A double-sided detection device based on printed articles

Abstract

The present invention relates to the field of printed product detection, and discloses a double-sided detection device for printed articles, including a mounting bracket. A mounting ring with a horizontal axis is arranged on the mounting bracket. A conveying component is arranged in the mounting ring through a connecting component. A driving component is arranged on the mounting bracket, and the driving component is used to drive the conveying component to rotate around the axis of the mounting ring. The conveying component includes a conveying unit whose conveying direction is parallel to the axis direction of the mounting ring. Two conveying units are arranged in the vertical direction, and the distance between the two conveying units is less than the thickness of the printed article to be detected. The conveying unit is divided into a overlapping section and an open section along the conveying direction. The overlapping section of the upper conveying unit is directly above the overlapping section of the lower conveying unit. The open sections of the two conveying units are arranged in opposite directions, and an optical detection unit is respectively arranged above the open sections of the two conveying units.

Description

Technical Field

[0001] The invention relates to the field of printed product detection, and in particular to a double-sided detection device based on printed objects. Background Art

[0002] Printed products are a general term for various products produced using printing technology. With the development of printing technology, printed products are used more and more widely in various fields, and the requirements for the printing quality of printed products are also getting higher and higher. Therefore, it is necessary to test the printed products. Some printed products are printed on both sides, so it is necessary to test the printed products on both sides.

[0003] Based on the search for double-sided detection technology for printed products, some existing technologies have been found, which are now introduced one by one:

[0004] First, the Chinese invention patent application with application publication number CN117849060A discloses a print quality inspection device with a double-sided inspection function, which supports the parts of the two sides of the print that are not printed with patterns by two first conveyor belts, and presses the two parts by a pressing component, and then simultaneously inspects the front and back of the print by upper and lower optical inspection modules, so as to achieve the purpose of double-sided simultaneous inspection and improve the inspection efficiency. However, the printed products include not only plate-type printed products, but also silk-type printed products, paper-type printed products, etc. Such printed products are soft, soft, and thin. By pressing and holding the side edges, wrinkles, bends, etc. are easily generated, which will affect the final optical inspection results. Therefore, its use has limitations and needs to be improved.

[0005] Secondly, the Chinese utility model patent with authorization announcement number CN221478692U discloses a printed product quality inspection device, which realizes double-sided inspection of printed products by clamping and turning over the printed products to interchange the front and back sides of the printed products. This method is prone to wrinkles when turning over soft, flexible and thin printed products, which also has limitations and needs to be improved.

[0006] Based on the above, the present invention proposes a double-sided detection device based on printed products for soft, flexible and thin printed products. Summary of the invention

[0007] In order to solve the problems mentioned in the above background, the present invention provides a double-side detection device based on printed objects.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0009] A double-sided detection device based on printed articles, comprising a mounting bracket, on which there is a mounting ring with a horizontally arranged axis. Inside the mounting ring, a conveying component is arranged through a connecting component, and the conveying component can rotate around the axis of the mounting ring. A driving component is arranged on the mounting bracket, and the driving component is used to provide driving power for the rotation of the conveying component;

[0010] The conveying component includes a conveying unit whose conveying direction is parallel to the axis direction of the mounting ring. There are two conveying units arranged vertically, and the distance between the two conveying units is less than the thickness of the printed article to be detected;

[0011] The conveying unit is divided into a coincident section and an open section along the conveying direction. The coincident section of the upper conveying unit is directly above the coincident section of the lower conveying unit, and the open sections of the two conveying units are arranged in opposite directions. Above each of the open sections of the two conveying units, there is an optical detection unit.

[0012] As a further improvement and optimization of the present invention, on each of the two side surfaces of the mounting bracket along the axis direction of the mounting ring, there is an upper mounting plate. The two upper mounting plates are respectively located above the open sections of the two conveying units, and the two optical detection units are respectively arranged at the bottoms of the two upper mounting plates.

[0013] As a further improvement and optimization of the present invention, the lengths of the coincident section and the open section of the conveying unit are equal.

[0014] As a further improvement and optimization of the present invention, the connecting component includes a gear ring coaxially sleeved on the outer circular surface of the mounting ring. An arc plate is coaxially and fixedly arranged on the inner wall of the gear ring. An annular avoidance groove is coaxially penetrated through the inner circular surface of the mounting ring. A connecting rod is arranged on the inner arc surface of the arc plate. The end of the connecting rod passes through the annular avoidance groove and is fixedly provided with a connecting bracket, and the connecting bracket is connected with the conveying unit.

[0015] As a further improvement and optimization of the present invention, the conveying unit includes an inner skeleton fixedly connected with the connecting bracket. At each end of the inner skeleton, there is a conveyor belt wheel. A conveyor belt is arranged between the two conveyor belt wheels, and the inner skeleton provides internal support for the conveyor belt from the inside. A conveying motor is arranged on one side of the inner skeleton, and the conveying motor is in power connection with any one of the conveyor belt wheels.

[0016] As a further improvement and optimization of the present invention, the driving component includes a driving motor arranged on the mounting bracket. A gear is arranged at the output end of the driving motor, and the gear meshes with the gear ring.

[0017] As a further improvement and optimization of the present invention, a protective cover is provided outside the mounting ring. The protective cover includes two semi-circular shells in an arc shape. The two semi-circular shells together form a complete cylindrical cover. The cylindrical cover is sleeved outside the mounting ring and the gear ring is located inside the cylindrical cover. The inner ring surface of the cylindrical cover is open. A notch is provided at the bottom of the cylindrical cover. The notch is used to avoid the meshing of the gear and the gear ring. There is a lower shielding plate extending downward on each side of the notch. The two lower shielding plates are respectively located on both sides of the gear.

[0018] As a further improvement and optimization of the present invention, a number of identification lines are arranged in an array along the extending direction on the outer surface of the conveyor belt.

[0019] There are two processes for detecting printed products.

[0020] The first one:

[0021] Step 1: Place the printed product flat on the open section of the lower conveying unit, and perform optical detection on the front of the printed product through the corresponding optical detection unit.

[0022] Step 2: The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions and moving speeds are the same, so that the printed product is clamped by the overlapping section of the two conveying units.

[0023] Step 3: The drive motor is started to drive the conveying component to rotate 180 degrees around the mounting ring. The upper and lower positions of the two conveying units are reversed, and the front and back of the printed product are reversed.

[0024] Step 4: The two conveying units are started synchronously, and when pulling the object to move, the moving directions and moving speeds still remain the same, so that the printed product leaves the overlapping section of the conveying units and is located on the open section of the conveying units, and optical detection on the back of the printed product is realized through the corresponding optical detection unit.

[0025] The second one:

[0026] Step 1: Place the printed product flat on the open section of the lower conveying unit. The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions are the same. The moving speed of the upper conveying unit is greater than that of the lower conveying unit, so as to flatten and correct the wrinkles of the printed product.

[0027] Step 2: The moving speeds and moving directions of the two conveying units pulling the object to move are the same. The flattened printed product is pulled to the open section of the lower conveying unit, and optical detection on the front of the printed product is realized through the corresponding optical detection unit.

[0028] Step 3: The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions and moving speeds are the same, so that the printed product is clamped by the overlapping section of the two conveying units;

[0029] Step 4: The drive motor is started to drive the conveying component to rotate 180 degrees around the mounting ring, the upper and lower positions of the two conveying units are reversed, and the front and back of the printed product are reversed;

[0030] Step 5: The two conveying units are started synchronously, and the moving directions and moving speeds when pulling the object to move still remain the same, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and the optical detection of the back of the printed product is realized through the corresponding optical detection unit.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This solution can realize the double-sided detection of soft, thin printed products. On this basis:

[0033] On the one hand, the structure of this solution is simple. The drive component drives the conveying component to rotate around the axis of the mounting ring, and through the cooperation of the two conveyor belts of the conveying component, the clamping of the printed product is realized. During the clamping process and after the clamping, when the printed product is pulled to move to the open section of the conveyor belt, since the moving directions and moving speeds of the two conveyor belts pulling the object to move are the same, therefore, the printed product will not be wrinkled, bent, etc. The printed product remains in a flat state and is supported by the conveyor belt below, so as to realize the optical detection of soft, thin printed products and the detection result has a high accuracy;

[0034] On the other hand, the cooperation of the two conveyor belts can also correct the wrinkles of the printed product. Specifically, when the two conveying units pull the object to move, the moving directions are the same, but the moving speeds are different. The moving speed of the upper conveying unit is faster than that of the lower conveying unit. In this way, during the process of the printed product being clamped by the two conveyor belts, just after one side of the printed product is clamped, because the pulling moving speed of the upper conveyor belt is faster, so it is equivalent to: taking the lower conveyor belt as a reference object, the lower conveyor belt does not move, and the upper conveyor belt moves with the speed difference between the two and pulls the printed product to move, so as to flatten and correct the wrinkles of the printed product. Brief Description of the Drawings

[0035] Figure 1 It is a three-dimensional structure diagram of the present invention;

[0036] Figure 2 It is a front view of the present invention;

[0037] Figure 3Schematic diagram of the protective cover, mounting bracket and mounting ring;

[0038] Figure 4 Schematic diagram of the mounting ring, connecting component and driving component;

[0039] Figure 5 Schematic diagram of the connecting component and the conveying component;

[0040] Figure 6 Schematic diagram of the conveying component, arc plate and connecting bracket;

[0041] Figure 7 Exploded view of the conveying component.

[0042] The reference numerals in the drawings are:

[0043] 100, mounting bracket; 101, mounting ring; 1011, annular avoidance groove; 102, connecting component; 1021, gear ring; 1022, arc plate; 1023, connecting bracket; 103, conveying component; 1031, inner skeleton; 1032, conveyor belt pulley; 1033, conveyor belt; 1034, conveying motor; 1035, identification line; 104, driving component; 1041, driving motor; 1042, gear; 105, upper mounting plate; 106, optical detection unit; 107, protective cover; 1071, semi-circular shell; 1072, lower shielding plate. Detailed implementation manners

[0044] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0045] Referring to Figures 1-7 , a double-sided detection device for printed articles, comprising a mounting bracket 100, on which a mounting ring 101 with a horizontally arranged axis is provided. Inside the mounting ring 101, a conveying component 103 is arranged through a connecting component 102. The conveying component 103 can rotate around the axis of the mounting ring 101. A driving component 104 is provided on the mounting bracket 100, and the driving component 104 is used to provide driving power for the rotation of the conveying component 103.

[0046] The conveying component 103 includes a conveying unit whose conveying direction is parallel to the axis direction of the mounting ring 101. There are two conveying units arranged vertically. Further, the gap between the two conveying units is slightly smaller than the thickness of the printed article to be detected. It should be noted that this solution mainly aims at the detection of soft, thin printed articles. Of course, the detection of plate-like printed products is also possible.

[0047] The conveying unit is divided into an overlapping section and an open section along the conveying direction. Among them, the overlapping section of the upper conveying unit is directly above the overlapping section of the lower conveying unit, that is, they overlap with each other, and the open sections of the two conveying units are arranged in opposite directions.

[0048] On both sides of the mounting bracket 100 along the axial direction of the mounting ring 101, there is respectively an upper mounting plate 105. The two upper mounting plates 105 are respectively located above the open sections of the two conveying units. At the bottom of the upper mounting plate 105, there is an optical detection unit 106. The optical detection unit 106 can be realized by existing technologies and will not be elaborated here. For example, it can be a camera or an optical scanning component, etc.

[0049] When this solution is used, the printed product is laid flat on the open section of the lower conveying unit manually or by existing robotic arm technologies, etc. The front of the printed product is optically detected through the corresponding optical detection unit 106. Then the conveying unit is started to pull the printed product forward, so that the printed product is clamped by the overlapping sections of the two conveying units. After being clamped, the conveying component 103 rotates 180 degrees around the mounting ring 101, and the two conveying units are turned upside down. Then the two conveying units continue to pull the printed product to move, so that the printed product is located in the open section of the conveying unit, and the back of the printed product is optically detected through the corresponding optical detection unit 106. Thus, the double-sided detection of the printed product is completed, and during the detection process, the printed product will not wrinkle or bend, and the accuracy of the detection result is higher.

[0050] Furthermore, the front detection of multiple printed products can be completed at one time, and then it is turned 180 degrees to complete the back detection of the printed products, and the detection efficiency is higher. Preferably, the lengths of the overlapping section and the open section of the conveying unit are equal. The significance is to maximize the number of printed products that can be detected at one time.

[0051] Refer to Figures 3-6 , the connecting component 102 includes a gear ring 1021 coaxially sleeved on the outer circular surface of the mounting ring 101. The inner wall of the gear ring 1021 is coaxially and fixedly provided with an arc plate 1022. The inner circular surface of the mounting ring 101 is coaxially penetrated with an annular avoidance groove 1011. The inner arc surface of the arc plate 1022 is provided with a connecting rod, and the end of the connecting rod passes through the annular avoidance groove 1011 and is fixedly provided with a connecting bracket 1023; Therefore, driving the gear ring 1021 to rotate can drive the arc plate 1022 and the connecting bracket 1023 to rotate together.

[0052] Refer to Figure 6 And Figure 7, the conveying unit includes an inner skeleton 1031 fixedly connected to the connecting bracket 1023. A conveyor pulley 1032 is installed at each end of the inner skeleton 1031. A conveyor belt 1033 is arranged between the two conveyor pulleys 1032, and the inner skeleton 1031 provides internal support for the conveyor belt 1033 from the inside, so that the conveyor belt 1033 will not sag.

[0053] A conveying motor 1034 is arranged on one side of the inner skeleton 1031. The conveying motor 1034 is power-connected to any one of the conveyor pulleys 1032. By driving the conveying motor 1034, the conveyor pulley 1032 can be driven to rotate, so that the conveyor belt 1033 moves. In addition, when the connecting bracket 1023 rotates, it can drive the conveying unit to rotate together.

[0054] Refer to Figure 4 , the driving assembly 104 includes a driving motor 1041 arranged on the mounting bracket 100. A gear 1042 is arranged at the output end of the driving motor 1041. The gear 1042 meshes with the gear ring 1021. By driving the driving motor 1041 to drive the gear 1042 to rotate, the gear 1042 drives the gear ring 1021 to rotate, so that the conveying unit can be driven to rotate around the axis of the mounting ring 101.

[0055] In a preferred embodiment, in order to prevent surrounding objects or staff from accidentally touching the gear ring 1021 or the gear 1042 and being damaged, refer to Figure 1 And Figure 2 , a protective cover 107 is arranged outside the mounting ring 101. Further, refer to Figure 3 , the protective cover 107 includes two semi-circular shells 1071 in an arc shape. The two semi-circular shells 1071 together form a complete cylindrical cover. The cylindrical cover is sleeved outside the mounting ring 101 and the gear ring 1021 is located inside the cylindrical cover. The inner ring surface of the cylindrical cover is open. A notch is arranged at the bottom of the cylindrical cover. The notch is used to avoid the meshing of the gear 1042 and the gear ring 1021. There is a lower shielding plate 1072 extending downward in each side of the notch for cooperating with the mounting bracket 100 to cover the gear 1042. In this way, both the gear ring 1021 and the gear 1042 are shielded, and the safety is relatively high. In addition, the two semi-circular shells 1071 can be assembled by bonding with an adhesive or by bolts.

[0056] In a preferred embodiment, refer to Figure 7 , a plurality of marking lines 1035 are arranged in an array along the extending direction on the outer surface of the conveyor belt 1033. The meaning is that when detecting, the printed product is placed within the marking lines 1035 to assist in the accurate placement of the printed product.

[0057] There are various detection methods for the present invention, which are introduced one by one as follows:

[0058] The first method:

[0059] The printed product is laid flat on the open section of the lower conveyor belt 1033 by means of manual labor or existing robotic arms and other technologies. The optical detection unit 106 is used to perform optical detection on the front of the printed product. After the front detection is completed, the two conveying units are started synchronously, and the moving directions and moving speeds of the two conveying units when pulling the object to move are the same. In this way, the printed product can be clamped by the overlapping section of the two conveyor belts 1033, and during the clamping process, the printed product will not wrinkle;

[0060] After clamping, the drive motor 1041 is started to drive the conveying component 103 to rotate 180 degrees around the mounting ring 101. The upper and lower positions of the two conveying units are reversed, and the front and back of the printed product are reversed. Then, the two conveying units are started synchronously, and the moving directions and moving speeds of the two conveying units when pulling the object to move still remain the same, so that the printed product leaves the overlapping section and is located on the open section of the conveyor belt 1033. And during this process, the printed product still will not wrinkle;

[0061] Then, the optical detection unit 106 is used to perform optical detection on the back of the printed product. Thus, the double-sided detection of the printed product is completed, and during the detection process, the printed product will not wrinkle or bend, and the accuracy of the detection result is higher.

[0062] Furthermore, the front detection of multiple printed products can be completed at one time, and then it is rotated 180 degrees to complete the back detection of the printed product, and the detection efficiency is higher.

[0063] The second method:

[0064] The printed product is laid flat on the open section of the lower conveyor belt 1033 by means of manual labor or existing robotic arms and other technologies;

[0065] Then, the two conveying units are started synchronously, and the moving directions of the two conveying units when pulling the object to move are the same, but the moving speeds are different. The moving speed of the upper conveying unit is faster than that of the lower conveying unit. In this way, during the process of the printed product being clamped by the overlapping section of the two conveyor belts 1033, just after one side of the printed product is clamped, because the pulling moving speed of the upper conveyor belt 1033 is faster, so it is equivalent to: taking the lower conveyor belt 1033 as the reference object, the lower conveyor belt 1033 does not move, and the upper conveyor belt 1033 moves at the speed difference between the two and pulls the printed product to move. In this way, even if the printed product has wrinkles, they will be flattened and corrected;

[0066] Then, the moving speeds and directions of the two conveying units for pulling the object are the same. The flattened printed product is pulled to the open section of the lower conveyor belt 1033, and the front side is detected by the corresponding optical detection unit 106. Then, referring to the first method, the back side of the printed product is optically detected.

[0067] Of course, this solution can also be used for detecting printed products with only single-sided printing.

[0068] As can be seen from the above:

[0069] This solution can achieve double-sided detection of soft, thin printed products. On this basis:

[0070] On the one hand, the structure of this solution is simple. The driving component drives the conveying component to rotate around the axis of the installation ring. Through the cooperation of the two conveyor belts of the conveying component, the clamping of the printed product is realized. During the clamping process and when pulling the printed product to the open section of the conveyor belt after clamping, since the moving directions and speeds of the two conveyor belts for pulling the object are the same, the printed product will not be wrinkled or bent. The printed product remains in a flat state and is supported by the lower conveyor belt, so as to realize the optical detection of soft, thin printed products with relatively high accuracy of the detection result.

[0071] On the other hand, the cooperation of the two conveyor belts can also correct the wrinkles of the printed product. Specifically, when the two conveying units pull the object, the moving directions are the same, but the moving speeds are different. The moving speed of the upper conveying unit is faster than that of the lower conveying unit. In this way, when the printed product is clamped by the two conveyor belts, just after one side of the printed product is clamped, due to the faster pulling speed of the upper conveyor belt, it is equivalent to: taking the lower conveyor belt as a reference, the lower conveyor belt does not move, and the upper conveyor belt moves with the speed difference between the two and pulls the printed product to move, so as to flatten and correct the wrinkles of the printed product.

[0072] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A double-sided detection device based on printed articles, comprising a mounting bracket (100), characterized in that, An installation bracket (100) is provided with an installation ring (101) whose axis is horizontally arranged. Inside the installation ring (101), a conveying component (103) is arranged through a connecting component (102). The conveying component (103) can rotate around the axis of the installation ring (101). A driving component (104) is arranged on the installation bracket (100), and the driving component (104) is used to provide driving power for the rotation of the conveying component (103). The conveying component (103) includes a conveying unit whose conveying direction is parallel to the axis direction of the installation ring (101). Two conveying units are arranged vertically, and the distance between the two conveying units is less than the thickness of the printed article to be detected. The conveying unit is divided into a coincident section and an open section along the conveying direction. The coincident section of the upper conveying unit is directly above the coincident section of the lower conveying unit. The open sections of the two conveying units are arranged in opposite directions, and an optical detection unit (106) is respectively arranged above the open sections of the two conveying units. The two conveying units are started synchronously, and the moving directions are the same when the two conveying units pull the object to move. The connecting component (102) includes a gear ring (1021) coaxially sleeved on the outer circular surface of the installation ring (101). An arc plate (1022) is coaxially and fixedly arranged on the inner wall of the gear ring (1021). An annular avoidance groove (1011) is coaxially penetrated through the inner circular surface of the installation ring (101). A connecting rod is arranged on the inner arc surface of the arc plate (1022). The end of the connecting rod passes through the annular avoidance groove (1011) and then a connecting bracket (1023) is fixedly arranged. The connecting bracket (1023) is connected with the conveying unit. The conveying unit includes an inner skeleton (1031) fixedly connected with the connecting bracket (1023). A conveyor belt wheel (1032) is installed at each end of the inner skeleton (1031). A conveyor belt (1033) is arranged between the two conveyor belt wheels (1032), and the inner skeleton (1031) provides internal support for the conveyor belt (1033) from the inside. A conveying motor (1034) is arranged on one side of the inner skeleton (1031), and the conveying motor (1034) is power-connected with any one of the conveyor belt wheels (1032).

2. The double-sided detection device for printed articles according to claim 1, wherein On both sides of the installation bracket (100) along the axis direction of the installation ring (101), an upper mounting plate (105) is respectively arranged. The two upper mounting plates (105) are respectively located above the open sections of the two conveying units, and the two optical detection units (106) are respectively arranged at the bottoms of the two upper mounting plates (105).

3. The double-sided detection device based on printed articles according to claim 1, wherein, The lengths of the coincident section and the open section of the conveying unit are equal.

4. A double-sided detection device for printed articles according to claim 1, characterized in that, The driving component (104) includes a driving motor (1041) arranged on the installation bracket (100). A gear (1042) is arranged at the output end of the driving motor (1041), and the gear (1042) meshes with the gear ring (1021).

5. The double-sided detection device for printed articles according to claim 4, characterized in that, A protective housing (107) is provided outside the mounting ring (101). The protective housing (107) includes two semi-circular shells (1071) in an arc shape. The two semi-circular shells (1071) together form a complete cylindrical housing. The cylindrical housing is sleeved outside the mounting ring (101), and the gear ring (1021) is located inside the cylindrical housing. The inner ring surface of the cylindrical housing is open, and a notch is provided at the bottom of the cylindrical housing. The notch is used to avoid the meshing of the gear (1042) and the gear ring (1021). There is a lower shielding plate (1072) extending downward on each side of the notch. The two lower shielding plates (1072) are respectively located on both sides of the gear (1042).

6. The double-sided detection device based on printed articles according to claim 4, characterized in that, A number of identification lines (1035) are arranged in an array along the extension direction on the outer surface of the conveyor belt (1033).

7. A double-sided detection device for printed articles according to claim 4, characterized in that, The process of detecting a printed product includes the following steps: Step 1: Place the printed product flat on the open section of the lower conveying unit, and perform optical detection on the front side of the printed product through the corresponding optical detection unit (106). Step 2: The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions and moving speeds are the same, so that the printed product is clamped by the overlapping section of the two conveying units. Step 3: The drive motor (1041) is started to drive the conveying assembly (103) to rotate 180 degrees around the mounting ring (101). The upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed product are reversed. Step 4: The two conveying units are started synchronously, and when pulling the object to move, the moving directions and moving speeds still remain the same, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and optical detection of the back side of the printed product is achieved through the corresponding optical detection unit (106).

8. A double-sided detection device for printed articles according to claim 4, characterized in that, The process of detecting a printed product includes the following steps: Step 1: Place the printed product flat on the open section of the lower conveying unit. The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions are the same, and the moving speed of the upper conveying unit is greater than that of the lower conveying unit, so as to flatten and correct the wrinkles of the printed product. Step 2: The two conveying units pull the object to move with the same moving speed and moving direction, and pull the flattened printed product to the open section of the lower conveying unit, and perform optical detection on the front side of the printed product through the corresponding optical detection unit (106). Step 3: The two conveying units are started synchronously, and when the two conveying units pull the object to move, the moving directions and moving speeds are the same, so that the printed product is clamped by the overlapping section of the two conveying units. Step 4: The drive motor (1041) is started to drive the conveying assembly (103) to rotate 180 degrees around the mounting ring (101). The upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed product are reversed. Step 5: The two conveying units are started synchronously, and when pulling the object to move, the moving directions and moving speeds still remain the same, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and optical detection of the back side of the printed product is achieved through the corresponding optical detection unit (106).

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