Doll embryo with unchanged center of gravity during rotation, handicraft and printing method

Abstract

The application provides a doll embryo capable of keeping the barycenter unchanged during self-rotation of UV printing, a doll handicraft and a printing method thereof. The structure of the doll embryo is improved so that the barycenter position is kept unchanged during printing rotation, the position of spraying is ensured, and the amount of pigment is accurate. The doll embryo is used in combination with a UV printer to realize automatic and uniform batch spraying of a predetermined pattern, and a process of separately applying transparent varnish is not required. The doll handicraft produced has uniform and clear patterns, and the production efficiency is greatly improved. The product produced is no longer limited by the drawing skills of artisans, and diversified products can be produced. Compared with the prior art, the resolution of the image is significantly improved, the personalized customization demand of low-cost one-set subscription and high-resolution real photo is met, and even the surface pattern of the innermost doll is very delicate and lovely.

Description

TECHNICAL FIELD

[0001] The present application belongs to the art of artistic handicrafts, and particularly relates to a nesting doll embryo with an unchanged center of gravity during self-rotation, a nesting doll handicraft and a printing method. BACKGROUND

[0002] A nesting doll is a traditional set of dolls, also known as a "matryoshka" or "Russian nesting doll", which is derived from the Russian word "Матрёшка" and means "mother of a family" in ancient Greek. It is usually composed of a set of dolls of different sizes, each of which can be opened to accommodate a smaller doll. To make a high-quality nesting doll handicraft, the wood material needs to be strictly selected, the wood needs to be dried and made into a white blank, and then a skilled artist needs to draw a fine pattern on the surface of the white blank, and finally, the pattern needs to be protected by evenly applying a varnish. Due to the high dependence of the production of nesting dolls on manual labor, the high cost and time-consuming nature of the production process limit the production efficiency of nesting dolls and the expansion of the market for nesting dolls. In addition, the nesting dolls become smaller from the outside to the inside, and the difficulty of drawing or transferring the pattern on the inside doll in a limited space also increases accordingly, and the level of detail of the innermost doll is greatly reduced.

[0003] Some producers use transfer stickers to complete the pattern to simplify the production process. However, this method still relies on manual fixing and transferring of the stickers, and not only is the production efficiency low, but the resolution is also very limited, and only simple patterns can be produced, which cannot meet the demand for high-resolution photo-level patterns. Since stickers are usually prepared in batches, they cannot meet the needs of users for low-cost and personalized customization.

[0004] To improve efficiency and reduce production difficulty, some producers have also tried to use machine spraying. The current machine spraying technology for nesting dolls is not mature, and the resulting nesting dolls have uneven coatings, unclear patterns, and cannot print multiple patterns at the same time. Specifically, the shape of the nesting doll is usually imitated from a cartoon or an animal, and the resolution requirement for simple patterns is not high, and the head and body are imitated by changes in the outer contour line. Usually, except for the innermost doll, each layer of the doll can accommodate a smaller doll after the first and second main parts are disassembled, so the cross-section of the doll has the maximum diameter at the joint between the first and second main parts. Figure 1A doll disclosed in CN201264465Y is shown, the shell 1' of the doll is egg-shaped, including upper and lower two parts, the lower shell 2' is provided with a support base 4' at the bottom, and a pattern layer is arranged on the outer layer of each shell. The shell of the doll is symmetrical along the center line H', and the cross section of any point along the center line H' is circular. When viewed from the front of the doll, the diameter of the cross section corresponding to the shell 1' changes from small to large along the center line H' from top to bottom in the upper shell, and the cross section has the maximum diameter at the joint 3' between the upper and lower shells. Along the center line from top to bottom in the lower shell 2', the diameter of the cross section corresponding to the shell changes from large to small, and the cross section has the minimum diameter at the support base 4'.

[0005] Before machine spraying, the embryo is placed on the supporting device; when starting to spray, the doll embryo will rotate around the center line at a predetermined speed under the action of the supporting device. At the same time of rotation, the pigment spray head sprays to form a predetermined pattern or coating at a predetermined position. In practice, the doll embryo in the prior art will inevitably produce irregular changes in the center of gravity and deviation from the predetermined position with the rotation of the supporting wheel, which will cause deviation between the actual position of the pigment spraying and the preset position, resulting in distortion of the sprayed pattern and poor printing effect.

[0006] To avoid the deviation of the doll embryo during machine spraying, some producers use clamping devices at both ends of the embryo to reduce the irregular rotation of the doll embryo; however, there will be a large error by naked eye and manual clamping, and it is impossible to guarantee that the center line of the clamping device at both ends coincides with the H center line of the doll, resulting in irregular revolution during rotation printing, deviation between the actual position of the pigment spraying and the preset position, distortion of the sprayed pattern, and poor printing effect. Moreover, since the printer head can only move between the clamping devices, this scheme can only print a single doll, and for the commonly used doll with a maximum cross-sectional diameter of 8 to 30 mm, the side surface cannot be printed in one full circle, resulting in fragmentation of the pattern on the top and upper body of the doll and damage to the ornamental nature. In addition, manual fixing and disassembling of the embryo are required before and after printing of each embryo, which greatly limits the production efficiency. To realize batch printing, some producers choose to punch holes at both ends of the embryo, and the fixed rotating shaft passes through multiple doll embryos at the same time, but the punching operation not only damages the handicraft itself, but also increases the additional punching and fixing processes, which affects the appearance of the product and reduces the production efficiency. SUMMARY

[0007] In view of this, the application proposes a doll embryo using UV printing technology and having a constant center of gravity during self-rotation, a doll craft and a printing method thereof. The application improves the structure of the doll embryo to keep the center of gravity unchanged during printing rotation, ensuring the position of spraying and the accuracy of the amount of pigment. Using the doll embryo of the application, the UV printer can automatically and uniformly spray the predetermined pattern in batches, and the produced doll crafts have uniform and clear patterns, effectively improving the production efficiency and eliminating the need for a separate transparent varnish coating process. In addition, the printing method proposed by the application can automatically spray the generated pattern, and the products produced are no longer limited by the drawing skills of artisans, and can produce diversified products. At the same time, compared with the prior art, the resolution of the image has been significantly improved, meeting the personalized customization needs of low-cost one-set subscription and high-resolution real photo, and even the surface pattern of the innermost doll is very delicate and lovely.

[0008] The application proposes a doll embryo having a constant center of gravity during self-rotation, which comprises at least a first main body part (1), a second main body part (2) and a center line (H). The first main body part (1) and the second main body part (2) are connected at a joint (3). The cross section of any point on the doll embryo is circular, and the center of the circle is located on the center line (H). The first main body part (1) of the doll embryo comprises a top part (101) and an upper body part (102). When printing, the doll embryo is placed on the transmission shaft of a UV printer. The side of the doll embryo comprises at least four contact points, each of which is in contact with at least two contact points. The difference between the diameters of the cross sections corresponding to any two of the contact points is less than or equal to a first preset value, and the ratio of the difference to the overall height (L) of the doll embryo is less than or equal to the first preset value.

[0009] Along the direction of the center line (H), the distance between the centers of the two cross sections corresponding to any two of the contact points is greater than 5% of the overall height (L) of the doll embryo.

[0010] Further, the doll embryo is made of plastic or resin material, and the first preset value is 5%. Alternatively, the doll embryo is made of wood material, and the first preset value is 1%.

[0011] Further, the second main body part (2) comprises a lower body part (201), which comprises a first lower body part (2011) and a second lower body part (2012). The height ratio of the first lower body part (2011) to the lower body part (201) is greater than one-third.

[0012] Further, when the arc height (A) of the top portion (101) is between 0 mm and 100 mm, the top portion (101) and the upper body portion (102) are printed respectively, and the patterns printed on the top portion (101) and the upper body portion (102) cover each other.

[0013] Further, when the arc height (A) of the top portion (101) is greater than or equal to 20 mm, the top cover portion (1011) and the top side surface (1012) of the top portion (101) are printed respectively, wherein the patterns printed at the connection between the top cover portion (1011) and the top side surface (1012) cover each other.

[0014] Further, the first main body portion (1) is formed with a first included angle towards the inside of the doll embryo along the vertical direction of the center line (H), and the first included angle is less than 30 degrees.

[0015] Further, the second main body portion (2) is formed with a second included angle towards the inside of the doll embryo along the vertical direction of the center line (H), and the second included angle is less than 30 degrees.

[0016] When the first main body portion (1) and the second main body portion (2) are formed with included angles at the joint, the sum of the first included angle and the second included angle is less than 60 degrees.

[0017] Further, the maximum cross-sectional diameter of the doll embryo is between 8 mm and 30 mm.

[0018] Further, the front surface of the doll embryo is white before printing.

[0019] Further, the upper body portion (102) and the second main body portion (2) respectively have at least one point in contact with the transmission shaft, and the maximum cross-sectional diameter corresponding to the contact point of the upper body portion (102) is a first diameter (R1), wherein the ratio of the difference between any two cross-sectional diameters on the upper body portion (102) and the first diameter (R1) is less than or equal to 1%.

[0020] Further, the maximum cross-sectional diameter corresponding to the contact point of the second main body portion (2) is a second diameter (R2), and the second main body portion (2) includes a lower body portion (201), and the lower body portion (201) includes a first lower body portion (2011) and a second lower body portion (2012), wherein the ratio of the difference between any two cross-sectional diameters on the first lower body portion (2011) and the second diameter (R2) is less than or equal to 1%.

[0021] Another aspect of the present application also provides a preparation method of a nesting doll artware, which uses the aforementioned nesting doll embryo. Before UV printing, the nesting doll embryo is placed on the bottom transmission shaft of a UV printer, and the first main part (1) and the second main part (2) are printed simultaneously after being connected, or the first main part (1) and the second main part (2) are printed respectively before being connected.

[0022] Another aspect of the present application also provides a nesting doll artware, which uses the aforementioned nesting doll embryo. In the nesting doll artware, at least two layers of nesting dolls adopt the nesting doll embryo.

[0023] The nesting doll embryo provided by the present application can ensure that the center of gravity remains unchanged during the transmission process when the machine is coloring / polishing oil, ensure that the spraying of pigments and polishing oil is uniform, and reduce the production difficulty. At the same time, using the nesting doll embryo and the printing method of the present application can mass-produce and print high-resolution patterns, which do not depend on hand-drawing by artists, do not need to set up a separate polishing oil spraying process, and do not need to be dried, thereby simplifying the process and reducing production costs. Preferably, during the printing process, there is no need to stop the machine. For nesting dolls with a cross-sectional diameter of 8 mm to 400 mm, one-time batch printing of the side surface in one circle can be realized. For nesting dolls with an arc height A of 0 mm to 100 mm, when spraying colored paint or transparent polishing oil to the top, the coverage is wide and the spraying is uniform. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical problems solved by the embodiments of the present application, the technical means adopted and the technical effects achieved more clear, the specific embodiments of the embodiments of the present application will be described in detail below with reference to the drawings. However, it should be declared that the drawings described below are only the drawings of exemplary embodiments of the embodiments of the present application, and for those skilled in the art, other drawings of embodiments can be obtained from these drawings without creative labor.

[0025] Figure 1 is a structural schematic diagram of a one-layer nesting doll in the prior art.

[0026] Figure 2 is a schematic diagram of a support device used in an embodiment of the present application.

[0027] Figure 3 is a state diagram of the actual work of the support device used in an embodiment of the present application.

[0028] Figure 4 is a structural schematic diagram of a one-layer nesting doll in an embodiment of the present application.

[0029] Figure 5 is a structural schematic diagram of a one-layer nesting doll in an embodiment of the present application.

[0030] Figure 6is a schematic view of a layer of nesting doll in contact with the rotating shaft in an embodiment of the present application.

[0031] Figure 7 is Figure 5 is a partial enlarged view of the joint 3.

[0032] Figure 8 is a comparison diagram of a small-sized nesting doll art in an embodiment of the present application and a nesting doll art of the prior art.

[0033] Figure 9 is a comparison diagram of a nesting doll art in another embodiment of the present application and a nesting doll art of the prior art.

[0034] Reference signs: 1' nesting doll housing, 2' lower housing, 3' joint, 4' support base, H' center line, 1 first main part, 101 top part, 1011 top cover part, 1012 top side, 102 upper body part, 2 second main part, 201 lower body part, 2011 first lower body part, 2012 second lower body part, 202 bottom part, 3 joint, 4 fixed frame, 5 rotating shaft, 6 support wheel, 7 adjusting device, 701 rotating wheel, 702 lifting device, 703 back plate, H center line. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0036] Under the premise of conforming to the technical concept of the embodiments of the present application, the features, structures, characteristics or other details described in a certain specific embodiment can not be excluded from being combined in one or more other embodiments in a suitable manner.

[0037] In the description of the specific embodiments, the features, structures, characteristics or other details described in the embodiments of the present application are to enable those skilled in the art to fully understand the embodiments. However, it does not exclude that one or more of the skilled in the art can practice the technical solutions of the embodiments of the present application without the specific features, structures, characteristics or other details.

[0038] It should be understood that although the first, second, third, etc. represent the numbered adjectives used herein to describe various devices, elements, components or parts, this should not be limited by these adjectives. These adjectives are used to distinguish one from another. For example, the first device can also be called the second device without deviating from the essential technical solutions of the embodiments of the present application.

[0039] The term "and / or" or "and / or" includes all combinations of any one and one or more of the associated listed items.

[0040] As Figure 2 shown, in order to avoid the doll embryo deviating from the center of gravity rotation with the rotation of the support wheel, the applicant tries to improve the support structure. The foregoing support structure includes a fixed frame 4, a rotating shaft 5, a support wheel 6 and an adjusting device 7. Among them, the left and right two rotating shafts 5 and the adjusting device 7 are connected with the fixed frame 4 respectively, the distance between the two rotating shafts is designed according to the size of the doll, to ensure that the doll is stably supported while avoiding falling from the gap of the rotating shaft. Further, the support wheel 6 is sleeved on the rotating shaft 5 and can move along the axial direction of the rotating shaft, and the support position is adjusted according to the structure of the doll. As Figure 3 shown, a plurality of fixed frames 4 and support wheels 6 can be connected on the same rotating shaft 5, one end of the rotating shaft is connected with a stepping motor (not shown); a doll can be placed between the two fixed frames 4 and a pair of support wheels 6, and the support device can drive multiple dolls to rotate simultaneously under the drive of the motor.

[0041] The adjusting device 7 is connected with the fixed frame 4, and two rotating wheels 701 and a lifting device 702 are arranged on the adjusting device 7. The lifting device 702 is used to adjust the height of the rotating wheel 701. Exemplarily, the rotating wheel is clamped in the sliding groove of the lifting device 702 through the back plate 703: when the handle of the lifting device is rotated clockwise, the rotating wheel rises along the sliding groove; on the contrary, the rotating wheel descends along the sliding groove.

[0042] Figure 3 The state diagram using the foregoing support device is also shown in the specification. Before spraying, the doll embryo is placed on the support structure, the position of the support wheel 6 is adjusted so that the two ends of the doll embryo are in uniform contact with the rotating wheel 701 and the support wheel 6 respectively and keep balance, the height of the rotating wheel 701 is adjusted by the lifting device 702, so that the doll keeps a horizontal state on the support structure, and the height difference of the side profile line of the doll embryo is eliminated. Preferably, the application sets a non-slip pad on one week of the support wheel 6, to avoid the doll embryo from sliding during printing. Before using the support device each time, the user needs to adjust the height of the rotating wheel 701 to ensure that the doll keeps parallel with the rotating shaft 5 during rotation.

[0043] The original intention of designing the foregoing support device is to solve the problem of unstable center of gravity of the traditional doll during self-rotation. However, through experiments, it is found that the use of the foregoing support device cannot realize synchronous angular displacement, nor can it keep the center of gravity unchanged during self-rotation; and because the contact area between the traditional doll and the transmission shaft is limited and the friction is smaller than the rotating force, the phenomenon of slipping occurs during printing. When applied to a doll with a cross-sectional diameter less than 50 mm, the phenomenon of slipping is more obvious because the self-weight of the doll becomes lighter, resulting in smaller friction. In addition, it is difficult to accurately adjust the center line of the doll H to be parallel with the transmission shaft by relying on the naked eye and manual work. Although this technical solution solves the problem of the prior art to some extent, its application scenarios are limited.

[0044] In practice, it is found that when the side curve of the nesting embryo has a large gap, the droplets of paint are easy to spread, resulting in uneven coating and unclear pattern. In this embodiment, when the difference between the diameters of the cross sections corresponding to any two points of the nesting embryo is controlled within a predetermined value, the uniformity and pattern clarity of the machine coloring and spraying of light oil can be greatly improved. At the same time, the diameter difference within the predetermined range does not affect the smooth contact between the nesting embryo and the support structure, and the nesting embryo can still rotate stably under the driving of the shaft, ensuring the printing effect.

[0045] The present application provides a nesting embryo as shown in Figure 4 The nesting embryo comprises at least a first main part 1, a second main part 2 and a center line H, the first main part 1 and the second main part 2 are detachably connected at the joint 3, and after being separated, they can accommodate a nesting smaller than themselves; wherein the first main part 1 and the second main part 2 of the nesting are symmetrical along the center line H, that is, the cross section corresponding to any point on the nesting embryo is circular and the center is located on the center line H, and the first main part 1 of the nesting embryo comprises a top 101 and an upper body part 102. When printing, the nesting embryo is placed on the left and right transmission shafts of the UV printer, the side of the nesting embryo comprises at least four contact points, each of the transmission shafts contacts at least two contact points, and the ratio of the difference between the diameters of the cross sections corresponding to any two of the contact points to the overall height L of the nesting embryo is less than or equal to a first predetermined value.

[0046] In the direction of the center line H, the distance between the centers of the two cross sections corresponding to any two of the contact points in the cross sections is greater than 5% of the overall height L of the nesting embryo.

[0047] In an ideal case, the center line H is completely parallel to the transmission shaft of the printer, at this time the contact points of the nesting embryo are located on the maximum cross sections of the first and second main parts. In actual cases, due to uneven distribution of the weight of the nesting embryo (as shown in Figure 6 ), the center line H and the transmission shaft (see Figure 6 horizontal dotted line) of the printer will have a small angle, at this time the contact points of the nesting embryo are not located on the maximum cross sections of the first and / or second main parts, that is, the diameters of the cross sections corresponding to the contact points are not the maximum diameters of the embryo.

[0048] When the nesting embryo with the above structure is used for UV printing, the side of the nesting embryo is placed horizontally on the transmission shaft of the printer, and the transmission shaft supports and drives the nesting to rotate, the center of gravity of the embryo can remain stable, that is, the spatial relative position of the center line of the nesting embryo and the transmission shaft can always remain unchanged.

[0049] When the aforementioned nested doll embryo is used for UV printing, the nested doll embryo is placed on the bottom transmission shaft of the UV printer. The first body part 1 and the second body part 2 can be printed separately to avoid the paint from curing and adhering at the joint 3; and a process of applying transparent varnish is not required, thereby simplifying the process and reducing the production cost. Alternatively, the first body part and the second body part can be connected and printed simultaneously, which is not limited in the present application.

[0050] Further, the nested doll in the prior art is mostly made of solid wood, which not only wastes forest resources, but also has the following disadvantages: it is prone to mold in the humid season and prone to cracking in the dry season; sawdust is prone to remain on the nested doll during the processing, which affects the respiratory health; and the finished product is prone to have small burrs that can prick the skin. The material of the nested doll embryo of the present application can be non-wood, such as plastic, specifically resin, ABS, PC, etc., which can overcome the aforementioned disadvantages by replacing the material, thereby reducing the raw material cost and being more environmentally friendly. When the nested doll embryo is made of plastic or resin, the preset value is 5%; when the nested doll embryo is made of wood, the preset value is 1%.

[0051] Further, in the direction of the center line H, the ratio of the distance between the centers of the two farthest cross-sectional circles in any two of the contact points to the overall height L of the nested doll embryo is greater than 5%. When the nested doll embryo of the aforementioned structure is driven to rotate by the support structure, the stress is more balanced and the rotation is stable.

[0052] Alternatively, the present application can use a cylindrical support shaft to replace the support structure of the aforementioned support wheel and rotating wheel. Specifically, during processing, the nested doll embryo is placed between the left and right support shafts; the nested doll embryo rotates by the same angle under the driving of the rotating shaft, thereby achieving self-rotation with an unchanged center of gravity.

[0053] Preferably, the second body part 2 further comprises a lower body part 201, and the lower body part 201 comprises a first lower body part 2011 and a second lower body part 2012, wherein the ratio of the height of the first lower body part 2011 to the lower body part 201 is greater than 1 / 3. The diameters of the cross sections corresponding to the first lower body part 2011 are substantially the same, and the diameters of the cross sections corresponding to the second lower body part 2012 are not limited in the present application.

[0054] Preferably, the top part 101 and the upper body part 102 of the nested doll embryo are smoothly connected. The top part 102 of the nested doll embryo can be an arc structure or a flat top structure. The arc structure is as shown in FIGS. 1A and 1B, and the flat top structure is as shown in FIG. 1C. Figure 1 and Figure 5 From the front of the nested doll, the aforementioned top part 102 of the nested doll has a structure in which the top is high and the sides are low; and the flat top structure is as shown in FIG. 1C. Figure 4As shown, from the front of the doll, the contour line of the top portion 102 is parallel to the cross section of the doll embryo until the transition position where the top portion 102 is connected to the upper body portion 102 changes to an arc line. For example, the diameter of the cross section corresponding to the top portion 101 can gradually decrease at a distance of 3 from the joint; along the direction of the center line H, the arc height of the top portion 101 is A.

[0055] When the arc height A of the top portion 101 is between 0 mm and 100 mm, the top portion 101 and the upper body portion 102 are printed respectively, and the patterns printed by the top portion 101 and the upper body portion 102 cover each other, realizing a natural transition and ensuring the beauty of the printed pattern (such as Figure 5 indicated by the middle shaded part S).

[0056] In practice, it is found that when the arc height A of the top portion 101 exceeds 20 mm, the height difference exceeds the working distance of the UV printer nozzle, and high-resolution patterns cannot be printed. Further, when the arc height A of the top portion 101 is greater than or equal to 20 mm, the top portion 101 can be printed separately. Specifically: the top portion 101 is divided into a top cover portion 1011 and a top side portion 1012 for separate printing, wherein the area ratio of the top cover portion 1011 and the top side portion 1012 can be adjusted according to actual conditions; similar to the separate printing technology described above, the patterns printed at the connection between the top cover portion 1011 and the top side portion 1012 cover each other, avoiding white spaces at the connection and ensuring the printing effect.

[0057] Optionally, the second main body portion 2 further comprises a base portion, and the lower body portion 201 is smoothly connected to the base portion. Preferably, from the front of the doll, the bottom 202 of the base portion is parallel to the cross section of the doll embryo, facilitating stable placement of the doll and preventing it from falling over.

[0058] The doll artwork includes an innermost doll and multiple outer dolls, wherein the outer doll is a hollow structure composed of a detachable first portion and a second portion. The innermost doll can be a solid structure or a hollow structure similar to the outer doll, which is not limited by the present application.

[0059] Optionally, any layer of the doll artwork can adopt any of the doll embryos described above, and the structure of each layer of the doll can be completely the same, partially the same, or different. Each layer of the doll can be adjusted according to actual design, as long as the inner layer doll can be accommodated in the outer layer doll, which is not limited by the present application.

[0060] In the prior art, the first main body part and the second main body part may be deformed (shrink) at the joint due to the influence of weather, humidity, geographical environment and processing technology, and cannot form a tight connection. The gap at the joint not only affects the appearance, but also cannot guarantee the stability of the connection. The deformation (expansion) at the joint can also cause the friction to increase, making it difficult to open. Preferably, an included angle is formed at the joint between the first main body part 1 and / or the second main body part in the vertical direction of the center line H towards the inside of the doll embryo. When the included angle is formed on one side of the first main body part 1 or the second main body part, the angle is less than 30°. When the first main body part 1 and the second main body part simultaneously form an included angle at the joint, the sum of the two included angles is less than 60°. By providing an included angle at the joint, excessive deformation at the joint is prevented.

[0061] Exemplarily, Figure 5 The partial enlarged view of the joint 3 is as shown in Figure 7 (A) -7 (C) shows that in Figure 7 (A), the first main body part 1 forms a first included angle a in the vertical direction of the center line H towards the inside of the doll embryo, and the second main body part 2 forms a second included angle β in the vertical direction of the center line H towards the inside of the doll embryo, wherein the sum of the first included angle a and the second included angle β is less than 60 degrees.

[0062] In Figure 7 (B), the first included angle a is 0 degrees, and the second included angle β is preferably less than 30 degrees.

[0063] In Figure 7 (C), the second included angle β is 0 degrees, and the first included angle a is preferably less than 30 degrees.

[0064] Optionally, the maximum cross-sectional diameter of the doll embryo is between 8 mm and 30 mm. The structure of the prior art doll embryo cannot be used for UV printing. The structure of the present application can be applied to UV printing, improving the precision.

[0065] Optionally, the surface of the doll embryo before printing is white. Setting the surface to white improves the color reproduction and pattern clarity, and saves the amount of white paint and printing time.

[0066] Optionally, the upper body part 102 and the second main body part 2 respectively have at least one contact point with the transmission shaft, and the maximum cross-sectional diameter corresponding to the contact point of the upper body part 102 is a first diameter R1, wherein the ratio of the difference between any two cross-sectional diameters of the upper body part 102 to the first diameter R1 is less than or equal to one percent.

[0067] Furthermore, the diameter of the largest cross-section corresponding to the contact point of the second main body 2 is the second diameter R2. The second main body 2 includes a lower body 201, which includes a first lower body 2011 and a second lower body 2012. The ratio of the difference between any two cross-sectional diameters on the first lower body 2011 to the second diameter R2 is less than or equal to one percent.

[0068] In this embodiment, by controlling the ratio of the difference in diameter of the cross-sections corresponding to any two points of the upper body 102 and / or the first lower body 2011 to the ratio of the first diameter R1 to the second diameter R2 to less than or equal to one percent, the uniformity and clarity of the pigment and varnish on the blank can be improved. Simultaneously, it ensures stable rotation of the matryoshka doll blank under the drive of the rotating shaft, ensuring the printing effect. For standard rectangular planar patterns in customers' mobile phones or cameras, this application can print the main pattern of the photo on the upper body 102 and the first lower body 2011, eliminating pattern deformation caused by cross-sections of different perimeters in traditional matryoshka dolls.

[0069] Alternatively, the craft set can have 3, 5, or more layers. The number of layers in the craft set can be adjusted according to the actual design, and this application does not impose any restrictions.

[0070] like Figures 8-9 As shown, the small-sized nesting dolls made from the nesting doll blank of this application ( Figure 8 (Right) Compared to existing technologies ( Figure 8 The left side has the following advantages: When printing with existing matryoshka doll blanks, the center of gravity cannot be kept constant, resulting in misaligned and blurred patterns; especially for matryoshka dolls with a maximum cross-sectional diameter of less than 30 mm, multiple manual rotations are required during the printing process, and the error gradually accumulates with each rotation, resulting in rough and distorted patterns; in contrast, the matryoshka doll crafts prepared in this application ( Figure 9 It can print not only fine, high-resolution patterns, but also maintain the same high-quality printing effect even for the smallest nesting dolls on the innermost side.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A nesting doll blank whose center of gravity remains unchanged during rotation, the nesting doll blank comprising at least a first main body part (1), a second main body part (2), and a center line (H), the first main body part (1) and the second main body part (2) being connected at a seam (3), the cross-section corresponding to any point on the nesting doll blank being circular with its center located on the center line (H), characterized in that, The first main body (1) of the nesting doll blank includes a top (101) and an upper body (102). During printing, the nesting doll blank is placed on the left and right drive shafts of the UV printer. The side of the nesting doll blank includes at least four contact points, wherein each drive shaft contacts at least two of the contact points. The ratio of the difference in diameter of the cross section corresponding to any two contact points to the overall height (L) of the nesting doll blank is less than or equal to a first preset value. Along the center line (H), the distance between the centers of the two cross-sections that are furthest apart from each other in any two contact points is greater than 5% of the overall height (L) of the matryoshka doll body. The matryoshka doll blank is made of plastic or resin, with the first preset value being 5%; or the matryoshka doll blank is made of wood, with the first preset value being 1%.

2. The nesting doll blank as described in claim 1, characterized in that, The second main body (2) includes a lower body (201), which includes a first lower body (2011) and a second lower body (2012), wherein the height ratio of the first lower body (2011) to the lower body (201) is greater than one-third.

3. The nesting doll blank as described in claim 1, characterized in that, When the arc height (A) of the top (101) is between 0 mm and 100 mm, the top (101) and the upper body (102) are printed respectively, and the patterns printed on the top (101) and the upper body (102) overlap each other.

4. The nesting doll blank as described in claim 3, characterized in that, When the arc height (A) of the top (101) is greater than or equal to 20 mm, the top cover (1011) and the top side (1012) of the top (101) are printed respectively, wherein the patterns printed at the connection between the top cover (1011) and the top side (1012) overlap each other.

5. The nesting doll blank as described in any one of claims 1-4, characterized in that, The first main body (1) forms a first included angle along the direction perpendicular to the center line (H) toward the inside of the nesting doll blank, and the first included angle is less than 30 degrees; And / or the second main body (2) forms a second included angle in the direction perpendicular to the center line (H) toward the inside of the nesting doll blank, the second included angle being less than 30 degrees; When the first main body part (1) and the second main body part (2) simultaneously form an angle at the joint, the sum of the first angle and the second angle is less than 60 degrees.

6. The nesting doll blank as described in any one of claims 1-4, characterized in that, The maximum cross-sectional diameter of the nesting doll blank is between 8 mm and 30 mm.

7. The nesting doll blank as described in any one of claims 1-4, characterized in that, The surface color of the matryoshka doll blank is white before printing.

8. The nesting doll blank as described in any one of claims 1-4, characterized in that, At least one point on the upper body (102) and the second main body (2) respectively contacts the drive shaft. The diameter of the largest cross-section corresponding to the contact point of the upper body (102) is the first diameter (R1). The ratio of the difference between any two cross-sectional diameters on the upper body (102) to the first diameter (R1) is less than or equal to one percent. The diameter of the largest cross section corresponding to the contact point of the second main body part (2) is the second diameter (R2). The second main body part (2) includes a lower body part (201), which includes a first lower body part (2011) and a second lower body part (2012). The ratio of the difference between any two cross section diameters on the first lower body part (2011) to the second diameter (R2) is less than or equal to one percent.

9. A method for preparing a matryoshka doll craft, comprising UV printing using a matryoshka doll blank according to any one of claims 1-8, characterized in that, Before UV printing, the matryoshka doll blank is placed on the bottom drive shaft of the UV printer, and the first main body part (1) and the second main body part (2) are connected and printed simultaneously, or the first main body part (1) and the second main body part (2) are printed separately before connection.

10. A type of matryoshka doll craft, characterized in that, The preparation method according to claim 9 is used, wherein at least two layers of the nesting doll are made using the nesting doll blanks according to any one of claims 1-8.

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