DE102015206813A1 - Apparatus and method for applying a fluid to a workpiece carrier for producing a workpiece and system for producing a workpiece - Google Patents

Abstract

The present invention provides a device (10; 110; 210) and a method for dispensing a fluid (F) and a system for producing a workpiece. The device is formed with: a reservoir (12) into which the fluid (F) can be introduced; an outlet device (14; 114), by means of which the fluid (F) can be dispensed from the device (10; 110; 210); an actuator device (20; 120), by means of which a volume of the reservoir (12) for generating a pressure wave in the fluid (F) introduced into the reservoir (12) can be reduced in size; and a control device (30), by means of which the actuator device (20; 120) is controllable to reduce the volume of the reservoir (12) such that the fluid (F) introduced into the reservoir (12) flows over the pressure wave Outlet means (14; 114) at least partially from the device (10; 110; 210) is output.

Description

The present invention relates to an apparatus and a method for applying a fluid, in particular a liquid, for example a plastic melt, a molten metal or a food, to a workpiece carrier for producing a workpiece. Furthermore, the invention relates to a system for producing a workpiece by means of the applied fluid, in particular a 3D printer.

State of the art

Devices for precise dosing and targeted application of fluids are needed in a variety of applications. Particularly in the case of 3D printers, devices are used for the precise and metered dispensing of a plastic melt, so-called metering units, which bring a processed plastic melt in the form of drops. The molten plastic is forced out of the dosing unit by means of overpressure. A fast-switching nozzle closure with high-frequency piezo technology enables fast opening and closing movements and thus generates plastic droplets from the plastic melt. By assembling of hardening plastic droplets workpieces can be produced.

In the US 2012/156319 A1 [0006] There is described an apparatus for producing a three-dimensional object from a curable material, comprising at least one processing unit for processing the curable material in a liquid phase to deliver the material from a material reservoir via a dispensing unit in the form of discrete drops towards a design space. The locking mechanism comprises an elastically deformable solid-body joint.

In the previously known concepts for dispensing individual drops for 3D printing applications, the plastic melt must be discharged under pressure by means of a fast-switching piezoelectric actuator from the metering unit. A minimum achievable droplet size is limited due to the pressure to be achieved and the piezo-dynamics. Thus, the closing element of the nozzle closure (the nozzle needle) must be moved in the high-viscosity plastic melt, which in turn can greatly slow the movement. In addition, the needle is exposed to very high levels of wear, as many polymer melts can be corrosive.

Disclosure of the invention

The present invention discloses a device having the features of claim 1, a method having the features of claim 8 and a system having the features of claim 12.

Accordingly, there is provided an apparatus for applying a fluid to a workpiece carrier for producing a workpiece, comprising: a reservoir into which the fluid is insertable; an outlet device, by means of which the fluid can be dispensed from the device; an actuator device, by means of which a volume of the reservoir for generating a pressure wave in the introduced into the reservoir fluid is reduced in size; and a control device, by means of which the actuator device is controllable to reduce the volume of the reservoir such that the introduced into the reservoir fluid due to the generated pressure wave through the outlet device is at least partially output from the device and applied to the workpiece carrier.

The pressure wave is preferably a shock wave (also called shock wave or shock wave or shock wave or shock front) and / or a pressure pulse. By discharging a fluid from the device, it is to be understood, in particular, that the fluid dispensed as a drop no longer touches the fluid left in the reservoir of the device and the rest of the device.

Furthermore, a method for applying a fluid to a workpiece carrier for producing a workpiece is provided, comprising the steps of: introducing a fluid into a reservoir with an outlet device, by means of which the fluid can be dispensed; Reducing a volume of the reservoir such that in the fluid introduced into the reservoir, a pressure wave is generated such that the introduced into the reservoir fluid via the outlet device at least partially discharged from the reservoir and applied to the workpiece carrier for producing the workpiece.

Furthermore, a system for producing a workpiece is provided, comprising: a device according to the invention for dispensing a fluid; and a workpiece carrier on which the fluid can be applied by means of the device for producing the workpiece; wherein the outlet device of the device and the workpiece carrier are movable relative to each other.

The workpiece to be produced may preferably be a plastic component, a strip conductor structure or a piece of pastry or confectionery. The workpiece to be produced may in particular be a two- or three-dimensional workpiece. The workpiece carrier can in particular be movable in one, two or three dimensions.

Advantages of the invention

The invention describes a possibility of discharging or discharging a fluid, in particular a plastic melt, without quenching pressure from a device for dispensing a fluid, without the use of a nozzle closure. Thus, a global compression of the plastic melt and a piezoelectric actuator and a closing element can be dispensed with. As a result, the necessary technical effort for producing the device is reduced. In addition, due to the avoidance of a moving in the plastic melt closing element no minimum drop diameter can be realized, which can lead to an improved surface quality of by outputting the fluid to "printing" Aufformen. For example, by means of a 3D printer, a plastic melt can be used to print plastic designs, but if, for example, chocolate or a sugar mass is used as the fluid, confectionery decorations, for example, can be "printed" in a targeted manner. If a molten metal is discharged through the device, for example, power tracks can be "printable".

Furthermore, the present inventive principle has the potential to process fiber-reinforced plastics, which are only limited processable with previously known methods.

The present invention is based in part on the principle of an inkjet printer. Molten plastic, as an exemplary fluid, is delivered to the reservoir, which has a small hole as an outlet. By the, relatively fast, reduction and subsequent optional increase in the volume of the reservoir, a defined amount of plastic is discharged, that is spent. Time parameters of reducing, and optionally enlarging, the volume of the reservoir and a geometry of the reservoir and / or a cross-sectional area of the outlet means may serve to adjust or adjust the amount of fluid dispensed. A surface tension, especially at a suitable duration of flight, may be responsible for the formation of a single drop. The fluid preferably fills the entire reservoir of the device.

Preferably, the volume is reduced in size within a period of between ten and two hundred microseconds.

The actuator device can be designed such that the pressure wave is generated with such parameters, for example clock frequency, amplitude, etc., that the fluid is discharged in the desired amount. For this purpose, the actuator device may preferably be designed as an eddy current actuator.

Particularly advantageously, the device or method for dispensing a fluid having a viscosity of up to five Pascal seconds (Pascal times second) and / or up to the occurrence of pseudoplastic, d. H. shear thinning properties are used.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a further embodiment, the actuator device has a membrane formed in or as an outer wall of the reservoir, which tightly seals the actuator device for the fluid and which is deformable, in particular elastically deformable, for reducing the volume of the reservoir. A deformation of the membrane is to be understood as meaning, in particular, a modification of a present form of the membrane, that is to say that it should also be understood as meaning a return of the membrane from a bulged shape to the shape of the membrane at rest. The return of the membrane can be done actively via the actuators or passively via a preloaded spring.

The membrane may also be deformable to increase the volume of the reservoir, in particular to increase the reduced volume of the reservoir. The actuator means may be configured to deform the membrane to increase the volume of the reservoir. This should also be understood that the actuator device causes the membrane can return to a rest position.

The membrane of the device prevents other elements of the actuator device than the membrane from coming into contact with the fluid. This can improve a lifetime of the actuator device and thus of the device according to the invention. The membrane is preferably metallic, and more preferably has chromium, is chromium or is chromium-plated.

The actuator device may in particular be designed to deform the membrane such that from the deformation of the membrane a pressure wave, in particular a shock wave or a pressure pulse, is generated in the fluid which is located in the reservoir, which is responsible for the discharge of the fluid from the device in a desired amount is the cause.

According to a further preferred development, the actuator device has a piston, by means of which the membrane for reducing, and optionally also for enlarging, the volume of the reservoir is deformable. For example, the volume of the reservoir can be made smaller by the piston bulging the membrane into the reservoir. Preferably, the piston is formed separately from the membrane. Alternatively, the piston may be formed fixedly connected to the membrane. The piston may be configured to generate a pressure wave in the fluid in the reservoir by appropriately deforming the membrane.

According to a further preferred development, the actuator device has an eddy current actuator which can be controlled by means of the control device. The eddy current actuator comprises a coil which can be supplied with electric current in such a way that, due to the current flowing through the coil, the electromagnetic eddy currents, the piston for deforming the membrane is repelled by the coil. Thus, a particularly fast movement of the piston is made possible with a particularly high force. Accordingly, a minimum achievable droplet size can be advantageously reduced. The droplet size can, depending on the specific geometries and a current pulse course, for example, become smaller, the more current is supplied to the coil for generating the eddy currents. With ever stronger current the coil is energized, the higher the amplitude of the pressure wave. An increase in the amplitude of the pressure wave can lead to an increase in the exit velocity of the fluid.

According to a further preferred development, the membrane is an elastically deformable membrane which is designed to exert a force which counteracts deformation of the membrane by the piston. Thus, for example, the reduction of the volume of the reservoir by moving or pushing the piston against the membrane can be done such that the membrane is bulged toward the interior of the reservoir, in particular jerky. The optional subsequent enlargement of the volume of the reservoir can take place in that the force moving the piston extinguishes and the restoring force, which exerts the deformed membrane due to its elasticity, reverses the bulging of the membrane while pushing back the piston. In other words, the diaphragm can be used, on the one hand, to translate a force pulse of the piston into a volume reduction of the reservoir and, on the other hand, into a return of the piston for a subsequent, optional volume increase of the reservoir.

According to a further preferred development, the actuator device has a magnetic actuator which can be controlled by means of the control device, by means of which piston for deforming the membrane can be moved. For this purpose, the piston may be magnetic, in particular ferromagnetic or paramagnetic. By means of the magnetic actuator, the piston, for example, as described above, be moved in such a way that it bulges the membrane towards the interior of the reservoir and / or bulges the membrane by pushing or pulling towards the outside of the reservoir.

According to a further preferred development, the outlet device has a throttle which can be controlled by means of the control device to reduce or enlarge a cross-sectional area of an outlet from the reservoir. Thus, the throttle can be adjusted to the desired drop size in which the fluid is to be dispensed.

According to a preferred embodiment of the method according to the invention, reducing and / or increasing the volume of the reservoir comprises moving a piston for deforming a membrane which is formed in or as an outer wall of the reservoir, in particular for generating a pressure wave in the fluid in the reservoir Reservoir.

According to a further preferred development of the method according to the invention, moving the piston comprises energizing a coil such that the piston is expelled from the coil by electromagnetic eddy currents resulting from energizing the coil. In particular, the piston can be repelled such that it thereby bulges the membrane towards the inside of the reservoir for reducing the volume of the reservoir, in particular for generating a pressure wave in the fluid in the reservoir.

According to a further preferred development, the introduction of the fluid into the reservoir takes place continuously or regularly and / or in accordance with a control device. For this purpose, the device according to the invention as a conveyor a screw conveyor, in particular a heated screw conveyor, and / or for the inventive method, a screw conveyor, in particular a heatable screw conveyor, can be used. Alternatively, the introduction over a strand, d. H. a filament take place. The filament is printed by a conveyor into the reservoir. The heat input in the inlet in front of the reservoir due to the FDM printing principle leads to the melting of the filament.

Brief description of the drawings

The present invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures of the drawings. Show it:

1 a schematic block diagram of a device 10 for applying a fluid F to a workpiece carrier for producing a workpiece according to an embodiment of the present invention;

2 a schematic block diagram of a device 110 for applying a fluid F to a workpiece carrier for producing a workpiece according to another embodiment of the present invention;

3 a schematic exploded view of the device 110 out 2 ;

4 a schematic block diagram of a device 210 for applying a fluid F to a workpiece carrier 240 for producing a workpiece according to another embodiment of the present invention and a system 300 for producing a workpiece according to still another embodiment of the present invention; and

5 a schematic flow diagram for explaining a method for applying a fluid F to a workpiece carrier for producing a workpiece according to an embodiment of the present invention.

In all figures, the same or functionally identical elements and devices - unless otherwise stated - provided with the same reference numerals. The numbering of method steps is for the sake of clarity and, in particular, should not, unless otherwise indicated, imply a particular chronological order. In particular, several method steps can be carried out simultaneously.

Description of the embodiments

1 shows a schematic block diagram of a device 10 for applying a fluid F to a workpiece carrier for producing a workpiece according to an embodiment of the present invention. The device 10 has a reservoir 12 in, in which the fluid F can be introduced. According to some developments, the fluid from a heater in the reservoir 12 in particular, when the fluid F must be heated to an ambient temperature in order to become liquid or to obtain a favorable operating temperature and / or viscosity for dispensing through the device.

The device 10 also has an actuator device 20 on, by means of which the volume of the reservoir 12 for generating a pressure wave in the reservoir 12 introduced fluid F reducible and, optionally in particular after it has been reduced, can be enlarged. In particular, the volume of the reservoir 12 against a standard volume of the reservoir 12 which is the reservoir 12 in the normal state, that is to say, for example, when the actuator device is deactivated 20 has, reducible and then be resized. The enlarged volume of the reservoir, in turn, after scaling down, may correspond to the standard volume or to a larger volume than the standard volume.

Furthermore, the device 10 an outlet 14 on, by means of which the fluid F from the reservoir 12 , in particular so that from the device 10 , is dispensable. The actuator device 20 is by means of a control device 30 via one of the control device 30 generated first control signal 51 controllable to the volume of the reservoir 12 to shrink so that that into the reservoir 12 introduced fluid F through the outlet 14 at least partially from the reservoir 12 and thus, in the present case, also from the device 10 , emerges and can be applied to a workpiece carrier.

For this purpose, the actuator device generates 20 in reducing the volume of the reservoir 12 a pressure wave in the fluid F in the reservoir 12 , Furthermore, the actuator device 20 by means of the control device 30 be controllable, after the escape of the fluid F from the reservoir 12 the changed volume of the reservoir 12 to enlarge so that a state before reducing the volume of the reservoir 12 is restored. Thus, the process of discharging the fluid F from the reservoir is 12 For example, for "printing" an object by means of a hardening fluid, repeatable.

2 shows a schematic block diagram of a device 110 for applying a fluid F to a workpiece carrier for producing a workpiece according to another embodiment of the present invention. The device 110 is a variant of the device 10 and has further features compared to this:
The actuator device 120 the device 110 has a membrane 22 which is preferably in or as an outer wall of the reservoir 12 is trained. The membrane 22 closes the actuator device 120 for the fluid F, that is, the fluid F can except the membrane 22 no part of the actuator device 120 touch or wet. By Bulging of the membrane 22 towards a heart 13 of the reservoir 12 is the volume of the reservoir 12 shrinkable. By bulging the membrane 22 in a direction, which from the inside 13 of the reservoir 12 pointing outward, is the volume of the reservoir 12 enlargeable.

The actuator device 120 also has a piston 24 on, by means of which the membrane 22 in the manner described for reducing, and optionally increasing, the volume of the reservoir 12 deformable, in particular auszubulbar. The piston 24 can with the membrane 22 be firmly connected or only loosely to the membrane 22 be applied. In particular, in the latter case, the actuator device 120 a piston guide 23 within which the piston 24 movable and on the membrane 22 towards or from the membrane 22 away is feasible.

The actuator device 120 also has a coil 27 on which in relation to the piston 24 is arranged and designed such that during energizing the coil 27 with a corresponding electromagnetic current in the piston 24 build up electromagnetic eddy currents through which the piston 24 and the coil 27 repel each other. The sink 27 is relative to the actuator device 120 and the reservoir 12 fixed while the piston 24 inside the piston guide 23 is mobile. The one from the coil 27 rejected piston is through the piston guide 23 so guided that of the coil 27 repelled pistons 24 the membrane 22 towards the interior 13 of the reservoir 12 dented as described above. Due to the short-term pressure increase within the reservoir 12 a drop is discharged from the device or discharged, as explained in more detail below.

The actuator device 120 can be used to power up the coil 27 have a current and / or voltage source or be connected to such a current and / or voltage source.

The membrane 22 can be used as an elastically deformable membrane 22 be formed, so that one of the membrane 22 inherent elastic restoring force a deformation of the membrane 22 through the piston 24 counteracts. Thus, the membrane 22 a provision of the piston 24 and thus an increase in the volume of the reservoir 12 For example, on the standard volume of the reservoir 12 , cause, so that an initial state before the above-described reduction of the volume of the reservoir 12 is restored.

The outlet device 114 the device 120 has a throttle 16 on which an outlet 15 includes, through which the fluid F from the reservoir 12 and thus from the device 110 herausgebbar and can be applied to the workpiece carrier. A cross-sectional area of the outlet 15 may be formed according to a desired droplet size of the dispensed fluid F. The throttle 16 is as part of a throttle plate 17 formed, which in the device 110 an outside of the reservoir 12 forms.

The device 110 also has a heater 32 on, by means of which the fluid F or a starting material of the fluid F can be brought to an operating temperature of the fluid F, in particular heated. For example, one of the heater 32 feedable granules or filaments by means of the heater 32 melted and / or heated to obtain a liquid fluid F, in particular having a sufficiently low viscosity for a desired use. The fluid F is by means of a conduit 34 from the heater 32 in the reservoir 12 recoverable. Alternatively, the heater of the device 110 also as one along the line 34 trained heating coil be formed. The administration 34 may have a screw conveyor.

3 shows a schematic exploded view of the device 110 , In addition to the in 2 shown features are in 3 furthermore an optional housing 42 and a cover plate 44 represented, between which a power electronics 40 as a control device 30 is housed. As in 3 implied, the coil can 27 , The piston 24 , the piston guide 23 , the membrane 22 , the reservoir 12 and / or the outlet 15 be formed rotationally symmetrical about a common rotational symmetry axis A. As a result, a uniformity of the fluid F in the reservoir 12 as well as at the output from the device 110 be improved.

4 shows a schematic block diagram of a device 210 for applying a fluid F to a workpiece carrier for producing a workpiece 240 according to another embodiment of the present invention as well as a system 300 for producing a workpiece according to yet another embodiment of the present invention. The device 210 is a variant of the device 110 and differs from this in that the throttle 216 by means of the control device 30 via one of the control device 30 generated second control signal 52 is controllable, a cross-sectional area of the outlet 15 to adjust a desired droplet size of the dispensed fluid F.

According to 4 is the system 300 as the device 210 shown comprehensively. The system 300 may alternatively instead of the device 210 also the device 10 , the device 110 , or any embodiment described or implied or further development of the device according to the invention comprise.

Next to the device 210 includes the system 300 a one-, two- or three-dimensionally movable workpiece carrier 240 , A movement of the workpiece carrier 240 can by means of an actuator 242 of the workpiece carrier 240 be effected. The actor 242 can by means of the control device 30 the device 210 by means of one of the control device 30 generated third data signal 53 be controllable, so that the workpiece to be generated by cooperation of the discharge of the fluid F through the device 210 with the movement of the workpiece carrier 240 is produced.

Alternatively, the actuator 242 of the workpiece carrier 240 by means of one of the device 210 be controlled separate system control device. The system controller may also be used to control the controller 30 the device 210 be educated. The system 300 can also be considered as a variant of the device according to the invention, in particular, the device 210 and the workpiece carrier 240 in a single device as a system 300 be integrated.

5 FIG. 12 is a schematic flowchart for explaining a method of applying a fluid F to a workpiece carrier for producing a workpiece according to an embodiment of the present invention. The method can preferably be carried out with a device according to the invention or a system according to the invention and / or adapted according to developments of the device or the system, and vice versa.

In a step S01, a fluid F becomes a reservoir 12 with an outlet 14 from which the fluid F can be dispensed introduced.

In a step S02 becomes a volume of the reservoir 12 reduced so that that into the reservoir 12 introduced fluid 12 over the outlet 14 ; 114 at least partially from the reservoir 12 output and applied to a workpiece carrier. In an optional step, the reduced volume of the reservoir 12 again increased, preferably to the size of the volume of the reservoir 12 before shrinking S02 of the volume of the reservoir 12 , The enlargement S02, and the optional reduction, is preferably done by deforming one, in or as an outer wall of the reservoir 12 trained, membrane 22 ,

More preferably, the contracting includes S02 and / or optionally increasing the volume of the reservoir 12 a moving a piston 24 for deforming the membrane 22 , Preferably, the movement of the piston comprises 24 an energizing a coil 27 such that the piston 24 through, due to the energizing of the coil 27 arising, electromagnetic forces, in particular caused by electromagnetic eddy currents electromagnetic forces from the coil 27 is repelled.

The introduction S01 of the fluid F into the reservoir 12 may be continuous or regular and / or in accordance with a control device 30 respectively.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

The described device according to the invention may be suitable or adaptable or used for all fusible or liquid materials. For the purpose of producing or "printing", in particular "3D printing" of workpieces are in particular materials that cure over time. A limiting factor for the choice of material may be a surface tension inherent in the respective material. If the surface tension is too small, it may be the case that sufficient drop formation does not occur. In addition, it may come from the device at a particularly low surface tension at an unwanted leakage, if the reservoir 12 is sealed only on the surface tension of the dispensed and applied fluid F.

The device according to the invention may comprise a passive closing element in order to prevent unwanted leakage and to contribute to the drop formation of the fluid F to be delivered.

Conceivable areas of application of the device according to the invention, of the system or of the method according to the invention also arise, for example, for molten metals, for example for printing three-dimensional strip conductors or in food processing, for example for "printing" chocolate for decoration purposes. When using the device or the system for producing a workpiece from or on a food, advantageously some or all elements of the device or the system may be made of stainless steel.

For introducing S01 of the fluid F into the reservoir 12 can, for example, a Auger be used, which is approximately between the heater 32 and the reservoir 12 in the pipe 34 is arranged. Alternatively, the heating device can also be arranged on, in or around the screw conveyor. The heater can also be part of the reservoir 12 so that the fluid F in the reservoir 12 can be heated to a predetermined temperature or durable at a predetermined temperature.

Depending on a surface tension inherent to the fluid F to be dispensed, the cross-sectional area of the outlet 15 are chosen so small that there is no unwanted escape of the fluid F from the reservoir 12 comes. Thus, for example, can be dispensed with an active closing element such as a nozzle needle.

The throttle 16 ; 216 can be done in different ways. It can be performed, for example, conical, centric, stepped, etc. and adapted to the respective requirements or operating conditions.

Further variations relate to the shape of the reservoir 12 and the shape of the piston 24 , These shapes can be optimized for reproducibility of droplet size, droplet frequency, and efficiency of the device of the present invention.

The relative movement of the outlet means to the workpiece carrier may be effected by solely moving the workpiece carrier, by solely moving the outlet means, or by moving both the outlet means and the workpiece carrier in combination. For example, the outlet device may be movable in two first dimensions, while the workpiece carrier is movable in a third dimension, which is perpendicular to the first two dimensions, or vice versa.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2012/156319 A1 [0003]

Claims (12)

Contraption ( 10 ; 110 ; 210 ) for applying a fluid (F) to a workpiece carrier ( 240 ) for producing a workpiece, comprising: a reservoir ( 12 ), in which the fluid (F) can be introduced; an outlet device ( 14 ; 114 ), by means of which the fluid (F) from the device ( 10 ; 110 ; 210 ) is dispensable; an actuator device ( 20 ; 120 ), by means of which a volume of the reservoir ( 12 ) for generating a pressure wave in the reservoir ( 12 ) is reducible introduced fluid (F); and a control device ( 30 ), by means of which the actuator device ( 20 ; 120 ) is controllable, the volume of the reservoir ( 12 ) in such a way that the in the reservoir ( 12 ) introduced fluid (F) due to the pressure wave generated via the outlet device ( 14 ; 114 ) at least partially from the device ( 10 ; 110 ; 210 ) and onto the workpiece carrier ( 240 ) is applied. Contraption ( 110 ; 210 ) according to claim 1, wherein the actuator device ( 120 ) one in or as an outer wall of the reservoir ( 12 ) formed membrane ( 22 ), which the actuator device ( 120 ) for the fluid (F) tightly and which for reducing the volume of the reservoir ( 12 ) is deformable. Contraption ( 110 ; 210 ) according to claim 2, wherein the actuator device ( 120 ) comprises: a piston ( 24 ), by means of which the membrane ( 22 ) for reducing the volume of the reservoir ( 12 ) is deformable. Contraption ( 110 ; 210 ) according to claim 3, wherein the actuator device ( 20 ; 120 ) one by means of the control device ( 30 ) controllable eddy current actuator ( 26 ) having; the eddy current actuator ( 26 ) a coil ( 27 ), which is energized such that, due to the energizing of the coil ( 27 ) generated electromagnetic eddy currents, the piston ( 24 ) for deforming the membrane ( 24 ) from the coil ( 27 ) is repelled. Contraption ( 110 ; 210 ) according to claim 3 or 4, wherein the membrane ( 22 ) an elastically deformable membrane ( 22 ), which is adapted to a deformation of the membrane ( 22 ) through the piston ( 24 ) to exert counteracting force. Device according to one of claims 3 to 5, wherein the actuator device comprises: a means of the control device ( 30 ) controllable magnetic actuator, by means of which the piston ( 24 ) for deforming the membrane ( 22 ) is movable. Contraption ( 210 ) according to one of claims 1 to 6, wherein the outlet device ( 114 ) a throttle ( 216 ), which by means of the control device ( 30 ) is controllable, a cross-sectional area of an outlet ( 15 ) from the reservoir ( 12 ) to reduce or enlarge. Method for applying a fluid (F) to a workpiece carrier ( 240 ) for producing a workpiece, comprising the steps of: introducing (S01) a fluid (F) into a reservoir ( 12 ) with an outlet device ( 14 ; 114 ) from which the fluid (F) can be dispensed; Shrinking (S02) a volume of the reservoir (S02) 12 ) such that in the reservoir ( 12 ) introduced fluid (F) a pressure wave is generated such that in the reservoir ( 12 ) introduced fluid ( 12 ) via the outlet device ( 14 ; 114 ) at least partially from the reservoir ( 12 ) and onto the workpiece carrier ( 240 ) is applied to produce the workpiece. Method according to claim 8, wherein reducing (S02) the volume of the reservoir (S02) 12 ) moving a piston ( 24 ) for deforming a membrane formed in or as an outer wall of the reservoir. Method according to claim 9, wherein the movement of the piston ( 24 ) energizing a coil ( 27 ) such that the piston ( 24 ), due to the energizing of the coil ( 27 ), electromagnetic forces from the coil ( 27 ) is repelled. Method according to claim 9 or 10, wherein the introduction (S01) of the fluid (F) into the reservoir ( 12 ) continuously or regularly and / or in accordance with a control device ( 30 ) he follows. System ( 300 ) for producing a workpiece comprising: a device ( 10 ; 110 ; 210 ) for dispensing a fluid according to any one of the preceding claims 1 to 6; and a workpiece carrier ( 240 ), on which the fluid (F) by means of the device ( 10 ; 110 ; 210 ) is applicable for producing the workpiece; the outlet device ( 114 ) of the device ( 10 ; 110 ; 210 ) and the workpiece carrier ( 240 ) are movable relative to each other.

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