JPH0919310A - Band structure and band forming method - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if a three-dimensionally shaped decorative member is used, the decorative member does not deform or sink into the band body during molding, and the band structure can be molded well. I will provide a. [Structure] With resin injected from one end in the longitudinal direction,
In the band structure made of synthetic resin insert-molded so that the decorative member 2 is partially exposed and buried, the through hole 5 penetrating in the resin flowing direction is formed in the decorative member 2. Therefore, when the decorative member 2 is placed in the mold 10 and insert-molded, the resin injected into the mold 10 flows through the through holes 5 of the decorative member 2, so that the decorative member is pressed by the resin. 2 does not receive a large resistance, so that it is possible to prevent the decorative member 2 from being deformed or sinking into the band body, and thus, even if the decorative member 2 having a three-dimensional shape is used, it is good. Can be molded into.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band structure used for a wristwatch and the like and a band molding method.

[0002]

2. Description of the Related Art There are wristwatch bands in which a metallic decorative member is insert-molded into a band body made of a soft synthetic resin such as urethane. In bands like this,
When placing a decorative member in the mold and injecting resin, the decorative member is formed into a flat plate shape so that the decorative member does not block the flow of resin, so the band design is restricted and the desired design There was the inconvenience that I could not get the band. Therefore, conventionally, in order to obtain a band of a desired design, it has been considered to form a decorative member into a three-dimensional shape and insert-mold the three-dimensional shaped decorative member into the band body. There is.

[0003]

However, when a three-dimensionally shaped decorative member is insert-molded, the decorative member has a greater resistance due to the injection pressure (the resin injection pressure) than the flat plate-shaped decorative member. Therefore, there is a problem that the decorative member is deformed or sinks into the band body. The present invention has been made in view of the above circumstances. Even when a three-dimensionally shaped decorative member is used, the decorative member is not deformed or sunk into the band body during molding, and is molded well. An object of the present invention is to provide a band structure and a band forming method capable of forming the band structure.

[0004]

According to the first aspect of the present invention,
In a band structure made of synthetic resin insert-molded so that the decorative member is partially exposed and buried by the resin injected from one end in the longitudinal direction, a through hole is formed in the decorative member in the resin flowing direction. It is characterized by having done. In this case, as described in claim 2, in the decorative member, a plurality of decorative pieces are sequentially formed in the longitudinal direction,
It is desirable that a connecting portion that is cut by a bending operation is formed between the decorative pieces. According to the third aspect of the present invention, a decorative member is arranged in a mold for molding the band body so as to be exposed on the surface of the band body after molding, and a resin is injected into the space of the mold. A method of forming a band, wherein a protrusion having a resin inflow side formed into an inclined surface is provided on a surface facing the inner surface of the decorative member of the mold, and the injected molten resin changes the direction on the inclined surface of the protruding portion and the decorative member is formed. It is to let it flow in the direction of.

[0005]

According to the first aspect of the present invention, when the decorative member is arranged in the mold and insert-molded, the resin injected into the mold flows through the through hole formed in the decorative member. Therefore, the decoration member does not receive a large resistance due to the injection pressure of the resin, and therefore it is possible to prevent the decoration member from being deformed or sinking into the band body. However, it can be molded well. In this case, as described in claim 2, if the decorative member sequentially forms a plurality of decorative pieces in the longitudinal direction and forms a connecting portion that is cut by a bending operation between the decorative pieces, The number of parts as a decorative member is small, and moreover, a plurality of decorative pieces can be arranged at once in the mold, resulting in good work efficiency and cost reduction. Since it is cut by the bending operation, it is convenient and can be used satisfactorily. According to the invention as set forth in claim 3, the molten resin injected into the mold at the time of molding changes its flowing direction on the slope of the protrusion of the mold and flows toward the inner surface of the decorative member. Since the decorative member is pressed against the mold by the flowing resin, the decorative member does not deform or sink into the band body, and good molding is possible even with a three-dimensionally shaped decorative member. You can

[0006]

【Example】

[First Embodiment] A first embodiment in which the present invention is applied to a wristwatch band will be described below with reference to FIGS. FIG. 1 is a perspective view of a wristwatch band according to the present invention. This band 1 is formed by insert-molding a metallic decorative member 2 into a synthetic resin band body 3. As shown in FIG. 2, the decorative member 2 is formed into a substantially box shape whose lower side is opened by pressing a metal plate. An elongated hole 4 is provided on the upper surface of the decorative member 2 in a direction orthogonal to the longitudinal direction of the band body 3, and the resin of the band body 3 flows on the front and rear surfaces (left and right surfaces in FIG. 3). A through hole 5 is provided that penetrates in the direction (left and right in FIG. 3). Further, flanges 6 are formed at the lower end portions of the front and rear surfaces and both side surfaces so as to project substantially horizontally toward the outside. The decorative member 2 is
The upper surface is inclined so that the front side (left side in FIG. 3) is higher and the rear side (right side in FIG. 3) is gradually lower.

The band body 3 is made of a soft synthetic resin such as urethane and is formed into a substantially band shape as a whole. The band main body 3 has one end portion (lower left portion in FIG. 1) formed thick and the other portions formed thin. A pin attachment hole 7 into which a pin member for attaching to the band attachment portion of the wristwatch case is inserted is provided at one end of the thick portion. Further, the decorative protrusions 8 are integrally formed at a predetermined interval on the upper surface of the thin portion of the band body 3, and the decorative protrusion 8 and the boundary portion between the thick portion and the thin portion are formed. Adjacent to each other, the decorative member 2 is embedded with its upper part exposed. Further, a molding recess 9 is provided on the lower surface of the band body 3 so as to correspond to the lower side of the decorative member 2.

Next, the case of molding such a band 1 will be described. First, the mold 10 shown in FIG. 3 is prepared. The mold 10 is composed of an upper mold 10a and a lower mold 10b, and the upper mold 10a and the lower mold 10b are overlapped with each other at a parting line PL, and a space (cavity) corresponding to the band 1 is provided inside thereof. 11 is provided, and a gate 12 for injecting resin into the space 11 from the pin attachment hole 7 side of the band body 3 is provided at the left end portion thereof. In this case, the upper surface of the space 11, that is, the upper die 10a
On the inner surface of the, the stepped portion 13 corresponding to the boundary portion between the thick portion and the thin portion, the concave portion 14 corresponding to the decorative projection portion 8 of the band body 3, and the fitting concave portion to which the upper portion of the decorative member 2 is fitted. 15 are formed respectively. In addition, the space 11
On the bottom of the base, that is, on the inner surface of the lower mold 10b, a protrusion 16 corresponding to the molding recess 9 of the band body 3 is formed.
This protruding portion 16 corresponds to the lower side of the fitting concave portion 15,
One side surface of the protruding portion 16, that is, the resin inflow side (gate 1
The side surface (on the second side) is formed as a slope 16a for pouring the inflowing resin toward the fitting recess 15. A slide core 10c for forming the pin mounting hole 7 is slidably provided on the lower mold 10b.

When the band 1 is molded using this mold 10, first, the upper mold 10a and the lower mold 10b are separated from each other and opened, and a fitting recess formed on the inner surface of the upper mold 10a. The upper part of the decorative member 2 is attached to each of the parts 15. In this case,
The left side (gate 12 side) of the upper surface of the decorative member 2 is high and the right side is gradually inclined such that the right side is gradually lowered. After that, when the upper die 10a and the lower die 10b are overlapped with each other at the parting line PL and closed, a space portion 11 is formed inside the die 10, and the front and rear surfaces of the decorative member 2 are the inner surface of the upper die 10a. To approximately the middle of the space portion 11, and the collar portions 6 on the front and rear surfaces and both side surfaces of the decorative member 2 are provided in the space portion 1.
1 is arranged almost horizontally. In this state, the gate 12
When the molten resin is injected into the space 11 of the mold 10 from
The resin injected into the mold 10 abuts on the front and rear surfaces of the decorative member 2. However, since the through holes 5 are formed in the front and rear surfaces to penetrate in the resin flowing direction, the molten resin is filled in the through holes 5. It will flow. For this reason, the decorative member 2 does not receive a large resistance due to the injection pressure (injection pressure) of the resin. Therefore, the decorative member 2 does not deform or sink into the band body 3, so that the band 1 can be satisfactorily molded even if the decorative member 2 having a three-dimensional shape is used.

Further, when the molten resin flows in the mold 10 in this way, the direction of the resin changes due to the sloped surface 16a of the protrusion 16 provided on the bottom surface of the space 11 of the mold 10, whereby the resin flows. Will flow toward the inner surface of the decorative member 2, and the resin that has flowed into presses the decorative member 2 into the fitting recessed portion 15 of the space 11, whereby the decorative member 2 is deformed or is inserted into the band body 3. It can be prevented from sinking and can be molded well. In this case, in particular, the left side of the upper surface of the decorative member 2 (gate 12 side)
Is higher and the right side is lower, the upper surface of the decorative member 2 is slightly inclined, so that the resin whose flow direction is changed by the sloped surface 16a of the protrusion 16 flows into the upper surface of the decorative member 2 at a substantially right angle. Therefore, the upper surface of the decorative member 41 can be reliably pressed against the fitting recess 15 of the mold 10. In the band 1 thus formed, the resin is filled in the through holes 5 provided in the front and rear surfaces of the decorative member 2, so that the decorative member 2 bites into the band body 3 and the decorative member 2 2 can be firmly attached to the band body 3.

[Second Embodiment] Next, a second embodiment in which the present invention is applied to a wristwatch band will be described with reference to FIGS. As shown in FIG. 4, the band 20 is formed by insert-molding a metal decoration member 21 into a band body 22 made of a soft synthetic resin such as urethane. Similar to the first embodiment, the decorative member 21 is formed into a substantially box shape with its lower side opened by pressing a metal plate. The upper surface of the decorative member 21 is formed substantially horizontally. An elongated slot 23 is provided on this upper surface in a direction orthogonal to the longitudinal direction of the band body 22, and front and rear surfaces (left and right surfaces in FIG. 5) are through holes penetrating in the resin flowing direction of the band body 22. 24 are provided respectively. It should be noted that flanges 25 are formed at the lower end portions of the front and rear surfaces and both side surfaces so as to project substantially horizontally toward the outside.

The band main body 22 is formed in a band shape as in the first embodiment, one end portion (lower left in FIG. 4) of which has a large thickness, and the other portions have a small thickness. Has been done. A pin mounting hole 26 into which a pin member for band mounting is inserted is formed at one end of the thick portion.
Is provided. Also, on the upper surface of the thin part,
The decorative member 21 is embedded at a predetermined interval with its upper part exposed. Further, recesses 27 are formed on the upper and lower surfaces of the band body 22 between the respective decorative members 21 so as to correspond to the upper and lower sides, respectively.
A bendable thin portion 28 is formed at a position corresponding to 7.

Next, a case of molding such a band 20 will be described. First, the mold 30 shown in FIG. 5 is prepared. This mold 30 is similar to the first embodiment in that the upper mold 30
a and a lower die 30b, and an upper die 30a and a lower die 3
0b are superposed on the parting line PL, and a space portion 31 corresponding to the band 20 is provided inside the space 0, and the space portion 3 is provided on the left side thereof from the pin mounting hole 26 side of the band body 22.
1 has a structure in which a gate 32 for injecting resin is provided. In this case, on the upper surface of the space portion 31, that is, on the inner surface of the upper mold 30a, the step portion 33 corresponding to the boundary portion between the thick portion and the thin portion of the band main body 22 is formed, and the decoration member 21 is formed. Fitting recesses 34, into which the upper parts are fitted, are formed at predetermined intervals. Further, trapezoidal or inverted trapezoidal protrusions 35 corresponding to the respective recesses 27 are formed on the upper and lower surfaces of the space portion 31, that is, the inner surface of the upper die 30a and the inner surface of the lower die 30b, corresponding to the upper and lower sides. There is. A slide core 30c for forming the pin mounting hole 26 is slidably provided on the lower mold 30b.

When the band 20 is molded using this mold 30, first, the upper mold 30a and the lower mold 30b are separated and opened, and the fitting recess formed on the inner surface of the upper mold 30a. 34
The upper part of the decorative member 21 is attached to each of the above. Then, the upper die 30a and the lower die 30b are separated from each other by the parting line PL.
And overlap to close. As a result, the space 31 is formed inside the mold 30, the front and rear surfaces of the decorative member 21 are hung from the upper surface of the space 31 almost in the middle, and the front and rear surfaces of the decorative member 21 and the respective side surfaces of the collar are provided. Part 25 is space 31
It is placed almost horizontally inside. In this state, when the molten resin is injected from the gate 32 into the space 31 of the mold 30, the resin injected into the mold 30 penetrates through the front and rear surfaces of the decorative member 21 as in the first embodiment. Since it flows through the holes 24, the decoration member 21 is affected by the resin injection pressure (injection pressure).
Does not receive a large resistance, and therefore the decorative member 2
It is possible to prevent 1 from being deformed or sinking into the band body 22, and the band 20 can be molded well.

The band 2 formed in this way
In 0, the protrusions 35 provided corresponding to the upper and lower surfaces of the space 31 of the mold 30 form the recesses 27 in the band main body 22 between the decorative members 21 in a vertically corresponding manner. Since the bendable thin portion 28 is formed on the band body 22 by 27, the band body 22 can be easily bent by the thin portion 28. Therefore, even if the band main body 22 is bent, stress due to bending is not concentrated on the boundary portion 36 between the upper portion of the decorative member 21 and the band main body 22, so that no gap is generated at the boundary portion 36 due to bending. For this reason, a product excellent in design can be obtained.

[Third Embodiment] A third embodiment in which the present invention is applied to a wristwatch band will now be described with reference to FIGS. 7 and 8. In this case, the same parts as those of the second embodiment shown in FIGS. 4 to 6 are designated by the same reference numerals and the description thereof will be omitted. The decorative member 41 of this band 40 is shown in FIG.
As shown in FIG. 7, a plurality of decorative pieces 42 are sequentially formed in the longitudinal direction of the band body 22 by pressing a metal plate, and the connecting portions 43 cut between the decorative pieces 42 by a bending operation are formed. It has a formed structure. Decorative piece 4
Similar to the second embodiment, 2 is formed in a substantially box shape with the lower side open, and an elongated hole 23 is provided on the upper surface thereof.
Through holes 24 are formed in the front and rear surfaces (left and right surfaces in FIG. 7) of the band body 22 in the resin flowing direction. Collar portions 25 are formed at the lower end portions of the front and rear surfaces so as to project substantially horizontally in the front-rear direction, and the collar portions 25 are sequentially connected by a connecting portion 43 that is cut by a bending operation. Further, in the band main body 22, as in the second embodiment, the concave portions 27 are formed in the upper and lower surfaces of the band main body 22 between the respective decorative members 41 so as to correspond to the upper and lower sides, and are bent at the portions corresponding to the upper and lower concave portions 27. It has a structure in which a freely thin portion 28 is formed.

When molding such a band 40, a mold 30 similar to that of the second embodiment is prepared, and the upper mold 30 is prepared.
The decorative pieces 42 of the decorative member 41 are mounted in the fitting recesses 34 formed on the inner surface of a. In this case, each decorative piece 42
Are sequentially connected by the connecting portion 43, the decorative pieces 42 can be mounted in the mold 30 at one time. Therefore, the work efficiency is good, the number of parts as the decoration member 41 can be significantly reduced, and the price of the product can be reduced. Then, when the upper die 30a and the lower die 30b are superposed and closed, the space portion 31 is formed inside the die 30 and the front and rear surfaces of the decorative member 41 are the same as the second embodiment. It is hung from the upper surface almost in the middle, and the collar portions 25 on the front and rear surfaces and both side surfaces of the decorative member 41 are formed in the space portion 31.
It is placed almost horizontally inside. Therefore, when the molten resin is injected from the gate 32 into the space 31 of the mold 30 in this state, the resin injected into the mold 30 is formed on the front and rear surfaces of the decorative member 41 as in the second embodiment. Since the resin flows through the through holes 24, the decoration member 41 does not receive a large resistance due to the injection pressure (injection pressure) of the resin, and the decoration member 4
It is possible to prevent 1 from being deformed or sinking into the band body 22, and the band 40 can be molded well.

The band 4 formed in this way
At 0, the thin portion 28 of the band body 22 causes the band body 22 to
By bending, the connecting portions 43 of the decorative member 41 are bent and cut in accordance with this bending operation. Therefore, even if the decorative pieces 42 of the decorative member 41 are connected at the time of molding, they are separated at the time of use. Can be made. For this reason, the band 40 can be easily bent and is easy to use, and, like the second embodiment, no gap is formed at the boundary portion 36 between the upper portion of each decorative piece 42 and the band body 41. As a product, a product with excellent design can be obtained.

In each of the above-mentioned embodiments, the case where the present invention is applied to the wristwatch band has been described, but the present invention is not limited to this and can be widely applied to other bands such as clothes belts.

[0020]

As described above, according to the first aspect of the invention, when the decorative member is placed in the mold and insert-molded, the resin injected into the mold is the decorative member. Since it flows through the through-hole, the decorative member does not receive a large resistance due to the injection pressure of the resin, so that it is possible to prevent the decorative member from deforming or sinking into the band body, and the three-dimensional shape Even if the above decorative member is used, it can be molded well. According to the invention described in claim 3,
The molten resin injected into the mold at the time of molding changes the resin flow direction on the slope of the protruding part of the mold and flows toward the inner surface of the decorative member, and the decorative member is pressed against the mold by the flowing resin. Therefore, the decorative member is not deformed or sunk into the band body, and the decorative member having a three-dimensional shape can be favorably molded.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an essential part of a first embodiment in which the present invention is applied to a wristwatch band.

FIG. 2 is a perspective view of the decorative member of FIG.

FIG. 3 is a cross-sectional view showing a state in which the band shown in FIG. 1 is molded by a mold.

FIG. 4 is an external perspective view of the essential parts of a second embodiment in which the present invention is applied to a wristwatch band.

5 is a cross-sectional view showing a state where the band shown in FIG. 4 is molded by a mold.

FIG. 6 is a cross-sectional view of a main part of the molded band when it is used.

FIG. 7 is a cross-sectional view showing a state where a band of a third embodiment in which the present invention is applied to a wristwatch band is molded by a mold.

FIG. 8 is an enlarged cross-sectional view of a main part of the molded band.

[Explanation of symbols]

 1, 20, 40 Bands 2, 21, 41 Decorative member 3, 22 Band body 5, 24 Through hole 10, 30 Mold 11, 31 Space part 15 Fitting concave part 16 Projection part 16a Slope 42 Decorative piece 43 Connecting part

Claims (3)

[Claims] 1. A band structure made of synthetic resin, which is insert-molded so that a decorative member is partially exposed and buried by a resin injected from one end in the longitudinal direction, wherein the decorative member is made of the resin. A band structure characterized in that a through hole is formed so as to penetrate in the flowing direction. 2. The decorative member is characterized in that a plurality of decorative pieces are sequentially formed in a longitudinal direction and a connecting portion is formed between the plurality of decorative pieces to be cut by a bending operation. The band structure according to claim 1. 3. A band formed by arranging a decorative member in a mold for molding the band main body so as to be exposed on the surface of the band main body after molding, and injecting a resin into the space of the mold. A method, wherein a protrusion having a resin inflow side formed on a slope is provided on a surface of the mold facing the inner surface of the decorative member, and the injected molten resin changes direction on the slope of the protrusion and the decoration is performed. A method of forming a band, characterized in that the band is made to flow in the direction of the member.