DE102016009434A1 - Device for three-dimensional additive printing operations, in particular according to the method of Fused Layer Modeling / Manufacturing (FLM), with planar direct drive - Google Patents

Abstract

The invention relates to a device (1) for three-dimensional additive printing operations, in particular according to the method of fused layer modeling / manufacturing (FLM), with at least one print head (7) and a workpiece support (4), in which the at least one print head (7). is freely movable in a plane of motion and is driven and guided positionable by a planar direct drive (3, 11) and the workpiece support (4) adjustable with an adjusting device (5) relative to the movement plane (11) of the at least one print head (7) is.

Description

The invention relates to a device for three-dimensional additive printing operations, in particular according to the method of fused layer modeling / manufacturing (FLM) according to the preamble of claim 1.

The currently very dynamically developing so-called 3-D printing processes offer the possibility to produce workpieces in an additive way by means of different techniques and materials and thus allow completely new approaches and design options for the production of components, even in small batches. Here are very different techniques and materials are used to the workpiece from z. B. powdery or strand-like materials point, layer or build layer by layer. In this case, as a rule, a machining head moves along the workpiece contour to be produced and in the process influences the starting material in places such that it assumes the desired shape of the workpiece at this point and then retains it. The processing head has to process some complicated geometric patterns, which sometimes requires very time-consuming machining operations due to the motion kinematics of the 3-D printer. Therefore, the focus of 3-D printing is currently on the production of workpieces as individual pieces and small series, especially in the field of rapid prototyping. Also, in the case of 3-D printers, which is acceptable to the end user, the available working space of the 3-D printer and thus also the size of the components to be produced in this way are generally limited.

In the so-called FLM method (FLM - Fused Layer Modeling / Manufacturing, also referred to by a manufacturer as Fused Deposition Molding (FDM)), webs and layers of a pasty material (eg, melted polymers or other plastics) are applied in layers. The driven axes of the 3-D printer move the nozzle for dispensing the paste-like material along the freely selectable component geometry, so that after completion of the process, the almost post-processing-free component is available. The layer thickness of the applied material is usually in the range of one to a few tenths of a millimeter thickness. Due to the low requirements on the starting material, a wide variety of thermoplastics with different properties can be used. For example, elastic, biodegradable, fluorescent, conductive, soluble or tribologically improved materials can be used and already available. In addition to the freely selectable geometry, components with the highest functional integration can be produced fully automatically in one go using these materials. Another advantage that further differentiates the FLM process from other established methods of 3D printing, such as SLM (Selective Laser Melting), is the introduction of lightweight structures in closed bodies. Since no powder is included as in the SLM process, for example, mechanically loaded structures can be designed as hollow bodies with an internal lightweight structure (eg, biologically inspired honeycomb structure). The method is therefore ideal for lightweight applications or allows significant material savings in large-volume structures. Advantages are in particular the short preparation time, the extremely low acquisition and operating costs, the large material spectrum and the simple handling of the process. Disadvantages are, in particular, the required support structure (eg overhangs) and the lower surface quality in comparison to the SLM process.

Typically, portal-like 3-D printers are used in which the position of the print head relative to the workpiece carrier by means of two axes in the x and y directions can be changed. In addition, the distance between the print head and the workpiece carrier is changed by means of a z-axis so that the distance between the print head and the uppermost printed layer remains as constant as possible. The relative movement in x-, y- and z-direction can be done either by the workpiece carrier, by the printhead or in any combination thereof. A disadvantage is that, in particular for large workpieces (eg 1.5 m × 1.5 m base area), the print head has to be moved over long distances, resulting in long print times due to the limited accelerations and travel speeds.

However, the available FLM systems are not able to fully exploit the stated advantages of the actual manufacturing process. In particular, the production speed is too low for more economical use. This is also related to the fact that in addition to the actual printhead also always the drive and guide elements must be moved, which are coupled with this. This results, among other disadvantages unnecessarily high acceleration forces or limitations of the maximum achievable dynamics of the print head and geometric constraints.

• • Vergleichsweise schwere Konstruktion des 3D-Druckers, insbesondere bei großen Verfahrwegen. Dies basiert auf der Vergrößerung der Führungs-, Antriebs- sowie Tragelemente. Hieraus resultiert eine reduzierte Dynamik des Kopfes im Druckprozess.
• • Massive Kollisionsproblematik bei Verwendung mehrerer, simultan arbeitender Druckköpfe. Eine effektive Zusammenarbeit mehrerer Druckköpfe wird so erschwert bzw. muss ausgeschlossen werden.
• • Geringere Präzision durch große bewegte Massen. Durch das hohe Eigengewicht der Konstruktion (Steifigkeit) wird eine präzise Führung entlang der zu erzeugenden Kontur erschwert. Dies gilt insbesondere für hochdynamische Bewegungen, die für die Qualität des additiv gefertigten Bauteils entscheidend sind.

According to the prior art, the following disadvantages arise when using conventional axle concepts with respect to the FLM method:

• • Relatively heavy 3D printer design, especially for long travel distances. This is based on the enlargement of the guide, drive and support elements. This results in a reduced dynamics of the head in the printing process.
• • Massive collision problem when using multiple, simultaneous printheads. Effective collaboration of multiple printheads is so difficult or must be excluded.
• • Less precision due to large moving masses. Due to the high weight of the structure (rigidity), precise guidance along the contour to be generated is made more difficult. This is especially true for highly dynamic movements, which are crucial for the quality of the additive manufactured component.

The object of the invention is therefore to provide a device for three-dimensional additive printing operations comprising a 3D printer, in particular for the FLM method, which is able to eliminate the problems described and thus to improve the printing results and the 3D printing more economical do.

The solution of the object of the invention results from the characterizing features of claim 1 in conjunction with the features of the preamble. Further advantageous embodiments of the invention will become apparent from the dependent claims.

• • Bei Vergrößerung der möglichen Verfahrwege einer solchen Vorrichtung steigt die ohnehin geringe bewegte Masse des Druckkopfes bzw. des Läufers nur minimal an (z. B. infolge längerer Zuführungen). Es ändert sich lediglich die Größe des feststehenden Stators, während der Läufer eine konstante Größe besitzt.
• • Durch die geringe Masse sind die Druckköpfe auf den Läufern auch bei großen Verfahrwegen stets hochdynamisch bewegbar.
• • Geringe Kollisionsproblematik Da die Läufer üblicherweise nur durch eine Versorgungsleitung mit der Steuerung verbunden sind, ist die Störkontur wesentlich geringer als bei konventionellen Achsen. Der simultane Einsatz mehrerer Druckköpfe ist möglich.
• • Nahezu verschleiß- und wartungsfrei Insbesondere bei großen Bauteilen müssen Verfahrbewegungen über große Strecken absolviert werden, bei denen herkömmliche Achsen stark verschleißen. Bei Planarantrieben besteht dieser Nachteil nicht.

The invention relates to a device for three-dimensional additive printing operations, in particular according to the method of Fused Layer Modeling / Manufacturing (FLM), with at least one print head and a workpiece support. Such a generic device is further formed by the fact that the at least one print head in a plane of movement freely movable and positionable driven and guided by a planar direct drive and the distance between the workpiece support and the plane of movement of the at least one print head with an adjustment is adjustable. Such planar direct drives (also called planar motors) are a relatively new development in the field of linear drives and z. B. from the DE 103 29 931 A1 known. They are used for very precise positioning tasks (eg in wafer positioning), pick-and-place handling and micro assembly applications. Usually, they consist of a spatially fixed and planar stator plate with integrated magnetic flux areas, which defines the maximum working space, and z. B. a runner with bobbins, which represents the end effector and can be positioned anywhere in the stator. Characteristic here is that no external axes move the rotor, but this built by the integrated direct drives independently force for positioning movements. The only entrained element is usually a supply line for the transmission of material, energy and signal flows. The bearing of the rotor is usually carried out by an air bearing, while strong permanent magnets pull the rotor against the stator. Both air nozzles and magnets are integrated in the rotor, while the stator is a purely passive component. The control is carried out in open or closed loop with integrated displacement sensors. This version is almost exclusively found in productive use. According to the prior art, further embodiments are known which use balls instead of the air bearing. For manufacturing processes such as for cutting such planar direct drives are unsuitable, since this higher processing forces would arise on the rotor. For use for precise and highly dynamic positioning of printheads for additive manufacturing processes, however, this per se known drive concept is ideally suited and does not have the above-mentioned weak points of conventional drive systems:

• As the possible travel paths of such a device increase, the already small moving mass of the print head or of the runner increases only minimally (for example as a result of longer feeds). It only changes the size of the fixed stator, while the rotor has a constant size.
• • Due to their low mass, the print heads on the runners are always highly dynamic, even with long travel distances.
• • Low collision problem Since the runners are usually connected to the control only by a supply line, the interference contour is considerably smaller than with conventional axes. The simultaneous use of multiple print heads is possible.
• • Virtually free of wear and maintenance Especially with large components, traversing movements over long distances must be completed, where conventional axles wear out severely. In planar drives, this disadvantage does not exist.

The use of planar direct drives for the movement of the print head (s) is therefore a very advantageous possibility for realizing highly dynamic and still very accurate print head drives. The relative adjustment of the distance between two-dimensionally movable in the plane of movement of the stator runners of the print heads and the workpiece support can then z. B. scissor-like mechanisms, lifting elements or other known drives, so that to be processed between the printheads and each Surface of the additively produced workpiece can always set the correct distance.

Of particular advantage in terms of the printing process and the kinematics of the device, it is when the plane of movement of the at least one print head is arranged horizontally, preferably hanging over the workpiece support. By a horizontal and in particular hanging over the adjusting device arranged movement plane, which is formed by the stator of the planar direct drive, the or the print heads can deposit from above material on the underlying workpiece and thus successively produce the workpiece additively. In this case, the workpiece support will be arranged at the beginning of the production of the workpiece quite close to the plane of movement and with increasing formation of the workpiece layer by layer and successively further away from the plane of movement.

For this purpose, it is advantageous in another embodiment, when the at least one print head is magnetically attracted and held by an air cushion of the plane of movement separately movable on the plane of movement. For this purpose, permanent magnets are usually arranged in the runners of the print heads, which are strong enough to magnetically hold the weight of the rotor and any attachments, here the printing device of the print head, to the stator. As a result, the rotor and thus the printhead will not come off the stator and fall down even in case of power failure or power cut. If the runner of the print head is to be moved, then compressed air is forced between the stator and the runner from an external source, so that the runner is lifted off the stator and can easily be displaced on an air layer relative to the stator. Due to the functional principle of the planar direct drive, the movement of the rotor and thus of the print head can then be controlled and guided in a manner known per se. Of course, another type of decoupling of rotor and stator as by rolling bearings is conceivable.

In a first conceivable embodiment, the at least one print head can be supplied with materials and / or signals and / or energy from supply stations which are stationarily arranged on the device, via transportable supply lines. So can this z. B. via per se known mitschleppbare control systems supports energy-conducting cable, signal cable and strands of the printing material between the printhead and the stationary arranged on the device supply stations are in communication. Such entrainable guidance systems are likewise known per se and do not require any great modification in order to be able to be used for the area of application in the foreground here.

In another embodiment, however, it is also conceivable that the power supply of the at least one print head takes place continuously or in sections via non-contact inductive transmission techniques or touch-contact sliding contacts. So z. B. the printheads or at least in certain ranges of movement of the plane of motion inductively with corresponding mating mating contacts in functional connection and transfer energy without contact to the printhead, where this transmitted energy can be stored. This would also be touching on appropriate sliding contacts work, the z. B. are arranged in the edge region of the plane of movement and there can be targeted by the printheads targeted for charging. For this purpose, in a further embodiment, the one or more printheads on a carrying energy storage, preferably a rechargeable battery, a battery or the like., Have, which are charged for a short time and then can take over the power supply of the printhead for a definable period of time.

Furthermore, it is conceivable that the energy storage z. B. in the form of a battery cyclically in a supply station is interchangeable, a combination of sliding contacts and fast storage energy buffers (Super-Caps) is conceivable.

Furthermore, it is also conceivable that the at least one print head periodically moves to a supply station for printing materials which is stationarily arranged on the device and receives printing materials there. Instead of over a constantly changing distance to a stationary on the device arranged supply of printing material to lead the typically strand-like printing material and promote, a smaller supply to the print head z. B. wound up and processed directly from there. If this local supply of printing material at the print head ends, it can, in a further embodiment, fill up the entrained stock by starting up a supply station from time to time. This can be z. B. take place in that the local storage of the entrained stock of the processed printing material of a print head in solid or liquid form, preferably in the form of heatable and replaceable cartridges or the like. Receptacle takes place. So z. For example, such a preheated cartridge can be picked up at the stationary supply station and loaded onto the print head, whereby about pre-liquefied print material immediately after the replacement is available for dispensing and can be immediately printed again. In addition, affects a heated liquid particularly advantageous on the energy balance of the runner. As a possible storage medium, interchangeable cartridges are conceivable, for example, which contain the already molten and homogenized material. The energy consumption in the print head is limited in this case to the maintenance of the temperature and the squeezing of the printing material. In this way, long run times of the print heads can be realized between a change need for cyclic energy or material transfers.

In a further embodiment, it is conceivable that the signal transmission to the at least one printhead is wireless, preferably via WLAN, Bluetooth or the like. Nahübertragungstechnologien. As a result, conductors or the like which are to be carried along for the energy and the printing material can be dispensed with and the signal transmission can take place via such near-field transmission technologies. In the case of signal flow, sufficient wireless communication technologies are known that allow sufficiently fast and stable communication with the printhead.

It is particularly advantageous that, in the case of planar direct drives, a plurality of print heads or runners can simultaneously produce or process the workpiece at different locations. In this case, it is also possible, in particular, for the working spaces of a plurality of print heads to overlap, and for each print head to be specifically controlled with regard to its motion control.

This makes it possible in a further embodiment that is controlled by appropriate path planning of the movement of the printheads, the movements of the plurality of printheads collision-free each other, even in superimposed workspaces of the individual printheads. For this purpose, advantageously, a collision calculation of the movements of the individual print heads is carried out in advance, and the execution of the movements of the individual print heads is coordinated with one another. For this purpose, it is advantageous in another embodiment, when using mitschleppbaren control systems for each printhead for each of the parallel printheads mitschleppbaren control systems arranged collision with each other and are independently movable at least in parts of the working space of the printheads. Thus, the entraageable control systems of different printheads z. B. be arranged in different distance planes to the plane of movement of the stator. It is also conceivable to take into account the geometric shape of the towable guidance systems which each of the printhead moves relative to the plane of movement of the stator in a collision calculation, and thus both the collision of the print heads movable in one plane and the collision of their entrained guidance systems prevent.

Furthermore, it is conceivable that in the case of a plurality of print heads, individual or all print heads process different print material and / or print material in different dimensions. So it may be z. B. be useful for filling larger cavities of the workpiece with the printing material to use a larger strand cross-section of the printing material. So z. For example, a printhead will process such print material with a larger strand cross-section, whereas another printhead will use a smaller strand cross-section of the print material for more filigree printing work and be supplied with it.

It is advantageous, due to the easily scalable size of the stator, that the dimensions of the workpiece support and moving devices of the device make it possible to produce large-volume workpieces up to dimensions of 1.5 m × 1.5 m × 1.5 m or even larger.

• • Stark erhöhte Prozessgeschwindigkeit durch parallelen Materialauftrag mit einer Mehrzahl oder Vielzahl von Druckköpfen,
• • simultanes Drucken mehrerer unterschiedlicher Materialien („Multimaterial”) oder unterschiedlicher Konfektionierung gleicher Materialien,
• • einfacher Aufbau des Drucksystems,
• • ausgezeichnete Skalierbarkeit,
• • hohe Präzision und Dynamik,
• • bei sehr großen Druckräumen hohe Wirtschaftlichkeit,
• • nahezu verschleißfrei.

The device according to the invention thus offers the following advantages over the prior art:

• • greatly increased process speed through parallel material application with a plurality or plurality of printheads,
• Simultaneous printing of several different materials ("multimaterial") or different packaging of the same materials,
• • simple construction of the printing system,
• • excellent scalability,
• • high precision and dynamics,
• • high efficiency in the case of very large pressure chambers,
• • almost wear-free.

A particularly preferred embodiment of the device according to the invention is shown in the drawing.

Show it:

1 - A first schematic structure of the device according to the invention with a arranged above the workpiece support stator of a planar direct drive and below in a hanging arrangement two closely spaced runners, on each of which a print head for an additive printing process is arranged and movable, in the spatial view and a flat side view,

2 - A variant of the device according to 1 in which each of the printheads with different materials, in the spatial view and a flat side view,

3 - A variant of the device according to 1 in which, between the workpiece support and the workpiece, an additional freely rotatable and controlled turntable offers an additional possibility of movement for the workpiece, in the spatial view and a planar side view,

4 - A variant of the device according to 1 in a planar side view, where the signal flow to control the movement of the printheads is wireless via a transmitter.

In the 1 the present invention is based on a first schematically illustrated construction of the device according to the invention 1 with one above the workpiece support 4 arranged stator 11 as part of a planar direct drive and underneath in a hanging arrangement two closely spaced runners 3 described on each of which a printhead 7 is arranged and movable for an additive printing process. Such planar direct drive from stator 11 and runners 3 are known in principle and should therefore be described only insofar as is necessary for their application to the present invention.

The stator 11 consists of a flat plate with magnetic flux areas, not shown, which in the present invention particularly advantageous in the upper region of a frame 2 is fixed and with its active movement level for the runners 3 down towards a workpiece support 4 shows. The workpiece support 4 is in the simplest case, in turn, a flat plate, by means of not shown movement means, eg. As a Scherenhubkinematik or the like., Along the directions of movement 5 can be moved vertically up or down and serves to maintain a constant distance between the currently being processed level of here kannenartigen workpiece 6 and the printheads described in more detail 7 adjust.

The two printheads shown here 7 are each on a rotor plate 3 arranged the planar direct drive and are by means of the runners 3 embedded strong permanent magnet against the stator 11 pulled, leaving the runners 3 under the stator 11 are arranged hanging. In a basically known manner, a simple relative mobility between the stator 11 and runner plates 3 is produced by means not shown devices continuously air between the stator 11 and runner plates 3 pressed, causing the rotor plates 3 resting on a kind of air cushion and controlled by the electromagnetic interaction of the planar direct drive and can be easily moved.

On the here flat runners 3 is in each case a printhead shown only schematically 7 for an additive printing process, in particular a method of Fused Layer Modeling / Manufacturing (FLM), attached, which in a manner also known per se, here from an external supply and not further illustrated as a strand 10 fed printed material and heated via a nozzle 9 in the direction of the workpiece support 4 pushes out. This is in an enlarged detail in the 1b also indicated schematically. The one in the nozzle 9 doughy heated skein 10 is doing in a conventional manner on the workpiece support 4 or in further layers on previously deposited and solidified strands 10 deposited deeper layers and forms, with constant adjustment of the distance from the workpiece support 4 and nozzle 9 successively and layered the workpiece 6 ,

For generating the necessary trajectories for storing the printed material 10 in the form of strands for the successive production of the workpiece 6 Here is the very accurate, but highly dynamic mobility of the rotor plates 3 and the printheads arranged thereon 7 relative to the stator 11 in the mutually perpendicular directions of movement 8th , The moving masses of the printheads 7 are only small, moreover, there are hardly any machining forces from the interaction of the doughy, to be deposited strand 10 on the workpiece 6 on, so that of the planar direct drive 3 . 11 provided driving forces completely sufficient, the rotor plates 3 with the printheads 7 relative to the stator 11 to move. Due to the low moving masses, the movements of the planar direct drive 3 . 11 be executed with high dynamics, but nevertheless with high accuracy, resulting in lower processing times and thus increased efficiency.

On a stator 11 can have two, but also several rotor plates 3 be moved and guided independently, which makes it possible with more than one printhead 7 at the same time the workpiece 6 manufacture. It should be noted that possible collisions of the rotor plates 3 z. B. should be ruled out in advance by collision considerations, so that the trajectories of the rotor plates to be processed 3 and thus the printheads 7 even with an overlap of the work areas of the printheads 7 do not lead to collisions.

Furthermore, it is possible that the different simultaneously working printheads 7 each different materials, eg. B. printing different plastic materials can handle. This allows the workpiece 6 to be composed of different materials. Also, it is possible for two printheads 7 the same material, but process in different dimensions, eg. B. a printhead 7 a large print material cross section for more solid parts and another a smaller print material cross section for filigree parts of the workpiece 6 , This is about in the 2 shown in which a printhead 7 the body of a can-like workpiece 6 and the other printhead 7 at the same time and independently of this, prints the associated handle made of a different material.

In the 3 is a variant of the device 1 according to 1 shown in between the workpiece support 4 and the workpiece 6 an additional freely rotatable and controlled turntable 12 an additional rotational movement possibility 13 for the workpiece 6 offers. Through the turntable 12 can z. B. rotationally symmetric areas of the workpiece 6 , ie z. B. the circular upper area are easily made by completely or predominantly the workpiece 6 rotatory through the turntable 12 in the direction of rotation 13 be rotated and the printheads 7 Do not change their position or only slightly. On the one hand, this accelerates the production of such rotationally symmetrical regions of the workpiece 6 On the other hand, this can be advantageous in terms of printing technology. In others, z. B. non-rotationally symmetric areas of the workpiece 6 can the turntable 12 little or no use.

In the 4 is a variant of the device 1 according to 1 shown in which the signal flow to control the movement of the rotor plates 3 and thus the printheads 7 wirelessly via a transmitter 14 he follows. Such a transmitter 14 can z. B. by wireless technology, Bluetooth or other Nahbereichsübertragungstechniken signals to control the movement of the rotor plates 3 , but also to the function control of the printheads 7 on at the rotor plates 3 and / or the printheads 7 arranged receiver 15 transfer. This makes it superfluous to supply such signals by wire.

LIST OF REFERENCE NUMBERS

1

contraption

2

frame

3

runner

4

Workpiece support

5

Adjustment movement workpiece support

6

workpiece

7

printhead

8th

Movement directions Printhead

9

jet

10

media

11

stator

12

turntable

13

Rotational motion turntable

14

transmitter

15

receiver

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

• DE 10329931 A1 [0009]

Claims (22)

Contraption ( 1 ) for three-dimensional additive printing operations, in particular according to the method of Fused Layer Modeling / Manufacturing (FLM), with at least one print head ( 7 ) and a workpiece support ( 4 ), characterized in that the at least one print head ( 7 ) in a plane of motion freely movable and by a planar direct drive ( 3 . 11 ) is positionally driven and guided and the relative distance between the workpiece support ( 4 ) and the movement plane ( 11 ) of the at least one print head ( 7 ) with an adjusting device ( 5 ) is adjustable. Contraption ( 1 ) according to claim 1, characterized in that the or each printhead ( 7 ) as a runner ( 3 ) of a planar direct drive or on a runner ( 3 ) is arranged and a plate-like formed stator ( 11 ) of the planar direct drive, the plane of movement of the at least one print head ( 7 ). Contraption ( 1 ) according to one of claims 1 or 2, characterized in that the or each print head ( 7 ) a plate-like runner ( 3 ) has a planar direct drive as a receptacle for the actual printing device. Contraption ( 1 ) according to one of the preceding claims, characterized in that the movement plane ( 11 ) of the at least one print head ( 7 ) horizontally, preferably hanging over the workpiece support ( 4 ) is arranged. Contraption ( 1 ) according to claim 4, characterized in that the at least one print head ( 7 ) magnetically attracted and from an air cushion of the movement plane ( 11 ) separately movable at the movement plane ( 11 ) is held. Contraption ( 1 ) according to claim 5, characterized in that the at least one print head ( 7 ) overhead on the plane of motion ( 11 ) hanging in an easily movable manner above the workpiece support ( 4 ) is held movable. Contraption ( 1 ) according to one of the preceding claims, characterized in that the at least one print head ( 7 ) on entrained supply lines with materials ( 10 ) and / or signals and / or energy from stationary to the device ( 1 ) arranged supply stations supplied. Contraption ( 1 ) according to claim 7, characterized in that the entrainable supply lines via towable guidance systems supported with the stationary on the device ( 1 ) arranged supply stations are in communication. Contraption ( 1 ) according to one of the preceding claims, characterized in that the power supply of the at least one printhead ( 7 ) continuously via non-contact inductive transmission techniques or touch contact sliding contacts. Contraption ( 1 ) according to one of the preceding claims, characterized in that the at least one print head ( 7 ) periodically a fixed to the device ( 1 ) arranged supply station for materials ( 10 ) and / or energizes and absorbs materials and / or energy there. Contraption ( 1 ) according to claim 10, characterized in that the power supply of the at least one print head ( 7 ) via a carried energy storage, preferably a rechargeable battery, a battery or the like. Contraption ( 1 ) according to claim 11, characterized in that the energy store in the form of a rechargeable accumulator touching or non-contact at least during portions of the movement of the printhead ( 7 ) is rechargeable. Contraption ( 1 ) according to claim 11, characterized in that the energy store in the form of a battery is cyclically interchangeable in a supply station. Contraption ( 1 ) according to one of the preceding claims, characterized in that the at least one print head ( 7 ) a supply of the printing material to be processed ( 10 ) and refills the entrained stock by starting a supply station from time to time. Contraption ( 1 ) according to claim 14, characterized in that the storage of the entrained stock of the printing material to be processed ( 10 ) in solid or liquid form, preferably in the form of heatable and replaceable cartridges or the like. Receptacle takes place. Contraption ( 1 ) according to one of the preceding claims, characterized in that the signal transmission to the at least one print head ( 7 ) wireless, preferably via WLAN, Bluetooth or the like. Nahübertragungstechnologien ( 14 . 15 ) he follows. Contraption ( 1 ) according to one of the preceding claims, characterized in that a plurality of printheads ( 7 ) simultaneously at different locations the workpiece ( 6 ) or edited. Contraption ( 1 ) according to claim 17, characterized in that in the case of a plurality of print heads ( 7 ) single or all printheads ( 7 ) each different print material ( 10 ) and / or printing material ( 10 ) process in different dimensions. Contraption ( 1 ) according to one of claims 17 or 18, characterized in that the working spaces of the plurality of print heads ( 7 ) are arranged overlapping. Contraption ( 1 ) according to claim 17, characterized in that the movements of the plurality of printheads ( 7 ) are controlled collision-free to each other. Contraption ( 1 ) according to claim 20, characterized in that for each of the parallel printing heads ( 7 ) entrained guidance systems arranged collision-free with each other and independently at least in parts of the working space of the print heads ( 7 ) are movable. Contraption ( 1 ) according to one of the preceding claims, characterized in that the dimensions of workpiece support ( 4 ) and moving devices ( 11 . 3 ) of the device ( 1 ) a production of large-volume workpieces ( 6 ) up to dimensions of 1.5 m × 1.5 m × 1.5 m or larger allow.

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