JPH04244185A - Sewing machine device - Google Patents

Abstract

PURPOSE:To provide a sewing machine which can easily designate a sewing pattern having geormetrical shape such as circle, rectangle, etc., and sew the pattern with a simple operation. CONSTITUTION:An embroidering frame as a needle dropping point control means is shifted to align a sewing machine needle 21 with the center of a circular wappen W. Next, an embroidering frame is shifted to align the needle 21 with a desired position on the peripheral edge of the circular wappen W, so that a plurality of points for specifying the geometrical shape of a sewing pattern around the circular wappen W are inputted. Then, the circular sewing pattern specified from a plurality of inputted points is automatically formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly to a sewing machine that automatically forms a sewing pattern having a predetermined geometric shape.

0002

2. Description of the Related Art In conventional home-use sewing machines with embroidery devices, when sewing along a predetermined geometric shape, such as when attaching a patch, it is common to manually control cloth feed.

For example, when sewing a circular patch, the fabric to which the patch is temporarily attached is rotated by hand, and the periphery of the patch is sewn using zigzag stitches or the like.

0004

[Problem to be Solved by the Invention] When forming a sewing pattern with a predetermined geometric shape, such as in conventional patch attachment, the cloth feeding direction must be manually controlled as described above, which requires advanced sewing techniques. It required skill and skill to perform the work to obtain good sewing results.

[0005]Also, there is a method in which cloth feed is controlled using an XY table or the like and sewing is performed based on a programmed sewing pattern, but this method uses a CAD device or the like or inputs numerical values in advance. This method requires a pattern to be created in advance, requires complicated hardware, and is cumbersome to operate, so it is not a method that can be easily implemented using a home sewing machine or the like.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a sewing machine device that can easily specify sewing patterns having geometric shapes such as circular and rectangular shapes, and can perform sewing with simple operations. be.

[0007]

[Means for Solving the Problems] In order to solve the above problems, in the present invention, in a sewing machine device that automatically forms a sewing pattern of a predetermined geometric shape, the needle drop point of a sewing machine needle is set at a predetermined position. and a means for inputting predetermined coordinate information by moving the needle drop point by the needle drop point control means, the needle drop point control means for specifying the geometrical shape of the predetermined sewing pattern. A sufficient number of points included in the geometrical shape are inputted by controlling the needle drop point control means using the inputting means to input a plurality of points that specify the geometrical shape; A configuration is adopted in which a predetermined point among the points is used as a starting point for sewing, and a sewing pattern having a predetermined geometric shape specified from the plurality of input points is automatically formed.

[0008]

[Operation] According to the above configuration, by controlling the needle drop point control means, the geometrical shape of a predetermined sewing pattern is specified, and from then on, sewing having the geometrical shape specified from the plurality of input points is performed. Patterns can be automatically formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 1 shows the structure of a sewing machine employing the present invention. FIG. 1 shows a sewing machine 20 having an embroidery frame 2 that can be controlled in the X and Y directions. The internal mechanism of the sewing machine 20 and the XY table mechanism used to control the embroidery frame 2 are as follows:
It shall have a structure similar to a known one.

The sewing machine needle 21 of the sewing machine 20 is driven up and down in synchronization with cloth feeding by an internal sewing machine drive motor.

The sewing machine 20 has a circular patch attachment switch 5 and an embroidery frame movement key 6 located at easy-to-operate positions on the main body.
has. The circular emblem attaching switch 5 is used to instruct the start of sewing a circular emblem by a method to be described later.

The embroidery frame movement key 6 also moves the embroidery frame 2 to an appropriate sewing position during patch attaching and other sewing operations.
used for moving. The embroidery frame movement key 6 is
They are configured as four-direction arrow keys 61 to 63, and these keys are arranged in directions that match the movement of the embroidery frame 2 in the front, rear, left, and right directions when viewed from the user.

FIG. 2 shows the operation when the left key 61 is operated, and this key operation causes the embroidery frame 2 to move to the left as shown by the arrow. The operation for attaching the patch will be described later.

Further, a start/stop switch 7 is provided near the sewing machine needle 21 on the main body of the sewing machine, and this start/stop switch 7 is used to instruct the start of a predetermined sewing operation.

FIG. 3 shows the configuration of the control system of the sewing machine shown in FIGS. 1 and 2.

In FIG. 3, reference numeral 30 denotes a control unit 30 consisting of a microprocessor or the like, which controls an X-direction feed motor 8 and a Y-direction feed motor 9, which drive the embroidery frame 2 in the X and Y directions via drivers 31 and 32. control.

The control section 30 also controls the sewing machine drive motor 10, which is the main drive section of the sewing machine, via the driver 32.

The sewing operations executed by these motors are performed according to the operations of the start/stop switch 7 and the embroidery frame movement key 6, and also according to the position of the sewing machine needle 21 and other parameters necessary for sewing control. It is controlled by the control unit 30 while referring to the output of the sensor 11 to be detected.

The control unit 30 can control the needle drop point of the sewing machine needle 21 to a desired coordinate point (X, Y) in a Cartesian coordinate system with the origin (0, 0) at the control position of a suitable embroidery frame 2. shall be taken as a thing.

Next, the operation of the above configuration will be explained with reference to FIG. 4 and subsequent figures.

FIG. 4 shows the flow of a control program for circular patch attaching processing of the control section 30, which is stored in the ROM of the control section 30. Further, FIGS. 5 and 6 show the sewing operation when attaching a circular patch.

In step S1 of FIG.
detects whether or not the circular emblem attachment switch 5, which designates circular emblem attachment, has been pressed. If step S1 is affirmative, the process advances to step S2.

In step S2, the current position of the embroidery frame 2 is set to the center position of the circular patch (origin (X0, Y0):
=Y0=0). That is, the XY coordinate system for needle drop point control is set as shown in FIG. In FIG. 5, the symbol W indicates the outer periphery of the patch.

[0025] In step S2, the above processing is performed, so the user must press the embroidery frame movement keys 6 (61 to 64) in advance.
Using the embroidery frame 2, move the embroidery frame 2, set the sewing machine needle 21 to the center of the circular emblem, and then press the circular emblem attachment switch 5. Note that after entering the patch attaching mode, other switches may be used to set the center.

Next, in step S3, the user moves the embroidery frame 2 using the embroidery frame movement key 6, and sets the position of the sewing machine needle 21 to be on the desired end (periphery) of the circular patch. The coordinates at this time are recognized by the control unit 30 as the coordinates (X1, Y2) of the start point S0 (see FIGS. 5 and 6).

In step S4, the start/stop switch 7 is pressed, and the start/stop switch 7 is pressed.
If the button is pressed, the process advances to step S5, and the radius R of the patch is calculated from the coordinates of the start point S0.

The radius R is the origin (X0, Y
0) and the starting point S0 (X1, Y2), so

[0029]

[Math 1]

It can be shown as follows.

[0031] In steps S6 and S7, the needle drop points are successively moved to perform zigzag sewing. At this time,
The sewing machine drive motor 10 moves the sewing machine needle 21 up and down. Further, movement of the embroidery frame 2 for performing needle drop point control, which will be described later, is performed by controlling the X-direction feed motor 8 and the Y-direction feed motor 9. The X-direction feed motor 8 and the Y-direction feed motor 9 must be driven when the sewing machine needle 21 is out of the fabric, but this timing is determined by the sewing machine needle position sensor or the main shaft sensor that detects the rotational phase of the main shaft of the sewing machine. It can be detected using

The needle drop point is controlled as shown in FIGS. 5 and 6. In zigzag stitching, as shown in FIG. 5, needle drop points may be sequentially set at points equidistant from the periphery of the patch to the outside and inside.

FIG. 6 shows a needle drop point P1 near the start point S0.
~P4 is shown. Sewing may start from either the outside or the inside of the patch W, but here it starts from the outside.

In the case of FIG. 6, the control section 30 first moves the embroidery frame 2 so that the sewing machine needle 21 is aligned with the needle drop point P1, and thereafter controls the needle drop points P2, P3, and P4. Perform sewing.

At this time, the outer and inner needle drop points on the same radius of the patch W are treated as one set, and as shown in FIG. Let θ be the angle formed by the radius that includes the set.

The needle drop point can be handled through this angle θ. That is, using the angle θ, the general coordinate expression of the outer needle drop point Pa and the inner needle drop point Pb that are lined up on a certain radius is as follows: Pa: ((R+L/2)Cosθ, (R+L/
2) Sinθ)Pb: ((RL/2)Cos
θ, (RL/2)Sinθ). Here, L is the pitch of the inner and outer needle drop points Pa and Pb.

The increment Δθ of the angle formed by the radii including a pair of adjacent needle drop points can be determined according to the radius R of the patch, the zigzag stitch pitch setting set by the user, and the like. That is, if Δθ=2π/k, the value of k can be determined as appropriate according to the above conditions.

As described above, when changing θ by a predetermined increment, it is determined in step S7 whether the sewing machine needle 21 has been moved to one set of outer and inner needle drop points at least k times. By detecting this, it is possible to detect the end of sewing.

[0039] Also, based on the radius including the previous set of needle drop points, ΔPa: ((R+L/2)CosΔθ, (R+
L/2)SinΔθ)ΔPb: ((R-L/2
)CosΔθ, (RL/2)SinΔθ), it is also possible to obtain the increments ΔPa and ΔPb of the XY coordinate values to the next set of needle drop points. In this case, the end of sewing may be detected in step S7 by determining whether the X coordinate X of the needle drop point has become the same as the X coordinate X1 of the start point.

Cosθ, Sinθ, or CosΔθ
, SinΔθ may be calculated one by one, but it is also possible to prepare a table in advance and read out and use appropriate values according to the sewing pitch and the diameter of the patch. The method using a table allows faster control.

Note that even when using patterns other than zigzag stitching, the formula for calculating the needle drop point shown above can be used. According to the above embodiments, advanced sewing techniques are not required;
You can automatically sew around the patch.

According to the above configuration, by indicating the center position of the patch to the device and then specifying a predetermined position on the periphery, automatic sewing can be easily performed on the spot without the need for creating troublesome CAD data. Control becomes possible.

In the above description, by specifying the center of the circular patch and one point on the outer periphery, the apparatus is made to recognize the circular shape to be sewn. However, the method for recognizing the size of the patch is not limited to this.

For example, in the case of a circle, the circle can be specified by specifying two points on a straight line passing through the center of the circle, or by specifying three points on the circumference. In that case,
By preparing an appropriate calculation formula, you can calculate the diameter (or radius) and center coordinates, and then use the specified input point (
For example, the needle drop point can be controlled by the above method using the last input point) as the starting point.

Furthermore, although circular patches have been illustrated above, the shape of the patches is not limited to circular shapes. For example, for rectangular patches such as rectangles and squares,
By specifying two diagonal points, the shape of a rectangle can be specified.

Even if the sewing pattern is polygonal, the specific sewing pattern can be automatically sewn by having the user move the embroidery frame 2 to a plurality of points where a specific shape can be specified.

[0047] In the above, patch attachment has been exemplified; however, when forming a sewing pattern having a desired geometric shape such as a circle, rectangle, or polygon, the same control as described above can be performed. Not even.

[0048]

As is clear from the above, according to the present invention, in a sewing machine device that automatically forms a sewing pattern of a predetermined geometric shape, a needle drop point that controls the needle drop point of a sewing machine needle to a predetermined position is provided. point control means; and means for inputting predetermined coordinate information by moving the needle drop point by the needle drop point control means, and a sufficient number of coordinate information to specify the geometrical shape of the predetermined sewing pattern. A plurality of points included in the geometrical shape specify the geometrical shape by controlling the needle drop point control means using the inputting means, and further, among the plurality of inputted points, Since the fixed point is used as the sewing starting point and a sewing pattern having a predetermined geometric shape specified from the plurality of input points is automatically formed, the sewing pattern can be automatically formed by moving the needle drop point control means. , it is possible to specify the geometric shape of a given sewing pattern, and then automatically form a sewing pattern with the specified geometric shape from multiple input points, eliminating the need for troublesome CAD data in sewing operations such as patch attachment. An excellent effect is that a sewing pattern having a predetermined geometric shape can be easily and automatically formed without creating one.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a sewing mechanism of a sewing machine device of the present invention.

FIG. 2 is an explanatory diagram showing the sewing mechanism and operation of the sewing machine device of the present invention.

FIG. 3 is a block diagram showing the configuration of a control system of the sewing machine device of the present invention.

FIG. 4 is a flowchart showing a control procedure of the control unit in FIG. 3;

FIG. 5 is an explanatory diagram showing a sewing operation by the sewing machine device of the present invention.

FIG. 6 is an explanatory diagram showing a sewing operation by the sewing machine device of the present invention.

[Explanation of symbols]

1...cloth 2...Embroidery frame 4...Circular emblem 5...Switch with circular patch 6...Embroidery frame movement key 7...Start/stop switch 8...X direction feed motor 9...Y direction feed motor 10...Sewing machine drive motor 11...Sensor 21...Sewing machine needle 31-33...driver

Claims (1)

[Claims] 1. A sewing machine device that automatically forms a sewing pattern having a predetermined geometric shape, comprising: needle drop point control means for controlling the needle drop point of a sewing machine needle to a predetermined position; means for inputting predetermined coordinate information by moving a falling point, and the input means inputs predetermined coordinate information to a plurality of points included in the geometric shape of the predetermined sewing pattern in a sufficient number to specify the geometric shape of the predetermined sewing pattern. A plurality of points for specifying the geometrical shape are input by controlling the needle drop point control means using A sewing machine device that automatically forms a sewing pattern having a predetermined geometric shape specified from input points.