Screen printing plate adhesion cleaning device of screen printing equipment

Abstract

The invention discloses a screen printing plate adhesion cleaning device of screen printing equipment, which is characterized in that a winding roller and an unwinding roller for cleaning an adhesive film tape are mounted on a moving seat, the screen printing plate adhesion cleaning device further comprises a supporting flat plate and a guide roller group which are horizontally mounted on the moving seat, and the shape and the size of the supporting flat plate correspond to those of a screen printing plate; the supporting flat plate, the winding roller and the unwinding roller are arranged in parallel; the guide roller set comprises a swing rubber roller close to one side of the supporting flat plate, and under the guidance of the guide roller set, the cleaning adhesive film belt led out of the unwinding roller bypasses the swing rubber roller from the lower portion of the supporting flat plate and then returns to the winding roller from the upper portion of the supporting flat plate. The unwinding roller and the winding roller are respectively connected with a driving motor, and the device has two working modes which are standby for each other. The sticky film cleaning belt abuts against all the bottom faces of the pasting templates to clean the whole bottom faces of the pasting templates; the provided abutting pressure is stable and reliable; an effective standby means is provided, and it can be ensured that cleaning work is completed with high quality and high efficiency.

Description

Technical Field

[0001] The invention relates to a device for automatically cleaning a screen of screen printing equipment. Background Art

[0002] Screen printing is silk screen printing, which refers to using a silk screen as a base and making a screen with images (screen printing plate) through a photosensitive platemaking method. Screen printing consists of five major elements: screen, printing knife (also called scraper or scraper), ink, printing table and substrate. Printing is based on the basic principle that the mesh holes of the image part of the screen can pass the ink, while the mesh holes of the non-image part cannot pass the ink. When printing, pour ink on one end of the screen, press the screen down with a printing knife and scrape it at a constant speed towards the other end of the screen. During the movement, the ink is squeezed from the mesh holes of the image part by the printing knife onto the substrate.

[0003] In the prior art, when the device loaded with the roll cleaning tape moves linearly into the screen printing equipment to automatically clean the screen, a working roll is directly pressed upward under the screen so that the cleaning tape on the roll fits the screen, and then as the device as a whole moves relative to the screen and the cleaning tape is reeled and unwound, the cleaning tape is continuously updated and the screen is cleaned. For example, the Chinese patent document "A component printer that automatically cleans the bottom of the screen" with application publication number CN 114603990 A published on June 10, 2022, completes the corresponding work by closely fitting the cleaning roll 101 to the printing screen.

[0004] The disadvantage of the existing technology is that the working reliability needs to be improved, which is mainly manifested in the following aspects:

[0005] First, only the cleaning belt part at the top of the working roll arc contacts and cleans the bottom of the screen, and the cleaning effect and reliability need to be improved;

[0006] As the reel is being wound and unwound, the cleaning tape on the working reel is constantly decreasing or increasing, the overall radius of the reel is shrinking / expanding, and the distance between the reel and the screen is constantly changing dynamically. It is difficult to accurately match the contact pressure between the working reel and the screen with this change, which may easily cause the working reel to freeze or the cleaning tape to separate from the screen, affecting the smooth cleaning work or the cleaning quality.

[0007] Moreover, it is difficult to accurately adjust the level of the working roll so that the cleaning belt and the screen are parallel to each other, and the adjustment mechanism is complicated.

[0008] Secondly, the working mode is single. When the working roll cleaning belt presses upward to fit the screen and fails to achieve the cleaning purpose, there is a lack of countermeasures and the only option is disassembly and maintenance. Summary of the invention

[0009] In order to solve the above-mentioned drawbacks, the technical problem to be solved by the present invention is a device for automatically cleaning the screen of a screen printing device, which effectively improves the reliability of its cleaning work. In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is a screen adhesion cleaning device for a screen printing device, comprising a movable seat installed on a linear guide rail, a winding roller and an unwinding roller for a cleaning adhesive film tape installed on the movable seat, characterized in that it also includes a supporting plate and a guide roller group horizontally installed on the movable seat, the shape and size of the supporting plate correspond to the screen setting, and the supporting plate is arranged in parallel with the winding roller and the unwinding roller; the guide roller group includes a swinging rubber roller close to one side of the supporting plate, and under the guidance of the guide roller group, the cleaning adhesive film tape led out by the unwinding roller passes by the swinging rubber roller from the bottom of the supporting plate and returns to the winding roller from the top of the supporting plate; the unwinding roller is connected to a first drive motor; the winding roller is connected to a second drive motor,

[0010] The device includes two working modes that are mutually standby: in mode one, the moving seat moves forward along the linear guide rail to enter under the screen of the screen printing equipment, the support plate corresponds to the position of the screen, and the swinging rubber roller swings upward to a position where the roller surface is higher than the upper surface of the support plate; the moving seat moves in the reverse direction at a slow speed along the linear guide rail, and during the reverse movement, the unwinding roller unwinds, and the swinging rubber roller abuts and sticks the cleaning adhesive film tape to the bottom of the screen during the movement; the moving seat stops after reaching the specified position, the unwinding roller stops working, the swinging rubber roller swings downward to reset, and the winding roller winds up, and the cleaning adhesive film tape stuck to the bottom of the screen is peeled off and rolled up, completing the cleaning work;

[0011] Mode 2: The movable seat moves forward along the linear guide rail to enter under the screen of the screen printing equipment. The support plate corresponds to the position of the screen. The printing knife of the screen printing equipment presses down the screen and moves at a constant speed to scrape the other end of the screen. During the movement, the printing knife cooperates with the support plate up and down to abut the bottom of the screen against the clean sticky film tape. The movable seat stops after reaching the specified position, the printing knife resets, and the winding roller and the unwinding roller work to peel off and retract the clean sticky film tape adhered to the bottom of the screen to complete the cleaning work.

[0012] The beneficial effects of the present invention are:

[0013] 1. The cleaning adhesive tape is pressed against the entire bottom surface of the pasted template to clean, and the cleaning effect is comprehensive and reliable.

[0014] 2. The working distance between the swinging rubber roller or printing knife / supporting plate and the cleaning adhesive tape and screen is constant, the parallel fitting state of the cleaning adhesive tape and screen is accurate and constant, the abutting pressure provided is stable and reliable, and the cleaning quality is guaranteed.

[0015] 3. Working mode 1 presses the cleaning adhesive tape from bottom to top to make it stick to the bottom surface of the screen for cleaning; working mode 2 presses the screen from top to bottom to make its bottom surface stick to the cleaning adhesive tape for cleaning; the two modes serve as backup for each other. When one mode cannot achieve the cleaning purpose, it provides an effective backup means to ensure high-quality and efficient completion of the cleaning work without delaying the printing work; at the same time, it is conducive to cleaning work in different working scenarios.

[0016] In one embodiment, the cleaning mucosa belt is provided with a tension detection component, and the signal of the tension detection component controls the action of the second drive motor; the tension detection component adopts a roller travel switch, and the roller of the roller travel switch abuts against the cleaning mucosa belt in a tensioned state, and when the cleaning mucosa belt is loose and out of contact with the roller, a signal is sent to cause the second drive motor to act and drive the winding roller to rewind. The purpose is to ensure that the cleaning mucosa belt is in a tensioned state during the entire cleaning process, so as to avoid malfunctions caused by loose cleaning mucosa belt or affect the cleaning effect.

[0017] In one embodiment, the torque is transmitted between the second drive motor and the winding drum through the electromagnetic clutch. When the cleaning mucosa tape is tightened, the rotational resistance of the winding drum increases. When the rotational resistance is greater than the set load of the electromagnetic clutch, the active part and the driven part of the electromagnetic clutch are disconnected from the magnetic connection under the action of the rotational resistance, so that the transmission connection between the winding drum and the second drive motor is disconnected. The working principle of the electromagnetic clutch is to use the magnetic field generated by the electromagnet to realize the transmission and disconnection of the power between the active part and the driven part. Avoid excessive winding and tearing of the cleaning mucosa tape.

[0018] In one embodiment, the rotating shaft of the swing rubber roller is installed at the upper end of the rotating frame below the supporting plate, the middle part of the rotating frame is hinged on the movable seat, and the lower end of the rotating frame is hinged to the swing cylinder; a guide roller B is arranged below the swing rubber roller, and a photoelectric sensor is arranged corresponding to the side of the cleaning mucous membrane belt between the swing rubber roller and the guide roller B; the photoelectric sensor is communicated and connected to the swing cylinder to control the swing of the rotating frame.

[0019] In one embodiment, a photoelectric switch for monitoring the thickness of the cleaning mucosa tape on the unwinding roller is provided on the side of the unwinding roller, so as to remind the user to replace the cleaning mucosa tape on the unwinding roller in time when the cleaning mucosa tape on the unwinding roller is used up.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time.

[0021] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the main structure of the screen adhesion cleaning device;

[0029] Figure 2 It is a schematic diagram of the top view of the structure of the screen adhesion cleaning device;

[0030] Figure 3 It is a right view structural schematic diagram of the screen adhesion cleaning device;

[0031] Figure 4 Schematic diagram of the three-dimensional structure of the screen adhesion cleaning device Figure 1 ;

[0032] Figure 5 Schematic diagram of the three-dimensional structure of the screen adhesion cleaning device Figure 2 ;

[0033] Figure 6 It is a schematic diagram of the partially enlarged structure of the swing rubber roller;

[0034] Figure 7 It is a schematic diagram of the exploded structure of the screen adhesion cleaning device;

[0035] Figure 8 This is a schematic diagram of the working principle of working mode 1;

[0036] Fig. 9 This is a schematic diagram of the working principle of working mode 2. DETAILED DESCRIPTION

[0037] Referring to the accompanying drawings, a specific structure of the present invention is reflected. The screen adhesion cleaning device of the screen printing equipment includes a moving seat 1 installed on a linear guide rail 101, and the linear guide rail 101 is installed on a base 102. The moving seat 1 is composed of a first wall plate 104 and a second wall plate 105 fixed on both sides of a bottom plate 103. The moving motor 106 drives the moving seat 1 to reciprocate along the linear guide rail 101 through a synchronous belt wheel transmission assembly 107 and a screw transmission assembly 108.

[0038] The first wall plate 104 of the movable seat 1 is provided with a reel 201 and an unreel 202 of the cleaning adhesive film tape 2. A support plate 3 is fixedly installed horizontally on the upper ends of the first wall plate 104 and the second wall plate 105 of the movable seat 1. The shape and size of the support plate 3 correspond to the screen 5 of the screen printing device. The support plate 3 is arranged in parallel with the reel 201 and the unreel 202. In the example, the unreel 202 is located between the support plate 3 and the reel 201.

[0039] The movable seat is also provided with a guide roller group for the cleaning mucosa tape 2. In the example, the guide roller group includes a swinging rubber roller 401, a guide roller A402, a guide roller B403, a guide roller C404, a guide roller D410, and a guide roller E411 close to the side of the supporting plate 3. Under the guidance of the guide roller group, the cleaning mucosa tape 2 drawn out by the unwinding roller 202 passes through the swinging rubber roller 401 from the bottom of the supporting plate 3 and then returns to the winding roller 201 from the top of the supporting plate 3; the unwinding roller 202 is connected to the first drive motor 203; and the winding roller 201 is connected to the second drive motor 204. In the example, photoelectric switches 205 for monitoring the thickness of the cleaning mucosa tape 2 wound on the unwinding roller 202 are provided on both sides of the unwinding roller 202. When the cleaning mucosa tape 2 on the unwinding roller 202 is used up, a signal is sent to remind timely replacement.

[0040] The device includes two working modes that are mutually redundant:

[0041] Mode 1: the moving motor 106 works, the moving seat 1 moves forward along the linear guide rail 101 into the screen printing device and moves to below the screen 5. The position is limited by the position-adjustable limiter 109 so that the support plate 3 and the screen 5 are exactly in correspondence.

[0042] The swinging rubber roller 401 swings upward to a position where the roller surface is higher than the upper surface of the supporting plate 3; in the example, the rotating shaft of the swinging rubber roller 401 is installed at the upper end of the rotating frame 406 below the supporting plate 3, the middle part 407 of the rotating frame 406 is hinged on the first wall panel 104 of the movable seat 1, and the lower end of the rotating frame 406 is hinged to the swing cylinder 408; a guide roller B403 is arranged below the swinging rubber roller 401, and a photoelectric sensor 409 is correspondingly arranged on the side of the cleaning adhesive film belt 2 between the swinging rubber roller 401 and the guide roller B403; the photoelectric sensor 409 communicates with the swing cylinder 408 to control the swing of the rotating frame 406, so that the swinging rubber roller 401 is in an appropriate position, thereby ensuring the fit between the cleaning adhesive film belt 2 and the bottom surface of the screen 5.

[0043] The movable seat 1 moves in reverse at a slow speed along the linear guide rail 101, and the unwinding roller 202 unwinds the cleaning adhesive film tape 2 during the reverse movement; during the reverse movement, the swinging rubber roller 401 abuts and sticks the cleaning adhesive film tape 2 to the bottom of the screen 5; the cleaning adhesive film tape 2 covers the entire bottom surface of the template 5; and the parallel fitting state and working distance between the swinging rubber roller 401, the cleaning adhesive film tape 2 and the screen 5 are always kept constant and will not change, and the abutting pressure is stable and reliable.

[0044] The movable seat 1 stops after reaching the designated position, the unwinding roller 202 stops unwinding, the swinging rubber roller 401 swings downward to reset, and the winding roller 201 winds up, and the cleaning adhesive film tape 2 pasted on the bottom of the screen 5 is peeled off and rolled up, thus completing a cleaning operation.

[0045] Mode 2: the moving motor 106 works, the moving seat 1 moves forward along the linear guide rail 101 into the screen printing device and moves to below the screen 5. The position is limited by the position-adjustable limiter 109 so that the support plate 3 and the screen 5 are exactly in correspondence.

[0046] The printing knife 6 of the screen printing device presses down the screen 5 and moves toward the other end of the screen 5 at a uniform speed to scrape it. This action of the printing knife 6 is the same as that in screen printing, and no additional working mechanism is needed.

[0047] During the movement, the printing knife 6 cooperates with the supporting plate 3 to clamp the screen 5 and the cleaning mucus film tape 2 up and down, and the bottom of the screen 5 is abutted and adhered to the cleaning mucus film tape 2; the cleaning mucus film tape 2 also covers the entire bottom surface of the template 5; and the parallel fitting state and working distance between the printing knife / supporting plate and the cleaning mucus film tape 2 and the screen 5 are always kept constant and will not change, and the abutting pressure is stable and reliable.

[0048] The printing knife 6 is reset, the winding roller 201 and the unwinding roller 202 work to peel off and retract the cleaning adhesive tape 2 pasted on the bottom of the screen 5, and the movable seat 1 is reset to complete the cleaning work once.

[0049] The above-mentioned working mode 1 presses the cleaning adhesive tape 2 from bottom to top so that it sticks to the bottom surface of the screen 5 for cleaning; the working mode 2 presses the screen 5 from top to bottom so that its bottom surface sticks to the cleaning adhesive tape 2 for cleaning; the two modes are backup for each other. When the cleaning effect of a certain mode is not ideal, the other mode can be used for cleaning, ensuring that the cleaning work can be completed with high quality and efficiency, and disassembly and maintenance are not required to delay the printing work; at the same time, it is conducive to cleaning work in different working scenarios.

[0050] In the example, the cleaning mucosa belt 2 is provided with a tension detection component, and the tension detection component adopts a roller travel switch, and the roller 405 of the roller travel switch abuts against the cleaning mucosa belt 2 in a tensioned state. When the cleaning mucosa belt 2 is loose and out of contact with the roller 405, the roller travel switch sends a signal to make the second drive motor 203 operate to drive the winding roller 202 to rewind. The purpose is to ensure that the cleaning mucosa belt 2 is in a tensioned state throughout the cleaning process, to avoid the cleaning mucosa belt 2 being loose and causing malfunctions or affecting the cleaning effect, such as wrinkles on the cleaning mucosa belt 2 affecting the fit with the bottom surface of the screen 5, resulting in inadequate local cleaning.

[0051] In the example, torque is transmitted between the second drive motor 203 and the winding drum 202 through the electromagnetic clutch 206. When the cleaning mucosal tape 2 is tensioned, the rotational resistance of the winding drum 202 increases. When this rotational resistance is greater than the set load of the electromagnetic clutch 206, the active part and the driven part of the electromagnetic clutch 206 are disconnected from the magnetic connection under the action of this rotational resistance, so that the transmission connection between the winding drum 202 and the second drive motor 203 is disconnected.

[0052] The working principle of the electromagnetic clutch is to use the magnetic field generated by the electromagnet to achieve the transmission and disconnection of power between the active part and the driven part. In the prior art, the action of the electromagnetic clutch is controlled by the on and off of the magnetic field power supply. When the coil of the electromagnetic clutch is powered off, the magnetic field disappears, and the magnetic material is separated from the electromagnetic suction cup under the action of the spring, so that the magnetic force between the active part and the driven part disappears, and the power is cut off.

[0053] The technical solution of the present invention is characterized in that the action of the electromagnetic clutch 206 is not controlled by the magnetic field power supply, but the rotational resistance forces the magnetic connection between the active part and the driven part to be broken. The electromagnetic clutch 206 in the present invention plays a role similar to a fuse, preventing the winding roller 202 from over-winding and tearing the cleaning mucosa tape 2. The magnetic field strength can be changed by adjusting the coil current of the electromagnetic clutch 206, thereby setting the magnetic connection strength between the active part and the driven part, and realizing the adjustment setting of the set load of the electromagnetic clutch 206.

[0054] 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 implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and describes these embodiments in detail in conjunction with the accompanying drawings in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating 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 specific embodiments disclosed.

Claims

1. A screen adhesion cleaning device for screen printing equipment, comprising a moving seat mounted on a linear guide rail, a winding roller and an unwinding roller for cleaning adhesive film tape mounted on the moving seat, characterized in that: The mobile seat also includes a support plate and a guide roller group horizontally mounted on the movable seat. The shape and size of the support plate correspond to the screen setting. The support plate is arranged in parallel with the winding drum and the unwinding drum. The guide roller group includes an oscillating rubber roller close to one side of the support plate. Under the guidance of the guide roller group, the clean adhesive film tape drawn out by the unwinding drum passes through the oscillating rubber roller from the bottom of the support plate and then returns to the winding drum from the top of the support plate. The unwinding drum is connected to a first drive motor. The winding drum is connected to a second drive motor. The device includes two working modes that are mutually standby: in mode one, the moving seat moves forward along the linear guide rail to enter under the screen of the screen printing equipment, the support plate corresponds to the position of the screen, and the swinging rubber roller swings upward to a position where the roller surface is higher than the upper surface of the support plate; the moving seat moves in the reverse direction at a slow speed along the linear guide rail, and during the reverse movement, the unwinding roller unwinds, and the swinging rubber roller abuts and sticks the cleaning adhesive film tape to the bottom of the screen during the movement; the moving seat stops after reaching the specified position, the unwinding roller stops working, the swinging rubber roller swings downward to reset, and the winding roller winds up, and the cleaning adhesive film tape stuck to the bottom of the screen is peeled off and rolled up, completing the cleaning work; Mode 2: The movable seat moves forward along the linear guide rail to enter under the screen of the screen printing equipment. The support plate corresponds to the position of the screen. The printing knife of the screen printing equipment presses down the screen and moves at a constant speed to scrape the other end of the screen. During the movement, the printing knife cooperates with the support plate up and down to abut the bottom of the screen against the clean sticky film tape. The movable seat stops after reaching the specified position, the printing knife resets, and the winding roller and the unwinding roller work to peel off and retract the clean sticky film tape adhered to the bottom of the screen to complete the cleaning work.

2. A screen adhesion cleaning device for screen printing equipment according to claim 1, characterized in that: The torque is transmitted between the second drive motor and the winding drum through the electromagnetic clutch. When the cleaning mucous membrane belt is tensioned, the rotational resistance of the winding drum increases. When the rotational resistance is greater than the set load of the electromagnetic clutch, the active part and the driven part of the electromagnetic clutch are disconnected from the magnetic connection under the action of the rotational resistance, so that the transmission connection between the winding drum and the second drive motor is disconnected.

3. A screen adhesion cleaning device for screen printing equipment according to claim 1 or 2, characterized in that: The cleaning mucosa belt is provided with a roller travel switch, the roller of the roller travel switch abuts against the cleaning mucosa belt in a tensioned state, and when the cleaning mucosa belt loosens and loses contact with the roller, a signal is sent to activate the second drive motor to drive the winding roller to rewind.

4. A screen adhesion cleaning device for screen printing equipment according to claim 1 or 2, characterized in that: The rotating shaft of the swing rubber roller is installed at the upper end of the rotating frame below the supporting plate, the middle part of the rotating frame is hinged on the moving seat, and the lower end of the rotating frame is hinged to the swing cylinder; a guide roller B is arranged below the swing rubber roller, and a photoelectric sensor is correspondingly arranged on the side of the clean mucous membrane belt between the swing rubber roller and the guide roller B; the photoelectric sensor is communicated and connected to the swing cylinder to control the swing of the rotating frame.

5. A screen adhesion cleaning device for screen printing equipment according to claim 1 or 2, characterized in that: A photoelectric switch for monitoring the thickness of the clean mucous membrane tape on the unwinding roller is arranged on the side of the unwinding roller.

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