Complex curved surface panda stuffed toy two-dimensional opening method based on parameterized model

Abstract

The invention discloses a two-dimensional plate opening method for a complex curved surface panda stuffed toy based on a parameterized model. The method comprises the following steps: constructing a parameterized design system taking the head circumference of the toy as a reference centimeter; based on the reference centimeter, coordinates, line segment lengths and angles of all key positioning points of the head film, the chest film and the back film are calculated through a plurality of preset proportionality coefficients, and the proportionality coefficients are multiples or scores of the reference centimeter; performing geometric drawing according to the coordinates, the length of the line segment and the angle, and connecting the key points by using an arc line to form a net template with a complex curved surface; and externally placing a seam allowance on the basis of the net template to generate a wool template. According to the two-dimensional plate opening method, a digital algorithm is adopted, the toy is made to be high in accurate restoration image degree, the head proportion of the panda, the curvature radian of parts and other characteristics are accurately controlled through the digital algorithm, the size is adjusted in a parameterized mode, the plate making accuracy is improved, the loss of sample making materials is reduced, and the labor-hour cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of plush toy design and manufacturing, and in particular to a two-dimensional pattern-making method for complex curved surface panda plush toys based on parametric sizing. Background Technology

[0002] Pandas, with their unique and endearing appearance, have become a highly representative design theme in plush toys. However, panda designs contain many complex curved surfaces, such as a rounded head, a full body, and a distinctive nose and mouth. How to faithfully transform these three-dimensional shapes into two-dimensional cut pieces that can be industrially produced, i.e., "pattern making," has always been a core technology and challenge in the plush toy manufacturing industry.

[0003] Currently, the traditional panda plush toy pattern making industry mainly relies on the manual experience of master craftsmen and repeated sampling. This model has the following drawbacks: it is difficult to restore the proportions accurately, and experience is hard to quantify precisely, which can easily lead to disproportionate head and body proportions and distorted facial features, requiring multiple sampling adjustments; the shape control is poor, resulting in insufficient three-dimensionality after stuffing, and the abdomen may collapse and the limbs may become stiff; the fabric compatibility is weak, as traditional methods do not fully consider the direction and stretch of plush fabric, resulting in the plush curling up after cutting and deviations in the size of the finished product; production efficiency and consistency are low, as the splicing of multiple pieces relies on manual alignment, resulting in a high error rate; there is serious repetitive work and material waste, and any pattern adjustment requires almost a complete redrawing.

[0004] Therefore, there is an urgent need in this field for an innovative pattern-making method that can systematically solve the above problems. This method should be able to accurately analyze and reproduce complex curved surface shapes using quantifiable technical means, effectively reducing reliance on personal experience, improving the accuracy, efficiency, and consistency of pattern making, and adapting to modern digital production processes, thereby meeting the growing market demand for high-fidelity panda plush toys. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned methods for creating patterns for panda plush toys, this invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a two-dimensional pattern-making method for complex curved surface panda plush toys based on digital algorithms. The purpose is to reduce the difficulty of pattern making, simplify the pattern-making steps, and improve the fabric utilization rate by adopting digital algorithm pattern making.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution, including the following steps: Step S110: Construct a parametric design system based on the toy's head circumference in centimeters.

[0008] Step S120: Based on the reference centimeter, calculate the coordinates, line segment lengths, and angles of all key positioning points of the headpiece, chest piece, and back piece using multiple predetermined scaling factors, where the scaling factors are multiples or fractions of the reference centimeter.

[0009] Step S130: Perform geometric drawing based on the coordinates, line segment lengths and angles, and use arcs to connect key points to form a clean pattern with a complex curved surface; extend the seam allowance on the clean pattern to generate a rough pattern.

[0010] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the head piece is designed with a one-piece symmetrical structure, wherein the axis is a fold line, and multiple curvature structural units controlled by a proportional coefficient are constructed on both sides of the central axis. The curvature structural units include at least the rear head foot dart, the head piece body curvature, the nose curvature and the mouth curvature, so as to simulate the curvature of the panda's head in three dimensions.

[0011] The curvature structure units in the headpiece are constructed in the following way: starting from a reference point, using line segments of equal length as radii, and dividing the area based on a specific angle calculated by a scaling factor, and then connecting them with arcs through the perpendicular bisectors of each line segment and the convexity control points, thereby forming a high-fidelity head surface contour.

[0012] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the back panel is designed using a one-piece structure integrally formed with the external arm panel and external leg panel, wherein: The external arm piece is formed by embedding a geometric body with a side length defined by a scaling factor at the shoulder position of the back piece, and by perpendicularly bisecting and controlling the convexity of each side to create the curvature of the arm hole.

[0013] The external leg piece is formed by embedding a geometric shape with side length and angle defined by a scaling factor at the lower end of the back piece, and by vertically bisecting its key sides and controlling its convexity to form the leg curvature.

[0014] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the two-dimensional pattern making method further includes generating independent net patterns of inner arm pieces and inner leg pieces respectively by contour mapping based on the structural diagrams of the outer arm piece and the outer leg piece.

[0015] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the chest X-ray is constructed by mapping the relative positions and contours of the armholes and legholes of the back piece to ensure precise matching of the chest X-ray and the back piece during sewing, and the underside structure of the chest X-ray is constructed by the angle and vertical bisector convexity control points controlled by the proportional coefficient.

[0016] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the plush toy is in the shape of a panda, and the outline structure of the head piece, chest piece, and back piece is specially designed to reproduce the complex curved surface features of the panda with high fidelity.

[0017] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the method is specifically applied to the cutting and sewing of ultra-soft short plush fabric. A fixed value seam allowance is evenly placed on the outer periphery of the sample. The seam allowance is 0.5 cm wide and is sewn using 301 stitch, flat stitch process, and a stitch length of 15 stitches / 2.5 cm.

[0018] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the reference centimeter is 12 centimeters. By adjusting the value of the reference centimeter and keeping the scaling factor unchanged, the size of the toy can be rapidly scaled up and serialized.

[0019] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, the final composition of the panda plush toy sample generated by the method includes: 2 back pieces, 2 chest pieces, 1 inner arm piece, 1 inner leg piece, 1 head piece, 4 ear pieces, 1 tail piece, and 2 foot pieces.

[0020] As a preferred embodiment of the coolable high UV aging test chamber of the present invention, when the program is executed by the processor, the two-dimensional pattern making process of the complex curved surface panda plush toy is automatically completed by running the two-dimensional pattern making method.

[0021] The beneficial effects of this invention are as follows: This invention employs digital algorithms to achieve high accuracy and realism in toy reproduction. By precisely controlling the proportions of the panda's head, the curvature of its components, and other features, the digital algorithm parametrically adjusts dimensions, avoiding human error and improving the accuracy of reproduction by over 40%. The digital algorithm supports rapid adjustments to size and posture, balancing standardized production with customization needs, while automatically verifying safety parameters to balance compliance and accurate representation. This invention uses digital algorithms to adjust pattern size and dimensions, reducing physical prototyping by 3-4 times and shortening the development cycle by 50%. It avoids plush curling and dimensional deviations, improving the flatness of the finished product. This invention uses digital algorithms to address the issue of inexperienced technicians operating toy pattern making. The overall pattern making technology uses centimeter-level calculations for each part, making toy pattern making predictable and easy for novice technicians to operate, breaking away from the experience-based approach. It improves pattern making accuracy and requires minimal technical skills from practitioners, being easy to learn and understand. The digital algorithm pattern can be directly connected to CNC cutting equipment, improving consistency in mass production, reducing material waste during prototyping by 60%, and lowering labor costs by 30%. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the headpiece structure of the present invention is shown; Figure 2 A schematic diagram of the back panel, tail, and foot panel structure of the present invention is shown; Figure 3 A schematic diagram of the chest radiograph structure of the present invention is shown; Figure 4 A schematic diagram of the net sample structure of the present invention is shown; Figure 5 A schematic diagram of the pattern template structure of the present invention is shown; Figure 6 A schematic diagram of the headpiece stitching of the present invention is shown; Figure 7 A schematic diagram of the stitching of the inner arm and inner leg pieces of the present invention is shown; Figure 8 A schematic diagram of the mounting head plate of the present invention is shown; Figure 9 A schematic diagram illustrating the fabrication of the nose, mouth, and tail of the present invention is shown. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0026] Example 1, referring to Figures 1-9 This is the first embodiment of the present invention, which provides a two-dimensional pattern-making method for complex curved surface panda plush toys based on parametric sizing. This method includes the following steps: Step S110: Construct a parametric design system based on the toy's head circumference in centimeters; Step S120: Based on the reference centimeter, calculate the coordinates, line segment lengths and angles of all key positioning points of the head, chest and back radiographs using multiple predetermined scaling factors. The scaling factors are multiples or fractions of the reference centimeter. Step S130: Perform geometric drawing based on coordinates, line segment lengths and angles, and use arcs to connect key points to form a clean pattern with complex curved surfaces; extend the seam allowance on the clean pattern to generate a rough pattern.

[0027] The head circumference of a panda plush toy was selected as the baseline in centimeters. Based on the calculated points, lines, and angles, geometric drafting was performed on software or paper. A precise net pattern was created by connecting these points (especially connecting key points with arcs, such as connecting points g, e8, and e6 with arcs to form the head piece curvature). A uniform 0.5 cm seam allowance was added to the outer perimeter of all net patterns to generate the raw pattern for actual cutting.

[0028] like Figures 4-5 As shown, the panda plush toy pattern making process involves creating numerous pattern pieces based on a clean pattern design, with a 0.5 cm (fixed value) seam allowance around the perimeter. The panda plush toy pattern consists of the following pieces: 2 back pieces, 2 chest pieces, 1 inner arm piece, 1 inner leg piece, 1 head piece, 4 ear pieces, 1 tail piece, and 2 foot pieces. These pieces are used in the production of the panda plush toy.

[0029] The panda plush toy is made of ultra-soft short plush, which boasts exceptional softness and luster, a delicate and smooth feel, and short, dense fibers that perfectly mimic the texture of panda fur, providing a warm and comfortable sensation. Before being made into a plush toy, the ultra-soft short plush undergoes four processing steps: first, desizing and refining to remove sizing and impurities; then, high-temperature pre-forming to stabilize dimensions; next, dyeing with environmentally friendly dyes (such as the black and white panda color scheme), followed by reactive or digital printing as needed; then, friction using a pile-forming machine to create uniform short fibers, followed by straightening with a combing machine; then, padding with a softener to enhance the feel, and spraying with an antistatic agent to reduce static electricity; finally, a second setting to fix the state, and testing for colorfastness, safety (formaldehyde, heavy metals, etc.), and feel to ensure the fabric is soft, stable, and meets toy standards.

[0030] Furthermore, the plush toy is shaped like a panda, and the outlines of its head, chest, and back pieces are designed specifically to faithfully reproduce the complex curved features of a panda.

[0031] The outline structure of the head piece (rounded head, nose, and mouth), chest piece (full chest), and back piece (torso with arms and legs) generated by the two-dimensional pattern-making method in this embodiment is specifically designed to reproduce the biological morphological characteristics of pandas with high fidelity, such as their round body, unique head proportions, and sitting posture, which are different from the patterns of other ordinary animal plush toys.

[0032] Furthermore, the two-dimensional pattern-making method of this embodiment is specifically applied to the cutting and sewing of ultra-soft short plush fabric. A fixed value seam allowance is evenly placed around the outer periphery of the pattern. The seam allowance is 0.5 cm wide and is sewn using 301 stitch, flat stitch, with a stitch length of 15 stitches / 2.5 cm.

[0033] Among them, such as Figures 6-9 As shown, the sewing includes head, body, arms, feet, ears, and the assembly of each component. Head sewing involves sewing adjacent curves of the headpiece together, and sewing the nose to the nostrils. Ear pieces are sewn using a tube sewing technique with added stuffing (similar to cotton stuffing), and the ears are inserted at point g and sewn. Body sewing involves sewing the back and chest pieces together, sewing line segments a1a6 and c7d together, a7b and d3d4 together, a3a2 and d6c9 together, sewing the front center line segment c8c9 of the chest piece (for both left and right pieces), and sewing the back center line segment aa3 of the back piece (for both left and right pieces). Arm sewing involves aligning the inner arm piece with the outer arm piece and sewing it together, and attaching the sleeve cap to the inner arm piece. Foot sewing involves aligning the inner leg piece with the outer leg piece and sewing it together, and sewing the inner leg piece to the thigh hollow. Foot sewing involves sewing the sole piece to line segment b8b9 around the perimeter. The sewn head is attached to the body. A 3cm opening is left at the midpoint of the back (line segment aa3) to fill with cotton (or small cotton filler) to plump up all parts of the panda. The 3cm opening is then hand-sewn closed. For the panda tail, a circular piece of fabric is cut, a sponge ball is wrapped around it, and the tail is hand-sewn and pulled down into a sphere, then attached 2.0cm from point a3. The panda eyes are attached by threading plastic eye studs through the fabric and securing them with pads on the back. The nose and lips are finished with embroidery. All sewing parameters are 301 stitch, flat stitch, with 15 stitches every 2.5cm.

[0034] Furthermore, the base centimeter is 12 centimeters. By adjusting the value of the base centimeter and keeping the scaling factor unchanged, the size of the toy can be rapidly scaled up and serialized.

[0035] In this specific implementation, the base centimeter is set to 12 centimeters. A scaling factor associated with the base centimeter is defined for each key dimension (length, angle) of the headpiece, chestpiece, and backpiece. For example, the scaling factor for the headpiece's central axis length e4h2 is 0.4, calculated as 0.4 × 12 = 4.8 centimeters. Based on this system, the coordinates, line segment lengths (e.g., e4e6 = 0.095 × 12), and angles (e.g., ∠e6ge9 = 4 × 12 degrees) of all positioning points (e.g., a1, e4, g, h5, etc.) are calculated using the scaling factor. To develop larger or smaller versions of the same panda toy, simply change the value of the base centimeter.

[0036] Furthermore, the final composition of the panda plush toy pattern generated by the two-dimensional pattern-making method in this embodiment includes: 2 back pieces, 2 chest pieces, 1 inner arm piece, 1 inner leg piece, 1 head piece, 4 ear pieces, 1 tail piece, and 2 foot pieces.

[0037] Specifically, the head circumference of a panda plush toy is used as the benchmark for all size calculations. In this embodiment, the benchmark centimeters are set to 12 centimeters. A pre-built library of proportion coefficients specifically developed for panda styling is invoked. These coefficients, multiples or fractions of the benchmark centimeters, have been optimized for precise shape control. All key geometric data for the head, chest, and back pieces are systematically calculated, including the relative positions of over 80 key positioning points and the lengths and angles of line segments. A head piece template is drawn using the determined data, starting with the central axis (fold line) to construct the main curved surface and facial features (nose, mouth). Finally, all key points are connected to form a complete, high-fidelity head piece template that reproduces the complex curved surface of the panda's head. The outer arm and leg pieces are integrated, resulting in a back piece template that includes the torso, outer arms, and outer legs. The basic outline of the chest piece is determined based on the outlines of the arm and leg openings in the back piece through mapping relationships, ensuring precise matching during sewing. The crotch structure is constructed, connecting all key points to form a chest piece template that perfectly corresponds to the back piece. Generate clean patterns for the ear, inner arm and leg pieces, tail, and foot pieces. Using the "offset" function of CAD software, uniformly offset the outer contours of all generated clean patterns by 0.5 cm. This seam allowance width is a fixed value and does not change with the toy's centimeter dimensions. This generates a rough pattern for actual cutting. The system compiles all rough patterns and generates a final cut piece list. Using a digital nesting system, all rough patterns are intelligently and efficiently laid out on virtual fabric, increasing fabric utilization from the traditional 60% to approximately 80%. To develop a series of products in different sizes, simply input a new head circumference reference centimeter. All predetermined proportions remain unchanged, and the system will automatically re-execute steps S120 to S130, instantly generating a complete set of rough patterns in the new centimeter, enabling rapid and accurate series development.

[0038] Example 2, refer to Figure 1This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: the headpiece is drawn using a one-piece symmetrical structure, with the central axis being a folded line. Multiple curvature structural units controlled by a scaling factor are constructed on both sides of the central axis. The curvature structural units include at least the back head foot dart, the main body curvature of the headpiece, the nose curvature, and the mouth curvature, to simulate the curvature of the panda's head in three dimensions. The curvature structural units in the headpiece are constructed in the following way: starting from a reference point, using line segments of equal length as radii, and dividing the area based on a specific angle calculated by the scaling factor, and then connecting them with arcs through the perpendicular bisectors of each line segment and the convexity control points, thereby forming a high-fidelity head surface contour.

[0039] Compared to Example 1, the back panel is further designed using a one-piece structure integrally formed with the outer arm panel and outer leg panel, wherein: The outer arm panel is formed by embedding a geometry with side lengths defined by a scaling factor at the shoulder position of the back panel, and by perpendicularly bisecting and controlling the convexity of each side to create the curvature of the arm hole. The outer leg piece is formed by embedding a geometry with side lengths and angles defined by a scaling factor at the lower end of the back piece, and by vertically bisecting its key sides and controlling its convexity to create the leg curvature.

[0040] The remaining structure is the same as that in Example 1.

[0041] Specifically, such as Figure 1 As shown, the base centimeter in this embodiment is 12 centimeters. Line segment e4-h2 is defined as the headpiece's central axis ( / fold line), with a length of e4-h2 = 4.8 centimeters, calculated as "0.4 × 12 centimeters". Line segment e4-e6 is perpendicular to line segment e4h2, with a length of e4-e6 = 1.14 centimeters, calculated as "0.095 × 12 centimeters". Points e3-e4-e5 form the rear headpiece's bottom sluice, with a sluice width of e4-e5 = 0.492 centimeters, calculated as "0.041 × 12 centimeters". The sluice height is e4-e3 = 1.44 centimeters, calculated as "0.12 × 12 centimeters". Line segment e4-e2 = 3.732 centimeters, calculated as "0.311 × 12 centimeters". Line segment e2-g is perpendicular to line segment e4-h2, and line segment e2-g = 1.296 cm, calculated using the method "0.108 × 12 cm". Connecting point g-e6 forms the base line of the head, and line segment e7-e8 perpendicularly bisects line segment g-e6, and line segment e7-e8 = 0.408 cm, calculated using the method "0.034 × 12 cm".

[0042] The curvature structure of the head piece is formed by connecting points g-e8-e6 with arcs. Let ∠e6-g-e9 = 48 degrees, calculated as "4 × 12 cm". ∠f3-g-e9 = 18.96 degrees, calculated as "1.58 × 12 cm". ∠f3-g-f7 = 52.92 degrees, calculated as "4.41 × 12 cm". ∠g5-g-f7 = 36 degrees, calculated as "3 × 12 cm". ∠g5-g-g8 = 39.96 degrees, calculated as "3.33 × 12 cm". Line segment g-e6 (3.74 cm, measured in the diagram) = g-e9 = g-f3 = g-f7, line segment e7-e8 = f1-f (perpendicular bisector of line segment g-e9) = f2-f4 (perpendicular bisector of line segment g-f3) = f6-f5 (perpendicular bisector of line segment g-f7) = 0.408 cm, calculated using the method "0.034 × 12 cm". Connect the point gf-e9 with an arc to form the curvature structure of the first piece. Connect the point g-f4-f3 with an arc to form the curvature structure of the first piece. Connect the point g-f5-f7 with an arc to form the curvature structure of the first piece. Line segment g-g5 = line segment g-g8 = 2.676 cm, calculated using the method "0.223 × 12 cm". Line segment g3-g4 ( / perpendicular bisector g-g5) = line segment g1-g2 ( / perpendicular bisector g-g8) = 0.24 cm, calculated using the method "0.02 × 12 cm". Connect points g-g4-g5 with an arc to form the curvature structure of the first section. Connect points g-g2-g8 with an arc to form the curvature structure of the first section. Draw a perpendicular line segment g8-h through point g8 from e4-h2. Using point h, cut off the width of the provincial highway upwards and downwards respectively: h-g9 = h-h1 = 0.15 cm, calculated using the method "0.0125 × 12 cm". Set ∠g-g8-h5 = 132 degrees, calculated using the method "11 × 12 cm". Line segment g8-h5 = 1.896 cm, calculated using the method "0.158 × 12 cm". Line segment h6-h7 perpendicularly bisects line segment g8-h5. Line segment h6-h7 = 0.324 cm, calculated using the method "0.027 × 12 cm". Connect the points g8-h7-h5 with an arc to form the nose's curvature structure.

[0043] Connect points h2-h5 with straight lines. Line segment h3-h4 perpendicularly bisects line segment h2-h5. Line segment h3-h4 = 0.276 cm, calculated as "0.023 × 12 cm". Connect points h2-h4-h5 with arcs to form the nose curvature structure. Set ∠g-g5-f9 = 144 degrees, calculated as "12 × 12 cm". Line segment g5-f9 = 1.2 cm, calculated as "0.1 × 12 cm". Line segment g7-g6 perpendicularly bisects line segment g5-f9. Line segment g7-g6 = 0.66 cm, calculated as "0.055 × 12 cm". Connect points g5-g6-f9 with arcs to form the mouth curvature structure. Line segment f7-f8 is perpendicular to line segment g-f7. Line segment f7-f8 = 1.344 cm, calculated as "0.112 × 12 cm". The straight line connecting points f9-f8 forms the chin structure.

[0044] The complete outline of the headpiece is formed by points e3-e5-e6-e8-gf-e9-f3-f4-g-f5-f7-f8-f9-g6-g5-g4-g-g2-g8-h7-h5-h4-h2. The headpiece is unfolded along the central axis segment e4-h2 to form a single structure, and then sewn along the line segment g9-g8-h1 to form the nose structure ( / pattern operation). The ear piece structure is similar to a semi-circle. Line segment i-i3 perpendicularly bisects line segment i1-i2. Line segment i-i3 = 1.296 cm, calculated using the method "0.108 × 12 cm". Line segment i1-i2 = 1.596 cm, calculated using the method "0.133 × 12 cm". Points i2-i3-i1 are connected by an arc to form the ear structure.

[0045] Example 3, referring to Figure 1 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the two-dimensional pattern making method further includes generating independent net patterns for inner arm pieces and inner leg pieces respectively by contour mapping based on the structural diagrams of the outer arm piece and the outer leg piece.

[0046] Compared to Example 2, the chest X-ray is further constructed by mapping the relative positions and contours of the armholes and legholes of the back piece to ensure precise matching of the chest X-ray and the back piece during suturing. The underside structure of the chest X-ray is constructed by angles and vertical bisector convexity control points controlled by proportional coefficients.

[0047] The remaining structure is the same as that in Example 2.

[0048] Specifically, such as Figure 2The diagram illustrates the drafting and pattern making for the back panel. A trapezoidal structure a-a1-a2-a3 is defined. Line segment a-a1 = 1.8 cm, calculated as "0.15 × 12 cm". Line segment a2-a3 = 3 cm, calculated as "0.23 × 12 cm". Line segment a-a3 = a1-a2 = 4.56 cm, calculated as "0.38 × 12 cm". The shoulder line segment a1-a6 = 0.45 cm, calculated as "0.0375 × 12 cm". A geometric shape a6-c3-c5-a7 is placed at point a6. One side of the geometric shape a6-a7 overlaps with line segment a1-a2. The geometric shape a6-c3-c5-a7 is used to draw the arm pattern. The geometric line segment a6-c3 = 1.632 cm, calculated as "0.136 × 12 cm". The geometric solid line segment c3-c5 = 1.164 cm, calculated using the method "0.097 × 12 cm". The geometric solid line segment c5-a7 = 2.52 cm, calculated using the method "0.21 × 12 cm". The geometric solid line segment a6-a7 = 1.44 cm, calculated using the method "0.12 × 12 cm". Line segment c2-i6 is the perpendicular bisector of line segment a6-c3; line segment c-c4 is the perpendicular bisector of line segment c5-c3; line segment c1-c6 is the perpendicular bisector of line segment c5-a7; line segment a8-a9 is the perpendicular bisector of line segment a6-a7; line segment c2-i6 = 0.18 cm, calculated using the method "0.015 × 12 cm". Line segment c-c4 = 0.456 cm, calculated using the method "0.038 × 12 cm". Line segment c1-c6 = 0.372 cm, calculated using the method "0.031 × 12 cm". Line segment a8-a9 = 0.552 cm, calculated as "0.046 × 12 cm". The arm's curvature structure is formed by connecting points a6-i6-c3 / c3-c4-c5 / c5-c6-a7 / a7-a9-a6 with an arc. The outer arm piece is attached to the back piece, and the inner arm piece is derived from the outer arm structure drawing. The inner arm's outline is formed by points a6-i6-c3-c4-c5-c6-a7-a9.

[0049] The lower end of the back panel has a leg structure, which is composed of the geometric shape b-b5-b8-b9-a2. The angle of the upper side of the geometric shape is set as ∠b-b5-b8 = 129.6 degrees, calculated as "10.8 × 12 cm". For example, the distance between the legs and the arm is a7-b = 0.624 cm, calculated as "0.052 × 12 cm". In the geometric shape b-b5-b8-b9-a2, ∠a2-b9-b8 = 90 degrees. One side b-a2 of the geometric shape b-b5-b8-b9-a2 is placed below the line segment a1-a2. The lengths of the sides of the geometric shape b-b5-b8-b9-a2 are b-b5 = 1.764 cm, calculated as "0.147 × 12 cm" and b5-b8 = 0.876 cm, calculated as "0.073 × 12 cm". Side length b8b9 = 1.86 cm, calculated as "0.155 × 12 cm". Side length b9a2 = 2.148 cm, calculated as "0.179 × 12 cm". Side length b-a2 = 2.004 cm, calculated as "0.167 × 12 cm". Line segment b4-b3 perpendicularly bisects line segment b-b5, line segment b6-b7 perpendicularly bisects line segment b8-b5, line segment b1-b2 perpendicularly bisects line segment b-a2, line segment b4-b3 = 0.1 cm ( / constant value), line segment b6-b7 = 0.192 cm, calculated as "0.016 × 12 cm". Line segment b1-b2 = 0.732 cm, calculated as "0.061 × 12 cm". Connect the points b-b3-b5 / b5-b7-b8 / b-b2-a2 with arcs to form the leg curvature structure. The outer leg pieces are attached to the back piece, and the inner leg pieces are derived from the outer leg piece structure drawing. The outline of the inner leg pieces is formed by points b-b3-b5-b7-b8-b9-a2-b2. The tail and foot pieces are part of the back piece structure and are used for sewing. Both the tail and foot pieces are circular structures. The tail radius is set to i4-i5=0.396 cm, calculated using the method "0.033×12 cm". The foot piece radius is h9-h8=0.6 cm, calculated using the method "0.05×12 cm".

[0050] like Figure 3The diagram illustrates the drafting and pattern making for a chest X-ray. In the trapezoidal structure a-a1-a2-a3, ∠a-a1-a2 = ∠c8-c7-d6 of the chest X-ray, and a1-a2 = c7d6, a1-a6 = c7d, a6-a7 = dd3, a7-b = d3d4, b-a2 = d4d6, a8-a9 = d2-d1, b1-b2 = d5-d7. The arcs a6-a9-a7 = dd1d3 and b-b2-a2 = d4-d7-d6 form the armholes and legholes of the chest X-ray. ∠c7-d6-c9 = 126 degrees, calculated as “10.5 × 12 cm”. The line segment d6-c9 = 3 cm, calculated as “0.25 × 12 cm”. Line segment d9-d8 perpendicularly bisects line segment d6-c9. Line segment d9-d8 = 0.24 cm, calculated using the method "0.02 × 12 cm". Connect points d6-d8-c9 with an arc to form the lower crotch structure of the chest radiograph. Line segment c7-c8 = 1.32 cm, calculated using the method "0.11 × 12 cm". Line segment e-e1 perpendicularly bisects line segment c8-c9. Line segment e-e1 = 0.408 cm, calculated using the method "0.034 × 12 cm". Connect points c8-e1-c9 with an arc to form the central structure of the chest radiograph. The outline of the chest radiograph is formed by points c8-c7-d-d1-d3-d4-d7-d6-d8-c9-e1.

[0051] A non-transitory computer-readable storage medium (such as a hard disk, optical disk, USB flash drive, or cloud server storage) storing a computer program. When the program is executed by a processor (such as a computer CPU), it performs the following automated process: receiving user input or calling a preset reference centimeter (such as 12 cm); calling a complete set of scaling factors (such as 0.4, 0.095, 0.041, etc.) stored in the program; and automatically executing all steps of the above embodiments 1-3, such as calculation, geometry construction, contour connection, and seam allowance. Finally, it outputs the pattern of the panda plush toy on the screen or directly drives a CNC cutting machine to cut out the two-dimensional pattern, thus completing the entire pattern-making process.

[0052] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims. Furthermore, for the purpose of providing a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features not relevant to the currently considered best mode for carrying out the invention, or those features not relevant to implementing the invention) may be omitted.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A two-dimensional cutting method for complex curved surface panda plush toy based on parameterized figure, characterized in that, The method comprises the following steps: Step S110: constructing a parameterized design system based on the head circumference of the toy; Step S120: based on the reference centimeter, calculating the coordinates, line segment lengths and angles of all key positioning points of the head piece, chest piece and back piece respectively through a plurality of predetermined scale factors, the scale factors being multiples or fractions of the reference centimeter; Step S130: performing geometric drawing according to the coordinates, line segment lengths and angles, and connecting the key points with arc lines to form a net sample version with complex curved surfaces; and outwardly extending the seam head on the basis of the net sample version to generate a rough sample version.

2. The two-dimensional cut-and-slit method according to claim 1, wherein: The drawing of the head piece adopts a one-piece symmetrical structure, wherein the axis is the folding line, and a plurality of curvature structure units controlled by the scale factors are constructed on both sides of the axis, the curvature structure units at least including a rear head bottom foot channel, a head piece main body curvature, a nose curvature and a mouth curvature, to simulate the panda head surface in three dimensions; The curvature structure units in the head piece are constructed by the following method: starting from the reference point, taking equal length line segments as radii, dividing the area based on specific angles calculated by the scale factors, and connecting the line segments with arc lines through perpendicular bisectors and convexity control points, to form a high-fidelity head surface profile.

3. The two-dimensional cut-and-slit method according to claim 2, wherein: The drawing of the back piece adopts a one-piece structure integrated with the external arm piece and the external leg piece, wherein: The external arm piece is constructed by embedding a geometric body with edge lengths defined by the scale factors at the shoulder position of the back piece, and performing perpendicular bisectors and convexity control on the edges to form arm hole curvatures; The external leg piece is constructed by embedding a geometric shape with edge lengths and angles defined by the scale factors at the lower end position of the back piece, and performing perpendicular bisectors and convexity control on the key edges to form leg curvatures.

4. The two-dimensional cut-and-slit method according to claim 1, wherein: The two-dimensional opening method further comprises generating independent net sample versions of the internal arm piece and the internal leg piece through contour mapping based on the structure diagrams of the external arm piece and the external leg piece.

5. The two-dimensional cut-and-slit method according to any one of claims 4, wherein: The drawing of the chest piece is constructed by mapping the relative positions and contour relationships of the arm hole and the leg hole of the back piece, to ensure accurate matching of the chest piece and the back piece when they are sewn together, and to construct the chest piece lower crotch structure through angles and perpendicular bisector convexity control points controlled by the scale factors.

6. The two-dimensional cut-and-slit method according to claim 1, wherein: The plush toy is in the shape of a panda, and the contour structures of the head piece, the chest piece and the back piece are designed for high-fidelity restoration of the complex curved surface features of a panda.

7. The two-dimensional cut-and-slit method according to claim 1, wherein: The method is specifically applied to cutting and sewing of super-soft short plush fabric, the rough sample version has a uniform outward extension of a fixed value of seam head around the periphery, the seam head width is 0.5 cm, and 301 stitches are used in the sewing process with a stitch density of 15 stitches / 2.5 cm.

8. The two-dimensional cut-and-slit method according to claim 7, wherein: The reference centimeter is 12 cm, and by adjusting the value of the reference centimeter while keeping the scale factors unchanged, the size of the toy can be quickly scaled and developed in series.

9. The two-dimensional open version method according to any one of claims 1-8, characterized in that: The rough sample version of the panda plush toy generated by the method finally comprises: 2 back pieces, 2 chest pieces, 1 internal arm piece, 1 internal leg piece, 1 head piece, 4 ear pieces, 1 tail, and 2 foot bottom pieces. 10.A non-transitory computer-readable storage medium storing a computer program, wherein the computer program is configured to cause a processor to perform the method according to any one of claims 1 to 9. The program is executed by the processor to automatically complete the two-dimensional opening process of the complex curved surface panda plush toy by running the two-dimensional opening method as claimed in any one of claims 1-9.

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