JP2016042889A - Eyelet fitting die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyelet fitting die which facilitates cutting of a fabric by a cylindrical part of an eyelet body.MEANS FOR SOLVING THE PROBLEM: An eyelet fitting die (30, 60) which is used for fitting an eyelet body (10) comprising an annular base part (11) and a cylindrical part (12) standing from inside of a radial direction of the base part (11), to a fabric (1) comprises: an annular caulking part (31b, 62) for caulking the cylindrical part (12) of the eyelet body (10) which penetrates the fabric (1); and a fabric support part (34) for supporting the fabric (1) immediately before the cylindrical part (12) of the eyelet body (10) penetrates the fabric (1), and is disposed inside of the radial direction of the caulking part (31b, 62). The fabric support part (34) is elastically deformed when being pressed from the fabric (1). The fabric support part (34) is formed of an elastic material.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an eyelet attaching die, and more particularly, to an eyelet attaching die used together with a punch when attaching an eyelet main body having an annular base portion and a cylindrical portion to a cloth.

  When attaching an eyelet body having an annular base portion and a cylindrical portion to the cloth, generally, the eyelet body is held by the upper punch, a washer is placed on the lower eyelet attachment die, and the cloth is further placed on the eyelet attachment die. After placement, the punch is lowered. Thereby, the cylindrical part of the eyelet body penetrates the cloth downward while cutting the cloth, and is then crimped radially outward by the eyelet attachment die in a C shape. The eyelet main body is attached to the fabric such that the end of the crimped cylindrical portion presses the washer against the fabric. Such an eyelet mounting die is disclosed in, for example, Japanese Patent Application Laid-Open No. 01-94801. As shown in this document, the eyelet attachment die has a caulking portion for caulking the cylindrical portion of the eyelet main body penetrating the fabric, and the cylindrical portion of the eyelet main body cuts and penetrates the fabric. The dough is cut while pressing the dough against the inclined surface of the caulking portion at the tip of the cylindrical portion. At this time, there is a case where the dough is not successfully cut by the cylindrical portion of the eyelet main body because the dough slides on the inclined surface following the tip of the cylindrical portion.

JP-A-01-94801

  In view of the above problems, an object of the present invention is to provide an eyelet attachment die that can easily cut the dough by the cylindrical portion of the eyelet main body.

  In order to solve the above-described problems, according to the present invention, there is provided an eyelet attachment die used when attaching an eyelet main body having an annular base part and a cylindrical part rising from a radially inner side of the base part to the cloth, An annular caulking portion for caulking the cylindrical portion of the penetrating eyelet main body, and a fabric supporting portion for supporting the fabric immediately before the cylindrical portion of the eyelet main body penetrates the fabric, provided on the radially inner side of the caulking portion. The dough support part is provided with an eyelet attachment die that is elastically deformed or displaced by being pushed from the dough during attachment.

  In the present invention, when the eyelet main body is attached to the fabric, immediately before the cylindrical portion of the eyelet body cuts the fabric, the cylindrical portion of the eyelet pulls the fabric, whereby the fabric support portion is pushed from the fabric and elastically Deform or displace. The fabric support portion pushes back the fabric so as to recover from this elastic deformation / displacement, and thereby the fabric is pulled radially inward from the circular portion where the tip of the cylindrical portion contacts. Thereby, cutting | disconnection of the cloth | dough by the front-end | tip of the cylindrical part of eyelet main body is encouraged. In addition, the elastic deformation or elastic displacement of the cloth supporting portion is such that the thickness (or the protruding height from the upper surface of the column member) is slightly reduced (eg, 0.3 to 5 mm).

  In one embodiment of the present invention, the fabric support portion is made of an elastic material. As the elastic material, a thermosetting elastomer, a thermoplastic elastomer, or the like can be used, but is not limited thereto. In this case, the cloth support portion is elastically deformed so as to be thin when pressed from the cloth, and pushes the cloth back with its restoring force.

  In another embodiment of the present invention, the fabric support portion includes a support portion main body that contacts the fabric and an elastic member that supports the support portion main body. Examples of the elastic member include a spring and rubber. In this case, the support part main body is pushed from the cloth, and thereby the elastic member is elastically deformed and the support part main body is displaced.

  In one embodiment of the present invention, the eyelet attachment die includes a column member provided with the caulking portion and the fabric support portion, a sleeve provided on an outer periphery of the column member, and an elastic member supporting the sleeve, Has a washer support portion for supporting a washer attached to the fabric together with the eyelet main body. Examples of the elastic member that supports the sleeve include a spring and rubber.

  In one embodiment of the present invention, the column member has a flat upper surface on the radially inner side of the caulking portion, and the upper surface exists between the dough support portion and the caulking portion. It becomes. When the upper surface of the column member is between the fabric support portion and the caulking portion, when receiving the tip of the cylindrical portion of the eyelet main body at the caulking portion, A step is generated from the upper surface of the column member and from the upper surface to the edge of the fabric support portion, and this step can promote the cutting of the fabric.

  In one embodiment of the present invention, the fabric support portion protrudes from the upper surface of the column member by a predetermined thickness in an initial state where the fabric support portion is not pressed from the fabric, and the predetermined thickness is set so that the washer in the washer support portion is placed. Equal to the vertical distance between the horizontal plane and the top end of the sleeve, or the difference between them is within 0.2 mm. That is, when the predetermined thickness of the fabric support portion in the initial state is “a” and the vertical distance between the horizontal surface and the top end of the sleeve is “b”, a = b or the difference between a and b is within 0.2 mm. It is. The extent to which the protrusion height from the upper surface of the column member is reduced by pressing the cloth support portion from the cloth when attaching is 0.3 mm to 5 mm.

  In the present invention, when the eyelet main body is attached to the fabric, the fabric support portion is pushed from the fabric and is elastically deformed or displaced immediately before the cylindrical portion of the eyelet body cuts the fabric, so that the fabric is restored. Press back. As a result, the fabric is pulled radially inward from the circular portion where the tip of the cylindrical portion contacts, and this facilitates the cutting of the fabric by the tip of the cylindrical portion of the eyelet main body.

FIG. 1 is a partially cutaway perspective view of a grommet body that is attached to a fabric using a grommet attachment die according to the present invention. FIG. 2 is a cross-sectional view showing a state where the eyelet main body is attached to the cloth together with the washer. FIG. 3 is a side view schematically showing the eyelet attachment device. FIG. 4 is a cross-sectional view schematically showing the eyelet attachment die according to one embodiment of the present invention together with a punch. FIG. 5 is an enlarged view of an upper portion of the eyelet attaching die. FIG. 6 is a cross-sectional view schematically illustrating a state in which the eyelet main body, the washer, and the dough are set. FIG. 7 is a cross-sectional view schematically showing a state immediately before the cylindrical portion of the eyelet cuts the dough. FIG. 8 is a cross-sectional view schematically showing a state where the eyelet main body is caulked. FIG. 9 is a cross-sectional view schematically showing an eyelet mounting die according to another embodiment of the present invention.

  Hereinafter, some embodiments of the eyelet mounting die according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments, and is appropriately within the scope of the claims and the equivalents thereof. Changes can be made. FIG. 1 is a perspective view showing a partially broken eyelet main body 10 attached to the fabric 1 using an eyelet attaching die (30) according to the present invention. FIG. 2 is a cross-sectional view showing a state where the eyelet main body 10 is attached to the fabric 1 together with the washer 20. Since the eyelet main body 10 and the washer 20 constitute an eyelet, both are hereinafter collectively referred to as eyelets. The eyelet main body 10 is a metal member, and includes an annular plate-like base portion 11 and a cylindrical portion 12 that rises from the inside in the radial direction of the base portion 11. The base portion 11 is curved so as to be slightly convex on the side opposite to the side from which the cylindrical portion 12 protrudes. The cylindrical portion 12 is open on both the protruding end side and the base portion side. In addition, the thickness of the cylindrical portion 12 gradually decreases from the base portion side to the protruding end side. Although not shown, there is also known an eyelet main body in which a disk having a large number of holes is fitted in the cylindrical portion 12, and such an eyelet main body can be attached to the cloth with the eyelet attaching die of the present invention.

  The washer 20 is an annular plate-shaped metal member having an opening 21 through which the cylindrical portion 12 of the eyelet main body 10 is passed. The washer 20 is substantially horizontal, that is, a plane perpendicular to the axis of the cylindrical portion 12 passed through the opening 21. And the inner portion 22 along the lower portion (the lower portion here is based on the paper surface of FIG. 2; hereinafter, the direction is based on the paper surface of the drawing being referred to). And an outer portion 23 slightly curved in a substantially C shape. The outer end in the radial direction of the outer portion 23 is substantially the same vertical position as the inner portion 22. The outer diameter of the cylindrical portion 12 of the eyelet main body 10 is substantially equal to the inner diameter of the inner portion 22 that is the diameter of the opening 21 of the washer 20. The attachment of the eyelet to the dough 1 will be described in detail later. After the cylindrical portion 12 of the eyelet main body 10 penetrates the dough 1 from its protruding end side (through the dough 1 downward in FIG. 2), the eyelet attachment described later The die (30) is curved in a C-shape outward in the radial direction, and the washer 20 is pressed against the fabric 1 at the tip (projecting end) of the curved cylindrical portion 12. In FIG. 2, the tip of the curved cylindrical portion 12 presses the boundary between the inner portion 22 and the outer portion 23 of the washer 20.

  FIG. 3 is a side view schematically showing the eyelet attachment device 100. The eyelet attaching device 100 includes an eyelet attaching die (hereinafter, also simply referred to as “die”) 30 according to the present invention, a cylindrical punch 40 disposed above the die 30, and one eyelet main body 10 in the punch 40. A main body supply unit 50 that automatically supplies the washers 20 one by one, a washer supply unit 51 that automatically supplies the washers 20 to the die 30 one by one, a main body hopper 52 in which a large number of eyelet main bodies 10 are accommodated, and a large number of washers 20 are accommodated. A washer hopper 53, a main body chute 54 that sends the eyelet main body 10 from the main body hopper 52 to the main body supply unit 50, and a washer chute 55 that sends the washer 20 from the washer hopper 53 to the washer supply unit 51. In this embodiment, the eyelet main body 10 and the washer 20 are automatically supplied to the punch 40 and the die 30. However, this operation may be performed manually by an operator. Since the eyelet attachment die 30 and the punch 40 constitute an eyelet attachment unit, both are hereinafter collectively referred to as an eyelet attachment unit.

  FIG. 4 is a cross-sectional view schematically showing the eyelet attachment unit, that is, the die 30 and the punch 40. As an example, the die 30 includes a steel column member 31, a sleeve 32, and a substantially cylindrical elastic member 33. The sleeve 32 is provided on the outer periphery of the column member 31. As the elastic member 33, a spring, rubber, or the like can be used. More specifically, they are metal coil springs, metal leaf springs, metal disc springs, natural rubber, synthetic rubber, and synthetic resin elastomers. Metal coil springs, metal leaf springs, and metal plate springs are metal elastic materials, and natural rubber, synthetic rubber, and synthetic resin elastomers are resin elastic materials. The column member 31 has a large-diameter portion 31e whose outer diameter is enlarged at the lower portion. The large diameter portion 31e supports the elastic member 33 from below. The sleeve 32 and the elastic member 33 have the same thickness in the radial direction except for portions that are connected to each other (an inner protruding portion 32a and an outer protruding portion 33a described later). The sleeve 32 has a cylindrical inner protrusion 32a that protrudes downward radially inward, and the elastic member 33 has a cylindrical outer protrusion 33a that protrudes upward radially outward. The sleeve 32 and the elastic member 33 are connected to each other from the inner protrusion 32 a of the sleeve 32 and the outer protrusion 33 a of the elastic member 33.

  FIG. 5 is an enlarged view of the upper portion of the die 30. The column member 31 has a horizontal upper surface 31a and a caulking portion 31b that is recessed downward as if the radially outer portion of the upper surface 31a is cut out in an annular shape. The upper surface 31a is a flat surface perpendicular to the up-down direction and is flat. The caulking portion 31b includes an inclined surface 31c inclined downward from the horizontal upper surface 31a and radially outward, and a curved surface 31d curved from the inclined surface 31c outward in the radial direction. At the time of attaching the eyelet to the cloth 1, the cylindrical portion 12 of the eyelet main body 10 cuts the cloth 1 while pressing the cloth 1 against the inclined surface 31c of the caulking portion 31b at the tip, and then the curved surface 31d is used to cut the cloth 1 into FIG. And curled outward in the radial direction. A disk-shaped fabric support portion 34 is fixedly provided on the upper surface 31a. The cloth support portion 34 has an upper surface 34a that comes into contact with the cloth 1 when attaching eyelets to the cloth 1 described later. The fabric support portion 34 is located on the radially inner side of the caulking portion 31b and extends over substantially the entire area except the radially outer end portion of the horizontal upper surface 31a. In the present embodiment, the fabric support portion 34 is formed of an elastically deformable material such as rubber. Here, elastically deformable means that it is deformed by a predetermined force and returns to its original shape when the predetermined force is removed, and pushes back against the force while applying the predetermined force. Deforms while generating force. Other embodiments will be described later. The die 30 has a washer support portion 35 formed by cutting out the radially inner portion of the upper portion of the sleeve 32. The washer support portion 35 includes a horizontal surface 35a on which the outer portion 23 of the washer 20 is placed, and a peripheral surface 35b that is vertically upward from the radially outer end of the horizontal surface 35a. The diameter of the peripheral surface 35 b is substantially the same as the outer diameter of the washer 20. Further, the sleeve 32 is formed with an inclined surface 36 that is inclined downward and radially inward from the radially inner end of the horizontal surface 35a.

  In the initial state (see FIGS. 4 and 5), the sleeve 32 is in the uppermost position. In this initial state, the top end 32b of the sleeve 32 is in substantially the same vertical position as the upper surface 34a of the fabric support portion 34, and the horizontal surface 35a of the washer support portion 35 of the sleeve 32 is the upper surface 31a of the column member 31 or the fabric. It is at the same vertical position as the lower surface of the support portion 34. When the predetermined thickness of the fabric support portion 34 in the initial state where the fabric 1 is not pushed from the fabric 1 is “a” and the vertical distance between the horizontal surface 35a of the sleeve 32 and the top end 32b is “b”, a = b or a And b can be within 0.2 mm. Further, the radially inner end of the inclined surface 36 of the washer support portion 35 is slightly lower than the depression of the crimped portion 31 b of the column member 31.

  Referring to FIG. 4 again, the punch 40 is made of steel as an example, and has an annular curved surface 42 that matches the slightly curved base portion 11 of the washer 20 on the lower surface 41. The washer 20 is held in a state in which the base portion 11 is in contact with the curved surface 42 by an annular member (not shown) provided around the lower end portion of the punch 40 (see FIG. 6). The outer diameter of the punch 40 is substantially the same as the diameter of the peripheral surface 35 b of the washer support portion 35 of the die 30.

Next, the process of attaching eyelets to the fabric 1 using the die 30 according to the present invention will be described.
In the eyelet attachment device 100, the eyelet main body 10 is supplied from the main body supply unit 50 to the punch 40, and the eyelet main body 10 is held in a state where the base portion 11 is in contact with the curved surface 42 of the punch 40. At the same time, the washer 20 is supplied from the washer supply part 51 to the washer support part 35 of the die 30. In addition, the fabric 1 is disposed on the die 30. FIG. 6 shows a state in which the eyelet main body 10, the washer 20, and the fabric 1 are set as described above. Next, the punch 40 is lowered through a lifting mechanism (not shown). Thus, as shown in FIG. 7 and then FIG. 8, after the cylindrical portion 12 of the eyelet main body 10 penetrates the cloth 1 downward, the curved surface 31 d of the caulking portion 31 b of the die 30 forms a C shape outward in the radial direction. It is crimped to be curved. FIG. 7 is a cross-sectional view immediately before the cylindrical portion 12 of the eyelet main body 10 cuts the dough 1. The tip of the cylindrical portion 12 pushes down the dough 1 while pressing the dough 1 against the inclined surface 31c of the caulking portion 31b. Yes. Along with this, the fabric support portion 34 is pushed downward by the fabric 1, and the fabric support portion 34 is elastically deformed so that the thickness becomes smaller than the thickness “a” in the initial state. The fabric support part 34 lifts the fabric 1 so as to recover from this elastic deformation. Therefore, immediately before the cylindrical portion 12 of the eyelet main body 10 penetrates the fabric 1, the fabric 1 is pulled radially inward from the circular portion with which the tip of the cylindrical portion 12 contacts. Thereby, cutting | disconnection of the cloth | dough 1 by the front-end | tip of the cylindrical part 12 of the eyelet main body 10 is encouraged. As soon as the dough 1 is cut by the cylindrical portion 12, the dough support portion 34 is restored to the original thickness “a” (see FIG. 8).

  With reference to FIG. 8, the tip of the cylindrical portion 12 that penetrates the fabric 1 and is crimped by the crimping portion 31 b of the die 30 contacts the boundary between the inner portion 22 and the outer portion 23 of the washer 20. Press the washer 20 against the fabric 1. Thereby, the eyelet main body 10 and the washer 20 are attached to the cloth 1 (see FIG. 2). At the time of caulking the cylindrical portion 12, the sleeve 32 of the die 30 is pushed downward from the punch 40 and the fabric 1, whereby the elastic member 33 is slightly reduced in the vertical direction and the sleeve 32 is lowered from the initial position ( (See FIG. 8).

  FIG. 9 is a cross-sectional view schematically showing another embodiment of the eyelet attachment unit according to the present invention. The eyelet attachment die 60 is the same as the above-described die 30 except that the structure of the fabric support portion is different. Therefore, the description of the sleeve and the elastic member will be omitted by using the same reference numerals 32 and 33 as those of the die 30. The eyelet attachment die 60 includes a column member 61. The column member 61 has a caulking portion 62 similar to that of the die 30. The column member 61 is provided with a columnar gap 63 extending downward from the upper end thereof. A fabric support portion 64 is incorporated in the gap 63. The gap 63 opens to the upper surface 61 a of the column member 61, and the bottom surface of the gap 63 is at the same vertical position as the lower end of the sleeve 32. The upper surface 61 a exists in an annular shape on the inner side in the radial direction of the caulking portion 62. The cloth support portion 64 includes a columnar support portion main body 65 made of metal or resin, and a spring 66 as an elastic member that supports the support portion main body 65 from below. The height protruding upward from the upper surface 61a of the support body 65 in the initial state when not pressed from the fabric 1 is substantially the same as the vertical distance between the horizontal surface 35a and the top end 32b of the sleeve 32. It can be within 0.2 mm.

  Immediately before the cylindrical portion 12 of the eyelet main body 10 cuts the dough 1, the support portion main body 65 is pushed downward from the dough 1, whereby the spring 66 is slightly compressed downward and elastically deformed, and the support portion main body 65 is Displaces slightly downward. Such displacement of the support body 65 is referred to as elastic displacement. At this time, the spring 66 pushes the support portion main body 65 upward so that the spring 66 is restored, whereby the support portion main body 65 lifts the fabric 1. Therefore, immediately before the cylindrical portion 12 of the eyelet main body 10 penetrates the fabric 1, the fabric 1 is pulled radially inward from the circular portion with which the tip of the cylindrical portion 12 contacts. Thereby, cutting | disconnection of the cloth | dough 1 by the front-end | tip of the cylindrical part 12 of the eyelet main body 10 is encouraged.

  As described above, in the eyelet attachment dies 30 and 60 according to the present invention, when the cylindrical portion 12 of the eyelet main body 10 penetrates the cloth 1, the cloth support portions 34 and 64 are elastically deformed or elastically displaced while being tensioned to the cloth 1. By giving this, it is possible to facilitate the cutting of the dough 1 by the cylindrical portion 12.

DESCRIPTION OF SYMBOLS 1 Material 10 Eyelet main body 11 Base part 12 Cylindrical part 20 Washer 30, 60 Eyelet attachment die 31, 61 Column member 31a, 61a Column member upper surface 31b, 62 Clamping part 32 Sleeve 32b Top end of sleeve 33 Elastic member 34, 64 Fabric Support part 35 Washer support part 35a Horizontal surface of washer support part 40 Punch 65 Support part body 66 Spring (elastic member)
100 Eyelet mounting device

Claims (6)

Eyelet attachment die (30, 60) used when attaching an eyelet main body (10) having an annular base part (11) and a cylindrical part (12) rising from the inner side in the radial direction of the base part (11) to the cloth (1). ) And
An annular caulking portion (31b, 62) for caulking the cylindrical portion (12) of the eyelet main body (10) penetrating the fabric (1);
The fabric support portion (34, which supports the fabric (1) immediately before the cylindrical portion (12) of the eyelet main body (10) penetrates the fabric (1), which is provided on the radially inner side of the crimping portions (31b, 62). 64)
The dough support portion (34, 64) is an eyelet attachment die that is elastically deformed or displaced by being pushed from the dough (1) when attached.   The eyelet attachment die according to claim 1, wherein the fabric support portion (34) is made of an elastic material.   The eyelet attachment die according to claim 1, wherein the fabric support portion (64) includes a support portion main body (65) contacting the fabric (1) and an elastic member (66) supporting the support portion main body (65). The eyelet mounting die (30, 60)
Pillar members (31, 61) provided with the caulking portions (31b, 62) and fabric support portions (34, 64);
A sleeve (32) provided on the outer periphery of the column member (31, 61);
An elastic member (33) supporting the sleeve (32),
The eyelet attachment die according to any one of claims 1 to 3, wherein the sleeve (32) has a washer support portion (35) for supporting a washer (20) attached to the fabric (1) together with the eyelet main body (10). .   The column member (31, 61) has a flat upper surface (31a, 61a) on the radially inner side of the crimped portion (31b, 62), and the upper surface (31a, 61a) is the fabric support portion. The eyelet attachment die according to claim 4, wherein the eyelet attachment die is present between the crimping portions (31 b, 62).   The fabric support portion (34, 64) protrudes from the upper surface (31a, 61a) of the column member (31, 61) by a predetermined thickness in an initial state where it is not pressed from the fabric (1). The horizontal distance (35a) on which the washer (20) is placed in the washer support portion (35) and the vertical distance between the top end (32b) of the sleeve (32) are equal to or less than 0.2 mm. Item 6. The eyelet mounting die according to Item 5.

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