Device for the production of three-dimensional screen-printed workpieces

Abstract

Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, with a printing screen (12) and with a squeegee device (14) for flooding the printing screen (12) with a printing mass and / or for pressing printing mass through the printing screen (12), wherein the squeegee device (14) has at least one squeegee tool (16) and a squeegee bearing (34) for bearing the squeegee tool (16), wherein the squeegee bearing (34) has an adjustment device (28) for aligning the squeegee tool (16) and the adjustment device (28) is designed for automatic alignment of the squeegee tool (16) by means of self-weight-based support of the squeegee tool (16) on a substrate.

Description

The present invention relates to a device for producing screen-printed workpieces, in particular three-dimensional screen-printed workpieces. Furthermore, the present invention relates to a squeegee device, particularly for such a device. In addition, the present invention relates to an adjustment device for a device for producing three-dimensional screen-printed workpieces. German utility model DE 20 2019 101 066 U1 discloses a device for moving a doctor blade. The device comprises a doctor blade carrier on which the blade is mounted. The doctor blade carrier is pivotally connected to a doctor blade offset plate of the device about a pivot axis. The pivot axis is perpendicular to the longitudinal direction and essentially parallel to the direction of movement of the doctor blade during a squeegeeing operation. When a force acts on the doctor blade, it travels from the blade, via the pivot axis, to the doctor blade offset plate, thereby aligning the doctor blade relative to a substrate upon contact with it. A force sensor is positioned between the squeegee and the squeegee offset plate, or on the pivot axis, to measure the tensile and compressive forces, and thus the contact force of the squeegee on the screen printing mesh. The force sensor detects the force acting on the squeegee and therefore also on the pivot axis. However, the information obtained in this way has limited significance. Despite such force measurement, insufficient printing results or damage to the printing screen and / or the respective screen printing workpieces and / or the squeegee itself can occur during printing processes or squeegee movements. Unfavorable squeegee movements or repeated unfavorable contact of the printing screen by the squeegee can also lead to high wear of the respective device components, especially the printing screen.Despite the pivot axis between the squeegee carrier and the squeegee offset plate, an unfavorable alignment of the squeegee or an unfavorable contact of the printing screen by the squeegee can therefore occur. Furthermore, an unfavorable alignment of the squeegee relative to a screen printing workpiece or a workpiece carrier and / or relative to a printing screen can lead to an uneven layer build-up and / or to the formation of uneven and / or non-parallel layers. Against the background set out above, the object of the present invention was to provide a device for the production of three-dimensional screen-printed workpieces which ensures increased print quality with high operational reliability and at the same time guarantees improved monitoring and adjustability of printing and / or squeegee processes. With regard to the device, this problem has been solved by the subject matter of claim 1. Likewise, this problem has been solved by the subject matter of claims 114, 119, and 120. A doctor blade device according to the invention is specified in claims 121, 122, and 123. An adjustment device according to the invention is specified in claim 126. Advantageous embodiments are the subject of the dependent claims and are explained below. According to the invention, a device for producing three-dimensional screen-printed workpieces is provided. Such a device can, for example, be a 3D screen printing system, preferably an automated 3D screen printing system. The device according to the invention is equipped with a pressure screen and a doctor blade device for flooding the pressure screen with a printing compound and / or for pressing printing compound through the pressure screen. The doctor blade device comprises at least one doctor blade tool and a doctor blade bearing for supporting the doctor blade tool. The doctor blade bearing includes an adjustment device for aligning the doctor blade tool. The adjustment device is designed for automatic alignment of the doctor blade tool by means of its own weight-based support on a substrate. The adjustment device allows the doctor blade to be aligned relative to a substrate. This alignment simultaneously allows for the adjustment of the force distribution with which the doctor blade acts on the printing screen or printing table, for example, along its contact line or along its longitudinal extent. Thus, an adjustment device according to the invention enables a uniform or adapted force distribution acting on the printing screen and / or the respective printing substrate. Any potentially unfavorable centering of the squeegee tool can be prevented by adjustment. In particular, alignment ensures the application of uniform, parallel layers. This guarantees the production of high-precision screen-printed parts and significantly improves the quality of the prints. Furthermore, the alignment can be performed automatically and / or fully automatically, in particular without any manual steps after initiating an alignment process. The alignment of the squeegee tool can be achieved by resting it on a substrate based on its own weight. This makes it possible to align the doctor blade tool – regardless of the substrate – independently of other components and / or active positioning devices, such as motors and / or actuators, in a simple, quick, and automatic manner. This allows for particularly fast, safe, and precise alignment of the doctor blade tool with minimal handling effort. Inaccuracies caused by drives can also be avoided by using a weight-based support on a substrate. The self-regulating nature of the weight-based support allows for particularly precise adjustment without measurements or measurement-based adjustment processes. The term "deadweight-based" or "deadweight-based support" can, in this context, refer in particular to the deadweight of the doctor blade tool and / or the deadweight of the doctor blade tool, or of the doctor blade tool and the components or assemblies rigidly or immovably connected to the doctor blade tool. This could, for example, refer to the deadweight of the doctor blade tool and a support structure rigidly connected to the doctor blade tool – as will be described in more detail below. Alignment by weight-based support on a substrate can further be understood as follows: the actuating forces applied to the doctor blade for alignment are generated at least partially, and / or only partially, and / or exclusively, and / or maximally by the respective weight of the doctor blade or of the components or assemblies rigidly or immovably connected to the doctor blade. The adjustment device can therefore be designed for the automatic alignment of the doctor blade at least partially, and / or exclusively, and / or maximally by weight-based support of the doctor blade on a substrate. Similarly, when aligning by weight-based support on a substrate, in addition to the respective weight of the doctor blade tool and the components or assemblies rigidly or immovably connected to the tool, the positioning forces applied to the tool for alignment are superimposed by spring forces, particularly spring forces that counteract the respective weight and / or act in the direction of the weight force. The adjustment device can therefore be designed for the automatic alignment of the doctor blade tool by weight-based support on a substrate, superimposed with spring forces, particularly spring forces that counteract the respective weight and / or act in the direction of the weight force. Alignment by self-weight-based support on a substrate can further be understood as meaning that the actuating forces applied to the doctor blade for alignment are generated free from spring forces acting on the doctor blade. The adjustment device can therefore be designed for the automatic alignment of the doctor blade by means of self-weight-based support of the doctor blade on a substrate, free from spring forces acting on the doctor blade. In the present context, three-dimensional screen printing can be understood, in a particularly preferred manner, as an additive manufacturing process in which a powder-based suspension is transferred by means of a squeegee through a solid printing mask or screen onto a substrate, such as a printing table, a workpiece carrier, or a previously applied layer of a screen-printed workpiece, and then dried. This process can be repeated several times until the desired component height or shape is achieved. In particular, at least two or at least three printed layers can be created on top of each other in three-dimensional screen printing. In a final process step, the component thus produced can be sintered. This results in a screen-printed workpiece. Similarly, three-dimensional screen printing can, in a particularly preferred manner, be understood as an additive manufacturing process in which a powder-based suspension is transferred to a substrate through a solid printing mask or screen using a squeegee and then dried, whereby the desired component height or shape is achieved with a single print. In a final process step, a component produced in this way can be sintered to create a screen-printed part. Where multiple printing processes are mentioned, a single printing process may be sufficient and suitable instead. In the present context, a screen-printed workpiece can preferably be understood as a workpiece or a three-dimensional printed product that is to be subjected to, or has been subjected to, a sintering process. This applies in particular to screen-printed workpieces made of a metal, a ceramic, a glass material, and / or a plastic material. Alloys of steel, nickel, copper, titanium, and / or ceramic alloys are especially suitable for this purpose. Printed products made of plastic materials can be either excluded or included by the term "three-dimensional screen-printed workpiece". In particular, it is also possible to subject printed workpiece layers made of plastic material to a sintering step. In this context, a screen-printed workpiece can also be understood to be a workpiece or a three-dimensional printed product that has been manufactured without a sintering step, or can be manufactured or is manufactured without a sintering step. Thus, the final curing of printed layers can also occur without sintering steps. The curing of a screen-printed workpiece can advantageously also be achieved by UV curing and / or by a polymerization reaction and / or by drying, in particular by convection drying. Such curing is particularly preferable when the final curing of printed layers is to be carried out without sintering steps. In this context, the term "screen printing workpiece" can additionally or alternatively be understood to mean a workpiece or a three-dimensional printed product that has been produced entirely by three-dimensional screen printing. In this context, a screen-printed workpiece can also be understood as a workpiece or a three-dimensional printed product that has been produced, at least partially or in sections, by three-dimensional screen printing. Thus, a screen-printed workpiece can be produced by applying at least one printed layer or even multiple printed layers to a substrate provided by other means, with the substrate forming part of the finished workpiece. A screen-printed workpiece according to the present invention can furthermore be a pharmaceutical product and / or a biological product and / or an optoelectronic product. Such screen-printed workpieces can be made, among other things, from pharmaceutical powder materials and / or powder mixtures and / or granules and / or from biological materials and / or semi-metals. In particular, pharmaceutical products and / or biological products can be finished without sintering steps or sufficiently cured for the respective application. Screen-printed workpieces made from pharmaceutical powder materials and / or powder mixtures and / or granules may contain drugs, active ingredients, excipients, in particular fillers and / or binders and / or disintegrants and / or lubricants. According to a preferred embodiment of the present invention, the device for producing three-dimensional screen-printed workpieces can be designed and / or configured for production under cleanroom conditions. In particular, the device can be designed and / or configured for production under cleanroom conditions according to cleanroom classes A, B, C and / or D according to EU-GMP. A device according to the invention may preferably be designed and / or equipped for the production of three-dimensional screen-printed workpieces for use in medical technology, optics and / or laser technology, aerospace engineering, semiconductor technology, biotechnology and / or medical and / or pharmacological and / or optoelectronic research. Likewise, the device according to the invention can be designed and / or configured for the production of three-dimensional screen-printed workpieces for use and / or application as medical and / or pharmaceutical and / or optoelectronic products, implants and / or sterile products and / or medicines and / or for use and / or application as tablets for administering active ingredients. According to the present invention, a screen-printed workpiece can be a workpiece that is built up on a workpiece carrier by three-dimensional screen printing in one or more printing processes. In particular, the screen-printed workpiece is a workpiece that, after completion of the printing process and / or after completion of a subsequent sintering process, can be removed from the respective workpiece carrier, especially without damage. Between printing processes for a screen-printed workpiece, the workpiece carrier can be detached from the printing table or printing tabletop. The individual layers of a screen-printed workpiece – in the case of a multi-layered structure – can be dried between two successive printing processes in a position away from the printing table or printing tabletop. According to a preferred embodiment, the device for producing three-dimensional screen-printed workpieces can include a printing unit comprising at least the printing screen and / or the squeegee for the layer-by-layer production of at least one screen-printed workpiece in several screen-printing operations. Additionally or alternatively, the device for producing three-dimensional screen-printed workpieces can include a printing unit comprising at least the printing screen and / or the squeegee for the layer application onto a workpiece in at least one screen-printing operation. Thus, a screen-printed workpiece can be produced using the printing unit in a particularly reliable manner and with high productivity. Such a screen-printed workpiece could, for example, be a component from the automotive industry or personalized medications in the form of tablets. The printing device can include at least one printing table for positioning a workpiece carrier and / or a workpiece below the printing screen and / or below the doctor blade device. This advantageously ensures secure and stable positioning of the respective workpiece carrier and / or the respective workpiece, thus enabling a safe and precise printing process. Preferably, the adjustment device can be designed to automatically align the doctor blade tool with respect to at least two lines of freedom. This advantageously ensures a particularly reliable and precise alignment of the doctor blade tool to guarantee uniformly applied layers. According to a preferred embodiment, the adjustment device includes an air bearing assembly that allows for alignment of the doctor blade tool in air bearing operation. In particular, the air bearing assembly enables automatic alignment and / or alignment by means of the doctor blade tool's own weight resting on a surface with minimal effort. Due to its low-friction and / or frictionless adjustability, the air bearing assembly allows for very precise positioning and / or alignment of the doctor blade tool with exceptionally low force and wear. The adjustment device preferably incorporates an air bearing assembly that allows for tilt adjustment of the doctor blade tool around an axis of inclination during air bearing operation. As a result, the adjustment device can align or tilt the lower edge of the doctor blade along its longitudinal axis relative to the printing screen and / or a printing table and / or a horizontal plane, thereby enabling targeted influence on the resulting process parameters. In particular, a uniform or uneven force distribution between the lower edge of the doctor blade and the printing screen and / or the respective printing substrates along the longitudinal axis of the tool can be achieved. Consequently, the quality of the screen prints to be produced can be improved with significantly increased reliability.This also allows for targeted adjustments or settings of the squeegee device with regard to the respective wear of the printing screen. Furthermore, the adjustment device and / or the air bearing device can be designed to adjust the inclination of a tool longitudinal axis running along the longitudinal extent of the doctor blade relative to the printing screen and / or relative to a printing table and / or relative to a horizontal plane. This allows the doctor blade to be optimally adjusted for subsequent doctor blade processes and ensures a uniform force distribution between the respective lower edge of the doctor blade and the printing screen and / or the respective printing substrates. Furthermore, the adjustment device and / or the air bearing device can be designed to adjust the inclination of the squeegee's lower edge relative to the printing screen and / or a printing table and / or a horizontal plane. As a result, the air bearing device can align or tilt the squeegee's lower edge along its longitudinal extent relative to the printing screen and / or a printing table and / or a horizontal plane, thereby allowing targeted influence on the resulting process parameters. In particular, a uniform force distribution between the squeegee's lower edge and the printing screen and / or the respective printing substrates along the tool's longitudinal axis can be achieved. Consequently, the quality of the screen prints to be produced can be improved with significantly increased reliability.This also allows for targeted adjustments or settings of the squeegee device with regard to the respective wear of the printing screen. Furthermore, the adjustment device and / or the air bearing device for adjusting the inclination of the doctor blade tool can be designed around an axis of inclination. This axis of inclination can extend along a direction of doctor blade movement and / or at an angle, particularly perpendicular, to a vertical plane passing through the lower edge of the doctor blade. This design advantageously allows for ensuring a constant force between the doctor blade tool and a printing screen or the respective printing substrate along the entire length of the tool, or—depending on the desired process—for generating unequal forces or forces that increase or decrease constantly along the length of the tool. Wear-related inaccuracies or deviations in screen tension along the printing layout can thus be specifically compensated for. Furthermore, the air bearing assembly can have at least one air nozzle or several air nozzles to create a frictionless air bearing for the doctor blade during air bearing operation. This allows the doctor blade to be aligned with exceptional precision and minimal wear. Due to the integrated air bearing, precise alignment of the doctor blade is possible with very low forces and / or little to no static friction, thereby reducing handling effort and / or wear on the respective components while simultaneously achieving high adjustment precision. Furthermore, the air bearing assembly in a friction bearing operation allows for a force-fit fixing of the doctor blade relative to the axis of inclination. The doctor blade can thus be reliably fixed in an aligned position. In this context, "fixed" or "fixed" can be understood as holding the doctor blade in a position, particularly relative to it. The doctor blade is then fixed, especially relative to the axis of inclination, and therefore cannot be adjusted around this axis. Furthermore, the doctor blade device can have an adjustment bracket and a support structure coupled to and / or connectable with the adjustment bracket. The relative position of the support structure to the adjustment bracket and / or the relative alignment between the adjustment bracket and the support structure can be changed by means of the air bearing device. The doctor blade tool can be arranged on or attached to the support structure. Thus, the adjustment device can enable the adjustment of the relative position and / or the relative alignment between the adjustment bracket and the support structure. The adjustment bracket may in particular be a squeegee holder, especially a squeegee holder for receiving the squeegee device or a support structure of the squeegee device. According to a further preferred embodiment, the doctor blade bearing can be designed without pendulum bearings and / or axle bearings. Consequently, the doctor blade tool can be mounted without pendulum bearings and / or axle bearings. This results in particularly free movement of the doctor blade tool, especially in air bearing operation and / or when the tool is in an unfixed position. In this way, particularly precise alignment can be achieved with only minor or no geometric restrictions on the alignment movement. Specifically, the doctor blade tool can be mounted on the adjustment bracket via the support structure without pendulum bearings and / or axle bearings. The doctor blade bearing formed between the adjustment bracket and the support structure can therefore be designed without pendulum bearings and / or axle bearings. Furthermore, the doctor blade bearing can be located between the adjustment bracket and the support structure. Thus, the adjustment bracket can be arranged on or coupled to the support structure via the doctor blade bearing. Alternatively or additionally, an air bearing assembly can be located between the adjustment bracket and the support structure. This air bearing assembly can form an air bearing between the adjustment bracket and the support structure, enabling simple and wear-free alignment of the doctor blade tool. This allows the doctor blade tool to be aligned through relative movement between the adjustment bracket and the support structure. Preferably, the air bearing assembly and / or the at least one air nozzle of the air bearing assembly is arranged on the adjustment bracket. Alternatively or additionally, the air bearing assembly and / or the at least one air nozzle of the air bearing assembly is in operative contact with the support structure and / or can be brought into operative contact with the support structure. Alternatively or additionally, the air bearing assembly can allow relative movement between the adjustment bracket and the support structure, particularly in air bearing operation. In this way, frictionless and low-wear movement between the adjustment bracket and the support structure can be ensured for aligning the doctor blade. According to a preferred embodiment, the doctor blade device and / or the doctor blade bearing and / or the adjustment device and / or the air bearing device may have a permanent magnet or a plurality of permanent magnets for magnetically holding the doctor blade tool and / or the support structure. In this context, the term "holding" can be understood as absorbing a portion of the weight of the doctor blade, while simultaneously ensuring adjustability of the doctor blade. "Holding" can also or alternatively be understood as applying an attractive force that counteracts a repulsive force generated by the air bearing during air bearing operation. The at least one permanent magnet can thus be designed to absorb at least part of the weight of the doctor blade, thereby enabling or ensuring adjustability, in particular alignment, of the doctor blade. Additionally or alternatively, a permanent magnet can be used to prevent the bearing partners from becoming too far apart or the air bearing gap from increasing too much during air bearing operation. The at least one permanent magnet preferably generates a preload of the support structure against the adjustment bracket and / or against the air bearing assembly arranged on the adjustment bracket, or a magnetic force between the support structure and the adjustment bracket and / or between the support structure and the air bearing assembly arranged on the adjustment bracket, particularly along a squeegee movement direction. By means of the preload or magnetic force, uncontrolled and / or unwanted relative movement between the support structure and the adjustment bracket can be reliably prevented. In particular, the preload or magnetic force of the at least one permanent magnet can prevent the support structure from unintentionally detaching from the adjustment bracket, thereby increasing operational reliability. Specifically, unwanted tipping of the support structure can be reliably prevented in this way. Furthermore, the at least one permanent magnet can be configured with the air bearing device in an air bearing operation to create and / or maintain an air bearing between the support structure and the adjustment bracket. The permanent magnet can then provide the force to hold the support structure, while simultaneously ensuring relative adjustability between the support structure and the adjustment bracket with minimal force. Therefore, in air bearing operation, a permanent magnet can preferably ensure and / or facilitate the maintenance of an air bearing gap. In air bearing operation, the magnetic forces of the permanent magnet(s) can be in equilibrium with the air pressure in the air bearing gap or the air pressure acting on the projection surfaces of the air nozzles. According to a further preferred embodiment, the doctor blade device and / or the doctor blade bearing and / or the adjustment device can include at least one fixing device for fixing an adjusted inclination position of the doctor blade tool, in particular an inclination position of the doctor blade tool adjusted via the adjustment device and / or air bearing device. This allows the inclination position of the doctor blade tool, which can be preset or adjusted using the adjustment device, to be fixed in a simple and reliable manner. A finely adjusted inclination position for operating the device can thus be fixed, so that after adjustment, a change in the spatial position of the doctor blade tool or the doctor blade device can be effectively prevented, thereby ensuring high print quality between the layers. Preferably, the fixing device is designed for screwless and / or friction-fit fixing of the doctor blade tool in its aligned position. This allows for quick, reliable, and flexible fixing of the doctor blade tool. Furthermore, at least one fixing device can be designed to fix the relative position and / or relative alignment between the adjustment bracket and the support structure. Thus, relative movement between the adjustment bracket and the support structure can be prevented, for example, by means of the fixing device, particularly after the relative position of the support structure to the adjustment device has been adjusted. Furthermore, the fixing device can include an electromagnet or multiple electromagnets for magnetically fixing the doctor blade in a working position, particularly in a working position adjusted via the adjustment device and / or air bearing device. The electromagnet thus allows the doctor blade to be fixed, especially in a working position, in a particularly reliable manner and with minimal effort. Electromagnets enable particularly precise control and adjustment of the generated magnetic force with minimal operator effort. Furthermore, the at least one electromagnet and / or the at least one permanent magnet can be arranged on or associated with the adjustment bracket and / or the support structure. Preferably, the at least one electromagnet and / or the at least one permanent magnet is arranged on or associated with the adjustment bracket, and the support structure is ferromagnetic. The electromagnet and / or the at least one permanent magnet then advantageously interact with the ferromagnetic support structure in such a way that a force acts or can act between the electromagnet and / or the at least one permanent magnet and the support structure. Preferably, the at least one electromagnet is at least partially surrounded by an air nozzle. This reliably prevents relative displacement between the adjustment bracket and the support structure when the electromagnet is switched on and / or the air nozzle is switched off. Such a design also facilitates a space-saving design of the components, particularly the adjustment bracket. Additionally or alternatively, the fixing device can include at least one mechanical and / or pneumatic and / or hydraulic clamping device for fixing the doctor blade tool and / or the support structure in a working position, in particular in a working position of the doctor blade tool adjusted via the adjustment device and / or air bearing device. The clamping device can thus reliably fix the doctor blade tool in the working position with minimal design effort. Furthermore, the doctor blade device and / or the doctor blade bearing can have at least one slotted guide or slotted structure, wherein the slotted guide or slotted structure may preferably have clearance. This allows for the simple relative movement of two components that are movable relative to each other by means of the adjustment device or air bearing. Such a slotted guide or slotted structure with clearance enables a range of motion along several degrees of freedom and simultaneously achieves suitable limitation of any end positions. According to a further preferred embodiment, the doctor blade device can have a fastening system for attaching and / or holding the doctor blade tool. This fastening system can preferably be designed as a holding system and / or a quick-change holding system. The aforementioned systems facilitate the uncomplicated, simple, and / or quick changing of a doctor blade tool, as well as ensuring correct and secure holding of the doctor blade tool. Such a fastening system can also be designed for temporary fastening and / or holding for adjustment purposes. Furthermore, the fastening system can be operated without tools. Alternatively or additionally, the fastening system can have one or more retaining pins for holding or temporarily holding the doctor blade. The retaining pins can be designed specifically for hooking the doctor blade onto them and / or sliding it onto them. Additionally or alternatively, the fastening system can also be designed for releasing a doctor blade. Thus, the fastening system facilitates quick and easy changing of the doctor blade, requiring minimal handling effort. Alternatively or additionally, the fastening system can include the fixing device, thereby achieving a high level of functional integration. Preferably, the at least one retaining pin is guided in an elongated slot of the doctor blade bearing, particularly with some play. The doctor blade tool can then be held in a particularly simple manner by means of the retaining pin and the elongated slot. This allows for a particularly simple mechanical and / or geometrically defined connection to be produced. Furthermore, the adjustment bracket can have at least one retaining pin and / or the support structure at least one slotted guide. The support structure can then be mechanically held and / or hooked onto the adjustment bracket in a particularly simple manner, requiring minimal handling effort. Particularly preferred is the assignment of a slotted guide to each retaining pin, which enables a uniform and symmetrical force transmission. According to a further preferred embodiment, the doctor blade tool may have a blade and / or a blade of the doctor blade tool may be made, at least partially, of a plastic material and / or a sheet metal material. By designing the doctor blade tool as a blade and / or in combination with its construction from a plastic material and / or a sheet metal material, a high degree of operational reliability and functionality can be ensured. Such blades can, for example, be advantageously adjusted with regard to elasticity and exhibit high media resistance. Furthermore, these blades can be accommodated even in confined spaces and enable a particularly precisely defined force application to the respective printing screen. In a further preferred embodiment, the doctor blade tool may also have a doctor blade holder and / or the doctor blade may be mounted on a doctor blade holder of the doctor blade tool and / or clamped in or on a doctor blade holder. Thus, a doctor blade of the doctor blade tool can be arranged and / or fixed on or in the doctor blade holder with a high degree of safety. Furthermore, the doctor blade can have at least one side surface that extends between the blade's edges. The doctor blade holder can define and / or determine a doctor blade angle between the side surface and a horizontal plane, and / or between the side surface and the printing screen, and / or between the side surface and a printing table. Thus, the design of the doctor blade and / or the doctor blade holder allows the doctor blade angle to be optimized or selected to ensure that the printing mass is pressed through the printing screen as efficiently as possible, while simultaneously minimizing the risk of damaging the printing screen, for example, due to tilting. According to a further preferred embodiment, the doctor blade can be designed as an interchangeable tool. Additionally or alternatively, the doctor blade angle between a side surface and a horizontal plane and / or the printing screen and / or a printing table can be changed by replacing the doctor blade. By designing the doctor blade as an interchangeable tool, it can be easily and quickly replaced to accommodate different operating and process requirements. The device can therefore be quickly adapted to different operating and process requirements, and, for example, printing with different materials or using different printing screens and / or printing layouts can be accomplished with minimal effort.By changing the squeegee angle, it is possible to print different materials or achieve different printing results or print job thicknesses with one and the same device. Furthermore, the doctor blade tool can have an adjustment device for setting the doctor blade angle between a side surface of the blade and a horizontal plane and / or the printing screen and / or a printing table. The doctor blade angle can preferably be continuously or incrementally, particularly by means of predefined steps, using the adjustment device. The doctor blade angle can thus be optimized or selected in a particularly simple manner so that the respective printing mass can be pressed through the printing screen by the doctor blade in the best possible way, while simultaneously minimizing the risk of damaging the printing screen, for example, due to tilting. Moreover, such an adjustment device allows the doctor blade angle to be set without replacing any components. Furthermore, the doctor blade tool can have at least one coupling section formed on and / or connected to the doctor blade holder for connection to the doctor blade device via the doctor blade bearing, in particular the fixing device and / or the air bearing device. Thus, the coupling section allows the doctor blade tool to be securely connected to the doctor blade bearing. According to a further preferred embodiment, the doctor blade tool can have at least one retaining element formed on and / or connected to the doctor blade holder. The coupling section can be connected to the retaining element in at least two different positions, such that the doctor blade angle differs in these positions. The doctor blade angle can then be adapted to the specific application in a particularly simple manner. By changing the doctor blade angle, it is possible, for example, to print different materials or achieve different printing results or print thicknesses with one and the same doctor blade. According to a further preferred embodiment, the adjustment device can have at least one spring bearing which can be deflected elastically by an alignment movement of the doctor blade. The adjustment device can be designed for automatic alignment of the doctor blade by spring-assisted placement and / or spring-assisted pressing of the doctor blade onto a substrate. In this way, it is particularly advantageous that, when aligning the doctor blade tool, the actuating forces applied for alignment and acting on the doctor blade tool – in addition to the actuating forces generated by the respective self-weight of the doctor blade tool or the doctor blade tool and the components or assemblies rigidly or immovably connected to the doctor blade tool – can be at least partially generated by spring forces and / or superimposed with the actuating forces generated by the self-weight, in particular by spring forces that counteract the respective self-weight and / or act in the direction of the self-weight force.The adjustment device can thus be designed for the automatic alignment of the doctor blade by means of self-weight-based support of the doctor blade on a substrate when superimposed with spring forces, in particular with spring forces that counteract the respective self-weight and / or act in the direction of the self-weight force. According to a further preferred embodiment, the spring mounting can apply a spring preload acting on the doctor blade and / or be configured to apply a spring preload acting on the doctor blade, particularly in the case of automatic alignment of the doctor blade. Such a preload allows alignment movements of the doctor blade to be controlled in a particularly advantageous manner, and an assumed alignment position can be maintained stably until the doctor blade is fixed in place. According to a further preferred embodiment, the spring mounting can be configured to apply a spring force pressing the doctor blade tool onto the substrate and / or a spring force pushing the doctor blade tool away from the substrate when the tool is in contact with the substrate. A spring force pressing the doctor blade tool onto the substrate can particularly promote stable and secure contact of the tool and thus precise alignment. A spring force pushing the doctor blade tool away from the substrate can prevent excessive pressure on the tool and simultaneously enable a particularly well-controlled alignment movement of the doctor blade tool. According to a further preferred embodiment, the spring mounting can be configured to generate a spring force acting on the doctor blade in the direction of gravity and / or against the direction of gravity. A spring force acting in the direction of gravity can, for example, press the doctor blade against a surface, while a spring force acting against the direction of gravity can push the doctor blade away from the surface, thus counteracting the force of gravity. According to a further preferred embodiment, the doctor blade can be spring-loaded, particularly in an unfixed operating position, in a downward direction towards a substrate and / or in an upward direction away from a substrate, by means of the spring mounting. Spring force in the downward direction allows the doctor blade to be pressed particularly advantageously against a substrate. Spring force in the upward direction allows the doctor blade to be pushed particularly advantageously away from the substrate. According to a further preferred embodiment, the spring mounting can comprise at least one spring or a plurality of springs acting between the adjustment bracket and the support structure. Such a spring or several springs can advantageously generate a suitable spring force, for example, oriented in the downward direction and / or in the upward direction. With multiple springs, a stable mounting of the doctor blade device in the respective position can advantageously be maintained. According to a further preferred embodiment, the device can include a sensor for detecting the forces acting on the doctor blade. This allows suitable conclusions to be drawn about the doctor blade forces, and the respective process parameters and / or settings can be advantageously adjusted, corrected, and / or optimized. The sensor device can be designed to detect a deviation in the doctor blade force along a longitudinal extension of the doctor blade tool. This allows the measurement of the forces acting on the doctor blade along its longitudinal axis, as well as any differences in these forces along the longitudinal axis. This enables the uniformity or unevenness of the force exerted by the doctor blade on the printing screen to be incorporated into the process control during printing and doctor blade operations. Unevenness in the force can be counteracted either through process control or by adjusting the device settings, or it can be intentional or deliberately generated. Force measurement using such a sensor device thus enables a particularly advantageous process control, which allows for increased operational reliability while simultaneously improving or making the execution of printing or doctor blade movements more precise. Overall, this allows for a particularly advantageous and consistent contact of the squeegee with the screen printing mesh or printing screen. It also enables the implementation of process-related and / or wear-related, or even intentionally uneven, contact of the squeegee with the screen printing mesh or printing screen. For example, an initially uneven contact of the squeegee with the screen printing mesh can, during the execution of a printing or squeegee movement, generate uniform squeegee forces. Thus, an advantageous adaptation to the prevailing wear conditions can be achieved, and service life can be extended.Furthermore, a sensor device according to the invention can advantageously also reduce the wear of device components or slow down the progression of wear. By ensuring the squeegee is in correct and even contact with the screen printing fabric or screen, a uniform layer build-up of the screen-printed workpiece can be achieved. In particular, uniform layers of consistent thickness can be created parallel to each other. This improves the overall print quality. Finally, such a sensor system enables a relatively safe and monitorable spatial alignment of the doctor blade during printing or doctor blade operations. As a result, improved printing quality and improved process control during printing or doctor blade operations can be guaranteed. Furthermore, according to a further preferred embodiment, the sensor device may have at least one force sensor or at least two force sensors, in particular two force sensors connected in parallel. With this embodiment, it is possible to detect acting doctor blade forces and / or doctor blade force deviations along the longitudinal extent of the doctor blade tool with a high degree of reliability. Moreover, such an embodiment is cost-effective and can be implemented with only limited design effort. Furthermore, the force sensors can be arranged at intervals along the longitudinal axis of the doctor blade. This configuration allows forces to be measured at spaced-apart points on the doctor blade or at spaced-apart measuring points using the force sensors. This ensures that the force exerted by the doctor blade on the printing screen and / or on a printing table is, for example, uniform or – depending on the desired process – can be deliberately adjusted to be uneven. This design also facilitates the production of particularly precise layer thicknesses or a particularly precise layer application onto a screen-printed workpiece, workpiece carrier, or printing substrate. The respective layer thickness can be maintained with exceptional reproducibility and consistency over multiple printing processes using such a sensor device. In a further preferred embodiment, the force sensors can be configured for the simultaneous measurement of absolute doctor blade forces at measuring points spaced apart from one another along the longitudinal extent of the doctor blade tool. The simultaneous measurement of absolute doctor blade forces at spaced-apart measuring points allows for a direct comparison of the detected or measured doctor blade forces of the force sensors. This also enables the simultaneous processing of the acquired measurement data and thus the implementation of particularly safe and reliable control loops. Furthermore, the force sensors for detecting relative doctor blade force deviations can be configured at measuring points spaced along the longitudinal extent of the doctor blade tool. This design makes it possible, for example, during a printing process in which the doctor blade tool moves across a printing screen, to detect the doctor blade forces along a direction of movement of the doctor blade tool or during the movement of the doctor blade tool and to determine a relative doctor blade force deviation with minimal effort. Thus, for example, it is possible to influence printing parameters for subsequent printing processes and / or for a printing process that is still in progress.In particular, it can be ensured that the squeegee tool rests on the printing screen within desired parameters, or that the squeegee tool makes contact with the printing screen within predetermined and / or adjusted parameters. This allows for highly precise control of layer thicknesses per print layer and / or at different locations within a print layout. As a result, overall high print quality can be achieved. A sensor device can therefore advantageously detect absolute doctor blade forces and / or relative doctor blade force deviations. For example, absolute doctor blade forces can be detected after the doctor blade tool is placed on the printing screen or printing table. Conversely, relative doctor blade force deviations can be detected during movement of the doctor blade tool on the printing screen or printing table. Furthermore, in a top view of the doctor blade device, at least one force sensor or force sensors can be arranged above the contact line of the doctor blade tool. Additionally or alternatively, in a top view of the doctor blade device, at least one force sensor or force sensors can be aligned with the contact line of the doctor blade tool. The contact line is the line along which the doctor blade tool contacts the printing screen or printing table. This configuration thus minimizes the effects of moments that could distort or adversely affect force measurements taken by the sensor device on the printing screen or doctor blade tool. Furthermore, in a top view of the doctor blade device, at least one force sensor or force sensors can be arranged offset from the contact line of the doctor blade tool. This results in a more flexible system configuration and better utilization of the available installation space for the respective system components. According to a further preferred embodiment, the doctor blade device can have an adjusting device for moving the doctor blade tool between a raised starting position and at least one lowered operating position. Thus, with the aid of the adjusting device, the doctor blade device can be moved, for example, towards or away from a printing table and / or towards or away from a printing screen, particularly with minimal or no operating effort by the respective operator. Furthermore, the actuator can have at least one linear drive or multiple linear drives. Thus, the actuator is capable of performing linear movements with a high degree of safety and a relatively high level of automation. Furthermore, the actuator can have multiple linear actuators connected in series. This makes it possible to increase the stroke of the actuator or to use different linear actuators for different positioning functionalities. The at least one linear drive of the positioning device can be designed as an electric or electromechanical linear drive, an electric spindle drive, an electric cylinder, or a linear actuator. Such a linear drive reliably provides the required stroke and can be installed even in confined spaces. Furthermore, such linear drives can be advantageously combined. Furthermore, it can be provided that at least one linear drive of the positioning device is designed as a pneumatic linear drive or linear cylinder. Thus, the positioning device is capable of performing a linear movement using pressurized gas. Advantageously, such a pneumatic linear drive or linear cylinder can achieve a spring-loaded contact between the pressure screen and the respective squeegee, thereby reducing the risk of damage to device components. The pneumatic linear actuator can be positioned in the power flow between the electric or electromechanical linear actuator and the doctor blade. This allows the stroke of the positioning device to be quickly varied, increased, or decreased by actuating the pneumatic linear actuator. Furthermore, such an arrangement advantageously provides a spring-back action between the electric or electromechanical linear actuator and the doctor blade when the pneumatic linear actuator is actuated. Furthermore, the sensor device can be positioned in the force path between the actuator and the doctor blade. This allows the force acting on the doctor blade to be detected close to its point of origin. The sensor device also detects the force generated by the actuator. This enables precise measurement results that can be advantageously used for further or subsequent process control. Furthermore, the sensor device can be arranged in the force path between the actuator and the doctor blade bearing, and / or in the force path between the actuator and the adjustment device, and / or in the force path between the actuator and the adjustment bracket. This design has the advantage that the sensor device detects the forces generated by the actuator when the doctor blade contacts a printing screen very close to the actuator itself. This allows for particularly precise measurement results. Furthermore, the sensor assembly, in particular the force sensors of the sensor assembly, can be rigidly arranged between the adjustment bracket and a sensor holder connected to the actuating device. Such a configuration is particularly robust and exhibits low susceptibility to interference. The measurement results obtained from a sensor assembly arranged in this way therefore exhibit only low susceptibility to errors. According to a further preferred embodiment, the device for producing three-dimensional screen-printed workpieces can include a squeegee movement device for moving the squeegee device and / or the squeegee tool along a horizontal squeegee movement direction. This makes it possible to move a squeegee tool or the squeegee device along a horizontal squeegee movement direction. This allows, for example, a printing compound to be distributed by the squeegee device and / or the squeegee tool onto the printing screen and forced through it to build up the desired tool layer by layer. The squeegee movement device can include at least one linear drive for moving the squeegee device and / or the squeegee tool. Thus, the squeegee device and / or the squeegee tool can be moved linearly back and forth or forwards and backwards in one direction. Consequently, several successive printing passes with the device for producing three-dimensional screen-printed workpieces can be advantageously achieved. Likewise, this allows for flooding of the printing screen by a flood squeegee during a forward movement and printing by a print squeegee during a backward movement. According to a further preferred embodiment, the squeegee movement device can comprise a portal system with linear guides and / or a crossbeam and / or a support device for bracing the crossbeam on the linear guides. This makes it possible to move the squeegee tool or device suspended above a printing table and / or above a printing screen, for example, by linear movement. This ensures a reliable sequence of successive printing passes with the device for producing three-dimensional screen-printed workpieces. Such a portal system or portal axis system is particularly suitable with regard to the installation space requirements of a printing device.The printing screen and / or printing table can advantageously be positioned below the gantry system, and the resulting movement enables the printing of ink through the screen with high operational reliability. Such a gantry system also allows for the movement of a relatively heavy doctor blade system with high precision. In this configuration, the linear guides can run along the direction of the doctor blade's movement. This allows the gantry system, the doctor blade device, and / or the doctor blade tool to move along the same direction. Alternatively, or additionally, the crossbeam can run between the linear guides and / or perpendicular to them in a top view. This allows the crossbeam to connect the linear guides and move the doctor blade device together with them. This ensures high overall stability and, consequently, further improved movement precision. Furthermore, the doctor blade device and / or its adjusting mechanism can be attached to the crossbeam of the portal system. Thus, any movement of the crossbeam results in a movement of the doctor blade device or the doctor blade tool. The adjusting mechanism, in turn, enables relative movement of the doctor blade tool to the crossbeam of the portal system. According to a further preferred embodiment, the squeegee device can be arranged immovably along a longitudinal extension of the crossbeam. Such mobility is not necessary for the execution of squeegee movements, and immobility along a longitudinal extension of the crossbeam simplifies the overall design and can improve the stability and rigidity of the portal system. According to a further preferred embodiment, at least one linear drive of the doctor blade movement device can be coupled to the crossbeam of the portal system. Thus, a movement of the linear drive causes a movement of the crossbeam, which in turn, for example, also causes a movement of the doctor blade device or the doctor blade tool. Such a design can be implemented in a simple and robust manner. Furthermore, the device for producing three-dimensional screen-printed workpieces can have two doctor blade devices. One doctor blade device can be configured as a flood doctor blade device and the other as a printing doctor blade device. Additionally or alternatively, both doctor blade devices can be arranged on the doctor blade movement unit, in particular on the crossbeam of the doctor blade movement unit. Accordingly, a movement of the doctor blade movement unit causes a movement of the respective doctor blade device or tool. Thus, it can advantageously be ensured that both doctor blade devices are moved together by the doctor blade movement unit. According to a further preferred embodiment, the doctor blade device(s) and the doctor blade movement device can form a doctor blade system. Such a doctor blade system can be arranged as a complete assembly above a printing screen or a printing table and provide doctor blade movement with high precision. According to a further preferred embodiment, the doctor blade device for printing can be configured in a position mode. In this position mode, a pneumatic linear actuator of the positioning device can be retracted and / or an electric or electromechanical linear actuator of the positioning device can be at least partially extended or lowered. In other words, the pneumatic linear actuator can be deactivated, while the electric or electromechanical linear actuator is in operation. An electric or electromechanical linear actuator allows for very precise positioning of a specific position. By deactivating the pneumatic linear actuator, a spring-like return movement can be avoided or reduced, thus enabling the precise maintenance of a desired stroke position. According to a further preferred embodiment, the doctor blade device can be configured for pressure in a force mode. In force mode, a pneumatic linear actuator of the positioning device can be partially or fully extended and / or retracted. In force mode, it is thus possible to quickly and easily generate a large force and a large stroke using the pneumatic linear actuator. Simultaneously, in force mode, the spring-like behavior of the pneumatic linear actuator can contribute to maintaining a relatively precise desired doctor blade force. Abrupt changes in the doctor blade force can be avoided in such a force mode. According to a further preferred embodiment, in force mode, an electric or electromechanical linear drive of the actuator can be retracted or only partially extended or lowered. Thus, the electric or electromechanical linear drive can also be used to generate a stroke in force mode. Likewise, the electric or electromechanical linear drive can remain deactivated in force mode. According to a further preferred embodiment, in force mode the pneumatic linear drive of the actuating device can be operated as a gas spring. This is a simple and cost-effective design of the linear drive, and it ensures that a desired doctor blade force is precisely maintained even with fluctuating return movements of the doctor blade tool. According to a further preferred embodiment, the pneumatic linear actuator of the positioning device can incorporate a proportional valve for operation as a gas spring. A proportional valve can be an electromagnetic or medium-controlled valve capable of assuming any intermediate position between open and closed. Thus, the gas flow rate through the proportional valve can be regulated and / or controlled. This further improves the precise adjustability and maintenance of a desired doctor blade force. According to a particularly preferred embodiment, the device can include a pressure screen assembly. The pressure screen assembly can include a pressure screen movement device for moving the pressure screen between a raised test position and at least one lowered pressure position. The pressure screen can then be raised from a pressure position to a test position raised by a printing table or screen printing workpiece, particularly for carrying out test sequences. Advantageously, the pressure screen is height-adjustable for carrying out test sequences. The pressure screen movement device can have at least one linear drive or a plurality of linear drives for moving the pressure screen. Thus, the pressure screen can be moved linearly back and forth or up and down in one direction. Consequently, the pressure screen can be advantageously raised and lowered. Furthermore, the pressure screen movement device can have two linear drives spaced apart from each other along the longitudinal extent of the doctor blade. This design makes it possible to adjust the pressure screen independently at points spaced apart along the longitudinal extent of the doctor blade. In this way, tilting of the pressure screen transversely to the longitudinal extent of the doctor blade can be achieved. Preferably, the pressure screen movement device comprises a first linear drive and a second linear drive, wherein the linear drives are arranged on or assigned to opposite transverse sides of the pressure screen. Alternatively or additionally, the linear drives are spaced apart from each other along the longitudinal extent of the doctor blade and / or spaced apart from each other transversely, in particular perpendicularly, to the direction of doctor blade movement. The arrangement of the linear drives allows for quick and easy tilting of the pressure screen by means of a small stroke of the linear drives, thereby enabling particularly precise alignment of the pressure screen. Furthermore, the printing screen can be pivoted or tilted relative to the doctor blade tool and / or a printing table and / or a horizontal plane by means of the printing screen movement device. In this way, the printing screen can be advantageously aligned relative to the doctor blade tool and / or the printing table or a horizontal plane, and the functionality of the device can be further improved. The pressure screen can be pivoted or tilted about a pressure screen transverse axis extending perpendicular to the connecting line between the two linear drives by means of the pressure screen movement device. The pressure screen can then preferably be pivoted about the pressure screen transverse axis and transversely to it. In this way, the pressure screen can be adjusted with high precision and / or brought into a defined position. The pressure screen movement device may further, or additionally, include a third linear drive. The third linear drive may be arranged on or associated with a longitudinal side of the pressure screen. Alternatively or additionally, the third linear drive is spaced apart from the first and second linear drives in the direction of the doctor blade movement and / or transversely, in particular perpendicularly, to the longitudinal extent of the doctor blade tool. Such a linear drive allows the required stroke to be provided reliably and with minimal design effort, and can also be installed in confined spaces. In this way, the pressure screen can be adjusted independently at three different points using individual linear drives, enabling particularly flexible and precise alignment of the pressure screen. Preferably, the pressure screen is pivotable or tiltable about a pressure screen longitudinal axis extending transversely, in particular perpendicularly, to the pressure screen transverse axis and / or parallel to the longitudinal extent of the doctor blade tool by means of the pressure screen movement device. The pressure screen is then preferably pivotable about three axes by means of the pressure screen movement device. The printing screen can advantageously have three degrees of freedom or be adjustable in three degrees of freedom by means of the printing screen movement device. Thus, the printing screen can be adjustable vertically, particularly along the direction of gravity, and / or pivotable about its longitudinal and transverse axes. This allows the printing screen to be optimally aligned with the doctor blade and further improves printing precision and adjustment flexibility. According to a further preferred embodiment, the device for producing three-dimensional screen-printed workpieces can include a control unit for controlling and / or regulating the positioning device and / or the printing screen movement device and / or the adjustment device and / or the fixing device and / or the doctor blade movement device and / or the air bearing device and / or for processing and / or evaluating and / or storing and / or comparing sensor data from the sensor device and / or for executing a doctor blade and / or screen device routine. Thus, the control unit can advantageously control or regulate and / or process the aforementioned devices and their data. This ensures a high degree of productivity, repeatability, and operational reliability, and also generates a high density of information and data regarding the respective production processes. Where the text refers to a doctor blade and / or screen setup routine, this may additionally or alternatively refer to a doctor blade and / or screen correction routine. A doctor blade setup routine can therefore also be or include a doctor blade correction routine, and / or a screen setup routine can therefore also be or include a screen correction routine. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate a doctor blade force via the sensor device when force is applied by the doctor blade tool directly to a printing table and / or in a screen-free arrangement, particularly when the doctor blade tool is fixed. This eliminates the influence of the printing screen, especially its restoring forces, on the generation of the doctor blade force. Advantageously, this allows conclusions to be drawn about the elasticity of the doctor blade tool and / or the adjusting device and / or the entire doctor blade assembly, and the doctor blade forces thus determined can be taken into account for subsequent printing processes.In such an arrangement, the doctor blade force is largely determined by the elasticity of the doctor blade tool and / or the adjusting device and / or the entire doctor blade assembly, since the printing table regularly has a high stiffness or low compliance. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate a doctor blade force via the sensor device when force is applied to a printing screen in an operating position where the printing screen rests on a printing table and / or a fixed printing surface, particularly when the doctor blade is fixed. In particular, in such a position, the printing screen can rest completely and / or flat on the respective printing table and / or printing surface. In such a position, there is therefore already a planar contact between the printing screen and the printing table or printing surface, so that such contact does not first need to be created by a downward movement of the doctor blade. Therefore, when force is applied to the printing screen by the doctor blade, there is no or only negligible elastic deformation of the printing screen.This largely eliminates the influence of the printing screen, particularly restoring forces due to significant elastic deformation, on the generation of the doctor blade force. This, in turn, allows conclusions to be drawn about the elasticity of the doctor blade tool and / or the adjusting mechanism and / or the entire doctor blade assembly, and the doctor blade forces determined in this way can be taken into account for subsequent printing processes and / or measurements. At the same time, complete removal of the printing screen from the printing area can be avoided. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate a doctor blade force via the sensor device when force is applied to a printing screen, without any contact between the printing screen and a printing table and / or a printing base and / or at least one screen printing workpiece, particularly when the doctor blade is fixed. Under such force, the doctor blade force corresponds to a restoring force of the printing screen, which arises from elastic deformation of the printing screen. This allows conclusions to be drawn about the mechanical behavior of the printing screen, its condition, and the doctor blade forces in interaction between the doctor blade device and the printing screen.Therefore, conclusions can be drawn about the elasticity of the printing screen, and the squeegee forces determined in this way can be taken into account for subsequent printing processes and / or measurement processes. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate a squeegee force via the sensor device when force is applied by the squeegee tool to a printing screen and when contact is generated by the printing screen with a printing table and / or a printing support and / or at least one screen-printed workpiece, particularly in the case of elastic deformation of the printing screen. Thus, in such an operating position, a force can initially be applied by the squeegee tool to the printing screen, and this force can generate an elastic deformation of the printing screen, as a result of which the printing screen comes into contact with a printing table and / or a printing support and / or at least one screen-printed workpiece located below it.The squeegee force generated in this process is determined by the restoring force of the printing screen due to its elastic deformation, as well as by the restoring force of the printing table and / or a printing support and / or the at least one screen-printed workpiece. The squeegee forces resulting from the interaction between the squeegee device, the printing screen, the printing table or printing support, and / or the screen-printed workpieces produced below the printing screen can thus be determined. According to a further preferred embodiment, the control unit can be configured to detect and / or evaluate increases or decreases in doctor blade force via the sensor device during a lowering movement of the doctor blade tool initiated by the positioning device. Thus, the control unit can be able to detect and / or evaluate increases in doctor blade force using the sensor device. This advantageously allows the lowering movement to be influenced depending on the detected doctor blade forces and / or the doctor blade forces generated during the lowering movement to be recorded and / or stored for later evaluation. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate an increase in squeegee force via the sensor device during a lowering movement of the squeegee tool, which is carried out exclusively on the printing screen by means of the positioning device, and in particular without contact between the printing screen and a printing table and / or a printing surface and / or at least one screen printing workpiece. This allows the influence of the elastic deformation of the printing screen on the increase in squeegee force during a lowering movement of the squeegee tool to be detected in isolation. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate an increase in doctor blade force via the sensor device during a lowering movement of the doctor blade tool onto the printing screen by means of the positioning device, in an operating position with the printing screen resting on a printing table. This allows the influences of the elastic deformation of the doctor blade tool and / or the positioning device and / or the doctor blade assembly as a whole on the increase in doctor blade force during a lowering movement of the doctor blade tool to be detected in isolation. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate an increase in the doctor blade force via the sensor device during a lowering movement of the doctor blade tool onto a printing table and / or a printing support, particularly in a screen-free arrangement. This also allows the effects of elastic deformation of the doctor blade tool and / or the positioning device and / or the doctor blade assembly as a whole on the increase in doctor blade force during a lowering movement of the doctor blade tool to be detected in isolation. Furthermore, the control unit can be configured to terminate the lowering movement of the doctor blade tool by the positioning device when a change in blade force is detected by the sensor during the lowering process, or to terminate the lowering movement by the positioning device after a predetermined lowering stroke. Thus, the control unit can serve to terminate the lowering of the doctor blade tool when a specific or predetermined change in blade force is reached, or to terminate it after a predetermined lowering stroke. This protects both the doctor blade tool or the doctor blade assembly, as well as the printing screen and / or the printing table. According to a further preferred embodiment, the control device can be configured to automatically or semi-automatically reference a doctor blade height when a change in doctor blade force is detected by the sensor device and / or when an increase in doctor blade force begins during the lowering of the doctor blade tool is detected by the sensor device. This can mean that, based on an incipient change in doctor blade force or the incipient change in doctor blade force during the lowering of the doctor blade tool, the control device defines a specific doctor blade height, for example, a target height or target position of the doctor blade tool, as a reference, which in turn can serve as a reference for subsequent processes. This further improves the reproducibility of the respective processes. According to a further preferred embodiment, the control device can be configured to detect and / or evaluate deviations in the doctor blade force along the longitudinal axis of the doctor blade via the sensor device during a lowering movement of the doctor blade tool initiated by the positioning device. Accordingly, the control device can detect, compare, and / or evaluate doctor blade forces along the longitudinal axis of the doctor blade tool. This makes it possible, for example, to use the control device to ensure a uniform force distribution along the longitudinal axis of the doctor blade tool, so that the pressure or force of the doctor blade tool on the printing screen can be set and / or maintained at a constant level along the longitudinal axis of the doctor blade tool. Likewise, desired deviations in the doctor blade force along the longitudinal axis can be set and / or maintained. According to a further preferred embodiment, the control device can be configured to move the doctor blade assembly into a doctor blade change position, particularly during a doctor blade setup routine, by means of the positioning device. In this position, the doctor blade can be changed easily and quickly. The control device ensures reliable transfer of the doctor blade assembly into the doctor blade change position. This reduces the overall handling effort and the risk of operator error. Furthermore, the control unit can be configured, particularly during a doctor blade setup routine, to detect and / or recognize whether a doctor blade tool is attached to or connected to the doctor blade bearing and / or the doctor blade device, specifically via a doctor blade force detected by the sensor device and / or via the tool's own weight detected by the sensor device and / or via components and / or assemblies permanently connected to the doctor blade tool. With such a configuration, it is technically possible to automatically detect whether a doctor blade tool is attached to the doctor blade bearing or doctor blade device, thereby increasing overall operational reliability. Furthermore, the control device can be configured, particularly during a doctor blade setup routine, to activate or keep activated the air bearing or air bearing device, especially the at least one air nozzle, and to deactivate and / or keep inactive the at least one electromagnet. During a lowering movement, it can then advantageously be ensured that the air bearing or air bearing device is active and that precise alignment of the doctor blade, particularly automatically, can be achieved with minimal forces acting on the blade. Alignment of the blade can then be achieved with minimal handling effort and a low risk of operator error. According to a preferred embodiment, the control unit can be configured, particularly during a doctor blade setup routine, to terminate a lowering movement by the positioning device upon reaching a force reference value detected by the sensor device, and / or to continue a lowering movement by the positioning device for a predetermined lowering stroke, and / or to terminate it after a predetermined lowering stroke. The lowering movement can then advantageously be terminated when a force reference value detected by the sensor device is reached and / or exceeded. This allows the alignment of the doctor blade tool or the doctor blade to be carried out automatically and with minimal manual effort, and to be terminated at a suitable time after a sufficient lowering stroke has been completed. A force reference value can be a value corresponding to the weight of the doctor blade and / or the weight of components or assemblies rigidly attached to the doctor blade. Such a force reference value ensures that the doctor blade and / or the tool with its rigidly attached components rests fully on the surface with their respective weights, thus guaranteeing correct and complete alignment. The force reference value can be predefined, modifiable, and / or subject to tolerances. Alternatively, the force reference value can be a value of the respective weights multiplied by a factor. According to a further preferred embodiment, the control device can be configured, particularly during a doctor blade setup routine, to terminate a lowering movement by the positioning device and / or continue a lowering movement by the positioning device for a predetermined lowering stroke and / or terminate it after a predetermined lowering stroke, when a doctor blade force deviation detected by the sensor device is within a reference interval or reference value range along a longitudinal extension of the doctor blade tool. The lowering movement can then advantageously be terminated when a doctor blade force deviation detected by the sensor device within a reference interval or reference value range is reached and / or exceeded. The alignment of the doctor blade tool or the doctor blade can then be carried out automatically depending on a doctor blade force deviation and with minimal handling effort. According to a further preferred embodiment, the control device can be configured, particularly during a doctor blade setup routine, to activate and / or keep activated the at least one electromagnet and / or to deactivate and / or keep deactivated the air bearing or air bearing device, in particular the at least one air nozzle. Consequently, the control device can be configured to automatically fix the doctor blade or doctor blade tool in an aligned position. Because this fixing can be automatic or semi-automatic, human operating errors can at least be reduced, and any handling effort can also be minimized. According to a further preferred embodiment, the control device can be configured to reference the position of the doctor blade tool, particularly during a doctor blade setup routine, after completion of a lowering movement by the positioning device and / or activation of the at least one electromagnet and / or deactivation of the air bearing or air bearing device. Consequently, the control device can use such a referencing for subsequent printing or doctor blade operations. In particular, starting from a referenced alignment and / or inclination position, either no further adjustment effort or a reduced adjustment effort may be required, since the desired doctor blade force distribution is already present or can be achieved with minimal adjustment effort. According to a further preferred embodiment, the control device can be configured to change the position of the doctor blade relative to the referenced position by means of a lowering or raising movement, particularly during and / or for a doctor blade operation, in order to set a target doctor blade force during a doctor blade operation. This can mean that the control device can adjust the doctor blade or the doctor blade vertically relative to the referenced position to ensure a target doctor blade force during the subsequent doctor blade operation. A desired doctor blade force can then be reliably set with minimal effort. The control device can further be configured to move the doctor blade tool upwards, particularly during a doctor blade setup routine, after activation of the at least one electromagnet, by means of the positioning device, specifically to a screen correction position. The doctor blade tool can then be adjusted in an aligned position to a predetermined position, particularly a screen correction position. Because the upward movement can be automatic or semi-automatic, labor-intensive operation can be avoided and productivity increased. In a screen correction position of the doctor blade tool, screen correction or screen adjustment can be performed. Furthermore, the control device can be configured, particularly within the context of a screen setup routine, to generate an effective contact between the squeegee tool (which is in a screen correction position, aligned by its own weight, or aligned by spring-assisted placement and / or spring-assisted pressure on a substrate) and the printing screen (which is in a screen correction position), with the squeegee tool exerting a force on the printing screen. This contact is achieved, in particular, without the printing screen and / or the squeegee tool contacting a printing table, a printing substrate, or at least one screen printing workpiece. During this effective contact, the squeegee tool can press into or plunge into the printing screen and / or cause elastic deformation of the printing screen.The behavior during such an active contact, in particular free from contact between a printing table and / or a printing surface and / or at least one screen printing workpiece by the printing screen and / or by the squeegee tool, allows conclusions to be drawn in a particularly advantageous way about the suitability or accuracy of the screen position for subsequent printing processes. Furthermore, the control unit can be configured, particularly within the context of a screen setup routine, to detect and / or evaluate an increase in squeegee force via the sensor device when generating contact between the squeegee tool and the printing screen. Specifically, during the generation of such contact, the control unit and / or sensor device can detect and / or evaluate deviations in squeegee force along the longitudinal axis of the squeegee tool. The detected and / or evaluated data can advantageously be used to correct and / or adjust the screen position, thereby further improving print quality and precision. Furthermore, the control unit can be configured, particularly within the context of a screen setup routine, to detect and / or evaluate an increase in squeegee force via the sensor device during an upward movement of the printing screen by means of the printing screen movement device, exclusively on the squeegee tool, especially when it is in a screen correction position, and particularly without contact between the printing screen and a printing table and / or a printing substrate and / or at least one screen printing workpiece. This allows the influence of the printing screen on the increase in squeegee force during an upward movement of the printing screen to be detected. The influence of the printing screen can thus be advantageously taken into account during a printing process. Furthermore, the control device can be configured, particularly within the framework of a screen setup routine, to raise and / or position the printing screen in a screen correction position, in particular free from contact with a printing table and / or a printing surface and / or at least one screen printing workpiece by the printing screen, and during a downward movement of the squeegee tool, in particular aligned and / or self-weight-based aligned and / or aligned by spring-supported placement and / or spring-supported pressing of the squeegee tool onto a substrate, to detect and / or evaluate an increase in squeegee force via the sensor device, in particular to detect and / or evaluate an increase in squeegee force free from contact with a printing table and / or a printing surface and / or at least one screen printing workpiece by the printing screen and / or by the squeegee tool.This allows the influence of the printing screen on the increase in doctor blade force during the downward movement of the doctor blade tool to be effectively captured. The influence of the printing screen can thus be advantageously taken into account during the printing process. The downward movement of the doctor blade tool onto the printing screen can be carried out until effective contact with the printing screen is established and / or the doctor blade tool has reached a screen correction position. The screen correction position of the printing screen can, in particular, be raised further or be above a screen correction position of the doctor blade tool. Furthermore, the sieve correction position of the printing sieve can advantageously correspond to a predetermined bounce height. According to an advantageous embodiment, the control device can be configured, particularly within the context of a screen setup routine, to detect and / or evaluate a squeegee force deviation along a longitudinal dimension of the squeegee tool via the sensor device during an upward movement of the screen by means of the screen movement device, specifically on the squeegee tool when it is in a screen correction position. This is particularly important as it allows for the detection of a squeegee force deviation along a longitudinal dimension of the squeegee tool without contact between the screen and a printing table and / or a printing substrate and / or at least one screen printing workpiece. This enables the detection of the screen's influence on the squeegee force along a longitudinal dimension of the squeegee tool during an upward movement of the screen.The effects of the printing screen can thus be taken into account to a particularly advantageous extent in a subsequent printing process, and / or differences in the increase in force along the longitudinal extent of the doctor blade can be detected and taken into account. This allows for further improvement of the print quality. According to an advantageous embodiment, the control device can be configured, particularly within the framework of a screen setup routine, to raise and / or position the printing screen in a screen correction position, in particular free from contact with a printing table and / or a printing substrate and / or at least one screen printing workpiece by the printing screen, and during a downward movement of the squeegee tool, in particular aligned and / or self-weight-based aligned and / or aligned by spring-supported placement and / or spring-supported pressing of the squeegee tool onto a substrate, to detect and / or evaluate a squeegee force deviation along a longitudinal extent of the squeegee tool via the sensor device.In particular, a squeegee force deviation along a longitudinal extension of the squeegee tool is prevented from contacting a printing table and / or a printing substrate and / or at least one screen-printed workpiece through the printing screen and / or the squeegee tool. The downward movement of the squeegee tool can occur, in particular, after or simultaneously with the lifting of the printing screen. The downward movement of the squeegee tool can be directed onto the printing screen, which is positioned in the screen correction position. In this way, influences of the printing screen during a subsequent printing process can be taken into account in a particularly advantageous manner, and / or differences in force increase along a longitudinal extension of the squeegee tool can be detected and addressed. This can also further improve print quality. According to a preferred embodiment, the control device can be configured, particularly within the context of a screen setup routine, to move the printing screen upwards, especially without contact between the printing screen and a printing table and / or a printing substrate and / or at least one screen printing workpiece, against the doctor blade tool, which is particularly in the screen correction position, and / or to raise the printing screen higher than the doctor blade tool until a predetermined rebound height and / or a screen correction position of the printing screen and / or a minimum force exerted by the doctor blade tool on the printing screen is reached. This allows the doctor blade force acting on the printing screen to be detected and taken into account at a predetermined rebound height or screen correction position, particularly with high accuracy. The height of the screen between the printing screen and a printing table and / or a printing surface and / or at least one screen printing workpiece can be crucial in determining the degree to which the screen is depressed when a force is applied by the squeegee, particularly due to line contact. Knowing the screen's resetting force profiles, which can be previously determined and / or stored, allows for inferences about the screen's resetting force to be drawn from the height of the screen. An upward movement of the screen relative to the squeegee can provide information about the elastic deformation of the squeegee, the positioning mechanism, and / or the entire squeegee assembly. This allows for a more accurate determination of the printing force. According to a preferred embodiment, the control device can be configured, particularly within the context of a screen setup routine, to raise the printing screen in an upward movement, specifically without the printing screen contacting a printing table and / or a printing support and / or at least one screen printing workpiece, until a screen correction position and / or a predetermined rebound height is reached. Thus, in a screen correction position and / or at a predetermined rebound height of the printing screen, contact between the printing screen and a printing table and / or a printing support and / or at least one screen printing workpiece can be reliably avoided. Instead of an upward movement of the printing screen to exert force on the doctor blade tool, a downward movement of the doctor blade tool onto the printing screen can also take place, especially if the printing screen remains free from contact with a printing surface or a printing table. According to a preferred embodiment, the control device can be configured to move the doctor blade tool downwards, particularly within the context of a screen setup routine, towards the printing screen, which is in a screen correction position, in particular until a minimum force exerted by the doctor blade tool on the printing screen is reached and / or until the doctor blade tool is positioned in a screen correction position and / or until effective contact is established between the doctor blade tool and the printing screen. This allows the determination of forces between the doctor blade tool and the printing screen to be carried out with increased accuracy overall. According to a particularly preferred embodiment, the control device can be configured, especially within the framework of a screen setup routine, to tilt the printing screen about at least one axis, in particular by means of the printing screen movement device, pivoting and / or tilting it about a transverse axis and / or longitudinal axis of the printing screen, depending on data acquired and / or evaluated by the sensor device and / or acquired and / or evaluated increases and / or deviations in the doctor blade force along a longitudinal extent of the doctor blade tool. This enables particularly advantageous positioning and alignment or adjustment of the printing screen for high-quality printing processes. According to a particularly preferred embodiment, the control device can be configured to reference the position of the first and second linear drives of the printing screen movement device, particularly within the context of a screen setup routine, especially at a predetermined drop height. Consequently, the control device can use such referencing for subsequent printing or doctor blade operations and / or for further adjustments of the device. In particular, starting from the referenced positions of the linear drives, either no further adjustment effort or a reduced adjustment effort may be required, since the desired alignment of the printing screen is already present or can be achieved with minimal adjustment effort. Furthermore, the control unit can be configured, particularly within the context of a screen setup routine, to move the first and second linear drives of the pressure screen movement unit independently of each other from the referenced position until the doctor blade force deviation detected by the sensor along a longitudinal axis of the doctor blade tool is zero or lies within a predefined deviation interval or range. Consequently, the control unit can align the pressure screen relative to the doctor blade tool such that, at a given rebound height, the load on the doctor blade tool is uniform or substantially uniform along a longitudinal axis. In this way, a printing or doctor blade operation with a particularly uniform doctor blade force can be achieved with minimal setup effort. According to a particularly preferred embodiment, the control device can be configured, especially within the context of a screen setup routine, to reference the relative position of the first and second linear drives of the printing screen motion device relative to each other when the doctor blade force deviation detected by the sensor device along a longitudinal extension of the doctor blade tool is zero or lies within a predetermined deviation interval or deviation value range. Consequently, the control device can use such a referencing for subsequent printing or doctor blade operations. In particular, starting from a referenced relative position of the two linear drives relative to each other, either no further adjustment effort or a reduced adjustment effort may be required, since the desired doctor blade force distribution is already present or can be achieved with minimal adjustment effort. According to a further particularly preferred embodiment, the control device can be configured, particularly within the context of a screen setup routine, to move or adjust the doctor blade tool from a first reference position to a second reference position in the direction of movement by means of the positioning device, particularly while maintaining contact with the printing screen or without contact with the printing screen. Consequently, the control device can automatically and / or with minimal effort initiate an adjustment of the doctor blade tool from a first reference position to a second reference position and / or vice versa. Multiple reference positions can then be used for further control and / or regulation. Furthermore, the control unit can be configured, particularly within the context of a screen setup routine, to move a first and a second linear drive together and a third linear drive independently, such that, at a predetermined drop height, the doctor blade force deviation detected by the sensor between the first and second reference positions is zero or lies within a predetermined deviation interval. This ensures that the doctor blade force in the two reference positions remains within a predetermined deviation interval or range, thereby guaranteeing a particularly uniform printing and / or doctor blade process. Preferably, the control device can be configured, particularly within the context of a screen setup routine, to reference the position of a first and second linear drive relative to a third linear drive of the printing screen motion device. Consequently, the control device can use such a reference for subsequent printing or doctor blade operations. In particular, starting from a referenced relative position of the two linear drives to each other, either no further adjustment effort or a reduced adjustment effort may be required, since the desired doctor blade force distribution is already present or can be achieved with minimal adjustment effort. According to a further preferred embodiment, the control device and / or the positioning device can be configured to hold the doctor blade at a defined height position during the printing process. Maintaining a defined height position ensures a continuous, consistent, and uniform print image. Alternatively or additionally, a fixed height position can be maintained during the printing process using the positioning and / or control device. This ensures a continuous, consistent, and uniform print image across the entire print layout of a printing screen with increased reliability. According to a further preferred embodiment, the control device can be configured to force-based control and / or regulation of the doctor blade's height position during the printing process. Force-based control and / or regulation offers the advantage of ensuring that the printing compound is pressed through the printing screen with a constant force or pressure along the doctor blade direction. Force fluctuations can be compensated for. This prevents, for example, an excessively large or insufficient amount of printing compound from being pressed through the printing screen in specific areas. According to a further preferred embodiment, the control device and / or the actuating device can be configured to maintain a defined squeegee force and / or a defined and effective application force during the printing process. This has the advantage that a constant force can be applied with even greater reliability across the entire print layout of the printing screen, thus producing a particularly uniform print image. Fluctuations in the squeegee force can therefore be compensated for or prevented in a particularly advantageous manner. This ensures a particularly high or even further improved print quality. According to a further preferred embodiment, the control unit can be configured to convert, store, and / or process measurement data from continuous and / or recurring acquisitions by the sensor device during movement of the doctor blade device along the direction of movement and / or during a printing process into average values. By converting, storing, and / or processing the acquired measurement data into average values, a suitable database for subsequent control processes can advantageously be created, and an overall low computational effort is ensured. This reduces intensive computational operations of the control unit and further promotes a particularly uniform print image. In addition, this method saves storage space for measured values ​​and measurement data. According to a further preferred embodiment, the control unit can be configured to convert measurement data from continuous and / or recurring acquisitions by individual force sensors during movement of the doctor blade device along the direction of movement by means of the doctor blade movement device and / or during a printing process into average values ​​and / or to store and / or process this data. The information quality can be improved in this way by differentiating data from individual force sensors. At the same time, the amount of data to be processed can be reduced, and the processing, storage, and conversion of data or measured values ​​can be accelerated. A further independent aspect of the present invention relates to a device for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, comprising a printing screen and a squeegee device for flooding the printing screen with a printing compound and / or for pressing printing compound through the printing screen, wherein the squeegee device comprises at least one squeegee tool and a squeegee bearing for supporting the squeegee tool, wherein the squeegee bearing comprises an adjustment device for aligning the squeegee tool, wherein the adjustment device comprises at least one spring bearing which is spring-elastically deflectable by an alignment movement of the squeegee tool, and wherein the adjustment device is designed for automatic alignment of the squeegee tool by spring-supported placement and / or spring-supported pressing of the squeegee tool onto a substrate. In this way, it is particularly advantageous that, when aligning the doctor blade tool, the actuating forces applied for alignment and acting on the doctor blade tool – possibly in addition to the actuating forces generated by the respective self-weight of the doctor blade tool or the doctor blade tool and the components or assemblies rigidly or immovably connected to the doctor blade tool – can be generated at least partially by spring forces and / or superimposed with the actuating forces generated by the self-weight, in particular by spring forces that counteract the respective self-weight and / or act in the direction of the self-weight force.The adjustment device can thus be designed for the automatic alignment of the doctor blade by means of self-weight-based support of the doctor blade on a substrate when superimposed with spring forces, in particular with spring forces that counteract the respective self-weight and / or act in the direction of the self-weight force. According to a preferred embodiment, the spring bearing can apply a spring preload to the doctor blade and / or be configured to apply a spring preload to the doctor blade, particularly in the case of automatic alignment of the doctor blade. Such a preload allows any alignment movements of the doctor blade to be controlled particularly advantageously, and an assumed alignment position can be maintained stably until the doctor blade is fixed in place. According to a further preferred embodiment, the spring mounting can be configured to apply a spring force pressing the doctor blade tool onto the substrate and / or a spring force pushing the doctor blade tool away from the substrate when the tool rests on it. A spring force pressing the doctor blade tool onto the substrate promotes stable and secure contact of the tool and thus precise alignment. A spring force pushing the doctor blade tool away from the substrate prevents excessive pressure on the tool and simultaneously enables a particularly well-controlled alignment movement of the doctor blade tool. According to a further preferred embodiment, the spring mounting can be configured to generate a spring force acting on the doctor blade in the direction of gravity and / or against the direction of gravity. A spring force acting in the direction of gravity can press the doctor blade against a surface, and a spring force acting against the direction of gravity can push the doctor blade away from the surface, thus counteracting the force of gravity. According to a further preferred embodiment, the doctor blade can be spring-loaded, particularly in an unfixed operating position, in a downward direction towards a substrate and / or in an upward direction away from a substrate, by means of the spring mounting. Spring force in the downward direction allows the doctor blade to be pressed particularly advantageously against a substrate. Spring force in the upward direction allows the doctor blade to be pushed particularly advantageously away from the substrate. According to a further preferred embodiment, the spring mounting can comprise at least one spring or a plurality of springs. The spring or springs can act between the adjustment bracket and the support structure. A suitable spring force, for example oriented in the downward direction and / or in the upward direction, can be generated particularly advantageously by such a spring or by several springs. With multiple springs, a stable mounting of the doctor blade device can advantageously be maintained in the respective position. A further independent aspect of the present invention relates to a device for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system and / or an automated 3D screen printing system, comprising a printing screen and a squeegee device for flooding the printing screen with a printing compound and / or for pressing printing compound through the printing screen, wherein the squeegee device comprises at least one squeegee tool and a squeegee bearing for supporting the squeegee tool, wherein the squeegee bearing comprises an adjustment device for aligning the squeegee tool, wherein the adjustment device is designed for automatically aligning the squeegee tool, and wherein the squeegee device comprises a fixing device for screwless and / or friction-fit fixing of the squeegee tool in its aligned position. The doctor blade can be precisely aligned using the adjustment device. This alignment simultaneously allows for the adjustment of the force distribution with which the doctor blade acts on the printing screen or printing table, for example, along its contact line or along its longitudinal extent. Thus, a uniform or adapted force distribution acting on the printing screen and / or the respective printing substrate can be achieved using an adjustment device according to the invention. Any potentially unfavorable centering of the doctor blade can be prevented by precise adjustment. In particular, the alignment ensures the application of uniform, parallel layers. Furthermore, the alignment can be performed automatically and thus fully automatically, in particular without any manual steps after initiating an alignment process. The alignment of the doctor blade tool can be achieved with minimal adjustment effort. The doctor blade can be fixed in its aligned position without screws and / or by friction. Consequently, the device allows for quick and flexible fixing of the doctor blade with minimal adjustment and handling. The risk of operator error is therefore minimized. A further independent aspect of the present invention relates to a device for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system and / or an automated 3D screen printing system, comprising a printing screen, a squeegee device for flooding the printing screen with a printing compound and / or for pressing printing compound through the printing screen, and a control device for executing a squeegee and / or screen device routine. A further independent aspect of the present invention relates to a device for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system and / or an automated 3D screen printing system, comprising a printing screen, a squeegee device having a squeegee tool for flooding the printing screen with a printing compound and / or for pressing printing compound through the printing screen, and a control device for executing a squeegee and / or screen setup routine, wherein the control device is configured to establish, within the framework of a screen setup routine, an effective contact with force exerted by the squeegee tool into the printing screen between the squeegee tool, which is in a screen correction position and preferably aligned by its own weight and / or by spring-assisted placement and / or spring-assisted pressing of the squeegee tool onto a substrate, and the printing screen, which is in a screen correction position.to be produced free from contact between a printing table and / or a printing surface and / or at least one screen printing workpiece by the printing screen and / or by the squeegee tool. The features and advantages of the device for producing three-dimensional screen-printed workpieces, as described above, can also be applied individually or in combination to a device according to the further independent aspects of the present invention described above. A further independent aspect of the present invention relates to a squeegee device. According to the invention, a squeegee device can be provided for a device for producing three-dimensional screen-printed workpieces and / or for a 3D screen printing system, in particular for a device described above. A squeegee device according to the invention can be equipped with at least one squeegee tool for flooding a printing screen with a printing compound and / or for pressing printing compound through a printing screen, wherein the squeegee device comprises at least one squeegee tool and a squeegee bearing for supporting the squeegee tool, wherein the squeegee bearing has an adjustment device for aligning the squeegee tool, wherein the adjustment device is designed for automatic alignment of the squeegee tool by means of self-weight-based support of the squeegee tool on a substrate. A further independent aspect of the present invention also relates to a squeegee device, in particular for a device for producing three-dimensional screen-printed workpieces according to the preceding description and / or for a 3D screen printing system, comprising a squeegee device for flooding a printing screen with a printing compound and / or for pressing printing compound through a printing screen and comprising a squeegee bearing for supporting the squeegee tool, wherein the squeegee bearing has an adjustment device for aligning the squeegee tool, wherein the adjustment device has at least one spring bearing which can be deflected by an alignment movement of the squeegee tool, and wherein the adjustment device is designed for automatic alignment of the squeegee tool by spring-supported placement and / or spring-supported pressing of the squeegee tool onto a substrate. A further independent aspect of the present invention relates to a squeegee device. According to the invention, a squeegee device can be provided for a device, in particular for a proposed device for the production of three-dimensional screen-printed workpieces and / or for a 3D screen-printing system, especially for a device described above.A doctor blade device according to the invention can be equipped with at least one doctor blade tool for flooding a printing screen with a printing mass and / or for pressing printing mass through a printing screen, wherein the doctor blade device has at least one doctor blade tool and a doctor blade bearing for bearing the doctor blade tool, wherein the doctor blade bearing has an adjustment device for aligning the doctor blade tool, wherein the adjustment device is designed for automatically aligning the doctor blade tool, and wherein the doctor blade device has a fixing device for screwless and / or force-fit fixing of the doctor blade tool in its aligned position. Preferably, the adjustment device can have an air bearing device for aligning the doctor blade tool, wherein the adjustment device preferably allows an inclination adjustment of the doctor blade tool by means of the air bearing device about an inclination axis. Furthermore, the air bearing device can have at least one air nozzle. It is pointed out that the features and advantages of the device for producing three-dimensional screen-printed workpieces, as described above, can also be applied individually or in combination to a squeegee device according to the independent aspects of the present invention described above. A further independent aspect of the present invention relates to an adjustment device for a proposed apparatus for the production of three-dimensional screen-printed workpieces and / or for a 3D screen-printing system and / or for a proposed squeegee device for aligning a squeegee tool. It is pointed out that the features and advantages of the device for producing three-dimensional screen-printed workpieces, as described above, and / or the features and advantages of the squeegee device, as described above, can also be applied individually or in combination to an adjustment device according to the independent aspects of the present invention described above. Another independent aspect of the present invention relates to a method for aligning a squeegee tool of a device, particularly one proposed, for producing three-dimensional screen-printed workpieces, and / or for a 3D screen-printing system and / or for a squeegee device, particularly one proposed, in which the squeegee tool is placed on a substrate and the squeegee tool is automatically aligned by its own weight-based support on the substrate. A further independent aspect of the present invention relates to a method for aligning a squeegee tool of a device for producing three-dimensional screen-printed workpieces, in particular according to the preceding description, and / or for a 3D screen-printing system and / or for a squeegee device, in particular according to the preceding description, in which a squeegee tool is placed on a substrate and the squeegee tool is automatically aligned by spring-assisted placement and / or spring-assisted pressing of the squeegee tool onto a substrate. Another independent aspect of the present invention relates to a method for aligning a squeegee tool of a device, particularly one proposed, for producing three-dimensional screen-printed workpieces, and / or for a 3D screen-printing system and / or for a squeegee device, particularly one proposed, in which the squeegee tool is fixed in its aligned position without screws and / or by frictional locking. Preferably, an inclination adjustment can be performed around an inclination axis. Furthermore, an air bearing of the doctor blade tool can be created, whereby the alignment of the doctor blade tool is carried out by means of the air bearing. Preferably, the squeegee tool can be held magnetically during alignment. Preferably, the squeegee tool is held in place during alignment using a permanent magnet. Furthermore, the squeegee tool can be fixed in the aligned position using a force-fit mechanism. According to a preferred embodiment, the doctor blade can be magnetically fixed in the aligned position. According to a further preferred embodiment, the doctor blade can be fixed in the aligned position by at least one electromagnet and / or the doctor blade can be electromagnetically fixed in the aligned position. According to a further preferred embodiment, the doctor blade tool can be force-fitted and / or remain fixed in the aligned position during a doctor blade operation. Furthermore, the doctor blade tool can be magnetically fixed and / or remain fixed in the aligned position during a doctor blade operation, in particular by an electromagnet. According to a further preferred embodiment, during automatic alignment a spring bearing of the doctor blade bearing can apply a spring preload acting on the doctor blade tool. According to a further preferred embodiment, a spring bearing of the doctor blade bearing can, when the doctor blade tool rests on a substrate, apply a spring force pressing the doctor blade tool onto the substrate and / or a spring force pushing the doctor blade tool away from the substrate. According to a further preferred embodiment, a spring bearing of the squeegee bearing can apply a spring force acting on the squeegee tool in the direction of gravity and / or against the direction of gravity. According to a further preferred embodiment, the spring bearing can subject the doctor blade tool, in particular in an unfixed operating position of the doctor blade tool, to spring force in a downward direction pointing towards a substrate and / or in a lifting direction pointing away from a substrate. A further independent aspect of the present invention relates to a method for aligning a squeegee tool of a device, particularly one of the proposed design, for producing three-dimensional screen-printed workpieces, and / or for a 3D screen-printing system, in which an effective contact is generated between a squeegee tool, particularly one located in a screen correction position and / or aligned by its own weight and / or aligned by spring-assisted placement and / or spring-assisted pressing of the squeegee tool onto a substrate, and a printing screen, particularly one located in a screen correction position, with the squeegee tool exerting force on the printing screen in a position free from contact with a printing table and / or a printing surface and / or at least one screen-printed workpiece by the printing screen and / or by the squeegee tool.in which, during the generation of an effective contact between the doctor blade tool and the pressure screen, an increase and / or a deviation of the doctor blade force along a longitudinal direction of the doctor blade tool is detected and / or evaluated via a sensor device, and in which, depending on the detected and / or evaluated data of the sensor device and / or detected and / or evaluated increases and / or deviations of the doctor blade force along a longitudinal extension of the doctor blade tool, the pressure screen is inclined about at least one axis, in particular by means of the pressure screen movement device pivoted and / or tilted about a pressure screen transverse axis and / or pressure screen longitudinal axis. According to a preferred embodiment of the method, it can be provided that, as part of a screen setup routine, the doctor blade tool is raised in an upward movement to a screen correction position from a lowered position and / or a position aligned by its own weight and / or by spring-assisted placement and / or spring-assisted pressing of the doctor blade tool onto a substrate. According to a preferred embodiment of the method, it can be provided that the printing screen is raised in an upward movement as part of a screen setup routine to a screen correction position, in particular free from contact with a printing table and / or a printing substrate and / or at least a screen printing workpiece by the printing screen, wherein the screen correction position of the printing screen is preferably a further raised position than the screen correction position of the squeegee tool. According to a preferred embodiment of the method, it can be provided that the printing screen is moved upwards during a screen setup routine while the squeegee tool is in particular in a screen correction position, in particular free from contact with a printing table and / or a printing substrate and / or at least a screen printing workpiece by the printing screen, and that an increase and / or a deviation of the squeegee force along a longitudinal extension of the squeegee tool is detected and / or evaluated via the sensor device. The details and independent aspects described above with regard to the device and / or the doctor blade device and / or the adjustment device, including the subsidiary aspects relating to a device and / or doctor blade device and / or adjustment device, as well as the advantages described in each case, apply in the same way to the methods according to the invention described above in accordance with the further independent aspects and the respective advantageous embodiments. The invention is described below by way of example with reference to advantageous embodiments and the accompanying figures. The figures show schematically: Fig. 1 a perspective view of a device for producing three-dimensional screen-printed workpieces according to an embodiment of the present invention; Fig. 2 a front view as a sectional view of the device of Fig. 1 in an open state; Fig. 3 a perspective detail view of a printing unit of the device of Fig. 1; Fig. 4 a perspective view of a squeegee device and a squeegee movement device of the device of Fig. 1; Fig. 5 a perspective view of a squeegee device with squeegee tool according to an embodiment of the present invention; Fig. 6 a front view of the squeegee device of Fig. 5 with squeegee tool; Fig. 7 a side view of the squeegee device of Fig. 5 with squeegee tool; Fig. 8 a sectional view of the squeegee device along section line AA of Fig. 7; Fig. 9 a perspective view of a squeegee device of Fig. 5.5 without doctor blade; Fig. 10 a front view of the doctor blade device of Fig. 9 without doctor blade; Fig. 11 a perspective view of a doctor blade of the doctor blade device according to Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10; Fig. 12 a perspective view of a doctor blade movement device with a doctor blade device according to Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10; Fig. 13 a front view of a doctor blade movement device of Fig. 12; Fig. 14 a sectional view of the doctor blade movement device of Fig. 13; Fig. 15a a schematic front view in sectional view of the doctor blade device with a printing table and a printing screen during a fixing of the doctor blade as part of a doctor blade setup routine; Fig. 15b shows a schematic side view in sectional representation of the doctor blade device with a printing table and a printing screen during the fixing of the doctor blade tool as part of a doctor blade setup routine; Fig.Fig. 16a a schematic front view in sectional view of the doctor blade device with a printing table and a printing screen after the printing screen and the doctor blade device have been raised as part of a doctor blade and / or screen setup routine; Fig. 16b a schematic side view in sectional view of the doctor blade device with a printing table and a printing screen after the printing screen and the doctor blade device have been raised as part of a doctor blade and / or screen setup routine; Fig. 17a a schematic front view in sectional view of the doctor blade device with a printing table and a printing screen during an inclination of the printing screen about a first axis as part of a doctor blade and / or screen setup routine; Fig. 17b a schematic side view in sectional view of the doctor blade device with a printing table and a printing screen during an inclination of the printing screen about a first axis as part of a doctor blade and / or screen setup routine; Fig.Fig. 18a a schematic front view in sectional view of the doctor blade device with a printing table and a printing screen during an inclination of the printing screen about a second axis within the framework of a doctor blade and / or screen setup routine; Fig. 18b a schematic side view in sectional view of the doctor blade device with a printing table and a printing screen during an inclination of the printing screen about a second axis within the framework of a doctor blade and / or screen setup routine; Fig. 18c a schematic side view in sectional view of the doctor blade device with a printing table and a printing screen during an inclination of the printing screen about a second axis within the framework of a doctor blade and / or screen setup routine after movement of the doctor blade device in the direction of doctor blade movement; Fig.Fig. 19a is a schematic front view in sectional view of the doctor blade device with a pressure table and a pressure screen during a pressure force determination as part of a doctor blade and / or screen setup routine. Fig. 19b is a schematic side view in sectional view of the doctor blade device with a pressure table and a pressure screen during a pressure force determination as part of a doctor blade and / or screen setup routine. Fig. 1 shows a perspective view of a device 10 for the production of three-dimensional screen-printed workpieces, with Fig. 2 showing a side view of the device 10 from Fig. 1 in an open state, in particular without housing. Fig. 3 shows a perspective view of a printing device 20 of the device 10 from Fig. 1, while Fig. 4 shows a perspective view of a squeegee movement device 74 of the device 10 from Fig. 1. Figures 1, 2, 3 to 4 show a device 10 for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system. The device 10 may preferably be a 3D screen printing system. In particular, the device 10 may be a 3D screen printing system for the production of pharmaceuticals and / or industrial components. The device 10 can be equipped with a pressure screen 12 and with a squeegee device 14 for flooding the pressure screen 12 with a pressure mass and / or for pressing pressure mass through the pressure screen 12, as shown in more detail in Fig. 3 and Fig. 4. The doctor blade device 14 further comprises at least one doctor blade tool 16. Fig. 5 shows a perspective view of a doctor blade device 14 with doctor blade tool 16 according to an embodiment of the present invention. The doctor blade device 14 in Fig. 5 may be the same doctor blade device 14 shown in Figs. 2 to 3 of the device 10. Furthermore, Fig. 6 shows a front view of the doctor blade device 14 from Fig. 5 with doctor blade tool 16. Fig. 7 shows a side view of the doctor blade device of Fig. 5 with doctor blade tool, and Fig. 8 shows a sectional view of the doctor blade device 14 along section line AA of Fig. 7. Fig. 9 further shows a perspective view of a doctor blade device 14 from Fig. 5 without doctor blade tool, Fig. 10 shows a front view of the doctor blade device from Fig. 9 without doctor blade tool, and Fig. 11 shows a perspective view of a doctor blade tool 16 of the doctor blade device 14 according to Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10. The doctor blade device 14 can, in addition to the at least one doctor blade 16, include a doctor blade bearing 34 for supporting the doctor blade 16. Furthermore, the doctor blade device 14 includes a sensor device 18 for detecting doctor blade forces acting on the doctor blade 16. The sensor device 18 can be configured to detect deviations in the doctor blade force along a longitudinal extent L of the doctor blade 16. The longitudinal extent L of the doctor blade 16 is shown in more detail in Figures 3 and 4. Such a sensor device 18 can, for example, ensure a uniform force application by the doctor blade device 14 along the longitudinal extent L of the doctor blade 16. Therefore, the forces acting on the doctor blade 16 can be measured along its longitudinal extent L. This ensures a uniform or deliberately uneven force application from the doctor blade 16 to the printing screen 12. Furthermore, the reliable and monitorable spatial alignment of the doctor blade 16 can also be achieved. As further shown in Figures 2 and 3, the device 10 can also include a printing unit 20 comprising at least the printing screen 12 and / or the squeegee device 14 for the layer-by-layer production of at least one screen-printed workpiece in several screen-printing operations and / or for the layer application onto a workpiece (not shown in detail) in at least one screen-printing operation. The printing unit 20 can, for example, be arranged adjacent to other functional areas of the device 10, such as an inspection area for screen-printed workpieces and / or a drying area for screen-printed workpieces. The dimensions of the printing unit 20 can be essentially determined by the printing screen 16 and / or by a frame holder and / or suspension for the printing screen 16 and / or limited by a printing table 22. The printing device 20 can have at least one printing table 22 for positioning a workpiece carrier and / or a screen printing workpiece below the printing screen 12 and / or below the squeegee device 14, as shown in more detail in Fig. 2, Fig. 3 and Fig. 4. Figures 5, 6, 7, 8, 9 to 10 show the squeegee device 14 of the device 10 for producing three-dimensional screen-printed workpieces, as already described above. Figure 8, in particular, shows that the sensor device 18 can have at least two force sensors 24, which can be two force sensors 24 connected in parallel. Fig. 8 shows a squeegee tool 16 in a sectional view, from which the force measuring sensors 24 can be removed. The force measuring sensors 24 are arranged at intervals along a longitudinal extent L of the doctor blade tool 16. This allows it to be determined whether the force exerted by the doctor blade tool 16 on the printing screen 12 and / or on the printing table 22 is uniform or not. This allows the alignment of the doctor blade 16 to be checked and, if necessary, a further adjustment to be initiated, all with minimal handling effort. This alignment enables, in particular, the creation of parallel layer thicknesses or the reproducible and consistent application of a parallel layer to a workpiece (not shown here) or workpiece carrier (not shown here) across multiple printing processes and / or with exceptional uniformity across the printing layout of a printing screen. Furthermore, the spatial alignment or orientation of the doctor blade 16 can be verified using the force sensors 24 by comparing the forces detected by the force sensors 24. Furthermore, the force measuring sensors 24 can be configured for the simultaneous measurement of absolute doctor blade forces at measuring points spaced apart from one another along the longitudinal extent L of the doctor blade tool 16. This allows for a direct comparison of the recorded or measured doctor blade forces of the force measuring sensors 24 with each other and thus creates a further improved information and data basis for subsequent and / or ongoing printing processes. Alternatively or additionally, the force sensors 24 can be configured to detect relative doctor blade force deviations at measuring points spaced apart along the longitudinal extent L of the doctor blade tool 16. Detected differences or deviations in the doctor blade force along the longitudinal extent L of the doctor blade tool 16 can thus be advantageously used for controlling and / or regulating subsequent and / or ongoing printing processes. This ensures that the doctor blade tool 16 rests on or contacts the respective printing screen 12 with a doctor blade force or forces within the desired parameters. Furthermore, Figures 7 and 8 show that, in a top view of the doctor blade device 14, the force measuring sensors 24 can be aligned above and / or with a contact line of the doctor blade tool 16, or only slightly offset from a contact line. This allows unfavorable moments on the doctor blade device 14 to be reduced and, if necessary, the measurement result of the force measuring sensors 24 to be improved. Furthermore, Figures 5, 6, 7, 8, 9 to 10 show that the doctor blade device 14 has an adjustment device 28, which is designed for the automatic alignment of the doctor blade tool 16 by means of weight-based support of the doctor blade tool 16 on a substrate. In this way, the doctor blade tool 16 can be automatically aligned relative to a substrate, such as the printing table 22 or a workpiece carrier, requiring no or only minimal handling effort. The adjustment device 28 is designed in particular for the automatic alignment of the doctor blade 16 with respect to at least two degrees of freedom. Thus, the doctor blade 16 can preferably be aligned vertically along the force of gravity and with respect to a further degree of freedom by means of the adjustment device 28. Furthermore, the adjusting device 28 can be designed to adjust the inclination of a tool longitudinal axis running along the longitudinal extent L of the doctor blade tool 16 relative to the printing screen 12 and / or relative to a printing table 22 and / or relative to a horizontal plane. It is possible to configure the adjustment device 28 for adjusting the inclination of a doctor blade's lower edge relative to the printing screen 12 and / or relative to the printing table 22 and / or relative to a horizontal plane. This allows the doctor blade tool 16 to be inclined relative to the printing screen 12 and / or relative to the printing table 22 and / or relative to a horizontal plane. The doctor blade's lower edge can thus be aligned parallel to the printing screen 12 and / or relative to the printing table 22 and / or relative to a horizontal plane. By adjusting the inclination of the doctor blade 16 and / or one of its lower edges, the force distribution with which the doctor blade 16 or its lower edge acts on the printing screen 12 or the printing table 22 along its contact line and along its longitudinal extent L can be appropriately adjusted. Thus, a uniform or intentionally uneven force distribution of the doctor blade assembly onto the printing screen 12 and / or the printing table 22 can be achieved using the adjustment device 28. Furthermore, Figures 5, 6, 7, 8, 9 to 10 show that the adjusting device 28 for adjusting the inclination of the doctor blade 16 can be configured about an inclination axis N. The inclination axis N extends along a doctor blade movement direction R and / or at an angle to a vertical plane passing through a doctor blade lower edge. The presented configuration allows for precise alignment between the doctor blade 16 and the printing screen 12 and / or the printing table 22 along the entire length of the doctor blade 16. In this way, the squeegee force with which the squeegee tool 16 acts on the respective printing screen 12, especially at different points of the printing layout of the printing screen 12, can be specifically adjusted or leveled or compensated. As further shown in Figs. 5, 6, 7, 8, 9 to 10, the adjusting device 28 can have an air bearing device 30 which allows alignment of the doctor blade 16 in air bearing operation. In particular, the air bearing device 30 allows automatic alignment and / or alignment by weight-based support of the doctor blade 16 on a substrate. The air bearing device 30 preferably allows the doctor blade tool 16 to be tilted about the tilt axis N. This allows the doctor blade tool 16 to be pivoted about the tilt axis N relative to the printing screen 12 and / or to the printing table 22 and / or relative to a horizontal plane. Furthermore, the air bearing device 30 can be designed for adjusting the inclination of a tool longitudinal axis running along the longitudinal extent L of the doctor blade tool 16 relative to the pressure screen 12 and / or relative to a pressure table 22 and / or relative to a horizontal plane. As shown in Figures 9 and 10, the air bearing device 30 has at least one air nozzle 32 or several air nozzles 32 for forming a frictionless air bearing for the doctor blade 16 during air bearing operation. The air bearing allows the doctor blade 16, or rather its lower edge, to be aligned frictionlessly and in a particularly simple manner. In particular, adjustment of the doctor blade 16 can be made solely against its own weight. The air bearing assembly 30 can, in friction bearing operation, allow the doctor blade 16 to be fixed by friction relative to the axis of inclination N. Alternatively or additionally, the air bearing assembly 30 can, in friction bearing operation, allow the doctor blade 16 to be fixed by friction in the vertical direction, in particular in and / or against a direction of gravity. In this way, the doctor blade 16 can be reliably fixed with respect to two degrees of freedom by means of the air bearing assembly 30. Furthermore, it can be seen from Figures 5, 6, 7, 8, 9, 10 to 11 that the doctor blade device 14 can have an adjustment bracket 36 and a support structure 38 coupled to the adjustment bracket 36. A doctor blade tool 16 can be arranged on the support structure 38, as shown, for example, in Figures 5, 6, and 11, and as described below. In particular, the relative position of the support structure 38 to the adjustment bracket 36 and / or the relative alignment between the adjustment bracket 36 and the support structure 38 can be changed by means of the air bearing device 30. Alternatively or additionally, the squeegee tool 16 can be arranged or attached to the support structure 38, as shown by example in Fig. 11. The doctor blade bearing 34 can be configured between the adjustment bracket 36 and the support structure 38. Furthermore, the air bearing assembly 30 can be configured between the adjustment bracket 36 and the support structure 38. Alternatively or additionally, the air bearing assembly 30 can be configured to form an air bearing between the adjustment bracket 36 and the support structure 38. In this way, the adjustment bracket 36 can be adjusted relative to the support structure 38 with virtually no friction in an air bearing operation. The air bearing device 30 and / or the at least one air nozzle 32 of the air bearing device 30 can be arranged on the adjustment bracket 36. Alternatively or additionally, the air bearing device 30 and / or the at least one air nozzle 32 of the air bearing device 30 can be in operative contact with the support structure 38 and / or be capable of being brought into operative contact with the support structure 38. The air bearing device 30 can allow a relative movement between the adjusting bracket 36 and the support structure 38, especially in an air bearing operation. As shown in Fig. 8, the doctor blade bearing 34 and / or the air bearing assembly 30 can have one or more permanent magnets 40 for magnetically holding the doctor blade tool 16 and / or the support structure 38. The at least one permanent magnet 40 can generate a preload or preload force of the support structure 38 against the adjustment bracket 36 and / or against the air bearing assembly 30 arranged on the adjustment bracket 36. In particular, the permanent magnets 40 are designed to hold at least 80% of the weight of the doctor blade tool 16. The at least one permanent magnet 40 is preferably configured with the air bearing device 30 in an air bearing operation to generate and / or maintain an air bearing between the support structure 38 and the adjustment bracket 36. The air bearing prevents contact between the support structure 38 and the adjustment bracket 36. Furthermore, it ensures efficient and frictionless adjustment of the support structure 38 relative to the adjustment bracket 36, and the permanent magnet 40 can maintain a predefined air bearing gap during air bearing operation. As shown in Figures 8, 9 to 10, the doctor blade device 14 can have at least one fixing device 42 for fixing an adjusted inclination position of the doctor blade tool 16, in particular an inclination position of the doctor blade tool 16 adjusted via the adjustment device 28 and / or air bearing device 30. The fixing device 42 is designed in particular for screwless and / or friction-fit fixing of the doctor blade tool 16 in its aligned position. The at least one fixing device 42 is designed and / or configured in particular for fixing the relative position and / or relative alignment between the adjustment bracket 36 and the support structure 38. As further shown in Figs. 8, 9 to 10, the fixing device 42 can have an electromagnet 44 or a plurality of electromagnets 44 for magnetically fixing the doctor blade tool 16 in a working position, in particular in a working position of the doctor blade tool 16 adjusted via the adjusting device 28 and / or air bearing device 30. The at least one electromagnet 44 and / or the at least one permanent magnet 40 can be arranged on or associated with the adjustment bracket 36 and / or the support structure 38. The at least one electromagnet 44 and / or the at least one permanent magnet 40 are preferably arranged on or associated with the adjustment bracket 36, wherein the support structure 38 is ferromagnetic. The ferromagnetic support structure 38 can then interact in a simple and efficient manner with the at least one permanent magnet 40 for holding the doctor blade 16 and / or with the at least one electromagnet 44 for fixing the aligned doctor blade 16. As further shown in Figs. 9 and 10, the at least one electromagnet 44 can be at least partially surrounded by an air nozzle 32. This arrangement reliably prevents the adjustment bracket 36 from shifting relative to the support structure 38 when the electromagnet 44 is switched on and the air nozzle 32 is switched off, thus enabling particularly precise fixing of the aligned doctor blade 16. The fixing device 42 may additionally or alternatively have at least one mechanical and / or pneumatic and / or hydraulic clamping device for fixing the doctor blade tool 16 and / or the support structure 38 in a working position, in particular in a working position of the doctor blade tool 16 adjusted via the adjusting device 28 and / or air bearing device 30. As shown by way of example in Figs. 5, 6 and 11, the doctor blade bearing 34 can have at least one slotted guide 46, wherein the slotted guide 46 is preferably dimensioned with clearance, particularly with regard to the guide elements to be inserted into the slotted guide 46 and which will be described below, for example in the form of retaining pins 50. Such a slotted guide 46 can limit the mobility of the doctor blade tool 16 during adjustment or setting processes, in particular limiting or guiding the relative movement between the adjustment holder 36 on the one hand and the support structure 38 or the doctor blade tool 16 on the other. The doctor blade device 14 can further comprise a fastening system 48 for fastening and / or holding the doctor blade tool 16, wherein the fastening system 48 is preferably designed as a holding system and / or as a quick-change holding system. The fastening system 48 can be actuated without tools and / or comprise a retaining pin 50 or a plurality of retaining pins 50 for holding or temporarily holding the doctor blade tool 16, in particular for hooking the doctor blade tool 16 and / or the support structure 38 onto the retaining pins 50 and / or for sliding the doctor blade tool 16 and / or the support structure 38 onto the retaining pins 50 and / or for releasing a doctor blade tool 16. The fastening system 48 can include the slotted guide 46. Alternatively or additionally, the fastening system 48 can include the fixing device 42. As further shown in Figures 5, 6, and 11, the at least one retaining pin 50 can be guided, in particular with play, in a slotted guide 46 of the doctor blade bearing 34. In this way, movement of the retaining pin 50 in the slotted guide 46 can be ensured, in particular in several dimensions. In particular, the retaining pin 50 can be adjustable in the vertical direction, in particular along the direction of gravity, within the slotted guide 46. The retaining pin 50 can then be adjustable, in particular displaceable, relative to the slotted guide 46. Likewise, the retaining pin 50 can be movable in a direction transverse to the vertical direction within the slotted guide 46. As further shown in Figs. 5 and 6, the adjusting bracket 36 can have at least one retaining pin 50. Therefore, in Fig. 11, the retaining pins 50 of the adjusting bracket 36 are shown only as dashed lines. Alternatively or additionally, the support structure 38 can have at least one slotted guide 46. Preferably, each retaining pin 50 is assigned a slotted guide 46 and / or each slotted guide 46 is assigned a retaining pin 50. The support structure 38 with the doctor blade 16 can be easily attached to the retaining pins 50 of the adjustment bracket 36. The support structure 38 is then preferably held on the adjustment bracket 48 by means of the slotted guides 46. The support structure 38 can thus be adjusted relative to the adjustment bracket 36, in particular to the retaining pins 50 of the adjustment brackets 36, via the slotted guide 46, thereby enabling the doctor blade 16 to be aligned within predefined limits of movement. With reference to Figures 5, 6, 7, and 11, it can be seen that the doctor blade 16 can have a doctor blade 52. The doctor blade 52 of the doctor blade 16 can be made, at least partially, of a plastic material and / or a sheet metal material. Furthermore, the doctor blade 16 can have a doctor blade holder 54. The doctor blade 52 is mounted on the doctor blade holder 54 of the doctor blade 16 and clamped in or on the doctor blade holder 54. Thus, a doctor blade 52 of the doctor blade 16 can be fixedly arranged on the doctor blade holder 54. According to Fig. 7, the doctor blade 52 can have two doctor blade side surfaces 56 which run between the side edges of the doctor blade 52, wherein a doctor blade angle β formed between a doctor blade side surface 56 and a vertical plane and / or a doctor blade angle formed between a doctor blade side surface 56 and a horizontal plane and / or between a doctor blade side surface 56 and the printing screen 12 and / or between a doctor blade side surface 56 and the printing table 22 is specified or determined by the doctor blade holder 54. Thus, by the design of the doctor blade 52 or by the design of the doctor blade holder 54 and / or by an inclination adjustment of the doctor blade holder 54 and / or the doctor blade tool 16 - as described below - a possible doctor blade angle β can be selected or set up such that the pressure screen 12 is flooded and / or pressed through the pressure screen 12 in a suitable manner by the respective doctor blade 52. The doctor blade 16 can be designed as an interchangeable tool. Alternatively or additionally, the doctor blade angle between a doctor blade side surface 56 and a horizontal plane and / or the printing screen 12 and / or a printing table 22 can be changed by exchanging the doctor blade 16. Preferably, the doctor blade tool 16 has an adjustment device 58 for adjusting the doctor blade angle between a doctor blade side surface 56 and a horizontal plane and / or the printing screen 12 and / or a printing table 22, wherein the doctor blade angle is preferably infinitely variable or stepwise, in particular by means of predetermined steps, by means of the adjustment device 58. The doctor blade tool 16 can have at least one coupling section 60 formed on and / or connected to the doctor blade holder 54 for connection to the doctor blade device 14 by means of the doctor blade bearing 34, in particular the fixing device 42 and / or the air bearing device 30. The coupling section 60 can be formed by the support structure 38 or be a component of the support structure 38. The coupling section 60 can in particular be a catch plate. As further shown in Fig. 11, the doctor blade tool 16 can have at least one retaining element 62 formed on and / or connected to the doctor blade holder 54, wherein the coupling section 60 can be connected to the retaining element 62 in at least two different positions, such that the doctor blade angle is different in the different positions. The retaining element 62 can thus have several mounting holes through which it can be connected to the coupling section 60. Depending on which mounting holes the retaining element 62 is connected to the coupling section 60, a different doctor blade angle can be formed. As can be seen in Figures 2, 3, 4, 5, 6, 7, 8, 9 to 10, and 12 to 14, the doctor blade device 14 can have an adjusting device 70 for moving the doctor blade tool 16 between a raised starting position and at least one lowered operating position. The adjusting device 70 can have one or more linear drives 72, as shown, for example, in Figure 10. The adjusting device 70 can also have multiple linear drives 72 connected in series. Thus, the doctor blade device 14 can be moved, for example, towards or away from the printing table 22 and / or towards or away from the printing screen 12 by means of the adjusting device 70. A linear drive 72 of the positioning device 70 can be designed as an electric or electromechanical linear drive and / or as an electric spindle drive and / or as an electric cylinder and / or as a linear actuator. Furthermore, the linear drive 72 of the positioning device 70 can be designed as a pneumatic linear drive or linear cylinder. Furthermore, Fig. 8 shows that the sensor device 18 can be arranged in the force path between the actuating device 70 and the doctor blade tool 16. In particular, the sensor device 18 can be arranged in the force path between the actuating device 70 and the doctor blade bearing 34 and / or in the force path between the actuating device 70 and the adjustment device 28 and / or in the force path between the actuating device 70 and the adjustment bracket 36. Alternatively, the sensor device 18, or one of its components, can also be arranged in the force path between the adjustment bracket 36 and the support structure 38. Figures 12, 13 to 14 further show that a device 10 according to the present invention can have a doctor blade movement device 74 for moving the doctor blade device 14 and / or the doctor blade tool 16 along a doctor blade movement direction R extending in the horizontal direction. Figure 12 shows a schematic perspective view of a doctor blade movement device 74 according to an embodiment of the present invention. Figure 13 shows a front view and Figure 14 a sectional view of a doctor blade movement device 74 from Figure 12. It is possible to move the doctor blade tool 16 or the doctor blade device 14 along a doctor blade movement direction R running in a horizontal direction by means of the doctor blade movement device 74. The doctor blade movement device 74 can have at least one linear drive or several linear drives for moving the doctor blade device 14 and / or the doctor blade tool 16. The doctor blade device 14 and / or the doctor blade tool 16 can therefore be moved linearly back and forth in one direction. Furthermore, Figures 12, 13 to 14 show that the squeegee movement device 74 can have a portal system with linear guides 76 and a crossbeam 78, as well as support devices 80 for supporting the crossbeam 78 on the linear guides 76. The linear guides 76 run along the squeegee movement direction R, with the crossbeam 78, in a top view, running between the linear guides 76 and transversely to them. Thus, it is possible to hold the squeegee tool 16 or the squeegee device 14 suspended above the printing table 22 and / or suspended above the printing screen 12 and to move it linearly. This ensures a reliable sequence of successive printing passes with the device 10 for the production of three-dimensional screen-printed workpieces. Furthermore, Figures 12, 13 to 14 show that the doctor blade device 14 and the adjusting device 70 of the doctor blade device 14 can be attached to the crossbeam 78 of the portal system. Thus, a movement of the crossbeam 78 results in a movement of the doctor blade device 14 or the doctor blade tool 16. In addition, the doctor blade device 14 is fixed along a longitudinal extension L of the crossbeam 78. This prevents unwanted movements along the crossbeam 78 and results in an overall robust construction. Figures 15a to 19b show schematic front views and side views of the doctor blade device 14 with a printing table 22 and a printing screen 12 during an alignment of the doctor blade tool 16 within the framework of a doctor blade setup routine for aligning the doctor blade tool 16 and a screen setup routine for aligning the printing screen 12, respectively. According to Figures 15a to 19b, the device 10 can have a pressure sieve device 64. The pressure sieve device 64 can have a pressure sieve movement device 66 for moving the pressure sieve 12 between a raised test position and at least one lowered pressure position. The printing screen 12 can be adjusted relative to the printing table 22 and / or workpiece carrier and / or screen printing workpiece by means of the printing screen movement device 66. The squeegee force acting on the printing screen 12 during the printing process can be positively influenced by means of the printing screen movement device 66 in order to ensure uniform and / or parallel and / or aligned layers. As further shown in Figures 15a to 19b, the pressure screen movement device 66 can have at least one linear drive 67, 68, 69 or a plurality of linear drives 67, 68, 69. The pressure screen 12 can be reliably and precisely adjusted by means of the at least one linear drive 67, 68, 69. According to Figures 15a to 19b, the pressure screen movement device 66 can have two linear drives 67, 68 spaced apart from each other along the longitudinal extent L of the doctor blade tool 16. In particular, the pressure screen movement device 66 can have a first linear drive 67 and a second linear drive 68, wherein the linear drives 67, 68 are arranged on opposite transverse sides of the pressure screen 12 or assigned to opposite transverse sides of the pressure screen 12 and / or are spaced apart from each other along the longitudinal extent L of the doctor blade tool 16 and / or are spaced apart from each other transversely, in particular perpendicularly, to the direction of doctor blade movement R. Advantageously, the printing screen 12 can be pivoted or tilted relative to the doctor blade tool 16 and / or relative to the printing table 22 and / or relative to a horizontal plane by means of the printing screen movement device 66. As shown, for example, in Figs. 17a and 17b, the pressure screen 12 can be pivoted or tilted about a pressure screen longitudinal axis S by means of the pressure screen movement device 66. This longitudinal axis extends perpendicular to the connecting line between the two linear drives 67, 68 and perpendicular to the pressure screen transverse axis D, respectively. The pressure screen longitudinal axis S runs in particular in and / or parallel to the doctor blade movement direction R. The pressure screen transverse axis D runs in particular parallel to the longitudinal extent L of the doctor blade tool 16. The printing screen 12 can be advantageously adapted to the orientation of the doctor blade 16, or aligned relative to the doctor blade 16, by means of the linear drives 67, 68, 69. In this way, a uniform doctor blade force in the longitudinal direction L of the doctor blade 16 can be ensured on the printing screen 12 during a printing process. According to Figures 15a to 19b, the pressure screen movement device 66 can have a third linear drive 69, wherein the third linear drive 69 is arranged on or may be associated with a longitudinal side of the pressure screen 12. Alternatively or additionally, the third linear drive 69 can be spaced apart from the first and second linear drives 67, 68 in the direction of the doctor blade movement R and / or along the longitudinal axis S of the pressure screen and / or transversely, in particular perpendicularly, to the longitudinal extent L of the doctor blade tool 16. The printing screen 12 can thus be additionally or alternatively pivoted or tilted about a printing screen transverse axis D by means of the printing screen movement device 66, as shown in Figures 18a to 18c. The printing screen transverse axis D can preferably run transversely, in particular perpendicularly, to the printing screen longitudinal axis S and / or parallel to the longitudinal extent L of the doctor blade tool 16. By pivoting the printing screen 12 about the printing screen transverse axis D, a doctor blade force acting on the printing screen 12 can advantageously be kept constant during a printing process along the doctor blade movement direction R, thereby achieving a particularly uniform and precise printing result. The following section explains in more detail the operating mode of a device 10 described above for the production of three-dimensional screen-printed workpieces, in particular a 3D screen printing system. In particular, a squeegee setup routine and a screen setup routine are explained in detail. Insofar as the following refers to training of the control unit 100, this may additionally or alternatively include a corresponding configuration and / or setup of the control unit 100 for carrying out the respective processes and procedures. As shown by way of example in Fig. 6 and Fig. 8, the device 10 can have a control device 100 for controlling and / or regulating the actuating device 70 and / or the pressure screen movement device 66 and / or the fixing device 42 and / or the doctor blade movement device 74 and / or the air bearing device 30 and / or for processing and / or evaluating and / or storing and / or comparing sensor data from the sensor device 18. Therefore, the control unit 100 is capable of controlling, regulating, and processing the aforementioned devices and their data. The control unit 100 can be a so-called machine control and / or machine regulation system. Such a control device 100 may also be equipped with and / or connected to an operating unit for operation by the operating personnel, which is not shown in detail here. The control device 100 can also be designed to detect and / or evaluate a squeegee force via the sensor device 18 when force is applied by the squeegee tool 16 directly to a printing table 22 and / or in a screen-free arrangement. Furthermore, the control device 100 can be designed to detect and / or evaluate a squeegee force via the sensor device 18 when force is applied by the squeegee tool 16 to a pressure screen 12 in an operating position in which the pressure screen 12 is resting on a pressure table 22. Furthermore, the control device 100 can be configured to detect and / or evaluate a squeegee force via the sensor device 18 when force is applied by the squeegee tool 16 to a printing screen 12, free from contact between the printing screen 12 and a printing table 22 and / or between the printing screen 12 and a printing base and / or between the printing screen 12 and at least one screen printing workpiece, particularly when the squeegee tool 16 is fixed. Furthermore, the control device 100 can be configured to detect and / or evaluate a squeegee force via the sensor device 18 when force is applied by the squeegee tool 16 to a printing screen 12 and when contact is generated by the force on the printing screen 12 with a printing table 22 and / or a printing base and / or at least one screen printing workpiece by the printing screen 12, in particular in the case of elastic deformation of the printing screen 12. The control unit 100 can be configured to detect and / or evaluate an increase in doctor blade force via the sensor unit 18 during a lowering movement of the doctor blade tool 16 carried out by means of the actuating device 70. Thus, the control unit 100 is able to reliably detect and / or evaluate the increase in doctor blade forces with the help of the sensor unit 18. Furthermore, the control device 100 can be configured to detect and / or evaluate an increase in squeegee force via the sensor device 18 during a lowering movement of the squeegee tool 16 by means of the actuating device 70 exclusively onto the printing screen 12, in particular free from contact with a printing table 22 and / or a printing base and / or at least a screen printing workpiece by the printing screen 12. The control device 100 can be configured to detect and / or evaluate an increase in squeegee force via the sensor device 18 during a lowering movement of the doctor blade tool 16 by means of the positioning device 70 onto the pressure screen 12, in an operating position with the pressure screen 12 resting on a pressure table 22. Furthermore, the control device 100 can be designed to detect and / or evaluate an increase in squeegee force via the sensor device 18 during a lowering movement of the doctor blade tool 16, in particular in a screen-free arrangement, by means of the positioning device 70 onto a printing table 22 and / or onto a printing surface. Furthermore, the control device 100 can be configured to terminate a lowering movement by the positioning device 70 when the sensor device 18 detects the beginning of an increase in squeegee force during the lowering of the squeegee tool 16, or to terminate the lowering movement by the positioning device 70 after a predetermined lowering stroke. Consequently, the control device 100 can be used to terminate the lowering of the doctor blade 16 when a specific or predetermined squeegee force is reached, or to terminate the lowering after a predetermined stroke. This can serve to protect the doctor blade 16 or the doctor blade assembly 14, as well as the printing screen 12 and / or the printing table 22. The control unit 100 can further be configured to automatically or semi-automatically reference a doctor blade height when the sensor unit 18 detects the beginning of an increase in doctor blade force during the lowering of the doctor blade tool 16. This can mean that the control unit 100, based on an incipient increase in doctor blade force or the incipient increase in doctor blade force during the lowering of the doctor blade tool 16, defines a possible doctor blade height, for example, a target height or target position of the doctor blade tool 16, as a reference, which in turn can serve as a reference for subsequent processes. Furthermore, the control unit 100 is configured to detect and / or evaluate deviations in the doctor blade force along a longitudinal extension L of the doctor blade 16 via the sensor unit 18 during a lowering movement of the doctor blade tool 16 by means of the positioning unit 70. Accordingly, the control unit 100 can detect, compare, and / or evaluate doctor blade forces along the longitudinal extension L of the doctor blade tool 16. This makes it possible, for example, to promote a uniform force distribution along the longitudinal extension L of the doctor blade tool 16 using the control unit 100, so that the force of the doctor blade tool 16 on the printing screen 12 and / or on the printing table 22 and / or on the respective workpieces remains constant along the longitudinal extension L of the doctor blade tool 16. The control unit 100 can also be configured to automatically perform an inclination adjustment using the adjustment device 28 when a deviation in the doctor blade force is detected by the sensor device 18 along a longitudinal extension L of the doctor blade 16. In this way, the spatial orientation of the doctor blade 16 can be selectively initiated, set, and / or corrected with minimal handling effort using the adjustment device 28 and the sensor device 18, so that the desired doctor blade force or force distribution can be set along a longitudinal extension L of the doctor blade 16 and / or along its entire length. The automatic or semi-automatic setting, inclination adjustment, and / or correction can be carried out with minimal handling effort. Furthermore, the control unit 100 can be set up and / or trained to perform a doctor blade setup routine. The control unit 100 can be configured, particularly during a doctor blade setup routine, to adjust the doctor blade device 14 into a doctor blade change position by means of the adjusting device 70. In the doctor blade change position, the doctor blade tool 16 can be changed or replaced in a particularly simple manner manually, semi-automatically, or automatically, thus requiring only minimal handling effort for changing the doctor blade tool 16. It is also possible that the control unit 100 is configured, particularly during a doctor blade setup routine, to detect and / or recognize whether a doctor blade tool 16 is attached to or connected with the doctor blade bearing 34 and / or the doctor blade device 14, in particular via a doctor blade force detected by the sensor device 18 and / or via the dead weight of the doctor blade tool 16 or of the doctor blade tool 16 and thus rigidly connected components or assemblies detected by the sensor device 18. By detecting whether a doctor blade tool 16 is attached to the doctor blade device 14 and / or doctor blade bearing 34, a doctor blade setup routine can be initiated with minimal effort and high process reliability. Furthermore, the control device 100 can be configured, particularly during a doctor blade setup routine, during a lowering movement of the doctor blade tool 16 by means of the positioning device 70, to activate or keep activated the air bearing or air bearing device 30, in particular the at least one air nozzle 32, and to deactivate and / or keep inactive the at least one electromagnet 44. During the doctor blade setup routine, the reliable formation of the air bearing for aligning the doctor blade tool 16 can thus be ensured. Furthermore, it is possible that the control unit 100 is configured, particularly during a doctor blade setup routine, to terminate a lowering movement by the actuating device 70 upon a force reference value detected by the sensor device 18, and / or to continue a lowering movement by the actuating device 70 by a predetermined lowering stroke, and / or to terminate it after a predetermined lowering stroke. Thus, the lowering movement can be terminated upon contact with a surface, particularly the printing table 22, especially when the doctor blade tool 16 rests on a surface, particularly the printing table 22. The doctor blade tool 16 then preferably rests on the surface and / or is aligned with the surface. The control unit 100 can be configured, particularly during a doctor blade setup routine, to terminate a lowering movement by the positioning device 70 and / or to continue a lowering movement by the positioning device 70 by a predetermined lowering stroke and / or to terminate it after a predetermined lowering stroke when a doctor blade force deviation is detected by the sensor device 18 along a longitudinal extent L of the doctor blade 16. The lowering movement of the doctor blade 16 can then be terminated depending on a doctor blade force deviation along the longitudinal extent L of the doctor blade. In Figs. 15a and 15b, the doctor blade tool 16 is shown after completion of a lowering movement, in particular a lowering movement within the scope of a doctor blade setup routine, by the positioning device 70. During such a lowering movement, the air bearing or air bearing device 30, in particular the at least one air nozzle 32, can be activated or kept activated, and the at least one electromagnet 44 can be deactivated and / or left inactive. With the activation of the air bearing or air bearing device 30, the doctor blade tool 16 falls into a lower vertical end position relative to the adjustment position 36, which can be determined by the slotted guides 46 or the interaction of the slotted guides 46 and the retaining pins 50 arranged therein. Before the doctor blade 16 comes into contact with a substrate, the sensor device 18 or the force sensors 24 can be referenced or reset to an initial value. In this position, the weight of the doctor blade 16, suspended from the two force sensors 24, is compensated, in particular metrologically compensated. Such a reset or referencing of the sensor device 18 and / or the force sensors 24 can be carried out by the control unit 100. Due to the active air bearing or air bearing device 30, deflection or movement of the doctor blade 16 relative to the adjustment position 36 can occur with only minimal force. In particular, with sufficient lowering movement by the adjusting device 70, a weight-based support of the doctor blade 16 on a surface—for example, on the printing table 22 or on the printing screen 12, which in turn rests on the printing table 22 or is arranged at the same height as the printing table 22—can be achieved in this way. With the air bearing or air bearing device 30 activated and the electromagnet 44 or the fixing device 42 simultaneously inactive, this weight-based support ensures automatic alignment of the doctor blade 16. At the end of its lowering movement, the doctor blade 16 rests on the printing table 22 or on the printing screen 12, which rests on the printing table 22, and is aligned relative to it. The doctor blade 16 is aligned parallel to the printing table surface or the printing screen 12 by virtue of its own weight. Thus, the weight of the doctor blade 16, together with the lowering movement by the adjusting device 70, is responsible for aligning the doctor blade 16 relative to the printing table 22 and / or the printing screen 12. In particular, the control device 100 can be configured, especially in a doctor blade setup routine, to continue a lowering movement by the positioning device 70 by a predetermined lowering stroke when a force reference value is detected via the sensor device 18, corresponding to the doctor blade tool 16 resting on a substrate. This lowering movement is specifically for a fixed free stroke and / or half the insertion play of the doctor blade tool along the slotted guides and / or half the length of the slotted guides 46, and then to terminate the lowering movement after a predetermined lowering stroke. In this position of the doctor blade tool 16, it can thus be ensured that the doctor blade tool rests parallel to the printing screen 12 or the printing table 22 under its own weight, and that no collision can occur within the mechanically defined slotted clearance of the slotted guides 46. The control device 100 can further be configured, particularly during a doctor blade setup routine, to activate and / or keep activated the at least one electromagnet 44 after completion of a lowering movement by the positioning device 70, and / or to deactivate and / or keep deactivated the air bearing or air bearing device 30, in particular the at least one air nozzle 32. The previously aligned doctor blade tool 16 can be fixed by means of the at least one electromagnet 44. The squeegee tool 16 is aligned and fixed in this position relative to the substrate. This ensures the even application of layers, especially parallel ones. The force measuring sensors 24 can remain active or be switched off after the squeegee tool 16 has been fixed. Furthermore, it is possible that the control device 100 is configured, particularly during a doctor blade setup routine, after completion of a lowering movement by the positioning device 70 and / or activation of the at least one electromagnet 44 and / or deactivation of the air bearing or air bearing device 30, to reference the position of the doctor blade tool 16. The control device 100 can thus define a doctor blade height, for example, a target height or target position of the doctor blade tool 16, and / or an inclination position of the doctor blade tool 16 as a reference, which in turn can serve as a reference for subsequent processes. The control device 100 can be configured, particularly during and / or for a doctor blade operation, to change the position of the doctor blade tool 16 relative to the referenced position by means of a lowering or raising movement via the adjusting device 70, in particular to set a target doctor blade force, preferably a predetermined one, during a doctor blade operation. This setting ensures a predetermined target doctor blade force during a doctor blade operation, thereby achieving a particularly advantageous printing result. The target doctor blade force can be set using the sensor device 18 or the force measuring sensors 24. Using the control unit 100 and the sensor device 18, in particular the force measuring sensors 24, a doctor blade force can be measured, determined and / or monitored. Furthermore, the control device 100 can be configured to move the doctor blade 16 upwards by means of the positioning device 70 after activation of the at least one electromagnet 44, in particular to a screen correction position. Moving the doctor blade 16 to such a screen correction position can be carried out in particular during, at the end of, or after a doctor blade setup routine. The screen correction position of the doctor blade 16 is shown in Figures 16a and 16b. In the screen correction position according to Figures 16a and 16b, the doctor blade 16 is preferably spaced apart from the printing table 22. As shown in Figures 16a and 16b, in a screen correction position the printing screen 12 can be in contact with the doctor blade 16 and / or be brought into contact with it and / or be kept in contact with it. It is possible that, starting from the position shown in Figs. 15a and 15b, the doctor blade 16 is first moved into the screen correction position, and subsequently the pressure screen 12 is raised and brought into contact with the doctor blade 16. Likewise, starting from the position shown in Figs. 15a and 15b, the doctor blade 16 and the pressure screen 12 can be moved together and / or while maintaining contact into the position shown in Figs. 16a and 16b, in which the doctor blade 16 is positioned in a screen correction position. Following a doctor blade setup routine, as described above with reference to Figures 15a and 15b, a screen setup routine, explained below, can be performed. Such a screen setup routine can begin with the screen correction position, as shown in Figures 16a and 16b, or may have already begun in the screen correction position, as shown in Figures 16a and 16b. The control unit 100 can be configured to perform a sieve setup routine. The control device 100 is preferably designed to detect and / or evaluate an increase in squeegee force, particularly within the framework of a screen setup routine, during an upward movement of the pressure screen 12 by means of the pressure screen movement device 66 exclusively against the squeegee tool 16, in particular in a screen correction position, and in particular without contact with a printing table 22 and / or a printing support and / or at least one screen printing workpiece by the pressure screen 12, via the sensor device 18, in particular the pressure measuring sensors 24. During such an upward movement of the printing screen 12, the doctor blade 16 may already be positioned in a screen correction position. The upward movement of the printing screen 12 onto the doctor blade 16 can establish contact between the two, and further upward movement can cause a screen deformation, particularly an elastic one, as shown in Figs. 16a and 16b. This can result in an increase in the doctor blade force, which can be detected and evaluated. It is also possible that such an upward movement of the pressure screen 12 initially occurs together with the doctor blade 16, from a position shown in Figs. 15a and 15b, optionally while maintaining contact between the pressure screen 12 and the doctor blade 16, until the doctor blade 16 reaches the screen correction position, as shown in Figs. 16a and 16b. However, the pressure screen 12 can be raised further than the doctor blade 16, as also shown in Figs. 16a and 16b, which can result in a screen deformation, particularly an elastic one. This can lead to an increase in the doctor blade force, which can be detected and evaluated. Furthermore, the control device 100 can be configured, particularly within the context of a screen setup routine, to detect and / or evaluate a squeegee force deviation along a longitudinal extent L of the squeegee tool 16 via the sensor device 18 during an upward movement of the pressure screen 12 by means of the pressure screen movement device 66 exclusively on the squeegee tool 16, particularly when it is in a screen correction position, and particularly without contact between the pressure screen 12 and a printing table 22 and / or a printing substrate and / or at least one screen printing workpiece. Such detection and evaluation can be carried out, in particular, in a position of the squeegee tool 16 and the pressure screen 12 shown in Figures 16a and 16b. In this way, it is particularly advantageous to detect and subsequently evaluate squeegee force deviations along the longitudinal extent L of the squeegee tool 16. The control device 100 can be configured, particularly within the context of a screen setup routine, to move the printing screen 12 upwards, specifically without contact between the printing screen 12 and a printing surface and / or at least one screen printing workpiece, against the doctor blade 16, which is located in the screen correction position, until a predetermined rebound height is reached. It is then possible to take a predetermined rebound height into account during a screen setup routine when aligning the printing screen 12, in particular the doctor blade forces and / or deviations along the longitudinal extent L of the doctor blade 16 that occur during this process. Furthermore, the control unit 100 can be configured, particularly within the context of a screen setup routine, to reference the position of the first and second linear drives 67, 68 of the pressure screen movement device 66, especially at a predetermined drop height. The control unit 100 can thus define a specific pressure screen height, for example, a target height or target position of the pressure screen 12, and / or an inclination position of the pressure screen 12 as a reference, which in turn can serve as a reference for subsequent processes. The control device 100 can further be configured to perform an inclination adjustment of the pressure screen 12 as part of a screen setup routine. Such an inclination adjustment is shown schematically in Figs. 17a and 17b with respect to an inclination about a pressure screen longitudinal axis S and in Figs. 18a to 18c with respect to an inclination about a pressure screen transverse axis D. The control unit 100 can be configured, particularly within the framework of a screen setup routine, to adjust the inclination of the pressure screen 12 by means of the linear drive 67, 68 and / or 69, or at least one of the linear drives 67, 68, 69 of the pressure screen movement device 66, particularly starting from a referenced position of the linear drives 67, 68, 69, until the doctor blade force deviation detected by the sensor device 18, in particular the measuring sensors 24, along a longitudinal extent L of the doctor blade tool 16 is zero or lies within a predetermined deviation interval or deviation value range. The linear drives 67, 68 and / or 69 can each be moved incrementally upwards and / or downwards independently of one another.After each procedure or each adjustment increment, a measurement via the measuring sensors 24 and a doctor blade force deviation along a longitudinal extent L of the doctor blade tool 16 can be recorded or evaluated. Furthermore, the control unit 100 can be configured, particularly within the context of a screen setup routine, to move the first and second linear drives 67, 68 of the pressure screen movement device 66 independently of one another, particularly starting from a referenced position of the linear drives 67, 68, until the doctor blade force deviation detected by the sensor device 18, particularly the measuring sensors 24, along a longitudinal extent L of the doctor blade tool 16 is zero or lies within a predetermined deviation interval or deviation value range. Within the context of the screen setup routine, the pressure screen 12 can thus be aligned with the doctor blade tool 16 such that the doctor blade force deviation along the longitudinal extent L of the doctor blade tool 16 is zero or lies within a predetermined deviation interval or deviation value range.This ensures a uniform doctor blade force acting on the printing screen 12 along its longitudinal extent L. Figure 17a shows, for example, a position in which the linear drive 67 has been moved upwards and the linear drive 68 downwards to perform a measurement. The linear drive 69, however, was not moved, as shown in Figure 17b. This movement of the linear drives 67 and 68 can be continued until the desired inclination position of the pressure screen 12 is reached. Such a method, as shown in Fig. 17b, can be carried out in particular in a central position of the doctor blade tool along a doctor blade movement direction R. Such a central position can be positioned in particular between an end position in the doctor blade movement direction shown in Fig. 18b and an initial position in the doctor blade movement direction shown in Fig. 18c. Furthermore, the control unit 100 can be configured, particularly within the context of a screen setup routine, to reference the relative position of the first and second linear drives 67, 68 of the pressure screen movement device 66 relative to each other when the doctor blade force deviation detected by the sensor device 18 along a longitudinal extent L of the doctor blade tool 16 is zero or lies within a predefined deviation interval or deviation value range. The control unit 100 can thus define a pressure screen height, for example, a target height or target position of the pressure screen 12, and / or an inclination position of the pressure screen 12 as a reference, which in turn can serve as a reference for subsequent processes. Figures 18a to 18c show schematic views of the doctor blade device 14 with a pressure table 22 and a pressure screen 12 during an inclination of the pressure screen 12 about a pressure screen transverse axis D within the framework of a screen setup routine, with Figures 18b and 18c showing different doctor blade positions along a doctor blade movement direction R. Referring to Figures 18a to 18c, the control device 100 can be configured, particularly within the context of a sieve setup routine, to move or adjust the doctor blade 16 from a first reference position to a second reference position in the direction of doctor blade movement R by means of the adjusting device 70. For example, in Figure 18b the doctor blade 16 is shown in the first reference position and in Figure 18c in the second reference position. Furthermore, the control device 100 can be configured, in particular within the framework of a sieve setup routine, to move a first and a second linear drive 67, 68 together and a third linear drive 69 independently thereof, or only a third linear drive 69 independently of a first and a second linear drive 67, 68, or only a first and a second linear drive 67, 68 together independently of a third linear drive 69, such that, at a given drop height, the doctor blade force deviation detected by the sensor device 18, in particular the force measuring sensors 24, between a first reference position of the doctor blade tool 16 and a second reference position of the doctor blade tool 16 is zero or lies within a given deviation interval or deviation value range. In the case of such a doctor blade force deviation between a first and second reference position of the doctor blade tool 16, doctor blade force deviations along a longitudinal extent L of the doctor blade tool 16 can be disregarded. Thus, for determining a doctor blade force deviation between a first and second reference position of the doctor blade tool 1, which, in particular, as shown for example in Figs. 18b and 18c, can be spaced apart from each other along a doctor blade movement direction R, a total doctor blade force can be used as a basis, i.e., independent of doctor blade force deviations along a longitudinal extent L of the doctor blade tool 16. Thus, the doctor blade 16 can be lowered vertically in a position shown in Fig. 18b, corresponding to the end of printing, and immersed in the printing screen 12, for example by 0.5 mm. Subsequently, the doctor blade 16 can be lowered vertically in a position shown in Fig. 18c, corresponding to the start of printing, and immersed in the printing screen 12, for example by 0.5 mm. Before the doctor blade 16 is fully immersed, the force is measured by the sensor device 18 in each case to determine the increase in force per unit of travel, or by how much the printing screen 12 must be moved and / or tilted to compensate for a specific force difference between the doctor blade positions shown in Fig. 18b and Fig. 18c.If, in the doctor blade positions shown in Fig. 18c, a force difference measured and / or recorded by the sensor device 18 is greater than a differential tolerance value, the printing screen can be tilted or inclined, particularly iteratively, about the printing screen transverse axis D. This process can be repeated, and the doctor blade forces during immersion into the printing screen 12 in the doctor blade positions according to Fig. 18b and Fig. 18c are measured or recorded until any tolerance limits are no longer exceeded. By such a method, i.e., by adjusting the linear drives 67, 68, 69, the printing screen 12 can thus be advantageously inclined about a transverse axis D of the printing screen. Simultaneously, a comparison of doctor blade forces at different reference positions of the doctor blade tool 16 can be recorded and evaluated at different inclination positions, and an optimal or sufficiently improved inclination position can be set. This ensures a constant doctor blade force acting on the printing screen 12 in the direction of doctor blade movement R, thereby achieving a particularly uniform printing result. By means of at least one or more of the doctor blade and / or screen setup routines described above, the doctor blade tool 16 can first be aligned relative to or parallel with the printing table 22 and then the printing screen 22 can be aligned relative to the doctor blade tool 16 or relative to the lower edge of the doctor blade tool 16. The control unit 100 can further be configured, particularly within the context of a screen setup routine, to reference the position of a first and second linear drive 67, 68 relative to a third linear drive 69 of the pressure screen movement device 66. The control unit 100 can thus define a pressure screen height, for example, a target height or target position of the pressure screen 12, and / or an inclination position of the pressure screen 12 as a reference, which in turn can serve as a reference for subsequent processes, particularly a subsequent printing process. A position of the linear drives 67, 68, 69 shown in Figures 18a to 18c after inclination adjustment can therefore be appropriately referenced. Furthermore, the control device 100 can be configured to compare and / or document a doctor blade force deviation along a longitudinal extent L of the doctor blade tool 16 in a first reference position of the doctor blade tool 16, as shown for example in Fig. 18b, with a doctor blade force deviation along a longitudinal extent L of the doctor blade tool 16 in a second reference position of the doctor blade tool 16, as shown for example in Fig. 18c, and / or to issue a warning message if a tolerance limit is exceeded. Fig. 19a shows a schematic front view of the doctor blade device 16 with a pressure table 22 and a pressure screen 12 during a pressure force determination, particularly within the context of a doctor blade and / or screen setup routine. Fig. 19b shows a schematic side view of the doctor blade device 16 with pressure table 22 and pressure screen 22 during a pressure force determination according to Fig. 19a. A pressure force determination according to Fig. 19a and Fig. 19b may have been preceded by one or more of the doctor blade and / or screen setup routines or screen setup routines, as described above with reference to Figs. 15a to 18c. According to Fig. 19a and Fig. 19b, the pressure force can be determined during contact of the pressure table 22 or a workpiece carrier and / or workpiece positioned on the pressure table 22 by the pressure screen 12 as a result of the force acting via the doctor blade tool 16. A pressure force can in particular be a force acting on the printing table 22 and / or a workpiece carrier located on the printing table 22 and / or on a screen-printed workpiece on the printing table 22 or a workpiece carrier, for example during a printing process. Within the framework of the pressure force determination according to Fig. 19a and Fig. 19b, a squeegee force can be determined when the pressure table 22 or a workpiece carrier and / or workpiece positioned on the pressure table 22 is contacted by the pressure screen 12 as a result of the force acting via the squeegee tool 16. Furthermore, a pressure force acting on the printing table 22 and / or a workpiece carrier and / or a screen printing workpiece can result from the difference between a squeegee force when the squeegee tool 16 acts via the printing screen 12 on the printing table 22 and / or a workpiece carrier and / or a screen printing workpiece on the one hand, as determined, for example, according to Fig. 19a and Fig. 19b, and a squeegee force when the squeegee tool 16 acts on the printing screen 12 and without contact between the printing screen 12 and the printing table 22 or workpiece carrier or screen printing workpiece on the other hand, as determined, for example, according to Fig. 18a to 18c. The control device 100 can therefore be configured, particularly within the framework of a screen setup routine, to determine a pressure force acting on a printing table 22 and / or a workpiece carrier located on a printing table 22 and / or on a screen printing workpiece on the printing table 22 or a workpiece carrier, preferably on the basis of a difference between a squeegee force when the squeegee tool 16 acts via the printing screen 12 on the printing table 22 and / or a workpiece carrier and / or a screen printing workpiece on the one hand, and a squeegee force when the squeegee tool 16 acts on the printing screen 12 without any contact between the printing screen 12 and the printing table 22 or workpiece carrier or screen printing workpiece on the other hand. According to a further embodiment, the control device 100 can be configured to control and / or regulate the height position, orientation, and / or inclination of the printing screen 12 after completion of a printing process and / or before the start of a printing process. In this way, the control device 100 is able to adjust the spatial orientation of the printing screen 12 so that, for example, a constant force is ensured by the doctor blade device 14 or the doctor blade tool 16, or constant forces are applied during a doctor blade operation. The orientation of the printing screen 12 can be adapted to the orientation of the doctor blade tool 16, or control and / or regulation can be carried out taking into account the orientation of the printing screen 12 and the doctor blade tool 16. This allows for a high-quality print image across the entire print layout of a printing screen 12 with further improved reliability. Furthermore, the control device 100 can be configured to control and / or regulate the height position and / or orientation and / or inclination of the pressure screen 12 depending on stored and / or processed measurement data of the sensor device 18 and / or individual force measuring sensors 24 and / or depending on a determined screen tension and / or screen return force and / or application force. Therefore, it is possible to control and / or regulate the spatial orientation of the printing screen 12 by means of measurement data from the sensor device 18, based on the height position, orientation and / or inclination of the printing screen 12. Feedback from the sensor device 18 allows, for example, the spatial orientation of the printing screen 12 to be adjusted so that a doctor blade force on the printing screen 12 is constant across the entire printing layout or the entire surface of the printing screen 12, or—depending on the desired process control or process parameters—to exhibit deviations. Furthermore, the control unit 100 can be configured to force-based control and / or regulation of the height position, orientation, and / or inclination of the printing screen 12 during a printing process. In this way, the control unit 100 is able to flexibly adjust or set the spatial orientation of the printing screen 12 during a printing or squeegeeing process based on measured forces acting, for example, on the doctor blade device 14 or the doctor blade tool 16. This can further improve manufacturing accuracy and flexibility. Furthermore, the control device 100 and / or the positioning device 70 can be configured to hold the doctor blade 16 at a defined height position during the printing process. Maintaining a defined height position ensures a continuous, consistent, and uniform print image. Furthermore, a defined height position can be fixed and / or maintained unchanged during a printing process by means of the adjusting device 70 and / or the control device 100. In this way, a continuous, consistent, and uniform print image across the entire print layout of a printing screen 12 can be ensured with even greater reliability. Furthermore, the control unit 100 and / or the actuating unit 70 can be configured to maintain a defined squeegee force and / or a defined and effective application force during a printing process. This has the advantage that a constant force can be applied with even greater reliability across the entire print layout of the printing screen 12, resulting in a particularly uniform print image. Fluctuations in the squeegee force can thus be compensated for or avoided altogether in a particularly advantageous manner. This ensures exceptionally high print quality. Furthermore, the control unit 100 can be configured to convert, store, and / or process measurement data from continuous and / or recurring acquisitions by the sensor device 18 during movement of the doctor blade device 14 along the doctor blade movement direction R by means of the doctor blade movement device 74, and / or during a printing process. By converting, storing, and / or processing the acquired measurement data into average values, the control unit 100 can advantageously create a suitable database for subsequent control processes, thus ensuring a low overall computational effort. This reduces the need for intensive calculations by the control unit 100 and further promotes a particularly uniform print image. In addition, this method saves storage space for measured values ​​and measurement data. Furthermore, the control unit 100 can be configured to convert measurement data from continuous and / or recurring acquisitions by individual force sensors 24 during movement of the doctor blade device 14 along the doctor blade movement direction R by means of the doctor blade movement device 74 and / or during a printing process into average values ​​and / or to store and / or process them. The information quality can be improved in this way by differentiating data from individual force sensors 24, 26. At the same time, the amount of data to be processed can be reduced, and the processing, storage, and conversion of data or measured values ​​can be accelerated. It can further be provided that the control unit 100 is configured to adjust a doctor blade force and / or application force by means of the adjusting device 70 as a function of the component height and / or as a function of the number of already printed component layers. The height of an existing print build-up or workpiece and / or the number of already printed component layers can thus be advantageously used for further process control and / or regulation by means of the control unit 100. If the existing component height has a significant influence on the printing of further print layers or on the application of the printing material by the printing screen 12, this can be appropriately compensated for by adjusting the doctor blade force and / or application force by means of the adjusting device 70. Furthermore, control unit 100 can be configured to reduce the squeegee force layer by layer and proportionally, starting from an initial squeegee force and / or initial application force, until a boundary layer is reached, and / or upon reaching a boundary layer, to maintain the squeegee force and / or application force unchanged for the printing of further layers. This ensures that screen-printed components have essentially constant layer thicknesses along their entire height. Printing precision can thus be further improved, and the risk of damage to already printed layers reduced. Furthermore, the control unit 100 can be configured to determine a deposition force on the screen-printed workpieces located below the screen 12, in particular as a line print, based on a determined screen return force curve and / or screen tension curve, a determined squeegee blade flexibility, a determined squeegee force over the printing curve in the squeegee movement direction R, a rebound height between the printing screen 12 and a printing table 22 or a component surface, and / or a height of the printing screen 12. Such a determination can advantageously serve to produce high-quality screen-printed components in which a continuous or constant printing layer thickness is ensured from layer to layer. Ensuring constant printing layer thicknesses can lead to improved component precision. Furthermore, the control unit 100 is configured to perform a controlled and / or regulated adjustment of the application force and / or squeegee force and / or squeegee speed along a squeegee movement direction R and / or a rebound height and / or a screen lift function, based on an actual force profile detected by the sensor unit 18 during a screen printing process. Adjusting the squeegee force and / or squeegee speed using a detected actual force profile serves to appropriately adapt the process parameters for an ongoing printing process and / or for at least one subsequent printing process. In this way, the production of high-precision screen-printed components can be carried out with even greater reliability. Any printed layers can have particularly precise thicknesses.Especially when the actual force profile is recorded, it is possible to intervene in the respective printing process in real time and consequently to make settings that allow the screen-printed component to be manufactured with increased precision. It can also be provided that the control unit 100 is designed to perform a controlled and / or regulated adjustment of the screen sheet alignment and / or screen height alignment based on an actual force profile detected by the sensor unit 18 during a screen printing process and / or a detected application force and / or screen closing force and / or screen tension. Thus, the control unit 100 can ensure, at least section by section or section by section, an adjustment of the squeegee force of the squeegee tool 16 on the screen 12 during or after the operation of the device 10, for example, by changing the spatial position of the printing screen 12. This increases manufacturing precision and ensures compensation for inaccuracies from previous printing processes. As a result, screen-printed workpieces can be produced with even greater accuracy. In a method according to the invention for producing three-dimensional screen-printed workpieces, in particular with a device 10 described above for producing three-dimensional screen-printed workpieces, which can in particular be designed as a 3D screen-printing system, the squeegee tool 16 can be placed on a substrate and the squeegee tool 16 can be automatically aligned by its own weight on the substrate. Alternatively or additionally, the squeegee tool 16 can be fixed in its aligned position without screws and / or by frictional locking. In particular, the tilt of the squeegee tool 16 can be adjusted about a tilt axis N. Furthermore, an air bearing can be created for the doctor blade 16, whereby the alignment of the doctor blade 16 is achieved by means of the air bearing. The air bearing ensures frictionless adjustability of the doctor blade 16, which allows the alignment of the doctor blade 16 to be carried out efficiently and with low force. Preferably, the squeegee tool 16 can be held magnetically during alignment, thereby achieving a reliable hold of the squeegee tool 16. Even more advantageously, the doctor blade 16 can be held in place during alignment using a permanent magnet 40. The doctor blade 16 can thus be reliably held independently of an electrical power source. It is also possible for the doctor blade 16 to be fixed in the aligned position by frictional locking. In particular, the doctor blade 16 can be fixed magnetically in the aligned position. Preferably, the doctor blade 16 can be fixed in the aligned position by at least one electromagnet 44. Alternatively or additionally, the doctor blade 16 can be fixed electromagnetically in the aligned position. Furthermore, it may be provided that the doctor blade 16 is force-fitted and / or remains fixed in the aligned position during a doctor blade operation and / or a printing operation. Furthermore, it may be provided that the doctor blade 16 is magnetically fixed and / or remains fixed in the aligned position during a doctor blade operation, in particular by an electromagnet 44. The device 10 can be designed and / or configured in a particularly advantageous manner for the development and / or production of large quantities of solar cells and / or pharmaceuticals. Likewise, a method described above can be implemented for the production of large quantities of solar cells and / or pharmaceuticals. REFERENCE MARK LIST 10 Device 12 Pressure screen 14 Squeegee device 16 Squeegee tool 18 Sensor device 20 Pressure device 22 Pressure table 24 Force measuring sensor 28 Adjustment device 30 Air bearing device 32 Air nozzle 34 Squeegee bearing 36 Adjustment bracket 38 Support structure 40 Permanent magnet 42 Fixing device 44 Electromagnet 46 Slotted guide 48 Fastening system 50 Retaining pin 52 Squeegee blade 54 Squeegee holder 56 Squeegee side surface 58 Adjustment device 60 Coupling section 62 Retaining element 64 Pressure screen device 66 Pressure screen movement device 67 Linear drive 68 Linear drive 69 Linear drive 70 Actuating device 72 Linear drive 74 Squeegee movement device 76 Linear guide 78 Crossbeam 80 Support device 100 Control device D Pressure screen transverse axis L Longitudinal extent N Inclination axis R Squeegee movement direction S Pressure screen longitudinal axis QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature DE 20 2019 101 066 U1

[0002]

Claims

Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, with a printing screen (12) and with a squeegee device (14) for flooding the printing screen (12) with a printing mass and / or for pressing printing mass through the printing screen (12), wherein the squeegee device (14) has at least one squeegee tool (16) and a squeegee bearing (34) for bearing the squeegee tool (16), wherein the squeegee bearing (34) has an adjustment device (28) for aligning the squeegee tool (16) and the adjustment device (28) is designed for automatic alignment of the squeegee tool (16) by means of self-weight-based support of the squeegee tool (16) on a substrate. Device (10) according to claim 1 , characterized by a printing device (20) comprising at least the printing screen (12) and / or the squeegee device (14) for the layer-by-layer production of at least one screen printing workpiece in several screen printing processes and / or for the layer application onto a screen printing workpiece in at least one screen printing process. Device (10) according to claim 2, characterized in that the printing device (20) has at least one printing table (22) for positioning a workpiece carrier and / or a screen printing workpiece below the printing screen (12) and / or below the squeegee device (14). Device (10) according to one of the preceding claims, characterized in that the adjustment device (28) is designed for the automatic alignment of the doctor blade tool (16) with respect to at least two lines of freedom. Device (10) according to one of the preceding claims, characterized in that the adjustment device (28) has an air bearing device (30) which allows alignment of the doctor blade tool (16) in an air bearing operation, in particular automatic alignment and / or alignment by weight-based support of the doctor blade tool (16) on a substrate. Device (10) according to one of the preceding claims, characterized in that the adjustment device (28) has an air bearing device (30) which allows an inclination adjustment of the doctor blade tool (16) about an inclination axis (N) in an air bearing operation. Device (10) according to one of the preceding claims, characterized in that the adjusting device (28) and / or the air bearing device (30) is designed for adjusting the inclination of a tool longitudinal axis extending along the longitudinal extent (L) of the doctor blade tool (16) relative to the pressure screen (12) and / or relative to a pressure table (22) and / or relative to a horizontal plane. Device (10) according to one of the preceding claims, characterized in that the adjustment device (28) and / or the air bearing device (30) is designed for adjusting the inclination of a doctor blade lower edge relative to the printing screen (12) and / or relative to a printing table (22) and / or relative to a horizontal plane. Device (10) according to one of the preceding claims, characterized in that the adjusting device (28) and / or the air bearing device (30) for adjusting the inclination of the doctor blade tool (16) is designed about an inclination axis (N) which extends along a doctor blade movement direction (R) and / or at an angle, in particular perpendicular, to a vertical plane passing through a doctor blade lower edge. Device (10) according to one of claims 5 to 9, characterized in that the air bearing device (30) has at least one air nozzle (32) or several air nozzles (32) for forming a frictionless air bearing of the doctor blade tool (16) in air bearing operation. Device (10) according to one of claims 5 to 10, characterized in that the air bearing device (30) allows a force-fit fixing of the doctor blade tool (16) relative to the inclination axis (N) in a friction bearing operation. Device (10) according to one of claims 5 to 11, characterized in that the doctor blade device (14) has an adjustment bracket (36) and a support structure (38) coupled and / or connectable to the adjustment bracket (36), wherein the relative position of the support structure (38) to the adjustment bracket (36) and / or the relative alignment between the adjustment bracket (36) and the support structure (38) is changeable by means of the air bearing device (30) and / or that the doctor blade tool (16) is arranged or attached to the support structure (38). Device (10) according to one of the preceding claims, characterized in that the doctor blade bearing (34) is designed without pendulum bearings and / or without axle bearings and / or that the doctor blade tool is mounted without pendulum bearings and / or without axle bearings and / or that the doctor blade bearing (34) is formed between the adjustment bracket (48) and the support structure (38) and / or that the air bearing device (30) is formed between the adjustment bracket (36) and the support structure (50) and / or that the air bearing device (30) is designed to form an air bearing between the adjustment bracket (36) and the support structure (38). Device (10) according to claim 12 or 13, characterized in that the air bearing device (30) and / or the at least one air nozzle (32) of the air bearing device (30) is arranged on the adjustment bracket (36) and / or is in operative contact with the support structure (38) and / or can be brought into operative contact with the support structure (38) and / or that the air bearing device (30) allows a relative movement between the adjustment bracket (36) and the support structure (38), in particular in an air bearing operation. Device (10) according to one of the preceding claims, characterized in that the doctor blade device (14) and / or the doctor blade bearing (34) and / or the adjustment device (28) and / or the air bearing device (30) has a permanent magnet (40) or a plurality of permanent magnets (40) for magnetically holding the doctor blade tool (16) and / or the support structure (38). Device (10) according to claim 15, characterized in that the at least one permanent magnet (40) generates a preload of the support structure (38) against the adjustment bracket (36) and / or against the air bearing device (30) arranged on the adjustment bracket (36), in particular along a squeegee movement direction. Device (10) according to claim 15 or 16, characterized in that the at least one permanent magnet (40) is configured with the air bearing device (30) in an air bearing operation for generating and / or maintaining an air bearing between the support structure (38) and the adjustment bracket (36). Device (10) according to one of the preceding claims, characterized in that the doctor blade device (14) and / or the doctor blade bearing (34) and / or the adjustment device (28) has at least one fixing device (42) for fixing an adjusted inclination position of the doctor blade tool (16), in particular an inclination position of the doctor blade tool (16) adjusted via the adjustment device (28) and / or air bearing device (30). Device (10) according to claim 18, characterized in that the fixing device (42) is designed for screwless and / or force-fit fixing of the doctor blade tool (16) in its aligned position. Device (10) according to claim 18 or 19, characterized in that the at least one fixing device (42) is designed to fix the relative position and / or relative alignment between the adjustment bracket (36) and the support structure (38). Device (10) according to one of claims 18 to 20, characterized in that the fixing device (42) has an electromagnet (44) or a plurality of electromagnets (44) for magnetically fixing the doctor blade tool (16) in a working position, in particular in a working position of the doctor blade tool (16) adjusted via the adjusting device (28) and / or air bearing device (30). Device (10) according to claim 21, characterized in that the at least one electromagnet (44) and / or the at least one permanent magnet (40) is arranged on or associated with the adjustment bracket (36) and / or the support structure (38), wherein the at least one electromagnet (44) and / or the at least one permanent magnet (40) is preferably arranged on or associated with the adjustment bracket (36) and the support structure (38) is ferromagnetic. Device (10) according to claim 21 or 22, characterized in that the at least one electromagnet (44) is at least partially surrounded by an air nozzle (32). Device (10) according to one of claims 18 to 23, characterized in that the fixing device (42) has at least one mechanical and / or pneumatic and / or hydraulic clamping device for fixing the doctor blade tool (16) and / or the support structure (38) in a working position, in particular in a working position of the doctor blade tool (16) adjusted via the adjustment device (28) and / or air bearing device (30). Device (10) according to one of the preceding claims, characterized in that the squeegee device (14) and / or the squeegee bearing (34) has at least one slotted guide (46) or slotted structure, wherein the slotted guide (46) or slotted structure is preferably free of play. Device (10) according to one of the preceding claims, characterized in that the doctor blade device (14) has a fastening system (48) for fastening and / or holding the doctor blade tool (16), wherein the fastening system (48) is preferably designed as a holding system and / or as a quick-change holding system. Device (10) according to claim 26, characterized in that the fastening system (48) can be operated without tools and / or has a retaining pin (50) or a plurality of retaining pins (50) for holding or temporarily holding the doctor blade tool (16), in particular for hooking the doctor blade tool (16) onto the retaining pins (50) and / or sliding the doctor blade tool (16) onto the retaining pins (50) and / or for releasing a doctor blade tool (16), and / or that the fastening system (48) has the fixing device (42). Device (10) according to claim 27, characterized in that the at least one retaining pin (50) is guided in a slotted guide (46) or slotted structure of the squeegee bearing (34), in particular guided with play. Device (10) according to one of claims 27 to 28, characterized in that the adjusting bracket (36) has at least one retaining pin (50) and / or that the support structure (38) has at least one slotted guide (46). Device (10) according to one of claims 27 to 29, characterized in that each retaining pin (50) is assigned a slotted guide (46). Device (10) according to one of the preceding claims, characterized in that the doctor blade tool (16) has a doctor blade (52) and / or that a doctor blade (52) of the doctor blade tool (16) is made at least partially of a plastic material and / or of a sheet metal material. Device (10) according to one of the preceding claims, characterized in that the doctor blade tool (16) has a doctor blade holder (54) and / or that the doctor blade (52) is mounted on a doctor blade holder (54) of the doctor blade tool (16) and / or is clamped in or on a doctor blade holder (54). Device (10) according to claim 32, characterized in that the doctor blade (52) has at least one doctor side surface (56) which extends between the side edges of the doctor blade (52), wherein the doctor blade holder (54) defines and / or determines a doctor blade angle formed between the doctor blade side surface (56) and a horizontal plane and / or between the doctor blade side surface (56) and the printing screen (12) and / or between the doctor blade side surface (56) and a printing table (22). Device (10) according to one of the preceding claims, characterized in that the doctor blade tool (16) is designed as an interchangeable tool and / or that by replacing the doctor blade tool (16) the doctor blade angle between a doctor blade side surface (56) and a horizontal plane and / or the printing screen (12) and / or a printing table (22) can be changed. Device (10) according to one of the preceding claims, characterized in that the doctor blade tool (16) has an adjustment device (58) for adjusting the doctor blade angle between a doctor blade side surface (56) and a horizontal plane and / or the printing screen (12) and / or a printing table (22), wherein the doctor blade angle is preferably continuously or in steps, in particular by means of predetermined steps, adjustable by means of the adjustment device (58). Device (10) according to one of claims 32 to 35, characterized in that the doctor blade tool (16) has at least one coupling section (60) formed on the doctor blade holder (54) and / or connected to the doctor blade holder (54) for connection with the doctor blade device (14) by means of the doctor blade bearing (34), in particular the fixing device (42) and / or the air bearing device (30). Device (10) according to claim 36, characterized in that the doctor blade tool (16) has at least one retaining element (62) formed on the doctor blade holder (54) and / or connected to the doctor blade holder (54), wherein the coupling section (60) can be connected to the retaining element (62) in at least two different positions, such that the doctor blade angle is different in the different positions. Device (10) according to one of the preceding claims, characterized in that the adjusting device (28) has at least one spring bearing which can be deflected elastically by an alignment movement of the doctor blade tool (16), and / or that the adjusting device (28) is designed for automatic alignment of the doctor blade tool (16) by spring-supported placement and / or spring-supported pressing of the doctor blade tool (16) onto a substrate. Device (10) according to claim 38, characterized in that the spring bearing applies a spring preload acting on the doctor blade tool (16) and / or is designed to apply a spring preload acting on the doctor blade tool (16), in particular in the case of automatic alignment of the doctor blade tool. Device (10) according to claim 38 or 39, characterized in that the spring bearing is configured to apply, when the doctor blade tool (16) rests on a substrate, a spring force pressing the doctor blade tool (16) onto the substrate and / or a spring force pushing the doctor blade tool (16) away from the substrate. Device (10) according to one of claims 38 to 40, characterized in that the spring bearing is configured to generate a spring force acting on the doctor blade tool (16) in the direction of gravity and / or against the direction of gravity. Device (10) according to one of claims 38 to 41, characterized in that the doctor blade tool (16) is subjected to spring force by the spring bearing, in particular in an unfixed operating position of the doctor blade tool (16), in a lowering direction pointing towards a substrate and / or in a lifting direction pointing away from a substrate. Device (10) according to one of claims 38 to 42, characterized in that the spring bearing has at least one spring or a plurality of springs which act or act between the adjusting bracket (36) and the support structure (38). Device (10) according to one of the preceding claims, characterized in that the doctor blade device (14) has a sensor device (18) for detecting doctor blade forces acting on the doctor blade tool (16). Device (10) according to claim 44, characterized in that the sensor device (18) is designed to detect a squeegee force deviation along a longitudinal extension (L) of the squeegee tool (16). Device (10) according to claims 44 or 45, characterized in that the sensor device (18) has at least one force measuring sensor or at least two force measuring sensors (24, 26), in particular two force measuring sensors (24, 26) connected in parallel. Device (10) according to claim 46, characterized in that the force measuring sensors (24, 26) are arranged spaced apart from each other along a longitudinal extent (L) of the doctor blade tool (16). Device (10) according to claim 46 or 47, characterized in that the force measuring sensors (24, 26) are designed for the simultaneous measurement of absolute doctor blade forces at measuring points spaced apart from each other along the longitudinal extent (L) of the doctor blade tool (16). Device (10) according to one of claims 46 to 48, characterized in that the force measuring sensors (24, 26) are designed to detect relative squeegee force deviations at measuring points spaced apart along the longitudinal extent (L) of the squeegee tool (16). Device (10) according to one of claims 46 to 49, characterized in that, in a top view of the doctor blade device (14), the at least one force measuring sensor (24, 26) or the force measuring sensors (24, 26) are arranged above a contact line of the doctor blade tool (16) and / or are aligned with a contact line of the doctor blade tool (16), or that, in a top view of the doctor blade device (14), the at least one force measuring sensor (24, 26) or the force measuring sensors (24, 26) are arranged offset from a contact line of the doctor blade tool (16). Device (10) according to one of the preceding claims, characterized in that the doctor blade device (14) and / or the adjustment device (28) has an actuating device (70) for moving the doctor blade tool (16) between a raised starting position and at least one lowered operating position and / or lowered and / or laid-down adjustment position on a substrate. Device (10) according to claim 51, characterized in that the actuating device (70) has at least one linear drive (72). Device (10) according to claim 52, characterized in that the linear drive of the actuating device (70) is designed as an electric or electromechanical linear drive (72) and / or as an electric spindle drive and / or as an electric cylinder and / or as a linear actuator. Device (10) according to one of claims 44 to 53, characterized in that the sensor device (18) is arranged in the force flow between the actuating device (70) and the doctor blade tool (16). Device (10) according to one of claims 44 to 54, characterized in that the sensor device (18) is arranged in the force flow between the actuating device (70) and the squeegee bearing (34) and / or in the force flow between the actuating device (70) and the air bearing device (30) and / or in the force flow between the actuating device (70) and the adjustment bracket (36). Device (10) according to one of claims 44 to 55, characterized in that the sensor device (18), in particular the force measuring sensors (24, 26) of the sensor device (18), is fixedly arranged between the adjustment bracket (36) and a sensor holder connected to the actuating device (70). Device (10) according to one of the preceding claims, characterized by a doctor blade movement device (74) for moving the doctor blade device (14) and / or the doctor blade tool (16) along a doctor blade movement direction (R) extending in a horizontal direction. Device (10) according to claim 57, characterized in that the doctor blade movement device (74) has at least one linear drive for moving the doctor blade device (14) and / or the doctor blade tool (16). Device (10) according to claim 57 or 58, characterized in that the squeegee movement device (74) has a portal system with linear guides (76) and / or a crossbeam (78) and / or support devices (80) for supporting the crossbeam on the linear guides (76). Device (10) according to claim 59, characterized in that the linear guides (76) run along the direction of squeegee movement (R) and / or that the cross member (78) runs in a top view between the linear guides (76) and / or transversely to the linear guides (76). Device (10) according to one of claims 59 or 60, characterized in that the squeegee device (14) and / or the adjusting device (70) of the squeegee device (14) is attached to the cross member (78) of the portal system. Device (10) according to one of claims 59 to 61, characterized in that the squeegee device (14) is arranged immovably along a longitudinal extension (L) of the cross member (78). Device (10) according to one of claims 59 to 62, characterized in that the at least one linear drive (72) of the squeegee movement device (74) is coupled to the crossbeam (78) of the portal system. Device according to one of the preceding claims, characterized by a pressure sieve device (64), wherein the pressure sieve device (64) has a pressure sieve movement device (66) for moving the pressure sieve between a raised test position and at least one lowered pressure position. Device (10) according to claim 64, characterized in that the pressure screen movement device (66) has at least one linear drive (67, 68, 69) or a plurality of linear drives (67, 68, 69). Device (10) according to claim 64 or 65, characterized in that the pressure screen movement device (66) has two linear drives (67, 68) spaced apart from each other along the longitudinal extent (L) of the doctor blade tool (16). Device (10) according to one of claims 64 to 66, characterized in that the pressure screen movement device (66) has a first linear drive (67) and a second linear drive (68), wherein the linear drives (67, 68) are arranged on opposite transverse sides of the pressure screen or assigned to opposite transverse sides of the pressure screen and / or are separated from each other along the longitudinal extent (L) of the doctor blade tool (16) and / or are spaced apart from each other transversely, in particular perpendicularly, to the direction of doctor blade movement (R). Device (10) according to one of claims 64 to 67, characterized in that the pressure screen is pivotable or tiltable relative to the doctor blade tool (16) and / or relative to a pressure table (22) and / or relative to a horizontal plane by means of the pressure screen movement device (66). Device (10) according to one of claims 64 to 68, characterized in that the pressure screen is pivotable or tiltable by means of the pressure screen movement device (66) about a pressure screen transverse axis (D) extending perpendicular to the connecting line between the two linear drives (67, 68). Device (10) according to one of claims 64 to 69, characterized in that the pressure screen movement device (66) has a third linear drive (69), wherein the third linear drive (69) is arranged on or associated with a longitudinal side of the pressure screen and / or is spaced apart in the direction of squeegee movement (R) and / or transversely, in particular perpendicularly, to the longitudinal extent (L) of the squeegee tool (16) from the first and second linear drives (67, 68). Device (10) according to one of claims 64 to 70, characterized in that the pressure screen is pivotable or tiltable by means of the pressure screen movement device (66) about a pressure screen longitudinal axis (S) extending transversely, in particular perpendicularly, to the pressure screen transverse axis (D) and / or parallel to the longitudinal extent (L) of the doctor blade tool (16). Device (10) according to one of the preceding claims, characterized by a control device (100) for controlling and / or regulating the adjustment device (28) and / or the positioning device (70) and / or the pressure screen movement device (66) and / or the fixing device (42) and / or the doctor blade movement device (74) and / or the air bearing device (30) and / or for processing and / or evaluating and / or storing and / or comparing sensor data from the sensor device (18). Device (10) according to claim 72, characterized in that the control device (100) is designed to detect and / or evaluate a squeegee force when force is applied by the squeegee tool (16) directly to a printing table (22) and / or in a screen-free arrangement via the sensor device (18), in particular when the squeegee tool (16) is fixed. Device (10) according to claim 72 or 73, characterized in that the control device (100) is designed to detect and / or evaluate a squeegee force via the sensor device (18) when force is applied by the squeegee tool (16) to the printing screen (12) in an operating position in which the printing screen (12) rests on the printing table (22), particularly when the squeegee tool (16) is fixed. Device (10) according to one of claims 72 to 74, characterized in that the control device (100) is designed to detect and / or evaluate a squeegee force via the sensor device (18) when force is applied by the printing screen (12) to the squeegee tool (16), without contact between the printing screen (12) and a printing table (22) and / or a printing base and / or at least one screen printing workpiece, in particular when the squeegee tool (16) is fixed. Device (10) according to one of claims 72 to 75, characterized in that the control device (100) is designed to detect and / or evaluate a squeegee force via the sensor device (18) when force is applied by the squeegee tool (16) to the printing screen (12) and when contact is made by the printing screen (12) with a printing table (22) and / or a printing base and / or at least one screen printing workpiece by the printing screen (12), in particular when the printing screen (12) is elastically deformed. Device (10) according to one of claims 72 to 76, characterized in that the control device (100) is designed to detect and / or evaluate an increase or decrease in squeegee force via the sensor device (18) during a lowering movement of the squeegee tool (16) by means of the actuating device (70). Device (10) according to one of claims 72 to 77, characterized in that the control device (100) is designed to detect and / or evaluate an increase in squeegee force via the sensor device (18) during a lowering movement of the squeegee tool (16) by means of the actuating device (70) exclusively onto the printing screen (12), in particular free from contact with a printing table (22) and / or a printing support and / or at least a screen printing workpiece by the printing screen (12). Device (10) according to one of claims 72 to 78, characterized in that the control device (100) is designed to detect and / or evaluate an increase in squeegee force via the sensor device (18) during a lowering movement of the doctor blade tool (16) by means of the actuating device (70) on the pressure screen (12), in an operating position in which the pressure screen (12) rests on a pressure table (22). Device (10) according to one of claims 72 to 79, characterized in that the control device (100) is designed to detect and / or evaluate an increase in squeegee force via the sensor device (18) during a lowering movement of the doctor blade tool (16) by means of the actuating device (70) onto a printing table (22) and / or onto a printing support, in particular in a screen-free arrangement. Device (10) according to one of claims 72 to 80, characterized in that the control device (100) is configured to terminate a lowering movement by the actuating device (70) when a change in the doctor blade force is detected by means of the sensor device (18) during the lowering of the doctor blade tool (16), or to terminate the lowering movement by the actuating device (70) after a predetermined lowering stroke. Device (10) according to one of claims 72 to 81, characterized in that the control device (100) is configured to automatically or semi-automatically reference a squeegee height when a change in squeegee force is detected by means of the sensor device (18) during the lowering of the squeegee tool (16). Device (10) according to one of claims 72 to 82, characterized in that the control device (100) is configured to detect and / or evaluate a squeegee force deviation along a longitudinal extension (L) of the squeegee tool (16) via the sensor device (18) during a lowering movement of the squeegee tool (16) by means of the actuating device (70). Device (10) according to one of claims 72 to 83, characterized in that the control device (100) is designed to adjust the doctor blade device (14) to a doctor blade change position, in particular during a doctor blade setup routine, by means of the adjusting device (70). Device (10) according to one of claims 72 to 84, characterized in that the control device (100) is designed to detect and / or recognize, in particular during a doctor blade setup routine, whether a doctor blade tool (16) is attached to or connected with the doctor blade bearing (34) and / or the doctor blade device (14), in particular via a doctor blade force detected by means of the sensor device (18) and / or via a dead weight of the doctor blade tool (16) detected by means of the sensor device (18). Device (10) according to one of claims 72 to 85, characterized in that the control device (100) is designed to activate or keep activated the air bearing device (30), in particular the at least one air nozzle (32), and to deactivate and / or leave inactive the at least one electromagnet (44), particularly during a doctor blade setup routine, during a lowering movement of the doctor blade tool (16) by means of the positioning device (70). Device (10) according to one of claims 72 to 86, characterized in that the control device (100) is configured, in particular during a doctor blade setup routine, to terminate a lowering movement by the actuating device (70) when a force reference value is detected via the sensor device (18) and / or to continue a lowering movement by the actuating device (70) by a predetermined lowering stroke and / or to terminate it after a predetermined lowering stroke. Device (10) according to one of claims 72 to 87, characterized in that the control device (100) is configured, in particular during a doctor blade setup routine, to terminate a lowering movement by the actuating device (70) and / or to continue a lowering movement by the actuating device (70) by a predetermined lowering stroke and / or to terminate it after a predetermined lowering stroke when a doctor blade force deviation is detected via the sensor device (18) and is within a reference interval along a longitudinal extension (L) of the doctor blade tool (16). Device (10) according to one of claims 72 to 88, characterized in that the control device (100) is designed to activate and / or leave activated the at least one electromagnet (44) and / or to deactivate the air bearing device (30), in particular the at least one air nozzle (32), after completion of a lowering movement by the actuating device (70). Device (10) according to one of claims 72 to 89, characterized in that the control device (100) is configured to reference the position of the doctor blade tool (16), in particular during a doctor blade setup routine, after completion of a lowering movement by the actuating device (70) and / or activation of the at least one electromagnet (44) and / or deactivation of the air bearing device (30). Device (10) according to claim 90, characterized in that the control device (100) is configured to change the position of the doctor blade tool (16) relative to the referenced position by means of a lowering or raising movement, in particular during and / or for a doctor blade operation, by means of the adjusting device (70), in particular to set a, preferably predetermined, target doctor blade force during a doctor blade operation. Device (10) according to one of claims 72 to 91, characterized in that the control device (100) is designed to move the doctor blade tool (16) in an upward movement, in particular to a screen correction position, after activation of the at least one electromagnet (44), in particular during a doctor blade setup routine, by means of the positioning device (70). Device (10) according to one of claims 72 to 92, characterized in that the control device (100) is designed to generate, in particular within the framework of a screen setup routine, an effective contact with force exerted by the squeegee tool (16) on the pressure screen (12) between the squeegee tool (16), which is in a screen correction position and / or aligned by its own weight and / or aligned by spring-supported placement and / or spring-supported pressing of the squeegee tool on a substrate, and the pressure screen (12), which is in a screen correction position, in particular without contact with a printing table (22) and / or a printing surface and / or at least one screen printing workpiece by the pressure screen (12) and / or by the squeegee tool (16). Device (10) according to claim 93, characterized in that the control device (100) is configured to detect and / or evaluate an increase in squeegee force via the sensor device (18) when generating an effective contact between the squeegee tool (16) and the printing screen (12). Device (10) according to one of claims 72 to 94, characterized in that the control device (100) is designed to detect and / or evaluate an increase in squeegee force via the sensor device (18), in particular during an upward movement of the printing screen by means of the printing screen movement device (66) exclusively on the squeegee tool (16), in particular free from contact with a printing table (22) and / or a printing base and / or at least one screen printing workpiece by the printing screen (12). Device (10) according to one of claims 72 to 95, characterized in that the control device (100) is configured, in particular within the framework of a screen setup routine, to raise and / or position the printing screen (12) in a screen correction position, in particular free from contact with a printing table (22) and / or a printing base and / or at least one screen printing workpiece by the printing screen (12), and during a downward movement of the squeegee tool (16), in particular aligned and / or self-weight-based aligned and / or by spring-supported placement and / or spring-supported pressing of the squeegee tool onto a substrate, to detect and / or evaluate an increase in squeegee force via the sensor device (18),in particular to detect and / or evaluate an increase in squeegee force free from contact between a printing table (22) and / or a printing substrate and / or at least one screen printing workpiece by the printing screen (12) and / or by the squeegee tool (16). Device (10) according to one of claims 72 to 96, characterized in that the control device (100) is configured to detect and / or evaluate a squeegee force deviation along a longitudinal extension (L) of the squeegee tool (16) via the sensor device (18), particularly during an upward movement of the printing screen via the pressure screen movement device (66) exclusively on the squeegee tool (16), in particular during a screen correction position, and in particular during an upward movement of the printing screen via the pressure screen movement device (66), in particular during a squeegee tool movement device (16), and in particular during a squeegee force deviation along a longitudinal extension (L) of the squeegee tool (16) without contact with a printing table (22) and / or a printing substrate and / or at least one screen printing workpiece by the printing screen (12) and / or by the squeegee tool (16). Device (10) according to one of claims 72 to 97, characterized in that the control device (100) is configured, in particular within the framework of a screen setup routine, to raise and / or position the printing screen (12) in a screen correction position, in particular free from contact with a printing table (22) and / or a printing base and / or at least one screen printing workpiece by the printing screen (12), and during a downward movement of the squeegee tool (16), in particular aligned and / or self-weight-based aligned and / or by spring-assisted placement and / or spring-assisted pressing of the squeegee tool onto a substrate, via the sensor device (18) to detect and / or evaluate a squeegee force deviation along a longitudinal extent (L) of the squeegee tool (16) that takes place exclusively on the printing screen (12),in particular a squeegee force deviation along a longitudinal extension (L) of the squeegee tool (16) free from contact with a printing table (22) and / or a printing substrate and / or at least one screen printing workpiece by the printing screen (12) and / or by the squeegee tool (16). Device (10) according to one of claims 72 to 98, characterized in that the control device (100) is configured, in particular within the framework of a screen setup routine, to move the printing screen in an upward movement, in particular free from contact with a printing table (22) and / or a printing support and / or at least a screen printing workpiece by the printing screen (12), against the squeegee tool (16), in particular located in the screen correction position, and / or to raise the printing screen (12) more than the squeegee tool (16) until a predetermined rebound height is reached and / or a minimum force effect of the squeegee tool (16) on the printing screen (12) is reached. Device (10) according to one of claims 72 to 99, characterized in that the control device (100) is designed to raise the printing screen (12) in an upward movement, in particular without contact with a printing table (22) and / or a printing base and / or at least a screen printing workpiece by the printing screen (12), to a screen correction position and / or until a predetermined jump height is reached. Device (10) according to claim 100, characterized in that the control device (100) is configured to move the doctor blade tool (16), in particular within the framework of a screen setup routine, in a downward movement towards the pressure screen (12), in particular which is in a screen correction position, in particular until a minimum force effect of the doctor blade tool (16) on the pressure screen (12) is reached. Device (10) according to one of claims 72 to 101, characterized in that the control device (100) is designed, in particular within the framework of a sieve setup routine, to tilt the pressure sieve (12) about at least one axis depending on detected and / or evaluated data of the sensor device (18) and / or detected and / or evaluated increases and / or deviations in squeegee force along a longitudinal extension (L) of the squeegee tool (16), in particular by means of the pressure sieve movement device (66) about a pressure sieve transverse axis (D) and / or pressure sieve longitudinal axis (S). Device (10) according to one of claims 72 to 102, characterized in that the control device (100) is configured to reference the position of the first and second linear drives (67, 68) of the pressure screen movement device (66), particularly within the framework of a sieve setup routine, especially at a predetermined drop height. Device (10) according to claim 103, characterized in that the control device (100) is configured to move the first and second linear drives (67, 68) of the pressure screen movement device (66) independently of each other from the referenced position, particularly within the framework of a screen setup routine, until the doctor blade force deviation detected via the sensor device (18) along a longitudinal extension (L) of the doctor blade tool (16) is equal to zero or lies within a predetermined deviation interval. Device (10) according to one of claims 72 to 104, characterized in that the control device (100) is configured to reference the relative position of the first and second linear drives (67, 68) of the pressure screen movement device (66) relative to each other, particularly within the framework of a screen setup routine, when the doctor blade force deviation detected via the sensor device (18) along a longitudinal extension (L) of the doctor blade tool (16) is zero or lies within a predetermined deviation interval. Device (10) according to one of claims 72 to 105, characterized in that the control device (100) is configured to move or adjust the doctor blade tool (16) from a first reference position to a second reference position in the direction of doctor blade movement (R) by means of the adjusting device (70), in particular while maintaining contact with the pressure screen (12) or free from contact with the pressure screen (12). Device (10) according to one of claims 72 to 106, characterized in that the control device (100) is configured to move, in particular within the framework of a sieve device routine, a first and a second linear drive (67, 68) together and a third linear drive (69) independently, such that at a predetermined drop height the squeegee force deviation detected by the sensor device (18) between the first reference position and the second reference position is zero or lies within a predetermined deviation interval. Device (10) according to one of claims 72 to 107, characterized in that the control device (100) is configured to reference, in particular within the framework of a sieve device routine, the position of a first and second linear drive (67, 68) relative to a third linear drive (69) of the pressure sieve movement device (66). Device (10) according to one of claims 72 to 108, characterized in that the control device (100) and / or the actuating device (70) is configured to hold the doctor blade tool (16) at a fixed height position during the execution of a printing process and / or to fix and / or maintain a fixed height position during the execution of a printing process by means of the actuating device (70) and / or the control device (100). Device (10) according to one of claims 72 to 109, characterized in that the control device (100) is designed to control and / or regulate the height position of the doctor blade tool (16) by force during the execution of a printing process. Device (10) according to one of claims 72 to 110, characterized in that the control device (100) and / or the actuating device (70) is designed to maintain a defined doctor blade force and / or a defined and effective application force during the execution of a printing process. Device (10) according to one of claims 72 to 111, characterized in that the control device (100) is configured to convert measurement data from continuous and / or recurring detections by the sensor device (18) during a movement of the squeegee device (14) along the squeegee movement direction (R) by means of the squeegee movement device (74) and / or during a printing process into average values ​​and / or to store and / or process them. Device (10) according to one of claims 72 to 112, characterized in that the control device (100) is configured to convert measurement data from continuous and / or recurring acquisitions of individual force measuring sensors (24, 26) during a movement of the squeegee device (16) along the squeegee movement direction (R) by means of the squeegee movement device (74) and / or during a printing process into average values ​​and / or to store and / or process them. Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, with a printing screen (12) and with a squeegee device (14) for flooding the printing screen (12) with a printing compound and / or for pressing printing compound through the printing screen (12), wherein the squeegee device (14) has at least one squeegee tool (16) and a squeegee bearing (34) for bearing the squeegee tool (16), wherein the squeegee bearing (34) has an adjustment device (28) for aligning the squeegee tool (16), wherein the adjustment device (28) has at least one spring bearing which is spring-elastic deflectable by an alignment movement of the squeegee tool (16), and wherein the adjustment device (28) is designed for automatic alignment of the squeegee tool (16) by spring-supported placement and / or spring-supported pressing of the squeegee tool (16) onto a substrate. Device (10) according to claim 114, characterized in that the spring bearing applies a spring preload acting on the doctor blade tool (16) and / or is designed to apply a spring preload acting on the doctor blade tool (16), in particular in the case of automatic alignment of the doctor blade tool. Device (10) according to claim 114 or 115, characterized in that the spring bearing is configured to apply, when the doctor blade tool (16) rests on a substrate, a spring force pressing the doctor blade tool (16) onto the substrate and / or a spring force pushing the doctor blade tool (16) away from the substrate. Device (10) according to one of claims 114 to 116, characterized in that the spring bearing is configured to generate a spring force acting on the doctor blade (16) in the direction of gravity and / or against the direction of gravity. Device (10) according to one of claims 114 to 117, characterized in that the doctor blade tool (16) is subjected to spring force by the spring bearing, in particular in an unfixed operating position of the doctor blade tool (16), in a lowering direction pointing towards a substrate and / or in a lifting direction pointing away from a substrate. Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, with a printing screen (12) and with a squeegee device (14) for flooding the printing screen (12) with a printing compound and / or for pressing printing compound through the printing screen (12), wherein the squeegee device (14) has at least one squeegee tool (16) and a squeegee bearing (34) for bearing the squeegee tool (16), wherein the squeegee bearing (34) has an adjustment device (28) for aligning the squeegee tool (16), wherein the adjustment device (28) is designed for automatically aligning the squeegee tool (16), and wherein the squeegee device (14) has a fixing device (42) for screwless and / or force-fit fixing of the squeegee tool (16) in its aligned position. Device (10) for producing three-dimensional screen-printed workpieces, in particular a 3D screen printing system, comprising a printing screen (12), a squeegee device (14) having a squeegee tool for flooding the printing screen (12) with a printing mass and / or for pressing printing mass through the printing screen (12), and a control device (100) for executing a squeegee and / or screen setup routine, wherein the control device (100) is configured to establish, within the framework of a screen setup routine, an effective contact with force exerted by the squeegee tool (16) into the printing screen (12) between the squeegee tool (16), which is in a screen correction position and is preferably aligned based on its own weight and / or aligned by spring-assisted placement and / or spring-assisted pressing of the squeegee tool onto a substrate, and the printing screen (12), which is in a screen correction position.to produce free from contact between a printing table (22) and / or a printing base and / or at least one screen printing workpiece by the printing screen (12) and / or by the squeegee tool (16). Squeegee device (14), in particular for a device (10) for producing three-dimensional screen-printed workpieces according to one of the preceding claims and / or for a 3D screen printing system, with at least one squeegee tool (16) for flooding a printing screen (12) with a printing mass and / or for pressing printing mass through a printing screen (12) and with a squeegee bearing (34) for bearing the squeegee tool (16), wherein the squeegee bearing (34) has an adjustment device (28) for aligning the squeegee tool (16), wherein the adjustment device (28) is designed for automatic alignment of the squeegee tool (16) by means of self-weight-based support of the squeegee tool (16) on a substrate. Squeegee device (14), in particular for a device (10) for producing three-dimensional screen-printed workpieces according to one of claims 1 to 120 and / or for a 3D screen printing system, comprising a squeegee device (14) for flooding a printing screen (12) with a printing compound and / or for pressing printing compound through a printing screen (12) and comprising a squeegee bearing (34) for supporting the squeegee tool (16), wherein the squeegee bearing (34) comprises an adjustment device (28) for aligning the squeegee tool (16), wherein the adjustment device (28) comprises at least one spring bearing which is spring-elastic deflectable by an alignment movement of the squeegee tool (16), and wherein the adjustment device (28) is designed for automatic alignment of the squeegee tool (16) by spring-supported placement and / or spring-supported pressing of the squeegee tool (16) onto a substrate. Squeegee device (14), in particular for a device (10) for producing three-dimensional screen-printed workpieces according to any one of claims 1 to 120 and / or for a 3D screen printing system, comprising at least one squeegee tool (16) for flooding a printing screen (12) with a printing compound and / or for pressing printing compound through a printing screen (12) and comprising a squeegee bearing (34) for supporting the squeegee tool (16), wherein the squeegee bearing (34) comprises an adjustment device (28) for aligning the squeegee tool (16), wherein the adjustment device (28) is designed for automatically aligning the squeegee tool (16), and wherein the squeegee device (14) comprises a fixing device (42) for screwless and / or friction-fit fixing of the squeegee tool (16) in its aligned position Squeegee device (14) according to one of claims 121 to 123, characterized in that the adjustment device (28) has an air bearing device (30) for aligning the squeegee tool (16), wherein the adjustment device preferably allows an inclination adjustment of the squeegee tool (16) by means of the air bearing device (30) about an inclination axis (N). Squeegee device (14) according to claim 124, characterized in that the air bearing device (30) has at least one air nozzle (32). Adjustment device (28) for a device (10) for the production of three-dimensional screen printing workpieces according to one of claims 1 to 120 and / or for a 3D screen printing system and / or for a squeegee device (14) according to one of claims 121 to 125 for aligning a squeegee tool (16).

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