Transfer printing rubber head and transfer printing equipment

Abstract

The utility model relates to a pad printing rubber head and pad printing equipment, and the pad printing rubber head comprises a first connecting part which is connected to the pad printing equipment; the second connecting part is connected to the side, away from the transfer printing equipment, of the first connecting part, and the hardness of the second connecting part is smaller than that of the first connecting part; the rubber head function part comprises a printing area and an exhaust area which are coaxially arranged, the printing area is arranged on the side, away from the first connecting part, of the second connecting part, the exhaust area is arranged on the side, away from the second connecting part, of the printing area in a protruding mode, and in the axial direction of the rubber head function part, the projection plane of the exhaust area is completely contained in the projection plane of the printing area. According to the technical scheme, the technical problems that in traditional transfer printing work, transfer printing of different printing areas needs to be achieved through multiple types of rubber heads, the whole transfer printing process is complex, and the transfer printing cost is high are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of pad printing equipment, and in particular to a pad printing rubber head and pad printing equipment. Background Art

[0002] With the rapid development of electronic technology, smart wearable devices have become the new favorite in the consumer electronics market. In order to improve the appearance of smart wearable devices, the specified pattern needs to be printed on the printing area of ​​the smart wearable devices. Compared with the traditional spray printing process, the pad printing process can avoid the volatilization of ink dust, reduce ink waste, and reduce environmental pollution.

[0003] In the related art, the pattern in the mold is usually transferred to the designated printing area of ​​the smart wearable device through a pad printing rubber head to achieve ink transfer. Since the smart wearable device has multiple printing areas, pad printing needs to be achieved through multiple traditional rubber heads, which makes the entire pad printing process complicated and the pad printing cost high. Utility Model Content

[0004] The present application provides a pad printing rubber head and pad printing equipment to solve the technical problem that in traditional pad printing operations, multiple rubber heads are required to achieve pad printing of different printing areas, making the entire pad printing process complicated and the pad printing cost high.

[0005] To this end, in the first aspect, an embodiment of the present application provides a pad printing rubber head, which includes: a first connecting part, connected to a pad printing device; a second connecting part, connected to a side of the first connecting part away from the pad printing device, the hardness of the second connecting part is less than the hardness of the first connecting part; and a rubber head functional part, including a coaxially arranged printing area and an exhaust area, the printing area is arranged on a side of the second connecting part away from the first connecting part, and the exhaust area is protrudingly arranged on a side of the printing area away from the second connecting part, and in the axial direction of the rubber head functional part, the projection surface of the exhaust area is completely contained in the projection surface of the printing area.

[0006] In a possible embodiment, the printing area includes an ink extraction unit and a printing exhaust unit arranged on the inner side of the ink extraction unit, the periphery of the ink extraction unit away from the printing exhaust unit is connected to the periphery of the second connecting part, and the periphery of the printing exhaust unit away from the ink extraction unit is connected to the periphery of the exhaust area.

[0007] In a possible implementation, the radius difference between the rounded corner Rd of the inner side wall of the printing area of ​​the pad to be printed and the rounded corner Rc of the ink taking unit is less than 0.5 mm; and / or,

[0008] The contact angle D of the printing exhaust unit is 3° to 5°.

[0009] In a possible implementation, the exhaust zone includes a first exhaust unit, and a contact angle E of the first exhaust unit is 10° to 15°; and / or,

[0010] The exhaust area includes a first exhaust unit, and the ratio of the length-width ratio of the first exhaust unit to the length-width ratio of the workpiece to be printed is in the range of 0.9 to 1.1.

[0011] In a possible implementation, the exhaust zone further includes second exhaust units, and the second exhaust units are evenly spaced around the first exhaust units.

[0012] In a possible implementation, the surface roughness of the printing area is less than 0.025 mm, and the surface roughness of the exhaust area is 0.025 mm to 0.064 mm.

[0013] In a possible implementation manner, in the axial direction of the rubber head functional part, the height of the rubber head functional part is 3 mm to 5 mm; and / or,

[0014] The hardness of the functional part of the rubber head is 13HA to 17HA.

[0015] In a possible implementation manner, in the axial direction of the rubber head functional portion, the height of the second connecting portion is 20 mm to 25 mm; and / or,

[0016] The hardness of the second connecting portion is 13HA to 17HA; and / or,

[0017] The draft angle B of the second connecting portion is 0° to 3°.

[0018] In a possible implementation manner, in the axial direction of the rubber head functional portion, the height of the first connecting portion is 20 mm to 25 mm; and / or,

[0019] The hardness of the first connecting portion is 28HA to 32HA; and / or,

[0020] The draft angle A of the first connecting portion is greater than 20°.

[0021] In a second aspect, the present application also provides a pad printing device, including the pad printing rubber head as described above.

[0022] According to the pad printing rubber head and pad printing equipment provided by the embodiment of the present application, the pad printing rubber head includes: a first connection part, connected to the pad printing equipment; a second connection part, connected to the side of the first connection part away from the pad printing equipment, the hardness of the second connection part is less than the hardness of the first connection part; and a rubber head functional part, including a coaxially arranged printing area and an exhaust area, the printing area is arranged on the side of the second connection part away from the first connection part, the exhaust area is convexly arranged on the side of the printing area away from the second connection part, and in the axial direction of the rubber head functional part, the projection surface of the exhaust area is completely contained in the projection surface of the printing area. The technical solution of the present application realizes multi-area pad printing of the workpiece to be pad printed through the printing area, and at the same time, realizes exhaust of the rubber head functional part through the exhaust area, so as to reduce the air in the printing surface, improve the exhaust effect, enhance the fitting effect between the rubber head functional part and the printing area of ​​the workpiece to be pad printed, and improve the pad printing effect. Compared with the traditional pad printing operation which requires multiple pad printing operations on different printing areas of the workpiece to be pad printed using multiple pad printing rubber heads, the pad printing rubber head provided in the embodiment of the present application can achieve simultaneous pad printing of different printing areas of the workpiece to be pad printed through the rubber head functional area thereon, thereby streamlining the pad printing process and reducing the pad printing cost; and, improving the exhaust effect of the printing area, enhancing the fit between the rubber head functional part and the printing area of ​​the workpiece to be pad printed, reducing the difficulty of pad printing and improving the pad printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0024] Figure 1 A schematic diagram of the structure of a pad printing rubber head provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 A partial enlarged view of

[0026] Figure 3 This is a partial assembly diagram after the pad printing rubber head is assembled to the pad printing equipment in the embodiment of the present application;

[0027] Figure 4 This is a partial enlarged view of the pad printing rubber head acting on the pad printing piece in the embodiment of the present application;

[0028] Figure 5 This is a bottom view of the rubber head functional part provided in an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100, first connecting portion; 110, first transition zone; 120, draft zone; 130, second transition zone;

[0031] 200, second connecting portion;

[0032] 300, pad function unit; 310, printing area; 311, ink taking unit; 312, printing exhaust unit; 320, exhaust area; 321, first exhaust unit; 322, second exhaust unit;

[0033] 400, installation department;

[0034] Z, axial direction; 10, outer platform; 20, chamfer; 30, concave side wall; 40, window; 50, aluminum rubber head fixing block. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0037] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0038] With the rapid development of consumer electronics, smart wearable devices have emerged as a new favorite in the electronic product market. In order to meet market demand, patterns of various colors are generally printed on smart wearable devices to improve their appearance. Traditional ink printing processes mainly include spraying and pad printing. However, spraying will cause ink dust to volatilize, resulting in ink waste and environmental pollution, affecting human health; and the spraying process requires film masking before processing, which is costly and has low production capacity. Therefore, pad printing is often used to print patterns on smart wearable devices.

[0039] In the related art, a large-curved conical rubber head with a single hardness is generally used to transfer the pattern to the designated printing area of ​​the smart wearable device. However, the traditional pad printing rubber head has extremely high requirements for its hardness. If the hardness of the traditional pad printing rubber head is high, it cannot meet the requirements of simultaneous pad printing of the inner side wall and the chamfer. Even if the pattern is barely transferred to the designated printing area, it will cause problems such as lack of ink and poor pad printing due to incomplete exhaust at the concave side wall 30, and the pad printing effect will be poor; if the hardness of the traditional pad printing rubber head is low, the deformation of the rubber head mounting part and the supporting part thereon is large, which can easily lead to unstable size of the pad printing rubber head and cannot ensure pad printing stability.

[0040] Therefore, the present application proposes a double-hardness pad printing rubber head so that it can realize simultaneous pad printing of multiple printing areas on smart wearable devices, especially for the pad printing of the inner side wall and chamfer of smart wearable square watch products, and can also meet the pad printing equipment's hardness requirements for the pad printing rubber head mounting part and the support part, so that when the pad printing rubber head is assembled on the mobile end of the pad printing equipment, there will be no problems such as unstable assembly between the mounting part and the pad printing equipment due to excessive deformation, and the pad printing is unstable due to the small support strength of the support part to the pad printing part of the pad printing rubber head, so as to realize simultaneous pad printing of multiple areas of smart wearable devices with good pad printing effect. In addition, the double-hardness pad printing rubber head provided in the present application can provide a full pad printing process that can realize simultaneous pad printing of multiple printing area patterns at the same time. Compared with the traditional pad printing process that requires different types of pad printing rubber heads to be used for pad printing of different pad printing parts, the full pad printing process provided in the present application can save a lot of pad printing time while ensuring the pad printing effect, improve pad printing efficiency, and improve the production efficiency of products that need to be pad printed.

[0041] like Figures 1 to 3 As shown, an embodiment of the present application provides a pad printing rubber head, which includes: a first connecting part 100, connected to a pad printing device; a second connecting part 200, connected to a side of the first connecting part 100 away from the pad printing device, the hardness of the second connecting part 200 is less than the hardness of the first connecting part 100; and a rubber head functional part 300, including a coaxially arranged printing area 310 and an exhaust area 320, the printing area 310 is arranged on a side of the second connecting part 200 away from the first connecting part 100, and the exhaust area 320 is protrudingly arranged on a side of the printing area 310 away from the second connecting part 200, and on the axial direction Z of the rubber head functional part 300, the projection surface of the exhaust area 320 is completely contained in the projection surface of the printing area 310.

[0042] In this embodiment, the printing area 310 is used to realize the multi-area pad printing of the outer platform 10, chamfer 20, concave side wall 30 and window 40 of the pad to be printed. At the same time, the exhaust area 320 is used to realize the exhaust of the rubber head functional part 300, so as to reduce the air in the printing surface, improve the exhaust effect, enhance the fitting effect between the rubber head functional part 300 and the printing area of ​​the pad to be printed, and improve the pad printing effect. Compared with the traditional pad printing operation, which requires multiple pad printing operations to perform multiple pad printings on different printing areas such as the outer platform 10, chamfer 20, concave side wall 30 and window 40 of the pad to be printed, the pad printing rubber head provided in the embodiment of the present application can realize the simultaneous pad printing of different printing areas 310 of the pad to be printed through the rubber head functional area thereon, which simplifies the pad printing process and reduces the pad printing cost; and improves the exhaust effect of the printing area, enhances the fit between the rubber head functional part 300 and the printing area of ​​the pad to be printed, reduces the difficulty of pad printing, and improves the pad printing effect.

[0043] Specifically, the pad printing rubber head is configured as a composite component including at least a first connecting part 100, a second connecting part 200 and a rubber head functional part 300. The first connecting part 100 can be a hard cylindrical structure for connecting to the pad printing equipment; the second connecting part 200 can be a soft solid lampshade-like structure for connecting transition and providing a larger deformation pad printing space for the rubber head functional part 300; the rubber head functional part 300 can be a soft silicone that is approximately a convex mirror, which is used to transfer the pattern to the designated pad printing area of ​​the workpiece to be pad printed; the rubber head functional part 300 is configured as a printing area 310 and an exhaust area 320 along its radial direction from outside to inside. The printing area 310 can be used to take ink and patterns, and transfer the pattern to the designated pad printing area. The exhaust area 320 is used for exhausting, ensuring the fitting effect between the rubber head functional part 300 and the designated pad printing area, and improving the pad printing effect of the pad printing rubber head. In addition, since the hardness of the first connecting part 100 of the pad printing rubber head provided in this embodiment is greater than the hardness of the second connecting part 200, the hard first connecting part 100 can ensure the stability and reliability of the connection between the pad printing rubber head and the pad printing equipment, and prevent the pad printing rubber head from falling off the pad printing equipment due to excessive deformation; at the same time, the soft second connecting part 200 is used to provide a larger deformation amount to the rubber head functional area, so that the rubber head functional area can simultaneously perform pad printing on the outer platform 10, the inner concave side wall 30 and the chamfer / chamfer 20 of the pad printing part, thereby simplifying the pad printing process of multiple pad printing areas and improving the pad printing effect.

[0044] In one example, for the convenience of processing, the second connection part 200 and the rubber head functional part 300 can be integrally formed. In this way, the production process is simplified and the production cost is reduced. In addition, in order to avoid the formation of a partition line or a fault line at the connection between the first connection part 100 and the rubber head functional part 300, which affects the external aesthetics of the pad printing rubber head, liquid silicone with the same hardness can be used to prepare the first connection part 100 and the rubber head functional part 300.

[0045] In one example, the total height of the pad printing rubber head in the axial direction Z is 50 mm to 60 mm, for example but not limited to, the total height of the pad printing rubber head is 55 mm. Such a setting can avoid the problem that the pad printing rubber head is too small, resulting in insufficient total deformation of the pad printing rubber head, causing the outer platform 10 area of ​​the pad to be printed to be unable to be covered by pad printing; at the same time, it can avoid the problem that the pad printing rubber head exceeds the machine stroke due to its excessive total height and cannot perform the pad printing operation, thereby ensuring the normal progress of multi-area pad printing and ensuring the pad printing effect.

[0046] In one example, the first connecting portion 100 includes a first transition zone 110 connected to the pad printing equipment, a demolding zone 120 connected to the rubber head functional portion 300, and a second transition zone 130 connected between the first transition zone 110 and the demolding zone 120, and the fillet radii Ra of the first transition zone 110 and the fillet Rb of the second transition zone 130 are both greater than 5 mm.

[0047] In this embodiment, the specific configuration of the first connection part 100 is optimized. Specifically, the first connection part 100 is configured as a composite component including at least a first transition zone 110, a draft zone 120 and a second transition zone 130, wherein the radial dimension of the first transition zone 110 is greater than the radial dimension of the second transition zone 130, and the radial dimension of the second transition zone 130 is greater than the radial dimension of the draft zone 120, and they are sequentially connected from top to bottom to form a funnel-like structure, so that the first connection part 100 can be connected and fastened with the pad printing equipment through the large-sized first transition zone 110, thereby enhancing the overall rigidity of the first connection part 100; and the draft zone 120 can be used to realize the connection with the second connection part 200 through the small-sized draft zone 120, so as to adapt to the radial dimensions of the second connection part 200 and the rubber head functional part 300, thereby saving raw materials and reducing costs.

[0048] In addition, the outer surfaces of the first transition zone 110 and the second transition zone 130 can be prepared into smooth arc surfaces, and the first transition zone 110 and the second transition zone 130 are tangentially connected; at the same time, the outer surface of the draft zone 120 is prepared into an inclined plane, and the draft zone 120 is smoothly connected to the second transition zone 130. At this time, the fillet of the first transition zone 110 is defined as Ra, and the fillet of the second transition zone 130 is defined as Rb, so that the angle value of the fillet Ra is greater than the angle value between the fillets Rb, and the fillet radius of the two is greater than R5mm, so as to facilitate the processing and demolding of the first connecting portion 100.

[0049] In a possible implementation, it further includes a mounting portion 400 coaxially arranged with the first connecting portion 100 , and the first connecting portion 100 is interference fitly arranged on the pad printing device through the mounting portion 400 .

[0050] In this embodiment, the specific configuration of the pad printing rubber head is further optimized. Specifically, the pad printing rubber head is configured as a composite component including at least a first connecting portion 100, a second connecting portion 200, a rubber head functional portion 300 and a mounting portion 400. The mounting portion 400 is essentially still a silicone structural member with a relatively high hardness and a certain flexibility. Its top surface can be designed perpendicular to its side surface and has an interference fit with the cavity of the aluminum rubber head fixing block 50 of the pad printing device. For example, the interference width L between the mounting portion 400 and the cavity of the aluminum rubber head fixing block 50 can be 1mm to 2mm to enhance the connection tightness between the mounting portion 400 and the pad printing device. During installation, the mounting portion 400 is forcibly inserted into the fixing block cavity of the aluminum rubber head by utilizing the flexibility of the mounting portion 400; after the installation is completed, the mounting portion 400 will return to its original shape, filling and interference-connected to the aluminum rubber head fixing block 50 of the pad printing device. This design abandons the traditional installation method that the pad printing rubber head needs to be bonded to the aluminum connecting plate with threaded holes. There is no need to use a primer to bond the pad printing rubber head, which makes installation more convenient. In addition, the vulcanization time of the pad printing rubber head is shortened, effectively saving the cost of auxiliary materials.

[0051] In one example, in the axial direction Z of the rubber head functional part 300, the height of the mounting part 400 is 8mm to 10mm. With such a setting, the mounting part 400 can be within the optimal length range, ensuring the effective connection distance between the mounting part 400 and the pad printing equipment, while facilitating the subsequent disassembly and assembly of the pad printing rubber head by the operators. If the height of the mounting part 400 is lower than 8mm, the fit between the mounting part 400 and the pad printing equipment will not be tight, affecting the tightness of the connection between the pad printing rubber head and the mounting part 400; if the height of the mounting part 400 is greater than 10mm, it will be inconvenient for the operators to disassemble and assemble the pad printing rubber head later. For example, but not limited to, the height of the mounting part 400 can be set to 9mm.

[0052] In one example, the hardness of the mounting portion 400 is 28HA to 32HA. This arrangement ensures the hardness of the mounting portion 400, so that it can be more tightly matched with the aluminum rubber head fixing block 50 on the pad printing device, improve the connection tightness and reliability between the pad printing rubber head and the pad printing device, and prevent the pad printing rubber head from falling off; at the same time, the deformation of the pad printing rubber head during the ink removal and de-inking operation can be reduced by the mounting portion 400 with greater hardness, thereby improving the pad printing accuracy and pad printing yield. For example, but not limited to, the hardness of the mounting portion 400 is 30HA.

[0053] In a possible embodiment, the printing area 310 includes an ink extraction unit 311 and a printing exhaust unit 312 arranged on the inner side of the ink extraction unit 311, and the periphery of the ink extraction unit 311 on a side away from the printing exhaust unit 312 is connected to the periphery of the second connecting part 200, and the periphery of the printing exhaust unit 312 on a side away from the ink extraction unit 311 is connected to the periphery of the exhaust area 320.

[0054] In this embodiment, the specific configuration of the printing area 310 is optimized. Specifically, the printing area 310 is configured as a combination component including at least an ink taking unit 311 and a printing exhaust unit 312. The ink taking unit 311 can be approximately a ring-shaped columnar structure, which is configured at the outermost layer of the printing area 310, and is used to take ink from a specified position and print the taken ink on the specified printing area 310 domain of the printed piece; the printing exhaust unit 312 can be approximately a ring-shaped columnar structure, which is configured on the inner side of the ink taking unit 311, and is used to ensure the perfect fit between the printing area 310 and the outer platform, the inner concave side wall 30 and the chamfer / chamfer 20, and exhaust the gas in the printing area 310 to avoid the occurrence of poor pad printing problems such as lack of ink.

[0055] In addition, the curvature of the ink extraction unit 311 can be made greater than the curvature of the printing exhaust unit 312, so that when the printing area 310 contacts the supporting surface of the piece to be printed, it can successively contact and fit with the window 40, the concave side wall 30, the chamfer / chamfer 20 and the outer platform 10 thereon, and gradually discharge the gas in the ink extraction unit 311, thereby improving the exhaust effect and the printing effect.

[0056] In a possible implementation, the radius difference between the rounded corner Rd of the inner side wall of the printing area 310 of the workpiece to be printed and the rounded corner Rc of the ink taking unit 311 is less than 0.5 mm. This arrangement can ensure that the ink taking unit 311 can produce a large deformation under a relatively small pressure, thereby achieving simultaneous printing of the outer platform 10, chamfer 20, concave side wall 30 and window 40 of the workpiece to be printed, and achieving excellent printing effect; and it is also convenient for subsequent demolding.

[0057] In a possible embodiment, the contact angle D of the printing exhaust unit 312 is 3° to 5°. With such a configuration, the exhaust effect and the fitting effect of the printing area 310 can be taken into account at the same time, so that the rubber head functional part 300 can achieve better fitting with the concave side wall 30 and the chamfer / chamfer 20 of the square watch product, and can ensure the exhaust angle between the two, thereby improving the pad printing effect. If the contact angle D of the printing exhaust unit 312 is less than 3°, the exhaust effect of the printing area 310 will be poor, air trapped sand hole defects will easily occur, and there will be ink missing in the pad printing pattern; if the contact angle D of the printing exhaust unit 312 is greater than 5°, the contact force of the printing area 310 will be too large, and the fitting effect between the printing area 310 and the pad printing piece will be poor, resulting in a light color and unclear pattern of the pad printing pattern. For example, but not limited to, the contact angle D of the printing exhaust unit 312 is 4°.

[0058] In a possible implementation, the exhaust area 320 includes a first exhaust unit 321 , and a contact angle E of the first exhaust unit 321 is 10° to 15°.

[0059] In this embodiment, the specific configuration of the exhaust area 320 is optimized. Specifically, a first exhaust unit 321, which can be a turtle-shaped boss, is configured, and the range of the contact angle E of the first exhaust unit 321 is limited so that the contact angle between the first exhaust unit 321 and the bearing surface with the printed member is kept in a suitable range, which improves both the exhaust effect and the bonding effect. If the contact angle E of the first exhaust unit 321 is less than 10°, the exhaust effect of the exhaust area 320 will be poor; if the contact angle E of the first exhaust unit 321 is greater than 15°, the downward pressure required for the pad printing rubber head is large, which will cause the deformation of the pad printing rubber head to be large, affecting the bonding effect of the printing area 310.

[0060] In a possible embodiment, the exhaust area 320 includes a first exhaust unit 321, and the ratio of the aspect ratio of the first exhaust unit 321 to the aspect ratio of the workpiece to be printed is in the range of 0.9 to 1.1. Such a setting can overcome the problem that the length and width deformation of the pad printing rubber head is different due to the different length and width ratios of the workpiece to be printed, and the long and short sides cannot be simultaneously bonded to the product, thereby improving the bonding effect between the workpiece to be printed with different length and width ratios and the pad printing rubber head. For example, but not limited to, the length and width ratio of the first exhaust unit 321 can be configured to be equal to the length and width ratio of the workpiece to be printed, so as to maximize the tight fit and pad printing effect between the pad printing rubber head and the workpiece to be printed with different lengths and widths, and ensure the clarity and integrity of the pad printing pattern. Of course, in other embodiments, a certain degree of processing error and assembly error is allowed, and it is not necessary to set the first exhaust unit 321 and the workpiece to be printed completely equal.

[0061] This design is suitable for smart wearable devices with large differences in length and width, such as square watches. Specifically, when the length and width of a square watch product differ greatly, the exhaust angle that can be provided by its concave side wall 30 is also small; at this time, if the rubber head functional part 300 of the pad printing rubber head acts on the bearing surface of the square watch product, there will be problems such as the length and width of the rubber head functional part 300 being deformed differently and the long and short sides being unable to fit with the long and wide sides of the square watch at the same time. Therefore, it is necessary to adaptively adjust the length-to-width ratio of the first exhaust unit 321 to enhance the tightness of the fit between the pad printing rubber head and the bearing surface of the square watch product, improve the exhaust effect, and ensure the pad printing effect.

[0062] In a possible implementation, the exhaust area 320 further includes second exhaust units 322 , and the second exhaust units 322 are evenly spaced around the first exhaust units 321 .

[0063] In this embodiment, the specific configuration of the exhaust area 320 is further optimized. Specifically, the exhaust area 320 is configured as a combination component including at least a first exhaust unit 321 and a second exhaust unit 322. The second exhaust unit 322 can be a button-type boss disposed at the corner of the first exhaust unit 321. It can improve the poor pad printing problems of difficult corner exhaust and easy sand holes of the product without affecting the transfer of ink and pad printing size, and reduce the force required for pad printing to press down, so as to achieve a good exhaust effect.

[0064] It should be noted that the preparation molds of the first exhaust unit 321 and the second exhaust unit 322 can be polished with 600# sandpaper to make the surface roughness of the mold reach Ra0.064mm, so that the exhaust area 320 obtained by the mold preparation has a larger roughness, avoiding the situation where the pad printing rubber head sticks to the product due to vacuum adsorption after the rubber head functional part 300 is abutted on the supporting surface of the to-be-printed part.

[0065] In a possible embodiment, the surface roughness of the printing area 310 is less than 0.025 mm, and the surface roughness of the exhaust area 320 is 0.025 mm to 0.064 mm. In this way, the surface of the printing area 310 after vulcanization can be smooth and clean, meeting the printing requirements of ink removal and de-inking, and improving the clarity and quality of the pad printing pattern; and the small holes and fine pores on the surface of the exhaust area 320 can be used to exhaust the rubber head functional part 300, so as to avoid it from adhering to the pad to be printed due to vacuum adsorption, thereby improving the exhaust effect. The areas with different roughness on the rubber head functional part 300 can be obtained by preparing the surface roughness of the mold. For example, the mold can be configured to have a mold highlight area with a surface roughness less than or equal to Ra0.025 mm and a mold matte area with a surface roughness of Ra0.064 mm, so as to prepare the printing area 310 through the mold highlight area and prepare the exhaust area 320 through the mold matte area, thereby obtaining the rubber head functional part 300 with different roughness.

[0066] In a possible embodiment, in the axial direction Z of the rubber head functional part 300, the height of the rubber head functional part 300 is 3mm to 5mm; and / or the hardness of the rubber head functional part 300 is 13HA to 17HA. Such a configuration can provide the rubber head functional part 300 with a deformation space of sufficient height, so that the rubber head functional part 300 can simultaneously cover the outer platform 10, chamfer 20, concave side wall 30 and window 40 of the workpiece to be printed, so as to achieve simultaneous pad printing of multiple areas with good pad printing effect; and the overall hardness of the rubber head functional part 300 can be low and the flexibility can be greater, so as to produce greater deformation, improve the fitting effect between the rubber head functional part 300 and the workpiece to be pad printed, and improve the printing clarity of the pad printing pattern.

[0067] In a possible embodiment, in the axial direction Z of the rubber head functional part 300, the height of the second connecting part 200 is 20mm to 25mm; and / or, the hardness of the second connecting part 200 is 13HA to 17HA. Such a configuration can not only make the second connecting part 200 at a suitable total height, avoid the problem that the total height of the entire pad printing rubber head is too large, so that the pad printing rubber head exceeds the machine stroke and cannot perform the pad printing operation, and ensure the normal pad printing operation; but also make the second connecting part 200 maintain a low hardness, which is convenient for subsequent demolding, and can provide flexible compensation to the rubber head functional part 300 through the second connecting part 200, and provide sufficient deformation to the pad printing rubber head, so that the pad printing rubber head can produce a large deformation under a small pressure, and can simultaneously cover multiple pad printing areas of the workpiece to be pad printed, so as to achieve full pad printing. For example, but not limited to, the height of the second connecting part 200 is 23mm, and the hardness of the second connecting part 200 is 15HA.

[0068] In a possible embodiment, the draft angle B of the second connection part 200 is 0° to 3°. Such a setting can facilitate subsequent demolding, and at the same time, it can also reduce trapped air, improve the exhaust effect, and ensure the integrity and quality of the pad printing pattern. If the draft angle B of the second connection part 200 is greater than 3°, the rubber head functional part 300 will contact the outer platform 10 of the pad to be printed in advance before transferring the ink to the concave side wall 30 and the chamfer / chamfer 20 of the product, so that the gas in the printing area 310 cannot be discharged to the outside, resulting in pad printing trapped air, lack of ink and other poor pad printing problems in the printing area 310; if the draft angle of the second connection part 200 is less than 0°, the second connection part 200 will present an undercut design, resulting in difficulty in demolding the product, and the processing difficulty of the undercut design is greater, requiring five-axis CNC processing, high cost, and poor pad printing effect of the pad printing outer platform 10. For example, but not limited to, the draft angle B of the second connection part 200 is 2°.

[0069] In a possible embodiment, in the axial direction Z of the rubber head functional part 300, the height of the first connection part 100 is 20mm-25mm; and / or, the hardness of the first connection part 100 is 28HA-32HA; and / or, the draft angle A of the first connection part 100 is greater than 20°. Such a configuration can not only make the first connection part 100 at a suitable total height, avoid the problem that the total height of the entire pad printing rubber head is too large, so that the pad printing rubber head exceeds the machine stroke and cannot perform the pad printing operation, and ensure the normal pad printing operation; and ensure the hardness of the first connection part 100, so that it is roughly the same as the hardness of the mounting part 400, ensure the connection rigidity of the entire pad printing rubber head, make the pad printing rubber head have a larger hardness when it is installed on the pad printing equipment side, reduce the deformation of the pad printing rubber head during the ink removal and de-inking operation, and improve the pad printing accuracy and pad printing yield. In addition, since the pad printing rubber head is prepared by a glue pouring process, when the liquid glue is poured into the mold and solidified into shape, it needs to be blown out with an air gun. Therefore, the draft angle A of the draft area 120 below the first connecting part 100 is designed to be 20° or above, so as to improve the convenience of subsequent demolding through the large-angle draft angle A, avoid the occurrence of sticking mold during demolding and difficulty in removing the pad printing rubber head, or scratching the pad printing rubber head due to sticking mold, thereby improving the production yield of the pad printing rubber head.

[0070] For example but not limited to, the height of the first connection part 100 is 23 mm, the hardness of the first connection part 100 is 30HA, and the draft angle A of the first connection part 100 is 22°.

[0071] In addition, the present application also provides a pad printing device, including a pad printing rubber head as described in any one of the above items. The specific structure of the pad printing rubber head refers to the above embodiment. Since the pad printing device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0072] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0073] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0074] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pad printing rubber head, characterized in that: include: A first connecting portion (100) connected to a pad printing device; A second connecting portion (200) connected to a side of the first connecting portion (100) away from the pad printing device, the second connecting portion having a lower hardness than the first connecting portion; and The rubber head functional part (300) comprises a coaxially arranged printing area (310) and an exhaust area (320), wherein the printing area (310) is arranged on a side of the second connecting part (200) away from the first connecting part (100), and the exhaust area (320) is protrudingly arranged on a side of the printing area (310) away from the second connecting part (200), and in the axial direction of the rubber head functional part (300), the projection surface of the exhaust area (320) is completely contained in the projection surface of the printing area (310).

2. The pad printing rubber head according to claim 1, characterized in that: The printing area (310) includes an ink extraction unit (311) and a printing exhaust unit (312) arranged on the inner side of the ink extraction unit (311), the periphery of the ink extraction unit (311) away from the printing exhaust unit (312) is connected to the periphery of the second connecting portion (200), and the periphery of the printing exhaust unit (312) away from the ink extraction unit (311) is connected to the periphery of the exhaust area (320).

3. The pad printing rubber head according to claim 2, characterized in that: The radius difference between the rounded corner Rd of the inner side wall of the printing area of ​​the pad printing piece and the rounded corner Rc of the ink taking unit (311) is less than 0.5 mm; and / or, The contact angle D of the printing exhaust unit (312) is 3° to 5°.

4. The pad printing rubber head according to claim 1, characterized in that: The exhaust zone (320) comprises a first exhaust unit (321), and a contact angle E of the first exhaust unit (321) is 10° to 15°; and / or, The exhaust zone (320) comprises a first exhaust unit (321), and the ratio of the length-to-width ratio of the first exhaust unit (321) to the length-to-width ratio of the workpiece to be printed is in the range of 0.9 to 1.

1.

5. The pad printing rubber head according to claim 4, characterized in that: The exhaust zone (320) further comprises second exhaust units (322), and the second exhaust units (322) are evenly spaced around the first exhaust unit (321).

6. The pad printing rubber head according to claim 1, characterized in that: The surface roughness of the printing area (310) is less than 0.025 mm, and the surface roughness of the exhaust area (320) is 0.025 mm to 0.064 mm.

7. The pad printing rubber head according to claim 1, characterized in that: In the axial direction of the rubber head functional part (300), the height of the rubber head functional part (300) is 3 mm to 5 mm; and / or, The hardness of the rubber head functional part (300) is 13HA-17HA.

8. The pad printing rubber head according to claim 1, characterized in that: In the axial direction of the rubber head functional part (300), the height of the second connecting part (200) is 20 mm to 25 mm; and / or, The hardness of the second connecting portion (200) is 13HA-17HA; and / or, The draft angle B of the second connecting portion (200) is 0° to 3°.

9. The pad printing rubber head according to claim 1, characterized in that: In the axial direction of the rubber head functional part (300), the height of the first connecting part (100) is 20 mm to 25 mm; and / or, The hardness of the first connecting portion (100) is 28HA to 32HA; and / or, The draft angle A of the first connecting portion (100) is greater than 20°.

10. A pad printing device, characterized in that: It comprises the pad printing rubber head as claimed in any one of claims 1 to 9.

Images