EP4422873A1 - Druckvorrichtung zum bedrucken eines werkstücks sowie verfahren - Google Patents
Druckvorrichtung zum bedrucken eines werkstücks sowie verfahrenInfo
- Publication number
- EP4422873A1 EP4422873A1 EP22812536.5A EP22812536A EP4422873A1 EP 4422873 A1 EP4422873 A1 EP 4422873A1 EP 22812536 A EP22812536 A EP 22812536A EP 4422873 A1 EP4422873 A1 EP 4422873A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- unit
- recording medium
- workpiece
- printing device
- 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
Links
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
- 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
-
- 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
- B41J2/16579—Detection means therefor, e.g. for nozzle clogging
-
- 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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
Definitions
- Printing device for printing a workpiece
- the invention relates to a printing device for printing a workpiece, a machine with such a printing device and a corresponding method.
- a workpiece is, in particular, a plate-shaped workpiece that consists, for example, at least partially of wood, wood materials.
- a test print can be carried out with a conventional printer, the result of which is scanned and subsequently evaluated.
- an inkjet printing device is used on an industrial scale for printing a panel-shaped workpiece, checking by means of a test print on a workpiece has turned out to be relatively uneconomical or not very practical, because compared to printing on paper with a panel-shaped workpiece, the associated higher costs.
- a test print can only be carried out to a limited extent, because the height of the narrow surface to be printed depends on the thickness of the panel-shaped workpiece.
- the thickness of a plate-shaped workpiece can vary depending on the workpiece and the type of machine, so that the full functionality of a printing device only provides reliable information when printing on a workpiece with maximum thickness.
- workpieces are printed whose thickness is less than the maximum area that can be printed with the printing device. Appropriate workpieces would therefore have to be kept available for a test print.
- the subject-matter of claim 1 provides a corresponding printing device. Further preferred embodiments are listed in the dependent claims.
- the invention proposes a machine with a printing device and a method, wherein a printing device according to one of the aforementioned aspects can be used in the course of the method.
- the printing device is provided for printing a workpiece, in particular a panel-shaped workpiece (made of wood or a wood-based material) and comprises: a printing unit with at least one print head for printing a surface (e.g. a narrow surface) of the workpiece, and a control unit with a recording medium, the printing unit is set up to print on the recording medium or on a medium held on the recording medium.
- control unit it is thus possible with the control unit to check the full functionality of the printing device without printing a workpiece or preparing a workpiece for this purpose. Furthermore, the printing unit, in particular the opening(s)/nozzle(s) of the printing unit, can be checked independently of a possible workpiece dimension, in particular workpiece thickness.
- the recording medium or the medium held by the recording medium can be paper, for example paper on a roll (such as a fax roll, cash register roll or the like), a foil, a glass pane, a PTFE-coated material, or the like.
- control unit has a detection unit which is set up to detect the section printed on the recording medium or on the medium held by the recording medium.
- a monitoring of the quality of the printing carried out with the printing unit can be digitized, so that a software-side analysis can be performed. It is also possible to use the result of the assessment carried out with the detection unit for other control or regulation processes.
- the printing device is designed in such a way that the printing unit has a pivot axis about which the at least one print head can be pivoted.
- the at least one print head which in the case of an inkjet print head has a large number of openings for ejecting a printing substance, can thus be pivoted from an operating position into a control position or a maintenance position.
- aligning the printing unit in such a way that openings in the print head for ejecting the print medium point downwards in the vertical direction is advantageous for checking and/or for cleaning.
- Printing on a narrow side of a plate-shaped workpiece on the other hand, preferably takes place in an orientation of the printing unit in which the openings of the print head for ejecting the print medium point in a horizontal direction.
- the printing unit is arranged such that the openings of the print head for ejecting the print medium face downwards or upwards in a vertical direction.
- control position and the maintenance position are preferred different positions of the printing unit. However, it can also be the case that the control position and the maintenance position are the same position of the printing unit, with the printing unit printing the recording medium or a medium held on the recording medium in the control position, and in the maintenance position, in after the recording medium has been removed, the printing unit is cleaned.
- an opening of a print head of the printing unit faces downward in the vertical direction in the maintenance position.
- an opening of a print head of the printing unit in the maintenance position can also be oriented in an orientation inclined to the vertical direction or in a horizontal direction.
- the printing device has a guide, in particular a linear guide, along which the printing unit can be moved.
- the printing unit can thus be moved in a horizontal direction, for example.
- the printing device has a cleaning unit for cleaning the printing unit.
- the cleaning unit comprises an ink collection system (e.g. a tub with a drain into a container) and/or a suction device for flushing the opening(s) of the printing unit.
- the cleaning unit can be advanced in the direction of the printing unit. Additionally or alternatively, the cleaning unit can have a unit for wiping the opening(s) of the printing unit.
- the cleaning unit can also be designed in such a way that the cleaning unit covers the opening(s) of the printing unit in order to protect it from light and dust when it is at a standstill.
- the recording medium is a sheet-like element, it being preferred that the recording medium can be unwound from a roller.
- the recording medium can be moved relative to the printing unit and, after applying a printed section, are guided into the area of the detection unit.
- the recording medium is plate-shaped and can be moved by means of a drive, in particular a linear drive.
- a drive in particular a linear drive.
- the printing device also preferably includes a control device that is set up to release the printing unit based on the detection result of the detection unit. If the detection unit detects that further cleaning of the printing unit, in particular of the one or more print heads, needs to be carried out, cleaning of the printing unit can be initiated.
- the detection unit has a CCD sensor, a CMOS sensor and/or a camera system.
- a CMOS sensor has the advantage over a CCD sensor of comparatively high frame rates and higher image quality. In contrast, the CCD sensor is less expensive.
- a camera system can interface with an image processing program to perform a detailed assessment.
- control unit (and/or the cleaning unit) is (are) movable such that the printing unit can be printed in one position with the control unit on a recording medium or on a medium held on the recording medium (and/or the printing unit can be cleaned in one position) .
- control unit and/or the cleaning unit
- the control unit can be moved from a rest position to a working position and vice versa. A compact arrangement of the printing device is thus provided.
- control unit and/or the cleaning unit is/are provided on a sliding device which is actuated in order to move the control unit (and/or the cleaning unit) from the rest position to the working position and vice versa.
- the sliding device can be actuated by a motor, pneumatically or manually. In the rest position of the control unit and/or the cleaning unit, a specific alignment or arrangement of the printing unit can be made possible without having to fear a collision of the printing unit with the control unit and/or the cleaning unit.
- the sliding device can be moved in a translatory, preferably horizontal, direction in order to move the control unit and/or the cleaning unit from the rest position to the working position and vice versa. This can be done in a similar way to moving a drawer.
- a machine for processing workpieces comprising a device for applying a strip-shaped coating to the workpiece and a printing device according to one of the preceding aspects.
- such a machine can be a conveyor device for moving the workpiece, in particular a belt conveyor. So can particularly large quantities are processed with the machine.
- a recording medium or a medium held on the recording medium can be printed independently of the machine feed.
- the machine can have a control device that is set up to request the machine operator, in the event of a long downtime, to print a recording medium or a medium held on the recording medium.
- a control device that is set up to request the machine operator, in the event of a long downtime, to print a recording medium or a medium held on the recording medium.
- Such printing can be started manually or carried out within the framework of a defined time interval, recording a longer idle time or the like.
- a method for printing a, in particular plate-shaped, workpiece comprising the steps: bring about a relative movement between a printing unit and the workpiece, printing a surface, in particular a narrow surface, of the workpiece with the printing unit (preferably cleaning the printing unit by means of a cleaning unit , ) and printing on a recording medium or a medium held on the recording medium .
- QR code QR code
- barcode barcode
- z information such as z.
- Fig. 1 shows a schematic cross-sectional view of a printing device according to an embodiment of the invention.
- Fig. 2 shows a front view of a control unit according to a first embodiment.
- Fig. 3a shows a side view of a control unit according to a second embodiment.
- Fig. 3b shows a front view of the control unit according to a second embodiment.
- a machine 150 which includes a printing device 100 , has a housing 151 and a machine bed 152 .
- the housing 151 is designed in such a way that workpieces processed with the printing device 100 at least partially reach an inner region of the housing 151 .
- the machine 150 comprises a belt conveyor 153 (conveyor device), it also being possible for other conveyor mechanisms to be provided according to further embodiments.
- the belt conveyor 153 includes a circulating conveyor 153a and is provided in a peripheral portion of the housing 151 and arranged such that a portion of a workpiece moved by the belt conveyor 153 rests on the conveyor 153a.
- An upper pressure 154 is provided in the vertical direction above the belt conveyor 153 so that a plate-shaped workpiece (not shown) can be moved by the belt conveyor 153 and can be held by the upper pressure 154 in the process.
- the top pressure 154 comprises a multiplicity of rollers, but the top pressure 154 can also, for example, comprise a revolving belt or the like.
- the printing device 100 comprises a printing unit 10 which, according to the embodiment, is designed as an ink et printing device and has a large number of print heads 10a, 10b, 10c, 10d.
- the printing unit 10 is shown in FIG. 1 in a maintenance position (also called “service position”) B2, in which the print heads 10a, 10b, 10c, 10d are arranged next to one another in a substantially horizontal direction.
- the print heads 10a, 10b, 10c, 10d are located next to one another in a hori zontal direction, so that workpieces of different thicknesses, which have correspondingly different dimensions of a narrow surface, can be printed.
- the printing unit 10 is pivoted about a hori zontal axis.
- the printing unit 10 can assume both an operating position B1, in which the printing unit 10 is arranged for printing a narrow surface of a plate-shaped workpiece, and the maintenance position B2, in which the printing unit 10 is pivoted to clean the print heads.
- individual openings in the print heads 10a, 10b, 10c, 10d are controlled in such a way that those openings which are opposite the narrow surface of the moving workpiece are actuated, whereas other openings which are outside of the area to be printed on the respective narrow surface remain closed.
- the printing device 100 also includes a cleaning unit 20 which is located vertically below the printing unit 10 and which is dimensioned such that the print heads of the printing unit 10 can be cleaned in the maintenance position B2.
- the cleaning unit 20 comprises a trough (ink collection system) which can be moved in the vertical direction and which can be moved in the direction of the printing unit 10 in order to clean the print heads.
- a trough in the vertical direction and which can be moved in the direction of the printing unit 10 in order to clean the print heads. This allows the cleaning unit to cover the openings to protect them from light and dust when the machine is at a standstill. If the cleaning unit 20 has been delivered to the printing unit 10 , the print heads can be cleaned, in particular flushed.
- the cleaning unit can have a suction device and/or a unit for wiping the opening(s) of the printing unit.
- the printing unit 10 can be moved along a guide 15 , the guide 15 extending in a substantially horizontal direction transverse to the conveying direction of the workpieces.
- a control unit 30 is provided adjacent to the cleaning unit 20, with which a test print can be carried out and checked accordingly.
- the printing unit 10 is moved along the guide 15 and arranged in the area of the control unit 30.
- the As in the maintenance position B2, print heads 10a, 10b, 10c, 10d of the printing unit 10 are also arranged next to one another in a substantially horizontal direction in the control position B3.
- the printing unit 10 can be pivoted in such a way that the print heads 10a, 10b, 10c, 10d of the printing unit 10 point in a different direction than in the operating position Bl .
- inspection position B4 Such an arrangement of the printing unit 10 is referred to as inspection position B4.
- the printing unit 10 can be inspected visually in the inspection position B4.
- the housing 101 of the printing device 100 has a window (not shown in FIG. 1) so that an operator of the printing device 100 can view the printing unit 10 accordingly.
- a camera can be provided in the housing 101, with which the printing unit 10 can be recorded and viewed by an operator, for example on an operating panel of the printing device 100.
- the control unit 30 includes a detection unit 31 and a recording medium 32 .
- the recording medium 32 can be unwound from a first roller 33 and can be received by a second roller 34 .
- a support section 35 on which the recording medium 32 rests extends between the first roller 33 and the second roller 34 .
- the detection unit 31 includes in particular a CCD sensor or a CMOS sensor. Furthermore, the detection unit 31 can be designed as a camera system. The information recorded with the detection unit 31 can be evaluated with a computer program.
- the control unit 30 is set up in such a way that the print heads 10a, 10b, 10c, 10d of the printing unit 10 carry out a respective test print on the recording medium 32 (or a recording medium held by the recording medium 32) and the recording medium 32 is then detected by the detection unit 31 can be.
- the recording medium 32 is guided along a detection area of the detection unit 31, starting from an area below the print heads 10a, 10b, 10c, 10d of the printing unit 10, so that the printed recording medium 32 enters the area of the detection unit 31 arrived.
- QR code e.g. A QR code
- barcode e.g. B. Date, time, printed linear meters, age of the ink, last cleaning and/or next maintenance, wear and tear of the printing unit (in particular opening(s)/nozzle(s) of the printing unit).
- control unit 30′ comprises a detection unit 31′, which, like in the first embodiment, can comprise a CCD sensor, a CMOS sensor and/or a camera system.
- control unit 30' comprises a disc-shaped recording medium 32' and a linear drive 33' with which the recording medium 32' can be moved.
- a recording medium 32a' can be arranged on the recording medium 32', or the recording medium 32' itself serves as a recording medium.
- the recording medium 32' can be moved along the print heads after the linear drive 33' is moved . In this way, nozzle availability can be checked in a position provided in the vertical direction below the print heads.
- the cleaning unit and the control unit are arranged adjacent to one another, it can be provided according to a modification that the cleaning unit and/or the control unit is/are moved in such a way that the printing unit is cleaned in one position and the control unit can be used to print a recording medium or a medium held on the recording medium.
- control unit and/or the cleaning unit is/are provided on a sliding device which is actuated in order to move the control unit (and/or the cleaning unit) from the rest position to the working position and vice versa.
- a sliding device which is actuated in order to move the control unit (and/or the cleaning unit) from the rest position to the working position and vice versa.
- the movement of such a sliding device can be performed in a horizontal direction similar to a movement of a drawer.
- the sliding device can be actuated by a motor or manually.
- a specific alignment or arrangement of the printing unit can be made possible without having to fear a collision of the printing unit with the control unit and/or the cleaning unit.
- a concrete procedure according to this modification is as follows:
- Control unit is arranged under pressure unit if necessary. Snapping the control unit into place on the printing unit Printing on a recording medium or a medium held on the recording medium.
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Ink Jet (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021128270.5A DE102021128270A1 (de) | 2021-10-29 | 2021-10-29 | Druckvorrichtung zum Bedrucken eines Werkstücks sowie Verfahren |
| PCT/EP2022/080071 WO2023073096A1 (de) | 2021-10-29 | 2022-10-27 | Druckvorrichtung zum bedrucken eines werkstücks sowie verfahren |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4422873A1 true EP4422873A1 (de) | 2024-09-04 |
| EP4422873B1 EP4422873B1 (de) | 2025-12-03 |
Family
ID=84362245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22812536.5A Active EP4422873B1 (de) | 2021-10-29 | 2022-10-27 | Druckvorrichtung zum bedrucken eines werkstücks sowie verfahren |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4422873B1 (de) |
| CN (1) | CN118159426A (de) |
| DE (1) | DE102021128270A1 (de) |
| WO (1) | WO2023073096A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL2065206T3 (pl) | 2006-03-08 | 2011-05-31 | Homag Holzbearbeitungssysteme Ag | Urządzenie do uszlachetniania detali |
| DE102010008295A1 (de) | 2010-02-17 | 2011-08-18 | Dieffenbacher System Automation GmbH, 75031 | Vorrichtung und Verfahren zum Bedrucken von Oberflächen von Werkstoffplatten, insbesondere Holzplatten, mit einer mehrfarbigen Abbildung |
| IT201600098327A1 (it) | 2016-09-30 | 2018-03-30 | Omso Officina Macchine Per Stampa Su Oggetti Spa | Macchina per la stampa a getto d'inchiostro di oggetti tridimensionali, in particolare di oggetti tubolari |
-
2021
- 2021-10-29 DE DE102021128270.5A patent/DE102021128270A1/de active Pending
-
2022
- 2022-10-27 WO PCT/EP2022/080071 patent/WO2023073096A1/de not_active Ceased
- 2022-10-27 CN CN202280072474.XA patent/CN118159426A/zh active Pending
- 2022-10-27 EP EP22812536.5A patent/EP4422873B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN118159426A (zh) | 2024-06-07 |
| DE102021128270A1 (de) | 2023-05-04 |
| EP4422873B1 (de) | 2025-12-03 |
| WO2023073096A1 (de) | 2023-05-04 |
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