JP2011525823A - Method and system for producing a three-dimensional shape from assembled parts having different elastic properties - Google Patents

Abstract

The present invention relates to a method of manufacturing a three-dimensional shape of a leather bag or similar item by assembling two types of assembly parts (structural parts and deformed parts) having different elastic properties, Applying tension to a deformed part having a higher elastic characteristic; bonding a structural part having a relatively lower elastic characteristic to the deformed part under tension; and stressing the structural part Releasing the tension applied to the deformed part, and deforming the structural part to obtain a desired three-dimensional shape.
[Selection] Figure 1

Description

  The present invention relates to a method for producing a three-dimensional shape from assembled parts having different elastic properties, a system for carrying out the method, and a bag and similar items produced by the method of the present invention, or more generally three-dimensional. The present invention relates to a leather product such as a product having a shape. The present invention is particularly applicable to leather products or products having a three-dimensional shape, at least partly made of leather, but is not limited thereto.

  The present invention relates to the industrial field of deforming flat materials for the purpose of producing a three-dimensional shape. In this application, the term “shape” is not only used in its original meaning (“geometric shape”), but also, for example, an object having the above-mentioned geometric characteristics for creating a three-dimensional shape. Also means an object or an assembly.

  Consider the field of leather products of particular interest to the inventor. Today, when a leather craftsman wants to make a leather bag with a three-dimensional shape, a specific structure or skeleton part to make the bag skeleton (prototype) on the base material where the leather parts are assembled and held in the desired shape Forced to use. This structure or skeletal part determines the final shape of the bag. As a result, manufacturing requiring a large number of elements and assembly is complicated and expensive. Furthermore, once the bag is assembled and shaped, it is very difficult to make a shape that is slightly different from the intended shape due to the presence of structures or skeleton parts that prevent deformation. Therefore, it is useful to easily deform a bag having a predetermined shape for reasons such as bulkiness and storage while maintaining the possibility of returning to the original shape.

  The object of the present invention is to provide a method that makes it possible to obtain a three-dimensional shape without the need for a specific structure or skeletal part.

The above object of the present invention can be achieved by a method comprising the following steps for producing a three-dimensional shape from two kinds of assembled parts having different elastic characteristics.
Applying and maintaining tension on deformed parts having relatively higher elastic properties;
Bonding a structural part having a relatively lower elastic property with a deformed part under tension; and releasing the tension applied to the deformed part that stresses the structural part, deforming the structural part, and as desired The process of obtaining the three-dimensional shape.

  According to the method of the present invention, it is possible to obtain a balanced three-dimensional shape exhibiting both stability and flexibility characteristics. Stability is due to the self-holding properties of the structural parts that create the body itself in a three-dimensional shape. However, the structural part exhibits the desired flexibility, itself helps in deformation and is essential especially for curvature.

  In a particular aspect of the invention, structural parts and deformed parts are used that are formed into a sheet or skin that is thinner than other dimensions.

  In another aspect of the present invention, the method includes a step of cutting at least one of two types of parts, a structural part and a deformed part, after forming a three-dimensional shape.

  In still another aspect of the present invention, the method includes a step of cutting at least one of two types of parts, a structural part and a deformed part, before forming a three-dimensional shape.

  The bonding process consists of spraying a moisture-resistant adhesive on the structural part and the deformed part.

  Limiting the area of the structural parts to be bonded is advantageously performed.

  Leather structural parts are used in the method of the present invention.

  The invention also relates to a method for assembling at least two types of structural parts preformed by a method having all or part of the above-mentioned properties.

According to another aspect of the present invention, a system consisting of the following for producing a three-dimensional shape from two types of assembled parts having different elastic properties is proposed.
Means for applying tension to a deformed part having relatively higher elastic properties and maintaining the tension for a predetermined time;
Means for bonding structural parts having relatively lower elastic properties to deformed parts under tension;
Deactivation of the means to maintain the deformed parts in a tensioned state in order to obtain a three-dimensional shape.

  The system of the present invention also includes means for cutting at least one of the two types of parts after obtaining the three-dimensional shape.

  The system of the present invention also includes means for cutting at least one of the two types of parts prior to tensioning the deformed part.

  According to the invention, leather structural parts are used in the system of the invention.

  The present invention also relates to a system for assembling at least two types of structural parts, including means for assembling a pre-formed structural part with a system having all or part of the aforementioned characteristics.

  According to yet another aspect of the invention, a method is made at least in part from an assembly of deformed parts and structural parts, in particular made of leather and having all or part of the properties already described in detail. Have proposed leather products such as bags formed in a three-dimensional shape and similar items.

Other advantages and features of the present invention are not limited to the description of the embodiments, but will become apparent from the detailed description of each embodiment and the accompanying drawings.
FIG. 1 shows different steps of the method of the present invention, and FIG. 2 is a cross-sectional view of a composite cylinder (pack) obtained using the method of the present invention.

  Hereinafter, the method of the present invention and the technical means implemented in the method will also be described with reference to FIG.

  In a sense, two types of parts forming a skin, sheet or layer are assembled using the method of the present invention, with the thickness formed thin compared to other dimensions. These two types of parts have different elastic properties. A part having a relatively higher elastic characteristic is expressed as a “deformed part” and a part having a relatively lower elastic characteristic is expressed as a “structural part” in relation to each function of the manufactured assembly.

  The structural parts are typically made of leather. Structural parts are required to have essential mechanical stability and stiffness, particularly in the traction (friction) / compression in the plane or tangential direction of the surface (if flat). The structural part resists deformation under the influence of stress applied perpendicular to its surface. This structural part is also required to have a relatively good curvature aptitude. Thus, the structural parts have the mechanical strength and flexibility of the material. For deformed parts that exhibit superior elastic properties compared to structural parts, these mechanical stability, strength and stiffness need to be considered.

  First, a deformed part 1 is prepared and cut from a material such as “Bengaline Lycra” ® or a material based on “elastane” ®. This deformable part constitutes a backing (lining) that may be woven in a decorative or imaginary design.

  In the first step, the deformable part 1 is cut in accordance with a preset pattern as a function of the required three-dimensional shape, that is, as a function of finally deforming the structural part.

  Next, the deformable part 1 is set in a tension load machine including two parts (jigs) 10 and 11 into which the end portions are inserted, so that one function, particularly an elastic function of the deformed part is exhibited. It is maintained in a state where a tension is applied with a tension force F determined in (2).

  This tension force F must be maintained such that the tension applied to the deformed part is less than its breaking force.

  Next, an adhesive is applied to one of the surfaces of the deformable part 1 by spraying using an appropriate device 12 disposed opposite the deformable part 1 (third step). The adhesive used is preferably a strong adhesive with minimal sensitivity to environmental conditions, especially humidity levels and temperature changes. The adhesive must not shrink when exposed to water or heat. For example, “neoprene” (registered trademark) or its equivalent can be used, but those that respect the environment and health are preferred.

  At the same time or before this step, the structural part 2 is prepared and cut from leather or similar material. This material constitutes both the body body and the three-dimensional bag. A structural part is placed on one of these surfaces designed to be applied to the deformed part and the same adhesive as that used to adhere the deformed part is applied (fourth step). When the structural part 2 is leather, the adhesive is preferably applied to the so-called “nubuck” surface.

  The deformable part 1 and the structural part 2 to which the adhesive has been applied are then set and bonded together, but at this time, the deformable part 1 is still in a state where tension is applied (fifth step).

  When the adhesive setting time has elapsed, the tension force F is released, the formed composite part 1 + 2 is removed, and a three-dimensional curved shape is immediately formed (sixth step).

  Due to the release of the tension force F, the deformed part 1 that has been previously stretched contracts to return to its original shape. However, the deforming part 1 does not return to the original initial shape accurately because the resistance force by the structural part 2 acts. The curvature of the composite part 1 + 2 is due to the difference in tension forces acting on the structural part 2 (in terms of stiffness) and the deformed part 1 (in terms of elasticity) respectively, and the layer 1 in which these two types of parts are firmly bonded to each other. Caused by the fact that it forms two. Due to the stress applied to the structural part 2 by the deformable part 1, a curved shape is formed so that the structural part 2 is positioned on the convex side and the deformed part 1 is positioned on the concave side.

  It should also be noted that the structural part performs the function of a spring when acting in bending.

  This composite part 1 + 2 is completed by assembling other structural parts (seventh step).

  This assembly (assembly) can be performed by a known method such as sewing or bonding. In the application of the structural part 2 to a leather product, for example, a bag-like body shape that is completed by another piece of leather 22 that closes the end of the bag-like body so as to form the bag 20 is adopted. Thereafter, accessories such as a handle 21 and a fastener (fastener) are attached to the bag 20.

  Said manufacturing process can also be automated using the latest industrial manufacturing methods. There are a variety of devices for cutting parts, applying tension, applying adhesives, bonding layers and assembling, and various devices can be used with digital monitoring / operating means. If there is, it can be robotized. The material such as the woven fabric used for the deformable part is a standardized material, so that certainty regarding the result (final finished product), ie the required three-dimensional shape, can be reliably achieved.

  It should be noted that the method of the present invention is applicable both when the surface of the structural part and the deformed part is small and large. In fact, the surface of the part is not a critical factor in the practice of the present invention.

  In the application to leather products described above, the resulting bag 20 exhibits a three-dimensional shape permanently without the use of specific reinforcement or holding parts to form a structure (framework) or skeleton. As can be seen from FIG. 2, maintenance is achieved directly through the layer of leather 2 (structural parts), the grain side (skin) 23 of the leather constituting the outer surface of the cylinder. The deformation is caused by a layer of fabric 1 (deformed part) having elastic properties, one side of which constitutes the backing of the bag, the layer of adhesive 3 is the nubuck of the layer of leather 2 and the fabric 1 Between the opposite surfaces of the layers. One advantage of the present invention lies in the fact that each of the structural part and the deformed part performs three functions. The first function is mechanical characteristics necessary to obtain a desired three-dimensional shape, strength characteristics in the case of structural parts, and shrinkage characteristics in the case of deformed parts. The second function is to cover and form simultaneously as a container (inner wall of the bag). The third function is to create the inner / outer style of the bag (visual or tactile). It should be noted that these three functions can only be achieved by two types of parts bonded together.

  Needless to say, the present invention is not limited to the above-described embodiments, and many modifications can be applied to these embodiments without departing from the scope of the invention.

  In particular, the method of the present invention for producing a three-dimensional shape can be applied to the production of objects for various uses or industrial creations outside the field of leather products.

  The material used may be substantially different from the above material as long as it satisfies the condition that the two types of assembly parts have different elastic properties.

Claims (15)

A method for producing a three-dimensional shape of a leather bag or a similar item by assembling a structural part and a deformable part having mutually different elastic characteristics, the method comprising the following steps:
Applying a tension to a deformed part having relatively higher elastic properties;
Bonding a structural part having relatively lower elastic properties to the deformed part under tension;
The structure part is deformed by releasing the tension applied to the deformed part that is stressing the structural part and bending the structural part, and the deformed part is positioned on the concave side. Obtaining a desired three-dimensional shape in a curved state.   The method according to claim 1, wherein the structural part and the deformable part are formed in a sheet or skin shape having a thickness smaller than that of other dimensions than the thickness.   The method according to claim 1, further comprising a step of cutting at least one of the two types of the structural part and the deformed part used for manufacturing a three-dimensional shape.   The method according to claim 1, further comprising a step of cutting at least one of the two types of structural parts and the deformed part before applying a tension to the deformable part.   The method according to claim 1, further comprising an adhesion step of spray-applying a moisture-resistant adhesive to the structural part and the deformable part.   The method according to claim 1, further comprising the step of defining an adhesive application area on the structural part.   The method according to claim 1, wherein the structural part is made of leather.   It is an assembling method using at least two types of structural parts and deformation parts, and at least one of the structural parts and deformation parts is formed in advance by the method according to any one of claims 1 to 7. Assembling method characterized by. A system for manufacturing a three-dimensional shape of a leather bag or a similar item by assembling a structural part and a deformable part having mutually different elastic characteristics, the system comprising the following means:
Means for applying tension to a deformed part having relatively higher elastic properties and maintaining the tension for a predetermined time;
Means for adhering a structural part having a relatively lower elastic property to the deformed part under tension;
Means for releasing a tension applied to the deformable part and obtaining a desired three-dimensional shape in a curved state so that the structural part is located on the convex side and the deformable part is located on the concave side.   10. The system according to claim 9, further comprising means for cutting at least one of the two types of structural parts and deformed parts used for manufacturing a three-dimensional shape.   10. The system according to claim 9, further comprising means for cutting at least one of the two types of structural parts and the deformed parts before applying tension to the deformed parts.   The system according to claim 9, wherein the structural part is made of leather.   A method of assembling a three-dimensional shape using at least two types of structural parts, wherein at least one of the structural parts is pre-formed by the system according to any one of claims 9 to 12. Assembling method characterized.   A leather product manufactured by two kinds of assembled parts having at least part of elastic properties different from each other, wherein one of the two kinds of assembled parts is a deformed part having relatively higher elastic characteristics. The other one of the two types of assembly parts is a structural part having relatively lower elastic properties, and both the deformed part and the structural part are made of leather, and the deformed part is tensioned for a predetermined time. And applying stress to the structural part, and then releasing the tension applied to the deformed part so that the structural part is curved so that the deformed part is positioned on the convex side and the deformed part is positioned on the concave side. A leather product characterized by having a three-dimensional shape formed.   A bag manufactured by two kinds of assembly parts at least partially having different elastic characteristics, wherein one of the two kinds of assembly parts is a deformed part having relatively higher elastic characteristics; The other one of the two types of assembly parts is a structural part having relatively lower elastic properties, and both the deformed part and the structural part are made of leather, and the deformed part is tensioned for a predetermined time. Applying stress to the structural part, and then releasing the tension applied to the deformed part so that the structural part is curved so that the deformed part is positioned on the convex side and the deformed part is positioned on the concave side. A bag formed with a three-dimensional shape.

Images