TW201832944A - Printing device - Google Patents

Abstract

The invention relates to a printing apparatus (1), in particular for printing flat substrates (5), in particular solar cells, wafers, printed circuit boards or the like, having a printing device (2), which is associated with at least one movable printing table (6), having a feed device (7) for feeding substrates (5) to the printing table (6), and having a removal device (8) for removing substrates (5) from the printing table (6). According to the invention, a movement device (9) can forcibly move the printing table (6) along a curved path (10) such that the printing table shifts a substrate (5) from the feed device (7) to the printing device and from the printing device (2) to the removal device (8).

Description

Printing Equipment

The invention relates to a printing device, in particular for printing flat substrates, in particular wafers, solar cells, printed circuit boards, etc., having a printing device assigned at least one movable printing station for A substrate is supplied to the supply device of the printing table, and a deriving device for deriving the substrate from the printing table.

Printing devices of the type described in the opening paragraph are known from the prior art. In order to process flat/planar substrates (such as solar cells, wafers, circuit boards, etc.), there is a need for a printing apparatus that is capable of moving substrates with sufficient accuracy and precision for processing. Flat substrates from electronic technology are typically printed with a conductive paste to, for example, fabricate electrical rails and/or conductive contacts. For this purpose, printing devices are known which apply a predetermined pattern of electrical conductors to the substrate, for example by means of a doctor blade driven by a printing screen or printing mask. Typically, such printing devices cooperate with supply and derivation devices that supply substrates to a printing station and again eject the substrate from the printing station after the printing process. In this case, the supply device, the printing device and the derivation device are usually arranged one behind the other, in particular in one line or integrated into one line. The supply and export of the substrate means additional time, and only the substrate can be processed sequentially. Furthermore, different drives are required for separate purposes, which require structural space and precise control.

The object of the invention is therefore to create an improved printing device which allows a simple and rapid transport of the substrate to the printing device and away from the printing device, wherein as few parts as possible and, in particular, The number of drive machines required for this. The object on which the invention is based is achieved by a printing apparatus having the features of claim 1 of the scope of the patent application. The printing apparatus has the advantage that the printing station itself takes on the main task in receiving and outputting the substrate, thereby simplifying the general operation of the printing apparatus and, in particular, allowing continuous operation in an energy-efficient and high-productivity manner. get on. According to the invention, it is proposed that the printing station can be forcibly guided by the mobile device along a curved path so that the printing station sends the substrate from the supply device to the printing device and from the printing device to the delivery device. Device. The printing station is caused to perform a predetermined movement by movement of the printing table along a curved trajectory, at least from the supply device, the printing device, to the derivation device. Thus, the printing station takes the substrate to be printed on the supply device and directs it to the printing device during its movement, at which the printing process can be carried out in order to subsequently move to the exporting device. For this purpose, most of the mobile work for the substrate falls onto the printing table, with a small portion falling onto the supply and the delivery device. Thereby, the movement process is simplified overall, but the rapid positioning of the substrate in the printing device is also ensured. The curved trajectory here defines the path followed by the printing station. Since the printing table is not (only) linearly moved, movement in a plurality of directions is achieved, whereby the printing station can advantageously be supplied to the deriving device, the printing device and the deriving device. In particular, the printing table can thus be moved from below to the supply device and moved from above to the derivation device, whereby a particularly simple substrate reception and substrate output can be achieved. According to a preferred refinement of the invention, the curved path is designed as a closed curved path so that the printing table continues to move from the extension device along the curved path or can continue to be moved to the supply device. Thus, by the closed design of the curved track, the printing table undergoes a circular movement, which has the advantage that a simple drive is required to move the printing table, in particular in only one direction. Since the printing table can perform continuous movement, the downtime of the printing apparatus can be minimized and the throughput of the substrate to be printed is increased. Furthermore, it is achieved that the printing apparatus can have a plurality of such printing stations for printing devices that can move along the same curved trajectory because of the movement along the closed curved trajectory. By means of the closed curved trajectory, the respective printing station is moved back to the supply device in a simple manner in order to receive a new substrate and supply it to the printing device. The movement is thereby cyclic and continuously rotated, thereby facilitating the acceleration behavior and wear behavior of the device. It is also preferred to propose that the curved trajectory lies in a vertical plane. This means that the respective printing station moves in a vertical plane, so that the movement takes place in a space-saving manner. Furthermore, the advantage of the curved trajectory in the vertical plane is that the printing station also moves up and down along the curved trajectory, which simplifies the reception and output of the substrate on the supply or the ejecting device, for example because the printing station, for example The substrate is taken out from the supply device from below during its movement and placed on the export device from above. In particular, it is proposed that the curved path is a circular trajectory such that the printing table follows a circular trajectory and performs a circular movement. In particular, it is achieved that the printing station can be guided and supported mechanically in a particularly simple manner. Although a bending tool (which is not circularly oriented and which also shows one possible embodiment of the invention) also requires a traction tool drive (especially a chain drive, a belt drive, a linear motor, etc.) or assigned to The printing unit's own drive unit, but movement along a circular path, allows a particularly simple mechanical design, for example by means of a rotatably supported load wheel, on which a corresponding printing table is arranged. As a result, the manufacturing and printing costs for the printing device are reduced, and the uniform movement of the printing table is also ensured, whereby for example the substrate is prevented from slipping on the printing table during the movement. According to a preferred refinement of the invention, the mobile device has a carrier for the printing table which is rotatably mounted about a horizontal axis of rotation. The circular movement of the printing table can be achieved in a particularly simple manner by means of a rotatably mounted carrier. Since the axis of rotation is oriented horizontally, all rotational movements are carried out here in the vertical plane as previously described. The printing station is arranged spaced apart from the axis of rotation on the carrier such that the printing table moves on a circular path having a predetermined radius with respect to the horizontal axis of rotation. It is also preferred to provide that the carrier is designed as a carrier arm, a carrier roller or a carrier wheel. In an embodiment as a carrier arm, the carrier arm projects in particular radially from the rotational axis or a rotary joint which forms the rotational axis, up to the printing table. The carrier arm can also be designed to be curved or curved in a circular trajectory plane, for example to increase its load capacity. In an embodiment as a load bearing wheel, the load wheel is conveniently arranged coaxially with the axis of rotation as described above so as to be rotatable about the axis of rotation. Conveniently, the respective printing station is arranged spaced apart from the axis of rotation on the carrier arm or the carrier wheel, thereby following a circular path having a radius with respect to the axis of rotation. According to a preferred refinement of the invention, the mobile device has a plurality of carrier arms which are arranged in a particularly evenly distributed manner, each of which carries a printing table and is pivotally mounted about a rotational axis. To this end, the printing device has a plurality of printing stations, each of which is carried by a carrier arm. In particular, the carrier arms together form a star-shaped carrier wheel which is rotatably mounted on the housing or the like by means of a rotary joint about a horizontal axis of rotation. This is achieved by a preferred uniform distribution of the carrier arms, in which a balance occurs in the carrier wheel, so that unbalanced or uneven movements are avoided during operation. Conveniently, the carrying arms are designed to be identical, thereby simplifying manufacturing. Here, the carrying arms are either arranged on a common bottom ring or bearing ring which forms or together form the swivel bearing or are designed to be integral therewith to ensure a loadable structure. Alternatively, the adjacent carrier arms are connected to each other in the circumferential direction by at least one connecting piece to improve the load capacity and improve the precision of guiding the printing table. If the carrier is designed as a carrier wheel, the printing station can be arranged on the carrier ring at any position along the circumference of the carrier ring. In particular, it is provided that a plurality of printing stations are arranged in a particularly evenly distributed manner on the carrier ring, so that the carrier wheel also carries a plurality of printing stations. Or the carrying wheel is guided directly in the outer swivel bearing, so that the built-in bearing ring with the central swivel bearing can be omitted; or the carrying wheel has one or more supporting arms, which are oriented radially The inner portion extends towards the bottom ring or the bearing ring, which constitutes or together forms the central swivel bearing. Furthermore, the respective printing station is preferably pivotally supported in a pivotal axis (oriented parallel to the axis of rotation of the carrier). This makes it possible for the respective printing station to occupy the desired orientation independently of its position along the curved path, such that, for example, the printing table and the substrate placed thereon are always oriented horizontally, so that the substrate does not move on the printing table. . In this case, the mobile device preferably has at least one guide chute, which is designed in particular to guide the groove or the profile rail and interact with the respective printing station so that it is independent of its position along the curved path. The corresponding printing station is oriented horizontally. Thus, by mechanical guidance it is achieved that the printing station is always oriented horizontally, without the need for an additional drive for this purpose. In particular, it is proposed here that this horizontal orientation is ensured over the entire extent of the curved path. Alternatively, the horizontal orientation is oriented horizontally along only one section, ie the following section: ie from the supply device to the printing station and from the printing station to the section of the derivation device. In the return section of the curved trajectory leading from the deriving device to the supply device, the orientation of the printing station may not be horizontal. This can be advantageous, for example, in that a cleaning device or a cleaning station is provided in the section between the delivery device and the supply device, through which the printing station is guided. By means of the printing table being inclined obliquely with respect to the horizontal plane, for example, it is possible in this section to make it easier to dispense cleaning liquid or dirt from the printing station. It is also preferred to provide that the respective printing station has at least one guiding element that cooperates with the guiding chute to achieve a horizontal orientation. If the guiding chute is designed as a guiding groove, the guiding element is preferably designed to guide the pin shape, the guiding pin being inserted into the guiding groove and movably supported in the longitudinal extension direction of the guiding groove. If the guide groove is designed as a profile rail, it is preferably provided that the guide element is designed as a guide fork or the like which receives the profile rail at least in sections and thus also establishes a path along the curved path or the mobile device. Mechanical forced guidance of the guide chute. In this way, a simple mechanical forced guidance of the printing station and in particular a horizontal orientation are obtained. According to an alternative embodiment of the invention, it is preferred that the mobile device has at least one transmission assigned to the respective printing station and interacting with the rotary support, which always orients the respective printing station horizontally In particular, the rotary mount is coupled to the respective pivot joint for this purpose. Preferably, the transmission is formed by a plurality of drive wheels, at least two of which are mechanically operatively coupled to each other by a third drive wheel. By means of the transmission, a rotational movement or a pivoting movement is automatically caused in the respective printing station when the carrier is rotationally moved, so that the printing table is always oriented in the same direction, in particular always horizontally. Thus, for example, it is proposed that the rotary bearing is assigned a stationary or non-rotatable transmission wheel, in particular a drive gear, and that the respective printing station is assigned a drive wheel, in particular a driven gear, which rotates with the printing table. The drive gear and the driven gear are here operatively connected to one another by a third drive wheel, in particular an intermediate gear, wherein the gears each conveniently have the same radius to ensure the orientation of the printing table. Preferably, the intermediate gear is rotatably mounted on a respective carrier arm or support arm of the carrier. According to a preferred refinement of the invention, the supply device and the derivation device each have at least two carrier fingers for the substrate oriented parallel to one another, and the respective printing station has two phases associated with the carrier fingers Corresponding notches such that when the printing station is passed by the mobile device or the deriving device, the carrier fingers pass through the gaps. Thereby, the printing table and the supply device, as well as the printing table and the derivation device, overlap when the printing table moves along a curved trajectory, wherein the notches allow the carrier and the carrying fingers of the deriving device to pass through the printing station. Thereby the substrate on the carrier finger of the supply device is removed as the printing table moves along the curved track and the substrate is automatically output or rested onto the carrier finger of the export device. It is thereby achieved that the supply and the derivation of the substrate are at least substantially by the mobile device itself, so that the mechanical effort for supplying and deriving the substrate remains particularly low. Here, the curved trajectory is preferably designed with respect to the supply device and the derivation device such that the printing table passes by from the supply device from below to receive the substrate placed on the carrier finger; and passes over from the discharge device from above, so that The substrate placed on the printing table is placed on the carrying finger of the exporting device. It is also preferred to provide that each carrier finger is assigned a movable conveyor belt for transporting the substrate to or away from the carrier finger. This ensures that the respective substrate reliably enters the bearing finger area so that it can be reliably received by the respective printing station or reliably guided from the carrier finger. Conveniently, the conveyor belt of the derivation device is assigned a drive device and the conveyor belt of the derivation device is assigned another drive device to ensure independent operation of the conveyor belt. In this case, the conveyor belts are preferably controlled in such a way that the substrate is oriented as precisely as possible in order to avoid or to maintain as little as possible the subsequent realignment of the substrate on the printing table in the region of the printing device. . For this purpose, for example, it can be provided that an inspection device is provided in the region of the supply device, which monitors the orientation of the substrate on the carrier finger so that the conveyor belt can be controlled to change the orientation of the substrate when required. The supply device and the derivation device are preferably arranged in a vertical plane below the printing device, so that the above-described operating process can be carried out in a simple manner, wherein the curved path is in particular allowed to be designed as a circular path. . By the movement on the circular path, the corresponding printing table guides the substrate located thereon upwards in the direction of the printing device, so that the substrate for lifting in the direction of the printing device or the printing screen or the printing mask can also be omitted. Additional leverage mechanism. Alternatively, however, such an additional lever mechanism can additionally be provided. According to a preferred embodiment of the invention, at least one further processing station, checkpoint and/or cleaning station is provided along the curved path of the mobile device. Based on the advantageous design of the curved trajectory it is also possible to arrange other stations in the movement path of the printing station, which can be used to position, inspect and/or clean the printing table and/or the substrate. In particular, the return section of the curved track between the deriving means and the supply means is adapted to position the cleaning station for the or the printing station, such that, for example, the printing residue from the substrate to the printing station is re-delivered next The printed substrate is reliably removed from the printing station before. According to an advantageous embodiment, it is proposed, for example, that the cleaning station operates with a protective film or a protective pad, in particular made of paper. To this end, on each printing station supplied to the supply device, the protective pad is first placed by means of a cleaning station, the substrate resting on the protective pad. After the printing process is performed and the substrate is output to the exporting device, the printing station passes through the cleaning station again, where the now used and perhaps dirty pad is removed and replaced with a new pad. This makes it possible to achieve simple cleaning and maintenance cleaning of the printing stations or the corresponding printing stations in a simple manner. Alternatively or additionally, the cleaning station cleans the printing station by means of compressed air and/or pressure fluid before supplying another substrate. By means of an advantageous checkpoint between the supply device and the printing device, it is achieved that the orientation of the substrate for the printing screen or printing mask is checked before the substrate is supplied to the printing device and can be readjusted if necessary . To this end, the inspection station preferably has at least one camera device that optically monitors the orientation/arrangement of the substrates on the respective printing stations. The printing station itself or in particular the printing device and/or the printing mask has alignment means which allow subsequent alignment of the substrate on the respective printing station or the alignment of the printing mask/printing device relative to the substrate. Such an alignment device is known in principle and can be easily integrated into an advantageous printing device. According to a preferred refinement of the invention, a sliding device is arranged at the supply device and/or the derivation device, the sliding device being forcedly guided, in particular by the movement of the printing table along the curved path. The slider is moved to push the substrate from the supply station to and/or from the printing station to the derivation station. This is advantageous in particular when the delivery station and/or the supply station do not have the aforementioned conveyor belt. However, in addition to existing conveyor belts, sliding devices are also advantageous to ensure that the substrates are fully seated on the respective printing stations or are fully pushed from the respective printing stations onto the delivery device. In order to actuate the sliding device, the moving device preferably has a further guiding chute, which cooperates with the sliding device to actuate it so as to be from the supply station or the derivation station at each printing station. The slide is automatically actuated as it passes by, without the need for an additional drive for this purpose. Therefore, in the printing apparatus, only a plurality of moving processes are automatically performed by the rotational movement of the carrier, and only one driving device is required for the rotational movement of the carrier. The corresponding printing station advantageously includes a plurality of suction holes for sucking the substrate. Preferably, the suction holes are connected/connectable to the vacuum system at least in the region of the printing device, by means of which the vacuum at the suction opening can be adjusted to draw the substrate onto the printing table. As a result, it is simple and reliable to ensure that the respective substrate is fastened to the printing table, in particular during the printing process. It is also preferred to provide that the printing device is assigned a post device designed to lift the substrate from the respective printing station in the direction of the printing device and optionally to align the substrate relative to the printing device, And/or for sealing the notch of the printing head flush with the printing station during the printing process. Therefore, it is achieved by the pole device that the printing station forms a completely closed surface during this process so that the substrate does not sag or is not damaged by erroneous support on its back or bottom surface. Alternatively or in addition, the substrate can be raised and/or aligned by means of a mast device, for example to perform the alignment of the substrate with respect to the printing mask or the printing screen as already described. Furthermore, the printing device has a mechanical centering device which is designed to align the printing table with respect to the printing device, in particular the printing screen and/or the printing mask. The mechanical centering device thus has, for example, a centering pin having a centering shape, for example on a printing device, which can be inserted into the centering hole of the substrate and/or the corresponding printing station, or vice versa. In particular, when the substrate is lifted in the direction of the printing device by the printing station and/or the lifting column, a simple centering of the substrate relative to the printing device is thereby achieved. Alternatively or in addition, it is preferably provided that a plurality of guiding elements are provided in the printing device region, the guiding elements automatically aligning the printing table in at least one direction when the printing station is introduced into the printing device, in the manner of The relative position is such that it decreases in the direction of movement of the printing table and in the direction of the printing device to such a distance that the distance substantially corresponds to the relative theoretical position and orientation of the respective substrate. The mobile device preferably has a drive motor, in particular only one drive motor, which is preferably designed as an electric motor and is situated directly or via a shifting transmission and/or a stepper transmission with the carrier Operational connection. Thus, all or at least a majority of the movement of the mobile device is predetermined by the one drive motor. By means of the intermediate connection of the stepping gear, the electric motor can be operated continuously, for example in an optimal operating state, wherein the stepping drive ensures that the printing table does not move continuously along a curved path, but moves stepwise . This is a particularly simple and cost effective implementation for driving printing equipment.

Figure 1 shows in a side view a printing device for printing flat substrates, such as in particular printed circuit boards, wafers, solar cells and the like. For this purpose, the printing device has a printing device 2 which prints the substrate 5 supplied thereto, for example by means of a printing mask 3 and a doctor blade 4. For this purpose, the substrate 5 is placed on a printing table 6, which supplies the substrate 5 to the printing device 2. Furthermore, the printing apparatus 1 has a supply device 7 designed to supply the substrate 5 to the printing table 6 and a deriving device 8 designed to transport the printed substrate 5 from the printing table 6 Export again and for example to another processing machine. Furthermore, the printing device 1 has a moving device 9, which is designed to move the printing table 6 to move it from the supply device 7 to the printing device 2, from the printing device to the export device 8 and back. It is advantageously provided here that the mobile device 9 moves the printing table 6 over a curved path 10 designed to be circular, so that the printing table 6 follows a circular path and thus performs a continuous movement to reach the printing device 2 from the supply device 7 . The device 8 is exported and returned to the supply device 7. For this purpose, the mobile device 9 has a carrier which is embodied as a carrier wheel 11 . The carrier wheel 11 is rotatably and centrally supported on the housing 13 of the printing apparatus 1 by a rotary support 12, wherein the axis of rotation 14 formed by the rotary joint 12 is parallel to the ground 15, the printing apparatus 1 is erected on the ground or horizontally Oriented so that the carrier wheel 11 rotates in a vertical plane. The carrier wheel 11 has a bearing ring 16 assigned to the rotary joint 12, which is connected to the outer circular carrier ring 18 by a plurality of support rods 17, in particular in one piece. On the carrier ring 18, a plurality of printing stations 6 are evenly distributed on the circumference of the carrier ring 18. According to this embodiment, four printing stations 6 are provided on the carrier ring 18, but more or fewer printing stations 6 may be arranged thereon, as indicated by the additional printing station shown by the dashed lines. The respective printing table 6 is held on the carrier ring 18 by means of a pivoting support 19, wherein the pivoting support 19 forms a pivot axis about which the printing table 6 is pivotable and which is parallel to the pivoting axis The axis 14 is oriented. The carrier wheel 11 is assigned a drive motor 20 which is directly or preferably connected to the carrier wheel 11 by means of a stepping gear to drive the carrier wheel such that the printing table 6 moves about the axis of rotation 14 in a circular path. The printing table 6 is moved in such a way that the bearing surfaces provided by it for the respective substrate 5 are oriented horizontally, regardless of the position of the respective printing table 6 along the curved path 10 . Different solutions can be used to achieve this. In one case, for example, it is proposed that each printing table 6 is assigned an actuator (in particular an electric motor) which, depending on the position of the printing table 6 along the curved path 10, is printed directly or by means of a transmission. The table 6 pivots about the pivot axis of the swivel joint 19 such that the respective printing table 6 is always oriented horizontally. Other variations will be described in detail below. Instead of the embodiment shown here, the printing table 6 can also be arranged correspondingly on the carrying arm 17', which replaces, for example, one of the support rods 17, wherein the carrier ring 18 is omitted, as used in FIG. The dotted line is indicated at one of the support bars 17. According to the present embodiment, the supply device 7 and the derivation device 8 are located below the printing device 2 opposite to each other at substantially the same height. Here, the supply device 7 and the derivation device 8 are assigned to the carrier wheel 11 in such a way that the printing table 6 passes by the supply device 7 and the derivation device 8 as it moves along the curved path 10 (as indicated by the arrow 21). Since the drive motor 20 is advantageously connected to the load wheel 11 by means of a stepping gear, when the printing table 6 is at the level of the supply device 7 or the delivery device 8, although the drive motor 20 continues to operate, the load wheel 11 remains Stopping, the substrate 5 can be supplied to the printing station 6 there by means of the supply device 7 or the printed substrate can be led out of the printing station 6 located there by means of the derivation device 8. For this purpose, the supply device 7 and the derivation device 8 can have corresponding devices by means of which the substrate 5 can be transported to the respective printing station 6 or transported away from the respective printing table 6. The movement process is designed as follows. First, the substrate 5 is pushed onto the printing table 6 assigned to the supply device 7. Next, in the present embodiment, the carrier ring 11 is rotated by 90°, so that the printing table 6 is now assigned to the printing device 2, so that the substrate 5 located there can be printed. After the printing process is completed, the carrier ring is continued to be rotated by 90[deg.] so that the printing station 6, together with the now printed substrate, is either opposite the dispensing device 8 or assigned to the deriving device. There, the printed substrate 5 is taken out of the printing station 6 by the derivation device 8 and provided for further processing or use. The carrier wheel 11 is then further rotated by 90° so that the printing station is then again located below the printing unit 2, but the printing station is situated on the side facing away from the axis of rotation 14. A cleaning station 22 is optionally arranged there, by means of which the printing medium residues and the like on the currently idle printing table 6 are removed. To this end, the cleaning station 22 can be designed, for example, for wet cleaning of the printing station 6. When the carrying wheel 11 is moved by 90° for the next time, the currently cleaned printing table 6 is again sent to the supply device 7 to receive the new substrate 5. In addition, as shown in FIG. 1 , an inspection station 23 is optionally arranged between the supply device 7 and the printing device 2 in the direction of movement of the carrier wheel 11 , which has, for example, a camera sensor 24 , by means of which the sensor is sensed. The device is used to inspect the substrate 5 placed on the printing table 6. In particular, it is checked here whether the substrate 5 on the printing table 6 is correctly aligned, or whether it is the correct substrate or whether or not a substrate is located on the printing table 6, which is then supplied to the printing device 2. The obtained data can, for example, be used to align/align the substrate 5 for the printing device 2 on the printing table 6, or to align/align the printing device 2 with respect to the substrate, preferably printing screen/printing The mask allows the printing process to proceed successfully. According to an advantageous embodiment, the printing station 6 interacts with the supply device 7 and the derivation device 8 in such a way that the reception and output of the substrate 5 is automatically or at least supported by the movement of the respective printing table 6. 2 and 3 each show a supply device 7 or a delivery device 8 in a plan view, which cooperates with the printing table 6 to allow the substrate to be automatically raised and rested. For this purpose, FIG. 2 shows the printing device 1 in the region of the supply device 7 in a plan view. At its end facing the carrier wheel 11 , the supply device 7 has a transport device 25 , which has two carrier fingers 26 oriented parallel to one another, which project into the movement path of the printing table 6 . There may also be more than two carrier fingers 26 or only one carrier finger 26 oriented parallel to one another. FIG. 2 also shows for this purpose a section of the carrier wheel 11 together with one of the printing stations 6, which is situated exactly at the level of the supply device 7. Correspondingly, in particular, the printing table 6 has one, two or more indentations 27 oriented parallel to one another, corresponding to the bearing fingers 26 which are designed in such a way that when the printing table 6 is supplied The carrier finger 26 passes through the notch 27 as the device 7 passes by. The carrier fingers 26 preferably have a transportable conveyor belt 28 that can be transported along the longitudinal extension of the carrier fingers 26 to move the substrate 5 to the free end of the carrier fingers 7 and into the printing station 6. Move in the path. Therefore, if the substrate 5 (as indicated by the dashed box in FIG. 2) is placed at the end of the carrier finger 26 and the printing table 6 is supplied to the supply device 7 from below according to the embodiment of FIG. 1, the printing table 6 is approached from below The carrier fingers 26 receive the carrier fingers in the gaps 27 and remove the substrate 5 from the carrier fingers 26. This ensures that the substrate 5 is simply and reliably received by the printing table 6 during the movement of the carrier wheel 11. Figure 3 shows the corresponding mechanism on the derivation device 8. Like the supply device 7, the derivation device 8 also has corresponding carrier fingers 29 which can enter the indentation 27 of the printing table 6 or can pass through the indentations 27 as the printing station 6 passes by the deriving device 8. However, since the notch 27 on the printing table 6 is also opened in the direction of the same side as the one on the supply device 7, the carrier finger 29 is held in the radial direction on the carrier ring 11 and printed by the support member. The conveyor belt 29 is driven between the stages 6 and correspondingly so that the substrate 5 resting on the carrier fingers 26 by the corresponding printing table 6 is led out from the printing table 6. Here, the carrier fingers 26 pass through the gaps 27 and the printing table 6 moves downwards so that the respective substrates 5 are automatically rested on the carrier fingers 26. Overall, it is achieved that the mobile device 9 automatically implements the reception and output of the substrate 5 by the movement of the printing station 6, without necessarily requiring additional mobile devices. Thus, the supply device 7 and/or the derivation device 8 can also be designed without a conveyor belt in such a way that the substrate, for example, automatically slides into the removal position and the rest position, for example in such a way that the carrier fingers 26 are oriented obliquely. Alternatively, it can be provided that an extendable pin is arranged in or on the respective printing table 6 itself, which pins can be actuated in the following manner by means of the guide wheel 11 or the guide chute on the housing 13 The pressure pin is extended to lift the substrate 5 from the printing table 6, so that the removal device can be inserted between the printing table and the substrate, by which the substrate is removed from the printing table 6 as the printing table 6 continues to move. Automatically removed. Likewise, once the substrate is placed thereon by the supply device 7 and the printing station 6 continues to move in the direction of the printing device 2, the pins on the supply device are retracted. This also makes it possible to dispense with the notches 27 on the printing table 6. The motion system for moving the pins can be realized by a simple guiding chute on the supply device 7 and the delivery device 8. It is also conceivable to provide hydraulic or pneumatic actuation of the pin. 4A and 4B show the printing table 6 in the area of the printing unit 2 in a side view (Fig. 4A) and a top view (Fig. 4B). The printing device 2 is optionally assigned a mast device 30 such that the printing table 6 can be placed between the mast device 30 and the printing mask 3 by rotational movement. The mast assembly 30 has a post 31 that can be moved horizontally according to a double arrow as shown in Figure 4A. For the movement of the mast, for example, a rotatable cam 32 is provided which can lift the mast 31. Advantageously, two tab-like projections are formed on the mast 31 which are formed corresponding to the recesses 27 . If the post 31 is moved in the direction of the printing unit 2 or the printing mask 3, the tab-like projections 33 are each inserted into one of the notches 27 of the printing table 6, as shown in Fig. 4B, thereby being on the printing table. A flush-closed surface is produced on 6. Thereby, the substrate 5 is then completely placed flat on the printing table 6. Alternatively, the post device 30 can also be designed to lift the substrate 5 in the direction of the print mask 3 to facilitate the printing process. If this is not the case, the printing device 2 is advantageously designed to move down in the direction of the substrate 5 to perform the printing process. 5A and 5B show an advantageous embodiment of the printing apparatus 1 in a side view (Fig. 5A) and a sectional view (Fig. 5B), in which an advantageous drive for the pivotal movement of the printing table 6 is shown, the drive The device does not require a separate drive motor for the printing station 6. According to this embodiment, it is proposed that the transmission 34 acts between the printing table 6 and the carrier wheel 11, which transmits the rotational movement of the carrier wheel 11 to the printing station 6 in such a way that the printing stations are always oriented horizontally. of. The sectional view of FIG. 5B shows for this purpose a drive motor 20 whose driven shaft 35 is here directly connected in a rotationally fixed manner to the carrier wheel 11 in order to move the carrier wheel as described above. Furthermore, the printing table 6 is held on the carrier wheel 11 by means of a pivot bearing 19. For this purpose, the pivot bearings 19 each have a cylindrical bearing section or a bearing bolt 36 which is pivotally mounted in the carrier wheel 11 by means of a rolling-element bearing. Furthermore, drive wheels 37 are arranged correspondingly on the respective bearing bolts 36, which are connected in a rotationally fixed manner to the bearing bolts 36. The intermediate wheel 38, which is rotatably mounted on the carrier wheel 11, engages on the one hand with the drive wheel 37 and on the other hand with a driven wheel 39 which is fixed to the housing and which is arranged coaxially with the output shaft 35. If the load wheel 11 is now in rotational movement, the intermediate wheel 38 rotates on the driven wheel 39 and thus introduces rotational movement into the drive gear 37, which in turn rotates the bearing bolt 36 and thus the printing table 6 about the pivot axis. For reliable force transmission, the drive wheel 37, the intermediate wheel 38 and the driven wheel 39 are each designed as a gear having in particular toothings, wherein the gears are designed to be identical or at least each have the same radius, so that the printing table The orientation of 6 is always the same regardless of the position along the curved track 10. Another embodiment for moving the printing station 6 has been depicted in FIG. A circular guide chute 40 is depicted there, which is arranged in a manner fixed to the housing and interacts with the printing table 6 in such a way that the printing stations are always level. To this end, FIGS. 6A and 6B show a detailed view of the mobile device for the printing station 6 by means of the printing station 6. On the fixed disk or annular disk arranged parallel to the carrier wheel 11 of the printing apparatus 1, the guide groove 40 is designed as an axially projecting profile rail 41 in accordance with the embodiment of FIG. 6A. The section of the profile rail 41 is here chosen to be trapezoidal, but may also have other shapes, such as an I-shape or a T-shape. The respective printing table 6 has a guiding element 42 which interacts with and corresponds to the profile guide 41. In the embodiment of FIG. 6A, the guiding element is embodied as a guide fork, in which the profile guide 41 is partially embedded. In this case, the guiding element 42 is arranged on the printing table 6 at a distance from the axis of rotation or the rotary joint 19 so that the guiding element moves over the guiding slide 40 which extends offset from the movement path 10 . This makes it possible for the pivotable printing table 6 to be held in a horizontal orientation by the guide chute 40 without the need to use another drive motor for the respective printing table 6 for this purpose. The profile rail 41 or the guide chute 40 correspondingly extends over the entire movement path of the printing table 6 to maintain the desired orientation. Here, the horizontal orientation is advantageous at least in the section between the supply device 7, the printing device 2 and the derivation device 8, so that the substrate 5 is reliably held on the corresponding printing table 6. Alternatively, the printing table 6 is only held between the supply device 7, the printing device 2 and the export device 8 in a substantially horizontal orientation, so that processing tolerances and mounting tolerances are less required, and the corresponding printing station 6 is located together The substrate thereon is oriented on or in the printing device 2 with high precision or higher precision relative to the printing screen or printing mask of the printing device 2 by the mechanical centering device 45 described above. In the section leading from the derivation device 8 to the supply device 7 optionally through the cleaning station 22, a horizontal orientation is not necessarily necessary. Especially in the area of the cleaning station 22, an oblique orientation may be advantageous so that dirt particles, printing paste residues and the like can be removed from the printing table 6 more easily. In order to achieve this, the guiding chute 40 is not a circular trajectory in the region of the cleaning station 22, so that at least the inclined position of the printing table 6 is obtained on this moving section. FIG. 6B shows an alternative embodiment in which the guide chute 40 is designed as a chute recess chute 43 in a fixed disk or annular disk of the housing 13 and the guiding elements 42 of the respective printing table 6 are correspondingly Designed as a guide pin, the guide pin is engaged into the chute groove 43 and is supported therein in a longitudinally displaceable manner. The course of the guiding trajectory of the guiding chute 40 is selected here as described above. This gives the same advantages. Figure 2 shows another alternative development. The printing table 6 thus has a plurality of suction holes 44 which are connected or connectable to the vacuum system in order to generate a vacuum when required, by which the vacuum will be placed correspondingly on the substrate of the printing table 6. 5 is sucked onto the printing table 6 and thereby held on the printing table in a friction fit. This ensures that the substrate 5 does not fall off the printing table 6 and is stably held on the printing table, in particular during the printing process. Conveniently, all printing stations 6 are designed accordingly. It is also optionally provided that the printing device 2 has a mechanical centering device 45. The centering device 45 has one or more centering pins with lead-in bevels which can be inserted into the openings of the substrate 5 and/or the printing table 6 corresponding thereto so that the printing table and the printing mask are opposite When moving away from each other, the printing table and substrate 5 are automatically aligned with the printing mask. Alternatively, the printing table 6 is made relative to the printing device 2 by means of a mechanical guiding element or an directional element (such as a wedge-shaped pressing element, a wedge-shaped geometry, a roller centering device or a simple stop/stop surface) Is the relative orientation of the printing screen or printing mask. Figure 7 simplistically shows an embodiment for the design in which the respective substrate 5 is not lifted from the printing table 6 of the supply device 7, but instead, on the supply device 7, there is arranged for the substrate 5 to be moved To the device on the printing table 6. According to the embodiment of FIG. 7 , the supply device 7 has a sliding device 46 which is actuated by a guide groove 47 designed on the carrier wheel 11 and thus moved together: ie, at the printing station from the supply device 7 The slide device moves the slider 48 in the direction of the printing table 6 as it passes by. To this end, the slider 48 has on one hand a ridge which can be assigned to one side edge of the substrate 5 to urge the substrate onto the printing table 6 as it moves in the direction of the printing table 6; There is a guiding element 49 which cooperates with the guiding chute, for example as described with reference to Figure 6A or 6B. In this case, the sliding element 48 passes through the recess in the bearing surface of the supply device 7 , for example with the elevations, in order to move the substrate 5 from this bearing surface onto the printing table 6 . A corresponding slide 46 is optionally also assigned to the export device 8. The sliding device can also be combined with a conveyor belt to support and ensure the belt transfer. FIG. 8 shows an alternative design of the cleaning station 22. Instead of this, the cleaning station 22 is designed to be multi-stage. In the first station 22_1, the paper or pad film placed on the corresponding printing table 6 is removed from the printing table 6 after the substrate 5 is output to the exporting device 8. In the subsequent station 22_2, a new pad is taken from the warehouse 22_3 by the cleaning station 22 and placed on the printing table 6. Preferably, the pad is punched out in such a way that the pad has a plurality of holes which correspond to the suction opening 44 and in particular also to the cutout 27 so that in spite of the padding, the printing table can be used. The above processing of the substrate 5 is achieved on 6. Alternatively, the mat does not have a hole corresponding to the suction hole 44 so that the substrate is sucked through the paper. The printing table 6 with the new pad is then supplied to the supply device 7 so that the substrate 5 is placed on the pad on the printing table 6. This ensures that the printing station 6 and the printing unit 2 are simply kept clean. The above embodiments allow for a simple, energy efficient, space saving and high throughput flat substrate printing process. The embodiments can be combined with one another to meet different boundary conditions.

1‧‧‧Printing equipment

2‧‧‧Printing device

3‧‧‧Printing mask

4‧‧‧ scraper

5‧‧‧Substrate

6‧‧‧Printing table

7‧‧‧Supply

8‧‧‧Exporting device

9‧‧‧Mobile devices

10‧‧‧Bend track

11‧‧‧Load wheel

12‧‧‧Rotary support, swivel joint

13‧‧‧Shell

14‧‧‧Rotation axis

15‧‧‧ Ground

16‧‧‧ bearing ring

17‧‧‧Support rod

17'‧‧‧ carrying arm

18‧‧‧ Carrying ring

19‧‧‧ pivot bearing

19‧‧‧Rotary joints

20‧‧‧Drive motor

22‧‧‧ cleaning station

22_1‧‧‧First stop

22_2‧‧‧Subsequent stations

22_3‧‧‧Warehouse

23‧‧‧Checkpoint

25‧‧‧Transfer device

26‧‧‧ bearing finger

27‧‧‧ gap

28‧‧‧Conveyor belt

29‧‧‧Conveyor belt

30‧‧‧ pole device

31‧‧‧ pole

34‧‧‧Transmission

35‧‧‧ driven shaft

36‧‧‧bearing bolts

37‧‧‧Drive wheel

38‧‧‧Intermediate round

39‧‧‧ driven wheel

40‧‧‧Guide chute

41‧‧‧Profile rails

42‧‧‧Guide elements

43‧‧‧Slot groove

44‧‧‧ suction hole

45‧‧‧Centering device

46‧‧‧Sliding device

47‧‧‧Guide chute

48‧‧‧Sliding parts

49‧‧‧Guide elements

The above features can obviously also be implemented in the printing device in any combination. In order to better understand the present invention, the following detailed explanation will be made with reference to the accompanying drawings. In the drawings: FIG. 1 shows a printing apparatus in a simplified side view, FIG. 2 shows a supply device of a printing apparatus in a plan view, FIG. 3 shows a drawing apparatus of a printing apparatus in a plan view, and FIGS. 4A and 4B are side views. And a top view showing the pole device of the printing apparatus, Figs. 5A and 5B show a first embodiment of the moving device of the printing apparatus, Figs. 6A and 6B show a second embodiment of the moving device, and Fig. 7 shows an optional Improvements and Figure 8 shows an alternative design of the cleaning station of the printing device.

Claims (20)

A printing device (1), in particular for printing a flat substrate (5), in particular a solar cell, a wafer, a printed circuit board or the like, having: at least one movable printing station (6) assigned a printing device (2), a supply device (7) for supplying the substrate (5) to the printing table (6), and a deriving device (8) for deriving the substrate (5) from the printing table (6), The printing table (6) can be forcibly guided to move along the curved path (10) by the moving device (9), so that the printing table sends the substrate (5) from the supply device (7) to the The printing device (2) is sent from the printing device (2) to the export device (8). The printing apparatus of claim 1, wherein the curved trajectory (10) is designed as a closed curved trajectory (10) such that the printing table (6) can be derived therefrom along the curved trajectory (10) The device (8) continues to move to the supply device (7). The printing apparatus of claim 1, wherein the curved trajectory (10) is located in a vertical plane. The printing apparatus of claim 1, wherein the curved trajectory (10) is a circular trajectory. The printing apparatus according to claim 1, wherein the moving device (9) has a rotatably supported around a horizontal axis of rotation (14) of the rotary support (12) for the printing table (6) Carrier. The printing apparatus of claim 5, wherein the carrier has at least one carrying arm (17') or one carrying wheel (11). The printing device according to claim 5, wherein the mobile device (9) has a plurality of carrier arms (17') arranged in a particularly evenly distributed manner, each carrying a printing table (6) and The rotatably supported support is rotatably supported about the axis of rotation (14). The printing apparatus of claim 6, wherein a plurality of printing stations (6) are evenly distributed on the carrying wheel (11). A printing apparatus as claimed in claim 8, wherein the respective printing table (6) is pivotally supported about a pivot axis oriented parallel to the axis of rotation (14). The printing device of claim 8 wherein the moving device (9) has at least one guiding chute (40) fixed to the housing, in particular a profile rail (41) or a chute guide ( 43) The guiding chute cooperates with a corresponding printing station (6) to orient the respective printing table (6) horizontally independently of its position along the curved path (10). The printing apparatus of claim 8, wherein the mobile device (9) has at least one transmission (34) assigned to the corresponding printing station (6) and cooperating with the rotary support (12), The transmission always aligns the respective printing table (6) horizontally and, for this purpose, in particular connects the rotary bearing (12) to the respective pivoting joint (19). The printing apparatus of claim 8, wherein the supply device (7) and the derivation device (8) each have at least two carrier fingers (26) for the substrate (5) oriented in parallel with each other. 29), and the corresponding printing station (6) has two notches (27) open at the edges corresponding to the carrying fingers (26, 29), so that when the printing station (6) is moved by the mobile device (9) The carrier fingers (26, 29) pass through the gaps (27) as they pass by the supply device (7) or the delivery device (8). The printing apparatus of claim 12, wherein each of the carrier fingers (26, 29) is assigned a movable conveyor belt (28) for transporting the substrate (5) to the carrier finger (26, 29) or leave it away from the carrier finger (26, 29). The printing apparatus according to claim 1, wherein the supply device (7) and the derivation device (8) are arranged below the printing device (2). A printing apparatus as claimed in claim 1, wherein at least one further processing station, checkpoint and/or cleaning station (23, 22) is arranged along the curved track (10). A printing apparatus as claimed in claim 1, wherein the supply device (7) and/or the derivation device (8) are each assigned a sliding device (46), in particular by means of the carrier Movement of the curved track (10) to move the slider (48) in a forced guiding manner, the slider pushing the substrate (5) from the supply device (7) to the printing station (6) and/or from The printing station (6) is pushed to the derivation device (8). The printing apparatus according to claim 8, wherein the corresponding printing table (6) has a plurality of suction holes (44) for sucking the substrate (5). The printing apparatus of claim 8, wherein the printing device (2) is assigned a pole device (30) designed to move the substrate (5) from the corresponding printing station (6) lifting in the direction of the printing device (2) and/or for flushing the notches (27) in the printing station (6). The printing apparatus according to claim 1, wherein the printing device (2) has a mechanical centering device (45) designed to relatively treat the printing table (6) Oriented to the printing device (2). The printing device as claimed in claim 1, wherein the mobile device (9) has a drive motor, in particular only one drive motor (20), in particular an electric motor, directly or via a shifting transmission And/or the stepper drive is in operative connection with the carrier.