A plastic part pad printer

Abstract

The utility model discloses a kind of plastic parts pad printing machine, it is related to the technical field of pad printing machine, including machine body, the top of the machine body is equipped with machine base, pad printing mechanism is installed on the machine base, ink storage box is installed on the machine body, the side of the machine body is equipped with placing mechanism. The utility model is installed when scraping ink knife, only need to place blade between pressing plate and fixed cavity, push into pressing plate, the reverse taper of compression joint can be automatically locked pressing plate under the action of spring, realize the reliable fixing of scraping ink knife. Reverse operation can be carried out when disassembling, the whole process does not need to use additional tool, thereby simplifying the replacement and maintenance process of scraping ink knife, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of pad printing machines, and more particularly to a pad printing machine for plastic parts. Background Technology

[0002] Pad printing, as an important method for printing patterns on curved surfaces, is widely used for printing patterns on irregularly shaped workpieces such as plastics, metals, and glass. Its basic principle is to use a flexible silicone pad printing head to pick up ink from a steel plate engraved with a pattern and then transfer it to the surface of the workpiece. A typical pad printing machine usually includes core components such as a pad printing mechanism, an ink supply (or ink storage) system, and a workpiece positioning fixture.

[0003] In existing technologies, to improve printing efficiency and adaptability, technicians have made numerous improvements to the structure of pad printing machines. For example, Chinese Patent Publication No. CN 213618947 U discloses a pad printing machine for plastic parts, which includes an operating table, a pad printing mechanism, and an ink-filling mechanism. This solution aims to reduce ink evaporation during production, improve the working environment, and increase work efficiency by setting an ink-storing block and a magnetic ring at the lower end of the ink cup.

[0004] However, the existing technologies described above reveal the following problems that need to be addressed: The doctor blade is a core, easily damaged component in pad printing machines, requiring regular replacement or maintenance to ensure ink scraping quality. Traditional doctor blades are often fixed using multiple bolts for direct clamping. Replacement requires tightening and loosening each bolt individually with tools, a cumbersome and time-consuming process that impacts production efficiency. Furthermore, ensuring uniform pressure during reinstallation can affect the scraping effect. For plastic parts of varying heights or shapes, frequent adjustments to the workpiece's height relative to the printing head are necessary. Common adjustment methods include adding or removing shims under the workpiece clamp or manually adjusting a screw with a locking mechanism. The former has low precision and efficiency, while the latter is not intuitive and may shift due to insecure locking, affecting positioning consistency during mass production. Utility Model Content

[0005] The purpose of this utility model is to provide a plastic part pad printing machine in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: it includes a body, a base is installed on the top of the body, a pad printing mechanism is installed on the base, an ink storage cartridge is installed on the body, and a placement mechanism is installed on one side of the body;

[0007] The pad printing mechanism includes a cylinder installed inside the machine base. A movable plate is fixedly connected to the telescopic end of the cylinder. A limit rod is slidably connected to the movable plate. A telescopic cylinder is fixedly connected to one side of the limit rod. A rubber pad printing head is fixedly connected to the telescopic end of the telescopic cylinder. A doctor blade assembly is installed on the rear side of the rubber pad printing head. The doctor blade assembly is fixedly connected to one side of the movable plate. The doctor blade assembly includes a fixed cavity. A pressure plate is provided on the front side of the fixed cavity. A doctor blade is pressed on the pressure plate. A placement cavity is opened at one end of the fixed cavity. A nut tube is connected through the pressure plate and the fixed cavity. A crimping connector is fixedly connected to one end of the nut tube. A bolt head is provided inside the placement cavity. A bolt is fixedly connected to one side of the bolt head. A spring is sleeved on the bolt. One end of the spring abuts against the bolt head of the bolt, and the other end abuts against the inner wall of the placement cavity. The bolt is screwed into the nut tube.

[0008] In practical applications, when installing the doctor blade, simply place the blade between the pressure plate and the fixing cavity, push in the pressure plate, and the inverted conical surface of the pressure connector will automatically lock the pressure plate under the action of the spring, thus reliably fixing the doctor blade. Disassembly is performed by reversing the operation. The entire process requires no additional tools, thereby simplifying the replacement and maintenance process of the doctor blade and improving production efficiency.

[0009] Furthermore, the placement mechanism includes a connecting plate, which is fixedly connected to one side of the machine body. A limiting plate is fixedly connected to the surface of the connecting plate, and a connecting block is fixedly connected to the bottom side of the connecting plate. A movable plate is movably connected to the surface of the limiting plate. A sliding groove is provided on the rear side of the movable plate, and the sliding groove is slidably connected to the limiting plate. A workpiece placement seat is fixedly connected to the top of the movable plate. A threaded post is threadedly connected to the inside of the workpiece placement seat. The threaded post is threadedly connected to the connecting block, and a rotating disk is fixedly connected to the threaded post. The rotating disk is located on the upper side of the connecting block.

[0010] In practical applications, a spiral lifting mechanism is formed by a rotating disk, threaded column, connecting block, and workpiece placement seat. Operators can precisely drive the workpiece placement seat and the workpiece fixed on it to move vertically along the limiting plate by manually rotating the rotating disk. The guiding effect of the sliding groove ensures the stability of the lifting process. This facilitates the adjustment of the printing position for plastic parts of different heights, shortens the preparation time during product changeovers, lowers the skill threshold for operators, and ensures the repeatability of workpiece positioning in mass production.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] When installing the doctor blade, simply place the blade between the pressure plate and the fixing cavity, push in the pressure plate, and the inverted conical surface of the pressure connector will automatically lock the pressure plate under the action of the spring, thus reliably fixing the doctor blade. Disassembly is done by simply reversing the operation. The entire process requires no additional tools, thereby simplifying the replacement and maintenance process of the doctor blade and improving production efficiency.

[0013] A spiral lifting mechanism is formed by a rotating disk, threaded column, connecting block, and workpiece placement seat. Operators can precisely drive the workpiece placement seat and the workpiece fixed on it to move vertically along the limiting plate by manually rotating the rotating disk. The guiding effect of the sliding groove ensures the stability of the lifting process. This facilitates the adjustment of the printing position for plastic parts of different heights, shortens the preparation time during product changeovers, lowers the skill threshold for operators, and ensures the repeatability of workpiece positioning in mass production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure proposed in this utility model;

[0015] Figure 2 This is a schematic diagram of the pad printing mechanism proposed in this utility model;

[0016] Figure 3 This is a schematic diagram of the doctor blade structure proposed in this utility model;

[0017] Figure 4 This is a schematic diagram of the ink scraping assembly structure proposed in this utility model;

[0018] Figure 5 This is a schematic diagram of the placement mechanism proposed in this utility model.

[0019] In the diagram: 1. Machine body; 2. Machine base; 3. Pad printing mechanism; 30. Cylinder; 31. Limiting rod; 32. Moving plate; 33. Telescopic cylinder; 34. Rubber pad printing head; 35. Doctor blade assembly; 350. Fixed cavity; 351. Pressure plate; 352. Doctor blade; 353. Nut tube; 354. Placement cavity; 355. Bolt; 356. Spring; 357. Bolt head; 358. Press joint; 4. Ink cartridge; 5. Placement mechanism; 50. Connecting plate; 51. Limiting plate; 52. Moving plate; 53. Connecting block; 54. Threaded column; 55. Rotating disk; 56. Sliding groove; 57. Workpiece placement seat. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0022] Reference Figure 1-5 A plastic parts pad printing machine includes a body 1, a base 2 installed on the top of the body 1, a pad printing mechanism 3 installed on the base 2, an ink storage cartridge 4 installed on the body 1, and a placement mechanism 5 installed on one side of the body 1.

[0023] The pad printing mechanism 3 includes a cylinder 30, which is installed inside the base 2. A movable plate 32 is fixedly connected to the telescopic end of the cylinder 30. A limit rod 31 is slidably connected to the movable plate 32. A telescopic cylinder 33 is fixedly connected to one side of the limit rod 31. A rubber pad printing head 34 is fixedly connected to the telescopic end of the telescopic cylinder 33. A doctor blade assembly 35 is installed on the rear side of the rubber pad printing head 34. The doctor blade assembly 35 is fixedly connected to one side of the movable plate 32. The doctor blade assembly 35 includes a fixed cavity 350. A pressure plate 351 is provided on the front side of the fixed cavity 350. The device includes a doctor blade 352, a placement cavity 354 at one end of a fixed cavity 350, a nut tube 353 that is connected through the pressure plate 351 and the fixed cavity 350, a crimping connector 358 that is fixedly connected to one end of the nut tube 353, a bolt head 357 that is provided inside the placement cavity 354, a bolt 355 that is fixedly connected to one side of the bolt head 357, a spring 356 that is sleeved on the bolt 355, one end of the spring 356 abutting against the bolt head 357 of the bolt 355, and the other end abutting against the inner wall of the placement cavity 354, and the bolt 355 is screwed into the nut tube 353.

[0024] In practical applications, the operator places the plastic workpiece to be printed on the workpiece placement seat 57 and adjusts it to the appropriate printing position using the placement mechanism 5. After starting the equipment, the pad printing mechanism 3 begins to work. The cylinder 30 drives the moving plate 32 and the entire assembly mounted on it, including the rubber pad printing head 34 and the doctor blade assembly 35, to move forward toward the steel plate, as shown on the left side of the figure. At this time, the doctor blade 352 at the bottom of the doctor blade assembly 35 first contacts and scrapes across the ink-coated ink reservoir 4, usually located inside the machine below the doctor blade's stroke, removing the ink from the non-image areas on the surface of the steel plate inside the ink reservoir 4 (not shown in the figure), leaving only the ink in the recessed image areas. Subsequently, the rubber pad printing head 34 moves downward under the drive of the telescopic cylinder 33, pressing against the steel plate inside the ink reservoir 6 and picking up the ink. Then, the telescopic cylinder 33 retracts, and the cylinder 30 drives the entire pad printing mechanism to move backward and laterally above the workpiece. The telescopic cylinder 33 then extends again, driving the rubber pad printing head 34 to precisely press the pattern onto the surface of the plastic workpiece. After printing is completed, all actuators reset, ready for the next cycle.

[0025] When the doctor blade 352 needs to be installed, first place the doctor blade 352 in the joint between the pressure plate 351 and the fixed cavity 350. Then, push the pressure plate 351 into the nut tube 353. During the pushing process, the radial force of the pressure plate 351 acts on the inverted conical surface of the crimping joint 358, causing the nut tube 353 to be slightly lifted against the elastic force of the spring 356. After the pressure plate 351 is fully pushed in, the crimping joint 358 can apply a downward pressure to the pressure plate 351 under the elastic force of the spring 356, so that the doctor blade 352 is clamped between the pressure plate 351 and the fixed cavity 350.

[0026] Reference Figure 1-5 Furthermore, the placement mechanism 5 includes a connecting plate 50, which is fixedly connected to one side of the machine body 1. A limiting plate 51 is fixedly connected to the surface of the connecting plate 50, and a connecting block 53 is fixedly connected to the bottom side of the connecting plate 50. A movable plate 52 is movably connected to the surface of the limiting plate 51. A sliding groove 56 is provided on the rear side of the movable plate 52, and the sliding groove 56 is slidably connected to the limiting plate 51. A workpiece placement seat 57 is fixedly connected to the top of the movable plate 52. A threaded post 54 is threadedly connected to the inside of the workpiece placement seat 57. The threaded post 54 is threadedly connected to the connecting block 53. A rotating disk 55 is fixedly connected to the threaded post 54, and the rotating disk 55 is located on the upper side of the connecting block 53.

[0027] In practical applications, the workpiece placement seat 57 is connected to the limiting plate 51 via a movable plate 52. The movable plate 52 can slide up and down along the limiting plate 51 via a sliding groove 56. The specific driving method is as follows: rotating the rotating disk 55 drives the threaded column 54 fixed thereto to rotate. Since the threaded column 54 simultaneously forms a spiral lifting mechanism with the connecting block 53 and the internal threads of the workpiece placement seat 57, when the threaded column 54 rotates, it generates axial displacement, thereby pushing or pulling the workpiece placement seat 57 and the movable plate 52 as a whole to precisely rise or fall along the sliding groove 56 of the limiting plate 51.

[0028] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A pad printing machine for plastic parts, characterized in that, Includes a body (1), a base (2) is installed on the top of the body (1), a pad printing mechanism (3) is installed on the base (2), an ink storage cartridge (4) is installed on the body (1), and a placement mechanism (5) is installed on one side of the body (1). The pad printing mechanism (3) includes a cylinder (30), which is installed inside the base (2). A movable plate (32) is fixedly connected to the telescopic end of the cylinder (30). A limit rod (31) is slidably connected on the movable plate (32). A telescopic cylinder (33) is fixedly connected to one side of the limit rod (31). A rubber pad printing head (34) is fixedly connected to the telescopic end of the telescopic cylinder (33). A doctoring assembly (35) is installed on the rear side of the rubber pad printing head (34). The doctoring assembly (35) is fixedly connected to one side of the movable plate (32).

2. The pad printing machine for plastic parts according to claim 1, characterized in that, The ink scraping assembly (35) includes a fixed cavity (350), a pressure plate (351) is provided on the front side of the fixed cavity (350), an ink scraper (352) is pressed on the pressure plate (351), and a placement cavity (354) is opened at one end of the fixed cavity (350).

3. A pad printing machine for plastic parts according to claim 2, characterized in that, A nut tube (353) is connected through the pressure plate (351) and the fixed cavity (350). A crimp connector (358) is fixedly connected to one end of the nut tube (353). A bolt head (357) is provided inside the placement cavity (354). A bolt (355) is fixedly connected to one side of the bolt head (357). A spring (356) is sleeved on the bolt (355). One end of the spring (356) abuts against the bolt head (357) of the bolt (355), and the other end abuts against the inner wall of the placement cavity (354). The bolt (355) is screwed into the nut tube (353).

4. A pad printing machine for plastic parts according to claim 1, characterized in that, The placement mechanism (5) includes a connecting plate (50), which is fixedly connected to one side of the body (1). A limiting plate (51) is fixedly connected to the surface of the connecting plate (50), and a connecting block (53) is fixedly connected to the bottom side of the connecting plate (50).

5. A pad printing machine for plastic parts according to claim 4, characterized in that, The surface of the limiting plate (51) is movably connected to a movable plate (52), and a sliding groove (56) is provided on the rear side of the movable plate (52). The sliding groove (56) is slidably connected to the limiting plate (51), and a workpiece placement seat (57) is fixedly connected to the top of the movable plate (52).

6. A pad printing machine for plastic parts according to claim 5, characterized in that, The workpiece placement seat (57) has a threaded post (54) internally threaded, the threaded post (54) is threaded onto the connecting block (53), and a rotating disk (55) is fixedly connected to the threaded post (54), the rotating disk (55) is located on the upper side of the connecting block (53).

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