EP3463903A1 - Tête de nettoyage et dispositif et procédé de nettoyage de têtes d'impression - Google Patents

Tête de nettoyage et dispositif et procédé de nettoyage de têtes d'impression

Info

Publication number
EP3463903A1
EP3463903A1 EP17726286.2A EP17726286A EP3463903A1 EP 3463903 A1 EP3463903 A1 EP 3463903A1 EP 17726286 A EP17726286 A EP 17726286A EP 3463903 A1 EP3463903 A1 EP 3463903A1
Authority
EP
European Patent Office
Prior art keywords
cleaning
opening
discharge opening
cleaning head
discharge
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.)
Withdrawn
Application number
EP17726286.2A
Other languages
German (de)
English (en)
Inventor
Engin GENCAN
Markus Reiniger
Werner Van De Wynckel
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.)
KHS GmbH
Original Assignee
KHS GmbH
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 KHS GmbH filed Critical KHS GmbH
Publication of EP3463903A1 publication Critical patent/EP3463903A1/fr
Withdrawn legal-status Critical Current

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
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • 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
    • 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
    • B41J2002/1657—Cleaning of only nozzles or print head parts being selected

Definitions

  • the invention relates to a cleaning head and an apparatus and method for cleaning printheads.
  • Devices for printing containers are known in different designs.
  • printing systems for printing on containers using digital ink jet or ink jet printing heads are known.
  • printing systems or printing machines eg DE 10 2007 050 490 A1
  • the printheads have a plurality of nozzles arranged in one or more rows, by means of which the printing ink is applied to the container.
  • a problem with known printing devices is that form deposits on the nozzles, which are caused by dried ink residues. These deposits lead to an impairment of the discharge of printing ink through the nozzles and thus have a negative impact on the quality of the printed image.
  • a cleaning head by means of which an effective cleaning of the nozzles of the print head to obtain a high quality print image is made possible.
  • the object is achieved by a cleaning head according to the features of independent claim 1.
  • a cleaning device is the subject of the independent patent claim 14.
  • a method for cleaning a after the inkjet or ink-jet principle working printhead is the subject of the independent claim 18.
  • the invention relates to a cleaning head for cleaning printheads operating on the ink-jet or ink-jet principle.
  • the cleaning head comprises at least one feed opening releasing a cleaning liquid and at least one removal opening which removes the cleaning liquid and which is provided at a distance from the feed opening.
  • the cleaning fluid may preferably be provided under pressure in a continuous fluid flow and suctioned off at the discharge opening by negative pressure.
  • the feed opening and the discharge opening are arranged on an end face of the cleaning head, which faces the print head during cleaning. Particularly preferably, the end face is positioned at a small distance, for example a distance in the range between 0.1 mm to 2 mm in front of the nozzles of the print head.
  • the cleaning head is designed to emit at the feed opening a cleaning liquid jet directed in the direction of the discharge opening, so that the cleaning liquid can be removed by suction at the discharge opening.
  • the cleaning fluid exiting the supply port has a flow direction component that extends from the supply port toward the discharge port.
  • it is achieved by the directional release of the cleaning fluid that forms a preferably arcuate cleaning fluid stream in the area in front of the end face of the cleaning head, which is sucked directly back through the discharge opening after a free-flowing distance in front of the end face of the cleaning head.
  • the free-flowing path can for example have a length of 0.5 cm to 2 cm and in particular be in the range of 1 cm. Other dimensions of the free-flowing route are possible.
  • the cleaning head has the decisive advantage that only a spatially narrowly delimited area of the print head is acted upon by the directed release of the cleaning fluid in the discharge opening with the cleaning fluid, which is then immediately sucked back on the cleaning head, so that drainage or dripping of cleaning fluid along the printhead can be avoided.
  • the feed opening is provided above the discharge opening (ie, in an arrangement of the cleaning head in the cleaning position, vertically above the discharge opening).
  • the feed opening may be in the range between 0.2 cm and 2 cm, preferably in the range between 0.7 cm and 1.5 cm above the discharge opening, in particular 1 cm or approximately 1 cm.
  • the feed opening and the discharge opening are formed by slot-like openings, i.
  • the opening width of the openings i.e., the opening width in the horizontal direction when the cleaning head is in the cleaning position in front of the print head
  • the opening height is larger than the opening height. It is thereby achieved that the cleaning fluid is provided in a wide cleaning fluid jet with a low fluid jet height at the cleaning head.
  • the feed opening and the discharge opening are aligned parallel to each other, i. the longitudinal axes of the openings are parallel or substantially parallel to each other. This ensures that the fluid flow provided at the feed opening can be sucked off in an optimal manner at the spaced discharge opening.
  • the opening width of the discharge opening is larger than the opening width of the supply opening.
  • the discharge opening and the supply opening are arranged centrally centered with respect to a vertical vertical axis, so that the discharge opening preferably projects laterally on both sides relative to the feed opening, in particular has the same lateral projection on both sides.
  • the opening height (ie, the opening width in the vertical direction in an arrangement of the cleaning head in the cleaning position before Print head) of the discharge opening larger than the opening height of the supply opening.
  • the feed opening is provided at a free end of a feed channel, which extends obliquely or curved in the direction of the discharge opening, at least in the end section lying directly in front of the feed opening.
  • the feed channel running in the interior of the cleaning head is bent at least in sections in the direction of the discharge opening or extends obliquely in the direction of the discharge opening.
  • a deflecting device can be provided directly at the feed opening, by means of which the cleaning fluid jet is deflected in the direction of the discharge opening.
  • a theoretical outlet direction vector of the free-flowing fluid jet from the feed channel or its end portion and a theoretical inlet direction vector of the discharge channel or its end portion in the nozzle head include in a common plane an angle ⁇ , which is smaller than 180 ° and greater than 0th ° is.
  • This included angle ⁇ between outlet direction and inlet direction vector is usually in the size of 60 ° to 120 °.
  • the theoretical inlet direction vector results in an analogous manner as the theoretical outlet vector of the fluid jet.
  • the entrance vector is the fluid jet direction which would be formed by a pressurized, undisturbed fluid jet, but in a direction rotated 180 ° in the same plane.
  • the feed opening is provided at a free end of a feed channel, which widened in the direction of the feed opening in the horizontal direction and tapers in a direction perpendicular to the horizontal direction.
  • the feed channel can have a round cross-section which tapers in the direction of flow of the cleaning fluid, ie, in the direction of the feed opening, and widens laterally. This can already be done in the Feeding a desired shaping of the cleaning fluid jet while maintaining a high flow rate and low Strömungsverwirbelitch be achieved.
  • the discharge opening is provided at a free end of a discharge channel, which extends obliquely or curved in the direction of the feed opening, at least in the end section lying directly in front of the discharge opening.
  • the discharge channel running in the interior of the cleaning head is bent at least in sections in the direction of the feed opening or extends obliquely in the direction of this feed opening.
  • the discharge opening is provided at a free end of a discharge channel, which widened in the direction of the discharge opening in the horizontal direction and tapers in a direction perpendicular to the horizontal direction.
  • the discharge channel may have a round cross-section and may be opposite to the flow direction of the extracted cleaning fluid or the suction flow, i. taper in height in the direction of the discharge opening and widen laterally. Due to the continuous lateral widening or shaping of the discharge channel in the direction of the discharge opening, a suction power distributed as uniformly as possible over the cross section can be achieved at the discharge opening.
  • a second discharge opening is provided below the discharge opening as the first discharge opening.
  • the previously described, provided at the free end of the discharge channel discharge opening forms a first discharge opening and the second discharge opening is arranged below this first discharge opening.
  • a suction power can also be generated.
  • cleaning fluid not sucked off at the first discharge opening for example, cleaning fluid draining downwards at the cleaning head or cleaning fluid mist arising due to the cleaning, can be sucked off at the second discharge opening.
  • the feed opening and the first and the second discharge opening are provided on a common end face of the cleaning head, namely at the front end side facing the print head in a cleaning position.
  • the cleaning fluid jet can be formed between the feed opening and the discharge opening along a partial region of this end face.
  • the second discharge opening may, for example, be provided on an end face region which is set back relative to an end face region on which the feed opening and the discharge opening are provided.
  • the second discharge opening opens in a drip tray.
  • the cleaning fluid supplied through the second discharge opening of the drip tray can be collected and removed, in particular sucked off.
  • the second discharge opening and / or the drip tray are connected to the discharge channel, for example via a suction line extending as a branch line to the discharge channel.
  • suction of the cleaning fluid can be achieved by connecting a suction device or vacuum pump to the discharge channel both at the first discharge opening and at the second discharge opening or in the drip tray.
  • the invention relates to a cleaning device for cleaning printheads provided at printing stations.
  • Cleaning device has at least one cleaning head described above and a fixing device, wherein by means of the fixing device of the cleaning head can be positioned in front of a printhead to be cleaned.
  • the cleaning head can be held and aligned at the printing station.
  • the fixing device has an adjustment section which is provided for bearing against one or more reference surfaces provided on the printing station for aligning the cleaning head with respect to the print head.
  • the adjustment section has a contact section which is present at one or more provided on the printing station reference surfaces and cooperates with them in such a way that an alignment of the adjustment section relative to the printing station and thus an alignment of the cleaning head relative to the printhead to be cleaned.
  • the adjustment portion is arranged positionally variable on a holding portion of the fixing device.
  • the holding portion is intended to hold the cleaning device on a suitable support member, such as a column or a frame.
  • the adjustment section can be displaceable in one or more spatial directions and / or arranged pivotably about one or more axes of rotation on the holding section.
  • the adjustment portion may be biased spring-loaded without the action of external forces in a certain sliding or rotational position and be deflected from this sliding or rotational position against the spring force.
  • the adjustment section can be displaced or rotated by pressing against the reference surface provided at the printing station, and the cleaning head can be positioned in the desired manner in front of the print head.
  • the adjustment portion is provided above the cleaning head.
  • the adjustment portion is designed to cooperate with a receptacle for a container or for a container receiving and centering unit.
  • the reference surface by means of which the alignment of the adjustment is made with respect to the printing station, provided on a receptacle directly receiving the container, provided at the printing station container receptacle or the reference surface is provided on a receptacle for receiving and later release of a holding and Centering unit for such containers is used.
  • the reference surface thus has a local reference to the printhead and can thus be used to align the cleaning head relative to the printhead.
  • the invention relates to a method for cleaning a printhead which operates according to the ink-jet or ink-jet principle with a cleaning head, by means of which a cleaning fluid is provided on the printhead Printhead nozzles can be applied, wherein at a supply opening of the cleaning head, a cleaning fluid is discharged as a fluid jet, in the direction of a cleaning head provided discharge opening, wherein the cleaning fluid is discharged at the discharge opening by suction and wherein the printhead nozzles in between the supply opening and the discharge opening Cleaning fluid stream are introduced for cleaning.
  • the cleaning fluid along one of a
  • the cleaning fluid is not sprayed from the cleaning head to the nozzles of the print head, but it is on the front side of the cleaning head itself, a fluid flow between the supply port and the discharge opening
  • the feed opening is provided above the discharge opening on a front side facing the print head, so that the
  • Cleaning fluid during cleaning of the printhead nozzles is conveyed in a direction transverse to the ink discharge direction of the printhead nozzles. As a result, an improved cleaning effect can be achieved.
  • cleaning fluid is understood in particular to mean a water-based or solvent-based cleaning fluid which is designed to dissolve dried ink residues.
  • containers in the context of the invention, all containers are understood, especially bottles, cans, etc.
  • FIG. 1 shows by way of example a first embodiment of a cleaning head in a perspective view
  • FIG. 2 shows, by way of example, the cleaning head according to FIG. 1 in a sectional view through a mid-plane of the cleaning head;
  • FIG. 3 shows, by way of example, a second embodiment of a cleaning head in a sectional view through a central plane of the cleaning head;
  • FIG. by way of example a cleaning device positioned in front of a printing station in a side view, and by way of example a printing device for container printing with a cleaning device; and by way of example a cleaning device with a spring-mounted
  • the reference numeral 1 designates a cleaning head.
  • the cleaning head 1 is designed for cleaning of the ink jet principle or the inkjet principle working electronic printheads.
  • Such printheads as used for example in container printing devices, have a plurality of vertically stacked Nozzles, by means of which in each case printing ink can be delivered in drop form.
  • a cleaning fluid is applied to a region of the printhead on which the nozzles are provided by means of the cleaning head 1, so that the residues are dissolved and removed by this cleaning fluid.
  • the cleaning head 1 has an end face 1 .1, which faces the print head during the cleaning process.
  • this end face 1 .1 is arranged at a small distance from the nozzles of the print head, for example at a distance of 0.1 mm to 2 mm, in particular 0.3 mm to 1 mm, particularly preferably 0.5 mm.
  • the end face 1 .1 can have a planar section 1 .1 .1 that runs parallel or substantially parallel to the plane in which the free ends of the nozzles are arranged.
  • This planar-shaped section 1 .1 .1 preferably has the abovementioned distance values to the free ends of the nozzles of the print head.
  • a feed opening 2 is provided for the cleaning fluid. About this feed opening 2, the required cleaning of the print head cleaning fluid can be applied.
  • a first discharge opening 3 is provided, by means of which the cleaning fluid discharged from the feed opening 2 can be removed, in particular sucked off.
  • the first discharge opening 3 is provided in particular below the feed opening 2 (based on the installed state of the cleaning head 1).
  • the cleaning head 1 is in particular designed to generate a fluid stream of cleaning fluid between the feed opening 2 and the first discharge opening 3, which extends along the section of the end face 1 .1 of the cleaning head 1 which lies between the feed opening 2 and the first discharge opening 3. extends.
  • the cleaning head 1 is designed to generate a cleaning fluid flow extending along the end face 1 .1 between the feed opening 2 and the first discharge opening 3, the flow direction of the cleaning fluid stream preferably vertically or substantially vertically and further preferably directed from top to bottom.
  • an arcuate or substantially arcuate cleaning fluid flow is generated between the feed opening 2 and the first discharge opening 3, specifically at a short distance in front of the end face 1 .1, in particular of the planar end face section 1 .1 .1 of the cleaning head 1.
  • the cleaning fluid stream may preferably be a continuous fluid stream, ie during the cleaning of the printhead, cleaning fluid is continuously discharged from the supply opening 2 and drawn off through the first discharge opening 3.
  • the cleaning fluid thus flows in the free jet in front of the cleaning head, this free jet being a bundled fluid flow.
  • the cleaning head 1 is moved along the nozzle arrangement provided on the print head and the nozzles of the print head are rinsed off with the cleaning fluid.
  • the printhead can be moved relative to the fixed cleaning head 1. Further alternatively, it is possible that both the print head and the cleaning head 1 are moved relative to each other.
  • the feed opening 2 and the first discharge opening 3 may be formed slot-like, ie, have a larger opening width in a first opening direction than in a second opening direction orthogonal to the first opening direction.
  • the feed opening 2 and the first discharge opening 3 can be provided horizontally or substantially horizontally oriented on the cleaning head 1 (relative to the position in which the cleaning is performed).
  • the longitudinal axis of the feed opening 2 and the first discharge opening 3 can be parallel to each other.
  • the feed opening 2 and / or first discharge opening 3 may be formed by a plurality of juxtaposed individual openings, in particular such that a single row of openings forms a horizontal opening row forming the feed opening 2 and the discharge opening 3, respectively.
  • the longitudinal axes of the feed opening 2 and the first discharge opening 3 may be provided vertically or substantially vertically aligned on the cleaning head, and these may be arranged spaced apart in the horizontal direction, so that from the feed opening 2 out to the first discharge opening 3 results in a fluid flow resulting in a horizontal flow direction.
  • the angle ⁇ between the theoretical outlet direction vector 4.2 of an exiting cleaning fluid jet from the feed channel 4 or its end section 4.1 and the theoretical inlet direction vector 5.2 of the discharge channel 5 or its end section 5.1 in the common cutting plane is approximately 90 °.
  • the feed opening 2 may have an opening width b1 (measured in the horizontal direction) which is smaller than the opening width b2 of the discharge opening 3.
  • the supply opening 2 is arranged centered in the horizontal direction to the discharge opening 3.
  • the opening width b2 may be greater by a factor in the range between 1, 1 and 1, 5, in particular by a factor of 1, 2, 1, 3 or 1, 4 as the opening width b1. Particularly preferred is a factor of 1, 2.
  • the widths b1, b2 can be selected adapted to the respective printhead to be cleaned.
  • the width b2 can be in the range between 1 cm and 3 cm, in particular about 2 cm.
  • the feed opening 2 can have an opening height h1 (measured in the vertical direction) that is smaller than the opening height h2 of the discharge opening 3.
  • the opening height h1 can be chosen as small as possible in order to achieve the highest possible flow rate of the cleaning fluid.
  • the opening height h1 can in particular be in the range between 0.2 mm and 1.5 mm, more preferably 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.
  • the opening height h2 of the discharge opening 3 can be chosen as small as possible in order to achieve the best possible suction of the cleaning fluid.
  • the opening height h1 may be in the range between 2mm and 5mm and may preferably be 3mm or 4mm.
  • the distance d of the feed opening 2 to the discharge opening 3 can for example, in the range between 0.2 cm and 2 cm, preferably in the range between 0.7 cm and 1.5 cm, in particular 1 cm or about 1 cm.
  • FIG. 2 shows a vertical sectional view of the cleaning head 1 shown in FIG.
  • a feed channel 4 and a discharge channel 5 is formed.
  • the feed channel 4 to which the cleaning fluid can be supplied via a fluid line via a first connection region 1 .2, opens with its free end in the feed opening 2. This can be done, for example, via a fluid hose, not shown, which is shown schematically in FIG. 4 as a dot-dash line has been.
  • the feed channel 4 has an end section 4.1 which opens into the feed opening 2 and which is inclined or bent in the direction of the discharge opening 3 or the discharge channel 5.
  • the end section 4.1 of the feed channel 4 extends in the direction of the discharge opening 3, so that the distance between the feed channel 4 and the discharge channel 5 in the flow direction of the cleaning fluid is reduced by the end section 4.1. Due to the inclination or curvature / bending of the feed channel 4 in the region of the end section 4.1, it is achieved that the cleaning fluid emerges directed at the feed opening 2 in the direction of the underlying discharge opening 3.
  • the cleaning fluid from the supply port 2 with respect to the end face 1 .1 of the cleaning head 1 is not perpendicular to the front, but the cleaning fluid has in the region of the supply port 2, a flow direction component, which is directed in the direction of the discharge opening 3.
  • the cleaning fluid is deflected by the end portion 4.1 of the feed channel 4 in the direction of the discharge opening 3 out. In the preferred vertical mounting position so down.
  • the discharge channel 5 is coupled to a second connection region 1 .3, to which a line for discharging the cleaning fluid, in particular a suction line can be connected.
  • the discharge channel 5 opens at the end opposite the second connection region 1 .3 end in the discharge opening 3. This can, as indicated by dash-dotted lines in Figure 4, a suitable fluid hose are connected and connected to the associated units.
  • the discharge channel 5 has a front region (immediately adjacent to the discharge opening 3) End portion 5.1 which is inclined or curved / bent in the direction of the feed opening 2.
  • the end section 5.1 of the discharge channel 5 extends in the direction of the feed opening 2, so that the distance between the feed channel 4 and the discharge channel 5 is reduced in the direction of the end face 1 .1 through the end section 5.1. Due to the inclination or curvature / bending of the discharge channel 5 in the region of the end section 5.1, it is achieved that a suction flow directed in the direction of the feed opening 2 is produced at the discharge opening 3. In other words, the suction at the discharge opening 3 causes no in relation to the end face 1 .1 of the cleaning head 1 perpendicular suction flow but the suction flow is directed towards the emerging at the feed port 2 fluid flow.
  • FIG. 3 shows a vertical sectional view of a further embodiment of a cleaning head 1.
  • the upper section of the cleaning head 1, which comprises the feed channel 4 and the discharge channel 5 as well as the feed opening 2 and the first discharge opening 3, is formed analogously to the cleaning head 1 described above with reference to FIGS. 1 and 2. Therefore, only the differences of this embodiment of the cleaning head 1 with respect to the cleaning head 1 described above will be described below. Incidentally, with regard to the features of this embodiment, reference is made to the previous statements.
  • the essential difference between the cleaning head 1 according to FIG. 3 and the cleaning head 1 according to FIGS. 1 and 2 is that a further, second discharge opening 6 is provided below the first discharge opening 3.
  • This second discharge opening 6 is preferably provided at a distance from the first discharge opening 3 and is provided, for example, on a front side section 1 .1 .2 recessed with respect to the front side section 1 .1 .1.
  • the end face 1 .1 of the cleaning head 1 is stepped, wherein the End side section 1 .1 .1, on which the feed opening 2 and the first discharge opening 3 is provided, with respect to the end face portion 1 .1 .2, where the second discharge opening 6 is provided, protrudes.
  • the second discharge opening 6 it is possible for cleaning fluid or cleaning fluid mist not sucked from the first discharge opening 3, but in particular drops of cleaning fluid, which run downwards on the cleaning head 1, to be carried away.
  • a drip tray 7 is provided, which is fluidically connected to the second discharge opening 6. This drip tray 7 serves to catch the cleaning fluid.
  • a suction line 8 is preferably provided, by means of which the cleaning fluid which has reached the drip tray 7 can be carried away, in particular sucked off.
  • the suction line 8 is fluidly connected to the discharge channel 5, so that when connecting the discharge channel 5 to a suction device, in particular a vacuum source, also on the suction line 8, a negative pressure is created, via which the trapped in the drip tray 7 cleaning fluid is sucked.
  • a Venturi nozzle is provided in the coupling region of the suction line 8 and the discharge channel 5 in order to improve the suction power at the suction line 8.
  • FIG. 4 shows an arrangement of a printhead 1 1 held at a printing station 10 and a cleaning apparatus 20 for this printhead 10.
  • the cleaning apparatus 20 comprises a fixing device 21 by means of which a cleaning head 1 is held and aligned with respect to the printhead 11.
  • the fixing device 21 comprises an adjustment section 21 .1 and a holding section 21 .2.
  • the cleaning device 20 is attached to a supporting component of a printing device, for example a column or a frame of this printing device.
  • the holding portion 21 .2 have a fixing portion 21 .2.1.
  • a drive 23 may be provided by means of which the cleaning head 1 is moved in the direction of the print head 1 1.
  • the drive 23 acts by means of a gear on a rack to the cleaning head 1 in the direction of Printhead 1 1 to be able to proceed. It is understood that other Ant ebsscale example, a linear drive or rotary or rotary actuators are possible to move the cleaning head 1 in the desired cleaning position on the print head 1 1.
  • the adjustment section 21 .1 is movably mounted on the holding section 21 .2.
  • the adjustment section 21 .1 can be arranged movably on the holding section 21 .2 in three mutually orthogonal spatial directions, namely in a translatory manner and / or in a manner of pivoting about one or more pivot axes.
  • the adjustment section 21 .1 is displaceable or pivotable relative to the retaining section 21 .2 in a spring-loaded manner. From the adjustment portion 21 .1 is down from a holding arm 21 .1 .1 from where the cleaning head 1 is arranged. In the upper region of the adjustment section 21 .1, a contact section 21 .1 .2 is provided which has a reference surface 22. This reference surface 22 cooperates with a provided on the printing station 10 reference surface 12.1 to at least partially adjust the cleaning head 1 relative to the print head.
  • the adjustment section 21 .1 is moved toward the printing station 10 in such a way that the reference surface 22 of the contact section 21 .1 .2 comes into contact with the reference surface 12.1.
  • the reference surfaces 22 and 12.1 are designed such that, due to the movable mounting of the adjustment section 21 .1 on the cleaning device 20 and the forces exerted by the reference surface 12. 1 on the adjustment section 21 .1, the cleaning head 1 is aligned in a desired position. In this way, in particular, a coarse positioning of the cleaning head 1 can be achieved, after which coarse positioning a fine adjustment by a relative movement of the cleaning head 1 relative to the print head 1 1 or the print head 1 1 can be carried out relative to the cleaning head 1.
  • the reference surface 12.1 arranged at the printing station 10 may be a reference surface provided specifically for the positioning of the cleaning head 1.
  • the reference surface 12.1 is formed by a receptacle 12, to which either the container to be printed or a holding and centering unit for a container to be printed can be fastened either directly. That is, the reference surface 12.1 is formed, for example, by a reference surface provided on a container receptacle, or the reference surface 12.1 is provided on a receptacle 12 to which a holding and centering unit can be detachably fastened.
  • the reference surface 12.1 on the receptacle 12 can also be used so that the holding and centering unit can be fixed to the printing station 10 at a desired position.
  • one or more frusto-conical or a convex curvature having reference surfaces 12.1 may be provided on the receptacle 12, which cooperate with an inversely shaped reference surface 22 of the Justageabitess 21 .1 to achieve a desired positioning of the cleaning head 1 relative to the print head 1 1.
  • a magnet for example an electromagnet or permanent magnet
  • a magnet can be provided in the region of the printing station 10 and / or on the adjustment section 21 .1, by means of which the adjustment section 21 .1 is fixed to the printing station 10.
  • alignment of the cleaning head 1 can be achieved by the interaction of the reference surfaces 22 and 12.1.
  • FIG. 4 also shows, by way of example, a printing device 30 of a rotating design in which printing stations 10 are provided on the circumference of a transport element 31 that can be driven in rotation about a vertical machine axis MA.
  • the printing stations 10 can be formed for example by exchangeable printing segments, which have a print head 1 1 and a receptacle 12 for a holding and centering unit.
  • the adjustment portion 21 .1 of the cleaning device 20 to the print head 1 1, as indicated by the arrow to be moved.
  • the adjustment section 21 .1 can be moved in the radial direction (with respect to the machine axis MA of the transport element 31) toward the printing station 10.
  • the reference surface 22 of the adjustment section 21 .1 on the receptacle 12 comes to rest against one or more reference surfaces 12. 1 provided there.
  • a coarse positioning of the cleaning head 1 relative to the print head 1 1 is achieved. If necessary, then a fine adjustment can be made by means of which the cleaning head 1 is brought into a desired desired position in front of the nozzles of the print head 10.
  • the cleaning head 1 is positioned at a distance in the range between 0.1 mm to 2 mm, in particular 0.3 mm to 1 mm, particularly preferably 0.5 mm in front of the free ends of the nozzles of the print head 1 1. Subsequently, a relative movement between the cleaning head 1 and the print head 1 1 completed, in the vertical direction, so that the vertically arranged one above the other nozzles of the print head 1 1 are successively subjected to the cleaning process by applying the cleaning fluid.
  • the nozzles of the print head 1 1 are preferably cleaned in the vertical direction from top to bottom. Alternatively, it is also possible that the cleaning of the nozzles takes place in the reverse direction.
  • the cleaning head 1 Due to the above-described design of the cleaning head 1, it is possible that the discharged via the supply port 2 cleaning fluid after hitting the nozzles of the print head 1 1 is sucked directly through the discharge openings 3, 6, so that can be effectively prevented Cleaning fluid at the printhead 1 1 flows down towards the bottom and is drained or discharged at the lower end of the printhead there.
  • the cleaning head 1 generates a continuous flow of cleaning fluid during the cleaning process of a print head 1 1, which extends spatially limited along an end face of the cleaning head 1, the nozzles to be cleaned being introduced into this cleaning fluid flow.
  • the cleaning fluid is applied only in a spatially limited area on the print head, which is advantageous in terms of on the cleaning action and in relation to an undesired draining or draining of cleaning fluid along the print head 1 1.

Landscapes

  • Ink Jet (AREA)

Abstract

L'invention concerne une tête de nettoyage pour le nettoyage de têtes d'impression (11) fonctionnant selon le principe du jet d'encre. La tête comprend au moins une ouverture d'alimentation (2) distribuant un liquide de nettoyage et au moins une ouverture d'évacuation (3) évacuant le liquide de nettoyage, laquelle est ménagée à distance de l'ouverture d'alimentation (2). L'ouverture d'alimentation (2) et l'ouverture d'évacuation (3) sont ménagées sur une face frontale (1.1) de la tête de nettoyage (1), laquelle face est tournée vers la tête d'impression (11) lors du nettoyage, et la tête de nettoyage est conçue pour distribuer sur l'ouverture d'alimentation (2) un jet de liquide de nettoyage orienté en direction de l'ouverture d'évacuation (3), de sorte que le liquide de nettoyage peut être évacué sur l'ouverture d'évacuation (3) par aspiration.
EP17726286.2A 2016-06-03 2017-05-24 Tête de nettoyage et dispositif et procédé de nettoyage de têtes d'impression Withdrawn EP3463903A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016110322.5A DE102016110322A1 (de) 2016-06-03 2016-06-03 Reinigungskopf sowie Vorrichtung und Verfahren zur Reinigung von Druckköpfen
PCT/EP2017/062691 WO2017207410A1 (fr) 2016-06-03 2017-05-24 Tête de nettoyage et dispositif et procédé de nettoyage de têtes d'impression

Publications (1)

Publication Number Publication Date
EP3463903A1 true EP3463903A1 (fr) 2019-04-10

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Application Number Title Priority Date Filing Date
EP17726286.2A Withdrawn EP3463903A1 (fr) 2016-06-03 2017-05-24 Tête de nettoyage et dispositif et procédé de nettoyage de têtes d'impression

Country Status (5)

Country Link
US (1) US10639900B2 (fr)
EP (1) EP3463903A1 (fr)
CN (1) CN109219520B (fr)
DE (1) DE102016110322A1 (fr)
WO (1) WO2017207410A1 (fr)

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NL2020734B1 (en) * 2018-04-09 2019-10-14 Spgprints B V A printhead cleaning device for maintenance of a printhead of an inkjet printer
FR3094899B1 (fr) * 2019-04-15 2022-10-07 Exel Ind Installation d’application de produit de revêtement et procédé de nettoyage d’une telle installation
KR102617400B1 (ko) * 2020-08-06 2023-12-27 세메스 주식회사 헤드 세정 유닛 및 이를 포함하는 기판 처리 장치
KR102573601B1 (ko) * 2020-08-06 2023-09-01 세메스 주식회사 헤드 세정 유닛 및 이를 포함하는 기판 처리 장치
JP2024045921A (ja) * 2022-09-22 2024-04-03 株式会社Ｓｃｒｅｅｎホールディングス 印刷装置

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JPH0542678A (ja) * 1991-08-12 1993-02-23 Fuji Xerox Co Ltd インクジエツトプリンタのメンテナンス装置
US6312090B1 (en) * 1998-12-28 2001-11-06 Eastman Kodak Company Ink jet printer with wiper blade cleaning mechanism and method of assembling the printer
DE102007050490A1 (de) 2007-10-19 2009-04-23 Khs Ag Vorrichtung und Verfahren zum Bedrucken von Behältern
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JP4904420B2 (ja) * 2009-09-28 2012-03-28 パナソニック株式会社 インクジェット用のワイプ装置およびこれを用いたワイプ方法
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JP6283911B2 (ja) * 2013-06-25 2018-02-28 パナソニックＩｐマネジメント株式会社 ワイプ装置、インクジェット装置、および、ワイプ方法
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Also Published As

Publication number Publication date
DE102016110322A1 (de) 2017-12-07
US10639900B2 (en) 2020-05-05
CN109219520A (zh) 2019-01-15
CN109219520B (zh) 2020-07-14
US20190160821A1 (en) 2019-05-30
WO2017207410A1 (fr) 2017-12-07

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