JP2006055455A - Rivet punch for fixing snap fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably fastening even a rivet member which is made of resin exhibiting a high elongation rate. <P>SOLUTION: The rivet punch 6 is mounted on a driving tool 3 of a snap fastener fixing device. A sheet-like member 10 is arranged between the rivet member 1 held by a receptacle 2 and a fitting member 9 held by the driving tool 3. In this state, a guide punch 7 mounted on the driving tool 3 is allowed to press the fitting member 9 against the sheet-like member 10 by lowering the driving tool 3. A protrusion 1a of the rivet member 1 is allowed to penetrate into the sheet-like member 10 and pass through a through hole 9a in the fitting member 9. The end of the protrusion 1a is struck by the driving tool 3 and is deformed in such a manner that its diameter is enlarged. In this way, the rivet member 1 and the fitting member 9 are fastened with the sheet-like member 10 sandwiched between them. In this case, the center of the end of a cylindrical shaft 11 is formed in a circular surface 12 which is perpendicular to the axis. An annular groove 13 is formed in its periphery. The whole surface of the circular surface 12 is formed into a rough surface S having fine irregularities 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a caulking punch for attaching a snap fastener, and more particularly, in a state where a sheet-like member such as a fabric is disposed between a rivet member held by a receiving tool and a fitting member held by the driving tool. The guide punch mounted on the driving tool presses the fitting member against the sheet-like member, and the protrusion of the rivet member is pierced into the flexible film body and penetrates the fitting member. The rivet member and the fitting member are clamped in a state where the sheet-like member is sandwiched by inserting the hole into the hole and striking the tip of the protrusion with a caulking punch mounted on the driving tool to expand the diameter. The present invention relates to the caulking punch in the snap fastener attaching machine.

  In the conventional snap fastener mounting caulking punch, as shown in Patent Documents 1, 2, and 3, one conical recessed portion is formed at the center of the tip of the cylindrical shaft portion. As shown in FIGS. 8A and 8B, a guide punch (not shown) presses the fitting member a against the sheet-like member b and pierces the projection d of the rivet member c into the sheet-like member b, as shown in FIGS. At the same time, in the state of being inserted through the through hole e of the fitting member a, the tip of the projection d is fitted into the conical recess g of the caulking punch f, the axial center of the projection d is held at a fixed position, and the projection d is positioned. However, the crimping punch f is lowered and hits the tip of the projection d, so that the crimping is securely stopped.

  The caulking punch f is very effective when the material of the rivet member c is a hard synthetic resin such as polyacetal. However, in recent years, a resin having a high elongation rate such as polyester or polybutylene terephthalate is often used as the material of the rivet member c so that the clothes and the snap fastener can be easily recycled by using the same material. In some cases, the protrusion d of the rivet member c is crushed in a state of being laid down, and the caulking is sometimes impossible or incomplete.

  This is because in the rivet member c made of a resin having a high elongation rate such as polyester or polybutylene terephthalate, the penetration force of the protrusion d when the fitting member a is pressed against the sheet-like member (cloth) b is weak. Therefore, when the projection d penetrates the fabric, the projection d is slightly pushed and bent by the fiber constituting the fabric, the tip position of the projection d is displaced from the axial center of the caulking punch f, and does not fit into the conical recessed portion g. Alternatively, when the protrusion d passes through the fabric, the constituent fibers of the fabric are not cut, and a part of the fiber is pushed into the conical recessed portion g at the tip of the protrusion d, and the conical recessed portion precedes the protrusion d. It is considered that the reason is that g is filled with fibers.

JP 2004-73368 A Utility model registration No. 2592699 Japanese Patent Publication No. 60-36281

  The present invention has been made on the basis of the above-mentioned consideration results, so that even a rivet member made of a resin having a high elongation rate, such as polyester or polybutylene terephthalate, can be securely crimped. The task is to do.

  In order to solve the above problems, the technical means taken by the present invention are as follows. That is, the snap fastener mounting caulking punch according to the present invention is formed such that the tip central portion of the cylindrical shaft portion is formed into a circular surface perpendicular to the shaft core, an annular groove is formed on the outer periphery thereof, and the entire area of the circular surface is formed. It is characterized by being formed on a rough surface with fine irregularities (claim 1).

  In addition, the rough surface in the invention described in claim 1 may be formed by lattice-like unevenness (claim 2), or may be formed by innumerable independent unevenness (claim 3).

  Further, the snap fastener attaching machine according to the present invention is configured such that the driving tool is attached to the receiving tool while the sheet-like member is disposed between the rivet member held by the receiving tool and the fitting member held by the driving tool. By moving closer, the guide punch mounted on the driving tool presses the fitting member against the sheet-like member, pierces the projection of the rivet member into the sheet-like member, and inserts it into the through-hole of the fitting member. A snap fastener attaching machine that is configured to squeeze the rivet member and the fitting member into a state sandwiching the sheet-like member by striking the tip portion with a caulking punch mounted on the driving tool and expanding the diameter thereof. The caulking punch for attaching a snap fastener according to any one of claims 1 to 3 is used as the caulking punch. There.

  According to said structure, even if it is a rivet member manufactured with resin with a large elongation rate like polyester, a polybutylene terephthalate, etc., it becomes possible to carry out the crimping stop reliably. That is, since the entire circular surface perpendicular to the axis of the caulking punch is formed into a rough surface with fine irregularities, when the protrusion penetrates the fabric (sheet-like member), the protrusion is caused by the constituent fibers of the fabric. Even if the tip position of the protrusion is displaced from the axial center of the caulking punch due to being pushed and bent, or when the protrusion penetrates the fabric, the fiber constituting the fabric is not cut, and a part of the fiber is the tip of the protrusion. Even if the center of the rough surface is pressed and the unevenness at the center of the rough surface is filled with fibers, the tip of the protrusion is related to any unevenness of the rough surface formed over the entire circular surface. In addition, further misalignment of the protrusion is prevented, and the protrusion of the rivet member can be reliably crushed.

  FIG. 1 shows a main part of a snap fastener attaching machine. The snap fastener attaching machine includes a receiving tool 2 that holds the rivet member 1 so that the protrusion 1a faces upward, and a driving tool 3 that is driven up and down with respect to the receiving tool 2. The driving tool 3 includes an elevating member 4 that moves up and down with respect to the receiving device 2 by power of an elevating drive device (not shown), a caulking punch 6 fixed to the elevating member 4 with a set bolt 5, and a caulking punch 6. A cylindrical shaft-shaped guide punch 7 that can slide up and down, and a spring 8 as a biasing means that slides and biases the guide punch 7 downward are provided. The guide punch 7 is configured to hold a male-type or female-type fitting member 9 having a through hole 9a for inserting the projection 1a of the rivet member 1 in the center.

  Then, by lowering the driving tool 3 in a state where the sheet-like member 10 such as cloth is disposed between the rivet member 1 held by the receiving tool 2 and the fitting member 9 held by the driving tool 3, The guide punch 7 presses the fitting member 9 against the sheet-like member 10 to pierce the projection 1a of the rivet member 1 into the sheet-like member 10 and insert it into the through hole 9a of the fitting member 9, and the tip of the projection 1a is The rivet member 1 and the fitting member 9 are crimped to a state in which the sheet-like member 10 is sandwiched by striking with a caulking punch 6 and expanding and deforming.

  As shown in FIGS. 2 and 3, the caulking punch 6 is formed in a circular surface 12 that is perpendicular to the axial center of the cylindrical shaft portion 11 and has a linear slope on the outer periphery thereof. The circular groove 13 is formed, and the entire surface of the circular surface 12 is formed on a rough surface S having fine irregularities 14. Specifically, the grid-like irregularities 14 are formed by processing the grooves on the circular surface 12 in a grid pattern. On the contrary, the grid-like irregularities 14 are formed by raising the grid-like irregularities 14. It may be formed.

  According to said structure, since the whole circular surface 12 perpendicular | vertical with respect to the axial center of the crimping punch 6 is formed in the rough surface S with the fine unevenness | corrugation 13, the processus | protrusion 1a makes cloth (sheet-like member 10). When penetrating, the protrusion 1a is pushed and bent by the constituent fibers of the fabric, and the tip position of the protrusion 1a may deviate from the axial center of the caulking punch 6, or when the protrusion 1a penetrates the cloth, the structure of the fabric Even if the fiber is not cut and a part of the fiber is pressed against the center of the rough surface S at the tip of the protrusion 1a, the unevenness 13 at the center of the rough surface S may be filled with the fiber. The front end of the projection is engaged with any one of the irregularities 13 of the rough surface S formed over the entire area of the circular surface 12, and further misalignment of the protrusion is prevented.

  The annular groove 13 serves to smoothly guide the tip of the crushed projection 1a radially outward on the inclined surface of the annular groove 13 and plastically deform it into a flange shape having an appropriate thickness.

  Therefore, even if the rivet member 1 is made of a resin having a high elongation rate such as polyester or polybutylene terephthalate, the protrusion 1a of the rivet member 1 can be reliably crushed and can be securely crimped. Is possible.

  4 and 5 show another embodiment, which is characterized in that the rough surface S is formed by countless independent small irregularities 14. According to this configuration, innumerable independent irregularities 14 can be easily formed by electric discharge machining, so that the caulking punch 6 can be easily manufactured (processing the rough surface S). Other configurations and operations are the same as those in the embodiment of FIGS.

  6 and 7 show another embodiment, which is characterized in that the slope on the outer edge side of the annular groove 13 is formed into a curved slope having an appropriate radius. Although the rough surface S is formed by the lattice-like unevenness 14, the rough surface S may be formed by an infinite number of independent small unevenness 14 as in FIGS.

  In each of the above-described embodiments, the circular surface 12 and the outer edge of the annular groove 13 may be formed at the same height as shown in FIGS. 2 and 4, or as shown in FIG. The surface 12 may be formed lower than the outer edge of the annular groove 13.

It is a vertical side view of the principal part of the snap fastener attaching machine which shows embodiment of this invention. It is sectional drawing of the crimping punch which shows embodiment of this invention. It is a top view of the caulking punch of FIG. It is sectional drawing of the crimping punch which shows other embodiment of this invention. It is a top view of the caulking punch of FIG. It is sectional drawing of the crimping punch which shows other embodiment of this invention. It is a top view of the caulking punch of FIG. It is explanatory drawing of the conventional crimping punch.

Explanation of symbols

6 Caulking punch 11 Cylindrical shaft portion 12 Circular surface 13 Circular groove 14 Concavity and convexity S Rough surface

Claims (4)

    The center part of the end of the cylindrical shaft part is formed in a circular surface perpendicular to the shaft core, an annular groove is formed in the outer periphery thereof, and the entire area of the circular surface is formed in a rough surface with fine irregularities. Caulking punch for attaching snap fasteners.     The crimping punch for attaching a snap fastener according to claim 1, wherein the rough surface is formed by lattice-shaped irregularities.     The crimping punch for attaching a snap fastener according to claim 1, wherein the rough surface is formed by countless independent irregularities.     With the sheet-like member disposed between the rivet member held by the receiving tool and the fitting member held by the driving tool, the driving tool moves closer to the receiving tool so that the driving tool is equipped. The guide punch presses the fitting member against the sheet-like member, pierces the projection of the rivet member into the sheet-like member and inserts it into the through-hole of the fitting member, and the tip of the projection is a caulking punch equipped on the driving tool. A snap fastener attaching machine adapted to crimp the rivet member and the fitting member into a state sandwiching the sheet-like member by striking and expanding the diameter, and as the crimping punch, A snap fastener mounting machine using the snap fastener mounting caulking punch according to any one of the above.

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