A printed matter defect detection device

Abstract

The application relates to a printed matter defect detection device, belonging to the field of printed matter detection, which comprises a rack, a feeding mechanism, a back plate, a pressing mechanism, a reversing mechanism and a detection mechanism. The feeding mechanism is arranged on the rack and is used for feeding double-sided printed matters to be detected and discharging double-sided printed matters after detection. The back plate is arranged on the rack and is used for abutting against one side of the double-sided printed matters away from a detection surface. The pressing mechanism is arranged on the rack and is used for pressing the double-sided printed matters on the back plate. The reversing mechanism is arranged on the rack and is used for driving the detection surface of the double-sided printed matters to be converted. The detection mechanism is arranged on the rack and is used for detecting defects of the double-sided printed matters attached to the back plate. The application has the effects of reducing the shadow of the pattern and text on one side of the double-sided printed matters away from the detection surface due to reflection and improving the accuracy of detecting defects of the double-sided printed matters.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printed matter detection, and in particular to a printed matter defect detection device. BACKGROUND

[0002] During the production of printed matter, defects such as uneven ink, missing printing, scratches, stains, etc. are prone to occur. Therefore, with the continuous improvement of market requirements for the quality of printed matter, the importance of printed matter defect detection is increasingly prominent.

[0003] At present, the existing printed matter defect detection mainly adopts a visual detection method, which scans the image of the printed matter through a camera, and then compares the scanned image with a set standard image, so as to achieve the purpose of printed matter defect detection.

[0004] However, when detecting the defects of double-sided printed matter, since the two sides of the printed matter are printed with patterns and characters, under the illumination of light, the patterns and characters on the other side of the printed matter are easy to produce shadows to the side being detected, thereby affecting the accuracy of detecting the printed matter. SUMMARY

[0005] In order to improve the accuracy of detecting the defects of double-sided printed matter, the present application provides a printed matter defect detection device.

[0006] The printed matter defect detection device provided by the present application adopts the following technical solution:

[0007] A printed matter defect detection device, comprising a rack, a feeding mechanism, a back plate, a pressing mechanism, a reversing mechanism and a detection mechanism, the feeding mechanism is arranged on the rack and is used for feeding double-sided printed matter to be detected and discharging double-sided printed matter after detection, the back plate is provided with at least two on the rack and is used for abutting against one side of the double-sided printed matter away from the detection surface, the pressing mechanism is arranged on the rack and is used for pressing the double-sided printed matter on the back plate, the reversing mechanism is arranged on the rack and is used for driving the detection surface of the double-sided printed matter to switch, and the detection mechanism is arranged on the rack and is used for detecting the defects of the double-sided printed matter adhered to the back plate.

[0008] By adopting the technical scheme, the feeding mechanism feeds the produced double-sided printed matter to be detected, the pressing mechanism presses the double-sided printed matter to the backboard, so that the side of the double-sided printed matter away from the detection surface is attached to the backboard, then the detection mechanism detects the defects of the part of the double-sided printed matter attached to the backboard, the reversing mechanism reverses the double-sided printed matter on one side of which the detection is completed, the pressing mechanism presses the other side of the double-sided printed matter to the other backboard, the detection mechanism detects the other side of the double-sided printed matter, and finally the feeding mechanism discharges the double-sided printed matter of which the detection is completed, so that the detection of the defects of both sides of the double-sided printed matter is completed. During the detection, the side of the double-sided printed matter away from the detection surface is attached to the backboard, so that the shadow of the pattern and text of the side of the double-sided printed matter away from the detection surface due to reflection is reduced, and the accuracy of detecting the defects of the double-sided printed matter is improved.

[0009] Optionally, the pressing mechanism comprises a pressing seat, pressing rollers, a control member and a width-limiting assembly. The pressing seat is slidingly arranged on the rack in a direction towards the backboard. Two pressing rollers are rotationally arranged on the pressing seat in the conveying direction of the double-sided printed matter. The control member is arranged on the rack and is used to drive the pressing seat to slide. The width-limiting assembly is arranged on the rack and is used to limit the displacement of the double-sided printed matter in the length direction of the pressing roller.

[0010] By adopting the technical scheme, the displacement of the double-sided printed matter in the length direction of the pressing roller is limited by the width-limiting assembly, and the pressing seat drives the pressing rollers to move towards the backboard by the control member, so that the double-sided printed matter is stably abutted to the backboard for conveying, and the possibility of the shadow of the double-sided printed matter due to the gap between the double-sided printed matter and the backboard is reduced.

[0011] Optionally, the width-limiting assembly comprises a sliding seat, a roller and a driving member. The sliding seat is slidingly arranged on the rack in the length direction of the pressing roller. The roller is rotationally arranged on the sliding seat and abuts against the double-sided printed matter on the backboard. The driving member is arranged on the rack and is used to drive the sliding seat to slide.

[0012] By adopting the technical scheme, the driving member drives the sliding seat to move towards the side edge of the double-sided printed matter, and the sliding seat drives the roller to press the side edge of the double-sided printed matter, so that the stability of the double-sided printed matter attached to the backboard is further improved, and the possibility of the edge of the double-sided printed matter being warped on the backboard is reduced.

[0013] Optionally, the reversing mechanism comprises a plurality of guide rollers. The plurality of guide rollers are rotationally arranged on the rack. The plurality of guide rollers are used to drive the conveying direction of the double-sided printed matter to reverse.

[0014] By adopting the technical scheme, after one side of the double-sided printed matter is detected, the multiple guide rollers guide the continuous conveying of the double-sided printed matter, so that the conveying direction of the double-sided printed matter is reversed, and the face to be detected of the double-sided printed matter is switched.

[0015] Optionally, the detection mechanism comprises an adjusting seat, a detection seat, a camera module, a first control member, a second control member, a third control member and a light assembly. The adjusting seat is slidingly arranged on the rack in a direction towards the back plate. The detection seat is slidingly arranged on the adjusting seat in a direction towards the conveying direction of the double-sided printed matter. The camera module is slidingly arranged on the detection seat in a direction perpendicular to the sliding direction of the detection seat. The first control member is arranged on the rack and is used to drive the adjusting seat to slide. The second control member is arranged on the adjusting seat and is used to drive the detection seat to slide. The third control member is arranged on the detection seat and is used to drive the camera module to slide. The light assembly is arranged on the camera module and is used to illuminate the detection area of the double-sided printed matter.

[0016] By adopting the technical scheme, according to the width and thickness of the double-sided printed matter to be detected, the first control member drives the adjusting seat to slide, the second control member drives the detection seat to slide, and the third control member drives the camera module to slide, so that the distance between the camera module and the double-sided printed matter and the central position of the camera module facing the double-sided printed matter are adjusted. The camera module is adjusted to a better detection position, and the light assembly illuminates the detection area of the double-sided printed matter, improving the imaging effect of the camera module and the accuracy of defect detection of the double-sided printed matter.

[0017] Optionally, the light assembly comprises a first support rod, a second support rod, a light, a first adjusting member and a second adjusting member. The first support rod and the second support rod are slidingly arranged in two in opposite directions on the camera module. The sliding direction of the second support rod is perpendicular to the sliding direction of the first support rod. The first adjusting member is arranged on the camera module and is used to drive the two first support rods to slide. The second adjusting member is arranged on the camera module and is used to drive the two second support rods to slide. The light is arranged on each first support rod and second support rod.

[0018] By adopting the technical scheme, according to the width size and the photographing imaging size of the double-sided printed matter to be detected, the position of the camera module is adjusted, the light assembly is driven to move, then the first adjusting member drives the two first supporting frames to move close to or away from each other, the second adjusting member drives the two second supporting rods to move close to or away from each other, and then the area surrounded by the two first supporting rods and the two second supporting rods is adjusted to be adapted to the width size and the photographing imaging size of the double-sided printed matter, and the lamps on the first supporting rods and the lamps on the second supporting rods can illuminate the double-sided printed matter according to the width size and the photographing imaging size of the double-sided printed matter, thereby improving the illumination effect of the double-sided printed matter.

[0019] Optionally, the feeding mechanism comprises a feeding frame, a feeding roller, a discharging roller, a locking piece and a winding piece, the feeding frame is rotationally arranged on the rack, a plurality of the feeding rollers are rotationally arranged on the feeding frame in a circumferential direction at intervals, a plurality of the discharging rollers are rotationally arranged on the feeding frame in a circumferential direction at intervals, the plurality of the feeding rollers and the plurality of the discharging rollers are symmetrically arranged on the feeding frame, the locking piece is arranged on the rack and is used for locking the feeding frame, and the winding piece is arranged on the rack and is used for driving the discharging roller to rotate after winding the double-sided printed matter.

[0020] By adopting the technical scheme, the worker sets the plurality of wound double-sided printed matters to be detected on the plurality of feeding rollers respectively, then rotates the feeding frame to make one of the feeding rollers rotate to the feeding position, locks the feeding frame by the locking piece, drags the double-sided printed matter on the feeding roller from the detection conveying path to the discharging roller supported by the feeding roller, drives the discharging roller to rotate by the winding piece, and the discharging roller can pull the double-sided printed matter to convey, so as to conveniently realize the feeding and discharging of the double-sided printed matter, and when the feeding of the wound double-sided printed matter on one of the feeding rollers is completed, the locking piece is unlocked, then the feeding frame is rotated to make another feeding roller with the wound double-sided printed matter rotate to the feeding position, and then the locking piece is locked, so as to realize the quick switching of the feeding roller and the discharging roller and the quick switching of the double-sided printed matter.

[0021] Optionally, the winding piece comprises a winding motor and a shaft coupling, the winding motor is arranged on the rack, and the shaft coupling is arranged on the output shaft of the winding motor and is used for coaxially connecting to the discharging roller.

[0022] By adopting the technical scheme, after the feeding frame drives the discharging roller to rotate to the discharging position, the output shaft of the winding motor is coaxially connected to the discharging roller through the shaft coupling, the winding motor is started, and the discharging roller is driven to rotate to wind the double-sided printed matter.

[0023] Optionally, the rack is provided with a marking mechanism for marking the defective part of the double-sided printed matter, the marking mechanism comprising a marking seat, a spray gun, a pushing member and a cutting assembly, the marking seat being obliquely arranged on the rack along the conveying direction of the double-sided printed matter, the spray gun being arranged on the marking seat and used for marking the defective part of the printed matter, the pushing member being arranged on the rack and used for pushing the marking seat to slide, and the cutting assembly being arranged on the rack and used for cutting the defective part of the double-sided printed matter before being wound to the unloading roller.

[0024] By adopting the above technical scheme, after the camera module detects the defective double-sided printed matter, the spray gun marks the double-sided printed matter, the pushing member drives the marking seat to slide, the marking seat drives the spray gun to move, the spray gun moves obliquely to adapt to the conveying of the double-sided printed matter, the spray gun can spray a cutting line on the double-sided printed matter, and the subsequent cutting assembly can cut the defective part of the double-sided printed matter along the cutting line sprayed by the spray gun before being wound to the unloading roller, so that the defective treatment of the double-sided printed matter is conveniently realized.

[0025] Optionally, the cutting assembly comprises an identification camera, a cutter, a cutting member and a control panel, the identification camera is arranged on the rack in at least two, the two identification cameras are respectively located on the two sides of the double-sided printed matter, the cutter is slidably arranged on the rack along the direction towards the width direction of the double-sided printed matter, the cutting member is arranged on the rack and used for driving the cutter to slide, and the control panel is arranged on the rack and electrically connected with the identification camera, the cutting member and the winding motor.

[0026] By adopting the above technical scheme, after the identification camera identifies the cutting line sprayed by the spray gun, the control panel controls the winding motor to stop and controls the cutting member to drive the cutter to slide towards the direction of the width direction of the double-sided printed matter, so that the cutter can cut the double-sided printed matter along the cutting line.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. Reducing the shadow of the pattern and text on the side of the double-sided printed matter away from the detection surface due to reflection, improving the accuracy of detecting the defects of the double-sided printed matter;

[0029] 2. Adjusting the camera module to a better detection position, and illuminating the detection area of the double-sided printed matter by the light assembly, improving the imaging effect of the camera module, and further improving the accuracy of detecting the defects of the double-sided printed matter;

[0030] 3. When the feeding of the double-sided printed matter in the roll form on one of the feeding rollers is completed, the locking member is unlocked to lock the feeding frame, and then the feeding frame is rotated to rotate the other feeding roller provided with the double-sided printed matter in the roll form to the feeding position, and then the locking member is locked, so that the feeding roller and the discharging roller can be quickly switched, and the double-sided printed matter can be quickly fed and discharged. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a printed matter defect detection device according to an embodiment of the present application.

[0032] Figure 2 is a structural schematic diagram of a feeding mechanism according to an embodiment of the present application.

[0033] Figure 3 is a structural schematic diagram of a back plate, a pressing mechanism, a detection mechanism and a marking mechanism according to an embodiment of the present application.

[0034] Figure 4 is a structural schematic diagram of a pressing mechanism according to an embodiment of the present application.

[0035] Figure 5 is a structural schematic diagram of a detection mechanism according to an embodiment of the present application.

[0036] Figure 6 is a structural schematic diagram of a cutting assembly according to an embodiment of the present application.

[0037] Label: 1, rack; 2, feeding mechanism; 21, feeding frame; 22, feeding roller; 23, discharging roller; 24, locking member; 25, winding member; 251, winding motor; 252, shaft coupling; 3, back plate; 4, pressing mechanism; 41, pressing seat; 42, pressing roller; 43, control member; 44, width limiting assembly; 441, sliding seat; 442, roller; 443, driving member; 5, reversing mechanism; 51, guide roller; 6, detection mechanism; 61, adjusting seat; 62, detection seat; 63, camera module; 64, first control member; 65, second control member; 66, third control member; 67, light assembly; 671, first supporting rod; 672, second supporting rod; 673, spotlight; 674, first adjusting member; 675, second adjusting member; 7, marking mechanism; 71, marking seat; 72, spray gun; 73, pushing member; 74, cutting assembly; 741, identification camera; 742, cutter; 743, cutting member. DETAILED DESCRIPTION

[0038] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The present application will be further described in detail.

[0039] The present application discloses a printed matter defect detection device.

[0040] Reference will be made toFigure 1 The printed matter defect detection device comprises a rack 1, a feeding mechanism 2, a back plate 3, a pressing mechanism 4, a reversing mechanism 5, a detection mechanism 6 and a marking mechanism 7.

[0041] With reference to Figure 1 , Figure 2 The feeding mechanism 2 is installed on the rack 1, and is used for feeding the double-sided printed matter to be detected and discharging the double-sided printed matter after detection. The feeding mechanism 2 comprises a feeding frame 21, a plurality of feeding rollers 22, a plurality of discharging rollers 23, a locking piece 24 and a winding piece 25. The feeding frame 21 is rotatably installed on the rack 1. The plurality of feeding rollers 22 are rotatably installed on the feeding frame 21. The plurality of feeding rollers 22 are distributed at equal intervals in the circumferential direction of the feeding frame 21. The plurality of discharging rollers 23 are rotatably installed on the feeding frame 21. The plurality of discharging rollers 23 are distributed at equal intervals in the circumferential direction of the feeding frame 21. The plurality of feeding rollers 22 and the plurality of discharging rollers 23 are distributed at equal intervals in a staggered manner, so that the plurality of feeding rollers 22 and the plurality of discharging rollers 23 are symmetrically distributed on the feeding frame 21. In this embodiment, a plurality of notches for accommodating the feeding rollers 22 or the discharging rollers 23 are formed in the feeding frame 21. After the feeding rollers 22 or the discharging rollers 23 are accommodated in the notches, the locking bolts are threadedly installed on the feeding frame 21 at the notches, so that the feeding rollers 22 or the discharging rollers 23 are blocked in the notches. Thus, the feeding rollers 22 or the discharging rollers 23 can be conveniently installed on or removed from the feeding frame 21, and the feeding and discharging of the double-sided printed matter in the form of a roll on the feeding rollers 22 and the discharging rollers 23 can be conveniently performed.

[0042] With reference to Figure 2 The locking piece 24 is installed on the rack 1 and is used for locking the feeding frame 21. In this embodiment, the locking piece 24 is a locking pin. A plurality of insertion holes are formed in the rotation shaft of the feeding frame 21 at equal intervals in the circumferential direction of the feeding rollers 22. The locking pin is slidably installed on the rack 1. After the feeding frame 21 is rotated by an angle interval in the circumferential direction of the feeding rollers 22, the locking pin can be inserted into the opposite insertion hole at this time, so as to lock the rotation of the feeding frame 21. The winding piece 25 is installed on the rack 1 and is used for driving the discharging roller 23 for winding the double-sided printed matter after detection to rotate. The winding piece 25 comprises a winding motor 251 and a coupling 252. The winding motor 251 is installed on the rack 1. The coupling 252 is installed on the output shaft of the winding motor 251. The coupling 252 is coaxially connected with the discharging roller 23 for winding the double-sided printed matter after detection.

[0043] In this embodiment, a plurality of guide rollers are rotatably installed on the rack 1 along the conveying path of the double-sided printed matter, so as to support and guide the double-sided printed matter on the conveying path.

[0044] The worker sets the multiple finished roll double-sided printed matters one by one into the multiple feeding rollers 22 respectively, then pulls the double-sided printed matters to pass through the multiple guide rollers 51 in sequence along the subsequent detection conveying path, and then winds the double-sided printed matters to the discharging roller 23 connected with the coupling 252 at this time, starts the winding motor 251, and the winding motor 251 drives the discharging roller 23 to rotate through the coupling 252, so that the double-sided printed matters can be wound, thereby realizing the conveying of the double-sided printed matters on the detection conveying path, facilitating the feeding and discharging of the double-sided printed matters. When the feeding of the double-sided printed matters on the feeding roller 22 is completed, the locking of the feeding frame 21 by the locking piece 24 is released, the connection between the coupling 252 and the discharging roller 23 is disconnected, then the feeding frame 21 is rotated to make the feeding roller 22 sleeved with the roll double-sided printed matters rotate to the feeding position, the feeding frame 21 drives the other discharging roller 23 to rotate to the discharging position, then the feeding frame 21 is locked again by the locking piece 24, the coupling 252 is connected to the discharging roller 23 located at the discharging position at this time, and the switching of the feeding roller 22 at the feeding position and the discharging roller 23 at the discharging position can be conveniently realized. The winding motor 251 is started again, and the feeding, detection and discharging of the next roll double-sided printed matters can be realized, thereby improving the efficiency and convenience of switching the feeding and discharging of the double-sided printed matters.

[0045] With reference to Figure 1 , Figure 2 , the two back plates 3 are installed on the rack 1, and both of the two back plates 3 are located on the conveying path of the double-sided printed matters, and the two back plates 3 are respectively used for abutting to the two sides of the double-sided printed matters. In this embodiment, the two ends of the back plate 3 are rotatably installed with pulleys, so as to reduce the friction between the double-sided printed matters and the end of the back plate 3, and the back plate 3 is covered with a light-absorbing cloth, so as to reduce the reflection of light from the back plate 3.

[0046] With reference to Figure 1 , Figure 3 , Figure 4One pressing mechanism 4 is installed on each of the two back plates 3 on the frame 1. The pressing mechanism 4 is used to press the double-sided printed material onto the back plates 3. The pressing mechanism 4 includes a pressing seat 41, pressing rollers 42, a control component 43, and a width limiting component 44. The pressing seat 41 is slidably installed on the frame 1 along the direction facing the back plate 3 to adhere to the double-sided printed material. Two pressing rollers 42 are rotatably installed on the pressing seat 41. The length direction of the pressing rollers 42 is perpendicular to the conveying direction of the double-sided printed material. The two pressing rollers 42 are spaced apart along the conveying direction of the double-sided printed material. The control component 43 is installed on the frame 1 and is used to drive the pressing seat 41 to slide. In this embodiment, the control component 43 is a cylinder. The cylinder is installed on the frame 1, and the output shaft of the cylinder is connected to the pressing seat 41. The control component 43 controls the output shaft of the cylinder. The telescopic mechanism allows the pressure seat 41 to move closer to or away from the back plate 3. A width-limiting component 44 is mounted on the frame 1 and is used to limit the displacement of the double-sided printed material along the length of the pressure roller 42. The width-limiting component 44 includes a sliding seat 441, rollers 442, and a driving member 443. One sliding seat 441 is slidably mounted on the frame 1 at each end of the pressure roller 42 along its length. Multiple rollers 442 are rotatably mounted on the sliding seat 441, and the rotation direction of the rollers 442 is consistent with the conveying direction of the double-sided printed material. The driving member 443 is mounted on the frame 1 and is used to drive the sliding seat 441 to slide. In this embodiment, the driving member 443 is a cylinder, mounted on the frame 1, and the piston rod of the cylinder is connected to the sliding seat 441.

[0047] The operator first slides the sliding seat 441 of the drive component 443 according to the width of the double-sided printed material, so that the distance between the two sliding seats 441 is adapted to the width of the printed material. The sliding seat 441 can then drive the roller 442 to abut against the side of the double-sided printed material, thereby pressing the side of the double-sided printed material against the back plate 3, thus limiting the displacement of the double-sided printed material along the length direction of the pressure roller 42. At the same time, the control component 43 drives the pressure seat 41 to move towards the back plate 3. The pressure seat 41 drives the pressure roller 42 to move towards the back plate 3. The pressure roller 42 presses the double-sided printed material against the back plate 3, thus stably driving the double-sided printed material against the back plate 3 for conveying, maintaining the adhesion of the double-sided printed material on the back plate 3, reducing the possibility of shadows appearing on the double-sided printed material due to gaps between it and the back plate 3, and also reducing the possibility of the double-sided printed material curling up on the back plate 3.

[0048] Reference Figure 1 The reversing mechanism 5 is mounted on the frame 1. The reversing mechanism 5 is used to drive the detection surface of the double-sided printed matter to change. The reversing mechanism 5 includes multiple guide rollers 51. The multiple guide rollers 51 are used to guide the conveying direction of the double-sided printed matter to the reversing direction by allowing the double-sided printed matter to be wound around them.

[0049] One side of the double-sided printed matter is detected by the defect detection mechanism, and then the double-sided printed matter is guided by the plurality of guide rollers 51 to change the conveying direction, so that the detected side and the non-detected side of the double-sided printed matter are switched.

[0050] Referring to Figure 3 , Figure 5 , the detection mechanism 6 is installed on the rack 1, and is used for detecting defects of the double-sided printed matter attached to the back plate 3. The detection mechanism 6 includes an adjusting seat 61, a detection seat 62, a camera module 63, a first control member 64, a second control member 65, a third control member 66, and a light assembly 67. The adjusting seat 61 is slidingly installed on the rack 1 in a direction towards the back plate 3. The detection seat 62 is slidingly installed on the adjusting seat 61 in a direction towards the conveying direction of the double-sided printed matter. The camera module 63 is slidingly installed on the detection seat 62 in a direction perpendicular to the sliding direction of the detection seat 62. In this embodiment, the camera module 63 includes a collection module for capturing images, a processing module for processing the collected images, a detection module for comparing the processed images with a comparison template, and an output module for outputting the detection result in the form of an electrical signal. The first control member 64 is installed on the rack 1 and is used for driving the adjusting seat 61 to slide. The second control member 65 is installed on the adjusting seat 61 and is used for driving the detection seat 62 to slide. The third control member 66 is installed on the detection seat 62 and is used for driving the camera module 63 to slide. In this embodiment, the first control member 64, the second control member 65, and the third control member 66 are all air cylinders.

[0051] Referring to Figure 3 , Figure 5 , the light assembly 67 is installed on the camera module 63 and is used for illuminating the detection area of the double-sided printed matter. The light assembly 67 includes a first support rod 671, a second support rod 672, a light 673, a first adjusting member 674, and a second adjusting member 675. Two first support rods 671 are slidingly installed on the camera module 63 in parallel with each other. Two second support rods 672 are slidingly installed on the camera module 63 in a direction perpendicular to the sliding direction of the first support rods. The two second support rods are parallel to each other. The first adjusting member 674 is installed on the camera module 63 and is used for driving the two first support rods 671 to slide. The second adjusting member 675 is installed on the camera module 63 and is used for driving the two second support rods 672 to slide. In this embodiment, the first adjusting member 674 and the second adjusting member 675 are both air cylinders. One light 673 is installed on each of the first support rods 671 and the second support rods 672. In this embodiment, the light 673 is an LED lamp.

[0052] According to the width and thickness of the double-sided printed matter to be detected and the size of the image collected by the camera module 63 each time, the first control member 64 drives the adjusting seat 61 to drive the detection seat 62 and the camera module 63 to slide in the direction towards the back plate 3, the second control member 65 drives the detection seat 62 to drive the camera module 63 to slide in the direction of the conveying direction of the double-sided printed matter, and the third control member 66 drives the camera module 63 to slide in the direction perpendicular to the sliding direction of the detection seat 62, so as to adjust the distance between the camera module 63 and the double-sided printed matter and the central position of the camera module 63 facing the double-sided printed matter. The camera module 63 is adjusted to the optimal distance and position for collecting images of the double-sided printed matter on the back plate 3. At the same time, the camera module 63 drives the light assembly 67 to move, and the first adjusting member 674 drives the two first support frames to move close to or away from each other, and the second adjusting member 675 drives the two second support rods 672 to move close to or away from each other, so as to adjust the area surrounded by the two first support rods 671 and the two second support rods 672 to be adapted to the width size of the double-sided printed matter and the image collection size. The lamps 673 on the first support rods 671 and the lamps 673 on the second support rods 672 can illuminate the double-sided printed matter according to the width size of the double-sided printed matter and the image collection size, improve the imaging effect of the camera module 63, and further improve the accuracy of the defect detection of the double-sided printed matter.

[0053] With reference to Figure 1 , Figure 3 , Figure 6The marking mechanism 7 is installed on the rack 1, and the marking mechanism 7 is used for marking the defective part of the double-sided printed matter. The marking mechanism 7 comprises a marking seat 71, a spray gun 72, a pushing piece 73 and a cutting assembly 74. The marking seat 71 is obliquely slidably installed on the rack 1 along the conveying direction of the double-sided printed matter. The spray gun 72 is installed on the marking seat 71. The spray gun 72 is communicated with a pigment tank and is used for spraying the double-sided printed matter with marks under the action of an air compressor. The pushing piece 73 is installed on the rack 1 and is used for pushing the marking seat 71 to slide. The cutting assembly 74 is installed on the rack 1 and is used for cutting the double-sided printed matter sprayed with marks before being wound to the unloading roller 23. The cutting assembly 74 comprises two identification cameras 741, a cutter 742, a cutting piece 743 and a control panel. The two identification cameras 741 are installed on the rack 1 and are respectively located on the two sides of the double-sided printed matter before being wound to the unloading roller 23. The cutter 742 is slidably installed on the rack 1 along the direction towards the side edge of the double-sided printed matter. The cutting piece 743 is installed on the rack 1 and is used for driving the cutter 742 to slide. In this embodiment, the cutting piece 743 is a pneumatic cylinder. The control panel is installed on the rack 1 and is electrically connected with the identification cameras 741, the cutting piece 743, the winding motor 251, the camera module 63, the pushing piece 73 and the spray gun 72.

[0054] After the camera module 63 detects the double-sided printed matter with defects, an electrical signal is sent to the control panel. The control panel controls the spray gun 72 to start and controls the pushing piece 73 to push the marking seat 71 to slide. The marking seat 71 drives the spray gun 72 to obliquely slide along the conveying direction of the double-sided printed matter. The spray gun 72 can obliquely move along the conveying direction of the double-sided printed matter. Thus, the spray gun 72 can spray a cutting line on the double-sided printed matter along the width direction of the double-sided printed matter. This facilitates the cutter 742 to cut the defective part of the double-sided printed matter. When the defective section of the double-sided printed matter is continuously conveyed to the position of the identification camera 741, the identification camera 741 identifies the cutting line sprayed on the double-sided printed matter. The control panel controls the winding motor 251 to stop and controls the cutting piece 743 to start. The cutting piece 743 drives the cutter 742 to move from one side to the other side of the double-sided printed matter along the width direction of the double-sided printed matter. The cutter 742 can cut the defective section of the double-sided printed matter along the cutting line. This facilitates the processing of the defective section of the double-sided printed matter.

[0055] The implementation principle of the printing defect detection device is as follows: the double-sided printing on the roll on the feeding roller 22 is sequentially pulled through the back plate 3, the reversing mechanism 5, another back plate 3, and then wound onto the discharging roller 23. The discharging motor 251 drives the discharging roller 23 to rotate, so that the double-sided printing is pulled to move along the conveying path. The pressing mechanism 4 presses the double-sided printing on the back plate 3, so that the side of the double-sided printing away from the detection surface is attached to the back plate 3. The camera module 63 can compare and detect the images of the double-sided printing on the back plate 3. If there is a defect, the spray gun 72 can spray a separation line on the defect of the double-sided printing. The guide roller 51 guides the double-sided printing to the reverse direction, and the other pressing mechanism 4 presses the other side of the double-sided printing to the other back plate 3. The camera module 63 detects the other side of the double-sided printing. Then, the discharging roller 23 discharges the double-sided printing after detection. If the double-sided printing has a defect, the cutting assembly 74 cuts off the defect of the double-sided printing before the subsequent double-sided printing is wound onto the discharging roller 23. When the camera module 63 collects images, the double-sided printing is attached to the back plate 3, reducing the shadow of the pattern and text on the side of the double-sided printing away from the detection surface due to reflection, and improving the accuracy of detecting the defects of the double-sided printing.

[0056] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A printing defect detection device, characterized in that: The device includes a frame (1), a feeding mechanism (2), a back plate (3), a pressing mechanism (4), a reversing mechanism (5), and a detection mechanism (6). The feeding mechanism (2) is mounted on the frame (1) and is used to load the double-sided printed material to be inspected and unload the double-sided printed material after inspection. The back plate (3) is mounted on the frame (1) with at least two plates and is used to contact the side of the double-sided printed material away from the inspection surface. The pressing mechanism (4) is mounted on the frame (1) and is used to press the double-sided printed material onto the back plate (3). The reversing mechanism (5) is mounted on the frame (1) and is used to drive the inspection surface of the double-sided printed material to change. The detection mechanism (6) is mounted on the frame (1) and is used to perform defect detection on the double-sided printed material attached to the back plate (3). The detection mechanism (6) includes an adjustment seat (61), a detection seat (62), a camera module (63), a first control component (64), a second control component (65), a third control component (66), and a lighting assembly (67). The adjustment seat (61) is slidably mounted on the frame (1) in the direction toward the back plate (3). The detection seat (62) is slidably mounted on the adjustment seat (61) in the direction toward the conveying direction of the double-sided printed matter. The camera module (63) slides in a direction perpendicular to the detection seat (62). The first control unit (64) is mounted on the frame (1) and is used to drive the adjustment unit (61) to slide. The second control unit (65) is mounted on the adjustment unit (61) and is used to drive the detection unit (62) to slide. The third control unit (66) is mounted on the detection unit (62) and is used to drive the camera module (63) to slide. The light assembly (67) is mounted on the camera module (63) and is used to illuminate the detection area of ​​the double-sided printed matter. The lighting assembly (67) includes a first support rod (671), a second support rod (672), a spotlight (673), a first adjustment member (674), and a second adjustment member (675). Two of the first support rods (671) and the second support rods (672) are slidably arranged on the camera module (63) in opposite directions. The sliding direction of the second support rod (672) is perpendicular to the sliding direction of the first support rod (671). The first adjustment member (674) is arranged on the camera module and is used to drive the two first support rods (671) to slide. The second adjustment member (675) is arranged on the camera module and is used to drive the two second support rods (672) to slide. One spotlight (673) is arranged on each of the first support rods (671) and the second support rods (672).

2. The printing defect detection device according to claim 1, characterized in that: The pressing mechanism (4) includes a pressing seat (41), a pressing roller (42), a control component (43), and a width limiting component (44). The pressing seat (41) is slidably mounted on the frame (1) in the direction toward the back plate (3). Two pressing rollers (42) are rotatably mounted on the pressing seat (41) at intervals along the conveying direction of the double-sided printed matter. The control component (43) is mounted on the frame (1) and is used to drive the pressing seat (41) to slide. The width limiting component (44) is mounted on the frame (1) and is used to limit the displacement of the double-sided printed matter along the length direction of the pressing roller (42).

3. The printing defect detection device according to claim 2, characterized in that: The width limiting component (44) includes a sliding seat (441), a roller (442) and a driving member (443). The sliding seat (441) is slidably disposed on the frame (1) along the length direction of the pressure roller (42). The roller (442) is rotatably disposed on the sliding seat (441) and abuts against the double-sided printed material on the back plate (3). The driving member (443) is disposed on the frame (1) and is used to drive the sliding seat (441) to slide.

4. The printing defect detection device according to claim 1, characterized in that: The reversing mechanism (5) includes multiple guide rollers (51), all of which are rotatably mounted on the frame (1). The multiple guide rollers (51) are used to drive the conveying direction of the double-sided printed matter to change direction.

5. The printing defect detection device according to claim 1, characterized in that: The feeding mechanism (2) includes a feeding frame (21), an upper roller (22), an lower roller (23), a locking member (24), and a winding member (25). The feeding frame (21) is rotatably mounted on the frame (1). Multiple upper rollers (22) are rotatably mounted on the feeding frame (21) at circumferential intervals. Multiple lower rollers (23) are rotatably mounted on the feeding frame (21) at circumferential intervals. Multiple upper rollers (22) and multiple lower rollers (23) are symmetrically mounted on the feeding frame (21). The locking member (24) is mounted on the frame (1) and is used to lock the feeding frame (21). The winding member (25) is mounted on the frame (1) and is used to drive the lower roller (23) of the double-sided printed material that has completed winding detection to rotate.

6. The printing defect detection device according to claim 5, characterized in that: The winding component (25) includes a winding motor (251) and a coupling (252). The winding motor (251) is mounted on the frame (1), and the coupling (252) is mounted on the output shaft of the winding motor (251) and is used to coaxially connect to the unloading roller (23) of the double-sided printed matter after the winding inspection is completed.

7. A printing defect detection device according to claim 6, characterized in that: The frame (1) is provided with a marking mechanism (7) for marking defects on double-sided printed materials. The marking mechanism (7) includes a marking seat (71), a spray gun (72), a pusher (73), and a cutting assembly (74). The marking seat (71) is inclinedly arranged on the frame (1) along the conveying direction of the double-sided printed materials. The spray gun (72) is arranged on the marking seat (71) and is used to spray markings onto the defects of the printed materials. The pusher (73) is arranged on the frame (1) and is used to push the marking seat (71) to slide. The cutting assembly (74) is arranged on the frame (1) and is used to cut off the defects of the double-sided printed materials before they are wound onto the unloading roller (23).

8. A printing defect detection device according to claim 7, characterized in that: The cutting assembly (74) includes an identification camera (741), a cutter (742), a cutting component (743), and a control panel. At least two identification cameras (741) are provided on the frame (1), and the two identification cameras (741) are respectively located on both sides of the double-sided printed matter. The cutter (742) is slidably disposed on the frame (1) in the direction of the width of the double-sided printed matter. The cutting component (743) is disposed on the frame (1) and is used to drive the cutter (742) to slide. The control panel is disposed on the frame (1) and is electrically connected to the identification camera (741), the cutting component (743), and the winding motor (251).

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