Device for checking through printing of printed matter

Abstract

The utility model provides a device for checking through printing of a printed matter. The device comprises a plurality of light sensing units arranged in an array; the numerical value comparator is connected with the light sensing unit through a cable; and the first memory is connected with the numerical value comparator. According to the utility model, the light sensing units are arrayed so as to obtain reflected light information on the surface of a printed object; the array reflected light information of the surface of the checked printed matter is stored through the first storage, and non-recognizable digital storage of the printed matter printing content is achieved. The surface reflected light information, obtained by the light sensing unit, of the printed matter is compared with the surface reflected light information, stored in the first storage, of the corrected printed matter through the numerical value comparator, and whether the printed matter is subjected to skip printing or not is judged according to comparison of the reflected light information area by area; therefore, the problem of low-calculation-amount automatic detection of printing skip printing is solved.

Description

Technical Field

[0001] The utility model belongs to the field of printing equipment, and in particular relates to a device for checking missing prints of printed matter. Background Art

[0002] Book printing, a seemingly simple field yet richly intertwined with art and technology, is more than just transferring text and images onto paper; it is also an art form of cultural inheritance and innovation. Every book's creation undergoes a remarkable journey from scratch. After the design is complete, the platemaking stage begins. Traditional printing typically uses film-based platemaking, but modern technology favors computer-to-plate (CTP). This process transforms the design into a plate ready for printing, reducing intermediaries and improving efficiency and precision. Proofreading is also essential throughout the entire process to ensure the content is accurate and the format is standardized. Printing is a critical step in bringing a design to life. Depending on the needs, various processes can be chosen, including lithography, letterpress, gravure, or digital printing. Lithography is suitable for large-scale production, while digital printing offers greater flexibility, suiting small batches or personalized customization. The choice of ink and paper is also crucial, directly impacting the quality of the book and the reading experience.

[0003] However, due to various factors, occasional printing omissions may occur during the printing process. Manual inspection is labor-intensive and prone to omissions, while intelligent visual recognition technology has the problems of large computational complexity and high configuration costs. Utility Model Content

[0004] The utility model aims to solve the problem of low computational complexity automatic detection of printing omissions.

[0005] The purpose of this utility model is to adopt the following technical solutions to achieve:

[0006] A device for detecting missing prints in printed matter, comprising:

[0007] A plurality of light sensing units arranged in an array;

[0008] a numerical comparator connected to the light sensing unit via a cable;

[0009] The first memory is connected to the numerical comparator.

[0010] Preferably, the device further comprises a second memory connected to the numerical comparator.

[0011] Preferably, the light sensing unit includes a modular housing having an open end, an indicator light installed on one side of the housing, a lighting unit and a light sensor arranged in the modular housing and exposed at the open end, and an electrical interface arranged on one side of the modular housing and connected to the indicator light, the lighting unit and the light sensor.

[0012] Preferably, the numerical comparator includes any one of MCU, FPGA, CPLD, GAL, PAL, and ASIC.

[0013] Preferably, the first memory includes flash memory.

[0014] Preferably, the light sensing unit is fixed to a guide rail for realizing scanning.

[0015] Preferably, the device is placed in a dark room.

[0016] Preferably, the second memory includes SDRAM, DDR SDRAM or RDRAM.

[0017] Preferably, the shape of the modular housing includes rectangle, circle, and polygon.

[0018] Preferably, the modular housing is made of thermosetting plastic, low carbon steel, aluminum alloy, or aluminum-magnesium alloy.

[0019] Preferably, the manufacturing process of the modular housing includes sheet metal, injection molding, die casting, welding, clamping or a combination of the above.

[0020] Preferably, the indicator light comprises a multi-color LED.

[0021] Preferably, the lighting unit includes a full-color LED and / or a single-color LED.

[0022] Preferably, the light sensing unit includes a plurality of light sensors arranged in an array.

[0023] Preferably, the light sensor includes an illumination sensor and / or a color sensor.

[0024] Preferably, the electrical interface includes a serial interface and / or a parallel interface.

[0025] Preferably, the electrical interface includes a data terminal and a power terminal.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] The utility model provides a device for detecting missing prints in printed matter, the device comprising: a plurality of light-sensing units arranged in an array; a numerical comparator connected to the light-sensing units via a cable; and a first memory connected to the numerical comparator. The utility model arrays the light-sensing units to obtain reflected light information from the surface of a printed matter; stores the arrayed reflected light information from the surface of a proofread printed matter in the first memory, thereby achieving non-identifiable digital storage of printed matter content; compares the reflected light information from the surface of the printed matter obtained by the light-sensing units with the reflected light information from the surface of the proofread printed matter stored in the first memory via the numerical comparator, and determines whether a printed matter has missing prints based on the region-by-region comparison of the reflected light information; thereby solving the problem of automatic detection of missing prints with low computational effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of a printed matter missing print detection device of the utility model;

[0029] Figure 2 This is a schematic diagram of the installation of the light sensing unit in the present invention;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the light sensing unit in the present invention;

[0031] Among them: 1-light sensing unit, 2-numerical comparator, 3-first memory, 4-second memory, 5-guide rail, 6-slider, 7-fixed beam, 71-drive connection end, 11-full-color LED, 12-illuminance sensor, 13-color sensor, 14-monochrome LED, 15-modular housing, 16-electrical interface, 17-indicator light. DETAILED DESCRIPTION

[0032] The technical solution is further described below with reference to the accompanying drawings and specific embodiments to facilitate understanding of the content of the present utility model.

[0033] Example 1

[0034] like Figure 1-3 As shown, a printed matter missing print detection device, the device comprising:

[0035] A plurality of light sensing units 1 arranged in an array;

[0036] a numerical comparator 2 connected to the light sensing unit 1 via a cable;

[0037] The first memory 3 is connected to the numerical comparator 2 and is used to store the arrayed reflected light information of the surface of the proofread printed material. That is, the surface reflective value of the proofread printed material is stored as data A in the form of an array or a series, providing a standard value for printed material missing detection. The light sensing unit 1 scans the printed material to be detected and stores the reflective information in the same manner as data B in the form of an array or a series. i is an arbitrary value in data A, B i is an arbitrary value in data B; the numerical comparator 2 compares the numerical values ​​A one by one i and value B i , when the value A i and value B i The difference is less than the threshold value, and the printing is judged to be complete. i and value B i If the difference is greater than the threshold, it is judged as value B i There is a missing print in the corresponding position on the printed page.

[0038] The device further comprises a second memory 4 connected to the value comparator 2 . By storing the surface reflectance value of the printed matter obtained by scanning the light sensing unit 1 into the second memory 4 , faster and more stable synchronous processing can be achieved.

[0039] The light sensing unit 1 includes a modular housing 15 with an open end, an indicator light 17 mounted on one side of the housing 15, a lighting unit and a light sensor disposed within the modular housing 15 and exposed at the open end, and an electrical interface 16 disposed on one side of the modular housing 15 and connected to the indicator light 17, lighting unit, and light sensor. The lighting unit includes a full-color LED 11 and a single-color LED 14. The light sensor includes an illuminance sensor 12 and a color sensor 13.

[0040] The numerical comparator includes any one of an MCU, an FPGA, a CPLD, a GAL, a PAL, and an ASIC. An MCU microcontroller unit, an FPGA field-programmable gate array, a CPLD complex programmable logic device, a GAL generic array logic, a PAL programmable array logic, and an ASIC application-specific integrated circuit can all be used to implement the size comparison of two sets of data. The specific implementation process of the numerical comparator is all existing technology and does not need to be described in detail.

[0041] The first memory includes a flash memory.

[0042] The photosensitive unit 1 is fixed to the guide rail 5 for scanning through a fixed beam 7 and a slider 6. One end of the fixed beam 7 has a driving connection end 71 for connecting to a driver. The driver and the numerical comparator 2 are connected to synchronously realize scanning and collection and comparison of reflective information on the surface of the printed material, thereby realizing scanning leak detection for large-format printed materials.

[0043] The device is placed in a dark room to ensure the stability of the light source environment and avoid the influence of stray light.

[0044] The second memory includes SDRAM, DDR SDRAM or RDRAM.

[0045] The cross-sectional shape of the modular housing includes rectangular, circular, and polygonal; a shape that is convenient for modular integration is usually adopted, and a rectangular shape is selected in this embodiment.

[0046] The modular housing is made of thermosetting plastic, low carbon steel, aluminum alloy, or aluminum-magnesium alloy. In this embodiment, the modular housing is made of thermosetting plastic by injection molding.

[0047] The manufacturing process of the modular housing includes sheet metal, injection molding, die casting, welding, snap assembly or a combination thereof. In the present embodiment, injection molding and snap assembly are adopted.

[0048] The indicator light includes a multi-color LED to display different states; for example, green indicates that the detection is normal and there is no missing print, and red indicates that the difference in the reflected light of the printed matter exceeds a threshold.

[0049] The light sensing unit includes a plurality of light sensors arranged in an array, which can be arranged in a single column or in multiple columns and rows. The array of light sensors can achieve further refined perception within the scanning partition to achieve higher detection accuracy.

[0050] The electrical interface includes a serial interface and / or a parallel interface, with the parallel interface increasing the data bandwidth, but a mixed parallel and serial transmission method is also adopted when necessary; the electrical interface includes a data terminal and a power terminal, and the power terminal provides power to the light sensing unit 1.

[0051] Compared with the prior art, the beneficial effects of the present invention are:

[0052] The utility model provides a device for detecting missing prints in printed matter, the device comprising: a plurality of light-sensing units arranged in an array; a numerical comparator connected to the light-sensing units via a cable; and a first memory connected to the numerical comparator. The utility model arrays the light-sensing units to obtain reflected light information from the surface of a printed matter; stores the arrayed reflected light information from the surface of a proofread printed matter in the first memory, thereby achieving non-identifiable digital storage of printed matter content; compares the reflected light information from the surface of the printed matter obtained by the light-sensing units with the reflected light information from the surface of the proofread printed matter stored in the first memory via the numerical comparator, and determines whether a printed matter has missing prints based on the region-by-region comparison of the reflected light information; thereby solving the problem of automatic detection of missing prints with low computational effort.

[0053] Example 2

[0054] A device for detecting missing prints in printed matter, comprising:

[0055] A plurality of light sensing units arranged in an array;

[0056] a numerical comparator connected to the light sensing unit via a cable;

[0057] The first memory is connected to the numerical comparator and is used to store the arrayed reflected light information of the surface of the proofread printed material. That is, the surface reflectance value of the proofread printed material is stored as data A in the form of an array or a series, providing a standard value for printed material missing detection. The light sensing unit scans the printed material to be detected and stores the reflectance information in the same manner as data B in the form of an array or a series. i is an arbitrary value in data A, B i is an arbitrary value in data B; the numerical comparator 2 compares the numerical values ​​A one by one i and value B i , when the value A i and value B i The difference is less than the threshold value, and the printing is judged to be complete. i and value B i If the difference is greater than the threshold, it is judged as value B i There is a missing print in the corresponding position on the printed page.

[0058] The device further comprises a second memory connected to the numerical comparator. By storing the surface reflectance value of the printed matter obtained by scanning the light-sensitive unit into the second memory, faster and more stable synchronous processing can be achieved.

[0059] The difference from Example 1 is that the photosensitive units adopt an array of multiple rows and columns, and the photosensitive units are not fixed on a guide rail mechanism for scanning. The photosensitive areas expanded by the multi-row and multi-column array of the photosensitive units can cover the surface area of ​​the printed matter to be detected, so as to achieve the technical effect of synchronously collecting the reflective information on the surface of the printed matter without scanning once, which can significantly improve the speed of detecting missed prints.

[0060] Other necessary technical contents not described in this embodiment are the same as those in Embodiment 1 or are prior art, and thus will not be described in detail.

[0061] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention.

Claims

1. A printed matter missing print inspection device, characterized in that: The device comprises: A plurality of light sensing units arranged in an array; a numerical comparator connected to the light sensing unit via a cable; a first memory connected to the numerical comparator; The light sensing unit includes a modular housing with an open end, an indicator light mounted on one side of the housing, a lighting unit and a light sensor disposed in the modular housing and exposed at the open end, and an electrical interface disposed on one side of the modular housing and connected to the indicator light, the lighting unit, and the light sensor; The light sensing unit is fixed to a guide rail for realizing scanning.

2. A printed matter missing print inspection device as claimed in claim 1, characterized in that: The device further includes a second memory connected to the numerical comparator.

3. The printed matter missing print inspection device according to claim 1, characterized in that: The numerical comparator includes any one of MCU, FPGA, CPLD, GAL, PAL, and ASIC.

4. A printed matter missing print inspection device as claimed in claim 1, characterized in that: The first memory includes a flash memory.

5. The printed matter missing print inspection device according to claim 1, characterized in that: The apparatus was placed in a dark room.

6. The printed matter missing print inspection device according to claim 2, characterized in that: The second memory includes SDRAM, DDR SDRAM or RDRAM.

7. The printed matter missing print inspection device according to claim 1, characterized in that: The shape of the modular housing includes any one of rectangular, circular and polygonal.

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