EP2303765A1 - Method and system for producing three-dimensional shapes from assembled parts having varying elastic properties - Google Patents

Method and system for producing three-dimensional shapes from assembled parts having varying elastic properties

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Publication number
EP2303765A1
EP2303765A1 EP09797561A EP09797561A EP2303765A1 EP 2303765 A1 EP2303765 A1 EP 2303765A1 EP 09797561 A EP09797561 A EP 09797561A EP 09797561 A EP09797561 A EP 09797561A EP 2303765 A1 EP2303765 A1 EP 2303765A1
Authority
EP
European Patent Office
Prior art keywords
deforming
structuring
parts
piece
tension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09797561A
Other languages
German (de)
French (fr)
Other versions
EP2303765B1 (en
Inventor
Marie René Nicole DOGNIN Luc
Aminé Abderrazak MAHIOUT Rafik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scalera Sarl
Original Assignee
Scalera Sarl
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Publication date
Application filed by Scalera Sarl filed Critical Scalera Sarl
Publication of EP2303765A1 publication Critical patent/EP2303765A1/en
Application granted granted Critical
Publication of EP2303765B1 publication Critical patent/EP2303765B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B68—SADDLERY; UPHOLSTERY
    • B68F—MAKING ARTICLES FROM LEATHER, CANVAS, OR THE LIKE
    • B68F1/00—Making articles from leather, canvas, or the like
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C3/00—Flexible luggage; Handbags
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C3/00—Flexible luggage; Handbags
    • A45C3/001—Flexible materials therefor
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C5/00—Rigid or semi-rigid luggage
    • A45C5/03—Suitcases
    • A45C2005/032—Suitcases semi-rigid, i.e. resistant against deformation and resilient, e.g. with a resilient frame

Definitions

  • the present invention relates to a method for producing a three-dimensional shape from assembled parts having distinct elasticity characteristics. It also relates to a system implementing this method, as well as leather goods, such as bags and more generally three-dimensional objects made from this process.
  • the invention applies particularly, but not exclusively, to leather goods or three-dimensional objects at least partly made of leather.
  • the field of the invention is that of the industry of processing substantially flat materials for the purpose of making three-dimensional shapes.
  • the term "form" is to be considered not only in the proper sense (geometrical form), but it also designates, figuratively, an object or a set having the evoked geometrical properties (producing a "three-dimensional shape”) .
  • the object of the present invention is to provide a method for obtaining a three-dimensional shape, which does not imply the use of specific structural parts or armature.
  • This object is achieved with a method for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics, comprising the following steps:
  • the method according to the invention it is possible to obtain a three-dimensional equilibrium shape having both strength and flexibility characteristics.
  • the outfit is due to the self-supporting properties of the structuring piece, which is the body of the three-dimensional shape.
  • the structuring piece however has a certain flexibility, and lends itself to deformations, mainly in flexion.
  • structural and deforming parts made in webs or skins are used in the process, having reduced thicknesses relative to their other dimensions.
  • the method further comprises a step of cutting at least one of the two pieces after obtaining the three-dimensional shape.
  • the method further comprises a step of cutting at least one of the two parts prior to the tensioning of the deforming part.
  • the bonding step comprises spraying an adhesive having characteristics of resistance to moisture, on the structuring part and on the deforming part.
  • the invention also relates to a method of assembling at least two structural parts, previously shaped by a method having all or part of the preceding features.
  • a system for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics comprising:
  • the system according to the invention further comprises means for cutting at least one of the two pieces after obtaining the three-dimensional shape.
  • the system according to the invention further comprises means for cutting at least one of the two parts prior to the tensioning of the deforming part.
  • the system uses a structuring piece of leather.
  • the invention also relates to an assembly system of at least two structural parts, comprising means for assembling structural parts previously shaped by a system having all or part of the preceding features.
  • an article of leather goods such as a bag, at least a part of which is made from an assembly of a deforming piece, and a structuring piece, in particular leather, and shaped three-dimensionally by a method having all or part of the features detailed above.
  • a three-dimensional object at least a part of which is made from an assembly of a part deforming, and a structuring piece, in particular leather, and formatted three-dimensionally by a method having all or part of the features detailed above.
  • FIG. 1 illustrates the different steps of the embodiment method according to the invention.
  • FIG. 2 is a sectional view of the complex envelope obtained with the method according to the invention.
  • the structuring piece can typically be leather.
  • This structuring part is particularly sought for properties of mechanical strength and rigidity, essentially in tension / compression in the plane of its surface (when flat) or in the directions tangent thereto.
  • the structural part also resists deformation under the effect of stresses exerted perpendicularly to its surface.
  • this structural part it is sought for this structural part a relatively high bending ability.
  • the structuring part thus has combined qualities of transverse mechanical strength and flexibility of the material.
  • a deforming piece 1 was prepared and cut such as "Bengaline Lycra®” or elastane®-based. This piece deforming will form a lining, which may have been woven with decorative or fancy patterns.
  • a first step (I) the deforming part 1 is cut beforehand according to a predetermined template according to the desired three-dimensional shape, that is to say as a function of the deformation that it will cause on the structuring part.
  • the deforming part 1 is then placed in a tensioning machine comprising two mechanical parts 10, 11 in which are inserted and locked the edges of the part 1 which is held in tension with a tension force F determined according to the characteristics of the deforming part used (stage II) and in particular its elasticity.
  • This tensioning force F must ensure a tension lower than the breaking force of the deforming part.
  • One of the faces of the deforming part 1 is then subjected to a spray application of glue by means of a suitable equipment 12 arranged facing the deforming part 1 (step III).
  • the adhesive used is preferably a strong adhesive and having a minimum sensitivity to environmental conditions and in particular humidity levels and temperature variations. It must not be retractable with water and heat; It may be Neoprene® or equivalent, but should preferably be environmentally and health friendly.
  • a structuring piece 2 made of a material which is typically leather or a similar material has been prepared and cut. This material will constitute both the body and the outer shell of the three-dimensional shape.
  • the structuring part is subjected (step IV) on one of these faces intended to be applied to the deforming part, to a glue application identical to that used to glue the deforming part 1.
  • the application of the glue is preferably performed on the so-called "velvet" side.
  • step V The deforming part 1 and the structuring part 2 previously glued are then superimposed and glued (step V), the deforming part 1 is always maintained in tension (step V).
  • step VI the tension force F is removed and the complex piece 1 + 2 thus produced is released, which instantly takes on a three-dimensional curved shape (step VI).
  • step VI Being freed from the tension force F, the deforming piece 1 which was previously stretched retracts to return to its nominal shape. However, it does not find exactly its initial shape given the resistance that the structural part 2 sets against it.
  • the curvature of the complex part 1 + 2 is induced by the difference of the tension forces exerted respectively on the structuring part 2 of rigid feature, and on the deforming piece 1 of elastic characteristic, and the fact that the two pieces form layers 1.2 firmly bonded to each other.
  • the curved shape is such that the structuring part 2 is located on the convex side, while the deforming part is located on the concave side.
  • the structuring piece plays a role of spring, when it works in bending.
  • This complex piece 1 + 2 is then completed (step VII) by assembling other structural parts.
  • This assembly is carried out by known techniques, such as sewing, gluing, etc.
  • the structural part 2 is leather
  • Accessories such as handles 21 and closures are then mounted on the bag 20.
  • the production steps that have just been described can be automated from current industrial manufacturing techniques.
  • the various equipment used for cutting, tensioning, gluing, bonding layers, and assembly can be provided with control means / numerical control and if necessary robotic.
  • the material used for the deforming part such as fabric, can be a standardized material, which allows a certainty as to the result, that is to say the precise obtaining of the desired three-dimensional shape.
  • the method is suitable not only for small but also for large areas of structuring and deforming parts.
  • the surface is actually a determining factor of the implementation.
  • the bag 20 thus obtained then has a permanent three-dimensional shape without the need to include specific stiffening or holding parts to form a structure or frame.
  • each of the structuring and deforming parts provides three functions: a first function is mechanical, in terms of resistance (for the structuring part) and of retraction (for the deforming part), in order to obtain the desired three-dimensional shape.
  • a second function is to jointly form an envelope for a container (wall of the bag).
  • a third function is to constitute the style (made visual, tactile) outside or inside the bag. It is remarkable that these three functions are assured only by two pieces contiguous to one another.
  • the process for producing three-dimensional shapes could be implemented outside the field of leather goods, to produce objects for various uses or for industrial creations.
  • the materials used may differ substantially from those described, provided that the materials of the two assembled pieces have distinct elasticity characteristics.

Abstract

Method for producing a three-dimensional shape from two assembled parts having varying elastic properties, characterized in that it comprises the following steps: applying steady tension to the part, termed the deforming part (1), which has the highest elastic properties; bonding the part termed the structural part (2), which has the lowest elastic properties, to the tensioned deforming part; and removing the tension from the deforming part, which then applies stresses to the structural part, in such a way as to deform the latter and create the desired three-dimensional shape.

Description

« Procédé et système pour produire des formes tridimensionnelles à partir de pièces assemblées ayant des caractéristiques d'élasticités distinctes » "Method and system for producing three-dimensional shapes from assembled parts having distinct elasticity characteristics"
La présente invention concerne un procédé pour produire une forme tridimensionnelle à partir de pièces assemblées ayant des caractéristiques d'élasticités distinctes. Elle vise également un système mettant en œuvre ce procédé, ainsi que des articles de maroquinerie, tels que des sacs et plus généralement des objets tridimensionnels réalisés à partir de ce procédé. L'invention s'applique particulièrement, mais non exclusivement, aux articles de maroquinerie ou objets tridimensionnels au moins en partie réalisés en cuir.The present invention relates to a method for producing a three-dimensional shape from assembled parts having distinct elasticity characteristics. It also relates to a system implementing this method, as well as leather goods, such as bags and more generally three-dimensional objects made from this process. The invention applies particularly, but not exclusively, to leather goods or three-dimensional objects at least partly made of leather.
Le domaine de l'invention est celui de l'industrie de la transformation de matériaux sensiblement plats aux fins de réaliser des formes tridimensionnelles. Dans la présente demande, le terme « forme » est à considérer non seulement au sens propre (forme géométrique), mais il désigne également, de manière figurée, un objet ou un ensemble ayant les propriétés géométriques évoquées (produire une « forme tridimensionnelle »).The field of the invention is that of the industry of processing substantially flat materials for the purpose of making three-dimensional shapes. In the present application, the term "form" is to be considered not only in the proper sense (geometrical form), but it also designates, figuratively, an object or a set having the evoked geometrical properties (producing a "three-dimensional shape") .
Considérons le domaine de la maroquinerie, qui nous intéresse particulièrement. Actuellement, lorsqu'un maroquinier souhaite réaliser un sac en cuir présentant une forme tridimensionnelle, il est actuellement contraint d'utiliser des pièces spécifiques de structure ou d'armature, pour constituer une sorte de charpente du sac sur la base de laquelle des pièces de cuir vont être assemblées et maintenues selon une forme souhaitée. Les pièces de structure ou d'armature conditionnent la forme définitive du sac. Il en résulte une complexité de réalisation (multiplicité des éléments, assemblage, etc.) et donc des surcoûts. Par ailleurs, une fois le sac assemblé et mis en forme, il est peu aisé d'obtenir des variations de formes, s'écartant légèrement d'une forme nominale prédéfinie, en raison de la présence des pièces de structure ou d'armature qui s'oppose aux déformations. Or il peut être utile de pouvoir aisément déformer un sac ayant une forme nominale prédéfinie, pour des raisons d'encombrement, de rangement etc., tout en lui conservant la possibilité de reprendre sa forme nominale initiale. Le but de la présente invention est de proposer un procédé permettant d'obtenir une forme tridimensionnelle, qui n'implique pas l'emploi de pièces de structure ou d'armature spécifiques.Consider the field of leather goods, which interests us particularly. Currently, when a leatherworker wishes to make a leather bag with a three-dimensional shape, he is currently forced to use specific pieces of structure or frame, to form a sort of framework of the bag on the basis of which pieces of leather. leather will be assembled and held in a desired shape. The structural or reinforcing parts condition the final shape of the bag. This results in a complexity of realization (multiplicity of elements, assembly, etc.) and therefore additional costs. Moreover, once the bag is assembled and shaped, it is not easy to obtain shape variations, slightly deviating from a predefined nominal shape, due to the presence of structural or reinforcing parts which opposes the deformations. Or it may be useful to easily deform a bag having a predefined nominal shape, for reasons of space, storage etc., while retaining the ability to resume its original nominal form. The object of the present invention is to provide a method for obtaining a three-dimensional shape, which does not imply the use of specific structural parts or armature.
Cet objectif est atteint avec un procédé pour produire une forme tridimensionnelle à partir de deux pièces assemblées ayant des caractéristiques d'élasticité distinctes, comprenant les étapes suivantes :This object is achieved with a method for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics, comprising the following steps:
- une mise en tension et un maintien en tension de la pièce, dite déformante, ayant les caractéristiques d'élasticité les plus élevées,a tensioning and a maintenance in tension of the piece, said deforming, having the highest characteristics of elasticity,
- un collage de la pièce, dite structurante, ayant les caractéristiques d'élasticité les plus faibles, sur la pièce déformante maintenue en tension,a bonding of the so-called structuring part, having the weakest elastic characteristics, on the deforming part held in tension,
- une suppression de la tension exercée sur la pièce déformante, qui exerce alors des contraintes sur la pièce structurante, de manière à déformer cette dernière et à obtenir la forme tridimensionnelle souhaitée.- A removal of the tension exerted on the deforming part, which then exerts stresses on the structuring part, so as to deform the latter and to obtain the desired three-dimensional shape.
Ainsi, avec le procédé selon l'invention, on peut obtenir une forme tridimensionnelle d'équilibre présentant à la fois des caractéristiques de tenue et de souplesse. La tenue est due aux propriétés auto-porteuses de la pièce structurante, qui constitue le corps même de la forme tridimensionnelle. La pièce structurante présente toutefois une certaine souplesse, et se prête à des déformations, essentiellement en flexion. Dans une version particulière de l'invention, on utilise dans le procédé des pièces structurantes et déformantes réalisées dans des nappes ou des peaux, ayant des épaisseurs réduites relativement à leurs autres dimensions.Thus, with the method according to the invention, it is possible to obtain a three-dimensional equilibrium shape having both strength and flexibility characteristics. The outfit is due to the self-supporting properties of the structuring piece, which is the body of the three-dimensional shape. The structuring piece however has a certain flexibility, and lends itself to deformations, mainly in flexion. In a particular version of the invention, structural and deforming parts made in webs or skins are used in the process, having reduced thicknesses relative to their other dimensions.
Dans une autre version de l'invention, le procédé comprend en outre une étape de découpe de l'une au moins des deux pièces après obtention de la forme tridimensionnelle.In another version of the invention, the method further comprises a step of cutting at least one of the two pieces after obtaining the three-dimensional shape.
Dans une autre version de l'invention, le procédé comprend en outre une étape de découpe de l'une au moins des deux pièces préalablement à la mise en tension de la pièce déformante. L'étape de collage comprend une pulvérisation d'une colle présentant des caractéristiques de résistance à l'humidité, sur la pièce structurante et sur la pièce déformante.In another version of the invention, the method further comprises a step of cutting at least one of the two parts prior to the tensioning of the deforming part. The bonding step comprises spraying an adhesive having characteristics of resistance to moisture, on the structuring part and on the deforming part.
On peut avantageusement prévoir une délimitation de zones de la pièce structurante à encoller. On peut utiliser dans le procédé selon l'invention une pièce structurante en cuir.It is advantageous to provide a zone delimitation of the structuring part to be glued. In the process according to the invention, it is possible to use a structuring piece of leather.
L'invention a également pour objet un procédé d'assemblage d'au moins deux pièces structurantes, préalablement mises en forme par un procédé ayant tout ou partie des caractéristiques précédentes.The invention also relates to a method of assembling at least two structural parts, previously shaped by a method having all or part of the preceding features.
Suivant un autre aspect de l'invention, il est proposé un système pour produire une forme tridimensionnelle à partir de deux pièces assemblées ayant des caractéristiques d'élasticité distinctes, le système comprenant :According to another aspect of the invention, there is provided a system for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics, the system comprising:
- des moyens pour mettre en tension la pièce, dite déformante, ayant les caractéristiques d'élasticité les plus élevées et pour maintenir cette tension pendant une durée de tension déterminée,means for tensioning the so-called deforming part having the highest elasticity characteristics and for maintaining this tension during a determined tensioning period,
- des moyens pour coller la pièce, dite structurante, ayant les caractéristiques d'élasticité les plus faibles, sur la pièce déformante maintenue en tension, la désactivation des moyens de maintien en tension de la pièce déformante permettant de produire une forme tridimensionnelle.- Means for bonding the so-called structuring piece, having the lowest elasticity characteristics, on the deforming part held in tension, the deactivation of the tension holding means of the deforming part for producing a three-dimensional shape.
Le système selon l'invention comprend en outre des moyens pour découper au moins l'une des deux pièces après obtention de la forme tridimensionnelle. Le système selon l'invention comprend en outre des moyens pour découper au moins l'une des deux pièces préalablement à la mise en tension de la pièce déformante.The system according to the invention further comprises means for cutting at least one of the two pieces after obtaining the three-dimensional shape. The system according to the invention further comprises means for cutting at least one of the two parts prior to the tensioning of the deforming part.
Selon l'invention, on utilise dans le système une pièce structurante en cuir. L'invention a encore pour objet un système d'assemblage d'au moins deux pièces structurantes, comprenant des moyens pour assembler des pièces structurantes préalablement mise en forme par un système ayant tout ou partie des caractéristiques précédentes.According to the invention, the system uses a structuring piece of leather. The invention also relates to an assembly system of at least two structural parts, comprising means for assembling structural parts previously shaped by a system having all or part of the preceding features.
Suivant encore un autre aspect de l'invention, il est proposé un article de maroquinerie, tel qu'un sac, dont au moins une partie est réalisée à partir d'un assemblage d'une pièce déformante, et d'une pièce structurante, notamment en cuir, et mise en forme de manière tridimensionnelle par un procédé ayant tout ou partie des caractéristiques détaillées précédemment. Selon l'invention, il est également proposé un objet tridimensionnel, dont au moins une partie est réalisée à partir d'un assemblage d'une pièce déformante, et d'une pièce structurante, notamment en cuir, et mise en forme de manière tridimensionnelle par un procédé ayant tout ou partie des caractéristiques détaillées précédemment.According to yet another aspect of the invention, there is provided an article of leather goods, such as a bag, at least a part of which is made from an assembly of a deforming piece, and a structuring piece, in particular leather, and shaped three-dimensionally by a method having all or part of the features detailed above. According to the invention, it is also proposed a three-dimensional object, at least a part of which is made from an assembly of a part deforming, and a structuring piece, in particular leather, and formatted three-dimensionally by a method having all or part of the features detailed above.
D'autres avantages et caractéristiques de l'invention apparaîtront à l'examen de la description détaillée d'un mode de mise en œuvre nullement limitatif, et des dessins annexés sur lesquels :Other advantages and features of the invention will appear on examining the detailed description of a non-limiting embodiment, and the attached drawings in which:
- la figure 1 illustre les différentes étapes du procédé de réalisation selon l'invention ; etFIG. 1 illustrates the different steps of the embodiment method according to the invention; and
- la figure 2 est une vue en coupe de l'enveloppe complexe obtenue avec le procédé selon l'invention.FIG. 2 is a sectional view of the complex envelope obtained with the method according to the invention.
On va maintenant décrire, en référence à la figure 1, les différentes étapes du procédé de production selon l'invention, en même temps que les moyens techniques mis en œuvre dans ce procédé.We will now describe, with reference to Figure 1, the various steps of the production process according to the invention, along with the technical means implemented in this process.
Sont destinées à être assemblées dans le procédé suivant l'invention, deux pièces formant des peaux, nappes ou couches, en ce sens qu'elles présentent une épaisseur réduite relativement à leurs autres dimensions. Les deux pièces ont des caractéristiques d'élasticité distinctes. On nommera « pièce déformante » la pièce ayant les caractéristiques d'élasticité les plus grandes, et « pièces structurante » la pièce ayant les caractéristiques d'élasticité les plus faibles, en raison de leur fonction respective dans l'assemblage à réaliser.Are intended to be assembled in the process according to the invention, two pieces forming skins, sheets or layers, in that they have a reduced thickness relative to their other dimensions. Both pieces have distinct elasticity characteristics. The piece having the highest elasticity characteristics and the "structuring part" the piece having the weakest elastic characteristics, because of their respective function in the assembly to be produced, will be called "deforming part".
La pièce structurante peut typiquement être en cuir. On recherche particulièrement pour cette pièce structurante des propriétés de tenue mécanique et de rigidité, essentiellement en traction / compression dans le plan de sa surface (lorsqu'elle est à plat) ou dans les directions tangentes à celle-ci. La pièce structurante résiste également à la déformation sous l'effet de contraintes exercées perpendiculairement à sa surface. En revanche, on recherche pour cette pièce structurante une relativement grande aptitude à la flexion. La pièce structurante présente ainsi des qualités combinées de résistance mécanique transversale et de souplesse du matériau. Ces notions de tenue mécanique, de résistance et de rigidité, sont à considérer de manière relative à la pièce déformante, qui présente en comparaison des caractéristiques d'élasticité supérieures à la pièce structurante.The structuring piece can typically be leather. This structuring part is particularly sought for properties of mechanical strength and rigidity, essentially in tension / compression in the plane of its surface (when flat) or in the directions tangent thereto. The structural part also resists deformation under the effect of stresses exerted perpendicularly to its surface. On the other hand, it is sought for this structural part a relatively high bending ability. The structuring part thus has combined qualities of transverse mechanical strength and flexibility of the material. These notions of mechanical strength, strength and rigidity, are to be considered relatively to the deforming part, which has in comparison with the characteristics of elasticity greater than the structuring part.
On a tout d'abord préparé et découpé une pièce déformante 1 telles que du « Bengaline Lycra® » ou à base d'élastane®. Cette pièce déformante constituera une doublure, qui peut avoir été tissée avec des motifs décoratifs ou de fantaisie.Firstly, a deforming piece 1 was prepared and cut such as "Bengaline Lycra®" or elastane®-based. This piece deforming will form a lining, which may have been woven with decorative or fancy patterns.
Dans une première étape (I), la pièce déformante 1 est préalablement découpée selon un gabarit prédéterminé en fonction de la forme tridimensionnelle recherchée, c'est-à-dire en fonction de la déformation qu'elle devra provoquer sur la pièce structurante.In a first step (I), the deforming part 1 is cut beforehand according to a predetermined template according to the desired three-dimensional shape, that is to say as a function of the deformation that it will cause on the structuring part.
La pièce déformante 1 est ensuite disposée dans une machine de mise en tension comportant deux pièces mécaniques 10, 11 dans lesquelles sont insérée et bloqués des bords de la pièce 1 qui est maintenue en tension avec une force de tension F déterminée en fonction des caractéristiques de la pièce déformante utilisée (étape II) et notamment de son élasticité.The deforming part 1 is then placed in a tensioning machine comprising two mechanical parts 10, 11 in which are inserted and locked the edges of the part 1 which is held in tension with a tension force F determined according to the characteristics of the deforming part used (stage II) and in particular its elasticity.
Cette force de tension F doit assurer une tension inférieure à la force de rupture de la pièce déformante. L'une des faces de la pièce déformante 1 est ensuite soumise à une application de colle par pulvérisation au moyen d'un équipement adapté 12 disposée face à la pièce déformante 1 (étape III). La colle utilisée est de préférence une colle puissante et présentant une sensibilité minimale aux conditions environnementales et en particulier aux taux d'humidité et aux variations de température. Elle ne doit pas être rétractable à l'eau et à la chaleur ; Elle peut être de type Néoprène® ou équivalent, mais devrait être de préférence respectueuse de l'environnement et de la santé.This tensioning force F must ensure a tension lower than the breaking force of the deforming part. One of the faces of the deforming part 1 is then subjected to a spray application of glue by means of a suitable equipment 12 arranged facing the deforming part 1 (step III). The adhesive used is preferably a strong adhesive and having a minimum sensitivity to environmental conditions and in particular humidity levels and temperature variations. It must not be retractable with water and heat; It may be Neoprene® or equivalent, but should preferably be environmentally and health friendly.
Dans le même temps ou préalablement, on a préparé et découpé une pièce structurante 2 réalisée dans un matériau qui est typiquement du cuir ou un matériau analogue. Ce matériau constituera à la fois le corps et l'enveloppe extérieure de la forme tridimensionnelle. La pièce structurante est soumise (étape IV) sur l'une de ces faces destinées à être appliquée sur la pièce déformante, à une application de colle identique à celle utilisée pour encoller la pièce déformante 1. Dans le cas où la pièce structurante 2 est du cuir, l'application de la colle est réalisée de préférence sur la face dite « velours ».At the same time or beforehand, a structuring piece 2 made of a material which is typically leather or a similar material has been prepared and cut. This material will constitute both the body and the outer shell of the three-dimensional shape. The structuring part is subjected (step IV) on one of these faces intended to be applied to the deforming part, to a glue application identical to that used to glue the deforming part 1. In the case where the structuring part 2 is leather, the application of the glue is preferably performed on the so-called "velvet" side.
La pièce déformante 1 et la pièce structurante 2 préalablement encollées sont ensuite superposées et collées (étape V), la pièce déformante 1 étant toujours maintenue en tension (étape V). Une fois que le temps de prise de la colle s'est écoulé, on supprime la force de tension F et on libère la pièce complexe 1+2 ainsi réalisée qui prend instantanément une forme galbée tridimensionnelle (étape VI). Etant affranchie de la force de tension F, la pièce déformante 1 qui était préalablement étirée se rétracte pour revenir vers sa forme nominale. Elle ne retrouve toutefois pas exactement sa forme initiale compte tenu de la résistance que lui oppose la pièce structurante 2. La courbure de la pièce complexe 1+2 est induite par la différence des forces de tension s'exerçant respectivement sur la pièce structurante 2 de caractéristique rigide, et sur la pièce déformante 1 de caractéristique élastique, et le fait que les deux pièces forment des couches 1,2 solidement collées l'une à l'autre. Compte tenu de la contrainte exercée par la pièce déformante 1 sur la pièce structurante 2, la forme galbée est telle que la pièce structurante 2 est située du côté convexe, tandis que la pièce déformante, est située du côté concave.The deforming part 1 and the structuring part 2 previously glued are then superimposed and glued (step V), the deforming part 1 is always maintained in tension (step V). Once the setting time of the glue has elapsed, the tension force F is removed and the complex piece 1 + 2 thus produced is released, which instantly takes on a three-dimensional curved shape (step VI). Being freed from the tension force F, the deforming piece 1 which was previously stretched retracts to return to its nominal shape. However, it does not find exactly its initial shape given the resistance that the structural part 2 sets against it. The curvature of the complex part 1 + 2 is induced by the difference of the tension forces exerted respectively on the structuring part 2 of rigid feature, and on the deforming piece 1 of elastic characteristic, and the fact that the two pieces form layers 1.2 firmly bonded to each other. Given the stress exerted by the deforming part 1 on the structuring part 2, the curved shape is such that the structuring part 2 is located on the convex side, while the deforming part is located on the concave side.
On notera par ailleurs, que la pièce structurante joue un rôle de ressort, lorsqu'elle travaille en flexion.Note also that the structuring piece plays a role of spring, when it works in bending.
Cette pièce complexe 1+2 est ensuite complétée (étape VII) par l'assemblage d'autres pièces structurantes. Cet assemblage est réalisé par des techniques connues, telles que par couture, collage etc. Dans l'application particulière de la maroquinerie, où la pièce structurante 2 est en cuir, celle-ci prend par exemple une forme générale cylindrique, qui est complétée par d'autres pièces de cuir 22 fermant les extrémités du cylindre, de manière à constituer un sac 20. Des accessoires telles que des poignées 21 et des fermetures sont ensuite montés sur le sac 20.This complex piece 1 + 2 is then completed (step VII) by assembling other structural parts. This assembly is carried out by known techniques, such as sewing, gluing, etc. In the particular application of leather goods, where the structural part 2 is leather, it takes for example a generally cylindrical shape, which is completed by other pieces of leather 22 closing the ends of the cylinder, so as to constitute a bag 20. Accessories such as handles 21 and closures are then mounted on the bag 20.
Les étapes de réalisation qui viennent d'être décrites peuvent être automatisées à partir des techniques actuelles de fabrication industrielle. Les différents équipements utilisés pour la découpe, la mise en tension, l'encollage, le collage des couches, et l'assemblage, peuvent être pourvus de moyens de contrôle/commande numérique et au besoin robotisés. En particulier le matériau employé pour la pièce déformante, tel que du tissu, peut être un matériau standardisé, ce qui permet une certitude quant au résultat, c'est-à-dire l'obtention précise de la forme tridimensionnelle recherchée. On notera que le procédé est adapté non seulement à des petites mais également à des grandes surfaces de pièces structurante et déformante. La surface n'est en réalité par un facteur déterminant de la mise en œuvre. Dans l'application précitée à un article de maroquinerie, le sac 20 ainsi obtenu présente alors une forme tridimensionnelle permanente sans avoir nécessité d'inclure des pièces spécifiques de rigidification ou de maintien pour constituer une structure ou une armature. En référence à la figure 2, le maintien est réalisé directement par la couche de cuir 2 (pièce structurante) dont la fleur 23 constitue la face extérieure de l'enveloppe. La déformation a été provoquée par la couche de tissu 1 à propriétés élastiques (pièce déformante) dont une face va constituer la doublure du sac, une couche de colle 3 ayant été appliquée entre le velours de la couche de cuir 2 et la face en vis-à-vis de la couche de tissu 1. Un avantage de l'invention réside dans le fait que chacune des pièces structurante et déformante assure trois fonctions : une première fonction est mécanique, en terme de résistance (pour la pièce structurante) et de rétraction (pour la pièce déformante), afin d'obtenir la forme tridimensionnelle souhaitée. Une seconde fonction est de former conjointement une enveloppe pour un contenant (paroi du sac). Une troisième fonction est de constituer le style (rendu visuel, tactile) extérieur ou intérieur du sac. Il est remarquable que ces trois fonctions soient assurées uniquement par deux pièces accolées l'une à l'autre.The production steps that have just been described can be automated from current industrial manufacturing techniques. The various equipment used for cutting, tensioning, gluing, bonding layers, and assembly, can be provided with control means / numerical control and if necessary robotic. In particular the material used for the deforming part, such as fabric, can be a standardized material, which allows a certainty as to the result, that is to say the precise obtaining of the desired three-dimensional shape. It will be noted that the method is suitable not only for small but also for large areas of structuring and deforming parts. The surface is actually a determining factor of the implementation. In the aforementioned application to a leather article, the bag 20 thus obtained then has a permanent three-dimensional shape without the need to include specific stiffening or holding parts to form a structure or frame. Referring to Figure 2, the maintenance is achieved directly by the leather layer 2 (structuring part) whose flower 23 is the outer face of the envelope. The deformation was caused by the fabric layer 1 with elastic properties (deforming part), one side of which will constitute the lining of the bag, a layer of glue 3 having been applied between the pile of the leather layer 2 and the facing face. a benefit of the invention lies in the fact that each of the structuring and deforming parts provides three functions: a first function is mechanical, in terms of resistance (for the structuring part) and of retraction (for the deforming part), in order to obtain the desired three-dimensional shape. A second function is to jointly form an envelope for a container (wall of the bag). A third function is to constitute the style (made visual, tactile) outside or inside the bag. It is remarkable that these three functions are assured only by two pieces contiguous to one another.
Bien sûr, l'invention n'est pas limitée aux exemples qui viennent d'être décrits et de nombreux aménagements peuvent être apportés à ces exemples sans sortir du cadre de l'invention.Of course, the invention is not limited to the examples that have just been described and many adjustments can be made to these examples without departing from the scope of the invention.
En particulier, le procédé de production de formes tridimensionnelles pourrait être mis en œuvre hors du domaine de la maroquinerie, pour réaliser des objets à usage divers ou à vocation de créations industrielles. Les matériaux employés peuvent différer sensiblement de ceux décrits, pourvu que les matériaux des deux pièces assemblées présentes des caractéristiques d'élasticité distinctes. In particular, the process for producing three-dimensional shapes could be implemented outside the field of leather goods, to produce objects for various uses or for industrial creations. The materials used may differ substantially from those described, provided that the materials of the two assembled pieces have distinct elasticity characteristics.

Claims

REVENDICATIONS
1. Procédé pour produire une forme tridimensionnelle à partir de deux pièces assemblées ayant des caractéristiques d'élasticité distinctes, caractérisé en ce qu'il comprend les étapes suivantes :A method for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics, characterized in that it comprises the following steps:
- une mise en tension et un maintien en tension de la pièce, dite déformante, ayant les caractéristiques d'élasticité les plus élevées,a tensioning and a maintenance in tension of the piece, said deforming, having the highest characteristics of elasticity,
- un collage de la pièce, dite structurante, ayant les caractéristiques d'élasticité les plus faibles, sur la pièce déformante maintenue en tension, - une suppression de la tension exercée sur la pièce déformante, qui exerce alors des contraintes sur la pièce structurante, de manière à déformer cette dernière et à obtenir la forme tridimensionnelle souhaitée.a bonding of the so-called structuring part, having the weakest elastic characteristics, on the deforming part kept in tension, a suppression of the tension exerted on the deforming part, which then exerts stresses on the structuring part, in order to deform the latter and to obtain the desired three-dimensional shape.
2. Procédé selon la revendication 1, caractérisé en ce que les pièces structurantes et déformantes sont réalisées dans des nappes ou peaux, ayant des épaisseurs réduites relativement à leurs autres dimensions.2. Method according to claim 1, characterized in that the structuring and deforming parts are made in sheets or skins, having reduced thicknesses relative to their other dimensions.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il comprend en outre une étape de découpe de l'une au moins des deux pièces après obtention de la forme tridimensionnelle.3. Method according to claim 1 or 2, characterized in that it further comprises a step of cutting at least one of the two parts after obtaining the three-dimensional shape.
4. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'il comprend en outre une étape de découpe de l'une au moins des deux pièces préalablement à la mise en tension de la pièce déformante.4. Method according to claim 1 or 2, characterized in that it further comprises a step of cutting at least one of the two parts prior to the tensioning of the deforming part.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'étape de collage comprend une pulvérisation d'une colle présentant des caractéristiques de résistance à l'humidité, sur la pièce structurante et sur la pièce déformante.5. Method according to one of the preceding claims, characterized in that the bonding step comprises spraying an adhesive having moisture resistance characteristics, on the structural part and on the deforming part.
6. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il comprend en outre une délimitation de zones de la pièce structurante à encoller.6. Method according to one of the preceding claims, characterized in that it further comprises a zone delineation of the structuring part to be glued.
7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pièce structurante est une pièce de cuir. 7. Method according to any one of the preceding claims, characterized in that the structuring part is a piece of leather.
8. Procédé d'assemblage d'au moins deux pièces structurantes, dont l'une au moins a été préalablement mise en forme par un procédé selon l'une quelconque des revendications précédentes.8. A method of assembling at least two structural parts, at least one of which has been previously shaped by a method according to any one of the preceding claims.
9. Système pour produire une forme tridimensionnelle à partir de deux pièces assemblées ayant des caractéristiques d'élasticité distinctes, caractérisé en ce qu'il comprend :9. System for producing a three-dimensional shape from two assembled parts having distinct elasticity characteristics, characterized in that it comprises:
- des moyens pour mettre en tension la pièce, dite déformante, ayant les caractéristiques d'élasticité les plus élevées et pour maintenir cette tension pendant une durée de tension déterminée,means for tensioning the so-called deforming part having the highest elasticity characteristics and for maintaining this tension during a determined tensioning period,
- des moyens pour coller la pièce, dite structurante, ayant les caractéristiques d'élasticité les plus faibles, sur la pièce déformante maintenue en tension, la désactivation des moyens de maintien en tension de la pièce déformante permettant de produire une forme tridimensionnelle.- Means for bonding the so-called structuring piece, having the lowest elasticity characteristics, on the deforming part held in tension, the deactivation of the tension holding means of the deforming part for producing a three-dimensional shape.
10. Système selon la revendication 9, caractérisé en ce qu'il comprend en outre des moyens pour découper au moins l'une des deux pièces après obtention de la forme tridimensionnelle.10. System according to claim 9, characterized in that it further comprises means for cutting at least one of the two parts after obtaining the three-dimensional shape.
11. Système selon la revendication 9, caractérisé en ce qu'il comprend en outre des moyens pour découper au moins l'une des deux pièces préalablement à la mise en tension de la pièce déformante.11. System according to claim 9, characterized in that it further comprises means for cutting at least one of the two parts prior to the tensioning of the deforming part.
12. Système selon l'une quelconque des revendications 9 à 11, caractérisé en ce que la pièce structurante est une pièce de cuir.12. System according to any one of claims 9 to 11, characterized in that the structuring part is a piece of leather.
13. Système d'assemblage d'au moins deux pièces structurantes, comprenant des moyens pour assembler des pièces structurantes dont l'une au moins a été préalablement mise en forme par un système selon l'une quelconque des revendications 9 à 12.13. System for assembling at least two structural parts, comprising means for assembling structural parts, at least one of which has been previously shaped by a system according to any one of claims 9 to 12.
14. Article de maroquinerie, tel qu'un sac, dont au moins une partie est réalisée à partir d'un assemblage d'une pièce déformante, et d'une pièce structurante, notamment en cuir, et mise en forme de manière tridimensionnelle par un procédé selon l'une quelconque des revendications l à 8. 14. A leather article, such as a bag, at least a part of which is made from an assembly of a deforming piece, and a structuring piece, in particular made of leather, and shaped in a three-dimensional manner by a process according to any one of claims 1 to 8.
15. Objet tridimensionnel, dont au moins une partie est réalisée à partir d'un assemblage d'une pièce déformante, et d'une pièce structurante, notamment en cuir, et mise en forme de manière tridimensionnelle par un procédé selon l'une quelconque des revendications 1 à 8. 15. Three-dimensional object, at least a part of which is made from an assembly of a deforming part, and a structuring part, in particular made of leather, and shaped in a three-dimensional manner by a method according to any one of Claims 1 to 8.
EP09797561.9A 2008-06-25 2009-06-25 Method for producing three-dimensional shapes from assembled pieces having distinct elasticity-properties, and leathercraft article Active EP2303765B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0854220A FR2933027B1 (en) 2008-06-25 2008-06-25 METHOD AND SYSTEM FOR PRODUCING THREE - DIMENSIONAL SHAPES FROM ASSEMBLED PARTS HAVING SEPARATE ELASTICITY FEATURES.
PCT/FR2009/000793 WO2010007242A1 (en) 2008-06-25 2009-06-25 Method and system for producing three-dimensional shapes from assembled parts having varying elastic properties

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EP2303765A1 true EP2303765A1 (en) 2011-04-06
EP2303765B1 EP2303765B1 (en) 2018-12-19

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JP (1) JP5527907B2 (en)
KR (1) KR101326021B1 (en)
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KR102016110B1 (en) * 2018-06-15 2019-08-29 김명희 Method for manufacturing a leather bag

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DE641614C (en) * 1936-04-24 1937-02-06 Spielmann & Co G Process for the production of folds and fold patterns on leather for leather goods and other flat materials
GB1277038A (en) * 1969-07-09 1972-06-07 Vladimirsky Nii Sint Smol A method of manufacturing shaped articles from elastic porous materials
FR2415474A2 (en) * 1978-01-25 1979-08-24 Delhome Rene Flexible foam toys with limbs tensioned by an elastic laminate - to avoid use of metal levers or springs internally
JPH0354572Y2 (en) * 1986-05-30 1991-12-03
JPH0546308U (en) * 1991-11-29 1993-06-22 三恵ライトパック株式会社 Carrying bag for small items
IN189366B (en) * 1996-02-12 2003-02-15 Mcneil Ppc Inc
KR200262992Y1 (en) * 2001-07-27 2002-02-02 지. 아이. 씨 상사 주식회사 leather clothes base material
KR200308743Y1 (en) * 2002-12-16 2003-03-26 화인고무(주) The polymer composition sheet, which consist of Natural leather layer and rubber sheet layer
JP2004236875A (en) * 2003-02-06 2004-08-26 Raraya:Kk Bag
FR2888829B1 (en) * 2005-07-22 2007-09-07 Faurecia Interieur Ind Snc METHOD FOR FORMING A LEATHER SKIN

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EP2303765B1 (en) 2018-12-19
CN102083739A (en) 2011-06-01
WO2010007242A4 (en) 2010-03-18
FR2933027B1 (en) 2011-02-18
JP2011525823A (en) 2011-09-29
WO2010007242A1 (en) 2010-01-21
JP5527907B2 (en) 2014-06-25
KR20110040863A (en) 2011-04-20
KR101326021B1 (en) 2013-11-07
FR2933027A1 (en) 2010-01-01

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