A kind of printing quality online visual inspection device and method

Abstract

The present application relates to an online visual inspection device and method for printing quality. The online visual inspection device for printing quality described in the present application includes: a winding mechanism, a first inspection mechanism, a second inspection mechanism, and a frame; the winding mechanism, the first inspection mechanism, and the second inspection mechanism are respectively installed on the frame; the first inspection mechanism is used to detect whether the label paper is qualified; the second inspection mechanism is used to detect whether the judgment on unqualified label paper is correct, if so, puncture the label paper; if not, the label paper is judged as qualified; the paper tape roll is sleeved on the driven roller, and is successively inspected by the first inspection mechanism and the second inspection mechanism, and finally wound on the active roller. The online visual inspection device for printing quality described in the present application has the advantages of high efficiency and saving consumables.

Description

Technical Field

[0001] The present application relates to the field of visual inspection technology, and in particular to an online visual inspection device and method for printing quality. Background Art

[0002] The existing label printing quality inspection technology is mainly divided into two types according to the inspection method. One is an online inspection system through online inspection, and the other is an offline inspection system through offline inspection. Regardless of which inspection method is used to inspect the printing quality of labels, it is a quality monitoring of the label printing process to effectively detect common defects such as blurry characters, missing prints, color differences, overprint deviations, dirty spots, ink spots, rough edges, die-cutting deviations, hot stamping deviations, and other special defects to ensure the quality of the finished label. Even after the inspection, the defective products can be eliminated to better ensure the reliability of the finished label.

[0003] Label paper usually has black text on a white background and is formed by inkjet printing. During the printing process, various unexpected defects may occur on the label paper due to the quality or process of the nozzle. Although the technology has been improved and the stability of hardware equipment has been improved, these defects still exist. At this time, the label paper needs to be inspected and removed.

[0004] The existing label printing quality control mainly relies on offline detection, which is widely used because of its low technical difficulty and easy implementation. However, the offline detection data is discontinuous with the subsequent stages, making it difficult to associate and trace the data. Online detection can associate and trace the data, making it easy to connect the data to the Internet.

[0005] In the online inspection and processing system of the prior art, when the label is inspected online, if the label paper is detected to be defective, it will be rewound during printing and discarded by spraying a grid, etc., to prevent the defective label paper from flowing into the subsequent process. Although this processing method ensures the quality of the finished label paper, it also has the problem that the same label paper needs to be printed twice due to rewinding, and the rewinding and delivery time caused by the rewinding of the label paper doubles, resulting in insufficient processing efficiency; even more, due to the increase in ink spraying, the amount of ink sprayed increases, and there is a problem of high consumables. Summary of the invention

[0006] Based on this, the purpose of the present application is to provide an online visual inspection device for printing quality, which has the advantages of ensuring inspection accuracy and improving processing efficiency.

[0007] In one aspect of the present application, there is provided an online visual inspection device for printing quality, comprising a winding mechanism, a first inspection mechanism, a second inspection mechanism, and a frame; the winding mechanism, the first inspection mechanism, and the second inspection mechanism are respectively mounted on the frame;

[0008] The winding mechanism comprises a driver, a driving roller, and a driven roller; the driver is rotationally connected to the driving roller and drives the driving roller to rotate;

[0009] The first detection mechanism includes a first visual camera unit, a first high-position spotlight, and a first annular frame; the first visual camera unit is installed at the center of the first annular frame, and the first high-position spotlight is installed on the bottom surface of the first annular frame;

[0010] The first detection mechanism is used to detect whether the label paper is qualified;

[0011] The second detection mechanism is used to detect whether the judgment on the unqualified label paper is correct, and if so, puncture the label paper; if not, change the judgment on the label paper to qualified;

[0012] The paper tape roll is sleeved on the driven roller, and is successively detected by the first detection mechanism and the second detection mechanism, and finally wound on the driving roller.

[0013] The online visual inspection device for printing quality described in the present application is a device that uses a winding mechanism to roll the paper tape on a driven roller through a first inspection mechanism and a second inspection mechanism in sequence, and finally winds it on an active roller. When passing through the inspection of the first inspection mechanism, since the spotlight is at a high position, the inclination angle of the first high-position spotlight is large, so that the light of the spotlight is fully irradiated on the label paper on the paper tape, so that the first visual camera unit can clearly capture the content on the label paper, thereby performing image analysis and processing through the visual system, and judging whether the content of the label paper is qualified. If the judgment result is qualified, it can be judged again at the second inspection mechanism, or it can be passed directly; if it is judged to be unqualified, it can be judged again at the second inspection mechanism; if the result of the judgment at the second inspection mechanism is unqualified, the label paper is punctured to obtain a label paper with physical defects. When detecting and judging the label paper, the present application does not rewind the paper tape roll, and the motor does not need to reverse, thereby shortening the time for judgment and processing and improving efficiency; secondly, there is no need to spray the scrapped images and texts on the label paper, and the consumption of consumables is almost zero, thereby saving costs. Compared with the existing technology, the present application is both efficient and low-cost, and even has higher detection accuracy.

[0014] Further, the second detection mechanism includes a second visual camera unit, a second high-position spotlight, a second low-position spotlight, a second high-position annular frame, a second low-position annular frame, and a puncturing assembly; the second visual camera unit is installed at the center of the second high-position annular frame, the second high-position spotlight is installed on the bottom surface of the second high-position annular frame, and the second low-position spotlight is installed on the bottom surface of the second low-position annular frame; the second low-position annular frame is placed below the second high-position annular frame; the puncturing assembly is placed below the second low-position annular frame;

[0015] The inclination angle of the second high-position spotlight is greater than the inclination angle of the second low-position spotlight;

[0016] The inclination angle of the first high-position spotlight is equal to the inclination angle of the second high-position spotlight;

[0017] A plurality of the first high-position spotlights are evenly distributed on the first annular frame, a plurality of the second high-position spotlights are evenly distributed on the second high-position annular frame, and a plurality of the second low-position spotlights are evenly distributed on the second low-position annular frame.

[0018] Furthermore, the first detection mechanism also includes a first tensioning roller and a first supporting bottom plate;

[0019] The first supporting bottom plate is placed below the first annular frame and is used to support the paper tape;

[0020] The two first tensioning rollers are respectively disposed on both sides of the first supporting bottom plate, and are used to tension the paper tape so that the paper tape is tensioned when passing through the first supporting bottom plate;

[0021] The second detection mechanism also includes a second tensioning roller and a second supporting bottom plate;

[0022] The second supporting bottom plate is placed below the second low-position annular frame and is used to support the paper tape;

[0023] The two second tensioning rollers are respectively disposed on both sides of the second supporting bottom plate, and are used to tension the paper tape so that the paper tape is tensioned when passing over the second supporting bottom plate;

[0024] The puncture assembly is installed below the second supporting base plate.

[0025] Furthermore, the winding mechanism further comprises a distance measuring sensor and a distance measuring support rod; the distance measuring sensor is mounted on the distance measuring support rod;

[0026] The infrared ray detected by the distance measuring sensor passes through the axis of the driven roller;

[0027] The distance measuring sensor is used to detect the thickness of the paper tape roll on the driven roller.

[0028] Furthermore, the puncture assembly is provided with a strip-shaped puncture opening; the length direction of the puncture opening is arranged along the moving direction of the paper tape;

[0029] The puncture assembly includes a puncture support rod, a cylinder, a cushion block, and a puncture head;

[0030] The cross section of the piercing support rod is in a "T" shape, and one end of the piercing support rod is fixed to the frame;

[0031] The cylinder is mounted on the puncturing support rod, the cushion block is mounted on the end of the piston rod of the cylinder; the puncturing head is mounted on the cushion block;

[0032] The end of the puncture head is in the form of a cone and is placed below the puncture opening.

[0033] Furthermore, the second detection mechanism also includes a second pressure roller, and two second pressure rollers are respectively placed above the second supporting bottom plate, and a gap is formed between the second pressure rollers and the second supporting bottom plate; the gap is used to ensure the passage of the paper tape.

[0034] Furthermore, the winding mechanism also includes a reducer and a collar; the driver is a speed-adjustable variable-frequency motor;

[0035] The speed-adjustable variable-frequency motor is connected to the active roller via the reducer;

[0036] The two sleeve rings are respectively sleeved on the active roller and the driven roller;

[0037] The distance value detected by the distance measuring sensor is positively correlated with the rotation speed of the speed-adjustable variable-frequency motor, so as to maintain the speed stability of the paper tape when it passes through the first detection mechanism.

[0038] Another aspect of the present application provides an online visual inspection method for printing quality, comprising the steps of:

[0039] An online visual inspection device for printing quality as described in any of the above schemes is provided;

[0040] Taking a picture of the label paper when the paper tape passes through the first detection mechanism, and analyzing whether the content displayed on the label paper is qualified;

[0041] If yes, the paper tape directly passes through the second detection mechanism and is wound around the active roller for winding;

[0042] If not, the machine stops when the label paper is located at the second detection mechanism, and the image of the label paper is photographed again by the second detection mechanism, and it is judged again whether the content displayed on the label paper is qualified. If yes, the judgment result of the label paper is corrected, and the machine is turned on to wind the paper tape on the active roller; if not, the label paper is punctured;

[0043] If the label paper is punctured, turn off the second high-position spotlight, turn on the second low-position spotlight, take a new image of the label paper through the second detection mechanism again, then start the machine and continue to reel in the paper tape roll.

[0044] Furthermore, the first high-position spotlight remains constantly lit;

[0045] When the second high-position spotlight is turned on, the second low-position spotlight remains off; when the second low-position spotlight is turned on, the second high-position spotlight remains off;

[0046] The inclination angle of the second high-position spotlight satisfies the relationship 60°≤b≤90°;

[0047] The inclination angle of the second low-position spotlight satisfies the relationship 15°≤a≤45°.

[0048] Furthermore, after the label paper is punctured, the diameter of the hole formed ranges from 2 to 20 mm;

[0049] When the first detection mechanism determines that the label paper is qualified, the second detection mechanism re-inspects the label paper; if the result of the re-inspection is qualified, the result is judged as qualified; if the result of the re-inspection is unqualified, the barcode number of the label paper is marked.

[0050] For better understanding and implementation, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the three-dimensional structure of an exemplary online visual inspection device for printing quality of the present application;

[0052] Figure 2 A schematic diagram of a three-dimensional structure of an exemplary online visual inspection device for printing quality of the present application from another perspective;

[0053] Figure 3 A schematic diagram of a three-dimensional structure of an exemplary online visual inspection device for printing quality of the present application from another perspective;

[0054] Figure 4 A front view of an exemplary online visual inspection device for printing quality of the present application;

[0055] Figure 5 This is a working principle diagram of a paper tape winding device for an exemplary online visual inspection of printing quality of the present application;

[0056] Figure 6 This is a schematic diagram of the three-dimensional structure of an exemplary puncture assembly of the present application;

[0057] Figure 7It is a three-dimensional structural schematic diagram of the assembly relationship of the second visual camera unit, the second high-position spotlight, the second low-position spotlight, the second high-position annular frame, and the second low-position annular frame exemplarily shown in the present application;

[0058] Figure 8 for Figure 7 a side view of the structure shown;

[0059] Fig. 9 This is a working principle diagram of an exemplary second detection mechanism of the present application;

[0060] Fig.10 A flowchart of an exemplary online visual inspection method for printing quality of the present application;

[0061] Fig.11 The following is a flow chart of another exemplary method for online visual inspection of printing quality in the present application. DETAILED DESCRIPTION

[0062] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0063] See also Figure 1-Figure 9 , an exemplary online visual inspection device for printing quality of the present application comprises a winding mechanism, a first inspection mechanism 30, a second inspection mechanism 50, and a frame; the winding mechanism, the first inspection mechanism 30, and the second inspection mechanism 50 are respectively mounted on the frame;

[0064] The winding mechanism includes a driver, a driving roller 21, and a driven roller 22; the driver is rotatably connected to the driving roller 21 and drives the driving roller 21 to rotate;

[0065] The first detection mechanism 30 includes a first visual camera unit 31, a first high-position spotlight, and a first annular frame 32; the first visual camera unit 31 is installed at the center of the first annular frame 32, and the first high-position spotlight is installed on the bottom surface of the first annular frame 32;

[0066] The first detection mechanism 30 is used to detect whether the label paper is qualified;

[0067] The second detection mechanism 50 is used to detect whether the judgment on the unqualified label paper is correct. If so, the label paper is punctured; if not, the label paper is judged as qualified.

[0068] The paper tape roll is sleeved on the driven roller 22 , and is successively detected by the first detection mechanism 30 and the second detection mechanism 50 , and is finally wound on the driving roller 21 .

[0069] The online visual inspection device for printing quality described in the present application, through the winding mechanism, rolls the paper tape on the driven roller 22 through the first inspection mechanism 30 and the second inspection mechanism 50 in sequence, and finally rolls it on the active roller 21. When passing through the inspection of the first inspection mechanism 30, since the spotlight is in a high position, the inclination angle of the first high-position spotlight is large, so that the light of the spotlight is fully irradiated on the label paper on the paper tape B, and then the first visual camera unit 31 can clearly capture the content on the label paper, so that the image analysis and processing are performed through the visual system, and it is determined whether the content of the label paper is qualified. If the judgment result is qualified, it can be judged again at the second inspection mechanism 50, or it can be passed directly; if it is judged to be unqualified, it is judged again at the second inspection mechanism 50; if the result of the judgment at the second inspection mechanism 50 is unqualified, the label paper is punctured to obtain a label paper with physical defects. When detecting and judging the label paper, the present application does not rewind the paper tape roll, and the motor does not need to reverse, thereby shortening the time for judgment and processing and improving efficiency; secondly, there is no need to spray the scrapped images and texts on the label paper, and the consumption of consumables is almost zero, thereby saving costs. Compared with the existing technology, the present application is both efficient and low-cost, and even has higher detection accuracy.

[0070] In some preferred embodiments, the rack includes a frame body and a shell 10, and the shell 10 is installed and wrapped around the frame body. Figure 2-5 What is shown in FIG. 1 is the side plate 11 of the housing 10 .

[0071] In some preferred embodiments, the second detection mechanism 50 includes a second visual camera unit 58, a second high-position spotlight 52, a second low-position spotlight 54, a second high-position annular frame 51, a second low-position annular frame 53, and a puncturing assembly; the second visual camera unit 58 is installed at the center of the second high-position annular frame 51, the second high-position spotlight 52 is installed on the bottom surface of the second high-position annular frame 51, and the second low-position spotlight 54 is installed on the bottom surface of the second low-position annular frame 53; the second low-position annular frame 53 is placed below the second high-position annular frame 51; the puncturing assembly is placed below the second low-position annular frame 53;

[0072] The inclination angle of the second high-position spotlight 52 is greater than the inclination angle of the second low-position spotlight 54;

[0073] The inclination angle of the first high-position spotlight is equal to the inclination angle of the second high-position spotlight 52;

[0074] The plurality of first high-position spotlights are evenly distributed on the first annular frame 32 , the plurality of second high-position spotlights 52 are evenly distributed on the second high-position annular frame 51 , and the plurality of second low-position spotlights 54 are evenly distributed on the second low-position annular frame 53 .

[0075] In some preferred embodiments, the first visual camera unit 31 and the second visual camera unit 58 use the same camera, the first high-position spotlight and the second high-position spotlight 52 use the same structure; the first high-position spotlight and the first ring frame 32 are assembled in the same manner as the second high-position spotlight 52 and the second high-position ring frame 51. Therefore, the structure of the first detection mechanism 30 can refer to the assembly method of the second visual camera unit 58, the second high-position spotlight 52, and the second high-position ring frame 51 and the examples shown in the accompanying drawings. The working principle of the first detection mechanism 30 can refer to the attached Fig. 9 The working principle of the second high position spotlight 52.

[0076] In some preferred embodiments, the inclination angle of the second high-position spotlight satisfies the relationship 60°≤b≤90°; at the same time, the inclination angle of the first high-position spotlight also satisfies the relationship 60°≤c≤90°;

[0077] The inclination angle of the second low-positioned spotlight 54 satisfies the relationship of 15°≤a≤45°.

[0078] In the present application, a represents the inclination angle of the second low-position spotlight 54, b represents the inclination angle of the second high-position spotlight, and c represents the inclination angle of the first high-position spotlight.

[0079] In a preferred embodiment, a is 30°, b is 75°, and c is 75°. In another preferred embodiment, a is 25°, b is 65°, and c is 70°.

[0080] In some preferred embodiments, the number of the first high-positioned spotlights is the same as the number of the second high-positioned spotlights.

[0081] In this application, the inclination angle of a spotlight refers to the inclination angle of the central axis of the spotlight beam relative to the horizontal plane. Fig. 9As shown, since the paper tape moves along the first supporting bottom plate 34, and the first supporting bottom plate 34 can be considered to be in a horizontal position, it can be understood that the inclination angle of the spotlight is the inclination angle relative to the first supporting bottom plate. The larger the inclination angle, the more vertical the light shining downward, and the smaller the inclination angle, the more horizontal the light. Based on this feature, when a high-position spotlight shines on the label paper on the paper tape, its reflected light can fully enter the visual camera unit, so that the image captured by the visual camera unit is the graphic information on the label paper. When a low-position spotlight shines on the label paper, what is reflected into the visual camera unit is more of the outline of the label paper, and the graphic on the label paper cannot be well captured. At this time, it is used to obtain the outline and hole information of the label paper.

[0082] In some preferred embodiments, the first detection mechanism 30 further includes a first tensioning roller 33 and a first supporting bottom plate 34;

[0083] The first supporting bottom plate 34 is placed below the first annular frame 32 and is used to support the paper tape B;

[0084] The two first tensioning rollers 33 are respectively disposed on both sides of the first supporting bottom plate 34 and are used to tension the paper tape B so that the paper tape B is tensioned when passing through the first supporting bottom plate 34;

[0085] The second detection mechanism 50 further includes a second tensioning roller 55 and a second supporting bottom plate 56;

[0086] The second supporting bottom plate 56 is placed below the second low-position annular frame 53 and is used to support the paper tape B;

[0087] The two second tensioning rollers 55 are respectively disposed on both sides of the second supporting bottom plate 56, and are used to tension the paper tape B so that the paper tape B is tensioned when passing through the second supporting bottom plate 56;

[0088] The puncture assembly is installed below the second supporting base plate 56.

[0089] The two first tensioning rollers 33 tension the paper tape passing through the first detection mechanism from both ends to ensure that the paper tape is flat when passing through the first detection mechanism; the two second tensioning rollers 55 tension the paper tape passing through the second detection mechanism from both ends to ensure that the paper tape is flat when passing through the second detection mechanism.

[0090] In some preferred embodiments, the winding mechanism further includes a distance sensor 41 and a distance support rod 42; the distance sensor 41 is mounted on the distance support rod 42;

[0091] The infrared rays detected by the distance measuring sensor 41 pass through the axis of the driven roller 22;

[0092] The distance measuring sensor 41 is used to detect the thickness of the paper tape roll on the driven roller 22 .

[0093] According to the linear velocity calculation formula v=ωr, v represents the linear velocity, ω represents the angular velocity, and r represents the circumferential radius; when v is constant, if r changes, then ω needs to change accordingly, and r is negatively correlated with ω. The value of r is calculated based on the value obtained by the distance sensor 41. Since the distance between the distance sensor 41 and the axis of the driven shaft is a constant, the distance minus the value obtained by the distance sensor 41 is the radius r of the paper tape roll on the driven shaft. ω is indirectly realized by controlling the speed of the driver. Specifically, the angular velocity ω of the driven roller is calculated based on the value obtained by the encoder, and then the speed of the driver is changed to change the speed of the active roller to maintain the linear velocity of the paper tape, and the radius of the paper tape roll on the driven roller will change, thereby realizing the change of the speed of ω. The change of the value of ω is negatively fed back to the driver. If the speed of the driver is too large, the linear velocity is too large, and the driver needs to be decelerated; if the speed of the driver is too small, the linear velocity is too small, and the driver needs to be accelerated. Since the change of r is relatively stable, if the change of ω is too large, the linear speed will increase, and the drive will need to be slowed down, thus forming a negative feedback.

[0094] In addition, the constant linear speed of the paper tape conveyance can be achieved by means of a speed-controlled variable-frequency motor, which can also be achieved by means of existing technology.

[0095] In some preferred embodiments, the puncturing assembly is provided with a strip-shaped puncturing opening A; the length direction of the puncturing opening A is arranged along the moving direction of the paper tape B;

[0096] The puncture assembly includes a puncture support rod 64, a cylinder 61, a cushion block 62, and a puncture head 63;

[0097] The piercing support rod 64 has a "T"-shaped cross section, and one end thereof is fixed to the frame;

[0098] The cylinder 61 is mounted on the piercing support rod 64, and the cushion block 62 is mounted on the end of the piston rod of the cylinder 61; the piercing head 63 is mounted on the cushion block 62;

[0099] The end of the puncture head 63 is in the shape of a cone and is placed below the puncture opening A.

[0100] In some preferred embodiments, the second detection mechanism 50 also includes a second pressure roller 57, and two second pressure rollers 57 are respectively placed above the second supporting bottom plate 56, and a gap is formed between the second pressure rollers 57 and the second supporting bottom plate 56; the gap is used to ensure that the paper tape B passes through.

[0101] The piercing head of the piercing assembly rises and pierces the label paper, and at least one hole is formed on the label paper.

[0102] In some preferred embodiments, the winding mechanism further includes a reducer 23 and a collar 24; the driver is a speed-adjustable variable-frequency motor;

[0103] The speed-adjustable variable-frequency motor is connected to the active roller 21 via the reducer 23;

[0104] The two sleeve rings 24 are respectively sleeved on the active roller 21 and the driven roller 22;

[0105] The distance value detected by the distance measuring sensor 41 is positively correlated with the rotation speed of the variable-frequency motor, so as to maintain the speed stability of the paper tape B when passing through the first detection mechanism 30 .

[0106] The sleeve ring is used to be sleeved on the active roller and the driven roller to limit the winding position of the paper tape roll to ensure that when the paper tape roll is placed, the paper tape passes through the center of the first detection mechanism and the center of the second detection mechanism.

[0107] In some preferred embodiments, the winding mechanism further includes an encoder, which is rotationally connected to the driven roller and is used to read the rotation distance of the driven roller and calculate the angular velocity ω of the driven roller based on the rotation distance.

[0108] In the example shown in the figure, in order to ensure the tensioning effect of the first detection mechanism and the second detection mechanism on the paper tape respectively, the two first tensioning rollers are located at different height positions, and the two second tensioning rollers are located at different height positions, such as Figure 1-Figure 5 As shown, especially with reference to Figure 4 and Figure 5 shown.

[0109] The winding mechanism, the first detection mechanism 30, and the second detection mechanism 50 are electrically connected to the controller respectively; the controller is the master control, controls the movement of each electrical component, and obtains the data of each electrical component. The electrical components include a driver, a first high-position spotlight, a second high-position spotlight, a second low-position spotlight, a first visual camera unit, a second visual camera unit, a distance sensor, an encoder, etc.

[0110] In some preferred embodiments, a communication module and a cloud server are also provided, the controller is connected to the communication module, and the communication module transmits data to the cloud server to provide users with online information about the operating status.

[0111] In addition, online control can be achieved through the controller, and remote online control can be achieved when combined with the communication module.

[0112] The working principle of the online visual inspection device for printing quality in this application is briefly described as follows:

[0113] The paper tape is wound around the driven roller, then passes around the first detection mechanism and the second detection mechanism in sequence, and finally is wound around the active roller. The driver drives the active roller to rotate, and then drives the driven roller to rotate through the paper tape.

[0114] When the paper tape passes through the first detection mechanism, the label paper on the paper tape faces upward, and then the information on the label paper is photographed by the first visual camera unit. Since the first high-position spotlight is constantly on, the paper tape can pass through the first detection mechanism continuously and at high speed without affecting the shooting of the first visual camera unit. At the same time, the second high-position spotlight is also constantly on, so the paper tape passes through the second detection mechanism at high speed without affecting the shooting of the second visual camera unit. When the second high-position spotlight is on, the second low-position spotlight is off; when the second low-position spotlight is on, the second high-position spotlight is off.

[0115] Therefore, the online visual inspection device of the present application provides at least three working states:

[0116] The first detection mechanism performs a first defect detection, and the second detection mechanism performs a second defect detection.

[0117] State 1, qualified for the first time, qualified or unqualified for the second time. At this time, the first high-position spotlight and the second high-position spotlight are always on. If the first detection mechanism detects that the label paper is qualified, the driver continues to run and the first detection mechanism continues to detect; the label paper is continuously detected again at the second detection mechanism, regardless of whether the detection result at the second detection mechanism is qualified. If the second detection mechanism also detects that it is qualified, the label paper is marked as qualified, because each label paper has a barcode or QR code, so the serial number of the label paper can be determined by identifying the barcode or QR code of the label paper. If the detection result of the second detection mechanism is unqualified, the label paper is marked as pending and needs to be re-inspected. During the second re-inspection, the paper tape roll is re-installed and tested according to the above steps.

[0118] State 2: The first test is unqualified, and the second test is qualified. If the first test is unqualified, when the label paper is transported to the bottom of the camera unit of the second detection mechanism, the machine will stop, and the label paper is directly below the camera unit (this technical solution can be implemented by existing technology and will not be described in detail here); if the second detection mechanism detects it and it is qualified, the machine will start and run at the speed before the shutdown, marking the label paper as pending and requiring a second re-inspection.

[0119] State 3, the first test is unqualified, and the second test is unqualified. When both tests are unqualified, the puncture component is started to puncture the label paper and then reset, so that the label paper has a hole. At this time, the driver is in the shutdown state, the second high-position spotlight is turned off, the second low-position spotlight is turned on, the outline of the label paper with holes is photographed and obtained, and it is identified to determine whether there are holes. If so, the machine is turned on and started at the speed before shutdown; if not, the puncture component punctures the label paper again, and then the puncture component is reset; after that, the driver is started, the second low-position spotlight is turned off, and the second high-position spotlight is turned on.

[0120] The online visual inspection device of the present application realizes automatic operation and online control throughout the entire process, and the processing of defective label paper is efficient and time-saving, and no consumables are required, and the entire process is efficient and low-cost. In addition, the combination of two detection mechanisms has high detection accuracy and avoids the occurrence of misoperation.

[0121] See also Fig.10 and Fig.11 , an exemplary online visual inspection method for printing quality of the present application comprises the steps of:

[0122] S10, setting an online visual inspection device for printing quality as described in any of the above solutions;

[0123] S20, photographing the label paper image when the paper tape B passes through the first detection mechanism 30, and analyzing whether the content displayed on the label paper is qualified;

[0124] S21, if yes, the paper tape B directly passes through the second detection mechanism 50 and is wound around the active roller 21 to be wound;

[0125] S22, if not, then when the label paper is located at the second detection mechanism 50, the machine stops, the image of the label paper is photographed again by the second detection mechanism 50, and it is determined again whether the content displayed on the label paper is qualified;

[0126] S31, if yes, correct the judgment result of the label paper, start the machine to wind the paper tape B around the active roller 21;

[0127] S32, if not, puncture the label paper;

[0128] S40, if the label paper is punctured, turn off the second high-position spotlight 52, turn on the second low-position spotlight 54, take a new image of the label paper through the second detection mechanism 50 again, then start the machine and continue to reel in the paper tape roll.

[0129] In some preferred embodiments, the first high-position spotlight remains always on;

[0130] When the second high-position spotlight 52 is turned on, the second low-position spotlight 54 remains off; when the second low-position spotlight 54 is turned on, the second high-position spotlight 52 remains off;

[0131] The inclination angle of the second high-position spotlight satisfies the relationship 60°≤b≤90°;

[0132] The inclination angle of the second low-positioned spotlight 54 satisfies the relationship of 15°≤a≤45°.

[0133] In some preferred embodiments, after the label paper is punctured, the diameter of the hole formed ranges from 2 to 20 mm;

[0134] When the first detection mechanism 30 detects that the label paper is qualified, the second detection mechanism 50 re-inspects the label paper; if the result of the re-inspection is qualified, the result is judged as qualified; if the result of the re-inspection is unqualified, the barcode number of the label paper is marked.

[0135] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. An online visual inspection device for printing quality, characterized in that: It includes a winding mechanism, a first detection mechanism, a second detection mechanism, and a frame; the winding mechanism, the first detection mechanism, and the second detection mechanism are respectively installed on the frame; The winding mechanism comprises a driver, a driving roller, and a driven roller; the driver is rotationally connected to the driving roller and drives the driving roller to rotate; The first detection mechanism includes a first visual camera unit, a first high-position spotlight, and a first annular frame; the first visual camera unit is installed at the center of the first annular frame, and the first high-position spotlight is installed on the bottom surface of the first annular frame; The first detection mechanism is used to detect whether the label paper is qualified; The second detection mechanism is used to detect whether the judgment on the unqualified label paper is correct, and if so, puncture the label paper; if not, change the judgment on the label paper to qualified; The paper tape roll is sleeved on the driven roller, and is successively detected by the first detection mechanism and the second detection mechanism, and finally wound on the driving roller; The second detection mechanism includes a second visual camera unit, a second high-position spotlight, a second low-position spotlight, a second high-position annular frame, a second low-position annular frame, and a puncturing assembly; the second visual camera unit is installed at the center of the second high-position annular frame, the second high-position spotlight is installed on the bottom surface of the second high-position annular frame, and the second low-position spotlight is installed on the bottom surface of the second low-position annular frame; the second low-position annular frame is placed below the second high-position annular frame; the puncturing assembly is placed below the second low-position annular frame; The inclination angle of the second high-position spotlight is greater than the inclination angle of the second low-position spotlight; The inclination angle of the first high-position spotlight is equal to the inclination angle of the second high-position spotlight; A plurality of the first high-position spotlights are evenly distributed on the first annular frame, a plurality of the second high-position spotlights are evenly distributed on the second high-position annular frame, and a plurality of the second low-position spotlights are evenly distributed on the second low-position annular frame; The inclination angle of the second high-position spotlight satisfies the relationship 60°≤b≤90°; the inclination angle of the first high-position spotlight also satisfies the relationship 60°≤c≤90°; The inclination angle of the second low-position spotlight satisfies the relationship 15°≤a≤45°.

2. The on-line visual inspection device for printing quality according to claim 1, characterized in that: The first detection mechanism also includes a first tensioning roller and a first supporting bottom plate; The first supporting bottom plate is placed below the first annular frame and is used to support the paper tape; The two first tensioning rollers are respectively disposed on both sides of the first supporting bottom plate, and are used to tension the paper tape so that the paper tape is tensioned when passing over the first supporting bottom plate; The second detection mechanism also includes a second tensioning roller and a second supporting bottom plate; The second supporting bottom plate is placed below the second low-position annular frame and is used to support the paper tape; The two second tensioning rollers are respectively disposed on both sides of the second supporting bottom plate, and are used to tension the paper tape so that the paper tape is tensioned when passing over the second supporting bottom plate; The puncture assembly is installed below the second supporting base plate.

3. The on-line visual inspection device for printing quality according to claim 2, characterized in that: The winding mechanism further comprises a distance measuring sensor and a distance measuring support rod; the distance measuring sensor is mounted on the distance measuring support rod; The infrared ray detected by the distance measuring sensor passes through the axis of the driven roller; The distance measuring sensor is used to detect the thickness of the paper tape roll on the driven roller.

4. The on-line visual inspection device for printing quality according to claim 3, characterized in that: The puncture assembly is provided with a strip-shaped puncture opening; the length direction of the puncture opening is arranged along the moving direction of the paper tape; The puncture assembly includes a puncture support rod, a cylinder, a cushion block, and a puncture head; The cross section of the piercing support rod is in a "T" shape, and one end of the piercing support rod is fixed to the frame; The cylinder is mounted on the puncturing support rod, the cushion block is mounted on the end of the piston rod of the cylinder; the puncturing head is mounted on the cushion block; The end of the puncture head is in the form of a cone and is placed below the puncture opening.

5. The on-line visual inspection device for printing quality according to claim 2, characterized in that: The second detection mechanism also includes second pressure rollers. Two second pressure rollers are respectively placed above the second supporting bottom plate, and a gap is formed between the second pressure rollers and the second supporting bottom plate; the gap is used to ensure the passage of the paper tape.

6. The on-line visual inspection device for printing quality according to claim 3 or 4, characterized in that: The winding mechanism also includes a reducer and a collar; the driver is a speed-regulating variable-frequency motor; The speed-adjustable variable-frequency motor is connected to the active roller via the reducer; The two sleeve rings are respectively sleeved on the active roller and the driven roller; The distance value detected by the distance measuring sensor is positively correlated with the rotation speed of the speed-adjustable variable-frequency motor, so as to maintain the speed stability of the paper tape when it passes through the first detection mechanism.

7. A method for online visual inspection of printing quality, characterized in that: Includes steps: An online visual inspection device for printing quality as described in any one of claims 1 to 6 is provided; Taking a picture of the label paper when the paper tape passes through the first detection mechanism, and analyzing whether the content displayed on the label paper is qualified; If yes, the paper tape directly passes through the second detection mechanism and is wound around the active roller for winding; If not, the machine stops when the label paper is located at the second detection mechanism, and the image of the label paper is photographed again by the second detection mechanism, and it is judged again whether the content displayed on the label paper is qualified. If yes, the judgment result of the label paper is corrected, and the machine is turned on to wind the paper tape on the active roller; if not, the label paper is punctured; If the label paper is punctured, turn off the second high-position spotlight, turn on the second low-position spotlight, take a new image of the label paper through the second detection mechanism again, then start the machine and continue to reel in the paper tape roll.

8. The method for online visual inspection of printing quality according to claim 7, characterized in that: The first high-position spotlight remains on; When the second high position spotlight is turned on, the second low position spotlight remains off; when the second low position spotlight is turned on, the second high position spotlight remains off.

9. The method for online visual inspection of printing quality according to claim 7, characterized in that: After the label paper is punctured, the diameter of the hole formed ranges from 2 to 20 mm; When the first detection mechanism determines that the label paper is qualified, the second detection mechanism re-inspects the label paper; if the result of the re-inspection is qualified, the result is judged as qualified; if the result of the re-inspection is unqualified, the barcode number of the label paper is marked.

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