Printed product quality inspection device

Abstract

The present invention relates to the technical field of printed product quality inspection, and discloses a printed product quality inspection device, comprising a frame, on which a motor, a winding wheel, and a visual inspection device are mounted, and further comprising: an unwinding structure, which is arranged on the frame; a tensioning structure, which is arranged on the unwinding structure; the unwinding structure comprising: a fixed plate; three support rods, which are all arranged on the fixed plate, and which are distributed in a circumferential array around the center of the fixed plate. The present invention uses the structure of a paper clip, a connecting rope, and a cross plate, so that the tail end of the printed roll can be effectively tightened and fixed on the line wheel. This is done to ensure that the printed roll remains flat when it is directly under the visual inspection device, to prevent the tail of the roll from loosening or deformation, and to ensure that the visual inspection device can perform accurate visual inspection of the printed product.

Description

Technical Field

[0001] The present invention relates to the technical field of printed matter quality detection, and in particular to a printed matter quality detection device. Background Art

[0002] Printed product quality inspection devices are equipment or systems used to inspect and evaluate the quality of printed products. These devices are commonly used in the printing industry to ensure that printed products meet expected quality standards, thereby providing consistent and reliable products.

[0003] After searching, the Chinese patent with the announcement number CN219341176U discloses a roll detection device for printing coils, including a base, a first wheel group, a second wheel group, a support wheel group and a detection component, and a support plate is provided at the upper end of the base, the support plate and the base are arranged perpendicular to each other, the support wheel group, the first wheel group and the second wheel group are fixedly mounted on the support plate, the first wheel group and the second wheel group are arranged parallel to each other, a support wheel group is provided between the first wheel group and the second wheel group, the inner ring of the roll core of the to-be-detected coil is fixedly connected to the periphery of the first wheel group, one end of the to-be-detected coil is extended along the support wheel group and fixedly connected to the periphery of the second wheel group, and a detection component is provided above the to-be-detected coil, and the detection component is fixedly connected to the support plate. The roll detection device for printing coils described in the above scheme is a universal detection machine with wide applicability and simple operation. However, the above scheme still has the following deficiencies in actual use:

[0004] The printing roll quality inspection device proposed in the above scheme is provided with a unwinding structure and a rewinding structure. The printing roll is placed on the unwinding structure, and the rewinding structure rewinds the printing roll so that the printing roll is transferred from the unwinding structure to the rewinding structure. During the transfer process, the printed product on the printing roll is visually inspected by the visual inspection equipment. When the inspection process comes to an end, the printing roll at the tail end will fall off from the unwinding structure and form a roll shape. If the tail end of the printing roll is deformed, this part of the printed material will not be able to be completely inspected by the visual inspection equipment, which may lead to failure to timely detect printing quality problems at the tail end, such as missing prints, blurring or offset, thereby affecting the quality control and consistency of the product. In addition, if the production line must be stopped to deal with defective products or restart the visual inspection process due to the falling off of the tail end of the roll, this will lead to reduced production efficiency because additional time and resources are required to deal with the part of the printing roll that fails to pass the inspection, which may increase costs and extend delivery time.

[0005] Therefore, it is necessary to design a quality detection device for printed matter to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a quality detection device for printed matter.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A printed product quality inspection device includes a frame on which a motor, a winding wheel, and a visual inspection device are mounted, and further includes:

[0009] An unwinding structure, wherein the unwinding structure is arranged on the frame;

[0010] a tensioning structure, wherein the tensioning structure is arranged on the unwinding structure;

[0011] The unwinding structure comprises:

[0012] Fixed plate;

[0013] Support rods, each of which is arranged on a fixed plate, and a plurality of groups of support rods are distributed in a circumferential array around the center of the fixed plate;

[0014] A back plate, the back plate being rotatably mounted on the frame;

[0015] a threaded rod, the threaded rod being rotatably mounted on the back plate;

[0016] A guide rod, wherein the guide rod is fixed to a side surface of the back plate;

[0017] A movable plate, wherein the movable plate is threadedly sleeved on the threaded rod and slidably sleeved on the two guide rods;

[0018] A first connecting rod, one end of which is fixedly connected to the movable plate, and the other end of which is fixedly connected to the fixed plate.

[0019] As a preferred technical solution of the present invention, the tensioning structure includes:

[0020] a mounting plate fixed to a side of the fixing plate;

[0021] A rotating shaft, the rotating shaft being rotatably mounted on a side surface of the mounting plate;

[0022] a clockwork spring, one end of which is connected to the rotating shaft, and the other end of which is connected to the mounting plate;

[0023] A wire wheel, wherein the wire wheel is fixedly sleeved on the rotating shaft;

[0024] A pull line, one end of which is connected to a pulley and wound around the pulley;

[0025] a horizontal plate connected to the other end of the pull wire;

[0026] a connecting rope, one end of which is connected to the transverse plate;

[0027] A paper clip is connected to the other end of the connecting rope.

[0028] As a preferred technical solution of the present invention, the pull wire and the horizontal plate are connected by a connecting structure, and the connecting structure includes:

[0029] a second connecting rod, the second connecting rod being fixed to an end of the pulling line away from the line wheel, and the outer surface of the second connecting rod being provided with a thread;

[0030] The connecting tube is fixed on the side of the horizontal plate, and the inner surface of the connecting tube is provided with a thread groove.

[0031] As a preferred technical solution of the present invention, the fixing plate, the back plate, the mounting plate, the rotating shaft and the wire wheel are coaxially arranged.

[0032] As a preferred technical solution of the present invention, a plurality of threaded openings are provided on the fixing plate, and a stud is fixed at one end of each of the support rods.

[0033] As a preferred technical solution of the present invention, a limiting structure is provided on the frame, and the limiting structure includes:

[0034] A fixing frame, wherein the fixing frame has a U-shaped structure;

[0035] An adjusting screw, the adjusting screw being rotatably mounted on the fixing frame, and the adjusting screw being provided with two threads of equal length and opposite directions;

[0036] Two adjustment plates, the two adjustment plates are respectively threadedly sleeved on the two sections of threads on the adjustment screw;

[0037] Two connecting plates, one end of each of the connecting plates being fixedly connected to the two adjusting plates respectively;

[0038] Two limiting rings, the two limiting rings are respectively fixed to the other ends of the two connecting plates, and the two limiting rings are movably sleeved on the winding wheel;

[0039] A connecting frame, one end of which is fixedly connected to the frame, and the other end of which is fixedly connected to the fixing frame.

[0040] As a preferred technical solution of the present invention, a marking structure and a driving structure are provided on the frame, and the marking structure includes:

[0041] Two cross bars, one end of each of the cross bars is fixedly connected to the frame;

[0042] A slide rail fixed to the other end of the two cross bars;

[0043] A slide seat, the slide seat being slidably arranged on the slide rail;

[0044] A pen holder is fixed on the side of the slide; and a marking pen is placed on the pen holder.

[0045] As a preferred technical solution of the present invention, the driving structure includes:

[0046] A servo motor, wherein the servo motor is mounted on the frame;

[0047] An eccentric wheel is fixedly mounted on the output shaft of the servo motor, and is eccentrically arranged between the eccentric wheel and the output shaft of the servo motor;

[0048] A tension spring, one end of which is connected to the servo motor, and the other end of which is connected to the slide.

[0049] As a preferred technical solution of the present invention, the eccentric wheel is arranged opposite to the slide seat.

[0050] The detection method of the printed matter quality detection device comprises the following steps:

[0051] Step 1: Install the printing roll on the three support rods to ensure that the printing roll is firmly supported. Use paper clips to clamp the end of the inner ring of the printing roll to prevent the roll from loosening or falling off.

[0052] Step 2: Pass one end of the outer ring of the printing roll through the bottom of the visual inspection equipment and connect it to the reel. Start the motor to drive the reel to start reeling. During the reeling process, the printed product on the printing roll will pass directly under the visual inspection equipment.

[0053] Step 3: The visual inspection equipment will perform visual inspection on the printed products on the printing roll. During the inspection process, the equipment will continuously record and analyze the quality parameters of the printed products;

[0054] Step 4: When the test is nearing the end, the printed roll will fall off the three support rods and move under the drive of the reel. Use the paper clip and connecting rope to operate the cross plate, pull the pull wire, and then drive the reel to rotate;

[0055] Step 5: If the visual inspection device detects a defect in the printed product, it sends a signal to the servo motor, which drives the eccentric wheel to apply pressure to the slide, so that the pen tip of the marking pen contacts the printed product and marks the defect location;

[0056] Step 6: After the test is completed, the staff rotates the connecting rod to separate the connection between the cable and the horizontal plate. After the paper clip stops exerting force on the cable, the cable wheel is affected by the spring and resets in the opposite direction, retracting the cable.

[0057] Step 7. Adjust the fixed plate and limit structure according to the size of the printing roll to ensure that the printing roll can accurately pass directly under the visual inspection equipment. The staff adjusts the threaded rod and adjusting screw through the knob to make the fixed plate and the limit ring during the winding process adapt to printing rolls of different sizes.

[0058] The present invention has the following beneficial effects:

[0059] 1. Through the structure of paper clips, connecting ropes, and cross plates, the tail end of the printed roll can be effectively tightened and fixed on the spool. The purpose of this is to ensure that the printed roll remains flat when it is directly under the visual inspection equipment, preventing the tail end from loosening or deforming, thereby ensuring that the visual inspection equipment can accurately inspect the printed products. This accuracy is critical to ensuring the consistency and high level of printing quality. By ensuring that the printed roll remains flat at the end of the inspection process, it can effectively reduce quality problems caused by loose or falling tail end, such as missing prints or print position deviation, which helps to reduce the production of defective products and improve the quality and consistency of the final product.

[0060] 2. The connecting rod and connecting cylinder in the design allow workers to quickly separate the cable and the cross plate when needed, and they can also be quickly reconnected after the inspection is completed. This design ensures that the equipment can be smoothly reset after the inspection is completed without being affected by the cross plate getting stuck on other components, thereby ensuring the stability and reliability of the equipment operation. Workers can easily separate and reconnect the cable and the cross plate by turning the connecting rod, which simplifies the operation process and reduces the reset time. This is very important for the efficiency of the production line because it reduces the downtime that may be caused by complicated operation steps;

[0061] 3. By adjusting the fixed plate and the limit structure, the operator can ensure that printed rolls of different sizes can pass accurately under the visual inspection equipment. This flexibility and adjustment capability ensures that the visual inspection equipment can accurately inspect printed rolls of various sizes. Regardless of the roll diameter, by ensuring that the printed roll passes directly under the visual inspection equipment, the design ensures that the visual inspection equipment can fully inspect the entire roll surface without missing or misdetecting due to different roll positions or sizes. This is crucial to ensuring the quality of printed products and the stability of the production process.

[0062] 4. When the visual inspection equipment detects a defect in a printed product, the servo motor is activated and drives the eccentric wheel, which brings the pen tip into contact with the moving printed product. This allows the pen to slide out a line segment or mark on the printed product, clearly indicating the location of the defect and providing clear instructions for subsequent personnel to handle the problem. By marking the defect location on the printed product, the design ensures that subsequent processing personnel can quickly identify and address the problem. This timely marking helps prevent defective products from entering downstream processes, thereby improving overall product quality and customer satisfaction.

[0063] 5. By adjusting the position of the support rods on the fixed plate, the staff can ensure that the three support rods can stably support printing rolls of different sizes. This ability is crucial to maintaining the balance and stability of the rolls, especially when the printing rolls have large or small diameters. The adjusted support rods can ensure that the printing rolls remain stable during operation, avoiding shaking or instability of the rolls during movement. This not only improves the safety of production line operations, but also helps protect equipment and reduce the risk of product damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a schematic diagram of the structure of the printed matter quality inspection device proposed by the present invention;

[0065] Figure 2 This is a schematic structural diagram of the printed product quality inspection device proposed by the present invention from another perspective;

[0066] Figure 3 It is a structural schematic diagram of the unwinding structure;

[0067] Figure 4 It is a structural diagram of the unwinding structure from another perspective;

[0068] Figure 5 It is a schematic diagram of the transmission structure between the motor, unwinding structure and winding wheel;

[0069] Figure 6 for Figure 2 A magnified view of the structure at point A;

[0070] Figure 7 for Figure 4 A magnified view of the structure at point B;

[0071] Figure 8 It is a structural diagram of the marking structure and the driving structure.

[0072] In the figure: 1 frame, 2 motor, 3 winding wheel, 4 visual inspection equipment, 51 fixed plate, 52 support rod, 53 back plate, 54 threaded rod, 55 guide rod, 56 movable plate, 57 first connecting rod, 61 mounting plate, 62 rotating shaft, 63 clockwork spring, 64 pulley, 65 pulling wire, 66 horizontal plate, 67 connecting rope, 68 paper clip, 71 second connecting rod, 72 connecting tube, 81 fixed frame, 82 adjusting screw, 83 adjusting plate, 84 connecting plate, 85 limiting ring, 86 connecting frame, 91 horizontal rod, 92 slide rail, 93 slide seat, 94 pen holder, 95 marking pen, 101 servo motor, 102 eccentric wheel, 103 tension spring. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0074] Reference Figure 1-8 The printed product quality inspection device includes a frame 1, on which a motor 2, a winding wheel 3 and a visual inspection device 4 are mounted. The specific structure and working principle of the visual inspection device 4 are not an innovative part of the present technical solution and are not shown in the figure, so they will not be described in detail here.

[0075] The quality inspection device also includes an unwinding structure, which is arranged on the frame 1 and includes: a fixed plate 51; a support rod 52, which is arranged on the fixed plate 51, and a plurality of support rods 52 are distributed in a circumferential array around the center position of the fixed plate 51, and a plurality of threaded openings are opened on the fixed plate 51, and a stud is fixed at one end of each support rod 52; a back plate 53, which is rotatably mounted on the frame 1; a threaded rod 54, which is rotatably mounted on the back plate 53; two guide rods 55, which are fixed on the side of the back plate 53; a movable plate 56, which is threadedly sleeved on the threaded rod 54, and the movable plate 56 The sliding sleeve is arranged on the two guide rods 55; two first connecting rods 57, one end of the two first connecting rods 57 is fixedly connected to the movable plate 56, and the other end of the two first connecting rods 57 is fixedly connected to the fixed plate 51. The position of the support rod 52 on the fixed plate 51 is adjustable. The staff can adjust the position of the three support rods 52 according to the size of the printing roll so that the three support rods 52 can stably support the printing roll. Specifically, a plurality of threaded openings are opened on the fixed plate 51, and a stud is fixed on each support rod 52. The staff can screw the stud into or out of the threaded opening by rotating the support rod 52, which is convenient for the staff to adjust the position of the support rod 52;

[0076] The quality inspection device also includes a tensioning structure, which is arranged on the unwinding structure. The tensioning structure includes: a mounting plate 61, which is fixed to the side of the fixed plate 51; a rotating shaft 62, which is rotatably mounted on the side of the mounting plate 61; a spring 63, one end of which is connected to the rotating shaft 62 and the other end is connected to the mounting plate 61; a wire wheel 64, which is fixedly sleeved on the rotating shaft 62; a pull wire 65, one end of which is connected to the wire wheel 64, and The pull wire 65 is wound around the reel 64, and the fixed plate 51, the back plate 53, the mounting plate 61, the rotating shaft 62 and the reel 64 are arranged coaxially; the horizontal plate 66 is connected to the other end of the pull wire 65, and the pull wire 65 and the horizontal plate 66 are connected by a connecting structure, which includes: a second connecting rod 71, the second connecting rod 71 is fixed to the end of the pull wire 65 away from the reel 64, and the outer surface of the second connecting rod 71 is provided with a thread; a connecting tube 72, the connecting tube 72 is fixed to The side of the horizontal plate 66 and the inner surface of the connecting tube 72 are provided with a threaded groove; a connecting rope 67, one end of the connecting rope 67 is connected to the horizontal plate 66; a paper clip 68, the paper clip 68 is connected to the other end of the connecting rope 67. When the detection process comes to the end, the printing roll will all fall off from the three support rods 52 and move under the driving action of the winding wheel 3. At this time, the tail end of the printing roll can pull the horizontal plate 66 through the paper clip 68 and the connecting rope 67, so that the horizontal plate 66 pulls the pull wire 65, thereby pulling The wire 65 extends from the wire wheel 64. Further, the wire 65 can drive the wire wheel 64 to rotate, and the shaft 62 will also rotate accordingly. When the shaft 62 rotates, the spring 63 can be deformed and accumulate force. Under the elastic force of the spring 63, the wire wheel 64 always has a tendency to rotate in the opposite direction. This allows the wire wheel 64 to tighten the tail end of the printing roll through the wire 65, so that the printing roll remains flat, thereby ensuring the accuracy of the visual inspection device 4 for the inspection of the tail part of the printing roll.

[0077] The frame 1 is provided with a limiting structure, which includes: a fixing frame 81, which is a U-shaped structure; an adjusting screw 82, which is rotatably mounted on the fixing frame 81, and the adjusting screw 82 is provided with two sections of threads of the same length and in opposite directions; two adjusting plates 83, which are respectively threadedly sleeved on the two sections of threads on the adjusting screw 82; two connecting plates 84, one end of the two connecting plates 84 is fixedly connected to the two adjusting plates 83; two limiting rings 85, which are respectively fixed to the other end of the two connecting plates 84, and the two limiting rings 85 are movably sleeved on the winding wheel 3; a connecting frame 86, one end of the connecting frame 86 is fixedly connected to the frame 1, and the other end is fixedly connected to the fixing frame 81. The staff rotates the handwheel at one end of the adjusting screw 82 to rotate the adjusting screw 82. The side surfaces of the adjusting plates 83 are in contact with the side surfaces of the fixing frame 81, so the two adjusting plates 83 cannot rotate along with the adjusting screw 82, but will move under the rotation of the adjusting screw 82. Since the adjusting screw 82 is provided with two sections of threads of the same length and in opposite directions, when the adjusting screw 82 rotates, the two adjusting plates 83 can move closer to or farther away from each other. When the two adjusting plates 83 move, they can drive the two limiting rings 85 to move through the two connecting plates 84 until the two limiting rings 85 are in contact with the printing roll in the winding state. The two limiting rings 85 play a limiting role in the winding process of the printing roll. At the same time, with the movable characteristics of the fixing plate 51, the printed products on the printing roll can pass directly under the visual inspection device 4, so that the visual inspection device 4 can accurately inspect printing rolls of different sizes.

[0078] The frame 1 is provided with a marking structure and a driving structure, the marking structure includes: two cross bars 91, one end of the two cross bars 91 is fixedly connected to the frame 1; a slide rail 92, the slide rail 92 is fixed to the other end of the two cross bars 91; a slide 93, the slide 93 is slidably arranged on the slide rail 92; a pen holder 94, the pen holder 94 is fixed to the side of the slide 93; a marking pen 95, the marking pen 95 is placed on the pen holder 94, and the driving structure includes: a servo motor 101, the servo motor 101 is installed on the frame 1; an eccentric wheel 102, the eccentric wheel 102 is fixedly sleeved on the output shaft of the servo motor 101, and the eccentric wheel 102 is eccentrically arranged between the output shaft of the servo motor 101, and the eccentric wheel 102 is arranged opposite to the slide 93; a tension spring 103, one end of the tension spring 103 is connected to the servo motor 101, and the other end is connected to the slide 93, the visual inspection device 4 sends a control signal to the servo motor 101, so that the servo motor 101 is powered on and operates, When the servo motor 101 is running, it can drive the eccentric wheel 102 to rotate. When the eccentric wheel 102 rotates, it can squeeze the slide 93, so that the slide 93 drives the pen holder 94 to move downward, and the marking pen 95 will also move downward, so that the pen tip of the marking pen 95 contacts the printed product in a moving state. When the pen tip of the marking pen 95 contacts the printed product in a moving state, the servo motor 101 runs in the opposite direction, driving the eccentric wheel 102 to rotate in the opposite direction. At this time, the eccentric wheel 102 no longer squeezes the slide 93, and the slide 93 will move up and reset under the action of the tension spring 103, and the marking pen 95 will also move up and separate from the printed product. In summary, under the cooperation of the marking structure and the driving structure, the marking pen 95 can slide out a line segment on the defective printed product, thereby marking the defective printed product, making it convenient for subsequent staff to further process the defective printed product.

[0079] The specific working principle of the present invention is as follows:

[0080] When using the printed product quality inspection device proposed by the present invention, the staff first places the printed roll on the three support rods 52, and uses the three support rods 52 to support the printed roll. Then, the staff clamps the end of the inner ring of the printed roll with a paper clip 68, and then passes one end of the outer ring of the printed roll under the visual inspection device 4 and connects it to the reel 3.

[0081] When the printing roll is to be inspected for quality, the staff starts the motor 2, such as Figure 5As shown, the output shaft of the motor 2, the winding wheel 3 and the unwinding structure are connected through a transmission member. This transmission method is a prior art and is not an innovative part of the present technical solution. It will not be described in detail here. The winding wheel 3 can wind up the printing roll when it rotates, so that the printing roll is wound on the winding wheel 3. During this process, the printed product on the printing roll will continuously pass under the visual inspection device 4 in a flat state, and the visual inspection device 4 will perform visual inspection on the printed product. When the inspection process comes to an end, the printing roll will all fall off from the three support rods 52 and move under the driving action of the winding wheel 3. When the tail end of the printing roll can pull the horizontal plate 66 through the paper clip 68 and the connecting rope 67, the horizontal plate 66 pulls the pulling wire 65, so that the pulling wire 65 is extended from the wire wheel 64. Further, the pulling wire 65 can drive the wire wheel 64 to rotate, and the rotating shaft 62 will also rotate accordingly. When the rotating shaft 62 rotates, the clockwork spring 63 can be deformed and force is stored. Under the elastic force of the clockwork spring 63, the wire wheel 64 always has a tendency to rotate in the opposite direction, which enables the wire wheel 64 to tighten the tail end of the printing roll through the pulling wire 65, so that the printing roll remains flat, thereby ensuring the detection accuracy of the visual inspection device 4 for the tail part of the printing roll;

[0082] When the pulley 64 is fully reset, the staff can use the connecting structure to connect the pulley 65 with the cross plate 66.

[0083] The position of the fixed plate 51 in the unwinding structure is adjustable, and a limiting structure for the winding wheel is also provided on the frame 1. When inspecting printed rolls of different sizes, the staff can adjust the fixed plate 51 and the limiting structure so that the printed roll can pass directly under the visual inspection device 4, thereby ensuring that the visual inspection device 4 can accurately inspect printed rolls of different sizes. Specifically, the staff turns the knob and uses the knob to drive the threaded rod 54 to rotate. When the threaded rod 54 rotates, under the limiting action of the two guide rods 55, the threaded rod 54 can drive the movable plate 56 to move. When the movable plate 56 moves, it can drive the fixed plate 51 to move through the two first connecting rods 57, so that the printed roll placed on the fixed plate 51 moves accordingly. In addition, the staff turns the handwheel at one end of the adjusting screw 82 to rotate the adjusting screw 82. The side surfaces of the two adjusting plates 83 are in contact with the side surfaces of the fixing frame 81, so the two adjusting plates 83 cannot rotate along with the adjusting screw 82, but will move under the rotation of the adjusting screw 82. Since the adjusting screw 82 is provided with two sections of threads of the same length and in opposite directions, when the adjusting screw 82 rotates, the two adjusting plates 83 can move closer to or farther away from each other. When the two adjusting plates 83 move, they can drive the two limiting rings 85 to move through the two connecting plates 84 until the two limiting rings 85 are in contact with the printing roll in the winding state. The two limiting rings 85 play a limiting role in the winding process of the printing roll. At the same time, with the movable characteristics of the fixing plate 51, the printed products on the printing roll can pass directly under the visual inspection device 4, so that the visual inspection device 4 can accurately detect printing rolls of different sizes.

[0084] Furthermore, the frame 1 is also provided with a marking structure and a driving structure. When the visual inspection device 4 detects a defective printed product, the visual inspection device 4 sends a control signal to the servo motor 101, so that the servo motor 101 is powered on and operates. When the servo motor 101 operates, it can drive the eccentric wheel 102 to rotate. When the eccentric wheel 102 rotates, it can squeeze the slide 93, so that the slide 93 drives the pen holder 94 to move downward, and the marking pen 95 also moves downward, so that the pen tip of the marking pen 95 contacts the printed product in a moving state. When the pen tip of the marking pen 95 contacts the printed product in a moving state, the servo motor 101 operates in the reverse direction, driving the eccentric wheel 102 When the marking pen 95 is moved upwards, the marking pen 95 is moved upwards and separated from the printed product. In summary, under the cooperation of the marking structure and the driving structure, the marking pen 95 can slide out a line segment on the printed product with defects, thereby marking the printed product with defects, making it convenient for subsequent staff to further process the printed product with defects. It is worth noting that the specific control method of the servo motor 101 of the visual inspection device 4 is the existing technology and is not an innovative part of the present technical solution. It is not shown in the figure and will not be described in detail here.

[0085] The positions of the support rods 52 on the fixed plate 51 are adjustable. The staff can adjust the positions of the three support rods 52 according to the size of the printing roll so that the three support rods 52 can stably support the printing roll. Specifically, a number of threaded openings are provided on the fixed plate 51, and each support rod 52 is fixed with a stud. The staff can rotate the support rod 52 to screw the stud into or out of the threaded opening, which makes it convenient for the staff to adjust the position of the support rod 52.

[0086] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A printed product quality inspection device, comprising a frame (1), wherein a motor (2), a reel (3) and a visual inspection device (4) are mounted on the frame (1), and characterized in that: Also includes: An unwinding structure, the unwinding structure being arranged on a frame (1); a tensioning structure, wherein the tensioning structure is arranged on the unwinding structure; The unwinding structure comprises: Fixed plate (51); Support rods (52), each of the support rods (52) is disposed on the fixed plate (51), and a plurality of groups of the support rods (52) are distributed in a circumferential array around the center of the fixed plate (51); A back plate (53), the back plate (53) being rotatably mounted on the frame (1); a threaded rod (54), the threaded rod (54) being rotatably mounted on the back plate (53); A guide rod (55), wherein the guide rod (55) is fixed to a side surface of the back plate (53); A movable plate (56), wherein the movable plate (56) is threadedly sleeved on the threaded rod (54), and the movable plate (56) is slidably sleeved on the guide rod (55); a first connecting rod (57), one end of the first connecting rod (57) being fixedly connected to the movable plate (56), and the other end of the first connecting rod (57) being fixedly connected to the fixed plate (51); The tensioning structure comprises: A mounting plate (61), wherein the mounting plate (61) is fixed to a side surface of the fixing plate (51); A rotating shaft (62), the rotating shaft (62) being rotatably mounted on a side surface of the mounting plate (61); a spring (63), one end of the spring (63) being connected to the rotating shaft (62) and the other end being connected to the mounting plate (61); A wire wheel (64), wherein the wire wheel (64) is fixedly sleeved on the rotating shaft (62); A pull wire (65), one end of which is connected to the wire wheel (64), and the pull wire (65) is wound around the wire wheel (64); a transverse plate (66), wherein the transverse plate (66) is connected to the other end of the pull wire (65); a connecting rope (67), one end of which is connected to the transverse plate (66); a paper clip (68), wherein the paper clip (68) is connected to the other end of the connecting rope (67); The pull wire (65) and the transverse plate (66) are connected via a connecting structure, and the connecting structure comprises: a second connecting rod (71), the second connecting rod (71) being fixed to an end of the pull line (65) away from the pulley (64), and the outer surface of the second connecting rod (71) being provided with a thread; A connecting tube (72), wherein the connecting tube (72) is fixed to the side of the transverse plate (66), and a threaded groove is provided on the inner surface of the connecting tube (72); A limiting structure is provided on the frame (1), and the limiting structure comprises: A fixing frame (81), wherein the fixing frame (81) is a U-shaped structure; An adjusting screw (82), the adjusting screw (82) being rotatably mounted on the fixing frame (81), and the adjusting screw (82) being provided with two threads of the same length and in opposite directions; Two adjustment plates (83), the two adjustment plates (83) are respectively threadedly sleeved on two sections of threads on the adjustment screw (82); Two connecting plates (84), one end of each of the two connecting plates (84) being fixedly connected to the two adjusting plates (83); Two limiting rings (85), the two limiting rings (85) are respectively fixed to the other ends of the two connecting plates (84), and the two limiting rings (85) are movably sleeved on the winding wheel (3); A connecting frame (86), one end of the connecting frame (86) is fixedly connected to the frame (1), and the other end is fixedly connected to the fixing frame (81).

2. The printed matter quality inspection device according to claim 1, characterized in that: The fixing plate (51), the back plate (53), the mounting plate (61), the rotating shaft (62) and the wire wheel (64) are coaxially arranged.

3. The printed matter quality inspection device according to claim 2, characterized in that: The fixing plate (51) is provided with a plurality of threaded openings, and a stud is fixed to one end of each support rod (52).

4. The printed matter quality inspection device according to claim 3, characterized in that: The frame (1) is provided with a marking structure and a driving structure, wherein the marking structure comprises: Two cross bars (91), one end of each of the cross bars (91) is fixedly connected to the frame (1); A slide rail (92), wherein the slide rail (92) is fixed to the other end of the two cross bars (91); A slide seat (93), wherein the slide seat (93) is slidably arranged on the slide rail (92); A pen holder (94), wherein the pen holder (94) is fixed to a side of the slide (93); A marking pen (95) is placed on a pen holder (94).

5. The printed matter quality inspection device according to claim 4, characterized in that: The driving structure includes: A servo motor (101), wherein the servo motor (101) is mounted on the frame (1); An eccentric wheel (102), wherein the eccentric wheel (102) is fixedly sleeved on the output shaft of the servo motor (101), and the eccentric wheel (102) and the output shaft of the servo motor (101) are eccentrically arranged; A tension spring (103), one end of which is connected to the servo motor (101), and the other end of which is connected to the slide seat (93).

6. The printed matter quality inspection device according to claim 5, characterized in that: The eccentric wheel (102) is arranged opposite to the slide seat (93).

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