Offline printing quality inspection device

Abstract

This utility model provides an offline printing quality inspection device, relating to the field of printed matter inspection technology, including a device frame. The device frame has a hollow internal structure, with a groove at the top. A suction plate is fixed inside the groove, and a fan is fixedly installed at the center of each of the left and right sides of the device frame. A motor A on the positioning frame drives a reverse-threaded shaft, causing two positioning plates to slide along the positioning frame, allowing them to conform to the left and right edges of the printed matter. This helps confirm the centering of the printed matter, further ensuring its stable position and laying the foundation for accurate subsequent image acquisition, reducing inspection deviations caused by problems with the fixed position of the printed matter. This addresses the problem that existing inspection devices often have ineffective methods for fixing printed matter, leading to offsets and wrinkles, which can result in inaccurate target positions during image acquisition and subsequent image comparison discrepancies.

Description

Technical Field

[0001] This utility model belongs to the field of printing inspection technology, and more specifically, relates to an offline printing quality inspection device. Background Technology

[0002] In the printing process, it is necessary to control the quality of printed materials. There are two stages to control the quality of printed materials. One is pre-press, which uses plate-matching software to check the content of the files before and after editing and find errors in the file editing process. The other stage is to use an offline inspection system to collect high-precision images of the printed materials and compare them with PDF files to automatically detect the integrity of the printed content. This can detect printing defects such as plate scratches, missing words, and text errors. At the same time, the offline inspection system can also be used to conduct random checks on the quality of printed materials to prevent the generation of continuous defective products.

[0003] Application number CN202223108179.1 discloses a large-format printing quality offline inspection machine. The machine includes a frame and a printed matter input mechanism mounted on the frame. It comprises a frame, a suction and flattening module, and an image acquisition module. The suction and flattening module is mounted on the frame and used to hold the printed matter to be inspected. The image acquisition module is slidably mounted on the frame and used to acquire image information of the printed matter on the suction and flattening module. The image acquisition module includes a column, a camera assembly, and a light source assembly. The column is slidably mounted on the frame, the camera assembly is located at the top of the column, and the light source assembly is located at the bottom of the column, above the suction and flattening module. One end of the light source assembly is hinged to the column, and the other end is supported on the suction and flattening module via guide wheels. This invention uses a fixed suction plate and a movable camera and light source, which can greatly save the space occupied by the equipment and achieve the purpose of large-format printing quality inspection.

[0004] Another application, CN202422445973.8, discloses an offline inspection platform, including a display assembly, a suction plate assembly, an inspection assembly, a motion assembly, a frame assembly, and an industrial control computer assembly. The suction plate assembly is fixedly installed on the top of the frame assembly, and the printed product to be tested is laid flat on the top surface of the suction plate assembly. The motion assembly is fixedly installed on the top of the frame assembly and on opposite sides of the suction plate assembly. An imaging module is provided on the inspection assembly, and both ends of the inspection assembly are connected and installed on the motion assembly. The motion assembly drives the inspection assembly to move linearly along the length or width of the suction plate assembly. The imaging module takes pictures of the printed product to be tested on the top surface of the suction plate assembly. The industrial control computer assembly performs printing quality inspection on the captured images and displays the inspection results through the display assembly. The suction plate assembly of this offline inspection platform can ensure flat product adsorption, high product inspection quality, high efficiency of plate matching or sampling inspection, and reduce the labor intensity of workers.

[0005] Based on the above patent searches and understanding of existing offline printing quality inspection applications: Traditional inspection devices are not effective at fixing printed materials, and are prone to offset and wrinkles. This can lead to inaccurate target positions during image acquisition, resulting in deviations in subsequent image comparisons. Consequently, they cannot accurately identify printing defects such as scratches and missing characters on the printing plate, which seriously affects the reliability of the inspection results. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides an offline printing quality inspection device. This device solves the problem that existing inspection devices are not effective in fixing printed materials, which can easily lead to offset and wrinkles. This results in inaccurate target positions during image acquisition, causing deviations in subsequent image comparisons and making it impossible to accurately identify printing defects such as scratches and missing characters on the printing plate, thus seriously affecting the reliability of the inspection results.

[0007] The technical solution adopted in this utility model is as follows: An offline printing quality inspection device includes a frame; the frame has a hollow internal structure with a groove at the top, where a suction plate is fixed; a fan is fixedly installed at the middle of each of the left and right sides of the frame; a positioning frame is fixedly installed at the rear of the top of the frame, positioned above and behind the suction plate; a motor A is fixedly installed at the middle of the left side of the positioning frame, with the shaft of motor A passing through the middle of the frame's interior, and the shaft having reverse threads on both sides; the left and right sides of the positioning frame are slidably connected to the rear of a positioning plate, with the two positioning plates located above the frame; each positioning plate has a threaded hole at the rear of its side, and both ends of the motor A's shaft are located within the threaded holes of one of the positioning plates.

[0008] According to one embodiment of the present invention, an adjustment frame is fixedly installed at the top center of the positioning frame, and a motor B is fixedly installed at the left side of the adjustment frame. The shaft of the motor B is threaded, and a sliding block is slidably connected at the center of the interior of the adjustment frame. The shaft of the motor B is located in the threaded hole of the sliding block.

[0009] According to one embodiment of the present invention, the top position of the sliding block is fixedly connected to the bottom rear position of the fine-tuning frame, and the fine-tuning frame is located above the equipment rack.

[0010] According to one embodiment of the present invention, a motor C is provided at the front end of the fine-tuning frame, and the shaft of the motor C is threaded and located inside the fine-tuning frame. A fine-tuning block is slidably positioned back and forth inside the fine-tuning frame, and a through threaded hole is provided at the middle of the front end of the fine-tuning block. The shaft of the motor C is located inside the threaded hole of the fine-tuning block.

[0011] According to one embodiment of the present invention, a detection component is fixedly installed on the right side of the fine-tuning block. The detection component consists of an industrial camera, an LED module, and an image processing module, and is equipped with a display.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Motor A on the positioning frame drives the reverse threaded shaft, causing the two positioning plates to slide along the positioning frame. This allows them to fit against the left and right edges of the printed material, helping to confirm that the printed material is centered and further ensuring the stability of the printed material's position. This lays the foundation for subsequent accurate image acquisition and reduces detection deviations caused by problems with the fixed position of the printed material.

[0013] 2. The adjustment frame at the top of the positioning frame is equipped with motor B, whose threaded shaft drives the sliding block to move the fine-tuning frame and detection components laterally; the motor C at the front end of the fine-tuning frame drives the fine-tuning block to slide the detection components back and forth through the threaded shaft. This multi-directional and precisely controllable adjustment method can flexibly adjust the position of the detection components according to the size and placement of the printed matter. Whether it is a large-format printed matter or a non-standard-sized printed matter, it can ensure that the detection components cover the entire area to be detected, eliminate detection blind spots, and improve the comprehensiveness of detection. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the offline printing quality inspection device of this utility model.

[0015] Figure 2 This is a top view schematic diagram of the offline printing quality inspection device of this utility model.

[0016] Figure 3 This is a schematic diagram of the left side of the offline printing quality inspection device of this utility model.

[0017] Figure 4 This is a side view of the offline printing quality inspection device of this utility model.

[0018] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Equipment frame; 101. Suction plate; 102. Fan; 103. Positioning frame; 104. Motor A; 105. Positioning plate; 2. Adjustment frame; 201. Motor B; 202. Sliding block; 203. Fine-tuning frame; 204. Motor C; 205. Fine-tuning block; 3. Detection components. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The use of terms such as "a," "an," or "the" in this utility model patent application specification and claims does not indicate a quantity limitation, but rather indicates the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. Example:

[0022] As attached Figure 1 To be continued Figure 4 As shown: This utility model provides an offline printing quality inspection device, including a device frame 1. The device frame 1 has a hollow internal structure and a groove at the top. A suction plate 101 is fixed in the groove. A fan 102 is fixedly installed at the middle of both the left and right sides of the device frame 1. A positioning frame 103 is fixedly installed at the rear of the top of the device frame 1. The positioning frame 103 is located above and behind the suction plate 101. A motor A104 is fixedly installed at the middle of the left side of the positioning frame 103. The shaft of the motor A104 passes through the middle of the interior of the positioning frame 103. The left and right sides of the shaft of the motor A104 have reverse threads. The left and right sides of the interior of the positioning frame 103 are slidably connected to the rear of a positioning plate 105. The two positioning plates 105 are located above the device frame 1. Each positioning plate 105 has a threaded hole at the rear of its side. The two ends of the shaft of the motor A104 are located in the threaded holes of the positioning plate 105.

[0023] The positioning frame 103 has an adjustment frame 2 fixedly installed at the top center position, and a motor B201 fixedly installed at the left side position of the adjustment frame 2. The shaft of the motor B201 is threaded, and a sliding block 202 is slidably connected at the inner center position of the adjustment frame 2. The shaft of the motor B201 is located in the threaded hole of the sliding block 202.

[0024] The top position of the sliding block 202 is fixedly connected to the bottom rear position of the fine-tuning frame 203, which is located above the equipment frame 1.

[0025] The fine-tuning frame 203 has a motor C204 at its front end, and the shaft of the motor C204 is threaded and located inside the fine-tuning frame 203. A fine-tuning block 205 slides back and forth inside the fine-tuning frame 203. A through threaded hole is opened at the middle of the front end of the fine-tuning block 205, and the shaft of the motor C204 is located inside the threaded hole of the fine-tuning block 205.

[0026] The fine-tuning block 205 has a fixed installation of a detection component 3 on its right side. The detection component 3 consists of an industrial camera, an LED module, and an image processing module, and is equipped with a display.

[0027] When using: Preset detection parameters, import the standard PDF file corresponding to the printed material to be detected for image comparison through the control system of detection component 3, set the brightness of the LED module and adjust it according to the color depth of the printed material to ensure image clarity, and set the shooting resolution and acquisition frequency of the industrial camera according to the detection accuracy requirements.

[0028] When fixing the printed material, lay the printed material to be tested flat on the surface of the suction plate 101 at the top of the equipment frame 1, start the fans 102 on the left and right sides of the equipment frame 1, the operation of the fans 102 creates a negative pressure inside the equipment frame 1, and the printed material is firmly fixed by the suction force of the suction plate 101. Observe whether there are wrinkles on the surface of the printed material. If there are wrinkles, gently smooth them out and then confirm the suction effect again.

[0029] Start the motor A104 on the left side of the positioning frame 103. The reverse threaded shaft of the motor A104 drives the two positioning plates 105 to slide left and right along the inside of the positioning frame 103 until the inner side of the two positioning plates 105 are respectively in contact with the left and right edges of the printed matter. This is used to help confirm that the printed matter is centered at the top center of the suction plate 101, so as to avoid the printing matter shifting and causing detection deviation.

[0030] Start the motor B201 on the left side of the adjustment frame 2. The threaded shaft of the motor B201 drives the sliding block 202 to move laterally along the inside of the adjustment frame 2. The sliding block 202 drives the top fine adjustment frame 203 and the detection component 3 to move synchronously until the detection component 3 is roughly directly above the area of ​​the printed matter to be inspected.

[0031] Start the motor C204 at the front end of the fine-tuning frame 203. The threaded shaft of the motor C204 drives the fine-tuning block 205 to slide back and forth along the inside of the fine-tuning frame 203. The fine-tuning block 205 drives the detection component 3 to move back and forth. The position of the detection component 3 can be adjusted according to the placement of the printed matter.

[0032] According to the image acquisition function of the detection component 3, the industrial camera acquires images of the printed matter on the suction plate 101 at a preset frequency. The LED module provides a stable light source at the same time to ensure that the acquired image has uniform brightness and clear details. The image processing module compares the acquired printed matter image with the preset standard PDF file in real time, automatically detects printing defects such as printing plate scratches, missing characters, and text errors, and displays the detection results on the monitor in real time.

[0033] Although this application has been described with reference to the foregoing embodiments, those skilled in the art will understand that various changes can be made without departing from the spirit and scope of this application as defined by the appended claims. While this specification contains details of many specific implementations, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular embodiments. The scope of this application is defined by the appended claims and their equivalents, and is not limited to the embodiments described above.

Claims

1. An offline printing quality inspection device, characterized in that: The equipment includes a frame (1); the internal structure of the frame (1) is hollow, and a groove is provided at the top of the frame (1). A suction plate (101) is fixed in the groove of the frame (1). A fan (102) is fixedly installed at the middle of the left and right sides of the frame (1). A positioning frame (103) is fixedly installed at the rear of the top of the frame (1). The positioning frame (103) is located above and behind the suction plate (101). A motor A (102) is fixedly installed at the middle of the left side of the positioning frame (103). 04), the shaft of motor A (104) passes through the middle of the inside of the positioning frame (103), and the left and right sides of the shaft of motor A (104) are designed with reverse threads. The left and right sides of the inside of the positioning frame (103) are slidably connected to the rear of a positioning plate (105). The two positioning plates (105) are located above the equipment frame (1). Each positioning plate (105) has a threaded hole on the rear side. The two ends of the shaft of motor A (104) are located in the threaded hole of a positioning plate (105).

2. The offline printing quality inspection device as described in claim 1, characterized in that: An adjustment frame (2) is fixedly installed at the top middle position of the positioning frame (103). A motor B (201) is fixedly installed at the left side position of the adjustment frame (2). The shaft of the motor B (201) is threaded. A sliding block (202) is slidably connected at the middle position inside the adjustment frame (2). The shaft of the motor B (201) is located in the threaded hole of the sliding block (202).

3. The offline printing quality inspection device as described in claim 2, characterized in that: The top position of the sliding block (202) is fixedly connected to the bottom rear position of the fine-tuning frame (203), and the fine-tuning frame (203) is located above the equipment frame (1).

4. The offline printing quality inspection device as described in claim 3, characterized in that: The front end of the fine-tuning frame (203) is provided with a motor C (204), and the shaft of the motor C (204) is threaded and located inside the fine-tuning frame (203). A fine-tuning block (205) slides back and forth inside the fine-tuning frame (203). A through threaded hole is opened at the middle of the front end of the fine-tuning block (205), and the shaft of the motor C (204) is located inside the threaded hole of the fine-tuning block (205).

5. The offline printing quality inspection device as described in claim 4, characterized in that: The fine-tuning block (205) has a detection component (3) fixedly installed on its right side. The detection component (3) consists of an industrial camera, an LED module, and an image processing module, and is equipped with a display.

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