JPH0371158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fusing beads on the epidermis that can easily form beads or bead-like projections of the same color, different colors, different fabrics, the same fabric, etc. on the epidermis.

BACKGROUND OF THE INVENTION Tamabuchi is often used as a rim on the skin of seats, bags, trunks, and other bags.

Conventionally, this bead has been manufactured as shown in FIG. 3 rather than in FIG. 1, and is widely used.

Figure 1 shows an example, 1A and 1B are the epidermis,
2 is urethane foam or other wading (filling material), 3 is back base fabric, and the thing consisting of these three layers is called a trim cover.
There is also a case where only B is used, and a case where back base fabric 3 is adhered to the outer skins 1A and 1B.

The beads are made by wrapping a string-like ball core 4 with a ball core skin 5 and then sewing it with a sewing machine or heating and fusing it with a high-frequency device.
Alternatively, for vinyl chloride, etc., it is molded integrally and made separately.

To attach the bead between the skins 1A and 1B, insert the bead between both ends of the skins 1A and 1B,
The dotted line part a is sewn with a sewing machine or heat-fused with a high-frequency device or the like. Both FIG. 1 and FIG. 2 are shown with the epidermis 1A, 1B facing down in relation to the embodiments of the present invention described later.

FIG. 2 shows another conventional example, with epidermis 1A and 1B.
The ball cores 4 are interposed between them, and the ball cores 4 are sewn at the dotted line portions a on both sides of the ball cores 4 by sewing with a sewing machine or are heat-fused using a high-frequency device or the like.

FIG. 3 shows an outline of the high-frequency device. Reference numeral 7 denotes a heat-fusion upper mold which heats the materials to be welded to an appropriate degree depending on the material, which descends during the welding operation and rises when the welding operation is completed.
8 is a welding lower mold, which has a protruding pressing part 8b, which inserts the trim cover in the dotted line arrow and presses the welded part (dotted line part a in Figs. 1 and 2) during heat welding. .

The method shown in Figure 1 requires the purchase of a separate product, the need for skill to sew it in, and the number of man-hours required. Since it is exposed, it has a defect that makes it undesirable in terms of appearance as a product. Furthermore, it is difficult to form a bead without a bead core.

The present invention was devised in view of the shortcomings of the conventional manufacturing method, and uses elongated ball core skins (different colors and materials are available), places the ball core skins in a fusing device, and fuses them together. This method heat-fuses the core and the outer skin, and the core outer skin becomes rounded, making it possible to easily create well-shaped and low-cost beads on the skin, similar to conventional sewing machines. It seeks to provide law.

Next, the ball-shaped fusion molding method of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 4a and 4b are longitudinal sectional views of the fusion equipment of the first embodiment of the present manufacturing method, and FIG. 4c is a sectional view of the product.

In Figures 4a and 4b, we will first explain the fusion equipment. 7 is a heating fusion upper mold, which melts the materials to be fused during fusion using high frequency current, electric heater, steam, fluid, ultrasonic waves, etc. Heat to an appropriate temperature. If the upper mold 7 does not have a heating device (not shown), it may be heated with a flame of gas or the like in addition to the above in the pre-fusion step. This heat-sealing upper mold 7 is made vertically movable as shown by the arrow.

A horizontally long protruding part 8c is fixed to the lower welding mold 8 to accommodate the long bead, and has a vertically long hole 12 on both sides of the protruding part 8c. A presser welding mold 8 having an L-shaped cross section and biased is provided so as to be movable up and down symmetrically, and the upper end of the protrusion 8c and the presser welding mold 9A,
9A, a slightly rectangular long groove portion 9a is formed.

Prior to welding, first, the ball core skin 5 is inserted into the long groove portion 9a of the presser welding mold 9A.

A trim cover is attached between the top of the presser fusion mold 9A and the heat fusion upper mold 7 with the skin 1A facing down. In this case, either one of the upper mold 7 and the lower mold 8 for heat-sealing may be shifted, and the object to be welded may be moved to a fixed position after the device is applied.

Next, the heat-sealing lower mold 7 is lowered and brought into contact with the back base fabric 3 as shown in FIG. 4b to heat the trim cover, and the lower mold 7 is further lowered.
The presser welding mold 9A is also pushed downward, and the rolled-up parts 5b on both sides of the ball core skin 5 are also pushed from above, so when the depth of the long groove part 9a becomes shallow, the rolled-up parts 5b of the ball core skin 5 are pushed down. become rolled up inside each other, form a ball, and are fused to the epidermis 1A. At this time, the presser fusion molds 9A and 9A are attached to the spring 1.
Since it is biased to 0, due to the buffering effect,
By being pressed in a double dynamic manner, the ball core skin 5 can be well rolled up, and the fused portion will not become thin or break.

A product produced by the fusion molding method of the present invention is shown in FIG. 4c. In this figure, the ball core skin 5 is completely rolled up, but in reality it may be crushed and fused, but since it is not visible from the front side, it appears to be fused in a rounded state. This ball core epidermis 5 is epidermis 1
It may be the same fabric as A, or it may be accented with another skin of a different color or material.

The welding device shown in FIG. 4b is used to make the bead completely round, and the lower surface of the heat-welding upper die 7 is provided with a convex portion 7a having an arc-shaped concave portion 7b at the end. The presser welding molds 9B, 9B are fixed to the upper part of the lower welding mold 8, and their upper ends form curved portions 9d that are rounded inward from each other. In addition, presser foot fusion type 9B,
A hole is made in the lower part of 9B for the wedge 11 to move laterally, and between the presser welding molds 9B and 9B is a pressing part 8 which is long in the horizontal direction and has a concave upper part.
b is interposed so as to move up and down as the wedge 11 is put in and taken out, and forms a round long groove part 9b with the concave surface having an arcuate cross section at the upper end of the bending part 9d of the presser welding mold 9B and the characteristic part 8b. It is configured as follows. Although the upper end of the protrusion 8c is flat in FIGS. 4a and 4b, it may be a concave surface with an arcuate cross section.

The arrangement of the ball core skin 5 and the trim cover is the same as in the previous embodiment, and during welding, the heat welding upper die 7 descends as it is heated, and the plurality of wedges 11 are placed at the same time.
moves to the left side and pushes up the pressing part 8b with the inclined surface of the upper surface, so that a bead is fused and formed into a perfect round shape on the skin.

Although the wedge 11 is shown in the figure, the present invention is not limited to this, and a mechanism for raising the pressing portion 8b, such as a cam or a rack and pinion, may be used.

FIG. 4e shows a cross section of another fusion device, in which a horizontally long presser fusion mold 9D with an L-shaped cross section is placed on the lower fusion mold 8;
9D are symmetrically provided so as to be movable laterally in the direction of the arrow. There is a bent part 9b on the upper inner side, and both sides are joined to form a round long groove part 9c.

The process order of the bead molding is the same as that of the previous embodiment, so the description thereof will be omitted.

Fig. 4f shows a state in which the upper die 7 is lowered in Fig. 4a by using vinyl leather or a hard knitted fabric for the ball core skin 5, and both ends 5b of the ball core skin 5 are pushed from above. It shows a curved shape that buckles inward.

Figure 11 shows the upper mold 7 in the explanation of Figure 4f above.
shows a product in which the ball core skin 5 is bent further and both ends 5b are folded and rolled up.

Next, examples of other products produced by the ball-shaped fusion molding method of the present invention will be described.

The embodiment of FIG. 5a differs from FIG. 4c in that the epidermis 1A
This embodiment is divided into two types, 1A and 1B, and the ends of the skins 1A and 1B are overlapped and placed in the long grooves 9a, 9b, and 9c, and the beads are fusion-molded in the same manner as in the previous embodiment. . When this product is used for seats,
Epidermis 1B has a calyx (periphery of the upper surface of the seat), epidermis 1
This can be applied to cases where A is a bending part (center part of the seat), etc. The materials, colors, etc. of the skins 1A and 1B may be different.

In the embodiment of FIG. 5b, the left side of FIG. 5a is the epidermis 1.
The case where only B is used as the gusset part (periphery side part) of the seat is shown. That is, this is an example in which the skin 1A serving as the bending portion and the ball core skin 5 are fused together by heating, and can also be applied to other cases shown in FIGS. 4c and 6 and subsequent figures. This figure shows a cross section, but this means that the skin surface of the actual seat is not only straight parts, but also
It is shown and included here because it may be a curved section. In this figure, the same applies to the following embodiments.

The embodiment shown in FIG. 6 differs from the previous embodiment in that the ball core skin 5 is not used, but the end of the skin 1A is extended and layered with the skin 1B, which is fused and molded by rolling it up. .

In this manufacturing method, the skin 1A is placed in the long groove portion 9a in FIG. 4a.
After inserting the end of the cover 1B and placing the skin 1B thereon, fusion molding was carried out in the same manner as in the above-mentioned process order. In the case of this embodiment, if the right presser welding mold 9A and the spring 11 are abolished as shown in FIGS. 4a and 4b, the sixth
The recessed portion 1b on the right side of the figure will not be molded.

Furthermore, in Fig. 5b, we explained the method of fusing 1B as a gusset part (circumferential part), but although not shown in Fig. 6, only the right skin 1A is used, and the seat It may also be a gusset part (peripheral side part).
In this case, the skin 1A, which has become the gusset, may have a shape that is perpendicular to the calyx or overhangs the seat, so it is cut three-dimensionally in advance, so the edge of the gusset 1A is When inserting into the long groove part 9a of FIG. 4b, the pushing position can be accurately maintained in the long groove part 9a.

Incidentally, it is also possible to stack 1A and 1B and insert them into 9a, then push in the ball core skin 5, and then stack 2 and 3 and fuse them together.

The example of the bead shown in Fig. 7 is different from the bead shown in Fig. 4c, especially when it is desired to make the ball core skin 5 larger, and the ball core skin 5 is made wider and part of it is double-wound and fusion molded. This is what I did.

The embodiment shown in FIG. 8 is a case where a flat feeling is required. In some cases, there is almost no space inside the ball core skin 5.

The embodiment shown in FIG. 9 is formed by partially overlapping the ball core skin 5 shown in FIG. 8 on the inside, and is used when the height of the ball rim shown in FIG. 8 is desired to be slightly higher. In this case as well, there may be almost no space inside the core skin 5.

The embodiment of FIG. 10 is used for the same requirements as FIG. Although not shown in the same way as in the explanation of FIG. 6, the presser welding mold 9 on the right side of FIGS. 4a and 4b
If A and the spring 10 are eliminated, the concave portion 1b on the right side in FIG. 10 will be absent, and the protruding portion 5a shown in FIG. 2 will be rolled inward, and the drawbacks in FIG. 2 will be solved. This is also suitable for bonding the epidermis 1A, 1B and different types of epidermis. Further, there may be cases where there is no space for the folded portion of the skin 1A.

Figure 12 shows a case where a vinyl leather decorative stripe 5 (in the case where there is no ball core 4 using a wide tape-like thing inside the ball core skin 5) is fused to the surface of the skin 1. As in Figure 11, it has a folded and rolled-up shape.

In the above method, if the melting temperatures of the skins 1A, 1B, core skin 5, and wading 2 are different, the material with a higher melting temperature will melt during welding, and the surface of the material with a lower melting temperature will melt too much. If the quality deteriorates due to heating, it is best to prevent the deterioration by cooling the surface of the material with a low melting temperature and air.

Furthermore, when a material that does not fuse with heat is used, another adhesive that melts with heat may be interposed.

The wadding is not limited to various types of urethane, and other materials such as fibrous or cloth-like materials may also be used.

According to the method of the present invention, unlike conventional methods, it does not require man-hours and can be manufactured easily, so it is possible to reduce costs, and it is possible to provide a product with a good appearance and a new design at a low cost.

[Brief explanation of drawings]

Figures 1 to 3 show conventional examples, Figure 1 is a sectional view of one embodiment, Figure 2 is a sectional view of another example, Figure 3 is a schematic diagram of a fusion type, and Figure 4a is a method. FIG. 4b is a sectional view of the fusion device in an activated state, FIG. 4c is a sectional view of the product, and FIGS. 4d and 4e are cross-sectional views of other fusion devices. Fig. 4f is a cross-sectional view of the welding device showing the state in which both ends of the ball core skin are pushed from above and buckled inward while the upper die is descending, and Fig. 5a is a cross-sectional view of the welding device showing the state in which the core skin is bent inward while the upper mold is descending. A cross-sectional view, Figure 5b is a cross-sectional view of another product,
Figure 6 is a cross-sectional view of another product, Figure 7 is a cross-sectional view of an example with a larger diameter bead, Figure 8 is a cross-sectional view of an example with a flat bead, and Figure 9 is a cross-sectional view of an example with a thicker bead. Figure 10 is a cross-sectional view of an example in which a bead is formed on one side of the skin, Figure 11 is a cross-sectional view of an example in which vinyl leather or the like is used for the ball core skin 5, and Figure 12 is a cross-sectional view of an example in which a bead is formed on one side of the skin. FIG. 3 is a cross-sectional view of an example using stripes. 1A, 1B... Outer skin, 1b, 7b, 7c... Concavity, 2... Wading, 3... Back base fabric, 5, 5A
...Ball core skin, 7... Heat-fused upper mold, 7a... Convex part, 8, 8A, 8B... Fusion-lower mold, 8a... Groove, 8b... Pressing part, 8c... Convex Debe, 9A,
9B, 9D... Presser welded part, 9a, 9b, 9c...
...Long groove part, 9d...Bending part, 10...Spring, 11
... Wedge, 12 ... Vertical hole, 13 ... Guide pin.

Claims (1)

[Claims] 1 In a method of fusing and forming a bead or bead-shaped convex part on the skin by heating, a presser welding part facing the lower welding mold and having a long groove part therebetween is movably provided, and when welding, the welding part is movably provided. A ball core skin cut into long strips is attached to the long groove, and is interposed between the heat fusion upper mold and the presser fusion part of the lower fusion mold, with the surface side of the skin facing the presser fusion part. It is characterized in that either the lower mold or the heat-fused upper mold is raised or lowered, and the ball core skin is rolled and pressed by the presser welding mold to form a ball shape without a ball core on the skin. A bead fusion molding method for the epidermis.