JP2000300873A - Buttonhole machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine for sewing a buttonhole by which a no. of variations for eyelet buttonhole sewing stitches can be done by a simple setting. SOLUTION: A buttonhole machine which forms eyelet buttonhole sewing stitches u0 contg. left and right side sewing-up parts u1 and u2 and top and bottom radial shape parts u3 and u4 by an electric control. In addition, a storing means for respectively storing up and down length related data which can define the radial length in the up and down direction of the radial shape parts u3 and u4 and left and right length related data which can define the radial length in the left and right direction of the radial shape parts u3 and u4, a set inputting means which can input the up and down length related data, and a controlling means wherein based on the up and down length related data and the left and right length related data, a needle location position is operated in such a way that the contour of the outer periphery of the radial shape part becomes an ellipsoidal shape in which either one of the radial length of up and down direction and the radial length of left and right direction of the radial shape part is the major axis and another one is the minor axis and sewing control which locates a needle at a needle location position obtd., are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole buttonhole sewing machine forming an eyelet buttonhole buttonhole seam.

[0002]

2. Description of the Related Art A buttonhole overlock sewing machine in which a buttonhole overlock stitch is formed by electric control and a buttonhole is formed at the center thereof is a conventionally known technique. No. 9863 discloses this. The buttonhole overlock sewing machine controls the feed amount of the cloth in the Y direction, controls the swing of the needle in the X direction (perpendicular to the Y direction), controls the amount of the swing, By performing a baseline position change control or the like for displacing the baseline position, which is the baseline of the needle swing, in the needle swing direction, the needle drop position on the workpiece is controlled, and the buttonhole stitches are formed at predetermined positions on the workpiece. (Including eyelets). Also, the conventional buttonhole overlock sewing machine is configured so that the shape and size of the buttonhole overlock stitch can be changed, and an operation panel capable of inputting a plurality of types of data to change these stitches is provided. The needle drop position is calculated based on a plurality of types of data that determine the pattern of the buttonhole stitches input by operating the operation panel, and the buttonhole stitching according to the plurality of types of data is performed. It has become. Then, the left and right side stitching portions u
An eyelet buttonhole stitch u0 composed of 1, u2 and upper and lower eyelet shaped parts u3, u4 is also formed (see FIG. 5).

[0003]

However, in the above-mentioned conventional buttonhole overlock sewing machine, when forming an eyelet buttonhole overlock stitch, the eyelet-shaped portions u3 and u4 are limited to those having a semicircular shape. When the width of the left and right side stitch portions u1 and u2 is determined, the size and shape of the eyelet-shaped portions u3 and u4 are also uniquely determined by the width. That is, there has been a problem that there are few variations in the shape of the eyelet buttonholes that can be set, and it is not possible to meet a wide variety of requirements.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a buttonhole overlock sewing machine that automatically forms buttonhole overlock stitches by electrical control, an eyelet buttonhole overlock stitch with a simple setting. An object of the present invention is to provide a buttonhole overlock sewing machine in which a large number of variations can be expected.

[0005]

In describing the following means,
A configuration corresponding to the embodiment is illustrated as an example by using brackets. In the case where the same words as those in the embodiment are used, only symbols are described. According to an aspect of the present invention, an eyelet buttonhole including left and right side stitches [u1, u2] and at least one of the upper and lower eyelet shaped parts [u3, u4] is provided by an electric control. Overcast seam [u
0], the buttonhole overlock sewing machine [1], the vertical length-related data (radial shape length data) capable of specifying the vertical length of the eyelet-shaped portion, and the left and right of the eyelet-shaped portion Left and right length related data that can specify the radial length in the direction (overcast data, knife groove width left data, and
Storage means [R
AM], setting input means [operation panel] capable of inputting the vertical length-related data, and at least one of the left and right eyelet-shaped portions based on the vertical length-related data and the horizontal length-related data. Outer contour [Q1, Q2]
Is a calculating means [CPU] for calculating the needle drop position so as to have a substantially elliptical or perfect circular arc shape, and a control means [CPU] for performing sewing control for dropping the needle to the needle drop position obtained by the calculating means. Buttonhole overlock sewing machine [1] provided with

According to the first aspect of the present invention, the shape of the eyelet-shaped eye portion is changed to a vertically long ellipse, a horizontally long ellipse, or the shape of the eyelet-shaped portion by inputting the vertical length-related data. Variety can be enriched.

Here, the vertical length-related data includes data directly indicating the vertical diameter and radius of the eyelet-shaped portion,
For example, data that can indirectly specify the diameter of the eyelet-shaped portion, such as the total length data of the eyelet buttonhole overlock stitch and the length data of the side stitched portion, may be used. For example, the diameter of the eyelet-shaped portion can be specified by subtracting the length data of the side stitched part from the total length data from the total length data of the eyelet buttonhole overlock stitch and the length data of the side stitched part. In addition, the left and right length related data is, in addition to the data directly indicating the diameter and radius of the eyelet-shaped portion in the left and right direction, for example, the width data of the side stitched portion, the width data of the side stitched portion, Data that can indirectly specify the diameter or radius of the eyelet-shaped portion in the left-right direction, such as data obtained by adding gap data with the side stitched portion, may be used. The elliptical arc shape of the outer contour of the upper and lower eyelet-shaped portions is an example of the shape, for example, based on the vertical length-related data and the left and right length-related data, the vertical length of the eyelet-shaped portion in the vertical direction And an elliptical shape in which one of the radial lengths in the left-right direction is the major axis and the other is the minor axis. In addition, the shape may be an elliptical shape that is obliquely inclined. In addition, at least one of the upper and lower eyelet-shaped portions is formed so that the left and right outer peripheral contours are respectively elliptical or circular arc-shaped, for example, by setting the upper and lower two eyelet-shaped portions to have two vertical diameters. By setting them to be different from each other, a pattern in which the upper and lower two eyelet-shaped portions have different lengths is also included. Also, for example, the width of the side stitching portion and the gap length between the button hole and the side stitching portion are included. When the left and right eyelets are set differently on the left and right sides, a pattern having an elliptical shape on the left and right sides of the upper and lower eyelet-shaped portions is also included. Also, it goes without saying that the upper and lower eyelet-shaped portions may be formed of the same ellipse or perfect circle. Further, the eyelet-shaped portion may be formed only on one of the upper and lower sides.

According to a second aspect of the present invention, in the buttonhole overlock stitching machine according to the first aspect, the stitches of the eyelet-shaped portion are formed by radially extending a plurality of lines from the center side of the stitch on the outer peripheral contour line of the stitch. Storage means [RAM] for storing radiation number data [radial shape stitch number data] relating to the number of the plurality of radially extending lines, and setting input means capable of inputting the radiation number data [operation panel The computing means may be configured such that, based on the radiation number data, the number of the plurality of lines radially extending from the center side of the stitch to the outer peripheral contour line is a number corresponding to the radiation number data. The needle drop position is calculated.

According to the second aspect of the invention, since the number of the plurality of radially extending stitch lines of the eyelet-shaped portion can be changed, the variation of the shape of the eyelet-shaped portion can be further increased.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG.
1 is a perspective view showing an overview of a buttonhole overlock sewing machine 1 according to an embodiment of the present invention. FIG. 2 is a perspective view mainly showing a cloth feeding and needle elevating mechanism of the buttonhole overlock sewing machine 1.
FIG. 3 is a perspective view mainly showing a needle raising / lowering mechanism and a needle swing mechanism of the buttonhole overlock sewing machine 1. The buttonhole overlock sewing machine 1 of this embodiment includes a sewing machine needle 9 for raising and lowering and swinging the needle to the left and right, a cloth presser 15 for holding a cloth (to be sewn), and a cloth holding and feeding cloth on the lower side. The cloth holding plate 14 that moves back and forth in the direction, the upper thread trimmer 80 that cuts the upper thread above the cloth presser 15, the cloth cutting knife 16 that cuts the cloth to form a button hole, and inputs various setting data. An operation panel (not shown) as setting input means, and a control circuit (not shown) for controlling the buttonhole overlock sewing machine 1
Etc. are provided.

The cloth holder 15 and the cloth holding plate 14 are
The cloth is held during the sewing and is moved back and forth in the cloth feeding direction to feed the cloth back and forth. As shown in FIG. 2, the cloth holder 15 is connected to the cloth feed member 23 via the connection arm 24, while the cloth holding plate 14 is directly connected to the cloth feed member 23. The cloth feed member 23 is fixed to a feed shaft 22 having a rack 22a, and moves forward and backward by driving a Y feed pulse motor 20 to move the cloth retainer 15 and the cloth holding plate 14 forward and backward.

The lifting mechanism for raising and lowering the sewing needle 9 is shown in FIG.
As shown in FIG. 3, the upper shaft 6, the sewing machine motor 5, the crank cam 7, and the like are formed, and the rotational drive of the sewing machine motor 5 is converted into a vertical movement by the crank cam 7 and transmitted to the needle bar 8. The sewing needle 9 is moved up and down. The upper shaft 6
The umbrella wheels 10a and 10b are linked to a lower shaft 11 via connection shafts 10 arranged at upper and lower ends, and are linked to a shuttle 12 connected to the lower shaft 11.

A needle swing mechanism for swinging the sewing machine needle 9 right and left includes a main needle swing mechanism for swinging the sewing machine needle 9 at a predetermined swing width with a certain base line as an origin, a swing width changing mechanism for changing the needle swing width, and It comprises a base line changing mechanism for changing the base line in the left-right direction.

As shown in FIG. 3, the main needle swing mechanism includes a needle bar swing table 18, a needle swing arm 49, a connecting shaft 48, and a connecting lever 4.
7, needle swing cam lever 46, triangular cam 54, gear 51,
By transmitting the rotational movement of the upper shaft 6 of the sewing machine to the triangular cam 54, the needle swing cam lever 46 is swung with a predetermined swing width. The sewing needle 9 is rotated by rotating the pivot 18 around the fulcrum 18a.
Is swung right and left. The needle swinging operation of the main needle swinging mechanism is linked to the elevating movement of the sewing machine needle 9 via the upper shaft 6, the needle bar 8 is moved on the base line at the timing when the sewing machine needle 9 descends for the first time, and the second time. The needle bar 8 is moved from the base line to a position of a predetermined swing width at the timing when the needle bar 8 descends.

The swing width changing mechanism changes the swing width of the needle swing cam lever 46 via the links 55 and 56 by the rotation of the needle swing feed pulse motor 41 to thereby control the sewing needle 9.
Change the swing width of. The base line changing mechanism rotates the base line changing lever 43 about the fulcrum 43a by the rotation of the base line feed pulse motor 40, and moves the position of the fulcrum 44a which determines the origin of the swinging motion of the needle swing cam lever 46. By changing, the base line position of the swing of the sewing machine needle 9 is changed. In this sewing machine, the needle bar 8 is moved to the left (the front side in FIG. 3) with respect to the set base line by the set swing width.
Is to be shaken.

An operation panel (not shown) is used to set and input various sewing parameters, display output of set values and display output of an error in sewing control. For example, a buttonhole overlock sewing machine 1 is mounted. It is provided on a sewing machine table to be placed.

Although not shown, the control circuit of the buttonhole overlock sewing machine 1 is a CPU (Central Proc).
essing Unit), ROM (Read On)
lyMemory), RAM (Random Access)
ss Memory), a Y-feed counter for counting the rotation amount of each pulse motor, a baseline feed counter, and a needle swing counter, a Y-feed pulse motor driver for driving each pulse motor, a baseline feed pulse motor driver, and a needle swing It includes a feed pulse motor driver, a sewing machine motor driver for controlling the drive of the sewing machine motor, a sewing machine motor encoder for coding the rotation amount of the sewing machine motor as the rotation angle of the upper shaft, and the like. The operation panel is connected to the control circuit via an I / O interface. An operation signal is input to the control circuit from the operation panel, or a display unit or display on the operation panel is input from the control circuit side. A display signal for operating the lamp is output. In addition, to the I / O interface, a presser switch for instructing the lifting and lowering of the cloth presser 15 and a start switch for instructing the start of driving of the sewing machine motor are connected.

The CPU uses a predetermined area of the RAM as a work area according to a control program stored in the ROM.
It performs data input processing from the operation panel, pattern calculation processing for calculating the needle drop position based on the sewing data, sewing processing for dropping the needle to the needle drop position calculated by controlling each pulse motor, and performing sewing. is there. That is, this CPU constitutes the calculating means and the control means. R
In the OM, control data and a control program for each process performed by the CPU are recorded. The RAM constitutes storage means for storing various sewing data of buttonhole overlock stitches input via the operation panel, in addition to the work area of the CPU.

Next, the types and contents of the sewing data which can be input from the operation panel and determine the sewing pattern of the buttonhole sewing will be described. FIG. 4 is a chart diagram of a data table showing data items that can be input from the operation panel. FIG. 5 is a diagram for explaining the correspondence between each data item in FIG. 4 and each part of the buttonhole overlock stitching. In the figure,
A data item name and a data number are described in each part of the eyelet buttonhole overlock stitch u0.

In the length data of each part that determines the sewing pattern of the buttonhole overlock stitch u0 (FIG. 5), the data items that can be input from the operation panel are as shown in the data table of FIG. That is, cloth cutting length data (length of the button hole groove u5 serving as a button hole), knife groove width right data (gap length between the button hole groove u5 and the left end of the right sewing portion u1), knife groove width left data (Gap length between the button hole groove u5 and the right end of the left sewn portion u2), overlock width data (left and right widths of the side sewn portions u1, u2), first gap (gap) data (upper eyelet shape portion u3) , The second gap data (upper eyelet-shaped portion u3)
, The pitch data of the parallel portion (the vertical distance between the two stitches of the side stitch portions u1 and u2), the radial shape length data (the eyelet shape portions u3 and u4) , The length in the up-down direction), and the number of radial shape stitches.

Here, the above-mentioned radial shape length data constitutes vertical length related data, and the overhang width data and the female groove width right data represent the horizontal axis radius of the right half of each of the eyelet-shaped portions u3 and u4. The left and right length related data to be specified is configured. The overhang width data and the female groove width left data constitute left-right length-related data for specifying the horizontal axis radius of the left half of each of the eyelet-shaped portions u3 and u4. The vertical length-related data is composed of the total length data of the eyelet buttonhole overlock stitch, the cloth cutting length data, the first and second gap data, and the like, and is indirectly the vertical length of the eyelet shape portions u3 and u4. Can be specified. In this embodiment, the upper and lower eyelet-shaped portions u3 and u4 have the same length in the vertical direction. However, the upper and lower eyelet-shaped portions u3 and u4 have the same length in the vertical direction. It is good also as a structure which can be set to a different length.

The radial shape stitch number data is data relating to the number of radially extending stitching lines of the eyelet-shaped portions u3 and u4. Specifically, the eyelet-shaped portions u3 and u4 are divided into right and left parts. Sewing lines k0, k180 at θ = 0 ° or 180 ° around the origin O in one of the ranges
And a sewing line k90, k2 at θ = 90 ° or 270 °
This is data indicating the number of remaining sewing lines excluding 70.
In the sewing pattern shown in FIG. 5, the radial shape stitch number data is “3”.

Each of the above-mentioned data items can be set and input by the operator appropriately operating the operation panel. Further, the operator inputs data of a plurality of patterns in advance,
By selecting one pattern from the plurality of patterns, the data of each data item can be set.

Next, a description will be given of a calculation process of the needle drop points (particularly, the needle drop points P _{0 to} P _{10 of the} eyelet-shaped portion u3) performed based on the input data of each data item that can be input from the operation panel. FIG. 6 is a diagram illustrating the needle drop position of the eyelet buttonhole buttonhole stitch u0 sewn by the buttonhole buttonhole stitch sewing machine 1. The calculation process of the needle drop point of the sewing pattern is started based on, for example, an input operation of a start switch that supports the start of sewing after input or selection of setting data by a user.
This is executed by the PU.

Needle drop points P0 forming eyelet-shaped portions u3
Needle drop point P on the outer contours Q1 and Q2 of P10
1, P3, P5, P7, and P9 are obtained from the equations of the ellipses forming the outer contours Q1 and Q2. Since the eyelet-shaped portion u3 may have different elliptical shapes on the left and right, the left and right are processed separately for the left and right. That is, the right side of the outer peripheral profile Q1 of which divides the eyelet-shaped portion u3 left or right, since it is ellipses major axis and a minor axis radius b and a radius a _1, respectively, the origin O and the XY coordinates (X: (Xn, Yn) satisfying the following expressions (1) and (2) in the horizontal direction (Y: vertical direction). (Xn / a ₁ ) ² + (Yn / b) ² = 1 (1) Xn> 0, Yn> 0 (2) Here, the radius a ₁ is the length a ₀ indicated by the overcast width data. This is the sum with the length L1 indicated by the knife groove width right data.

Further, since the number of needle drops on the outer peripheral contour Q1 is set by the radial shape needle number data, the needle drop point can be determined based on these conditions. In this embodiment, the arithmetic processing is performed so that the needle drop points on the outer peripheral contours Q1 and Q2 are equally divided at the center angle θ. Therefore, when the value of the radial shape stitch number data is “t (= 2)”, the central angle is “90 °”.
/ (T + 1) ", and the two angles represented by the following equation (3) are obtained. θn = 30 °, 60 ° (3) A point on the outer peripheral contour Q1 at an angle of θn from the center can be expressed by the following equation (4). Yn = Xn · tan (θn) (4) From the conditions of the above equations (1) to (4), the needle drop points P7 and P9 included in the right half of the eyelet-shaped portion u3 are uniquely obtained.

[0027] Similarly, the outer peripheral contour Q2 of the left inner dividing the eyelet-shaped portion u3 left or right, since it is ellipses major axis and a minor axis radius b and the radius a _2, respectively, X whose origin O
A point of (Xn, Yn) satisfying the following equations (5) and (6) at the Y coordinate (X: left-right direction, Y: up-down direction). (Xn / a ₂ ) ² + (Yn / b) ² = 1 (5) Xn <0, Yn> 0 (6) where the radius a ₂ is the length a ₀ indicated by the overcast width data. This is the sum with the length L2 indicated by the knife groove width left data.

Further, from the number of needle drops on the outer peripheral contour Q2 based on the radial shape stitch number data, when the value of the radial shape stitch number data is "t (= 2)", the central angle is "90 ° / (t + 1)".
To obtain two angles represented by the following equation (7). θn = 120 °, 150 ° (7) From the conditions of the above equations (4) to (7), the needle drop points P1 and P3 included in the left half of the eyelet-shaped portion u3 are uniquely obtained. In the above description, the eyelet-shaped portion u3 has been described as an elliptical shape. However, if a ₁ = b or a ₂ = b at this time, the coordinates of the outer peripheral contour portion are of course a perfect circle.

The needle drop point P5 at the center of the outer peripheral contours Q1 and Q2 of the eyelet-shaped portion u3 is (X, Y) = (0,
This is point b). Needle drop point P on the center side of eyelet-shaped portion u3
0, P2, P4, P6, P8, and P10 are calculated as points at which the knife groove width is equally divided from the origin O in each of the right and left ranges. That is, when the value of the radial shape stitch number data is “t (= 2)”, the length from the origin O to the left end of the right sewn portion u1 based on the number of needle drops on the outer peripheral contour Q1 based on the radial shape stitch number data. The needle drop interval is obtained by dividing L1 by “t + 0.5”. Here, “+0.5” means that the number of needle drop points on the left and right is an even number.
(P6). From the origin O to the right end of the right sewn portion u2, the length L2 from the right end to "t + 0.
5 "to obtain the needle drop interval. Then, from these needle drop intervals, the needle drop points P0, P2, P4,
The coordinates of P6, P8, and P10 are obtained.

FIG. 7 is a view showing another example of the needle drop position of the buttonhole overlock stitch u0 sewn by the buttonhole overlock stitch machine 1. The needle drop point on the center side of the eyelet-shaped portions u3 and u4 is similar to the above sewing pattern, for example, a circle or an ellipse corresponding to the width of the female groove centered on the origin O as shown in FIG. It may be a point on a line segment such as. As the calculation method, various methods can be appropriately used, and description thereof will be omitted. The embodiment shown in FIG.
While the above-mentioned needle drop point was calculated so as to be equally divided at its central angle θ by the eyelet-shaped needle number data, FIG. 8 shows the needle drop point by the eyelet-shaped needle number data. 9 shows an embodiment in which arithmetic processing is performed so that the vertical length of the shape portion is equally divided.
In this case, when the value of the eyelet shape data is “t (= 2)”, the vertical diameter b of the eyelet shape portion is equally divided by b / (t + 1), and the needle drop point on the outer peripheral contour Q1 is determined. The Y coordinate is a value represented by the following equation. Y9 = b / 3, Y7 = 2b / 3 (8) Therefore, from the equations (1), (2), and (8), the eyelet-shaped portion u3
The needle drop points P7 and P9 included in the right half of the above are uniquely obtained, and other needle drop points can be calculated according to the above-described embodiment, and description thereof will be omitted.

Although the calculation of the needle drop point of the upper eyelet-shaped portion u3 has been described above, the calculation of the needle drop point of the lower eyelet-shaped portion u4 can be similarly performed. The calculation of the needle drop point at the side stitching portion can be performed in the same manner as the conventional one.

When the needle drop point of the sewing pattern is obtained by the above-mentioned arithmetic processing, the sewing processing is started and the CPU
By the above control, each pulse motor is appropriately driven and controlled. As a result, the needles are sequentially dropped to the obtained needle drop points, and the sewing pattern determined by the setting data is sewn.

As described above, according to the buttonhole overlock sewing machine 1 of this embodiment, the radial shape length data indicating the vertical diameter of the eyelet-shaped portions u3 and u4 is input.
The shape of the eyelet-shaped portions u3, u4 can be a vertically long ellipse or a horizontally long ellipse, and the shapes of the eyelet-shaped portions u3, u4 can be richly varied. In addition, the eyelet shape portion u
Since the number of the plurality of stitch lines radially extending from 3, 3 can be changed in various ways by setting the number-of-radial-shape stitch data, variations in the shapes of the eyelet-shaped portions u3, u4 can be further enriched.

The present invention is not limited to the buttonhole overlock sewing machine 1 of this embodiment.
The vertical length-related data and the left and right length-related data may be any data as long as the upper and lower diameters and the left and right diameters of the eyelet-shaped portion can be specified, respectively. Sewing pattern on the center and outer contour
It is not limited to a pattern composed of stitches connecting points, for example,
There can be various patterns, such as a pattern in which a needle drop point is provided between the central portion and the outer peripheral contour, and a pattern in which the outer peripheral contour is formed by stitches. In addition, the detailed configuration specifically shown can be appropriately changed without departing from the gist of the invention.

[0035]

According to the first aspect of the present invention, the shape of the eyelet-shaped part is changed to a vertically long ellipse or a horizontally long ellipse by inputting the vertical length-related data indicating the vertical diameter of the eyelet-shaped part. Or the variation of the shape of the eyelet-shaped part can be abundant.

According to the second aspect of the present invention, since the number of the plurality of radially extending stitch lines of the eyelet-shaped portion can be changed, the variation of the shape of the eyelet-shaped portion can be further increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overview of a buttonhole overlock sewing machine according to an embodiment of the present invention.

FIG. 2 is a perspective view mainly showing a cloth feed and a needle elevating mechanism of the buttonhole overlock stitch sewing machine.

FIG. 3 is a perspective view mainly showing a needle raising / lowering mechanism and a needle swing mechanism of the buttonhole overlock sewing machine.

FIG. 4 is a chart diagram of a data table showing parameters that can be input from an operation panel.

FIG. 5 is a diagram illustrating the correspondence between each data item in FIG. 4 and each part of the eyelet buttonhole overlock stitching.

6 is a view showing needle drop positions of a sewing pattern sewn by the buttonhole overlock sewing machine shown in FIG. 1;

FIG. 7 is a view showing another example of the needle drop position of the sewing pattern sewn by the buttonhole overlock sewing machine shown in FIG. 1;

FIG. 8 is a view showing another example of the needle drop position of the sewing pattern sewn by the buttonhole overlock sewing machine of FIG. 1, showing a sewing pattern in which the vertical length of the eyelet-shaped portion is equally divided; It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buttonhole overlock sewing machine 9 needle 15 Cloth presser 16 Cloth cutting knife 20 Y feed pulse motor 40 Base line feed pulse motor 41 Needle swing feed pulse motor 80 Thread cutting scissors u0 Eyelet buttonhole overlock stitch u1, u2 Side stitching part u3 u4 Eyelet-shaped part u5 Buttonhole groove P0-P10 Needle drop point in eyelet-shaped part Q1, Q2 Outer contour of eyelet-shaped part

Claims (2)

[Claims] 1. A buttonhole buttonhole sewing machine forming an eyelet buttonhole buttonhole stitch including left and right side stitch portions and at least one of the upper and lower eyelet shape portions by electrical control. Storage means for storing the vertical length-related data that can specify the diameter of the eyelet, and the left-right length-related data that can specify the diameter of the eyelet-shaped portion in the left-right direction. Setting input means capable of inputting, based on the upper and lower length related data and the left and right length related data, at least the upper and lower outer periphery contours of the left and right eyelet-shaped portions respectively become substantially elliptical or a perfect circular arc shape. Buttonhole sewing, comprising: a calculating means for calculating a needle drop position; and a control means for performing sewing control for dropping a needle to the needle drop position determined by the calculating means. Sewing machine. 2. The stitch of the eyelet-shaped portion is formed by radially extending a plurality of lines from the center side of the stitch on the outer peripheral contour line, and the radiation number related to the number of the plurality of radially extending lines Storage means for storing data; and setting input means capable of inputting the radiation number data, wherein the calculating means radially extends from the center side of the stitch to the outer peripheral contour line of the stitch based on the radiation number data. 2. The buttonhole overlock sewing machine according to claim 1, wherein the needle drop position is calculated so that the number of the plurality of extending lines is a number corresponding to the radiation number data.