JP2013158536A - Vehicle seat and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress projection of piping from a surface skin in a vehicle seat including the surface skin for covering a cushion material, and a method for manufacturing the same.SOLUTION: In a vehicle seat, a corner surface skin 32 includes a first stitch part 36, and in the first stitch part 36, a loop part 28 of piping 22 and a corner surface skin 32 are sewn to each other. Compared with a conventional technique in which the corner surface skin 32 and a side surface skin 46 are sewn to a piping-side stacking part 30 respectively, this configuration formed by sewing the corner surface skin 32 to the loop part 28, can suppress the projection of the loop part 28 from the corner surface skin 32 and furthermore, suppress the projection of the piping 22 from the corner surface skin 32 and the side surface skin 46.

Description

  The present invention relates to a vehicle seat provided with a skin covering a cushion material and a method for manufacturing the same.

  Some vehicle seats have a bead formed on the skin covering the cushion material. The edge is disposed between the sheet skins constituting the epidermis and stitched to the sheet epidermis (see, for example, Patent Document 1 below).

JP-A-11-221131

  However, in the vehicle seat described in Patent Document 1, a bead skin is wound around the outer periphery of the ball core, and the seat skin is co-sewn on the portion where both ends of the bead skin overlap. The ball edge (the part covering the ball core of the ball edge skin) protrudes from the sheet skin.

On the other hand, in a vehicle seat, there is a demand to arrange the seat skin and the bead from the design surface.

  An object of the present invention is to provide a vehicle seat that can suppress the protrusion of the edge from the outer skin in consideration of the above facts.

  The vehicle seat according to claim 1 includes a ball core formed in an elongated shape, a loop portion bent in a loop shape and covering the ball core, and a bead side overlapping portion overlapping each other at both ends of the loop portion. And a first skin having a first stitched portion that is sewn to the loop portion and constitutes a part of the skin covering the cushion material, and the epidermis. And a second skin that is arranged adjacent to the first epidermis via the bead, and is sewn to the bead epidermis.

  In the vehicle seat according to claim 1, the bead skin has a loop portion bent in a loop shape and a bead side overlapping portion overlapping each other at both ends of the loop portion, and the ball core is a loop. Covered by the part. And the 1st epidermis and 2nd epidermis which comprise a part of epidermis which covers a cushion material are mutually arrange | positioned through a bead, and are sewn with the bead epidermis.

Here, the first epidermis has a first stitching portion, and the loop portion and the first epidermis are stitched in the first stitching portion. For this reason, compared with the prior art in which the first epidermis and the second epidermis are respectively sewn to the bead-side overlapped part, the first epidermis is sewn to the loop part, thereby suppressing the protrusion of the loop part from the first epidermis. And, in turn, the protrusion of the rim from the first and second skins can be suppressed.

  A vehicle seat according to a second aspect is the vehicle seat according to the first aspect, further comprising a second stitching portion formed on the second skin and co-sewn with the bead-side overlapping portion.

  In the vehicle seat according to claim 2, since the second stitched portion is formed in the second skin, and the second stitched portion and the bead side overlapping portion are co-sewn, The stitching for looping the epidermis and the stitching of the beaded epidermis and the second epidermis can be shared.

  The vehicle seat according to claim 3 is the vehicle seat according to claim 2, wherein the first skin is folded at a portion adjacent to the loop portion and overlaps each other, A second stitching portion that stitches the first skin-side polymerized portion, and the second skin is folded at a site adjacent to the loop portion and overlaps with each other, and the second skin-side polymerized portion And a fourth stitched portion in which the side overlap portion and the bead side overlap portion are stitched together.

  In the vehicle seat according to claim 3, the first skin is folded at a portion adjacent to the loop portion, so that the first skin is overlapped with each other to form the first skin side overlapping portion. And the 1st skin side superposition | polymerization part is stitch | sutured and a 3rd stitching | suture part is formed. For this reason, the intensity | strength in a 1st skin side superposition | polymerization part can be made high by arrange | positioning a 3rd sewing part adjacent to a 1st sewing part.

  In addition, the second skin is folded back at a portion adjacent to the loop portion, so that the second skin overlaps with each other to form a second skin side overlapping portion. And this 2nd skin side superposition | polymerization part and a bead side superposition | polymerization part are stitch | sutured, and a 4th suturing part is formed. For this reason, the intensity | strength in a 2nd skin side superposition | polymerization part can be made high by arrange | positioning a 4th sewing part adjacent to a 2nd sewing part.

  The vehicle seat according to claim 4 is the vehicle seat according to claim 3, wherein one end of the vehicle seat is co-sewn with the first skin side overlapping portion at the third stitching portion, and the cushion material is supported. Is provided with a force cloth having the other end fixed thereto.

  5. The vehicle seat according to claim 4, wherein one end portion of the baffle is sewn together with the first skin side overlapping portion at the third stitching portion, and the other end portion of the baffle supports the cushion material. For example, an air bag device is built in the vehicle seat, and the cleavage position in the epidermis when the air bag is deployed can be set. That is, for example, by setting the sewing thread used for the first stitching portion to be thinner than the sewing thread used for the second stitching portion, the epidermis can be cleaved at the first stitching portion when the airbag is deployed. Further, at this time, since the stitched state between the bead and the second epidermis is maintained, it is possible to suppress the bead from preventing the airbag from being developed.

  The vehicle seat according to claim 5 is the vehicle seat according to any one of claims 2 to 4, wherein the second skin is opposite to the first stitching portion of the loop portion. A fifth stitched portion stitched to the portion.

In the vehicle seat according to claim 5, the second epidermis has a fifth stitched portion stitched with the loop portion, and the fifth stitched portion is formed on the side opposite to the first stitched portion. . For this reason, since the 2nd skin is also stitched | sutured with a loop part, the protrusion from the 2nd skin of a loop part can be suppressed. Thereby, since the protrusion from the 1st skin and 2nd skin of a loop part can be suppressed further, the protrusion from the 1st skin and 2nd skin of a rim can be suppressed further.

  The method for manufacturing a vehicle seat according to claim 6 includes a step of forming a first stitched portion by stitching the bead skin and the first skin, and a portion including the first stitched portion of the bead skin. A step of forming a loop portion that bends in a loop shape to cover the ball core, and forms a ball side overlapped portion by overlapping both ends of the ball cover, and the ball side overlapped portion and the second skin are combined. And a step of sewing.

  In the vehicle seat manufacturing method according to claim 6, the first stitched portion is formed by stitching the beaded skin and the first skin. And a loop part is formed by bending the part including the 1st stitching part of a ball edge epidermis in a loop shape so that a ball core may be covered. Accordingly, the first epidermis and the loop portion are stitched at the first stitching portion. Further, the second epidermis and the bead skin are stitched together by stitching together the bead side overlapped portion where the both ends of the bead epidermis are overlapped with the second epidermis.

By the above, compared with the prior art in which a 1st skin and a 2nd skin are each stitched | sutured to a bead side superposition | polymerization part, the protrusion from the 1st skin of a loop part can be suppressed, and by extension, the 1st skin and 2nd of a bead Protrusion from the epidermis can be suppressed.

  According to the vehicle seat of the first aspect, it is possible to suppress the protrusion of the rim from the outer skin.

  According to the vehicle seat of the second aspect, it is possible to share the stitching for making the rim epidermis into a loop shape and the stitching of the rim epidermis and the second epidermis.

  According to the vehicle seat of the third aspect, the strength of the first skin side polymerization portion and the second skin side polymerization portion can be increased.

  According to the vehicle seat of the fourth aspect, it is possible to set the cleavage position in the vehicle seat when the airbag apparatus is operated, and to suppress the bead from hindering the deployment of the airbag.

According to the vehicle seat of the fifth aspect, the protrusion of the rim from the first skin and the second skin can be further suppressed.

  According to the vehicle seat manufacturing method of the sixth aspect, it is possible to suppress protrusion of the ball edge from the skin.

It is the expanded expanded sectional view (1-1 sectional view taken on the line of FIG. 2) which shows the principal part of the seat skin used for the vehicle seat which concerns on embodiment of this invention. It is a perspective view which shows a part of vehicle seat which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the stitching | suture procedure in the sheet | seat outer skin shown by FIG. It is explanatory drawing for demonstrating the stitching | suture procedure in the sheet | seat outer skin shown by FIG. It is explanatory drawing for demonstrating the stitching | suture procedure in the sheet | seat outer skin shown by FIG. It is explanatory drawing for demonstrating the stitching | suture procedure in the sheet | seat outer skin shown by FIG. It is the expanded expanded sectional view which shows the principal part of the seat skin used for the vehicle seat which concerns on embodiment of this invention.

  FIG. 2 is a perspective view showing a part of the vehicle seat 10 according to the embodiment of the present invention. Note that an arrow FR appropriately shown in the drawings indicates the front of the seat, an arrow LH indicates the left side of the seat (one side in the seat width direction), and an arrow UP indicates the upper side.

  As shown in this figure, the vehicle seat 10 includes a seat back 12, and the seat back 12 is provided in an upright state at an end of the seat cushion (not shown) on which the occupant sits at the rear of the seat. Yes.

  The seat back 12 has a back pad 14 as a “cushion material”, and the back pad 14 is formed of a foam material such as urethane. The back pad 14 is supported by a back frame (not shown) as a “frame” that is a skeleton member of the seat back 12.

  The back pad 14 is covered with a sheet skin 20 as a “skin”. The seat cover 20 is a pair of rims 22 arranged at the corners on the seat front side of the seat back 12, and covers both sides of the back pad 14 in the seat width direction and the seat front side portions adjacent to the rims 22. A pair of corner skins 32 as “one skin” and a pair of side skins 46 as “second skins” that are adjacent to the ball edge 22 and cover both side surfaces of the back pad 14 in the seat width direction. Yes. In FIG. 2, only the side skin 46 on the left side of the seat is shown.

  As shown in FIG. 1, the ball edge 22 has a long round rod-shaped ball core 24 made of a resin, and the ball core 24 is formed in a vertical direction at a corner of the seat back 12 on the front side of the seat. Are arranged along. The ball edge 22 has a substantially long rectangular sheet-shaped ball edge skin 26, and the ball edge skin 26 is bent in a loop shape when viewed from the longitudinal direction and covers the ball core 24. As a result, the looped portion of the bead skin 26 is bent into a loop. Moreover, the part which mutually overlaps in the both ends of the loop part 28 is used as the bead side superposition | polymerization part 30, and the bead side superposition | polymerization part 30 is co-sewn with the side skin 46 mentioned later. In FIG. 1, a side skin 46 and a corner skin 32, which will be described later, are shown in an unfolded state.

  The corner skin 32 is formed in a substantially rectangular sheet shape and is disposed along the longitudinal direction of the bead 22. The end portion of the corner skin 32 on the side of the ball edge 22 is stitched to the loop portion 28 of the ball edge 22 by a first sewing thread 34. The form of the first sewing thread 34 is a spun thread (spun thread), and the first sewing thread 34 is set to nominal # 20. A stitched portion between the corner skin 32 and the loop portion 28 is a first stitched portion 36, and the first stitched portion 36 is formed along the longitudinal direction of the bead 22.

  The corner skin 32 is folded back so as to overlap each other in the thickness direction at a position adjacent to the loop portion 28 of the ball edge 22 (a position of the first stitching portion 36). It is referred to as a corner skin side polymerization portion 38 as “skin side polymerization portion”. One end portion of the bundling 40 is disposed between the corner skin side overlapping portions 38, and the corner skin side overlapping portion 38 holds the one end portion of the bundling 40 while holding the third sewing thread. 42 is sewed together with the webbing 40. The form of the third sewing thread 42 is a filament thread, and the third sewing thread 42 is set to nominal # 5. A stitched portion between the corner skin side overlapping portion 38 and the bundling 40 is a third stitched portion 44, and the third stitched portion 44 is adjacent to the first stitched portion 36 and the first stitched portion 36. Are formed in parallel.

  The other end of the force cloth 40 is fixed to the back frame by fastening members such as bolts and nuts, and an air bag device (not shown) is built in the seat back 12. The airbag device includes a gas generator and an airbag fixed to a back frame. When the gas generator is operated, gas is supplied into the airbag, and the airbag is seatbacked. 12 is configured to bulge to the outside.

  The side skin 46 is formed in a substantially rectangular sheet shape, and is disposed along the longitudinal direction of the bead 22 on the side opposite to the corner skin 32 of the bead 22. The edge of the side skin 46 on the edge 22 side is sewn together with the edge side overlapping portion 30 of the edge 22 by a second sewing thread 48. The form of the second sewing thread 48 is a filament thread, and the second sewing thread 48 is set to nominal # 8. A stitched portion between the side skin 46 and the bead side overlapping portion 30 is a second stitched portion 50, and the second stitched portion 50 is formed along the longitudinal direction of the bead 22.

  The side skin 46 is folded back so as to overlap each other in the thickness direction at a position adjacent to the loop portion 28 of the ball edge 22, and this overlapping portion is a side skin as a “second skin side overlapping portion”. The side overlapping portion 52 is used. The side skin side overlapping portion 52 is sewn together with the bead side overlapping portion 30 by the fourth sewing thread 54 at a position opposite to the bead 22 of the second stitching portion 50. The form of the fourth sewing thread 54 is a filament thread, and the fourth sewing thread 54 is set to nominal # 5. That is, the fourth sewing thread 54 and the third sewing thread 42 are the same thread. A stitched portion between the side skin side overlapping portion 52 and the bead side overlapping portion 30 is a fourth stitched portion 56, and the fourth stitched portion 56 is adjacent to the second stitched portion 50 and is a second stitched portion. 50 is formed in parallel.

  Next, the operation and effect of the present embodiment will be described while explaining the stitching procedure of the ball edge 22, the side skin 46, and the corner skin 32.

  As shown in FIG. 3, first, the bead skin 26 is placed on one side surface of the corner skin 32. Then, using the first sewing thread 34, the corner skin 32 and the bead skin 26 are sewn. Thereby, the 1st stitching part 36 is formed in corner skin 32 (refer the dotted line of Drawing 3).

  After the first stitching portion 36 is formed in the corner skin 32, the corner skin 32 is folded back in the direction of arrow A in FIG. 3 and placed in the state shown in FIG. In this state, the ball core 24 is disposed on the bead skin 26 and the portion including the first stitching portion 36 of the bead skin 26 is bent in a loop shape so that both ends of the bead skin 26 are temporarily sewn ( (See dotted line in FIG. 4). Thereby, the loop part 28 and the ball edge side overlapping part 30 of the ball edge skin 26 are formed, and the ball core 24 is covered with the loop part 28.

  In this state, the bead skin 26 formed with the loop portion 28 and the bead side overlapping portion 30 and the corner skin 32 are placed on one side surface of the side skin 46 (see FIG. 5). Then, the bead-side overlapped portion 30 and the side skin 46 are stitched at the above-described temporary sewing position using the second sewing thread 48. As a result, the second stitching portion 50 is formed in the side skin 46.

  Then, the side skin 46 is folded back to the arrow B side shown in FIG. 5 at a position adjacent to the loop portion 28 to form a side skin side overlapping portion 52 (see FIG. 6). Furthermore, the 4th sewing part 56 is formed by sewing the side skin side superposition | polymerization part 52 with the bead side superposition | polymerization part 30 using the 4th sewing thread 54 (refer the dotted line of FIG. 6).

  On the other hand, the corner skin 32 is folded back at the position of the first stitching portion 36 to form a corner skin side overlapping portion 38. And the 3rd sewing part 44 is formed by sewing the corner skin side superposition | polymerization part 38 using the 3rd sewing thread 42 (refer the dotted line of FIG. 6). Thereby, as shown in FIG. 1, the ball edge 22, the side skin 46, and the corner skin 32 are stitched together. In FIG. 6, the webbing 40 is omitted as the case where the airbag apparatus is omitted. However, when the webbing 40 is provided, the corner skin side polymerization is performed when the third stitching portion 44 is formed. One end of the webbing 40 is disposed between the parts 38, and the webbing 40 is sewn together with the corner skin side superposition part 38.

Here, as described above, the corner skin 32 has the first stitching portion 36, and the loop portion 28 of the bead 22 and the corner skin 32 are stitched in the first stitching portion 36. For this reason, compared with the prior art in which the corner skin 32 and the side skin 46 are respectively stitched to the bead-side overlapped portion 30, the corner skin 32 is stitched to the loop portion 28, so that the loop portion 28 is separated from the corner skin 32. Protrusion can be suppressed, and as a result, protrusion of the ball edge 22 from the corner skin 32 and the side skin 46 can be suppressed. Thereby, it can be set as the design accent in the vehicle seat 10 by setting the ball edge 22 without projecting from the seat skin 20.

  Further, a second stitching portion 50 is formed on the side skin 46, and the side stitching 46 and the bead side overlapping portion 30 are stitched together in the second stitching portion 50. For this reason, it is possible to share the stitching for making the bead skin 26 in a loop shape and the stitching of the bead skin 26 and the side skin 46.

  Further, in the third stitching portion 44, the corner skin side overlapping portion 38 is stitched, and the third stitching portion 44 is formed adjacent to the first stitching portion 36 and parallel to the first stitching portion 36. For this reason, since the so-called double stitch is formed in the corner skin side superposition part 38 by the first stitching part 36 and the third stitching part 44, the strength in the corner skin side superposition part 38 can be increased.

  Further, the side skin side overlapping portion 52 and the bead side overlapping portion 30 are stitched together to form a fourth stitching portion 56, and the fourth stitching portion 56 is adjacent to the second stitching portion 50 and is second stitched. It is formed in parallel with the part 50. For this reason, since the so-called double stitch is formed in the side skin side overlapping portion 52 by the second stitching portion 50 and the fourth stitching portion 56 as described above, the strength in the side skin side overlapping portion 52 can be increased.

  Furthermore, one end portion of the webbing 40 is sewn together with the corner skin side overlapping portion 38 at the third stitching portion 44, and the other end portion of the webbing 40 is fixed to the back frame. The form of the first sewing thread 34 is a spun thread (spun thread), and the first sewing thread 34 is set to nominal # 20. The form of the third sewing thread 42 is a filament thread, and the third sewing thread 42 is set to nominal # 5. In other words, since the thickness of the first sewing thread 34 is set to be thinner than the thickness of the third sewing thread 42, the thickness of the first sewing section 36 is larger than the bonding strength of the third sewing section 44. The bonding strength is set low. For this reason, when the airbag device is operated and the airbag is deployed, the seat skin 20 can be cleaved at the site of the first stitching portion 36. Thereby, the cleavage position in the sheet | seat skin 20 can be set.

  Moreover, when the seat skin 20 is cleaved, the stitched state of the bead 22 and the side epidermis 46 at the second stitched portion 50 and the fourth stitched portion 56 can be maintained, so that the bead 22 expands the airbag. It can suppress obstructing.

  In the present embodiment, the side skin 46 is stitched to the bead side overlapping portion 30 of the bead skin 26 in the second stitching portion 50 and the fourth stitching portion 56. Instead, as shown in FIG. 7, a fifth stitching portion 60 for stitching the side skin 46 and the loop portion 28 of the beaded skin 26 is further formed, and the fifth stitching portion 60 is made to be the first stitch of the loop portion 28. You may arrange | position in the part on the opposite side of 1 stitching | suture part 36. FIG.

  Specifically, the side skin 46 and the loop portion 28 are stitched together by the fifth sewing thread 62 at the folded portion of the side skin side overlapping portion 52 of the side skin 46. And the form of this 5th sewing thread 62 may be set as filament thread, and the 5th sewing thread 62 may be set by calling # 8. Thereby, since the protrusion of the loop portion 28 of the ball edge 22 from the side skin 46 is suppressed, the protrusion of the ball 22 from the side skin 46 and the corner skin 32 can be further suppressed. In addition, since the fifth stitching portion 60 is disposed on the opposite side of the first stitching portion 36 of the loop portion 28, the bead 22 from the seat cover 20 can be viewed from the outside while allowing the bead 22 to be visually recognized from the outside. Can be suppressed. Thereby, the design of the vehicle seat 10 can be further improved.

  In the present embodiment, the side skin 46 is stitched to the bead side overlapping portion 30 of the bead skin 26 in the second stitching portion 50. Instead, only the edge side overlapping portion 30 is stitched at the second stitching portion 50, the side skin 46 and the loop portion 28 of the ball edge 22 are stitched at the fifth stitching portion 60 described above, and the fourth stitching is performed. In the portion 56, the side skin side overlapping portion 52 and the bead side overlapping portion 30 may be stitched together.

  Furthermore, in the present embodiment, the third stitching portion 44 is formed in the corner skin 32 and the fourth stitching portion 56 is formed in the side skin 46, but the third stitching portion 44 and the fourth stitching portion 56 are formed. May be omitted. In this case, one end of the webbing 40 may be sewn to the corner skin 32 separately.

  In the present embodiment, the airbag device is built in the seat back 12, but the airbag device may be omitted. In this case, in the third stitching portion 44, only the corner skin side overlapping portion 38 is stitched.

  Furthermore, in the present embodiment, the “first skin” of the present invention is the corner skin 32, and the “second skin” of the present invention is the side skin 46. Instead of this, the “first skin” of the present invention may be the side skin 46 and the “second skin” of the present invention may be the corner skin 32. In this case, the first stitching portion 36 and the third stitching portion 44 are formed on the side skin 46, and the second stitching portion 50 and the fourth stitching portion 56 are formed on the corner skin 32.

  Further, in the present embodiment, the bead 22 is formed on the seat cover 20 that covers the back pad 14 of the seat back 12, but the bead 22 on the seat cover that covers the cushion pad (not shown) that constitutes the seat cushion. May be formed.

10 Vehicle seat 14 Back pad (cushion material)
20 Seat epidermis (skin)
22 Ball edge 24 Ball core 26 Ball edge skin 28 Loop part 30 Ball edge side superposition part 32 Corner skin (first skin)
36 1st suture part 38 Corner skin side superposition part (1st skin side superposition part)
40 force cloth 44 third stitching portion 46 side epidermis (second epidermis)
50 Second suture part 52 Side skin side superposition part (second skin side superposition part)
56 4th suture part 60 5th suture part

The vehicle seat according to claim 1 includes a ball core formed in an elongated shape, a loop portion bent in a loop shape and covering the ball core, and a bead side overlapping portion overlapping each other at both ends of the loop portion. A first edge having a first stitching portion that is sewn together with only the loop portion, and a part of the outer skin that covers the cushion material. It comprises a part of the epidermis, a second epidermis arranged adjacent to the first epidermis via the bead, and stitched with the bead epidermis.

Here, the first epidermis has a first stitched portion that is sewn together with only the loop portion, and the loop portion and the first epidermis are stitched together in the first stitched portion. For this reason, compared with the prior art in which the first epidermis and the second epidermis are respectively sewn to the bead-side overlapped part, the first epidermis is sewn to the loop part, thereby suppressing the protrusion of the loop part from the first epidermis. And, in turn, the protrusion of the rim from the first and second skins can be suppressed.

The method for manufacturing a vehicle seat according to claim 6 includes a step of forming a first stitched portion by stitching the bead skin and the first skin, and a portion including the first stitched portion of the bead skin. Forming a loop portion that bends in a loop shape and covers the ball core and the first stitching portion that is stitched with only the loop portion, and forms a bead side overlapping portion by overlapping both ends of the bead skin And a step of co-sewing the bead-side overlapped portion and the second skin.

In the vehicle seat manufacturing method according to claim 6, the first stitched portion is formed by stitching the beaded skin and the first skin. Then, the loop portion is formed by bending the portion including the first stitching portion of the beaded outer skin so as to cover the ball core, thereby forming the loop portion and the first stitching portion that is stitched only with the loop portion. Is done . Accordingly, the first epidermis and the loop portion are stitched at the first stitching portion. Further, the second epidermis and the bead skin are stitched together by stitching together the bead side overlapped portion where the both ends of the bead epidermis are overlapped with the second epidermis.

Claims (6)

A ball core formed in a long shape, a bead skin having a loop portion that is bent in a loop shape and covers the ball core, and a bead side overlapping portion that overlaps each other at both ends of the loop portion. The beaded edge,
Forming a part of the epidermis covering the cushion material, and having a first sewn part stitched with the loop part,
Constituting a part of the epidermis, arranged adjacent to the first epidermis via the bead, and a second epidermis sewn with the bead epidermis;
Vehicle seat equipped with   2. The vehicle seat according to claim 1, further comprising a second stitched portion formed on the second skin and stitched together with the edge side overlapping portion. The first epidermis has a first epidermis side polymerized portion that is folded back at a site adjacent to the loop portion and overlaps with each other, and a third sewn portion that sews the first epidermis side polymerized portion,
The second skin is folded at a portion adjacent to the loop portion and overlapped with each other, and a fourth stitched portion in which the second skin side polymerized portion and the ball side polymerized portion are stitched together And the vehicle seat according to claim 2.   4. The vehicle seat according to claim 3, further comprising a blanket having one end portion sewn together with the first skin side overlapping portion at the third stitching portion and having the other end portion fixed to a frame supporting the cushion material. .   The vehicle seat according to any one of claims 2 to 4, wherein the second skin has a fifth stitched portion stitched to a portion of the loop portion opposite to the first stitched portion. Forming a first stitched portion by stitching the beaded epidermis and the first epidermis;
A step of bending a portion including the first stitched portion of the bead skin into a loop shape to form a loop portion that covers the ball core, and forming a bead side overlapping portion by overlapping both ends of the bead skin When,
The step of co-sewing the bead-side overlapping portion and the second skin;
A vehicle seat manufacturing method comprising:

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