A CNC cutting machine with a wide-band scanning camera and a visual positioning control method

Abstract

This invention discloses a wide-format scanning camera-based CNC cutting machine and a vision positioning control method. Based on the main frame of an existing CNC cutting machine, a wide-format scanning camera and a vision positioning control system are added. Before cutting printed materials such as leather, shoe uppers, and fabrics, the wide-format scanning camera scans and photographs the printed materials. The vision positioning control system extracts the outline and features from the image to obtain the coordinate position and angle of the graphic to be cut. The CNC cutting machine drives the cutting head to move above the graphic, aligning the angle of the rotating die with the graphic. The cutting head then presses down on the die to complete the cutting. Compared to existing vision-aligned automatic cutting machines that require repeated photography and offset calculations, and can only cut one part per photograph, this invention allows for the cutting of a large area of ​​multiple parts with a single scan, greatly improving cutting accuracy and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of automatic cutting machine technology, and in particular to a CNC cutting machine capable of recognizing and processing leather, shoe uppers, and fabrics printed with patterned trademarks. Background Technology

[0002] CNC cutting machines, also known as automatic feeding machines or automatic punching machines, are used to cut and shape non-metallic materials such as leather, textiles, paper, rubber, and packaging materials by using the punching pressure generated by the die head pushing the die downwards.

[0003] With the widespread adoption of digital printing technology, people now frequently use leather and fabrics with pre-printed patterns and logos on shoes, bags, and other items. While these materials are beautiful and aesthetically pleasing, they increase the difficulty of the cutting process. Currently, factories use die-cutting molds made of transparent acrylic, manually aligning the outline of the pattern on the material using the transparency of the acrylic. However, this method suffers from high die-cutting mold costs and low efficiency. To address this issue, manufacturers have invented an automatic cutting machine with camera-based vision alignment. However, this machine uses a standard industrial camera, resulting in low image clarity and distortion. Furthermore, this model suffers from drawbacks such as the need for repeated photography and offset calculations, the ability to cut only one part per photograph, and low cutting accuracy.

[0004] The currently available vision alignment automatic cutting machines are listed below. Figure 1 As shown, an industrial camera a6 is located on the side of the machine head a1. The machine head a1 is suspended onto the gantry frame a3 via a slider a2. A motor a7 rotates a lead screw a4 to drive the machine head a1 to move laterally left and right. The die-cutting disc a5 on the machine head a1 rotates to change the direction of the die-cutting. The machine head a1 moves downwards and presses down on the die-cutting to cut the material. The industrial camera a6 is used to photograph the material. Figure 2 As shown, the existing vision alignment automatic cutting machine can only cut one part per photo, requiring repeated photos and repeated calculations of the offset. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention discloses a wide-format scanning camera-based CNC cutting machine and a visual positioning control method. Specifically, it adds a wide-format scanning camera and a visual positioning control system to the main framework and technical solution disclosed in our prior patent application (CN202211154493.5), which describes a fully automatic large-format gantry platform cutting machine. This enables rapid, large-area, and high-precision cutting of printed patterned materials such as leather and shoe uppers.

[0006] The invention concept of a wide-band scanning camera-based CNC cutting machine and a vision positioning control method is as follows:

[0007] The U-axis servo feeding mechanism first transports the printed patterned leather, shoe upper, or fabric from the rear of the CNC cutting machine to below the Z-axis servo lifting cutting head. A wide-format scanning camera descends via a precision guide rail slide cylinder, approaching the material with the printed pattern in the cutable area. The Y-axis servo forward / backward motion mechanism drives the wide-format scanning camera, mounted on the side of the first crossbeam of the X-axis servo left / right motion mechanism, to move horizontally backward to scan and take pictures. The captured images are then transmitted to the vision positioning control system. The vision positioning control system extracts the outline and features from the images and performs similarity matching with a pre-made template that matches the outline shape in the images. This similarity is adjustable. The template has a 4mm*4mm "V"-shaped graphic file at its center, with the angle of the "V" aligned with the initial angle of the die. When the outline and features in the image match the template... A successful match requires a similarity score of over 90%. Matches with a similarity score below 90%, meaning incomplete scanned patterns or incomplete printed patterns on the material, will not be successful. After a successful match, the vision positioning control system transmits a "V"-shaped graphic file containing coordinate positions and angles to the CNC cutting machine. This graphic file is in DXF or PLT format. Based on the coordinate positions and angles of the "V"-shaped file from the vision positioning control system, the CNC cutting machine drives the Y-axis servo forward and backward motion mechanism and the X-axis servo left and right motion mechanism to move the Z-axis servo lifting cutting head, which contains the die and has the same outline shape as the printed pattern, above the graphic to be cut. The R-axis servo die rotation mechanism rotates the die to the same angle as the graphic to be cut, and the Z-axis servo lifting cutting head presses down to complete the cutting of the material with the printed pattern, until all scanned and matched patterns are completed.

[0008] The present invention adopts the following technical solution:

[0009] A numerical control cutting machine for a wide - bandwidth scanning camera, comprising a large - format gantry platform, a Y - axis servo forward - backward movement mechanism, an X - axis servo left - right movement mechanism, a Z - axis servo lifting and cutting head, an R - axis servo die - cutting tool rotation mechanism, and a U - axis servo feeding mechanism. The Y - axis servo forward - backward movement mechanism and the X - axis servo left - right movement mechanism are arranged inside the large - format gantry platform. The Z - axis servo lifting and cutting head is installed on the X - axis servo left - right movement mechanism, and an R - axis servo die - cutting tool rotation mechanism is provided at its lower end. The Z - axis servo lifting and cutting head moves horizontally forward - backward and left - right inside the large - format gantry platform under the control of the Y - axis servo forward - backward movement mechanism and the X - axis servo left - right movement mechanism. The R - axis servo die - cutting tool rotation mechanism controls the angular direction of the die - cutting tool. The Z - axis servo lifting and cutting head controls the lifting of the die - cutting tool below the R - axis servo die - cutting tool rotation mechanism to cut leather, shoe uppers, and other fabrics with printed patterns on the U - axis wear - resistant conveyor belt of the U - axis servo feeding mechanism inside the large - format gantry platform. It is characterized in that: it further includes a wide - bandwidth scanning camera and a visual positioning control system. At both ends of the wide - bandwidth scanning camera, precision guide rail slide - table cylinders are installed for the lifting of the wide - bandwidth scanning camera. The precision guide rail slide - table cylinders are installed on the side of the first cross - beam of the X - axis. Before cutting various materials with printed patterns such as leather, shoe uppers, and fabrics with printed patterns, the wide - bandwidth scanning camera descends close to the material with the printed pattern in the cut - able area through the precision guide rail slide - table cylinders. The Y - axis servo movement mechanism drives the wide - bandwidth scanning camera installed on the first cross - beam of the X - axis to move backward horizontally for scanning and taking pictures, and then transmits the taken pictures to the visual positioning control system. The visual positioning control system extracts the outer frame contour and features on the picture, and performs similarity matching with a template that is pre - made on the visual positioning control system and has the same outer frame contour features as the picture. A "herringbone" icon is provided at the center point of the template, and the format is DXF. Once the similarity setting value is reached, that is, after successful matching, the visual positioning control system will send the "herringbone" icon containing the coordinate position and angular direction to the motion control system of the numerical control cutting machine. The numerical control cutting machine drives the Y - axis servo forward - backward movement mechanism and the X - axis servo left - right movement mechanism to move the Z - axis servo lifting and cutting head with a die - cutting tool shape the same as the outer frame contour of the printed pattern to the upper part of the cut - able pattern according to the coordinate position and angle of the "herringbone" icon of the visual positioning control system. The R - axis servo die - cutting tool rotation mechanism rotates the die - cutting tool to an angular direction consistent with the cut - able pattern, and the Z - axis servo lifting and cutting head presses down to complete the cutting of the material with the printed pattern until all scanned and photographed patterns are successfully matched; there is a network cable connection between the wide - bandwidth scanning camera and the visual positioning control system, and the taken pictures are transmitted to the visual positioning control system through the network cable. There is also a network cable connection between the visual positioning control system and the motion control system of the numerical control cutting machine.

[0010] The present invention also discloses a visual positioning control method for the above - mentioned numerical control cutting machine for a wide - bandwidth scanning camera, which is characterized in that the method includes:

[0011] Calibration of the coordinates and the initial angle direction of the tool die among the numerical control cutting machine, the wide -幅 scanning camera and the visual positioning control system. The calibration includes the following steps:

[0012] The first step: Install a "仐"-shaped tool die with a size of 30mm * 30mm at the center point on the R - axis tool die mounting plate in the R - axis tool die rotating mechanism of the Z - axis servo - lifting cutting head on the numerical control cutting machine;

[0013] The second step: Make a DXF file consistent with the "仐"-shaped tool die using CAD software. The numerical control cutting machine software opens this DXF file and arranges it at intervals of 100mm left - right and up - down starting from the X - and Y - axis zero points of the numerical control cutting machine page until the layout is full. The size of the layout depends on the maximum travel of the X - axis and Y - axis of the numerical control cutting machine;

[0014] The third step: Place a blank cardboard or fabric larger than the maximum travel of the X - axis and Y - axis of the numerical control cutting machine above the U - axis wear - resistant conveyor belt on the large - format lower pressure - bearing platform of the numerical control cutting machine. The numerical control cutting machine executes the DXF file on the software page and cuts all the "仐"-shaped patterns on the blank cardboard or fabric;

[0015] The fourth step: Lower the wide -幅 scanning camera close to the cut pattern. The Y - axis servo motion mechanism drives the wide -幅 scanning camera installed on the first cross - beam of the X - axis to move horizontally backward for scanning and taking pictures, and then transmits the taken pictures to the visual positioning control system;

[0016] The fifth step: The visual positioning control system identifies and corrects based on the center point of the "十" - shaped outer contour on the "仐"-shaped pattern in the picture, calibrates and saves the relative coordinate positions of the wide -幅 scanning camera, the visual positioning control system and the numerical control cutting machine. Then, the visual positioning control system also identifies and corrects based on the "人" - shaped outer contour on the "仐"-shaped pattern in the picture, and uses the triangular points of the "人" - shape to calibrate and save the initial angle direction of the tool die below the R - axis servo tool die rotating mechanism of the wide -幅 scanning camera, the visual positioning control system and the numerical control cutting machine. The purpose of calibration is to make the wide -幅 scanning camera, the visual positioning control system and the numerical control cutting machine have a common coordinate position and direction angle;

[0017] From the description of the structure of the present invention above, compared with the existing vision - aligned automatic cutting machine, the wide -幅 scanning camera of the present invention mainly has the following advantages: The image is output without distortion at a ratio of 1:; It overcomes the distortion problem existing in the traditional camera lens; The positioning is more accurate (the ultimate positioning accuracy can reach 0.1 mm); It can scan and take pictures of a large - area material printed with patterns at one time. The visual positioning control method is more accurate, simple and fast, without having to repeatedly calculate the offset and the tool die angle direction, greatly improving the cutting accuracy and production efficiency of materials such as leather and shoe uppers printed with patterns. Brief Description of the Drawings

[0018] Figure 1 This is a schematic diagram of the structure of an existing vision alignment automatic cutting machine.

[0019] Figure 2 This is a schematic diagram of the photo alignment and cutting path of an existing vision alignment automatic cutting machine for printed patterned materials.

[0020] Figure 3 This is a schematic plan view of the entire invention.

[0021] Figure 4 This is a top view of the structure of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the large-format bearing plate after it has been removed according to the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the Y-axis servo forward and backward motion mechanism and the X-axis servo left and right motion mechanism of the present invention.

[0024] Figure 7 for Figure 6 A schematic diagram of the structure of A in the middle.

[0025] Figure 8 for Figure 6 A schematic diagram of the structure of B in the middle.

[0026] Figure 9 This is a three-dimensional structural diagram of the wide-scanning camera, the Y-axis servo forward and backward motion mechanism, and the X-axis servo left and right motion mechanism of the present invention.

[0027] Figure 10 for Figure 9 A schematic diagram of the structure of E in the middle.

[0028] Figure 11 This is a three-dimensional structural diagram of the Z-axis servo lifting cutting head and the R-axis servo die rotation mechanism of the present invention.

[0029] Figure 12 This is an exploded view of the Z-axis servo lifting cutting head and the R-axis servo die rotation mechanism of the present invention.

[0030] Figure 13 This is a cross-sectional schematic diagram of the present invention.

[0031] Figure 14 for Figure 13 A schematic diagram of the structure of C.

[0032] Figure 15 for Figure 13 A schematic diagram of the structure of D.

[0033] Figure 16This is a schematic diagram illustrating the wide-format scanning, photographing, positioning, and cutting path of printed patterned materials according to the present invention.

[0034] List of reference numerals

[0035] Machine head a1, slider a2, gantry a3, lead screw a4, die-cutting disc a5, industrial camera a6, motor a7.

[0036] Large format pressure plate 11, large format lower pressure platform 12, support connecting column 13, die 53, Y-axis servo motor 2, Y-axis linear guide 21, Y-axis support connecting plate 22, Y-axis rack 23, Y-axis gear 24, Y-axis track bracket 14, Y-axis reducer 34, Y-axis slider 32, X-axis second crossbeam 26, X-axis first crossbeam 27, X-axis servo motor 29, X-axis sliding plate 31, X-axis linear guide 35, X-axis rack 36, X-axis slider 38, X-axis reducer 39, X-axis gear 40, C-type support plate 51, Z-axis guide column 511, Z-axis guide copper sleeve 33, Z-axis guide column connecting plate 7, R-axis fixing plate 5, R-axis die mounting plate 52, R-axis die rotation shaft 521, R-axis passive synchronous pulley; 522, R-axis synchronous belt; 523, R-axis die-cutting fixing plate; 524, R-axis main synchronous pulley; 525, U-axis feeding roller bracket; 18, U-axis cut-resistant conveyor belt; 6, U-axis servo feeding mechanism; 8, U-axis feeding lower support plate; 82, U-axis feeding upper clamping plate; 83, U-axis clamping cylinder; 84, U-axis feeding push plate; 85, U-axis feeding lead screw; 86, U-axis servo motor; 25, U-axis reducer; 28, Z-axis high-thrust folding servo electric cylinder; 1, base; 41, R-axis servo motor; 65, U-axis roller; 48, output threaded shaft head; 45, R-axis rotary bearing; 60, wide-format scanning camera; 91, precision guide rail slide cylinder; 92, vision positioning control system; 93, motion control system; 15. Detailed Implementation

[0037] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0038] A wide-format scanning camera-based CNC cutting machine includes a large-format gantry platform, a Y-axis servo forward and backward motion mechanism, an X-axis servo left and right motion mechanism, a Z-axis servo lifting cutting head, an R-axis servo die rotation mechanism, a U-axis servo feeding mechanism, a wide-format scanning camera 91, and a vision positioning control system 93. The Y-axis servo forward and backward motion mechanism and the X-axis servo left and right motion mechanism are located within the large-format gantry platform. The Z-axis servo lifting cutting head is mounted on the X-axis servo left and right motion mechanism, and its lower end is equipped with an R-axis servo die rotation mechanism. Under the control of the Y-axis servo forward and backward motion mechanism and the X-axis servo left and right motion mechanism, the Z-axis servo lifting cutting head moves horizontally forward and backward and left and right within the large-format gantry platform. The R-axis servo die rotation mechanism controls the angle and direction of the die 53, and the Z-axis servo lifting cutting head controls the lifting and lowering of the die 53 below the R-axis servo die rotation mechanism. This machine cuts leather, shoe uppers, and other materials printed with patterns on the U-axis cutting conveyor belt 6 of the U-axis servo feeding mechanism within the large-format gantry platform.

[0039] As attached Figure 9 and 10 As shown, the wide-format scanning camera 91 is mounted on the side of the first crossbeam 27 of the X-axis servo left and right motion mechanism for lifting and lowering. Specifically, the wide-format scanning camera 91 includes precision guide rail slide cylinders 92, which are respectively mounted at both ends of the first crossbeam 27 of the X-axis servo left and right motion mechanism. The wide-format scanning camera 91 is mounted on the two precision guide rail slide cylinders 92, which are used for lifting and lowering the wide-format scanning camera 91. (See attached diagram.) Figure 16Before cutting various printed materials such as printed leather and shoe uppers as shown, the wide - format scanning camera 91 descends close to the material with a printed pattern in the cut - able area through the precision guide rail sliding - table cylinder 92. Then, the Y - axis servo motor 2 drives the Y - axis gear 24 through the Y - axis reduction gear 34. By using the meshing between the Y - axis gear 24 and the Y - axis rack 23, the Y - axis support connecting plate 22 drives the X - axis first cross - beam 27 and the Y - axis slide block 32 to move horizontally backward along the Y - axis linear guide rail 21, so that the wide - format scanning camera 91 moves horizontally backward for scanning and photographing. Then, the taken picture is transmitted to the visual positioning control system 93. The visual positioning control system 93 extracts the outer - frame contour and features on the picture and performs similarity matching with a template pre - made on the visual positioning control system 93 and having the same outer - frame contour features as those on the picture. There is a "V - shaped" icon at the center point of the template, and the format is DXF. Once the similarity set value is reached, that is, after successful matching, the visual positioning control system 93 sends the "V - shaped" icon containing the coordinate position and angular direction to the motion control system 15 of the numerical control cutting machine. The numerical control cutting machine drives the Y - axis servo forward - backward motion mechanism and the X - axis servo left - right motion mechanism according to the coordinate position and angle of the "V - shaped" icon of the visual positioning control system 93, and moves the Z - axis servo lifting and cutting head with the same shape as the outer - frame contour of the printed pattern above the cut - to - be graphic. The R - axis servo tool - die rotating mechanism rotates the tool - die 53 to the same angular direction as the cut - to - be graphic, and the Z - axis servo lifting and cutting head presses down to complete the cutting of the material with a printed pattern until all scanned, photographed, and successfully - matched patterns are completed. And there is a network cable connection between the wide - format scanning camera 91 and the visual positioning control system 93. The taken picture is transmitted to the visual positioning control system 93 through the network cable. There is also a network cable connection between the visual positioning control system 93 and the motion control system 15 of the numerical control cutting machine. Specifically, as shown in the appendix Figure 3 As shown, the motion control system 15 is located in the middle - right position of the numerical control cutting machine, and the visual positioning control system 93 is located beside the numerical control cutting machine. The motion control system 15 is used to control the motion of the Y - axis servo forward - backward motion mechanism, the X - axis servo left - right motion mechanism, the Z - axis servo lifting and cutting head, the R - axis servo tool - die rotating mechanism, the U - axis servo feeding mechanism, and the wide - format scanning camera 91.

[0040] Among them, as shown in the appendix Figure 3 、 4As shown in Figure 5, the large-format gantry platform includes a large-format upper pressure plate 11, a large-format lower pressure platform 12, and supporting connecting columns 13. The large-format upper pressure plate 11 is installed above the large-format lower pressure platform 12 through several supporting connecting columns 13. The large-format upper pressure plate 11 and the large-format lower pressure platform 12 are parallel to each other and are in a horizontal state. They are mainly used to withstand the impact force of the Z-axis servo lifting cutting head pushing the die to cut the material upward. Y-axis track brackets 14 are installed on the left and right sides above the large-format lower pressure platform 12.

[0041] As attached Figure 6 and 7 As shown, the Y-axis servo forward and backward motion mechanism includes a Y-axis track support 14, a Y-axis linear guide 21, a Y-axis slider 32, a Y-axis gear 24, a Y-axis rack 23, a Y-axis servo motor 2, a Y-axis reducer 34, and a Y-axis support connecting plate 22. The Y-axis track support 14 is equipped with a Y-axis linear guide 21 and a Y-axis rack 23. The Y-axis linear guide 21 is equipped with a Y-axis slider 32, and the Y-axis slider 32 is equipped with a Y-axis support connecting plate 22. A Y-axis reducer 34 is mounted in the middle above the Y-axis support connecting plate 22. The output shaft of the Y-axis reducer 34 is equipped with a Y-axis gear 24 that meshes with the Y-axis rack 23. The Y-axis servo motor 2 is mounted above the Y-axis reducer 34. It is mainly used for the forward and backward motion of the Z-axis servo lifting and lowering cutting head.

[0042] As attached Figure 6 , 8 As shown in Figure 10, the X-axis servo left and right motion mechanism includes an X-axis first crossbeam 27, an X-axis second crossbeam 26, an X-axis linear guide rail 35, an X-axis slider 38, an X-axis gear 40, an X-axis rack 36, an X-axis servo motor 29, an X-axis reducer 39, and an X-axis sliding plate 31. The X-axis first crossbeam 27 and the X-axis second crossbeam 26 are respectively mounted on the front and rear ends of the Y-axis support connecting plate 22. Precision guide rail slide cylinders 92 are respectively installed on both sides of the X-axis first crossbeam 27. The wide-format scanning camera 91 is mounted on the two precision guide rail slide cylinders 92. The precision guide rail slide cylinders 92 are used for wide-format scanning. The camera 91 is raised and lowered. Above the first X-axis crossbeam 27, there is an X-axis rack 36 and an X-axis linear guide 35. The X-axis linear guide 35 is equipped with an X-axis slider 38. Above the second X-axis crossbeam 26, there is an X-axis linear guide 35. The X-axis linear guide 35 is equipped with an X-axis slider 38. Above the X-axis slider 38, there is an X-axis sliding plate 31. One side of the X-axis sliding plate 31 is equipped with an X-axis reducer 39. The output shaft of the X-axis reducer 39 is equipped with an X-axis gear 40 that meshes with the X-axis rack 36. Above the X-axis reducer 39, there is an X-axis servo motor 29, which is mainly used for the left and right movement of the Z-axis servo lifting and lowering cutting head.

[0043] As attached Figure 11 , 12As shown in Figure 14, the Z-axis servo lifting cutting head includes a Z-axis high-thrust folding servo electric cylinder 1, a Z-axis guide column 511, a Z-axis guide copper sleeve 33, and a Z-axis guide column connecting plate 7. The Z-axis high-thrust folding servo electric cylinder 1 is mounted in the middle above the X-axis sliding plate 31. The base 41 of the Z-axis high-thrust folding servo electric cylinder 1 is fitted tightly against the pressure plate 11 on the large surface. The output threaded shaft 45 of the Z-axis high-thrust folding servo electric cylinder 1 passes through the X-axis sliding plate 31 and is connected to the C-shaped support plate 51 of the R-axis servo die rotation mechanism. It is mainly used to push the die 53 to move downward to cut the material.

[0044] As attached Figure 12 As shown, the R-axis servo die rotation mechanism includes an R-axis fixed plate 5, a C-shaped support plate 51, an R-axis servo motor 65, an R-axis main synchronous pulley 525, an R-axis synchronous belt 523, an R-axis passive synchronous pulley 522, an R-axis die rotation shaft 521, an R-axis rotary bearing 60, an R-axis die mounting plate 52, and an R-axis die fixing piece 524. The C-shaped support plate 51 is mounted above the R-axis fixed plate 5. The R-axis servo motor 65 is mounted on the left side of the R-axis fixed plate 5. The R-axis main synchronous pulley 525 is mounted on the output shaft of the R-axis servo motor 65. The R-axis synchronous belt 523 is mounted on the R-axis main synchronous pulley 525. The other end of the R-axis synchronous belt 523... The device is equipped with an R-axis passive synchronous pulley 522, an R-axis die-cutting rotating shaft 521 in the middle of the R-axis passive synchronous pulley 522, an R-axis rotary bearing 60 in the middle of the R-axis die-cutting rotating shaft 521, and the other end of the R-axis die-cutting rotating shaft 521 is connected to the R-axis die-cutting mounting plate 52. The four sides of the R-axis die-cutting mounting plate 52 are equipped with R-axis die-cutting fixing plates 524. The die-cutting 53 is installed below the R-axis die-cutting mounting plate 52. A Z-axis guide post 511 is also installed above the R-axis fixing plate 5. The Z-axis guide post 511 passes through the X-axis sliding plate 31 and the Z-axis guide copper sleeve 33 and is connected to the Z-axis guide post connecting plate 7. It is mainly used to change the angle of the die-cutting 53.

[0045] As attached Figure 13 and 15As shown in the figure, the U-axis servo feeding mechanism 8 includes a U-axis feeding roller bracket 18, a U-axis roller 48, a U-axis cut-resistant conveyor belt 6, a U-axis feeding lower support plate 82, a U-axis feeding upper clamping plate 83, a U-axis clamping cylinder 84, a U-axis feeding push plate 85, a U-axis feeding screw rod 86, a U-axis servo motor 25 and a U-axis reducer 28. The U-axis feeding roller brackets 18 are installed on both the front and rear sides of the large-format gantry platform. The U-axis rollers 48 are installed at both the front and rear ends of the U-axis feeding roller bracket 18. The U-axis cut-resistant conveyor belt 6 is installed on the U-axis roller 48. The U-axis feeding lower support plate 82 is installed behind the U-axis feeding roller bracket 18. The U-axis feeding upper clamping plate 83 is installed on the U-axis feeding lower support plate 82. The U-axis clamping cylinder 84 is installed above the U-axis feeding upper clamping plate 83. The U-axis feeding push plate 85 is also installed below the U-axis feeding lower support plate 82. The U-axis feeding screw rod 86 is installed in the middle of the U-axis feeding push plate 85. The U-axis feeding screw rod 86 is connected to the U-axis reducer 28. The U-axis servo motor 25 is installed on one side of the U-axis reducer 28. When feeding is required, the U-axis clamping cylinder 84 presses down and clamps the U-axis cut-resistant conveyor belt 6, the material and the U-axis feeding lower support plate 82 at the same time. The U-axis servo motor 25 drives the U-axis reducer 28 and the U-axis feeding screw rod 86 to rotate, pushing the U-axis feeding push plate 85, the U-axis feeding lower support plate 82, the U-axis cut-resistant conveyor belt 6 and the material to move forward together for feeding.

[0046] In order to specifically implement a vision positioning control method for a numerically controlled cutting machine with a wide-bandwidth scanning camera, it is necessary to calibrate the coordinates and the initial angular direction of the cutting die among the numerically controlled cutting machine, the wide-bandwidth scanning camera 91 and the vision positioning control system 93 in the early stage. The calibration includes the following steps:

[0047] The first step: Install a "仐"-shaped cutting die 53 with a size of 30mm * 30mm at the center point on the R-axis cutting die mounting plate 52 in the R-axis cutting die rotating mechanism of the Z-axis servo lifting cutting head on the numerically controlled cutting machine.

[0048] The second step: Make a DXF file consistent with the "仐"-shaped cutting die 53 in CAD software. Open the DXF file with the numerically controlled cutting machine software and start from the zero points of the X and Y axes of the numerically controlled cutting machine page at intervals of 100mm left and right and up and down until the layout is full. The size of the layout depends on the maximum travel of the X and Y axes of the numerically controlled cutting machine.

[0049] The third step: Place a blank cardboard or fabric larger than the maximum travel of the X and Y axes of the numerically controlled cutting machine above the U-axis cut-resistant conveyor belt 6 on the large-format lower bearing platform 12 of the numerically controlled cutting machine. The numerically controlled cutting machine executes the DXF file on the software page and cuts all the "仐"-shaped graphics on the blank cardboard or fabric.

[0050] Step 4: Lower the wide - format scanning camera 91 close to the pattern to be cut. The Y - axis servo motion mechanism drives the wide - format scanning camera 91 installed on the first cross - beam 27 of the X - axis to move horizontally backward for scanning and photographing, and then transmits the taken picture to the vision positioning control system 93;

[0051] Step 5: The vision positioning control system 93 performs recognition and calibration based on the center point of the "cross" outer - contour on the "仐" - shaped pattern in the picture, calibrates and saves the relative coordinate positions of the wide - format scanning camera 91, the vision positioning control system 93, and the numerical - control cutting machine. Then, the vision positioning control system 93 also performs recognition and calibration based on the "human" - shaped outer - contour on the "仐" - shaped pattern in the picture, and uses the triangular points of the "human" - shape to calibrate and save the initial angle direction of the cutting die 53 under the R - axis servo cutting - die rotating mechanism of the wide - format scanning camera 91, the vision positioning control system 93, and the numerical - control cutting machine. The purpose of calibration is to enable the wide - format scanning camera 91, the vision positioning control system 93, and the numerical - control cutting machine to have a common coordinate position and the direction angle of the cutting die 53.

[0052] The cutting method of a numerical - control cutting machine, the method comprises the following steps:

[0053] Step 1: The rear of the large - format gantry platform is the feeding end, and the front is the discharging end. The U - axis clamping cylinder 84 of the U - axis servo feeding mechanism presses down and simultaneously clamps the material printed with a pattern on the U - axis cut - resistant conveyor belt 6 and the U - axis feeding lower support plate 82. The U - axis servo motor 25 drives the U - axis reducer 28 and the U - axis feeding screw 86 to rotate, pushing the U - axis feeding push plate 85, the U - axis feeding lower support plate 82, the U - axis cut - resistant conveyor belt 6, and the material printed with a pattern to move forward together, transporting materials such as leather and shoe uppers printed with patterns to the cutting die 53 under the Z - axis servo lifting cutting head;

[0054] Step 2: The wide - format scanning camera 91 descends through the precision guide - rail sliding - table cylinder 92 close to the material with a printed pattern in the cut - able area;

[0055] Step 3: The Y - axis servo forward - backward motion mechanism drives the wide - format scanning camera 91 installed on the side of the first cross - beam 27 of the X - axis of the X - axis servo left - right motion mechanism to move horizontally backward for scanning and photographing, obtaining a JPG picture;

[0056] Step 4: Transmit the obtained JPG picture to the vision positioning control system 93;

[0057] Step 5: The vision positioning control system 93 extracts the outer - frame contour and features in the picture, and then performs similarity matching with a template pre - made on the vision positioning control system 93 and consistent with the outer - frame contour in the picture. The similarity can be adjusted. A "human" - shaped graphic file with a size of 4mm * 4mm is provided at the center point of the template, and the angle direction of the "human" - shape is consistent with the initial angle direction of the cutting die 53.

[0058] Step 6: A successful match will only be achieved when the similarity between the outline features of the image and the template exceeds 90%. If the similarity is less than 90%, the match will not be successful. The reason for the unsuccessful match is that the pattern scanned by the wide-format scanning camera 91 is incomplete or the pattern printed on the material is deformed and incomplete. After a successful match, the vision positioning control system 93 will send the "human" shaped graphic file containing the coordinate position and angle direction to the CNC cutting machine. The format of the graphic file is DXF or PLT.

[0059] Step 7: Based on the coordinate position and angle direction of the "human" shaped document in the vision positioning control system 93, the CNC cutting machine drives the Y-axis servo forward and backward motion mechanism and the X-axis servo left and right motion mechanism to move the Z-axis servo lifting cutting head, which is equipped with the die 53 and has the same shape as the outline of the printed pattern, above the graphic to be cut. The R-axis servo die rotation mechanism rotates the die to the same angle direction as the graphic to be cut. The Z-axis servo lifting cutting head presses down to complete the cutting of the material with the printed pattern, until all the scanned and photographed patterns are successfully matched.

[0060] Furthermore, it should be noted that the present invention can be improved or modified as follows according to actual working needs in specific implementations:

[0061] The Z-axis servo lifting cutting head can also be made without using the Z-axis high-thrust folding servo electric cylinder 1, and instead use a regular hydraulic cylinder cutting head or a pneumatic cylinder cutting head.

[0062] For CNC cutting machines without a Y-axis servo forward and backward motion mechanism, the wide-format scanning camera 91 and the precision guide rail slide cylinder 92 can be installed on the side of the first crossbeam of the X-axis and move synchronously with the first crossbeam 27 of the X-axis. Alternatively, the wide-format scanning camera 91 and the precision guide rail slide cylinder 92 can be installed on both sides of the large-format pressure platform 12, so that the wide-format scanning camera 91 is positioned above the U-axis servo feeding mechanism 8. The U-axis servo feeding mechanism 8 drives the printed material to move forward below the wide-format scanning camera 91 to complete the scanning and taking pictures.

[0063] In the description of this embodiment and description, some terms such as "calibration", "template", "matching", "human", "100mm", "DXF", "PLT", "30mm*30mm", "4mm*4mm", "ninety percent", "N", "X", "Y", "Z", "U", "R", "large format", "horizontal", "front and back", "left and right", "up and down", etc. are only used to describe the present invention and simplify the description, and therefore should not be construed as limiting the present invention.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. Those skilled in the art can still modify the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions should be considered to fall within the protection scope of the present invention.

Claims

1. A CNC cutting machine with a wide-format scanning camera, comprising a large-format gantry platform, a Y-axis servo forward / backward motion mechanism, an X-axis servo left / right motion mechanism, a Z-axis servo lifting cutting head, an R-axis servo die rotation mechanism, and a U-axis servo feeding mechanism. The Y-axis servo forward / backward motion mechanism and the X-axis servo left / right motion mechanism are disposed within the large-format gantry platform. The Z-axis servo lifting cutting head is mounted on the X-axis servo left / right motion mechanism, and its lower end is provided with the R-axis servo die rotation mechanism. Under the control of the Y-axis servo forward / backward motion mechanism and the X-axis servo left / right motion mechanism, the Z-axis servo lifting cutting head moves horizontally forward / backward and left / right within the large-format gantry platform. The R-axis servo die rotation mechanism controls the angle and direction of the die. The Z-axis servo lifting cutting head controls the lifting and lowering of the die below the R-axis servo die rotation mechanism. The machine cuts fabric with printed patterns on the U-axis cutting conveyor belt of the U-axis servo feeding mechanism within the large-format gantry platform. Its characteristic is that: It also includes a wide - format scanning camera and a visual positioning control system. Precision guide rail sliding table cylinders are installed at both ends of the wide - format scanning camera for lifting the wide - format scanning camera. The precision guide rail sliding table cylinders are installed on both sides of the first crossbeam of the X - axis. Before cutting the fabric printed with patterns, the wide - format scanning camera descends close to the material with printed patterns in the cut - off area through the precision guide rail sliding table cylinders. The Y - axis servo forward - backward movement mechanism drives the wide - format scanning camera installed on the first crossbeam of the X - axis to move horizontally backward for scanning and taking pictures, and then transmits the taken pictures to the visual positioning control system. The visual positioning control system extracts the outer frame contour and features on the picture, and performs similarity matching with a template pre - made on the visual positioning control system and having the same outer frame contour features as those on the picture. A "herringbone" icon is set at the center point of the template, and the format is DXF. Once the similarity set value is reached, that is, after successful matching, the visual positioning control system sends the "herringbone" icon containing the coordinate position and angle direction to the motion control system of the numerical control cutting machine. The numerical control cutting machine drives the Y - axis servo forward - backward movement mechanism and the X - axis servo left - right movement mechanism according to the coordinate position and angle of the "herringbone" icon of the visual positioning control system, and moves the Z - axis servo lifting cutting head with a tool die shape the same as the outer frame contour of the printed pattern above the cut - off pattern. The R - axis servo tool die rotation mechanism rotates the tool die to an angle direction consistent with the cut - off pattern, and the Z - axis servo lifting cutting head presses down to complete the cutting of the material with printed patterns until all scanned and photographed patterns with successful matching are completed. There is a network cable connection between the wide - format scanning camera and the visual positioning control system, and the taken pictures are transmitted to the visual positioning control system through the network cable. There is also a network cable connection between the visual positioning control system and the motion control system of the numerical control cutting machine.

2. The visual positioning control method for a CNC cutting machine with a wide-band scanning camera as described in claim 1, characterized in that, The method includes: Calibration of the coordinates and the initial angle direction of the tool die among the numerical control cutting machine, the wide - format scanning camera and the visual positioning control system, and the calibration includes the following steps: The first step: Install a 30mm * 30mm "仐" - shaped tool die at the center point on the R - axis tool die mounting plate under the R - axis tool die rotation mechanism of the Z - axis servo lifting cutting head on the numerical control cutting machine. The second step: Use CAD software to make a DXF - format file identical to the "仐" - shaped tool die. The numerical control cutting machine software opens the DXF - format file and starts from the X - and Y - axis zero points of the numerical control cutting machine page at intervals of 100mm left - right and up - down until the layout is full. The size of the layout is based on the effective stroke of the X - axis and Y - axis of the numerical control cutting machine. The third step: Place a blank cardboard or fabric larger than the effective stroke of the X - axis and Y - axis of the numerical control cutting machine above the U - axis cut - resistant conveyor belt on the large - format lower bearing platform of the numerical control cutting machine. The numerical control cutting machine executes the DXF - format file on the software page and cuts all the "仐" - shaped patterns on the blank cardboard or fabric. The fourth step: Lower the wide - format scanning camera close to the cut - off pattern. The Y - axis servo forward - backward movement mechanism drives the wide - format scanning camera installed on the first crossbeam of the X - axis to move horizontally backward for scanning and taking pictures, and then transmits the taken pictures to the visual positioning control system. Step 5: The vision positioning control system performs recognition and calibration based on the center point of the "cross" outer contour of the "仐"-shaped pattern on the picture, calibrates and saves the relative coordinate positions of the wide-format scanning camera, the vision positioning control system, and the numerical control cutting machine. Then, the vision positioning control system performs recognition and calibration based on the "human" outer contour of the "仐"-shaped pattern on the picture, and uses the triangular points of the "human" shape to calibrate and save the initial angle direction of the tool die under the R-axis servo tool die rotation mechanism of the wide-format scanning camera, the vision positioning control system, and the numerical control cutting machine. The purpose of calibration is to enable the wide-format scanning camera, the vision positioning control system, and the numerical control cutting machine to have the same coordinate positions and direction angles.

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