Printhead cleaning device for a 3D printer, 3D printer, use of the printhead cleaning device for a 3D printer, method for cleaning a printhead of a 3D printer, method for cleaning a wiping element of a printhead cleaning device of a 3D printer, and method for preserving a printhead of a 3D printer.

Abstract

Printhead cleaning device (10) for a 3D printer configured to build a component layer by layer using binder jetting, wherein the printhead cleaning device (10) comprises: a carrier (12) on which a wiping element (14) is arranged and which has a plurality of nozzles (16) which are designed to dispense liquid cleaning agent, wherein the carrier (12) is rotatably supported on a holding structure (18) of the printhead cleaning device (10) and the printhead cleaning device (10) has a rotary drive (28) for rotating the carrier (12), and / or wherein the nozzles (16) form a first nozzle row (30) in which a plurality of nozzles (16) are arranged one after the other along the wiper element (14) and adjacent to it on the carrier (12), and a second nozzle row (32) in which a plurality of nozzles (16) are arranged one after the other along the wiper element (14) and adjacent to it on the carrier (12), and the first nozzle row (30) and the second nozzle row (32) are arranged on different sides of the wiper element (14), and / or wherein the wiper element (14) has a Y-shape in cross-section, one leg of which is held by the carrier (12) and the two remaining legs each form a wiper lip (38, 40) which are different from each other.

Description

[0001] The present invention relates to a printhead cleaning device for a 3D printer configured to build a component layer by layer using binder jetting, a 3D printer with the printhead cleaning device, the use of the printhead cleaning device, various methods for cleaning one or more printheads of a 3D printer, and a method for preserving a printhead of a 3D printer.

[0002] Various additive manufacturing processes or 3D printing processes (and consequently various types of 3D printers, i.e., machines / systems for the layer-by-layer construction of a component) are known.

[0003] Some additive manufacturing processes have the following steps in common: (1) Particle material (or particulate building material) is first applied over the entire surface / continuously to a building area to form a layer of unsolidified particle material. (2) The applied layer of non-solidified particle material is selectively solidified in a predetermined sub-area (corresponding to the component to be manufactured), for example by selective printing of (e.g. liquid) treatment agent, for example binder, for example binder. (3) Steps (1) and (2) are repeated to produce a desired component. For this purpose, for example, a build platform on which the component is built up layer by layer can be lowered by one layer thickness before a new layer is applied (alternatively, for example, a recoater and a printing device can each be raised by one layer thickness). (4) Finally, the manufactured component, which is formed from the solidified sub-areas and is supported and surrounded by loose, non-solidified particle material, can be unpacked.

[0004] The assembly space in which the component(s) are manufactured can be defined, for example, by a so-called assembly box (also called a "job box"), such as a swap body. Such an assembly box can have an open-topped, vertically extending perimeter wall structure (for example, formed by four vertical side walls), which may be rectangular in plan view. A height-adjustable assembly platform can be accommodated within the assembly box. The space above the assembly platform and between the vertical perimeter wall structures can, for example, at least partially define the assembly space. An upper area of ​​the assembly space can, for example, be referred to as the build area. An assembly box is described, for example, in DE 10 2009 056 696 A1.

[0005] The layer-by-layer construction of one or more three-dimensional components in a / the construction space can be achieved, for example, by selectively solidifying several adjacent layers of building material in a respective sub-area thereof, for example by binder jetting, i.e. by (selectively) “bonding” the (particle-shaped) building material with a (for example, liquid) treatment agent, for example, binder.

[0006] In the above step (1), a recoater is typically used. Various recoaters are known for use in 3D printers, which can apply a particulate building material to the build area (also called build surface or build area) in the form of a uniform, full-surface / continuous layer.

[0007] One type of coating machine uses a roller (referred to as a "roller coater") in front of which a quantity of particulate building material is first deposited. The roller is then moved horizontally across the construction area to apply the particulate building material in a uniform layer. The roller can rotate in the opposite direction during this process.

[0008] Another type of coater (so-called "container coater," for example, "slot coater") uses a container that defines an internal cavity for receiving particulate building material and has a (for example, elongated) output area, for example, featuring a (for example, elongated) output slot, for dispensing the particulate building material. The container coater can, for example, be moved across a build area (for example, horizontally, for example, perpendicular to its longitudinal direction), whereby the particulate building material can be dispensed through the (elongated) output area onto the build area to apply a uniform, continuous layer of building material to the build area or platform. The coater can, for example, be elongated to span or cover the length or width of a rectangular build area.Coaters are described, for example, in DE 10 2009 056 689 A1 and EP 3 753 709 A1.

[0009] In step (2) above, for example, a printing device with a printhead can be used to apply a (for example, liquid) treatment agent to a section of the previously applied layer of building material (so-called "binder jetting"). The treatment agent contributes to the (immediate and / or subsequent) hardening of the building material layer in that section. For example, the treatment agent can be / contain a binder, such as a binder component of a multi-component binder.

[0010] The treatment agent to be printed may be viscous and / or may, under certain circumstances, adhere to an output area (e.g., treatment agent output area) of the printhead, for example, to the printhead nozzle openings and / or to the underside of the printhead. Similarly, suspended particles and / or dirt particles may adhere to the output area, for example, to the underside of the printhead.

[0011] Such deposits / adhesions of treatment agent and / or particulate material at the dispensing area can, for example, affect the discharge of treatment agent, such as the exit of treatment agent droplets from nozzle openings. This can lead to deflection and / or deformation of the binder droplets. Furthermore, the uppermost layer of particulate material can be at least partially destroyed by the deposits / adhesions. Thus, the deposits / adhesions can, for example, impair the quality of the manufactured components.

[0012] Therefore, it may be necessary to clean the output area of ​​the printhead, for example the underside of the printhead, for example the side of the printhead facing the build platform, for example the nozzles located on the underside of the printhead, (regularly).

[0013] From DE 10 2009 056 695 A1 a printhead cleaning device for a 3D printer is known, which is set up to build a component layer by layer using binder jetting, wherein the printhead cleaning device has a wiping element with two wiping lips for wiping the underside of the printhead.

[0014] From DE 20 2019 102 983 U1 a printhead cleaning device for a 3D printer is known, which is set up to build a component layer by layer using binder jetting, wherein the printhead cleaning device has an output opening for dispensing a liquid cleaning agent to the underside of the printhead and a suction gap for extracting a fluid from the underside of the printhead.

[0015] WO 2020 / 237122 A2 discloses a cleaning station for an additive manufacturing system, wherein the cleaning station comprises: a cleaning station container having a wet wipe cleaning section and a dry wipe cleaning section downstream of the wet wipe cleaning section, wherein: the wet wipe cleaning section has a wet wipe element coupled to an actuator, wherein the actuator is operable to raise and lower the wet wipe element vertically into the cleaning station container;and the dry wipe cleaning section comprises a dry wipe element coupled to an actuator, wherein the actuator is operable to raise and lower the dry wipe element vertically into the cleaning station reservoir, wherein the wet wipe cleaning section and the dry wipe cleaning section are arranged sequentially such that the wet wipe element is configured to apply cleaning fluid to a printhead, and the dry wipe element is configured to remove excess cleaning fluid from the printhead after cleaning with the wet wipe cleaning section.

[0016] US 2020 / 0055246 A1 discloses a maintenance and / or parking unit (parking station) for printheads and a system comprising a printhead and the maintenance and / or parking unit (parking station).

[0017] It can be considered an object of the present invention to provide an improved printhead cleaning device for a 3D printer configured to build a component layer by layer using binder jetting, and a 3D printer comprising the printhead cleaning device.

[0018] Alternatively or additionally, it can be considered an object of the present invention to provide a printhead cleaning device for a 3D printer and a 3D printer with which an output area of ​​a printhead can be cleaned efficiently (thoroughly and / or reliably).

[0019] Alternatively or additionally, it can be considered an object of the present invention to provide an (alternative) printhead cleaning device for a 3D printer and a 3D printer with which a component can be reliably manufactured in 3D printing by means of binder jetting.

[0020] Alternatively or additionally, it can be considered an object of the present invention to provide improved methods for cleaning a print head of a 3D printer.

[0021] Alternatively or additionally, it can be considered an object of the present invention to specify a use of the printhead cleaning device and methods for cleaning a printhead of a 3D printer, with which an output area of ​​the printhead can be cleaned efficiently (thoroughly and / or reliably) and / or with which a component can be reliably manufactured in 3D printing by means of binder jetting.

[0022] Alternatively or additionally, it can be considered an object of the present invention to provide a method for preserving a printhead of a 3D printer, with which an output area of ​​the printhead can be preserved in a simple and / or efficient manner (thoroughly and / or reliably) (for example, if the printhead is not to be used for a longer period of time and / or is to be stored) and subsequently put back into operation.

[0023] The present invention provides a printhead cleaning device for a 3D printer according to claim 1, a 3D printer according to claim 13, a use of the printhead cleaning device according to claim 15, a method for cleaning a printhead of a 3D printer according to claim 16, a method for cleaning one or more printheads of a 3D printer according to claim 20, and a method for preserving a printhead of a 3D printer according to claim 21. Further embodiments of the present invention are described in the dependent claims.

[0024] According to a first aspect of the invention, a printhead cleaning device for a 3D printer configured to build a component layer by layer using binder jetting (i.e., by controlled application of (for example, liquid) treatment agent, for example, binder, to a portion of a previously applied layer of particle material) comprises a (for example, elongated, for example, oblong) carrier on which a (for example, elongated, for example, oblong) wiping element is arranged and which has a plurality of nozzles (for example, 10 or more nozzles, for example, 15 or more nozzles, for example, 20 or more nozzles, for example, 25 or more nozzles, for example, 30 or more nozzles) configured to spray liquid cleaning agent (for example, upwards, for example, in the direction of a printhead to be cleaned,(if this is arranged above the printhead cleaning device) to dispense (for example, so that a liquid bubble filled with the liquid cleaning agent is formed, in which at least one section, for example a free end section, of the wiper element is contained). For example, a longitudinal axis of the (elongated or elongated) support and a longitudinal axis of the (elongated or elongated) wiper element can be (for example, substantially) parallel to each other.

[0025] The nozzles allow, for example, the easy and / or reliable delivery of a cleaning agent to the printhead (to be cleaned), specifically to the printhead's output area. This cleaning agent can moisten, dissolve, swell, and / or emulsify deposits or contaminants adhering to the printhead, such as treatment agents and / or particulate matter, thereby facilitating their easy and / or reliable removal. Similarly, the wiping element allows for the easy, reliable, and / or rapid removal of deposits or contaminants adhering to the printhead, particularly when these deposits or contaminants are moistened, dissolved, swollen, and / or emulsified.The wiper element allows, for example, the printhead to be dried easily, reliably, and / or quickly, so that printing can begin immediately after cleaning. The nozzles also allow, for example, the wiper element to be cleaned easily, reliably, and / or quickly, for example by rinsing and / or washing the wiper element with the cleaning agent dispensed from the nozzles.

[0026] Surprisingly, it was found that arranging the wiping element and nozzles on a single (common) carrier is particularly advantageous. This allows, for example, a compact and / or simple method for first applying the cleaning agent to the printhead (to be cleaned) and then wiping it with the wiping element. Alternatively or additionally, it allows, for example, a compact and / or simple method for simultaneously wiping the printhead (to be cleaned) while a liquid cleaning agent is being applied, or for simultaneously applying a liquid cleaning agent while wiping the printhead, which can, for example, improve the cleaning effect.Alternatively or additionally, it can be made possible, for example, to clean the wiping element itself in a compact and / or simple manner, for instance, after the wiping element has been used to wipe the printhead and / or while it is being used to wipe the printhead. This can improve the cleaning effect of the printhead cleaning device and allow for efficient (thorough and / or reliable) cleaning of the printhead. Furthermore, components can be reliably manufactured using binder jetting in 3D printing.

[0027] The nozzles can be arranged, for example, along the wiper element and adjacent to it (e.g., on both sides of the wiper element) on the (common) carrier. The nozzles can, for example, be shaped or formed by the carrier. This allows, for example, a compact design for the printhead cleaning device and / or the carrier. The nozzles can, for example, be identical or different from one another. The nozzle openings can, for example, be identical or different from one another. The nozzle openings can, for example, be (essentially) round or elongated, or (essentially) ellipsoidal or oval. The nozzle openings can, for example, be (essentially) the same size or different sizes.

[0028] The liquid cleaning agent can be, for example, an aqueous cleaning agent, such as an aqueous cleaning fluid. The liquid cleaning agent can be, for example, an aqueous solution of a cleaning agent component, such as an aqueous solution of a surfactant, such as an aqueous surfactant solution. The liquid cleaning agent can, for example, contain water and a cleaning agent, such as water and a cleaning agent component, such as water and a surfactant. The liquid cleaning agent can, for example, be a water-based cleaning agent, such as water and a cleaning agent, such as a cleaning agent component, such as a surfactant. The liquid cleaning agent can, for example, contain at least one alcohol. The liquid cleaning agent can, for example, contain at least one organic solvent.The liquid cleaning agent can, for example, be based on one or more organic solvents. The liquid cleaning agent can, for example, be an organic solvent-based cleaning agent, containing an organic solvent and other additives, for example, to improve its cleaning effect. The liquid cleaning agent can, for example, be designed to dissolve and / or emulsify a treatment agent (for example, a binder). The treatment agent (or its components) can, for example, be soluble in the liquid cleaning agent, meaning that the treatment agent (or its components) and the liquid cleaning agent can, for example, form a solution. The treatment agent (or its components) can, for example, be emulsifiable in the liquid cleaning agent, meaning that the treatment agent (or its components) can be dissolved in the liquid cleaning agent.Components thereof) and the liquid cleaning agent can, for example, form an emulsion. For example, instead of the liquid cleaning agent, a preservative can be dispensed, such as a preservative designed to preserve an output area of ​​the printhead, or a preservative designed to seal or close printhead nozzles. For example, the liquid cleaning agent can be designed to at least partially dissolve and / or emulsify the preservative within it.

[0029] The wiping element and the nozzles can be configured (for example, arranged on the (common) carrier) in such a way that the wiping element is at least partially wettable by the liquid cleaning agent dispensed from the nozzles, for example, by being rinsed and / or washed off. This allows, for example, the wiping element to be reliably cleaned in a compact and / or simple manner.

[0030] The nozzles can be configured (for example, arranged on the carrier) such that the output area of ​​a printhead being cleaned is wetted by the liquid cleaning agent dispensed from the nozzles when the printhead is positioned above the printhead cleaning device. The nozzles can be configured, for example, to dispense the liquid cleaning agent upwards. The nozzles can be configured, for example, to dispense the liquid cleaning agent in the direction in which the wiping element projects from the carrier. The nozzles can be configured, for example, to dispense the liquid cleaning agent in a direction that is (essentially) parallel to the direction in which the wiping element projects from the carrier. This allows, for example, the aforementioned advantages and effects to be achieved.

[0031] According to a first alternative, the support is mounted on a retaining structure of the printhead cleaning device. This retaining structure can, for example, form a (trough-shaped) recess. The (trough-shaped) recess can, for example, have at least two side walls (for example, four side walls) and a bottom. The support can, for example, be mounted on a retaining structure of the printhead cleaning device that forms a (trough-shaped) recess. The support can, for example, be mounted on two opposing side walls of the (trough-shaped) recess formed by the retaining structure. The support can, for example, be mounted on a bottom formed by the retaining structure of the (trough-shaped) recess. This allows, for example, a compact design for the printhead cleaning device. Additionally, it can, for example, enable simple and / or reliable cleaning of the printhead.

[0032] For example, the holding structure or the (trough-shaped) recess can be designed to receive and / or collect liquid cleaning agent dispensed from the nozzles, for example, that which was dispensed from the nozzles towards the (to be cleaned) printhead. For example, the holding structure or the (trough-shaped) recess can be designed to receive and / or collect material (for example, fluid, for example, containing the liquid cleaning agent and / or particulate material and / or treatment agent dispensed from the printhead, for example, binder) that has been detached (for example, detached by the liquid cleaning agent) and / or wiped off (for example, by the wiping element). For example, the holding structure or thethe (tub-shaped) depression has an outlet (for example, located in a side wall or the bottom of the (tub-shaped) depression), for example, to drain the material received or collected in the holding structure or in the (tub-shaped) depression.

[0033] According to the first alternative, the support is rotatable and optionally height-adjustable, mounted on the support structure. The support can, for example, be rotatably mounted on two opposing side walls of the (trough-shaped) recess formed by the support structure. This allows, for example, a compact and / or simple way to supply the printhead with liquid cleaning agent without the printhead coming into contact with the wiping element. Additionally, the rotatability allows, for example, a (specific) wiping lip of a Y-shaped wiping element (for example, the Y-shaped wiping element described below) to be brought into contact with the printhead in a simple and / or reliable manner (to wipe it), so that, for example, the cleaning and / or wiping action can be easily and / or reliably adjusted.

[0034] The printhead cleaning device can, for example, include a lifting drive for adjusting the height of the support structure and / or the carrier. The lifting drive can, for example, be supported on a side wall and / or the bottom of the (trough-shaped) recess. The lifting drive can, for example, be located outside the (trough-shaped) recess, for example, below or beside the (trough-shaped) recess. The lifting drive can, for example, be located inside the (trough-shaped) recess, for example, on / at the bottom of the (trough-shaped) recess.

[0035] According to the first alternative, the printhead cleaning device has a rotary drive for rotating the carrier. The rotary drive can, for example, be supported and / or arranged on a side wall of the (trough-shaped) recess. Alternatively, the rotary drive can be supported and / or arranged on one of the two side walls on which the carrier is supported or rotatably mounted. The rotary drive can, for example, be located outside or inside the recess.

[0036] The carrier can be positioned, for example, at least partially or completely, within the (trough-shaped) recess. This allows, for example, a compact design for the printhead cleaning device. Additionally, it can enable simple and / or reliable cleaning of the printhead.

[0037] According to a second alternative, the nozzles form a first row, in which a plurality of nozzles are arranged one behind the other along the wiper element and adjacent to it on the carrier. For example, a longitudinal axis of the wiper element and a longitudinal axis of the first row of nozzles can be (essentially) parallel to each other. This allows, for example, a compact design for the printhead cleaning device. Additionally, it enables, for example, simple and / or reliable cleaning of the printhead and / or the wiper element.

[0038] According to the second alternative, the nozzles further form a second nozzle row, in which a plurality of nozzles (for example, those different from the nozzles of the first nozzle row) are arranged one behind the other along the wiper element and adjacent to it on the carrier. According to the second alternative, the first nozzle row (for example, the nozzles that form the first nozzle row) and the second nozzle row (for example, the nozzles that form the second nozzle row) are arranged on opposite sides of the wiper element. For example, the longitudinal axis of the wiper element and a longitudinal axis of the second nozzle row can be (for example, essentially) parallel to each other. This allows, for example, the printhead cleaning device to be designed compactly.Additionally, for example, simple and / or reliable cleaning of the printhead and / or the wiper element can be made possible.

[0039] For the purposes of this invention, a nozzle array can be understood to mean, for example, an arrangement in which the nozzles (which form the nozzle array or of which the nozzle array is formed) are arranged along (for example, on, or along) a (virtual) straight line. Alternatively or additionally, for the purposes of this invention, a nozzle array can be understood to mean, for example, an arrangement in which the nozzles (which form the nozzle array or of which the nozzle array is formed) are arranged along (for example, on, or along) a (virtual) elongated strip, wherein the nozzles can, for example, be arranged in a zigzag pattern on the strip. For the purposes of this invention, "parallel" means that the longitudinal axes are arranged at an angle of less than or equal to 5°, for example, less than or equal to 4°, for example, less than or equal to 3°, for example, less than or equal to 2°, for example, less than or equal to 1°, to each other.

[0040] For example, the nozzles of the first row can be different from those of the second row. For example, the openings of the nozzles in the first row can be different from those of the nozzles in the second row. For example, the nozzles and / or their openings of the first row can be the same. For example, the nozzles and / or their openings of the second row can be the same. This allows, for example, the appropriate dispensing of different liquid cleaning agents (e.g., with different viscosities, for example, due to different compositions). Additionally, it can enable, for example, simple and / or reliable cleaning of the printhead.

[0041] The carrier can, for example, have a first line that is fluidly connected to the first row of nozzles (e.g., to the nozzles that form the first row), and a separate second line that is fluidly connected to the second row of nozzles (e.g., to the nozzles that form the second row). The first line can, for example, have a first section that is fluidly connected to a first section of the first row of nozzles (e.g., to the nozzles that form the first section of the first row), and a separate second section that is fluidly connected to a second section of the first row of nozzles (e.g., to the nozzles that form the second section of the first row).The second line can, for example, have a third line section that is fluidly connected to a first section of the second nozzle row (for example, to nozzles that form the first section of the second nozzle row), and a separate fourth line section that is fluidly connected to a second section of the second nozzle row (for example, to nozzles that form the second section of the second nozzle row). The first line and / or the second line and / or the first line section and / or the second line section and / or the third line section and / or the fourth line section can, for example, be formed or (co-)constructed by the support.This allows, for example, various liquids to be supplied to the (to be cleaned) printhead in a simple and / or reliable manner, for example liquids with different properties, for example various liquid cleaning agents, for example liquid cleaning agents with different properties (for example cleaning properties), for example a liquid for preserving the printhead or its nozzles, for example a liquid for reactivating clogged nozzles of the printhead.For example, in a first cleaning step, a liquid with hydrophilic properties (e.g., a hydrophilic liquid, for example, a hydrophilic (liquid) cleaning agent) can be applied to the printhead in a simple and / or reliable manner, enabling, for example, reliable wetting and / or cleaning of the printhead, and in a second cleaning step, a liquid with hydrophobic properties (e.g., a hydrophobic liquid, for example, a hydrophobic (liquid) cleaning agent) can be applied to the printhead, which can be easily and / or reliably wiped and / or vacuumed off the printhead, thus enabling, for example, easy and / or reliable drying of the printhead.

[0042] The wiping element can, for example, form one, two, or more wiping lips. According to a third alternative, the wiping element has a Y-shaped cross-section, with one leg held by the support and the two remaining legs each forming a wiping lip. For example, the two or more wiping lips can be different from each other. For example, the two or more wiping lips can have different geometric cross-sectional shapes, for example, to achieve different cleaning effects. For example, the free end of a first wiping lip can have a rounded cross-sectional shape. For example, the free end of a second wiping lip can have a tapered cross-sectional shape, such as a trapezoid, an isosceles trapezoid, a triangle, or an isosceles triangle.For example, the two or more wiping lips can be made of different materials, for instance, to achieve different wiping and / or cleaning effects. For example, a first wiping lip can be made of felt or a sponge, for instance, to assist in cleaning the output area of ​​the printhead being cleaned. For example, a second wiping lip can be made of rubber, for instance, to assist in drying and / or wiping the output area of ​​the printhead being cleaned. For example, the wiping element can be interchangeable on the carrier. This can, for instance, enable simple and / or reliable cleaning of the printhead.

[0043] For example, the support can have a flat surface, such as a strip-shaped flat surface, into which the nozzle openings of the nozzles open and from which the wiper element projects. For example, the support can have and / or form a groove, for example, in which one end of the wiper element, for example, the leg of the Y-shaped wiper element held by the support, is received and / or arranged. For example, the (strip-shaped) flat surface can have a first strip and a second strip, for example, between which the groove is arranged. For example, the groove can be arranged and / or formed in such a way as to divide the (strip-shaped) flat surface into a first strip and a second strip. For example, the nozzle openings of the first row of nozzles can open into the first strip and / or the nozzle openings of the second row of nozzles can open into the second strip.This allows the carrier to be provided or manufactured in a simple and / or reliable manner. Furthermore, this allows the wiping element to be cleaned and / or replaced in a simple and / or reliable manner. This enables, for example, simple and / or reliable cleaning of the printhead.

[0044] The printhead cleaning device can, for example, further include a suction device having one (e.g., elongated, oblong) suction slot or several (e.g., two or more, three or more, four or more, five or more) (e.g., elongated, oblong) suction slots and being configured to draw fluid, for example, from the printhead to be cleaned, through the (e.g., elongated, oblong) suction slot(s). The several (elongated or oblong) suction slots can, for example, be arranged one behind the other in the longitudinal direction. The suction device can, for example, be arranged such that a longitudinal axis of the suction slot orThe longitudinal axes of the suction slots and a longitudinal axis of the support and / or the wiping element and / or the first row of nozzles and / or the second row of nozzles are arranged parallel to each other. The longitudinal axes of the multiple suction slots can, for example, be (essentially) identical. This enables, for example, reliable cleaning and / or drying of the printhead.

[0045] The extraction device can, for example, include one or more vacuum pumps with which a fluid flow can be generated through the extraction gap(s). The extraction device can, for example, be arranged adjacent to the support structure or the (trough-shaped) recess, for example, on a side wall of the (trough-shaped) recess. The extraction device can, for example, have one or more recesses that are partially covered by a cover, such as a cover plate and / or a cover strip, or several covers, such as cover plates and / or cover strips, forming the extraction gap(s). For example, each of the several recesses can be covered by an associated cover, forming an extraction gap.The cover(s), for example, the cover plate and / or the cover strip, may be detachably attached to the extraction device, for example, by means of one or more screws. The extraction device may, for example, have one or more extraction openings, which are provided, for example, in the bottom of the trough(s). For example, each of the several troughs may have an associated extraction opening. The extraction gap, the trough, and / or the extraction opening(s) may, for example, be fluid-connected to each other. The vacuum pump may, for example, be fluid-connected to the extraction gap, the trough, and / or the extraction openings. The vacuum pump may, for example, be fluid-connected to the extraction openings via a vacuum line. For example, each extraction opening may be connected to a separate vacuum pump. The extraction device may, for example, be designed as described in DE 20 2019 102 983 U1.

[0046] The printhead cleaning device may, for example, further include a control device which may be configured, for example, to variably adjust the flow rate of the liquid cleaning agent exiting the nozzles, for example, by controlling a pump (for example, the pump described below) and / or a valve (for example, the valve described below). For example, the flow rate may be variably adjustable by the control device such that a liquid bubble filled with the cleaning agent is formed, in which at least one free end section of the wiper element is contained. For example, the flow rate may be variably adjustable by the control device such that the height of the liquid bubble filled with the cleaning agent is variably adjustable.This allows, for example, simple and / or reliable cleaning of the printhead and / or the wiper element.

[0047] For example, the printhead cleaning device may further include at least one cleaning agent reservoir, for example, for holding the liquid cleaning agent. For example, the printhead cleaning device may further include at least one pump, for example, configured to supply the liquid cleaning agent from the cleaning agent reservoir to the nozzles. For example, the printhead cleaning device may further include at least one cleaning agent line that fluidly connects the cleaning agent reservoir to the nozzles or to the first and / or second line. For example, the pump may be arranged in the cleaning agent line, for example, downstream of the cleaning agent reservoir and / or upstream of the nozzles or the first and / or second line.For example, the printhead cleaning device can further comprise at least one valve, for example, arranged in the cleaning agent line, for example, downstream of the pump and / or upstream of the nozzles or the first and / or second line. The cleaning agent line can, for example, connect the cleaning agent reservoir and / or the pump and / or the valve and / or the nozzles and / or the first and / or second line. For example, the pump and / or the valve can be controlled by the control device.

[0048] For example, the carrier can have a first (e.g., upper) part and a second (e.g., lower) part. For example, the wiping element can be arranged on the first part, and / or the first part can have the nozzles, and / or the first part can have the first line and / or the second line, and / or the first part can form the (strip-shaped) flat surface. For example, the second part can be supported on the mounting structure and / or rotatably mounted.

[0049] For example, the printhead cleaning device can have a level sensor. The level sensor can be located on the mounting structure or the (trough-shaped) recess. It can also be located in a side wall or the bottom of the (trough-shaped) recess. The level sensor can be configured to detect the level of the material (e.g., fluid) held or collected in the mounting structure or the (trough-shaped) recess.

[0050] According to a second aspect of the invention, a 3D printer can, for example, comprise the printhead cleaning device according to the first aspect of the invention and a printhead for selectively printing particle material using the binder jetting process. The 3D printer can, for example, further comprise a recoater and / or a build box.

[0051] The 3D printer may, for example, also have a control device that can be configured to move the printhead over the printhead cleaning device for cleaning. For example, the control device may be configured to, on the first movement of the printhead over the cleaning device, dispense liquid cleaning fluid from the nozzles in such a way that an output area of ​​the printhead is at least partially, for example completely, wetted with liquid cleaning fluid, and on the second movement of the printhead over the cleaning device, not to dispense any liquid cleaning fluid from the nozzles.For example, the control device can be configured to adjust the carrier to a second position (e.g., rotate it to a second position, adjust its height) during the second movement of the printhead over the printhead cleaning device, in which the wiping element makes contact with the printhead's output area. Alternatively, the control device can be configured to adjust the carrier to a first position (e.g., rotate it to a first position, adjust its height) during the first movement of the printhead over the printhead cleaning device, in which the wiping element does not make contact with the printhead's output area.To adjust the carrier to the first and / or second position, the control device can, for example, be configured to actuate a rotary drive and / or a linear drive (for example, the rotary drive and / or the linear drive described above). To dispense liquid cleaning agent from the nozzles, the control device can, for example, be configured to actuate a pump and / or a valve (for example, the pump and / or the valve described above).

[0052] For example, the control device of the 3D printer and the control device of the printhead cleaning device can be a single control device or be formed by a common control device. For example, the 3D printer and the printhead cleaning device can have a common control device.

[0053] According to a third aspect of the invention, the printhead cleaning device according to the first aspect of the invention can be used, for example, to clean a printhead, for example, a binder jetting printhead, of a 3D printer, for example, the 3D printer according to the second aspect of the invention.

[0054] According to a fourth aspect of the invention, a method for cleaning a printhead of a 3D printer (for example, the 3D printer according to the second aspect of the invention), which is configured to build a component layer by layer using binder jetting, comprises: dispensing liquid cleaning agent from a plurality of nozzles of a printhead cleaning device (for example, the printhead cleaning device according to the first aspect of the invention); firstly, moving the printhead over the printhead cleaning device so that an output area of ​​the printhead is at least partially, for example, completely, wetted with the dispensed liquid cleaning agent; and then ceasing the dispensing of liquid cleaning agent.and subsequent, second movement of the printhead over the printhead cleaning device, so that the output area of ​​the printhead is at least partially, for example completely, wiped by a wiping element of the printhead cleaning device, wherein liquid cleaning agent is dispensed during the first movement of the printhead over the printhead cleaning device and no liquid cleaning agent is dispensed during the second movement of the printhead over the printhead cleaning device.

[0055] This allows for efficient (thorough and / or reliable) cleaning of the print head. Furthermore, components can be reliably manufactured using binder jetting in 3D printing.

[0056] The first movement can, for example, occur in a first direction, and the second movement can, for example, occur in a second direction. The first direction and the second direction can, for example, be different from each other. The first direction and the second direction can, for example, be opposite to each other.

[0057] The method may, for example, further comprise: providing the printhead cleaning device according to the first aspect of the invention. The method may, for example, further comprise: rotating and / or adjusting the height of the carrier so that, during the first movement of the printhead over the printhead cleaning device, the wiping element does not make contact with the output area of ​​the printhead. The method may, for example, further comprise: rotating and / or adjusting the height of the carrier so that, during the second movement of the printhead over the printhead cleaning device, the wiping element makes contact with the output area of ​​the printhead in order to wipe the latter.

[0058] For example, during the second movement of the printhead over the printhead cleaning device, for example after wiping the printhead output area with the wiping element, the printhead can be moved over a suction device, for example the suction device described above, so that fluid adhering to the printhead output area is suctioned away.

[0059] According to a fifth aspect, a method for cleaning a wiper element of a printhead cleaning device (for example, the printhead cleaning device according to the first aspect of the invention) of a 3D printer (for example, the 3D printer according to the second aspect of the invention), which is configured to build a component layer by layer using binder jetting, may, for example, comprise: dispensing liquid cleaning agent from a plurality of nozzles of the printhead cleaning device, so that a liquid-filled bubble containing the cleaning agent is formed, in which at least one free end of the wiper element is received (for example, completely) for cleaning. The method may, for example, be carried out using the printhead cleaning device according to the first aspect of the invention. The method may, for example, further comprise: providing the printhead cleaning device according to the first aspect of the invention.

[0060] This allows, for example, the wiping element to be cleaned easily and / or reliably. Thus, the cleaning effect of a printhead cleaning device can be improved, and a printhead can be cleaned efficiently (thoroughly and / or reliably). Furthermore, components can be reliably manufactured using binder jetting in 3D printing.

[0061] According to a sixth aspect of the invention, a method for cleaning one or more printheads of a 3D printer (for example, the 3D printer according to the second aspect of the invention), which is configured to build a component layer by layer using binder jetting, comprises: dispensing a first liquid cleaning agent from a plurality of first nozzles of a printhead cleaning device (for example, the printhead cleaning device according to the first aspect of the invention) and simultaneously first moving a first printhead or a second printhead over the printhead cleaning device, such that a first section of an output area of ​​the first printhead is completely wetted with the first liquid cleaning agent or an output area of ​​the second printhead is completely wetted with the first liquid cleaning agent; subsequent, second moving of the first printhead or the second printhead over theprinthead cleaning device, such that the first section of the output area of ​​the first printhead is completely wiped by a wiping element of the printhead cleaning device, or an output area of ​​the second printhead is completely wiped by the wiping element of the printhead cleaning device; dispensing a second liquid cleaning agent, different from the first liquid cleaning agent, from a plurality of second nozzles of the printhead cleaning device, different from the first nozzles of the printhead cleaning device, and simultaneously, thirdly, moving the first printhead or a third printhead over the printhead cleaning device, such that a second section of the output area of ​​the first printhead is completely wetted with the second liquid cleaning agent, or an output area of ​​the third printhead is completely wetted with the second liquid cleaning agent; andSubsequent, fourth movement of the first printhead or the third printhead over the printhead cleaning device, such that the second section of the output area of ​​the first printhead is completely wiped by the wiping element of the printhead cleaning device, or an output area of ​​the third printhead is completely wiped by the wiping element of the printhead cleaning device. For example, no liquid cleaning agent may be dispensed during the second and / or fourth movement of the printheads (for example, the first printhead and / or the second printhead and / or the third printhead) over the printhead cleaning device. The method can be carried out, for example, with the printhead cleaning device according to the first aspect of the invention. The method may further comprise, for example: providing the printhead cleaning device according to the first aspect of the invention. For example, the majority ofThe first nozzles form the first nozzle row described above. For example, the majority of second nozzles can form the second nozzle row described above.

[0062] This allows one or more printheads to be cleaned efficiently (thoroughly and / or reliably). Furthermore, components can be reliably manufactured using binder jetting in 3D printing.

[0063] According to a seventh aspect of the invention, a method for preserving (for example, and subsequently recommissioning and / or uncovering and / or cleaning) a printhead of a 3D printer (for example, the 3D printer according to the second aspect of the invention), which is configured to build a component layer by layer by means of binder jetting, comprises: dispensing a liquid preservative from a plurality of first nozzles of a printhead cleaning device (for example, the printhead cleaning device according to the first aspect of the invention) and simultaneously first moving the printhead over the printhead cleaning device, such that an output area of ​​the printhead is at least partially, for example, completely, wetted with the preservative, for example, to preserve the output area of ​​the printhead.For example, to close and / or seal the printhead nozzle openings; and dispensing a liquid cleaning agent from a plurality of secondary nozzles of the printhead cleaning device, which are distinct from the primary nozzles of the printhead cleaning device, and simultaneously moving the printhead a third time over the printhead cleaning device, so that an output area of ​​the printhead is at least partially, for example, completely, wetted with the liquid cleaning agent, for example, to at least partially remove the preservative from the output area of ​​the printhead, for example, to at least partially expose the printhead nozzle openings. For example, after the first and / or third movement of the printhead over the printhead cleaning device, a subsequent second and / or fourth movement of the printhead over the printhead cleaning device may occur.in which the output area of ​​the printhead is at least partially, for example completely, wiped by a wiping element of the printhead cleaning device. For example, after the printhead has passed over the printhead cleaning device a second time, a method for cleaning the wiping element can be carried out, for example, the method for cleaning a wiping element according to the fifth aspect of the invention. The method can, for example, be carried out with the printhead cleaning device according to the first aspect of the invention. The method can, for example, further comprise: providing the printhead cleaning device according to the first aspect of the invention. For example, the plurality of first nozzles can form the first nozzle row described above. For example, the plurality of second nozzles can form the second nozzle row described above.

[0064] This allows the printhead's output area to be preserved simply and / or efficiently (thoroughly and / or reliably) (for example, if the printhead is not being used for an extended period and / or is to be stored) and subsequently put back into operation. Furthermore, components can be reliably manufactured using binder jetting in 3D printing.

[0065] According to an eighth aspect of the invention, the printhead cleaning device according to the first aspect of the invention can be used, for example, to preserve a printhead, such as a binder jetting printhead, of a 3D printer, such as the 3D printer according to the second aspect of the invention. For this purpose, the method for preserving a printhead according to the seventh aspect of the invention can be carried out, for example.

[0066] The printhead cleaning device according to the first aspect of the invention, or its control device, can, for example, be configured to perform one or more of the methods according to the fourth, fifth, sixth, and seventh aspects of the invention. The 3D printer according to the second aspect of the invention, or its control device, can, for example, be configured to perform one or more of the methods according to the fourth, fifth, sixth, and seventh aspects of the invention.

[0067] Exemplary, but not limiting, embodiments of the invention are shown in the figures and are explained in more detail below. Fig. Figures 1-4 show different perspective views of a printhead cleaning device for a 3D printer according to a first embodiment of the invention. Fig. 5 shows a top view of the in Fig. 1-4 Printhead cleaning device shown for a 3D printer. Fig. Figure 6 shows a sectional view of the in Fig. 1-4 printhead cleaning device for a 3D printer, wherein the section along the in Fig. The section line S1 shown in section 5 was carried out. Fig. Figure 7 shows a different sectional view of the in Fig. 1-4 printhead cleaning device for a 3D printer, wherein the section along the in Fig. The section line S2 shown in section 5 was carried out. Fig. 8 and Fig. Figure 9 shows different perspective views of the carrier with the wiper element attached to it. Fig. 1-4 shows a printhead cleaning device for a 3D printer. Fig. Figure 10 shows a perspective view of the support of the in Fig. 1-4 shows a printhead cleaning device for a 3D printer. Fig. Figure 11 shows a perspective view of the wipe element of the in Fig. 1-4 shows a printhead cleaning device for a 3D printer. Fig. Figure 12 shows a front view of the wiper element or a sectional view of the wiper element as shown in Fig. 1-4 shows a printhead cleaning device for a 3D printer. Fig. Figure 13 shows a perspective view of a printhead cleaning device for a 3D printer according to a second embodiment of the invention. Fig. Figure 14 shows a top view of the in Fig. 13. Printhead cleaning device shown for a 3D printer. Fig. Figure 15 shows a different perspective view of the in Fig. 13. Printhead cleaning device shown for a 3D printer. Fig. Figures 16-19 show different perspective views of a printhead cleaning device for a 3D printer according to a third embodiment of the invention. Fig. 20 shows a top view of the in Fig. 16-19 shows a printhead cleaning device for a 3D printer. Fig. 21 shows a cross-sectional view of the in Fig. 16-19 printhead cleaning device for a 3D printer, wherein the section along the Fig. The section line S3 shown in section 20 was carried out. Fig. Figure 22 shows a different sectional view of the [image / structure]. Fig. 16-19 printhead cleaning device for a 3D printer, wherein the section along the Fig. The section line S4 shown in section 20 was carried out. Fig. 23 and Fig. Figures 24 show different perspective views of the carrier with the wiper element attached to it. Fig. Printhead cleaning device for a 3D printer shown in Figures 16-19. Fig. 25 and Fig. Figure 26 shows different perspective views of a printhead cleaning device for a 3D printer according to a fourth embodiment of the invention. Fig. Figure 27 shows a sectional view of a printhead cleaning device for a 3D printer according to a fifth embodiment of the invention. Fig. Figure 28 shows a sectional view of a 3D printer according to a sixth embodiment of the invention.

[0068] The following description refers to the accompanying figures, which form part of this document and in which specific embodiments of the invention are shown for illustration.

[0069] It is understood that other embodiments may be used and structural or logical modifications made without deviating from the scope of protection of the present invention. It is understood that the features of the embodiments described herein may be combined with one another, unless specifically stated otherwise. The following description is therefore not to be interpreted in a restrictive sense, and the scope of protection of the present invention is defined by the appended claims.

[0070] Within the scope of this description, terms such as "connected", "attached" and "coupled" can be used to describe both a direct and an indirect connection, a direct or indirect connection, and a direct or indirect coupling.

[0071] In the figures, identical or similar elements are provided with identical reference symbols where appropriate.

[0072] As shown in the figures, a printhead cleaning device 10 according to the invention for a 3D printer configured to build a component layer by layer using binder jetting has a carrier 12 on which a wiping element 14 is arranged and which has a plurality of nozzles 16 configured to dispense liquid cleaning agent (see, for example, Fig. 1-7, 13, 14, 16-22, 25, 27 and 28).

[0073] For example, in Fig. 27 and Fig. As shown in Figure 28, the wiping element 14 and the nozzles 16 can, for example, be configured and / or arranged on the carrier 12 such that the wiping element 14, at least partially, for example a free end section thereof, can be wetted by the liquid cleaning agent dispensed from the nozzles 16, for example by being rinsed around and / or rinsed off.

[0074] For example, in Fig. As shown in Figure 28, the nozzles 16 can, for example, be configured and / or arranged on the carrier 12 such that an output area 62 of a printhead 56 to be cleaned can be wetted by the liquid cleaning agent that can be dispensed from the nozzles 16 when the printhead 56 is arranged above the printhead cleaning device 10.

[0075] For example, in Fig. As shown in Figures 1-5, 13, 14, 16-20 and 25, the support 12 can, for example, be supported on a retaining structure 18 of the printhead cleaning device 10, for example, on a retaining structure 18 that forms a trough-shaped recess 20. The support 12 can, for example, be supported on two opposing side walls 22, 24 of the recess 20 formed by the retaining structure 18. Alternatively or additionally, the support 12 can, for example, be supported on a base 26 of the recess 20 formed by the retaining structure 18.

[0076] The recess 20 can, for example, be designed to collect or gather liquid cleaning agent dispensed by the nozzles 16, such as that dispensed by the nozzles 16 towards the printhead 56. For example, the recess 20 can be designed to collect or gather material detached and / or wiped off by the printhead 56 or its output area 62. See, for example, Fig. 27 and Fig. 28.

[0077] For example, in Fig. As shown in Figures 3-7, 14-16, 18, 20-22 and 26-28, the recess 20 can, for example, have an outlet 72, which can be located, for example, in a side wall and / or a bottom 26 of the recess 20. Material collected or gathered in the recess 20 can be drained through the outlet 72.

[0078] The support 12 can, for example, be rotatably and / or height-adjustably supported on the retaining structure 18. The support 12 can, for example, be rotatably mounted on two opposing side walls 22, 24 of the recess 20 formed by the retaining structure. As, for example, in Fig. As shown in Figures 16-19, 21, 22, 25 and 26, the printhead cleaning device 10 can, for example, have a lifting drive 66 for adjusting the height of the support structure 18 and / or the carrier 12. The lifting drive 66 can, for example, be supported on side walls 22, 24 of the recess 20. As shown, for example, in Fig. As shown in Figures 3-5, 7, 14-17, 20, 22 and 26, the printhead cleaning device 10 can, for example, have a rotary drive 28 for rotating the carrier 12. The rotary drive 28 can, for example, be arranged on a side wall 24 of the recess 20. As shown, for example, in Fig. 6, Fig. 7, Fig. 21, Fig. 22, Fig. 27 and Fig. As shown in Figure 28, the support 12 can, for example, be arranged at least partially, or completely, in the recess 20.

[0079] For example, in Fig. 5, Fig. 8, Fig. 10 and Fig. As shown in Figure 20, the nozzles 16 can, for example, form at least one first row of nozzles 30 in which a plurality of nozzles 16 are arranged one behind the other along the wiper element 14 and adjacent to it on the carrier 12. As shown, for example, in Fig. 5 and Fig. As shown in Figure 20, for example, a longitudinal axis L3 of the wiper element 14 and a longitudinal axis L1 of the first row of nozzles 30 can be parallel to each other.

[0080] For example, in Fig. 5, Fig. 9, Fig. 10 and Fig. As shown in Figure 20, the nozzles 16 can, for example, further form a second row of nozzles 32, in which a plurality of nozzles 16 are arranged one behind the other along the wiper element 14 and adjacent to it on the carrier 12. As shown, for example, in Fig. 5 and Fig. As shown in Figure 20, the first row of nozzles 30 (or the nozzles 16 that form the first row of nozzles 30) and the second row of nozzles 32 (or the nozzles 16 that form the second row of nozzles 32) can be arranged on different sides of the wiper element 14. For example, as shown in Fig. 5 and Fig. As shown in Figure 20, the longitudinal axis L3 of the wiper element 14 and a longitudinal axis L2 of the second nozzle row 32 can be parallel to each other. For example, the longitudinal axis L1 of the first nozzle row 30 and the longitudinal axis L2 of the second nozzle row 32 can be parallel to each other.

[0081] For example, in Fig. 6, Fig. 7, Fig. 8, Fig. 21 and Fig. As shown in Figure 22, the carrier 12 can, for example, have a first line 34 which is fluidly connected to the first nozzle row 30 (or the nozzles 16 which form the first nozzle row 30), and a separate second line 36 which is fluidly connected to the second nozzle row 32 (or the nozzles 16 which form the second nozzle row 32).

[0082] For example, in Fig. 21 and Fig. As shown in Figure 22, the first line 34 can, for example, have a first line section 34a, which is fluidly connected to a first section 30a of the first nozzle row 30 (or the nozzles 16 that form section 30a), and a separate second line section 34b, which is fluidly connected to a second section 30b of the first nozzle row 30 (or the nozzles 16 that form section 30b), and / or the second line 36 can, for example, have a third line section 36a, which is fluidly connected to a first section 32a of the second nozzle row 32 (or the nozzles 16 that form section 32a), and a separate fourth line section 36b, which is fluidly connected to a second section 32b of the second nozzle row 32 (or the nozzles 16 that form section 32b).

[0083] For example, in Fig. 6, Fig. 8, Fig. 9, Fig. 11, Fig. 12, Fig. 21, Fig. 23, Fig. 24, Fig. 27 and Fig. As shown in Figure 28, the wiping element 14 can, for example, form one, two, or more wiping lips 38, 40. For example, in Fig. 6, Fig. 11, Fig. 12 and Fig. As shown in Figure 21, the wiping element 14 can have a Y-shape in cross-section, one leg of which is held by the support 12, and the two remaining legs each form a wiping lip 38, 40. For example, two or more wiping lips 38, 40 can be different from each other, for example, having different geometric cross-sectional shapes, for example, to achieve different cleaning effects, and / or for example, being made of different materials, for example, to achieve different wiping effects. As shown, for example, in Fig. 11 and Fig. As shown in Figure 12, for example, a free end of a first wiper lip 38 can have a round shape in cross-section, and / or a free end of a second wiper lip 40 can have a tapered shape in cross-section, for example, a trapezoidal shape, for example, an isosceles trapezoid. For example, a first wiper lip 38 can have a felt or sponge, for example, to assist in cleaning the output area 62 of the printhead 56 to be cleaned, and / or a second wiper lip 40 can have a rubber, for example, to assist in drying the output area 62 of the printhead 56 to be cleaned. As shown, for example, in Fig. As shown in Figures 8-10, the wiper element 14 can, for example, be arranged interchangeably on the carrier 12.

[0084] For example, in Fig. 8, Fig. 9, Fig. 23 and Fig. As shown in Figure 24, the carrier 12 can, for example, form a flat surface 42, for example a strip-shaped flat surface, in which the nozzle openings 44 of the nozzles 16 open and from which the wiper element 14 projects.

[0085] For example, in Fig. 23 and Fig. As shown in Figure 24, the carrier 12 can, for example, have a first part 12a (for example, an upper part) and a second part 12b (for example, a lower part). For example, the wiping element 14 can be arranged on the first part 12a, and / or the first part 12a can have the nozzles 16, and / or the first part 12a can have the first line 34 and / or the second line 36, and / or the first part can form the (strip-shaped) flat surface 42. For example, the second part 12b can be supported and / or rotatably mounted on the retaining structure 18 or the recess 20.

[0086] For example, in Fig. As shown in Figures 13-15, 25 and 26, the printhead cleaning device 10 can further include, for example, a suction device 46 which has an elongated suction slot 48 and is configured to suction fluid, for example from the printhead 56 to be cleaned, through the elongated suction slot 48. As shown, for example, in Fig. As shown in Figure 14, the extraction device 46 can, for example, be arranged such that a longitudinal axis L5 of the extraction gap 48 and a longitudinal axis L4 of the support 12 and / or the longitudinal axis L3 of the wiping element 14 and / or the longitudinal axis L1 of the first row of nozzles 30 and / or the longitudinal axis L2 of the second row of nozzles 32 are arranged parallel to each other.

[0087] The suction device 46 can, for example, include a vacuum pump (not shown in the figures) with which, for example, a fluid flow can be generated through the suction gap 48. As, for example, in Fig. As shown in Figures 13-15, 25 and 26, the suction device 46 can, for example, be arranged adjacent to the holding structure 18 or the recess 20, for example on a side wall of the recess 20. The suction device 46 can, for example, have a trough that is partially covered by a cover forming the suction gap 48. The cover can, for example, be detachably attached to the suction device 46, for example by means of one or more screws. The suction device can, for example, have one or more suction openings 64, which are provided, for example, in the bottom of the trough. The suction gap 48, the trough and / or the suction openings 64 can, for example, be fluid-connected to each other. The vacuum pump can, for example, be fluid-connected to the suction gap 48, the trough and / or the suction openings 64. The vacuum pump can, for example, be fluid-connected to the suction openings 64 via a vacuum line.

[0088] For example, in Fig. As shown in Figure 27, the printhead cleaning device 10 can, for example, further comprise a control device 68, which can, for example, be configured to variably adjust the volume flow of the liquid cleaning agent exiting the nozzles 16, for example by controlling a pump 50 and / or a valve 52, wherein optionally the volume flow can be variably adjusted by the control device 68 such that a liquid bubble 54 filled with the liquid cleaning agent is formed, in which at least one free end section of the wiper element 14 is received. The volume flow can, for example, be variably adjusted by the control device 68 such that the height of the liquid bubble 54 filled with the liquid cleaning agent is variably adjustable.

[0089] The printhead cleaning device 10 can, for example, further comprise at least one (not shown in the figures) cleaning agent container, for example for receiving the liquid cleaning agent. As, for example, in Fig. As shown in Figure 27, the printhead cleaning device 10 can, for example, further comprise at least one pump 50, for example, configured to supply the liquid cleaning agent from the cleaning agent reservoir to the nozzles 16. For example, the printhead cleaning device 10 can further comprise at least one cleaning agent line that fluidly connects the cleaning agent reservoir to the nozzles 16 or to the first and / or second line 34, 36. For example, the pump 50 can be arranged in the cleaning agent line, for example, downstream of the cleaning agent reservoir and / or upstream of the nozzles 16 or the first and / or second line 34, 36. For example, the printhead cleaning device 10 can further comprise at least one valve 52, for example, arranged in the cleaning agent line, for example, downstream of the pump 50 and / or upstream of the nozzles 16 or the first and / or second line 34, 36.The cleaning agent line can, for example, connect the cleaning agent container and / or the pump 50 and / or the valve 52 and / or the nozzles 16 and / or the first and / or second lines 34, 36. For example, the pump 50 and / or the valve 52 can be controlled by the control device 68.

[0090] For example, in Fig. 1, Fig. 2, Fig. 16 and Fig. As shown in Figure 17, the carrier 12 can, for example, have connections 74 to which supply lines (for example, for supplying the liquid cleaning agent, for example, the cleaning agent line) can be connected, for example, which connect the pump 50 and / or the valve 52 and / or the cleaning agent container to the connections 74. The connections can, for example, be coupled or connected (directly) to the first or second line 34, 36. For example, the connections 74 can serve to connect the nozzles 16 or the first and / or second line 34, 36 to the pump 50 and / or the valve 52 and / or the cleaning agent container. As shown, for example, in Fig. 16, Fig. 17, Fig. 19 and Fig. As shown in Figure 20, the recess 20 can, for example, have feedthrough connections 76 which are arranged in side walls of the recess 20 and which serve, for example, to guide the cleaning agent line through the side walls of the recess 20.

[0091] For example, in Fig. As shown in Figures 1-7, 13-16, 18-22, 25 and 26, the printhead cleaning device 10 can, for example, further include a level sensor 70. For example, the level sensor 70 can be arranged in a side wall of the recess 20. The level sensor 70 can, for example, determine or detect the level of material (e.g., fluid) received or collected in the recess 20.

[0092] A 3D printer 58 according to the invention can, for example, have the printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention) and a printhead 56 for selectively printing particle material using the binder jetting process (see, for example, Fig. 28).

[0093] For example, in Fig. As shown in Figure 28, the 3D printer 58 can further, for example, have a control device 60 which can be configured, for example, to move the printhead 56 over the printhead cleaning device 10 for cleaning. For example, the control device 60 can be configured to, during a first movement of the printhead 56 over the printhead cleaning device 10, dispense liquid cleaning agent from the nozzles 16 such that an output area 62 of the printhead 56 is at least partially, for example completely, wetted with liquid cleaning agent, and during a second movement of the printhead 56 over the printhead cleaning device 10, not to dispense any liquid cleaning agent from the nozzles 16.For example, the control device 60 can be configured to adjust the carrier 12 to a second position (for example, to adjust its height and / or rotate it, for example, by actuating the lifting drive 66 and / or the rotary drive 28) during the second movement of the printhead 56 over the printhead cleaning device 10, in which the wiping element 14 is in contact with the output area 62 of the printhead 56, and optionally, during the first movement of the printhead 56 over the printhead cleaning device 10, to adjust the carrier 12 to a first position (for example, to adjust its height and / or rotate it, for example, by actuating the lifting drive 66 and / or the rotary drive 28) in which the wiping element 14 is not in contact with the output area 62 of the printhead 56.

[0094] For example, in Fig. As shown in Figure 27, the output area 62 of the printhead 56 can, for example, be moved or be moved in a plane E over the printhead cleaning device 10, so that the output area 62 of the printhead 56 has contact with the wiping element 14 when the printhead 56 is moved over the printhead cleaning device 10. For example, by raising the printhead 56 and / or by adjusting the carrier 12 (for example by rotating and / or adjusting the height of the carrier 12) and / or by lowering the wiper element 14 and / or the carrier 12, the output area 62 of the printhead 56 and the wiper element 14 can be moved away from each other in the vertical direction, so that the output area 62 of the printhead 56 does not have contact with the wiper element 14 when the printhead 56 is moved over the printhead cleaning device 10.For example, the liquid bladder 54 filled with the liquid cleaning agent can be adjusted such that the liquid bladder 54 extends vertically beyond a free end of the wiper element 14, so that the output area 62 of the printhead 56 can be wetted with liquid cleaning agent without the output area 62 of the printhead 56 making contact with the wiper element 14 when the printhead 56 is moved over the printhead cleaning device 10 (see, for example, ). Fig. 28).

[0095] The printhead cleaning device 10 and the 3D printer 58 can, for example, have a common control device. The control device 68 of the printhead cleaning device and the control device 60 of the 3D printer can, for example, be formed by a common control device.

[0096] The printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention) can, for example, be used according to the invention for cleaning and / or preserving a printhead 56, for example, a binder jetting printhead 56, of a 3D printer 58.

[0097] A method according to the invention for cleaning a printhead 56 of a 3D printer (for example, the 3D printer described above, for example, the 3D printer according to the sixth embodiment of the invention), which is configured to build a component layer by layer using binder jetting, comprises: dispensing liquid cleaning agent from a plurality of nozzles 16 of a printhead cleaning device 10 (for example, the printhead cleaning device described above, for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention); first, moving the printhead 56 over the printhead cleaning device 10 so that an output area 62 of the printhead 56 is at least partially, for example, completely, wetted with the dispensed liquid cleaning agent; cessation of the dispensing of liquid cleaning agent;and subsequent, second movement of the printhead 56 over the printhead cleaning device 10, so that the output area 62 of the printhead 56 is at least partially, for example completely, wiped by a wiping element 14 of the printhead cleaning device 10, wherein liquid cleaning agent is dispensed during the first movement of the printhead 56 over the printhead cleaning device 10 and no liquid cleaning agent is dispensed during the second movement of the printhead 56 over the printhead cleaning device 10.

[0098] For example, the first movement can be in a first direction and the second movement can be in a second direction, where the first direction and the second direction are different from each other, and optionally the first direction and the second direction can be opposite to each other.

[0099] For example, the method may further comprise: providing the printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention). For example, the method may further comprise: rotating and / or adjusting the height of the carrier 12 so that, during the first movement of the printhead 56 over the printhead cleaning device 10, the wiping element 14 does not make contact with the output area 62 of the printhead 56. For example, the method may further comprise: rotating and / or adjusting the height of the carrier 12 so that, during the second movement of the printhead 56 over the printhead cleaning device 10, the wiping element 14 makes contact with the output area 62 of the printhead 56 in order to wipe the latter.

[0100] For example, during the second movement of the printhead 56 over the printhead cleaning device 10, for example after wiping the output area 62 of the printhead 56 with the wiping element 14, the printhead 56 can be moved over a suction device 46 so that fluid adhering to the output area 62 of the printhead 56 is suctioned away.

[0101] A method for cleaning a wiper element 14 of a printhead cleaning device 10 (for example, the printhead cleaning device described above, for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention) of a 3D printer (for example, the 3D printer described above, for example, the 3D printer according to the sixth embodiment of the invention), which is configured to build a component layer by layer by means of binder jetting, may, for example, comprise: dispensing liquid cleaning agent from a plurality of nozzles 16 of the printhead cleaning device 10, so that a liquid bubble 54 filled with cleaning agent is formed in which at least one free end of the wiper element 14 is (completely) received for cleaning (see, for example, Fig. 27 and Fig. 28).

[0102] For example, the method may further comprise: providing the printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention).

[0103] An inventive method for cleaning one or more printheads 56 of a 3D printer (for example, the 3D printer described above, for example, the 3D printer according to the sixth embodiment of the invention), which is configured to build a component layer by layer using binder jetting, comprises: dispensing a first liquid cleaning agent from a plurality of first nozzles 16 of a printhead cleaning device 10 (for example, the printhead cleaning device described above, for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention) and simultaneously first moving a first printhead 56 or a second printhead 56 over the printhead cleaning device 10,so that a first section of an output area 62 of the first printhead 56 is completely wetted with the first liquid cleaning agent, or an output area 62 of the second printhead 56 is completely wetted with the first liquid cleaning agent; subsequent, second movement of the first printhead 56 or the second printhead 56 over the printhead cleaning device 10, so that the first section of the output area 62 of the first printhead 56 is completely wiped by a wiping element 14 of the printhead cleaning device 10, or an output area 62 of the second printhead 56 is completely wiped by the wiping element 14 of the printhead cleaning device 10; dispensing a second liquid cleaning agent, different from the first liquid cleaning agent, from a plurality of second nozzles 16 of the printhead cleaning device 10.which are different from the first nozzles 16 of the printhead cleaning device 10, and simultaneously, a third movement of the first printhead 56 or a third printhead 56 over the printhead cleaning device 10, so that a second section of the output area 62 of the first printhead 56 is completely wetted with the second liquid cleaning agent, or an output area 62 of the third printhead 56 is completely wetted with the second liquid cleaning agent; and subsequent, fourth movement of the first printhead 56 or the third printhead 56 over the printhead cleaning device 10, so that the second section of the output area 62 of the first printhead 56 is completely wiped by the wiping element 14 of the printhead cleaning device 10, or an output area 62 of the third printhead 56 is completely wiped by the wiping element 14 of the printhead cleaning device 10.

[0104] For example, no liquid cleaning agent can be dispensed during the second and / or fourth movement of the printheads 56 over the printhead cleaning device 10.

[0105] For example, the method may further comprise: providing the printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention), wherein, for example, the plurality of first nozzles 16 form the first nozzle row 30 described above and the plurality of second nozzles 16 form the second nozzle row 32 described above.

[0106] An inventive method for preserving a printhead 56 of a 3D printer (for example, the 3D printer described above, for example, the 3D printer according to the sixth embodiment of the invention), which is configured to build a component layer by layer using binder jetting, comprises: dispensing a liquid preservative from a plurality of first nozzles 16 of a printhead cleaning device 10 (for example, the printhead cleaning device described above, for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention) and simultaneously first moving the printhead 56 over the printhead cleaning device 10, so that an output area 62 of the printhead 56 is at least partially, for example, completely, wetted with the preservative, for example, to preserve the output area 62 of the printhead 56.for example, to close and / or seal the nozzle openings of the printhead 56; and dispensing a liquid cleaning agent from a plurality of second nozzles 16 of the printhead cleaning device 10, which are different from the first nozzles 16 of the printhead cleaning device 10, and simultaneously, thirdly, moving the printhead 56 over the printhead cleaning device 10 so that an output area 62 of the printhead 56 is at least partially, for example, completely, wetted with the liquid cleaning agent, for example, to at least partially remove the preservative from the output area 62 of the printhead 56, for example, to at least partially expose the nozzle openings of the printhead 56.

[0107] For example, after the first and / or third movement of the printhead 56 over the printhead cleaning device 10, a subsequent second and / or fourth movement of the printhead 56 over the printhead cleaning device 10 can take place, in which the output area 62 of the printhead 56 is at least partially, for example completely, wiped by a wiping element 14 of the printhead cleaning device 10, and, for example, after the second and / or fourth movement of the printhead 56 over the printhead cleaning device 10, a method for cleaning the wiping element 14 can be carried out, for example the method for cleaning the wiping element 14 described above.

[0108] For example, the method may further comprise: providing the printhead cleaning device 10 described above (for example, the printhead cleaning device according to one of the first to fifth embodiments of the invention), wherein, for example, the plurality of first nozzles 16 form the first nozzle row 30 described above and the plurality of second nozzles 16 form the second nozzle row 32 described above.

[0109] Reference symbol list: 10: Printhead cleaning device; 12: Carrier; 12a, 12b: First part, second part; 14: Wiping element; 16: Nozzles; 18: Retaining structure; 20: Recess; 22, 24: Side walls; 26: Base; 28: Rotary drive; 30: First row of nozzles; 30a, 30b: First section, second section; 32: Second row of nozzles; 32a, 32b: First section, second section; 34: First line; 34a, 34b: First line section, second line section; 36: Second line; 36a, 36b: Third line section, fourth line section; 38, 40: Wiper lip, first wiper lip, second wiper lip; 42: Flat surface; 44: Nozzle openings; 46: Suction device; 48: (elongated) suction slot; 50: pump; 52: valve; 54: liquid bladder (filled with cleaning agent); 56: print head; 58: 3D printer; 60: control device; 62: output area; 64: suction openings; 66: lifting drive; 68: control device; 70: level sensor; 72: outlet; 74: connections; 76: feed-through connections; L1, L2, L3, L4, L5: longitudinal axes;E: Level;

Claims

[1] Printhead cleaning device (10) for a 3D printer configured to build a component layer by layer using binder jetting, wherein the printhead cleaning device (10) comprises: a carrier (12) on which a wiping element (14) is arranged and which has a plurality of nozzles (16) which are designed to dispense liquid cleaning agent, wherein the carrier (12) is rotatably supported on a holding structure (18) of the printhead cleaning device (10) and the printhead cleaning device (10) has a rotary drive (28) for rotating the carrier (12), and / or wherein the nozzles (16) form a first nozzle row (30) in which a plurality of nozzles (16) are arranged one after the other along the wiper element (14) and adjacent to it on the carrier (12), and a second nozzle row (32) in which a plurality of nozzles (16) are arranged one after the other along the wiper element (14) and adjacent to it on the carrier (12), and the first nozzle row (30) and the second nozzle row (32) are arranged on different sides of the wiper element (14), and / or wherein the wiper element (14) has a Y-shape in cross-section, one leg of which is held by the carrier (12) and the two remaining legs each form a wiper lip (38, 40) which are different from each other. [2] Printhead cleaning device (10) according to claim 1, wherein the wiping element (14) and the nozzles (16) are configured such that the wiping element (14) is at least partially wettable by the liquid cleaning agent dispensed from the nozzles (16), for example, by being rinsed and / or washed off. [3] Printhead cleaning device (10) according to claim 1 or 2, wherein the nozzles (16) are configured such that an output area (62) of a printhead (56) to be cleaned can be wetted by the liquid cleaning agent dispensed from the nozzles (16) when the printhead (56) is positioned above the printhead cleaning device (10). [4] Printhead cleaning device (10) according to one of claims 1 to 3, wherein the retaining structure (18) forms a trough-shaped depression (20), and the support (12) is supported, for example, on two opposite side walls (22, 24) of the depression (20) formed by the retaining structure (18). [5] Printhead cleaning device (10) according to any one of claims 1 to 4, wherein the printhead cleaning device (10) has a lifting drive (66) for adjusting the height of the holding structure (18), and / or wherein the support (12) is arranged at least partially, for example completely, in the recess (20) of claim 4. [6] Printhead cleaning device (10) according to one of claims 1 to 5, wherein a longitudinal axis (L3) of the wiping element (14) and a longitudinal axis (L1) of the first row of nozzles (30) are parallel to each other. [7] Printhead cleaning device (10) according to one of claims 1 to 6, wherein the longitudinal axis (L3) of the wiper element (14) and a longitudinal axis (L2) of the second row of nozzles (32) are parallel to each other. [8] Printhead cleaning device (10) according to any one of claims 1 to 7, wherein the carrier (12) has a first line (34) which is fluidly connected to the first row of nozzles (30), and a separate second line (36) which is fluidly connected to the second row of nozzles (32), and wherein optionally the first line (34) has a first line section (34a) which is fluidly connected to a first section (30a) of the first nozzle row (30), and a separate second line section (34b) which is fluidly connected to a second section (30b) of the first nozzle row (30), and the second line (36) has a third line section (36a) which is fluidly connected to a first section (32a) of the second nozzle row (32), and a separate fourth line section (36b) which is fluidly connected to a second section (32b) of the second nozzle row (32). [9] Printhead cleaning device (10) according to any one of claims 1 to 8, wherein the two wiper lips (38, 40) have different geometric cross-sectional shapes, for example to achieve different cleaning effects, wherein, for example, a free end of a first wiper lip (38) has a round cross-sectional shape and / or a free end of a second wiper lip (40) has a tapered cross-sectional shape, for example a trapezoidal shape, for example an isosceles trapezoidal shape, and / or, for example, are made of different materials, for example to achieve different wiping effects, wherein, for example, a first wiper lip (38) has a felt or sponge, for example to assist in cleaning the output area (62) of the printhead (56) to be cleaned, and / or a second wiper lip (40) has a rubber, for example to assist in drying the output area (62) of the printhead (56) to be cleaned, and / or wherein the wiping element (14) is interchangeably arranged on the carrier (12). [10] Printhead cleaning device (10) according to one of claims 1 to 9, wherein a flat surface (42), for example a strip-shaped flat surface, is formed on the carrier (12) in which the nozzle openings (44) of the nozzles (16) open and from which the wiping element (14) projects. [11] Printhead cleaning device (10) according to one of claims 1 to 10, further comprising a suction device (46) having one or more elongated suction slots (48) and being configured to draw fluid, for example from the printhead (56) to be cleaned, through the elongated suction slot(s) (48), wherein optionally the suction device (46) is arranged such that longitudinal axes (L5) of the suction slots (48) and a longitudinal axis (L4, L3, L1, L2) of the carrier (12) and / or the wiping element (14) and / or the first row of nozzles (30) and / or the second row of nozzles (32) are arranged parallel to each other. [12] Printhead cleaning device (10) according to one of claims 1 to 11, further comprising a control device (68) which is configured to variably adjust a volume flow of the liquid cleaning agent exiting the nozzles (16), for example by controlling a pump (50) and / or a valve (52), wherein optionally the volume flow can be variably adjusted by the control device (68) such that a liquid bubble (54) filled with the liquid cleaning agent is formed in which at least one free end section of the wiper element (14) is received, and wherein optionally the volume flow can be variably adjusted by the control device (68) such that the height of the liquid bubble (54) filled with the liquid cleaning agent is variably adjustable. [13] 3D printer (58), having a printhead cleaning device (10) comprising a carrier (12) on which a wiping element (14) is arranged and which has a plurality of nozzles (16) which are configured to dispense liquid cleaning agent, a printhead (56) for selectively printing particle material using the binder jetting process and a control device (60) which is configured to move the printhead (56) over the printhead cleaning device (10) for cleaning and, during a first movement of the printhead (56) over the printhead cleaning device (10), to dispense liquid cleaning agent from the nozzles (16) in such a way that an output area (62) of the printhead (56) is at least partially, for example completely, wetted with liquid cleaning agent, and, during a second movement of the printhead (56) over the printhead cleaning device (10), to dispense no liquid cleaning agent from the nozzles (16). [14] 3D printer (58) according to claim 13, wherein the control device (60) is further configured to adjust the carrier (12) to a second position in which the wiper element (14) is in contact with the output area (62) of the print head (56) during the second movement of the print head (56) over the print head cleaning device (10), and optionally to adjust the carrier (12) to a first position in which the wiper element (14) is not in contact with the output area (62) of the print head (56) during the first movement of the print head (56) over the print head cleaning device (10). [15] Use of the printhead cleaning device (10) according to any one of claims 1 to 12 for cleaning and / or preserving a printhead (56), for example a binder jetting printhead (56) of a 3D printer (58). [16] Method for cleaning a print head (56) of a 3D printer which is set up to build a component layer by layer using binder jetting, wherein the method comprises: Dispensing liquid cleaning agent from a plurality of nozzles (16) of a printhead cleaning device (10), first movement of the printhead (56) over the printhead cleaning device (10) so that an output area (62) of the printhead (56) is at least partially, for example completely, wetted with the dispensed liquid cleaning agent, Stopping the dispensing of liquid cleaning agent, and subsequent, second movement of the printhead (56) over the printhead cleaning device (10), so that the output area (62) of the printhead (56) is at least partially, for example completely, wiped by a wiping element (14) of the printhead cleaning device (10), wherein liquid cleaning agent is dispensed on the first movement of the printhead (56) over the printhead cleaning device (10) and no liquid cleaning agent is dispensed on the second movement of the printhead (56) over the printhead cleaning device (10). [17] Method according to claim 16, wherein the first movement is in a first direction and the second movement is in a second direction, wherein the first direction and the second direction are different from each other, and wherein optionally the first direction and the second direction are opposite to each other. [18] Method according to claim 16 or 17, further comprising: Providing a printhead cleaning device (10) according to any one of claims 1 to 12, and optionally Rotating and / or adjusting the height of the carrier (12) so that, when the printhead (56) is first moved over the printhead cleaning device (10), the wiping element (14) does not make contact with the output area (62) of the printhead (56), and / or Rotating and / or adjusting the height of the carrier (12) so that, during the second movement of the printhead (56) over the printhead cleaning device (10), the wiping element (14) makes contact with the output area (62) of the printhead (56) in order to wipe the latter. [19] Method according to one of claims 16 to 18, wherein, during the second movement of the printhead (56) over the printhead cleaning device (10), for example after wiping the output area (62) of the printhead (56) with the wiping element (14), the printhead (56) is moved over a suction device (46) so that fluid adhering to the output area (62) of the printhead (56) is suctioned away. [20] Method for cleaning one or more print heads (56) of a 3D printer set up to build a component layer by layer using binder jetting, the method comprising: Dispensing a first liquid cleaning agent from a plurality of first nozzles (16) of a printhead cleaning device (10) and simultaneously first moving a first printhead (56) or a second printhead (56) over the printhead cleaning device (10) so that a first section of an output area (62) of the first printhead (56) is completely wetted with the first liquid cleaning agent or an output area (62) of the second printhead (56) is completely wetted with the first liquid cleaning agent, subsequent, second movement of the first printhead (56) or the second printhead (56) over the printhead cleaning device (10), so that the first section of the output area (62) of the first printhead (56) is completely wiped by a wiping element (14) of the printhead cleaning device (10) or an output area (62) of the second printhead (56) is completely wiped by the wiping element (14) of the printhead cleaning device (10), Dispensing a second liquid cleaning agent, different from the first liquid cleaning agent, from a plurality of second nozzles (16) of the printhead cleaning device (10), which are different from the first nozzles (16) of the printhead cleaning device (10), and simultaneously moving the first printhead (56) or a third printhead (56) over the printhead cleaning device (10) so that a second section of the dispensing area (62) of the first printhead (56) is completely wetted with the second liquid cleaning agent, or a dispensing area (62) of the third printhead (56) is completely wetted with the second liquid cleaning agent, and subsequent, fourth movement of the first printhead (56) or the third printhead (56) over the printhead cleaning device (10), so that the second section of the output area (62) of the first printhead (56) is completely wiped by the wiping element (14) of the printhead cleaning device (10) or an output area (62) of the third printhead (56) is completely wiped by the wiping element (14) of the printhead cleaning device (10), where, optionally, no liquid cleaning agent is dispensed during the second and / or fourth movement of the printheads (56) over the printhead cleaning device (10). [21] Method for preserving a print head (56) of a 3D printer set up to build a component layer by layer using binder jetting, the method comprising: Dispensing a liquid preservative from a plurality of first nozzles (16) of a printhead cleaning device (10) and simultaneously first moving the printhead (56) over the printhead cleaning device (10) so that a dispensing area (62) of the printhead (56) is at least partially, for example completely, wetted with the preservative, for example to preserve the dispensing area (62) of the printhead (56), for example to close and / or seal nozzle openings of the printhead (56), and Dispensing a liquid cleaning agent from a plurality of second nozzles (16) of the printhead cleaning device (10), which are distinct from the first nozzles (16) of the printhead cleaning device (10), and simultaneously moving the printhead (56) over the printhead cleaning device (10) so that an output area (62) of the printhead (56) is at least partially, for example completely, wetted with the liquid cleaning agent, for example to at least partially remove the preservative from the output area (62) of the printhead (56), for example to at least partially expose the nozzle openings of the printhead (56), wherein optionally after the first and / or third movement of the printhead (56) over the printhead cleaning device (10), a subsequent second and / or fourth movement of the printhead (56) over the printhead cleaning device (10) takes place, in which the output area (62) of the printhead (56) is at least partially, for example completely, wiped by a wiping element (14) of the printhead cleaning device (10), and wherein furthermore optionally after the second movement of the printhead (56) over the printhead cleaning device (10), a method for cleaning the wiping element (14) is carried out, for example the method according to claim 20. [22] Method according to claim 20 or 21, further comprising providing a printhead cleaning device (10) according to any one of claims 1 to 12, wherein optionally the plurality of first nozzles (16) form the first nozzle row (30) and the plurality of second nozzles (16) form the second nozzle row (32).

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