Digital Encoding Variable Distance Pad Printing Device

Abstract

This utility model relates to the field of pad printing technology, specifically a digital encoding variable-distance pad printing device. It includes a mounting platform with multiple steel plates, each with a corresponding lead screw module between it and the steel plates. Each steel plate has an ink cup, and the mounting platform is equipped with a doctor blade cylinder module. Above the steel plates are ink heads adapted to the characters, and a workpiece placement position is provided on the side wall of the mounting platform. A sliding module is also provided above the mounting platform, and its moving end is connected to the ink head via a variable-distance module. This sliding module drives the ink head to reciprocate between the ink-dipping position directly above the steel plate and the printing position of the workpiece placement position, thereby achieving character dipping and printing. Through the above technical solution, this utility model solves the problems of low printing efficiency, large required movement space, and limited color options.

Description

Technical Field

[0001] This utility model relates to the field of pad printing machine technology, specifically to a digitally encoded variable-distance pad printing device. Background Technology

[0002] In industries where large, independent serial numbers are printed using color inks, such as safety helmet manufacturing, the serial numbers printed on products or components must be unique, and each printout must contain different information. This places high demands on the efficiency, flexibility, and adaptability of the serial number printing process. Currently, the mainstream serial number printing methods in the industry mainly include hot stamping, screen printing, and traditional pad printing. Among these, traditional pad printing is relatively superior in terms of character precision and adaptability, making it a commonly used method for printing independent serial numbers. However, existing technologies still have many shortcomings and cannot meet the needs of efficient printing of large batches of multi-digit independent serial numbers. Specific problems are as follows:

[0003] Existing pad printing machines generally use a single-character cyclic printing mode. This requires pre-printing numbers 0- and the required English letters or symbols on a steel plate, using a single ink cup to perform the scraping action, leaving ink within the recessed characters. A lead screw module then drives the ink-dipping head, picking up only one character at a time. Each character printing requires a complete cycle of scraping, dipping, and printing. If printing multi-digit numbers, such as 6-digit numbers, this cycle needs to be repeated 6 times. Actual tests show that printing a single 6-digit number takes 2-3 minutes. The more digits in the number, the lower the printing efficiency, making it unsuitable for mass production scenarios.

[0004] In existing digital pad printing machines, the ink-dipping head and drive cylinder are mounted at the front end of the three-coordinate lead screw module. To complete character pickup and multi-position printing, the ink head needs to perform large-scale movements in multiple directions (up, down, left, right, forward, and backward), resulting in a large required movement space for the equipment. Furthermore, the presence of personnel or obstacles within this movement range can easily interfere with normal equipment operation and even cause collisions, threatening the safety of the operating environment. Moreover, existing pad printing machines are only equipped with a single ink cup, allowing only one character to be printed per cycle using only one color of ink. Utility Model Content

[0005] In order to solve the problems in related technologies, this utility model provides a digital encoding variable distance pad printing device, which solves the problems of low printing efficiency, large equipment movement space, and limited color options.

[0006] To solve the above problems, the following technical solutions are provided:

[0007] This utility model's digital coding variable-distance pad printing device includes a mounting platform. Multiple steel plates are arranged parallel to each other horizontally on the mounting platform. The upper surface of each steel plate is engraved with recessed characters. A lead screw module is correspondingly provided between each steel plate and the mounting platform. The output end of the lead screw module is fixedly connected to the bottom of the steel plate, driving the steel plate to move horizontally to form different digital codes. Each steel plate is equipped with an ink cup. A scraper cylinder module is provided on one side of the mounting platform corresponding to the ink cup, used to push the ink cup to scrape ink. A rubber head adapted to the characters is provided above each steel plate. A workpiece placement position is provided on the side wall of the mounting platform. A sliding module is also provided above the mounting platform. The moving end of the sliding module is connected to the rubber head, driving the rubber head to reciprocate between the ink-dipping position directly above the steel plate and the printing position of the workpiece placement position, thereby achieving character dipping and printing.

[0008] The above solution utilizes multiple steel plates and corresponding screw modules. Each steel plate independently carries a single recessed character, and the screw module drives the steel plate to move horizontally, quickly combining to form different numerical codes. This eliminates the need to pick up only one character at a time and repeat multiple cycles. With a single ink cup corresponding to a single steel plate, the doctor blade cylinder module can simultaneously or in batches complete the doctoring action on multiple steel plates. The sliding module drives the ink head to pick up characters from multiple steel plates at once and transfer them to the workpiece, achieving single-pass printing of a set of numbers, thus improving printing efficiency. By centrally arranging the steel plates, ink cups, and doctor blade cylinder module on the mounting platform, the sliding module only needs to drive the ink head to move back and forth between the ink-coating position on the steel plate and the workpiece placement position. The range of motion is controllable, and all moving parts are arranged in an orderly manner around the mounting platform, avoiding large-scale space occupation. Simultaneously, the workpiece placement position is clearly set on the side wall of the mounting platform, clearly separated from the ink head movement path, reducing the risk of personnel or obstacles interfering with equipment operation and significantly improving operational safety. This solves the problems of low printing efficiency, large equipment movement space, and limited color options.

[0009] The steel plates and lead screw modules are matched one-to-one. The lead screw modules can flexibly drive the steel plates to move and adjust their combinations. This can accommodate printing of digital codes with different digits, and can also meet diverse coding needs by replacing the steel plates engraved with different characters (such as numbers, English letters, and symbols). Furthermore, the workpiece placement position is an independently set positioning structure, which can be easily adjusted to accommodate workpieces of different sizes and shapes, such as flat workpieces and convex curved workpieces, which helps to improve the adaptability of the pad printing machine.

[0010] Furthermore, the sliding module includes a drive motor, a first driving wheel, and a first driven wheel. The output shaft of the drive motor is fixedly connected to the central shaft of the first driving wheel. The first driven wheel and the first driving wheel are arranged parallel to each other along the length of the mounting platform. A synchronous belt is sleeved on the outer wall of the first driving wheel and the first driven wheel. A slide is fixedly mounted on the synchronous belt, and a pitch-changing module is fixedly mounted on the lower end surface of the slide.

[0011] In the above solution, by setting up a sliding module and turning on the drive motor, the fixed slide on the synchronous belt can move stably with the synchronous belt, ensuring that the movement path of the glue head from the ink-dip position to the printing position is precise and controllable, reducing problems such as character printing misalignment and blurring caused by glue head offset, and ensuring that the numbering is printed neatly and beautifully.

[0012] Furthermore, the variable pitch module includes a connector, a first cylinder, and a first motor. The top of the connector is fixedly connected to the lower end face of the slide table, and a guide rail is provided along the length direction at the bottom of the connector. The first cylinder is located on the guide rails on both sides of the connector, and the piston rod of the first cylinder extends downward and is fixedly connected to the guide rail. The first motor is located on the side wall of the guide rail, and a second driving wheel is provided on the output shaft of the first motor. A bidirectional screw is horizontally arranged inside the guide rail along its length direction. A second driven wheel is fixedly arranged at one end of the bidirectional screw near the second driving wheel, and the other end of the bidirectional screw is rotatably connected to the inner wall of the guide rail through a bearing. The rod of the bidirectional screw has two sections of external threads with opposite directions of rotation. A belt is sleeved on the outer wall of the second driving wheel and the second driven wheel. Multiple sliders are evenly distributed on the guide rail. The sliders are adapted to the bidirectional screws and are slidably connected to the guide rail. The rubber head is located on the corresponding slider.

[0013] In the above solution, by setting up a variable pitch module, when the first motor drives the bidirectional screw to rotate via belt drive, the slider can move in opposite directions along the guide rail, thereby precisely adjusting the spacing between the pads. This solves the problem that existing pad printing machines cannot adjust the character spacing. It can adapt to the spacing of multiple steel plates when dipping in ink, and can shrink the pad spacing to a suitable size during printing, ensuring uniform spacing of numbers on the product.

[0014] Furthermore, the lead screw module includes a lead screw motor, a mounting bracket, and a track. The lead screw motor is fixedly mounted on the platform of the mounting table. A lead screw arranged along the length of the steel plate is fixedly mounted on the output shaft of the lead screw motor. A fixing plate is provided at the end of the track away from the lead screw motor. The other end of the lead screw is rotatably connected to the fixing plate through a bearing. The mounting bracket is located between the steel plate and the lead screw and is fixedly connected to the steel plate. A sliding block adapted to the lead screw is sleeved on the lead screw. The lower end face of the sliding block is adapted to the track and is slidably connected to the track. The sliding block is fixedly connected to the mounting bracket. A support seat is provided between the steel plate and the mounting bracket.

[0015] In the above solution, by setting the lead screw module, the lead screw motor can precisely control the rotation angle of the lead screw, thereby driving the steel plate to move horizontally with a precision of 0.05 mm. This ensures high character alignment when multiple steel plates are combined for digital encoding, avoiding encoding misalignment caused by steel plate offset.

[0016] The support base is used to provide uniform support to the bottom of the steel plate, disperse the stress on the steel plate during movement, and prevent the steel plate from bending, tilting or other deformation problems due to its own weight or movement inertia, thereby improving the stability of the steel plate movement.

[0017] Furthermore, the ink scraper cylinder module includes a second cylinder and a placement seat. The placement seat is located above the steel plate and has multiple placement slots for placing ink cups. The piston rod of the second cylinder is fixedly connected to the placement seat.

[0018] In the above solution, the installation of the ink scraping cylinder module allows all ink cups to synchronously scrape ink along the steel plate surface when the second cylinder drives the placement seat to move. This significantly shortens the preparation time for a single code printing and ensures uniform ink scraping for each ink cup, resulting in consistent ink retention within the recessed characters on each steel plate and guaranteeing stable printing quality. The precise fit between the placement slot and the ink cup effectively limits the ink cup's movement, preventing it from shaking or tipping over during the scraping process.

[0019] Furthermore, the ink cup includes a cup body, a scraper, and a magnetic ring. The lower end face of the cup body has an annular mounting groove for accommodating the magnetic ring, and the lower end face of the magnetic ring is flush with the lower end face of the cup body. The scraper is fixedly installed at the lower opening of the cup body, and the lower end face of the scraper is slightly lower than the lower end face of the magnetic ring.

[0020] In the above solution, by setting up the ink cup, the magnetic ring can magnetically attract the ink cup tightly to the surface of the steel plate, forming a reliable seal between the ink cup and the steel plate. This effectively prevents the ink in the cup from leaking out of the gaps when scraping or standing, reducing ink waste. At the same time, it avoids the leaked ink from contaminating the surface of the steel plate, ensuring the purity of the ink in the recessed characters and improving the clarity of the printed characters. In addition, the scraper can form a tight contact with the surface of the steel plate, accurately scraping away excess ink from the surface of the steel plate, leaving only a certain amount of ink in the recessed characters.

[0021] Furthermore, an adjustment assembly is provided between the slider and the rubber head, the adjustment assembly including an adjustment screw, a first nut and a second nut; the lower end face of the slider is provided with a threaded hole that matches the upper end of the adjustment screw, and is locked and fixed by the first nut; the upper end face of the rubber head is provided with a connecting seat, the connecting seat is provided with a through hole that matches the lower end of the adjustment screw, and is locked and fixed by the second nut.

[0022] In the above solution, by adjusting the components and loosening the first and second nuts, the extension length of the adjusting screw can be adjusted vertically, thereby changing the distance between the rubber head and the steel plate / workpiece surface. When dealing with recessed characters on steel plates of different depths, the rubber head height can be lowered to ensure full contact with the ink. When the workpiece has a convex curved surface or different thicknesses, the rubber head height can be finely adjusted to ensure a tight fit between the rubber head and the workpiece surface, avoiding insufficient ink application or blurry printing due to unsuitable height.

[0023] The above solution has the following advantages:

[0024] 1. The digital coding variable-distance pad printing device of this utility model, by setting up multiple steel plates and corresponding screw modules, allows each steel plate to independently carry a single recessed character. The screw module can drive the steel plates to move horizontally to quickly combine and form different digital codes, eliminating the need to pick up only one character at a time and repeat multiple cycles. With a configuration of one ink cup corresponding to one steel plate, the doctor blade cylinder module can simultaneously or in batches complete the doctor blade action of multiple steel plates. The sliding module drives the rubber head to pick up characters from multiple steel plates at once and transfer them to the workpiece, achieving single printing of a set of numbers, which helps improve printing efficiency. The steel plates, ink cups, and doctor blade cylinder module are centrally arranged on the mounting platform. The sliding module only needs to drive the rubber head to move back and forth between the ink-coating position on the steel plate and the workpiece placement position. The range of motion is controllable, and all moving parts are arranged in an orderly manner around the mounting platform, avoiding large-scale space occupation. At the same time, the workpiece placement position is clearly set on the side wall of the mounting platform, clearly separated from the rubber head movement path, reducing the risk of personnel or obstacles interfering with equipment operation and significantly improving operational safety.

[0025] 2. By adjusting the component settings and loosening the first and second nuts, the extension length of the adjusting screw can be adjusted vertically, thereby changing the distance between the rubber head and the steel plate / workpiece surface. When dealing with recessed characters on steel plates of different depths, the rubber head height can be lowered to ensure full contact with the ink. When the workpiece has a convex curved surface or different thicknesses, the rubber head height can be finely adjusted to ensure a tight fit between the rubber head and the workpiece surface, avoiding insufficient ink application or blurry printing due to unsuitable height. Attached Figure Description

[0026] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0027] Figure 1 A schematic diagram of a digital encoding variable-distance pad printing device;

[0028] Figure 2 This is a schematic diagram of the lead screw module in a digital encoding variable-pitch pad printing device.

[0029] Figure 3A cross-sectional view of the lead screw module and ink cup in a digital coding variable-pitch pad printing device;

[0030] Figure 4 A schematic diagram of the initial open state of the variable pitch module in a digital encoding variable pitch pad printing device;

[0031] Figure 5 A schematic diagram of the retracted state of the variable pitch module in a digital encoding variable pitch pad printing device;

[0032] Figure 6 for Figure 3 Enlarged diagram of section A in the middle;

[0033] Figure 7 for Figure 4 Enlarged diagram of section B;

[0034] Explanation of reference numerals in the attached drawings: 1. Mounting platform; 2. Steel plate; 3. Lead screw module; 301. Lead screw motor; 302. Mounting bracket; 303. Rail; 304. Lead screw; 305. Fixing plate; 306. Sliding block; 307. Support base; 4. Ink cup; 401. Cup body; 402. Scraper blade; 403. Magnetic ring; 5. Scraper cylinder module; 501. Second cylinder; 502. Placement base; 6. Sliding module; 601. Drive motor; 602. Slide table; 7. Variable pitch module; 701. Connector; 702. First cylinder; 703. First motor; 704. Guide rail; 705. Slider; 8. Adjustment component; 801. Adjusting screw; 802. First nut; 803. Second nut; 804. Connecting base; 9. Rubber head. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] In specific embodiment 1, such as Figures 1-7As shown, the digital coding variable-distance pad printing device of this utility model includes a mounting platform 1. Multiple steel plates 2 are arranged parallel to each other in the horizontal direction on the mounting platform 1. The upper surface of each steel plate 2 is engraved with recessed characters. A lead screw module 3 is correspondingly provided between each steel plate 2 and the mounting platform 1. The output end of the lead screw module 3 is fixedly connected to the bottom of the steel plate 2, used to drive the steel plate 2 to move horizontally to form different digital codes. Each steel plate 2 is equipped with an ink cup 4. A scraper cylinder module 5 is provided on one side of the mounting platform 1 corresponding to the ink cup 4, used to push the ink cup 4 to scrape ink. A glue head 9 adapted to the characters is provided above the steel plate 2. A workpiece placement position is provided on the side wall of the mounting platform 1 for placing workpieces. A sliding module 6 is also provided above the mounting platform 1. The moving end of the sliding module 6 is connected to the glue head 9 through a variable-distance module 7, used to drive the glue head 9 to reciprocate between the ink-dipping position directly above the steel plate 2 and the printing position of the workpiece placement position, so as to realize the dipping and printing of characters. Each steel plate 2 independently carries a single recessed character. The lead screw module 3 can drive the steel plate 2 to move horizontally to quickly combine and form different numerical codes, eliminating the need to pick up only one character at a time and repeat multiple cycles. With a single ink cup 4 corresponding to a single steel plate 2, the doctor blade cylinder module 5 can simultaneously or in batches complete the doctor blade action for multiple steel plates 2. The sliding module 6 drives the ink head 9 to pick up characters from multiple steel plates 2 at once and transfer them to the workpiece, achieving single printing of a set of numbers, which improves printing efficiency. The steel plates 2, ink cups 4, and doctor blade cylinder module 5 are centrally arranged on the mounting platform 1. The sliding module 6 only needs to drive the ink head 9 to move back and forth between the ink-coating position and the workpiece placement position on the steel plate 2. The range of motion is controllable, and all moving parts are arranged in an orderly manner around the mounting platform 1, avoiding large-scale space occupation. At the same time, the workpiece placement position is clearly set on the side wall of the mounting platform 1, clearly separated from the movement path of the ink head 9, reducing the risk of personnel or obstacles interfering with equipment operation and significantly improving operational safety.

[0037] The steel plate 2 and the lead screw module 3 correspond one-to-one. The lead screw module 3 can flexibly drive the steel plate 2 to move and adjust the combination. It can not only adapt to the printing of digital codes with different digits, but also meet diverse coding needs by replacing the steel plate 2 with different characters, such as different numbers, English letters and symbols. In addition, the workpiece placement position is an independently set positioning structure, which can be easily adjusted to adapt to workpieces of different sizes and shapes, such as flat workpieces and convex curved workpieces, which helps to improve the adaptability of the pad printing machine.

[0038] The sliding module 6 includes a drive motor 601, a first driving wheel, and a first driven wheel. The output shaft of the drive motor 601 is fixedly connected to the central shaft of the first driving wheel. The first driven wheel and the first driving wheel are arranged parallel to each other along the length of the mounting platform 1. A synchronous belt is fitted onto the outer wall of the first driving wheel and the first driven wheel. A slide table 602 is fixedly mounted on the synchronous belt, and a variable pitch module 7 is fixedly mounted on the lower end face of the slide table 602. When the drive motor 601 is turned on, the slide table 602 fixed on the synchronous belt can move stably with the synchronous belt, ensuring that the movement path of the ink head 9 from the ink application position to the printing position is precise and controllable, reducing problems such as character printing misalignment and blurring caused by ink head 9 offset, and ensuring neat and beautiful numbering.

[0039] The variable pitch module 7 includes a connector 701, a first cylinder 702, and a first motor 703. The top of the connector 701 is fixedly connected to the lower end face of the slide table 602. A guide rail 704 is provided along the length of the bottom of the connector 701. The first cylinder 702 is located on the guide rails 704 on both sides of the connector 701, and the piston rod of the first cylinder 702 extends downward and is fixedly connected to the guide rails 704. The first motor 703 is located on the side wall of the guide rail 704, and a second drive wheel is provided on the output shaft of the first motor 703. A bidirectional screw is horizontally arranged along its length. A second driven wheel is fixedly mounted on one end of the bidirectional screw near the second driving wheel. The other end of the bidirectional screw is rotatably connected to the inner wall of the guide rail 704 via a bearing. The bidirectional screw has two external threads with opposite directions. A belt is fitted onto the outer wall of the second driving wheel and the second driven wheel. Multiple sliders 705 are evenly distributed on the guide rail 704. The sliders 705 are adapted to the bidirectional screw and are slidably connected to the guide rail 704. The pads 9 are located on the corresponding sliders 705. When the first motor 703 drives the bidirectional screw to rotate via belt drive, the sliders 705 can move in opposite directions along the guide rail 704, thereby precisely adjusting the spacing between the pads 9. This solves the problem that existing pad printing machines cannot adjust the character spacing. It can adapt to the spacing of multiple steel plates 2 when ink is applied and can shrink the spacing of the pads 9 to a suitable size during printing, ensuring uniform spacing of numbers on the product.

[0040] The lead screw module 3 includes a lead screw motor 301, a mounting bracket 302, and a track 303. The lead screw motor 301 is fixedly mounted on the platform of the mounting table 1. A lead screw 304, arranged along the length of the steel plate 2, is fixedly mounted on the output shaft of the lead screw motor 301. A fixing plate 305 is provided at one end of the track 303 away from the lead screw motor 301. The other end of the lead screw 304 is rotatably connected to the fixing plate 305 through a bearing. The mounting bracket 302 is located between the steel plate 2 and the lead screw 304 and is fixedly connected to the steel plate 2. The lead screw 304 is sleeved with a... A sliding block 306 is adapted to the lead screw 304. The lower end face of the sliding block 306 is adapted to the track 303 and slidably connected to the track 303. The sliding block 306 is fixedly connected to the mounting bracket 302. A support seat 307 is provided between the steel plate 2 and the mounting bracket 302. The lead screw motor 301 can precisely control the rotation angle of the lead screw 304, thereby driving the steel plate 2 to move with millimeter-level precision in the horizontal direction. This ensures high character alignment when multiple steel plates 2 are combined for digital encoding, avoiding encoding misalignment caused by the offset of the steel plate 2.

[0041] The support base 307 is used to provide uniform support to the bottom of the steel plate 2, disperse the stress on the steel plate 2 during movement, and prevent the steel plate 2 from bending, tilting or other deformation problems due to its own weight or movement inertia, thereby improving the stability of the movement of the steel plate 2.

[0042] The ink scraping cylinder module 5 includes a second cylinder 501 and a placement seat 502. The placement seat 502 is located above the steel plate 2 and has multiple placement slots for placing ink cups 4. The piston rod of the second cylinder 501 is fixedly connected to the placement seat 502. When the second cylinder 501 drives the placement seat 502 to move, it can drive all the ink cups 4 to synchronously complete the ink scraping action along the surface of the steel plate 2, which greatly shortens the preparation time for a single coding print and makes the ink scraping of each ink cup 4 uniform, ensuring that the amount of ink remaining in the recessed characters of each steel plate 2 is consistent, thus ensuring the stability of printing quality. The placement slots are precisely matched with the dimensions of the ink cups 4, which can effectively limit the ink cups 4 and prevent the ink cups 4 from shaking or tipping over during the ink scraping process.

[0043] In a specific embodiment 2, such as Figure 6As shown, the difference between this embodiment and Embodiment 1 is that the ink cup 4 in this embodiment includes a cup body 401, a scraper 402, and a magnetic ring 403. The lower end face of the cup body 401 is provided with an annular mounting groove for accommodating the magnetic ring 403, and the lower end face of the magnetic ring 403 is flush with the lower end face of the cup body 401. The scraper 402 is fixedly installed at the lower end opening of the cup body 401, and the lower end face of the scraper 402 is slightly lower than the lower end face of the magnetic ring 403. The magnetic ring 403 can magnetically attract the ink cup 4 tightly to the surface of the steel plate 2, forming a reliable seal between the ink cup 4 and the steel plate 2. This effectively prevents ink from leaking out of the gaps when scraping or standing, reducing ink waste and preventing leaked ink from contaminating the surface of the steel plate 2. This ensures the purity of the ink in the recessed characters and improves the clarity of the printed characters. Furthermore, the scraper 402 can form a tight contact with the surface of the steel plate 2, accurately scraping away excess ink from the surface of the steel plate 2, leaving only a fixed amount of ink in the recessed characters.

[0044] In a specific embodiment 3, such as Figure 7 As shown, the difference between this embodiment and embodiments 1 and 2 is that an adjustment component 8 is provided between the slider 705 and the rubber head 9 in this embodiment. The adjustment component 8 includes an adjustment screw 801, a first nut 802, and a second nut 803. The lower end face of the slider 705 has a threaded hole that matches the upper end of the adjustment screw 801, and is locked and fixed by the first nut 802. The upper end face of the rubber head 9 has a connecting seat 804, which has a through hole that matches the lower end of the adjustment screw 801, and is locked and fixed by the second nut 803. By loosening the first nut 802 and the second nut 803, the extension length of the adjustment screw 801 can be adjusted vertically, thereby changing the distance between the rubber head 9 and the steel plate 2 and the workpiece surface. When dealing with recessed characters on steel plates 2 of different depths, the height of the rubber head 9 can be lowered to ensure that the rubber head 9 fully contacts the ink; when the workpiece is a convex curved surface or of different thickness, the height of the rubber head 9 can be finely adjusted to make the rubber head 9 fit tightly against the workpiece surface, avoiding insufficient ink application or blurry printing due to unsuitable height.

[0045] During operation, the workpiece to be printed is first placed on the workpiece placement position. Adjusting screws 801, first nut 802, and second nut 803 adjusts the height of each ink head 9. The ink cup 4 containing ink is then placed into the placement slot. Based on the number of digits in the digital code to be printed, the corresponding steel plate 2 is driven horizontally along the mounting platform 1 by the lead screw 304, causing the recessed characters on the steel plate 2 to form the initial code. The second cylinder 501 is then activated, and its piston rod pushes the placement seat 502 horizontally. 2. All ink cups 4 are slid synchronously along the corresponding steel plate 2 surface. During the sliding process, the scraper plate 402 at the bottom of the ink cup 4 scrapes off the excess ink on the surface of the steel plate 2, leaving only a certain amount of ink in the recessed characters. After the ink scraping is completed, the piston rod of the second cylinder 501 drives the placement seat 502 and ink cup 4 to return to their original positions. After the ink cup 4 returns to its original position, the first cylinder 702 is opened. The piston rod of the first cylinder 702 extends downward, driving the rubber head 9 to move down to directly above the recessed characters on the steel plate 2. The rubber head 9 makes full contact with the ink in the characters, completing the process of the rubber head 9 picking up the ink. After ink application, the piston rod of the first cylinder 702 retracts, causing the ink head 9 to return to its original position. After the ink head 9 returns to its original position, the drive motor 601 is started, driving the first driving wheel to rotate. Through synchronous belt transmission, the first driven wheel rotates synchronously, thereby driving the slide table 602 to move the lower ink head 9 from the ink application position directly above the steel plate 2 to the workpiece placement position on the side wall of the mounting table 1. During the movement, the first motor 703 is started, and its output shaft drives the second driving wheel to rotate. Through belt transmission, the second driven wheel drives the bidirectional screw to rotate. The oppositely oriented external threads on the bidirectional screw drive the slider 705 to move towards each other along the length of the guide rail 704. The ink head 9 retracts synchronously with the slider 705, reducing the distance between the ink heads 9. The spacing is adjusted to match the preset spacing of the code on the workpiece. At the same time, the lead screw module 3 automatically advances, driving the steel plate 2 to move according to the starting code and printing sequence, achieving a step-by-step progression every ten (e.g., if the current code is "A00001", after printing, the lead screw module 3 drives the steel plate 2 to combine to "A00002"), preparing for the next set of codes to pick up ink. When the slide table 602 drives the ink head 9 to the workpiece placement position, the drive motor 601 of the sliding module 6 stops, the ink head 9 is positioned directly above the area to be printed on the workpiece, the first cylinder 702 is started, its piston rod extends downward, driving the ink head 9 to move down to contact the surface of the workpiece, printing the character ink on the surface of the ink head 9 onto the workpiece, completing the printing of a set of codes. After printing is completed, the piston rod of the first cylinder 702 retracts, causing the ink head 9 to return to its original position and detach from the workpiece surface. After the ink head 9 returns to its original position, the drive motor 601 rotates in the opposite direction, driving the slide table 602, the variable pitch module 7, and the ink head 9 to move back from the workpiece placement position to the ink application position via the synchronous belt drive. During the return movement, the first motor 703 starts in the opposite direction, driving the bidirectional screw to rotate in the opposite direction, and the slider 705 moves in the opposite direction along the guide rail 704. The spacing of the ink head 9 returns from the retracted state to the initial open state, adapting to the spacing of the steel plate 2, ready for the next ink application.

[0046] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components, and can be direct connections or indirect connections through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0047] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all implementation methods here, and any obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A digitally coded variable distance pad printing apparatus, characterized by, The device includes a mounting platform on which multiple steel plates are arranged parallel to each other horizontally. The upper surface of each steel plate is engraved with recessed characters. A lead screw module is correspondingly installed between each steel plate and the mounting platform. The output end of the lead screw module is fixedly connected to the bottom of the steel plate, driving the steel plate to move horizontally to form different numerical codes. Each steel plate has an ink cup. A scraper cylinder module is located on one side of the mounting platform corresponding to the ink cup, used to push the ink cup to scrape ink. A rubber head adapted to the characters is located above each steel plate. A workpiece placement position is provided on the side wall of the mounting platform. A sliding module is also located above the mounting platform. The moving end of the sliding module is connected to the rubber head, driving the rubber head to reciprocate between the ink-dipping position directly above the steel plate and the printing position of the workpiece placement position, thereby achieving character dipping and printing.

2. The digitally coded variable-distance pad printing apparatus of claim 1, wherein, The sliding module includes a drive motor, a first driving wheel, and a first driven wheel. The output shaft of the drive motor is fixedly connected to the central shaft of the first driving wheel. The first driven wheel and the first driving wheel are arranged parallel to each other along the length of the mounting platform. A synchronous belt is sleeved on the outer wall of the first driving wheel and the first driven wheel. A slide is fixedly mounted on the synchronous belt. A variable pitch module is fixedly mounted on the lower end face of the slide.

3. The digitally coded variable-distance pad printing apparatus of claim 2, wherein, The variable pitch module includes a connector, a first cylinder, and a first motor. The top of the connector is fixedly connected to the lower end face of the slide table, and a guide rail is provided along the length direction at the bottom of the connector. The first cylinder is located on the guide rails on both sides of the connector, and the piston rod of the first cylinder extends downward and is fixedly connected to the guide rail. The first motor is located on the side wall of the guide rail, and a second driving wheel is provided on the output shaft of the first motor. A bidirectional screw is horizontally arranged inside the guide rail along its length direction. A second driven wheel is fixedly arranged at one end of the bidirectional screw near the second driving wheel, and the other end of the bidirectional screw is rotatably connected to the inner wall of the guide rail through a bearing. The rod of the bidirectional screw has two sections of external threads with opposite directions of rotation. A belt is sleeved on the outer wall of the second driving wheel and the second driven wheel. Multiple sliders are evenly distributed on the guide rail. The sliders are adapted to the bidirectional screws and are slidably connected to the guide rail. The rubber head is located on the corresponding slider.

4. The digitally coded variable-distance pad printing apparatus of claim 1, wherein, The lead screw module includes a lead screw motor, a mounting bracket, and a track. The lead screw motor is fixedly mounted on the platform of the mounting table. A lead screw arranged along the length of the steel plate is fixedly mounted on the output shaft of the lead screw motor. A fixing plate is provided at the end of the track away from the lead screw motor. The other end of the lead screw is rotatably connected to the fixing plate through a bearing. The mounting bracket is located between the steel plate and the lead screw and is fixedly connected to the steel plate. A sliding block adapted to the lead screw is sleeved on the lead screw. The lower end face of the sliding block is adapted to the track and is slidably connected to the track. The sliding block is fixedly connected to the mounting bracket. A support seat is provided between the steel plate and the mounting bracket.

5. The digitally coded variable-distance pad printing apparatus of claim 1, wherein, The ink scraper cylinder module includes a second cylinder and a placement seat. The placement seat is located above the steel plate and has multiple placement slots for placing ink cups. The piston rod of the second cylinder is fixedly connected to the placement seat.

6. The digitally coded variable-distance pad printing apparatus of claim 1, wherein, The ink cup includes a cup body, a scraper, and a magnetic ring. The lower end face of the cup body has an annular mounting groove for accommodating the magnetic ring, and the lower end face of the magnetic ring is flush with the lower end face of the cup body. The scraper is fixedly installed at the lower opening of the cup body, and the lower end face of the scraper is slightly lower than the lower end face of the magnetic ring.

7. The digital encoding variable-distance pad printing device as described in claim 3, characterized in that, An adjustment assembly is provided between the slider and the rubber head. The adjustment assembly includes an adjustment screw, a first nut, and a second nut. The lower end face of the slider has a threaded hole that matches the upper end of the adjustment screw and is locked in place by the first nut. The upper end face of the rubber head has a connecting seat with a through hole that matches the lower end of the adjustment screw and is locked in place by the second nut.

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