JPH03221090A - Embroidering by automatic embroidering machine - Google Patents

Abstract

PURPOSE:To obtain a beautiful drawing-like picture by specifying intervals between basic components. CONSTITUTION:Embroidering sewn by repeating basic components continuously along motif outlines is performed for a value D of approximately 1.0 as a fractal expressed by D=log(n1Xn2/m)/log(1/1.41XN1/a) to which a dimension is applied. N1 refers to a distance between basic components, n2 refers to an average length of line segments of the components, and (m) refers to a zigzag width. For a drawing-like embroidering by an automatic sewing machine, stitches of preferable appearance having no extreme difference for the roughness of stitches between the inner side and outer side curved lines of curved parts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of sewing line embroidery using an automatic embroidery machine.

(Prior art) Conventional embroidery machines sew line drawing embroidery using straight stitches or zigzag stitches (
Zigzag stitching is performed especially in curved sections because the needle bar is sewn with a slow amplitude movement in the lateral direction and the fabric is sewn with a reciprocating movement from side to side.
), the stitches become dense, and on the outside (O in Figure 1), the stitches become coarse, and the balance between the inside and outside is lost; ), the thread would swell and the quality of the embroidery would be unsatisfactory (see Figure 1).

(Problems to be Solved by the Invention) The present invention particularly improves line drawing embroidery using an automatic embroidery machine! ! The present invention relates to an embroidery sewing method that can obtain seams with a desirable quality without causing a significant difference in the roughness of the seams on the inside and outside of a curved line.

(Means for Solving the Problems) The present invention is designed to prevent line drawing embroidery using an automatic embroidery machine from causing a significant difference in the roughness of the stitches between the inside and outside of the curved part of the embroidery. By using a continuous pattern based on the idea of fractal geometry theory, it is possible to obtain seams with a desirable finish.

(Function) The present invention includes a needle bar that is moved up and down in conjunction with the rotation of a drive shaft supported on an arm frame of a sewing machine, and a needle bar that is supported on a bed frame of a sewing machine and that is moved up and down in response to the vertical movement of the needle bar. In an automatic embroidery machine that is provided with a fabric tensioning frame that is supported so as to be able to move horizontally in time, and a control data storage unit that stores control data for controlling the horizontal movement of the fabric tensioning frame, Embroidery that is sewn by continuously dotting the basic structure along the line is D-Qog (n+Xnt/m)/Uog (1/1.41
D applying the fractal dimension shown by xN+/a)
It is characterized in that the values are approximately set in increments of 10.

(Example) Examples of the present invention will be described below.

Reference numeral 1 denotes an arm frame of the sewing machine, and a drive shaft is rotatably supported inside, and the needle bar is moved up and down in conjunction with the rotation of the drive shaft. A needle is detachably fixed to the lower end of the needle bar. Reference numeral 2 denotes a head frame of the sewing machine, in which a thread ring catching mechanism is disposed, and is made to intersect with the needle of the needle bar.

Reference numeral 3 denotes a cloth stretching frame, which is supported on the bed machine frame 2 so as to be movable in the horizontal direction, and is detachably fixed to the carriage of the embroidery frame drive mechanism. A control data storage unit storing control data for horizontally driving the cloth tensioning frame 3 is provided within the sewing machine frame (see FIG. 8).

Next, we will discuss the embroidery sewing method.

Generally, a geometrical shape that can be reduced and decomposed into N parts by a similarity ratio r has a non-integer dimension according to the following basic formula (1). If the dimension is larger than the topological dimension, it is said to be a fractal figure.

D −, Q ogN/Uog (1/r) = basic formula (1)
Applying the above concept to the sewing method using a sewing machine results in the following equation (2) (see Figure 2).

D=Uog(2xnxn,/N+)/Uogn-formula (2
) However, the number of divisions of n, the length of the seam N1, and the distance between the basic components n: N. However, the glue in the above equation (2) changes greatly depending on the value of n, so we can change the way we look at the similarity transformation. The above formula (1
), apply the distance NI between the two basic configurations to the thread thickness a to the number of line segments n3.1/r, and furthermore, the length of each line segment of the basic configuration is uniform. Since it is not, weight it and set the average length to n2 and the zigzag width to m,
If the reduction ratio is 1/rl and zigzag sewing is performed, the sewing result will be a surface, so here the dimension is D if it is a point.
1=0, if line,=1. In the case of a surface, Dl-2
Therefore, the constant 1/1.4 is set so that the dimension is D1-2.
Put 1 into the equation.

From the above, the above basic formula (1) becomes as follows.

Dt-! Qog(n, xr+y/m)/Qog(1/1
．． 41xN+/a)...Formula (3) D2 in zigzag sewing (due to close contact) of the above formula (3)
Since N=2a, n1=2, and n2=m, we get the following.

D2-Uog (2xm/m)/Uog (1/1.41
x 2 a / a) - Uog2zl! ogl, 41
= 2, that is, it is two-dimensional and can be considered as a surface.

However, in reality, it is impossible to sew on curved sections due to the thickness of the thread (a), the structure of the fabric, the shape of the pattern, etc., so the best sewing method that can be experimentally obtained is multidimensional.

It turned out to be -1.

Next, an experimental example according to the present invention will be shown below.

Example 1: Sewing along line C shown in Figure 3 1-(1):
If A part is N1-1Oa*, D=0.26B part is N,
=38, then D=0.48* mark is the minimum value that can actually sew part A.

1-(2): If each part of A-B is N+=10a, then D=
026, and in the example of 1-(1) above, there is a difference between each part of A and B, so the variation is noticeable, and in the example of 1-(2) above, the dimensionality is much smaller than 1, so the closeness of the threads of the pattern is The embroidery quality will be poor because the surface structure at the straight line part B will be poor, and the embroidery quality will be poor.

Example 2: When sewing with different types of basic configurations shown in Figures 4 to 6 2-(1): For the basic configuration shown in Figure 4, suppose N+=
If I Oa, n+-8n2/m=1.2 (calculated value from the figure), then D=0.85. Therefore, in order to obtain D=1, it can be obtained by setting N16.8 a.

2-(2): In the basic configuration shown in Figure 5, temporarily Nr-10
If a, n+=6, nx/m=I, 35 (value calculated from the figure), D=079. Therefore, N to get D-1.

It can be obtained by setting 5.7 a.

2-(3): In the basic configuration of FIG. 6, if N, -5a, n, -4, a2/m = 0.7 (value calculated from the figure), then D = 0.53. Therefore D
To make = 1, N, = 1.

It can be obtained by setting 9a.

Although each of the basic configurations shown in Figures 4 to 6 has a single structure, it has continuity; by the way, the continuous pattern of the basic configuration shown in Figure 5 is the 7th one.
The sewing pattern will be as shown in the figure. Numbers 1-18 shown in FIG. 7 indicate the order of the needles.

As described above, the embroidery sewn using each basic configuration of Example 2 has D=1, so that each part n1, m of equation (3)
The embroidery that is sewn with each numerical value set for 2/m and N+/a maintains the balance of the stitches better than the zigzag stitch of Example 1, giving it a sense of stability.

The attached reference figures 1 to 3 show how to sew a pattern having straight parts and curved parts by the conventional method and the method of the present invention.
This is based on the basic configuration shown in the figure, and Reference FIG. 3 is based on the basic configuration shown in FIG.

The present invention is a sewing method in which beautiful line drawing embroidery can be obtained by determining the spacing of the basic configuration so that the above formula (3) % formula %) is approximately I. It has a wide practical effect.

[Brief explanation of drawings]

Figure 1 is a plan view of embroidery using the conventional sewing method, Figure 2
The figure is a plan view showing the basic configuration of the present invention, FIG. 3 is a plan view showing the straight line part and inner line part of line drawing embroidery, FIGS. 4 and 5,
Fig. 6 is a plan view of the basic configuration applied to the present invention, Fig. 7 is a continuous circular plan view of the basic configuration shown in Fig. 5, Fig. 8 is an external view of a sewing machine implementing the present invention, Reference Fig. 1 3 are plan views of examples.

Claims (1)

[Claims] A needle bar that is moved up and down in conjunction with the rotation of a drive shaft supported on a sewing machine arm frame, and a needle bar that is supported on a sewing machine bed frame and is timed to the up and down movement of the needle bar. An automatic embroidery machine is equipped with a fabric tensioning frame that can be moved horizontally by moving the fabric tensioning frame, and a control data storage unit that stores control data for controlling the horizontal movement of the fabric tensioning frame. The embroidery that is sewn by repeating the basic structure is D=log(n_1×n_2/m)/log(1/1.
An embroidery method using an automatic embroidery machine, characterized in that the embroidery is performed with the value of D applied to the fractal represented by 41×N_1/a) approximately 1.0.