JPH0413000B2 - - Google Patents

Description

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

[Prior art and its problems]

Conventionally, sewing a portion to be formed into a semi-ellipsoidal curved surface has been an extremely difficult task. Examples of this curved surface sewing work include attaching a zipper to a skirt. Normally, the fasteners of a skirt are attached to the rear or sides, but since they must be attached to fit the curved shape of the skirt, the outer material a of the skirt is cut as shown in FIG. 4 or 5. In addition, Figure 4 shows the outer material a when attaching a fastener to the rear of the skirt.
Fig. 5 shows the cutting state when it is attached to the side of the skirt.

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

Outer material a and fastener b sewn in this way are stable if they are flat without closing the fastener, but if fastener b is closed and curved along the curve of the waist, the upper thread t ₁ and the lower thread Unreasonable force is applied to the outer material a and the fastener b through the thread _t2 , resulting in an unstable state. As a result, as shown in Figure 8, undulations occur on the flap surface _a1 of the skirt.
There was a problem that the quality deteriorated significantly. In particular, when the fastener b is attached to the side of the skirt, the bias at the cut portion is greater than when it is attached to the rear, resulting in more severe ripples.

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 provides a sewing machine for sewing curved surfaces, which can easily and efficiently sew parts to be formed into semi-ellipsoidal curved surfaces, such as when attaching zippers to skirts. For the purpose of providing.

[Means for solving problems]

The present invention provides a cloth mounting table which has an opening for passing a needle corresponding to a sewing pattern and has a semi-circular spherical surface which is curved at different curvatures in the XY coordinate axes directions and substantially coincides with the curved surface of the cloth after sewing, and which is disposed above the sewing machine bed. a first drive mechanism that moves the cloth mounting table in the X coordinate direction along the curvature; and a second drive mechanism that is supported by the first drive mechanism and moves the cloth mounting table in the Y coordinate axis direction along the curvature. It is equipped with the following.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
This will be explained based on the diagram.

In the figure, 1 is the main body of a so-called post-type sewing machine, 1a is the head of this sewing machine main body 1,
1b is the bottom of the sewing machine body 1, and 1c is the bottom 1b.
It is a pillar-shaped bed projecting upward, and has a needle hole 1e into which an upper needle 1d provided on the head 1a is inserted. 2 is a pulse motor fixed on the bottom portion 1b, and its rotation is controlled by a drive control means (not shown). 2a is a gear provided on the rotating shaft of this pulse motor 2, and 3a and 3b are a pair of bearings fixed on the bottom portion 1b, which rotatably support the shaft 4.
Reference numeral 5 denotes 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 and 8b are two movable arms,
One end of each is fixed to gears 9a and 9b rotatably attached to the side surfaces 5a and 5b of the support member 5, respectively. Further, the gear 9a meshes with a gear 6a attached to the rotating shaft of the pulse motor 6. Reference numeral A denotes a fabric mounting table on which the fabric to be sewn is placed, and is fixed on the two movable arms 8a and 8b. The upper surface of this cloth mounting table A has a semi-elliptic spherical shape that is curved at different curvatures in the XY coordinate axes directions, approximately matching the curved surface of the cloth after sewing. It is made to match the curved shape of . That is, in the short side direction (X direction) it forms an arc shape with a radius R ₁ centered on the shaft 4, and in the long side direction (Y direction) it forms an arc shape with a radius R ₂ centered on the gear 9a. are doing. Note that A ₁ is an opening formed in this cloth mounting table A through which a needle passes. 10a,1
Reference numeral 0b denotes two cloth pressers that press down the cloth placed on the cloth mounting table A, and each has a cloth presser lever 11a, 11b and an air cylinder 12a, 1 connected thereto.
It is attached to support arms 8a, 8b via 2b. B is the cloth mounting table A and the presser foot 10a, 1
This is a moving mechanism for moving 0b in the XY coordinate axis direction, and is composed of a first drive mechanism consisting of a pulse motor 2, a gear 2a, and a gear 7, and a pulse motor 6, a gear 6a, a gear 9a, and a gear 9b. second to be done
It consists of a driving machine.

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

First, after properly placing the fastener b and the outer material a, which have been attached to the lining c in advance, along the curved surface of the cloth mounting table A, the air cylinders 12a, 1
2b to lower the presser plates 10a and 10b to fix the outer fabric a and the lining c. As a result, the fastener b and the outer material a draw a curve similar to the curve when the skirt is worn. In addition, the presser plate 10
A, 10b are raised and lowered by moving the rods 12a ₁ and 12b ₁ of the air cylinders 12a and 12b forward and backward using operating means (not shown), and by moving the presser foot lever 10 connected thereto.
This is done by rotating a and 10b.

Thereafter, the fabric mounting table A to which the outer material a and the fastener b are fixed is moved in the X direction or the Y direction by the moving mechanism B, and sewing work is performed using a well-known sewing mechanism. That is, Fuasner b
When sewing in the long side direction, the pulse motor 6 of the second drive mechanism is driven by a control means not shown, rotates the gear 9a, and
This is done while moving the cloth mounting table A together with 8b in the Y direction. Sewing in the short side direction is performed by rotating the shaft 4 together with the gear 7 by the pulse motor 2 of the first drive mechanism, and moving the support member 5, support arms 8a, 8b, and cloth mounting table A in the X direction. .

In this way, the outer material a and the fastener 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 fastener b are most stable. In addition, in Fig. 2, the chain line arrow indicates needle 1d.
indicates the direction. Therefore, unlike the above-mentioned conventional example, an unreasonable force is not applied during wearing, and a product without waviness as shown in FIG. 3 can be obtained. In addition, in the above embodiment, the fastener was attached to the side of the skirt.
The present invention is applicable to other types of sewing as long as the part is to be formed into a semi-ellipsoidal curved surface. 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 described above, the present invention has a cloth mounting table whose upper surface is a semi-ellipsoidal surface which is curved at different curvatures in the XY coordinate axes directions and substantially coincides with the curved surface of the cloth after sewing, and which is arranged above the sewing machine bed. By including a first drive mechanism that moves along the curvature in the X coordinate direction, and a second drive mechanism that is supported by the first drive mechanism and moves the cloth mounting table in the Y coordinate axis direction, Even an unskilled person can easily sew parts that need to be formed in a semi-elliptical shape, such as when attaching a zipper to a skirt, without the need for cram school training. This has the effect that sewn products can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the outer material and fastener 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 fabric is cut when the fastener is attached to the back of the skirt, and Figure 5 is the outer fabric when the fastener 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 cross-sectional view showing the fastener and outer material sewn together by conventional sewing work, and Fig. 8 is the state of the completed skirt when worn by conventional sewing work. FIG. A... Cloth mounting table, B... Moving mechanism, 2, 6...
Pulse motor, 5...Support member, 8a, 8b...
support arm.

Claims (1)

[Scope of Claims] 1. A pillar-shaped bed 1c that has a thread ring catcher and stands upward facing a head 1a that has a sewing machine needle and hangs down; A fabric mounting table A, which has an opening and is a semi-spherical surface that curves at different curvatures in the XY coordinate axes directions and approximately coincides with the curved surface of the fabric after sewing, is placed above the bed, and a fabric is fixed/released with respect to the mounting table. The presser feet 10a and 10b are movably supported at the base of the mounting table.
a first drive mechanism 2, 4, 5 that moves the cloth mounting table in the direction of the X coordinate axis along the line of curvature; A sewing machine for sewing curved surfaces, comprising: a second movable drive mechanism 6, 9a, 9b.