JP7190274B2 - Skin material stitch structure and manufacturing method for vehicle interior material - Google Patents

Description

The present invention relates to a skin material stitch structure of decorative stitches applied to a skin material covering a base material in a vehicle interior material, and includes a skin material in which decorative stitches are applied to a base material. The present invention relates to a method for manufacturing a vehicle interior material.

Patent Literature 1 below describes a door trim of a side door for a vehicle as an interior material for a vehicle, and decorative stitching (stitching by sewing) is applied to a member constituting the door trim. . In recent years, for the purpose of producing a sense of luxury, decorative stitches are often used for vehicle interior materials, such as the door trim described in Patent Document 1 below.

U.S. Pat. No. 8,071,002

Decorative stitches such as those described above are often provided at positions that are easily visible to the passengers of the vehicle, and are required to have a good appearance. For example, there is a case where the upholstery material is attached to a base material having a main body portion facing the interior of the vehicle and an upstanding wall portion erected from the outer edge of the main body portion so as to involve the upright wall portion. In particular, when the upright wall is covered with the skin material, the skin material is often pulled and wrapped around the upright wall to be attached. When the decorative stitches are applied in a straight line from the main body to the vertical wall, the decorative stitches are loosened or slack in the portion covering the vertical wall from the corner, which is the boundary between the main body and the vertical wall. may occur, and the stitch thread may float from the upholstery material. In particular, such a phenomenon is likely to occur when the decorative stitches are slanted with respect to the extending direction of the corners.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to suppress floating of stitch threads of decorative stitches and to maintain a good appearance in a vehicle interior material having decorative stitches. and

In order to solve the above problems, the skin material stitch structure of the present invention includes:
A stitch structure of decorative stitches applied to a skin material covering a base material in a vehicle interior material,
The base material has a main body portion facing the interior of the vehicle interior, and an upright wall portion standing from at least a part of the outer edge of the main body portion,
The skin material covers the base material by wrapping the standing wall part up to the back side thereof,
The decorative stitch has a line shape extending continuously from a portion covering the main body portion of the skin material to a portion covering the standing wall portion, and a main body stitch portion applied to the portion covering the main body portion; and a standing wall stitch portion applied to a portion covering the standing wall portion,
The main body stitch portion extends at an angle with respect to a direction perpendicular to the corner portion, which is a direction perpendicular to the direction in which the corner portion, which is the boundary portion between the main body portion and the standing wall portion, extends,
The vertical wall stitch portion extends at an angle smaller than the angle formed with respect to the corner orthogonal direction of the main body stitch portion with respect to the corner orthogonal direction.

When the skin material rolls up the vertical wall portion to cover the base material, the skin material is pulled and rolled up to the back side of the vertical wall portion. That is, by pulling the skin material, the thickness of the skin material near the boundary between the main body and the vertical wall becomes smaller than the thickness of the portion covering the main body. Therefore, it is considered that the stitch thread of the decorative stitches is likely to become loose in the portion covering the standing wall portion from the vicinity of the boundary between the main body portion and the standing wall portion. In the skin material stitch structure configured as described above, the stitches in the portion covering the standing wall portion (standing wall portion stitching portion) extend in the extending direction of the stitches in the portion covering the main body portion of the base material in the skin material (main body portion stitching portion). It has a structure in which the extending direction is bent. The extending direction of the vertical wall stitch portion is brought closer to the direction orthogonal to the extending direction of the boundary (corner) between the main body portion and the vertical wall portion, that is, the direction in which the upholstery material is stretched. In other words, in the skin material stitch structure of this configuration, not only the skin material but also the stitch thread of the vertical wall stitch portion is pulled in the direction perpendicular to the corner, thereby suppressing the loosening and slackness of the stitch thread and suppressing the lifting of the stitch thread. be able to. Therefore, according to the upholstery stitch structure of this configuration, it is possible to maintain a good appearance in the vehicle interior material in which the upholstery material to which the decorative stitches are applied is attached to the base material. In addition, in the upholstery stitch structure of this configuration, the closer the extending direction of the vertical wall stitch part is to the corner orthogonal direction, that is, the direction in which the skin material is pulled, the more effectively the slackness and slackness of the stitch thread is. can be suppressed.

In addition, in the above-described upholstery stitch structure, the bent portion of the decorative stitch is aligned with the corner of the base material, so that the occupants do not feel uncomfortable due to the bent stitch and the appearance is not deteriorated. It has become.

In the above configuration, the upholstery material having the decorative stitches bent in a state before being rolled up to cover the back side of the standing wall portion may be attached to the base material.

According to the upholstery stitch structure having this configuration, it is possible to easily realize a structure in which the extending direction of the standing wall stitch portion is bent with respect to the extending direction of the main body stitch portion.

Further, in the above configuration, the stitch pitch of the standing wall stitch portion may be smaller than the stitch pitch of the main body stitch portion.

According to the upholstery stitch structure having this configuration, the pitch of the vertical wall stitch portions is small, so that loosening of the stitch thread can be suppressed more effectively. In addition, in the skin material stitch structure of this configuration, the change in stitch pitch is aligned with the corner of the base material, so that the passenger does not feel uncomfortable due to the change in stitch pitch, and the appearance is not deteriorated. ing.

In addition, in order to solve the above problems, the method for producing a vehicle interior material of the present invention comprises:
An interior material for a vehicle, comprising a base material having a main body portion facing the inside of the vehicle interior and an upstanding wall portion erected from at least a part of the outer edge of the main body portion, covered with a skin material having decorative stitches. A manufacturing method comprising:
forming a line shape extending continuously from a portion of the skin material covering the main body portion to a portion covering the standing wall portion and bending at a portion corresponding to a corner portion which is a boundary portion between the main body portion and the standing wall portion; The main body stitch portion applied to the portion covering the main body portion extends obliquely with respect to a corner orthogonal direction that is perpendicular to the direction in which the corner portion extends, and is applied to the portion covering the standing wall portion. The decorative stitches are arranged so that an angle formed with the corner orthogonal direction is smaller than an angle formed with the corner orthogonal direction of the main body stitch portion. a decorative stitch sewing step of applying to the skin material;
A skin material attaching step of attaching the skin material to which the decorative stitches have been applied to the base material in a state where the upright wall portion of the base material is wrapped up to the back side thereof to cover the base material;
characterized by comprising

The method for manufacturing the vehicle interior material having this configuration can easily manufacture the vehicle interior material adopting the skin material stitch structure described above. In other words, in the vehicle interior material manufactured by this manufacturing method, not only the upholstery material but also the stitch thread of the vertical wall stitch portion is pulled in the direction perpendicular to the corner, thereby suppressing the loosening and slackness of the stitch thread. floating can be suppressed. Therefore, according to the manufacturing method having this configuration, it is possible to maintain a good appearance in the vehicle interior material in which the base material is covered with the skin material on which the decorative stitches are applied.

In the above configuration, the decorative stitch sewing step may be configured such that the stitch pitch of the vertical wall portion stitch portion is smaller than the stitch pitch of the main body portion stitch portion.

According to the manufacturing method having this configuration, as described above, the pitch of the vertical wall stitch portion is small, so that the loosening of the stitch thread can be suppressed more effectively.

Further, in the above configuration, the decorating stitch sewing step may be configured such that the tension during stitch sewing in the vertical wall portion stitch portion is higher than the tension during stitch sewing in the main body portion stitch portion.

Decorative stitches are usually sewn with a relatively small tension so as not to cut into the upholstery material. In the manufacturing method with this configuration, even if the thickness of the portion covering the standing wall from the corner of the skin becomes small when the upholstery is attached to the standing wall, the tension of the stitch corresponding to that portion is increased. , the loosening of the stitch thread at that portion can be suppressed more effectively.

According to the present invention, it is possible to suppress floating of the stitch thread of the decorative stitch and maintain a good appearance of the vehicle interior material having the decorative stitch.

1 is a view showing a door trim as an interior material for a vehicle in which the skin material stitch structure of the embodiment of the present invention is adopted, viewed from the inside of the passenger compartment; FIG. 2 is a front view of the second ornament board shown in FIG. 1; FIG. 2 is a perspective view of a second ornament board shown in FIG. 1; FIG. 1 is an enlarged perspective view showing a stitch structure of an upholstery material according to an embodiment of the present invention; FIG. FIG. 11 is a developed view of the skin material of the second ornament board; 1 is a cross-sectional view of a skin material stitch structure according to an embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as modes for carrying out the present invention. It should be noted that the present invention is not limited to the following examples, and can be implemented in various modes with various modifications and improvements based on the knowledge of those skilled in the art.

<Configuration of vehicle interior material>
The skin material stitch structure of the embodiment of the present invention is employed in a door trim 10 as an interior material for a vehicle. First, a door trim 10, which is a vehicle interior material, will be briefly described with reference to FIG. Although not shown, the door trim 10 constitutes a portion of a vehicle side door on the interior side of the vehicle, and is attached to a door inner panel from the interior side of the vehicle. The door trim 10 is mainly composed of a generally rectangular trim board 20. In addition to the trim board 20, an inside handle 21 provided on the trim board 20, an armrest 22, a door grip 23, a door pocket 24, It is configured including various functional parts such as the speaker grill 25 and the like.

The trim board 20 is formed by assembling a plurality of board members together, and is mainly composed of a lower board 30, a middle board 32, a first ornament board 34, a second ornament board 36, an armrest board 38 and an upper board 40. . Note that the first ornament board 34 and the second ornament board 36 are arranged above the middle board 32 in the longitudinal direction of the vehicle. The inside handle 21 is provided above the first ornament board 34 . The armrest 22 is formed by fastening an armrest board 38 to the upper side of the middle board 32 (approximately in the center of the trim board 20). The door grip 23 is provided on the vehicle front side of the armrest 22 by fastening a grip cover 42 extending over the front end of the armrest board 38 from above the first ornament board 34 . Although detailed illustration is omitted, the door pocket 24 is formed by a lower board 30 and a middle board 32 extending from the lower board 30 to the outside of the passenger compartment. The speaker grille 25 is provided on the vehicle front side of the lower board 30 . A decorative plate 44 is attached between the second ornament board 36 and the upper board 40 .

The above-described first ornament board 34 and second ornament board 36 are constructed by attaching a skin material to a base material. In the second ornament board 36, decorative stitches are applied to the skin material, and the skin material stitch structure of the present invention is adopted for the decorative stitches. The second ornament board 36 will be described in detail below.

The second ornament board 36 has a base material 50 and a skin material 52 covering the base material 50, as shown in FIGS. The base member 50 includes a main body portion 50a forming a surface on the vehicle interior side, a standing wall portion 50b erected from the outer edge of the main body portion 50a on the rear side of the vehicle to form a surface on the rear side of the vehicle, and the main body portion 50a. Attachment pieces 50c are provided so as to protrude from each of the upper edge and the lower edge for attachment to another board member. Further, the main body portion 50a is elongated in the longitudinal direction of the vehicle, but protrudes upward from the rear side of the vehicle and extends to the upper end of the door trim 10 as shown in FIG. ing.

In addition, the skin material 52 is a sheet-like member composed of a skin layer 54 made of a synthetic resin material such as an olefin elastomer or polyvinyl chloride, genuine leather, or the like, and a cushion layer 56 made of urethane foam or the like. (See FIG. 6), which is a slightly bulky and flexible member. Decorative stitches are applied to this skin material 52 . Specifically, the upholstery material 52 is provided with three linear stitches (decorative stitches) 60A, 60B, and 60C.

As shown in FIG. 3, these three stitches 60A, 60B, 60C continuously extend from the portion of the skin material 52 covering the body portion 50a of the base material 50 to the vertical wall portion 50b. As shown in FIG. 2, the main body stitch portion 62 applied to the portion of the skin material 52 that covers the main body portion 50a extends upward on the vehicle rear side. In other words, the main body stitch portion 62 extends in the direction orthogonal to the corner portion 50d, which is the boundary portion between the main body portion 50a and the standing wall portion 50b (the two-dot chain line L _A and L A in FIG. 2). L _B and L _C ). The angles formed by the main body stitch portions 62 with respect to the corner orthogonal directions L _A , L _B , and L _C are referred to as main body stitch angles θ _A , θ _B , and θ _C , respectively.

The three stitches 60A, 60B, 60C are bent from the vicinity of the corner 50d as shown in FIG. More specifically, the vertical wall stitch portions 64 applied to the portion of the upholstery 52 covering the vertical wall portion 50b extend from the vicinity of the corner portion 50d to the corner orthogonal directions _LA , _LB , and L. It is oriented close to _C. In more detail, if the angles formed with respect to the corner orthogonal directions L _A , L _B , and L _C of the vertical wall stitch portion 64 are called vertical wall stitch angles δ _A , δ _B , and δ _C , as shown in FIG. Moreover, the vertical wall stitch portions 64 are extended so that the vertical wall stitch angles δ _A , δ _B , δ _C are smaller than the main body stitch angles θ _A , θ _B , θ _C .

_In addition, when comparing the stitch pitch (the interval at which the needle is inserted during sewing) P1 of the _main body stitch portion 62 and the stitch pitch P2 of the vertical wall stitch portion 64, the stitch pitch P2 of the _vertical wall stitch portion 64 is It is made smaller _than the stitch pitch P1 of the main body stitch portion 62 .

<Method for producing vehicle interior material (second ornament board)>
Next, a method for manufacturing the above-described second ornament board 36 will be described. First, the base material 50 of the second ornament board 36 is molded. The base material 50 is formed by injection molding using a synthetic resin material such as polypropylene, or a material obtained by mixing fibers (such as bast plant fibers such as kenaf) into a synthetic resin material.

Subsequently, the skin material 52 is molded. As shown in FIG. 5, the skin material 52 is formed by stitching (lockstitching) 70 a first skin material 52a and a second skin material 52b, which are two cut members, together. However, before sewing together, the three decorative stitches 60A, 60B, and 60C described above are applied to the first skin material 52a (decorative stitch sewing step). These three stitches 60A, 60B, 60C are bent as shown in FIG. Specifically, in the skin material 52 , it is applied in a bent line shape at a portion corresponding to the corner 50 d of the base material 50 . More specifically, the main body stitch portions 62 of the three stitches 60A, _60B , _60C extend obliquely with respect to the corner orthogonal directions _LA , LB, LC, and the vertical wall stitch portions 64 are , the vertical wall stitch angles δ _A , δ _B , δ _C are smaller than the main body stitch angles θ _A , θ _B , θ _C . In other words, the vertical wall stitch portion 64 extends so as to approach the end of the upholstery material 52 in a direction perpendicular to it.

Also, as described above, the three stitches 60A, 60B, and 60C have their stitch pitches changed in the middle, and the stitch pitch P ₂ (4 mm in this embodiment) of the vertical wall stitch portion 64 is , the stitch pitch P ₁ (5 mm in this embodiment) of the main body stitch portion 62 . Furthermore, the three stitches 60A, 60B, and 60C are changed in tension during stitch sewing. Specifically, the tension T ₂ of the standing wall stitching portion 64 is applied to the body stitching portion 62 slightly before the standing wall stitching portion 64 (20 mm to 30 mm in this embodiment). It is higher _than the tension T1 of the front side portion. In this embodiment, the tension T1 at the main body stitch portion 62 is _3.4N to _4.5N , and the tension T2 at the vertical wall stitch portion 64 is _equal to the tension T1 at the main body stitch portion 62. On the other hand, it is set to 3.9N to 5.0N so as to be higher by about 0.5N.

Next, the upholstery 52 on which the decorative stitches 60A, 60B, and 60C are applied as described above is attached to the base material 50 (upholstery attachment step). Specifically, the skin material 52 is attached to the base material 50 with an adhesive. However, the portion on the front side of the vehicle and the portion on the rear side of the vehicle are attached so as to cover the base material 50 by winding up to the back side of the base material 50 . Furthermore, since the vertical wall portion 50b is formed on the rear side of the vehicle of the base material 50, the upholstery material 52 is stuck by winding the vertical wall portion 50b to the rear side. Then, the skin material 52 is pulled in a direction orthogonal to the outer edge in order to wind up the back side of the base material 50 . That is, when attaching the skin material 52 to the vehicle rear side portion of the base material 50 on which the standing wall part 50b is formed, the skin material 52 is attached in a direction perpendicular to the corner part 50d of the base material 50 (corner orthogonal direction). is pulled to cover the upright wall portion 50b, and is extended to the back side of the upright wall portion 50b for attachment. In particular, the second ornament board 36 has a shape in which a portion on the vehicle rear side of the base material 50 protrudes upward. It is attached by pulling upward. Thus, the second ornament board 36 is completed.

<Effects of the present invention and other aspects>
As described above, when attaching the skin material 52 to the vehicle rear side portion of the base material 50 on which the standing wall part 50b is formed, The upholstery material 52 is pulled to cover the upright wall portion 50b, extended to the rear side of the upright wall portion 50b, and attached. Therefore, as shown in FIG. 6, the thickness of the cushion layer 56 differs between the portion of the base material 50 attached to the main body portion 50a and the portion attached to the standing wall portion 50b. That is, the thickness of the cushion layer 56 is thinner at the portion attached to the standing wall portion 50b than at the portion attached to the main body portion 50a. Therefore, conventionally, in the decorative stitch extending from the main body portion 50a to the standing wall portion 50b, the stitch thread is loosened or loosened at the portion covering the standing wall portion 50b from the corner portion 50d. There was a case where I would do it. In particular, such a phenomenon is likely to occur in the case where the decorative stitch extends obliquely with respect to the corner 50d and is continuously applied in a straight line up to the standing wall 50b.

In addition, when the vehicle door is closed, the standing wall portion 50b overlaps the pillar of the vehicle body and is not visible to the passenger. It is desirable that 50b also maintain a good appearance.

In the upholstery stitch structure of this embodiment, the stitches 60A, 60B, and 60C are bent, and the extending direction of the vertical wall stitch portion 64 is brought closer to the corner orthogonal direction. That is, the extending direction of the standing wall stitch portion 64 is brought closer to the direction in which the upholstery material 52 is pulled when it is attached. Therefore, the stitch threads of the stitches 60A, 60B, and 60C are also pulled together with the upholstery material 52, and as shown in FIG. It is designed to prevent this from happening. In addition, the vertical wall stitch portion 64 has a smaller stitch pitch and a higher tension than the main body stitch portion 62, so that the stitch thread at the vertical wall stitch portion 64 is more slack and slack. It can be further suppressed, and a good-looking state can be effectively maintained.

In addition, the second ornament board 36 adopting the skin material stitch structure of this embodiment has a shape in which the portion of the base material 50 on the rear side of the vehicle protrudes upward, as described above. For covering, the upholstery material 52 is attached while being pulled toward the rear side of the vehicle, the front side of the vehicle, and the upper side. Therefore, since the thickness of the skin material 52 is particularly thin in the portion that protrudes upward from the base material 50, the portion where the stitch 60A extending from that portion is provided has a particularly high stitch thread thickness. Although it is a place where floating is likely to occur, the upholstery stitch structure of this embodiment can effectively suppress the floating of the stitch thread.

From the viewpoint of suppressing slackness and slack, it is desirable that the extending direction of the standing wall stitch portion 64 coincide with the direction orthogonal to the corner portion. It is desirable to determine the extending direction of the vertical wall stitch portion 64 in consideration of both suppression of loosening and appearance.

The stitch structure of the skin material and the method of manufacturing the vehicle interior material of this embodiment have been adopted for the door trim of the vehicle side door, but can also be adopted for other vehicle interior materials. Furthermore, it is not limited to interior materials for vehicles, and can be used for interior materials for other vehicles such as aircraft and ships.

DESCRIPTION OF SYMBOLS 10... Door trim [interior material for vehicles], 20... Trim board, 36... Second ornament board, 50... Base material, 50a... Body part, 50b... Standing wall part, 50d... Corner part, 52... Skin material, 60A, 60B , 60C...stitch [decorative stitch], 62...body part stitch part, 64...standing wall part stitch part

Claims (6)

A stitch structure of decorative stitches applied to a skin material covering a base material in a vehicle interior material,
The base material has a main body portion facing the interior of the vehicle interior, and an upright wall portion standing from at least a part of the outer edge of the main body portion,
The skin material covers the base material by wrapping the standing wall part up to the back side thereof,
The decorative stitch has a line shape extending continuously from a portion covering the main body portion of the skin material to a portion covering the standing wall portion, and a main body stitch portion applied to the portion covering the main body portion; and a standing wall stitch portion applied to a portion covering the standing wall portion,
The main body stitch portion extends at an angle with respect to a direction perpendicular to the corner portion, which is a direction perpendicular to the direction in which the corner portion, which is the boundary portion between the main body portion and the standing wall portion, extends,
The upright wall stitch portion extends at an angle smaller than the angle formed with respect to the corner orthogonal direction than the angle formed with the main body stitch portion relative to the corner orthogonal direction. stitch construction. 2. The upholstery stitch structure according to claim 1, wherein said upholstery material having said decorative stitches bent in a state before being rolled up to cover the back side of said standing wall portion is attached to said base material. 3. The upholstery stitch structure according to claim 1, wherein a stitch pitch of said standing wall stitch portion is smaller than a stitch pitch of said main body stitch portion. An interior material for a vehicle, comprising a base material having a main body portion facing the inside of the vehicle interior and an upstanding wall portion erected from at least a part of the outer edge of the main body portion, covered with a skin material having decorative stitches. A manufacturing method comprising:
forming a line shape extending continuously from a portion of the skin material covering the main body portion to a portion covering the standing wall portion and bending at a portion corresponding to a corner portion which is a boundary portion between the main body portion and the standing wall portion; The main body stitch portion applied to the portion covering the main body portion extends obliquely with respect to a corner orthogonal direction that is perpendicular to the direction in which the corner portion extends, and is applied to the portion covering the standing wall portion. The decorative stitches are arranged so that an angle formed with the corner orthogonal direction is smaller than an angle formed with the corner orthogonal direction of the main body stitch portion. a decorative stitch sewing step of applying to the skin material;
A skin material attaching step of attaching the skin material to which the decorative stitches have been applied to the base material in a state where the upright wall portion of the base material is wrapped up to the back side thereof to cover the base material;
A method of manufacturing a vehicle interior material comprising: 5. The method of manufacturing an interior material for a vehicle according to claim 4, wherein in the decorative stitch sewing step, the stitch pitch of the vertical wall stitch portion is made smaller than the stitch pitch of the main body stitch portion. 6. The vehicle interior material according to claim 4, wherein in the decorative stitch sewing step, tension during stitch sewing in the standing wall stitch portion is made higher than tension during stitch sewing in the main body stitch portion. manufacturing method.

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