Sewing products

Abstract

Where sewing lines on sewn products intersect, a problem could arise where the appearance becomes unsightly. [Solution] One aspect of the invention is a sewn product comprising: a sheet-like first base material and a second base material, each having a first edge and a second edge intersecting the first edge; a sheet-like third base material having a third edge; a first thread for sewing the first base material and the second base material together along the first edge such that the first edge is included in the first seam allowance; and a second thread for sewing the first base material and the second base material together to the third base material with the portions of the first base material and the second base material other than the first seam allowance open, such that the second edge and the third edge are included in the second seam allowance, wherein a first notch is formed within the first seam allowance through which the second thread passes, extending from the first edge towards the first thread and continuing to the second edge, and the portions of the first base material, the second base material and the third base material other than the second seam allowance, sewn together by the second thread, are open.

Description

Technical Field

[0001] This disclosure relates to sewn products.

Background Art

[0002] In sewn products, there may be provided a portion where sewing lines for sewing sheet-like base materials cross each other in a T-shape, a cross-shape, or the like (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] At the portion where the sewing lines of the sewn product cross, there may arise a problem that the appearance becomes poor.

Means for Solving the Problems

[0005] One aspect of the invention includes a sheet-like first base material and a second base material each having a first edge and a second edge intersecting the first edge, a sheet-like third base material having a third edge, a first thread for sewing the first base material and the second base material along the first edge so that the first edge is included in a first sewing allowance, and a second thread for sewing the first base material and the second base material to the third base material in a state where portions other than the first sewing allowance of the first base material and the second base material are open so that the second edge and the third edge are included in a second sewing allowance. A first notch is formed in the first sewing allowance to notch a portion through which the second thread passes from the first edge toward the first thread and reach the second edge. The sewn product is such that portions other than the second sewing allowance of the first base material, the second base material, and the third base material sewn together by the second thread are open.

Brief Description of the Drawings

[0006] [Figure 1] Figure 1 is a perspective view of a sewn product according to the first embodiment. [Figure 2] Figure 2 is a side cross-sectional view of a sewn product. [Figure 3] Figure 3 is a perspective view of the sewn product from the reverse side. [Figure 4] Figure 4 shows plan views of the first and second substrates. [Figure 5] Figure 5 is a perspective view of the base substrate and the third substrate, which are stacked with their front surfaces facing each other. [Figure 6] Figure 6 is a perspective view of the base material and the third material, which are sewn together with their front sides facing each other. [Figure 7] Figure 7A is a cross-sectional view of the base substrate and the third substrate with their front surfaces overlapping, and Figure 7B is a cross-sectional view of line AA in Figure 6. [Figure 8] Figure 8 is a perspective view of a sewn product according to the second embodiment. [Figure 9] Figure 9 is a perspective view of the sewn product from the reverse side. [Figure 10] Figure 10 is a perspective view from the base substrate side of the base substrate and the third substrate, which are stacked with their front surfaces facing each other. [Figure 11] Figure 11 is a perspective view from the third substrate side of the base substrate and the third substrate, which are stacked with their front surfaces facing each other. [Figure 12] Figure 12 is a perspective view of the base material and the third material, with their front sides facing each other and sewn together. [Figure 13] Figure 13A is a cross-sectional view of the base substrate and the third substrate with their front surfaces overlapping, and Figure 13B is a cross-sectional view of line BB in Figure 12. [Figure 14] Figure 14A is a perspective view of the sewn product as seen from the back according to the third embodiment, and Figure 14B is a cross-sectional view of line CC in Figure 14A. [Figure 15] Figure 15 is a perspective view of a sewn product according to the fourth embodiment. [Figure 16]Figure 16A is a cross-sectional view of the base material and the third material with their front surfaces overlapping, and Figure 16B is a cross-sectional view of the base material and the third material with their front surfaces facing each other and sewn together. [Figure 17] Figure 17A is a cross-sectional view of the base material and the third material sewn together with their front sides facing each other, and Figure 17B is a cross-sectional view of the base material and the third material sewn together with their front sides facing each other. [Figure 18] Figure 18 is a perspective view of the sewn base material and third material of a sewn product according to another embodiment. [Figure 19] Figure 19 is a perspective view of the base substrate and the third substrate according to another embodiment. [Figure 20] Figure 20A is a plan view of the base material as seen from the reverse side in a sewn product according to another embodiment, and Figure 20B is a cross-sectional view along line DD in Figure 20A. [Figure 21] Figure 21A is a plan view of the base material as seen from the reverse side in a sewn product according to another embodiment, and Figure 21B is a cross-sectional view along line EE in Figure 21A. [Modes for carrying out the invention]

[0007] [First Embodiment] Figure 1 shows the sewn product 10 of this embodiment. The sewn product 10 is made by sewing together a plurality of sheet-like base materials 21. The use and shape of the sewn product 10 are not limited to any particular one. The sewn product 10 may be used, for example, in clothing, bags, or covers. In this embodiment, the sewn product 10 is provided on the headrest 91 of a seat 90 (for example, a seat for a vehicle or building) and is used as a bag-shaped outer material that covers a core part 92 (see Figure 2) such as a foamed molded body. The sewn product 10 may also be used, for example, as an outer material for the seat 90 or an outer material for an armrest.

[0008] In the example of this embodiment, the base materials 21 are sewn together at their edges such that the front surfaces of the base materials 21 that are exposed outside the bag-shaped sewn product 10 overlap each other (see FIG. 2). The sewn-together base materials 21 are bent in opposite directions along the sewing line L (seam, see FIG. 3), and the overlapping edges of the base materials 21 (i.e., the sewing allowance 25) project inside the sewn product 10 (see FIG. 2).

[0009] In addition, in the example of this embodiment, as shown in FIG. 2, an opening 17K for protruding a stay 12 for attaching the headrest 91 to the backrest portion 93 of the seat 90 is formed on the lower surface of the sewn product 10, and a raw material injection port 20K into which the raw material of the core portion 92 is injected when the core portion 92 is molded inside the sewn product 10 is also formed. In the example of this embodiment, when the sewn product 10 is manufactured by sewing the base materials 21 together, it is sewn in a turned-over state with the back surface facing outward, and then, using the raw material injection port 20K as a turning opening, it is turned right side out.

[0010] As shown in FIG. 3, the sewn product 10 may be provided with a portion where the sewing line L (seam) that sews the base materials 21 together intersects in a T-shape or a cross-shape. In the example of this embodiment, an intersection portion P1 where the sewing line L intersects in a T-shape is provided. The intersection portion P1 is at the boundary of the three base materials 21, namely the first base material 21A, the second base material 21B, and the third base material 21C (see FIG. 1).

[0011] As shown in FIG. 3, when the sewn product 10 is viewed from the back side, at the intersection portion P1, the sewing allowance 25 is also arranged in a T-shape. The first base material 21A and the second base material 21B are sewn together by the first thread T1. The first thread T1 forms a linear seam along the first edge E1 (see FIGS. 3 and 4) of each of the first base material 21A and the second base material 21B such that the first edge E1 is included in the first sewing allowance 25A. Hereinafter, the first base material 21A and the second base material 21B sewn together by the first thread T1 will be referred to as the base base material 21Z. In the example of this embodiment, the base base material 21Z is arranged on the front surface of the headrest 91.

[0012] The base material 21Z (first material 21A and second material 21B) and the third material 21C are sewn together by a second thread T2. The second thread T2 forms a linear stitch (sewing line L) along the second edge E2 (see Figures 3 and 4) of the first material 21A and the second material 21B, and the third edge E3 (see Figure 3) of the third material 21C, so that these edges are included in the second seam allowance 25B. The first material 21A and the second material 21B are sewn to the third material 21C by the second thread T2 with the first seam allowance 25A crease, and spread out to opposite sides so that their front surfaces face outwards from the sewn product 10 (with the parts other than the first seam allowance 25A open).

[0013] Specifically, the sewing of the first base material 21A, the second base material 21B, and the third base material 21C is carried out as follows. First, as shown in Figure 4, the first base material 21A and the second base material 21B are prepared, each having a first edge E1 and a second edge E2 that intersects (extends in the direction of intersection) with the first edge E1. The first base material 21A and the second base material 21B are sewn together with a first thread T1 along the first edge E1 so that their respective first edges E1 overlap (see Figure 5). This forms a first seam allowance 25A that includes the first edge E1, and also forms the base base material 21Z. At this time, the respective second edges E2 of the first base material 21A and the second base material 21B are positioned on each other's extension lines (for example, aligned in a straight line).

[0014] As shown in Figure 4, the first base material 21A and the second base material 21B have a notch 30 (first notch 30A) formed in which the corner between the first edge E1 and the second edge E2 is cut out. In this embodiment, the first notch 30A is rectangular (for example, a long rectangle elongated in the direction in which the first edge E1 extends). As shown in Figure 5, when the first base material 21A and the second base material 21B are sewn together to form the first seam allowance 25A, the first notch 30A is positioned within the first seam allowance 25A and is located at the longitudinal end of the first seam allowance 25A. The first notch 30A is formed so as to cut out within the first seam allowance 25A from the first edge E1 toward the first thread T1 and extend to the second edge E2. Therefore, in the first seam allowance 25A, the amount of protrusion (width of the first seam allowance 25A) that protrudes from the stitch of the first thread T1 to the inside (back side) of the sewn product 10 is reduced by the first notch 30A at the longitudinal end of the first seam allowance 25A (hereinafter referred to as the "narrow end 30E" as appropriate).

[0015] When the first base material 21A and the second base material 21B are sewn together to form the base base material 21Z, the third base material 21C is placed on top of the base base material 21Z, as shown in the transition from Figure 5 to Figure 7A. Then, as shown in Figure 6, the base base material 21Z and the third base material 21C are sewn together with the second thread T2. At this time, the base base material 21Z and the third base material 21C are sewn together along the second edge E2 and the third edge E3, such that the second edge E2 of the base base material 21Z and the third edge E3 of the third base material 21C overlap. This forms a second seam allowance 25B that includes the second edge E2 and the third edge E3.

[0016] Here, the first notch 30A is provided in the portion of the first seam allowance 25A through which the second thread T2 passes. Therefore, the second thread T2 sews the narrow end 30E of the first seam allowance 25A to the base material 21Z and the third material 21C. At this time, the narrow end 30E is folded and sewn either towards the first material 21A side or the second material 21B side (see Figures 6 and 7B).

[0017] Next, as shown in the change from Figure 6 to Figure 3, the base material 21Z and the third material 21C are spread apart on opposite sides, with their front surfaces facing outwards, using the seam (sewing line L) of the second seam allowance 25B as a fold (the parts other than the second seam allowance 25B are opened). In this way, sewing near the intersection P1 of the sewn product 10 is completed.

[0018] In conventional sewn products, if there is a section where the sewing line L (stitch) that sews the base materials 21 together intersects in a T-shape or the like, for example, the seam allowance may get in the way at that section, causing distortion in the sewing line L and resulting in an unsightly appearance. In contrast, in the sewn product 10 of this embodiment, a first notch 30A is formed within the first seam allowance 25A, and the first notch 30A is provided in the section through which the second thread T2 that forms the second seam allowance 25 passes. Therefore, at the section where the first seam allowance 25A and the second seam allowance 25B intersect, interference or other obstruction of the first seam allowance 25A can be suppressed, and problems such as distortion in the sewing line L can be suppressed. As a result, the unsightly appearance of the sewn product 10 can be suppressed. In particular, since the first notch 30A is formed to a position that reaches the second edge E2 included in the second seam allowance 25B, interference between the first seam allowances 25A can be suppressed, for example, and the appearance of the sewing line L can be further reduced.

[0019] Furthermore, if the entire width of the first seam allowance 25A (the amount of projection from the stitch of the first thread T1 to the back side of the sewn product 10) is made as small as the narrow end 30E, it becomes necessary to reduce the sewing speed (for example, the sewing speed by the sewing machine) overall in order to prevent twisting of the sewing line L. In contrast, in this embodiment, since the notch 30 is formed only in a part (end) of the first seam allowance 25A, it is not necessary to reduce the sewing speed of other parts of the first seam allowance 25A, and a decrease in work efficiency can be suppressed.

[0020] [Second Embodiment] Figure 8 shows a sewn product 10 of the second embodiment. The sewn product 10 of this embodiment differs from the first embodiment in that the third base material 21C is formed by sewing together the fourth base material 21D and the fifth base material 21E.

[0021] As shown in Figures 8 and 9, the sewn product 10 of this embodiment is provided with an intersection P2 where sewing lines L (stitches) that sew the base materials 21 together intersect in a cross shape. The intersection P2 is the boundary between the four base materials 21: the first base material 21A, the second base material 21B, the fourth base material 21D, and the fifth base material 21E.

[0022] As shown in Figure 9, when the sewn product 10 is viewed from the reverse side, the seam allowance 25 is also arranged in a cross shape at the intersection P2. The first base material 21A and the second base material 21B are sewn together with the first thread T1 to form the first seam allowance 25A and the base base material 21Z, which is the same as in the first embodiment described above.

[0023] In this embodiment, the third base material 21C is formed by sewing together the fourth base material 21D and the fifth base material 21E with a third thread T3. The fourth base material 21D and the fifth base material 21E each have a fourth edge E4 and a fifth edge E5 that intersects (extends in the direction of intersecting) the fourth edge E4. The third thread T3 forms a linear stitch along the fourth edge E4 of both the fourth base material 21D and the fifth base material 21E so that the fourth edge E4 of each is included in the third seam allowance 25C. The fourth base material 21D and the fifth base material 21E are formed in the same manner as the first base material 21A and the second base material 21B, and are sewn together in the same manner. In this example, the fourth base material 21D and the fifth base material 21E also have a notch 30 (second notch 30B) similar to the first notch 30A of the first base material 21A and the second base material 21B (see Figure 11).

[0024] The base material 21Z (first material 21A and second material 21B) and the third material 21C (fourth material 21D and fifth material 21E) are sewn together with a second thread T2, similar to the first embodiment described above. The second thread T2 forms a linear stitch (sewing line L) along the second edge E2 and third edge E3 such that the second edge E2 of the first material 21A and the second material 21B (see Figures 3 and 4) and the third edge E3 of the third material 21C (the fifth edge E5 of the fourth material 21D and the fifth material 21E) are included in the second seam allowance 25B. The first base material 21A and the second base material 21B are sewn to the third base material 21C with the second thread T2, with the seam (sewing line L) of the first seam allowance 25A as a fold and the right sides facing outwards from each other (with the parts other than the first seam allowance 25A open). Similarly, the fourth base material 21D and the fifth base material 21E are sewn to the base base material 21Z with the second thread T2, with the seam (sewing line L) of the third seam allowance 25C as a fold and the right sides facing outwards from each other (with the parts other than the third seam allowance 25C open).

[0025] Specifically, the sewing of the first base material 21A, the second base material 21B, the fourth base material 21D, and the fifth base material 21E is carried out as follows. First, as shown in Figure 10, a base base material 21Z is prepared by sewing together the first base material 21A and the second base material 21B in the same manner as in the first embodiment.

[0026] Furthermore, a third base material 21C is prepared by sewing together the fourth base material 21D and the fifth base material 21E. The fourth base material 21D and the fifth base material 21E are sewn together with a third thread T3 along their respective fourth edges E4 so that their fourth edges E4 overlap (see Figure 11). This forms a third seam allowance 25C that includes the fourth edge E4, and also forms the third base material 21C. At this time, the respective third edges E3 of the fourth base material 21D and the fifth base material 21E are positioned on their respective extensions (for example, aligned in a straight line).

[0027] The fourth base material 21D and the fifth base material 21E have a notch 30 (second notch 30B) formed in which the corner between the fourth edge E4 and the third edge E3 (the fifth edge E5 of the fourth base material 21D and the fifth base material 21E) is cut out. In this embodiment, the second notch 30B is rectangular (for example, a long rectangle elongated in the direction in which the fourth edge E4 extends) (for example, it is the same shape and size as the first notch 30A). As shown in Figure 11, when the fourth base material 21D and the fifth base material 21E are sewn together to form the third seam allowance 25C, the second notch 30B is positioned within the third seam allowance 25C and is located at the longitudinal end of the third seam allowance 25C. The second notch 30B is formed within the third seam allowance 25C, cutting out from the fourth edge E4 toward the third thread T3 and extending to the third edge E3. Consequently, the amount of protrusion (width of the third seam allowance 25C) that the third seam allowance 25C protrudes from the stitch of the third thread T3 toward the inside (back side) of the sewn product 10 is reduced by the second notch 30B at the longitudinal end of the third seam allowance 25C (hereinafter referred to as the "narrow end 30E" as appropriate).

[0028] When the fourth base material 21D and the fifth base material 21E are sewn together to form the third base material 21C, the third base material 21C is placed on top of the base base material 21Z, as shown in Figure 13A. At this time, in the example of this embodiment, the first boundary K1 between the first base material 21A and the second base material 21B, which are sewn together by the first thread T1, and the second boundary K2 between the fourth base material 21D and the fifth base material 21E, which are sewn together by the third thread T3, are aligned with each other (the first boundary K1 and the second boundary K2 are positioned on the extensions of each other). Then, in that state, the base base material 21Z is sewn to the third base material 21C.

[0029] Then, as shown in Figure 12, the base material 21Z and the third material 21C are sewn together with the second thread T2. At this time, the base material 21Z and the third material 21C are sewn together along the second edge E2 and the third edge E3, such that the second edge E2 of the base material 21Z and the third edge E3 of the third material 21C overlap. This forms a second seam allowance 25B that includes the second edge E2 and the third edge E3.

[0030] Here, the first notch 30A and the second notch 30B are provided in the portions of the first seam allowance 25A and the third seam allowance 25C through which the second thread T2 passes. Therefore, the second thread T2 sews the narrow ends 30E of the first seam allowance 25A and the third seam allowance 25C to the base material 21Z and the third material 21C. At this time, the narrow ends 30E are folded and sewn either towards the first material 21A side or the second material 21B side (see Figures 12 and 13B). In this embodiment, the narrow ends 30E of the first seam allowance 25A and the narrow ends 30E of the third seam allowance 25C are folded to opposite sides (see Figure 13B). In other words, the second thread T2 sews the base material 21Z to the third material 21C in such a way that the first seam allowance 25A and the third seam allowance 25C do not overlap (so that the first seam allowance 25A, the second seam allowance 25B, and the third seam allowance 25C do not overlap, resulting in six layers of fabric).

[0031] Next, as shown in the change from Figure 12 to Figure 9, the base material 21Z and the third material 21C are spread apart on opposite sides, with their front surfaces facing outwards, using the seam (sewing line L) of the second seam allowance 25B as a fold (the parts other than the second seam allowance 25B are opened). In this way, sewing near the intersection P of the sewn product 10 is completed.

[0032] The sewn product 10 of this embodiment can achieve the same effects as the sewn product 10 of the first embodiment described above. In this embodiment, in addition to the first notch 30A of the first seam allowance 25A, a second notch 30B of the third seam allowance 25C is also provided. Therefore, even at the intersection P2 where the sewing line L intersects in a cross shape (the seam allowances 25 intersect in a cross shape) and distortion of the sewing line L is likely to occur, it is possible to suppress the occurrence of appearance defects such as distortion of the sewing line L due to the seam allowance 25 getting in the way. In particular, in conventional sewn products, the first seam allowance 25A, the second seam allowance 25B, and the third seam allowance 25C may overlap six times near the intersection P2, making that part look unsightly. In contrast, in this embodiment, it is possible to prevent the overlapping of six seam allowances, thereby improving the appearance of the sewn product 10.

[0033] [Third Embodiment] Figures 14A and 14B show a sewn product 10 of the third embodiment. In this embodiment, compared to the first embodiment, a recess 30F is provided in the first notch 30A formed within the first seam allowance 25A, extending closer to (deeper than) the first thread T1. The recess 30F is provided in the first notch 30A, for example, in the portion corresponding to the sewing position of the second thread T2. The recess 30F may be formed deep enough to reach the first thread T1. Therefore, in this embodiment, the width of the narrow end 30E of the first seam allowance 25A (the amount of protrusion into the inside of the sewn product 10) is smaller in the recess 30F. With this configuration, the second thread T2 can be sewn in an upright position without bending the narrow end 30E toward either the first base material 21A side or the second base material 21B side. In the configuration of this embodiment, the first seam allowance 25A becomes less of an obstruction at the intersection where the sewing lines L intersect, thus further suppressing the deterioration of the appearance of the sewing lines L near the intersection. In this embodiment as well, a second notch 30B may be formed in the third seam allowance 25C, and by making this second notch 30B as deep as the first notch 30A (for example, by forming a recess 30F), the width (protrusion amount) of the narrow end 30E of the third seam allowance 25C may be reduced. In this way, the deterioration of the appearance of the sewing lines L near the intersection can be further suppressed. The recess 30F may be formed before sewing the first base material 21A and the second base material 21B together, or it may be formed by sewing the second thread T2 (by the tension of the second thread T2).

[0034] [Fourth Embodiment] Figure 15 shows a sewn product 10 of the fourth embodiment. In this embodiment, the first boundary K1 between the first base material 21A and the second base material 21B is not aligned with the second boundary K2 between the fourth base material 21D and the fifth base material 21E (i.e., they are not on each other's extensions), and is offset, which is different from the second embodiment (see Figures 15 and 16). In this configuration, it is preferable that the first seam allowance 25A and the third seam allowance 25C, which are sewn to the base base material 21Z and the third base material 21C in a folded state, are arranged so as not to overlap each other (i.e., the first seam allowance 25A, the second seam allowance 25B, and the third seam allowance 25C do not overlap to form a six-layered structure) (see Figures 16B, 17A, and 17B). In this way, by arranging the first seam allowance 25A and the third seam allowance 25C so as not to overlap, it is possible to suppress the difficulty of sewing and the occurrence of defects in appearance and feel near the intersection of the sewing line L, as can occur when the seam allowances 25 overlap. Note that the first seam allowance 25A and the third seam allowance 25C may be folded so as to be away from each other (see Figure 16B), so as to be brought closer to each other (see Figure 17A), or so as to be folded to the same side (see Figure 17B), as long as they do not overlap each other.

[0035] [Other embodiments] In the above embodiment, the notches 30 (first notch 30A, second notch 30B) were rectangular in shape, but they may be of other shapes. The notches 30 may be triangular in shape with the corners of the seam allowance 25 cut diagonally, as shown in Figures 18 and 19, or they may be fan-shaped in shape with the corners of the seam allowance 25 cut out. For example, the first notch 30A and the second notch 30B may be the same shape and size.

[0036] As shown in Figures 20A and 20B, for example, in the first seam allowance 25A which is sewn to the base material 21Z and the third material 21C by the second thread T2 and has a first notch 30A, the portion included in the first material 21A and the portion included in the second material 21B may be arranged so that they are folded to opposite sides. In this configuration as well, the first notch 30A may be formed to form a triangular shape with the corner of the first seam allowance 25A cut out at an angle (see Figures 21A and 21B).

[0037] In the above embodiment, the notch 30 was provided on both of the two base materials 21 that overlap at the seam allowance 25 (for example, the first base material 21A and the second base material 21B), but the notch 30 may be provided on only one of these base materials 21.

[0038] In the above embodiment, the notches 30 (first notch 30A, second notch 30B) were formed before the base materials 21 (first base material 21A and second base material 21B, or fourth base material 21D and fifth base material 21E) were sewn together (e.g., when the base materials 21 were cut). However, it is also possible to form the notches 30 within the seam allowance after the base materials 21 that do not have notches 30 have been sewn together. Even in this way, it is possible to suppress the appearance of the part where the sewing lines L of the sewn product 10 intersect. However, in this method, the work is performed by an operator, so it is possible that additional work will be required, increasing the effort and reducing work efficiency. For this reason, it is preferable that the notches 30 are formed before the base materials 21 are sewn together (e.g., when the base materials 21 were cut). In this case, the notches 30 can be formed when the base materials 21 are cut using an automatic cutting machine, etc., and the decrease in work efficiency can be suppressed.

[0039] <Note> The following describes the features extracted from the above embodiment, explaining their effects and other aspects as needed.

[0040] For example, the following set of features of this disclosure, relating to "sewn products," can be considered to have been conceived in response to the problem that "sewn products may have portions where sewing lines that join sheet-like base materials together intersect in a T-shape, cross shape, etc. (see, for example, Japanese Patent Publication No. 7212498 (Figures 3, 5, etc.))" and the problem that "these portions of sewn products where sewing lines intersect can result in an unsightly appearance." Furthermore, there has been a long-standing demand for the development of novel sewn products, novel manufacturing methods for sewn products, and novel technologies related to sewn products.

[0041] [Feature 1] A sheet-like first base material and a second base material, each having a first edge and a second edge that intersects with the first edge, A sheet-like third base material having a third end edge, A first thread is used to sew the first base material and the second base material together along the first edge, such that the first edge is included in the first seam allowance. The first and second base materials are sewn to the third base material with a second thread, with the portions of the first and second base materials other than the first seam allowance open, such that the second and third edges are included in the second seam allowance. Within the first seam allowance, a first notch is formed through which the second thread passes, extending from the first edge toward the first thread and continuing to the second edge. A sewn product in which the portions of the first base material, the second base material, and the third base material, sewn together by the second thread, are open except for the second seam allowance.

[0042] [Feature 2] The sewn product according to feature 1, wherein the first notch is formed at the corner between the first edge and the second edge of the first and second base materials.

[0043] [Feature 3] The third substrate is, A sheet-like fourth base material and a fifth base material, each having a fourth edge and a fifth edge that intersects with the fourth edge, A third thread for sewing the fourth base material and the fifth base material together along the fourth edge such that the fourth edge is included in the third seam allowance, The third edge is composed of the fifth edge of the fourth and fifth base materials, with the portions other than the third seam allowance open. The sewn product according to feature 1 or 2, wherein within the third seam allowance, a second notch is formed, which is cut out from the fourth edge toward the third thread and extends to the fifth edge, for the portion through which the second thread passes.

[0044] [Feature 4] The sewn product according to feature 3, wherein the second thread sews the first base material and the second base material to the third base material so that the first seam allowance and the third seam allowance do not overlap.

[0045] [Feature 5] The sewn product according to feature 4, wherein the second thread aligns the first boundary between the first and second base materials sewn together by the first thread with the second boundary between the fourth and fifth base materials sewn together by the third thread, and sews the first and second base materials to the third base material.

[0046] [Feature 6] A sewn product according to any one of features 3 to 5, wherein the second notch is formed in which the corner between the fourth edge and the fifth edge of the fourth and fifth base materials is notched.

[0047] The above features make it possible to suppress the unsightly appearance at the points where the sewing lines of a sewn product intersect. Furthermore, the sewn products described in features 4 and 5 can also be constructed without notches.

[0048] While this specification and drawings disclose specific examples of the technology included in the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and changes to these examples, as well as parts of the examples taken individually. [Explanation of symbols]

[0049] 10 Sewn products 21 Base material 21A 1st base material 21B 2nd base material 21C 3rd base material 21D 4th base material 21E 5th base material 21Z base material 25 seam allowance 25A First seam allowance 25B Second seam allowance 25C Third seam allowance 30 Notch 30A First notch 30B Second notch 30E Narrow end 91 Headrest E1 First edge E2 Second edge E3 Third edge E4 Fourth edge K1 1st boundary K2 2nd boundary L Sewing Line P1 intersection P2 intersection T1 1st thread T2 Second thread T3 Third thread

Claims

1. A sheet-like first base material and a second base material, each having a first edge and a second edge that intersects the first edge, A sheet-like third base material having a third end edge, A first thread is used to sew the first base material and the second base material together along the first edge, such that the first edge is included in the first seam allowance. The first and second base materials are sewn to the third base material with a second thread, such that the second and third edges are included in the second seam allowance, with the portions of the first and second base materials other than the first seam allowance open. Within the first seam allowance, a first notch is formed through which the second thread passes, extending from the first edge toward the first thread and continuing to the second edge. A sewn product in which the portions of the first base material, the second base material, and the third base material, which are sewn together by the second thread, are open except for the second seam allowance.

2. The sewn product according to claim 1, wherein the first notch is formed at the corner between the first edge and the second edge of the first and second base materials.

3. The third substrate is, A sheet-like fourth base material and a fifth base material, each having a fourth edge and a fifth edge intersecting the fourth edge, The material includes a third thread for sewing the fourth base material and the fifth base material together along the fourth edge, such that the fourth edge is included in the third seam allowance, The third edge is composed of the fifth edge of the fourth and fifth base materials, with the portions other than the third seam allowance open. The sewn product according to claim 1 or 2, wherein within the third seam allowance, a second notch is formed, which is cut out from the fourth edge toward the third thread and extends to the fifth edge, for the portion through which the second thread passes.

4. The sewn product according to claim 3, wherein the second thread sews the first base material and the second base material to the third base material so that the first seam allowance and the third seam allowance do not overlap.

5. The sewn product according to claim 4, wherein the second thread sews the first and second base materials to the third base material while aligning the first boundary between the first and second base materials sewn together by the first thread and the second boundary between the fourth and fifth base materials sewn together by the third thread.

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