JPS61199893A - Curved surface stitching sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sewing machine for sewing curved surfaces suitable for sewing a portion to be formed into a single curved surface.

[Prior art and its problems]

Conventionally, sewing a portion to be formed into a curved shape has been an extremely difficult task. Examples of this curved surface sewing work include attaching a zipper to a skirt.

Normally, the zipper of a skirt is attached to the back or side, but since it needs to be attached to fit the curved shape of the skirt, the zipper of the skirt is cut as shown in Figure 4 or Figure 5. . In addition, FIG. 4 shows the cut state of the outer material a when the fastener is attached to the rear part of the skirt, and FIG. 5 shows the cut state when the fastener is attached to the side of the skirt.

By the way, in order to attach the zipper to the outer material a which has been cut with a so-called bias, as shown in FIG. The method used was to sew them together in the same way. FIG. 7 is a sectional view showing the sewing state of the outer material a and the fastener b by this method, and in FIG. 1, the chain arrow indicates the direction of the needle mb.

The outer material a and the zipper b sewn in this way are stable if they are flat without closing the zipper, but if the zipper b is closed and curved along the curve of the waist, the upper thread t1 and the lower thread Unreasonable force is applied to the outer material a and the fastener b through t2, resulting in an unstable state. As a result, as shown in Fig. 8, there was a problem in that the flap surface a1 of the skirt was wavy, resulting in a significant deterioration in quality.Especially when the zipper b was attached to the side of the skirt, or when attached to the rear. Since the bias at the cutting part is greater than that in the cutting section, more severe ripples will occur.

Therefore, workers tried to prevent the occurrence of waviness by sewing the pieces together little by little while taking into account the necessary curves, but this work was very time-consuming and required a great deal of skill.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a sewing machine for sewing curved surfaces, which can easily and efficiently sew parts to be formed into curved surfaces, such as a skirt with a zipper. do.

[Means for solving problems]

The present invention includes a cloth mounting table having a curved surface and a moving mechanism for moving the cloth mounting table in the direction of extension of the curved surface.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is the sewing machine body, la is the head of the sewing machine body 1, ■b is the bottom of the sewing machine body 1, lc is the bottom tb
The upper needle 1 is provided on the head 1a with a support that projects upward.
d has a needle hole 1e through which it is inserted. Reference numeral 2 denotes a pulse motor fixed on the bottom part lb, and its rotation is controlled by a drive control means not shown in FIG. 2a is this pulse motor 2
Gears 3a and 3b provided on the rotating shaft of the shaft 4 rotatably support the shaft 4 by a pair of bearings fixed on the bottom part lb. 5
is a support member that supports the pulse motor 6 and the like, and is inserted and fixed to the shaft 4. 7 is a gear inserted and fixed to the shaft 4, 8a
, 8b are two moving arms, each having gears 9a, 9b rotatably attached to the side surfaces 5a, 5b of the support member 5.
Attach one end to the Further, the gear 9a meshes with a gear 6a attached to the rotating shaft of the pulse motor 6. A is a curved fabric table on which the fabric to be sewn is placed.

It is fixed onto the two moving arms 8a and ab.

The curved state of this cloth mounting table A is made to match the curved shape of the cloth to be made of Wi, and in this embodiment, the curved state is made to match the curved shape of the side of the skirt as described above. In other words, in the short side direction (X direction), the radius R centered on axis 4
1, and has a radius R2 centered on the gear 9a in the long side direction (Y direction). Note that A1 is a notch formed in this cloth mounting table A. 1
0a and 10b are 2 that press down the cloth placed on the cloth mounting table A.
Each presser foot plate has a presser foot lever 11a.

11b and an air cylinder 12a connected thereto,
A moving mechanism B is constituted by 0 or more 2 to 12b attached to the support arms 8a and 8b via 12b.

Next, the operation of attaching a zipper to the skirt outer material a using the curved surface sewing machine having the above configuration will be explained.

First, zipper B attached to pre-swaged lining C
and the outer fabric a are placed properly along the curved surface of the cloth mounting table 1b'', and the presser plates 10a and 10b are lowered to fix the outer fabric a and the lining C. As a result, the fastener b and the outer fabric C are fixed.
A will draw a curve similar to the curve when wearing a skirt. The presser plates 10a and 10b can be raised and lowered by operating means not shown in Figure 1.
This is done by moving 2al, 12b+ back and forth and rotating the press elms t<-10a, 10b connected thereto.

After this, cloth mounting table A with outer material a and fastener b fixed
When sewing is performed by a well-known sewing mechanism while being moved in the X direction or Y direction by the moving mechanism B, that is, when sewing in the long side direction of the zipper b, the sewing operation is performed by a control means (not shown). The pulse motor 6 is driven to rotate the gear 9a, and the cloth mounting table A is moved in the Y direction together with the support arms 8a and 8b.
Sewing in the short side direction is performed by rotating the shaft 4 together with the gear 7 by the pulse motor 2 and moving the support member 5, the support arms 8a and 8b, and the cloth mounting table AIX direction.

In this way, the outer material a and the zipper b are curved along the curve of the waist as shown in FIG.

That is, the skirt is sewn while being worn, and in this state the outer material a and the zipper b are most stable.

In addition, in FIG. 2, the chain line arrow indicates the direction of the needle 1d. Therefore, unlike the above-mentioned conventional example, no excessive force is applied when wearing the product, and a product without undulations as shown in FIG. 3 can be obtained. be able to. In the above embodiment, a zipper is attached to the side of a skirt. However, the present invention is also applicable to other sewing methods as long as a portion to be formed into a curved surface is sewn. In this case, the curved surface of the cloth mounting table A and the direction of movement by the moving mechanism B may be changed as appropriate depending on the curved surface to be sewn.

Furthermore, it goes without saying that a well-known microcomputer or the like can be used to control the moving mechanism B to completely automate its operation.

〔effect〕

As explained above, the one-sided sewing machine of the present invention has the following features:
Equipped with a fabric mounting table having a curved surface and a moving mechanism that moves this mounting table in the direction of extension of the curved surface, it is easier for skilled workers to sew parts that should be formed into a curved surface, such as when attaching a zipper to a skirt. The effect is that it can be performed easily and satisfactorily even if it is not.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing the outer material and zipper sewn by the method shown in FIG. 1, and FIG. Figure 4 is a perspective view showing how the sewn skirt is worn, Figure 4 is a plan view showing how the outer material is cut when the zipper is attached to the back of the skirt, and Figure 5 is a diagram showing how the outer fabric is cut when the zipper is attached to the side of the skirt. A plan view showing the cutting state,
Fig. 6 is a perspective view showing conventional sewing work, Fig. 7 is a sectional view showing the zipper and outer material sewn together by conventional sewing work, and Fig. 8 is a completed skirt when worn by conventional sewing work. FIG.

Claims (1)

[Claims] 1. A sewing machine for sewing curved surfaces, comprising a cloth mounting table having a desired curved surface and on which a cloth to be sewn is placed, and a moving mechanism for moving the cloth mounting table in an extending direction of the curved surface.