the cleaning tape. In principle, it is a dry cleaning of the nozzle exit surface and not a washing. Since the nozzle exit surface and the nozzles are highly sensitive, there is a risk of damage during dry cleaning.

Der Erfindung liegt die Aufgabe zugrunde eine Druckmaschine für Inkjetdruck zu schaffen, bei welcher ein Druckbalken ohne Beschädigungsgefahr gereinigt werden kann.The invention has for its object to provide a printing machine for inkjet printing, in which a printing bar can be cleaned without risk of damage.

Diese Aufgabe wird durch eine Druckmaschine mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a printing press with the features of claim 1.

Es ist ein Vorteil der erfindungsgemäßen Druckmaschine, dass bei dieser der Druckbalken mit dem Band feucht abgewischt werden kann, also gewaschen. Beim Waschen lösen sich Verkrustungen viel leichter ab als bei einer Trockenreinigung und besteht demzufolge ein geringeres Risiko der Beschädigung des Druckbalkens. Durch die Prüfvorrichtung ist sichergestellt, dass das Band die zum Waschen erforderliche Feuchtigkeit aufweist, wenn es eingesetzt wird.It is an advantage of the printing machine according to the invention that in this the printing bar can be wiped with the tape, ie washed. When washing, incrustations come off much more easily than with dry cleaning and there is therefore less risk of damage to the pressure beam. Through the tester ensures that the tape has the moisture required for washing when used.

Es sind verschiedene vorteilhafte Weiterbildungen möglich:
Die Prüfvorrichtung kann nach dem Prinzip der Widerstandsfeuchtemessung arbeiten.Various advantageous developments are possible:
The test device can work according to the principle of resistance moisture measurement.

Der erste Elektrokontakt und der zweite Elektrokontakt können voneinander in einem Kontaktabstand platziert sein, der kleiner als eine Bandbreite des Bands ist.The first electrical contact and the second electrical contact can be placed at a contact distance from one another that is smaller than a bandwidth of the band.

Es kann einen Horizontalführung vorhanden sein, die den Druckbalken führt und dabei zuerst den ersten Elektrokontakt und den zweiten Elektrokontakt und danach eine Düsenfläche des Druckbalkens in Kontakt mit dem Band bringt.There may be a horizontal guide which guides the pressure bar and thereby first brings the first electrical contact and the second electrical contact and then a nozzle surface of the pressure bar into contact with the tape.

Eine X-Y-Führung, die den Druckbalken zur Reinigungsvorrichtung führt, kann aus der Horizontalführung und einer Vertikalführung bestehen.An X-Y guide that guides the pressure bar to the cleaning device can consist of a horizontal guide and a vertical guide.

Die Reinigungsvorrichtung kann eine Befeuchtungsvorrichtung zum Befeuchten des Bands mit Waschmittel aufweisen.The cleaning device can have a moistening device for moistening the strip with detergent.

Die Reinigungsvorrichtung kann eine Vorratsspule für das Band und ein Andrückelement zum Andrücken des Bands an den Druckbalken aufweisen und die Befeuchtungsvorrichtung kann entlang dem Band gesehen zwischen der Vorratsspule und dem Andrückelement angeordnet sein.The cleaning device can have a supply reel for the tape and a pressing element for pressing the tape onto the pressure beam, and the moistening device can be arranged between the supply reel and the pressing element, seen along the tape.

Es kann eine Steuerung mit einem in ihr ablaufenden Programm vorhanden sein, das die Druckmaschine derart steuert, dass die Prüfvorrichtung die Feuchtigkeit des Bands vor jeder Reinigung des Druckbalkens mit dem Band prüft.There may be a controller with a program running in it that controls the printing press in such a way that the testing device checks the moisture of the belt before cleaning the pressure bar with the belt.

Weitere vorteilhafte Weiterbildungen ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels und der zugehörigen Zeichnung, worin zeigt:

Figur 1
die Gesamtdarstellung einer Digitaldruckmaschine mit einem Druckbalken und einer Reinigungsvorrichtung,
Figur 2
die Einzeldarstellung des Druckbalkens und der Reinigungsvorrichtung in Frontalansicht und
Figur 3
die Einzeldarstellung des Druckbalkens und der Reinigungsvorrichtung in Seitenansicht.
Further advantageous developments result from the following description of an exemplary embodiment and the associated drawing, in which:
Figure 1
the overall representation of a digital printing press with a pressure bar and a cleaning device,
Figure 2
the individual representation of the pressure bar and the cleaning device in front view and
Figure 3
the individual representation of the pressure bar and the cleaning device in side view.

Figur 1 zeigt eine Druckmaschine mit einem Druckbalken 1 für Inkjetdruck im Single-Pass-Verfahren. Der Druckbalken 1 ist auf einen Transportpfad 2 für Bedruckstoff 3 gerichtet. Der Transportpfad 2 wird durch eine Trommel gebildet. Der Bedruckstoff 3 sind Bogen. Die Trommel transportiert die Bogen in eine Transportrichtung 4. Außerhalb des Transportpfads 2 ist eine Reinigungsvorrichtung 5 für den Druckbalken 1 angeordnet. Der Druckbalken 1 und die Reinigungsvorrichtung 5 sind jeweils in einer Reihe von Druckbalken bzw. Reinigungsvorrichtungen angeordnet, um Mehrfarbdruck zu realisieren. Die Blickrichtung II liegt der Figur 2 zugrunde. Figure 1 shows a printing press with a printing bar 1 for inkjet printing in the single-pass method. The pressure bar 1 is directed onto a transport path 2 for printing material 3. The transport path 2 is formed by a drum. The printing material 3 are sheets. The drum transports the sheets in a transport direction 4. A cleaning device 5 for the pressure bar 1 is arranged outside the transport path 2. The pressure bar 1 and the cleaning device 5 are each arranged in a row of pressure bars or cleaning devices in order to realize multi-color printing. The viewing direction II is the Figure 2 underlying.

Figur 2 zeigt, dass eine Horizontalführung 6 und eine Vertikalführung 7 vorhanden sind, die den Druckbalken 1 vom Transportpfad 2 zur Reinigungsvorrichtung 5 führen. Die beiden Linearführungen sind mit Doppelpfeilen symbolisiert und bilden zusammen eine X-Y-Führung. Die Reinigungsvorrichtung 5 umfasst ein Band 8 aus Textil oder Filz, ein sogenanntes Waschtuch. Das Band 8 wird von einer Vorratsspule 9 abgewickelt und nach Gebrauch auf eine Sammelspule 10 aufgewickelt. Ein mit Pfeil symbolisierter Vorschubantrieb 11 transportiert das Band 8 von der Vorratsspule 9 zur Sammelspule 10. Zwischen den beiden Spulen 9, 10 läuft das Band 8 über ein Andrückelement 12, das beim Reinigen das Band 8 an eine Düsenfläche 13 des Druckbalkens 1 drückt. Die Düsenfläche 13 kann durch mehrere Druckköpfe des Druckbalkens 1 gebildet sein, die in Reihe angeordnet sind. Das Andrückelement 12 ist als Rolle ausgebildet. Es hat eine Federung 14, welche beim Reinigen die Presskraft zwischen Band 8 und Düsenfläche 13 erzeugt. Dabei federt das Andrückelement 12 um den Federweg A ein. Das Band 8 läuft an einer Befeuchtungsvorrichtung 15 nach der Vorratsspule 9 und vor dem Andrückelement 12 vorbei. Die Befeuchtungsvorrichtung 15 bringt Waschflüssigkeit auf das Band 8 auf. Figure 2 shows that a horizontal guide 6 and a vertical guide 7 are present, which guide the pressure beam 1 from the transport path 2 to the cleaning device 5. The two linear guides are symbolized by double arrows and together form an XY guide. The cleaning device 5 comprises a belt 8 made of textile or felt, a so-called washcloth. The tape 8 is unwound from a supply spool 9 and wound onto a collecting spool 10 after use. A feed drive 11, symbolized by an arrow, transports the tape 8 from the supply reel 9 to the collecting reel 10. Between the two coils 9, 10, the tape 8 runs over a pressing element 12 which presses the tape 8 against a nozzle surface 13 of the pressure beam 1 during cleaning. The nozzle surface 13 can be formed by a plurality of print heads of the print bar 1, which are arranged in series. The pressing element 12 is designed as a roller. It has a suspension 14, which generates the pressing force between belt 8 and nozzle surface 13 during cleaning. The pressure element 12 springs in by the spring travel A. The tape 8 runs past a moistening device 15 after the supply reel 9 and in front of the pressing element 12. The moistening device 15 applies washing liquid to the belt 8.

Eine Prüfvorrichtung 23 kontrolliert die korrekte Funktion der Befeuchtungsvorrichtung 15, indem sie die Feuchtigkeit des mit dem Waschmittel getränkten Bands 8 misst. Der Druckbalken 1 umfasst an einem Ende ein erstes Kontaktelektrodenpaar 16 und an dem anderen Ende ein zweites Kontaktelektrodenpaar 17, die zu der Prüfvorrichtung 23 gehören. Jedes Kontaktelektrodenpaar 16, 17 umfasst zwei Elektrokontakte, die mit der Düsenfläche 13 bündig sind und von denen in Figur 2 jeweils nur einer sichtbar und der andere verdeckt ist. Zwischen dem jeweiligen Elektrokontakt und der Düsenfläche 13 ist ein Spalt mit einer Spaltbreite B vorhanden. Die Elektrokontakte sind auf elektrischen Isolatoren 19 angeordnet und über nicht gezeigte Stromleitungen mit der elektronischen Steuerung 18 verbunden. Die Steuerung 18, in der ein Programm abläuft, steuert den Druckbalken 1, insbesondere seine Antriebe zum Verfahren entlang der Führungen 6, 7, und die Reinigungsvorrichtung 5, insbesondere ihren Vorschubantrieb 11. Die Blickrichtung III liegt der Figur 3 zugrunde.A test device 23 checks the correct functioning of the moistening device 15 by measuring the moisture of the tape 8 soaked in the detergent. The pressure bar 1 comprises a first pair of contact electrodes 16 at one end and at the at the other end a second pair of contact electrodes 17 belonging to the test device 23. Each pair of contact electrodes 16, 17 comprises two electrical contacts which are flush with the nozzle surface 13 and of which in Figure 2 only one is visible and the other is covered. A gap with a gap width B is present between the respective electrical contact and the nozzle surface 13. The electrical contacts are arranged on electrical insulators 19 and connected to the electronic control 18 via power lines, not shown. The controller 18, in which a program runs, controls the pressure bar 1, in particular its drives for moving along the guides 6, 7, and the cleaning device 5, in particular its feed drive 11. The viewing direction III is Figure 3 underlying.

Figur 3 zeigt, dass das erste Kontaktelektrodenpaar 16 aus einem ersten Elektrokontakt 21 und einem zweiten Elektrokontakt 22 besteht. Zwischen diesen beiden Elektrokontakten 21, 22 besteht ein Kontaktabstand C, der größer als eine Plattenbreite D ist, welche eine Düsenplatte 20 mit der Düsenfläche 13 aufweist. Dadurch kann über die beiden Elektrokontakte 21, 22 detektiert werden, ob sich das Band 8 in korrekter Position befindet oder von dem Andrückelement 12 seitlich weg läuft. Außerdem ist durch den Kontaktabstand C sichergestellt, dass eine detektierte Befeuchtung des Bands 8 über die gesamte Arbeitsbreite des Bandes 8 vorhanden ist, die etwas kleiner als eine Bandbreite E des Bandes 8 ist. Der Kontaktabstand C ist kleiner als die Bandbreite E. Der Bereich zwischen den beiden Elektrokontakten 21, 22 ist um circa 3 mm zurückgenommen, damit sich dort kein Feuchtigkeitsfilm bilden kann. Figure 3 shows that the first pair of contact electrodes 16 consists of a first electrical contact 21 and a second electrical contact 22. Between these two electrical contacts 21, 22 there is a contact distance C, which is greater than a plate width D, which has a nozzle plate 20 with the nozzle surface 13. As a result, it can be detected via the two electrical contacts 21, 22 whether the band 8 is in the correct position or runs laterally away from the pressing element 12. In addition, the contact distance C ensures that there is a detected moistening of the band 8 over the entire working width of the band 8, which is slightly smaller than a band width E of the band 8. The contact distance C is smaller than the bandwidth E. The area between the two electrical contacts 21, 22 is reduced by approximately 3 mm, so that no moisture film can form there.

Der Druckbalken 1 wird durch seine Antriebe entlang der Führungen 6, 7 verfahren und dadurch werden die beiden Elektrokontakte 21, 22 und die Düsenfläche 13 mit dem Band 8 in Kontakt gebracht. Die Elektrokontakte 21, 22 sind an eine Messbrücke angeschlossen, die Bestandteil der Prüfvorrichtung 23 ist. Mit einer an die Elektrokontakte 21, 22 angelegten Spannung wird der elektrische Widerstand des Bands 8 gemessen, der von dessen Befeuchtung abhängt. Wenn das Band 8 feucht ist, ist der elektrische Widerstand des Bands 8 signifikant kleiner als wenn es trocken ist.The pressure beam 1 is moved by its drives along the guides 6, 7 and thereby the two electrical contacts 21, 22 and the nozzle surface 13 are brought into contact with the band 8. The electrical contacts 21, 22 are connected to a measuring bridge, which is part of the test device 23. With a voltage applied to the electrical contacts 21, 22, the electrical resistance of the band 8 is measured, which depends on its moistening. When the tape 8 is wet, the electrical resistance of the tape 8 is significantly less than when it is dry.

Es wird eine erste Widerstandsmessung vor der Reinigung der Düsenfläche 13 und danach eine zweite Widerstandsmessung durchgeführt. Mit der ersten Widerstandsmessung wird geprüft, ob das Band 8 durch die Befeuchtungsvorrichtung 15 ordnungsgemäß befeuchtet worden ist. Dadurch wird vermieden, dass die Düsenfläche 13 mit einem trockenen Band 8 in Kontakt gebracht wird. Mit der zweiten Widerstandsmessung wird geprüft, ob die Befeuchtungsvorrichtung 15 während des Reinigens der Düsenfläche 13 störungsfrei gearbeitet hat und nicht ausgefallen ist. Die Düsenfläche 13 ist hochempfindlich und könnte beschädigt werden, wenn sie mit einem trockenen Band abgewischt werden würde. Wenn die Prüfvorrichtung 23 feststellt, dass die Befeuchtungsvorrichtung 15 während der Reinigung ausgefallen ist, signalisiert sie dies dem Bediener, damit dieser die Düsenfläche 13 auf Beschädigungen prüfen kann.A first resistance measurement is carried out before cleaning the nozzle surface 13 and then a second resistance measurement. The first resistance measurement checks whether the band 8 has been properly moistened by the moistening device 15. This prevents the nozzle surface 13 from being brought into contact with a dry band 8. With the second resistance measurement, it is checked whether the moistening device 15 has worked without problems during the cleaning of the nozzle surface 13 and has not failed. The nozzle surface 13 is highly sensitive and could be damaged if it were wiped with a dry tape. If the test device 23 determines that the moistening device 15 has failed during cleaning, it signals this to the operator so that the operator can test the nozzle surface 13 for damage.

Das in der Steuerung 18 ablaufende Programm beinhaltet die Schritte:

  1. 1. Prüfen der Feuchtigkeit des Bands 8 vor der Reinigung des Druckbalkens 1,
  2. 2. Reinigung des Druckbalkens 1,
  3. 3. Prüfen der Feuchtigkeit des Bands 8 nach der Reinigung des Druckbalkens 1.
The program running in the controller 18 includes the steps:
  1. 1. Check the moisture of the belt 8 before cleaning the pressure beam 1,
  2. 2. Cleaning the pressure bar 1,
  3. 3. Check the moisture of the belt 8 after cleaning the pressure beam 1.

Die beiden Elektrokontakte des zweiten Kontaktelektrodenpaares 17 verkürzen die für die Messungen insgesamt erforderliche Zeit und sind mit den beiden Elektrokontakten 21, 22 des ersten Kontaktelektrodenpaares 16 parallelgeschaltet. Die Messwerte der Kontaktelektrodenpaare 16, 17 werden in einer Auswerteelektronik der Steuerung 18 ausgewertet.The two electrical contacts of the second pair of contact electrodes 17 shorten the total time required for the measurements and are connected in parallel with the two electrical contacts 21, 22 of the first pair of contact electrodes 16. The measured values of the contact electrode pairs 16, 17 are evaluated in an electronic evaluation unit of the control 18.

In bestimmten Fällen, in denen es auf die Zeitersparnis nicht ankommt, kann das zweite Kontaktelektrodenpaar 17 entfallen.In certain cases in which time saving is not important, the second pair of contact electrodes 17 can be omitted.

Hierbei ist es möglich, die Elektrokontakte 21, 22 des ersten Kontaktelektrodenpaares 16 als parallele Streifen auszubilden, die sich jeweils von einem bis zum anderen Ende des Druckbalkens 1 ohne Unterbrechung erstrecken, wodurch eine kontinuierliche Messung während der Reinigung möglich wird.It is possible to design the electrical contacts 21, 22 of the first pair of contact electrodes 16 as parallel strips, each of which extends from one end to the other end of the pressure beam 1 without interruption, which enables continuous measurement during cleaning.

BezugszeichenlisteReference list

11
DruckbalkenPressure bar
22nd
TransportpfadTransport path
33rd
BedruckstoffSubstrate
44th
TransportrichtungDirection of transport
55
ReinigungsvorrichtungCleaning device
66
HorizontalführungHorizontal guidance
77
VertikalführungVertical guidance
88th
Bandtape
99
VorratsspuleSupply spool
1010th
SammelspuleCollecting coil
1111
VorschubantriebFeed drive
1212th
AndrückelementPressing element
1313
DüsenflächeNozzle area
1414
Federungsuspension
1515
BefeuchtungsvorrichtungHumidifier
1616
erstes Kontaktelektrodenpaarfirst pair of contact electrodes
1717th
zweites Kontaktelektrodenpaarsecond pair of contact electrodes
1818th
Steuerungcontrol
1919th
Isolatorinsulator
2020th
DüsenplatteNozzle plate
2121
erster Elektrokontaktfirst electrical contact
2222
zweiter Elektrokontaktsecond electrical contact
2323
PrüfvorrichtungTester
AA
FederwegTravel
BB
SpaltbreiteGap width
CC.
KontaktabstandContact distance
DD
PlattenbreitePlate width
EE
BandbreiteBandwidth

Claims (8)

  1. Printing machine comprising
    - an inkjet printing bar,
    - a cleaning device (5) with a tape (8) for cleaning the printing bar (1), and
    - a testing device (23) for testing the moisture content of the tape (8),
    characterized
    in that the testing device (23) has a first electronic contract (21) and a second electronic contact (22), said electronic contacts (21, 22) disposed on the printing bar (1).
  2. Printing machine according to claim 1,
    characterized
    in that the testing device (23) operates in accordance with the resistance moisture measurement principle.
  3. Printing machine according to claim 1 or 2,
    characterized
    in that the first electronic contact (21) and the second electronic contact (22) are positioned at a contact distance (C) relative to one another, said contact distance (C) smaller than the tape width (E) of the tape (8).
  4. Printing machine according to any one of claims 1 to 3,
    characterized
    in that a horizontal guide (6) is provided to guide the printing bar (1) and, in the process, brings first the first electronic contact (21) and the second electronic contact (22) and subsequently a nozzle surface (13) of the printing bar (1) into contact with the tape (8).
  5. Printing machine according to claim 4,
    characterized
    in that an XY guide that guides the printing bar (1) to the cleaning device (5) consists of the horizontal guide (6) and a vertical guide (7).
  6. Printing machine according to any one of claims 1 to 5,
    characterized
    in that the cleaning device (5) includes a moisturizing device (15) for moisturizing the tape (8) with a detergent.
  7. Printing machine according to claim 6,
    characterized
    in that the cleaning device (5) has a supply coil (9) for the tape (8) and a pressure element (12) for pressing the tape (8) against the printing bar (1) and in that the moisturizing device (15) is disposed between the supply coil (9) and the pressure element (12) as viewed along the tape (8).
  8. Printing machine according to any one of claims 1 to 7,
    characterized
    in that a control unit (18) is provided with a programme running thereon to control the printing machine in such a way that the testing device (23) tests the moisture content of the tape (8) before every cleaning operation to clean the printing bar (1) using the tape (8).
EP18199231.4A 2017-11-15 2018-10-09 Printing machine with a pressure beam for ink jet Active EP3486089B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017220343.9A DE102017220343A1 (en) 2017-11-15 2017-11-15 Printing machine with a pressure bar for inkjet

Publications (2)

Publication Number Publication Date
EP3486089A1 EP3486089A1 (en) 2019-05-22
EP3486089B1 true EP3486089B1 (en) 2020-04-08

Family

ID=63798865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18199231.4A Active EP3486089B1 (en) 2017-11-15 2018-10-09 Printing machine with a pressure beam for ink jet

Country Status (3)

Country Link
EP (1) EP3486089B1 (en)
CN (1) CN109774311B (en)
DE (1) DE102017220343A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10028318B4 (en) 1999-06-28 2017-02-16 Heidelberger Druckmaschinen Ag Method and apparatus for cleaning a printhead of an inkjet printer
JP2003182098A (en) * 2001-12-21 2003-07-03 Konica Corp Inkjet recorder
US8342639B2 (en) * 2009-03-31 2013-01-01 Fujifilm Corporation Head cleaning method and head cleaning apparatus
JP5472143B2 (en) * 2011-01-31 2014-04-16 ブラザー工業株式会社 Liquid ejection apparatus and program
JP5269929B2 (en) * 2011-02-24 2013-08-21 富士フイルム株式会社 Nozzle surface cleaning apparatus and inkjet recording apparatus
JP5653371B2 (en) * 2012-01-06 2015-01-14 富士フイルム株式会社 Nozzle surface cleaning device and image recording device
JPWO2018230275A1 (en) * 2017-06-15 2020-03-19 富士フイルム株式会社 Humidifier, maintenance device, and liquid discharge device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN109774311B (en) 2021-07-06
CN109774311A (en) 2019-05-21
DE102017220343A1 (en) 2019-05-16
EP3486089A1 (en) 2019-05-22

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