JP2011173268A - Method of manufacturing chair member having mesh, and the chair member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method in which chair members such as a back part having mesh fabric or a seat part are easily, neatly and economically molded. <P>SOLUTION: A core mold 2 and a cavity mold 1 constituting a cavity for forming the back part and a frame body of the seat part are provided. An inside face 10 of a mesh pressing mold 3 holding the mesh fabric 9 and having a mold face constituting a part of the cavity 17 is attached to an outer face 11 of the core mold 2, and tension needed for the mesh fabric 9 is imparted by moving the inside face 10 toward the core mold 2. Peripheral edge side of the mesh fabric 9 is drawn out from between the core mold 2 and mesh pressing mold 3 toward the cavity outside. A plastic material is injected into the cavity to insert-mold the mesh fabric. Then, the peripheral edge part protruded from the peripheral edge is cut off. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a chair member such as a back portion or a seat portion having a mesh, and the chair member.

  Many chairs used in offices, halls, halls, etc. have a structure in which cushioning materials are attached to the back and seat, but apart from this type of chair, the back and seat are framed with openings. There is known a chair that is configured in such a manner that an elastic mesh fabric is stretched in the opening. The chair having such a mesh has a light feeling and can realize a comfortable sitting comfort. The following methods are known as methods for installing such a mesh fabric.

  As a widely known configuration, a back frame or a seat frame is formed in a frame body having an opening, and another member in which a mesh fabric is stretched is fitted into the opening (for example, see Patent Document 1). There is. However, this configuration requires a frame, a member for holding the mesh fabric, and a connecting member such as a screw for fixing the frame, requires a large number of parts, requires strength of the frame, and is large and thick. It becomes difficult to obtain economically.

  A configuration is also known in which a mesh fabric made into a drawstring bag shape is covered with a frame portion of a metal frame (see, for example, Patent Document 2). However, in this configuration, since the frame portion must be a metal frame, the degree of freedom of the shape of the frame portion is reduced, and the mesh fabric is sewn in a drawstring bag shape, and the cost is also increased. Further, a structure in which a mesh frame is stretched on a metal frame and formed integrally with plastic by insert molding is also known (for example, see Patent Document 3). Since the frame is a composite material provided in the plastic, there is a problem that it cannot be separated when the product is discarded, and the recyclability is poor.

  As a method that does not cause the above problems, there is also known a method in which only a mesh fabric is integrally formed with a plastic frame portion by injection molding (see, for example, Patent Document 4). In this case, there is also a degree of freedom in design, and since the mesh fabric is inserted and integrally formed with the frame portion, the number of members is small and it can be obtained economically. This method will be described with reference to the molding flow of FIG. 13. For example, an injection molding machine to which a primary injection mold for forming a seat frame is fixed is opened, and the mesh fabric is manually hung on the front surface of the mold. After fixing the periphery with a clip, the mold is closed and a resin material is injected into the mold to perform primary injection molding. When the molded product is taken out from this mold, the mesh fabric is integrated with the resin frame and the periphery protrudes from the frame portion, so trim the excess mesh fabric other than the resin frame portion with a cutter knife, A primary molded product is obtained. Next, the secondary injection mold is fixed to the injection molding machine, the molding machine is opened, the primary molded product is set, and the remaining part of the seat frame is subjected to secondary injection molding. After molding, the secondary molded product taken out from the mold is in a state where the mesh fabric is loose. The reason is that if the mesh fabric is pulled too strongly in the primary molding, the primary molded product is bent or twisted due to the tension and cannot be set in the secondary molding die. Therefore, finally, the mesh fabric is heated to remove the slack of the fabric, and the product is completed in a stretched state such as the back portion and the seat portion. This mesh dough heating machine has an aluminum mold and heats this mold so that the mesh dough is sandwiched and heated, and the mesh dough taken out from the heater shrinks during the cooling process. The sagging disappears due to the action, and it becomes taut.

  In the method of pasting the mesh fabric as described above, since the injection molding process and the heating process are performed twice, the lead time is long and expensive, and the primary molded product cannot be set in the secondary injection mold due to deformation. Is also not economical. In addition, the primary molded product inside the mold is blown by the injection pressure during the secondary injection molding, resulting in a defective appearance, and trimmed fabric fragments (fabric edge material) as foreign matter during the secondary injection molding. In some cases, the appearance may be poor due to mixing, or the mesh fabric may melt during the heating process, resulting in a defective product. Furthermore, in the case of the seat part, because of the secondary molding, a step of several millimeters occurs between the seat frame (upper surface) front edge part of the seat frame and the mesh fabric connecting part, and when seated, the thigh of the seated person is compressed. In some cases, it was uncomfortable.

  A method for producing a mesh fabric and a frame body by insert molding by one injection molding instead of the above method is also known (see, for example, Patent Document 5). In this method, the mesh fabric is brought into contact with the mold surface in a state in which the tension is applied to the outside of the mold by the tension applying mechanism (device) and the necessary tension is applied in the cavity formed by the mold. Alternatively, it is point-contacted or line-contacted and installed so that the peripheral side passes through the edge of the frame member and injection-molded, and then the mesh fabric protruding from the peripheral edge of the frame member is cut off. However, in this method, a tension applying mechanism (device) for pulling the periphery of the mesh fabric outward from the mold must be provided, and the mesh fabric is pulled out from the periphery of the frame member. As shown in FIG. 5, the edge 34 of the mesh fabric 33 cut out by trimming appears at the peripheral edge 32 of the frame member 31 having the opening 30. The peripheral edge 32 may be touched by a hand or a finger when it becomes a seat or a back, and is not good because it feels rough.

Japanese Patent Laying-Open No. 2006-110002 (Claims 1, 3, 3, and 5) JP 2005-103047 A (Claims 1 to 4, FIGS. 1 and 6) Japanese Patent No. 3200409 (Claims 1, 2, 1 and 4) JP 2008-259673 A (paragraph 0016, FIG. 11) JP 2002-240081 (Claim 1, paragraph 0040, FIG. 1, FIG. 3, FIG. 4)

  The problem to be solved by the present invention is to use an insert molding technique in which a mesh fabric is molded integrally with a frame body, and an integral molded product can be obtained by a single injection molding without providing a special tension applying device. It is an object of the present invention to provide a manufacturing method and a chair member that can obtain a chair member having a mesh fabric that is economical and has a beautiful appearance, without causing the peripheral portion to become rough when it becomes a product such as a seat.

  According to the present invention, there is provided a method for manufacturing a chair member in which a mesh fabric is stretched on a frame, having a pair of molds that form a frame-shaped cavity, and holding the mesh fabric on the outside of one mold A frame body in which a mesh presser die is attached, the mesh presser die is moved along the outer side of the die, and a necessary tension is applied to the mesh fabric, and the peripheral side of the mesh fabric is formed by the cavity. The outer periphery of the mesh fabric is injection-molded in a state in which the periphery of the mesh fabric is pulled out from the cavity so as to pass through the back surface of the mesh, and the periphery of the mesh fabric extending from the back surface of the frame body is cut off after the molding The manufacturing method of the chair member which has mesh cloth, and the chair member obtained by it are provided, and the said subject is solved.

  According to the present invention, the pair of molds is a core mold having a projecting mold surface and a mold mold having a concave mold surface, and the mesh presser mold is attached to the core mold, and the mesh presser After moving the mold in the direction of the core mold, the core mold and the mesh presser mold are joined to the cavity mold, and the mesh presser mold is formed with a mold surface that is a part of the mold surface that forms the cavity. A method for manufacturing a chair member having the mesh fabric is provided, and the above-mentioned problems are solved.

  Further, according to the present invention, the mesh fabric extends between a mesh presser mold and a mold to which the mesh presser mold is attached, and the mesh presser mold and the mold to which the mesh presser mold is attached. Provides a method of manufacturing a chair member having the mesh fabric formed with a protrusion and a recess that are engaged when the mesh presser mold is moved in the mold direction, and the above-mentioned problems are solved.

  The present invention is a method of manufacturing a chair member configured as described above, in which a mesh fabric is stretched on a frame, and has a pair of molds that form a frame-shaped cavity, and the outside of one mold A mesh presser mold that holds the mesh fabric is attached to the mesh fabric, and the mesh presser mold is moved along the outside of the mold to apply the necessary tension to the mesh fabric. Injection molding is performed with the peripheral edge of the mesh fabric pulled out from the cavity so that it passes through the middle of the back surface of the formed frame, and the peripheral edge of the mesh fabric extending from the back surface of the frame after molding is cut off. As a result, compared with the conventional method in which two-side molds must be prepared in order to perform primary and secondary injection molding, only one injection mold is required. Cut investment and cut the number of processes Lead time is also shortened, economically obtained by. In addition, the mesh presser is simply moved along the outside of the mold to apply the necessary tension to the mesh fabric, eliminating the need for a special mesh fabric tensioning device and simplifying the device. Is done. In addition, since it is not necessary to weld, sew, or screw it after molding as in the conventional case, the manufacturing process is remarkably simplified, and the rough surface of the edge of the mesh fabric appears on the periphery of the molded product. Since there is no appearance, it has good appearance and feel, and can be formed by a single injection molding, so that it is possible to obtain a chair member such as a back portion and a seat portion having a comfortable mesh seat with few steps between the surfaces of the frame body.

The shaping | molding flowchart which shows one Example of this invention. Explanatory drawing which shows the relationship between a cavity metal mold | die, a core metal mold | die, and a mesh pressing mold. Explanatory drawing of the state which moved the mesh presser type | mold from the state shown in FIG. Explanatory drawing of the state which moved the mesh holding die further from the state shown in FIG. 3, and pulled in mesh fabric. Explanatory drawing of the state which pressed down mesh cloth fully with the mesh press type from the state shown in FIG. Explanatory drawing of the state which moved the core metal mold | die and the mesh pressing mold from the state shown in FIG. Explanatory drawing of the state which carried out the injection molding in the state shown in FIG. Explanatory drawing of the state which opened the type | mold from the state shown in FIG. Explanatory drawing of the state which moved the mesh presser type | mold from the state shown in FIG. Explanatory drawing of the state which fully open | released the type | mold from the state shown in FIG. Explanatory drawing of the state which released the molded article from the state shown in FIG. An example of a product is shown, (A) is a partial perspective view seen from the back, and (B) is a sectional view. The flowchart which shows an example of the conventional manufacturing method. An example of the conventional product is shown, (A) is a partial perspective view seen from the back side, (B) is a sectional view.

  An embodiment of the present invention will be described below with reference to the flowchart shown in FIG. 1 and the explanatory diagrams of FIGS. As shown in FIG. 2, the mold of the injection molding machine according to the present invention includes a mold 1 on the injection nozzle (not shown) side, a core mold 2 on the movable platen side, and a mesh presser mold 3. The core mold 2 and the cavity mold 1 have a mold surface that forms a frame-like cavity having a recessed portion on the back surface, and the core mold 2 has a protruding shape. The mold surface 4 and the concave mold surface 5 and the mesh fabric holding surface 6 are formed, and the cavity mold 1 is formed with the concave mold surface 7 and the mesh fabric pressing surface 8, but these mold surfaces are obtained. It can be formed in various shapes depending on the cross-sectional shape of the frame to be obtained.

  The mesh presser mold 3 is formed in a shape that holds the mesh fabric 9 and can be attached to the outside of the mold nest of the core mold 2, and the inner side surface 10 extends along the outer side surface 11 of the mold in the mold direction. The outer side surface 11 and the inner side surface 10 are formed with gentle inclined surfaces in consideration of the fitting condition. The mesh presser mold 3 is formed with a projecting mold surface 12 and a concave mold surface 13 that are part of the mold surface of the cavity, and the metal mesh so that the mesh fabric can be drawn into the outer surface. Projections 16 such as protrusions and protrusions that engage with recesses 15 such as holes and grooves formed in the stepped portion 14 of the mold 2 are formed. The protrusions may be provided on the mold side and the recesses may be provided on the mesh presser mold side, and the mold surface may be variously formed depending on the cross-sectional shape of the frame to be obtained.

  The mesh fabric 9 can be made of any suitable material suitable as a chair member. In the embodiment shown in the figure, a mesh fabric woven with polyester elastic yarn and polyester yarn is used, covering the front surface of the core mold, and mesh It is formed in a size that can be held between the inner surface 10 of the presser mold 3 and the outer surface 11 of the core mold 2.

  Thus, in order to mold using the molds 1 and 2 and the mesh presser mold 3, first, the front surface of the core mold 2 is covered with the mesh fabric 9 and the mesh fabric 9 is surrounded by the core mold 2. The mesh presser mold 3 is moved along the outer surface 11 in the direction of the core mold 2 while being hung on the outer surface 11 and sandwiched between the inner surface 10 of the mesh presser mold 3 (FIG. 3).

  When the protrusion 16 of the mesh presser mold 3 and the recess 15 of the core mold 2 begin to engage, the mesh fabric 9 is drawn (FIG. 4), and when fully engaged, the mesh fabric 9 is required as a chair member. It is stretched in a surface contact state between the mesh pressing surface 6 of the core mold 2 and the tip of the protruding mold surface 4 with a strong tension (FIG. 5). At this time, the tension of the mesh fabric can be adjusted by adjusting the depths of the recesses 15 and the protrusions 16.

  Thereafter, the core mold 2 and the mesh presser mold 3 are moved in the direction of the mold 1 and attached to the mold 1 and clamped (FIG. 6). The cavity 17 required as a frame is formed by the mold clamping. At this time, the mesh holding mold is formed so that the peripheral side of the mesh fabric 9 passes in the middle of the recessed portion on the back surface of the frame formed by the cavity. 3 and the outer surface 11 of the core mold 2 are drawn out of the cavity 17.

  In this state, the plastic material 18 is injected into the cavity, and the mesh fabric is integrally formed with the frame (FIG. 7). As this plastic material, polypropylene is used in the embodiment shown in the figure, but this plastic material can be made into an appropriate resin in consideration of mesh fabric and the like.

  After the injection molding, the core mold 2 is moved from the mold 1 and opened (FIG. 8), and then the mesh presser mold 3 is moved from the core mold 2 (FIGS. 9 and 10). Then, the molded product 19 is taken out from the mesh presser mold 3 (FIG. 11). Finally, if the peripheral edge of the mesh fabric 9 is trimmed from the molded product 19 with a cutter knife or the like, the mesh fabric 9 is in a desired tension while the edge 22 is hidden in the recess 21 on the back surface of the frame 20. The chair member stretched by is obtained.

  As shown in FIG. 12, the chair member obtained as described above has the mesh fabric 9 stretched at the opening 23 of the frame body 20 having the recessed portion 21 on the back surface with the required strength, and the periphery of the frame body. The part 24 is a good-looking and smooth product in which the end edge 22 of the mesh fabric 9 does not appear, and can constitute an appropriate chair member such as a back part, a seat part or the like.

DESCRIPTION OF SYMBOLS 1 Cavity metal mold | die 2 Core metal mold | die 3 Mesh presser mold | die 9 Mesh cloth 10 Inner side surface of a mesh presser mold | die 11 Outer surface 15 of a core metal mold | die Recess 16 Protrusion 17 Cavity

Claims (7)

  A method of manufacturing a chair member in which a mesh fabric is stretched on a frame body, which has a pair of molds that form a frame-shaped cavity, and a mesh presser mold that holds the mesh fabric is attached to the outside of one mold Then, the mesh presser mold is moved along the outside of the mold to apply the necessary tension to the mesh fabric, and the peripheral side of the mesh fabric passes through the middle of the back surface of the frame formed by the cavity. A chair member having a mesh fabric, wherein the periphery of the mesh fabric is injection-molded with the peripheral side of the mesh fabric being drawn outward from the cavity, and the periphery of the mesh fabric extending from the back surface of the frame body is cut off after molding Manufacturing method.   The pair of molds is a core mold having a projecting mold surface and a cavity mold having a concave mold surface. The mesh presser mold is attached to the core mold, and the mesh presser mold is moved in the direction of the core mold. The method for manufacturing a chair member having a mesh fabric according to claim 1, wherein the core mold and the mesh presser mold are attached to the cavity mold.   The manufacturing method of the chair member which has a mesh fabric of Claim 1 or 2 in which the mold surface used as a part of mold surface which forms a cavity is formed in the said mesh pressing mold.   The said mesh fabric is a manufacturing method of the chair member which has a mesh fabric in any one of the said Claim 1 to 3 extended through between the metal mold | die which the mesh presser die and this mesh presser die attach.   The mesh presser die and a die attached to the mesh presser die have protrusions and recesses that are engaged when the mesh presser die is moved in the direction of the die. Of manufacturing a chair member having a mesh fabric.   A frame having a recess on the back surface and an opening formed by the frame, mesh fabric is stretched in the opening, and the peripheral edge of the mesh fabric is integrated with the frame by insert molding A chair member that is molded and an edge portion of the mesh fabric passes through the middle of the recessed portion on the back surface of the frame body and is located outside the frame body.   The chair member according to claim 6, wherein the frame body and the mesh fabric are integrally manufactured by the method for manufacturing a chair member having the mesh fabric according to any one of claims 1 to 5.

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