Transfer printing rubber head and transfer printing equipment
By designing an eccentric pad printing head, apex off-axis and a properly arranged exhaust hole, the problem of low pad printing yield on 3D surfaces in traditional pad printing equipment is solved, and high-quality printing effect is achieved, suitable for 2D and 3D surfaces.
Patent Information
- Application Number
- CN202422324621.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Traditional pad printing equipment has low pad printing yield on 3D surfaces, which is difficult to meet production needs. It is mainly due to the large difference in the degree of deformation near the apex and other parts, resulting in printing pattern defects such as local ink deficiency, light transmission, pattern distortion, etc.
A pad printing head is designed, the apex of the end head deviates from the axis, the exhaust hole is located in the invalid printing area, the radial size of the end head is gradually reduced, and the parts near the apex do not participate in effective printing. Through the eccentric design and the reasonable layout of the exhaust hole, the deformation impact is reduced and the printing quality is improved.
The pad-print yield is improved and the impact of bubbles on printing quality is reduced. The printing appearance yield can reach more than 98%, adapting to the printing needs of 2D and 3D surfaces.
Smart Images
Figure CN223116044U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pad printing heads, and particularly to a pad printing head and a pad printing device. Background Art
[0002] Pad printing technology is widely used in various electronic products, such as wearable devices like watches or electronic devices like smartphones. During the production process of electronic products, pad printing equipment is usually used to print ink patterns in the printing area to enhance the appearance competitiveness of electronic products. With the rapid development of electronic products, the surfaces of some electronic products are no longer limited to two-dimensional planes, and there may be 3D surfaces such as double-curved surfaces and four-curved surfaces. The pad printing yield of traditional pad printing equipment for 3D surfaces is low, making it difficult to meet production requirements. Summary of the Utility Model
[0003] Based on this, in view of the problem of low pad printing yield of traditional pad printing equipment for 3D surfaces, it is necessary to provide a pad printing head and a pad printing device.
[0004] A pad printing head includes:
[0005] A substrate; and
[0006] A pad head body, including a main body part provided on the substrate and a tip part connected to the main body part. At least part of the radial dimension of the tip part gradually decreases in the direction from the substrate to the main body part. The main body part has an axis, and the vertex of the tip part deviates from the axis.
[0007] For the above pad printing head, the shape of the pad head body is designed such that the vertex of the tip part deviates from the axis. When using the pad printing head for pad printing, it is easier to set the vertex in the ineffective printing area, so that the parts near the vertex with a greater degree of stress do not participate in the printing operation of the effective printing area, which can avoid defects in the printed pattern caused by different deformation degrees between the parts near the vertex and other parts, and is beneficial to improving the pad printing yield.
[0008] In one embodiment, the tip part is provided with an exhaust hole, and the position of the exhaust hole corresponds to the vertex of the tip part.
[0009] In one embodiment, part of the main body part and part of the tip part correspond to the effective printing area, and the vertex of the tip part corresponds to the ineffective printing area.
[0010] In one embodiment, the main body part is a rotating body around the axis, the tip part is provided on the side of the main body part facing away from the substrate, and the shape and size at the connection between the main body part and the tip part are adapted to each other.
[0011] In one embodiment, the end head includes a connecting portion and a conical portion. The connecting portion is connected to the main body portion and is adapted to the end of the main body portion away from the substrate. The conical portion is connected to the side of the connecting portion facing away from the main body portion.
[0012] In one embodiment, the radial dimension of the main body portion gradually decreases in the direction from the substrate towards the main body portion.
[0013] In one embodiment, the conical portion is generally in the shape of an eccentric cone; and / or,
[0014] the main body portion is generally in the shape of a frustum of a cone.
[0015] In one embodiment, the end head has a first cross-section. The first cross-section passes through the vertex and is parallel to the line connecting the vertex and the axis. The first cross-section has an intersecting first side and second side. The intersection of the first side and the second side corresponds to the vertex. The angle between the first side and the second side is 100° - 170°.
[0016] In one embodiment, the end head has a second cross-section perpendicular to the first cross-section. The second cross-section divides the end head into a first part and a second part. The axis passes through the first part. The area of the outer surface of the first part is larger than the area of the outer surface of the second part.
[0017] A pad printing device includes a pad printing rubber head as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 are schematic structural diagrams of a pad printing rubber head in some embodiments.
[0019] Figure 2 For Figure 1 a schematic structural diagram of the pad printing rubber head shown from another angle.
[0020] Figure 3 For Figure 1 a schematic structural diagram of the pad printing rubber head shown from yet another angle.
[0021] Figure 4 For Figure 3 a schematic cross-sectional view of the pad printing rubber head in the A - A direction of the pad printing rubber head shown.
[0022] Reference Numerals:
[0023] 10. Pad printing rubber head; 11. Substrate; 12. Rubber head body; 121. Main body part; 1211. Axis; 122. End head part; 1221. Connection part; 1222. Conical part; 1223. Vertex; 1224. Exhaust hole; 1225. First side; 1226. Second side. Detailed implementation manners
[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0025] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.
[0026] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0027] In the present application, unless otherwise clearly specified and limited, if there are terms such as "installation", "connection", "connection", "fixation", etc., these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0028] In this application, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or similar descriptions, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.
[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.
[0030] For a traditional pad printing rubber head, the vertex of the end head is usually set corresponding to the axis of the main body, which is a non-eccentric design, and the exhaust hole is provided at the vertex of the end head. When pad printing is performed using the pad printing rubber head, the axis of the main body usually needs to correspond to the effective printing area, that is, the vertex and the exhaust hole are both located in the effective printing area. Since the vertex is the farthest from the substrate, the force received at the vertex is the greatest during pad printing, and there is a large difference in the degree of deformation between the vicinity of the vertex and other parts, which affects the exhaust of the exhaust hole, easily leads to poor exhaust, and makes the shape of the part near the vertex after deformation not match the pad printing pattern, thus easily resulting in defects such as local ink shortage, light transmission, pattern distortion and deformation, wrinkles, orange peel, etc., and further leading to a reduction in the pad printing yield and difficulty in meeting production requirements.
[0031] To solve the above problems, this application provides a pad printing rubber head and a pad printing device.
[0032] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2Schematic diagrams of the pad printing head 10 in some embodiments of the present application at different angles are respectively shown. The pad printing head 10 provided in the present application includes, but is not limited to, being used for printing ink patterns on wearable devices such as watches or electronic devices such as smartphones. The pad printing head 10 can also be used for printing on any other applicable electronic products. The pad printing material used for the pad printing head 10 is not limited to ink. The printing surface of the electronic product targeted by the pad printing head 10 can include a two-dimensional plane or 3D surfaces such as a double-curved surface or a four-curved surface. The pad printing head 10 can cooperate with a pad printing machine to form a pad printing device. The pad printing machine can be used to hold the electronic product to be pad printed, and can also be used to drive the pad printing head 10 to pick up ink and move to the printing surface of the electronic product for printing. The printing operation of the pad printing head 10 can also be achieved by other means such as manual operation, which is not limited in the present application.
[0033] In some embodiments, the pad printing head 10 includes a substrate 11 and a head body 12 provided on the substrate 11. The substrate 11 can be made of any applicable rigid material such as plastic or metal. The substrate 11 serves as a carrier for the head body 12 and can be held by hand or held by the pad printing machine during use to move or hold the pad printing head 10. At least a part of the head body 12 is used to pick up ink during the pad printing operation and is used to print the ink pattern onto the electronic product. The material of the head body 12 includes, but is not limited to, any applicable material with good elasticity, wear resistance, and good ink adsorption performance such as silica gel. During the pad printing operation, the pad printing head 10 is moved to the ink, at least a part of the head body 12 picks up the ink, and then at least a part of the head body 12 is pressed onto the printing surface of the electronic product to print the ink pattern on the head body 12 onto the electronic product.
[0034] In some embodiments, the rubber head body 12 includes a main body portion 121 and a tip portion 122. The main body portion 121 is disposed on the substrate 11, and the tip portion 122 is connected to one end of the main body portion 121 away from the substrate 11. The radial dimension of at least a part of the tip portion 122 gradually decreases in the direction from the substrate 11 to the main body portion 121. That is to say, the tip portion 122 protrudes from one end of the main body portion 121 facing away from the substrate 11, and the tip portion 122 has a vertex 1223. The position of the tip portion 122 farthest from the substrate 11 is the vertex 1223. The main body portion 121 has an axis 1211, and the axis 1211 can be a virtual straight line passing through the geometric center of the main body portion 121 and parallel to the direction from the substrate 11 to the main body portion 121. The shape of the main body portion 121 can be an irregular three-dimensional figure or a regular three-dimensional figure. When the main body portion 121 is a regular three-dimensional figure, the main body portion 121 can be a solid of revolution about the axis 1211. Of course, the specific shapes and dimensional relationships of the main body portion 121 and the tip portion 122 are not limited and can be adaptively designed according to the printing area to be printed and the printing pattern of the electronic product, according to different pad printing requirements. The ink-taking area of the rubber head body 12 is also not limited. It can take ink through all or part of the surface of the tip portion 122, or can take ink through at least part of the tip portion 122 and the main body portion 121. In this application, the ink-taking part corresponds to the effective printing area.
[0035] Further, in some embodiments, the vertex 1223 of the tip portion 122 deviates from the axis 1211. That is to say, the tip portion 122 has an eccentric shape, such as an eccentric cone shape. It can be understood that since the vertex 1223 deviates from the axis 1211, that is, deviates from the center position of the pad printing pattern, when performing the pad printing operation, the orientation selection of the position where the vertex 1223 is located is more flexible, and the orientation of the pad printing rubber head 10 can be adjusted to set the part near the vertex 1223 in the non-effective printing area, rather than the vertex of the traditional pad printing rubber head corresponding to the center position, and usually only the part near the vertex can be set in the effective printing area. Thus, when performing the pad printing operation, the part near the vertex 1223, which is subjected to greater force and has a larger deformation degree difference from other parts, is located in the non-effective printing area and does not participate in the printing operation of the effective printing area. The force and deformation of the part near the vertex 1223 will not affect the printing effect, which is beneficial to improving the printing yield. For example, the printing appearance yield can reach more than 98%.
[0036] In some embodiments, the end head 122 is provided with an exhaust hole 1224, and the position of the exhaust hole 1224 corresponds to the vertex 1223 of the end head 122. During the pad printing operation, when the rubber head body 12 and the surface of the electronic product to be printed are pressed against each other to print the electronic product, the exhaust hole 1224 can discharge the air in the rubber head body 12, preventing the influence of air bubbles on the printed pattern. It can be understood that the position of the exhaust hole 1224 corresponds to the vertex 1223 of the end head 122. During the pad printing operation, the exhaust hole 1224 is also located in the ineffective printing area, and the exhaust is not likely to affect the printing quality. In addition, the eccentric design of the vertex 1223 enables the end head 122 to have a greater degree of deformation during the pad printing process, enabling the exhaust hole 1224 to exhaust more thoroughly and smoothly, which is also beneficial to reducing the influence of air bubbles on the pad printing yield. Of course, the present application only limits the position of the exhaust hole 1224 on the outer surface of the rubber head body 12. The exhaust hole 1224 is located at the vertex 1223 of the end head 122 on the outer surface of the rubber head body 12, and the specific setting of the exhaust passage inside the rubber head body 12 is not limited. It can be a straight hole passage or a bent passage that only penetrates part of the end head 122, or it can extend to part of the body part, which is not limited in the present application and can be specifically designed according to the exhaust requirements of the rubber head body 12.
[0037] In some embodiments, the main body part 121 is a rotating body around the axis 1211. The end head 122 is provided on the side of the main body part 121 facing away from the substrate 11, and the shapes and sizes of the connection part between the main body part 121 and the end head 122 are adapted to each other. Further, in some embodiments, the end head 122 includes a connection part 1221 and a conical part 1222. The connection part 1221 is connected to the main body part 121 and is adapted to the shape and size of the end of the main body part 121 away from the substrate 11. The conical part 1222 is connected to the side of the connection part 1221 facing away from the main body part 121. The radial dimension of the conical part 1222 gradually decreases in the direction from the substrate 11 to the main body part 121. The position where the conical part 1222 is farthest from the substrate 11 forms the vertex 1223 of the end head 122, and the exhaust hole 1224 is provided on the conical part 1222.
[0038] In some embodiments, the radial dimension of the main body portion 121 also gradually decreases in the direction from the substrate 11 towards the main body portion 121. The outer surfaces of the portion of the main body portion 121 close to the connecting portion 1221, the connecting portion 1221, and a part of the conical portion 1222 all serve as ink-taking areas, corresponding to the effective printing area during pad printing. The area near the vertex 1223 of the conical portion 1222 is located in the ineffective printing area. In some embodiments, the conical portion 1222 is generally in the shape of an eccentric cone, and the main body portion 121 is generally in the shape of a frustum of a cone. Of course, the above are only examples of the structure and shape in some embodiments of the rubber head body 12. According to different printing patterns and the area and shape requirements of the surface to be printed of the electronic product, the composition of the rubber head body 12 and the shape and size of each component part can also have other settings, as long as the vertex 1223 of the rubber head body 12 deviates from the axis 1211, and the exhaust hole 1224 and the vertex 1223 are set corresponding to the ineffective printing area to improve the pad printing yield. In this application, the composition and shape of the rubber head body 12 are not specifically limited.
[0039] Combined Figure 3 with Figure 4 As shown, in this application, for the convenience of describing the shape characteristics of the end head portion 122, the concepts of a first cross-section and a second cross-section, two virtual cross-sections, are introduced. The description of the first cross-section and the second cross-section can be understood as the contour line shapes of the cross-sections of the end head portion 122 on two virtual planes. Among them, the first cross-section passes through the vertex 1223 and is parallel to the connection line between the vertex 1223 and the axis 1211. The first cross-section passes through the exhaust hole 1224. The second cross-section is perpendicular to the first cross-section and passes through the vertex 1223. The second cross-section also passes through the exhaust hole 1224. Figure 4 The virtual plane where the cross-section of the pad printing rubber head 10 shown is parallel to the second cross-section and is spaced apart from the second cross-section. This cross-section does not pass through the exhaust hole 1224.
[0040] In some embodiments, the first cross-section has an intersecting first side 1225 and second side 1226. The intersection point of the first side 1225 and the second side 1226 corresponds to the vertex 1223. The exhaust hole 1224 is located at the junction of the first side 1225 and the second side 1226. The included angle between the first side 1225 and the second side 1226 is 100° - 170°, and this angle can be adjusted according to the printing pattern and the shape of the surface to be printed of the electronic product.
[0041] In some embodiments, the second cross-section divides the end head 122 into a first part and a second part. The axis 1211 passes through the first part, and the area of the outer surface of the first part is larger than that of the outer surface of the second part. With such a setting, while being eccentric, by increasing the area of the part of the end head 122 in the direction opposite to the eccentric direction (i.e., the direction in which the axis 1211 points to the vertex 1223), the ink-taking area of the pad printing head 10 can be increased during the eccentric design, meeting the requirements of full-surface large-area pad printing. At the same time, the overall end head 122 can have a larger deformation space to fully fit the surface to be printed, adapt to different surfaces to be printed such as 2D and 3D, and improve the pad printing quality and the pad printing yield.
[0042] In some embodiments, the thickness of the substrate 11 can be 5.3 mm, the maximum height of the pad printing head 10 is 33.26 mm ± 0.1, the included angle between the two contour lines of the main body 121 in the cross-section passing through the axis 1211 is 53°, the diameter of the end of the main body 121 facing the substrate 11 is 40.25 mm ± 0.1. In the first cross-section, the distance from the vertex 1223 to the edge of the end head 122 in the eccentric direction is 7.89 mm, the distance from the vertex 1223 to the edge of the end head 122 in the direction opposite to the eccentric direction is 10.93 mm, the radial dimension of the connecting part 1221 is 19 mm ± 0.1, and the diameter of the substrate 11 is 51.5 mm.
[0043] It can be understood that the vertex 1223 of the pad printing head 10 provided in the present application deviates from the axis 1211, and it can be applied to asymmetric printing patterns, for example, it is applicable to the printing of patterns that are not centered and non-symmetrical. Through the design that the vertex 1223 and the exhaust hole 1224 deviate from the axis 1211, the exhaust volume and the deformation space of the pad body 12 can be increased, adapting to large-area full-surface pad printing, and defects such as pad printing pattern distortion and deformation can be reduced, improving the pad printing yield. During the preparation process of the pad printing head 10, the shape of the pad body 12 can be changed by adjusting the shape of the pad mold. For example, the shape of the pad body 12 can be adjusted according to the analysis of the shape, size, and pattern of the actual printing area. While making the vertex 1223 and the exhaust hole 1224 deviate from the axis 1211, the vertex 1223 and the exhaust hole 1224 are corresponded to the invalid printing area, and the areas of other parts are made larger and the deformation degree is larger to meet the requirements of full-surface pad printing. The shape of the pad mold is adjusted according to the designed shape of the pad body 12 to manufacture the corresponding pad body 12.
[0044] After the corresponding rubber head body 12 is manufactured, the adjustment and verification of the pad printing orientation and printing pressure can be carried out first. The position of the pad printing rubber head 10 is adjusted through the pad printing machine table, so that the vertex 1223 and the exhaust hole 1224 are located in the invalid printing area. Then, the orientation and printing pressure of the rubber head body 12 are gradually adjusted until the ink pickup is complete and the printed pattern meets the quality requirements. After verifying that the two pad printing patterns meet the quality requirements, normal pad printing production can be carried out.
[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0046] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.
Claims
1. A pad printing rubber head, characterized in that, include: substrate; as well as, The rubber head body includes a main body portion arranged on the substrate and an end portion connected to the main body portion, the radial dimension of at least part of the end portion gradually decreases in the direction from the substrate to the main body portion, the main body portion has an axis, and the apex of the end portion deviates from the axis.
2. The pad printing rubber head according to claim 1, wherein The end portion is provided with an exhaust hole, and the position of the exhaust hole corresponds to the vertex of the end portion.
3. The pad printing rubber head according to claim 1, characterized in that, Part of the main body and part of the end portion correspond to an effective printing area, and the vertex of the end portion corresponds to an ineffective printing area.
4. The pad printing rubber head according to claim 1, characterized in that, The main body is a rotating body around the axis, the end portion is arranged on a side of the main body facing away from the substrate, and the shape and size of the connection between the main body and the end portion are adapted.
5. The pad printing rubber head according to claim 4, characterized in that, The end portion includes a connecting portion and a tapered portion. The connecting portion is connected to the main body and adapted to an end of the main body away from the substrate. The tapered portion is connected to a side of the connecting portion facing away from the main body.
6. The tampon according to claim 5, characterized in that, The radial dimension of the main body portion gradually decreases in a direction from the substrate to the main body portion.
7. The pad printing rubber head according to claim 6, wherein, The conical portion is substantially in the shape of an eccentric cone; and / or, The main body is substantially in a truncated cone shape.
8. The pad printing rubber head according to any one of claims 1-7, characterized in that, The end portion has a first cross-section, which passes through the vertex and is parallel to the line connecting the vertex and the axis. The first cross-section has a first side and a second side intersecting each other, the intersection of the first side and the second side corresponds to the vertex, and the angle between the first side and the second side is 100°-170°.
9. The pad printing rubber head according to claim 8, wherein, The end portion has a second section perpendicular to the first section and passing through the vertex, the second section dividing the end portion into a first part and a second part, the axis passes through the first part, and the area of the outer surface of the first part is greater than the area of the outer surface of the second part.
10. A pad printing device, characterized in that, It comprises the pad printing rubber head as described in any one of claims 1 to 9.