Method for a computer to control a screen printing machine, computer-controlled screen printing machine

Abstract

The present invention relates to a computer-implemented method for controlling a screen printing machine, the method comprising clamping a substrate onto a printing plate of the screen printing machine; automatically printing a printing paste through a screen of the screen printing machine by means of a squeegee of the screen printing machine to produce a printed pattern on the substrate after clamping, wherein a computer device of the screen printing machine pulls the squeegee along the X-axis on the screen at a squeegee speed by means of a squeegee drive of the screen printing machine; determining a deviation between an actual dimension of the printed pattern along the X-axis during or after printing and a corresponding theoretical dimension of the printed pattern; calculating, by the computer device, at least one plate speed of the printing plate to compensate for the deviation; and moving, during printing or during another printing, the printing plate along the X-axis at at least one plate speed by means of a plate drive by the computer device. The present invention also relates to a screen printing machine for implementing the method.

Description

Technical Field

[0001] The present invention relates to a method for controlling a screen printing machine, comprising fastening a substrate to a printing plate, printing a printing paste through the screen with the aid of a scraper to produce a printing pattern on the substrate, and moving the printing plate relative to the screen during printing to compensate for the deviation between the actual size of the printed pattern and the theoretical size of the printed pattern.

[0002] The invention also relates to a screen printing press for implementing the method, the screen printing press comprising at least one squeegee drive for translating a squeegee of the screen printing press relative to a screen of the screen printing press and a plate drive for translating a printing plate of the screen printing press. Background Art

[0003] In known screen printing machines, the screen stretches in the direction of movement of the screen due to the friction between the squeegee and the screen. As a result, the printed pattern also stretches in the direction of movement and becomes distorted relative to the theoretical dimensions preset by the screen. The degree of distortion depends on a number of parameters that are partially difficult to control, such as the aging of the screen, screen stress, the embodiment and material of the screen weave (e.g. the thickness of the screen weave), the properties of the printing paste material that generally reduce the friction coefficient between the squeegee and the screen, the setting angle of the squeegee, the squeegee properties and the squeegee pressure, the ambient temperature and the air humidity.

[0004] The dimensions of the printed pattern cannot therefore be predicted exactly, which is problematic in particular for functional applications such as printed batteries, displays, photovoltaic modules or thermal modules, which depend on the exact positioning and dimensions of the components.

[0005] Patent application DE1561112A describes a method for compensating for offsets in screen printing, wherein, when using a squeegee, a controlled mechanical device moves the screen frame or the printed substrate by a deflection determined during printing in the opposite direction of the squeegee. This method only compensates for the offset between successive printed layers in the opposite direction of the squeegee, but does not compensate for distortions of the printed pattern during printing.

[0006] Patent application DE 2743234 C2 describes a screen printing device in which the screen frame is continuously moved against the elongation direction of the screen by a lever system during the printing process, thereby reducing distortion of the printed pattern.

[0007] Patent application WO9116202A1 also describes a screen printing machine in which the screen is moved purely mechanically during printing in order to reduce distortion of the printed pattern.

[0008] The disadvantage of the aforementioned method is that it cannot completely compensate for distortions due to the limited accuracy of the mechanical movement device and furthermore significantly complicates the design of the screen printing machine. Summary of the invention

[0009] The object of the present invention is to provide a method for controlling a screen printing machine which is easily implementable and a cost-effective screen printing machine, so that functional layers can be printed efficiently, reliably and with a high degree of precision.

[0010] The subject matter of the invention provides a method for achieving this object according to claim 1. This object is also achieved by a screen printing machine according to claim 8. Advantageous embodiments are revealed in the dependent claims.

[0011] The present invention relates to a computer-implemented method for controlling a screen printing machine, which has at least one scraper driver for translating a scraper of the screen printing machine relative to a screen of the screen printing machine at least along an X-axis parallel to the screen, at least one plate driver for moving a printing plate of the screen printing machine relative to the screen at least along the X-axis, and at least one computer device communicatively connected to the scraper driver and the plate driver.

[0012] It is advantageous for the method if the doctor blade drive and the plate drive are electric drives which can be controlled by a computer system, since this ensures a higher required precision and reproducibility than with pneumatic or manual drives commonly used in screen printing machines.

[0013] It is not essential to the invention that the plate drive generates a relative movement between the printing plate and the screen by means of a movement of the printing plate and / or the screen relative to the environment of the screen printing press.

[0014] The method comprises fastening the substrate to the printing plate. The fastening advantageously ensures that the substrate to be printed does not move relative to the printing plate, whereby the printed pattern may also move and / or become distorted.

[0015] The method includes automatically printing a printing paste through a screen by means of a squeegee to produce a printed pattern on a substrate after fastening, wherein a computer device pulls the squeegee over the screen along an X-axis at a squeegee speed via a squeegee drive.

[0016] The method comprises determining the deviation of the actual size of the printed pattern along the X axis from the corresponding theoretical size of the printed pattern during or after printing. The deviation is in particular a distortion of the printed pattern caused by the elongation of the screen during printing.

[0017] The method comprises determining a plurality of deviations, for example taking into account the deviation from a position along the X-axis according to the elongation of the wire mesh. The elongation may for example vary according to the distance from a wire frame carrying the wire mesh or according to the density of interruptions of the wire mesh along the X-axis.

[0018] The method comprises calculating at least one plate speed of the printing plate to compensate for the deviation by means of a computer device.The method may comprise calculating a plurality of plate speeds, in particular speed characteristics, for example, depending on the position of the squeegee along the X-axis during printing.

[0019] The method includes moving the printing plate along the X-axis at at least one plate speed by means of a plate drive via a computer device.

[0020] When determining after printing, move in another printing. Printing can comprise imprinting on a test substrate in this case, and only when continuing printing, the substrate that needs to be printed in the continuing printing is printed.

[0021] If determined during printing, the movement can also be carried out during printing to achieve a particularly fast printing process. In this case, in particular, time-consuming and expensive separate stamping on the test substrate is omitted.

[0022] During printing, the computer device preferably pulls the scraper over the screen by means of at least one servomotor of the scraper drive. During displacement, the computer device preferably moves the printing plate by means of at least one servomotor of the scraper drive. The servomotors enable particularly precise and reproducible translation of scraper and printing plate, and in particular the computer device can control the displacement of the printing plate as a function of the translation of the scraper, for example in a master-slave operation method.

[0023] The computer device preferably measures the speed of at least one of the servomotors by means of an absolute value sensor of the servomotors. As a result, the computer device can regulate the speed particularly accurately and reproducibly in a closed control loop.

[0024] The absolute value sensor particularly preferably provides a local resolution of the scraper position of the scraper or the plate position of the printing plate along the X axis of 0.1 μm to 100 μm, particularly preferably 1 μm to 10 μm, for example 4 μm. A high resolution that is not necessary for printing typical printing effects allows the printing of functional layers with a high integration density, for example by printing circuits.

[0025] The fastening of the substrate to the printing plate preferably includes automatically sucking the substrate onto the printing plate by means of a printing plate vacuum fastening device controlled by a computer device. Thin and flexible substrates, such as films, can also be reliably and uniformly fastened to the printing plate by suction. The vacuum fastening device can be designed, for example, as described in the patent application DE 10 2011 012 870 A1.

[0026] Determining at least one deviation of the actual size of the printed pattern from the corresponding theoretical size preferably comprises determining the actual size of the printed pattern along the X axis after printing and calculating the deviation (Δx) as the theoretical size (x) in particular by means of a computer. s ) and actual size (x i ):Δx=x i -xs .

[0027] After printing, the actual size is particularly simple to determine, since the substrate can be removed from the screen so that the printed pattern can be accessed. Determining can, for example, include manually measuring the actual size, for example by means of a vernier caliper. The measured actual size or the difference between the corresponding theoretical size and the actual size can then be entered in a computer device for the next method.

[0028] Determining at least one deviation of an actual size of the printed pattern from a corresponding theoretical size preferably includes determining the actual screen size of the screen behind the squeegee along the X-axis with respect to the direction of movement of the squeegee during printing and calculating the deviation from the difference between the corresponding theoretical screen size and the actual screen size of the screen, in particular by means of a computer device.

[0029] The advantage of obtaining during printing is that the screen elongation can be compensated during printing, thereby eliminating the necessity of a separate stamping which generates additional costs. After the squeegee, there is usually no or only a small amount of printing paste on the screen, which can be used to obtain the actual size.

[0030] Since the actual size is not determined exactly at the contact surface between the squeegee and the screen, but afterwards, the deviation in the printed pattern is not completely consistent with the difference between the theoretical screen size of the screen and the actual screen size determined, but must be calculated therefrom by determining the distance between the position and the contact surface using a correction factor. The correction factor can be determined, for example, by a calibration device of the screen printing machine.

[0031] In the simplest case, the actual size is determined by measuring the screen interruptions in the screen for printing the printing pattern.

[0032] The screen preferably comprises a model for deriving at least one actual screen measurement. The model may, for example, comprise a plurality of markings spaced apart from one another along the X-axis, such as points or lines, in particular perpendicular to the X-axis. The markings may, for example, be designed to reflect light for deriving the actual dimensions.

[0033] The actual size of the printed pattern and / or the actual screen size of the screen is preferably determined at a plurality of positions of the printed pattern and / or the screen which are spaced apart from one another along the X-axis. Deviations of the actual size of the printed pattern from the corresponding theoretical size which are dependent on the position along the X-axis can thereby be determined. From the deviations which are dependent on the position along the X-axis, the plate speed which is dependent on the position along the X-axis can be calculated to compensate for one of the deviations. In this way, the effects of a variable screen elongation along the X-axis can be compensated.

[0034] The actual size of the printed pattern and / or the actual screen size of the screen are preferably determined at a plurality of positions of the printed pattern and / or the screen which are spaced apart from one another perpendicularly to the X-axis. This results in the advantage that possible shearing of the screen due to a variable elongation perpendicularly to the X-axis can be detected. This shearing can be caused, for example, by a variable pressing force of the scraper on the screen along the X-axis, for example, due to an improper installation of the scraper. When the computer device detects shearing, for example, an error message or a warning message can be output to the user of the screen printing machine.

[0035] Preferably, the actual size of the printed pattern and / or the actual screen size of the screen is determined automatically by a computer device with the aid of a sensor system of the screen printer that is communicatively connected to the computer device. Particularly high speed and accuracy can be achieved by automatically determining.

[0036] The sensor system may, for example, include at least one imaging laser scanner to visualize at least a portion of the printed pattern and / or screen.

[0037] The sensor system preferably uses ultraviolet light, visible light and / or infrared light to determine the actual size of the printed pattern and / or the actual size of the screen. This can be determined contactlessly and accurately and cost-effective components can be provided for constructing the sensor system.

[0038] The wavelength of the light used to determine the actual screen size is preferably selected such that the printing paste used for this wavelength is at least partially transparent, so that any printing paste residues on the screen are not prevented from determining the actual screen size.

[0039] The determination preferably includes the use of an image recognition algorithm on a photograph of the printed pattern and / or the screen taken by means of a camera of the sensor system. By using the photograph, the determination can be automated with low hardware expenditure.

[0040] The print pattern and / or screen has a local resolution of 0.1 μm to 100 μm, particularly preferably 1 μm to 10 μm, for example 4 μm, along the X axis. A high resolution that is not necessary for the printing of typical printing effects can compensate for screen stretches particularly precisely at high integration densities, for example for printing functional layers, such as printed circuits.

[0041] When the deviation is positive, the calculation preferably produces a plate speed in the same direction as the squeegee speed. When the deviation is negative, the printed pattern is elongated along the X axis relative to its theoretical size. This elongation can be compensated by moving the printing plate in the same direction as the squeegee. Correspondingly, when the deviation is negative, the plate speed is preferably opposite to the squeegee speed and the printed pattern is contracted along the X axis relative to its theoretical size.

[0042] This calculation preferably yields the following plate velocity (v P ), the plate speed corresponds to the scraper speed (v R) multiplied by the deviation (Δx) divided by the theoretical size (x s ):v P =v R *Δx / x s In this case, the ratio of the plate speed to the squeegee speed corresponds to the ratio of the deviation to the theoretical size. The reason is that at this plate speed, distortions of the printed pattern can be avoided to the greatest extent possible.

[0043] The invention relates to a computer-controlled screen printing machine for carrying out the method according to the invention. The screen printing machine comprises at least one, in particular electric, squeegee drive for translating a squeegee of the screen printing machine relative to a screen of the screen printing machine at least along an X-axis parallel to the screen, at least one, in particular electric, plate drive for translating a printing plate of the screen printing machine relative to the screen at least along an X-axis, and at least one computer device connected in communication with the squeegee drive and the plate drive.

[0044] In particular, components of a screen printing machine can be designed to have the advantages mentioned here as described in accordance with the method according to the invention.

[0045] The scraper drive and / or the plate drive preferably each comprise at least one servomotor which is communicatively connected to a computer device.

[0046] At least one servo motor preferably includes at least one absolute value sensor connected to the computer device for communication, wherein the absolute value sensor preferably provides a local resolution of the scraper position of the scraper or the plate position of the printing plate along the X-axis of 0.1 μm to 100 μm, particularly preferably 1 μm to 10 μm, for example 4 μm.

[0047] The screen printing machine preferably includes a sensor system connected to a computer device for automatically determining the actual size of a printing pattern printed by the screen printing machine along the X-axis and / or the actual screen size along the X-axis, wherein the sensor system preferably includes a camera for taking photos of the printing pattern and / or the screen, and the local resolution along the X-axis is particularly preferably 0.1 μm to 100 μm, particularly preferably 1 μm to 10 μm, for example 4 μm.

[0048] The printing plate preferably includes a vacuum fastening device that is communicatively connected to the computer device to suck the substrate to be printed by the screen printer onto the printing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Further advantages, purposes and features of the invention are described with reference to the following description and the accompanying drawings which illustrate the subject matter of the invention by way of example. Features which are essentially identical in function in the drawings may be denoted by the same reference numerals, without these features having to be indicated and explained in all drawings.

[0050] Figure 1A schematic perspective view of a screen printing machine according to the present invention is shown.

[0051] Figure 2 Shows Figure 1 A schematic three-dimensional diagram of a printing plate of a screen printing machine.

[0052] Figure 3 A schematic diagram of a method for controlling a screen printing machine according to the present invention is shown.

[0053] Figure 4 A schematic diagram showing another method for controlling a screen printing machine according to the present invention is shown.

[0054] Figure 5 A schematic top view of a screen of the screen printer 100 during printing is shown. DETAILED DESCRIPTION

[0055] Figure 1 A schematic stereoscopic view of a screen printing machine 100 according to the present invention is shown, wherein the screen printing machine has at least one screen 120, at least one scraper 110, at least one scraper driver 130 for translating the scraper 110 relative to the screen 120 along an X-axis X parallel to the screen 120, and at least one computer device 140 for controlling the screen printing machine 100.

[0056] To this end, the computer device 140 may be wirelessly or wiredly connected to the remaining components of the screen printing machine 100. For the sake of clarity, the communication connection is not shown.

[0057] The scraper drive 130 comprises, for example, four electric motors 130A, 130B, 130C, 130D, in particular servomotors, for example, two of which are used to translate the scraper 110 vertically along the Z axis Z, another electric motor 130B is used to rotate the scraper 110 around the Y axis Y, and another electric motor 130D is used to translate the scraper 110 and preferably the flow scraper 170 of the screen printing machine 100 horizontally along the X axis X.

[0058] The screen printer 100 preferably includes a screen driver 121 in communication with a computer device 140 to translate the screen 120 along a Z-axis Z relative to the substrate.

[0059] The screen printing machine 100 preferably includes a flow scraper 170 for distributing printing paste on the screen 120 and a flow scraper driver 171 that is communicatively connected to the computer device 140, the flow scraper driver being used to translate the flow scraper 170 along the X-axis X and along the Z-axis Z relative to the screen 120 and to rotate the flow scraper 170 around the Y-axis Y relative to the screen 120.

[0060] The flow scraper drive 171 includes, for example, three electric motors 171A, 171B, and 171C, of ​​which two electric motors 171A and 171C are used to vertically translate the flow scraper 170 along the Z-axis Z, and the other electric motor 171B rotates the flow scraper 170 around the Y-axis Y.

[0061] The screen printer 100 preferably includes a frame 180 carrying at least one squeegee 110 and at least one flow squeegee 170 and a frame driver 181 communicatively connected to the computer device 140 to translate the frame 180 along the Z-axis Z relative to the screen 120 .

[0062] The screen printer 100 also includes a printing plate to accommodate the substrate to be printed. Figure 2 The substrate is shown alone in FIG.

[0063] Figure 2 Shows Figure 1 Schematic perspective view of a printing plate 160 of a screen printing machine 100 in FIG. The screen printing machine 100 preferably includes a printing plate driver 161 that is communicatively connected to the computer device 140, and the printing plate driver, for example, has at least one servo motor to translate the printing plate 160 relative to the screen 120 along the X-axis.

[0064] Figure 3 A schematic diagram of a method 200 according to the invention for controlling a screen printing machine 100 according to the invention is shown. The method 200 comprises fastening 201 a substrate to a printing plate 160 of the screen printing machine 100, for example by sucking the substrate by means of a vacuum fastening device.

[0065] The method 200 includes automatically printing 210 a printing paste through a screen 120 of the screen printer 100 by means of a squeegee 110 of the screen printer 100 to produce a printed pattern on a substrate after being fastened 201, wherein a computer device 140 of the screen printer 100 pulls the squeegee 110 on the screen 120 along an X-axis at a squeegee speed by means of a squeegee driver 130 of the screen printer 100.

[0066] The method 200 comprises determining 220 a deviation of an actual dimension of a printed pattern along an X-axis X from a corresponding theoretical dimension of the printed pattern, for example after printing 210. Determining 220 comprises, for example, deriving 221 an actual dimension of the printed pattern along the X-axis after printing 210 and calculating 222 the deviation as a difference between the theoretical dimension and the actual dimension.

[0067] The method 200 includes calculating 222 a plate velocity of the printing plate 160 to compensate for the deviation via the computer device 140 .

[0068] The method 200 includes moving 230 the printing plate 160 along the X-axis X at a plate speed by means of the plate driver 161 via the computer device 140 .

[0069] After the substrate has been replaced by another substrate, for example during a further printing 210 , a displacement 230 is carried out and the further substrate is fastened 201 to the printing plate 160 .

[0070] Figure 4 A schematic diagram of a further method 200 according to the invention is shown for controlling a screen printing machine 100 according to the invention, in particular.

[0071] Method 200 and Figure 3 The method 200 shown differs in that during printing 210 , deviations of actual dimensions of the printed pattern from corresponding theoretical dimensions are determined.

[0072] Determining 220 includes, for example, determining 221 an actual screen size of screen 160 along the X-axis behind squeegee 110 in the direction of movement of squeegee 110 during printing 210 and calculating 222 a deviation of the actual screen size from a corresponding theoretical screen size of screen 160 .

[0073] This also advantageously makes it possible to move 230 the printing plate 160 during printing 210 without requiring a separate stamping.

[0074] Figure 5 A schematic top view of a screen 120 of a screen printing machine 100 according to the invention is shown, in particular during printing 210 in a method 200 according to the invention.

[0075] During printing 210, the blade moves in the direction of motion at a speed v R The squeegee 110 is pulled over the screen 120 along the X-axis.

[0076] The visible upper side of the screen 120 is printed with the printing paste DP before the squeegee 120 in the direction of movement and is printed substantially without the printing paste DP after the squeegee 120 in the direction of movement.

[0077] exist Figure 5 The theoretical screen size xs of the screen 160 along the X-axis X is also plotted according to the position along the X-axis X. s Corresponding to the actual screen size xs i The difference xs s -xs i Schematic curve of .

[0078] After an instantaneous position of the squeegee 110 along the X-axis X, the screen 120 is stretched so that the difference xs s -xs iThe screen 120 contracts before the instantaneous position of the squeegee 110 along the X-axis X, so that the difference xs s -xs i is negative. Difference xs s -xs i The values ​​of decrease gradually from the instantaneous position of the scraper 110 to the edge of the screen 120.

[0079] In the simplest case, the difference xs s -xs i The value of decreases monotonically, but it may also have local limiting values, for example when the wire mesh 120 is more significantly elongated in the region of the interruption 123 of the wire mesh 120 than outside this region.

[0080] In this more significantly elongated region, the actual size of the printed pattern along the X axis deviates more from the corresponding theoretical size than outside this region, so that a higher plate speed is required in this region than outside this region to compensate for the deviation.

[0081] The wire mesh 160 includes, for example, a method for deriving 221 at least one actual wire mesh dimension xs i Model 122. At least one model 122, for example, includes a plurality of lines spaced apart from each other along the X-axis X and perpendicular to the X-axis, and the lines are preferably acquired by a camera system of a screen printer.

[0082] The wire web 160 can include a plurality of, for example two, patterns 122 spaced apart from one another perpendicularly to the X-axis. This results in the advantage that a possible shearing of the wire web by a variable extension perpendicularly to the X-axis can be detected.

[0083] Reference numerals list

[0084] 100 Screen printing machine

[0085] 110 Scraper

[0086] 120 Silk Screen

[0087] 121 Screen Driver

[0088] 122 Model

[0089] 123 Interruption Department

[0090] 130 Scraper drive

[0091] 140 Computer equipment

[0092] 150 Sensor System

[0093] 160 Printing Plate

[0094] 161 Board Driver

[0095] 170 Flow Scraper

[0096] 171 Flow scraper drive

[0097] 180 Frame

[0098] 181 Frame Driver

[0099] 200 Methods

[0100] 201 Fastening

[0101] 210 printing

[0102] 220 OK

[0103] 221 concluded

[0104] 222 Calculation

[0105] 230 Mobile

[0106] DP Printing Paste

[0107] v P Board speed

[0108] v R Scraper speed

[0109] xs i Actual size

[0110] xs s Theoretical size

[0111] Δx Deviation

[0112] xs i Actual screen size

[0113] xs s Theoretical screen size

[0114] XX axis

[0115] YY Axis

[0116] ZZ Axis

Claims

1. A computer-implemented method (200) for controlling a screen printing machine (100), wherein the screen printing machine include: a) at least one electric squeegee drive (130) for translating a squeegee (110) of a screen printer (100) relative to a screen (120) of the screen printer (100) at least along an X-axis (X) parallel to the screen (120), b) at least one electric plate drive (161) for translating a printing plate (160) of the screen printing machine (100) relative to the screen (120) at least along an X-axis (X), and c) at least one computer device (140) in communication with said scraper driver (130) and said plate driver (161), The method comprises the following steps: d) fastening (201) a substrate onto the printing plate (160); e) automatically printing (210) a printing paste (DP) through the screen (120) by means of the squeegee (110) to produce a printed pattern on the substrate after the fastening (201), e1) wherein the computer device (140) is driven by the scraper driver (130) at a scraper speed (v R ) pulling the scraper (110) on the screen (120) along the X-axis (X); f) removing the substrate from the screen (120) after said printing (210); g) determining (220) the actual size (x) of the printed pattern along the X axis (X) during said printing (210) i ) and the corresponding theoretical size of the printed pattern (x s ) at least one deviation (Δx); h) calculating (222) at least one plate speed (v) of the printing plate (160) by means of the computer device (140); P ) to compensate for the deviation (Δx); and i) during the printing (210) or during another printing (210), the printing plate (160) is moved by the computer device (140) with the aid of the plate drive (161) at at least one plate speed (v P ) moves along the X axis (X) (230), The actual size of the printed pattern (x i ) and the corresponding theoretical size (x s The determination (220) of at least one deviation (Δx) of the ) comprises the following steps: i1) after the printing (210), the actual size (x) of the printed pattern along the X axis is obtained (221) i )and i2) calculating (222) the deviation (Δx), wherein the deviation (Δx) is the theoretical size (x s ) and the actual size (x i ) i -x s ); Wherein the plate speed (v P ) corresponds to the scraper speed (v R ) and the deviation (Δx) divided by the theoretical size (x s ) is the product of the quotients of .

2. The method according to claim 1, It is characterized in that a) during the printing (210), the computer device (140) pulls the scraper (110) on the screen (120) by means of at least one servo motor of the scraper drive (130), and b) during said movement (230) said computer device (140) moves said printing plate (160) by means of at least one servomotor of said plate drive (161), The computer device (140) measures the speed of at least one of the servo motors by means of an absolute value sensor of the servo motor.

3. The method according to claim 1, It is characterized in that The step of fastening the substrate (201) to the printing plate (160) includes automatically sucking the substrate onto the printing plate (160) by means of a vacuum fastening device (162) of the printing plate (160) controlled by the computer device (140).

4. The method according to claim 1, It is characterized in that a) The actual size of the printed pattern along the X axis (x i ) is derived (221) at a plurality of positions of the printed pattern spaced apart from each other along the X-axis, b) wherein the determination (220) of at least one deviation (Δx) results in a deviation (Δx) that is dependent on the position along the X-axis, c) where, for at least one plate velocity (v P ) calculation (222) yields a plate velocity (v) that depends on the position along the X axis P ).

5. The method according to claim 1, It is characterized in that a) obtaining (221) the actual size (x) of the printed pattern by means of the computer device (140) and by means of a sensor system (150) of the screen printing machine (100) which is in communication with the computer device (140); i ), b) The deriving (221) comprises using a pattern recognition algorithm on a picture of the printed pattern taken by means of a camera (151) of the sensor system (150).

6. The method according to claim 1, It is characterized in that When the deviation (Δx) is positive, calculation (222) produces the same value as the scraper speed (v R ) Plate speed in the same direction (v P ).

7. A computer-controlled screen printing machine (100) for implementing the method according to claim 1, It is characterized in that a) at least one electric squeegee drive (130) for translating a squeegee (110) of the screen printer (100) relative to a screen (120) of the screen printer (100) at least along an X-axis (X) parallel to the screen (120), b) at least one electric plate drive (161) for translating a printing plate (160) of the screen printing machine (100) relative to the screen (120) at least along an X-axis (X), c) at least one computer device (140) in communication with said scraper driver (130) and said plate driver (161), and d) a sensor system (150), the sensor system (150) being in communication with the computer device (140) to automatically obtain (221) an actual size (x) of the printed pattern printed by the screen printer (100) along the X axis (X); i ), e) Among them, The scraper driver (130) and the plate driver (161) each include at least one servo motor that is communicatively connected to the computer device (140).

8. The screen printing machine (100) according to claim 7, It is characterized in that The at least one servo motor includes at least one absolute value sensor communicatively coupled to the computer device (140).

9. The screen printing machine (100) according to claim 7, It is characterized in that The sensor system (150) comprises a camera (151) for taking a picture of the printed pattern.

10. The screen printing machine (100) according to claim 7, It is characterized in that The printing plate (160) includes a vacuum fixing device (162) which is communicatively connected to the computer device (140) so as to suck the substrate to be printed by the screen printer (100) onto the printing plate (160).

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