EP2046580A1 - System for controlling operation of the nozzles of a printing head - Google Patents
System for controlling operation of the nozzles of a printing headInfo
- Publication number
- EP2046580A1 EP2046580A1 EP07804662A EP07804662A EP2046580A1 EP 2046580 A1 EP2046580 A1 EP 2046580A1 EP 07804662 A EP07804662 A EP 07804662A EP 07804662 A EP07804662 A EP 07804662A EP 2046580 A1 EP2046580 A1 EP 2046580A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drop
- recording
- printing head
- light beam
- ink
- 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
- 238000007639 printing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 claims description 38
- 238000009792 diffusion process Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007641 inkjet printing Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 230000003797 telogen phase Effects 0.000 claims description 2
- 238000005034 decoration Methods 0.000 claims 2
- 238000004590 computer program Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- B41J2/16579—Detection means therefor, e.g. for nozzle clogging
Definitions
- the present invention concerns the technical field relating to the manufacture of printing- systems which use ink-jet printing heads, the ink-jet printing heads being widely used in various sectors, such as office professional printing, industrial printing and, in particular/ printing on ceramic. Specifically, the invention concerns the technical field regarding systems for controlling the correct operation of printing systems, in particular of nozzles of ink-jet printing heads.
- the object of this invention is to avoid these and other drawbacks, by providing a system for controlling the nozzles of a printing head which allows the working efficiency of the nozzles of the printing head to be controlled before printing and/or periodically, thereby making it possible to act before the problem occurs.
- the advantages deriving from this invention are basically that: damages due to badly working of the nozzles can be avoided before printing, thereby safeguarding the production line from material rejects and expensive machine downtimes for restoring the initial conditions; the controlling station made for this purpose has extremely small dimensions and weight and can be used in existing machines, both in the design phase or added as an important accessory; said controlling station can employ the machine movements to bring the printing heads in a control position; the control operation can be carried out both in a phase of production start of the line and periodically, during the downtimes of the machine to which it is applied, without negatively affecting the hourly production.
- Figure 1 shows a schematic and non-limiting axonometric view of the components of the controlling station.
- Any kind of material having generally a parallelepiped shape, can be used for creating a box structure or housing 1 that is substantially closed, the housing 1 having a top opening through which the ink drop/s 2 ejected by the nozzle/s of the printing head can vertically pass.
- Said boic structure has the function of making it possible to work in a zone that is protected from light.
- the box structure could also be omitted.
- the laser lighting source 3 is positioned on the wall of the box structure perpendicularly to the jet 2,
- the laser lighting source 3 produces a horizontal light beam 4 which, if the printing head nozzles are correctly working, will surely be crossed by the ink drop/s 2.
- This situation is recorded by video camera 5, that is positioned on the same plane as the laser 3, but perpendicularly to the laser 3.
- the light signal produced by diffusion and/or reflection of the light beam 4 on the drop/s 2 crossing said light beam is detected by the video camera S. This allows the efficiency of each single nozzle of the printing head, to be controlled.
- the video camera does not detect any light signal, thereby indicating the presence of a problem to the controlling system.
- the latter possibly interrupts production, thereby avoiding production rejects, and warns the operator of the need to replace or clean and in any case, restore the printing head nozzles to working order.
- Figure 2 shows a side view of the controlling station, which view further highlights the position of the printing head 6, with the ink jet 2 crossing the light beam 4 generated by the laser 3, and the luminous effect of light diffusion which is detected by the video camera 5.
- Figure 3 shows a plan view of the same system, highlighting a possible position (in this example of perpendicularity) between the video camera 5 and the laser 3, which allows optimum signalling of the presence or absence of ink drop/s 2 visible owing to the phenomenon of diffusion of light of the beam 4.
- the invention relates to a system for controlling operation of the nozzles of an ink-jet or similar printing head.
- the system concerned employs the physical phenomenon of light diffusion. If particles are involved, such as aerosol particles, having dimensions ranging from the same order of magnitude of the wavelength of visible light to much larger dimensions, light diffusion is due to different phenomena, such as refraction of rays incident on the surface of particles and reflection by the surface of the particles. Diffraction in particular conditions also produces diffusion.
- the zone adjacent to the printing head nozzle which is intended to be crossed by the drops of ink coming out of the nozzle if the latter works correctly.
- the impact between the light rays and the particles of the ink drops having dimensions greater than the wavelength of said rays leads to diffusion and thus generates a ray of light which can be perceived and detected by a video camera.
- the system concerned does not therefore involve lighting the ink drops to make them visible, but involves causing the ink drops to meet the light beam, so as to originate a diffusion which, in turn, creates a "light" which can be recorded by a video camera or a similar device.
- the recording system such as a video camera, provided in the controlling system, is connected to an electronic processor, such as a sensor, a memory device, a computer or another device, which receives the data sent by the video camera, interprets it and carries out further functions for which it is programmed.
- an electronic processor such as a sensor, a memory device, a computer or another device, which receives the data sent by the video camera, interprets it and carries out further functions for which it is programmed.
- At least one lighting system 3 directed at lighting the zone adjacent to at least one nozzle, said zone being crossed by an ink jet 2 in correct working conditions
- at least one recording system 5 directed at recording the zone adjacent to the at least one nozzle, said zone being crossed by an ink jet 2 in correct working conditions.
- the lighting system 3 generates a light beam 4 which is incident on the plane which must be crossed by the jet 2.
- the incidence of said beam 4 in relation to the zone intended to be crossed by the jet 2 may be of any degree.
- the system cannot work only if the light beam 4 is parallel to the jet 2 and such as not to intersect said jet, even to the slightest extent, since in that case diffusion does not occur .
- said light beam 4 is perpendicular or almost perpendicular to the jet 2.
- the light beam 4 defines a horizontal plane while the jet 2, which drops downwards from the top, draws a vertical line which intersects said plane 4. This reciprocal position is preferable since the drops normally flow out of the nozzle of the printing head 6 and fall vertically.
- the lighting system is advantageously realized by using light sources like LED, LASER, halogen lamp or other sources.
- the light beam is generated by a lighting source consisting of a laser, provided with suitable optics, which generates a lamellar light beam.
- the laser 3 generates a horizontal light beam 4 which makes the jet 2 visible. If there is no jet, because the printing head is clogged, nothing is visible and the recording system will record the absence of this jet. Said laser 3 is perpendicular, or in any case, incident, in relation to the direction of the jet 2,
- the recording system 5 is positioned in such, a way that the light generated by the laser does not strike the recording system 5 » Said recording system must be suitable for recording the effect of the diffusion deriving from the impact between the photons and the ink particles, without receiving the direct light of the light source.
- the lighting source is placed on the same axis and on the same side as the video camera, in such a way that the lighting source and the video camera are one over the other but not parallel .
- said light beam 4 is shown orthogonal with respect to the recording system, but both the light beam 4 and the recording system are on the same plane.
- the recording system 5 is on the same plane on which the light beam 4 is formed or, in any case, on a plane not too distant from the above mentioned plane, so that the video camera can record the effect of diffusion.
- the outlet speed of the drop from the nozzle is high (8-10 m/sec) and an acquisition system based on a video camera having an extremely high acquisition speed would therefore be recjuired. Such a video camera would therefore be much expensive.
- This invention uses a light source consisting of a laser, provided with suitable optics which generates a "blade" of light 4, incident on the zone through which the jet must pass and positioned in such a way as not to strike the video camera frontally. The light source thus does not strike the video camera directly and therefore a dark image is acquired in normal conditions.
- the video camera is programmed so as to have an acquisition time longer than the time required by the drop to pass through the visual field of the video camera.
- the result is the following phenomenon: when the drop passes through the "blade" of light produced by the laser source, a flash of light is produced by diffraction. Such flash of light is detected by the video camera.
- the image acquired by the video camera has a clear dot on a dark background, it is possible to measure the actual production of the drop by the controlled nozzle. If this is not the case, it means that the nozzle has not emitted the jet and is therefore clogged.
- a video camera S is provided, the video camera 5 being connected to a processor suitably programmed for transmitting a signal to a controlling system of the machine, generally a PLC, if the jet 2 is detected, thereby allowing the machine to proceed. If this is not the case, the automatic process can be interrupted and the operator can be requested to act to solve the problem.
- the system comprises a programmed processor connected to the recording system in such a way that once the signal relative to the absence of the jet is received, further control operations, alarm operations or reset operations can be carried out.
- the unclogging procedure can be activated.
- the unclogging procedure can be carried out automatically by the system. After trying to unclog the nozzle, the test is repeated and even if in. this case correct ejection of drops is not detected, an alarm is activated which requires intervention by the operator, in order to proceed with manual unclogging or replacement of the printing head.
- control is carried out in a dark zone and preferably inside a special chamber 1.
- the system can be implemented by means of a controlling device comprising a chamber 1 having: - at least one opening, having shape and dimensions compatible with the shape and dimensions of the printing head, said at least one opening being, at the right moment, at the outlet point at which the ink exits from said nozzle,- - at least one recording system 5 V suitable for recording the zone intended to be crossed by the ink jet 2; at least one lighting system 3 suitable for lighting the zone intended to be crossed by the ink jet 2.
- the nozzle of the printing head is moved until it is positioned near said chamber, preferably above it, but, in any case, in such a way that the ink drop can fall into ⁇ aid opening.
- This movement can be caused directly by the automation mechanism which controls the movement of the printing head to an operating position.
- Said movement may also be a movement of the controlling system which moves , together with the chamber, to arrive under the printing head in such a way as to be able to check its correct operation.
- the recording system such as a video camera, is set up for acquisition for an acquisition time longer than the time taken by the drop to cross the field of vision of the video camera.
- a flash of light is produced by diffraction. This flash of light is detected by the video camera.
- the system provides that a signal is transmitted to a controlling system, generally a PLC or a suitably programmed processor which controls the continuation of the printing process.
- a controlling system generally a PLC or a suitably programmed processor which controls the continuation of the printing process.
- the system provides that an alarm signal is emitted
- the system envisages that a signal is transmitted to a controlling system, generally a PLC or a suitably programmed processor which makes it possible to carry out the interruption of the printing process and /or the unclogging procedure and/or any other operation that may be useful or necessary.
- a controlling system generally a PLC or a suitably programmed processor which makes it possible to carry out the interruption of the printing process and /or the unclogging procedure and/or any other operation that may be useful or necessary.
- the test is repeated, and if correct ejection of drops is not detected even in this case, an alarm is activated which requires intervention by the operator, in order to proceed with manual unclogging or replacement of the printing head.
- the control is carried out in a dark area and preferably inside a special chamber 1.
- a device for controlling operation of at least one nozzle, preferably more than one, of a printing head comprises a box structure 1 having a top opening through which the jet 2 of ink drops passes, at least one lighting source 3 and at least one recording system 5.
- said opening is kept closed in the rest phase so that no dust or other residue can enter the box structure, and it is opened only near the printing head when operation is to be controlled.
- the controlling station in which the controlling system and/or the controlling device i works is located at any point of the production line in such a way that the printing head is positioned above said point, emits the jet of ink drops and proceeds with the operation, In an embodiment, the printing head is moved so as to be positioned above the above mentioned controlling station and/or device.
- controlling station and/or device are movable and are positioned below the printing head.
- the invention further comprises a method which makes it possible to implement parts of the functions provided for by the system.
- the method comprises at least the following steps s - checking the detection of at least one ink drop by the recording system; if the result is positive, transmitting a signal to a controlling system, generally a PLC or a suitably programmed processor, which allows continuation of the printing process.
- a controlling system generally a PLC or a suitably programmed processor
- the method also provides the following steps, carried out alone or in addition to the previous steps: checking the detection of at least one ink drop by the recording system,- if the result is negative, emitting at least one alarm signal.
- the method further comprises the following steps: checking the detection of at least one ink drop by the recording system; if the result is negative, transmitting at least one signal to a controlling system, generally a PLC or a suitably programmed processor which makes it possible to interrupt the printing process and /or to activate the unclogging procedure and/or to carry out any other poeration that may be useful or necessary.
- the method also provides the following step: trying to clear the clogged nozzle and repeating the controlling procedure, and possibly emitting an alarm or other signal, if the controlling procedure is negative.
- the invention comprises a program for an electronic processor suitable for carrying out one or more of the above mentioned steps.
- the invention also comprises an electronic processor programmed for carrying out one or more of the steps of the method described above.
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000098A ITPI20060098A1 (en) | 2006-07-28 | 2006-07-28 | CONTROL SYSTEM OF THE FUNCTIONALITY OF THE NOZZLES OF A PRINT HEAD. |
PCT/IB2007/002162 WO2008012671A1 (en) | 2006-07-28 | 2007-07-27 | System for controlling operation of the nozzles of a printing head |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2046580A1 true EP2046580A1 (en) | 2009-04-15 |
EP2046580B1 EP2046580B1 (en) | 2011-06-15 |
Family
ID=38728875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07804662A Active EP2046580B1 (en) | 2006-07-28 | 2007-07-27 | Apparatus and method for controlling an ink-jet printing head through detection of light diffusion |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2046580B1 (en) |
AT (1) | ATE512797T1 (en) |
ES (1) | ES2365362T3 (en) |
IT (1) | ITPI20060098A1 (en) |
WO (1) | WO2008012671A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102120952B1 (en) * | 2018-07-04 | 2020-06-09 | 세메스 주식회사 | Apparatus for detecting liquid discharge characteristics |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5967061A (en) | 1982-10-07 | 1984-04-16 | Fuji Xerox Co Ltd | Method and apparatus for detection of deflecting amount of ink jet |
US5276467A (en) * | 1992-05-04 | 1994-01-04 | Hewlett-Packard Company | Alignment system for multiple color pen cartridges |
DE4226753A1 (en) | 1992-08-13 | 1994-02-17 | Basf Ag | Preparations containing active substances in the form of solid particles |
DE69931134T2 (en) | 1999-02-12 | 2007-04-19 | Hewlett-Packard Development Company, L.P., Houston | Method for ink drop detection in a printing device |
US20060071957A1 (en) | 2004-10-05 | 2006-04-06 | Applied Materials, Inc. | Droplet visualization of inkjetting |
-
2006
- 2006-07-28 IT IT000098A patent/ITPI20060098A1/en unknown
-
2007
- 2007-07-27 EP EP07804662A patent/EP2046580B1/en active Active
- 2007-07-27 WO PCT/IB2007/002162 patent/WO2008012671A1/en active Application Filing
- 2007-07-27 AT AT07804662T patent/ATE512797T1/en not_active IP Right Cessation
- 2007-07-27 ES ES07804662T patent/ES2365362T3/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008012671A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2046580B1 (en) | 2011-06-15 |
WO2008012671A1 (en) | 2008-01-31 |
ITPI20060098A1 (en) | 2008-01-29 |
ATE512797T1 (en) | 2011-07-15 |
ES2365362T3 (en) | 2011-09-30 |
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