EP1803570B1 - Dispositif à jet d'encre ayant un dispositif de purge - Google Patents
Dispositif à jet d'encre ayant un dispositif de purge Download PDFInfo
- Publication number
- EP1803570B1 EP1803570B1 EP20060123161 EP06123161A EP1803570B1 EP 1803570 B1 EP1803570 B1 EP 1803570B1 EP 20060123161 EP20060123161 EP 20060123161 EP 06123161 A EP06123161 A EP 06123161A EP 1803570 B1 EP1803570 B1 EP 1803570B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- valve
- reservoir
- supply line
- ink reservoir
- 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
Links
- 238000010926 purge Methods 0.000 title claims description 42
- 238000007639 printing Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 17
- 230000005484 gravity Effects 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000012943 hotmelt Substances 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000007641 inkjet printing Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 241000272525 Anas platyrhynchos Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
Images
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
- B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
- B41J2/16526—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head by applying pressure only
-
- 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
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17596—Ink pumps, ink valves
Definitions
- the invention relates to an ink jet device comprising an ink reservoir and a jetting assembly having at least one printing nozzle.
- the ink reservoir is usually arranged together with the jetting assembly in a printhead which is reciprocated over a printing area.
- the printhead usually has an ink supply line for supplying ink to the ink reservoir.
- the ink supply line may comprise an ink melting unit for supplying melted ink to the ink reservoir, and solid ink pellets may be supplied to an open end of the ink melting unit from outside the printhead from time to time.
- an ink filter may be provided at the ink supply line, and the melted ink may be flow through the ink filter into the ink reservoir.
- the ink filter may function as a hydraulic lock, so that the negative pressure can be provided to the ink reservoir while at the same time ink may be supplied to the ink reservoir through the ink filter.
- a purging device may be provided that is adapted to apply a purging pressure to the inner space of the reservoir for pressing ink into the printing nozzles.
- the ink supply line has to be shut off from the ink reservoir to permit the purging device to build up the purging pressure in the ink reservoir.
- the necessary purging pressure is usually higher than the absolute value of the negative pressure which is applied to the ink reservoir for preventing ink from leaking ink out of the printing nozzles.
- the ink filter may not function as a hydraulic lock under the comparatively high purging pressure.
- a break-through of the ink filter i.e. an undesired flow of air or ink from the ink reservoir through the ink filter, may take place.
- the necessary purging pressure cannot be built up within the ink reservoir.
- an ink jet apparatus corresponding to the preamble of claim 1 is known.
- the ink jet apparatus has a tilt valve that is positioned at an upper wall of the ink reservoir. Hot melt ink is melted in an ink melting unit and flows through the tilt valve into the ink reservoir due to gravity.
- the tilt valve is moved in a closed position by an actuator.
- the tilt valve has to be closed actively in order to enable the ink jet priming system to build up a purging pressure within the ink reservoir.
- the necessary actuator for closing the valve and the moving parts of the valve which are arranged at the ink supply line are disadvantageous.
- valve is opened by the gravity force of the melted ink as the opening of the valve may be suppressed by capillary forces, i.e. adhesion between the valve element, the liquid ink and the top wall of the reservoir. In such a case, the ink supply line will be blocked.
- a hot melt ink jet printhead having an ink reservoir with a first chamber and a second chamber.
- the second chamber comprises a first valve and a second valve.
- ink flows from the first chamber to a nozzle head of the printhead.
- a channel between the first chamber and the second chamber is closed, and a channel between the nozzle head and the second chamber is opened.
- ink flows from the first chamber through the nozzle head into the second chamber. Thereby, any air bubbles present in the nozzle head are moved into the second chamber.
- ink is allowed to flow from the second chamber to the first chamber.
- valves are arranged at opposite arms of a lever to be alternately closed by a movement of the lever.
- the lever is activated by an actuating mechanism.
- a disadvantage is that always one of the valves is in a closed position, so that during printing the ink is not circulated in the chamber between the nozzle head and the second chamber. Moreover, the valves do not shut off the ink supply line from the ink reservoir.
- an ink jet printing system wherein a liquid ink supply line extending from a remote liquid ink reservoir to an ink reservoir of a printhead is shut off by a passive check valve.
- the check valve is spring-biased toward its closed position.
- the ink reservoir of the printhead may be elevated above the remote reservoir, and ink is supplied through the check valve to the ink reservoir by a pump, thereby opening the check valve.
- a pressure control system controls the pressure of the ink in the ink reservoir of the printhead to permit purging of air bubbles and contaminants from orifices and passageways.
- a disadvantage of this ink jet printing system is that a pump is necessary to actively pump the ink through the check valve in the ink supply line.
- US-A-4 937 598 discloses an ink jet printing system which includes a purge system.
- the ink enters from the supply line into the ink reservoir from below, passing a check-valve that closes when the purge system pressurizes the ink reservoir.
- the purge system pressurizes the ink reservoir.
- the ink has to be urged into the ink reservoir against the force of gravity.
- an ink jet device comprising an ink reservoir, and a jetting assembly having at least one printing nozzle, the jetting assembly being connected to the ink reservoir for receiving liquid ink from the ink reservoir
- the ink jet device further comprising an ink supply line for supplying ink to the ink reservoir, said ink supply line comprising a valve for blocking a connection of the ink supply line to the ink reservoir, said valve being arranged at a lower end of the ink supply line, the ink supply line and the ink reservoir being arranged to allow liquid ink to flow through the valve into the ink reservoir in accordance with and supported by gravity acting on the ink
- the ink jet device further comprising a purging device adapted to apply a purging pressure to an inner space of the ink reservoir for pressing ink into the at least one printing nozzle, wherein the valve is arranged below a nominal minimal fill level of the ink reservoir, and the valve is a passive one-way valve that is adapted to block the connection of the ink
- This predetermined pressure value may be a value between the set value of the pressure to be applied to the ink reservoir during printing and the purging pressure set value. Due to the valve, the ink supply line can be reliably shut off from the ink reservoir during the purging operation, so that the purging pressure can be built up within the ink reservoir. Moreover, because the valve is a passive valve that closes when a pressure within the ink reservoir is high enough, wherein said high enough pressure is not required to be higher than the purging pressure, the valve automatically closes when the purging pressure is built up. Therefore, an actuator for closing the valve can be dispensed with. Moreover, a reliable opening of the valve is achieved for the following reasons.
- the valve is arranged below a nominal minimal fill level of the ink reservoir, the valve is surrounded by the ink of the ink reservoir and by the ink that is present within the ink supply line. Therefore, there will be no capillary adhesion forces that could prevent the valve from opening. Therefore, the valve may be adapted to be opened due to or supported by gravity forces acting on ink which is present in the ink supply line. Furthermore, the valve preferably comprises a valve element which has a greater mass than the ink which it displaces. Thus, the opening of the valve is also supported by gravity acting on the valve element.
- a pump may be dispensed with. This facilitates a simple construction of the ink jet device.
- the ink supply line further comprises an ink filter, the valve being arranged between the ink filter and the ink reservoir.
- the valve of the invention is extremely useful to prevent an ink filter break-through due to the purging pressure.
- the only ink path into the ink reservoir is through the ink filter, and, following the ink filter, through the valve.
- the ink filter is arranged above the ink reservoir.
- the ink supply line further comprises a sub chamber which is arranged between the ink filter and the valve. Thereby, a gravity force acting on ink which is present within the sub chamber contributes to opening the valve.
- the ink supply line further comprises an ink melting unit for supplying melted ink through the ink filter to the ink reservoir.
- the ink jet device comprises a suction device which is adapted to apply a negative pressure to said inner space of the ink reservoir.
- a suction device which is adapted to apply a negative pressure to said inner space of the ink reservoir.
- ink may be prevented from leaking off the printing nozzle.
- the ink filter is provided at the ink supply line, the ink filter preferably functions as a hydraulic lock, so that the negative pressure may be applied while still allowing liquid ink to be supplied to the ink reservoir through the filter.
- the valve is adapted to be continuously open during a printing operation of the ink jet device and is adapted to be closed by the purging pressure being applied to said inner space of the ink reservoir.
- the valve comprises a spherical valve element, a cage and a valve seat for the valve element, the valve element being freely movable between the valve seat and the cage, the mass of the valve element being greater than the mass of the liquid ink which is displaced by the valve element.
- the valve is adapted to be closed when the valve element is pressed against the valve seat.
- the valve may be a duck bill valve.
- the cage forms a diffuser for ink which flows through the valve into the ink reservoir. Thereby, a circulation of the liquid ink within the ink reservoir is facilitated.
- the ink supply line further comprises a vertical tube, the valve seat being arranged at an inner wall of said tube, the tube surrounding at least an upper half of the valve element when the valve element is pressed against the valve seat.
- Figures 1 to 3 show an ink jet device with a jetting assembly 10 forming a lower part thereof.
- An array of printing nozzles 12 is arranged at the jetting assembly 10 to eject ink droplets in a vertical direction.
- one of the printing nozzles 12 is shown, and ink droplets 14 are indicated.
- the jetting assembly 10 is connected via a filter 16 to an inner space 18 of an ink reservoir 20.
- the ink reservoir 20 is normally filled with liquid hot-melt ink 22 at least to a nominal minimal fill level L indicated with a chain-dotted line.
- An electric heating device 24 is arranged in a manner which is generally known in the art at the ink reservoir 20 to keep the hot-melt ink 22 in its liquid state.
- a fill level sensor 26 is arranged at a wall of the ink reservoir 20 to detect whether the actual ink fill level within the ink reservoir 20 sinks to nearly the nominal minimal fill level L, like it is shown in figures 1 and 2 . In this case, new liquid ink is supplied to the inner space 18 of the ink reservoir 20 via an ink supply line 28. In figure 3 , an actual fill level is shown that is higher than the actual fill level shown in figures 1 and 2 .
- an ink melting unit 30 of the ink supply line 28 there is arranged an ink melting unit 30 of the ink supply line 28. Solid ink pellets are supplied to the ink melting unit 30 when needed.
- an electric heating device 32 for melting an ink pellet which is present in the ink melting unit 30.
- the ink melting unit 30 forms a funnel which opens at its lower end into a first sub chamber 34 of the ink reservoir 20.
- the first sub chamber 34 extents substantially over the cross sectional area of the ink reservoir 20. It has a lower wall which is formed by an ink filter 36 which connects the first sub chamber 34 to a second sub chamber 38 which is arranged below the ink filter 36.
- the upper part of the second sub chamber 38 forms a funnel which is connected to a vertical tube 40 that forms the lower part of the second sub chamber 38.
- the ink supply line 28 is connected to the inner space 18 of the ink reservoir 20 via a valve 42 which will now be described in detail.
- the inner wall of the vertical tube 40 forms a valve seat 44 for a ball which forms a spherical valve element 46.
- the vertical tube 40 forms a valve opening 48.
- the spherical valve element 46 is pressed against the valve seat 44 by a pressure within the ink reservoir 20 and thereby closes the valve opening 48.
- the connection of the ink supply line 28 to the ink reservoir 20 is blocked. This state is shown in figure 3 .
- valve element 46 is held by a cage 50 which is arranged at the lower end of the vertical tube 40.
- the valve element 46 is free to move between the cage 50 and the valve seat 44. Since the valve element 46 has a greater mass than the ink which it displaces, the valve element 46 will usually rest on the cage 50 in the open position of the valve 42. Thereby, the influence of the valve 42 onto the ink flow into the ink reservoir 20 is minimized.
- the vertical tube 40 is arranged to surround at least an upper half of the spherical valve element 46 in the open position of the valve 42.
- An ink flow from the ink supply line 28 through the open valve 42 into the ink reservoir is divided by the cage 50 into at least two branches.
- the cage 50 forms a diffuser for the ink flow.
- the ink enters into the inner space 18 of the ink reservoir 20 in at least two different directions.
- a circulation of the ink 22 within the ink reservoir 20 is achieved.
- the ink flows through openings between the cage 50 and the vertical tube 40 at two opposite sides of the valve 42, namely, to the left and to the right of the vertical tube 40 in figure 1 .
- the ventilation conduit 52 is, for example, formed by a flexible hose.
- the ventilation conduit 52 connects the inner space 18 of the ink reservoir 20 via an air filter 54 to a combined suction and purging device 56.
- the combined suction and purging device 56 applies a negative pressure via the ventilation conduit 52 to the inner space 18.
- liquid ink 22 is prevented from leaking through the printing nozzles 12 of the jetting assembly 10.
- the ink filter 36 of the ink supply line 28 functions as a hydraulic lock because capillary channels of the ink filter 36 are filled with ink.
- the negative pressure can be maintained within the inner space 18 of the ink reservoir 20.
- the valve 42 is continuously open.
- the combined suction and purging device 56 exerts a higher positive pressure to the inner space 18 of the ink reservoir 20. This is called the purging pressure.
- the purging pressure is applied to the ink reservoir 20
- the valve element 46 is pressed against the valve seat 44 and thus, the valve 42 is closed. Thereby, the connection of the ink supply line 28 to the ink reservoir 20 is locked.
- the ink filter 36 does not interfere with the building up of the purging pressure within the inner space 18 of the ink reservoir 20. In particular, a break-through of the ink filter 36 is prevented.
- the combined suction and purging device 56 may again apply a negative pressure to the inner space 18 of the ink reservoir 20. Due to gravity acting on ink within the vertically tube 40 and due to the negative pressure within the ink reservoir 20, the valve element 46 experiences a force that moves the valve element 46 downward. Because the valve element 46 is arranged below the nominal minimal fill level L, it is surrounded by liquid ink 22 in the closed position of the valve 42. Thereby, capillary adhesion forces are prevented from occurring between the valve element 46 and the valve seat 44. Therefore, after a purging operation the valve 42 reliably opens.
- valve 42 functions as a passive one-way valve that reliably blocks the connection of the ink supply line 28 to the ink reservoir 20 when the purging pressure is applied to the ink reservoir and reliably opens again when the pressure within the ink reservoir is at its normal level during a printing operation.
Landscapes
- Ink Jet (AREA)
Claims (10)
- Dispositif à jet d'encre comprenant un réservoir d'encre (20) et un ensemble d'éjection (10) comportant au moins une buse d'impression (12), l'ensemble d'éjection (10) étant raccordé au réservoir d'encre (20), afin de recevoir l'encre liquide (22) du réservoir d'encre (20),
comprenant en outre une ligne d'alimentation en encre (28) destinée à alimenter le réservoir d'encre (20) en encre, laquelle ligne d'alimentation en encre (28) comprend une soupape (42) destinée à bloquer un raccordement de la ligne d'alimentation en encre (28) au réservoir d'encre (20), laquelle soupape (42) est placée au niveau d'une extrémité inférieure de la ligne d'alimentation en encre (28), laquelle ligne d'alimentation en encre (28) et le réservoir d'encre (20) étant configurés pour laisser l'encre liquide (22) s'écouler à travers la soupape (42) dans le réservoir d'encre (20) conformément à et supportée par la gravité agissant sur l'encre,
comprenant en outre un dispositif de purge (56) conçu pour appliquer une pression de purge à un espace intérieur (18) du réservoir d'encre (20), afin de comprimer l'encre (22) dans la ou les buse(s) d'impression (12),
caractérisé en ce que la soupape (42) est placée en dessous d'un niveau de remplissage minimal nominal (L) du réservoir d'encre (20),
et en ce que la soupape (42) est une soupape passive à une voie conçue pour bloquer le raccordement de la ligne d'alimentation en encre (28) au réservoir d'encre (20), lorsqu'une pression à l'intérieur du réservoir (20) atteint une valeur prédéterminée. - Dispositif à jet d'encre selon la revendication 1, dans lequel la ligne d'alimentation en encre (28) comprend en outre un filtre à encre (36), la soupape (42) étant placée entre le filtre à encre (36) et le réservoir d'encre (20).
- Dispositif à jet d'encre selon la revendication 2, dans lequel l'unique trajectoire d'encre dans le réservoir d'encre (20) passe à travers le filtre à encre (36) et, après le filtre à encre (36), à travers la soupape (42).
- Dispositif à jet d'encre selon la revendication 2 ou la revendication 3, dans lequel le filtre à encre (36) est placé au-dessus du réservoir d'encre (20).
- Dispositif à jet d'encre selon l'une quelconque des revendications 2 à 4, dans lequel la ligne d'alimentation en encre (28) comprend en outre une sous-chambre (38) placée entre le filtre à encre (36) et la soupape (42).
- Dispositif à jet d'encre selon l'une quelconque des revendication 2 à 5, dans lequel la ligne d'alimentation en encre (28) comprend en outre une unité de fusion d'encre (30) destinée à délivrer l'encre fondue (22) à travers le filtre à encre (36) au réservoir d'encre (20).
- Dispositif à jet d'encre selon l'une quelconque des revendications précédentes, comprenant en outre un dispositif d'aspiration (56) conçu pour appliquer une pression négative sur ledit espace intérieur (18) du réservoir d'encre (20).
- Dispositif à jet d'encre selon l'une quelconque des revendications précédentes, dans lequel la soupape (42) comprend un élément de soupape sphérique (46), une cage (50) et un siège de soupape (44) pour l'élément de soupape (46), lequel élément de soupape (46) est apte à se déplacer librement entre le siège de soupape (44) et la cage (50), la masse de l'élément de soupape (46) étant supérieure à la masse de l'encre liquide (22) déplacée par l'élément de soupape (46).
- Dispositif à jet d'encre selon la revendication 8, dans lequel la cage (50) forme un diffuseur pour l'encre (22) qui s'écoule à travers la soupape (42) dans le réservoir d'encre (20).
- Dispositif à jet d'encre selon l'une quelconque des revendications 8 et 9, dans lequel la ligne d'alimentation en encre (28) comprend en outre un tube vertical (40), le siège de la soupape (44) étant placé au niveau d'une face interne dudit tube (40), lequel tube (40) entoure au moins une moitié supérieure de l'élément de soupape (46), lorsque l'élément de soupape (46) est appuyé contre le siège de la soupape (44).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20060123161 EP1803570B1 (fr) | 2005-11-14 | 2006-10-30 | Dispositif à jet d'encre ayant un dispositif de purge |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05110682 | 2005-11-14 | ||
EP20060123161 EP1803570B1 (fr) | 2005-11-14 | 2006-10-30 | Dispositif à jet d'encre ayant un dispositif de purge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1803570A1 EP1803570A1 (fr) | 2007-07-04 |
EP1803570B1 true EP1803570B1 (fr) | 2010-06-02 |
Family
ID=38115976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060123161 Active EP1803570B1 (fr) | 2005-11-14 | 2006-10-30 | Dispositif à jet d'encre ayant un dispositif de purge |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1803570B1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4788556A (en) * | 1987-04-28 | 1988-11-29 | Spectra, Inc. | Deaeration of ink in an ink jet system |
US4814786A (en) * | 1987-04-28 | 1989-03-21 | Spectra, Inc. | Hot melt ink supply system |
US4937598A (en) * | 1989-03-06 | 1990-06-26 | Spectra, Inc. | Ink supply system for an ink jet head |
US5489925A (en) * | 1993-05-04 | 1996-02-06 | Markem Corporation | Ink jet printing system |
-
2006
- 2006-10-30 EP EP20060123161 patent/EP1803570B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
EP1803570A1 (fr) | 2007-07-04 |
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