JPH05285894A - Hole forming method of belt made of resin fiber - Google Patents

Abstract

PURPOSE:To make removal of burrs round a hole completely possible by pressing a heating iron against a belt made of resin fiber placed on a flat mounting surface, and crushing the molten resin round an open hole with a pressing surface and a penetrating projection part after melting the resin fiber on the abutting part to open a hole. CONSTITUTION:In case of forming a hole on a strap belt (W), after the belt (W) is placed on the mounting surface 72a of a slide seating 72 in a holder 7 first, an iron 5 is lowered by a cylinder, the top end surface 51 of the iron 5 heated by a heater 52 is pressed against the belt (W), thereby the resin fiber on the belt part pressed by the iron 5 is melted and a hole is opened, the resin fiber on the part near the top end part of the iron 5 is melted and remains as burrs (B) round an open none. Next, after the iron is raised then, the open hole of the belt is aligned with the through-hole 72c of a supporting surface 72b, and after that, a press rod 6 is lowered, the molten resin round the open hole is crushed by a pressing surface 61 and a penetrating projecting part 62 to remove burrs (B).

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 forming a hole in a belt made of a resin fiber such as polyester fiber (hereinafter simply referred to as a belt), in order to prevent the fibers around the formed hole from being frayed, an acute angle is formed. A method is employed in which a heated trowel having a pointed tip is passed through the belt to form a hole and at the same time, melted fiber resin is welded around the hole. In this method, as shown in FIGS. 6A to 6G, the belt W is mounted on the mounting surface 82A of the pedestal 82 having the insertion hole 82B through which the tip of the trowel 5A can be inserted, and the heater 52A is used to mount the belt W. Insert the insertion hole 8 into the tip of the heated iron 5A.
Insert toward 2B. As a result, the tip of the trowel 5A penetrates the belt W and a hole is formed in the belt W.

[0003]

However, in the case of forming a hole by the above method, when the tip of the trowel 5A enters the belt W, the resin of the fiber heated and melted by the trowel 5A is applied to the surface side 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 surface side of the belt W (FIGS. 6D and 6E). In this way, the molten resin that has flowed to both the front and back surfaces of the belt W is
A few seconds after the tip of the iron 5A is pulled out, the iron 5A is fixed around the formed hole in a raised state to form a burr B. In particular, the burr B formed on the surface side of the belt W
When the tip of the trowel 5A is pulled out, the molten resin is pulled and rises, and the height of the burr B becomes extremely high (FIGS. 6F and 6G). When such a burr B is formed on the belt W, there is a problem in that the insertion work becomes difficult in the step of inserting the belt W into the belt mounting hole of an accessory or the like thereafter, and the workability deteriorates. Further, there is a problem that the formed burr B makes the appearance of the product poor.

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

[0005]

In order to solve the above-mentioned problems, the present invention mounts a resin fiber belt on a flat mounting surface of a pedestal and forms a flat surface corresponding to the size of a hole to be formed. Corresponding to the hole opening step of opening the hole by melting the resin fiber by pressing the tip surface of the heated trowel having the tip surface of The resin fiber belt is placed on the flat support surface having the insertion hole of a size corresponding to the insertion hole and the opening hole, and the flat pressing surface at the tip and the insertion from the pressing surface protruding from the flat surface. A flexible molten resin remaining around the opening hole by inserting the insertion protrusion into the opening hole and the insertion hole with a press rod having an insertion protrusion that matches the hole, the support surface, 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 the resin fiber belt placed on the flat placement surface. That is, the resin fiber of the belt pressed between the flat mounting surface of the pedestal and the flat tip surface of the trowel is melted by the heat and pressure of the trowel, and a hole is opened in that portion. At this time, the resin fiber near the tip of the trowel melts and remains around the opening hole to form a burr, but this burr does not occur on the back surface side of the belt because the mounting surface is flat. .. Moreover, since the burr formed on the surface side of the belt by the molten resin does not include the resin in the portion corresponding to the hole, the height of the burr does not increase.

Then, 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 flat supporting surface so that the soft molten resin remaining around the opening hole is removed. The support surface, the pressing surface, and the insertion projection are crushed. Thereby, the burr generated around the formed hole is 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 of polyester fiber 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. Prior to performing both steps, this apparatus will be described.

The present apparatus is provided with a wall-shaped base portion 2 which is erected on the base 1 so as to extend in the front-rear direction. The wall-shaped base portion 2 has an upper end portion on the right side which is guided by a guide rail 21 to move the front-rear direction. A movable base 3 is provided that is movable in any direction. This movable base 3
Are driven by the first air cylinder 31. And
On the lower surface side of the movable base portion 3, a support plate 4 that is guided by a pair of left and right guide portions 32 and is vertically movable 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 trowels 5 are provided in parallel so as to project downward. The trowel 5 has a flat tip surface 51 corresponding to the size of the hole to be formed, and the tip surface 51 is heated to 450 ° C. to 480 ° C. by the heater 52. Further, on the rear side of the lower surface of the support plate 4, two press rods 6 are provided in parallel so as to project downward. At the tip of this press rod 6, the tip surface 51 of the iron 5 is
A larger flat pressing surface 61 and an insertion projection 62 having a cross-sectional shape that is protruded from the central portion of the pressing surface 61 and has substantially the same sectional shape as the tip surface 51 of the trowel 5 are formed.

On the other hand, at a position corresponding to the trowel 5 on the base 1, a holder 7 for holding a strap belt forming a hole is formed.
Are arranged. As shown in FIG. 2, the holder 7 has guide grooves 71a extending in the left and right directions on both sides of the upper surface thereof.
And a slide base 72 having a flat upper surface which is slidably disposed in the guide groove 71a. A frame portion 73 is provided on the upper surface of the holder body 71 so as to position the two strap belts placed in the direction intersecting the slide pedestal 72. The slide base 72 has a holder body 71.
A pin 74 protruding into a recess 71b formed on the bottom surface of the guide groove 71a is attached. A compression spring 75 for pressing the pin 74 is provided in the recess 71b, whereby the slide pedestal 72 is constantly urged to the left in the drawing, and the left end of the slide pedestal 72 projects from the guide groove 71a. Is becoming When the strap belt is placed in the frame 73 in this state, the placing surface 72 is placed on the slide base 72.
A copper plate having a high thermal conductivity is planted in the portion a. As shown in FIG. 3, the slide pedestal 72 is configured to move to the right by a predetermined amount against the biasing force of the compression spring 75 by the operation of an actuator (not shown) arranged on the left end side thereof. There is. In this way, when the slide pedestal 72 moves to the right by a predetermined amount, the frame portion 7
The supporting surface 7 corresponding to the strap belt placed inside
2b is located, and an insertion hole 72c is formed in the center of the support surface 72b so as to penetrate in the vertical direction.

Next, FIG. 4 (a) shows a case where a hole is formed in the strap belt by using the apparatus constructed as described above.
(H) and FIGS. 5 (a) to (d) will be described. First, when the holder 7 is in the state shown in FIG. 2, the portion of the strap belt W where the hole is to be formed is positioned on the mounting surface 72a of the slide pedestal 72, and the two strap belts W are mounted in the frame portion 73. Then, the hole opening step is started (FIG. 4A). Then, the iron 5 located above each mounting surface 72a is lowered together with the support plate 4 by driving the second air cylinder 41 (FIG. 4B), and the tip surface 51 of the iron 5 heated by the heater 52 is removed. Strap belt W
(Fig. 4 (c)). 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 surface 51 of the trowel 5, are melted into a thin film (FIG. 4D), and further heated. As a result, the thin film dissolves (Fig. 4 (e)), and the strap belt W
A hole substantially the same as the tip surface 51 of the iron 5 opens. At this time, the resin fiber in the portion near the tip of the trowel 5 melts and remains around the opening hole to form a burr B.
Since the mounting surface 72a is flat, the strap belt W
Does not occur on the back side of. Moreover, the strap belt W
Since the burr B formed of the molten resin on the surface side of the burr does not include the resin of the portion corresponding to the hole, the height of the burr B does not increase. Then, 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. 4 (f) to 4 (h)), and the hole opening step is completed. Next, a deburring step is performed. 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 with each other. Then, the movable base 3 is moved to the front side by driving the first air cylinder 31, and each press rod 6 is aligned with the upper position of the opening hole and the insertion hole 72c (FIG. 5 (a)).

In this state, the second air cylinder 41 is driven to lower each press rod 6 together with the support plate 4, and the insertion protrusion 62 at the tip thereof is inserted into the opening hole and the insertion hole 72c (FIG. 5 (b)). ). As the press rod 6 descends in this manner, the pressing surface 61 of the press rod 6 presses the periphery of the opening hole of the strap belt W on the support surface 72b (FIG. 5 (c)). As a result, the burr B remaining around the opening hole in a flexible state has the support surface 72b of the slide pedestal 72.
And the pressing surface 61 of the press rod 6 and the insertion protrusion 62 are crushed, and the thickness around the opening hole of the strap belt W becomes substantially uniform. After that, the press rod 6 is moved upward together with the support plate 4 by driving the second air cylinder 41 (see FIG.
(D)), the deburring process is completed. Note that the burr B crushed around the opening hole has its molten resin adhered thereto over time, and thus the fraying of the resin fiber around the opening hole is prevented.

As described above, according to the hole forming method of this embodiment, the hole opening step and the deburring step are continuously carried out to completely remove burrs generated around the formed hole. 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, but of course, both steps may be performed by using different apparatuses. In this case, it is preferable that the deburring step be performed while the molten resin forming the burr B is soft after the hole opening step is completed.

[0014]

According to the hole forming method of the present invention, in the hole opening step, the flat tip end surface of the heated trowel is pressed against the resin fiber belt placed on the flat placement surface to form a portion thereof. Since the hole is opened by melting the resin fiber of, the height of the burr formed by the remaining molten resin around the opening hole can be lowered. Since the remaining flexible molten resin is crushed by the support surface, the pressing surface and the insertion protrusion, the burr generated around the formed hole can be completely removed. Therefore, it is possible to prevent the workability from being deteriorated due to the burrs that accompany the formation of the holes and to improve the appearance of the product.

[Brief description of 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 an apparatus used in an example is performed.

FIG. 3 is a cross-sectional view of a state in which a deburring process of the holder of the device used in the embodiment is performed.

4 (a) to 4 (h) are explanatory views showing stepwise a hole opening step in Examples.

5 (a) to 5 (d) are explanatory views showing a deburring process stepwise in Examples (a) to (d).

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

[Explanation of symbols]

5 ... Iron 51 ... Tip surface 52 ... Heater 6 ... Press rod 61 ... Pressing surface 62 ... Insertion projection 7 ... Holder 7
2 ... Slide base 72a ... Mounting surface 72b ... Support surface 72c ... Insertion hole B ... Burr W ... Strap belt (belt made of resin fiber)

Claims (1)

[Claims] 1. A tip of a heated iron having a flat tip surface on which a resin fiber belt is placed on a flat placement surface of a pedestal and corresponding to the size of a hole to be formed. Is pressed against the resin fiber belt on the mounting surface to melt the resin fibers to open a hole, and a flat supporting surface having a through hole of a size corresponding to the hole is formed. A resin fiber belt is placed with the insertion hole and the opening hole aligned with each other, and the press rod has a flat pressing surface at the tip and an insertion projection protruding from the pressing surface and corresponding to the insertion hole. From the deburring step of inserting the insertion protrusion into the opening hole and the insertion hole and crushing the flexible molten resin remaining around the opening hole with the support surface, the pressing surface and the insertion protrusion. A method for forming a hole in a resin fiber belt, comprising: