阅读说明：本技术 椭圆印花机网版对准方法、网版对准系统及椭圆印花机 (Elliptical printing machine screen alignment method, screen alignment system and elliptical printing machine ) 是由 郭辉芸 于 2020-12-20 设计创作，主要内容包括：本发明提出了一种椭圆印花机网版对准方法及对准系统,该对准系统设置在椭圆印花机上,其包括网版、视觉组件、微型工控机、显示器、位置调整组件、台板以及横梁；本方案中的对准系统采用模块化设计,结构紧凑,节省空间,体积小,可直接在原椭圆机基础上进行安装；由于网版套位对准系统是和其它台板一起运行,故每一台椭圆印花机只需配一套网版套位对准系统(网版除外),大大减低了整台设备的制造成本；设备数据参数完全量化,普通员工经过简单培训的即可胜任操作,降低了操作人员的要求。(The invention provides an elliptical printing machine screen printing plate alignment method and an alignment system, wherein the alignment system is arranged on an elliptical printing machine and comprises a screen printing plate, a visual component, a miniature industrial personal computer, a display, a position adjusting component, a bedplate and a beam; the alignment system in the scheme adopts a modular design, has a compact structure, saves space and has a small volume, and can be directly installed on the basis of the original elliptical machine; because the screen plate sleeve position alignment system operates together with other table plates, each elliptical printing machine only needs to be matched with a set of screen plate sleeve position alignment system (except for a screen plate), and the manufacturing cost of the whole equipment is greatly reduced; the data parameters of the equipment are completely quantized, common staff can be competent to operate through simple training, and the requirements of operators are reduced.)

1. The method for aligning the screen of the elliptical printing machine is characterized by comprising the following steps of:

s1, starting the system and positioning the alignment system;

s2, roughly adjusting the screen plate to enable the mark points on the screen plate to enter the visual field range of the alignment system;

s3, measuring coordinate values of the mark points in real time, and calculating and measuring coordinate difference values and angle difference values between the coordinate values of the mark points and preset coordinates in real time;

s4, adjusting the position of the screen printing plate according to the calculated coordinate difference value and the calculated angle difference value to enable the mark point to approach the preset coordinate;

and S5, repeating the steps S3 and S4 until the coordinate difference value and the angle difference value between the coordinate value of the marking point and the preset coordinate value are within the preset difference value range.

2. The screen alignment method for elliptical printing machine as claimed in claim 1, further comprising between the steps S3 and S4: the coordinate difference value and the angle difference value in step S3 are displayed in real time.

3. The elliptical screen alignment method of claim 1, wherein the adjusting of the screen position in step S4 is performed by a driving unit.

4. The method for aligning the screen of the elliptical printing machine as claimed in claim 3, wherein the coordinate difference and the angle difference in step S3 are wirelessly transmitted to a PLC control unit, and the PLC control unit controls a servo motor to drive the screen for position adjustment.

5. The method for aligning the screen of an elliptical printing machine as claimed in claim 1, wherein the mark points on the screen are made by digital plate making in step S2.

6. A screen alignment system disposed on an elliptical printing machine, the alignment system comprising:

the screen printing plate is provided with at least two marking points and is movably arranged below a printing head of the elliptical printing machine;

the visual components are fixed on a bedplate of the elliptical printing machine below the screen printing plate, each visual component comprises a corner coaxial light source, a lens and a camera, light energy emitted by the corner coaxial light source penetrates through a positioning hole in the bedplate to irradiate the screen printing plate, light reflected by the screen printing plate reaches the camera after passing through the corner coaxial light source and the lens, and the camera is used for shooting the screen printing plate;

the miniature industrial personal computer is fixed on the bedplate, is electrically connected with the visual component and is used for receiving the image shot by the camera and determining the position relationship between the mark point on the screen printing plate and the positioning hole on the bedplate according to the image, and when the screen printing plate moves to a desired position, the miniature industrial personal computer outputs prompt information;

the display is in communication connection with the miniature industrial personal computer and is used for displaying deviation information between the screen printing plate marking point and a system setting range;

and the position adjusting assembly is connected with the screen printing plate and is used for adjusting the position of the screen printing plate.

7. The screen alignment system of claim 6, wherein a thermal insulation layer is further disposed between the platen and the vision assembly and the micro industrial personal computer.

8. The screen alignment system of claim 6, further comprising a detachable rechargeable battery pack electrically connected to the vision assembly and the micro industrial personal computer.

9. The screen alignment system of claim 6, wherein the number of screens is plural, the plural screens have different print patterns, and the marker points on the different screens are located at the same position.

10. The elliptical printing machine comprises a printing head and a bedplate, and is characterized in that: still include the half tone alignment system, half tone alignment system includes:

the printing head is movably arranged below the printing head;

the number and the positions of the visual assemblies correspond to the marking points on the screen printing plate respectively, the visual assemblies are fixed on the bedplate below the screen printing plate and comprise corner coaxial light sources, lenses and cameras, light energy emitted by the corner coaxial light sources penetrates through positioning holes in the bedplate to irradiate the screen printing plate, light reflected by the screen printing plate reaches the cameras after passing through the corner coaxial light sources and the lenses, and the cameras are used for shooting the screen printing plate;

the miniature industrial personal computer is fixed on the bedplate, is electrically connected with the visual component and is used for receiving the image shot by the camera and determining the position relationship between the mark point on the screen printing plate and the positioning hole on the bedplate according to the image, and when the screen printing plate moves to a desired position, the miniature industrial personal computer outputs prompt information;

the display is in communication connection with the miniature industrial personal computer and is used for displaying deviation information between the screen printing plate marking point and a system setting range;

and the position adjusting assembly is connected with the screen printing plate and is used for adjusting the position of the screen printing plate.

Technical Field

The invention relates to the technical field of screen printing, in particular to a screen printing plate alignment method and system of an elliptical printing machine and the elliptical printing machine.

Background

At present, the alignment of the printing screen sleeves of a plurality of elliptical printing machines is completely realized by the sense of operators and the personal skills. Because the elliptical machine has a large number of screen printing plates and high precision required by the sleeve position. The screen plate nesting position is adjusted manually, so that the accuracy is low, the deviation is large, the consumed time is long, data parameters cannot be quantized, the printing quality and the production efficiency are seriously influenced, and the requirement of frequent pattern transferring is more difficult to adapt. In view of this, how to improve the precision and the production efficiency of the screen positioning alignment of the elliptical printing machine is a problem to be solved urgently in the industry.

Disclosure of Invention

The invention aims to provide a screen alignment method and an alignment system of an elliptical printing machine, which can realize effective alignment of screen nesting and improve the quality and production efficiency of printed products.

The invention provides an alignment method of a screen printing plate of an elliptical printing machine, which comprises the following steps:

s1, starting the system and positioning the alignment system;

s2, roughly adjusting the screen plate to enable the mark points on the screen plate to enter the visual field range of the alignment system;

s3, measuring coordinate values of the mark points in real time, and calculating and measuring coordinate difference values and angle difference values between the coordinate values of the mark points and a preset coordinate in real time;

s4, adjusting the position of the screen printing plate according to the calculated coordinate difference value and the calculated angle difference value to enable the mark point to approach the preset coordinate;

and S5, repeating the steps S3 and S4 until the coordinate difference value and the angle difference value between the coordinate value of the marking point and the preset coordinate value are within the preset difference value range.

As a further improvement of the present invention, between the above steps S3 and S4, the method further comprises: the coordinate difference value and the angle difference value in step S3 are displayed in real time.

As a further improvement of the present invention, the adjusting of the screen position in step S4 is performed by a driving unit.

As a further improvement of the present invention, the coordinate difference and the angle difference in step S3 are wirelessly transmitted to a PLC control unit, and the PLC control unit controls a servo motor to drive the screen to perform position adjustment.

As a further improvement of the present invention, in step S2, the mark points on the screen are made by digital plate making.

The invention also provides a screen alignment system, which is arranged on the elliptical printing machine, and comprises: the screen printing plate is provided with at least two marking points and is movably arranged below a printing head of the elliptical printing machine; the visual components are fixed on a bedplate of the elliptical printing machine below the screen plate and comprise corner coaxial light sources, lenses and cameras, light emitted by the corner coaxial light sources penetrates through positioning holes in the bedplate to irradiate the screen plate, light reflected by the screen plate reaches the cameras after passing through the corner coaxial light sources and the lenses, and the cameras are used for shooting the screen plate; the miniature industrial personal computer is fixed on the bedplate, is electrically connected with the visual component and is used for receiving the image shot by the camera and determining the position relationship between the mark point on the screen printing plate and the positioning hole on the bedplate according to the image, and outputs prompt information when the screen printing plate moves to an expected position; the display is in communication connection with the miniature industrial personal computer and is used for displaying deviation information between the screen printing plate marking point and a system setting range; and the position adjusting assembly is connected with the screen printing plate and is used for adjusting the position of the screen printing plate.

As a further improvement of the invention, a heat insulation layer is arranged between the bedplate and the vision assembly and between the bedplate and the miniature industrial personal computer.

As a further improvement of the invention, the mobile phone also comprises a detachable rechargeable battery pack which is electrically connected with the vision assembly and the miniature industrial personal computer.

As a further improvement of the present invention, the number of the screen printing plates is multiple, the multiple screen printing plates have different printing patterns, and the mark points located on the different screen printing plates are located at the same position.

The invention also provides an elliptical printing machine, which comprises a printing head, a bedplate and a screen alignment system, wherein the screen alignment system comprises: the printing head is movably arranged below the printing head; the number and the positions of the visual assemblies correspond to the marking points on the screen printing plate respectively, the visual assemblies are fixed on the bedplate below the screen printing plate and comprise corner coaxial light sources, lenses and cameras, light emitted by the corner coaxial light sources penetrates through positioning holes in the bedplate to irradiate the screen printing plate, light reflected by the screen printing plate reaches the cameras after passing through the corner coaxial light sources and the lenses, and the cameras are used for shooting the screen printing plate; the miniature industrial personal computer is fixed on the bedplate, is electrically connected with the visual component and is used for receiving the image shot by the camera and determining the position relation between the mark points on the screen printing plate and the positioning holes on the bedplate according to the image, and when the screen printing plate moves to an expected position, the miniature industrial personal computer outputs prompt information; the display is in communication connection with the miniature industrial personal computer and is used for displaying deviation information between the screen printing plate marking point and a system setting range; and the position adjusting assembly is connected with the screen printing plate and is used for adjusting the position of the screen printing plate.

The invention has the following beneficial effects:

1. the screen plate sleeve position aligning system adopts a modular design, has compact structure, saves space and small volume, and can be directly and quickly installed on the basis of the original elliptical machine;

2. because the screen plate sleeve position alignment system operates together with other table plates, each elliptical printing machine only needs to be provided with a set of screen plate sleeve position alignment system (except for a screen plate), and the manufacturing cost of the whole equipment is greatly reduced;

3. the data parameters of the equipment are completely quantized, and common staff can be competent to operate through simple training, so that the requirements of operators are reduced;

4. because the screen plate is in a visual positioning mode in the screen plate sleeve position alignment system, the screen plate positioning precision is greatly improved, the machine adjusting efficiency can be effectively and greatly improved, and the screen plate sleeve position alignment system has unique advantages particularly for producing small orders;

5. the system can also be matched with a motion control and execution mechanism to realize the automatic alignment function of the screen printing plate of the elliptical machine. The automation level of the elliptical printing machine is improved, and the iterative upgrade of the equipment technology is promoted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic flow chart of a screen alignment method of an elliptical printing machine according to a first embodiment of the present invention.

Fig. 2 is a schematic flow chart of a screen alignment method for an elliptical printing machine according to a second embodiment of the present invention.

Fig. 3 is a schematic view of the alignment system in a front view.

FIG. 4 is a side view of the alignment system of the present invention.

FIG. 5 is a schematic top view of the alignment system of the present invention.

FIG. 6 is a schematic bottom view of the alignment system of the present invention.

Fig. 7 is a partially enlarged structural view of a portion a in fig. 3.

In the figure:

1-vision component, 2-micro industrial personal computer, 4-detachable rechargeable battery pack, 5-beam bottom plate, 6-bearing roller, 7-printing head, 8-height adjusting knob, 9-beam, 10-bearing roller, 11-rail, 12-height adjusting knob, 13-rail, 14-screen, 15-cover plate, 16-Y shaft knob, 17-X1 shaft knob, 18-mark point, 19-X2 shaft knob, 20-heat-insulating layer, 21-camera, 22-lens, 23-corner coaxial light source, 24-positioning structure, 25-external power interface, 26-external data port, 27-external display interface, 28-power switch and 30-platen.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1 and 2, a screen alignment method of an elliptical printing machine according to an embodiment of the present invention includes the steps of:

and S1, starting the system and positioning the alignment system. In this embodiment, the system refers to an alignment system that is activated and then moved to the print head for positioning. Alignment system positioning refers to the positioning of the platen, which is equipped with an alignment system, at the print head, which provides an absolute reference for the screen adjustment of the print head.

And S2, roughly adjusting the screen to enable the mark points on the screen to enter the visual field range of the alignment system. In the present embodiment, the marker point enters an area that can be photographed by the camera of the alignment system through coarse adjustment.

And S3, measuring the coordinate values of the mark points in real time, and calculating the coordinate difference and the angle difference between the coordinate values of the mark points and the preset coordinates in real time. In this embodiment, the predetermined coordinate refers to an origin of a predetermined coordinate system.

And S4, adjusting the position of the screen printing plate according to the calculated coordinate difference value and the calculated angle difference value so as to enable the mark points to approach the preset coordinates.

And S5, repeating the steps S3 and S4 until the coordinate difference value and the angle difference value between the coordinate value of the marking point and the preset coordinate value are within the preset difference value range.

Referring to fig. 1, in an embodiment, between the steps S3 and S4, the method further includes: and displaying the coordinate difference value and the angle difference value in the step S3 in real time, so as to allow an operator to perform manual adjustment according to the displayed coordinate difference value and the displayed angle difference value, that is, the operator performs corresponding adjustment according to the displayed coordinate difference value and the displayed angle difference value, so that the difference value between the coordinate value of the mark point and the coordinate value preset by the system is gradually reduced.

Referring to fig. 2, in an embodiment, the adjusting the screen position in step S4 is completed by a driving part. That is, in the present embodiment, the drive means is used instead of the manual work to adjust the screen position. For example, the PLC motion control unit receives the coordinate difference and the angle difference transmitted in a wireless manner, and then controls the driving unit (e.g., the servo motor) to drive the screen to move, so as to drive the mark points on the screen to approach the preset coordinates. And simultaneously, the coordinate difference value and the angle difference value can be displayed in real time through a display, so that an operator can monitor the automatic adjustment result.

In order to enable the alignment system to be capable of being quickly and simply aligned with the screens on different printing stations and improve the manufacturing precision of the mark points on the screens, namely to ensure that the mark points on different screens are all located at the same position, the mark points on the screens are manufactured by adopting digital plate making. During printing, the positioning platen is first positioned at the first station print head with the alignment system, and then the alignment system is used to align the screen at that station. The positioning platen is then transferred to the next print station with the alignment system first positioned and then used to align the screen at that station. And repeating the steps until the screen printing plates at all the stations are aligned, and then starting the printing operation. The screen printing plate at each printing head station is aligned by the single alignment system, so that the cost can be reduced.

Referring to fig. 3 to 7, a screen alignment system according to an embodiment of the present invention is applied to an elliptical decorating machine. The elliptical printing machine can comprise a printing head 7 and a platen 30, wherein the platen 30 is restrained on two main and auxiliary tracks 11 and 13 of the elliptical printing machine through a bottom plate of a cross beam 9 and bearing rollers 10 and 6, and circulates along the tracks 11 and 13 together with other platens under the driving of a servo motor and a chain. It should be noted that the elliptical printing machine may include a plurality of print heads 7 and a corresponding number of screens 14, each screen 14 being mounted on a corresponding print head 7, the plurality of screens 14 having different print patterns. A substrate is placed on a plurality of platens 30, each platen 30 together with the substrate being moved along the rails 11, 13 in turn to be beneath the print heads 7 at different stations. In one station the print head 7 and screen 14 connected thereto cooperate to print the pattern on the screen 14 onto the substrate, after which the platen 30 is moved to the next station.

In order to accurately position the screens 14, the marking points on different screens 14 are all in the same position, that is, a plurality of screens 14 are stacked on a horizontal plane, and the projections of the plurality of marking points on the horizontal plane are overlapped. In the present embodiment, each screen 14 has at least two mark points, and two mark points (hereinafter, referred to as a first mark point and a second mark point) are taken as an example for description. When the plurality of screen plates 14 are stacked on a horizontal plane, the projections of the first mark points on the horizontal plane coincide with each other, and the projections of the second mark points on the horizontal plane coincide with each other. In this embodiment, one of the platens of the elliptical printing machine can be used as the positioning platen 30, i.e. the vision assembly 1 and the mini-industrial personal computer 2 (described in more detail below) in the alignment system are provided on this platen 30, except that the positioning platen 30 has the same function as the other platens, i.e. for carrying the substrate. When the screen plate 14 of a certain station needs to be positioned, the positioning platen 30 is moved to a predetermined position below the screen plate 14, and through the above steps, the screen plate 14 of the station can be accurately positioned by the positioning platen 30. The specific configuration of the alignment system is as follows.

In one embodiment, the alignment system comprises a screen plate 14, a vision assembly 1, a miniature industrial personal computer 2 and a position adjusting assembly. At least two marking points 18 are provided on the screen 14, and the screen 14 is mounted below a print head 7. In the present embodiment, the marker point is an intersection of cross lines. The arrangement of the mark points corresponds to the positioning through holes on the platen 30 (i.e. the positioning platen), and when the screen 14 and the platen 30 are completely aligned, the mark points 18 are respectively located on the axes of the positioning through holes on the platen 30.

The number and position of the vision assemblies 1 correspond to the marking points 18 on the screen 14, i.e. one marking point corresponds to one vision assembly 1. The vision assembly 1 comprises a corner coaxial light source 23, a lens 22 and a camera 21. The miniature industrial personal computer 2 is electrically connected with the visual component 1 to transmit signals between the visual component 1 and the miniature industrial personal computer 2 is used for processing data in the visual component 1. The vision assembly 1 is fixed below the platen 30, light emitted by the corner coaxial light source 23 can pass through the positioning holes on the platen 30 to irradiate the screen plate 14, light reflected by the screen plate 14 is reflected by the corner coaxial light source 23 and passes through the lens to reach the camera 21, and the camera 21 is used for shooting the screen plate 14. The micro industrial personal computer 2 is configured to receive an image captured by the camera 21, determine a positional relationship between a mark point on the screen plate 14 and a positioning hole on the platen 30 according to the image, and output prompt information when the screen plate 14 moves to a desired position. For example, in one embodiment, the alignment system further includes a display, the display is in communication connection with the micro industrial personal computer 2, and the display is used for displaying the image captured by the camera 21 and displaying the prompt information, that is, displaying the deviation information between the screen printing plate mark point and the system setting range. It will be appreciated that the angled coaxial light source 23 is a special coaxial light source, which may be replaced by a reflective prism and a coaxial light source.

A position adjustment assembly is associated with the screen 14 and functions to adjust the position of the screen 14 in the X-axis and Y-axis directions so as to gradually move the screen 14 to a desired predetermined position. The platen 30 is disposed at a predetermined position below the screen plate 14. In one embodiment, the elliptical printing machine is further provided with an external data port 26, an external display interface 27, an external power interface 25 and a power switch 28. The bottom of the elliptical pattern printer is also provided with a beam bottom plate 5, an accurate positioning structure 24 is also arranged below the beam bottom plate 5, and the alignment system can realize accurate positioning at the position of the printing head 7.

In one embodiment, in order to prevent heat generated during the production process from damaging the alignment system, a thermal insulation layer 20 is further provided between the platen 30 and the vision assembly 1 and the micro industrial computer 2, thereby preventing heat from being transferred to the vision assembly 1 and the micro industrial computer 2 via the platen 30.

In one embodiment, in order to provide the screen plate 14 with a suitable height position, the alignment system further includes height adjusting knobs 8 and 12 for adjusting the height of the screen plate 14, the height adjusting knobs 8 and 12 are disposed on the left and right sides of the bottom end of the screen plate 14 for adjusting the position height of the left and right sides of the screen plate 14, in this embodiment, the height adjusting knobs 8 and 12 are connected to a transmission structure (e.g., a lead screw nut structure), and the rotation of the knobs 8 and 12 can be further a linear motion required for moving the screen plate 14. It will be appreciated that other conventional drive configurations may be used, as desired.

In one embodiment, the position adjustment assembly includes X1 axis knobs 17 and X2 axis knobs 19 for adjusting the lateral movement of screen 14 and Y axis knobs 16 for adjusting the longitudinal movement of screen 14. Similarly, the knobs 16, 17, 19 are connected to a drive mechanism (e.g., a lead screw nut mechanism), and rotation of the knobs 16, 17, 19 can be translated into the linear motion required to move the screen 14. It will be appreciated that other conventional drive configurations may be used, as desired.

In one embodiment, the alignment system further comprises a detachable rechargeable battery pack 4 as a system power supply, and the detachable rechargeable battery pack 4 is electrically connected with the vision assembly 1 and the miniature industrial personal computer 2.

In some embodiments, the platen 30 further comprises a cover plate 15, and the cover plate 15 is used to cover the positioning hole, i.e. when the alignment system is in a non-operating state, the cover plate 15 is used to cover the positioning hole, and impurities are prevented from entering the corner coaxial light source 23 through the positioning hole. The platen 30 can perform the same function as other platens.

When the screen printing plate 14 is used, the screen printing plate 14 is firstly installed on a printing head 7 of an elliptical printing machine, then the bedplate 30 is positioned at a preset position below the printing head 7, the height of the screen printing plate 14 is adjusted through the height knob, and the power switch 28 is turned on, so that light emitted by the corner coaxial light source 23 penetrates through a positioning hole in the bedplate 30 and irradiates the screen printing plate 14. Thereafter, the X1 axis knob 17, the X2 axis knob 19, and the Y axis knob 16, which control the position of the screen plate 14, are rotated to adjust the position of the screen plate 14 relative to the platen 30, and during this process, the mark points 18 gradually approach the desired predetermined positions as the screen plate 14 moves until they enter the area that can be photographed by the camera 21, that is, the field of view of the alignment system, and coarse adjustment is completed. At this time, the micro industrial personal computer 2 runs the visual software, the visual software measures the coordinate values of the marking points in real time, and the coordinate difference value and the angle difference value between the current coordinate values and the preset coordinate values of the marking points on the screen 14 are calculated in real time. The vision software will output the image taken by the camera 21 and the coordinate difference and angle difference accordingly. For example, it may output the image, the coordinate difference value, and the angle difference value to a display, facilitating an operator to monitor the information in real time. Thereafter, the operator can manually correct the screen deviation based on the coordinate difference and the angle difference, i.e., adjust the position of the screen 14 by the knobs 16, 17, and 19. When the coordinate difference value and the angle difference value between the coordinate value of the mark point and the preset coordinate value are within the preset difference value range, the visual software outputs prompt information through the display to prompt an operator to finish the alignment of the screen printing plate. It will be appreciated that the above operations are repeated to achieve the required alignment of the screens 14 of the other stations.

In another embodiment, after the coarse adjustment is completed, the further adjustment of the screen 14 is automatically completed by the micro-industrial personal computer 2 controlling the actuator, so that the screen deviation does not need to be corrected manually by a human. Specifically, in this embodiment, the alignment system further includes a PLC controller and a servo motor, the PLC controller is electrically connected to the micro industrial personal computer 2 and the servo motor, the micro industrial personal computer 2 transmits information of the calculated and measured coordinate difference and the angle difference to the PLC controller in a wireless communication manner, the PLC performs corresponding logic operation according to the received signal and sends an operation instruction to the servo motor, and the servo motor further drives the screen to operate, so that the deviation between the position of the screen 14 and the reference position is smaller than the set accuracy range.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.