JPH08182514A - Insert molded band and its production as well as insert metallic piece used for this band - Google Patents

Abstract

PURPOSE: To improve workability, post-workability and durability by forming slit holes at the peripheral walls existing in resin bodies of plural metallic links and forming cut ends facing the outside of the resin bodies at both ends existing in both side parts of the bands of the respective links. CONSTITUTION: The plural ornamental links 22 are connected by a connecting band 23 to an insert metallic piece 21 formed by drawing and slits grooves 24a are inscribed at their supporting parts 24. Further, bent parts 25 are formed between respective positioning holes 23a of the connecting band 23 before the drawing. The peripheral walls of the respective links 22 are bored with rectangular slit holes 22a, 22b. The insert metallic piece 21 is set together with the connecting band 23 into the cavity of metal molds and is molded. The slit grooves 24a of the supporting parts 24 are then bent and disconnected. Consequently, resins are continuous with the slit holes 22a, 22b and, therefore, the detachment of the links 22 from the resin bodies 40 with lapse of time does not arise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band used for a wristwatch or the like, which is an insert molding band formed by inserting a metal piece into a resin body, a method for producing the same, and an insert metal piece used for the insert molding band. It is about.

[0002]

2. Description of the Related Art As a conventional watch band formed by insert molding, there is known a watch band in which a band-shaped mesh is embedded in a resin body, or a metal wire serving as an antenna of a radio-controlled watch is embedded in a resin body of the band. in this way,
In the conventional insert-molded watch band, the purpose of inserting the metal piece into the resin body is to increase the mechanical strength such as tensile strength and bending strength of the band, and to use it as an antenna for catching time-stamping radio waves. Had most of its functional purposes.

In the current resin watch band, the tensile strength and bending strength of the resin body itself have become high enough to withstand long-term use due to the progress of resin material technology. Therefore, in recent insert-molded watch bands, in addition to those having the functional purpose described above, those having a structure mainly aiming at appearance are becoming the mainstream. In insert-molded watch bands intended to improve the appearance of the band, wear resistance, and impact resistance, the insert metal piece is not intended to improve tensile strength and bending strength. It is not a single piece, but is composed of a plurality of pieces of the same shape formed on a concave section by deep drawing a metal plate. Therefore, each metal piece must be set in the mold.

The insert molding in this case will be described with reference to FIG. 1. As is well known, the insert molding is performed by using a mold composed of a fixed mold 1 and a movable mold 2. . Between the fixed mold 1 and the movable mold 2,
A cavity 3 in the shape of a watch band is formed. The metal piece of the insert watch band for the purpose of external appearance projects slightly outward from the surface of the belt-shaped resin body. Therefore, a concave portion (not shown) for installing the metal piece is formed on the inner wall of the cavity 3. As described above, this recess is extremely shallow because the metal piece projects only slightly from the surface of the resin body of the band. Further, a side gate 4 and a runner 5 for flowing a molten resin are formed and communicated with the cavity 3, and a sprue 6 that communicates with the runner 5 and guides the molten resin into the mold is fixed side mold. It is provided in the center of 1. A heating cylinder 7 of the injection molding machine is provided at the outer opening of the sprue 6. A screw 8 for delivering the molten resin is provided in the heating cylinder 7, and an injection nozzle 9 communicating with the sprue 6 of the mold is formed at the tip. Also,
An ejector pin 10 for detaching a molded product from the movable-side mold 2 at the time of release is built in the movable-side mold 2 so as to be retractable.

To mold the insert-molded watch band with the molding machine having the above-described structure, first, the metal piece is placed at a predetermined position in the cavity 3 of the mold. After that, the resin heated and melted in the heating cylinder 7 of the injection molding machine is filled by the screw 8 from the injection nozzle 9 into the cavity 3 through the sprue 6, the runner 5 and the side gate 4 in the mold. Then, after the pressure holding step, the resin in the cavity 3 is cooled and solidified. Next, after the movable side mold 2 is separated from the fixed side mold 1, the molded product (insert molded watch band) in the cavity 3 and the resin in the sprue 6 and the runner 5 are ejected and moved by the ejector pin 10. Separate from the side mold 2. In this way, since the molded product separated from the movable mold 2 is integrally molded with the resin of the sprue part and the runner part, the molded product is manually molded by using a hot nipper or the like. An insert-molded watch band is obtained by cutting between the sprue and the resin.

[0006]

By the way, in the above-mentioned conventional insert-molded timepiece band, when manufacturing it,
Since a plurality of metal pieces have to be set in the mold one by one, the workability is poor, and there is a drawback that the manufacturing cost rises. Further, as described above, since the place where a plurality of metal pieces are set is also a very shallow recess formed on the inner surface of the cavity, the metal piece is easy to move, and when the resin is injected into the cavity, the flow of the resin flows. There was also a case where the product was moved and became a defective product. Moreover, the insert metal piece is an individual piece having a concave cross section, and the opening side is buried in the resin body to expose the bottom surface on the closing side, so that there is no bite between the resin body and the metal piece. There was also a problem in durability that the metal piece was weak and detached from the resin body over time. Furthermore, post-processing also requires the use of nippers, which is a bottleneck in reducing man-hours. The present invention has been made in view of the above circumstances, and an insert molding band having improved workability, post-processability, and durability, and a method for manufacturing the same.
Another object of the present invention is to provide an insert metal piece used for the insert molding band.

[0007]

According to the present invention, in order to achieve the above-mentioned object, a plurality of pieces are arranged and both sides thereof are integrally connected by connecting strips. The insert metal piece was made by drawing a single plate material by making it easy to cut and separate.
Further, a slit hole is provided to improve the biting between each piece and the resin main body, and a positioning hole is finally formed in the above-mentioned connecting band which is not necessary to ensure the positioning of the decorative piece with respect to the insert molding die. Further, in the insert metal piece, unnecessary portions between the respective pieces are bent for deep drawing to secure a wall thickness, and further, each piece and the connecting band for connecting these can be easily separated after insert molding. It is characterized in that a slit groove is provided.

That is, the insert-molded band according to claim 1 is an insert-molded band which is insert-molded in a state where a plurality of metal decorative pieces are partially exposed and embedded in a resin body of the band. Slit holes are formed in the peripheral wall of the resin main body of the plurality of pieces, and cut ends desired outside the resin main body are formed inside the resin main body at both ends located on both sides of the band of each piece. It is a feature.

Further, the insert metal piece according to claim 2 is an integrally formed insert metal piece by deep drawing press working used for an insert molding band,
A plurality of decorative pieces are arranged, and these pieces are integrally connected to each other by connecting strips on both sides thereof, and the above-mentioned pieces and the connecting strips are connected to each other via strip-shaped supporting portions, and the inserts are inserted in the supporting portions. It is characterized in that slit grooves are formed so as to facilitate the cutting and separation of each piece and the connecting strip after molding.

Further, the insert metal piece according to claim 3 is the insert metal piece according to claim 2, wherein the peripheral wall of each piece is provided with a slit hole for enhancing the biting of the resin when it is inserted into the resin body. The insert metal piece according to claim 4 is the insert metal piece according to claim 2 or 3, wherein the insert metal piece is located at a position corresponding to each piece of the connecting band during insert molding. The molding die is provided with a positioning hole for positioning the insert metal piece.

The insert metal piece according to claim 5 is the insert metal piece according to any one of claims 2 to 4, wherein the insert metal piece is pressed between the positioning holes of the connecting band. It is characterized in that a bent portion is formed to prevent the above-mentioned piece from becoming thin during processing.

According to a sixth aspect of the present invention, there is provided a method of manufacturing an insert-molded band, which is insert-molded in a state where a plurality of metal decorative pieces are partially exposed and embedded in a resin main body of the band, A plurality of pieces are arranged, both sides of which are integrally connected by connecting bands, and an insert metal piece configured to easily cut and separate this connecting band and each piece is set in the cavity of the insert mold. After the resin is poured into the cavity, cooled and solidified, the molded product is separated from the mold, and the connecting band is cut and separated from the separated molded product.

Further, according to a seventh aspect of the present invention, in the method for producing the insert molding band according to the sixth aspect, slit holes are formed in the peripheral wall of each piece of the insert metal piece, and the cavity is formed. The method for producing an insert-molded band according to claim 8 is characterized by increasing the biting between the resin body and each piece after the resin is poured into the inside, cooled, and solidified. In the manufacturing method according to 6 or 7, a positioning hole is formed at a position corresponding to each piece of the connecting band of the insert metal piece, and the insert metal piece is positioned in a molding die during insert molding using the positioning hole. It is characterized by doing.

[0014]

In the present invention having the above-mentioned structure, the insert metal piece is made by squeezing a single plate material, the cost is lower than that of making the pieces one by one, and since the insert molding is completed, it is integrated. It can be easily set in the mold, and since there is a slit groove between the part that is not needed after insert molding and the decorative piece, it can be separated by bending it, so post processing is also easy. Further, since the slit hole is formed in the peripheral wall of each piece, the metal piece and the resin body are strongly bitten with each other, and the piece does not come off from the resin body with time, and the durability is high. Furthermore, even if the pieces that make up the insert metal piece have different shapes, the metal piece can be molded at once from a single plate material, so only one molding die is required and there is no change in cost. Can handle.

[0015]

An embodiment of the present invention will be described below.
2 is a plan view of an insert metal piece used for an insert-molded watch band to which the present invention is applied, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is I of FIG.
It is sectional drawing which follows the V-IV line. The insert metal piece 21 is formed by a well-known drawing process of a single plate material, and a plurality of insert metal pieces 21 are arranged at equal intervals (in the figure, 23
Each of the decorative pieces 22 has a structure in which both sides thereof are integrally connected by connecting bands 23. Here, the plurality of pieces 22 correspond to individual insert metal pieces of the related art, and the arrangement interval of these pieces 22 is set to the arrangement interval when the pieces are inserted into the resin body of the insert molded watch band. ing. Moreover, the individual pieces 22 are not directly connected to each other, and as described above,
The structure is such that they are connected via 3. Each piece 22 and the connecting bands 23 on both sides are connected by a strip-shaped support portion 24, and a slit groove 24a is formed in the support portion 24.

A positioning hole 23a is formed in the central portion of the connecting band 23 corresponding to each of the supporting portions 24. That is, since the connecting band 23 is provided with the positioning holes 23a at the positions corresponding to the respective pieces 22, in the example shown in the figure, the connecting band 23 on each side has 23 positioning holes 23a. It will be. Further, between the respective positioning holes 23a of the connecting band 23, a bent portion 25 standing upright to the plane of the connecting band 23 is formed. The bent portion 25 is a remnant formed before the insert metal piece 21 is drawn from a single plate material to prevent the pieces 22 from becoming thin during deep drawing press working. That is, this bent portion 5
Is bent in such a manner that the space between the parts forming each piece 22 is raised in one plate material, and then each piece 22 is formed by deep drawing press work, and at the same time, the space between the pieces 22 is supported. This is a thinning preventing portion during processing that remains in the connecting band 23 after cutting and removing, leaving the portion 24 and the connecting band 23. This is because, as shown in FIG. 4, in each piece 22, the gap p between the pieces 22 is smaller than the drawing height h, and drawing processing cannot be performed as it is. Therefore, unnecessary portions between the pieces 22 are bent (drawing). It was done. Each of the pieces 22 is a rectangular parallelepiped having a shallow bottom, and rectangular slit holes 22a and 22b are formed in the peripheral walls thereof. These slit holes 22a, 22b are formed by molding the insert metal piece 21 from a single plate material.
It is formed by cutting out after or just before forming the bent portion.

In insert injection molding using the insert metal piece 21 having the above structure, first, the insert metal piece 21 is set in the band-shaped mold cavity 30 as shown in FIG. At this time, the connecting band 23 is set so as to be sandwiched between a fixed-side mold and a movable-side mold (not shown), and the positioning hole 23a of the connecting band 23 engages with a positioning pin formed on one mold. This ensures that the metal piece is positioned within the cavity. After the mold is set in this way, resin is poured into the cavity, cooled and solidified, and then the molded product is separated from the mold.
An insert-molded watch band having a structure in which 2 is buried is created. In this state, the connecting band 23 and a part of the supporting portion 24 are still attached, and since these are unnecessary portions for the product, the slit groove 24a of the supporting portion 24 is bent and separated. Then, since the engraved position of the slit groove 24a is set to be located slightly inward from the outer surface of the resin body 40, as shown in FIG.
An insert-molded watch band having a beautiful appearance with no protrusion from the resin body 40 other than the decorative piece 22 is completed.

In this way, as a result of observing the insert-molded watch band that has been insert-molded, post-processed and completed as a product, a slit hole is formed in the peripheral wall in the resin main body of the plurality of pieces. It is characterized in that cut ends desired to the outside of the resin body are formed inside the resin body at both ends of each formed piece located on both sides of the band. In the above manufacturing method, the portion (support portion 24) separated by the post-processing is also dangerous because edges and burrs are usually generated, but in this structure, the separated portion is the resin as described above. Since it is inside the main body 40, it is safe without being directly touched by the hand.

As described above, slit holes 22a and 22b are formed in the peripheral wall of the decorative piece 22 which is embedded in the resin body 40, and the resin is continuously formed in these holes. Therefore, the biting between the piece 22 and the resin main body 40 is very high, and the piece 22 does not come off from the resin main body 40 over time. Compared to the conventional insert metal piece which is divided one by one from the time of molding, since it is integrated until the molding is completed in the present invention, it is easy to set the metal piece in the mold, The workability can be greatly improved and the cost can be considerably reduced.

The characteristics of the insert metal piece used in the present invention are as follows. (I) Since a higher dimensional accuracy is required at the time of injection molding than at the time of press working, the positioning hole 23 for compensating for it is required.
a is provided. (Ii) Slit holes 22a and 22b are provided in order to improve biting with the resin. (Iii) Compared to the diaphragm height h in each piece 22, the piece 22
Since the gap p is small and cannot be drawn as it is, unnecessary portions between the pieces 22 are bent (drawn) (bent portion 25) (FIG. 4). (Iv) After insert molding, slit grooves 24a are formed so that unnecessary portions of the insert metal piece (the connecting band 23 and the supporting portion 24) can be easily separated.

[0021]

As described above, in the present invention, the insert metal piece is made by squeezing a single plate material, and the cost is lower than that of making one piece at a time, and the insert metal piece is integrated until the completion of insert molding. Since it is easy to set in the mold, there is a slit groove between the unnecessary part after insert molding and the decorative piece, so it can be separated by bending it, so post processing is also easy. is there. In addition, since the slit hole is formed in the peripheral wall of each piece, the metal piece and the resin body are strongly bitten,
The piece does not separate from the resin body over time and has high durability. In addition, even if the shape of the pieces that make up the insert metal piece is different one by one, the metal piece can be molded at once from one plate material, so only one molding die is required and there is no change in cost. Can handle.

[Brief description of drawings]

FIG. 1 is a side sectional configuration diagram of a general insert molding die.

FIG. 2 is a plan view showing an insert metal piece used in an embodiment of the present invention.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a perspective view showing a state in which the insert metal piece is set in the cavity of the mold in the embodiment of the present invention.

FIG. 6 is a perspective view showing an insert-molded watch band immediately after insert molding.

FIG. 7 is a perspective view showing an insert-molded watch band that has undergone post-processing.

[Explanation of symbols]

 1 Fixed Side Mold 2 Movable Side Mold 3 Cavity 9 Injection Nozzle 21 Insert Metal Piece 22 Decorative Pieces 22a, 22b Slit Hole 23 Connecting Band 23a Positioning Hole 24 Supporting Section 24a Slit Groove 25 Bending Section 30 Band-shaped Mold Cavity 40 Resin body

Claims (8)

[Claims] 1. An insert-molded band which is insert-molded in a state where a plurality of metal decorative pieces are partially exposed and buried in a resin body of the band, wherein the peripheral wall is inside the resin body of the plurality of pieces. An insert-molded band, wherein slit holes are formed in each of the pieces, and cut ends desired outside the resin main body are formed inside the resin main body at both ends located on both sides of the band of each piece. 2. A one-piece insert metal piece formed by deep drawing used for an insert molding band, which is insert-molded in a state where a plurality of metal decorative pieces are partially exposed and embedded in a resin main body of the band. A plurality of decorative pieces are arranged, and these pieces are integrally connected to each other by connecting strips on both sides thereof. The above-mentioned pieces and the connecting strips are connected to each other via strip-shaped supporting portions, and The insert metal piece is characterized in that the insert metal piece is provided with slit grooves for facilitating cutting and separation of each piece and the connecting band after insert molding. 3. The insert metal piece according to claim 2, wherein the peripheral wall of each piece is provided with a slit hole that enhances the biting of the resin when it is inserted into the resin body. 4. A positioning hole for positioning the insert metal piece in a molding die at the time of insert molding at a position corresponding to each piece of the connecting band. The insert metal piece according to item 3. 5. A bent portion is formed between each of the positioning holes of the connecting band so as to prevent the piece from becoming thin when the insert metal piece is pressed. The insert metal piece according to any one of 2 to 4. 6. A method for manufacturing an insert-molded band, wherein a plurality of metal decorative pieces are partially exposed and embedded in a resin main body of the band and insert-molded, wherein a plurality of pieces are arranged. Both sides are integrally connected by a connecting band, and the insert metal piece configured to easily cut and separate the connecting band and each piece is set in the cavity of the insert mold, and the resin is set in the cavity. After pouring, cooling and solidifying,
A method for producing an insert band, which comprises separating a molded product from a mold, and cutting and separating the connecting band from the separated molded product. 7. A slit hole is formed in the peripheral wall of each piece of the insert metal piece to enhance the biting between the resin body and each piece after the resin is poured into the cavity and cooled and solidified. The method for producing an insert-molded band according to claim 6, wherein. . 8. A positioning hole is formed at a position corresponding to each piece of the connecting band of the insert metal piece, and the positioning hole is used to position the insert metal piece in a molding die during insert molding. The method for manufacturing an insert-molded band according to claim 6 or 7.