Shoe last, method for manufacturing shoe last, and method for manufacturing shoe upper

Abstract

The present invention provides a shoe last that is suitable for a user's foot with a simple structure, a method for manufacturing the shoe last, and a method for manufacturing a shoe upper. The shoe last (1) used to form a shoe upper comprises: a common part (70) whose shape and position remain unchanged; a position changing part (80) whose shape remains unchanged and whose position relative to the common part (70) can be changed; and a position adjusting mechanism (82) that changes the position of the position changing part (80) relative to the common part (70) and fixes the position changing part (80) at a specific position.

Description

Technical Field

[0001] The present disclosure relates to a shoe last, a method for manufacturing a shoe last, and a method for manufacturing a shoe upper. Background Art

[0002] When manufacturing shoes, a shoe last (shoe mold) is used to cover the fabric constituting the shoe upper in order to form the shoe upper into a specific shape.

[0003] U.S. Patent Application Publication No. 2018 / 0014609 discloses manufacturing footwear within a portable housing. U.S. Patent Application Publication No. 2016 / 0206049 discloses a shoe last preform that can be reshaped using a shape-memory polymer. Chinese Patent No. 109732913 discloses forming a shoe last through three-dimensional (3D) printing. Summary of the Invention

[0004] When making custom shoes according to the foot of the user, a special shoe last reflecting the shape of each person's foot is manufactured. When utilizing the previous method to manufacture the user's special shoe last, a special large-scale machine is used, which is time-consuming and costly.

[0005] The present disclosure provides a shoe last that fits a user's foot with a simple structure, a method for manufacturing the shoe last, and a method for manufacturing a shoe upper using the shoe last.

[0006] According to one aspect of the present disclosure, a shoe last for forming a shoe upper is provided. The shoe last comprises: a common portion whose shape and position remain unchanged; a position-adjustable portion whose shape remains unchanged but whose position relative to the common portion can be adjusted; and a position adjustment mechanism for adjusting the position of the position-adjustable portion relative to the common portion and fixing the position-adjustable portion in a specific position.

[0007] According to one aspect of the present disclosure, a method for manufacturing a shoe last for forming a shoe upper is provided. The method for manufacturing the shoe last includes the following steps. The first step is to prepare a shoe last, which includes: a common portion whose shape and position remain unchanged; a position-changing portion whose shape remains unchanged and whose position relative to the common portion can be changed; and a position-adjusting mechanism that changes the position of the position-changing portion relative to the common portion and fixes the position-changing portion at a specific position. The second step is to adjust the position-adjusting mechanism to change the position of the position-changing portion relative to the common portion.

[0008] According to one aspect of the present disclosure, a method for manufacturing a shoe upper is provided. The method includes the following steps: A first step involves covering a pre-molded shoe upper comprising a fiber sheet containing heat-shrinkable yarn on a shoe last. A second step involves heating the pre-molded shoe upper to conform to the shape of the shoe last and convert it into a post-molded shoe upper.

[0009] The above and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when read with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This figure shows how the user's feet are photographed in order to obtain a foot model.

[0011] Figure 2 It is a three-dimensional image of the foot model.

[0012] Figure 3 It is a three-dimensional image of the shoe last model.

[0013] Figure 4 It is a three-dimensional image of the shoe last.

[0014] Figure 5 This is a perspective view of a shoe last in which the position of the position changing portion is changed along the width direction.

[0015] Figure 6 This is a plan view of a shoe last with the position of the position changing portion changed along the width direction.

[0016] Figure 7 It is a plan view showing a state in which the assembled shoe last portion is arranged in the gap between the position changing portion and the common portion.

[0017] Figure 8 This is a side view of a shoe last in which the position of the position changing portion is changed in the height direction.

[0018] Figure 9 This is a side view of a shoe last in which the angle of the position-changing portion relative to the common portion is changed.

[0019] Figure 10 It is a plan view of the shoe last covered by the cover.

[0020] Figure 11 It is a plan view of a shoe last including an assembly last portion extending in the width direction.

[0021] Figure 12 It is a perspective view of a shoe last according to a second embodiment.

[0022] Figure 13 It is a perspective view of a shoe last according to a third embodiment.

[0023] Figure 14 It is a perspective view of a shoe last according to a fourth embodiment.

[0024] Figure 15 It is a perspective view of an assembled shoe last according to a fourth embodiment.

[0025] Figure 16It is an exploded perspective view of an assembled shoe last portion according to a fourth embodiment.

[0026] Figure 17 It is a perspective view of the common portion of the fourth embodiment.

[0027] Figure 18 It is a side view of the shoe last according to the fifth embodiment.

[0028] Figure 19 It is a plan view schematically showing the change in position of the heel position changing portion.

[0029] Figure 20 This is a side view of the shoe last with the position of the heel position changing portion changed.

[0030] Figure 21 This is a perspective view showing a state where the shoe upper before molding is placed on the shoe last.

[0031] Figure 22 Schematic diagram showing a process of heating a pre-molding upper covered on a shoe last. DETAILED DESCRIPTION

[0032] The following describes the embodiment based on the accompanying drawings. In the following description, the same components are marked with the same symbols. The names and functions of these components are also the same. Therefore, the detailed description of these components will not be repeated.

[0033] The shoe last (shoe mold) of the embodiment described below is mainly a shoe last for custom-made shoes that fit the user's foot. However, the shoe last of the embodiment can also be applied to a shoe last for mass-produced shoes.

[0034] [First embodiment]

[0035] Figure 1 : is a diagram showing a situation where the user's foot F is photographed in order to obtain a foot model FM. Figure 1 As shown, a user's foot F is photographed using a portable device capable of taking photos, such as a smartphone P or a digital camera, to obtain image data of the foot F. The foot F image data can be captured at a store visited by the user. The store can be a fixed store or a mobile store using a car or trailer. Alternatively, the foot F image data can be captured at the user's home. The image data obtained by the user's own foot F can be transmitted to the shoe manufacturer's server.

[0036] Figure 2 This is a three-dimensional image of the foot model FM. Figure 2The foot model FM shown is a three-dimensional foot model generated based on measurement data of various parts of the user's foot F obtained from image data of the foot F. For example, when the user's foot F is photographed using a smartphone P, the foot model FM can be generated based on the image data using software pre-installed on the smartphone P. Alternatively, the foot model FM can be generated by performing calculations using the captured image data and data stored on a server used by the shoe manufacturer.

[0037] The foot model FM may be formed in the same shape as the user's foot F. Alternatively, a specific portion of the foot model FM may be modified to a desired size relative to the shape of the user's foot F for design or functional reasons.

[0038] Figure 3 It is a perspective view of the shoe last model 100 . Figure 3 The shoe last model 100 shown is based on Figure 2 The foot model FM shown is manufactured as a shoe last model that is customized according to the shape of the user's foot F. By using the shoe last manufactured according to the shoe last model 100 to shape the shoe upper, a customized shoe dedicated to the user can be manufactured.

[0039] Figure 4 1 is a three-dimensional diagram of the shoe last 1. Figure 4 As shown, the shoe last 1 defines a forefoot portion and a midfoot portion. For example, the area along the length of the shoe from the wearer's toes to the metatarsophalangeal (MTP) joint can be defined as the forefoot portion, while the area from the wearer's MTP joint to the cuneiform bone can be defined as the midfoot portion. Alternatively, for example, if the toe-side front end of the shoe last 1 is defined as the 0% position and the heel-side rear end is defined as the 100% position, the area along the length of the shoe last 1 from the 0% position to the 30%-35% position is defined as the forefoot portion, and the area behind the forefoot from the 50%-55% position is defined as the midfoot portion.

[0040] Figure 4 The shoe last 1 shown includes a common portion 70 of constant shape and position in the toe area and the midfoot to heel area corresponding to the ankle to arch area. Furthermore, the shoe last 1 includes a position-adjustable portion 80 of constant shape. The shoe last 1 includes a position-adjustable portion 80A in the midfoot area corresponding to the tips of the first and fifth toes, and a position-adjustable portion 80B in the midfoot area on the back of the midfoot. Position-adjustable portion 80A is adjustable in width. Position-adjustable portion 80B is adjustable in height and can change its angle relative to the common portion 70.

[0041] Figure 5It is a perspective view of the shoe last 1 in which the position of the position changing portion 80A is changed in the width direction. Figure 6 1 is a plan view of the shoe last 1 with the position of the position changing portion 80A changed along the width direction. Figure 5 、 Figure 6 As shown, the shoe last 1 includes a position adjustment mechanism 82. A pair of left and right position-changing portions 80A are connected by the position adjustment mechanism 82A. The position adjustment mechanism 82A adjusts the position of the position-changing portions 80A relative to the common portion 70. Furthermore, the position adjustment mechanism 82A can fix the position-changing portions 80A at a specific position after the position change.

[0042] The position adjustment mechanism 82A includes a snap-fitting portion 84. The snap-fitting portion 84 switches between a first state in which the position change portion 80A is fixed at a specific position and a second state in which the position change portion 80A is movable, using a fitting structure, a screw-locking structure, or the like. For example, the position adjustment mechanism 82A includes a large-diameter tube and a small-diameter tube housed within the large-diameter tube and capable of reciprocating relative to the large-diameter tube. The snap-fitting portion 84 can also switch between a state in which the small-diameter tube is not engaged with at least one of the large-diameter tube and the small-diameter tube, allowing the small-diameter tube to move relative to the large-diameter tube, and a state in which the small-diameter tube is engaged with both the large-diameter tube and the small-diameter tube, preventing the small-diameter tube from moving relative to the large-diameter tube. In such a situation, the snap-fitting portion 84 can be implemented using a spring lock, a pin lock, a lock nut, or the like.

[0043] As a component constituting the position adjustment mechanism 82A, an electric mechanism component such as a stepping motor is detachably housed in the common portion 70. After the position change portion 80A is changed and fixed at a specific position, the mechanism component can be removed from the common portion 70.

[0044] The position changing portion 80A can be repositioned in the midfoot portion along the width direction of the shoe last 1. By changing the position of the position changing portion 80A by increasing the distance between the left and right position changing portions 80A, the width dimension of the midfoot portion of the shoe last 1 increases. By changing the position of the position changing portion 80A by decreasing the distance between the left and right position changing portions 80A, the width dimension of the midfoot portion of the shoe last 1 decreases.

[0045] Figure 7 80A and the common portion 70 are arranged in a gap between the position change portion 80A and the common portion 70. Figure 5 、 Figure 6 As shown, the left and right position changing parts 80A are moved to separate them from the common part 70, and the distance between the position changing parts 80A is increased, so that a gap is formed between the position changing parts 80A and the common part 70. Figure 7In the structure shown, a flat plate-shaped assembly shoe last portion 88 is arranged in the gap between the position change portion 80A and the common portion 70. The number of assembly shoe last portions 88 arranged in the gap can be appropriately changed according to the size of the gap. Figure 7 In the illustrated example, two assembly last portions 88 are disposed between the left and right position changing portions 80A and the common portion 70 .

[0046] Figure 8 1 is a side view of the shoe last 1 with the position of the position changing portion 80B changed in the height direction. Figure 8 As shown, the position changing portion 80B is connected to the common portion 70 via a position adjusting mechanism 82B. The position adjusting mechanism 82B changes the position of the position changing portion 80B relative to the common portion 70. In addition, the position adjusting mechanism 82B can fix the position changing portion 80B after the position change at a specific position. The position adjusting mechanism 82B includes a locking portion 84. Figure 5 、 Figure 6 The engaging portion 84 shown acts on the position changing portion 80A in the same manner. Figure 8 The engaging portion 84 shown switches between a first state in which the position changing portion 80B is fixed and a second state in which the position changing portion 80B is movable.

[0047] The position-changing portion 80B can be repositioned in the midfoot region along the height direction of the shoe last 1. The position-adjusting mechanism 82B moves the position-changing portion 80B upward, increasing the distance between the position-adjusting portion 80B and the common portion 70, thereby increasing the height dimension of the midfoot region of the shoe last 1. The position-adjusting mechanism 82B moves the position-adjusting portion 80B downward, decreasing the distance between the position-adjusting portion 80B and the common portion, thereby decreasing the height dimension of the midfoot region of the shoe last 1.

[0048] Figure 9 : is a side view of the shoe last 1 in which the angle of the position changing portion 80B relative to the common portion 70 is changed. Figure 9 The position adjustment mechanism 82B (not shown) is connected to the common portion 70. The position changing portion 80B can change the angle relative to the common portion 70 in the midfoot portion.

[0049] The position adjustment mechanism 82B includes a rotation shaft extending in the width direction, and the position changing portion 80B is supported by the rotation shaft. Figure 9 As shown by the arrow in FIG, the position changing unit 80B rotates about the rotation axis. The position adjustment mechanism 82B may include a gear capable of adjusting the angle in multiple stages. The position adjustment mechanism 82B may include a universal joint. The position changing unit 80B may be supported by the universal joint, allowing for multi-axis rotation.

[0050] Figure 101 is a plan view of the shoe last 1 covered by the cover 90. The shoe last 1 may be such that at least a portion thereof is covered by the cover 90 from the outside. Figure 10 As shown, in the case of a shoe last 1 including a position-changing portion 80, in which a gap is formed between the shoe last 1 and the common portion 70 due to the position change of the position-changing portion 80, the cover 90 can be shaped to cover at least the gap formed in the shoe last 1. The entire shoe last 1 can be covered from the outside by the cover 90. The cover 90 can be in the form of a sheet or a plate.

[0051] For example, a film that shrinks when heated, such as a polystyrene film, can be used as the covering 90. In this case, the covering 90 covering the surface of the shoe last 1 is formed by covering the shoe last 1 with the film and then heating and deforming the film. While the covering 90 is being thermally deformed, air (warm air) is blown from the inside of the covering 90. In this case, excessive inward shrinkage of the covering 90 at the connection between the position-changing portion 80 and the common portion 70 can be suppressed, thereby improving the precision of the upper's molding.

[0052] The cover 90 may be a metal foil such as aluminum foil. In this case, by covering the surface of the shoe last 1 with metal, thermal conductivity is improved, which is advantageous in the heat forming of the shoe upper described below. Alternatively, the cover 90 may be a sock.

[0053] The characteristic structure and effects of this embodiment are listed below, and some of the descriptions may overlap with the above descriptions.

[0054] like Figure 4 As shown, the shoe last 1 of the embodiment includes a common portion 70 whose shape and position remain unchanged, and a position changing portion 80 whose shape remains unchanged and whose position relative to the common portion 70 can be changed. Figures 5 and 6 、 Figure 8 As shown, the shoe last 1 includes a position adjustment mechanism 82. The position adjustment mechanism 82 changes the position of the position change portion 80 relative to the common portion 70 and fixes the position change portion 80 at a specific position.

[0055] The shoe last 1 is divided, and position-changing sections 80 are used in areas where the shapes of individual users are less likely to differ, but the positions of those areas can vary. Based on the target user's foot model FM, the position adjustment mechanism 82 is adjusted to change the position of the position-changing section 80 relative to the common section 70, and the position-changing section 80 is fixed at the changed position. This allows for the provision of a shoe last 1 tailored to the shape of each user's foot F in a short period of time. Consequently, a shoe last 1 tailored to each user's foot F can be provided with a simple structure.

[0056] By using the common portion 70 whose shape and position remain unchanged in a part where the foot shapes of different users are less likely to differ and the shape and position of the shoe last 1 do not need to be changed, the structure of the shoe last 1 can be simplified, thereby shortening the time for adjusting the shape of the shoe last 1 to adapt to the user's foot shape.

[0057] like Figure 5 、 Figure 6 As shown, the position-adjusting portion 80A can be adjusted in the width direction of the midfoot portion of the shoe last 1. In the shoe last 1, by providing a pair of left and right position-adjusting portions 80A at the portion corresponding to the transverse arch of the foot, an adjustment margin for the width dimension of that portion is provided. This allows the width dimension of the shoe last 1 at the portion corresponding to the transverse arch of the foot to be tailored to the shape of the user's foot.

[0058] like Figure 8 As shown, the position change portion 80B can be adjusted in the height direction of the midfoot portion of the shoe last 1. By using the position change portion 80B in the area corresponding to the instep of the foot, the height dimension of the area of ​​the shoe last 1 can be adjusted to the shape of the user's foot.

[0059] like Figure 9 As shown, the position changing portion 80B can change the angle relative to the common portion 70 in the midfoot portion of the shoe last 1. In the shoe last 1, by further adjusting the angle of the portion corresponding to the instep, the shape of the portion corresponding to the instep can be more accurately adapted to the shape of the user's foot.

[0060] like Figures 5 and 6 、 Figure 8 As shown, the position adjustment mechanism 82 may include a snap-fit ​​portion 84. The snap-fit ​​portion 84 switches between a first state, in which the position change portion 80 is fixed in a specific position, and a second state, in which the position change portion 80 is movable. Setting the snap-fit ​​portion 84 to the second state allows the position change portion 80 to move to a position that matches the shape of the user's foot. Once in that position, setting the snap-fit ​​portion 84 to the first state fixes the position change portion 80. By setting the snap-fit ​​portion 84 to the first state, the position change portion 80A becomes immovable in both widthwise directions, and the position change portion 80B becomes immovable in both heightwise directions. This allows the shoe last 1 to be reliably formed into the target shape that matches the user's foot F.

[0061] like Figure 7As shown, the shoe last 1 may further include an assembly last portion 88. The assembly last portion 88 is disposed in the gap between the position-changing portion 80A, which has been repositioned relative to the common portion 70, and the common portion 70. After the position-changing portion 80 is repositioned, a gap or step may be formed between the outer surfaces of the common portion 70 and the position-changing portion 80 due to differences in position and shape. By arranging the assembly last portion 88 within this gap or step, the outer surfaces of the common portion 70 and the position-changing portion 80 can be smoothly connected.

[0062] also, Figure 7 The illustrated assembly last portion 88 is arranged to extend in the longitudinal direction, but an assembly last portion 88 extending in the width direction may be provided depending on the shape of the gap and the step. Figure 11 1 is a plan view of a shoe last 1 including an assembly shoe last portion 88 extending in the width direction. Figure 11 As shown, by providing the assembly last portion 88 with a step between the position changing portion 80 protruding from the common portion 70 in the width direction and the common portion 70 , the step is reduced, and the width direction dimensions of the shoe last 1 are smoothly connected.

[0063] like Figure 10 As shown, the shoe last 1 may further include a sheet-like or plate-like covering 90 that covers at least a portion of the shoe last 1 or a gap formed in the shoe last 1 from the outside. Covering the shoe last 1 with the covering 90 eliminates the gap and step between the common portion 70 and the position-changing portion 80 when the shoe last 1 of this embodiment is used to form a shoe upper, thereby minimizing the effect of the gap and step on the shape of the formed shoe upper. Consequently, a shoe upper of a specific shape can be more reliably formed.

[0064] like Figures 1 to 3 As shown, a foot model FM is generated based on the image data obtained by shooting the user's foot F, and a shoe last model 100 is generated based on the foot model FM. Based on the shoe last model 100, as shown Figure 5 、 Figures 8 and 9 By moving the position changing unit 80 to the appropriate position as shown, the shoe last 1 is formed into a final shape corresponding to the user's foot model FM. The shoe last model 100 comprises appropriate position data indicating the appropriate position of the position changing unit 80 relative to the common portion 70. This ensures that the shoe last 1 corresponding to the shape of the user's foot F can be formed.

[0065] [Second embodiment]

[0066] Figure 12 1 is a perspective view of the shoe last 1 of the second embodiment. In the first embodiment, the line connecting the boundary between the common portion 70 and the position changing portion 80A, that is, the line connecting the gap formed therebetween is as shown in FIG. Figure 4 As shown in the figure, it is a straight line. Figure 12As shown, the line connecting the common portion 70 and the boundary portion 75 of the position-changing portion 80 may also be a curved line. Furthermore, the line connecting the common portion 70 and the boundary portion 75 of the position-changing portion 80 corresponds to a line running along the metatarsal bones of, for example, the first and fifth toes of the wearer. There is no limitation on which metatarsal bones the line connecting the boundary portion 75 runs along. The line connecting the boundary portion 75 running along the metatarsal bones means that the line connecting the boundary portion 75 only needs to include a portion substantially parallel to the metatarsal bones along at least a portion of its length.

[0067] By determining the shapes of the common portion 70 and the position-changing portion 80A in this manner, the shape of the shoe last 1 can be more accurately adapted to the shape of the user's foot.

[0068] [Third embodiment]

[0069] Figure 13 1 is a perspective view of a shoe last 1 according to a third embodiment. In the first embodiment, an example has been described in which the portion of the midfoot corresponding to the instep is set as the position changing portion 80B. Alternatively, Figure 13 As shown, the portion corresponding to the instep is the assembly last portion 10. The assembly last portion 10 is assembled into a groove formed in the common portion 70 or into a space formed between the common portion 70 and the position changing portion 80, thereby constituting a part of the shoe last 1.

[0070] Figure 13 The assembled shoe last 10 shown is formed by assembling a plurality of foot-length defining members 20 and a plurality of foot-width defining members 40. The foot-length defining members 20 have a plate-like shape extending in the longitudinal direction. They define the shape of the shoe last 1 at least in the longitudinal direction. The foot-width defining members 40 have a plate-like shape extending in the width direction. The foot-width defining members 40 define the shape of the shoe last 1 at least in the width direction and are assembled to the foot-length defining members 20.

[0071] The foot length forming member 20 and the foot width forming member 40 can be formed by cutting from a sheet-like base member. The foot length forming member 20 and the foot width forming member 40 can be made of paper such as cardboard, or can be made of a resin such as a thermoplastic resin. The foot length forming member 20 and the foot width forming member 40 can include a snap-fit ​​groove for assembling them together.

[0072] The area corresponding to the back of the midfoot is where foot shapes vary most from user to user. By forming a groove or space at this location, using an assembly last 10, the shape of the shoe last 1 can be more accurately adapted to the user's foot shape. A customized assembly last 10 can also be manufactured for each user. Alternatively, multiple assembly lasts 10 of different shapes can be prefabricated, and the one with the shape that most closely matches the user's foot model FM can be selected for use.

[0073] [Fourth embodiment]

[0074] Figure 14 : is a perspective view of the shoe last 1 of the fourth embodiment. In the third embodiment, the assembly shoe last portion 10 in which the foot length forming member 20 and the foot width forming member 40 are exposed to the outer surface of the shoe last 1 has been described. Figure 14 As shown, the assembly last portion 10 may be formed in such a manner that only the foot-width forming member 40 is exposed to the outer surface of the shoe last 1 . Figure 14 The foot width forming member 40 shown is formed as a plate-like member extending in the width direction. The assembled shoe last 10 includes a plurality of foot width forming members 40. The foot width forming members 40 may be cut out from a sheet-like base member based on the user's foot model FM.

[0075] Figure 15 It is a perspective view of the assembled last portion 10 according to the fourth embodiment. Figure 16 FIG. 1 is an exploded perspective view of the assembled shoe last portion 10 according to the fourth embodiment. Figure 15 、 Figure 16 As shown, the foot length forming member 20 has a rod-like shape. The foot length forming member 20 is formed as a rod-like member extending in the longitudinal direction. The foot width forming member 40 is formed with two through holes 42 for the rod-like foot length forming member 20 to pass through.

[0076] The foot-width forming member 40 is assembled to the foot-length forming member 20 by passing the rod-shaped foot-length forming member 20 through the through-hole 42. This simplifies the structure of the assembled shoe last 10, stabilizes the shape of the assembled shoe last 10, and increases the speed of assembling the shoe last 10. The number of through-holes 42 in the rod-shaped foot-length forming member 20 and the foot-width forming member 40 is not limited to two as shown, but may be any number, one or more. Alternatively, a groove into which the rod-shaped foot-length forming member 20 can be inserted may be formed in the foot-width forming member 40 in place of the through-hole 42.

[0077] The plurality of foot width forming members 40 arranged in the longitudinal direction may have the same plate thickness, but may also have the same plate thickness as shown in FIG. Figures 14 to 16 The shoe last 1 has different plate thicknesses as shown. Specifically, the thickness of the foot width forming member 40 can be made different by making the plate thickness of the foot width forming member 40 larger near the toes and smaller near the heel. The shape of the instep changes in a manner that gradually becomes larger as it bends from the toe side to the heel side. On the heel side where the shape of the instep changes greatly, by reducing the thickness of the foot width forming member 40, the height and width dimensions of the shoe last 1 can be adjusted to be thinner. Therefore, the reproducibility of the shoe last 1 to the user's foot shape can be further improved.

[0078] By not excessively reducing the thickness of the foot width forming member 40 on the toe side where the shape of the instep is less variable, the number of components constituting the assembly last 10 can be reduced.

[0079] like Figures 14 to 16 As shown, the plurality of foot width forming members 40 may be arranged without gaps along the length direction, or gaps may be formed between adjacent foot width forming members 40 along the length direction. In such cases, the intervals between adjacent foot width forming members 40 can be determined by arranging spacers between adjacent foot width forming members 40. The spacers may be provided as separate members from the foot length forming members 20 and the foot width forming members 40, or they may be provided integrally with the foot width forming members 40.

[0080] Figure 17 : is a perspective view of the common portion 70 of the fourth embodiment. Figure 17 As shown, a receiving hole 72 is formed in the common part 70. Two receiving holes 72 with bottoms are formed in the common part 70 constituting the toe part of the shoe last 1, and two receiving holes 72 with bottoms are formed in the common part 70 constituting the heel part of the shoe last 1. Figure 15 、 Figure 16 The common portion 70 includes the same number of receiving holes 72 formed in the rod-shaped foot-length forming member 20. The receiving holes 72 extend in the longitudinal direction. The receiving holes 72 are formed in the same shape and on the same straight line extending in the longitudinal direction. The end portions of the foot-length forming member 20 are received in the receiving holes 72.

[0081] By forming a receiving hole 72 in the common portion 70 for passing the rod-shaped foot length forming member 20 and supporting it at a specific position, the foot length forming member 20 can be supported at an appropriate position on the common portion 70. Therefore, the assembled shoe last 10, in which the plate-shaped foot width forming member 40 is assembled to the rod-shaped foot length forming member 20, can be fixed at an appropriate position relative to the common portion 70.

[0082] In addition to the structure described in the third embodiment, which combines a plate-shaped foot-length forming member 20 with a foot-width forming member 40, or the structure described in the fourth embodiment, which assembles a plate-shaped foot-width forming member 40 onto a rod-shaped foot-length forming member 20, the assembled shoe last 10 may also be a block-shaped member formed by solidifying a resin or slurry. The block-shaped assembled shoe last 10 may be solid or hollow. Alternatively, the assembled shoe last 10 may be a solid molded product produced using a 3D printer.

[0083] [Fifth embodiment]

[0084] In the above embodiment, the shoe last 1 is described as an example in which the portion from the midfoot to the heel is formed as the common portion 70. Instead of the above example, the shoe last 1 may include the position changing portion 80 also in the heel portion. Figure 18 It is a side view of the shoe last 1 of the fifth embodiment. Figure 19 It is a plan view schematically showing the position change of the heel position change unit 80 . Figure 20 This is a side view of the shoe last with the position of the heel position changing portion 80 changed.

[0085] like Figures 18 to 20 As shown, the heel position change unit 80 may include a position change unit 80C, located at the rearmost portion of the heel. The position change unit 80C is reciprocally movable along the length of the shoe last 1, adjusting the longitudinal dimension of the shoe last 1. The heel position change unit 80 may also include a position change unit 80D, located at the lateral portion of the rear foot corresponding to the lateral malleolus and / or medial malleolus of the foot. The position change unit 80D is movable along the width of the shoe last 1, adjusting the width of the rear foot of the shoe last 1. The heel position change unit 80 is movable in addition to the longitudinal and width directions. The heel position change unit can adjust its angle relative to the common portion 70. Cavities are formed above and below the heel position change unit to allow for movement of the position change unit 80. These cavities are filled with the assembled shoe last 10, which is shaped to fit the user's foot F.

[0086] exist Figure 20 In the shoe last 1 shown, the position-changing portion 80C moves rearward in the longitudinal direction and then becomes fixed in position after moving upward. The position-changing portion 80D moves in the width direction and becomes fixed at a position where the distance between the left and right position-changing portions 80D is increased. As described above, by including position-changing portions 80C and 80D that can change position in the heel portion of the shoe last 1 in addition to the position-changing portions 80A and 80B that can change position in the midfoot portion of the shoe last 1, the shape of the shoe last 1 can be more accurately adapted to the shape of the user's foot, or the shoe last 1 can be formed into a desired shape.

[0087] [Sixth embodiment]

[0088] In the sixth embodiment, a method for manufacturing a shoe upper using the shoe last 1 described in the previous embodiment will be described. Figure 21 This is a perspective view showing a state where the pre-molded upper 200 is covered on the shoe last 1. For example, a material for the upper (pre-molded upper 200) comprising a fiber sheet containing heat-shrinkable yarn is prepared. The pre-molded upper 200, which is larger than the outer shape of the shoe last 1, is covered on the shoe last 1 to obtain Figure 21 The structure shown.

[0089] Figure 22 1 is a schematic diagram showing a process of heating the pre-molded upper 200 covered on the shoe last 1. Figure 22 As shown, the shoe last 1, covered with the pre-molded upper 200, is stored inside a heating box 210. In this state, high-temperature steam 220 is released from the inner surface of the heating box 210. This steam heats the pre-molded upper 200. This steam heating uniformly heats the entire pre-molded upper 200. The heating causes the heat-shrinkable yarn to shrink, allowing the pre-molded upper 200 to conform to the shape of the shoe last 1 and become the post-molded upper.

[0090] By going through such a manufacturing process, a user-specific upper that conforms to the shape of the user's foot F can be manufactured without using large-scale equipment.

[0091] The heating box 210 can be a steam oven. Furthermore, the pre-molded upper 200 can be heated using methods other than steam heating, such as hot air heating or warm water heating. The pre-molded upper 200 can also be heated locally rather than as a whole. The resulting post-molded upper can be attached to a separately manufactured sole by gluing, heat sealing, or the like.

[0092] During each of the above-mentioned processing steps, or after all the processing steps are completed, the tongue is formed, the shoe opening is processed, the holes for passing the shoelaces are installed, the decorative components and labels are installed, the trademark is printed, the insole is installed, etc. are appropriately performed to manufacture the shoes.

[0093] The method for manufacturing the shoe upper is not limited to the heat shrinking of the fiber sheet containing the heat shrinkable yarn. For example, various methods such as directly weaving fabric around the shoe last 1 or laminating with a 3D printer may also be used. The shoe last 1 of the embodiment can also be used in the conventional upper forming process in the factory.

[0094] (Summary of Disclosure in Implementation Methods, etc.)

[0095] The characteristic structures disclosed in the above-described embodiments and their modifications are summarized as follows.

[0096] According to one embodiment of the present disclosure, a shoe last is used to form a shoe upper. The shoe last comprises: a common portion, whose shape and position remain unchanged; a position-adjusting portion, whose shape remains unchanged but whose position relative to the common portion can be adjusted; and a position adjustment mechanism for adjusting the position of the position-adjusting portion relative to the common portion and fixing the position-adjusting portion in a specific position.

[0097] In the shoe last according to one embodiment of the present disclosure, the position changing portion can change position at the midfoot portion of the shoe last along the width direction of the shoe.

[0098] In the shoe last according to one embodiment of the present disclosure, the position changing portion can change position along the height direction at the midfoot portion of the shoe last.

[0099] In the shoe last according to one embodiment of the present disclosure, the position changing portion can change an angle relative to the common portion at the midfoot portion of the shoe last.

[0100] In the shoe last according to one embodiment of the present disclosure, the position adjustment mechanism may include a locking portion that switches between a first state in which the position changing portion is fixed at a specific position and a second state in which the position changing portion is movable.

[0101] In the shoe last according to one embodiment of the present disclosure, a line connecting the common portion and the boundary portion of the position change portion may be a straight line or a curved line corresponding to a line along metatarsal bones of a wearer's foot.

[0102] The shoe last according to an embodiment of the present disclosure may further include an assembled shoe last portion, wherein the assembled shoe last portion is assembled in a groove formed in the common portion or in a space portion formed between the common portion and the position changing portion.

[0103] In the shoe last according to one embodiment of the present disclosure, the assembly last portion may include a plurality of plate-like members extending along a width direction of the shoe.

[0104] In the shoe last according to one embodiment of the present disclosure, the assembly last portion may include a rod-shaped member extending along the length direction of the shoe, and a through hole for the rod-shaped member to pass through is formed in the plate-shaped member.

[0105] In the shoe last according to one embodiment of the present disclosure, a receiving hole for receiving the end portion of the rod-shaped member is formed in the common portion.

[0106] The shoe last according to an embodiment of the present disclosure may further include an assembled shoe last portion, wherein the assembled shoe last portion is disposed in a gap between the position-changed portion whose position relative to the common portion is changed and the common portion.

[0107] The shoe last according to one embodiment of the present disclosure may further include a sheet-shaped or plate-shaped covering body, which covers at least a portion of the shoe last from the outside or is formed in a gap of the shoe last.

[0108] A method for manufacturing a shoe last according to an embodiment of the present disclosure is a method for manufacturing a shoe last for forming a shoe upper. The method for manufacturing a shoe last includes the following steps. The first step is to prepare a shoe last, which includes: a common part whose shape and position remain unchanged; a position-changing part whose shape remains unchanged and can change its position relative to the common part; and a position-adjusting mechanism that changes the position of the position-changing part relative to the common part and fixes the position-changing part at a specific position. The second step is to adjust the position-adjusting mechanism to change the position of the position-changing part relative to the common part.

[0109] In the manufacturing method of the shoe last according to an embodiment of the present disclosure, the second process of changing the position of the position changing part may include: a process of generating a user's foot model; a process of generating appropriate position data representing the appropriate position of the position changing part relative to the common part from the foot model; and a process of moving the position changing part to the appropriate position based on the appropriate position data.

[0110] A method for manufacturing a shoe upper according to one embodiment of the present disclosure includes the following steps: The first step is to cover a pre-molded shoe upper comprising a fiber sheet containing heat-shrinkable yarn on a shoe last of any of the aforementioned aspects; and the second step is to heat the pre-molded shoe upper so that it conforms to the shape of the shoe last to form a post-molded shoe upper.

[0111] While the embodiments of the present invention have been described, the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims, and is intended to encompass all modifications within the meaning and scope of the claims.

Claims

1. A shoe last, used to form the upper of a shoe, comprising: The shape and position of the common part remain unchanged; a position changing portion having a constant shape and capable of changing its position relative to the common portion; a position adjustment mechanism for changing the position of the position changing portion relative to the common portion and fixing the position changing portion at a specific position; and The shoe last is assembled to the groove formed in the common part or the space formed between the common part and the position changing part, and forms a portion corresponding to the instep of the wearer of the shoe. The assembly last includes a plurality of plate-shaped members extending along a width direction of the shoe.

2. The shoe last according to claim 1, wherein The position changing portion can change position along the width direction of the shoe at the midfoot portion of the shoe last.

3. The shoe last according to claim 1 or 2, wherein The position changing portion can change its position along a height direction at the midfoot portion of the shoe last.

4. The shoe last according to claim 1 or 2, wherein The position changing portion can change an angle relative to the common portion at a midfoot portion of the shoe last.

5. The shoe last according to claim 1 or 2, wherein The position adjustment mechanism includes an engaging portion that switches between a first state in which the position changing portion is fixed at a specific position and a second state in which the position changing portion is movable.

6. The shoe last according to claim 1 or 2, wherein A line connecting the common portion and the boundary portion of the position changing portion is a straight line or a curved line corresponding to a line along the metatarsal bones of a foot of a person wearing the shoe.

7. The shoe last according to claim 1, wherein The shoe last assembly includes a rod-shaped member extending along the length direction of the shoe, and a through hole for the rod-shaped member to pass through is formed in the plate-shaped member.

8. The shoe last according to claim 7, wherein The common portion has a receiving hole formed therein for receiving an end portion of the rod-shaped member.

9. The shoe last according to claim 1 or 2, further comprising: The flat plate-shaped assembly last portion is arranged in a gap between the common portion and the position-changing portion whose position is changed relative to the common portion.

10. The shoe last according to claim 1 or 2, further comprising: The sheet-shaped or plate-shaped covering body covers at least a portion of the shoe last from the outside or is formed in a gap of the shoe last.

11. A method for manufacturing a shoe last for shaping a shoe upper, comprising: A process for preparing a shoe last, the shoe last comprising: a common portion having a constant shape and position; a position-changing portion having a constant shape and capable of changing its position relative to the common portion; a position-adjusting mechanism for changing the position of the position-changing portion relative to the common portion and fixing the position-changing portion at a specific position; and an assembled shoe last portion, assembled into a groove formed in the common portion or into a space formed between the common portion and the position-changing portion, and constituting a portion corresponding to the instep of a wearer of the shoe, the assembled shoe last portion comprising a plurality of plate-like members extending in a width direction of the shoe; and a step of adjusting the position adjustment mechanism to change the position of the position changing portion relative to the common portion.

12. The method for manufacturing a shoe last according to claim 11, wherein The modified process includes: The process of generating a user's foot model; a step of generating, from the foot model, appropriate position data indicating an appropriate position of the position changing portion relative to the common portion; and a step of moving the position changing unit to the appropriate position based on the appropriate position data.

13. A method for manufacturing a shoe upper, comprising: The process of covering a pre-molded shoe upper comprising a fiber sheet containing heat-shrinkable yarn on a shoe last according to any one of claims 1 to 10; and The process of heating the pre-molded shoe upper to conform to the shape of the shoe last to form a post-molded shoe upper.

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