Device for producing 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 device (14) having a printing screen (16) for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes and with a dosing device (18) for the dosed dispensing of a pasty printing compound (22) onto the printing screen (16), wherein the dosing device (18) has at least one container (20) for storing the pasty printing compound, a dispensing device (24) for dispensing the printing compound (22) onto the printing screen (16) and a feed line (26) running between the container (20) and the dispensing device (24) for feeding the printing compound (22) from the container (20) to the dispensing device (24).

Description

The present invention relates to an apparatus for producing three-dimensional screen-printed workpieces.In the production of workpieces by way of three-dimensional screen printing, there is a requirement to apply a printing compound to the respective printing screen at regular intervals. The printing mass applied or distributed on the printing screen can subsequently be pressed through the printing screen by means of a printing squeegee. By such a printing operation, a printing layer is produced on the respective printing substrate or a further printing layer is produced on the already partially constructed workpiece.During operation of a device for producing three-dimensional screen-printed workpieces, the printing compound to be used in each case can be applied to the printing screen in particular manually by the respective system operator. This is handling-intensive and therefore requires a relatively high amount of personnel. The accessibility of the pressure screen is also limited. At the same time, such manual application can lead to uneven printing results or uneven printing layers as well as to undesired contaminants.Against the background set forth above, the object of the present invention was to specify an apparatus for producing three-dimensional screen-printed workpieces which ensures simplified operability and increased flexibility of use with simultaneously improved production accuracy.This object has been achieved by the subject matter of claim 1 as well as by the subject matter of claims 82 and 83. Advantageous embodiments are the subject matter of the dependent claims and are explained below.According to the invention, a device for producing three-dimensional screen-printed workpieces is provided. The device is in particular a 3D screen printing system, preferably an automated 3D screen printing system.The device according to the invention has a printing device having a printing screen for the layer-by-layer production of at least one screen printing workpiece in a plurality of printing processes and a metering device for the metered dispensing of a pasty printing composition onto the printing screen. The metering device is equipped with at least one container for storing the pasty printing mass, a dispensing device for dispensing the printing mass onto the printing screen, and a feed line running between the container and the dispensing device for feeding the printing mass from the container to the dispensing device.By means of a metering device provided according to the invention, a precise dispensing of printing mass onto the respective printing screen can be realized with only little handling complexity. In particular, a high degree of metering precision can be ensured by means of the metering device, so that the quantity of discharged printing mass is set and / or controlled relatively accurately. At the same time, the arrangement of the dispensing device, the container for storing the pasty printing compound and the feed line for feeding the printing compound from the container to the dispensing device allows an overall space-saving arrangement and / or an arrangement adapted to the respective system construction.In particular above the respective pressure screen and / or within the pressure device, spatial and / or geometric restrictions can be present, which, however, can be met in a particularly advantageous manner by dividing the metering device into a dispensing device, a container and a feed line.Such an arrangement can be positioned and mounted in a particularly advantageous manner even in the case of locally very limited space conditions. The overall construction of the device can in this way be influenced only to a small extent by the arrangement of the metering device, and complicated and complicated constructions can be avoided.Overall, a configuration according to the invention allows a high level of productivity and operational reliability to be ensured. In addition, a metering device provided according to the invention makes it possible to meet stringent requirements for the purity conditions of the products produced in each case, since the risk of contamination of the printing composition to be used in each case by a system operator can be kept low or completely avoided.In the present case, three-dimensional screen printing can be understood in a particularly preferred manner to mean an additive manufacturing method in which a powder-based suspension is transferred by means of a squeegee through a solid printing mask or a printing screen to a substrate, such as, for example, to a printing table or to a workpiece carrier or a previously applied layer of a screen printing workpiece and dried. This procedure can be repeated several times until the respectively desired component height or component shape is achieved. In particular, in the case of three-dimensional screen printing, at least two or at least three printing layers can be produced on top of one another. In a final process step, the component produced in this way can be sintered. This can result in a screen printed workpiece.In the present case, three-dimensional screen printing can likewise be understood in a particularly preferred manner as an additive manufacturing method in which a powder-based suspension is transferred and dried by means of a squeegee through a solid printing mask or a printing screen onto a substrate, wherein the respectively desired component height or component shape is already achieved by a single printing. In a final process step, a component produced in this way can be sintered and a screen-printed workpiece can be produced. Insofar as a plurality of printing processes is mentioned here, a printing process may already be sufficient and suitable instead.Screen-printed workpiece can be understood in the present case in a preferred manner to mean a workpiece or a three-dimensional printed product which is to be subjected to or has been subjected to a sintering step. This relates in particular to 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 particularly suitable for this purpose.Printed products made of plastic materials can be 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.Screen-printed workpiece can also be understood in the present case as a workpiece or a three-dimensional printed product which has been produced free of a sintering step or can be finished or is finished free of a sintering step. Consequently, a final curing of printing layers can also take place free of sintering steps. The curing of a screen printed workpiece can advantageously also be effected by UV curing and / or by a polymerization reaction and / or by drying, in particular by convection drying. Such curing can be preferably carried out in particular when a final curing of printing layers is to take place free of sintering steps.Screen-printed workpiece can be understood here additionally or alternatively to mean a workpiece or a three-dimensional printed product that has been produced completely by three-dimensional screen printing.Screen-printed workpiece can in the present case also be understood to mean a workpiece or a three-dimensional printed product which has been produced at least partially or in sections by three-dimensional screen printing. A screen-printed workpiece can therefore be produced by applying at least one printing layer or else a plurality of printing layers to a substrate provided in some other way, wherein the substrate forms part of the finished workpiece.A screen-printed workpiece in the sense of the present invention can furthermore be a pharmaceutical product and / or a biological product. Such screen printed workpieces can be manufactured, among other things, from pharmaceutical powder materials and / or powder mixtures and / or granules and / or from biological materials. In particular, pharmaceutical products and / or biological products can be finished free of sintering steps or sufficiently cured for the respective application.Screen printed workpieces produced from pharmaceutical powder materials and / or powder mixtures and / or granules can have drugs, active ingredients, auxiliaries, 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 clean room conditions.In particular, the device can be designed and / or set up for production under clean room conditions according to clean room classes A, B, C and / or D according to EU-GMP.Further preferably, a device according to the invention for producing three-dimensional screen printed workpieces can be designed and / or configured for use in medical technology, in optics and / or laser technology, in air and space technology, in semiconductor technology, in biotechnology and / or in medical and / or in pharmacological research.The device according to the invention for producing three-dimensional screen-printed workpieces can likewise be designed and / or configured for use and / or use as medical and / or pharmaceutical products, implants and / or sterile products and / or medicaments and / or for use and / or use as tablets for active ingredient administration.According to the present invention, a screen-printed workpiece can be a workpiece which is built up on a workpiece carrier by three-dimensional screen printing in one or more printing processes. The screen-printed workpiece is in particular a workpiece which, after completion of the printing operation and / or after completion of a sintering operation following the printing operation, can be detached again from the respective workpiece carrier, in particular can be detached in a non-destructive manner.Between any printing processes for a screen printing workpiece, the respective workpiece carrier can be detached from the printing table or from the printing table plate or can be detached therefrom. The individual layers of a screen-printed workpiece-in the case of a multilayer construction-can be dried between two successive printing processes in a position remote from the printing table or from the printing table plate.According to a preferred embodiment, the container can be arranged outside a printing region of the printing device and / or outside a printing table of the printing device. Additionally or alternatively, the container can be spaced apart in the horizontal direction relative to the printing screen and / or printing table or arranged below or above a printing table of the printing device in the vertical direction. The installation space present in the device can thereby be used particularly advantageously and no or only slight structural limitations result from the use of the dosing device. In this case, a particularly ergonomic arrangement can be created in particular by an arrangement outside the printing region and / or the printing table and vertically at a height above the printing table and / or the printing screen.According to a further preferred embodiment, during the dispensing of the printing composition, the container can be arranged and / or remain spaced apart from a printing region of the printing device and / or outside a printing table of the printing device and / or in the horizontal direction relative to the printing screen and / or printing table or arranged and / or remain below or above a printing table of the printing device in the vertical direction. This can be achieved constructively with only a low outlay and nevertheless ensures good accessibility of the container for the respective operating personnel.According to a still further preferred embodiment, the container can be arranged and / or remain stationary during the dispensing of the printing mass. This enables an overall robust and stable device construction and a high level of operational reliability.According to a still further preferred embodiment, the container can be designed as a bucket, in particular with a cylindrically or conically encircling side wall and / or with an opening formed and / or closable on the top side and / or with a printing mass outlet formed on the bottom side. Such a container can be provided with only little effort, can be easily refilled or filled and can be formed with a high receiving volume. In addition, a bottom-side printing mass outlet enables a safe and simple conveying of printing mass out of the container. A conically encircling side wall can reduce the risk of larger residues in the container.According to an even more preferred embodiment, the container or a container designed as a bucket can have a holding volume of at least 1 dm 3, preferably of at least 3 dm 3, more preferably of at least 4 dm 3, more preferably of at least 5 dm 3, more preferably of at least 7 dm 3, more preferably of at least 9 dm 3, more preferably of at least 10 dm 3, more preferably of at least 15 dm 3, more preferably of at least 20 dm 3, even more preferably of at least 25 dm 3 and even more preferably of at least 35 dm3. With such a receiving volume, a relatively large amount of printing mass can be provided and applied in a metered manner for the printing of workpieces onto the respective printing screen. Frequent replacement or equipment costs for replacing a emptied container with a filled container can thus be avoided.According to a still further preferred embodiment, the container or container designed as a bucket can have a holding volume of up to 5 dm 3, preferably of up to 7 dm 3, further preferably of up to 9 dm 3, further preferably of up to 10 dm 3, further preferably of up to 15 dm 3, further preferably of up to 20 dm 3, further preferably of up to 25 dm 3, further preferably of up to 30 dm 3, further preferably of up to 35 dm 3, further preferably of up to 45 dm 3, still more preferably up to 50 dm 3 and even more preferably up to 100 dm 3. A container dimensioned in this way can also be accommodated in a suitable manner in limited construction spaces and also enables good handling.According to an even further preferred embodiment, the container can be designed as a cartridge, in particular as a disposable cartridge or as a reusable cartridge. Cartridges are particularly suitable for simple handling, easy-to-handle replacement and also for practical storage. Disposable cartridges can also meet high purity requirements of the respective printing composition. Reusable cartridges ensure production which protects particular materials and resources. In particular, reusable cartridges can also be filled with new printing composition on site by the operator of the device and reused for production.According to a still further preferred embodiment, the cartridge can be designed closed and / or have an openable and / or open outlet opening. The printing mass can in this way remain reliably protected from impurities and be discharged in a controlled manner through the outlet opening. Additionally or alternatively, a cartridge can have a piston crown that can be displaced relative to a circumferential cartridge side wall. This enables a simple and reliable pressurization of the printing mass present in the cartridge and thus a controlled discharge via an outlet opening, which may preferably be arranged opposite the piston crown.According to an even more preferred embodiment, a container or the container designed as a cartridge can have a holding volume of at least 50 cm 3, preferably of at least 100 cm 3, more preferably of at least 200 cm 3, more preferably of at least 300 cm 3, more preferably of at least 500 cm 3, more preferably of at least 800 cm 3, more preferably of at least 1000 cm 3, more preferably of at least 1200 cm 3, more preferably of at least 1500 cm 3, even more preferably of at least 1800 cm 3 and even more preferably of at least 2000 cm3. With such a receiving volume, a relatively large amount of printing mass can be provided in the respective cartridge and can be applied in a metered manner to the respective printing screen for the printing of workpieces. Frequent replacement or set-up effort for replacing a emptied cartridge with a filled cartridge can thus be avoided.According to a still further preferred embodiment, a container or the container designed as a cartridge can have a holding volume of up to 200 cm 3, preferably of up to 500 cm 3, further preferably of up to 700 cm 3, further preferably of up to 900 cm 3, further preferably of up to 1000 cm 3, further preferably of up to 1200 cm 3, further preferably of up to 1500 cm 3, further preferably of up to 1700 cm 3, further preferably of up to 2000 cm 3, further preferably of up to 2500 cm 3, even more preferably up to 3000 cm 3 and even more preferably up to 4000 cm 3. A cartridge dimensioned in this way can also be arranged in a suitable manner in extremely limited construction spaces and also enables good handling or simple and reliable replacement.According to a still further preferred embodiment, the metering device can have at least one actuator for conveying the printing mass from the container. By means of such an actuator, automated or partially automated metering of printing composition can be realized in an automated manner and with only little apparatus complexity, and productivity and production precision can be improved.According to a still further preferred embodiment, the actuator for conveying the printing mass can be designed as a suction device for sucking the printing mass out of the container, in particular as a worm pump and / or eccentric worm pump. Such a suction device can be provided cost-effectively, has a high operating reliability and ensures relatively large and precisely metered delivery volumes.According to a still further preferred embodiment, the suction device can be immersed at least in sections in the container and / or in the printing mass located in the container. Such a structure can be provided with only little outlay and enables a particularly simple replacement of an emptied container with a filled container, in particular with only little equipment outlay.According to a still further preferred embodiment, the suction device can be arranged outside the container and / or be in fluid communication with the container via a suction line. Furthermore, a suction line connected to the suction device can be immersed in the container and / or in the printing mass located in the container. During operation, the risk of damage to the suction device by the printing mass can thereby be reduced and at the same time a reliable suction of the printing mass can be ensured.According to a still further preferred embodiment, the suction device can be designed and / or arranged to convey pressurized mass sucked in from the container into the feed line and up to the dispensing device. In this way, printing mass can be conveyed with particularly high reliability from the container as far as into the feed line and further to the dispensing device. A reliable and precise metering, even with a simple structural design, is ensured as a result.According to an even further preferred embodiment, the actuator for conveying the pressurized mass can be designed as a pressure-increasing device for pressurizing the pressurized mass in the container and / or for pressure-based conveyance of the pressurized mass out of the container. The metering precision can thereby be further improved. In addition, the risk of contamination of the printing mass due to lower and completely avoided contacting of the printing mass by the actuator can be reduced.According to a still further preferred embodiment, the pressure increasing device can have a linear drive, wherein the linear drive can preferably be designed as an electrical or electromechanical linear drive and / or as an electrical spindle drive and / or as an electric cylinder and / or as a linear actuator. Such a linear drive can ensure a particularly high conveying precision and can be integrated as a component of the metering device with only little outlay and at low costs.According to a still further preferred embodiment, the pressure increasing device can be designed as a pneumatic and / or hydraulic linear drive or linear cylinder. A pressure increasing device constructed in this way is reliable in operation and can generate relatively high pressure forces. In addition, with such a configuration, volumetric monitoring of the pressed-out paste from the respective container can be carried out in a particularly advantageous manner and with only little effort. A pneumatic and / or hydraulic linear drive or linear cylinder can be monitored by displacement and thus ensure accurate metering or volumetric monitoring.According to a still further preferred embodiment, the pressure increasing device can be designed and / or configured to apply a compressive force to the piston crown of a cartridge filled with pressurized mass. Additionally or alternatively, the pressure-increasing device can be designed and / or configured to displace the piston crown of a cartridge relative to the respective cartridge side wall in a longitudinal direction in order to increase the internal pressure of the cartridge. This allows an increase in the internal pressure in the respective cartridge and thus a targeted and metered pressing out of the printing composition from the cartridge to be achieved in a controlled manner without the cartridge being damaged in an undesirable manner.According to a still further preferred embodiment, the dosing device can have at least one sensor for determining the position of a piston head of a cartridge. The controlled and secure movement of the piston crown is simplified in this way. In addition, the fill level of the respective cartridge can be determined by means of such a sensor. Likewise, by means of such a sensor, a particularly reliable and controlled contacting of the piston crown by the respective actuator can be achieved.According to an even further preferred embodiment, the sensor for position determination can be configured to determine a relative position between a piston crown and the actuator for conveying the pressurized mass, in particular a relative position between a piston crown and the linear drive. The approach of the actuator to the respective piston crown and the contacting of the piston crown by the actuator can thus be effected with particularly high accuracy and safety. The pressing out of undesirably high volumes of printing material can be reliably avoided in this way.According to an even further preferred embodiment, the sensor can be configured to determine an absolute position of the piston head of a cartridge. The determination of an absolute position of the piston head of a cartridge is particularly advantageously suitable for determining the still present fill volume of printing mass.According to an even further preferred embodiment, the sensor for determining the position of the piston crown can be designed as an inductive sensor and / or as a capacitive sensor and / or as a mechanical sensor. Such a sensor can be provided cost-effectively, installed in a narrow installation space and ensures a high degree of functional reliability.According to an even further preferred embodiment, the sensor can be arranged on the actuator for conveying the printing mass, in particular on the linear drive. The determination of a relative position between the actuator and the respective piston crown of the cartridge can thereby be effected in a suitable manner.According to a still further preferred embodiment, the pressure increasing device can have a pressure container which can be closed pressure-tightly and in which the container can be positioned for storing the pasty pressurized mass. By means of an internal pressure increased in a pressure vessel, the pressure on the printing composition can also be increased in a particularly reliable manner, for example if the vessel is arranged inside the pressure vessel in the open position for storing the pasty printing composition. By increasing the pressure to the pressurized mass, the latter can in turn be conveyed and discharged in a controlled and accurately dosed manner.According to a still further preferred embodiment, the pressure vessel can have a connection opening for a compressed air supply and a compressed air line can be connected or connectable to the connection opening in a pressure-tight manner. In this case, the connection opening can preferably be formed in a cover of the pressure vessel. As a result, the internal pressure of the pressure vessel can be adjusted in a controlled manner with only little constructive complexity and thereby a delivery of pressurized mass from the respective vessel can be initiated.According to a still further preferred embodiment, the pressure vessel can have an outlet opening for the passage of the feed line or an outlet opening for the passage of an outlet line connected to the feed line, wherein the outlet opening can preferably be formed in a lid of the pressure vessel. The controlled and contamination-free application of pressurized mass from the container and also from the interior of the pressure container is made possible in this way.According to a still further preferred embodiment, the feed line or an outlet line connected to the feed line can be guided through the outlet opening into the interior of the pressure vessel, in particular into the vessel positioned in the pressure vessel and filled with pressurized mass. By increasing the internal pressure, pressurized mass can thereby be pressed in a simple and reliable manner into the feed line or into an outlet line connected to the feed line and pressurized mass can be conveyed out of the pressure container.According to a still further preferred embodiment, the feed line can be designed to be flexible and / or elastically deformable and / or flexible and / or free of plastic deformation at least in sections along its length or along its entire length. Additionally or alternatively, the feed line can flexibly follow a relative movement between the dispensing device and the container. The structural design and / or arrangement of the container and of the dispensing device can thereby be simplified and adapted flexibly with regard to the geometric requirements. Such a configuration also simplifies relative movements between the dispensing device and the container during operation and / or during maintenance and / or set-up work on the device or the dosing device.According to a still further preferred embodiment, the feed line can be produced at least in sections or along the entire length from a plastic material, in particular from polyamide and / or polyester. Such a feed line is to be provided particularly cost-effectively, can ensure a high degree of geometric flexibility and meets high requirements for the purity of the printing composition to be conveyed therein. In addition, good protection against contamination is provided.According to an even further preferred embodiment, the feed line and / or a section of the feed line can be replaceable without tools. The handling effort for the operating personnel can thereby be kept low and use of different feed lines is facilitated due to the use of different printing masses.According to an even more preferred embodiment, the feed line can have a length of at least 10 cm, preferably of at least 15 cm, more preferably of at least 20 cm, more preferably of at least 25 cm, more preferably of at least 30 cm, more preferably of at least 35 cm, more preferably of at least 40 cm, more preferably of at least 50 cm, more preferably of at least 60 cm, more preferably of at least 80 cm, more preferably of at least 100 cm, more preferably of at least 120 cm, more preferably of at least 150 cm, more preferably of at least 170 cm, more preferably of at least 200 cm, more preferably of at least 250 cm, even more preferably of at least 300 cm. In this way, the container and the dispensing device can be arranged at a relatively large distance from one another or the container and the dispensing device can be moved relative to one another along a relatively large movement range.According to an even more preferred embodiment, the feed line can have a length of up to 20 cm, preferably of up to 30 cm, more preferably of up to 40 cm, more preferably of up to 50 cm, more preferably of up to 70 cm, more preferably of up to 100 cm, more preferably of up to 150 cm, more preferably of up to 200 cm, more preferably of up to 250 cm, more preferably of up to 300 cm, more preferably of up to 400 cm, more preferably of up to 500 cm, even more preferably of up to 1000 cm. A pressure drop within or along the feed line can thereby be effectively limited and a feed pressure to be applied for the feed through the feed line can be kept low.According to an even further preferred embodiment, the dispensing device can have a plurality of dispensing openings for dispensing the printing mass onto the printing screen, in particular a plurality of dispensing openings formed discretely with respect to one another. Output openings formed discretely with respect to one another are therefore not contiguous, but rather are formed and / or arranged as individual and / or separate output openings. A particularly well-defined distribution of printing mass on the printing screen can be achieved by a plurality of discrete dispensing openings. The dispensing of printing material at defined locations on the printing screen and in a precisely defined quantity increases the reliability and accuracy of the subsequent production sequences.According to an even further preferred embodiment, at least two dispensing openings can be dimensioned differently and / or at least two dispensing openings can have cross-sectional sizes dimensioned differently from one another. In this way, any pressure difference at the different dispensing openings can be taken into account and, despite different pressures, a uniform dispensing of pressurized masses can be achieved via the respective dispensing openings.According to a still further preferred embodiment, at least one of the dispensing openings can be dimensioned smaller than a dispensing opening arranged downstream of the pressurized mass in the flow direction, and / or a dispensing opening arranged downstream of the pressurized mass in the flow direction can be dimensioned larger than at least one dispensing opening arranged upstream of the pressurized mass in the flow direction or all dispensing openings arranged upstream of the pressurized mass in the flow direction. In this way, a pressure drop along a flow direction can be compensated in a particularly preferred manner and a uniform dispensing of pressurized mass through different dispensing openings can be ensured.According to a still further preferred embodiment, the plurality of dispensing openings can be designed and / or arranged to carry out the dispensing of the printing compound onto the printing screen in printing compound sections which are discrete with respect to one another. A printing mass application to the printing screen can thereby be effected in a particularly controlled manner.According to a still further preferred embodiment, the dispensing device can be designed for dispensing the printing compound onto a closed section of the printing screen and / or onto a pressure overflow section of the printing screen. However, the printing composition can still be applied to the printing screen in an active region of the respective flooding squeegee. This enables a good subsequent distribution of the printing composition on the printing screen by the respective flooding squeegee and at the same time a particularly controlled discharge of printing composition. In addition, in this way, the printing mass can be advantageously discharged between two doctoring processes, so that a particularly efficient printing sequence can be realized.According to a still further preferred embodiment, the printing device can have a flooding squeegee for flooding the printing screen with printing material and / or a printing squeegee for pressing printing material through the printing screen and / or two printing squeegees for pressing printing material through the printing screen, wherein the output device is preferably designed for outputting the printing material starting from a position between the flooding squeegee and the printing squeegee. Likewise, the dispensing device can preferably be designed for dispensing the printing mass starting from a position between two printing squeegees.A flooding squeegee makes it possible in a particularly advantageous manner to distribute printing composition in the respective printing screen or to mix newly applied printing composition with printing composition already or still present on the printing screen. A squeegee reliably allows the applied and / or distributed printing composition to be forced through the printing screen.In the case of an arrangement of two printing squeegees or in the case of the use of two squeegees provided as a printing squeegee, flooding of the printing screen or the distribution of printing mass in the respective printing screen can be omitted in a separate step. Flooding of the printing screen or the distribution of printing composition in the respective printing screen or else mixing of newly applied printing composition with printing composition already or still present on the printing screen can be carried out while a squeegee process is being carried out. In this case, in the arrangement, two printing squeegees of both a forward and a rearward movement of the two printing squeegees can be used for printing in the squeegee direction, namely in the forward direction with one printing squeegee and in the rearward direction with the respective other printing squeegee. A flooding squeegee can advantageously also be used as a printing squeegee.An arrangement of the dispensing device for dispensing the printing mass starting from a position between the flow squeegee and the printing squeegee or between two printing squeegees permits a particularly space-saving configuration and an efficient dispensing of the printing mass temporally between a printing squeegee movement and a flow squeegee movement and / or during a printing squeegee movement and / or a flow squeegee movement in a squeegee direction.According to a still further preferred embodiment, the dispensing device can run at least in sections or completely between the flooding squeegee and the printing squeegee and / or between two printing squeegees, in particular in a direction transverse or at an angle to the squeegee direction. Additionally or alternatively, the dispensing device can run at least in sections parallel to a doctor edge of the flooding squeegee and / or of the at least one printing squeegee and / or the dispensing device can run as far as into an intermediate space between the flooding squeegee and the printing squeegee and / or between two printing squeegees. Such a configuration can be constructed in a particularly compact manner and at the same time ensures a reliable and relatively low-movement process sequence in the application of printing composition, the flooding of the printing screen and / or the printing or subsequent printing of the printing paste by means of a squeegee movement.According to an even further preferred embodiment, a plurality of or the plurality of output openings can be distributed between the flooding squeegee and the printing squeegee and / or arranged between two printing squeegees, in particular arranged distributed in a direction transverse or at an angle to the squeegee direction. By means of such a configuration, the respective printing composition can be distributed particularly uniformly and favorably with regard to subsequent squeegee movements. The discharged printing mass can thereby be arranged distributed in particular advantageously along a longitudinal extension of the respective squeegee, so that a relatively uniform capture of the printing mass can be ensured with a squeegee movement.The squeegee direction can be or should be understood here to mean a direction along which the respective squeegee is moved through the printing screen during flooding of the printing screen or during printing or pressing through of printing mass. A lowering movement or lifting movement of the flooding squeegee or of the printing squeegee is therefore not understood as a squeegee direction.According to a still further preferred embodiment, the dispensing device can have at least one dispensing slot or a plurality of dispensing slots, wherein the dispensing slot preferably runs in a direction transverse or at an angle to the doctor blade direction. A dispensing slot can further improve the uniformity of the dispensing of the printing composition. By a course of an output slot in a direction transverse or at an angle to the doctor blade direction, the printing mass can be distributed in a particularly advantageous manner with regard to subsequent doctor blade movements. The discharged printing mass can advantageously be arranged distributed along a longitudinal extent of the respective squeegee, so that a relatively uniform capture of the printing mass can be ensured with a squeegee movementAccording to an even further preferred embodiment, at least one dispensing slot of the dispensing device can have a varying width along the longitudinal extension. Such a width change can be effected continuously or continuously. A pressure drop along the discharge slot can thereby be compensated and a uniform discharge of the pressurized mass can be ensured even with a relatively long discharge slot.According to an even further preferred embodiment, at least one dispensing slot of the dispensing device can have different widths at portions spaced apart from one another in the longitudinal extension of the dispensing slot. Different widths in the longitudinal direction can be realized by a stepwise or even by a continuously variable width change. In this way, too, any pressure drop along the discharge slot can be compensated for with only little structural complexity and a uniform discharge of the pressurized mass can be ensured.According to an even further preferred embodiment, at least one dispensing slot of the dispensing device can be dimensioned larger and / or wider in a slot section formed downstream of the pressurized mass in the flow direction than at least one slot section upstream in the flow direction. Insofar as an appreciable pressure drop of the pressurized mass is or should be present in the flow direction of the pressurized mass, this can be counteracted in a particularly advantageous manner by such a configuration.According to a still further preferred embodiment, at least one dispensing slot of the dispensing device can have a size and / or width which increases continuously at least in sections along the flow direction of the printing mass. By means of an increasing size and / or width, a possible pressure drop in the flow direction of the pressurized mass can be compensated particularly suitably, such that sufficient pressurized mass can also be effected from regions of the discharge slot which are arranged relatively far downstream in the flow direction or are arranged far away from the container.According to an even further preferred embodiment, the output device can be arranged to travel with the flooding squeegee and / or with the printing squeegee and / or with the printing squeegees, in particular to travel with it in a squeegee direction. The risk of collisions between a squeegee and the dispensing device can be reduced as a result. In addition, such a configuration can be implemented comparatively easily in terms of design. In particular, the dispensing device can be arranged in this way free of dedicated actuators, since a movement always takes place together with the respective doctor blades. Moving the dispensing device independently of the doctor blades is not absolutely necessary.According to an even further preferred embodiment, the metering device can be configured to dispense printing mass via the dispensing device during a squeegee movement in a squeegee direction. In particular, the metering device can be configured for the continuous and / or periodically recurring dispensing of printing mass via the dispensing device during a squeegee movement in a squeegee direction. This makes it possible to achieve particularly time-saving delivery of printing composition.According to a still further preferred embodiment, the metering device can be configured for dispensing printing mass during a joint and / or moving movement of the dispensing device with a flooding squeegee and / or with at least one printing squeegee in a squeegee direction, in particular from a position of the dispensing device moving along and / or moving along in the squeegee direction between a flooding squeegee and a printing squeegee and / or between two printing squeegees. This ensures a particularly time-saving process sequence and thus high productivity with simultaneously high operating reliability.According to a still further preferred embodiment, the metering device can be configured to dispense printing mass during a stationary position of a printing squeegee and / or of a flooding squeegee that is stationary and / or at a standstill in the squeegee direction. The dispensing of the printing composition can be effected in a particularly controlled manner in this way.According to a still further preferred embodiment, the metering device can have at least one actuator for moving the dispensing device, in particular for moving the dispensing device transversely or at an angle to the doctor blade direction. In this way, a movement of the dispensing device independent of the respective doctor blades can be realized. This allows a particularly compact arrangement of the flooding and printing squeegee, since the dispensing device can only be moved into a movement range of the squeegee depending on requirements. Additionally or alternatively, the dispensing device can be made compact itself in this way, since a larger dispensing region can be covered due to the mobility.According to a still further preferred embodiment, the actuator can be designed to move the dispensing device during the dispensing of the printing mass onto the printing screen. By moving the dispensing device during the dispensing of the printing mass onto the printing screen, a relatively good distribution of a larger dispensing area can be ensured.According to a still further preferred embodiment, the actuator can be designed for moving the dispensing device out of a waiting position into a dispensing position and / or out of a dispensing position into a waiting position. In a waiting position, a collision with the doctor blades or other components can be avoided. In a dispensing position, efficient dispensing along a relatively large dispensing area can be ensured. The operational reliability and output functionality can thereby be further improved.According to an even further preferred embodiment, the dispensing device can have at least one dispensing tube section in which at least one dispensing opening and / or one dispensing slot is formed. A dispensing tube section can be provided cost-effectively, have a relatively large length for good distribution of the printing composition and at the same time ensure a high degree of operational reliability.According to an even further preferred embodiment, a plurality of discharge openings can be provided in the discharge pipe section and / or arranged distributed along a flow direction of the pressurized mass. Additionally or alternatively, at least one dispensing slot can be formed in the dispensing tube section so as to extend in the flow direction of the pressurized mass. This can be done with only little effort and ensures a high degree of functionality for the metered dispensing of printing composition along a relatively large or elongated dispensing region.According to a still further preferred embodiment, the output tube section can extend between the flooding squeegee and the printing squeegee, in particular transversely or at an angle to the squeegee direction and / or parallel to a squeegee edge of the flooding squeegee and / or of the printing squeegee. This ensures a particularly space-saving and compact arrangement, with simultaneously favorable distribution of the printing composition with respect to subsequent doctoring processes.According to a still further preferred embodiment, the dispensing device can have a plurality of dispensing tube sections which are preferably aligned with one another and / or which are arranged such that they can be moved uniformly with one another by one actuator or by a plurality of actuators. This makes it possible to realize a further improved metering and distribution of printing composition. In particular, a plurality of output tube sections can be formed discretely with respect to one another or separately from one another. Such dispensing tube portions may be independently disposed and mounted. By means of a plurality of output tube sections, the risk of a large pressure drop can be reduced.Furthermore, the dispensing device can have a plurality of dispensing tube sections which are connected to one another to form a dispensing tube and / or are formed integrally with one another as a dispensing tube. The output tube sections can also be in fluid communication with one another. In this case, it is possible for pressurized mass to be introduced via opposite ends into the two output pipe sections connected to one another. The printing compound can be discharged via discharge openings or one discharge slot or a plurality of discharge slots between the opposite ends. Within the output tube sections connected to one another or formed integrally with one another, it is therefore possible to realize counter-rotating pressurized mass flows.Dispensing tube sections connected to one another in this way or formed integrally with one another can be produced cost-effectively, can be cleaned easily and ensure high operational reliability. Likewise, output tube sections connected to one another in this way or formed integrally with one another can be aligned with one another and / or arranged such that they can be moved uniformly with one another by one actuator or by a plurality of actuators.According to a still further preferred embodiment, the feed line can have at least one distributor, preferably a plurality of distributors, for distributing a pressurized mass flow to a plurality of parallel-connected feed line sections and / or for feeding a pressurized mass flow to a plurality of output openings and / or a plurality of output slots and / or a plurality of output pipe sections. Such branching improves the targeted metering of different pressurized mass flows to different output points or to different points on the printing screen. The distribution can be improved overall. In addition, a larger drop in the pressurized mass between different dispensing openings or dispensing points along a single line can be avoided.According to a still further preferred embodiment, the feed line can have at least two feed line sections connected in parallel by a distributor. Of the parallel-connected feed line sections, additionally or alternatively at least one feed line section can have a further distributor for distributing a pressurized mass flow to a plurality of parallel-connected feed line sub-sections. As a result, a particularly favorable distribution of a pressurized mass flow can be achieved with only a small amount of installation and assembly effort.According to a still further preferred embodiment, the dispensing device can be designed and / or arranged to dispense the printing compound onto the printing screen in at least one longitudinally extended or line-shaped printing compound section. Starting from this, a particularly uniform distribution of the printing composition on the printing screen or a particularly uniform mixing with printing composition still present on the printing screen can be effected in only one flooding squeegee process.According to a still further preferred embodiment, the metering device can have at least one shut-off valve for shutting off a pressurized mass flow, wherein the shut-off valve can preferably be designed as part of the feed line and / or for shutting off the feed line. An undesired discharge of printing mass, for example during a squeegee movement, can be reliably avoided as a result, so that a high degree of process safety can be ensured.According to an even further preferred embodiment, along the course of the feed line, the distance of the shut-off fitting from the container with pressurized mass can be greater than the distance of the shut-off fitting from the dispensing device and / or from at least one dispensing opening and / or a dispensing slot. The risk of undesired follow-up of the printing mass from the dispensing device and / or from a dispensing opening and / or from a dispensing slot can thus be reduced. The volume of pressurized mass situated behind the shut-off valve in the flow direction can thereby be kept in particular small.According to a still further preferred embodiment, the dosing device can have a container changing device for automatically changing the container dispensing printing mass in each case, in particular the container designed as a cartridge or the container designed as a bucket. The productivity of the device can be further improved in this way and a personnel-intensive use can be prevented. The risk of manual misoperations can also be reduced. Furthermore, in this way, it is possible to use different printing compounds for producing a screen-printed workpiece with only little effort.Manufacturing flexibility with respect to a single screen printed workpiece is thus further increased.According to an even further preferred embodiment, the container changing device can be designed for the tool-free and / or automated or semi-automated changing of the container dispensing printing compound in each case. This ensures a particularly high ease of handling and operational reliability and only a small amount of personnel required during operation of the device.According to a still further preferred embodiment, the container changing device can have a rotary indexing table for a container designed as a bucket. This ensures a space-saving construction with high functional reliability. A rotary indexing table can also be easily operated and fitted with containers. Similarly, emptied containers can easily be removed again from a round indexing table for renewed filling.According to a still further preferred embodiment, the container changing device can have a connection plate with a passage for the connection of the feed line. The passage may be configured for passing pressurized mass from a container. In this case, depending on a relative position between the connection plate and a plurality of containers, a fluid connection can preferably be produced between the feed line and one of the plurality of containers. Such a fluid connection can be established in particular via the passage of the connection plate. Additionally or alternatively, a fluid connection between the feed line and a further container can be produced by adjusting the relative position between the connection plate and at least one container. This makes it possible to ensure an efficient and time-saving change of the container dispensing the respective printing composition.According to an even further preferred embodiment, the container changing device can be arranged outside a pressure region of the pressure device.Additionally or alternatively, the container changing device can be arranged spaced apart in the horizontal direction relative to the printing screen or arranged below a printing table of the printing device in the vertical direction. Geometric collisions between components of the printing device and the container changing device can thereby be avoided. The arrangement of the container changing device can be arranged particularly advantageously with regard to any geometric restrictions of the printing device.According to a still further preferred embodiment, the metering device and / or the actuator can be designed for conveying the printing mass from the container for volumetric metering of the printing mass. The accuracy of the metering can thereby be improved particularly advantageously and with only little effort.According to an even further preferred embodiment, the metering device and / or the actuator can be designed for conveying the printing mass from the container for stroke-based and / or volumetric metering of the printing mass. Additionally or alternatively, the actuator can be designed to convey the pressurized mass for volumetric metering by means of stroke control. The precision of the dosing can thereby be further improved. When a linear actuator or a linear drive is used as the actuator, the stroke position can advantageously be used as a basis for determining the metered quantity of the printing mass.According to a still further preferred embodiment, the dosing device can have a receiving cavity for receiving a cartridge, wherein the receiving cavity can preferably be configured for the at least partially lateral and / or circumferential support of a cartridge side wall. This ensures reliable positioning of the cartridge. In addition, this also makes it possible to relieve the cartridge side wall with regard to increased internal pressures of the cartridge.According to an even further preferred embodiment, the actuator for moving the dispensing device can be designed as a portal axis system or as part of a portal axis system. A portal axis system can cover large movement spaces and thus ensure a suitable distribution of the printing mass. Furthermore, portal axle systems are simple in construction and can move high carrying masses with high accuracy and safety.According to an even further preferred embodiment, the metering device can have a run-on stop device for preventing and / or reducing a run-on of printing mass from the metering device and / or from the dispensing device. The process safety of metering printing composition can be further improved in this way. An undesired running of printing mass from the dispensing device, for example during a squeegee movement, and / or contamination of device components which are intended to remain free of printing mass can thereby be avoided or a possible risk can be reduced.According to a still further preferred embodiment, the after-run stop device can be formed by the shut-off fitting. Such a run-on stop device can be provided with only little outlay and ensures a relatively high degree of functional reliability for preventing run-on.According to an even further preferred embodiment, the after-run stop device can be designed to relieve pressure on a piston head of a cartridge. Additionally or alternatively, the follow-up stop device can be designed to reverse the movement of a piston crown of a cartridge and / or to reverse the movement of the actuator for conveying the printing mass. A run-on stop can thereby be achieved with further increased certainty. In particular, such a configuration can also be implemented without a shut-off fitting, so that a run-on stop can be realized with only a small number of components or assemblies.According to an even further preferred embodiment, the run-on stop device can be designed to cancel, in particular temporarily cancel, the operative engagement and / or the contact between the actuator for conveying the printing mass, in particular the linear drive, and the piston head of a cartridge. By cancelling the active engagement and / or the contact, a pressure in the interior of the cartridge can be reduced again quickly and efficiently.By means of a pressure release, the printing mass remaining in the cartridge can release pressure and automatically displace the piston crown back to a relatively small extent in the direction of the actuator or the linear drive. This can lead-again to a slight extent-to a return of printing mass from the feed line into the cartridge, so that a run-back from the dispensing device can be relatively reliably avoided.According to an even further preferred embodiment, the run-on stop device can have a pressure-based control and / or be designed to avoid and / or reduce running-on of printing mass from the output device by a pressure-based control. By means of such a control, an undesired run-up can be avoided with particularly high certainty.According to an even further preferred embodiment, the pressure-based control can be configured to record and / or process a delivery pressure of the printing mass and / or a pressure generated by an actuator for delivering the printing mass and / or acting on a piston crown of a cartridge. Such a detection and processing of a delivery pressure or a pressure generated by an actuator and / or acting on a piston crown of a cartridge can be implemented with cost-effective and functionally reliable components, in particular pressure sensors and / or data processing devices. A pressure-based regulation can thereby be realized particularly advantageously and at low device costs.According to a still further preferred embodiment, the dispensing device can have a stripping device for stripping printing mass from a dispensing opening or from a dispensing slot. Such a wiping device can prevent undesired or uncontrolled dripping of printing compound and the risk of contamination of device components can be effectively reduced.According to an even further preferred embodiment, the feed line can have a return stop device for preventing and / or reducing the return of pressurized mass counter to an output flow direction, wherein the return stop device is preferably designed as a shut-off fitting.Such a shut-off fitting can preferably be designed as a ball valve and / or can be manually actuated. The shut-off valve can likewise also be designed as an automatically actuated or actuatable shut-off valve.By means of such a configuration, a return of the pressurized mass, for example due to an elastic deformation of the feed line or an internal prestress of the pressurized mass present in the feed line, can be reliably prevented. In particular, it is thereby possible to prevent the printing mass in the feed line from flowing back in the direction of the container and being forced out of a container-side end of the feed line when the respective cartridge is changed within the feed line. The risk of contaminants in the region of the container or a cartridge or any container receptacle can thus be reduced.A return stop device can be actuated in a preferred manner before the respective container is changed, in particular can be actuated manually or automatically or partially automatically.A return stop device is furthermore particularly advantageous when the metering device is also equipped with a return stop device, in particular with a return stop device designed as a shut-off valve. This is because, by means of such a run-on stop device, a residual amount of pressurized mass in the feed line can no longer escape in the direction of the dispensing device, but would tend to flow back in the direction of the container in the event of flexible deformation of the feed line. This can be reliably avoided with a return stop device.According to a still further preferred embodiment, along the course of the feed line, the distance of the return stop device from the container with pressurized mass can be less than the distance of the return stop device from the dispensing device. The risk of a return of pressurized mass in the feed line in the direction of the container and a emergence from a container-side end of the feed line can be further reduced to the latter. With a small distance between the return stop device and the container, the risk is reduced that an internal tension of the pressurized mass present in the feed line between the container and the return stop device or a flexible deformation of the feed line causes uncontrolled return and a emergence of pressurized mass from the container-side end of the feed line.According to a still further preferred embodiment, the feed line between the container and the return stop device can be designed at least in sections as a rigid or inflexible line. In contrast, the feed line between the return stop device and the dispensing device can be designed at least in sections as a flexible or flexibly deformable line.A further independent aspect of the present invention relates to an apparatus for producing three-dimensional screen-printed workpieces, in particular a 3D screen-printing system, having a printing device having a printing screen for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes and having a metering device for the metered dispensing of a pasty printing compound onto the printing screen, wherein the metering device has at least one container for storing the pasty printing compound and / or a dispensing device for dispensing the printing compound onto the printing screen and at least one actuator for moving the container and / or the dispensing device, wherein the actuator is designed as a portal axis system or as part of a portal axis system.A device formed in this way according to the further independent aspect of the present invention can be formed in a preferred manner with individual ones of the advantageous configurations described above or all of the advantageous configurations described above.Yet another independent aspect of the present invention relates to an apparatus for producing three-dimensional screen-printed workpieces, in particular a 3D screen-printing system, having a printing device having a printing screen for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes and having a metering device for the metered dispensing of a pasty printing compound onto the printing screen, wherein the metering device has a run-on stop device for preventing and / or reducing the run-on of printing compound from the metering device.A device designed in this way according to the still further independent aspect of the present invention can also be designed in a preferred manner with individual ones of the advantageous configurations described above or all of the advantageous configurations described above.Yet another independent aspect of the present invention relates to a method for producing three-dimensional screen-printed workpieces, in particular with an apparatus described above, in which a screen-printed workpiece is produced in layers in a plurality of printing processes in a printing device having a printing screen, and in which a pasty printing compound is dispensed in a metered manner onto the printing screen with a metering device, wherein a printing compound is conveyed out of a container for storing the pasty printing compound by means of the metering device and is conveyed through a feed line as far as a dispensing apparatus for dispensing the printing compound onto the printing screen.Yet another independent aspect of the present invention relates to a method for producing three-dimensional screen-printed workpieces, in particular with an apparatus described above, in which a screen-printed workpiece is produced in layers in a plurality of printing processes in a printing device having a printing screen, and in which a pasty printing compound is dispensed onto the printing screen in a metered manner with a metering device, wherein a run-on of printing compound from the metering device is avoided or reduced by means of a run-on stop apparatus.The details and independent aspects described above with respect to the device, including the subordinate aspects relating to a device, apply in the same way to the methods according to the invention described above according to the further independent aspects.The invention is described below by way of example on the basis of advantageous embodiments with reference to the appended figures.They show in each case schematically: FIG. 1 shows a perspective view of a device according to the invention according to an exemplary embodiment, FIG. 2 shows a side view of the apparatus of FIG. 1 with an open illustration of a printing device without a housing, FIG. 3 is a perspective view of a printing device of the device of FIG. 1, FIG. 4 shows a perspective view of a metering device of the apparatus of FIG. 1, FIG. 5 shows a side view of the dosing device from FIG. 4, FIG. 6 shows a partial view of the metering device from FIG. 4 with an open illustration of a container housing, FIG. 7 is a sectional view along the section line A-A from FIG. 6 , FIG. 8 shows a detailed view of a dispensing device according to an exemplary embodiment of the present invention, FIG. 9 shows a detailed view of a dispensing device according to a further exemplary embodiment of the present invention, FIG. 10 shows a detailed view of a dispensing device according to yet another exemplary embodiment of the present invention, FIG. 11 shows a partial view of a printing device and of a metering device according to a further exemplary embodiment, FIG. 12 is a sectional view along the section line A-A from FIG. 11 , FIG. 13 shows a detailed view of a dispensing device according to the exemplary embodiment of FIGS. 11 and 12, FIG. 14 shows a perspective view of a metering device according to a further exemplary embodiment of the present invention, FIG. 15 shows a side view of the dosing device of FIG. 14, FIG. 16 shows a perspective view of a device according to the invention according to a further exemplary embodiment, FIG. 17 shows a sectional illustration of the device from FIG. 16, FIG. 18 is a side view of the device of FIG. 16, FIG. 19 shows a perspective view of a metering device according to an exemplary embodiment of the present invention, FIG. 20 shows a side view of the dosing device of FIG. 19, FIG. 21 shows a perspective view of a metering device according to a further exemplary embodiment of the present invention, FIG. 22 shows a side view of the dosing device of FIG. 21, FIG. 23 shows a perspective partial view of the metering device from FIG. 22 with the illustrated dispensing device and the illustrated pressure screen, FIG. 24 is a detailed side view of the dispenser of FIG. 23 with doctor blades shown, FIG. 25 shows a plan view of a printing screen of an apparatus according to the invention according to an exemplary embodiment of the present invention, FIG. 26 is a side view of a container changing device according to an exemplary embodiment of the present invention in a first operating position, FIG. 27 is a side view of the container changing device of FIG. 26 in a further operating position, FIG. 28 shows a detailed view of a container changing device according to an exemplary embodiment of the present invention, FIG. 29 shows a further detailed view of the container changing device according to FIG. 28, FIG. 30 shows a side view of a metering device according to a further exemplary embodiment of the present invention, FIG. 31 is a side view of the dosing device of FIG. 30 during the supply of printing composition, FIG. 32 shows a side view of the metering device of FIG. 30 during a wire flooding by a flooding squeegee movement, FIG. 33 is a side view of the dosing device of FIG. 30 after the container has been changed, FIG. 34 shows a further perspective view of a metering device according to the exemplary embodiment of FIGS. 14 and 15, FIG. 35 shows a detailed view of FIG. 34.FIG. 1 shows a perspective view of an apparatus 10 for producing three-dimensional screen-printed workpieces according to an exemplary embodiment of the present invention. The device 10 can be, in particular, a 3D screen printing system. In particular, the device 10 can be a 3D screen printing system for the production of pharmaceuticals.FIG. 2 shows a side view of the device 10 from FIG. 1, The device 10 can have an enclosure 12 which is not shown in FIG. 2 for the sake of better illustration. Furthermore, the apparatus 10 has a pressure device 14, which is therefore shown open in FIG. 2. FIG. 3 further shows a perspective view of the printing device 14 of the apparatus 10 from FIG. 1.The printing device 14 can be designed for the layer-by-layer production of at least one screen-printed workpiece, not shown in more detail here, in a plurality of printing processes. For this purpose, the printing device can have a printing screen 16. Furthermore, the printing device 14 can have a metering device 18 for the metered dispensing of a pasty printing mass onto the printing screen 16. The printing device 14 can be arranged, for example, adjacent to further functional regions of the apparatus 10, for example to an inspection region for screen-printed workpieces and / or to a drying region for screen-printed workpieces. The dimensions of the printing device 14 can be substantially conditioned by the printing screen 16 and / or by a frame mounting and / or suspension for the printing screen 16 and / or limited by a printing table 32.An embodiment of a dosing device 18 can be seen from FIGS. 4 to 8. Such a metering device 18 can have at least one container 20 for storing a pasty printing compound 22, a dispensing device 24 for dispensing the printing compound 22 onto the printing screen 16, and a feed line 26 running between the container 20 and the dispensing device 24 for feeding the printing compound 22 from the container 20 to the dispensing device 24.As shown in FIG. 5, the dosing device 18 can also have a multi-part dispensing device 24, as will be explained in more detail below. Likewise, the dispensing device 24 can be formed in one piece.FIG. 5 shows the container 20 within an enclosure 28 and therefore cannot be seen in more detail. FIG. 6 shows a sectional illustration along the line A-A from FIG. 5 ; in FIG. 6, the container 20 is shown in a largely emptied state, so that only a small residue of printing compound 22 is shown in the container 20.It can be seen from FIGS. 2 and 3 that the container 20 can be arranged outside a pressure region 30 of the pressure device 14. In this case, the container 20 can be arranged spaced apart in the horizontal direction relative to the printing screen 16.Additionally or alternatively, the container 20 can be arranged below a printing table 32 of the printing device 14 in the vertical direction, which is not shown in the exemplary embodiment according to FIGS. 1 to 4, but can be provided, for example, in the exemplary embodiment according to FIGS. 21 and 22.It can also be seen from FIGS. 2 and 3 that the container 20 can be and can remain spaced apart from a printing region 30 of the printing device 14 and / or in the horizontal direction relative to the printing screen 16, in particular also during the dispensing of the printing compound 22.Additionally or alternatively, the container 20 can in particular also be arranged and remain below a printing table 32 of the printing device 14 during the dispensing of the printing compound 22 in the vertical direction, which is not shown in the exemplary embodiment according to FIGS. 1 to 4, but can be provided for example in the exemplary embodiment according to FIGS. 21 and 22.The container 20 may further be and / or remain stationary during dispensing of the printing mass 22.In the exemplary embodiment according to FIGS. 1 to 7, the container 20 can be designed in particular as a cartridge 34, for example as a disposable cartridge or as a reusable cartridge. Such a cartridge 34 can be embodied closed and / or have an openable and / or open outlet opening 35. Furthermore, such a cartridge 34 can have a piston crown 38 which can be displaced relative to a circumferential cartridge side wall 36, as is illustrated in more detail in FIGS. 6 and 7.A container 20 designed as a cartridge 34 can have a holding volume of at least 50 cm 3, preferably of at least 100 cm 3, more preferably of at least 200 cm 3, more preferably of at least 300 cm 3, more preferably of at least 500 cm 3, more preferably of at least 800 cm 3, more preferably of at least 1000 cm 3, more preferably of at least 1200 cm 3, more preferably of at least 1500 cm 3, even more preferably of at least 1800 cm 3 and even more preferably of at least 2000 cm3.Furthermore, a container 20 designed as a cartridge 34 can have a holding volume of up to 200 cm 3, preferably of up to 500 cm 3, more preferably of up to 700 cm 3, more preferably of up to 900 cm 3, more preferably of up to 1000 cm 3, more preferably of up to 1200 cm 3, more preferably of up to 1500 cm 3, more preferably of up to 1700 cm 3, more preferably of up to 2000 cm 3, more preferably of up to 2500 cm 3, even more preferably of up to 3000 cm3and even more preferably of up to 4000 cm3.The metering device 18 can furthermore have at least one actuator 40 for conveying the printing mass 22 from the container 20.In the exemplary embodiment according to FIGS. 1 to 7, the actuator 40 for conveying the pressurized mass 22 can be designed as a pressure-increasing device 42 for pressurizing the pressurized mass 22 in the container 20 and / or for pressure-based conveyance of the pressurized mass 22 out of the container 20.Such a pressure increasing device 42 can have a linear drive 44, wherein a linear drive 44 can preferably be designed as an electrical or electromechanical linear drive 44. Likewise, a linear drive 44 can be designed as an electric spindle drive and / or as an electric cylinder and / or as a linear actuator.A pressure increasing device can furthermore be designed as a pneumatic and / or hydraulic linear drive or linear cylinder, which is not shown in more detail in the exemplary embodiment according to FIGS. 1 to 7.The pressure-increasing device 42 can be designed and / or configured to apply a compressive force to the piston crown 38 of a cartridge 34 filled with pressurized mass 22, and / or to displace the piston crown 38 of a cartridge 34 relative to the respective cartridge side wall 36 in a longitudinal direction in order to increase the internal pressure of the cartridge 34. In this way, the printing compound 22 can be pressed out of the outlet opening 35 in a particularly advantageous manner and can be conducted into the feed line 26 as far as the dispensing device 24.Furthermore, the dosing device 18 can have at least one sensor 46 for determining the position of a piston head 38 of a cartridge 34, as is shown schematically in FIG. 7.The sensor 46 can be configured to determine a relative position between a piston crown 38 and the actuator 40 for conveying the pressurized mass 22. In particular, the sensor 46 can be configured to determine a relative position between a piston crown 38 and a free end of a plunger 48 of the actuator 40.Such a plunger 48 can be part of the linear drive 44 or can be connected to the linear drive 44 for transmitting a driving force.Furthermore, the sensor 46 can be configured to determine an absolute position of the piston head 38 of a cartridge 34.Furthermore, a plurality of sensors can be provided which provide different functions and / or at least partially redundant functions. For example, a sensor for monitoring a fill level of the container 20 can be provided, as will be described in more detail below with reference to the exemplary embodiments in FIGS. 26 to 33.A sensor for monitoring a fill level of the container 20 can be provided separately from the sensor 46. A sensor for monitoring a fill level can likewise be formed by the sensor 46, which sensor can in turn be configured to determine an absolute position of the piston head 38 of a cartridge 34 and / or to determine a relative position between a piston head 38 and the actuator 40 for conveying the printing mass 22. From such an absolute position and / or relative position, a fill level of the container 20 can be determined.The sensor 46 for determining the position of the piston crown 38 can be designed in particular as an inductive sensor and / or as a capacitive sensor and / or as a mechanical sensor.As has been indicated schematically in FIG. 7, the sensor 46 can be arranged on the actuator 40 for conveying the pressurized mass 22. In particular, the sensor 46 can be arranged on the linear drive 44 or on a tappet 48, wherein the tappet 48 can be formed as part of the actuator 40 and / or the linear drive 44 or can be coupled to the linear drive 44.The feed line 26 can be designed to be flexible in a deformable and / or elastically deformable and / or flexible and / or free of plastic deformation at least in sections along its length or along its entire length. Likewise, the feed line 26 can flexibly follow a relative movement between the dispensing device 24 and the container 20. Such a relative movement between the dispensing device 24 and the container 20 can be effected, for example, by a doctoring movement, as will be explained in more detail below, for example with reference to FIGS. 10 and 11 and also 29 to 33.Furthermore, the feed line 26 can be produced from a plastic material at least in sections or along the entire length. In particular, the feed line 26 can be formed at least in sections or along the entire length from polyamide and / or polyester or can comprise such a plastic, for example as a coating and / or cladding.Furthermore, the feed line 26 and / or a section of the feed line 26 can be replaceable without tools. Such exchangeability simplifies the use of different and / or alternating printing masses and prevents unwanted contamination of printing masses by residues in the feed line 26.The feed line 26 can have a length of at least 10 cm, preferably of at least 15 cm, further preferably of at least 20 cm, further preferably of at least 25 cm, further preferably of at least 30 cm, further preferably of at least 35 cm, further preferably of at least 40 cm, further preferably of at least 50 cm, further preferably of at least 60 cm, further preferably of at least 80 cm, further preferably of at least 100 cm, further preferably of at least 120 cm, further preferably of at least 150 cm, further preferably of at least 170 cm, further preferably of at least 200 cm, further preferably of at least 250 cm, even further preferably of at least 300 cm.Likewise, the feed line can have a length of up to 20 cm, preferably of up to 30 cm, further preferably of up to 40 cm, further preferably of up to 50 cm, further preferably of up to 70 cm, further preferably of up to 100 cm, further preferably of up to 150 cm, further preferably of up to 200 cm, further preferably of up to 250 cm, further preferably of up to 300 cm, further preferably of up to 400 cm, further preferably of up to 500 cm, even further preferably of up to 1000 cm.FIGS. 8 to 10 show detailed views of a dispensing device 24 according to different exemplary embodiments of the present invention.In the exemplary embodiment according to FIG. 8, the dispensing device 24 can have a plurality of dispensing openings 62 for the dispensing of the printing mass 22 onto the printing screen 16. In particular, the dispensing device 24 can have a plurality of dispensing openings 62 formed discretely with respect to one another. At least two dispensing openings 62 can be dimensioned differently from one another. In particular, all the dispensing openings 62 can be dimensioned differently from one another. Thus, each dispensing opening 62 can be dimensioned differently from each of the other dispensing openings 62 of the respective dispensing device 24.For this purpose, at least two dispensing openings 62 can have cross-sectional sizes of different dimensions from one another. In particular, each dispensing opening 62 can have a cross-sectional size that is dimensioned differently from the cross-sectional size of each other dispensing opening 62. A dispensing device 24 may also have different shaped dispensing openings 62.In a preferred manner, at least one of the discharge openings 62 can be dimensioned smaller than a discharge opening 62 arranged downstream of the pressurized mass 22 in the flow direction 64 Likewise, a discharge opening 62 arranged downstream of the pressurized mass 22 in the flow direction 64 can be dimensioned larger than at least one discharge opening 62 arranged upstream of the pressurized mass 22 in the flow direction 64 or all discharge openings 62 arranged upstream of the pressurized mass in the flow direction 64.The further the respective pressurized mass 22 flows in the dispensing device 24 along the flow direction 64, the more the pressurized mass 22 is discharged or pressed out through a dispensing opening 62 of relatively large dimensions. A pressure drop within the dispensing device 24 that occurs in the flow direction 64 can be well compensated for as a result, and a uniform or equal or relatively well distributed pressurized mass discharge can nevertheless be ensured by the differently dimensioned dispensing openings 62.The plurality of output openings 62 of the output device 24 can furthermore be designed and / or arranged to carry out the output of the printing mass 22 onto the respective printing screen 16 in printing mass sections which are discrete with respect to one another. The sections of printing material applied to a printing screen 16 can be clearly differentiated from one another in such a configuration and a particularly controlled output can be ensured thereby.A plurality or the plurality of output openings 62 can be arranged distributed between a flooding squeegee 50 and a printing squeegee 52, in particular arranged distributed in a direction transverse or at an angle to a squeegee direction 54. Consequently, a dispensing device 24 illustrated, for example, in FIG. 8 can be arranged running between the flooding squeegee 50 and the printing squeegee 52 in such a way that at least a plurality or all of the dispensing openings 62 are arranged distributed between the flooding squeegee 50 and the printing squeegee 52.The arrangement of an output device 24 between a flooding squeegee 50 and a printing squeegee 52 or between two printing squeegees is explained in more detail below with reference to the exemplary embodiment in FIGS. 11 to 13.FIG. 9 shows a detailed view of a dispensing device 24 according to a further exemplary embodiment of the present invention. The embodiment in FIG. 9 differs from the embodiment in FIG. 8 in terms of the shape of the dispensing openings 62.The dispensing device 24 according to FIG. 9 has at least one dispensing slot 66 or a plurality of dispensing slots 66. In this case, at least one dispensing slot 66 can preferably run in a direction transverse or at an angle to the doctor blade direction 54. In particular, a longitudinal extension of the at least one dispensing slot 66 can preferably run in a direction transverse or at an angle to the doctor blade direction 54. Furthermore, the longitudinal extent of the at least one dispensing slot 66 can run at least in sections in the flow direction 64 of the pressurized mass 22 within the respective dispensing device 24.All of the dispensing slits 66 can extend in their longitudinal extent in the flow direction 64 and / or transversely or at an angle to the doctor blade direction 54. At least two or all of the dispensing slots 66 may be formed in alignment with one another in their longitudinal extent.At least two dispensing slots 66 may be dimensioned differently from one another. In particular, all dispensing slots 66 can be dimensioned differently from one another. Thus, each dispensing slot 66 may be dimensioned differently than each of the other dispensing slots 66 of the respective dispensing device 24.For this purpose, at least two dispensing slots 66 can have different slot widths. In particular, each dispensing slot 66 may have a slot width that is dimensioned differently than the slot width of each other dispensing slot 66.In a preferred manner, at least one of the dispensing slits 66 can be dimensioned smaller than a dispensing slit 66 arranged downstream of the pressurized mass 22 in the flow direction 64 Likewise, a dispensing slit 66 arranged downstream of the pressurized mass 22 in the flow direction 64 can be dimensioned larger or wider than at least one dispensing slit 66 arranged upstream of the pressurized mass 22 in the flow direction 64 or all of the dispensing slits 66 arranged upstream of the pressurized mass in the flow direction 64 A pressure drop within the dispensing device 24 that occurs in the flow direction 64 can be suitably compensated for thereby and a uniform or equal or relatively well distributed pressurized mass discharge can nevertheless be ensured by the differently dimensioned dispensing slits 66.In the exemplary embodiment according to FIG. 9, at least one dispensing slot 66 of the dispensing device 24 can have a size and / or width that is constant at least in sections along the flow direction 64 of the printing mass 22.Furthermore, it can be provided that the dispensing slots 66 of a dispensing device have different dimensioned slot lengths, which is not shown in more detail here.FIG. 10 shows a detailed view of a dispensing device 24 according to yet another exemplary embodiment of the present invention. The embodiment in FIG. 10 differs from the embodiment in FIG. 9 with regard to the shape of the dispensing slots 66. the different dimensioning of the dispensing slots 66, as described above with reference to FIG. 9, can also be provided in the embodiment according to FIG. 10.In addition, in the exemplary embodiment according to FIG. 10, it can be provided that at least one dispensing slot 66 of the dispensing device 24 has a varying width along the longitudinal extent. This can preferably be provided for all dispensing slots 66.At least one dispensing slot 66 of the dispensing device 24 may have different widths at portions spaced apart from one another in the longitudinal extent of the dispensing slot 66. Preferably, all dispensing slots 66 of the dispensing device 24 can have different widths at portions spaced apart from one another in the longitudinal extent of the respective dispensing slot 66.In this case, at least one dispensing slot 66 of the dispensing device 24 can be dimensioned larger and / or wider in a slot section formed downstream of the pressurized mass 22 in the flow direction 64 than at least one slot section upstream in the flow direction 64. This can in turn preferably be provided for all dispensing slots 66.In the exemplary embodiment according to FIG. 10, at least one dispensing slot 66 of the dispensing device 24 can have a size and / or width which increases continuously at least in sections along the flow direction 64 of the printing mass 22. This can preferably be provided for all dispensing slots 66 of the dispensing device 24 according to FIG. 10.In the exemplary embodiments according to FIGS. 1 to 10 and also in the exemplary embodiments according to FIGS. 11 to 25 explained in more detail below, the dispensing device 24 can have at least one dispensing tube section 68 or a plurality of dispensing tube sections 68.The dispensing devices 24 shown above with reference to FIGS. 8 to 10 can each be formed as a dispensing tube section 68, or a dispensing device 24 can have at least one dispensing tube section 68 formed in accordance with the exemplary embodiments in FIGS. 8 to 10. Similarly, a dispenser 24 may include a plurality of such dispenser tube portions 68.In such a dispensing tube section 68, at least one dispensing opening 62 and / or one dispensing slot 66 or a plurality of dispensing openings 62 and / or dispensing slots 66 can be formed. A dispensing opening 62 provided in a dispensing tube section 68 and / or a dispensing slot 66 provided in a dispensing tube section 68 can be formed as described in greater detail above with reference to FIGS. 8 to 10.In particular, a plurality of discharge openings 62 can be provided in a discharge pipe section 68 and arranged distributed along a flow direction 64 of the pressurized mass 22. Likewise, in a discharge pipe section 68, at least one discharge slot 66 can be formed running in the flow direction of the pressurized mass 22.Likewise, a dispensing tube portion 68 may also have a dispensing opening 62 at a free end. In particular, such a dispensing tube section 68 can also be provided only with a dispensing opening 62 at a free end, as will be described in more detail below.An output tube section 68 described above can extend between the respective flooding squeegee 50 and the respective printing squeegee 52, in particular transversely or at an angle to the squeegee direction 54 and / or parallel to a squeegee edge 56 of the flooding squeegee 50 and / or parallel to a squeegee edge 58 of the printing squeegee 52.As is shown in more detail in FIG. 5, for example, the dispensing device 24 can have a plurality of dispensing tube sections 68, which are preferably aligned with one another. The dispenser 24 may be movably disposed by an actuator 70. In particular, the output tube portions 68 of the output device 24 may be arranged to be uniformly movable with each other by one actuator 70 or by a plurality of actuators.The actuator 70 may be a portal axis system 72, as shown in FIG. 3. A portal axis system 72 can have an electric drive 74, which is shown in more detail in FIG. 11, for example. The portal axis system 72 can also support the flooding squeegee 50 and the printing squeegee 52 and realize a squeegee movement in the squeegee direction 54.In the exemplary embodiments according to FIGS. 1 to 10 and also in the exemplary embodiments according to FIGS. 11 to 33, which will be explained in more detail below, the respective feed line 26 can have at least one distributor 76. Such a distributor 76 can be designed and / or arranged in particular for distributing a pressurized mass flow 22 to a plurality of parallel-connected feed line sections 78 and / or for feeding a pressurized mass flow 22 to a plurality of output openings 62 and / or to a plurality of output slots 66 and / or to a plurality of output tube sections 68.The feed line 26 can therefore have at least two feed line sections 78 connected in parallel by a distributor 76.It is also possible that at least one feed line section 78 of parallel-connected feed line sections 78 has a further distributor 76 for distributing a pressurized mass flow 22 to a plurality of further parallel-connected feed line subsections 78. The respective feed line 26 can therefore have a plurality of distributors 76.By the arrangement of a distributor 76, the feed line 26 can therefore be of branched design. The above-mentioned lengths or length ranges of the feed line 26 can each be a length or a length range of the feed line 26 starting from the respective container 20 up to the end of an individual branch. Likewise, the above-mentioned lengths or length ranges of the feed line 26 can each be a length or a length range of the entire feed line 26, including all branches.FIG. 11 shows a partial view of a printing device 14 and of a metering device 18 according to yet another exemplary embodiment. FIG. 12 shows a sectional illustration along the section line A-A from FIG. 11.It can be seen from FIGS. 11 and 12 in a more detailed illustration that the printing device 14 can have a flooding squeegee 50 for flooding the printing screen 16 with printing composition 22. It can likewise be seen from FIGS. 11 and 12 in a more detailed illustration that the printing device 14 can have a printing squeegee 52 for pressing printing mass 22 through the printing screen 16.Instead of the flooding squeegee 50, a printing squeegee can likewise be provided, or the flooding squeegee 50 can also be operated as a printing squeegee. Consequently, the printing device 14 can be equipped with two printing squeegees or two arranged squeegees can both be operated as a printing squeegee.As is shown in the exemplary embodiment according to FIGS. 11 and 12, the dispensing device 24 can preferably be designed and / or arranged for dispensing the printing mass 22 starting from a position between the flooding squeegee 50 and the printing squeegee 52 or between two printing squeegees. This is illustrated in more detail in FIG. 12. In the following, an arrangement with a flooding squeegee 50 and a printing squeegee 52 will be discussed in more detail, and the respective details also apply to an arrangement with two printing squeegees.The dispensing device 24 can run at least in sections or completely between the flooding squeegee 50 and the printing squeegee 52. In particular, the dispensing device 24 can run at least in sections in a direction transverse or at an angle to the doctor blade direction 54. The doctor blade direction 54 can be a direction along which the flooding doctor blade 50 is moved during flooding of the printing screen 16 or the printing doctor blade 52 is moved during printing or pressing of printing composition 22 through the printing screen 16. A lowering movement or lifting movement of the flooding squeegee 50 and / or of the printing squeegee 52 is therefore not understood as a squeegee direction.The above-described arrangement between an output device 24 and the flooding squeegee 50 and / or the printing squeegee 52 can also be provided in the exemplary embodiments according to FIGS. 1 to 10 and 13 to 25. Otherwise, the doctor blade direction 54 is also drawn in FIG. 3.The dispensing device 24 can furthermore run at least in sections parallel to a doctor edge 56 of the flooding doctor 50. Likewise, the output device 24 can run at least in sections parallel to a squeegee edge 58 of the printing squeegee 52. In this case, the output device 24 can run at least in sections as far as into an intermediate space 60 between the flooding squeegee 50 and the printing squeegee 52. This allows the respective printing paste 22 to be dispensed by the dispensing device 24 from a position within the intermediate space 60 between the flooding squeegee 50 and the printing squeegee 52.During a squeegee movement of the flooding squeegee 50 and / or of the printing squeegee 52 along a squeegee direction 54, in particular in the case of an embodiment according to FIGS. 11 and 12, but also according to FIGS. 1 to 10 and 13 to 25, the output device 24 can be moved together with the flooding squeegee 50 and / or the printing squeegee 52. Such a movement of the dispensing device 24 along the doctoring direction 54 can therefore also take place relative to the respective container 20.Thus, according to an exemplary embodiment of the present invention, as shown for example in FIGS. 1 to 25, the output device 24 can be arranged to travel with the flooding squeegee 50 and / or with the printing squeegee 52, in particular to travel with it in a squeegee direction 54.According to an exemplary embodiment of the present invention, as shown, for example, in FIGS. 1 to 25, the metering device 18 can be configured for dispensing printing mass 22 via the dispensing device 24 during a squeegee movement in a squeegee direction 54. In particular, the metering device 18 can be configured for the continuous and / or periodically recurring dispensing of printing mass 22 via the dispensing device 24 during a squeegee movement in a squeegee direction 54.Furthermore, the metering device 18 according to an exemplary embodiment of the present invention, as shown for example in FIGS. 1 to 25, can be configured for dispensing printing mass 22 during a joint and / or moving movement of the dispensing device 24 with a flooding squeegee 50 and / or with at least one printing squeegee 52 in a squeegee direction 54, in particular from a position of the dispensing device 24 moving along and / or moving along in the squeegee direction between a flooding squeegee 50 and a printing squeegee 52 and / or between two printing squeegees.In this case, the metering device 18 according to an exemplary embodiment of the present invention, as shown for example in FIGS. 1 to 25, can be configured for dispensing printing mass 22 during a squeegee movement along the squeegee direction 54 carried out by the actuator 70 and / or by the portal axis system 72.Finally, the metering device 18 according to an exemplary embodiment of the present invention, as shown for example in FIGS. 1 to 25, can be configured for dispensing printing mass 22 during a stationary position of a printing squeegee 52 and / or of a flooding squeegee 50 that is stationary and / or at a standstill in the squeegee direction 54.Additionally or alternatively, the metering device 18 according to an exemplary embodiment of the present invention, as shown for example in FIGS. 1 to 25, can be configured for dispensing printing mass 22 during a movement of the dispensing device 24 relative to a flooding squeegee 50 and / or relative to a printing squeegee 52 and / or during a movement between a flooding squeegee 50 and a printing squeegee 52 and / or for dispensing printing mass 22 during a movement of the dispensing device 24 transversely or at an angle to the squeegee direction 54, In particular, in the stationary position and / or in the doctor direction 54 the stationary position of a printing doctor 52 and / or of a flooding doctor 50 Fig. 13 shows a detailed view of a dispensing device 24 according to the exemplary embodiment in Figs. 11 and 12 In particular, the detailed view according to Fig. 13 shows a dispensing subassembly 25 of the dispensing device 24.The dispensing device 24 or the dispensing subassembly 25 according to FIG. 13 has two dispensing tube sections 68 which run parallel to one another or next to one another at least in sections. The parallel or adjacently arranged course of the two output pipe sections 68 can be overlapping. Consequently, the two output tube sections 68 can only extend in sections parallel or next to one another. One of the output tube portions 68 may protrude along a longitudinal direction or be longer than the respective other output tube portion 68.The discharge pipe sections 68 according to FIG. 13 can each be supplied with pressurized mass 22 from a feed pipe section 78, wherein the feed pipe sections 78 a, 78 bdirectly adjoining the discharge pipe sections 68 are connected in parallel and connected to the distributor 76. The flow direction 64 of the pressurized mass 22 is schematically indicated in FIG. 13.Upstream of the distributor 76, a feed line section 78 cmay again run, which may preferably likewise be connected in parallel and may be connected to a further distributor 76, not shown in detail here. The parallel connection of the feed line section 78 cmay be effected with a further feed line section 78, likewise not shown in more detail here.A metering device 18 or a dispensing device 24 according to the exemplary embodiment in FIGS. 11 and 12 can therefore have, for example, two dispensing subassemblies 25 each having two parallel-connected dispensing tube sections 68, as shown, for example, in FIG. 13. Thus, a dispensing device 24 can have two dispensing subassemblies 25 lying opposite one another, which can be configured, for example, in each case according to FIG. 13 and can consequently have in each case two parallel-connected dispensing tube sections 68.The dispensing tube sections 68 shown in FIG. 13 can furthermore each have a dispensing opening 62 at their free end 69. In particular, the dispensing tube sections 68 according to the exemplary embodiment in FIG. 13 can have a dispensing opening 62 exclusively at the free ends 69.In the embodiment according to FIGS. 11 to 13, the metering device 18 can furthermore have at least one actuator 142 for moving the dispensing device 24 or the dispensing subassemblies 25, as shown for example in FIG. 13, relative to the flooding squeegee 50 and / or relative to the printing squeegee 52. In this case, the metering device 18 according to FIGS. 11 to 13 can be designed and / or arranged for dispensing pressurized mass 22 during a movement of the dispensing device 24 or of the dispensing subassemblies 25 by means of the actuator 142.Furthermore, a separate actuator can be provided for each output subassembly 25, which is not shown in more detail here. As a result, the output subassemblies 25 can be moved independently of one another and / or in opposite directions with respect to one another.The actuator 142 can be designed and / or arranged for moving the dispensing device 24 and / or the dispensing sub-arrangements 25 transversely or at an angle to the doctor blade direction 54. In particular, the actuator 142 can be configured to move the dispensing device 24 along a transverse direction 144 which runs transversely or at an angle to the doctor blade direction 54. In this case, the actuator 142 can be designed and / or arranged for moving the output device 24 along the intermediate space 60 between flooding squeegee 50 and printing squeegee 52 and / or in a direction parallel to a squeegee edge 56 of the flooding squeegee 50 and / or parallel to a squeegee edge 58 of the printing squeegee 52.The actuator 142 can be designed as a pneumatic and / or electrical actuator and / or as a linear actuator, in particular as a pneumatic and / or electrical linear actuator.The actuator 142 can be designed and / or arranged to move the respective dispensing subassembly 25 along a transverse direction 144, in particular by a distance or metering length which is less than 50% of the doctor blade width extending in the transverse direction 144. The actuator 142 can furthermore be designed and / or arranged to move the respective dispensing subassembly 25 along a transverse direction 144 by a distance or metering length which is less than 30% and / or more than 20%, preferably 25% or about 25%, of the doctor blade width extending in the transverse direction 144.A printing composition 22 can therefore be dispensed from one of the dispensing tube sections 68 along a metering length or along a distance which corresponds to approximately 25% or approximately 25% of the doctor blade width extending in the transverse direction 144. By arranging a total of two mutually opposite dispensing subassemblies 25 and thus a total of four dispensing tube sections 68, the entire doctor blade width extending in the transverse direction 144 can be covered.Thus, due to the movement by means of the actuator 142, a partial printing mass portion can be applied to the respective printing screen 16 through each dispensing tube portion 68 along a metering width and / or distance which corresponds to about 25% or about 25% of the doctor blade width extending in the transverse direction 144.Four partial printing mass sections applied in this way via the respective output tube sections 68 can supplement one another to form a continuous printing mass section 122, as shown for example in FIG. 25. Such a continuous printing mass section 122 can therefore extend along the entire or substantially the entire doctor blade width, wherein the doctor blade width in turn extends in the transverse direction 144.The actuator 144 can perform forward and backward movements along the squeegee direction 144, wherein, for example, during a forward movement, the printing compound 22 can be discharged from the discharge tube sections 68 of a discharge subassembly 25 and, during a backward movement, the printing compound 22 can be discharged from the discharge tube sections 68 of the respective other discharge subassembly 25. The forward and rearward movements along the doctor blade direction 144 take place to the left and to the right in the illustration according to FIG. 11.If a plurality of actuators are provided or the actuator 144 has a plurality of individual actuators-not illustrated in more detail here-the output sub-arrangements 25 can be moved towards one another and / or moved away from one another during the output of the printing mass 22.FIG. 14 shows a perspective view of a dosing device 18 according to a further exemplary embodiment of the present invention and FIG. 15 shows a side view of the dosing device 18 from FIG. 14. In the exemplary embodiment according to FIGS. 14 and 15, the dispensing device 24 can have a plurality of dispensing tube sections 68, which can be connected to one another to form a dispensing tube 80 and / or can be formed integrally with one another as a dispensing tube 80.The output tube sections 68 according to FIGS. 14 and 15 can also be in fluid communication with one another. It is possible for the pressurized mass 22 to be introduced via opposite ends 82 into the two output pipe sections 68 connected to one another. Via dispensing openings 62 or one dispensing slot 66 or a plurality of dispensing slots 66 between the opposite ends 82, the printing compound 22 can be dispensed. Within the output tube sections 68 connected to one another or formed integrally with one another, it is therefore possible to realize counter-rotating pressurized mass flows.Counter-rotating pressurized mass flows can meet approximately centrally of the discharge tube having the discharge tube sections 68.FIG. 16 shows a perspective view of a device 10 according to the invention according to a further exemplary embodiment. FIG. 17 shows a sectional representation of the device 10 from FIG. 16 and FIG. 18 shows a side view of the device 10 from FIG. 16.The embodiment of the device 10 according to FIGS. 16 to 18 differs from the embodiment according to FIGS. 1 to 7 again with respect to the metering device 18. FIG. 19 shows a perspective view of a metering device 18 of the device 10 from FIGS. 16 to 18 and FIG. 20 shows a side view of the metering device 18 from FIG. 19.The dosing device 18 illustrated in FIGS. 18 and 19 has a container 20 which can be designed as a bucket 84. Furthermore, the metering device 18 according to FIGS. 18 and 19 has a pressure increasing device 86 with a pressure container 88, which can be closed in a pressure-tight manner.The container 20, which is designed as a bucket 84, for storing the pasty pressurized mass 22 is arranged in the pressure container 88 of the pressure increasing device 86. Thus, the container 20 designed as a bucket 84 is only indicated in FIGS. 18 and 19, but is not shown in more detail.In the broader sense or in the sense of the present invention, the pressure-increasing device 86 can likewise be an actuator 40 for conveying the pressurized mass 22 from the container 20.A container 20 designed as a bucket 84 for storing the pasty printing compound 22 can be taken from the exemplary embodiment in FIGS. 21 and 22, which will be discussed in greater detail below.A container 20 designed as a bucket 84 can be equipped with a cylindrically or conically encircling side wall 90 and / or with an opening 92 designed and / or closable on the top side. Likewise, a container 20 designed as a bucket 84 can also be provided with a pressurized mass outlet designed on the underside, which is not shown in more detail here.In the embodiment according to FIGS. 16 to 19, the pressure vessel 88 can have a connection opening 94 for supplying compressed air. A compressed air line 96 can be connected or connectable to the connection opening 94 in a pressure-tight manner. The connection opening 94 is preferably formed in a cover 98 of the pressure vessel 84.The pressure vessel 88 further has an outlet opening 100 for the passage of the feed line 26 or an outlet opening 100 for the passage of an outlet line 102 connected to the feed line 26, wherein the outlet opening 100 can preferably be formed in the lid 98 of the pressure vessel 88.The feed line 26 or an outlet line 102 connected to the feed line 26 can be led through the outlet opening 100 as far as into the interior of the pressure vessel 88, in particular as far as into the vessel 20 positioned in the pressure vessel 88 and filled with pressurized mass 22, which can in the present case preferably be designed as a bucket 84.By supplying compressed air via the compressed air line 96 and the connection opening 94, a pressure increase can be generated within the pressure vessel 88, which pressure increase acts on the pressurized mass 22 in the vessel 20. As a result, the printing mass 22 in the container 20, which is arranged in the pressure container 88, can be pressed out of the pressure container 88 via an outlet line 102 and conveyed into the feed line 26 and further up to the output device 24, through which the printing mass 22 can be output onto a printing screen 16.As can be seen from FIG. 17, the apparatus 10 can have a plurality of metering devices 18 and / or the metering device 18 can have a plurality of pressure increasing devices 86 or a plurality of pressure vessels 88.FIG. 21 shows a perspective view of a dosing device 18 according to a further exemplary embodiment of the present invention and FIG. 22 shows a side view of the dosing device 18 from FIG. 21 As already mentioned above, according to the embodiment in FIGS. 21 and 22, the container 20 of the dosing device 18 can be designed as a bucket 84.In the exemplary embodiment according to FIGS. 21 and 22, the metering device 18 can have an actuator 40 for conveying the printing mass 22, wherein the actuator 40 can be designed as a suction device 104 for sucking the printing mass 22 out of the container 20. The suction device 104 can be designed in particular as a worm pump and / or eccentric worm pump.The suction device 104 can be immersed and / or can be arranged such that it can be immersed at least in sections in the container 20 and / or in the printing mass 22 located in the container 20. For this purpose, a relative movement between the suction device 104 and the container 20 can be realized, for example by a lifting device for the container 20.The suction device 104 can also be arranged outside the container 20 and / or be in fluid communication with the container 20 via a suction line-not shown in detail here. Likewise, an intake line connected to the suction device 104-also not shown in detail here-can be immersed in the container 20 and / or in the printing mass 22 located in the container 20.The suction device 104 can be designed and / or arranged in particular to transport pressurized mass 22 sucked in from the container 20 into the feed line 26 and up to the output device 24, through which a discharge of pressurized mass 22 onto the respective printing screen 16 can finally take place.In the embodiment of Figures 21 and 22, the dispenser 24 may include a plurality of dispensing apertures 62 formed at free conduit ends 106. The free line ends 106 can each be formed on a line end section 108, which is in fluid communication with the supply line 26 or can be formed as part of the supply line 26.The container 20 designed as a bucket 84, as used in the embodiments according to FIGS. 16 to 21, can have a holding volume of at least 1 dm 3, preferably of at least 3 dm 3, further preferably of at least 4 dm 3, further preferably of at least 5 dm 3, further preferably of at least 7 dm 3, further preferably of at least 9 dm 3, further preferably of at least 10 dm 3, further preferably of at least 15 dm 3, further preferably of at least 20 dm 3, even further preferably of at least 25 dm 3 and even further preferably of at least 35 dm3.Likewise, the container 22 designed as a bucket 84, as used in the embodiments according to FIGS. 16 to 21, can have a holding volume of up to 5 dm 3, preferably of up to 7 dm 3, more preferably of up to 9 dm 3, more preferably of up to 10 dm 3, more preferably of up to 15 dm 3, more preferably of up to 20 dm 3, more preferably of up to 25 dm 3, more preferably of up to 30 dm 3, more preferably of up to 35 dm 3, more preferably of up to 45 dm 3, still more preferably up to 50 dm 3 and even more preferably up to 100 dm 3.FIG. 23 shows a perspective partial view of the metering device 18 from FIG. 22 with the illustrated dispensing device 24 and the illustrated printing screen 16. FIG. 24 shows a lateral detailed view of the dispensing device 24 from FIG. 21 with the illustrated flooding squeegee 50 and printing squeegee 52. The line end sections 108 project into the intermediate space 60 between the flooding squeegee 50 and the printing squeegee 52, with the result that the output openings 62 at the free line ends 106 are also arranged in the intermediate space 60. The dispensing openings 62 can be distributed in the intermediate space 60, namely in a direction transverse to the doctor blade direction 54.FIG. 25 shows a plan view of a printing screen 16 of an apparatus 10 according to the invention in accordance with an exemplary embodiment of the present invention. The pressure screen 16 has a closed section 110 and an open section 112. A pasty printing compound 22 can be pressed through the open section 112 at least in sections, namely to produce printing layers with the respectively desired shape. The closed section 110 surrounds the open section 112 and, on the other hand, does not allow printing compound 22 to be pressed through.The dispensing device 24 can be configured in a preferred manner for dispensing the printing mass 22 onto a closed section 110 of the printing screen 16. In particular, the dispensing device 24 can be designed in a preferred manner for dispensing the printing compound 22 onto a pressure overflow section 114 of the printing screen 16. The pressure overflow section 114 can be arranged in particular at a distance from the open section 112 and / or on the closed section 110. The flooding squeegee 50 to be inserted in each case and / or the printing squeegee 52 to be inserted in each case can be moved at least as far as into the print overflow section 114 when a squeegee movement is carried out in a squeegee movement direction 54.Preferably, a pressure overflow section 114 can be provided on both sides of the open section 112, as seen in plan view according to FIG. 25.A metering position 116 for the discharged printing mass 22 on the printing screen 16 is illustrated in FIG. 25. The metering position 116 is arranged in the pressure overflow section 114, in particular at a distance from the open section 112 and / or on the closed section 110 of the pressure screen 16.Furthermore, a flooding squeegee start position 118 is illustrated in FIG. 25. In the plan view according to FIG. 25, the metering position 116 can be arranged in particular between the open section 112 and the flooding squeegee start position 118.Finally, a secure doctor blade position 120 is shown in FIG. 25. The secure squeegee position 120 is located above or on a closed section 110 of the printing screen. In this case, as seen in the plan view according to FIG. 25, the open section 112 can be arranged between the metering position 116 and the secure doctor blade position 120. Such a secure squeegee position 120 can be advantageous in particular when a movement of the output device 24 takes place independently or by means of its own actuator and relative to the flooding squeegee 50 and / or relative to the printing squeegee 52. By positioning the flooding squeegee 50 and / or the printing squeegee 52 in a secure squeegee position 120, metering of printing composition 22 can be carried out on the metering position 116 or along the metering position 116 without risk of collisions.The dispensing device 24 can be designed and / or arranged in particular to carry out the dispensing of the printing compound 22 onto the printing screen 16 in at least one longitudinally extended or line-shaped printing compound section 122. Such a line-shaped printing mass section 122 can be seen, for example, from FIG. 25. A string-shaped ink composition portion 122 may be formed, for example, by a dispenser 24 having a dispensing slot 66.FIG. 26 shows a side view of a container changing device 124 according to an exemplary embodiment of the present invention in a first operating position. A further operating position of the container changing device 124 is shown in FIG. 27. A container changing device 124 can be designed and / or arranged as part of a dosing device 18.The container changing device 124 can be designed and / or arranged for the automated changing of the container 20 dispensing the respective printing compound 22, in particular of a container 20 designed as a cartridge 34. Likewise, a container changing device 124 can also be designed and / or arranged for the automated changing of a container 20 designed as a bucket 84, which is not shown in more detail here.Additionally or alternatively, the container changing device 124 can be designed and / or arranged for the tool-free and / or automated or semi-automated changing of the container 20 dispensing the respective printing compound 22.The container changing device 124 can have a container magazine 126 for receiving a plurality of containers 20. The container magazine 126 can be designed in particular as a cartridge magazine for receiving a plurality of containers 20 designed as cartridges 34.The container change device 124 can further comprise a connection plate 128, which can be equipped with a passage 130 for the passage of pressurized mass 22 from a container 20. A feed line 26, not shown in detail here, can be connected to the passage 130.The container magazine 126 can be arranged movably or displaceably relative to the connection plate 128, as is schematically illustrated in FIGS. 26 and 27. Likewise, the connection plate 128 could also be arranged movably or displaceably relative to the container magazine 126.The outlet opening 35 of a cartridge 34 can be brought into fluid communication with the passage 130 of the connection plate 128, in order thereby to enable a discharge of printing compound 22 from this cartridge 34. In FIG. 26, the outlet opening 35 of the cartridge 34, shown on the left, is in fluid communication with the passage 130 of the connection plate 128.FIG. 27 shows a side view of the container changing device 124 from FIG. 26 in a further operating position. In FIG. 27, the container magazine 126 has been displaced relative to the connection plate 128, so that the outlet opening 35 of the cartridge 34, shown on the right, is now in fluid communication with the passage 130 of the connection plate 128. The two further cartridges 34 according to FIG. 27 may have been emptied, for example.Consequently, depending on a relative position between the connection plate 128 and the plurality of containers 20, in particular the cartridges 34, a fluid connection can be produced between the supply line 24-not shown in more detail here-and one of the plurality of containers 20, in particular cartridges 34. By adjusting the relative position between the connection plate 128 and at least one container 20, in particular cartridge 34, a fluid connection can be produced between the supply line 24 and a further container 20, in particular cartridge 34.FIGS. 26 and 27 schematically show a plunger 48 or also a linear drive 44. The plunger 48 can be part of the linear drive 44 or can be connected to the linear drive 44 for transmitting a driving force. The plunger 48 is intended to contact and move a piston crown, not shown in more detail here, of the respective cartridge 34.Further detailed views of the container changing device 124 are shown in FIGS. 28 and 29. The piston crown 38 of the cartridges 34 is shown in more detail in FIG. 28. In addition, FIGS. 28 and 29 show the closer reception of the cartridges 34 in the container magazine 126.FIGS. 26 and 27 also show a schematically illustrated fill level sensor 132, by means of which a fill level of the printing composition 22 in the respective cartridge 34 can be determined.A dosing device 18 according to an exemplary embodiment of the present invention can furthermore have a receiving cavity 134 for receiving a cartridge 34, wherein the receiving cavity 134 can preferably be designed for the support, at least in sections, of a cartridge side wall 36 laterally and / or circumferentially. In the exemplary embodiment according to FIGS. 26 to 29, the receiving cavity 134 or the plurality of receiving cavities 134 is provided in the container magazine 126.Likewise, in the exemplary embodiment shown in FIG. 7, a receiving cavity 134 for a cartridge 34 can be removed.In FIGS. 28 and 29, a quick-change device 127 for the container magazine 126 is also shown. The quick-change device 127 can have fastening elements 127 that can be actuated manually and / or without tools. By means of the fastening elements 127, a support plate 131 of the container magazine 126 can be clamped in or fixed in an operating position, as shown in FIGS. 28 and 29. By manually or without tools releasing the fastening elements 127, a support plate 131 of the container magazine 126 can be removed from the device 10 and another container magazine 126 can in turn be inserted and clamped or fixed. As a result, it is possible to remove containers 20 emptied in groups with only little effort and these can in turn be replaced by a newly equipped container magazine 126 with a plurality of fully or newly filled containers 20.FIG. 30 shows a side view of a metering device 18 according to an exemplary embodiment of the present invention. The dosing device 18 shown in FIG. 30 can be equipped with a container changing device 124, as has been shown in more detail in FIGS. 26 to 29 and described above.The container changing device 124 can be arranged in particular outside the pressure region 30 of the pressure device 14. Furthermore, the container changing device 124 can be arranged spaced apart in the horizontal direction relative to the printing screen 16. Likewise, the container changing device 124 can be arranged below a printing table of the printing device 14 in the vertical direction, which is not shown in more detail here.The feed line 24 can be arranged and / or designed such that it can be exchanged and / or replaced in a tool-free and / or automated or partially automated manner.The dosing device 18 according to FIG. 30 can have at least one actuator 136 for moving the dispensing device 24. The actuator 136 can be designed and / or arranged in particular for moving the dispensing device 24 transversely or at an angle to the doctor blade direction 54. The doctor blade direction 54 runs orthogonally to the plane of the drawing in the illustration according to FIG. 30. Consequently, in the exemplary embodiment according to FIGS. 30 and 31, a movement of the dispensing device 24 can take place via the actuator 136 independently of a movement of the flooding squeegee 50 and / or of the printing squeegee 52.FIG. 31 shows a side view of the metering device 18 from FIG. 30 during the dispensing of the printing mass 22 onto the printing screen 16. In this way, a line-shaped printing mass section 122 can also be produced, namely due to the dispensing device 24 moving during the printing mass dispensing.During the dispensing of the printing mass 22 and the movement of the dispensing device 24 by the actuator 136, the flooding squeegee 50 and the printing squeegee 52, not shown in detail here, can be positioned in a secure position or at a distance from the actuator 136, as already explained with reference to FIG. 25.FIG. 32 shows a side view of the metering device 18 of FIG. 30 during flooding of the printing screen 16 by a flooding squeegee 50 or by a flooding squeegee movement in the squeegee direction 54.Thus, the actuator 136 may be configured to move the dispenser 24 from a waiting position, as shown in FIG. 32, to a dispensing position, as shown in FIG. 31. Similarly, the actuator 136 may be configured to move the dispenser 24 from a dispensing position, as shown in FIG. 31, to a waiting position, as shown in FIG. 32.FIG. 33 shows a side view of the dosing device 18 from FIG. 30 after the container has been changed by the container changing device 136. After the container has been changed, printing compound 22 can now be discharged from container 20, in particular cartridge 34, shown on the right, in FIG. 30.A container change can be carried out when the container 20 is emptied and / or when the printing mass 22 to be used is changed in a desired or planned manner. After or together with a container change, the feed line 24 and / or the connection plate 128 and / or the plunger 48 and / or any further component coming into contact with printing compound 22 can also be exchanged and / or cleaned in order to avoid contamination with a previously used printing compound 22.In all or at least some exemplary embodiments, as described above with reference to FIGS. 1 to 33, the metering device 18 can have at least one shut-off valve 138 for shutting off a pressurized mass flow. The shut-off fitting 138 can preferably be designed as part of the feed line 24 and / or for shutting off the feed line 24.Such a shut-off valve 138 can be designed in particular as a shut-off valve, as a shut-off valve and / or as a throttle valve, as a shut-off valve and / or as a shut-off flap. Such a shut-off fitting 138 can be actuatable in particular mechanically and / or pneumatically and / or electrically and / or manually and / or automatically and / or remotely. Such a shut-off fitting 138 can be designed in particular as a pinch valve.In all or at least some exemplary embodiments, as described above with reference to FIGS. 1 to 33, the distance of the shut-off fitting 138 from the container 20 with pressurized mass 22 can be greater along the course of the feed line 24 than the distance of the shut-off fitting 138 from the dispensing device 24 and / or from at least one dispensing opening 62 and / or one dispensing slot 66 of a dispensing device 24.Furthermore, in all or at least some exemplary embodiments, as described above with reference to FIGS. 1 to 33, the metering device 18 and / or the actuator f can be configured to convey the printing mass 22 from the container 20 for volumetric metering of the printing mass 22.Furthermore, in all or at least some exemplary embodiments, as described above with reference to FIGS. 1 to 33, the metering device 18 and / or the respective actuator 40 can be configured for conveying the printing mass 22 for stroke-based and / or volumetric metering of the printing mass 22. Additionally or alternatively, an actuator 40 can be designed to convey the pressurized mass 22 for volumetric metering by means of stroke control.Furthermore, in the exemplary embodiments, as described above with reference to FIGS. 1 to 25, the actuator 70 for moving the output device 24 can be configured as a portal axis system 72, as shown in more detail in FIGS. 3, 10 and 11, or as part of a portal axis system 72. Such a portal axis system 72 can be equipped with an electric drive 74, and the portal axis system 72 can support the flooding squeegee 50 and the printing squeegee 52 and realize a squeegee movement in squeegee direction 54, as described above.The drive 74 can be provided for carrying out the squeegee movement in the squeegee direction 54. In such an embodiment, the movement of the output device 24 along the doctor blade direction 54 takes place together with the flooding doctor blade 50 and / or with the printing doctor blade 52.The flooding squeegee 50 and / or the printing squeegee 52 can be lowerable relative to the portal axis system 72 into a squeegee position and / or can be raised again from a squeegee position relative to the portal axis system 72. The lowering and raising of the flooding squeegee 50 and / or the printing squeegee 52 is effected with separate drives and in a direction transverse or at an angle to a horizontal plane.The portal axis system 72, as shown in more detail in FIGS. 3, 10 and 11, can be configured such that a movement of the flooding squeegee 50 and / or of the printing squeegee 52 and / or of the output device 24 along a horizontal plane is made possible only in the squeegee direction 54. The portal axis system 72 can be designed in particular free of further movement axes along a horizontal plane, in particular free of movement axes which extend along a horizontal plane and transversely or at an angle to the doctor blade direction 54.Furthermore, in all or at least some exemplary embodiments of the apparatus 10, as described above with reference to FIGS. 1 to 33, the respective metering device 18 can have a run-on stop apparatus 140 for preventing and / or reducing run-on of printing mass 22 from the dispensing apparatus 24.In all or at least some exemplary embodiments, as described above with reference to FIGS. 1 to 33, the run-on stop device 140 can be formed by a shut-off valve 138 and / or comprise the shut-off valve 138.Furthermore, the run-on stop device 140, in particular in the form of a shut-off valve 138, can preferably be designed as a shut-off valve, as a shut-off valve and / or as a throttle valve, as a shut-off valve and / or as a shut-off valve, or can have such a component.Additionally or alternatively, the run-on stop device 140, in particular in the form of a shut-off fitting 138 or having such a shut-off fitting 138, can be actuated mechanically and / or pneumatically and / or electrically and / or manually and / or automatically and / or remotely. Such a run-on stop device 140, in particular in the form of a shut-off fitting 138, can finally be designed as a pinch valve or have a pinch valve.Additionally or alternatively, the run-on stop device 140 can be designed to relieve pressure from a piston head 38 of a cartridge 34. Furthermore, the follow-up stop device 140 can be designed to reverse the movement of a piston head 38 of a cartridge 34 and / or to reverse the movement of the actuator 40 for conveying the printing mass 22.The run-on stop device 140 can be designed to cancel, in particular temporarily cancel, the active engagement and / or contact between the actuator 40 for conveying the printing mass 22 and the piston crown 38 of a cartridge 34. In particular, the run-on stop device 140 can be designed to cancel, in particular temporarily cancel, the operative engagement and / or contact between the linear drive 44 and / or the plunger 48 on the one hand and the piston crown 38 of a cartridge 34 on the other hand.For this purpose, the run-on stop device 140 can be formed in particular by the actuator 40 or by a control and / or regulation of the actuator 40 not shown in detail here, or can have the actuator 40 or a control and / or regulation of the actuator 40 not shown in detail here.By cancelling the contact between the actuator 40 and the piston crown 38 of a cartridge 34, in particular between the linear drive 44 and / or the plunger 48 on the one hand and the piston crown 38 of a cartridge 34 on the other hand, a pressure relief can be generated in the cartridge 34. The pressure relief in the cartridge 34 can lead to a release of the pressurized mass 22 within the cartridge 34 and / or within the downstream supply line 24.The piston crown 38 can subsequently execute a restoring movement, in particular a self-sustained restoring movement. As a result, an undesired running-on of printing mass 22 can be reliably prevented or reduced.The run-on stop device 140 can additionally or alternatively have a pressure-based control and / or be designed to avoid and / or reduce running-on of printing mass 22 from the output device 24 by a pressure-based control. Such pressure-based control may be provided in the dispensers 18 of all or some embodiments as described above with reference to Figures 1 to 33.Such a pressure-based regulation of the run-on stop device 140 can be configured in a particularly advantageous manner for detecting and / or processing a delivery pressure and / or fluid pressure of the pressurized mass 22 and / or a pressure generated by an actuator 40 for delivering the pressurized mass 22 and / or acting on a piston crown 38 of a cartridge 34 and / or a pressure prevailing within a pressure container 88.According to one exemplary embodiment, a pressure sensor, not shown in detail here, can be provided, for example in the feed line 26 and / or in the container 20 and / or in and / or on the output device 24 and / or in a pressure container 88.Likewise, a pressure sensor, not shown in detail here, can be provided on the plunger 48 and / or on the piston crown 38 of a cartridge 34, by way of which a pressure between the plunger 48 and the piston crown 38 of a cartridge 34 can be determined.Likewise, a pressure sensor, not shown in detail here, can be provided in a pressure vessel 88 of a pressure increasing device 86, by way of which a gas pressure in the pressure vessel 88 can be determined. Likewise, a pressure sensor, not shown in detail here, can be provided in the compressed air line 96 and / or in and / or at the connection opening 94 of the pressure vessel 88, by way of which a gas pressure in the compressed air line 96 and / or in and / or at the connection opening 94 of the pressure vessel 88 can be determined.To avoid a run-on of pressurized mass 22 from the output device 24, the run-on stop device 140 can actuate and / or actuate the respective actuator 40 as a function of the pressure determined by the respective pressure sensor, in particular the respective fluid pressure, delivery pressure and / or gas pressure.If a relatively high pressure is determined by the sensor and the dispensing of printing mass 22 by the dispensing device 24 is to be ended, the respective actuator 40 can be controlled rapidly and / or to a relatively large extent in order to reduce a delivery pressure of the printing mass 22. If necessary, a delivery pressure of the pressurized mass 22 can also be completely reduced by appropriate actuation of the respective actuator. It is likewise possible to reduce the respective delivery pressure of the printing mass 22 only partially, in particular to reduce it in a pressure-controlled manner using pressure sensor data.An unnecessarily strong reduction of the delivery pressure can be avoided in this way, so that for a delivery of pressurized mass 22 from the delivery device 24 in a subsequent delivery sequence, an only relatively small increase of the delivery pressure by the respective actuator 40 is required. The response behavior and / or the accuracy of the dosing device 18 can thereby be further improved.It is likewise possible to actuate the respective actuator for generating a negative delivery pressure or for sucking in the pressurized mass 22 in an opposite flow direction. The printing mass 22 can thereby be conveyed in a flow direction opposite to the dispensing of the printing mass 22 via the dispensing device 24, and therefore away from the dispensing device 24.For example, the plunger 48 can be positively engaged with the piston crown 38 of a cartridge, so that the piston crown 38 can also be moved together with the plunger via an upward movement or a rearward movement of the plunger 48 opposite the application of pressurized mass 22 from the cartridge. As a result, a negative delivery pressure or a suction of the printing mass 22 from the feed line 26 and thus also from the dispensing device back into the cartridge 34 can be effected in a cartridge 34.A pressure-based regulation of the run-on stop device 140 can be provided in particular additionally or alternatively to a shut-off fitting 138 for preventing and / or reducing run-on of the pressurized mass 22.The dispensing device 24 can finally have a stripping device, not shown in detail here, for stripping printing compound 22 from a dispensing opening 62 and / or from a dispensing slot 66. If a run-on cannot be completely avoided, residues of printing compound 22 can thereby be reliably removed from the respective dispensing opening 62 and / or the respective dispensing slot 66 of the dispensing device 24, so that uncontrolled dripping and associated contamination of device components can be avoided.In a method according to the invention for producing three-dimensional screen-printed workpieces, in particular with an apparatus 10 described above, a screen-printed workpiece can be produced in layers in the printing device 14 with the printing screen 16 in a plurality of printing processes. Furthermore, in the method with the metering device 18, a pasty printing material 22 can be dispensed in a metered manner onto the printing screen 16, wherein a printing material 22 is conveyed out of a container 20 for storing the pasty printing material 22 by means of the metering device 18 and is conveyed through the respective feed line 26 as far as a dispensing device 24 for dispensing the printing material 22 onto the printing screen 22.Additionally or alternatively, in a method according to the invention for producing three-dimensional screen-printed workpieces, in particular with an apparatus 10 described above, a screen-printed workpiece can be produced layer by layer in a plurality of printing processes in a printing device 14 having a printing screen 16. Furthermore, in the method, a pasty printing mass can be dispensed in a metered manner onto the printing screen 16 using a metering device 18, it being possible for a run-on of printing mass 22 from the metering device 18 to be prevented or reduced by means of a run-on stop device 140.FIG. 34 shows a further perspective view of a metering device according to the exemplary embodiment of FIGS. 14 and 15. FIG. 35 shows a detailed view of FIG. 34.In the exemplary embodiment according to FIGS. 14 and 15 and also 34 and 35, the feed line 26 can have a return stop device 146 for preventing and / or reducing the return of pressurized mass 22 counter to an output flow direction 148. The return stop device 146 can preferably be designed as a shut-off fitting 150, in particular as a ball valve.Such a shut-off valve 150 can therefore be manually actuatable. The shut-off valve 150 can likewise also be designed as an automatically actuated or actuatable shut-off valve.By means of such a configuration, a return of the pressurized mass 22, for example due to an elastic deformation of the feed line 26 or an internal prestress of the pressurized mass 22 present in the feed line 26, can be reliably prevented. It can thereby be avoided that the printing compound 22 in the feed line 26 flows back in the direction of the container 20 or in the direction of the cartridge 34 and is forced out of a container-side end of the feed line 26 when the respective cartridge 34 is changed within the feed line 26. The return stop device 146 can be actuated in a preferred manner before the respective container 20 is changed, in particular can be actuated manually or automatically or partially automatically.Furthermore, along the course of the feed line 26, the distance of the return stop device 146 from the container 20 with pressurized mass 22 can be less than the distance of the return stop device 146 from the dispensing device 24. With a small distance between the return stop device 146 and the container 20, the risk is reduced that an internal tension of the pressurized mass 22 present between the container 20 and the return stop device 146 in the feed line 26 or a flexible deformation of the feed line 26 causes an uncontrolled return and a emergence of pressurized mass 22 from the container-side end of the feed line 26.Furthermore, the feed line 26 between the container 20 and the return stop device 146 can be designed at least in sections as a rigid or inflexible line. In FIGS. 34 and 35, the feed line 26 running between the container 20 and the return stop device 146 is partially covered by the enclosure shown. Furthermore, the feed line 26 between the return stop device 146 and the dispensing device 24 can be designed at least in sections as a flexible or flexibly deformable line.The device 10 can be designed and / or configured in particular for the development and / or for the production of large numbers of medicaments. Also, a method for producing a large quantity of medicines as described above can be carried out.LIST OF REFERENCE CHARACTERS10 Device 12 Housing 14 Printing device 16 Printing screen 18 Metering device 20 Container 22 Printing composition 24 Dispensing device 25 Dispensing subassembly of the dispensing device 26 Feed line 28 Housing 30 Printing region 32 Printing table 34 Cartridge 36 Cartridge side wall 38 Piston crown 40 Actuator for conveying the printing composition 22 42 Pressure increasing device 44 Linear drive 46 Sensor 48 Plunger 50 Flow squeegee 52 Printing squeegee 54 Squeegee direction 56 Squeegee edge of the flow squeegee 50 58 Squeegee edge of the printing squeegee 52 60 Intermediate space 62 Dispensing opening 64 Flow direction of the printing composition 22 66 Dispensing slot 68 Dispensing tube section 69 Free end of the dispensing tube section 70 Actuator 72 Portal axis system 74 Drive 76 Distributor 78 Feed line section 80 Dispensing tube 82 Ends 84 Bucket 86 Pressure increasing device 88 Pressure container 90 Side wall 92 Opening 94 Connection opening 96 Compressed air line 98 Cover 100 Outlet opening 102 Outlet line 104 Suction device 106 Free line end 108 Line end section 110 Closed section 112 Open section 114 Pressure overflow section 116 Metering position 118 Flooding squeegee start position 120 Secure squeegee position 122 Printing mass section 124 Container changeover device 126 Container magazine 127 Quick changeover device 128 Connection plate 129 Fastening element 130 Passage 131 Support plate 132 Fill level sensor 134 Receiving cavity 136 Actuator 138 Shut-off fitting 140 After-run stop device 142 Actuator 144 Transverse direction 146 Return stop device 148 Outlet flow direction 150 Shut-off fitting

Claims

Device (10) for producing three-dimensional screen-printed workpieces, in particular 3D screen-printing plant, having a printing device (14) which has a printing screen (16) for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes, and having a metering device (18) for the metered dispensing of a pasty printing compound (22) onto the printing screen (16), wherein the metering device (18) has at least one container (20) for storing the pasty printing compound, a dispensing device (24) for dispensing the printing compound (22) onto the printing screen (16), and a feed line (26) which runs between the container (20) and the dispensing device (24) and is intended for feeding the printing compound (22) from the container (20) to the dispensing device (24).The apparatus (10) according to claim 1, characterized in that the container (20) is arranged outside a printing area (30) of the printing device (14) and / or outside a printing table (32) of the printing device (14) and / or is spaced apart in the horizontal direction relative to the printing screen (16) and / or printing table (32) or is arranged below or above a printing table (32) of the printing device (14) in the vertical direction.The device (10) according to any one of claims 1 or 2, characterized in that during the dispensing of the printing mass (22), the container (20) is and / or remains spaced apart outside a printing region (30) of the printing device (14) and / or outside a printing table (32) of the printing device (14) and / or in the horizontal direction relative to the printing screen (16) and / or printing table (32) or is and / or remains arranged below or above a printing table (32) of the printing device (14) in the vertical direction.Device (10) according to one of the preceding claims, characterized in that the container (20) is and / or remains stationary during the dispensing of the printing mass (22).Device (10) according to one of the preceding claims, characterized in that the container (20) is designed as a bucket (84), in particular with a cylindrically or conically encircling side wall (90) and / or with an opening (92) which is designed on the top side and / or can be closed and / or with a printing mass outlet which is designed on the bottom side.Device (10) according to claim 5, characterised in that the container (20) designed as a bucket (84) has a holding volume of at least 1 dm 3, preferably of at least 3 dm 3, further preferably of at least 4 dm 3, further preferably of at least 5 dm 3, further preferably of at least 7 dm 3, further preferably of at least 9 dm 3, further preferably of at least 10 dm 3, further preferably of at least 15 dm 3, further preferably of at least 20 dm 3, even further preferably of at least 25 dm 3 and even further preferably of at least 35 dm3.Device (10) according to claim 5 or 6, characterised in that the container (20) designed as a bucket (84) has a holding volume of up to 5 dm 3, preferably of up to 7 dm 3, more preferably of up to 9 dm 3, more preferably of up to 10 dm 3, more preferably of up to 15 dm 3, more preferably of up to 20 dm 3, more preferably of up to 25 dm 3, more preferably of up to 30 dm 3, more preferably of up to 35 dm 3, more preferably of up to 45 dm 3, still more preferably up to 50 dm 3 and even more preferably up to 100 dm 3.Device (10) according to one of the preceding claims, characterized in that the container (20) is designed as a cartridge (34), in particular as a disposable cartridge or as a reusable cartridge.Device (10) according to claim 8, characterised in that the cartridge (34) is designed closed and / or has an openable and / or open outlet opening and / or has a piston crown (38) which is displaceable relative to a circumferential cartridge side wall (36)Device (10) according to either of Claims 8 and 9, characterized in that the container (20) designed as a cartridge (34) has a holding volume of at least 50 cm 3, preferably of at least 100 cm 3, more preferably of at least 200 cm 3, more preferably of at least 300 cm 3, more preferably of at least 500 cm 3, more preferably of at least 800 cm 3, more preferably of at least 1000 cm 3, more preferably of at least 1200 cm 3, more preferably of at least 1500 cm 3, even more preferably of at least 1800 cm 3 and even more preferably of at least 2000 cm3.Device (10) according to one of Claims 8 to 10, characterized in that the container (20) designed as a cartridge (34) has a holding volume of up to 200 cm 3, preferably of up to 500 cm 3, more preferably of up to 700 cm 3, more preferably of up to 900 cm 3, more preferably of up to 1000 cm 3, more preferably of up to 1200 cm 3, more preferably of up to 1500 cm 3, more preferably of up to 1700 cm 3, more preferably of up to 2000 cm 3, more preferably of up to 2500 cm 3, still more preferably up to 3000 cm 3 and even more preferably up to 4000 cm 3.Device (10) according to one of the preceding claims, characterized in that the metering device (18) has at least one actuator (40) for conveying the printing mass (22) out of the container (20).Device (10) according to Claim 12, characterized in that the actuator (40) for conveying the printing mass (22) is designed as a suction device (104) for sucking in the printing mass (22) from the container (20), in particular as a worm pump and / or eccentric worm pump.Device (10) according to claim 13, characterised in that the suction device (104) is immersed at least in sections in the container (20) and / or in the printing mass (22) located in the container (20).Device (10) according to either of Claims 13 and 14, characterized in that the suction device (104) is arranged outside the container (20) and / or is in fluid communication with the container (20) via a suction line, and / or in that a suction line which is connected to the suction device (104) is immersed in the container (20) and / or in the pressurized mass (22) located in the container (20).Device (10) according to one of Claims 13 to 15, characterized in that the suction device (104) is designed and / or arranged to convey pressurized mass (22), which is sucked in from the container (20), into the feed line (26) and as far as the output device (24).Device (10) according to Claim 12, characterized in that the actuator (40) for conveying the pressurized mass (22) is designed as a pressure-increasing device (42, 86) for pressurizing the pressurized mass (22) in the container (20) and / or for the pressure-based conveyance of the pressurized mass (22) out of the container (20).Device (10) according to claim 17, characterised in that the pressure increasing device (42) has a linear drive (44), wherein the linear drive (44) is preferably designed as an electrical or electromechanical linear drive (44) and / or as an electrical spindle drive and / or as an electric cylinder and / or as a linear actuator.Device (10) according to one of claims 17 or 18, characterised in that the pressure increasing device (42) is designed as a pneumatic and / or hydraulic linear drive or linear cylinder.Device (10) according to one of Claims 17 to 19, characterized in that the pressure-increasing device (42) is designed and / or configured to subject the piston crown (38) of a cartridge (34) filled with pressurized composition (22) to a compressive force and / or to displace the piston crown (38) of a cartridge (34) relative to the respective cartridge side wall (36) in a longitudinal direction in order to increase the internal pressure of the cartridge (34).Device (10) according to one of the preceding claims, characterized in that the metering device (18) has at least one sensor (46) for determining the position of a piston head (38) of a cartridge (34).Device (10) according to Claim 21, characterized in that the sensor (46) is configured to determine a relative position between a piston crown (38) and the actuator (40) for conveying the pressurized mass (22), in particular a relative position between a piston crown (38) and the linear drive (44).Device (10) according to either of Claims 21 and 22, characterized in that the sensor (46) is configured to determine an absolute position of the piston head (38) of a cartridge (34).Device (10) according to one of Claims 21 to 23, characterized in that the sensor (46) for determining the position of the piston crown (38) is designed as an inductive sensor and / or as a capacitive sensor and / or as a mechanical sensor.Device (10) according to one of Claims 21 to 24, characterized in that the sensor (46) is arranged on the actuator (40) for conveying the printing mass (22), in particular on the linear drive (44).Device (10) according to claim 17, characterised in that the pressure increasing device (86) has a pressure container (88) which can be closed pressure-tightly and in which the container (20) can be positioned for storing the pasty pressurized mass (22).Device (10) according to claim 26, characterised in that the pressure vessel (88) has a connection opening (94) for supplying compressed air and a compressed air line (96) is connected or can be connected to the connection opening (94) in a pressure-tight manner, wherein the connection opening (94) is preferably formed in a cover (98) of the pressure vessel (88).Device (10) according to either of Claims 26 and 27, characterized in that the pressure vessel (88) has an outlet opening (100) for the passage of the feed line (26) or outlet opening (100) for the passage of an outlet line (102) connected to the feed line (26), the outlet opening (100) preferably being formed in a lid (98) of the pressure vessel (88).Device (10) according to claim 28, characterised in that the feed line (26) or an outlet line (102) connected to the feed line (26) is guided through the outlet opening (100) into the interior of the pressure vessel (88), in particular into the vessel (20) positioned in the pressure vessel (88) and filled with pressurized mass (22).Device (10) according to one of the preceding claims, characterized in that the feed line (26) is designed to be flexible and / or elastically deformable and / or flexible and / or free of plastic deformation at least in sections along its length or along its entire length, and / or in that the feed line (26) follows a relative movement between the dispensing device (24) and the container (20) in a flexible manner.Device (10) according to one of the preceding claims, characterized in that the feed line (26) is produced at least in sections or along the entire length from a plastics material, in particular from polyamide and / or polyester.Device (10) according to one of the preceding claims, characterized in that the feed line (26) and / or a section of the feed line (26) can be exchanged without tools.Device (10) according to one of the preceding claims, characterized in that the feed line (26) has a length of at least 10 cm, preferably of at least 15 cm, further preferably of at least 20 cm, further preferably of at least 25 cm, further preferably of at least 30 cm, further preferably of at least 35 cm, further preferably of at least 40 cm, further preferably of at least 50 cm, further preferably of at least 60 cm, further preferably of at least 80 cm, further preferably of at least 100 cm, further preferably of at least 120 cm, further preferably of at least 150 cm, further preferably of at least 170 cm, further preferably of at least 200 cm, further preferably of at least 250 cm, even further preferably of at least 300 cm.Device (10) according to one of the preceding claims, characterized in that the feed line (26) has a length of up to 20 cm, preferably of up to 30 cm, more preferably of up to 40 cm, more preferably of up to 50 cm, more preferably of up to 70 cm, more preferably of up to 100 cm, more preferably of up to 150 cm, more preferably of up to 200 cm, more preferably of up to 250 cm, more preferably of up to 300 cm, more preferably of up to 400 cm, more preferably of up to 500 cm, even more preferably of up to 1000 cm.Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) has a plurality of dispensing openings (62) for dispensing the printing composition (22) onto the printing screen (16), in particular a plurality of dispensing openings (62) formed discretely with respect to one another.Device (10) according to claim 35, characterised in that at least two dispensing openings (62) are dimensioned differently and / or in that at least two dispensing openings (62) have cross-sectional sizes dimensioned differently from one another.Device (10) according to either of Claims 35 and 36, characterized in that at least one of the dispensing openings (62) is of smaller dimensions than a dispensing opening (62) arranged downstream of the pressurized mass (22) in the flow direction (64), and / or in that a dispensing opening (62) arranged downstream of the pressurized mass (22) in the flow direction (64) is of larger dimensions than at least one dispensing opening (62) arranged upstream of the pressurized mass (22) in the flow direction (64) or all of the dispensing openings (62) arranged upstream of the pressurized mass in the flow direction (64).Device (10) according to one of the preceding claims 35 to 37, characterized in that the plurality of dispensing openings (62) is designed and / or arranged to carry out the dispensing of the printing compound (22) onto the printing screen (16) in printing compound sections which are discrete with respect to one another.Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) is designed for dispensing the printing compound (22) onto a closed section (110) of the printing screen (16) and / or onto a pressure overflow section (114) of the printing screen (16).Device (10) according to one of the preceding claims, characterized in that the printing device (14) has a flooding squeegee (50) for flooding the printing screen (16) with printing material (22) and / or at least one printing squeegee (52) for pressing printing material (22) through the printing screen (16) and / or two printing squeegees (52) for pressing printing material (22) through the printing screen (16), wherein the output device (24) is preferably designed for outputting the printing material (22) starting from a position between the flooding squeegee (50) and the printing squeegee (52) and / or between two printing squeegees (52).Device (10) according to claim 40, characterised in that the dispensing device (24) runs at least in sections or completely between the flooding squeegee (50) and the printing squeegee (52) and / or between two printing squeegees (52), in particular in a direction transverse or at an angle to the squeegee direction (54), and / or in that the dispensing device (24) runs at least in sections parallel to a squeegee edge (56) of the flooding squeegee (50) and / or of the at least one printing squeegee (52) and / or in that the dispensing device (24) runs as far as into an intermediate space (60) between the flooding squeegee (50) and the printing squeegee (52) and / or between two printing squeegees (52).Device (10) according to either of Claims 40 and 41, characterized in that a plurality or the plurality of output openings (62) are arranged distributed between the flooding squeegee (50) and the printing squeegee (52) and / or between two printing squeegees (52), in particular are arranged distributed in a direction transverse or at an angle to the squeegee direction (54).Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) has at least one dispensing slot (66) or a plurality of dispensing slots (66), wherein the dispensing slot (66) preferably runs in a direction transverse or at an angle to the doctor direction (54).Device (10) according to claim 43, characterised in that at least one dispensing slot (66) of the dispensing device (24) has a varying width along the longitudinal extension.Device (10) according to claim 43 or 44, characterised in that at least one dispensing slot (66) of the dispensing device (24) has different widths at portions spaced apart from one another in the longitudinal extension of the dispensing slot (66).Device (10) according to one of Claims 43 to 45, characterized in that at least one dispensing slot (66) of the dispensing device (24) is dimensioned to be larger and / or wider in a slot section formed downstream of the pressurized mass (22) in the flow direction (64) than at least one slot section upstream of the pressurized mass (64).Device (10) according to one of Claims 43 to 46, characterized in that at least one dispensing slot (66) of the dispensing device (24) has a size and / or width which increases continuously at least in sections along the flow direction (64) of the printing mass (22).Device (10) according to one of Claims 40 to 47, characterized in that the output device (24) is arranged to travel with the flooding squeegee (50) and / or with the printing squeegee (52) and / or with the printing squeegees (52), in particular is arranged to travel with it in a squeegee direction (54).Device (10) according to one of the preceding claims, characterized in that the metering device (18) is configured for dispensing printing mass (22) via the dispensing device (24) during a squeegee movement in a squeegee direction (54), and / or in that the metering device (18) is configured for continuously and / or periodically repeating dispensing of printing mass (22) via the dispensing device (24) during a squeegee movement in a squeegee direction (54).Device (10) according to one of the preceding claims, characterized in that the metering device (18) is configured for dispensing printing mass (22) during a common and / or moving movement of the dispensing device (24) with a flooding squeegee (50) and / or with at least one printing squeegee (52) in a squeegee direction (54), in particular from a position of the dispensing device (24) moving along and / or moving along in the squeegee direction (54) between a flooding squeegee (50) and a printing squeegee (52) and / or between two printing squeegees (52).Apparatus (10) according to one of the preceding claims, characterized in that the metering device (18) is configured for dispensing printing composition (22) during a stationary position of a printing squeegee (52) and / or of a flooding squeegee (50) and / or when it is stationary in the squeegee direction (54).Device (10) according to one of the preceding claims, characterized in that the metering device (18) has at least one actuator (70) for moving the dispensing device (24), in particular for moving the dispensing device (24) transversely or at an angle to the doctor direction (54).Device (10) according to Claim 52, characterized in that the actuator (70) is designed to move the dispensing device (24) during the dispensing of the printing composition (22) onto the printing screen (16).Device (10) according to either of Claims 52 and 53, characterized in that the actuator (70) is designed to move the dispensing device (24) out of a waiting position into a dispensing position and / or out of a dispensing position into a waiting position.Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) has at least one dispensing tube section (68), in which at least one dispensing opening (62) and / or one dispensing slot (66) is formed.Device (10) according to Claim 55, characterized in that a plurality of discharge openings (62) are provided in the discharge pipe section (68) and / or are arranged distributed along a flow direction (64) of the pressurized mass (22), and / or in that at least one discharge slot (66) is formed in the discharge pipe section (68) so as to extend in the flow direction (64) of the pressurized mass (22).Device (10) according to one of claims 55 or 56, characterised in that the dispensing tube section (68) runs between the flooding squeegee (50) and the printing squeegee (52), in particular transversely or at an angle to the squeegee direction (54) and / or parallel to a squeegee edge (56, 58) of the flooding squeegee (50) and / or of the printing squeegee (52).Device (10) according to one of Claims 55 to 57, characterized in that the dispensing device (24) has a plurality of dispensing tube sections (68), which are preferably aligned with one another and / or which are arranged such that they can be moved uniformly with one another by one actuator (70) or by a plurality of actuators (70).Device (10) according to one of the preceding claims, characterized in that the feed line (26) has at least one distributor (76), preferably a plurality of distributors (76), for distributing a pressurized mass flow to a plurality of parallel-connected feed line sections (78) and / or for feeding a pressurized mass flow to a plurality of output openings (62) and / or a plurality of output slots (66) and / or a plurality of output pipe sections (68).Device (10) according to one of the preceding claims, characterized in that the feed line (26) has at least two feed line sections (78) connected in parallel by a distributor (76), and of the parallel-connected feed line sections (78), at least one feed line section (78) has a further distributor (76) for distributing a pressurized mass flow to a plurality of parallel-connected feed line sub-sections (78).Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) is designed and / or arranged to dispense the printing compound (22) onto the printing screen (16) in at least one longitudinally extended or line-shaped printing compound section (122).Device (10) according to one of the preceding claims, characterized in that the metering device (18) has at least one shut-off valve (138) for shutting off a pressurized mass flow, wherein the shut-off valve (138) is preferably designed as part of the feed line (26) and / or for shutting off the feed line (26).Device (10) according to claim 62, characterised in that along the run of the feed line (26), the distance of the shut-off fitting (138) from the container (20) with pressurized mass (22) is greater than the distance of the shut-off fitting (138) from the dispensing device (24) and / or from at least one dispensing opening (62) and / or one dispensing slot (66).Device (10) according to one of the preceding claims, characterized in that the metering device (18) has a container changing device (124) for the automated changing of the container (20) dispensing the respective printing composition (22), in particular of the container (20) designed as a cartridge (34) or of the container (20) designed as a bucket (84).Device (10) according to Claim 64, characterized in that the container changing device (124) is designed for the tool-free and / or automated or semi-automated changing of the container (20) dispensing the respective printing compound (22).Device (10) according to one of Claims 64 or 65, characterized in that the container changing device has a rotary indexing table for a container (20) designed as a bucket (84).Device (10) according to one of Claims 64 to 66, characterized in that the container changing device (124) has a connection plate (128) with a passage (130) for the passage of pressurized mass (22) from a container (20), wherein the passage (130) is designed for the connection of the feed line (26) and / or wherein, depending on a relative position between the connection plate (128) and a plurality of containers (20), a fluid connection can be produced between the feed line (26) and one of the plurality of containers (20) and / or in that, by adjusting the relative position between the connection plate (128) and at least one container (20), a fluid connection can be produced between the feed line (26) and a further container (20).Apparatus (10) according to one of the preceding claims 64 to 67, characterized in that the container changing apparatus (124) is arranged outside a printing region (30) of the printing device (14) and / or is arranged at a distance in the horizontal direction relative to the printing screen (16) or is arranged below a printing table (32) of the printing device (14) in the vertical direction.Device (10) according to one of the preceding claims, characterized in that the metering device (18) and / or the actuator (40) is designed for conveying the printing mass (22) out of the container (20) for volumetric metering of the printing mass (22).Device (10) according to one of the preceding claims, characterized in that the metering device (18) and / or the actuator (40) is designed for conveying the pressurized mass (22) for stroke-based and volumetric metering of the pressurized mass (22), and / or in that the actuator (40) is designed for conveying the pressurized mass (22) for volumetric metering by stroke control.Device (10) according to one of the preceding claims, characterized in that the metering device (18) has a receiving cavity (134) for receiving a cartridge (34), wherein the receiving cavity (134) is preferably designed for the support, at least in sections, of a cartridge side wall (36).Device (10) according to one of Claims 52 to 711, characterized in that the actuator (70) for moving the dispensing device (24) is designed as a portal axis system (72) or as part of a portal axis system (72).Device (10) according to one of the preceding claims, characterized in that the metering device (18) has a run-on stop device (140) for preventing and / or reducing run-on of printing mass (22) from the dispensing device (24).Device (10) according to Claim 73 characterized in that the after-run stop device (140) is formed by the shut-off fitting (150).Device (10) according to either of Claims 73 and 74, characterized in that the run-on stop device (140) is designed to relieve pressure from a piston head (38) of a cartridge (34) and / or to reverse the movement of a piston head (38) of a cartridge (34) and / or to reverse the movement of the actuator (40) for conveying the pressurized mass (22).Device (10) according to one of Claims 73 to 75, characterized in that the run-on stop device (140) is designed to cancel, in particular temporarily cancel, the active engagement and / or contact between the actuator (40) for conveying the printing mass (22), in particular the linear drive (44), and the piston crown (38) of a cartridge (34).Device (10) according to one of Claims 73 to 76, characterized in that the run-on stop device (140) has a pressure-based control system and / or is designed by a pressure-based control system for avoiding and / or reducing run-on of printing mass (22) from the output device (24).Device (10) according to Claim 77, characterized in that the pressure-based control is set up for detecting and / or processing a delivery pressure of the printing mass (22) and / or a pressure generated by an actuator (40) for delivering the printing mass (22) and / or acting on a piston crown (38) of a cartridge (34).Device (10) according to one of the preceding claims, characterized in that the dispensing device (24) has a stripping device for stripping printing compound (22) from a dispensing opening (62) or from a dispensing slot (66).Device (10) according to one of the preceding claims, characterized in that the feed line (26) has a return stop device (146) for preventing and / or reducing the return of pressurized mass (22) counter to an output flow direction (148), wherein the return stop device (140) is preferably designed as a shut-off fitting (150).Device (10) according to Claim 80, characterized in that, along the course of the feed line (26), the distance of the return stop device (146) from the container (20) with pressurized mass (22) is less than the distance of the return stop device (140) from the dispensing device (24).Device (10) for producing three-dimensional screen-printed workpieces, in particular 3D screen-printing plant, having a printing device (14) which has a printing screen (16) for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes and having a metering device (18) for the metered dispensing of a pasty printing compound (22) onto the printing screen (16), wherein the metering device (18) has at least one container (20) for storing the pasty printing compound (22) and / or a dispensing device (24) for dispensing the printing compound (22) onto the printing screen (16) and at least one actuator (40) for moving the container (20) and / or the dispensing device (24), wherein the actuator (40) is designed as a portal axis system (72) or as part of a portal axis system (72).Device (10) for producing three-dimensional screen-printed workpieces, in particular 3D screen-printing plant, having a printing device (14) which has a printing screen (16) for the layer-by-layer production of at least one screen-printed workpiece in a plurality of printing processes, and having a metering device (18) for the metered dispensing of a pasty printing compound (22) onto the printing screen (16), wherein the metering device (18) has a run-on stop device (140) for preventing and / or reducing the run-on of printing compound (22) from the metering device (18).

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