Design support device, design method, and upper manufacturing system

Abstract

A design support device, design method, and shoe upper manufacturing system are disclosed, which design a cutting pattern for a sheet material, wherein the cutting pattern of the sheet material, when thermoformed, allows the shoe upper to follow the shape of a shoe last. The design support device (100) includes: an input unit (106) for receiving shoe last data (1); a processor (102) (computation unit) for calculating a cutting pattern (30) for the sheet material based on the shoe last data (1) received by the input unit (106); and an output unit (108) for outputting the cutting pattern (30) for the sheet material calculated by the processor (102). The processor (102) calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, and calculates the cutting pattern (30) for the sheet material by adding the calculated correction amount to the shape pattern (3) of the shoe upper, which unfolds the three-dimensional shape data (2) onto a plane, wherein the dimensions of the three-dimensional shape data (2) match those of the shoe last data (1).

Description

Technical Field

[0001] This disclosure relates to a design support device, a design method, and a shoe upper manufacturing system. Background Technology

[0002] In the manufacture of shoes, the fabric constituting the upper is covered over the last to form an upper that follows the shape of the last. For example, U.S. Patent Application Publication No. 2018 / 125165 discloses a method of thermoforming the fabric constituting the upper to form an upper that follows the shape of the last. Summary of the Invention

[0003] To conform to the shape of the shoe last, the upper needs to be three-dimensional. Therefore, multiple parts are cut from flat sheets such as fabric and then sewn or assembled using adhesives to create the three-dimensional upper. However, if the cutting pattern for the multiple parts is designed solely based on the shape of the shoe last, sometimes sections that do not fully conform to the shape of the last may occur when the upper is placed over the last and thermoformed.

[0004] The purpose of this disclosure is to provide a design support device, a design method, and a shoe upper manufacturing system, which designs a cutting pattern for a sheet material, wherein the cutting pattern of the sheet material, when thermoformed, allows the shoe upper to follow the shape of the shoe last.

[0005] The design support device according to one aspect of this disclosure is a device for designing a cutting pattern for a sheet material when cutting a heat-shrinkable sheet material to make a shoe upper. The design support device includes: an input unit for receiving shoe last data; a calculation unit for calculating a cutting pattern for the sheet material based on the shoe last data received by the input unit; and an output unit for outputting the cutting pattern for the sheet material calculated by the calculation unit. The calculation unit calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, and adds the calculated correction amount to the shape pattern of the shoe upper unfolded onto a plane, matching the dimensions of the shoe last data, to calculate the cutting pattern for the sheet material.

[0006] The design method according to one aspect of this disclosure is a method for designing a cutting pattern for a sheet material when cutting a sheet material with heat shrinkability to make a shoe upper. The design method includes: a step of receiving shoe last data; a step of calculating a cutting pattern for the sheet material based on the received shoe last data; and a step of outputting the calculated cutting pattern for the sheet material. The calculation step includes: a step of calculating a correction amount taking into account the shrinkage direction and shrinkage rate of the sheet material; and a step of adding the calculated correction amount to the shape pattern of the shoe upper unfolded onto a plane, matching the dimensions of the shoe last data, to calculate the cutting pattern for the sheet material.

[0007] According to one aspect of this disclosure, a shoe upper manufacturing system is a system for manufacturing shoe uppers by cutting a sheet material with heat shrinkability. The shoe upper manufacturing system includes: a design support device for designing a cutting pattern for the sheet material; and a cutting device for cutting the sheet material based on the cutting pattern designed by the design support device. The design support device includes: an input unit for receiving shoe last data; a calculation unit for calculating the cutting pattern for the sheet material based on the shoe last data received by the input unit; and an output unit for outputting the cutting pattern for the sheet material calculated by the calculation unit. The calculation unit calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, and adds the calculated correction amount to the shape pattern of the shoe upper unfolded onto a plane, matching the dimensions of the shoe last data, to calculate the cutting pattern for the sheet material.

[0008] The described and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the invention in relation to the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a schematic diagram illustrating a structural example of a shoe upper manufacturing system according to an embodiment.

[0010] Figure 2 This is a schematic diagram illustrating an example of the hardware structure of a design support device for implementing an embodiment.

[0011] Figure 3 This is a flowchart illustrating the process of processing the cutting pattern of the design sheet for the design support device used to explain the implementation method.

[0012] Figure 4 It is a schematic diagram used to illustrate the evolution from shoe last data to sheet cutting patterns.

[0013] Figure 5 (a) is a diagram showing the shrinkage direction during thermoforming in the three-dimensional shape of the shoe upper.

[0014] Figure 5 (b) is a schematic diagram showing an example considering the shrinkage direction of the sheet.

[0015] Figure 5 (c) is a schematic diagram showing an example considering the shrinkage rate of the sheet.

[0016] Figure 6 This is a plan view showing an example of the correction amount for the cutting pattern of a sheet material.

[0017] Figure 7 (a) is a side view of a shoe upper, showing an example of a correction amount that takes into account the thickness of the sheet material.

[0018] Figure 7 (b) is a plan view of a shoe upper that shows an example of a correction amount that takes into account the thickness of the sheet material.

[0019] Figure 8 (a) is a plan view showing the cutout pattern of the bottom face.

[0020] Figure 8 (b) is a cut pattern diagram that shows an example of a correction amount for the outer perimeter length of the bottom part of the shoe upper.

[0021] Figure 9 It is an example of a sheet material with heat shrinkage properties, and is a schematic diagram showing a state in which the first layer of fabric is sandwiched between the second and third layers as nonwoven fabric.

[0022] Figure 10 (a) is a three-dimensional diagram that schematically represents the structure of the yarn including the core and sheath materials.

[0023] Figure 10 (b) is a diagram showing the initial state of the fabric.

[0024] Figure 10 (c) is a diagram schematically representing the state of weft yarn shrinkage.

[0025] Figure 10 (d) is a diagram that schematically represents the state of the warp and weft yarns being fused together.

[0026] Figure 11 (a) is a diagram showing a general outline of the needle-punching process.

[0027] Figure 11 (b) is a plan view of a fiber sheet having a needle-punched processing section and a gap-forming section without needle punching.

[0028] Figure 12 This is another example of a heat-shrinkable sheet, and is a schematic diagram showing a state in which an assembly of multiple chip materials, including nonwoven fabric, is sandwiched with a nonwoven fabric as a base sheet for the fabric.

[0029] Figure 13 It is a diagram that roughly represents the needle-punching process.

[0030] Figure 14 This is another example of a sheet material with heat shrinkage properties, and it is a cross-sectional view showing the layer structure of the sheet material.

[0031] Figure 15 This is a plan view showing an example of a double Raschel billet.

[0032] Figure 16 This is a partially enlarged cross-sectional view of an example of a double Raschel billet. Detailed Implementation

[0033] The embodiments will now be described based on the accompanying drawings. In the following description, the same symbols will be used to refer to the same components. Their names and functions are also the same. Therefore, detailed descriptions of them will not be repeated.

[0034] (Implementation Method)

[0035] In this embodiment, an example of a scenario in which the present invention is applied will be described. First, in this embodiment, for example in a shop, when making custom shoes that match a user's foot, shoe last data is generated based on foot shape data measured by a measuring device. Furthermore, in this embodiment, a shoe upper manufacturing system will be described, which calculates a cutting pattern for the sheet material used to make the shoe upper based on the generated shoe last data, and cuts the sheet material using a cutting device based on the cutting pattern.

[0036] Figure 1 This is a schematic diagram illustrating a structural example of the shoe upper manufacturing system 10 according to an embodiment. (Refer to...) Figure 1 The shoe upper manufacturing system 10 includes: a design support device 100, a foot shape measuring device 200, and a cutting device 400 for cutting sheets based on a cutting pattern. Furthermore, in Figure 1 The shoe upper manufacturing system 10 shown includes a measuring device 200, but it may also be omitted from the system and utilize pre-stored shoe last data. Alternatively, depending on the store or its location (e.g., a user's home), a portable terminal 300 such as a smartphone can be used instead of the measuring device 200 to measure foot shape. Furthermore, the support device 100 is designed to communicate with a data server (not shown) located inside or outside the store.

[0037] The design support device 100 generates shoe last data based on foot shape data obtained from the measuring device 200 or the portable terminal 300, and then calculates the cutting pattern of the sheet material based on the shoe last data. Figure 2 This is a schematic diagram illustrating an example of the hardware structure of the design support device 100 for implementing an embodiment. (Refer to...) Figure 2 The design support device 100 includes: a processor 102, a main memory 104, an input unit 106, an output unit 108, a storage unit 110, an optical driver 112, and a communication controller 120. These components are connected via a processor bus 118.

[0038] Processor 102 includes a central processing unit (CPU) or a graphics processing unit (GPU), etc., and can read programs stored in memory 110 (for example, an operating system (OS) 1102 and a processing program 1104) and execute them in main memory 104. Various programs read from memory 110 are executed in processor 102. Specifically, processing program 1104 calculates shoe last data based on foot shape data and additional information received by input unit 106 using a prescribed algorithm. Processing program 1106 calculates the cutting pattern of the sheet material based on the shoe last data using a prescribed algorithm. Simulation program 1108 calculates the correction amount of the shape pattern in processing program 1106 by simulating the shrinkage direction and shrinkage rate of the sheet material. Processor 102 executing these programs corresponds to the arithmetic unit of design support device 100.

[0039] Main memory 104 includes volatile storage devices such as dynamic random access memory (DRAM) or static random access memory (SRAM). Storage device 110 includes, for example, non-volatile storage devices such as hard disk drive (HDD) or solid state drive (SSD).

[0040] In addition to storing OS 1102, which is used to implement basic functions, storage 1100 also stores processor 1104, processor 1106, and simulation program 1108, which are used to provide functions as a design support device 100.

[0041] The input unit 106 includes an input interface that connects to the measuring device 200 or the portable terminal 300 to receive foot shape data from the measuring device 200 or the portable terminal 300. Additionally, the input unit 106 includes a keyboard or mouse, a microphone, a touch device, etc., and can further receive information selected by the user.

[0042] The output unit 108 includes an output interface that outputs the cutting pattern of the sheet calculated by the processor 102 to the cutting device 400. Additionally, the output unit 108 includes a display, various indicators, a printer, etc., and outputs processing results from the processor 102.

[0043] The communication controller 120 exchanges data with other control devices using wired or wireless communication. The design support device 100 can also exchange foot data and additional information with the measuring device 200 or portable terminal 300 via the communication controller 120, or exchange cutting patterns with the cutting device 400 via the communication controller 120. Furthermore, a universal serial bus (USB) controller connected to the processor bus 118 can be provided separately from the communication controller 120 to exchange data with other control devices via USB connection.

[0044] The design support device 100 has an optical driver 112 and can also read programs stored therein from a recording medium 114 (e.g., an optical recording medium such as a Digital Versatile Disc, DVD) that non-temporarily stores computer-readable programs and install them in a storage device 110 or the like.

[0045] The processing program 1104 and the like executed by the design support device 100 can be installed via a computer-readable recording medium 114, or it can be installed by downloading from a server device on a network. Furthermore, the functions provided by the design support device 100 in some embodiments are sometimes implemented using a portion of a module provided by the OS.

[0046] exist Figure 2 The diagram illustrates a structural example where a processor 102 executes a program to provide the functionality required as a design support device 100. However, some or all of these provided functions can also be implemented using dedicated hardware circuitry (e.g., application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs)). Additionally, Figure 2 The structure of the design support device 100 shown is illustrative and is not limited to the structure described.

[0047] The measuring device 200 is a three-dimensional foot scanner based on laser measurement. The foot is placed on a top plate, and laser measuring devices built into the side walls, positioned across the foot, measure from the toe to the heel to obtain the user's three-dimensional foot shape data. Furthermore, the measuring device 200 is not particularly limited in its measurement method, as long as it can measure three-dimensional foot shape data. Alternatively, a portable terminal 300 such as a smartphone can be used to photograph the user's foot to obtain image data, and foot shape data can be generated based on the image data captured using pre-installed software.

[0048] Figure 3 This is a flowchart illustrating the process of processing the cutting pattern of the design sheet using the design support device in the implementation method. First, the design support device 100 receives foot shape data measured by the measuring device 200 or the portable terminal 300 (step S101). The design support device 100 calculates shoe last data based on the foot shape data (step S102). Figure 4 This is a schematic diagram illustrating the transition from shoe last data to sheet material cutting patterns. The design support device 100 calculates based on foot shape data. Figure 4 The shoe last data shown is 1.

[0049] Return to Figure 3 The design support device 100 determines whether it has accepted the shoe last data 1 (step S103). Furthermore, in the case of a custom-made shoe, the design support device 100 accepts the shoe last data 1 calculated based on the measured foot shape data, but it can also accept existing shoe last data. If the shoe last data 1 is not accepted (NO in step S103), it is considered that the calculation of the shoe last data 1 has not been completed, or that existing shoe last data has not been accepted, and the design support device 100 returns the processing to step S102.

[0050] Upon receiving the shoe last data 1 (YES in step S103), the design support device 100 calculates the three-dimensional (3D) shape data of the upper based on the shoe last data (step S104). Specifically, the design support device 100 determines the three-dimensional shape of the upper based on information about the model of the shoe to be manufactured, and calculates the three-dimensional shape data by adjusting the dimensions of the determined three-dimensional shape of the upper along the outer surface of the shoe last data 1. The result calculated based on the shoe last data 1 becomes... Figure 4 The three-dimensional shape data 2 of the shoe upper is shown. In addition, the design support device 100 can also generate the shape of the shoe opening of the shoe upper based on the user's selection information (e.g., not touching the foot, difficult to take off, etc.) and apply it to the three-dimensional shape data 2 of the shoe upper.

[0051] The design support device 100 unfolds the three-dimensional shape data 2 of the shoe upper onto a plane and calculates the shape pattern of the shoe upper (step S105). For example... Figure 4 As shown, the shape pattern of the shoe upper is a shape pattern 3 that is unfolded onto a plane using existing algorithms, based on the three-dimensional shape data 2 that matches the dimensions of the shoe last data 1. In the production of the shoe upper, multiple parts are cut from flat sheets such as fabric, and these parts are then assembled by sewing or using adhesives to create a three-dimensional shoe upper. Materials used for the shoe upper include, for example, knitted raw materials, mesh raw materials, artificial leather, non-woven fabrics, and heat-shrinkable raw materials.

[0052] Especially when using heat-shrinkable raw materials to make shoe uppers, multiple parts are cut from heat-shrinkable sheets and assembled by sewing or using adhesives to create a three-dimensional shoe upper. However, if the heat-shrinkable sheet is cut based solely on the shape pattern 3 of the shoe upper calculated from the shape of the shoe last data 1, sometimes parts that do not fully conform to the shape of the shoe last may occur when the three-dimensional shoe upper is covered over the shoe last and thermoformed.

[0053] Therefore, in the design support device 100 of this embodiment, a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet is calculated using the simulation program 1108. Furthermore, the design support device 100 calculates the shape pattern 3 of the upper, which is unfolded onto a plane to match the dimensions of the last data 1, by adding the calculated correction amount. Figure 4 The sheet material cutting pattern 30 is shown. Furthermore, in Figure 4 In addition to the cut pattern 30 on the upper part of the shoe upper, a cut pattern 40 on the bottom part that is continuous with the lower end of the main body is also shown.

[0054] As a method for calculating the correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, the design support device 100, for example, uses a simulation program 1108 to simulate the shrinkage direction and shrinkage rate of the sheet material cut to the shape pattern 3 of the upper during thermoforming to calculate the correction amount. The simulation program 1108 pre-inputs the shrinkage direction and shrinkage rate of the heat-shrinkable raw material and calculates the correction amount by considering the shrinkage direction at the position of the three-dimensional shape of the upper or the shrinkage rate of each area of ​​the upper. Of course, the design support device 100 can also determine the correction amount uniformly based on the shrinkage direction and shrinkage rate of the sheet material, regardless of the position of the three-dimensional shape of the upper. In addition, the design support device 100 can also receive verification data of the manufactured upper and last (e.g., dimensional errors of the manufactured upper and last) through the input unit 106 and adjust the conditions of the simulation program 1108 (conditions for calculating the correction amount) based on the verification data. Thus, the simulation program 1108 can calculate a correction amount with higher accuracy that allows the upper to follow the shape of the last.

[0055] Return to Figure 3 Specifically, the process by which the design support device 100 calculates the correction amount is explained. The design support device 100 calculates the correction amount by taking into account the shrinkage direction of the sheet material at the location of the three-dimensional shape of the shoe upper (step S106). Figure 5 (a) is a diagram showing the shrinkage direction during thermoforming in the three-dimensional shape of the shoe upper. According to... Figure 5As shown in (a), the portion of the shoe upper corresponding to the toe shrinks along the width direction of the shoe, which is shrinkage direction w1. The portion of the shoe upper corresponding to the arch of the foot shrinks along the width direction of the shoe, which is shrinkage direction w2. The portion of the shoe upper corresponding to the heel shrinks along the height direction of the shoe, which is shrinkage direction h. In order to make a shoe with a good fit that satisfies the user, it is especially necessary to calculate the accurate correction amount based on the shrinkage of the sheet material in shrinkage directions w1 and w2.

[0056] like Figure 5 As shown in (b), the design support device 100 positions the three-dimensional shape of the upper on the shape pattern 3 of the upper, and determines the shrinkage direction w1, shrinkage direction w2, shrinkage direction h, etc. The design support device 100 calculates an accurate correction amount for each shrinkage direction w1, shrinkage direction w2, shrinkage direction h determined on the shape pattern 3 of the upper, simulating the shrinkage amount of the sheet material.

[0057] Furthermore, the design support device 100 corrects the shrinkage rate of the sheet material for each area of ​​the shoe upper (step S107). Specifically, as... Figure 5 As shown in (b), the shape pattern 3 of the upper has a smaller shrinkage in the part corresponding to the heel compared to the part corresponding to the toe or arch of the foot due to the different areas of the sheet material cut according to the position. Therefore, as Figure 5 As shown in (c), for example, the shrinkage rate is set to 3% for the part of the upper corresponding to the toe or arch of the foot, and to 0% for the part of the upper corresponding to the heel. The design support device 100 uses, for example... Figure 5 As shown in (c), the shrinkage rate of the sheet material is set for each area of ​​the upper, and the correction amount calculated in step S106 is adjusted accordingly. Thus, the design support device 100 can calculate the optimal correction amount for the shape pattern 3 for each area of ​​the upper.

[0058] The design support device 100 determines whether the correction amount has been calculated at all positions of the shoe upper (step S108). When the correction amount has not been calculated at all positions of the shoe upper (no in step S108), the design support device 100 performs the processing of steps S106 and S107 at the positions of the shoe upper where the correction amount has not been calculated. When the correction amount has been calculated at all positions of the shoe upper (yes in step S108), the design support device 100 determines whether the user's adoption information for the completed cutting pattern 30 has been accepted (step S109). Specifically, when the correction amount has been calculated at all positions of the shoe upper, the design support device 100 adds the calculated correction amount to the shape pattern 3 of the shoe upper to calculate the cutting pattern 30 of the sheet material, and displays the cutting pattern 30 of the sheet material on the display, which is the output unit 108. Figure 6 This is a plan view illustrating an example of the correction amount for the cutting pattern of a sheet material. For example... Figure 6 As shown, the design support device 100 overlays the cutting pattern 30 (solid line) of the sheet material onto the shape pattern 3 (dashed line) of the shoe upper and displays it on the monitor so that the correction amount at each position of the shoe upper can be known. Thus, the user can easily determine which position of the shoe upper has been corrected excessively.

[0059] User confirmation Figure 6 The cutting pattern 30 of the sheet material is displayed. When adopted, adoption information is input from the input unit 106, such as a keyboard. If the user's adoption information is not accepted (no in step S109), the design support device 100 returns the processing to step S106 and recalculates the correction amount by changing the conditions, etc. On the other hand, if the user's adoption information is accepted (yes in step S109), the design support device 100 outputs the cutting pattern 30 of the sheet material to the cutting device 400 (step S110). When the cutting pattern 30 of the sheet material is accepted from the design support device 100, the cutting device 400 cuts the heat-shrinkable sheet material according to the cutting pattern 30.

[0060] Taking the shrinkage direction and shrinkage rate of the sheet material described in steps S106 and S107 as an example, the design support device 100 may also apply other processes or conditions to calculate the correction amount. For example, since the thickness of the sheet material varies depending on the material of the shoe upper, the design support device 100 may also calculate the correction amount taking into account the thickness of the sheet material. Figure 7 (a) is a side view of a shoe upper, showing an example of a correction amount that takes into account the thickness of the sheet material. Figure 7 (b) is a plan view of a shoe upper, showing an example of a correction amount that takes into account the thickness of the sheet material. For example... Figure 7 As shown in (a), the upper 20 is manufactured by sewing together a main body portion 20a located on the upper side of the upper 20 and a bottom portion 20b continuous with the lower end of the main body portion 20a. Therefore, a width d is required for the portion sewn between the main body portion 20a and the bottom portion 20b, and this width d varies depending on the thickness of the sheet material. To ensure the portion to be sewn (width d), the design support device 100 needs to correct the cutting pattern 30 of the sheet material, such as... Figure 7 As shown in (b), the cutting pattern 30a of the sheet material is calculated by adding a correction amount of width d as the part to be sewn around the outer periphery of the shape pattern 3 of the shoe upper.

[0061] Furthermore, for example, the upper 20, after sewing together the main body 20a and the sole 20b, is covered onto the shoe last and thermoformed. Therefore, the shrinkage direction and shrinkage rate of the sheet material of the main body 20a are constrained by the sewing with the sole 20b. That is, when the sewing between the main body 20a and the sole 20b is strong, the shrinkage direction and shrinkage rate of the sheet material of the main body 20a are strongly constrained by the shape (outer perimeter length) of the sole 20b. On the other hand, when the sewing between the main body 20a and the sole 20b is weak, the shrinkage direction and shrinkage rate of the sheet material of the main body 20a are less constrained by the shape (outer perimeter length) of the sole 20b.

[0062] Therefore, the design support device 100 can also calculate the correction amount based on the strength of the stitching between the main body 20a and the bottom part 20b, taking into account the strength of the constraint of the outer perimeter length of the main body 20a on the outer perimeter length of the bottom part 20b. Figure 8 (a) is a plan view showing the cutout pattern 40 of the bottom surface. Figure 8 (b) is a diagram showing an example of a cutting pattern that takes into account the correction amount for the outer perimeter length of the sole portion of the upper. The design support device 100 corrects the cutting pattern of the main body portion based on the strength of the constraint caused by the outer perimeter length of the cutting pattern 40 of the sole portion. Figure 8 In (b), the figure shows the cut pattern 30b (solid line) of the main body when the constraint caused by the outer perimeter length of the cut pattern 40 of the bottom surface is strong, and the cut pattern 30c (dashed line) of the main body when the constraint caused by the outer perimeter length of the cut pattern 40 of the bottom surface is weak.

[0063] (Heat-shrinkable raw materials)

[0064] The following is a detailed description of the structure of the heat-shrinkable sheet (heat-shrinkable raw material) for which the cutting pattern of the sheet needs to be calculated by taking into account the shrinkage direction and shrinkage rate of the sheet in the design support device 100.

[0065] Figure 9 This is an example of a sheet material with heat shrinkage properties, and is a schematic diagram showing a state in which the first layer of fabric is sandwiched between a second and third layer of nonwoven fabric. Figure 9 As shown, it includes a sheet-like first layer 31 and a sheet-like second layer 32 stacked on the first layer 31.

[0066] The first layer 31 includes a heat-shrinkable yarn 311. The first layer 31 includes a knitted fabric or a woven fabric with internal gaps 312. The knitting method of the knitted fabric is not particularly limited, for example, it can be Raschel knitting or tricot knitting. The weaving method of the woven fabric is also not particularly limited, for example, it can be plain weave or twill weave.

[0067] The second layer 32 comprises a nonwoven fabric. The nonwoven fabric may, for example, be made of polyester fibers. Due to fiber entanglement, the nonwoven fabric of the second layer 32 does not have the internal voids equivalent to the internal voids 312 of the first layer 31.

[0068] In the upper, the first layer 31 is located further inward than the second layer 32 (on the side closer to the wearer's foot when worn). That is, the first layer 31 is the inner layer, and the second layer 32 is the outer layer.

[0069] Here, the term "internal void" refers to the space between fibers, such as yarns, that constitute the knitted fabric or woven material, or between aggregates of fibers. Furthermore, in knitted fabrics or woven materials, when fibers are arranged to extend along a planar direction, it is a space that runs through the plane along the normal direction or is interrupted in the planar direction. Additionally, when adjacent fiber intersections are spaced apart, it is a space surrounded by multiple fiber intersections. Moreover, when using fused yarns as described later, the intersections of fibers fused by thermoforming the upper before molding become fixed, and the intersecting fibers (yarns) are fixed together. The "internal void" is, for example, equivalent to the mesh of a mesh (refer to...). Figure 9 The second layer shown as an overlap consists of internal gaps 312 formed by the weft yarns (yarns 311) and warp yarns (yarns 313) in the first layer 31 fabric, or the mesh portion of the fabric. In this embodiment, the distance between the intersections of adjacent fibers is set to 1 mm to 5 mm. Alternatively, the space ratio in the planar direction occupied in the knitted fabric is set to 15% to 30%. Either of these two conditions can be set to be satisfied.

[0070] The first layer 31 has an internal void 312, the space of which allows for the deformation (shrinkage) of the heat-shrinkable yarn 311, and the accompanying interlaced yarns 313 (see reference). Figure 10 The movement of (b) is thus facilitated. Therefore, the space of the internal void 312 does not impede the deformation of the first layer 31 caused by the heat-shrinkable yarn 311. Thus, the first layer 31 can be deformed according to the design, making it easy to set the conditions for heat shrinkage (heating temperature and heating time, etc.).

[0071] Figure 10(a) is a three-dimensional diagram that schematically represents the structure of the yarn including the core and sheath materials. Figure 10 (b) is a diagram showing the initial state of the fabric. Figure 10 (c) is a diagram schematically representing the state of weft yarn shrinkage. Figure 10 (d) is a schematic diagram illustrating the state of the warp and weft yarns being welded together. For example... Figure 10 As shown in (a), the heat-shrinkable yarn 311 included in the first layer 31 can be configured as a core-sheath material integrally formed of a core 3111 (inner peripheral portion) and a sheath 3112 (outer peripheral portion). The yarn 311 is a fused yarn that is melted by heat, and the core 3111 and sheath 3112 have different melting points. Regarding the melting point of the yarn 311, the sheath 3112 has a lower melting point than the core 3111. Therefore, by heating the upper before forming during the forming process, the yarn 311 shrinks as a whole, while only a portion of the sheath 3112 melts. Thus, both the shape-preserving effect produced by the sheath 3112 and the elastic effect produced by the core 3111 can be achieved. As the heat-shrinkable yarn 311, for example, a yarn comprising polyester resin can be used, more specifically, a sheath core material comprising a polyester thermoplastic elastomer, and a sheath core material in which the core 3111 comprises a polyester thermoplastic elastomer and the sheath 3112 comprises a polyamide thermoplastic elastomer.

[0072] Additionally, the first layer 31 may include a fabric in which one of the warp or weft yarns is a heat-shrinkable yarn 311, or a knitted fabric in which more than 10% of the yarns are heat-shrinkable yarns 311. In the case of a fabric, the heat-shrinkable yarns 311 (warp or weft) are arranged along the width direction of the shoe upper. Furthermore, the heat-shrinkable yarns 311 are generally used as weft yarns. Therefore, the fabric structure of the first layer 31 when the heat-shrinkable yarns 311 are used as weft yarns is shown below. Figure 10 (b). According to the structure, by heating the first layer 31, as... Figure 10 As shown in (c), yarn 311 shrinks along its length (the shrinkage in the direction indicated by the arrow results in a smaller change in the spacing between adjacent warp yarns (yarn 313, yarn 313)). Then, the sheath 3112 of yarn 311, including the core sheath material, melts and is fixed to yarn 313 (in... Figure 10 (d) indicates the attachment portion 314 (circled in black). The first layer 31 is deformed as described above. By utilizing this deformation, the upper is shaped to the desired form, thus enabling appropriate shaping along the shape of the last.

[0073] Next, Figure 11 (a) is a diagram showing a general outline of the needle-punching process. Figure 11(b) is a plan view showing a fiber sheet with a needle-punched processing section and an un-needle-punched gap-forming section. The first layer 31 and the second layer 32 are, as... Figure 11 As shown in (a), a fiber sheet 3S is formed by repeatedly moving a needle device with multiple needles N along the direction M shown in the figure, with the first layer 31 and the second layer 32 forming a double-layer structure overlapping, and performing a needle punching process on the overlapping first layer 31 and the second layer 32 to integrate the multiple needles. By integrating the first layer 31 and the second layer 32, which are different layers as described above, to form the fiber sheet 3S, the design freedom of the fiber sheet 3S is increased according to the combination of colors of the first layer 31 and the second layer 32, or the selection of the position of the needle punching process. The fiber sheet 3S is formed in a sheet shape or a bag shape, for example, before being sewn into the shape of a shoe upper.

[0074] like Figure 11 As shown in (b), the fiber sheet 3S may include a processed section 3S1 that has undergone needle punching and a gap-forming section 3S2 (shown by the double-dotted line) that has not undergone needle punching. In the gap-forming section 3S2, since the first layer 31 and the second layer 32 are not integrated, a gap (space) can be formed between the first layer 31 and the second layer 32. A cushioning material (yarn, cotton, foam) or a reinforcing material can be inserted into the gap (space) of the gap-forming section 3S2. The cushioning material can be inserted, for example, at the shoe opening or shoe tongue. The reinforcing material can be inserted, for example, at the eyelets, toe area, or heel area. Thus, the gap-forming section 3S2 can be given desired characteristics. However, it is also possible not to insert anything into the gap-forming section 3S2. Depending on the characteristics of the inserts into the gap-forming section 3S2, the fiber sheet 3S can have different characteristics. Furthermore, the amount of heat shrinkage of the fiber sheet 3S when heated can also be adjusted using the inserts.

[0075] like Figure 9 As shown, the fiber sheet 3S can also be configured as a three-layer structure, including a third layer 33 containing nonwoven fabric on the inner side of the first layer 31. In this case, the first layer 31 is also needle-punched to form a single unit consisting of the first layer 31, the second layer 32, and the third layer 33. By including the third layer 33 as described above, and by setting the material and thickness of the third layer 33, the desired characteristics can be imparted to the manufactured shoe. The third layer 33 can be provided entirely or partially relative to the first layer 31. In the case of partial provision, for example, the third layer 33 can be used to reinforce the periphery of the shoe opening where the wearer's foot enters and exits, or to reinforce the portion forming the eyelets.

[0076] Figure 12This is another example of a heat-shrinkable sheet, and is a schematic diagram showing a state in which an assembly of multiple nonwoven chip materials, including nonwoven fabric, is sandwiched with a nonwoven fabric as a base sheet for the fabric. Figure 12 As shown, it includes a sheet-like substrate 31a and multiple sheet-like chip materials 32a...32a stacked on the substrate 31a.

[0077] Substrate sheet 31a and Figure 9 The first layer 31 shown is identical, containing heat-shrinkable yarns 311. The base sheet 31a comprises a woven fabric (knitted fabric) or a woven material (woven fabric) with internal voids 312. The weaving method of the woven fabric is not particularly limited, for example, it can be Raschel weave or Trico weave. The weaving method of the woven fabric is also not particularly limited, for example, it can be plain weave or twill weave.

[0078] Next, Figure 13 This is a schematic diagram illustrating the needle punching process. The substrate sheet 31a and multiple chip sheets 32a…32a, as shown... Figure 13 As shown, a fiber sheet 3Sa is formed by overlapping two layers: a base sheet 31a and a layer composed of multiple chip materials 32a...32a. A needle device with multiple needles N is moved reciprocally in the direction M shown in the figure to perform a needle-punching process on the overlapping two layers, causing the multiple needles to repeatedly penetrate, thus integrating them into a single fiber sheet 3Sa. The combination of materials for the base sheet 31a and the multiple chip materials 32a...32a constituting the fiber sheet 3Sa can be any of the following: woven fabric and nonwoven fabric, woven fabric and nonwoven fabric, woven fabric and woven fabric, or woven fabric and woven fabric. By using multiple chip materials 32a...32a and changing the chip materials 32a bonded at each part of the base sheet 31a, different characteristics (e.g., mechanical properties or appearance features such as contour shape, color, pattern, texture, etc.) can be imparted to each part of the upper. The fiber sheet 3Sa is formed by integrating a base sheet 31a and a layer consisting of multiple chip materials 32a...32a, thereby increasing the bonding strength between the base sheet and the multiple chip materials 32a...32a. Furthermore, the design freedom of the fiber sheet 3Sa is increased by considering factors such as the color combination of the base sheet 31a and the multiple chip materials 32a...32a, or the selection of the location for needle punching. The fiber sheet 3Sa is formed, for example, in a sheet (flat) or bag shape, before being sewn to the shape of the shoe upper.

[0079] like Figure 13As shown, multiple chip materials 32a…32a are bonded to the base sheet 31a in a partially overlapping state. Therefore, multiple chip materials 32a…32a are exposed on the surface of the fiber sheet 3Sa, while the base sheet 31a itself (as a sheet) is not exposed. Furthermore, the partially overlapping chip materials 32a…32a located on the outermost layer improves the aesthetics of the shoe upper. Additionally, because the multiple chip materials 32a…32a overlap each other, the bonding of the chip materials relative to the base sheet 31a is stable through mutual support of the overlapping chip materials 32a…32a.

[0080] like Figure 12 As shown, the fiber sheet 3Sa can also be configured as a three-layer structure, including an additional sheet-like layer 33a containing nonwoven fabric inside the base sheet 31a. In this case, the base sheet 31a is also needle-punched to integrate the base sheet 31a, multiple chip materials 32a…32a, and the additional layer 33a. The additional layer 33a is not limited to nonwoven fabric; it can also be woven fabric, woven material, etc. Furthermore, the additional layer 33a can also include multiple chip materials 32a…32a. In this case, the additional layer 33a can be formed by combining chip materials 32a of any type (nonwoven fabric, woven fabric, woven material, or woven fabric) with chip materials 32a of a different material. By including the additional layer 33a as described above, the foot contact for the shoe wearer can be improved. Furthermore, by setting the material and thickness of the additional layer 33a, the manufactured shoe can be given desired characteristics. The additional layer 33a can be provided entirely or partially relative to the base sheet 31a. In the case of partial provision, for example, the additional layer 33a can be used to reinforce the periphery of the shoe opening through which the wearer's foot enters or exits, or as reinforcement of the portion forming the eyelets.

[0081] Next, Figure 14 This is another example of a sheet material with heat shrinkage properties, and it is a cross-sectional view showing the layered structure of the sheet. For example... Figure 14 As shown, it includes a sheet-like first layer 31b and a sheet-like second layer 32b laminated on top of the first layer 31b. Furthermore, the layer including the first layer 31b and the layer including the second layer 32b are integrally formed to create a fiber sheet 3Sb. Additionally, as... Figure 14As shown by the double-dotted line, the upper can also be configured as a three-layer structure with a third layer 33b further inner than the second layer 32b. The third layer 33b can be made of knitted fabric like the first layer 31b and the second layer 32b, or it can be made of woven fabric. If it is woven fabric, the weaving method is not particularly limited; for example, it can be plain weave or twill weave. The third layer 33b preferably has high elasticity, with a greater stretch rate than the first layer 31b and the second layer 32b. For example, high elasticity can be achieved by using spandex fibers, crimped yarns, plain weave fabrics, neoprene rubber raw materials, etc., to create the blank.

[0082] The first layer, 31b, is a double Raschel billet. Figure 15 This is a plan view showing an example of a double Raschel billet. Figure 16 This is a partially enlarged cross-sectional view of an example of a double Raschel billet. (See attached image.) Figure 15 and Figure 16 As shown, the first layer 31b includes a knitted fabric 3k, which has a defined gap 3k1 opening on its surface (the outer surface in the upper state) and is formed by knitting yarn. The gap 3k1 refers to the portion of the knitted fabric 3k that constitutes a web. Figure 10 (a)~ Figure 10 (d) shows the space between the fiber assemblies of yarns 311, 313, etc. Additionally, it is a space extending along the normal direction of the knitted fabric's plane, or a space with a bottomed recess that opens along said normal direction. In the gaps 3k1, the openings of the mesh on the surface of the knitted fabric 3k sometimes appear as windows. The shapes of these openings are, for example, circular, oblong, elliptical, and squares or rhombuses with rounded corners (see reference). Figure 15 ).

[0083] On the other hand, the second layer 32b may also include a knitted fabric without gaps, but preferably includes a knitted fabric 3k with gaps 3k1, similar to the first layer 31b. The knitting method is not particularly limited; for example, it can be Raschel knitting or Trico knitting. In this embodiment, the knitted fabric is knitted using double Raschel knitting. The shape of the knitted fabric 3k viewed from above in a flat state is as follows: Figure 15 The shape shown. Additionally, the cross-sectional shape is roughly as follows: Figure 16The shape shown is such that the gap 3k1 extends along the thickness direction. By including at least the first layer 31b with a knitted fabric 3k having the gap 3k1, breathability and softness can be imparted to the upper in accordance with the space present. Furthermore, since the gap 3k1 serves as a shrinkage allowance during the forming of the upper using heat, shrinkage allowance is ensured before forming. Thus, by including the first layer 31b with a heat-shrinkable yarn 311, the first layer 31b, containing yarns 311 and 313, is easily deformed during the forming of the upper using heat, and therefore easily conforms to the shape of the shoe last.

[0084] As described above, the design support device 100 of this embodiment is an apparatus for designing a cutting pattern for a sheet material when cutting a heat-shrinkable sheet material to make a shoe upper. The design support device 100 includes: an input unit 106 that receives shoe last data 1; a processor 102 (calculation unit) that calculates a cutting pattern 30 for the sheet material based on the shoe last data 1 received by the input unit 106; and an output unit 108 that outputs the cutting pattern 30 for the sheet material calculated by the processor 102. The processor 102 calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, and adds the calculated correction amount to the shape pattern 3 of the shoe upper, which is unfolded onto a plane from the three-dimensional shape data 2, to calculate the cutting pattern 30 for the sheet material. The dimensions of the three-dimensional shape data 2 match those of the shoe last data 1.

[0085] Therefore, the design support device 100 of the embodiment calculates the cutting pattern 30 of the sheet material by taking into account the shrinkage direction and shrinkage rate of the sheet material, so that the cutting pattern 30 of the sheet material can be designed so that the upper can follow the shape of the shoe last when thermoforming is performed.

[0086] The processor 102 preferably calculates the correction amount for each position of the shoe upper. Thus, compared to the correction amount determined uniformly based on the shrinkage direction and shrinkage rate of the sheet, the design support device 100 is able to design a cutting pattern 30 of the sheet that can more closely follow the shape of the shoe last.

[0087] The processor 102 preferably calculates a correction amount for the shrinkage direction of the sheet at a location that takes into account the three-dimensional shape of the shoe upper. Thus, the design support device 100 can perform corrections that more closely match the shape of the shoe.

[0088] The processor 102 preferably calculates a correction amount that takes into account the shrinkage rate of the sheet material pre-set for each area of ​​the upper. Thus, the design support device 100 can set an optimal shrinkage rate for each area of ​​the upper, and the design can more closely follow the shape of the last to create the cutting pattern 30 of the sheet material.

[0089] The processor 102 preferably calculates a correction amount that takes into account the thickness of the sheet. Thus, the design support device 100 can design the cutting pattern 30 of the sheet taking into account the bottom surface 20b and the parts required for sewing.

[0090] The upper includes a main body portion 20a located on the upper side and a bottom portion portion 20b continuous with the lower end of the main body portion 20a. The processor 102 preferably calculates a correction amount that takes into account the outer perimeter length of the bottom portion portion 20b. Thus, the design support device 100 can design the cutting pattern 30 of the sheet material taking into account the bottom portion portion 20b and the strength of the stitching during sewing.

[0091] Preferably, the input unit 106 also receives verification data of the manufactured upper and last, and the processor 102 adjusts the conditions for calculating the correction amount based on the verification data. Therefore, the design support device 100 can calculate the correction amount that allows the upper to follow the shape of the last with higher accuracy.

[0092] The sheet material is preferably a fiber sheet comprising heat-shrinkable yarns, a first layer comprising a woven or fabric having internal voids, and a second layer laminated on the first layer comprising a nonwoven fabric, wherein the first and second layers are integrally formed by needle punching.

[0093] The sheet is preferably a fiber sheet, which is formed by overlapping and bonding a base sheet containing heat-shrinkable yarns with a plurality of chip materials in a monomer that have an area smaller than that of the base sheet.

[0094] The sheet material is preferably composed of a first layer including a knitted fabric and a second layer disposed further inside the first layer and also including a knitted fabric. At least either the first layer or the second layer includes a first yarn and a second yarn as yarns constituting the knitted fabric. The first yarn has heat shrinkage properties, and the melting point of the second yarn is higher than that of the first yarn. The heat shrinkage rate of the layer containing the first yarn and the second yarn in the first layer or the second layer is higher in the width direction than in the front-back direction of the shoe upper.

[0095] Furthermore, the design method of this embodiment is a method for designing a cutting pattern for a sheet material when cutting a heat-shrinkable sheet to make a shoe upper. The design method includes: a step of receiving shoe last data 1; a step of calculating a cutting pattern 30 for the sheet material based on the received shoe last data 1; and a step of outputting the calculated cutting pattern 30 for the sheet material. The calculation step includes: a step of calculating a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material; and a step of adding the calculated correction amount to the shape pattern 3 of the shoe upper, which is unfolded onto a plane by the three-dimensional shape data 2, to calculate the cutting pattern 30 for the sheet material, wherein the dimensions of the three-dimensional shape data 2 match those of the shoe last data 1.

[0096] Therefore, by using the design method of the implementation method and taking into account the shrinkage direction and shrinkage rate of the sheet to calculate the sheet cutting pattern 30, it is possible to design a sheet cutting pattern 30 that allows the upper to follow the shape of the shoe last when thermoforming is performed.

[0097] Furthermore, the shoe upper manufacturing system 10 of the embodiment is a system for manufacturing shoe uppers by cutting a sheet material with heat shrinkability. The shoe upper manufacturing system 10 includes: a design support device 100 for designing a cutting pattern for the sheet material; and a cutting device 400 for cutting the sheet material based on the cutting pattern designed by the design support device 100. The design support device 100 includes: an input unit 106 for receiving shoe last data 1; a processor 102 for calculating the cutting pattern for the sheet material based on the shoe last data 1 received by the input unit 106; and an output unit 108 for outputting the cutting pattern for the sheet material calculated by the processor 102. The processor 102 calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet material, and calculates the cutting pattern 30 of the sheet material by adding the calculated correction amount to the shape pattern 3 of the shoe upper, which is unfolded onto a plane from the three-dimensional shape data 2, wherein the dimensions of the three-dimensional shape data 2 match those of the shoe last data 1.

[0098] Therefore, the shoe upper manufacturing system 10 of the embodiment calculates the cutting pattern 30 of the sheet material by taking into account the shrinkage direction and shrinkage rate of the sheet material, so that shoe uppers that can be made to follow the shape of the shoe last by thermoforming can be manufactured.

[0099] <Other variations>

[0100] exist Figure 1 The present invention describes a shoe upper manufacturing system 10 for a store, including a design support device 100, a measuring device 200, and a cutting device 400. However, depending on the store, the shoe upper manufacturing system 10 may also include stores that do not have a measuring device 200 but use a portable terminal 300 such as a smartphone to measure foot shape. Additionally, the shoe upper manufacturing system 10 may also include stores that do not have a cutting device 400 but use the cutting device 400 of other stores to cut sheet material to manufacture shoe uppers. The shoe last manufacturing systems of various stores can be connected to a data center for design support of the sheet material cutting pattern 30.

[0101] Embodiments of the present invention have been described, but should be considered as illustrative rather than restrictive in all respects. The scope of the invention is defined by the claims, which are intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A design support device for designing a cutting pattern for a heat-shrinkable sheet material when making a shoe upper, characterized in that, The design support device includes: The input department handles shoe last data; The calculation unit calculates the cutting pattern of the sheet material based on the shoe last data received by the input unit; and The output unit outputs the cutting pattern of the sheet material calculated by the calculation unit. The calculation unit calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet. The calculation unit calculates the cutting pattern of the sheet material by adding the calculated correction amount to the shape pattern of the shoe upper, which is unfolded onto a plane from the three-dimensional shape data. The dimensions of the three-dimensional shape data are matched with those of the shoe last data. The upper includes a main body portion located on the upper side and a bottom portion continuous with the lower end of the main body portion. The calculation unit takes into account the thickness of the sheet material and adds the width of the portion to be sewn between the main body and the bottom surface as the correction amount to calculate the cutting pattern of the sheet material.

2. The design support device according to claim 1, characterized in that, The calculation unit calculates the correction amount for each position of the shoe upper.

3. The design support device according to claim 2, characterized in that, The calculation unit calculates the correction amount for the shrinkage direction of the sheet at a position that takes into account the three-dimensional shape of the shoe upper.

4. The design support device according to claim 2 or 3, characterized in that, The calculation unit calculates the correction amount that takes into account the shrinkage rate of the sheet material preset for each area of ​​the upper.

5. The design support device according to claim 2 or 3, characterized in that, The calculation unit calculates the correction amount that takes into account the outer perimeter length of the bottom surface.

6. The design support device according to any one of claims 1 to 3, characterized in that, The input unit also accepts the verification data of the produced shoe upper and shoe last. The calculation unit adjusts the conditions for calculating the correction amount based on the verification data.

7. The design support device according to any one of claims 1 to 3, characterized in that, The sheet material includes: The first layer comprises heat-shrinkable yarns and includes a woven fabric or knit with internal gaps; and the second layer, layered on top of the first layer, comprises a nonwoven fabric. Furthermore, the sheet is a fiber sheet in which the first layer and the second layer are integrated through needle punching.

8. The design support device according to any one of claims 1 to 3, characterized in that, The sheet is a fiber sheet. The fiber sheet is formed by overlapping and bonding a base sheet containing heat-shrinkable yarns with a plurality of chip materials that have a smaller area in a monomer than the base sheet.

9. The design support device according to any one of claims 1 to 3, characterized in that, The sheet material includes: The first layer comprises a knitted fabric; and the second layer, disposed further inside the first layer, also comprises the knitted fabric. At least either the first layer or the second layer comprises a first yarn and a second yarn as yarns constituting the knitted fabric. The first yarn has heat shrinkage properties. The melting point of the second yarn is higher than that of the first yarn. The heat shrinkage rate of the layer containing the first yarn and the second yarn in the first or second layer is higher in the width direction than in the front-back direction of the shoe upper.

10. A design method of designing a cutting pattern of a sheet material in cutting the sheet material having a heat shrinkability to manufacture an upper, characterized by, The shoe upper includes a main body portion located on the upper side and a bottom portion continuous with the lower end of the main body portion. The design method includes: Steps for accepting shoe last data; The steps of calculating the cutting pattern of the sheet material based on the received shoe last data; and The steps for outputting the calculated cutting pattern of the sheet material. The step of calculating the cutting pattern of the sheet includes: The steps for calculating the correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet; and The step of calculating the cutting pattern of the sheet material by adding the calculated correction amount to the shape pattern of the shoe upper, which is obtained by unfolding the three-dimensional shape data onto a plane, involves matching the dimensions of the three-dimensional shape data with those of the shoe last data. The cutting pattern of the sheet is calculated by adding the width of the part to be sewn between the main body and the bottom part as the correction amount based on the thickness of the sheet.

11. A shoe upper manufacturing system, comprising cutting heat-shrinkable sheet material to manufacture shoe uppers, characterized in that, The shoe upper manufacturing system includes: Design support device, design the cutting pattern of the sheet; and A cutting device cuts the sheet material based on a cutting pattern designed by the design support device. The design support device includes: The input department handles shoe last data; The calculation unit calculates the cutting pattern of the sheet material based on the shoe last data received by the input unit; and The output unit outputs the cutting pattern of the sheet material calculated by the calculation unit. The calculation unit calculates a correction amount that takes into account the shrinkage direction and shrinkage rate of the sheet. The calculation unit calculates the cutting pattern of the sheet material by adding the calculated correction amount to the shape pattern of the shoe upper, which is unfolded onto a plane from the three-dimensional shape data. The dimensions of the three-dimensional shape data are matched with those of the shoe last data. The upper includes a main body portion located on the upper side and a bottom portion continuous with the lower end of the main body portion. The calculation unit takes into account the thickness of the sheet material and adds the width of the portion to be sewn between the main body and the bottom surface as the correction amount to calculate the cutting pattern of the sheet material.

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