JPH04138196A - Automatic sewing machine - Google Patents

Abstract

PURPOSE:To form a circular sewed part having a high circularity with uniform seams on a material to be sewed by nipping and supporting the material to be sewed between a rotating plate and a presser member, and rotating it together with the rotating plate by a feed member. CONSTITUTION:An automatic sewing machine 1 for circularly sewed material such as an air bag has a base 2 for placing a sewing machine body 5 and a working table 3 provided adjacent to the base. On the upper surface side of the working table, a rotating plate 11 formed smaller than the material to be sewed is disposed, a circular presser member 21 nipping the material to be sewed placed on the rotating plate and rotating it together with the rotating plate is provided above the rotating plate, and the rotating shaft 22 of the presser member is made vertically movable by a vertically lifting means 37. The material to be sewed or/and the rotating plate is rotated by a feed member 41 to form a circular sewed part on the material to be sewed. The feed member 41 has a puller 43, for example, rotated synchronously with the vertical movement of a sewing needle 8, a taper 45 for increasing the frictional resistance with the material to be sewed is formed on the outer circumference of the puller, and the puller is disposed on the sewing machine body side so that the lower end makes contact with the outer periphery of the working table.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic sewing machine, and more specifically, the present invention relates to an automatic sewing machine, and more specifically, the airbag body of an airbag device bulges out in the event of a collision with a vehicle or the like and hits a seated person. The present invention relates to an automatic sewing machine that sews the outer periphery of a cloth to be protected.

[Prior Art] Conventionally, the airbag body of an airbag device has been formed by sewing two circular pieces of fabric, upper and lower, with a sewing machine. The sewing machine was sewing the material to be sewn manually.

[Problem to be solved by the invention]

It is difficult to sew a circular workpiece with a high degree of circularity, and it tends to meander, making it impossible to sew with high precision. Also, it is difficult to sew uniformly at a constant speed, making the seams difficult to sew. The pitch of the seam fluctuates and stable sewing is not possible, and as a result, when a high load is applied to the airbag body, cracks occur in the uneven seams, causing the airbag body to fall off, etc. It had the following problems.

An object of the present invention is to be able to form a highly circular sewn part on a workpiece, to stabilize the sewing feed speed of the workpiece, and to have uniform strength of the circular sewn part.
An object of the present invention is to provide an automatic sewing machine that can significantly improve the strength of a workpiece.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and includes a base on which a sewing machine body is placed, and a workbench disposed adjacent to the base. A rotary plate smaller than the object to be sewn is disposed on the upper surface of the workbench, and above the rotary plate, the object to be sewn placed on the rotary plate is held between the rotating plate and rotated. A circular presser member is disposed, a rotating shaft of the presser member is movable up and down by a vertical elevating means, and the object to be sewn or the rotary plate is rotationally driven by a feed member to perform circular sewing on the object to be sewn. It is characterized by forming a part.

[Effect]

According to the present invention, the workpiece is held between the rotary plate and the presser member, the workpiece is rotated together with the rotary plate by the feed member, and the workpiece can have uniform stitches and roundness. It is possible to form a circular sewing part with a high degree of height.

[Example] The automatic sewing machine according to the present invention will be described in detail below with reference to the drawings.

1 to 6 schematically show an embodiment of the present invention, and this automatic sewing machine 1 includes a base 2 on which a sewing machine main body 5 is placed, and a base 2 adjacent to the base 2. It has a workbench 3 arranged in a manner similar to that shown in FIG. The base 2 and the workbench 3 are formed to have substantially the same upper surface height, and although they are formed separately in this embodiment, the base 2 and the workbench 3 may be formed integrally.

In addition, the base 2 is formed large, and the workbench 3 is placed on this base 2.
may also be placed.

A conventionally known sewing machine needle attachment part 7 that moves up and down with a predetermined stroke is formed in the head 6 of the sewing machine body 5, and a sewing machine needle 8 is fixed to this attachment part 7.

It should be noted that the drive mechanism of the automatic sewing machine 1, the sewing thread supply device, the needle receiver provided on the base 2, and other structures that are conventionally known can be used, and a detailed explanation thereof will be omitted.

A flat recess 9 is formed approximately at the center of the workbench 3;
A rotary plate 11 is placed in this recess 9. Rotating plate 11
A rotating shaft 12 extends downward from a through hole 13 formed in the center of the recess 9, and is rotatably supported on a floor or the like. Note that the shapes of the rotary plate 11 and the workbench 3 are not limited to those shown in the drawings, and the rotary plate 11 may be arranged rotatably at the bottom of the recess 9 of the workbench 3 using a bearing or the like. The stand 3 may be formed independently along the outer periphery of the rotating plate 11.

The rotating shaft 12 of the rotating plate 11 may be driven by a motor, and in this case, it is driven intermittently in synchronization with the vertical movement of the sewing machine needle 8. Furthermore, a flat circular protrusion 15 for central positioning is formed at the center of the upper surface of the rotary plate 11, and this feature is applied to airbag bodies etc. in which a through hole 18 is formed at the center of the sewing object 17. By aligning the through hole 18 with the protrusion 15, central positioning can be performed.

A circular presser member 21 is disposed above the rotary plate 11 and rotates while holding a sewing object 17 made of two or more pieces of fabric placed on the rotary plate 11 together with the rotary plate 11. . This holding member 21 has a rotating shaft 22 extending upward from the central portion.
It is formed from a support rod portion 23 that extends radially outward around the rotating shaft 22, and a circular frame-shaped presser portion 24 that is integrally formed at the outer end of the support rod portion 23.

A support 3 is installed on the base 2 or the floor behind the sewing machine main body 5.
1 is formed, and an arm 33 is attached to the support column 31 so as to be rotatable back and forth. At the tip of the arm 33 is a mounting board 3.
5 is attached to the mounting board 35, and a vertical elevating means 37 consisting of an air cylinder or the like is attached to this mounting board 35. The rotating shaft 22 of the presser member 21 is connected to the movable member 38 of the vertically raising/lowering means 37.

Therefore, when the object to be sewn 17 is not sewn, the presser member 21 can be pulled upward and the arm 33 can be rotated backward to be in a standby state, and when the object to be sewn 17 is sewn, the presser member 21 is moved above the rotary plate 11 by the rotation of the arm 33, and the vertical elevating means 37 is operated to lower the movable member 3, so that the sewing object 17 can be held between the presser member 21 and the rotary plate 11. It is done like this. Incidentally, after forming the sewing portion on the object 17 to be sewn, the operation is performed in the opposite manner to that described above.

As shown in FIG. 5, the workpiece I7 is placed on the rotary plate 1 at a position behind the position where the sewing machine needle 8 of the sewing machine main body 5 moves up and down.
1 and the holding member 21 are provided. This feed member 41 is equipped with a puller 43 that rotates in synchronization with the vertical movement of the sewing machine needle 8 of the sewing machine main body 5, and has a puller 43 on the outer periphery of the puller 43 that increases the frictional resistance with the material to be sewn 17. A taper 45 is formed to apply appropriate tension. Sewing machine body 5 is moved so that the lower end of puller 43 comes into contact with the outer peripheral edge of workbench 3.
attached to the side.

Therefore, the object to be sewn 17 is formed larger than the rotary plate 11.
is placed on the rotary plate 11, the outer peripheral edge of the workpiece 17 is placed on the workbench 3, and the puller 43 rotates and presses the outer peripheral edge of the workpiece 17 on the workbench 3. According to
A tensile force is applied to the sewing object 17 in the rotational direction, and the rotating plate 11 and the presser member 21 are intermittently rotated by this tensile force.

Further, a front puller 47 is attached to a position in front of the sewing machine needle 8, and this front puller 47 is attached to a mounting bracket 48 attached to the outer peripheral edge of the front side of the workbench 3. is formed facing toward the rotation center of the rotary plate 11.

Further, a spiral protrusion 51 is formed on the outer circumferential surface of the front puller 47 to apply an appropriate outward tension to the object to be sewn 17, thereby improving sewing accuracy.

In addition, in the embodiment described above, the puller of the feeding member 41
Although the puller 43 is brought into contact with the outer peripheral edge of the workpiece 17, as shown in FIG.
A lower puller may also be provided on the lower surface side of the rotary plate 11 in correspondence with the rotary plate 11. Further, a plurality of the above-mentioned pullers 43 may be provided and used for both the puller 43 that applies tension to the workpiece 17 and the puller 43 that rotationally drives the presser member 21.

According to such a configuration, a circular sewing part can be formed without generating wrinkles in the sewing material Th17 due to tensile force.

A position detection piece 53 is provided on the upper surface of the circular frame-shaped presser portion 24 of the presser member 21, and a detection means 55 for detecting the position detection piece 53 is provided on one side of the sewing machine main body 5. The detection means 55 can be formed using an optical sensor or the like.

Therefore, when the object to be sewn 17 is held between the rotary plate 11, the workbench 3, and the presser member 21 and rotates once to form a circular sewing part, the detection means 55 detects the position detection piece 53.
is detected, the vertical movement of the sewing machine needle 8 of the sewing machine main body 5 can be stopped, and the rotation of the puller 43 of the feeding member 41 can be stopped. Further, by appropriately setting the wrap length between the starting point and the end point of the circular sewing part, it is possible to form a circular sewing part with a constant wrap length.

[Effects of the Invention] The above is the configuration of an embodiment of the automatic sewing machine according to the present invention. According to this configuration, the work to be sewn is held between the rotating plate and the presser member, The object is rotated by the feed member together with the rotary plate, and a circular sewing part with uniform stitches and high roundness can be formed on the object to be sewn, and the strength of the circular sewing area is uniform and the strength of the object is increased. It is possible to obtain an automatic sewing machine that can be significantly improved.

[Brief explanation of drawings]

1 to 6 schematically show an embodiment of an automatic sewing machine according to the present invention, in which FIG. 1 is an overall perspective view, FIGS. 2 and 3 are perspective views of a presser member, and FIGS. Fig. 4 is a side sectional view, Fig. 5 is a perspective view of the feeding member, Fig. 6 is a perspective view of the workpiece placed on the workbench, and Fig. 7 is a perspective view showing a modified example of the puller. be. In the figure, 1... automatic sewing machine, 2... base, 3...
・Workbench, 5... Sewing machine body, 8... Sewing machine needle, 1
DESCRIPTION OF SYMBOLS 1... Rotating plate, 17... Sewing object, 21... Pressing member, 31... Support column, 33... Arm, 37...
Vertical lifting means, 41... Feeding member, 43... Puller 47... Front puller 3... Position detection piece, 55... Detection means. Figure 3 Figure 4 Figure 5 Figure 1! Figure 7

Claims (1)

[Claims] (1) It has a base on which the main body of the sewing machine is placed, and a workbench arranged adjacent to the base, and a rotary plate formed smaller than the object to be sewn is provided on the upper surface side of the workbench. A circular pressing member is disposed above the rotating plate and rotates while holding the workpiece placed on the rotating plate together with the rotating plate, and the rotating shaft of the holding member moves up and down. 1. An automatic sewing machine, characterized in that the sewing machine is made vertically movable by means of means, and the workpiece or rotary plate is rotationally driven by a feeding member to form a circular sewing part on the workpiece.