JP3262180B2 - Hole forming method for resin fiber belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming holes in a resin fiber belt made of, for example, polyester fiber or nylon fiber.

[0002]

2. Description of the Related Art Conventionally, when a hole is formed in a belt made of a resin fiber such as polyester fiber (hereinafter simply referred to as a belt), a sharp angle is formed in order to prevent the fibers around the formed hole from fraying. A method has been adopted in which a heated iron having a sharp tip is penetrated through a belt to form a hole and simultaneously melt a molten fiber resin around the hole. In this method, as shown in FIGS. 6A to 6G, the belt W is placed on the placement surface 82A of the pedestal 82 having the insertion hole 82B through which the tip of the iron 5A can be inserted, and the heater 52A is used. Insert the tip of the heated iron 5A into the insertion hole 8
Insert through 2B. Thereby, the tip of the iron 5A penetrates the belt W, and a hole is formed in the belt W.

[0003]

However, when the hole is formed by the above-described method, when the tip of the iron 5A enters the belt W, the resin of the fiber that is heated and melted by the iron 5A is deposited on the surface of the belt W. It flows out (FIG. 6B), and when the tip of the iron 5A penetrates the belt W, it flows out to the back side of the belt W (FIGS. 6D and 6E). The molten resin that has flowed out on both the front and back surfaces of the belt W in this manner is
When a few seconds elapse after the tip of the iron 5A is pulled out, the tip 5A sticks in a raised state around the formed hole to form a burr B. In particular, burrs B formed on the surface side of the belt W
When the tip of the iron 5A is pulled out, the molten resin is pulled up and rises, and the height of the burrs B is increased suddenly (FIGS. 6F and 6G). When such burrs B are formed on the belt W, the insertion work becomes difficult in the process of thereafter inserting the belt W into the belt mounting hole of an accessory or the like, and there is a problem that workability deteriorates. There is also a problem that the appearance of the product is deteriorated by the formed burr B.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a problem to be solved is to form a hole in a resin fiber belt capable of completely removing burrs generated around the formed hole. It is to provide a method.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method of mounting a resin fiber belt on a flat mounting surface of a pedestal, the flat surface corresponding to the size of a hole to be formed. A hole opening step of opening the hole by pressing the front end surface of the heated iron having the front end surface against the resin fiber belt on the mounting surface to melt the resin fibers, and corresponding to the opening hole The resin fiber belt is placed with the insertion hole and the opening hole aligned with each other on a flat support surface having an insertion hole of a size to be inserted. The insertion protrusion is inserted into the opening and the insertion hole with a press rod having an insertion protrusion matching the hole, and the flexible molten resin remaining around the opening by passing the insertion protrusion into the opening and the insertion hole is used as the support surface and the pressing surface and And a deburring step of crushing with the insertion protrusion. It has adopted the cormorant means.

[0006]

According to the hole forming method of the present invention, in the hole opening step,
A hole is opened in the belt by pressing a heated iron having a flat tip surface against a resin fiber belt mounted on the flat mounting surface. That is, the resin fibers of the belt pressed between the flat mounting surface of the pedestal and the flat tip surface of the iron are melted by the heat and pressure of the iron, and a hole is opened in that portion. At this time, the resin fiber in the portion near the tip of the iron melts and remains around the opening hole to form burrs, but the burrs do not occur on the back side of the belt because the mounting surface is flat. . Moreover, since the burr formed of the molten resin on the surface side of the belt does not include the resin corresponding to the hole, the height of the burr does not increase.

[0007] In the next deburring step, the insertion protrusion of the press rod is inserted into the opening hole of the belt and the insertion hole of the planar support surface to remove the soft molten resin remaining around the opening hole. It is crushed by the support surface, the pressing surface, and the insertion protrusion. As a result, burrs generated around the formed hole are completely removed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the hole forming method of this embodiment, holes are formed in a strap belt made of polyester fiber and having a width of 20 mm and a thickness of 1 mm, and a hole opening step and a deburring step are performed. FIG. 1 is an overall perspective view of an apparatus for performing a hole opening step and a deburring step, and the apparatus will be described before performing both steps.

The present apparatus has a wall-shaped base 2 erected on a base 1 so as to extend in the front-rear direction, and is guided by a guide rail 21 at the upper end on the right side of the wall-shaped base 2. A movable base 3 movable in the direction is provided. This movable base 3
Is driven by the first air cylinder 31. And
On the lower surface side of the movable base 3, a support plate 4 guided by a pair of left and right guide portions 32 and movable vertically is provided horizontally. The support plate 4 is driven by the second air cylinder 41. On the front side of the lower surface of the support plate 4, two rod-shaped irons 5 are provided in a juxtaposed manner so as to protrude downward. The iron 5 has a flat distal end surface 51 corresponding to the size of the hole to be formed, and the distal end surface 51 is heated to 450 ° C. to 480 ° C. by the heater 52. In addition, two press rods 6 are provided in parallel on the rear side of the lower surface of the support plate 4 so as to protrude downward. A tip end surface 51 of the iron 5 is attached to a tip end of the pressing rod 6.
A pressing surface 61 that is larger than a flat surface and an insertion protrusion 62 that protrudes from the center of the pressing surface 61 and has a cross-sectional shape substantially equal to the tip end surface 51 of the iron 5 are formed.

On the other hand, at a position corresponding to the iron 5 on the base 1, a holder 7 for holding a strap belt for forming a hole.
Are arranged. As shown in FIG. 2, the holder 7 has a guide groove 71a on its upper surface extending to both ends in the left-right direction.
And a slide pedestal 72 slidably disposed in the guide groove 71a and having a flat upper surface. A frame portion 73 is provided on the upper surface of the holder main body 71 so as to position two strap belts placed in a direction crossing the slide pedestal 72. The holder base 71 is provided on the slide base 72.
A pin 74 projecting into a concave portion 71b formed on the bottom surface of the guide groove 71a is mounted. A compression spring 75 for pressing the pin 74 is provided in the concave portion 71b, whereby the slide pedestal 72 is constantly urged leftward in the drawing, and the left end portion thereof projects from the guide groove 71a. Has become. When the strap belt is placed in the frame portion 73 in this state, the placing surface 72 on the slide pedestal 72
A copper plate having a high thermal conductivity is planted in a portion a. As shown in FIG. 3, the slide pedestal 72 is moved by a predetermined amount to the right against the urging force of the compression spring 75 by the operation of an actuator (not shown) disposed on the left end side thereof. I have. When the slide pedestal 72 moves a predetermined amount to the right in this manner, the frame 7
3 and a support surface 7 corresponding to the strap belt
2b, and an insertion hole 72c penetrating vertically is formed at the center of the support surface 72b.

Next, a case in which a hole is formed in the strap belt by using the apparatus configured as described above is shown in FIG.
To (h) and FIGS. 5 (a) to 5 (d). First, when the holder 7 is in the state shown in FIG. 2, the portion where the hole of the strap belt W is to be formed is positioned on the placement surface 72 a of the slide pedestal 72, and the two strap belts W are placed in the frame portion 73. Then, a hole opening step is started (FIG. 4A). Then, the iron 5 located above each mounting surface 72 a is lowered together with the support plate 4 by driving the second air cylinder 41 (FIG. 4B), and the tip end surface 51 of the iron 5 heated by the heater 52 is removed. Strap belt W
(FIG. 4C). As a result, the resin fibers of the strap belt W, which are pressed and heated between the flat mounting surface 72a and the tip end surface 51 of the iron 5, are melted into a thin film (FIG. 4D) and further heated. This dissolves the thin film (FIG. 4 (e)), and the strap belt W
A hole which is substantially the same as the tip surface 51 of the iron 5 is opened. At this time, the resin fiber near the tip of the iron 5 melts and remains around the opening hole to form a burr B.
Is the strap belt W because the mounting surface 72a is flat.
It does not occur on the back side of. Moreover, the strap belt W
Since the burr B formed by the molten resin on the surface side of the surface does not include the resin corresponding to the hole, the height of the burr B does not increase. After a lapse of a predetermined time, the iron 5 is raised together with the support plate 4 by driving the second air cylinder 41 (FIGS. 4F to 4H), and the hole opening step is completed. In doing so, the slide pedestal 72 is slid by the operation of the actuator so that the insertion hole 72c of the support surface 72b and the opening hole of the strap belt W are aligned. Then, the movable base 3 is moved to the front side by the driving of the first air cylinder 31 so that each press rod 6 is aligned with the opening hole and the insertion hole 72c at the respective upper positions (FIG. 5A).

In this state, each press rod 6 is lowered together with the support plate 4 by driving the second air cylinder 41, and the insertion projection 62 at the tip thereof is inserted into the opening and the insertion hole 72c (FIG. 5B). ). As the press rod 6 descends, the pressing surface 61 of the press rod 6 presses around the opening of the strap belt W on the support surface 72b (FIG. 5C). Thereby, the burr B remaining around the opening hole in a flexible state is formed on the support surface 72 b of the slide base 72.
And the pressing surface 61 of the press rod 6 and the insertion protrusion 62 squash, and the thickness around the opening hole of the strap belt W becomes substantially uniform. Thereafter, the press rod 6 is moved upward together with the support plate 4 by driving the second air cylinder 41 (FIG. 5).
(D)), the deburring step is completed. In addition, the molten resin of the burrs B crushed around the opening hole is fixed as time passes, so that the resin fibers around the opening hole are prevented from fraying.

As described above, according to the hole forming method of this embodiment, the burr generated around the formed hole is completely removed by continuously performing the hole opening step and the deburring step. be able to. In this embodiment, the example in which the hole opening step and the deburring step are performed by one apparatus has been described. However, it is needless to say that both steps may be performed using separate apparatuses. In this case, the deburring step is preferably performed while the molten resin forming the burr B is flexible after the hole opening step.

[0014]

According to the hole forming method of the present invention, in the hole opening step, the flat tip end surface of the heated iron is pressed against the resin fiber belt mounted on the flat mounting surface to form a portion thereof. Since the holes are opened by melting the resin fibers of the above, the height of the burrs formed by the molten resin remaining around the opening holes can be reduced, and further, in the deburring step, around the opening holes Since the soft molten resin remaining in the hole is crushed by the support surface, the pressing surface, and the insertion protrusion, burrs generated around the formed hole can be completely removed. Therefore, it is possible to prevent the workability from deteriorating due to burrs generated due to the formation of the holes, and it is possible to improve the appearance of the product.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an apparatus used in an embodiment.

FIG. 2 is a cross-sectional view showing a state in which a hole opening step of a holder of the apparatus used in the embodiment is performed.

FIG. 3 is a cross-sectional view showing a state in which a deburring step of a holder of the apparatus used in the embodiment is performed.

4 (a) to 4 (h) are explanatory views showing step by step the hole opening step in the embodiment.

5 (a) to 5 (d) are explanatory views showing stepwise a deburring step in the embodiment.

6 (a) to 6 (g) are explanatory views showing stepwise a conventional hole forming method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 5 ... Iron 51 ... Tip surface 52 ... Heater 6 ... Press rod 61 ... Pressing surface 62 ... Insertion protrusion 7 ... Holder 7
2 ... Slide base 72a ... Placement surface 72b ... Support surface 72c ... Insertion hole B ... Burr W ... Strap belt (resin fiber belt)

Claims (1)

(57) [Claims] 1. A heated iron tip having a flat tip surface corresponding to the size of a hole to be formed, wherein a resin fiber belt is placed on a flat placement surface of a pedestal. A hole opening step of opening a hole by pressing the resin fiber belt on the mounting surface to melt the resin fiber, and a flat support surface having an insertion hole having a size corresponding to the opening hole. A resin fiber belt is placed so that the insertion hole and the opening hole are aligned with each other, and a pressing rod having a flat pressing surface and an insertion protrusion protruding from the pressing surface and matching the insertion hole is provided at the tip. A deburring step of inserting the insertion protrusion into the opening and the insertion hole and crushing the flexible molten resin remaining around the opening with the support surface, the pressing surface, and the insertion protrusion. A method of forming holes in a resin fiber belt.