JPS643660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pattern forming method for a seat cover for forming an uneven pattern on the surface of a seat cover for home use, vehicles, etc., and an apparatus for carrying out the method.

Seat covers made of base fabric and urethane foam, which is a resilient material, often have uneven parts for patterns. When forming this pattern, conventionally, as shown in FIGS. 1A and 1B, a seat cover is made of a base fabric 4 and a urethane foam 5 having a predetermined thickness between an upper mold 1 and a lower mold 2. 3 was inserted, and the entire seat cover 3 was formed into an uneven shape. However, a space is formed below the convex portion 3a of the seat cover 3, and the lower surface position of the convex portion 3a and the lower surface position of the concave portion 3b are different, and the pattern formed on the seat cover 3 is different from the convex portion 3a. The part 3a collapsed due to deformation, etc., and the intended purpose could not be achieved. Furthermore, as shown in FIG.
When the form 5 is left uncompressed, the convex portion 3a
The disadvantage was that the corners could not be finished at the desired sharp angle.

The purpose of the present invention is to easily obtain an uneven pattern on the surface of a seat cover, without deforming the convex portions of the formed uneven pattern, and to ensure that the corners of the convex portions are at sharp angles. The present invention provides a pattern forming method for a moldable seat cover and an apparatus therefor, which will become clear from the detailed description below with reference to the drawings.

FIGS. 2A, B, and C show a first embodiment of the method and apparatus for forming a pattern for a seat cover for a vehicle, etc. according to the present invention. As shown in FIG. A groove 12 having a shape corresponding to the convex portion 17a of the pattern to be molded is formed at the position, and the groove 12 of the upper mold 11 is formed in the lower mold 13.
A pair of protrusions 14 facing each other during pressing on the side surface of the
and cutters 15, which are notch members, are respectively attached to opposite sides of the pair of protrusions 14. A seat cover 17 made of material is placed between the upper mold 11 and the lower mold 13. The seat cover 17 is a normal one in which a base fabric 18 and a urethane foam 19 which is a resilient material are integrally formed, but a seat cover with a multilayer structure can be used as well. The protrusions 14 can be formed in series along the side surfaces of the groove 12, or a plurality of protrusions 14 can be formed along the side surfaces.

Next, as shown in FIG. 2B, when pressing the seat cover 17, the urethane foam 19 constituting the seat cover 17 is cut by the cutter 15. Cut 2 made by this cutter 15
It is preferable that the cut 1 does not reach the back side of the base fabric 18, but is cut at an appropriate distance from the base fabric 18. Further, the notches 21 are formed at positions along both sides of the convex portion 17a of the pattern. The seat cover 17 is heated and pressed at the same time as the notches 21 are formed, and the portions corresponding to the recesses 17b are compressed and deformed, but it is preferable that the convex portions 17a are also formed to be compressed to some extent. In the above embodiment, a cutter 15 is attached to the lower die 13 to form the notches 21 as the press progresses, but this cutter 15 is omitted and the press is performed using a cutter 15 with the notches 21 formed in advance. You can also do that.

According to the first embodiment of the present invention, as shown in FIG.
The tensile force due to the compression of 7b is alleviated by the presence of the notch 21, and the corners of the convex portion 17a can be formed sharply.

3A to 3E show a second embodiment of the seat cover pattern forming method of the present invention.
Parts corresponding to those in the figures are given the same reference numerals, and further detailed explanation thereof will be omitted, but this second embodiment includes the cutting process of the notch 21 shown in Fig. 2,
In addition to the pressing process, which is performed simultaneously with or after the cutting process, there is also a hot melt injection process. The seat cover 17 is made of the same base fabric 18 and urethane foam 19 as described above.

As shown in FIG. 3A, after the cutting process and the pressing process are completed, the lower mold 13 is lowered and the hot melt injection means 31 is inserted to the top of each cut 21 formed in the cutting process (FIG. 3B). ,
Then, while injecting the hot melt 32 from the tip of the hot melt injection means 31, the hot melt injection means 31 is gradually pulled out (FIG. 3C), and the hot melt 32 is deposited in the notch 21 at least in a dotted manner, preferably in a linear form. . This hot melt injection means 31 has an injection needle 34 at the tip of a hot melt filling cylinder 33, and a hot melt plunger 35 is provided in the filling cylinder 33, and the filling cylinder 33 is moved in and out of the cut 21. A device equipped with an operating section (not shown) such as a fluid pressure cylinder is used.

The hot melt 32 injected into the notch 21 adheres to both sides of the notch 21 due to the inward expansion of the convex part 17a of the seat cover 17, and the upper mold 11 is left in place for a set time to remove the expansion of the convex part 17a. By pressing it for a set time so that it does not face toward the side, both sides of the notch 21 in the convex portion 17a are adhered via the hot melt 32. (Figure 3D).

As shown in FIG. 3E, the seat cover 17 having a pattern, which is a product constructed through the above-mentioned steps, has a urethane foam 1 of a convex portion 17a.
The cut 21 formed in the hot melt 3
Since the urethane foam 19 is adhesively bonded and completely closed, deformation of the convex portion 17a caused by the opening of the notch 21 due to elastic deformation of the urethane foam 19 is prevented, and the corners of the convex portion 17a are kept in place. It can be finished to the desired angle.

In the above-described embodiment, the hot melt 32 is injected after the seat cover 17 is pressed. By injecting and performing the pressing process in this state, adhesion of the hot melt 32 to the notch 21 and adhesion of the notch 21 after pressing can be made extremely easy. In addition, cutter 1, which is the cutting means mentioned above,
5 and the injection means 31 for the hot melt 32 are not limited to those shown in the drawings, and the material of the seat cover 17 is not limited to being mainly made of urethane foam 19, but may be mainly made of a resilient material. Of course, it can be applied to general seat covers.

FIG. 4 shows a modification of the pattern forming method and apparatus according to the present invention, in which a hot wire tip 41 is used to form the incisions 21 in the above-mentioned cutting process. This heat ray chip 41
is provided along the upper end of the protrusion 14 of the lower mold 13, and is heated by an electric current from a power supply (not shown) to form the urethane foam 19 of the seat cover 17.
The notch 21 is formed by fusing.

The cut 21 cut by the hot wire tip 41
The side walls of the urethane foam 19 are thermoset and plastically deformed, thereby preventing the convex portion 17a from deforming due to the opening of the cut 21 in the urethane foam 19. After this cutting process is finished,
Alternatively, the sheet cover 17 is pressed using the upper die 11 and the lower die 13 simultaneously with the cutting process.

In this embodiment as well, hot melt injection means 31 similar to that described above may be used to inject hot melt 32 into the cut 21 to bond both sides of the cut 21.

The above is the configuration of one embodiment of the present invention. According to such a configuration, an uneven pattern can be easily obtained on the surface of the seat cover, and the convex portions of the pattern have elasticity. Since the material remains filled, there is no deformation, especially in the convex parts of the uneven pattern.
The corners of this convex part can be reliably formed into a sharp angle, and when hot melt is injected, the corners of the convex part can be formed into a sharp angle even more strongly, increasing the deformation prevention effect. I can do it.

[Brief explanation of the drawing]

FIG. 1A is a schematic cross-sectional explanatory diagram of the prior art;
Figure B is a cross-sectional explanatory diagram of a product formed using the conventional technology;
FIG. 1C is a cross-sectional explanatory diagram of different products formed by the conventional technique, and FIGS. Figure A is a cross-sectional explanatory diagram showing the state before pattern forming, Figure 2 B is a cross-sectional explanatory diagram showing the pressed state, Figure 2 C is a cross-sectional explanatory diagram of the product showing the state after pattern forming, and Figures 3 A to 3 are E shows the second embodiment of the molding method of the present invention, and FIG.
3 is an explanatory cross-sectional view showing the state in which the lower mold is removed after pattern forming, and FIGS. 3B, C, and D are cross-sectional views showing the state in which the hot melt injection means is inserted, the state in which hot melt is injected, and the state in which the notches are bonded with hot melt. The explanatory drawings, FIG. 3E, are a cross-sectional explanatory view of the product showing the state after pattern forming, and FIG. 4 is a schematic cross-sectional view of the lower die showing different cutting means of the present invention. In the figure, 11...upper mold, 12...concave groove, 13...
Lower mold, 14...Protruding piece, 15...Cutter, 17
...Seat cover, 17a...Protrusion, 17b...
Recessed portion, 18... Base fabric, 19... Urethane foam, 21... Notch, 31... Hot melt injection means, 32... Hot melt, 41... Hot wire tip.

Claims (1)

[Claims] 1. An uneven pattern is formed on the surface of a seat cover composed of a base fabric on the front side and an elastic material having a predetermined thickness bonded to the back side of the base fabric. A method comprising: a first mold having a groove corresponding to the convex part of the pattern; and a second mold having a protrusion inserted into a position close to the side and bottom surface of the groove; The inside of the protruding part of the second mold is formed into a hollow shape, and the space between the first mold and the second mold is such that the base fabric on the front side of the seat cover faces the first mold. When inserting the seat cover into the mold and pressing the seat cover with the first mold and the second mold relatively close to each other to form a concavo-convex pattern, the side of the convex portion to be molded 1. A method for forming a pattern for a seat cover, the method comprising: forming a cut in a resilient material at a position corresponding to the cut, and forming an uneven pattern after or simultaneously with the formation of the cut. 2. A first mold and a second mold are used to create irregularities on the surface of a seat cover that is composed of a base fabric on the front side and an elastic material having a predetermined thickness that is bonded to the back side of the base fabric. In an apparatus for molding a shaped pattern, a groove corresponding to a convex part of the pattern is formed in the first mold, and a groove is inserted into the second mold at a position close to the side and bottom surface of the groove. A protrusion is formed,
The inside of the protrusion is formed into a hollow shape, and a cut member is provided at the upper end of the protrusion or close to the protrusion, and the cut is made from the opposite side of the elastic material from the side that contacts the base fabric. A pattern forming device for a seat cover, characterized in that a cut is formed by a member. 3. The seat cover pattern forming apparatus according to claim 2, wherein the incision member is formed by a cutting blade. 4. The seat cover pattern forming apparatus according to claim 2, wherein the incision member is formed by a hot wire tip for cutting. 5. A method for forming an uneven pattern on the surface of a seat cover composed of a base fabric on the front side and an elastic material having a predetermined thickness bonded to the back side of the base fabric, wherein the pattern is a first mold having a concave groove corresponding to the convex portion of the convex portion, and a second mold having a protrusion inserted into a position close to the side and bottom surface of the concave groove; The inside of the protrusion is formed into a hollow shape, and the seat cover is inserted between the first mold and the second mold so that the base fabric on the front side of the seat cover faces the first mold. When the first mold and the second mold are brought relatively close to each other and the seat cover is pressed to form a concavo-convex pattern, a position corresponding to the side of the convex part to be molded is formed. A method for forming a pattern for a seat cover, comprising the steps of: forming a cut in a resilient material; and, after forming the cut, injecting hot melt into the cut portion of the resilient material.