JPH10146628A - Eyelet attaching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eyelet attaching method by positioning a holding point of a base cloth between an upper die and a lower die near a bite in part to the base cloth of an eyelet, thereby preventing the base cloth from being elongated to outer periphery at caulking and smoothly conduct pressing, punching, caulking of the base cloth. SOLUTION: The base cloth 3 is arranged between an upper die 5 and a lower die 8, the eyelet 1 is arranged on the base cloth 3, in the state that, by descending the upper die 5 against the lower die 8, the base cloth 3 is held between a pressing body 4, which is arranged to an axial center part of an upper die main body 9 and spring energized downward, and a protruding part 6 of the lower die 8 facing the pressing body 4, the base cloth 3 is punched by pressure force of the upper die main body 9 resulting from descending of the upper die 5 with its cylindrical part lower end 1a while descending the eyelet 1, successively, a cylindrical part 1a lower end of the eyelet 1 is guided and bent into a curl formed groove 6a of the lower die 6, the eyelet 1 is caulked to the base cloth 3. In this method, the base cloth 3, between the pressing body 4 and the protruding 6, is punched, in the state at least held by the outer peripheral part 4a of the pressing body, by the cylindrical part 1a lower end of the eyelet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching eyelets for caulking eyelets to a base cloth such as cloth or leather using a caulking device.

[0002]

2. Description of the Related Art As shown in FIG. 1, this kind of eyelet has a slight difference in shape, but generally comprises an eyelet body 1 and a washer 2, and is formed by punching a thin metal plate. The eyelet body 1 is, for example, as shown in FIG.
a, and a flange portion 1b that is continuously extended and curved so as to be divergent. The washer 2 has an opening 2a into which the cylindrical portion 1a fits.
It is formed in a ring shape provided with. Then, as shown in FIG. 8, the eyelet body 1 and the washer 2 are caulked by bending the lower end of the cylindrical portion 1a fitted into the opening 2a through the base cloth 3 such as cloth or leather between the eyelet body 1 and the washer 2. The eyelets are swaged to the base cloth 3. In addition, there is an eyelet without the washer 2 for directly caulking the lower end of the cylindrical portion 1a of the eyelet body 1 to the base cloth 3, and in the present invention, the eyelet body 1 is regarded as an eyelet.

In order to attach the eyelets to the base cloth 3, conventionally,
After an opening in which the cylindrical portion 1a can be fitted is provided in the base cloth 3 in advance,
The caulking is performed as described above by using a caulking device including a movable upper mold and a fixed lower mold. However, the work of providing an opening in the base fabric 3 is troublesome, and even in the case of the caulking work, it takes time and effort to insert the cylindrical portion 1a of the eyelet into the opening, and the work efficiency is poor. Therefore, there is a method for attaching the eyelets using a caulking device as shown in FIG. 8 (see Japanese Patent Application Laid-Open No. 1-94801).

In the caulking device shown in this conventional example, the pressing portion 4 arranged inside the cylindrical portion 1a of the eyelet main body 1 during the caulking operation and the annular groove 9a along the curved shape of the flange portion 1b of the eyelet main body 1 are formed. A movable upper mold 5 having an upper mold body 9 and a raised portion 6 for holding the base cloth 3 between the pressing portion 4 and guiding the lower end of the cylindrical portion 1a when the pressing portion 4 descends. A fixed lower mold 8 provided with an annular curl forming groove 6 a to be bent is provided around the raised portion 6. The pressing portion 4 having a spherical shape is urged downward by the force of a spring (not shown), and the base cloth 3 is sandwiched between a lower end portion 4 a of the lower surface and an upper surface top portion 6 c of the raised portion 6 protruding in a conical shape. doing.

[0005] At the time of the eyelet caulking operation as shown in Fig. 8, the pressing portion 4 projecting from the cylindrical portion 1a of the eyelet main body 1 disposed on the base cloth 3 is raised above the cylindrical portion 1a while bending the spring. Retract to. As a result, the upper die body 9 in which the pressing portion 4 is arranged at the axis thereof is lowered, and the cylindrical portion 1a of the eyelet main body 1 is held in a state where the base cloth 3 is sandwiched between the upper and lower dies 5, 8 as described above. The lower end is guided into the curl forming groove 6a of the lower die 8 to be bent while being pressed against the base cloth 3 and punching the base cloth 3 at the lower end of the cylindrical portion 1a.
The eyelets are swaged to the base cloth 3.

[0006]

However, in the above-mentioned conventional eyelet mounting method, although the base cloth 3 is held between the upper and lower dies 5, 8, the base cloth 3 is held between the lower end portion 4a and the upper top portion 6a. Only at point B. Therefore, since there is a distance between the portion where the lower end of the cylindrical portion 1a bites into the base cloth 3 and the pinching point B, the cylindrical portion from the pinching point B to the base cloth 3 as shown in FIG. The base cloth 3 extends in the outer peripheral direction due to the pulling force indicated by the arrow A until the lower end biting portion 1a, and the tension of the cloth near the biting portion is weakened, so that the base cloth 3 is hardly punched by the lower end of the cylindrical portion 1a. Problem.

In order to solve such a problem, a spike is provided on the upper surface of the washer 2 which is located near the outer periphery of the base cloth 3 into which the lower end of the cylindrical portion 1a bites, and the base cloth 3 is hooked on the spike. Thus, it can be considered that the extension of the base cloth 3 is suppressed, so that the base cloth 3 can be easily punched at the lower end of the cylindrical portion 1a. However, this method only suppresses the elongation of the cloth on the outer peripheral side of the biting portion at the lower end of the cylindrical portion 1a, and it is difficult to improve the above-described problem.

Therefore, the present invention solves the above-mentioned problems, and uses a caulking device that does not need to provide an opening in the base cloth in advance, thereby reliably punching the base cloth and smoothly stopping the eyelets on the base cloth. It is an object of the present invention to provide a method for attaching eyelets that can be performed.

[0009]

According to the present invention, in order to achieve the above object, a base cloth is arranged between an upper mold and a lower mold, and an eyelet is arranged on the base cloth, so that the upper mold is formed into a lower mold. On the other hand, in a state where the base cloth is sandwiched between a pressing body arranged by being spring-biased downward on an axis of the upper mold body and a lower mold ridge facing the pressing body, While lowering the eyelet with the pressing force of the upper die body accompanying the lowering of the mold, punching the base cloth at the lower end of the cylindrical part, then guiding the lower end of the eyelet cylindrical part to the curl forming groove of the lower mold and bending the eyelet, forming the base cloth A method for crimping, wherein the base cloth is punched by the lower end of the eyelet cylindrical portion while being sandwiched between the pressing body and the raised portion at least at their outer peripheral portions.

In the present invention, the lowering means a relative lowering of the upper die with respect to the lower die. In addition to the case described in the embodiment described later, the reverse case of fixing the upper die and raising the lower die is also used. Shall be included.

According to the present invention, the base cloth disposed between the upper and lower dies is provided at least at the outer peripheral portion between the pressing body disposed on the axial center portion of the upper die body and the raised portion of the lower die by lowering the upper die body. In other words, the lower end of the eyelet can pinch the base cloth exactly along the entire inner peripheral side of the portion where the lower end of the cylindrical part bites into the base cloth, creating a tension state of the cloth necessary for punching the base cloth by the lower end of the cylindrical part. be able to. Therefore, the cloth does not extend in the outer peripheral direction as in the conventional example where there is a distance from the holding point between the upper and lower molds to the base cloth and the biting part by the lower end of the cylindrical part, and the pressing, punching and crimping of the base cloth by the lower end of the cylindrical part are smooth. The eyelet mounting work can be performed efficiently.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an example of an eyelet used in the present invention. This eyelet is made up of an eyelet body 1 and a washer 2 and is formed by stamping a thin metal plate. The eyelet main body 1 has a cylindrical portion 1a, and a flange portion 1b that is continuously and divergently curved.
Is formed in a ring shape provided with an opening 2a into which is fitted, and an outer peripheral portion is a curved portion 2b having an arc-shaped cross section.

FIG. 2 shows a caulking device used for attaching the eyelets according to the present embodiment. The caulking device includes a movable upper die 5 and a fixed lower die 8. The upper die 5 has a holding body 13 in which a spring 14 is disposed in a hollow portion 13a, an upper die body 9 in which the lower half has a large diameter in a stepped shape and has an opening 9b below, and a lower portion of the upper die 9 which is provided with a spring 14 at its axial center. And a pressing member 12 arranged to be urged. The pressing body 12 is disposed inside the cylindrical portion 1a of the eyelet main body 1 at the time of caulking operation. 4. The lower surface of the pressing portion 4 is provided with a concave portion 4b at the center except for the outer peripheral portion 4a. The diameter of the pressing portion 4 is substantially the same as the diameter of the cylindrical portion 1a of the eyelet main body 1. The eyelet main body 1 has its flange portion 1b in an annular groove 9a provided on the outer periphery of the lower surface of the upper die body 9, and its cylindrical portion. 1a is loaded in close contact with the outer peripheral side surface of the pressing portion 4, respectively.

The lower die 8 is fixed to a base (not shown), and the base cloth 3 is placed on the upper surface thereof. The central portion of the upper surface is slightly higher than the outer peripheral surface to form a raised portion 6. Around the raised portion 6 is a cylindrical portion 1 when the upper mold 5 descends.
An annular curl forming groove 6a that guides the lower end is provided. The curl forming groove 6a is gently inclined toward the outer periphery as shown in FIG. 3 and FIG. 4 in an enlarged manner, and then continues to the housing recess 6b of the washer 2 which rises slightly and becomes flat. The inclined surface of the curl forming groove 6a is made gentle (increases the inclination angle), and while the eyelet main body 1 is lowered by the pressing force of the upper die main body 9 accompanying the lowering of the upper die 5, the lower end of the cylindrical portion 1a is pressed to form the curl. The length guided by the inclined surface of the groove 6a is increased. During this guide, the base cloth 3 is
It is punched so that it is torn by the lower end. At this time, since the lower end of the cylindrical portion 1a is guided longer, the base cloth 3 can be reliably punched, but the lower end of the cylindrical portion 1a is also easily broken. Therefore, it is desirable to increase the thickness of the eyelet main body 1.

Referring to FIGS. 3 and 4, the lower end of the cylindrical portion 1a of the eyelet main body 1 is pressed into the base cloth 3 sandwiched between the upper dies 5 and 8 and bites into the base cloth 3, whereby the base cloth 3 is punched out. The method for caulking the base cloth 3 will be described.

After arranging the washer 2 in the accommodation recess 6b of the lower die 8, the base cloth 3 is placed on the upper surface of the lower die 8 in close contact with the raised portion 6, and the eyelet main body 1 is placed around the outer periphery of the pressing portion 4. The cylindrical portion 1a is fitted into the upper die 5 by fitting the flange portion 1b into the annular groove 9a of the upper die body 9, and then the upper die 5 is lowered. The part 6 with the base cloth 3
Press through. Then, the base fabric 3 is strongly held between the outer peripheral portion 4 a on the lower surface of the pressing portion 4 and the flat surface of the raised portion 6. When the upper mold 5 is further lowered in this state, the cylindrical portion 1a
While the lower end is strongly pressed and biting, the base fabric 3 is cut out in a circular shape while being guided by the curl forming groove 6a, and is punched to tear off. As a result, the lower end of the cylindrical portion 1a curves in the curl forming groove 6a and is caulked to the washer 2 as shown in FIG. 4, and the attachment of the eyelets to the base cloth 3 is completed.

According to this embodiment, as compared with the conventional example (FIG. 8) in which there is a distance from the clamping point B of the base cloth 3 between the upper and lower dies 5 and 8 to the portion where the lower end of the cylindrical portion 1a bites into the base cloth 3. Outer peripheral portion 4 on the lower surface of pressing portion 4 closely attached to the inner peripheral side of the lower end thereof
Since the base cloth 3 is tightly held between the base cloth 3 and the upper surface of the raised portion 6, the base cloth 3 is not pulled in the outer peripheral direction, and the tension of the cloth necessary for punching the base cloth 3 by the lower end of the cylindrical portion 1a can be created. it can. Therefore, the pressing, punching, and crimping of the base cloth 3 are performed smoothly, so that the eyelet mounting work can be performed efficiently. In the present embodiment, the concave portion 4b is provided on the lower surface of the pressing portion 4 to limit the point of holding the base cloth 3 while leaving the outer peripheral portion 4a. A point may be formed. In this case, the lower surface of the pressing portion 4 is flattened, while a concave portion is provided in the center of the upper surface of the raised portion 6 so that the outer peripheral portion and the lower surface of the pressing portion 4 sandwich the cloth. I do.

FIGS. 5 and 6 show another embodiment in which the shape of the eyelet main body 1 and the washer 2 is caulked using eyelets which are slightly different from the above-described embodiment.

In this eyelet, while the outer peripheral edge of the collar portion 1b of the eyelet main body is curved downward, the outer periphery of the curved portion 2b of the washer 2 is further curved upward, and a plurality of (6 to
(8) spines 2c. These barbs 2c abut the lower surface of the curved portion of the flange portion 1b via the base cloth 3. The base cloth 3 in which the protruding barbs 2c are located on the outer peripheral side from the lower end of the cylindrical portion 1a
To suppress the elongation of the base cloth 3 and create a tensioned state of the cloth together with the state of clamping the base cloth by the outer peripheral surface between the upper and lower dies shown in the above-described embodiment, and the base cloth 3 by the cylindrical portion 1a of the eyelet main body 1. It is possible to make the punching of the smoother.

The present invention can be configured in various modes in addition to the embodiments described above. For example, as shown in FIG. 7, the lower surface 4c of the pressing portion 4 and the upper surface of the raised portion 6 are both flat surfaces, and the base cloth 3 is pinched without forming the holding points to the base cloth 3 as described above. Alternatively, the eyelet can be constituted only by the eyelet body 1 without a washer.

In the above embodiment, the lower die is fixed and the upper die is lowered, so that the eyelets are lowered by the pressing force of the upper die body to perform the punching operation of the cloth. Since the lowering means a relative lowering movement of the upper mold with respect to the lower mold, it is also possible to fix the upper mold and implement the lower mold as an ascending type.

[0023]

According to the present invention, the extension of the base fabric to the outer peripheral side during the caulking operation is performed by setting the holding point of the base fabric between the upper mold and the lower mold near the portion where the eyelets bite into the base fabric. Can be provided, and an eyelet attachment method that can smoothly press, punch, and caulk the base cloth can be provided.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an eyelet and a half section thereof.

FIG. 2 is a longitudinal side view showing an embodiment of a caulking device used in the present invention.

FIG. 3 is a longitudinal sectional side view showing a part of the enlarged view.

FIG. 4 is an enlarged longitudinal side view showing a state where the eyelets are attached to a base cloth.

FIG. 5 is a side view showing an example of another eyelet and a half of the eyelet.

FIG. 6 is a vertical sectional side view showing another embodiment using the eyelets.

FIG. 7 is a longitudinal side view showing another embodiment of the present invention.

FIG. 8 is a longitudinal sectional side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Eyelet main body (eyelet) 3 Base cloth 4 Pressing part (pressing body) 4a Outer peripheral part 5 Upper die 6 Raised part 6a Curl forming groove 8 Lower die 9 Upper die main body

Claims (1)

[Claims] 1. A base cloth is arranged between an upper mold and a lower mold, an eyelet is arranged on the base cloth, and the upper mold is lowered with respect to the lower mold.
In a state where the base cloth is sandwiched between the pressing body arranged by being spring-biased downward on the axial center portion of the upper mold body and the lower mold ridge facing the pressing body, the upper mold is lowered. While lowering the eyelets with the pressing force of the upper die body, punching the base cloth at the lower end of the cylindrical portion, then guiding the lower end of the cylindrical portion of the eyelets to the curl forming groove of the lower die, bending the eyelets, and fixing the eyelets to the base cloth. A method of attaching eyelets, wherein a base cloth is punched by a lower end of a cylindrical portion of an eyelet in a state where a base cloth is sandwiched between the pressing body and the raised portion at least at their outer peripheral portions.