JP2021065570A - Leather product and production method thereof - Google Patents

Abstract

To form a first stitch and a second stitch on a leather forming an external appearance so as to cross more surely in a good-looking manner.SOLUTION: In a leather (SP1), insertion holes 40 penetrating in a thickness direction are so provided as to overlap at an intersection of a first stitch 21 and a second stitch 22. In the insertion hole 40, an entangled part 21z of a needle thread and a bobbin thread constituting the first stitch 21 and an another entangled part 22z of the needle thread and the bobbin thread constituting the second stitch 22 are disposed adjacent or close to each other by a tension received from a corresponding stitch.SELECTED DRAWING: Figure 3

Description

The present invention relates to a leather product in which a first stitch and a second stitch (both are linear sewing lines) are formed by intersecting the leather having an appearance, and a method for manufacturing the same.

In this type of leather product, a plurality of stitches may be formed on the appearance of natural leather or synthetic leather (hereinafter, may be collectively referred to as leather) to improve the design. Here, in the field of leather products, the appearance of stitches may be different from each other from the viewpoint of further improvement of design, and as a method of making the appearance of each stitch different, for example, as in Patent Document 1, the colors are different. It is conceivable to use a thread material. Then, referring to FIG. 10, the first stitch 21A is formed on the leather, and then the second stitch 22A having a different appearance is formed so as to intersect with each other. By intersecting the stitches 21A and 22A of different colors at appropriate positions in this way, it is possible to increase the variation of the design that can be expressed as compared with the case where one stitch is provided.

JP-A-2002-194657

By the way, when the stitches are sequentially formed on the leather as described above, as shown by the solid line in FIG. 10, the stitches of the second stitch 22A overlap the stitches of the first stitch 21A formed earlier. It may intersect in a state of being. In such a case, the stitches of the first stitch 21A tend to have an appearance of being torn at an unintended part by the stitches of the second stitch 22A, and the appearance tends to be slightly inferior. And such a rupture tends to appear larger as the intersection angle θ of both stitches 21A and 22A becomes smaller. However, as shown by the two-dot broken line in FIG. 10, the needle drop points (41X, 42X) of both stitches can be intentionally brought close to each other. By crossing the stitches 21A and 22A in the vicinity of the needle drop points (entangled portions of the needle thread and the bobbin thread), excessive overlap between the stitches can be avoided. However, in this case, the sewing machine needle forming the second stitch 22A causes damage such as thread cracking and thread breakage at the entangled portion of the first stitch 21A, and the appearance of the first stitch 21A deteriorates. There is a risk of The present invention has been devised in view of the above points, and the problem to be solved by the present invention is to form the leather having an appearance by crossing the first stitch and the second stitch more reliably and visually. It is to keep it.

As a means for solving the above problems, in the leather product of the first invention, the first stitch and the second stitch having a different appearance from the first stitch are provided on the leather forming the appearance intersecting with each other. In this type of leather product, it is desired that the first stitch and the second stitch are more reliably formed by intersecting the appearance leather with good appearance.

Therefore, the leather of the present invention is provided with insertion holes penetrating in the thickness direction overlapping at the intersections of the first stitch and the second stitch. In the insertion hole, the entangled portion of the needle thread and the bobbin thread forming the first stitch and another entangled portion of the needle thread and the bobbin thread forming the second stitch are adjacent or close to each other depending on the tension received from the corresponding stitch. And are arranged. In the present invention, since the first stitch and the second stitch intersect each other at the confounding portion arranged in the insertion hole of the leather, the situation where the stitches of the stitches overlap excessively at the intersection is avoided as much as possible. can do. Further, the entangled portions of the stitches are inserted into the insertion holes and are in a relatively free state, and are adjacent to each other by the tension of the corresponding stitches. Therefore, the two entangled portions can be adjacent to each other or close to each other with the tension of the corresponding stitch even if the needle drop points (first forming points) are separated from each other from the viewpoint of avoiding the breakage of the stitch.

The leather product of the second invention is the leather product of the first invention, in which the insertion holes are formed in a circular shape centered on the intersection of the first stitch and the second stitch. In the present invention, the entangled portion and another entangled portion can be arranged in a well-balanced manner in the circular insertion hole, and it is possible to avoid a situation in which an unintended large gap is formed in the insertion hole as much as possible. Become.

The leather product of the third invention is the leather product of the first invention or the second invention, and the insertion hole has an opening size capable of inserting both an entangled portion and another entangled portion. In the present invention, both the entangled portion and another entangled portion can be comfortably inserted into the insertion hole and arranged in place by the tension of the corresponding stitch.

The method for producing a leather product according to the fourth invention is the method for producing a leather product according to any one of the first to third inventions. In the present invention, an insertion hole is formed in the leather at a position corresponding to the intersection of the first stitch and the second stitch. When the first stitch and the second stitch are formed by the sewing machine in this order, the first needle drop point of the sewing machine needle forming the entangled portion and the second stitch of the sewing machine needle forming another entangled portion are formed in the insertion hole. Set the two-needle drop point. At this time, when the region from the first needle drop point to the center of the insertion hole is set as the basic region, the second needle drop point is set in the insertion hole portion excluding the basic region. In the present invention, the region from the first needle drop point to the center of the insertion hole is set as the basic region in the insertion hole, and this basic region is regarded as the region where the entangled portion of the first stitch exists. Then, by setting the second needle drop point to the insertion hole portion excluding the basic region, it is more reliable that the sewing machine needle when forming the second stitch excessively interferes with the entangled portion of the first stitch. It becomes possible to avoid it.

In the method for manufacturing a leather product of the fifth invention, in the method for manufacturing a leather product of the fourth invention, an insertion hole formed in a circular shape centered on the intersection of the first stitch and the second stitch is formed in the first stitch. The first virtual line, which is the formation position, and the second virtual line, which is the formation position of the second stitch, are divided into four regions. Then, the basic area is set in a specific area among the four areas, and the second needle drop point is set in another area opposite to the specific area. In the present invention, the insertion hole is divided into four regions, and a specific region among them is set as a basic region. And by setting a second needle drop point in another area facing a specific area, it is possible to form another entangled part in the insertion hole without being disturbed by the entangled part as much as possible. Become.

The method for producing a leather product according to the sixth invention is the method for producing a leather product according to the fourth or fifth invention, which comprises a leather having an insertion hole, an elastic material elastically stretchable, and a planar backing material. And are stacked in this order, and sewn into a quilt shape by one of the following procedures (1) and (2). In the present invention, a quilted leather product can be produced by using at least one of both stitches for the quilting stitch.
(1) After the first stitch is formed on the leather, the leather, the elastic material, and the back surface material are sewn by the second stitch.
(2) The leather, the elastic material, and the back surface material are sewn by both the first stitch and the second stitch.

According to the first invention according to the present invention, the first stitch and the second stitch can be more reliably formed by intersecting the leather forming the appearance with good appearance. Further, according to the second invention, the first stitch and the second stitch can be formed in a more balanced manner and intersected with each other in a good-looking manner. Further, according to the third invention, the first stitch and the second stitch can be formed as reasonably as possible and intersected with each other in a good-looking manner. Further, according to the fourth invention, the first stitch and the second stitch can be more reliably formed by intersecting the appearance leather with good appearance. Further, according to the fifth invention, the first stitch and the second stitch can be more reliably formed by intersecting with each other in a good-looking manner. According to the sixth invention, the first stitch and the second stitch can be crossed with each other in a more attractive manner to produce a quilted leather product.

It is a perspective view of a vehicle seat. It is the schematic front view which shows the part of the seat back enlarged. It is a schematic perspective view which shows by breaking a part of a seat cover. It is the schematic front view of the insertion hole which shows the setting position of each needle drop point. It is a schematic front view of the insertion hole which shows the arrangement position of each entangled part. It is a schematic perspective view of each member which shows the initial stage of the manufacturing process of a seat cover. It is a schematic perspective view of each member which shows the latter part of the manufacturing process of a seat cover. It is a schematic perspective view of each member which shows the manufacturing process of the seat cover of the modification 1. FIG. It is a schematic perspective view of each member which shows the manufacturing process of the seat cover of the modification 2. It is the schematic front view of the leather which shows the conventional pair of stitches.

Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. 1 to 9. For convenience, each figure shows arrow lines indicating the front-rear direction, the left-right direction, and the up-down direction of the vehicle seat. For convenience, the insertion holes are shown larger than they actually are in FIGS. 3 to 5, and each stitch is shown by a dotted line in FIGS. 6 to 9. The vehicle seat 2 of FIG. 1 is a member corresponding to the leather product of the present invention (a leather product including at least one of natural leather and synthetic leather), and has a seat cushion 4, a seat back 6, and a headrest 8. .. These seat constituent members (4, 6, 8) cover the seat frame (4F, 6F, 8F) forming the seat skeleton, the seat pad (4P, 6P, 8P) forming the outer shape of the seat, and the seat pad, respectively. It has a seat cover (4S, 6S, 8S). A lower portion of the seat back 6 (described in detail later) is foldably connected to the rear portion of the seat cushion 4, and a headrest 8 is provided on the upper portion of the seat back 6.

[Seat back]
The seat back 6 shown in FIG. 1 is a member having a substantially rectangular shape in a front view, which is a backrest of an occupant, and has a plurality of stitches 21 to 24 together with the above-mentioned basic configurations 6F, 6P, 6S (each member). And the details of each stitch will be described later). Here, the plurality of stitches 21 to 24 are a plurality of stitches lined up in a line, are formed in a grid pattern, and intersect at appropriate positions. Each of these stitches 21 to 24 is arranged so as to form one pattern as a whole, and in this embodiment, the upper part is arranged so as to form a triangular pattern and the lower part is arranged so as to form a quadrangular pattern. Then, in this embodiment, from the viewpoint of improving the design, stitches of different colors (21, 22, etc.) are crossed at appropriate positions as described later. In this type of configuration, the stitch of the specific stitch (first stitch 21) shown in FIG. 2 is torn at an unintended location such as overlapping with the stitch of another stitch (second stitch 22). Appearance should be avoided as much as possible. Therefore, in this embodiment, the first stitch 21 and the second stitch 22 are more surely and nicely crossed and formed on the seat cover 6S (leather having an appearance) by using the insertion hole 40 described later. I decided. Hereinafter, each configuration will be described in detail.

[Basic configuration]
Here, the seat back 6 shown in FIG. 1 is formed by arranging the seat pad 6P on the seat frame 6F and then covering it with the seat cover 6S. The seat frame 6F is typically a substantially rectangular or arch-shaped frame in front view, and can be formed of a material having excellent rigidity such as metal or hard resin. The seat pad 6P is a member having an outer shape of the seat back 6, and can be formed of a foamed resin such as ^{polyurethane foam (density: 10 kg / m 3 to} 60 kg / m ^3). A seating portion 6a and left and right bank portions 6b are formed on the front side forming the seating surface of the seat pad 6P. The seating portion 6a is a portion formed in the center in the seat width direction in which an occupant can be seated, and has appropriate left and right dimensions and extends in the vertical direction. Further, the left and right bank portions 6b are portions that rise in a mountain shape relatively forward on the side of the seating portion 6a.

[Seat Cover]
The seat cover 6S shown in FIG. 1 is a face material constituting the design surface of the seat back 6, and is formed by suturing a plurality of skin pieces SP1 to SP3 and the like (in FIG. 1, for convenience, a part of the seat cover 6S is formed. Only the skin piece is marked). For example, the front surface of the seat cover 6S is formed by suturing a main skin piece SP1 that covers the seating portion 6a and a pair of side skin pieces SP2 and SP3 that cover the left and right bank portions 6b. Each epidermis piece SP1 to SP3 can be formed by suturing a single or a plurality of epidermis pieces. For example, the main epidermis piece SP1 is formed by suturing a pair of upper and lower epidermis pieces (reference numerals omitted). The main skin piece SP1 is a member corresponding to the leather of the present invention (at least one of natural leather and synthetic leather), and a plurality of stitches 21 to 24 and insertion holes 40, which will be described later, are formed. The material of each side skin piece SP2 and SP3 is not particularly limited, but typically leather or cloth (woven fabric, knitted fabric, non-woven fabric) can be appropriately selected and used.

[Main skin piece (leather)]
The leather main skin piece SP1 is formed in a quilt shape as shown in FIG. 3, and has an elastic material 30 and a back surface material 31 in a laminated state. Here, the elastic material 30 is a member that can be elastically expanded and contracted, and is interposed between the main skin piece SP1 and the back surface material 31. It is desirable that the elastic material 30 is made of a material that can be crushed and deformed by a tightening force when a specific stitch (quilting stitch) described later is sewn to the main skin piece SP1. Examples of the material of this type of elastic material 30 include a matte material of a foaming resin such as polyurethane foam, a plate material made of a resin having rubber elasticity, and a face material formed by three-dimensionally entwining or laminating fibers. Further, the back surface material 31 is a planar member arranged on the back side of the main skin piece SP1, and can be made of leather or cloth.

[stitch]
The plurality of stitches 21 to 24 shown in FIG. 1 are rows of linear stitches, respectively, and extend in an appropriate direction on the main skin piece SP1. The main skin piece SP1 is formed with a plurality of left-curved stitches 21 and 23 that are curved to the left from top to bottom (in FIG. 1, for convenience, one left-curved stitch). A specific reference numeral 21 is attached, and a common reference numeral 23 is attached to other left-curved stitches). Further, the main skin piece SP1 is formed with a plurality of right-curved stitches 22 and 24 that are generally curved to the right from top to bottom (in FIG. 1, for convenience, one right-curved stitch). A specific reference numeral 22 is attached to, and a common reference numeral 24 is attached to other right-curved stitches). The left-curved stitches 21 and 23 intersect the corresponding right-curved stitches 22 and 24 at appropriate positions. Here, the left-curved stitches 21 and 23 have substantially the same basic configuration, and the right-curved stitches 22 and 24 also have substantially the same basic configuration. Therefore, the details of the first stitch 21 which is one of the left curved stitches and the second stitch 22 which is one of the right curved stitches will be described below as an example.

[First stitch]
The first stitch 21 shown in FIG. 2 is formed by appropriately entwining the first needle thread 21x and the first bobbin thread 21y with a sewing machine as shown in FIG. The appearance of the first stitch 21 is formed at the seams of the first needle thread 21x appearing on the outer surface of the main skin piece SP1, and between the adjacent stitches, the first needle thread 21x and the first bobbin thread are further formed. An entangled portion 21z in which 21y is entangled through a needle hole or the like is formed (in FIG. 3, for convenience, only one entangled portion is designated with a reference numeral). In the first stitch 21 of this embodiment, a plurality of entangled portions 21z are formed substantially evenly, and one entangled portion 21z thereof is arranged at a position substantially coincident with the center 40C of the insertion hole 40 described later. ing. The first stitch 21 is formed only on the main skin piece SP1 prior to the second stitch 22, and is used exclusively for ensuring the design.

[Second stitch]
Further, the second stitch 22 shown in FIG. 2 is formed by appropriately entwining the second needle thread 22x and the second bobbin thread 22y with a sewing machine as shown in FIG. The appearance of the second stitch 22 is also formed at the seams of the second needle thread 22x appearing on the outer surface of the main skin piece SP1, and between the adjacent stitches, the second needle thread 22x and the second bobbin thread are further formed. Another entangled portion 22z in which 22y is entangled through a needle hole or the like is formed (in FIG. 3, for convenience, only one other entangled portion is designated with a reference numeral). Also in the second stitch 22 of this embodiment, a plurality of other entangled portions 22z are formed substantially evenly, and one of the other entangled portions 22z is arranged near the center 40C of the insertion hole 40 described later. Has been done. The second stitch 22 is used as a quilting stitch, and the main skin piece SP1, the elastic material 30, and the back surface material 31 are sewn together.

Here, as the yarns 21x, 21y, 22x, and 22y shown in FIG. 3, various yarns such as spun yarns, filaments, drawn yarns, and bulky yarns can be used, and if necessary, a raising treatment or a fluffing treatment is performed. It is also possible. Further, as the material of each thread 21x, 21y, 22x, 22y, a chemical fiber made of a plant-based or animal-based natural fiber, a thermoplastic resin or a thermosetting resin can be exemplified, and these can be used in combination. In this embodiment, each thread 21x (21y) of the first stitch 21 and each thread 22x (22y) of the second stitch 22 have substantially the same basic configuration except that the appearance is different as described later. .. For example, referring to FIG. 2, the pitch L1 (seam length) and fineness of the first stitch 21 are set to be substantially the same as those of the second stitch 22.

[Appearance of each stitch]
The first needle thread 21x of the first stitch 21 and the second needle thread 22x of the second stitch 22 shown in FIG. 3 have different appearances, and the difference in appearance is exclusively visually discernible. That is. For example, the difference in appearance of each stitch 21 and 22 can be discriminated exclusively by at least one of the three elements of color (hue, lightness, saturation), and the appearance is particularly different if the hue (type of color) is different. Can be considered different. In this embodiment, assuming that the outer surface of the main skin piece SP1 (leather) is colored black or dark, each stitch 21 and 22 is set so as to have an appearance different from that of the main skin piece SP1. To do. At this time, the first needle thread 21x of the first stitch 21 is colored white or light-colored so as to have a relatively conspicuous appearance. Further, the second needle thread 22x of the second stitch 22 is colored black or a dark color so as to have a relatively inconspicuous appearance. By setting each stitch 21 and 22 to have different appearances in this way, it is possible to give various variations of designs to the main skin piece SP1, and the configuration contributes to ensuring the excellent design of the sheet. Since the appearances of the bobbin yarns 21y and 22y have almost no effect on the appearance of the corresponding stitches, they may have different appearances or may have the same appearance.

[Insert hole]
The insertion holes 40 shown in FIGS. 2 and 3 are holes that penetrate the main skin piece SP1 in the thickness direction, and can be formed by physical means such as a punch mechanism or optical means such as a laser. The insertion hole 40 has a diameter dimension (opening dimension) L2 capable of inserting the entangled portion 21z of the first stitch 21 and another entangled portion 22z of the second stitch 22, and the diameter dimension L2 is a diameter dimension L2 of each stitch 21. It is set to be smaller than the pitch L1 of 22. For example, the diameter dimension L2 of the insertion hole 40 of this embodiment is set to be at least twice the diameter of a normal needle hole (not shown), and is set so that each entangled portion 21z and 22z can be inserted one by one. .. The insertion hole 40 is formed in a substantially circular shape when viewed from the front as shown in FIGS. 4 and 5, and the center 40C thereof is formed so as to substantially coincide with the intersection of the stitches 21 and 22. ..

[Positional relationship of each confounding part with respect to the insertion hole]
Then, the first stitch 21 and the second stitch 22 are formed in a cross shape on the main skin piece SP1 (leather) shown in FIGS. 2 and 3 (details of the forming method of each stitch will be described later). In this type of main skin piece SP1, it is desired that the first stitch 21 and the second stitch 22 are more reliably formed so as to intersect with each other in a good-looking manner. For example, it should be avoided as much as possible that the seam of the first stitch 21 has an appearance of being torn at an unintended part of the seam of the second stitch 22. Therefore, the main skin piece SP1 of the present embodiment is provided with an insertion hole 40 penetrating in the thickness direction overlapping at the intersection of the first stitch 21 and the second stitch 22. Then, in the insertion hole 40, the entangled portion 21z of each thread 21x, 21y forming the first stitch 21 and another entangled portion 22z of each thread 22x, 22y forming the second stitch 22 are received from the corresponding stitch. They are placed adjacent or close to each other by tension.

That is, in the main skin piece SP1, as shown in FIG. 3, the first stitch 21 is formed across the insertion hole 40, and one entangled portion 21z of the first stitch 21 is arranged in the insertion hole 40. ing. The entangled portion 21z in the insertion hole 40 is arranged near the center 40C of the insertion hole 40 due to the tension applied from the other first stitch 21 portions. Here, referring to FIGS. 4 and 5, the first stitch 21 is formed by a sewing machine as described later, and the initial formation position of the entangled portion 21z is the first needle drop point 41 of the sewing machine needle (details will be described later). Is set by. In this embodiment, as will be described later, the first needle drop point 41 is set at a portion other than the center 40C of the insertion hole 40, and the entangled portion 21z of the first stitch 21 at the beginning of formation is deviated from the center 40C of the insertion hole 40. It is formed at the position. The entangled portion 21z is naturally attracted to the center 40C of the insertion hole 40 by the tension from the other first stitch 21 portions. The region from the first needle drop point 41 to the center 40C of the insertion hole 40 (basic region 41A) is a region where the entangled portion 21z of the first stitch 21 may exist.

Further, the second stitch 22 shown in FIG. 3 is formed across the insertion hole 40 so as to intersect the first stitch 21. Also in this second stitch 22, another entangled portion 22z thereof is arranged in the insertion hole 40. Then, in this embodiment, the insertion hole 40 has an appropriate diameter dimension L2, and both the entangled portion 21z and another entangled portion 22z can be easily inserted into the insertion hole 40. Therefore, even when the entangled portion 21z is arranged in advance in the insertion hole 40, another entangled portion 22z can be smoothly formed in the insertion hole 40. Then, another entangled portion 22z in the insertion hole 40 is attracted to the vicinity of the center 40C of the insertion hole 40 while expanding and contracting the elastic material 30 by the tension applied from the other second stitch 22 portion, and is close to or adjacent to the entangled portion 21z. It is in a state of being placed. At this time, the entangled portion 21z and another entangled portion 22z are arranged in a well-balanced manner in the circular insertion hole 40. By arranging the entangled portions 21z and 22z in the insertion hole 40 in a well-balanced manner in this way to avoid the formation of a large gap locally in the insertion hole 40, the appearance of the seat cover 6S can be appropriately maintained.

Here, the second stitch 22 is formed by the sewing machine as described later with reference to FIGS. 4 and 5, and the initial formation position of another entangled portion 22z is the second needle drop point 42 of the sewing machine needle (details). It is set by (described later). In this embodiment, as will be described later, the second needle drop point 42 is set outside the basic region 41A, and another entangled portion 22z at the beginning of formation is formed in the insertion hole 40 so as to avoid the entangled portion 21z. By setting the second needle drop point 42 in this way, another entangled portion 22z can be formed in the insertion hole 40 while avoiding interference (thread stepping) between the sewing machine needle and the first stitch 21 as much as possible. .. Then, another entangled portion 22z is naturally attracted to the entangled portion 21z side by the tension from the other second stitch 22 portion.

Thus, in this embodiment, as shown in FIG. 3, the first stitch 21 and the second stitch 22 intersect each other at the entangled portions 21z and 22z arranged in the insertion hole 40 of the main skin piece SP1 (leather). ing. By forming the intersections of the stitches 21 and 22 in the vicinity of the entangled portions 21z and 22z in this way, the stitches of the stitches 21 and 22 can be expressed in a good-looking manner, which contributes to ensuring the reproducibility of the design of the main skin piece SP1. It is composed. Further, the entangled portions 21z and 22z of each stitch are inserted into the insertion hole 40 and are in a relatively free state, and are adjacent to each other by the tension of the corresponding stitch. Therefore, the two entangled portions 21z and 22z are adjacent to each other or close to each other by the tension of the corresponding stitches even if the needle drop points (first forming points) are separated from each other from the viewpoint of avoiding damage to the first stitch 21. Is possible. Further, in this embodiment, the entangled portion 21z and another entangled portion 22z can be arranged in a well-balanced manner in the circular insertion hole 40, so that an unintended large gap is created in the insertion hole 40 as much as possible. It becomes possible to avoid it. Then, in this embodiment, both the entangled portion 21z and another entangled portion 22z can be reasonably inserted into the insertion hole 40 and arranged in place by the tension of the corresponding stitch. Therefore, according to the present embodiment, the first stitch 21 and the second stitch 22 are more reliably formed by intersecting the main skin piece SP1 (leather forming the appearance) of the seat cover 6S with good appearance. it can.

[Manufacturing method of main skin piece (formation method of each stitch)]
Here, the main skin piece SP1 shown in FIG. 3 can be manufactured by the procedure of the manufacturing method (1) described later shown in FIGS. 6 and 7. Then, prior to the manufacturing method (1), the insertion hole 40 is formed in the main skin piece SP1 (leather) shown in FIG. The insertion hole 40 is formed in a circular shape with the intersection of the first stitch 21 and the second stitch 22 as the center 40C, and the first needle drop point 41 and the second needle are formed at appropriate positions inside the insertion hole 40 as described later. A drop point 42 is set.

[Setting of each needle drop point]
With reference to FIGS. 4 and 5, a first needle drop point 41 for the entangled portion 21z and a second needle drop point 42 for another entangled portion 22z are set at appropriate positions in the insertion hole 40. For example, in this embodiment, the insertion hole 40 is formed by four quarter arc-shaped regions in the first virtual line VL1 which is the formation position of the first stitch 21 and the second virtual line VL2 which is the formation position of the second stitch 22. It is divided into (first region 51, second region 52, third region 53, fourth region 54). That is, in the insertion hole 40, the first region 51 and the second region 52 are formed at opposite positions, and the third region 53 and the fourth region 54 are formed at opposite positions.

Then, with reference to FIGS. 4 and 5, the first needle drop point 41 is set in the first region 51 among the four regions. For example, in this embodiment, the first needle drop point 41 is set at the position of the first region 51 slightly deviated from the center 40C of the insertion hole 40 in the direction along the first virtual line VL1. Then, the region from the first needle drop point 41 to the center 40C of the insertion hole 40 is set as the basic region 41A. This basic region 41A can be regarded as a region where the entangled portion 21z of the first stitch 21 exists as described above. Next, the second needle drop point 42 is set in the insertion hole 40 portion excluding the basic region 41A, and in this embodiment, it is set in the second region 52 at a position facing the first region 51. That is, the second needle drop point 42 is set at the position of the second region 52 slightly deviated from the center 40C of the insertion hole 40 in the direction along the second virtual line VL2. The shortest separation distance D1 between the first needle drop point 41 and the second needle drop point 42 can be set based on the diameter dimension L2 of the insertion hole 40 in consideration of the fineness of each stitch 21 and 22 and the like. .. For example, in this embodiment, the separation distance D1 is set to be larger than 1/2 of the diameter of the insertion hole 40 (L2 × 1/2 <D1).

[Manufacturing method (1)]
In the manufacturing method (1) shown in FIGS. 6 and 7, the main skin piece SP1, the elastic material 30, and the back surface material 31 are laminated in this order, and then sewn into a quilt shape. At this time, as shown in FIG. 6, the first stitch 21 is formed in advance on the main skin piece SP1 and the entangled portion 21z is arranged in the insertion hole 40. The entangled portion 21z is formed at the first needle drop point 41 with reference to FIGS. 4 and 5, but is in a state of being arranged near the center 40C of the insertion hole 40 by the tension of the first stitch 21. Next, as shown in FIG. 7, while the main skin piece SP1, the elastic material 30, and the back surface material 31 are sewn together by the second stitch 22, another entangled portion 22z is brought close to the entangled portion 21z by the tension of the second stitch 22. Or place them adjacent to each other. In this embodiment, another entangled portion 22z elastically expands and contracts the elastic material 30 and moves from the second needle drop point 42 shown in FIG. 5 toward the center 40C of the insertion hole 40. Become. At this time, as shown in FIGS. 4 and 5, by setting the second needle drop point 42 in the insertion hole 40 portion excluding the basic region 41A, the sewing machine needle when forming the second stitch 22 becomes the first. It is possible to more reliably avoid a situation in which the stitch 21 interferes excessively with the entangled portion 21z. Further, by setting the second needle drop point 42 in the second region 52 located at the opposite position of the basic region 41A, the other entangled portion 22z is inserted (reasonably) without being disturbed by the entangled portion 21z as much as possible. It can be formed in the hole 40. Thus, in this embodiment, the quilted main skin piece SP1 can be manufactured by using the first stitch 21 for the design and the second stitch 22 as the quilting stitch according to the manufacturing method (1). ..

As described above, in the present embodiment, the region from the first needle drop point 41 to the center of the insertion hole 40 is set as the basic region 41A in the insertion hole 40, and this basic region 41A is set as the entangled portion of the first stitch 21. It is regarded as the region where 21z exists. Then, by setting the second needle drop point 42 in the insertion hole 40 portion excluding the basic region 41A, the sewing machine needle when forming the second stitch 22 excessively interferes with the entangled portion of the first stitch 21. It becomes possible to avoid the situation more surely. Further, in this embodiment, the insertion hole 40 is divided into four regions (51 to 54), and a specific region (51) in the four regions (51 to 54) is set as the basic region 41A. Then, by setting the second needle drop point 42 in the other region (52) facing the specific region (51), another entangled portion 22z can be inserted into the entangled portion 21z without being disturbed as much as possible. It is possible to form within 40. Then, in this embodiment, the main skin piece SP1, the elastic material 30, and the back surface material 31 are sewn into a quilt shape by the procedure of the above-mentioned manufacturing method (1). By using the second stitch 22 for the quilting stitch in this way, the quilted main skin piece SP1 can be manufactured.

[Modification 1 (Manufacturing method (2))]
Here, as the manufacturing method of the main skin piece SP1, various procedures can be taken in addition to the manufacturing method described above. For example, in the manufacturing method (2) of the modified example 1 shown in FIG. 8, the main skin piece SP1, the elastic material 30, and the back surface material 31 are overlapped. Then, the first stitch 21 and the second stitch 22 are formed in this order so as to sew these (SP1, 30, 31). In this way, in the manufacturing method (2), the quilted main skin piece SP1 can be manufactured by using both the first stitch 21 and the second stitch 22 for the quilting stitch. In this modification, the entangled portions 21z and 22z move in the insertion hole 40 while elastically expanding and contracting the elastic material 30 under the tension of the corresponding stitches.

[Modification 2 (Manufacturing method (3))]
In addition to the above-mentioned configurations, the main skin piece may have various configurations. For example, in the seat cover 6Sa of the second modification shown in FIG. 9, the first stitch 21 and the second stitch 22 are formed in this order on the main skin piece SP1 itself by the manufacturing method (3). In this way, in the manufacturing method (3), both the first stitch 21 and the second stitch 22 can be used for the design, and the main skin piece SP1 has a relatively simple structure in which the elastic material and the back surface material are omitted. ing.

The leather product of the present embodiment is not limited to the above-described embodiment, and various other embodiments may be adopted. In this embodiment, the configurations (shape, dimensions, formation positions, number of formations, intersection positions, extension directions, etc.) of the first stitch 21 (23) and the second stitch 22 (24) are illustrated, but the configurations of each stitch are illustrated. It is not intended to be limited. For example, each stitch can take various shapes such as a linear shape, a wavy shape, and a zigzag shape in addition to a curved shape, and can be crossed at one or a plurality of places according to the shape of each stitch. Further, each stitch may have a different appearance due to a difference in fineness and shape (whether it is fluffy, etc.) in addition to the color. Each stitch can then be formed at an appropriate position on the seat cover, for example on at least one of each skin piece.

Further, in the present embodiment, the configuration of the insertion hole 40 is illustrated, but it is not intended to limit the configuration of the insertion hole. For example, the insertion hole may have an elongated hole shape or an elliptical shape that is long in the direction along one of the virtual lines, or may have various geometric shapes. The opening size of the insertion hole can be specified by the diameter dimension in the case of a circular shape, and can be specified by the area of the opening portion in the case of other shapes. It is also possible to arrange the intersecting portions of three or more stitches in the insertion holes. Further, the needle drop points can be formed at different positions in the insertion hole. For example, the first needle drop point can be set at an appropriate position including the center of the insertion hole, and does not necessarily have to be set on the first virtual line. Further, the second needle drop point is set according to the setting position of the first needle drop point, and it is desirable that the second needle drop point is outside the basic area, but it is not always necessary to set it on the second virtual line. The first needle drop point can be set in any of the first to fourth regions. Further, it is desirable that the second needle drop point is set in a region opposite to the region in which the first needle drop point is set, but it is not always necessary to set the second needle drop point in the region facing the first needle drop point.

Further, in the present embodiment, the configuration of the present embodiment has been described by taking the vehicle seat 2 as an example, but the configuration of the present embodiment can be applied to various leather products provided with leather. Examples of this type of leather product include vehicle interiors, household interiors, and clothing miscellaneous goods such as bags and bags. In addition to vehicle seats, various members such as doors, instrument panels, ceilings, and consoles can be exemplified as vehicle interiors, and the configuration of this embodiment is mounted on vehicles such as vehicles, aircraft, trains, and ships. Applicable to vehicle interiors. Further, in the vehicle seat, in addition to the seat back, the configuration of the present embodiment can be applied to the seat covers of various seat constituent members such as seat cushions, headrests and armrests. The composition of each stitch and the insertion hole can be appropriately changed according to the type of leather product.

2 Vehicle seat (leather product of the present invention)
4 Seat cushion 6 Seat back 8 Headrest 6F Seat frame 6P Seat pad 6a Seating part 6b Bank part 6S Seat cover SP1 Main skin piece (leather of the present invention)
SP2, SP3 Side skin piece 21 1st stitch 21x 1st needle thread 21y 1st bobbin thread 21z entangled part 22 2nd stitch 22x 2nd needle thread 22y 2nd bobbin thread 22z Another entangled part 23 Left curved stitch 24 Right Curved stitch 30 Elastic material 31 Back material 40 Insertion hole 40C Center of insertion hole 41A Basic area 41 First needle drop point 42 Second needle drop point 51 First area (specific area of the present invention)
52 Second region (other region of the present invention)
53 Third area 54 Fourth area VL1 First virtual line VL2 Second virtual line 21A First stitch of the conventional example 22A Second stitch of the conventional example 41X, 42X Needle drop point of the conventional example

Claims (6)

In a leather product in which a first stitch and a second stitch having a different appearance from the first stitch intersect each other on the leather forming the appearance.
The leather has insertion holes penetrating in the thickness direction overlapping at the intersection of the first stitch and the second stitch.
In the insertion hole, the entangled portion of the needle thread and the bobbin thread forming the first stitch and another entangled portion of the needle thread and the bobbin thread forming the second stitch are adjacent to each other by the tension received from the corresponding stitch. Or leather products that are placed in close proximity. The leather product according to claim 1, wherein the insertion hole is formed in a circular shape centered on an intersection of the first stitch and the second stitch. The leather product according to claim 1 or 2, wherein the insertion hole has an opening size capable of inserting both the entangled portion and the other entangled portion. In the method for manufacturing a leather product according to any one of claims 1 to 3,
After forming the insertion hole in the leather at a position corresponding to the intersection of the first stitch and the second stitch,
When the first stitch and the second stitch are formed by the sewing machine in this order, the first needle drop point of the sewing machine needle forming the entangled portion and the other entangled portion are formed in the insertion hole. Set the second needle drop point of the sewing machine needle and
A method for manufacturing a leather product, in which a region from the first needle drop point to the center of the insertion hole is set as a basic region, and the second needle drop point is set in an insertion hole portion other than the basic region. The insertion holes formed in a circular shape centered on the intersection of the first stitch and the second stitch are defined as a first virtual line serving as a formation position of the first stitch and a formation position of the second stitch. Divide into four areas by the second virtual line
The production of the leather product according to claim 4, wherein the basic region is set in a specific region among the four regions, and the second needle drop point is set in another region facing the specific region. Method. The leather in which the insertion hole is formed, the elastic material that can be elastically expanded and contracted, and the surface-shaped back surface material are laminated in this order, and the procedure is one of (1) and (2) below. The method for producing a leather product according to claim 4 or 5, wherein the leather product is sewn into a quilt shape.
(1) After the first stitch is formed on the leather, the leather, the elastic material, and the back surface material are sewn by the second stitch.
(2) The leather, the elastic material, and the back surface material are sewn by both the first stitch and the second stitch.

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