JPH0127759B2 - - 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. In FIG. 1, the epidermis 1A, 1
B is shown facing down.

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.

The present invention was devised in view of the shortcomings of the conventional manufacturing method, and uses an elongated ball core skin (different colors and materials are available) and a string-shaped ball core. and the outer skin are heated and fused together in a fusing device, and the outer skin of the ball core wraps around the ball core, creating a well-shaped and low-cost ball shape similar to conventional sewing machines. The purpose of this invention is to provide a method for forming a beaded fusion bond on the epidermis, which can easily create a beaded fusion bond on the epidermis.

Next, the ball-shaped fusion molding method of the present invention will be explained 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 process. 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 die 8 having an L-shaped cross section and biased is provided so as to be movable symmetrically up and down, and the upper end of the protruding portion 8c and the presser welding die 9A,
9A, a slightly rectangular long groove portion 9a is formed.

Prior to fusing, first insert the ball core skin 5 into the long groove 9a of the presser welding mold 9A, then insert the ball core 4 into the long groove 9a.
Put in.

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 the heat-sealing upper mold 7 or the welding lower mold 8 may be shifted and moved to a fixed position after the device to be welded 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. The ball core 4 and the ball core skin 5 become a ball shape and are fused to the skin 1A. At this time, the presser welding molds 9A, 9A are biased by the spring 10, so
Due to the cushioning action, the ball core skin 5 can be well rolled up by being pressed in a double dynamic manner, 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 the illustration, the ball core 4 is completely wrapped with the ball core skin 5, but in reality, it may be crushed and fused. However, since it is not visible from the front side, it does not make any difference in appearance since it is fused and wrapped in a round shape. The core skin 5 may be made of the same fabric as the skin 1A, or 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, the presser foot fusion type 9
A hole is drilled in the lower part of each of the wedges 11 to allow the wedge 11 to move laterally, and between the presser welding molds 9B and 9B, there is a pressing part 8b which is long in the horizontal direction and has a concave upper part. The bending portion 9d of the presser welding die 9B and the concave surface having an arcuate cross section at the upper end of the characteristic portion 8b form a round long groove portion 9b. .
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 placement of the ball core 4, ball core skin 5, and trim cover is the same as in the previous embodiment, and during welding, the heat fusion upper mold 7 lowers as it heats up, and the plurality of wedges 11 move to the left side and touch the upper surface. The pressing part 8b is pushed up on the inclined surface of the surface, and 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 latch 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 mold 7 is lowered in Fig. 4a by using vinyl leather or a hard knitted fabric for the ball core skin 5, and both sides 5b of the ball core skin 5 are pushed from above. It shows a curved shape that buckles inward.

FIG. 8 shows a product in which the upper mold 7 in the explanation of FIG. 4F has further descended and both ends 5b of the ball core skin 5 have been broken 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
A can be applied to a bending part (the center part of a 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 as a bending part, the ball core skin 5, and the ball core 4 are fused together by heating, and can also be applied to other cases shown in FIGS. 4c and 6 and subsequent figures. Although this figure shows a cross section, this is included because the skin surface of an actual seat may have not only straight sections but also curved sections. 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 wrapped around the ball core 4 and fused and formed. This is what I did.

In this manufacturing method, the skin 1A is placed in the long groove portion 9a in FIG. 4a.
Then, the ball core 4 is inserted, and the outer skin 1B is placed on top of it, and the subsequent steps are fusion-molded in the same manner as in the above-mentioned process order. In this embodiment, if the presser welding mold 9A and the spring 10 on the right side are abolished as shown in FIGS. 4a and 4b, the recess 1b on the right side of the ball core 4 in FIG. 6 will not be formed.

Furthermore, in Fig. 5b, the method of fusing 1B as a gusset part (peripheral part) was explained, 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 the ball into the long groove 9a in FIG. 4b, the long groove 9a is inserted by the ball core 4.
The push-in position can be held accurately.

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, and is used when it is desired to make the ball core skin 5 larger than the ball core 4, and the ball core skin 5 is made wider so that a part of the ball core It is double-wound and fusion molded.

In each of the embodiments described above, the ball core 4 may be entirely or mostly covered with the ball core skin 5 outside the long grooves 9a, 9b, and 9c.

In the above method, if the melting temperatures of the skins 1A, 1B, core skin 5, and wading 2 are different, the surface of the material with a lower melting temperature may melt too much because the material with a higher melting temperature is melted during welding. If the quality deteriorates, it is best to use a method to prevent cooling 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,
FIG. 6 is a cross-sectional view of another product, FIG. 7 is a cross-sectional view of an example in which the diameter of the ball rim is increased, and FIG. 8 is a cross-sectional view of an example in which vinyl leather or the like is used for the ball core skin 5. 1A, 1B...Skin, 1b, 7b, 7c...Concavity, 2...Wading, 3...Back base fabric, 4...Ball core, 5,5A...Ball core skin, 7...Heat fusion top Mold, 7a... Convex portion, 8, 8A, 8B... Fusion lower mold, 8a... Groove portion, 8b... Pressing portion, 8c...
Convex portion, 9A, 9B, 9D... Presser welded portion, 9
a, 9b, 9c...Long groove part, 9d...Bending part, 1
0...Spring, 11...Wedge, 12...Vertical hole,
13...Guide pin.

Claims (1)

[Scope of Claims] 1. In a method of fusion-molding a bead or a bead-like convex part on a skin by heating, a presser fusion part facing a lower fusion mold and having a long groove therebetween is movable. At the time of welding, the ball core skin cut into long strips and the ball core are installed in the groove in this order, and the surface side of the skin is pressed between the heat fusion upper mold and the presser fusion part of the lower fusion mold, and the fusion part is held down. The ball core skin is pressed by the presser fusion mold so as to wrap the ball core in a ball-shaped shape by raising or lowering either the lower melting mold or the upper heat-welding mold. A beaded fusion molding method for the epidermis, which is characterized by fusion molding on the epidermis. 2. Each of the presser welding molds has an L-shaped cross section, and is symmetrically attached to both sides of the protruding portion of the lower welding mold so as to be movable up and down, and the upper part of the presser welding mold is A long groove with a substantially rectangular cross section is formed by the upper end of the protruding part of the lower fusion mold, and a ball core skin and a ball core are installed in this long groove in this order, and this is fused and molded to the skin as a ball. A method for forming a beaded skin by fusion molding according to claim 1, which is characterized by: 3. The upper parts of the presser welding molds are rolled inward to form a round shape and symmetrically fixed to the lower welding mold, and a pressing part whose upper end forms a concave surface with an arcuate cross section is interposed therebetween so as to be vertically movable; A projection part whose lower surface forms an arcuate concave part is provided at the lower part of the fusion heating upper mold, and a long groove part having a substantially oval cross section is provided at the upper end of the presser welding part and the upper end of the pressing part, and the ball core skin and the ball part are formed in the long groove part. 2. The method of fusion-molding a bead on the epidermis according to claim 1, wherein the core is attached in order and the core is fusion-molded on the epidermis as a bead. 4. On the lower fusion mold, a presser fusion mold whose upper part is symmetrical with each other and has a long groove with a round cross section is mounted so as to be movable from side to side, and further a protrusion whose lower surface has a concave part on the lower part of the fusion heating upper mold. Claim 1, characterized in that a ball core skin and a ball core are installed in the long groove portion in this order, and this is fused and molded to the skin as a ball tab.
The epidermal bead fusion molding method described in Section 1.