JP6171962B2 - General feed sewing machine - Google Patents

Description

  The present invention provides an overall feed comprising an L-shaped presser member that holds the sewing product on the bottom surface, and an L-shaped upper feed member that feeds the sewing product in the feed direction while pressing the sewing product in a state where the sewing needle is stuck on the bottom surface. Regarding sewing machines.

  In the total feed sewing machine, the upper feed member that presses the upper surface of the sewing product can move in the vertical direction and can swing in a predetermined direction, and the sewing needle can also move in the vertical direction and swing in the predetermined direction. Further, the lower feed dog that contacts the lower surface of the sewn product is slidable in a predetermined direction. For this reason, in the total feed sewing machine, the sewing product is fed in a predetermined direction by the upper feed member, the sewing needle, and the lower feed dog, so that even if it is a thick sewing product, the sewing product can be fed properly. It is possible. The following patent document describes an example of such a comprehensive feed sewing machine.

JP 2007-282747 A

  According to the comprehensive feed sewing machine described in the above-mentioned patent document, it becomes possible to appropriately feed a thick sewing product. However, when a thin sewing product is sewn by the comprehensive feed sewing machine described in the above-mentioned patent document, there is a possibility that the shrinkage of the sewing occurs. This is because when the upper thread is pulled upward and the upper thread and the lower thread are bundled, the sewing product is pressed by the presser member, but the presser member of the general feed sewing machine described in the above-mentioned patent document is bifurcated. When the sewn product is pressed by the presser member, the binding portion of the upper thread and the lower thread is located between the fork of the presser member. For this reason, the sewn product is pressed by the presser member at a position away from the binding portion between the upper thread and the lower thread, and when the sewn product is thin, the sewn product is pulled upward together with the upper thread, It becomes a tent shape. As described above, when the sewing needle is stabbed into the tent-shaped sewing product and the sewing is performed, the shrinkage occurs in the sewing product. That is, the comprehensive feed sewing machine described in the above-mentioned patent document is suitable for sewing a thick sewing product, but is not suitable for sewing a thin sewing product. The present invention has been made in view of such circumstances, and an object of the present invention is to provide an integrated feed sewing machine that is suitable for sewing not only thick sewing products but also thin sewing products.

In order to solve the above-mentioned problem, the total feed sewing machine according to claim 1 of the present application moves in the vertical direction and moves in the vertical direction, the L-shaped presser member that presses the sewing product, and moves in the vertical direction. A general feed sewing machine comprising an L-shaped upper feed member that feeds in the feed direction while holding the sewing product in a state of being stabbed with a sewing needle in the bottom direction. A through-hole penetrating in the vertical direction is formed on the bottom of the upper feed member that holds the sewing product,
The bottom of the pressing member, a hole penetrating vertically is formed, the bottom for pressing the workpiece of the pressing member, with the movement of the at least one of the vertical direction between the upper feed member and the pressing member, The upper thread located in the through-portion of the upper feed member and the presser member being clamped to the lower thread presses the sewing product on the bottom surface when the upper thread is pulled upward through the hole. And

  Further, in the total feed sewing machine according to claim 2, in the total feed sewing machine according to claim 1, the bottom portion of the upper feed member has a bifurcated shape, and a portion between the fork of the bottom portion of the upper feed member is It functions as the penetrating part.

In the comprehensive feed sewing machine according to claim 1, a through portion penetrating in the vertical direction is formed in the bottom portion for pressing the sewing product of the upper feed member. And the bottom part which presses the sewing material of a pressing member is accommodated in the penetration part of an upper feeding member with a movement to the up-down direction of at least one of a pressing member and an upper feeding member. That is, the bottom portion of the presser member that presses the sewing product is accommodated in the penetrating portion of the upper feed member, so that it is relatively compact. For this reason, the sewing product can be pressed by the bottom portion of the pressing member at a location close to the binding portion of the upper thread and the lower thread. As a result, when the upper thread is pulled upward, even if the sewing product is thin, it is possible to appropriately prevent the sewing product from moving upward together with the upper thread. It becomes possible to prevent appropriately. That is, with the comprehensive feed sewing machine according to the first aspect, not only a thick sewing product but also a thin sewing product can be appropriately sewn. In the integrated feed sewing machine according to claim 1, when a hole penetrating in the vertical direction is formed in the bottom portion of the presser member, and the upper thread that has been clamped by the lower thread is pulled upward through the hole Further, the sewing product is pressed on the bottom surface of the presser member. As a result, the sewing product can be pressed by the bottom portion of the presser member at a position close to the binding portion between the upper thread and the lower thread, and the occurrence of sewing shrinkage can be prevented.

  In the integrated feed sewing machine according to claim 2, the bottom portion of the upper feed member has a bifurcated shape, and the bottom portion of the presser member is accommodated in a portion between the bifurcated portions. Thereby, it becomes possible to accommodate the bottom part of the pressing member in the bottom part of the top feed member having a simple shape.

It is a perspective view which shows the comprehensive feed sewing machine of an Example. It is a perspective view which shows the presser foot with which the comprehensive feed sewing machine of FIG. It is a perspective view which shows the upper feed leg with which the comprehensive feed sewing machine of FIG. It is a perspective view which shows the needle plate with which the comprehensive feed sewing machine of FIG. It is a perspective view which shows the lower feed dog with which the comprehensive feed sewing machine of FIG. 1 is provided. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a figure which shows the operating state of the comprehensive feed sewing machine at the time of sewing. It is a perspective view which shows the comprehensive feed sewing machine of the Example at the time of binding of an upper thread and a lower thread. It is a perspective view which shows the conventional comprehensive feed sewing machine at the time of binding of an upper thread and a lower thread. FIG. 14 is a perspective view showing a conventional total feed sewing machine at the time of binding an upper thread and a lower thread from an angle different from that of FIG. 13.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as modes for carrying out the present invention.

<Configuration of general feed sewing machine 10>
FIG. 1 shows an integrated feed sewing machine 10 according to an embodiment of the present invention. The general feed sewing machine 10 stabs the sewing needle 22 into the sewn product pressed by the presser foot 20, and feeds the sewn product with the sewing needle 22 stabbed in a predetermined direction by the upper feed foot 24 and the lower feed dog 26. The sewing machine has a structure, and can sew not only a thick sewing product but also a thin sewing product appropriately. The general feed sewing machine 10 is characterized by the shape of the presser foot 20, the upper feed foot 24, etc., and the mechanism for moving the presser foot 20, the upper feed foot 24, etc. is the same as that of the conventional general feed sewing machine. Therefore, an enlarged view of the presser foot 20, the upper feed leg 24, etc. is shown, and a diagram of a mechanism for moving the presser foot 20, the upper feed leg 24, etc. is omitted. The structure of the presser foot 20, the upper feed leg 24, etc. will be described in detail, and the structure of the mechanism for moving the presser foot 20, the upper feed leg 24, etc. will be omitted or simplified. .

  As shown in FIG. 1, the total feed sewing machine 10 includes a presser foot 20, a sewing needle 22, an upper feed foot 24, a lower feed dog 26, and a needle plate 28. The presser foot 20 is fixed to the lower end of the first shaft 30, and the first shaft 30 is held by a sewing machine arm 32 so as to be movable in the vertical direction. And the 1st axis | shaft 30 moves to an up-down direction with a pressing mechanism (illustration omitted). As a result, the presser foot 20 moves in the vertical direction.

  The presser foot 20 is generally L-shaped and includes a shaft portion 34 and a bottom portion 36. The presser foot 20 is fixed to the first shaft 30 at the shaft portion 34 so that the bottom portion 36 extends in the front-rear direction of the general feed sewing machine 10 (the direction of the arrow shown in FIG. 1). As shown, a long hole 38 is formed so as to extend in the front-rear direction of the general feed sewing machine 10.

  Further, the upper feed leg 24 is fixed to the lower end of the second shaft 50 as shown in FIG. The second shaft 50 is disposed next to the first shaft 30 and is located above a portion between the shaft portion 34 and the bottom portion 36 of the presser foot 20 fixed to the lower end of the first shaft 30. Yes. Further, the second shaft 50 is held by the sewing machine arm 32 so as to be movable in the vertical direction and swingable in the front-rear direction of the general feed sewing machine 10. The second shaft 50 moves in the vertical direction and swings in the front-rear direction of the general feed sewing machine 10 by an upper feed mechanism (not shown). As a result, the upper feed leg 24 moves in the vertical direction and swings in the front-rear direction of the general feed sewing machine 10.

  The upper feed leg 24 is generally L-shaped and includes a shaft portion 52 and a bottom portion 54. The upper feed leg 24 is fixed to the second shaft 50 at the shaft portion 52 so that the bottom portion 54 extends in the same direction as the bottom portion 36 of the presser foot 20. Further, as shown in FIG. 3, the upper feed leg 24 has a bifurcated shape from the middle of the shaft portion 52 to the tip of the bottom portion 54, and a portion between the bifurcated portions penetrates in the vertical direction. It functions as the penetration part 56. Note that the width of the penetrating portion 56, that is, the distance between the two legs of the upper feed foot 24 is slightly wider than the width of the bottom portion 36 of the presser foot 20. For this reason, when the upper feed leg 24 is lowered or the presser foot 20 is raised, the bottom portion 36 of the presser foot 20 enters between the two legs of the upper feed leg 24.

  The sewing needle 22 is fixed to the lower end of the third shaft 60 as shown in FIG. The third shaft 60 is disposed next to the second shaft 50, and is formed on the through portion 56 of the bottom 54 of the upper feed leg 24 fixed to the lower end of the second shaft 50 and the lower end of the first shaft 30. It is located above the elongated hole 38 of the fixed presser foot 20. Further, the third shaft 60 is held by the sewing machine arm 32 so as to be movable in the vertical direction and swingable in the front-rear direction of the general feed sewing machine 10. The third shaft 60 is moved in the vertical direction by the needle up-and-down moving mechanism (not shown) and the needle swinging mechanism (not shown) and swings in the front-rear direction of the general feed sewing machine 10. As a result, the sewing needle 22 moves in the vertical direction and swings in the front-rear direction of the total feed sewing machine 10.

  Further, the needle plate 28 is fixed to the sewing machine table 62 so as to face the bottom portion 36 of the presser foot 20 and the bottom portion 54 of the upper feed foot 24. As shown in FIG. 4, the needle plate 28 has a generally rectangular shape, and the needle plate 28 is formed with a U-shaped through hole 66 so as to extend in the longitudinal direction. As shown in FIG. 1, the needle plate 28 is fixed to the sewing machine table 62 so as to extend in the front-rear direction of the total feed sewing machine 10, and the through hole 66 is directly below the bottom 54 of the upper feed leg 24. Is formed.

  Further, as shown in FIG. 4, the needle plate 28 is formed with a long hole 70 in a protruding portion 68 protruding between the U-shaped through holes 66. The elongated hole 70 is formed directly below the elongated hole 38 of the presser foot 20 and has the same shape as the elongated hole 38. For this reason, when the presser foot 20 descends and comes into contact with the needle plate 28, the elongated hole 38 of the presser foot 20 and the elongated hole 70 of the needle plate 28 coincide with each other, and the vertical direction passes through the two elongated holes 38, 70. To penetrate. A hook (see FIG. 7) 72 for guiding the lower thread is disposed below the needle plate.

  Further, as shown in FIG. 5, the lower feed dog 26 includes a proximal end portion 76 and a tooth forming portion 78. The tooth forming portion 78 has a U-shape that is substantially the same shape as the through hole 66 of the needle plate 28, and is fitted into the through hole 66 as shown in FIG. 1. However, although the dimension in the width direction of the tooth forming part 78 is substantially the same as the dimension in the width direction of the through hole 66, the dimension in the longitudinal direction of the tooth forming part 78 is shorter than the dimension in the longitudinal direction of the through hole 66. Therefore, the tooth forming portion 78 fitted in the through hole 66 can slide in the longitudinal direction of the needle plate 28, that is, in the front-rear direction of the total feed sewing machine 10 in the through hole 66.

  As described above, the through hole 66 into which the tooth forming portion 78 is fitted is located directly below the bottom portion 54 of the upper feed leg 24, and the width of the tooth forming portion 78 is the bottom portion 54 of the upper feed foot 24. The width is substantially the same. Furthermore, the width of the portion between the two forks of the U-shaped tooth forming portion 78 and the width of the portion between the two forks of the bottom 54 of the upper feed leg 24 are substantially the same. For this reason, when the upper feed leg 24 is lowered, the bottom portion 54 of the upper feed leg 24 comes into contact with the tooth forming portion 78 fitted in the through hole 66, and the bifurcated portion of the tooth forming portion 78 and the upper feed foot 24. And the forked portion of the bottom 54 of the same. A plurality of teeth are formed on the upper surface of the tooth forming portion 78.

  Further, as shown in FIG. 5, the base end portion 76 is fixed to the lower surface of the tooth forming portion 78 and extends downward. Further, a bracket 80 is formed at the base end portion 76, and the bracket 80 is connected to a lower feed mechanism (not shown). The lower feed mechanism is a mechanism that slides the base end portion 76 in the front-rear direction of the total feed sewing machine 10, whereby the tooth forming portion 78 slides in the front-rear direction of the total feed sewing machine 10 in the through hole 66.

<Operation of general feed sewing machine 10>
The operation at the time of sewing of the general feed sewing machine 10 having the above configuration will be described in detail below. First, as shown in FIG. 6, the sewing product is placed on the sewing machine table 62 of the total feed sewing machine 10, and the sewing product is pressed by the bottom portion 36 of the presser foot 20 and the bottom portion 54 of the upper feed foot 24. Yes. At this time, the bottom portion 36 of the presser foot 20 is positioned between the two forks of the bottom portion 54 of the upper feed foot 24. Further, the elongated hole 38 of the presser foot 20 and the elongated hole 70 of the needle plate 28 coincide with each other, and the forked portion of the bottom portion 54 of the upper feed foot 24 and the forked portion of the tooth forming portion 78 of the lower feed dog 26 are equal. I'm doing it.

  Then, the tip of the sewing needle 22 through which the upper thread is inserted descends to below the needle plate 28 as shown in FIG. At this time, the sewing needle 22 passes through the long hole 38 of the presser foot 20 and the long hole 70 of the needle plate 28. Further, the presser foot 20 is raised, and the presser foot of the sewing product by the presser foot 20 is released. That is, in a state where the sewing needle 22 is stuck in the sewing product, the sewing product is pressed only by the upper feed leg 24.

  Next, the sewing needle 22 lowered to the lower side of the needle plate 28 is raised as shown in FIG. 8, but when the sewing needle 22 is raised, the upper thread inserted through the sewing needle 22 becomes a loop shape. The upper thread is supplemented by a sword tip (not shown) provided in the shuttle 72. Then, the bobbin (not shown) of the bobbin (not shown) accommodated in the hook 72 is entangled with the loop upper thread, thereby forming a seam. At this time, the upper feed leg 24 pressing the sewing product swings in the direction of the arrow 88 shown in the drawing, and the lower feed dog 26 also slides in the direction of the arrow 88. Further, the sewing needle 22 in the state of being stabbed in the sewing product also swings in the direction of the arrow 88. As a result, the sewing product is fed in the direction of the arrow 88 by the upper feed leg 24, the lower feed dog 26 and the sewing needle 22. As described above, in the total feed sewing machine 10, the sewing product is sent out by the upper feed leg 24, the lower feed dog 26, and the sewing needle 22, so that even a thick sewing product can be appropriately fed. .

  Subsequently, the sewing needle 22 is further raised. At this time, the presser foot 20 is lowered as shown in FIG. Then, the sewing product is pressed by the lowered presser foot 20 as shown in FIG. On the other hand, the upper feed leg 24 rises and returns to the position before the swing. Thereby, the sewing product is pressed only by the presser foot 20. At this time, the sewing needle 22 is raised, the upper thread is pulled upward, and is tightened with the lower thread. When the upper thread and the lower thread are tightened, the sewing product is also pulled upward, but the sewing product is pressed by the presser foot 20. Then, as shown in FIG. 11, the upper feed leg 24 is lowered and the sewing product is pressed together with the presser foot 20, thereby completing the formation of one seam. By repeating the operations of the presser foot 20 and the upper feed foot 24 shown in FIGS. 6 to 11 described above, sewing by the total feed sewing machine 10 is performed.

<Characteristics of general feed sewing machine 10>
In the overall feed sewing machine 10, as described above, when the sewing needle 22 is raised and the upper thread and the lower thread are tightened, the sewing product is pulled upward but is pressed by the presser foot 20. Specifically, as shown in FIG. 12, when the upper feed leg 24 and the sewing needle 22 are raised, only the presser foot 20 is lowered, and the sewing product is moved by the bottom portion 36 of the presser foot 20. It is being pressed. At this time, the upper thread that rises together with the sewing needle 22 is bound to the lower thread through a long hole 38 formed in the bottom 36 of the presser foot 20. For this reason, at the time of binding the upper thread and the lower thread, the sewing product is pulled together with the upper thread, but is pressed by the bottom portion 36 of the presser foot 20.

  The width of the long hole 38 formed in the bottom portion 36 of the presser foot 20 is relatively narrow, and the upper thread is bound to the lower thread through the end of the long hole 38. For this reason, the sewing product is pressed by the bottom portion 36 of the presser foot 20 at a location close to the binding portion between the upper thread and the lower thread. As a result, the sewn product is ensured to be appropriately sewn with almost no upward movement. On the other hand, in the conventional general feed sewing machine, when the sewing needle rises and the upper thread is pulled upward, the sewing product also moves upward together with the upper thread, and sewing shrinkage occurs. In particular, when the sewn product is thin, the sewn product moves greatly upward, and large sewing shrinkage occurs.

  Specifically, the conventional general feed sewing machine 100 includes a presser foot 102, an upper feed foot 104, and a sewing needle 106 as shown in FIG. The presser foot 102 moves in the vertical direction in the same manner as the presser foot 20 of the general feed sewing machine 10. The bottom portion 108 of the presser foot 102 has a bifurcated shape that is substantially the same shape as the bottom portion 54 of the upper feed foot 24 of the general feed sewing machine 10. Further, the upper feed leg 104 moves in the vertical direction and swings in the front-rear direction of the total feed sewing machine 100, similarly to the upper feed leg 24 of the total feed sewing machine 10. The bottom part 110 of the upper feed leg 104 has substantially the same shape as the bottom part 36 of the presser foot 20 of the general feed sewing machine 10. However, a circular hole 112 is formed in the bottom 110 of the upper feed leg 104 instead of a long hole. Further, the sewing needle 106 moves in the vertical direction and swings in the front-rear direction of the total feed sewing machine 100, similarly to the sewing needle 22 of the total feed sewing machine 10. Further, the total feed sewing machine 100 also includes a lower feed dog (not shown) and a needle plate (not shown) that function in the same manner as the lower feed dog 26 and the needle plate 28 of the total feed sewing machine 10.

  The overall feed sewing machine 100 configured as described above operates in the same manner as the overall feed sewing machine 10, and the sewing product is fed out by the upper feed leg 104, the sewing needle 106, and the lower feed dog. It is possible to perform a simple delivery. However, as shown in FIG. 14, when the sewing needle 106 is raised and the upper thread and the lower thread are bound, the sewing product is pressed by the bottom 108 of the presser foot 102. At this time, the binding portion of the upper thread and the lower thread is located between the two forks of the bottom portion 108 of the presser foot 102. The width between the two forks of the bottom portion 108 is relatively wide, and the sewing product cannot be pressed by the bottom portion 108 of the presser foot 102 at a position close to the binding portion of the upper thread and the lower thread. For this reason, the sewn product moves upward together with the upper thread and becomes a shape in which the tent is stretched, and the sewn shrinkage occurs in the sewn product. In particular, in a thin sewing product, the amount of the sewing product that moves upward increases, and a large shrinkage occurs.

  On the other hand, in the total feed sewing machine 10, when the upper thread is raised, the sewing product is held by the bottom part 36 of the presser foot 20 having the shape shown in FIG. 12, and the bottom part 36 is a binding part of the upper thread and the lower thread. The sewing product is pressed at a position very close to the sewing machine. For this reason, for example, even when the sewing product is thin, as shown in FIG. 12, when the upper thread is pulled upward, the sewing product hardly moves upward and does not have a tent shape. As a result, the overall feed sewing machine 10 can perform appropriate sewing without causing sewing shrinkage even if the sewing product is thin. That is, the total feed sewing machine 10 can appropriately sew not only a thick sewing product but also a thin sewing product.

  Thus, the total feed sewing machine 10 capable of appropriately sewing not only a thick sewing product but also a thin sewing product is suitable for sewing a sewing product in which a thick portion and a thin portion are mixed. Specifically, for example, in the seat cover of an automobile seat, a place where a normal cloth is sewn, that is, a place where a relatively thin sewn place and a genuine leather, a seat pad, etc. are sewn, that is, a place where Thick sewing points are mixed. For this reason, at the time of conventional seat cover sewing, an overall feed sewing machine is used for a relatively thick sewing location, and a vertical feed sewing machine or the like is used for a relatively thin sewing location. However, if the sewing machine is changed according to the sewing location, the workability is very poor. In addition, if a relatively thick sewing location and a relatively thin sewing location are sewn using the conventional total feed sewing machine 100, as described above, sewing shrinkage occurs at the thin sewing location. On the other hand, with the integrated feed sewing machine 10, it is possible to appropriately sew both thick and thin sewing locations. Therefore, the total feed sewing machine 10 is suitable for sewing a sewing product such as a seat cover in which a thick portion and a thin portion are mixed.

  Incidentally, in the above embodiment, the total feed sewing machine 10 is an example of the total feed sewing machine. The presser foot 20 is an example of a presser member. The sewing needle 22 is an example of a sewing needle. The upper feed leg 24 is an example of an upper feed member. The bottom portion 36 of the presser foot 20 is an example of a bottom portion of the presser member. The long hole 38 is an example of a long hole. The bottom 54 of the upper feed leg 24 is an example of the bottom of the upper feed member. The penetration part 56 is an example of a penetration part.

  In addition, this invention is not limited to the said Example, It can implement in the various aspect which gave various change and improvement based on the knowledge of those skilled in the art. Specifically, for example, in the above-described embodiment, the bottom portion 54 of the upper feed leg 24 has a bifurcated shape, but may be any shape that can accommodate the bottom portion 36 of the presser foot 20, and for example, penetrates vertically. It may be a through hole. Moreover, although the long hole 38 is formed in the bottom part 36 of the presser foot 20, what is necessary is just the shape which can penetrate the sewing needle 22, for example, may be a forked shape.

In the above embodiment, it is described that the total feed sewing machine 10 is suitable for sewing a vehicle seat cover. However, the total feed sewing machine 10 can be used for sewing various sewing products. .

10: General feed sewing machine 20: Presser foot (presser member)
22: Sewing needle 24: Upper feed leg (upper feed member)
36: Bottom portion 38: Slotted hole 54: Bottom portion 56: Through portion

Claims (2)

An L-shaped presser member that moves in the vertical direction and holds the sewing product on the bottom surface;
An overall feed sewing machine comprising: an L-shaped upper feed member that moves in the vertical direction, swings in the feed direction of the sewing product, and holds the sewing product in a state where the sewing needle is stuck on the bottom surface while feeding the sewing product in the feed direction. Because
The upper feed member is
A through-hole penetrating in the vertical direction is formed on the bottom portion for pressing the sewing product of the upper feed member,
A hole penetrating in the vertical direction is formed in the bottom of the pressing member,
The bottom part for pressing the sewn product of the presser member,
Along with the movement in the vertical direction of at least one of the presser member and the upper feed member, it is located in the penetrating portion of the upper feed member ,
The pressing member is
An integrated feed sewing machine characterized in that when an upper thread in a state of being tightened to a lower thread is pulled upward through the hole, the sewing product is pressed on the bottom surface . The bottom of the upper feed member has a bifurcated shape,
The overall feed sewing machine according to claim 1, wherein a portion between the fork of the bottom portion of the upper feed member functions as the penetrating portion.

Images