EP3486089A1 - 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
EP3486089A1
EP3486089A1 EP18199231.4A EP18199231A EP3486089A1 EP 3486089 A1 EP3486089 A1 EP 3486089A1 EP 18199231 A EP18199231 A EP 18199231A EP 3486089 A1 EP3486089 A1 EP 3486089A1
Authority
EP
European Patent Office
Prior art keywords
belt
printing machine
cleaning
machine according
electrical 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.)
Granted
Application number
EP18199231.4A
Other languages
German (de)
French (fr)
Other versions
EP3486089B1 (en
Inventor
Michael Postels
Andreas MÜLLER
Christian Bull
Bernd Sitzmann
Michael Schwandt
Matthias Zapf
Johann Weigert
Bertram Lütke
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
Publication of EP3486089A1 publication Critical patent/EP3486089A1/en
Application granted granted Critical
Publication of EP3486089B1 publication Critical patent/EP3486089B1/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
    • 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—Prevention or detection 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—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16585—Prevention or detection 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—Prevention or detection 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—Prevention or detection 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 comprising a printing bar for inkjet and a cleaning device with a belt for cleaning the printing bar.
  • DE 100 28 318 B4 is a printing machine described in which a nozzle exit surface is wiped with a cleaning tape.
  • the cleaning tape is made of a textile or felt material and is permeable to air.
  • ink is sucked from the print head onto the cleaning belt with a suction device through the cleaning belt.
  • An unwinding roll is used to store the clean and not yet impregnated with the ink portion of the cleaning tape and a take-up roll is used to store the soiled portion of the cleaning tape.
  • 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 pressure bar can be cleaned without risk of damage.
  • the printing machine comprises a printing bar for inkjet, a cleaning device with a belt for cleaning the printing bar and a test device for checking the moisture of the belt.
  • the printing bar can be wiped wet with the tape, ie washed.
  • encrustations dissolve much easier than with a dry cleaning and consequently there is less risk of damage to the pressure bar.
  • the test device is ensuring that the tape has the moisture needed for washing when it is being used.
  • the tester can work on the principle of resistance moisture measurement.
  • the test device may comprise a first electrical contact and a second electrical contact, which are arranged on the pressure bar.
  • the first electrical contact and the second electrical contact may be placed one another at a contact pitch that is smaller than a bandwidth of the tape.
  • An X-Y guide which leads the pressure bar to the cleaning device, may consist of the horizontal guide and a vertical guide.
  • the cleaning device may include a moistening device for moistening the belt with detergent.
  • the cleaning device may comprise a supply spool for the belt and a pressure element for pressing the belt against the pressure beam and the moistening device may be arranged along the belt between the supply spool and the pressure element.
  • controller with a program running in it that controls the press such that the tester checks the moisture of the tape before each cleaning of the print bar with the tape.
  • FIG. 1 shows a printing machine with a pressure bar 1 for inkjet printing in single-pass process.
  • the pressure bar 1 is directed to a transport path 2 for substrate 3.
  • the transport path 2 is formed by a drum.
  • the printing substrate 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 to realize multi-color printing.
  • the viewing direction II is the FIG. 2 based.
  • FIG. 2 shows that a horizontal guide 6 and a vertical guide 7 are present, which guide the pressure bar 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 band 8 made of textile or felt, a so-called washing cloth.
  • the tape 8 is unwound from a supply reel 9 and wound up after use on a collecting coil 10.
  • a feed drive 11 symbolized by an arrow transports the belt 8 from the supply reel 9 to the collecting reel 10. Between the two reels 9, 10, the belt 8 passes over a pressure element 12 which presses the belt 8 against a nozzle surface 13 of the pressure beam 1 during cleaning.
  • the nozzle surface 13 may be formed by a plurality of print heads of the printing 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 the belt 8 and the nozzle surface 13 during cleaning. In this case, the pressure element 12 springs around the spring travel A.
  • the band 8 passes on a moistening device 15 after the supply spool 9 and before the pressing member 12 over. The moistening device 15 applies washing liquid to the belt 8.
  • a test device 23 controls the correct functioning of the moistening device 15 by measuring the moisture of the detergent-impregnated belt 8.
  • the pressure bar 1 comprises at one end a first contact electrode pair 16 and on the the other end, a second pair of contact electrodes 17 belonging to the test device 23.
  • Each contact electrode pair 16, 17 comprises two electrical contacts, which are flush with the nozzle surface 13 and of which in FIG. 2 only one is visible and the other is hidden. Between the respective electrical contact and the nozzle surface 13, a gap with a gap width B is present.
  • the electrical contacts are arranged on electrical insulators 19 and connected via not shown power lines to the electronic controller 18.
  • 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 the FIG. 3 based.
  • FIG. 3 shows that the first contact electrode pair 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, it is ensured by the contact distance C that a detected moistening of the belt 8 over the entire working width of the belt 8 is present, which is slightly smaller than a bandwidth E of the belt 8. The contact distance C is smaller than the bandwidth E. The area between the two electrical contacts 21, 22 is retracted by about 3 mm, so that no moisture film can form there.
  • the pressure bar 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 belt 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 voltage of the electrical resistance of the belt 8 is measured, which depends on its humidification. When the belt 8 is wet, the electrical resistance of the belt 8 is significantly less than when it is dry.
  • a first resistance measurement is carried out before the nozzle surface 13 is cleaned and then a second resistance measurement is carried out.
  • the first resistance measurement it is checked whether the band 8 has been properly moistened by the moistening device 15. This avoids that the nozzle surface 13 is brought into contact with a dry belt 8.
  • the second resistance measurement it is checked whether the moistening device 15 has worked without trouble during the cleaning of the nozzle surface 13 and has not failed.
  • the nozzle surface 13 is highly sensitive and could be damaged if 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 he can check 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 evaluation electronics of the controller 18.
  • the second pair of contact electrodes 17 can be omitted.

Landscapes

  • Ink Jet (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

Eine Druckmaschine umfasst einen Druckbalken (1) für InkJet, eine Reinigungsvorrichtung (5) mit einem Band (8) zum Reinigen des Druckbalkens und eine Prüfvorrichtung (23) zum Prüfen der Feuchtigkeit des Bands (8). Die Prüfvorrichtung (23) kann nach dem Prinzip der Widerstandsfeuchtemessung arbeiten. Dazu kann die Prüfvorrichtung (23) einen ersten Elektrokontakt (21) und einen zweiten Elektrokontakt aufweisen, die am Druckbalken 1 angeordnet sind.A printing machine comprises a printing bar (1) for inkjet, a cleaning device (5) with a belt (8) for cleaning the printing bar and a test device (23) for checking the humidity of the belt (8). The test device (23) can work on the principle of resistance moisture measurement. For this purpose, the test device (23) may have a first electrical contact (21) and a second electrical contact, which are arranged on the pressure bar 1.

Description

Vorliegende Erfindung betrifft eine Druckmaschine, die einen Druckbalken für Inkjet und eine Reinigungsvorrichtung mit einem Band zum Reinigen des Druckbalkens umfasst.The present invention relates to a printing machine comprising a printing bar for inkjet and a cleaning device with a belt for cleaning the printing bar.

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 is a printing machine described in which a nozzle exit surface is wiped with a cleaning tape. The cleaning tape is made of a textile or felt material and is permeable to air. During cleaning, ink is sucked from the print head onto the cleaning belt with a suction device through the cleaning belt. An unwinding roll is used to store the clean and not yet impregnated with the ink portion of the cleaning tape and a take-up roll is used to store the soiled portion 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 pressure bar can be cleaned without risk of damage.

Diese Aufgabe wird durch eine Druckmaschine mit den Merkmalen des Anspruchs 1 gelöst. Die erfindungsgemäße Druckmaschine umfasst einen Druckbalken für Inkjet, eine Reinigungsvorrichtung mit einem Band zum Reinigen des Druckbalkens und eine Prüfvorrichtung zum Prüfen der Feuchtigkeit des Bands.This object is achieved by a printing machine with the features of claim 1. The printing machine according to the invention comprises a printing bar for inkjet, a cleaning device with a belt for cleaning the printing bar and a test device for checking the moisture of the belt.

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 press according to the invention that in this case the printing bar can be wiped wet with the tape, ie washed. When washing, encrustations dissolve much easier than with a dry cleaning and consequently there is less risk of damage to the pressure bar. By the test device is ensuring that the tape has the moisture needed for washing when it is being used.

Es sind verschiedene vorteilhafte Weiterbildungen möglich: Die Prüfvorrichtung kann nach dem Prinzip der Widerstandsfeuchtemessung arbeiten.There are various advantageous developments possible: The tester can work on the principle of resistance moisture measurement.

Die Prüfvorrichtung kann einen ersten Elektrokontakt und einen zweiten Elektrokontakt aufweisen, die am Druckbalken angeordnet sind.The test device may comprise a first electrical contact and a second electrical contact, which are arranged on the pressure bar.

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 may be placed one another at a contact pitch that is smaller than a bandwidth of the tape.

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 beam, bringing first the first electrical contact and the second electrical contact and then a nozzle surface of the pressure beam into contact with the belt.

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

Die Reinigungsvorrichtung kann eine Befeuchtungsvorrichtung zum Befeuchten des Bands mit Waschmittel aufweisen.The cleaning device may include a moistening device for moistening the belt 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 may comprise a supply spool for the belt and a pressure element for pressing the belt against the pressure beam and the moistening device may be arranged along the belt between the supply spool and the pressure element.

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 press such that the tester checks the moisture of the tape before each cleaning of the print bar with the tape.

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 will become apparent from the following description of an embodiment and the accompanying drawings, wherein:
FIG. 1
the overall representation of a digital printing machine with a pressure bar and a cleaning device,
FIG. 2
the detail view of the pressure beam and the cleaning device in frontal view and
FIG. 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. FIG. 1 shows a printing machine with a pressure bar 1 for inkjet printing in single-pass process. The pressure bar 1 is directed to a transport path 2 for substrate 3. The transport path 2 is formed by a drum. The printing substrate 3 are sheets. The drum transports the sheets in a transport direction 4. Outside the transport path 2, a cleaning device 5 for the pressure bar 1 is arranged. The pressure bar 1 and the cleaning device 5 are each arranged in a row of pressure bars or cleaning devices to realize multi-color printing. The viewing direction II is the FIG. 2 based.

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. FIG. 2 shows that a horizontal guide 6 and a vertical guide 7 are present, which guide the pressure bar 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 band 8 made of textile or felt, a so-called washing cloth. The tape 8 is unwound from a supply reel 9 and wound up after use on a collecting coil 10. A feed drive 11 symbolized by an arrow transports the belt 8 from the supply reel 9 to the collecting reel 10. Between the two reels 9, 10, the belt 8 passes over a pressure element 12 which presses the belt 8 against a nozzle surface 13 of the pressure beam 1 during cleaning. The nozzle surface 13 may be formed by a plurality of print heads of the printing 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 the belt 8 and the nozzle surface 13 during cleaning. In this case, the pressure element 12 springs around the spring travel A. The band 8 passes on a moistening device 15 after the supply spool 9 and before the pressing member 12 over. 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 controls the correct functioning of the moistening device 15 by measuring the moisture of the detergent-impregnated belt 8. The pressure bar 1 comprises at one end a first contact electrode pair 16 and on the the other end, a second pair of contact electrodes 17 belonging to the test device 23. Each contact electrode pair 16, 17 comprises two electrical contacts, which are flush with the nozzle surface 13 and of which in FIG. 2 only one is visible and the other is hidden. Between the respective electrical contact and the nozzle surface 13, a gap with a gap width B is present. The electrical contacts are arranged on electrical insulators 19 and connected via not shown power lines to the electronic controller 18. 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 the FIG. 3 based.

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. FIG. 3 shows that the first contact electrode pair 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, it is ensured by the contact distance C that a detected moistening of the belt 8 over the entire working width of the belt 8 is present, which is slightly smaller than a bandwidth E of the belt 8. The contact distance C is smaller than the bandwidth E. The area between the two electrical contacts 21, 22 is retracted by about 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 bar 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 belt 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 voltage of the electrical resistance of the belt 8 is measured, which depends on its humidification. When the belt 8 is wet, the electrical resistance of the belt 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 the nozzle surface 13 is cleaned and then a second resistance measurement is carried out. With the first resistance measurement it is checked whether the band 8 has been properly moistened by the moistening device 15. This avoids that the nozzle surface 13 is brought into contact with a dry belt 8. With the second resistance measurement it is checked whether the moistening device 15 has worked without trouble during the cleaning of the nozzle surface 13 and has not failed. The nozzle surface 13 is highly sensitive and could be damaged if 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 he can check 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. Checking the moisture of the belt 8 before cleaning the pressure beam 1,
  2. 2. Cleaning of the pressure bar 1,
  3. 3. Check moisture of a belt 8 after cleaning of a 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 evaluation electronics of the controller 18.

In bestimmten Fällen, in denen es auf die Zeitersparnis nicht ankommt, kann das zweite Kontaktelektrodenpaar 17 entfallen.In certain cases, in which it does not depend on the time saved, 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.In this case, it is possible to form the electrical contacts 21, 22 of the first pair of contact electrodes 16 as parallel strips, which extend in each case from one to the other end of the pressure bar 1 without interruption, whereby a continuous measurement during cleaning is possible.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Druckbalkenpressure beam
22
Transportpfadtransport path
33
Bedruckstoffsubstrate
44
Transportrichtungtransport direction
55
Reinigungsvorrichtungcleaning device
66
Horizontalführunghorizontal guide
77
Vertikalführungvertical guide
88th
Bandtape
99
Vorratsspulesupply spool
1010
Sammelspulepackaging collector
1111
Vorschubantriebfeed drive
1212
Andrückelementpressing element
1313
Düsenflächedie face
1414
Federungsuspension
1515
Befeuchtungsvorrichtunghumidifying
1616
erstes Kontaktelektrodenpaarfirst contact electrode pair
1717
zweites Kontaktelektrodenpaarsecond contact electrode pair
1818
Steuerungcontrol
1919
Isolatorinsulator
2020
Düsenplattenozzle plate
2121
erster Elektrokontaktfirst electrical contact
2222
zweiter Elektrokontaktsecond electrical contact
2323
PrüfvorrichtungTester
AA
Federwegtravel
BB
Spaltbreitegap width
CC
KontaktabstandContact spacing
DD
Plattenbreiteplate width
Ee
Bandbreitebandwidth

Claims (9)

Druckmaschine, umfassend: - einen Druckbalken (1) für Inkjet, - eine Reinigungsvorrichtung (5) mit einem Band (8) zum Reinigen des Druckbalkens (1) und - eine Prüfvorrichtung (23) zum Prüfen der Feuchtigkeit des Bands (8). Printing machine, comprising: a pressure bar (1) for inkjet, - A cleaning device (5) with a band (8) for cleaning the pressure bar (1) and - A test device (23) for checking the humidity of the belt (8). Druckmaschine nach Anspruch 1,
wobei die Prüfvorrichtung (23) nach dem Prinzip der Widerstandsfeuchtemessung arbeitet.Printing machine according to claim 1,
wherein the test device (23) operates on the principle of resistance moisture measurement. Druckmaschine nach Anspruch 1 oder 2,
wobei die Prüfvorrichtung (23) einen ersten Elektrokontakt (21) und einen zweiten Elektrokontakt (22) aufweist, die am Druckbalken (1) angeordnet sind.Printing machine according to claim 1 or 2,
wherein the test device (23) has a first electrical contact (21) and a second electrical contact (22) which are arranged on the pressure bar (1). Druckmaschine nach Anspruch 3,
wobei der erste Elektrokontakt (21) und der zweite Elektrokontakt (22) voneinander in einem Kontaktabstand (C) platziert sind, der kleiner als eine Bandbreite (E) des Bands (8) ist.Printing machine according to claim 3,
wherein the first electrical contact (21) and the second electrical contact (22) are placed apart from each other at a contact distance (C) that is smaller than a bandwidth (E) of the tape (8). Druckmaschine nach einem der Ansprüche 1 bis 4,
wobei eine Horizontalführung (6) vorhanden ist, die den Druckbalken (1) führt und dabei zuerst den ersten Elektrokontakt (21) und den zweiten Elektrokontakt (22) und danach eine Düsenfläche (13) des Druckbalkens (1) in Kontakt mit dem Band (8) bringt.Printing machine according to one of claims 1 to 4,
wherein a horizontal guide (6) is present, which guides the pressure bar (1) and thereby first the first electrical contact (21) and the second electrical contact (22) and then a nozzle surface (13) of the pressure bar (1) in contact with the tape ( 8) brings. Druckmaschine nach Anspruch 5,
wobei eine X-Y-Führung, die den Druckbalken (1) zur Reinigungsvorrichtung (5) führt, aus der Horizontalführung (6) und einer Vertikalführung (7) besteht.Printing machine according to claim 5,
wherein an XY guide, which guides the pressure bar (1) to the cleaning device (5), consists of the horizontal guide (6) and a vertical guide (7). Druckmaschine nach einem der Ansprüche 1 bis 6,
wobei die Reinigungsvorrichtung (5) eine Befeuchtungsvorrichtung (15) zum Befeuchten des Bands (8) mit Waschmittel aufweist.Printing machine according to one of claims 1 to 6,
wherein the cleaning device (5) comprises a moistening device (15) for moistening the belt (8) with detergent. Druckmaschine nach Anspruch 7,
wobei die Reinigungsvorrichtung (5) eine Vorratsspule (9) für das Band (8) und ein Andrückelement (12) zum Andrücken des Bands (8) an den Druckbalken (1) aufweist und die Befeuchtungsvorrichtung (15) entlang dem Band (8) gesehen zwischen der Vorratsspule (9) und dem Andrückelement (12) angeordnet ist.Printing machine according to claim 7,
wherein the cleaning device (5) has a supply reel (9) for the belt (8) and a pressure element (12) for pressing the belt (8) against the pressure beam (1) and the wetting device (15) along the belt (8) between the supply spool (9) and the pressure element (12) is arranged. Druckmaschine nach einem der Ansprüche 1 bis 8,
wobei eine Steuerung (18) mit einem in ihr ablaufenden Programm vorhanden ist, das die Druckmaschine derart steuert, dass die Prüfvorrichtung (23) die Feuchtigkeit des Bands (8) vor jeder Reinigung des Druckbalkens (1) mit dem Band (8) prüft.Printing machine according to one of claims 1 to 8,
wherein there is a controller (18) having a program running therein that controls the printing press such that the tester (23) checks the moisture of the belt (8) before cleaning the print beam (1) with the belt (8).
EP18199231.4A 2017-11-15 2018-10-09 Printing machine with a pressure beam for ink jet Active EP3486089B1 (en)

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DE102017220343.9A DE102017220343A1 (en) 2017-11-15 2017-11-15 Printing machine with a pressure bar for inkjet

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US20100245466A1 (en) * 2009-03-31 2010-09-30 Hiroshi Inoue Head cleaning method and head cleaning apparatus
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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
JP5472143B2 (en) * 2011-01-31 2014-04-16 ブラザー工業株式会社 Liquid ejection apparatus and program
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

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US20100245466A1 (en) * 2009-03-31 2010-09-30 Hiroshi Inoue Head cleaning method and head cleaning apparatus
EP2492097A1 (en) * 2011-02-24 2012-08-29 Fujifilm Corporation Nozzle surface cleaning device and ink-jet recording device
EP2612758A1 (en) * 2012-01-06 2013-07-10 Fujifilm Corporation Nozzle surface cleaning apparatus and image recording apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021119041A (en) * 2020-01-30 2021-08-12 セイコーエプソン株式会社 Liquid jetting device and maintenance method for liquid jetting device

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DE102017220343A1 (en) 2019-05-16
CN109774311B (en) 2021-07-06
EP3486089B1 (en) 2020-04-08

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