JP2009196610A - Sewn part structure of interior component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a common core material regardless of existence of a sewn part, primarily. <P>SOLUTION: In the interior part sewn part structure, an interior component 21 of at least three-layer structure having a skin material 22, a cushion material 23 and the core material 24 in this order from a surface side is provided, and the interior component 21 is provided with the sewn part 27 having a sewing line 25 forming a joint part of the skin material 22 and a side part sewing line part 26 extending along a side part of the sewing line 25 on a surface. A double-layer sheet 31 in which a cushion material 23 is previously stuck on a back surface side of the skin material 22 is provided, and the interior component 21 is constituted by sticking the double-layer sheet 31 onto the surface of the core material 24. A collapse part 33 obtained by flatly collapsing the cushion material 23 is provided on the double-layer sheet 31, the sewn part 27 is formed on the collapse part 33 or its periphery. A flat sewn part 35 having no recession/projection is constituted by sticking the sewn part 27 onto a flat portion 34 of the core material having no recession part of the core material 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an interior part sewing part structure.

  In vehicles such as automobiles, various interior parts are attached to various parts in the passenger compartment. Such interior parts have a two-layer structure having a skin material and a core material in order from the surface side, and have a cushioning material between the skin material and the core material to provide more tactile sensation and decorative properties. There are things with an enhanced three-layer structure.

  Such interior parts include those having a sewing portion. Such a sewing part has at least a sewing line that becomes a joint of the skin material and a side sewing line part that extends along the side part of the sewing line (see, for example, Patent Document 1). ).

  Examples of conventional interior parts having a three-layer structure having a sewing portion include those shown in FIGS. 7, 9, and 11.

  First, in the case of the thing of FIG. 7, as shown to Fig.8 (a), the two skin materials 1 and 1 are mutually overlap | superposed and arrange | positioned in the state which aligned the edge part. Then, the two seam materials 1 and 1 that are overlapped with each other are stitched together at the inner positions having the width dimension 3 required for the seam allowances 2 and 2 from the end portions, thereby providing the ground stitch line portion 4.

  Next, as shown in FIG. 8 (b), the two skin materials 1, 1 are opened around the ground sewing line portion 4, and a sewing line 5 is formed on the surface side of the skin materials 1, 1. Do (make it appear). Further, the seam margins 2, 2 of the two skin materials 1, 1 are opened and overlapped on the back side of the corresponding skin material 1, 1, and the seam margin 2, corresponding to the skin material 1, 1 2 are sewed (overlapping sewing) to form side sewing line portions 6 and 6.

  Then, as shown in FIG. 8 (c), one common cushion material 7 is pasted on the back side of the two skin materials 1, 1 sewn, and the cushion material 7 is attached to one core material 8. The interior part 9 (9a) is completed by pasting on the surface.

  In the case of the one shown in FIG. 9, first, as shown in FIG. 10A, the two skin materials 1 and 1 are arranged so as to overlap each other with their end portions aligned. Then, the two outer skin materials 1, 1 are sewn together at the inner positions having the abutting margins 12, 12 having a width dimension 11 equal to the thickness of the cushion material 7 from the end portion. 4 is provided.

  Next, as shown in FIG. 10 (b), the two skin materials 1, 1 are opened around the ground sewing line portion 4, and a sewing line 5 is formed on the surface side of the skin materials 1, 1. Do (make it appear). Further, the joining margins 12 and 12 of the end portions of the two skin materials 1 and 1 are bent and faced to other portions of the skin materials 1 and 1 in a direction perpendicular to the surface. Further, the side portions of the ground sewing line portions 4 of the two skin materials 1 and 1 are sewn (single stitching) to form the side sewing line portions 6 and 6.

  Then, as shown in FIG. 10 (c), the two cushion materials 7 corresponding to the respective skin materials 1, 1 are provided on the back surface side of the two skin materials 1, 1 and the mating allowances 12, 12 sewn. , 7 are individually affixed, and the cushion materials 7, 7 are affixed to the surface of a single core material 8 to complete the interior part 9 (9b).

  Or in the case of the thing of FIG. 11, first, as shown to Fig.12 (a), the multilayer sheet | seat 15 which affixes the cushion material 7 previously on the back surface side of the skin material 1 is provided. And the two multilayer sheets 15 and 15 are arrange | positioned so that the skin materials 1 and 1 may overlap on the inner surface side in the state which aligned the edge part. Then, the two multi-layer sheets 15 and 15 that are overlapped with each other are stitched together at the inner positions having the width dimension 3 required for the seam allowances 2 and 2 from the end portions, thereby providing the ground stitch line portion 4.

  Next, as shown in FIG. 12 (b), the two multilayer sheets 15, 15 are opened around the ground sewing line portion 4, and the sewing line 5 is formed on the surface side of the skin material 1, 1. Form (appear). Also, the seam allowances 2 and 2 of the two multi-layer sheets 15 and 15 are opened and overlapped on the back side of the corresponding multi-layer sheets 15 and 15, and the seam allowance corresponding to the multi-layer sheets 15 and 15. 2 and 2 are sewed in a compressed state (overlapping sewing) to form side sewing line portions 6 and 6.

And as shown in FIG.12 (c), the two multilayered sheets 15 and 15 sewn are affixed on the surface of the core material 8, and the interior component 9 (9c) is completed. .
JP2002-79852

  In an interior part having a three-layer structure having a sewing part, it is necessary for the quality to finish the sewing part flat. In the case of FIG. 7, the sewing line 5 and the side sewing line parts 6 and 6 of the core material 8 are used. It was necessary to provide a recess 18 having a recess necessary for flattening at the position.

  However, if it does in this way, since it will be necessary to prepare two types of core materials with a shape with a specification with a sewing part, and a specification without a sewing part, ie, the core material 8 with the recessed part 18, and the recessed part 18 There is a problem that the production cost is high because the core material 8 without any material is required.

  In addition, in the case of FIG. 9, there is an advantage that the core material 8 without the recess 18 can be used, but the cushion materials 7 and 7 need to be individually attached to the respective skin materials 1 and 1. Therefore, the number of man-hours to be applied is doubled, and a high degree of alignment is required between the respective skin materials 1, 1 and the corresponding cushion materials 7, 7. In a sense different from the case of FIG. There was a problem of cost.

  In the case of FIG. 7 and FIG. 9, since it is costly to apply the cushion material 7 to the skin material 1, the multilayer in which the cushion material 7 is previously applied to the skin material 1 as shown in FIG. 11. Although the use of the sheet 15 is promoted, the multilayer sheet 15 has a thickness that is many times that of the single skin material 1, so that a larger recess 18 is required in the core material 8. The problem similar to FIG. 7 could not be avoided.

  In addition to the above, new problems and other problems may occur in the process leading to the present invention. Such a problem will be described in this section by explaining in the present invention. It can be replaced with the description. However, this column can be used if necessary.

  In order to solve the above problems, the invention described in claim 1 is provided with an interior part having at least a three-layer structure having a skin material, a cushioning material, and a core material in order from the surface side. In addition, in the interior part sewing part structure including a sewing part having a sewing line serving as a seam of the skin material and a side sewing line part extending along the side part of the sewing line, a cushion is provided on the back side of the skin material. A multilayer sheet is formed by pasting a material in advance, and the interior part is configured by pasting the multilayer sheet on the surface of the core material, and the cushion material is crushed flat on the multilayer sheet. While providing a crushing part, the said sewing part was formed in the said crushing part or its periphery, the said sewing part was affixed on the core flat part without a recessed part of a core material, and the flat sewing part without an unevenness | corrugation was comprised. It is characterized by

  The invention described in claim 2 is the above-described two multilayer sheets in which the two multilayer sheets are arranged so that the skin materials overlap each other on the inner surface side with the end portions aligned. Forming a crushing portion having a width dimension that is twice as large as the seam allowance or as much as the thickness of the multi-layer sheet at the end portions of both cushion materials located on the outer surface side of the crushing portion; A sewing line is formed on the surface side with a two-layer sheet opened around the sewing line and a sewing line portion formed by stitching two multilayer sheets to each other. In addition, the ground seam portion is a crease and the crushed portion is half-folded to the back side and overlapped with each other to have the same thickness as the multilayer sheet, and the crushed portion in the half-folded state, The side sewing line portion is formed.

  The invention described in claim 3 is the above, wherein the two multilayer sheets are arranged so that the skin materials overlap with each other on the inner surface side in a state where the end portions are aligned, and the two multilayered sheets are superimposed. A crushing portion having a width of the cushion material thickness is formed at the end portions of both cushion materials located on the outer surface side of the seat, and both skin materials of two multilayer sheets are joined to the crushing portion. A joint line is formed, and the two multilayer sheets are opened around the joint, and a sewing line is formed on the surface side. The side sewing line portion is formed on the side portion of the joint portion of the multilayer sheet.

  According to a fourth aspect of the present invention, in the above, the joining portion is a ground stitch line portion formed by stitching together the boundary portions of the crushed portions of the both skin materials of the two multilayer sheets. It is characterized by.

  The invention described in claim 5 is characterized in that, in the above, the joining portion is a welded portion formed by welding the crushed portions of both skin materials of two multilayer sheets. .

  Each of the above is the minimum configuration necessary for exhibiting the required operational effects. Of course, the details of the configuration described above and configurations not described above have a degree of freedom. is there. Of course, matters that can be read from the description of the above configuration are included in the scope even if they are not specifically described. In addition, when a configuration other than the above is added, it is needless to say that the operational effects of the added configuration are added.

  According to invention of Claim 1, the following effects can be acquired by the said structure. That is, by forming the sewn portion in the crushed portion of the multilayer sheet or in the vicinity thereof, the sewn portion can be formed without affecting the thickness of the multilayer sheet. It becomes unnecessary, and a common core material can be used regardless of the presence or absence of the sewing portion. Moreover, since the use of the multilayer sheet eliminates the need to attach the skin material and the cushion material, the production cost can be reduced accordingly. Furthermore, even if the interior part has a three-dimensional shape, the sewing portion can be easily formed.

  According to invention of Claim 2, the following effects can be acquired by the said structure. In other words, it is possible to achieve the same thickness as the multi-layer sheet by making the ground seam line a fold and making the crushed part half-fold to the back side, so that a flat sewing part can be achieved even if there is no recess in the core material Will be able to. Further, since the crushed portion in the half-folded state becomes a seam allowance, it is possible to obtain a side sewing line portion in a state where the seam allowance is overlapped.

  According to invention of Claim 3, the following effects can be acquired by the said structure. That is, by reducing the width of the crushed portion, the configuration around the sewing portion is simplified, and the overlap of the multilayer sheets is eliminated, so that a flat sewing portion can be achieved even if the core material has no recess. Will be able to.

  According to the invention of claim 4, with the above-described configuration, the two multilayer sheets can be reliably joined by the ground line portion.

  According to the invention of claim 5, with the above configuration, it is possible to eliminate the ground stitch line portion and simultaneously form the crushed portion and the welded portion, thereby simplifying the manufacturing process and reducing the cost. Can do.

  An object of the present invention is to make it possible to use a common core material regardless of the presence or absence of a sewing portion.

  Hereinafter, embodiments embodying the present invention will be described together with illustrated examples.

  The following examples have a close relationship with the above-described background art and problems to be solved by the invention. Therefore, when necessary, the descriptions are diverted to each other or necessary corrections are made. And can be diverted.

  FIGS. 1-6 shows the Example of this invention, its modification, etc. FIG.

  First, the configuration will be described (mainly refer to FIG. 1).

Basic configuration
Various interior parts 21 are attached to various parts of a passenger compartment of a vehicle such as an automobile. Such an interior part 21 has at least a three-layer structure having a skin material 22, a cushion material 23, and a core material 24 in order from the surface side. For the skin material 22, leather, synthetic leather, urethane synthetic leather, PVC material, or the like is used.

  The interior part 21 having such a three-layer structure has a sewing part having a sewing line 25 serving as a joint of the skin material 22 and a side sewing line part 26 extending along the side part of the sewing line 25 on the surface. There are those with 27.

  In addition to the basic configuration as described above, this embodiment has the following configuration.

"Configuration common to each embodiment"
A multilayer sheet 31 formed by pasting the cushion material 23 in advance on the back side of the skin material 22 is provided. And the interior component 21 is comprised by affixing the multilayer sheet 31 on the surface of the core material 24. FIG. At this time, a crushing portion 33 formed by flatly crushing the cushion material 23 is provided on the multilayer sheet 31. And the sewing part 27 is formed in the crushing part 33 or its periphery. Furthermore, the sewing part 27 is affixed to the core material flat part 34 without the recessed part of the core material 24, and the flat sewing part 35 without an unevenness | corrugation is comprised.

  The above is a configuration common to the following embodiments. Each example will be described below.

Example 1
In the interior component 21 of FIG. 1, first, as shown in FIG. 2 (a), two multilayer sheets 31 are arranged so that the skin materials 22 overlap each other on the inner surface side with the end portions aligned. .

  Next, as shown in FIG. 2 (b), a seam allowance 41 (see FIG. 2 (d)) is formed at the end portions of the two cushion members 23 located on the outer surface side of the two superimposed multilayer sheets 31. The crushing portion 33 having a width dimension 42 that is twice as large as that of the multilayer sheet 31 or more than that of the multilayer sheet 31 is formed.

  The crushing portion 33 is formed by a welding method (ultrasonic (thermal) welding, thermal welding, etc.) using the welding device 43 (the same applies hereinafter).

  Further, as shown in FIG. 2 (c), a ground sewing line portion 45 formed by stitching two multilayer sheets 31 together is provided at the center of the width of the crushing portion 33. The ground sewing line portion 45 is formed along the end portion of the multilayer sheet 31.

  Then, as shown in FIG. 2 (d), the two multi-layer sheets 31 are opened around the ground sewing line portion 45, and the sewing line 25 is formed (appears) on the surface side. At the same time, the crushing portion 33 is half-folded to the back surface side with the ground stitch line portion 45 as a fold, and is overlapped with each other so as to have the same thickness as the multilayer sheet 31. Then, the overlapped half-folded crushing portion 33 is sewed (overlapping stitching) to form the side sewing line portion 26. The side sewing line portion 26 is provided in the portion of the seam allowance 41 described above.

  Finally, as shown in FIG. 1, two sewn multilayer sheets 31 and 31 are attached to the surface of one core 24 to complete the interior part 21 (21a). The interior part 21 a configured in this way has a seam allowance 41.

"Example 2"
In the interior component 21 of FIG. 3, first, as shown in FIG. 4A, the two multilayer sheets 31 are arranged so that the skin materials 22 are overlapped on the inner surface side with the end portions aligned. .

  Next, as shown in FIG. 4 (b), a width dimension 46 approximately equal to the thickness of the cushion material 23 is formed at the end portions of the both cushion materials 23 located on the outer surface side of the two stacked multilayer sheets 31. The crushing part 33 having

  Further, as shown in FIG. 4C, the crushing portion 33 is provided with a joining portion 47 that joins both the skin materials 22 of the two multilayer sheets 31.

  At this time, the joining portion 47 is a ground stitch line portion 45 formed by stitching together the boundary portions of the crushing portion 33 (and other portions) of the both skin materials 22 of the two multilayer sheets 31. .

  Then, as shown in FIG. 4 (d), the two multilayer sheets 31 are opened around the joint 47, and the sewing line 25 is formed (appears) on the surface side. Further, the corner portion of the crushing portion 33 is bent so that both sides of the corner portion are brought close to each other (folded), and the side sewing line portion 26 is formed on the side portion of the joint portion 47 of the multilayer sheet 31. . The side sewing line portion 26 is formed in a portion that is not the crushing portion 33.

  Finally, as shown in FIG. 3, the two multi-layer sheets 31, 31 sewed are attached to the surface of one core member 24 to complete the interior part 21 (21 b). The interior part 21 b configured in this way does not have the seam allowance 41 and also has the ground stitch line portion 45.

"Example 3"
In the interior component 21 of FIG. 5, first, as shown in FIG. 6A, the two multilayer sheets 31 are arranged so that the skin materials 22 are overlapped on the inner surface side with the end portions aligned. .

  Next, as shown in FIG. 6 (b), a width dimension 46 approximately equal to the thickness of the cushion material 23 is formed at the end portions of the both cushion materials 23 positioned on the outer surface side of the two superimposed multilayer sheets 31. The crushing part 33 having

  Further, the crushing portion 33 is provided with a joint portion 47 that joins both the skin materials 22 of the two multilayer sheets 31.

  At this time, the joining portion 47 is a welding portion 51 formed by welding the portions of the crushing portions 33 of the both skin materials 22 of the two multilayer sheets 31.

  Then, as shown in FIG. 6 (c), the two multilayer sheets 31 are opened around the joint 47, and the sewing line 25 is formed (appears) on the surface side. Further, the corner portion of the crushing portion 33 is bent so that both sides of the corner portion are brought close to each other (folded), and the side sewing line portion 26 is formed on the side portion of the joint portion 47 of the multilayer sheet 31. . The side sewing line portion 26 is formed in a portion that is not the crushing portion 33.

  Finally, as shown in FIG. 5, two sewn multilayer sheets 31, 31 are attached to the surface of one core member 24 to complete the interior part 21 (21c). The interior part 21 c configured in this way does not have the seam allowance 41 and does not have the ground stitch line portion 45.

"Action"
Next, the operation of this embodiment will be described.

  According to this embodiment, the following effects can be obtained.

  (1) An interior part 21 having at least a three-layer structure having a skin material 22, a cushion material 23, and a core material 24 in order from the surface side is provided, and the interior part 21 is sewn on the surface to become a joint of the skin material 22 In an interior part sewing part structure having a sewing part 27 having a line 25 and a side sewing line part 26 extending along the side part of the sewing line 25, a cushion material 23 is pasted on the back side of the skin material 22 in advance. The multilayer sheet 31 is provided, and the interior part 21 is configured by sticking the multilayer sheet 31 to the surface of the core member 24. The crushing portion 33 is formed by flatly crushing the cushion material 23 on the multilayer sheet 31. And the sewing part 27 is formed on the crushing part 33 or the periphery thereof, and the sewing part 27 is pasted on the core material flat part 34 without the concave part of the core material 24 to form the flat sewing part 35 without irregularities. Shi It is thus possible to obtain the following effects.

  That is, by forming the sewing portion 27 on the crushing portion 33 of the multilayer sheet 31 or the periphery thereof, the sewing portion 27 can be formed without affecting the thickness of the multilayer sheet 31. The core member 24 does not require a recess, and the common core member 24 can be used regardless of the presence or absence of the sewing portion 27. That is, it is possible to use the same core material 24 for a specification with the sewing portion 27 and a specification without the sewing portion 27 (not shown). Moreover, since the use of the multilayer sheet 31 eliminates the need to attach the skin material 22 and the cushion material 23, the production cost can be reduced accordingly. Furthermore, even when the interior part 21 has a three-dimensional shape, the sewing portion 27 can be easily formed.

  (2) The two multilayer sheets 31 are arranged so that the skin members 22 overlap each other on the inner surface side with the end portions aligned, and are positioned on the outer surface side of the two multilayer sheets 31 that are superimposed. A crushing portion 33 having a width dimension 42 that is twice as large as the seam allowance 41 or larger than the thickness of the multilayer sheet 31 is formed at the end portions of the both cushion materials 23, and the width center portion of the crushing portion 33 is formed. A ground line portion 45 formed by stitching two multilayer sheets 31 together is provided, and the two multilayer sheets 31 are opened around the ground line portion 45, and the sewing line 25 is formed on the surface side. Are formed, and the crushing portion 33 is half-folded to the back side with the ground seam portion 45 as a fold, and is overlapped with each other so as to have the same thickness as the multilayer sheet 31, and is a half-folded state By forming the side sewing line portion 26 on the crushed portion 33, the following Effects can be obtained Una.

  That is, the same thickness as the multilayer sheet 31 can be obtained by making the ground seam line portion 45 a crease and the crushing portion 33 half-folded to the back surface side. The sewing portion 35 can be achieved. Further, since the crushed portion 33 in the half-folded state becomes the seam allowance 41, the side sewing line part 26 in a state where the seam allowance 41 is overlapped and sewn can be obtained.

  (3) The two multilayer sheets 31 are arranged so that the skin members 22 overlap each other on the inner surface side with the end portions aligned, and are positioned on the outer surface side of the two multilayer sheets 31 that are superimposed. A crushing portion 33 having a width dimension 46 approximately equal to the thickness of the cushion material 23 is formed at the end portions of the both cushion materials 23 to be bonded, and the two skin materials 22 of the two multilayer sheets 31 are joined to the crushing portion 33. The joint portion 47 is provided, the two multilayer sheets 31 are opened around the joint portion 47, the sewing line 25 is formed on the surface side, and the corner portion of the crushed portion 33 is bent to form a corner. By making the both sides of the portion close to each other and forming the side sewing line portion 26 on the side portion of the joint portion 47 of the multilayer sheet 31, the following operational effects can be obtained.

  That is, by reducing the width dimension 46 of the crushing portion 33, the configuration around the sewing portion 27 is simplified, and the overlapping of the multilayer sheets 31 is eliminated. The sewing portion 35 can be achieved.

  (4) Since the joining portion 47 is the ground stitch portion 45 formed by stitching the boundary portions of the crushing portions 33 of the two skin materials 22 of the two multilayer sheets 31, the ground stitch portion The two multilayer sheets 31 can be reliably joined by 45.

  (5) Since the joint portion 47 is the weld portion 51 formed by welding the portions of the crush portions 33 of the two skin materials 22 of the two multilayer sheets 31, the ground stitch line portion 45 is eliminated. In addition, since the crushed portion 33 and the welded portion 51 can be formed at the same time, the manufacturing process can be simplified and the cost can be reduced.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modifications are shown, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in a range and accuracy recognized by common sense.

It is sectional drawing of the interior component sewing part structure concerning Example 1 of this invention. (A) (b) (c) (d) is a manufacturing-process figure of FIG. It is sectional drawing of the interior component sewing part structure concerning Example 2 of this invention. (A) (b) (c) (d) is a manufacturing process diagram of FIG. It is sectional drawing of the interior component sewing part structure concerning Example 3 of this invention. (A) (b) (c) is a manufacturing-process figure of FIG. It is a figure of the interior part sewing part structure concerning a prior art example. (A) (b) (c) is a manufacturing process figure of FIG. It is a figure of the interior part sewing part structure concerning another prior art example. (A) (b) (c) is a manufacturing process figure of FIG. It is a figure of the interior part sewing part structure concerning another prior art example. (A), (b), and (c) are manufacturing process diagrams of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Interior part 22 Skin material 23 Cushion material 24 Core material 25 Sewing line 26 Side part sewing line part 27 Sewing part 31 Multi-layer sheet 33 Crushing part 34 Core material flat part 35 Flat sewing part 41 Sewing allowance 42 Width dimension 45 Ground Sewing part 46 Width 47 Joining part 51 Welding part

Claims (5)

An interior part having at least a three-layer structure having a skin material, a cushion material and a core material in order from the surface side is provided,
In the interior part sewing part structure, the interior part includes a sewing part having a sewing line that is a seam of the skin material on the surface and a side sewing line part that extends along the side part of the sewing line.
While providing a multilayer sheet formed by pasting a cushion material in advance on the back side of the skin material, the interior part is configured by pasting the multilayer sheet on the surface of the core material,
Providing a crushed portion formed by flatly crushing the cushion material on the multilayer sheet, and forming the sewing portion at or near the crushed portion,
An interior parts sewing part structure characterized in that the sewing part is pasted on a flat part of a core material without a concave part of the core material to constitute a flat sewing part without unevenness. Two multilayer sheets are arranged so that the skin layers overlap on the inner surface side with the ends aligned,
Forming a crushing portion having a width dimension that is twice as large as the seam allowance or larger than the thickness of the multi-layer sheet at the end portions of both cushion materials positioned on the outer surface side of the two superimposed multi-layer sheets And
In the center of the width of the crushed portion is provided a ground line portion formed by stitching two multilayer sheets together,
With the two multi-layer sheets opened around the ground sewing line portion, a sewing line is formed on the surface side,
The ground seam portion is a crease and the crushed portion is half-folded to the back surface side so that they have the same thickness as the multilayer sheet,
The interior part sewing part structure according to claim 1, wherein the side sewing line part is formed in the crushed part in a half-folded state. Two multilayer sheets are arranged so that the skin layers overlap on the inner surface side with the ends aligned,
Forming a crushing portion having a width dimension about the thickness of the cushion material at the end portions of both cushion materials located on the outer surface side of the two multilayered sheets that are superimposed,
Provide a joint for joining the two skin layers of the multilayer sheet to the crushed part,
With two multi-layer sheets open around the joint, forming a sewing line on the surface side,
Bend the corner part of the crushed part and bring both sides of the corner part close together,
The interior part sewing part structure according to claim 1, wherein the side sewing line part is formed on a side part of the joint part of the multilayer sheet.   4. The interior part sewing part according to claim 3, wherein the joint part is a ground sewing line part formed by stitching together the boundary parts of the crushed parts of both skin materials of two multilayer sheets. Construction.   4. The interior part sewing part structure according to claim 3, wherein the joint part is a welded part formed by welding the crushed parts of both skin materials of two multilayer sheets.

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