Parallel calibration device and method for screen printing scraper and printing plane

Abstract

The invention discloses a parallelism calibration device and method for a screen printing scraper and a printing plane. The two ends of the scraper are provided with micrometer heads for adjusting the balance of the two ends of the scraper respectively. The calibration strips arranged on one side of the printing platform in parallel correspond to the scraper above the calibration strips. The lower part of the calibration strip is centrally supported on a rotating fulcrum, two pressure sensors are symmetrically distributed on two sides of the rotating fulcrum and are correspondingly arranged below two ends of the calibration strip, and the pressure sensors are in signal connection with a display screen; the rotating fulcrum and the pressure sensor are installed on the bottom plate through the lifting base and the lifting driving piece, and the bottom plate is provided with a horizontal adjusting assembly. The parallelism of the scraper and the printing plane is not repeatedly debugged by a manual visual inspection mode; accurate quantitative adjustment can be directly carried out according to the pressure value displayed by the display screen, the parallelism of the scraper and the printing plane can be rapidly calibrated at a time, the calibration work is accurate and reliable, the calibration result is stable, the calibration operation difficulty is effectively reduced, and the calibration work efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of screen printing, and in particular to a device for calibrating the parallelism between the squeegee of a screen printing machine and the printing plane. Background Art

[0002] Before the screen printing equipment works, the parallelism between the squeegee of the screen printing machine and the printing plane should be calibrated and adjusted. Since the effective working area of the obliquely arranged squeegee (generally, the oblique angle is in the conventional range of 65-85 degrees) is actually only 2-3 mm at the blade edge ， The accuracy of the adjustment is directly related to the printing accuracy or printing quality of the printed matter. In the prior art, the calibration of the parallelism between the squeegee of the screen printing equipment and the printing plane is carried out by manual visual inspection and repeated debugging. Such a method has high technical requirements for the operator's experience and great operation difficulty; it needs to be completed through a repeated calibration and testing debugging process, with a high workload, and the calibration result has instability, affecting the work efficiency. Summary of the Invention

[0003] In order to solve the above drawbacks, the technical problem to be solved by the present invention is to provide a device for calibrating the parallelism between the squeegee of a screen printing machine and the printing plane, which effectively reduces the calibration operation difficulty and effectively improves the calibration work efficiency. To solve the above technical problem, the technical solution adopted by the present invention is a parallel calibration device for a screen printing squeegee and a printing plane, including a squeegee and a printing platform, characterized in that differential heads for adjusting the balance at both ends of the squeegee are respectively provided at both ends of the squeegee; calibration strips are arranged in parallel on one side of the printing platform, and the calibration strips are arranged corresponding to the squeegee above; the lower part of the calibration strip is centered and supported on a rotating fulcrum, and two pressure sensors are symmetrically distributed on both sides of the rotating fulcrum, and the sensors of the pressure sensors are arranged corresponding to the lower parts of both ends of the calibration strip, and the pressure sensors are signal-connected to a display screen; the rotating fulcrum and the pressure sensors are installed on a lifting base, the lifting base is installed on a lifting driving member, the lifting driving member is installed on a bottom plate, and the bottom plate is provided with a horizontal adjustment assembly.

[0004] In one embodiment, the rotating fulcrum includes an upper connecting member fixed to the lower part of the calibration strip and a lower connecting member fixed to the lifting base, a bearing is installed on the support shaft of the lower connecting member, and a waist-shaped hole is provided on the upper connecting member, and the waist-shaped hole is sleeved on the outer ring of the bearing.

[0005] In one embodiment, two guiding blocks are also symmetrically distributed on both sides of the rotating fulcrum, the upper ends of the guiding blocks are connected to the lower part of the calibration strip; guiding grooves are installed on the lifting base corresponding to the guiding blocks, and the lower parts of the guiding blocks are inserted into the guiding grooves, and the guiding blocks and the guiding grooves are located between the rotating fulcrum and the pressure sensors.

[0006] In one embodiment, the horizontal adjustment assembly is four horizontal adjustment bolts respectively arranged at the four corners of the bottom plate.

[0007] In one embodiment, the lifting driving member is a cylinder, the cylinder is installed on the bottom plate, and the working end of the cylinder acts on the lifting base.

[0008] The present invention also provides a method for parallel calibration of a screen printing squeegee and a printing plane, including the following steps:

[0009] S1: Taking the upper surface of the printing platform as the reference horizontal plane, measuring the first parallelism between the upper surface of the printing platform and the upper surface of the calibration bar. When the first parallelism does not meet the standard, adjusting the levelness of the calibration bar through the horizontal adjustment component until the first parallelism reaches the qualified measurement value, and then zeroing the display values of the two pressure sensors on the display screen;

[0010] S2: Raising the calibration bar through the lifting driving member until the upper surface of the calibration bar is higher than the upper surface of the printing platform;

[0011] S3: Lowering the squeegee to abut against the upper surface of the calibration bar, the pressure sensors are pressed and display the pressure values on the display screen. Adjusting the balance adjustment differential heads at both ends of the squeegee according to the pressure difference shown by the two pressure values until the pressure values displayed by the two pressure sensors are equal, which means that the second parallelism between the squeegee and the printing plane meets the requirements;

[0012] S4: The squeegee resets to enter the standby state, and the lifting driving member drives the calibration bar to descend until the upper surface of the calibration bar is lower than the upper surface of the printing platform.

[0013] The beneficial effects of the present invention are as follows: It no longer relies on manual visual inspection to repeatedly debug the parallelism between the squeegee and the printing plane; it can directly perform accurate quantitative adjustment according to the pressure values displayed on the display screen, quickly calibrate the parallelism between the squeegee and the printing plane at one time, the calibration work is accurate and reliable, the calibration result is stable, effectively reducing the calibration operation difficulty and greatly improving the calibration work efficiency.

[0014] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages.

[0015] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0016] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0017] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0018] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0020] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation. Description of the Drawings

[0021] Figure 1 is a three-dimensional view of the overall structure of the parallel calibration device;

[0022] Figure 2 is a side view of the overall structure of the parallel calibration device;

[0023] Figure 3 is a schematic diagram of the combined structure of the calibration bar and the printing platform;

[0024] Figure 4 is a schematic diagram of the assembled structure of the calibration bar;

[0025] Figure 5 is an exploded view of the calibration bar.

[0026] Explanation of the reference numerals in the drawings: 1 printing platform, 2 calibration bar, 3 pressure sensor, 301 sensor, 4 upper connecting member, 401 waist-shaped hole, 5 lower connecting member, 501 mounting shaft, 6 bearing, 7 guide block, 8 guide groove, 9 lifting base, 10 bottom plate, 11 squeegee, 12 micrometer head, 13 horizontal adjustment bolt, 14 lifting cylinder. Detailed Embodiment

[0027] Refer to the attached Figures 1-5 , which reflects a specific structure of the present invention. The parallel calibration device for the screen printing squeegee and the printing plane includes a squeegee 11 and a printing platform 1. Micrometer heads 12 for adjusting the balance at both ends of the squeegee are respectively provided at both ends of the squeegee 11. A calibration bar 2 is arranged in parallel on one side of the printing platform 1, and the calibration bar 2 is arranged corresponding to the upper squeegee 11 up and down.

[0028] The lower surface of the calibration bar 2 is centrally supported on a rotation fulcrum. Taking the rotation fulcrum (specifically the support shaft 501) as the axis of symmetry, two pressure sensors 3 are symmetrically distributed on both sides of the rotation fulcrum left and right. The sensors 301 of the pressure sensors 3 are arranged corresponding to the lower surfaces of both ends of the calibration bar 2. The sensor 301 (also called a sensitive element) refers to the component of the pressure sensor that is in direct contact with the measured object (calibration bar 2). This component is an element that directly senses the measured object and outputs other quantities having a definite relationship with the measured object. The pressure sensors 3 are signal-connected to a display screen (not shown in the figure), and the pressure values measured by the pressure sensors 3 are displayed on the display screen.

[0029] The rotation fulcrum and the pressure sensor 3 are installed on the lifting base 9, the lifting base 9 is installed on the lifting driving member, the lifting driving member is installed on the bottom plate 10, and the bottom plate 10 is provided with a horizontal adjustment assembly.

[0030] In the example, the rotation fulcrum includes an upper connecting member 4 fixedly connected under the calibration bar 2 and a lower connecting member 5 fixedly connected to the lifting base 9. A bearing 6 is installed on the support shaft 501 of the lower connecting member 5. A waist-shaped hole 401 is provided on the upper connecting member 4, and the waist-shaped hole 401 is sleeved on the outer ring of the bearing 6 to ensure the rotational flexibility of the calibration bar 2.

[0031] In the example, two guide blocks 7 are symmetrically distributed on both sides of the rotation fulcrum. The upper ends of the guide blocks 7 are connected to the lower surface of the calibration bar 2; corresponding to the guide blocks 7 on the lifting base 9, guide grooves 8 are installed. The lower parts of the guide blocks 7 are inserted into the guide grooves 8, and the guide blocks 7 and the guide grooves 8 are located between the rotation fulcrum and the pressure sensor 3. The width of the guide block 7 is smaller than the groove width of the guide groove 8 to avoid interfering with the left and right swing of the guide block 7, so as to flexibly and effectively limit and guide the calibration bar 2 to prevent its front and back swing.

[0032] In the example, the horizontal adjustment assembly is four horizontal adjustment bolts 13 respectively arranged at the four corners of the bottom plate 10.

[0033] In the example, the lifting driving member is two lifting cylinders 14. The cylinder bodies of the lifting cylinders 14 are installed on the bottom plate 10, and the driving working ends (such as the end of the piston rod) of the lifting cylinders 14 that connect and drive the movement of the working object act on the lifting base 9.

[0034] The method for parallel calibration of the squeegee and the printing plane of a planar printing device by using the above device includes the following steps:

[0035] S1: Taking the upper surface of the printing platform 1 (i.e., the printing plane) as the reference horizontal plane, measure the first parallelism between the upper surface of the printing platform 1 and the upper surface of the calibration bar 2. When measuring, the levelness of the calibration bar 2 can be adjusted by the four horizontal adjustment bolts 13 until the first parallelism reaches the qualified measurement value, and then zero the display values of the two pressure sensors 3. Generally, this step belongs to the calibration setting work during the equipment factory production, and it is not necessary to perform this step during daily printing, and only regular maintenance is required.

[0036] S2: Raise the calibration bar 2 through the two lifting cylinders 14 ， until the upper surface of the calibration bar 2 is higher than the upper surface of the printing platform 1;

[0037] S3: The squeegee 11 descends to abut against the upper surface of the calibration bar 2. The two pressure sensors 3 are pressed and display the pressure values on the display screen. Manually adjust the micrometer heads 12 at both ends of the squeegee 11 according to the difference between the two pressure values for balance adjustment until the pressure values displayed by the two pressure sensors 3 are equal, indicating that the second parallelism between the cutting edge of the squeegee 11 and the printing plane meets the requirements.

[0038] S4: After the above adjustment is completed, the squeegee resets to enter the standby state for printing preparation. The two cylinders drive the calibration bar 2 to descend until the upper surface of the calibration bar 2 is lower than the upper surface of the printing platform 1 to avoid interfering with the movement of the squeegee.

[0039] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and describes these embodiments in combination with the drawings to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is only limited by the claims and their full scope and equivalents, and is not limited by the disclosed specific embodiments.

Claims

1. A parallel calibration device for a screen printing squeegee and a printing plane, comprising a squeegee and a printing platform, characterized in that, Differential heads for adjusting the balance at both ends of the scraping knife are respectively provided at both ends of the scraping knife; calibration bars are arranged in parallel on one side of the printing platform, and the calibration bars are arranged corresponding to the scraping knife above; the lower part of the calibration bar is centered and supported on a rotating fulcrum, two pressure sensors are symmetrically distributed on both sides of the rotating fulcrum, the sensors of the pressure sensors are arranged corresponding to the lower ends of both ends of the calibration bar, and the pressure sensors are signal-connected to a display screen; the rotating fulcrum and the pressure sensors are installed on a lifting base, the lifting base is installed on a lifting driving member, the lifting driving member is installed on a bottom plate, and a horizontal adjusting assembly is provided on the bottom plate.

2. The parallel calibration device for a screen printing squeegee and a printing plane according to claim 1, characterized in that, The rotating fulcrum includes an upper connecting member fixedly connected to the lower surface of the calibration bar and a lower connecting member fixedly connected to the lifting base. A bearing is installed on the support shaft of the lower connecting member, and a waist-shaped hole is provided on the upper connecting member, and the waist-shaped hole is sleeved on the outer ring of the bearing.

3. The parallel calibration device for a screen printing squeegee and a printing plane according to claim 1, wherein Two guiding blocks are also symmetrically distributed on both sides of the rotating fulcrum, and the upper ends of the guiding blocks are connected to the lower surface of the calibration bar; guiding grooves are installed on the lifting base corresponding to the guiding blocks, and the lower parts of the guiding blocks are inserted into the guiding grooves, and the guiding blocks and the guiding grooves are located between the rotating fulcrum and the pressure sensors.

4. A parallel calibration device for a screen printing squeegee and a printing plane according to claim 1, characterized in that, The horizontal adjusting assembly is four horizontal adjusting bolts respectively arranged at the four corners of the bottom plate.

5. The parallel calibration device for a screen printing squeegee and a printing plane according to claim 1, characterized in that The lifting driving member is a cylinder, the cylinder is installed on the bottom plate, and the working end of the cylinder acts on the lifting base.

6. A method for parallel calibration of a screen printing scraping knife and a printing plane, comprising the following steps: S1: Taking the upper surface of the printing platform as the reference horizontal plane, measuring the first parallelism between the upper surface of the printing platform and the upper surface of the calibration bar. When the first parallelism does not meet the standard, adjusting the levelness of the calibration bar through the horizontal adjusting assembly until the first parallelism reaches the measured qualified value, and then zeroing the display values of the two pressure sensors on the display screen; S2: Raising the calibration bar through the lifting driving member until the upper surface of the calibration bar is higher than the upper surface of the printing platform; S3: Lowering the scraping knife to abut against the upper surface of the calibration bar, the pressure sensors are pressed and display the pressure values on the display screen. Adjusting the balance adjusting differential heads at both ends of the scraping knife according to the pressure difference shown by the two pressure values until the pressure values displayed by the two pressure sensors are equal, which means that the second parallelism between the scraping knife and the printing plane meets the requirements; S4: The scraping knife resets to enter the standby state, and the lifting driving member drives the calibration bar to descend until the upper surface of the calibration bar is lower than the upper surface of the printing platform.

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