STORAGE SYSTEM AND PRESSURE SYSTEM

Description

[0001] The invention relates to a storage system for storing and providing printing material for a printing device, in particular for printing flat substrates, with at least one container designed to store a liquid printing material and with at least one carrier on which the container can be detachably arranged.

[0002] Furthermore, the invention relates to a printing system for printing flat substrates, in particular circuit boards, solar cells or wafers, with at least one print head, in particular dispenser, for applying printing compound to the substrates, wherein the print head is or can be connected to a container providing printing compound, and with a storage system which has at least one container which is designed to store a liquid printing compound and at least one carrier on which the container can be detachably arranged.

[0003] Storage facilities and printing systems of the type mentioned above are already known from the prior art. The printing of flat substrates with different printing materials, such as ink or electrically conductive paste, is already known from applications such as printed circuit board technology and solar technology. Because not always the same printing material is used in existing printing devices, it is necessary to keep the different printing materials ready in suitable containers and, when needed, connect the respective container to the print head or printing device so that the printing material can be removed from the container and applied to the substrate. One possibility is to permanently connect the print head to several containers in order to be able to access different printing materials quickly. However, this requires a space-intensive print head with complex cable and line routing.Solutions with replaceable containers are therefore preferred. To ensure the container can be safely stored outside the printing device or print head, storage devices are known that have a carrier that fits the container, allowing the container to be securely attached to the carrier and removed from or from the carrier as needed.

[0004] Published patent application GB 2 325 437 A discloses a printing press with an ink system comprising a magazine, which can be configured as a revolving magazine. Published patent application WO 2020 / 035135 A1 discloses a printing device for printing individual sheets, which has a gripper system transported by a conveyor belt to transport the sheets. Published patent application US 2012 / 097055 A1 also discloses a machine for labeling containers, which has a rotary magazine.

[0005] The invention is based on the object of creating an improved storage device which, on the one hand, enables the storage of different printing masses and, on the other hand, ensures easy removal of the printing masses.

[0006] The object underlying the invention is achieved by a storage device having the features of claim 1. This is characterized in that it is designed as a storage magazine having a plurality of carriers, wherein the carriers are fastened to a circulating conveyor belt, wherein the conveyor belt is assigned at least one controllable drive motor for driving the conveyor belt. The storage magazine is in particular a ring magazine in which the carriers are fastened to the conveyor belt and can be moved with the conveyor belt along a closed ring shape. As a result, the carriers and any containers located on the respective carrier can be transported along the path of movement of the conveyor belt and thus preferably displaced from a protected stowage position to a removal position. Due to the design as a storage magazine, a large number of containers can be stored on the conveyor belt and selected as needed.The drive motor, which is preferably designed as an electric motor, pneumatic motor, or hydraulic motor, ensures targeted movement of the containers or carriers with minimal space requirements. The conveyor belt is preferably designed as a conveyor cable or a conveyor belt, particularly preferably as a toothed belt.

[0007] According to the invention, the conveyor belt with the carriers is arranged in a housing, and the housing has at least one opening through which the respective container can be attached to or removed from one of the carriers. The opening is thus formed at a transfer point in the housing, at which containers can be removed from or inserted into the magazine. Otherwise, the housing is closed according to the invention, so that the containers within the housing are protected from external influences. The housing also ensures, for example, that the interior of the housing can be temperature-controlled or provided with a climate that ensures long storage life of the printing materials in the housing or in the storage magazine. For this purpose, a controllable air conditioning device is preferably assigned to the housing.According to the invention, a closing element is assigned to the opening of the housing, by means of which the opening can be completely closed in order to maintain the climate within the housing in an energy-efficient manner. The closing element is in particular assigned an actuator by means of which the closing element can be opened or closed automatically. Instead of a displaceable, in particular pivotable or sliding closing element, a curtain, in particular a slatted curtain, is also conceivable in the region of the opening in order to close it at least as largely as possible and thereby protect the interior from the climate in the vicinity of the housing. The opening is preferably formed in the side wall and / or top wall of the housing.

[0008] According to a preferred embodiment of the invention, the supports of the storage magazine are all of the same design. Thus, they all serve to accommodate containers of the same design. This makes the system easy to use, and different pressure compounds can be filled into the containers. This ensures easy replacement and optimized use of the installation space.

[0009] In particular, the conveyor belt is designed to rotate in a horizontal plane, so that when the conveyor belt is driven, the containers are also displaced or shifted in the horizontal plane. This ensures that the containers are always located next to one another in the storage magazine, and collision between adjacent containers is reliably prevented. According to an alternative embodiment, the conveyor belt runs in a plane inclined to the horizontal plane, wherein the supports can then be rotated relative to the conveyor belt in order to maintain the alignment of the containers regardless of their position along the conveyor belt, thus ensuring that no printing compound can escape from one of the containers. Preferably, each container has a closing element or a lid that closes a filling and / or removal opening for the printing compound.Optionally, each container in the system has an actuatable valve that allows the container to be automatically connected to a print head.

[0010] Furthermore, it is preferably provided that each carrier has a V- or U-shaped receptacle open at the edge. This allows the containers to be inserted into the respective carrier from the side or edge and, for example, does not have to be inserted completely from above. This ensures easy loading and unloading of containers from the carriers of the storage magazine.

[0011] The storage device preferably has a plurality of containers which are also of identical design so that each container interacts securely with each carrier. Each container preferably has a guide section which can be inserted into the receptacle and a holding section, wherein the holding section has at least one holding projection which projects laterally beyond the guide section and is intended to rest on the carrier. The container can thus be pushed with the guide section edgewise into the receptacle of the respective carrier laterally or radially with respect to a central axis of the container in order to then set the container down or put down on the carrier with the holding section. For this purpose, the holding projection has a width which is greater than the clear width of the receptacle of the carrier so that the container can be securely arranged on the carrier.

[0012] Particularly preferably, the retaining projection is designed as a collar extending over the circumference of the container. This ensures that, regardless of the container's rotational position about its longitudinal center axis, the container can always be securely attached to the support, since the collar can be placed on the support at the edge of the receptacle, regardless of the rotational position.

[0013] Particularly preferably, the container has a circular cross-section, so that it is designed in the shape of a circular cylinder or a test tube and can be securely mounted on the carrier at any time. In particular, the containers are designed as printer cartridges that can be used in a print head or a printing device.

[0014] Furthermore, it is preferably provided that at least one sensor for detecting at least one state value of a printing compound in one of the containers is arranged in the housing. For example, the sensor serves to determine the fill level of the printing compound in a container arranged on a carrier. Furthermore, it is preferably provided that at least one sensor is designed to determine a quality of the printing compound, for example, with regard to an ink particle density or a moisture content or an aging state.

[0015] For this purpose, the sensor is designed, in particular, as a light sensor, weight sensor, or fill level sensor. The sensor is arranged and fixedly positioned within the housing, allowing the containers containing the pressure masses to be conveyed past the sensor by the conveyor belt, ensuring that a sensor operation is always performed at the same location within the housing.

[0016] Particularly preferably, each container has an identification device, and the storage magazine has at least one reader for detecting an identification of the respective container provided by the identification device. The identification device is designed, for example, as an optically detectable identification feature, such as a barcode, DMC code (Data Matrix code), or QR code (Quick Response Code). Preferably, the identification device is designed as an RFID chip (RFID = Radio Frequency Identification), so that contact-free detection of the identification of the respective container is possible without the use of optical means. The use of an RFID chip also makes it possible for the storage device itself to store data in the identification device of the respective container, such as data relating to the current fill level or the quality of the printing material contained in the container.The storage time, storage status, and storage history can also be stored. Using the identification device and the reader, it is thus possible to always remove a specific container from the storage magazine or transport a specific container to the removal point via the conveyor belt. Optionally, or alternatively, the carriers can each have an identification device to store the assignment of the containers to the carriers.

[0017] According to a preferred development of the invention, at least one hold-down device for the containers, which hold-down device has a ramp, is arranged in the housing above the conveyor belt. The hold-down device ensures, for example, that incorrectly inserted containers in the carriers are moved by the hold-down device into a lowered position or placed on the carrier as they are conveyed along the hold-down device by the conveyor belt. This ensures that the containers are always held securely and in a desired position on the respective carrier. Optionally, a closing element is assigned to the containers as the container moves past and pushed into an opening in the container in order to automatically close the top of the container, or an existing closing or lid element is pressed back into the container.The containers preferably have an opening at one end through which the containers can be filled with the desired printing compound in a separate device. The opening is preferably tightly closed by a closing element. After the respective container has been inserted into the storage magazine, the hold-down devices ensure that the closing element, should it become detached or partially detached from the container, is forced back into the closed position. This is advantageous, for example, if the closing element is forced out of the container due to pressure generated in the container during its use in a printing device.

[0018] According to a preferred development of the invention, the storage magazine is also assigned a transport device, in particular a dispenser of a printing device, which is designed to remove a container from a support of the storage magazine and feed it to the printing device, and to remove a container from a printing device and arrange it on a support of the storage magazine. The transport device thus automates the removal of containers from the storage magazine and the feeding of containers into the storage magazine. The transport device is, for example, a controllable robot arm or the dispenser of the printing device itself.

[0019] The printing system according to the invention with the features of claim 14 is characterized by the inventive design of the storage device. This results in the aforementioned advantages. In particular, the printing system also features the aforementioned transport device, by means of which a container can be transported from the storage magazine to the print head or from the print head to the storage magazine. This ensures a fully automatic printing mass exchange at the print head, whereby the storage magazine can provide a selection of different printing masses in a small space thanks to the multiple containers.

[0020] Particularly preferably, the dispenser forms a transport device by means of which a container can be removed from the storage system or fed to the storage system. As a result, the transport of the container from the storage system to the printing device can be accomplished by the dispenser itself. Particularly preferably, the dispenser has at least one gripping device by means of which the dispenser, which is movable independently of the print head of the printing device, can grip and remove a container from the storage magazine. In particular, the gripping device also automatically establishes a fluidic connection between the dispenser and the container and the printing compound contained therein when the container is removed from the storage system, and interrupts it when the container is fed to the storage system by the dispenser.

[0021] Further advantages and preferred features and combinations of features will become apparent from the foregoing description. The invention will be explained in more detail below with reference to the drawings. Figure 1 shows an advantageous bearing device for a printing system in a perspective view, Figure 2 shows an enlarged detailed view of the bearing device from Figure 1 , Figure 3 shows a further perspective view of the bearing device without the housing, Figures 4A and 4B show further detailed views of the bearing device, Figure 5 shows an advantageous further development of the bearing device in a perspective view and Figure 6 shows an advantageous printing system with the bearing device in a simplified view.

[0022] Figure 1shows a perspective view of an advantageous storage device 1 for a printing system not shown in detail here. The storage device 1 has a housing 2 in which a storage magazine 3 is arranged, which is designed as a ring magazine. For this purpose, the storage magazine 3 has a conveyor belt 4 which is arranged so as to rotate in a horizontal plane in the housing 2 and has a plurality of supports 5, each for receiving a container 6. An opening 7 is formed in the housing 2, through which the storage magazine 3 can be reached, in particular in order to remove containers 6, preferably automatically, or to feed containers 6 to the storage magazine 3. For the removal and feeding, a transport device is provided, which is explained in more detail below.The opening 7 is only slightly wider than one of the supports 5 and larger than one of the containers 6, so that a container 6 can be removed or taken out or added through the opening 7. The opening 7 extends in a side wall 8 and, according to the present embodiment, also in a ceiling wall 9, so that when a support 5 is located in the region of the opening 7, the container 6 arranged on the support 5 can be reached both from above through the opening 7 in the ceiling wall 9 and through the side wall 8. Optionally, the housing 2 has, in particular on an end face 2', which is located in particular at the end of the housing 2 facing away from the opening 7, a further, in particular wide opening, which is designed for manual or fully autonomous loading of the containers 6, thus enabling manual or fully autonomous loading of the containers in the storage magazine 3.

[0023] Figure 2shows an enlarged perspective view of the storage device 1 in the area of ​​the opening 7. The supports 5 are all designed the same, so that Figure 2shown carrier, the structure of which will be described in detail. Each carrier 5 has a carrier element 10 which is firmly connected to the conveyor belt 4 and which is fork-shaped, so that it has a V- or U-shaped receptacle 11. The receptacle 11 is open at the edge, specifically on the outer side 12 of the carrier element 10 facing away from the conveyor belt 4. Starting from the outer side 12, the clear width of the receptacle 11 tapers, so that preferably no undercuts exist in the receptacle in the lateral insertion direction. On an upper side 13 of the carrier element 10, in the region of the receptacle 11, a recess 14 is formed, which extends up to the receptacle 11. The recess 14 completely surrounds the receptacle 11 and has an outer contour which essentially corresponds to the contour of the recess 14. This creates a support 15 in the carrier element 10, in which the respective container 6 is held in a form-fitting manner, as in Figure 1shown.

[0024] The containers 6 are each designed as a cartridge and have a cylindrical base body 16, which is open at one end 17 and closed at the end 18 facing away from the one end 17. At the end 17, the container 6 also has a laterally projecting retaining projection 18 in the form of a collar 19 extending over the entire circumference of the container 6. According to the present embodiment, the cross-section of the container 6 is circular, so that the collar 19 also has a circular cross-section or a circular outer contour. The recess 14 in the carrier 10 has a corresponding outer contour, which has a slightly larger diameter than the collar 19.As a result, the respective container 6 can be inserted with the collar 19 into the receptacle 11 from the side or from above and can be placed with the collar 19 on the support 15 in the recess 14, so that the container is securely held in the carrier 5. In particular, the container 6 can be gripped by the aforementioned transport device from above through the opening 7 in the region of the ceiling wall 9 and / or from below or laterally through the opening in the region of the side wall 8, slightly lifted and then guided laterally out of the housing 2 through the opening 7 in the side wall 8, or vice versa, as indicated by the double arrows in . Figure 1 indicated.

[0025] The conveyor belt 4 is arranged in the upper area of ​​the housing 2, so that even larger containers 6, as in Figure 1shown, can be accommodated by the supports 5 without hitting the bottom of the housing 2. In principle, different containers 6, in particular containers of different lengths or heights, can be placed in the supports. However, the containers 6 of the storage device 1 or the printing system are preferably of identical design.

[0026] Figure 3shows the storage device 1 in a further perspective view without the housing 2. A support structure 20 is arranged on the housing base, which supports a guide plate 21 at a distance from the housing base. The guide plate 21 extends horizontally when installed as intended and has a narrow width and a comparatively large length, so that it is designed to be horizontally elongated. At both ends - viewed in the longitudinal extent - of the guide plate 21, deflection rollers 22, 23 are arranged, around which the conveyor belt 4 is guided parallel to the guide plate 21 and is in particular tensioned. The axes of rotation of the deflection rollers 22, 23 are aligned vertically. The conveyor belt 4 is designed in particular as a toothed belt, and at least the deflection roller 22 has external teeth corresponding to the teeth of the toothed belt in order to ensure reliable torque transmission to the toothed belt.

[0027] The deflection roller 22 is connected in a rotationally fixed manner to a drive motor 24 by a shaft extending through the guide plate 21. The drive motor 24 is arranged below the guide plate 21 and thus between the housing base and the guide plate 21. In particular, the drive motor 24 is designed as an electric motor. By electrically controlling the drive motor 24, the conveyor belt 4 can be set in motion so that it rotates in a ring around the deflection rollers 22, 23.

[0028] Preferably, a guide element 45 is located between the deflection rollers 22, 23, ensuring that the toothed belt follows a designated track in the area between the deflection rollers 23. The element 25 serves, in particular, as a spacer between the counter-rotating conveyor belt sections of the conveyor belt 4 during operation.

[0029] As in Figure 3As shown, several, in this case ten, supports 5 are arranged on the conveyor belt 4. Since the conveyor belt 4 extends in a horizontal plane in a ring shape, the supports 5 are all arranged on the outside of the conveyor belt 4 and, in particular, evenly spaced from one another—as seen in the direction of extension of the conveyor belt 4. While ten supports 5 are present according to the present embodiment, the storage device 1 can of course also have more or fewer supports 5.

[0030] Figure 3shows the storage device 1 on the side of the housing 2 facing away from the opening 7. In particular, on the end of the conveyor belt 4 facing away from the drive motor 24, a plurality of sensor devices 25 to 27‴ are optionally arranged, which serve, for example, to determine a fill level of printing compound in the respective container 6 or a quality of the printing compound. According to the present exemplary embodiment, the sensor 25 is designed for container or cartridge detection, in particular for detecting the presence of a cartridge and / or its fill level. The sensor 26 is designed in particular as a barcode reader, which serves to read a barcode applied to the respective cartridge or container 6. The sensor 27' is preferably designed as a reading and / or writing device for RFID chips or tags.The sensor 27' is assigned to the upper side of the carriers 10 in order to read or write RFID chips arranged on the carriers 10. A further sensor device 27" is provided alternatively or additionally and is also designed as a reading and / or writing device for RFID chips, which in this case are then arranged or can be arranged on the respective container 6. A further sensor 27" is optionally arranged on the front side 2', in particular in the area of ​​the bottom, which serves as a safety switch in the area of ​​the opening of the housing 2 formed in the front side 2'. For this purpose, the sensor 27" is designed in particular to generate a light grid that extends over the openings of the front side 2' and ensures safe intervention by the operator for loading or removing containers 6, and thus for feeding the storage magazine 3.If the sensor 27‴ detects, for example, that a user reaches into the housing 2 through the opening in the front side 2', the conveyance of the containers 6 by the conveyor belt 4 is interrupted. The sensor 27‴ thus acts as a safety circuit for the storage magazine 3.

[0031] Furthermore, Figure 3 that several hold-down devices 28, 29 are arranged in the housing 2. In the normal running direction of the conveyor belt, as indicated by arrows in Figure 3 As shown, the hold-down devices 28 have bevels 30 which, in the direction of movement of the containers, have a decreasing distance from the containers 6. The hold-down devices 28 serve, for example, to press a closing element for the respective container 6 into the respective container 6 or to slide the respective container 6 onto the receptacle 15 until it stops with the collar 19 in order to ensure a secure hold on the respective holder 5.

[0032] Figures 4A and 4Bshow in enlarged detail views the guidance of the beams 5 in the storage device 1. Figure 4A a plan view of one of the supports 5, which is located at one end of the conveyor belt 4, and Figure 4B a perspective view of the same support 5.

[0033] The guide plate 21 has a guide groove 31 extending over its entire circumference. Each support 5 has, on its underside associated with the guide plate 21, two guide rollers 32 or bolts located in the guide groove 31. The guide rollers 32 have an outer diameter that is slightly smaller than the inside width of the guide groove 31, so that the support 5 or the support element 10 is guided along the guide groove 31 on the guide plate 21 by means of the guide rollers 32.

[0034] Especially in the top view of Figure 4AIt can be seen that the conveyor belt has a laterally projecting driver 33, which lies in a lateral recess 34 of the carrier element 10. In particular, the driver 33 is pressed into the recess 34, so that it is connected to the carrier 5 without any play. On the side facing away from the carrier 5, the driver 33 is firmly connected to the conveyor belt 4, particularly preferably formed integrally with it. If the conveyor belt 4 is now driven, the driver 33 pushes the carrier 5 with the guide rollers 32 along the guide groove 31 of the guide plate 21.

[0035] Each support 5 has two additional guide rollers 32 on the upper side 13 facing away from the guide plate 21, which are arranged axially parallel to the guide rollers 32 on the underside of the support 5. These guide rollers 32 serve to run in a guide groove corresponding to the guide groove 31 of a further guide plate 35, which is arranged opposite the guide plate 21 and thus covers the belt drive from above.

[0036] Figure 5 shows, in a further perspective view, the storage device with the guide plate 35 now drawn in, which is opposite the guide plate 21, so that the supports 5 run between the guide plates 21, 35 and each rests with its guide rollers 32 in one of the guide grooves 31. This ensures safe and precise guidance of the supports with the conveyor belt 4.

[0037] By controlling the drive motor 24, the containers 6 can be moved such that they are fed to the opening 7 as needed so that they can be removed from there. Advantageously, the containers and / or the carriers each have an identification device 36, which is designed, for example, as an optically readable QR code or barcode, or as an RFID chip, as already described above. By means of an appropriate sensor system, in particular by means of the sensor 27, which in this case is designed as a reader for the identification device 36, the data can be recorded and thus the respective container and / or carrier can be identified and stored, for example, in a memory of a control unit of the storage facility. If necessary, the stored and selected container can then be specifically fed to the opening. Because the RFID chips each represent a non-volatile memory, interference immunity is guaranteed.This is important for warehousing when the storage facility 1 or the associated printing device is switched off at night, on weekends and / or for longer periods and the containers 6 remain in the storage facility 1 or in the printing device.

[0038] Figure 6shows, in a schematic representation, the integration of the storage device 1 into an advantageous printing system. The printing system has a printing device 37 with a print head 38 and with a controllable dispenser 39. The dispenser 39 can be controlled and moved independently of the print head 38. The dispenser 39 has a cartridge holder 40 into which one of the containers 6 with a desired printing compound can be inserted. Furthermore, the printing device 37 has a printing table 41 on which a substrate 42 to be printed can be placed for the printing process. The substrate 42 is, for example, a circuit board, a wafer or a solar cell or the like.The printing mass from the container 6 is applied by the dispenser 39 to a printing stencil, which is only indicated here, and is then applied by the print head 38, in particular by means of a squeegee of the print head 38, through the printing stencil onto the substrate 42 to be printed.

[0039] The storage device 1 is arranged next to the print table or the print head. A transport device 43 is assigned to the storage device 1, which, according to one exemplary embodiment, has a controllable robot arm. The robot arm is designed to remove a container 6 from the opening 7 of the housing 2 of the storage device 1 and insert it into the cartridge receptacle 40 of the dispenser 39, or to feed it from the dispenser 39 to the storage magazine 3.

[0040] According to the present embodiment, the transport device 43 is formed by the dispenser 39. For this purpose, the dispenser 39 has, for example, a gripping device 44, which is designed to remove a container 6 from the storage magazine 3 or to supply it thereto.

[0041] In particular, the cartridge receptacle 40 and the containers 6 are designed such that, upon insertion into the cartridge receptacle 40, a connection to the printing compound in the container 6 is automatically opened or released. For this purpose, the containers 6 have, for example, a valve 45 at their end 18 facing away from the collar 19, which cooperates with a corresponding actuating device in the cartridge receptacle 40 to release the printing compound.

[0042] The storage device 1, together with the transport device 43 and the printing table 37, forms the printing system, which allows for fully automated printing mass changes and thus achieves high throughput times when producing certain products that require printing with different printing masses. The printing masses can be, for example, electrically conductive printing masses for creating circuit paths, but also inks or other masses or pastes.

[0043] Through the openings in the front side 2' of the storage magazine 3, the storage magazine 3 can be loaded and unloaded (supplied) manually by an operator or automatically by a machine or robot (neither shown). Opening 7 is thus reserved for access by the dispenser 39 or the transport device 43. This ensures decoupling of the printing device 37 from the loading of the storage magazine 3.

Claims

1. A storage system (1) for storing and providing printing compound for a printing device (37), in particular for printing on planar substrates, comprising at least one container (6), which is formed for storing a liquid printing compound, and comprising at least one carrier (5), on which the container (6) can be detachably arranged, wherein it has a storage magazine comprising several carriers (5) and comprising several containers (6), wherein the carriers (5) are fastened to a circulating conveyor belt (4), wherein at least one controllable drive motor (24) for driving the conveyor belt (4) is assigned to the conveyor belt (4), characterized in that the conveyor belt (4) comprising the carriers (45) is arranged in a housing (2), and that the housing (2) has at least one opening (7) at a transfer point, through which the container (6) can be fastened to one of the carriers (5) or can be removed from one of the carriers (5), that a closing element is assigned to the opening (7), by means of which the opening (7) can be closed completely, and that, apart from that, the housing (2) is formed to be closed.

2. The storage system according to claim 1, characterized in that all of the carriers (5) are formed identically.

3. The storage system according to any one of the preceding claims, characterized in that the conveyor belt (4) is formed so as to circulate in a horizontal plane.

4. The storage system according to any one of the preceding claims, characterized in that each carrier (5) has a V- or U-shaped receptacle (11), which is open on the edge side.

5. The storage system according to any one of the preceding claims, characterized in that the respective container (6) has a guide section, which can be inserted into the receptacle (11), and a holding section, wherein the holding section has at least one holding protrusion, which protrudes laterally beyond the guide section, for placement on the carrier (5).

6. The storage system according to any one of the preceding claims, characterized in that the holding protrusion (18) is formed as collar (19) extending completely over the circumference of the container (6).

7. The storage system according to any one of the preceding claims, characterized in that the container (6) has a circular cross-section.

8. The storage system according to any one of the preceding claims, characterized in that all of the containers (6) are formed identically.

9. The storage system according to any one of the preceding claims, characterized in that in the housing (2) has at least one sensor (27) for detecting at least one state value of a printing compound in one of the containers (6).

10. The storage system according to any one of the preceding claims, characterized in that the sensor (27) is formed as light sensor, fill level sensor, or matrix scanner.

11. The storage system according to any one of the preceding claims, characterized in that each container (6) has an identification means (36), and that at least one reader for detecting an identification feature provided by the identification means (36) is assigned to the conveyor belt (4).

12. The storage system according to any one of the preceding claims, characterized in that at least one holding-down device (28) having a run-on slope is arranged above the conveyor belt (4) and is assigned to the carriers.

13. The storage system according to any one of the preceding claims, characterized in that a transport means (43), in particular a dispenser (39) of a printing device (37), which is formed to extract a container (6) from a carrier (5) of the storage magazine and to deliver it to a printing device (37), and to extract a container (6) from a printing device (37) and to arrange it on a carrier (5) of the storage magazine (3), is assigned to the storage magazine.

14. A printing system for printing on planar substrates (42), in particular circuit boards, solar cells, or wafers, comprising at least one print head (38), in particular dispenser, for applying printing compound to the substrates (42), wherein the dispenser (39) can be connected or is connected to a container (6) providing a printing compound, and comprising a storage system (1), which has at least one container (6), which is formed for storing a liquid printing compound, and at least one carrier (5), on which the container (6) can be detachably arranged, characterized in that the storage system (1) is formed according to any one of claims 1 to 13.

15. The printing system according to claim 14, characterized in that the dispenser (39) forms a transport means (43), by means of which a container (6) can be extracted from the storage system (1) or can be delivered to the storage system (1).