Printing rubber head and printing device

Abstract

The application relates to the technical field of printing equipment, and discloses a printing rubber head and a printing device, wherein the printing rubber head comprises a rubber head body, the rubber head body is internally provided with a storage chamber for storing ink; a printing contact surface of the rubber head body is provided with a group of fine holes in communication with the storage chamber, the group of fine holes is arranged to form a pattern shape to be printed; and a first gas hole of an externally-communicating gas supply device is arranged on one side of the rubber head body opposite to the printing contact surface. The printing rubber head is applied to the printing device, so that the working efficiency is improved, the printing effect is better, the yield is improved, and the service life of the rubber head body is prolonged. Moreover, the printing rubber head is applied to the printing device without the need of preparing an ink box and related structures, so that the structure of the printing device is simpler, the layout is more reasonable, and the structure is more compact.

Description

Technical Field

[0001] This application relates to the field of printing equipment technology, specifically to a printing pad and printing apparatus. Background Technology

[0002] 3D curved surface pad printing involves placing the product with a 3D curved surface to be printed in a fixture, then moving the 3D pad printing head to the ink-collecting station to pick up ink from the surface. After ink collection, the pad printing device moves directly above the product and presses down to perform the pad printing. Throughout the process, because the pad printing station and the ink-collecting station are separate, the pad printing head must repeatedly pick up ink, resulting in significant time waste and inaccurate printing accuracy due to the prolonged repetition.

[0003] Furthermore, due to the ink dispensing time at the ink dispensing station, the ink cartridge must be re-stirred and leveled after each ink dispensing by the 3D pad printing head, ensuring the removed ink is refilled. During this process, the ink is exposed to the air, and dust from the air mixes into the ink after each stirring. This dust is then printed onto the product surface, causing problems such as light leakage and poor texture. Summary of the Invention

[0004] The purpose of this application is to provide a printing pad and printing device to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, in a first aspect, this application provides a printing pad, comprising:

[0006] The ink cartridge body has a storage chamber inside for storing ink;

[0007] The printing contact surface of the printing head body is provided with a group of fine holes that connect to the storage chamber, and the group of fine holes is arranged to form the pattern to be printed; the side of the printing head body facing away from the printing contact surface is provided with a first air hole for an external air supply device.

[0008] As a further improvement to the above technical solution:

[0009] In conjunction with the first aspect, in one possible implementation, the group of fine holes has multiple small holes, which are initially closed, and when the air pressure in the storage chamber reaches a preset value, the small holes are switched to an open state.

[0010] In conjunction with the first aspect, in one possible implementation, the spacing between two adjacent micropores in the micropore group is 0.1 mm to 0.3 mm.

[0011] In conjunction with the first aspect, in one possible implementation, the aperture of the micropore is 0.005 mm to 0.018 mm.

[0012] In conjunction with the first aspect, in one possible implementation, the preset value is 1.2 Bar to 1.5 Bar.

[0013] In conjunction with the first aspect, in one possible implementation, the printing head further includes a stirring mechanism disposed on the head body;

[0014] The stirring mechanism is connected to an external stirring drive device at its connecting end, and the stirring end of the stirring mechanism extends into the storage chamber.

[0015] In conjunction with the first aspect, in one possible implementation, the stirring mechanism includes:

[0016] A stirrer is provided at the stirring end; and

[0017] The stirring rod is connected to the stirrer at one end and protrudes from the body of the rubber head at the other end.

[0018] The stirring rod and the rubber head body are sealed together.

[0019] In conjunction with the first aspect, in one possible implementation, the rubber head body has a through hole on the side facing away from the printing contact surface for the stirring mechanism to extend into, and a sealing element is provided at the through hole.

[0020] To achieve the above objectives, in a second aspect, this application also provides a printing apparatus, including a printing pad provided according to the first aspect.

[0021] As a further improvement to the above technical solution:

[0022] In conjunction with the second aspect, in one possible implementation, the printing head is disposed on the side of the first mold body near the second mold body, and the second mold body is provided with a positioning surface for positioning the product to be printed;

[0023] The second mold body is provided with a plurality of second air holes, which are distributed in the area where the positioning surface is located, and the other end of the second air hole (320) is connected to a negative pressure device.

[0024] In conjunction with the second aspect, in one possible implementation, the first mold body is provided with positioning guide posts, and the second mold body is provided with positioning guide holes that mate with the positioning guide posts; or...

[0025] The second mold body is provided with a positioning guide post, and the first mold body is provided with a positioning guide hole that cooperates with the positioning guide post.

[0026] Compared to existing technologies, the beneficial effects of this application are:

[0027] This application provides a printing head and a printing apparatus. The printing head stores printing ink in a storage chamber within its body. The pattern to be printed is formed by a group of fine holes arranged on the printing contact surface of the printing head body. When applied to a printing apparatus, during printing, an external air supply device pressurizes the storage chamber, causing the ink in the storage chamber to overflow through the fine holes and adhere to the printing contact surface of the printing head body. When the printing contact surface comes into contact with the product to be printed, the ink adhering to the printing contact surface is transferred to the product, completing the printing process.

[0028] Therefore, the printing pad and printing apparatus provided in this application have the following advantages compared to existing pad printing apparatuses:

[0029] 1) The printing process eliminates the need for repeated ink dipping at the pad printing station and ink dispensing station, saving time and energy and improving work efficiency;

[0030] 2) The printing head does not need to move back and forth between the pad printing station and the ink dispensing station, thereby reducing the accumulation of errors caused by movement and ensuring printing accuracy;

[0031] 3) In the prior art, when the pad printing head picks up ink, the force it experiences when pressing down and flattening the ink cartridge is 3000-5000Pa. The lifespan of the pad printing head is relatively short after long-term operation. However, the printing head in this application saves the ink picking process and extends its service life.

[0032] 4) This application eliminates the need for an ink dispensing station, ink cartridges, and related structures, resulting in a simpler, more rationally laid out, and more compact printing device structure.

[0033] 5) The ink is stored in the storage chamber of the printing head body, which is not connected to the outside air, thus avoiding dust, impurities and other contaminants from entering the ink, ensuring printing quality and improving the yield rate.

[0034] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate this application and form part of the specification. They are used together with the following detailed description to explain this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0036] Figure 1 This illustration shows a schematic diagram of a printing head without a stirrer according to an embodiment of this application;

[0037] Figure 2 This illustration shows a schematic diagram of a printing head equipped with a stirrer, according to an embodiment of this application.

[0038] Figure 3 This illustration shows a schematic diagram of the state structure of a printing head, a first mold, and a second mold in a printing apparatus provided in an embodiment of this application.

[0039] Figure 4 A cross-sectional view of the second model provided in an embodiment of this application is shown.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Printing nozzle; 110. Nozzle body; 111. Storage chamber; 112. Printing contact surface; 113. First air hole; 114. Group of fine holes; 114a. Small hole; 115. Air pipe; 116. Through hole; 120. Stirring mechanism; 121. Stirrer; 122. Stirring rod; 130. Seal;

[0042] 200. First mold body; 210. Positioning guide post;

[0043] 300, Second mold body; 310, Positioning surface; 320, Second air hole; 330, Positioning guide hole. Detailed Implementation

[0044] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the embodiments of this application.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0046] In the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 application and simplifying the description, and are not intended to 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 application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0050] Example

[0051] Please see Figure 1 This application provides a printing pad 100, and more particularly relates to a pad printing pad. The printing pad 100 can be used for printing on flat products and 3D curved products. The printing pad 100 includes a pad body 110, wherein the pad body 110 has a storage chamber 111 for storing ink.

[0052] The printing head body 110 has a printing contact surface 112 that contacts the product to be printed, and the printing contact surface 112 is made into a corresponding shape according to different products.

[0053] In this embodiment, the printing contact surface 112 of the printing head body 110 is provided with a group of fine holes 114 that communicate with the storage chamber 111, and the group of fine holes 114 are arranged to form the pattern shape to be printed.

[0054] The rubber head body 110 has a first air hole 113 for an external air supply device on the side facing away from the printing contact surface 112. The external air supply device can inflate and deflate the storage chamber 111 through the first air hole 113.

[0055] Furthermore, the number of first air holes 113 can be set to multiple, and is not specifically limited in this embodiment. The first air hole 113 is provided with an air pipe 115 connected to the air supply device.

[0056] Understandably, during printing, an external air supply device inflates the storage chamber 111 to create a positive pressure. Under this pressure, the ink in the storage chamber 111 overflows from the fine pore group 114 and adheres to the printing contact surface 112, thus forming the pattern to be printed. When the printing contact surface 112 comes into contact with the product, the ink adhering to the printing contact surface 112 is transferred to the product, achieving pattern transfer printing.

[0057] It should be noted that the micro-orifice group 114 contains multiple micro-orifices 114a. Since the micro-orifices 114a are typically small in diameter, and because the head body 110 is made of a soft material, in the initial state (when the air supply device has not filled the storage chamber 111 with air), the micro-orifices 114a are closed. Under the action of no external force, the ink will not overflow through the micro-orifices 114a. When the air pressure in the storage chamber 111 reaches a preset value, the micro-orifices 114a switch to the open state. When the printing contact surface 112 is not in contact with the product, the ink overflows through the micro-orifices 114a and adheres to the printing contact surface 112.

[0058] In this application, in order to meet the requirement that the small orifice 114a can be closed and opened under pressure regulation, generally, the material of the rubber head body 110 can be selected with good sealing performance, expansion under force and recovery under pressure. Optionally, the material of the rubber head body 110 can be, but is not limited to, silicone, rubber or other colloidal materials.

[0059] Meanwhile, considering that the viscosity of general pad printing ink is between 2000 and 5000 mPa·s, it is necessary to control the aperture of the fine orifice 114a to ensure that low-viscosity ink does not overflow through the fine orifice 114a without external force, and to ensure that the external pressure is not too great when high-viscosity ink flows through the aperture at a certain flow rate, so as not to affect the service life of the pad body 110.

[0060] Optionally, the pore size of the fine orifice 114a is 0.005 mm to 0.018 mm. If the pore size is less than 0.005 mm, high-viscosity ink will either have difficulty passing through under certain pressure or require increased external pressure to pass through. This inevitably leads to a shorter service life for the nozzle body 110 due to frequent shrinkage and deformation over a long period, because ink, as a polymer mixture, undergoes extrusion and expansion when passing through fine orifices, requiring a sharp increase in external force. Conversely, if the pore size of the fine orifice 114a is greater than 0.018 mm, low-viscosity ink will overflow through the fine orifice 114a without external force.

[0061] In some embodiments, the aperture of the fine hole 114a can be selected as any value among 0.005mm, 0.006mm, 0.008mm, 0.009mm, 0.01mm, 0.011mm, 0.012mm, 0.013mm, 0.014mm, 0.015mm, 0.016mm, 0.018mm, and 0.005mm to 0.018mm.

[0062] It should be understood that the above is only an example of the selection of the pore size of the fine holes 114a for general pad printing inks (viscosity between 2000 and 5000 mPa·s), and is not intended to limit the scope of protection of this application. The pore size range of the fine holes 114a in this application can be adjusted according to the viscosity of the ink.

[0063] In this embodiment, the spacing between adjacent micropores 114a in the micropore group 114 is 0.1 mm to 0.3 mm.

[0064] The distance between the fine holes 114a is 0.1mm to 0.3mm. If the distance between the holes is less than 0.1mm, the ink overflows and overlaps, exceeding the surface adsorption capacity of the pad body 110 (related to roughness), resulting in uneven thickness of the printed pattern (excess ink). If the distance between the holes is greater than 0.3mm, the overflowing ink does not intersect, resulting in blank areas after printing (partial unprinted areas). Therefore, by adjusting the layout of the fine holes 114a (hole spacing, arranged according to the shape of the printed pattern), the ink overflow can cover the printing contact surface 112 of the pad body 110 to form the pattern to be printed.

[0065] In some embodiments, the spacing between adjacent micropores 114a in the micropore group 114 is 0.1 mm to 0.2 mm.

[0066] Optionally, the spacing between adjacent micropores 114a in the micropore group 114 can also be selected as 0.11 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.17 mm, 0.18 mm, or 0.19 mm. It should be understood that the above is only an example of the spacing between adjacent micropores 114a in the micropore group 114 for general pad printing inks (viscosity between 2000 and 5000 mPa·s), and is not intended to limit the scope of protection of this application. The spacing between adjacent micropores 114a in the micropore group 114 of this application can be adjusted according to the viscosity of the ink.

[0067] In this embodiment, taking into account the pressure that the glue head body 110 can withstand, the service life of the glue head body 110, and the opening and closing state of the small hole 114a, the preset value of the air pressure in the storage chamber 111 is 1.2 Bar to 1.5 Bar. When the preset value of the air pressure in the storage chamber 111 is 1.2 Bar to 1.5 Bar, the small hole 114a is switched to the open state. That is to say, when the air supply device fills the storage chamber 111 with air pressure of 1.2 Bar to 1.5 Bar, the small hole 114a can be opened so that ink can overflow from the small hole 114a.

[0068] It should be noted that in this embodiment, the air supply device fills the storage chamber 111 with an air pressure of 1.2 Bar to 1.5 Bar, which can cause the inside of the printing head body 110 to be pressurized but the shape will not change significantly (within a controllable range). That is to say, at an air pressure of 1.2 Bar to 1.5 Bar, the internal pressure of the printing head body 110 increases and the small holes 114a open, but the body itself maintains an almost unchanged shape, thereby ensuring that the printed pattern is not deformed and the printing accuracy is controllable. When the air pressure in the storage chamber 111 exceeds 1.5 Bar, the printing head body will deform significantly and become uncontrollable, resulting in low pattern accuracy.

[0069] It should be noted that the preset air pressure in the storage chamber 111 is only an example for general pad printing ink (viscosity between 2000 and 5000 mPa·s), silicone for the pad body 110, and 0.005 mm to 0.018 mm for the pore diameter of the fine orifice 114a. It is not intended to limit the scope of protection of this application. The preset air pressure in the storage chamber 111 of this application can be adjusted according to the changes in ink viscosity, colloid material, and pore diameter of the fine orifice 114a.

[0070] Furthermore, the gas supplied to the storage chamber 111 by the gas supply device is pure gas to prevent impurities from entering and clogging the small holes 114a. Specifically, a filter is installed on the gas pipe 115 to filter the gas.

[0071] In some embodiments, a pressure sensor may be arranged in the storage chamber 111 or at the first air vent 113 to monitor the pressure of the storage chamber 111 in real time, so as to facilitate accurate control of the air pressure filled into the storage chamber 111.

[0072] Understandably, the amount of ink overflowing from the micro-orifice 114a in a single pass can be controlled based on the ink viscosity, the air pressure, the inflation time, the micro-orifice diameter, and the spacing between adjacent micro-orifices. Therefore, by controlling the amount of ink overflowing in a single pass, the ink thickness on the printing contact surface 112 can be controlled. For example, the maximum thickness for a single pad printing pass is 0.005-0.01 mm; thus, by repeating the pad printing process multiple times and baking the product, a thicker pad printing pattern can be obtained. After use, the pressure on the pad body 110 is released, the storage chamber 111 returns to normal pressure (initial state), and the micro-orifice 114a automatically closes.

[0073] To better illustrate the pad printing effect of the printing pad provided in this application, examples will be given below. Please refer to the table below for details.

[0074]

[0075] The experimental results in the table above show that, under the condition that the ink viscosity, the diameter of the fine holes, the spacing between adjacent fine holes, and the preset pressure are all constant, the thickness of the overflowing ink can be controlled by controlling the ventilation time. Generally, ventilation is divided into three stages. In the first stage, the air pressure inside the storage chamber 111 is the same as the outside air pressure. At this time, ventilation is introduced, and the air pressure inside the storage chamber 111 gradually increases until it reaches the preset value. In order to maintain its shape, the pad head body 110 opens the fine hole 114a, and the ink will overflow rapidly in a relatively large amount due to the sudden pressure difference. In the second stage, ventilation continues until the ventilation and ink overflow reach equilibrium. At this time, the ink overflow is uniform, the overflow amount is uniform, and the thickness of the pad-printed ink increases regularly. In the third stage, the ventilation is stopped to ensure that the thickness of the overflowing ink reaches the required thickness of 0.01mm. At this time, the fine hole 114a is closed, and the ink no longer overflows.

[0076] Under normal circumstances, while taking into account both the printing effect and printing efficiency, the ventilation time should be controlled to be 3 to 6 seconds.

[0077] Please see Figure 2 Furthermore, the printing head 100 provided in this embodiment also includes a stirring mechanism 120 disposed on the head body 110. The head body 110 has a through hole 116 on the side facing away from the printing contact surface 112, into which the stirring mechanism 120 extends. The connecting end of the stirring mechanism 120 is used to connect an external stirring drive device, and the stirring end of the stirring mechanism 120 extends into the storage chamber 111 through the through hole 116. To ensure the airtightness of the storage chamber 111, a sealing element 130 is provided at the through hole 116 of the stirring mechanism 120, ensuring a seal between the head body 110 and the stirring mechanism 120, preventing air leakage when the storage chamber 111 is pressurized, and protecting the ink from contamination.

[0078] Specifically, the stirring mechanism 120 includes a stirrer 121 and a stirring rod 122 disposed at the stirring end. One end of the stirring rod 122 is connected to the stirrer 121, and the other end protrudes from the nozzle body 110 through the through hole 116. The stirring rod 122 and the nozzle body 110 are sealed together by a seal 130, and the end of the stirring rod 122 away from the stirrer 121 is used to connect an external stirring drive device.

[0079] Alternatively, the stirring drive can be a motor or a rotary cylinder.

[0080] Understandably, before pad printing, the stirring mechanism 120 can be used to stir the ink evenly, breaking up any clumps and sediments. Furthermore, for inks that are prone to clumping or are unstable, the stirring drive can be activated to continuously or intermittently stir the ink.

[0081] Please see Figure 1 , Figure 2 and Figure 3 Furthermore, this embodiment also provides a printing apparatus, and more particularly relates to a pad printing apparatus. In this embodiment, the printing apparatus includes the printing pad 100 provided above.

[0082] The printing apparatus also includes a first mold 200 and a second mold 300 arranged in alignment. The first mold 200 and the second mold 300 can perform mold closing and mold opening actions under the drive of the driving device. When the mold is closed, the first mold 200 and the second mold 300 move closer to each other; when the mold is opened, the first mold 200 and the second mold 300 move further apart.

[0083] Please refer to the following: Figure 4 The printing head 100 is located on the side of the first mold 200 near the second mold 300. The second mold 300 is provided with a positioning surface 310 for positioning the product to be printed. The positioning surface 310 can be a concave curved surface or a convex curved surface, or a 3D curved surface with a concave-convex structure. The specific setting depends on the shape of the product and is not specifically limited in this embodiment.

[0084] Understandably, when printing is required, the product is first positioned on the positioning surface 310, and then air is supplied to the storage chamber 111 through the air supply device, so that the printing contact surface 112 of the printing head body 110 forms the shape of the pattern to be printed. Then, the first mold 200 and the second mold 300 are directly controlled to move closer to each other to close the mold. After printing is completed, the first mold 200 and the second mold 300 are controlled to open the mold, and the pressure in the storage chamber 111 is released at the same time.

[0085] Please see Figure 3 and Figure 4Furthermore, the second mold body 300 is provided with multiple second air holes 320, one end of which is distributed within the area where the positioning surface 310 is located. Each second air hole 320 is externally connected to a negative pressure device. The negative pressure device can extract air from the second air holes 320, creating a negative pressure between the positioning surface 310 and the product to attract and position the product on the second mold body 300, preventing product displacement during printing and ensuring the quality of the printed pattern.

[0086] Optionally, the negative pressure provided by the negative pressure device can be adjusted from 0.1MPa to 1.2MPa depending on the product size.

[0087] In some embodiments, the first mold body 200 is provided with a positioning guide post 210, and the second mold body 300 is provided with a positioning guide hole 330 that cooperates with the positioning guide post 210.

[0088] In some other embodiments, the second mold 300 is provided with a positioning guide post 210, and the first mold 200 is provided with a positioning guide hole 330 that cooperates with the positioning guide post 210.

[0089] Understandably, when the first mold 200 and the second mold 300 come together to close the mold, the positioning guide post 210 is first inserted into the corresponding positioning guide hole 330 to provide positioning guidance for the first mold 200 and the second mold 300 to come together, thereby preventing the first mold 200 and the second mold 300 from shifting.

[0090] Optionally, the assembly gap between the positioning guide post 210 and the positioning guide hole 330 is 0.005mm, which is less than the tolerance gap of the pad printing pattern specified in the product. This ensures that the pad printing pattern does not shift, the inspection does not exceed the tolerance of the product drawing, and guarantees printing quality.

[0091] In some embodiments, the printing apparatus further includes the negative pressure device, the air supply device, and the stirring drive device. For example, the negative pressure device may be equipped with an air pump to draw air. The air supply device may be equipped with an air pump to supply air.

[0092] Please see Figures 1 to 4 This embodiment also provides a printing method based on the above-described printing apparatus, the steps of which include:

[0093] S100: The product to be printed is placed on the positioning surface 310 of the second mold 300 and fixed by adsorption using a negative pressure device;

[0094] S200: Gas at a preset pressure is introduced into the storage chamber 111, and the inflation time is controlled so that the ink overflows and forms the pattern shape to be printed on the printing contact surface 112.

[0095] S300: Controls the closing of the first mold body 200 and the second mold body 300;

[0096] S400: Controls the opening of the first mold body 200 and the second mold body 300, and controls the depressurization and negative pressure devices in the storage chamber 111 to stop working;

[0097] S500: Remove the printed product and continue with step S100 above.

[0098] It should be noted that during the above printing process, the ink can be stirred according to its characteristics. Furthermore, in step S300, the printing contact surface 112 of the printing head body 110 is in contact with the product during mold closing. That is to say, the outlet of the small hole 114a is blocked by the product. At this time, even if there is pressure between the printing head and the product, the ink will not overflow from the small hole 114a.

[0099] In some embodiments, depending on the characteristics of the product to be printed, after the mold is closed in step S300, gas can continue to be injected into the storage chamber 111 of the printing head body 110, so that the printing head body 110 deforms and fully fits the product, ensuring printing quality.

[0100] Compared with the prior art, the printing apparatus provided in this embodiment has the following advantages:

[0101] 1) Existing pad printing devices include a pad printing station and an ink-collecting station, with a certain distance between the two stations. During the printing process, the pad printing head needs to be driven to repeatedly dip into ink between the pad printing station and the ink-collecting station. In this embodiment, the action of repeatedly dipping ink between the pad printing station and the ink-collecting station is eliminated during the printing process, saving time and energy and improving work efficiency.

[0102] 2) In the prior art, the reciprocating movement of the pad printing head between the pad printing station and the ink dispensing station usually requires a transmission mechanism. This transmission mechanism wears down over time, easily leading to error accumulation and inaccurate printing. In this embodiment, however, the printing head 100 does not need to reciprocate between the pad printing station and the ink dispensing station, thus reducing error accumulation caused by movement and ensuring printing accuracy.

[0103] 3) In the prior art, the pad printing head experiences a force of 3000-5000 Pa when pressing down to flatten the ink cartridge during ink dispensing, resulting in a short lifespan for pad printing heads under long-term operation. However, the printing head 100 in this application eliminates the ink dispensing process and does not need to withstand the pressure of flattening with the ink cartridge, thus extending its service life.

[0104] 4) This application eliminates the need for an ink dispensing station, ink cartridges, and related structures, resulting in a simpler, more rationally laid out, and more compact printing device.

[0105] 5) The ink is stored in the storage chamber 111 of the printing head body 110. When in use, it overflows from the storage chamber 111 through the small hole 114a. It is not connected to the outside air throughout the process, thus avoiding dust, impurities and other contaminants from entering the ink. This ensures printing quality and improves the yield rate (avoiding problems such as light leakage and poor embossing in product printing).

[0106] 6) Positioning guide post 210 and positioning guide hole 330 are added between the first mold body 200 and the second mold body 300 to provide positioning and guiding functions; and the positioning surface 310 is added to provide suction function to adsorb and fix the product, so as to achieve precise positioning and prevent the glue head body 110 or the product from being misaligned during the pad printing process.

[0107] The optional embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present application are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present application, various simple modifications can be made to the technical solutions of the embodiments of the present application, and these simple modifications all fall within the protection scope of the embodiments of the present application.

[0108] Furthermore, various different implementation methods of the embodiments of this application can be combined arbitrarily, as long as they do not violate the spirit of the embodiments of this application, they should also be regarded as the content disclosed in the embodiments of this application.

Claims

1. A printing pad, characterized in that, include: The ink head body (110) has a storage chamber (111) for storing ink. A stirring mechanism (120) is provided on the rubber head body (110). The printing contact surface (112) of the printing head body (110) is provided with a group of fine holes (114) that connect to the storage chamber (111). The group of fine holes (114) is arranged to form the pattern to be printed. The printing head body (110) is provided with a first air hole (113) for an external air supply device on the side facing away from the printing contact surface (112). The group of fine holes (114) has a plurality of small holes (114a). In the initial state, the small holes (114a) are closed. When the air pressure in the storage chamber (111) reaches a preset value, the small holes (114a) are converted to open state, so that the ink overflows through the small holes (114a) and adheres to the printing contact surface (112).

2. The printing head according to claim 1, characterized in that, The spacing between two adjacent micropores (114a) in the micropore group (114) is 0.1 mm to 0.3 mm.

3. The printing head according to claim 1, characterized in that, The diameter of the fine hole (114a) is 0.005mm to 0.018mm.

4. The printing head according to claim 1, characterized in that, The preset value is 1.2 Bar to 1.5 Bar.

5. The printing pad according to any one of claims 1-4, characterized in that, The stirring mechanism (120) is connected to an external stirring drive device at its connection end, and the stirring end of the stirring mechanism (120) extends into the storage chamber (111).

6. The printing head according to claim 5, characterized in that, The stirring mechanism (120) includes: A stirrer (121) is provided at the stirring end; and The stirring rod (122) is connected to the stirrer (121) at one end and exposed outside the head body (110) at the other end; The stirring rod (122) and the rubber head body (110) are sealed together.

7. The printing head according to claim 5, characterized in that, The rubber head body (110) has a through hole (116) on the side facing away from the printing contact surface (112) for the stirring mechanism (120) to extend into, and a sealing element (130) is provided at the through hole (116).

8. A printing apparatus, characterized in that, Includes the printing pad according to any one of claims 1-7.

9. The printing apparatus according to claim 8, characterized in that, The printing apparatus further includes a first mold (200) and a second mold (300) arranged in alignment. The printing head (100) is disposed on the side of the first mold (200) close to the second mold (300), and the second mold (300) is provided with a positioning surface (310) for positioning the product to be printed. The second mold body (300) is provided with a plurality of second air holes (320), one end of the plurality of second air holes (320) is distributed in the area where the positioning surface (310) is located, and the other end of the second air hole (320) is connected to a negative pressure device.

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