JP3130637B2 - Edge treatment method of bead in sheet skin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating an edge of a bead in a sewing process of a seat skin used for an automobile seat.

[0002]

2. Description of the Related Art Conventionally, for example, a seat cover 20 of an automobile seat shown in FIG.
-It is manufactured by sewing each skin piece such as the gussets 23, 23, the back obi 24, etc., and the rims 25, 25 for decoration are sewn to the seam between the top plate sides 22, 22 and the gussets 23, 23. It is sewn along the seam.

[0003] The bead 25 is formed by winding a bead band 27 around a bead core 26 as shown in FIG.
Numeral 6 is generally formed by molding a synthetic resin into a thin line having a circular cross section, and has a certain hardness and elasticity. The ball band 27 is made of a skin material such as polyester or leather.

As shown in FIG. 12, the bead 25 has a bead core 26 positioned on the front side, and the seam allowance of the bead band 27 is sandwiched between the seam allowance of the top plate side 22 and the seam allowance of the camber 23. By sewing together, the top plate side 22 and
3 is sewn along the sewn portion.

[0005] Thus, the top plate side 22
After the bead 25 is sewn, these ends (sewing allowance) and the ends (sewing allowance) of the top plate 21 are sewn together with their front sides facing each other, and the top plate 21 is sewn. .

[0006] When the top plate 21 is sewn, the top plate 2 is sewn.
1. A sewn portion that crosses in a T-shape is formed between the top plate side 22 and the gusset 23 (portion (c) in FIG. 9). Also,
The rear obi 24 is also sewn to the top plate side 22 and the gusset 23 in the same manner as the top plate 21 to form a sewn portion that intersects in a T-shape between the three members. ) Department).

The end of the bead 25 extends from the front side to the back side of the sheet skin 20 at the intersection of these T-shaped sewing portions as shown in FIG. 10 or FIG. And was erased.

[0008]

However, since the end portion of the bead 25 is conventionally treated as described above, the following problems have been encountered.

That is, in the sewn portion that intersects in a T-shape, the edge of the bead 25, particularly the end of the bead core 26, is applied to the back side of the top plate 21 in a state in which the end is left as it is (a thin line having a circular cross section). As shown in FIG. 14, the seam allowance 21a of the top plate 21 is sewn in a state of being raised from the seam allowance of the top plate side 22 and the camber 23, so that the T-shaped sewn portion (c) ), (D) in top plate 2
No. 1 was dubbed, and this was the cause of poor appearance such as swelling of the sheet skin 20 or wrinkles.

Further, since the bead core 26 is relatively hard, it is necessary to perform sewing with the bead 25 (especially the bead core 26) being stitched when the top plate 21 is sewn. I couldn't hang. For this reason, the workability of sewing is poor, and it is very difficult to finish (sewing) this intersection part with good appearance. Further, since the seam allowance 21a of the top plate 21 is not continuously sewn, the appearance of the T-shaped sewn portion is impaired also in this respect.

[0011] The above-mentioned problem is the same in the T-shaped sewn portion formed between the back and the rib.

The present invention has been made in view of these conventional problems, and does not cause swelling or wrinkles at the sewn portions intersecting in a T-shape. It is an object of the present invention to provide a method for treating an edge portion of a bead in a sheet skin that can be finished well and has good appearance.

[0013]

According to the present invention, in order to solve the above-mentioned conventional problems, the ends of the bead jointly sewn along the sewn portions of the first and second skin pieces are formed by the first and second skin pieces. 1st and 2nd
Of the outer skin piece is squashed to a thin flat state at the seam allowance for the third outer skin piece, and trimmed to the ends of the first and second outer skin pieces, and then the first and second outer skin pieces are cut. A third skin piece is sewn to the skin piece, and the end of the bead between the seam allowance of the first and second skin pieces and the seam allowance of the third skin piece is crushed to a thin flat state. It is characterized in that it is sewn together in a folded state.

[0014]

According to the above method, before the third skin piece is sewn, the end of the bead is crushed into a thin flat state, so that the seam allowance of the third skin piece is equal to that of the third skin piece. The first and second skin pieces are sewn together in a state of being substantially in close contact with the seam allowance. For this reason, the third skin piece is sewn at the T-shaped sewn portion without dubbing and without swelling or wrinkling.

The end of the bead is cut and aligned with the ends of the first and second skin pieces so as not to protrude toward the third skin piece. In this case, the third skin piece is not lifted by the end of the bead.

Further, since the end of the bead is crushed into a thin flat state at the seam allowance of the third skin piece,
When sewing the third skin piece, the bead of this portion can be sewn together, so that continuous sewing can be performed.

[0017]

Next, an embodiment of the present invention will be described with reference to FIGS. First, prior to describing the edge processing method of the present embodiment, an outline of a sheet skin S to which the method is applied will be described.

As shown in FIG. 1, the sheet skin S is mainly made of a top plate 1 and a top plate side 2 cut into a predetermined shape.
The top plate 1 is disposed substantially at the center so as to form a main seat portion, and the top plate side is formed along both sides of the top plate 1. Nos. 2, 2 and Kamachis 3, 3 are stitched together. Further, the rear rib 4 is stitched along the rear edge of the top 1, the top side 2, and the back 3.

The respective skin pieces 1 to 4 are sewn in this manner, so that the sheet skin S is attached to the sheet skin S in FIG.
A T-shaped sewn portion is formed at the portion indicated by (b).
The T-shaped sewn portion of the portion (a) is formed such that the sewn portion of the top plate side 2 and the gusset 3 abuts the sewn portion of the top plate 1,
The T-shaped sewn portion of the portion (b) is formed such that the sewn portion between the top plate side 2 and the gusset 3 abuts on the sewn portion of the rear oblique 4.

In addition, the rims 5 and 5 are sewn together at the sewn portion between the top plate side 2 and the gusset 3 to enhance the decorative effect of the sheet. ),
At the T-shaped sewn part of the part (b), it is erased so as to sneak under the top plate 1 or the back side of the rear rib 4.

The bead 5 is formed by wrapping a thin line-shaped bead core 6 with a folded bead band 7 in the same manner as in the prior art (see FIG. 11). It is made of easy-to-use PVC. The bead 5 is sewn together with the seam allowance of the bead band 7 inserted between the seam allowance of the top plate side 2 and the seam allowance of the camber 3, so that the bead 5 is sewn between the top board side 2 and the camber 3. It is sewn along the wearing part. The bead core 6 or bead band 7 may be made of any material suitable for high-frequency welding, and is not limited to vinyl chloride, and may be made of, for example, nylon. Further, the bead band 7 is not particularly suitable for high-frequency welding, but may be formed of a commonly used polyester, leather or the like.

Next, the manufacturing process of the sheet skin S will be described with reference to FIGS.

First, as shown in FIG. 4, the top plate side 2 and the gusset 3 are sewn. At this time, the bead 5 is
Are sewn together along the seam. That is, the bead core 6 is positioned on the front side of the sheet skin S, and the seam allowance of the bead band 7 is set between the seam allowance of the top plate side 2 and the seam allowance of the kerchief 3. What is necessary is just to sew the sewing allowance of 5 together.

Next, as shown in FIG. 5, the end of the bead 5 is crushed into a thin, flat state using a high-frequency welder 10.

The weld molds 9, 9 of the high-frequency welder 10 form a long block as shown in the figure, and are sewn as described above at the ends of the top plate side 2 and the gusset 3, ie, the top plate 1. Are arranged facing each other with the seam allowance 8 and the end of the bead 5 sewn together.
By generating a high frequency between the weld molds 9 and 9 and clamping the seam allowance 8 and the end of the bead 5 therebetween,
The end of the bead 5 is crushed into a thin flat state.

Further, the cutting blade 9 is provided on both the weld dies 9 and 9.
a, 9a are provided along the longitudinal direction and opposed to each other, and are balls which are pushed out when the two weld dies 9 and 9 are pressed and protruded from the seam allowance 8 of the top plate side 2 and the machichi 3. The edge 5 'is cut off by the cutting blades 9a, 9a. As a result, as shown in FIG. 6, the end of the bead 5 is squashed into a thin planar state, and at the same time, is cut and aligned with the top plate side 2 and the seam allowance 8 of the machi 3.

As described above, after the end of the bead 5 is crushed into a thin flat state and cut to the end of the seam allowance 8, the top plate 1 is sewn.

As shown in FIG. 7, the top board 1 is sewn together with the seam allowance 8 of the top board side 2 and the kerchief 3 and the seam allowance 1a of the top board 1 with their front sides facing each other. The sewing is performed by sewing the cut portion using the sewing machine 11. Here, the end of the bead 5 is squashed into a thin planar state, so that the seam allowance 1a of the top plate 1 is sewn in a state of being substantially in close contact with the seam allowance 8 without being lifted from the seam allowance 8. In addition, since the end of the bead 5 is thinly crushed at the seam allowance 1a (or 8), the end can be easily machined. Regardless, it is performed continuously and linearly.

When the sewing operation is completed, the top plate 1
By folding back, top plate 1, top plate side 2, kamachi 3
Is completed. Then, the other side of the top plate 1 is similarly sewn with the top plate side 2, the gusset 3 and the bead 5. After this is completed, the rear obi 4 is sewn to the rear edge of the top 1, the top side 2, and the back 3, thereby completing a series of sewing steps of the sheet skin S.

When sewing the rear rib 4, the end portions of the bead 5, 5 shown in (b) of FIG. 1 are also described above (a).
In the same manner as the section, the sheet is crushed into a thin planar state, and the top plate side 2 and the portion protruding from the rear end of the machi 3 are trimmed, and thereafter, the rear obi 4 is sewn.

In the present embodiment, the following operation and effect can be obtained by adopting the above-described method for treating the edge of the bead 5. That is, on the sheet skin S of this example, the beaded rims 5 and 5 are sewn together along the sewn portion between the top plate side 2 and the kerchief 3, and both ends of the bead 5 are connected to the top plate side 2. At the sewn portion of the top plate 1 or the top plate 1 formed by sewing the top plate 1 or the top plate side 2 and the top 3 at the T-shaped crossing portion formed by sewing. It is erased so as to sneak into the back of the back 4.

At the T-shaped sewing portion, the end of the bead 5 which is erased so as to be sunk into the back side of the top plate 1 or the rear oblique 4 is used for sewing the top plate 1 or the rear oblique 4. Prior to being crushed into a thin planar state, the seam allowance 1a of the top plate 1 can be sewn to a state in which the seam allowance 8 is substantially in close contact with the seam allowance 8 on the top plate side 2 and the machichi 3 side. That is, since the top plate 1 is sewn without dubbing, the sheet skin S is finished with a good appearance without wrinkling or swelling in the T-shaped sewn portion.

Further, the portions that protrude from the seam allowance 8 are cut and aligned by the cutting blades 9a, 9a of the weld dies 9, 9, and in this respect, appearance defects such as the bulging of the sheet skin S are eliminated. .

Further, since the end of the bead in the seam allowance is crushed thin, the end can be directly machined. From this, when sewing the top plate 1 or sewing the back rib 4, the sewing machine can be continuously and linearly stitched without avoiding the bead portion as in the related art. The wearing part can be finished with good appearance, and the sewing operation can be performed efficiently.

Further, since continuous sewing can be performed irrespective of the existence of the bead 5, the sewing operation can be performed by an automatic sewing machine, and the labor can be saved.

[0036]

According to the present invention, the end of the bead is squashed into a thin flat surface at a T-shaped intersecting sewn portion formed by sewing the first to third three skin pieces. After that, the third skin layer was sewn,
The seam allowance of the outer skin piece is sewn in a state of being substantially in close contact with the seam allowance of the first and second skin pieces.
At the T-shaped sewn portion, the appearance of the sheet can be finished without generating swelling or wrinkles on the sheet skin.

Further, since the end of the bead is cut and aligned with the end of the seam allowance, the end of the bead does not swell the third skin piece, and in this respect, the sheet skin is finished with a good appearance.

Furthermore, since the edge of the bead is made into a thin flat state in the seam allowance, the edge can be directly machined. From this, when sewing the third skin piece, sewing can be continuously and linearly performed without avoiding a bead, and the finish quality of the sewn portion can be improved. Thus, the sewing operation of the seat skin can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a front side of a seat skin according to an embodiment of the present invention.

FIG. 2 is an overall perspective view of the back side of the seat skin.

FIG. 3 is a detailed view of a portion A in FIG. 2;

FIG. 4 is a perspective view showing a state in which a top plate side, a gusset, and a bead are sewn in a manufacturing process of a sheet skin.

FIG. 5 is a perspective view showing an operation of pressing the edge of the bead and the seam allowance.

FIG. 6 is a perspective view showing a state in which the ends of the bead are cut and aligned.

FIG. 7 is a perspective view showing a sewing operation of the top plate.

FIG. 8 is a perspective view showing a state in which a top plate, a top plate side, and a gusset are sewn.

FIG. 9 is an overall perspective view of the front side of a sheet skin on which a conventional bead edge processing has been performed.

FIG. 10 is an overall perspective view of the back side of the seat skin.

FIG. 11 is a perspective view of an end of a bead.

FIG. 12 is a sectional view taken along line BB of FIG. 9;

FIG. 13 is a detailed view of a portion C in FIG. 10;

14 is a view as viewed in the direction of arrow D in FIG. 13;

[Explanation of symbols]

 S, 20: Sheet skin 1, 21, Top plate 2, 22: Top plate side 3, 23: Kamachi 4, 24 ... Rear ridge 5, 25 ... Ball 6, 26 ... Ball core 7, 27 ... Ball band 8 ... seam allowance 9 ... weld type, 9a ... cutting blade 10 ... high frequency welder 11 ... sewing machine

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 31/02 B68G 7/10

Claims (1)

(57) [Claims] 1. A sewing method in which a plurality of skin pieces cut in a predetermined shape are sewn to form a sheet, and the first to third three skin pieces are sewn to form a T-shaped cross stitch. A method of processing an end of a bead in a fitting portion, wherein the end of the bead co-sewn along a sewn portion of the first and second skin pieces is the first and second skins. In a seam allowance of the piece to the third skin piece, the piece is crushed to a thin flat state and trimmed to the ends of the first and second skin pieces, and then the first and second pieces are cut.
A third skin piece is sewn to the outer skin piece, and the end of the bead between the seam allowance of the first and second skin pieces and the seam allowance of the third skin piece is pressed to a thin flat state. A method of treating an edge of a bead on a sheet skin, wherein the edge is sewn together in a crushed state.