KR20020067967A - A sewing machine for overlocking botton holes - Google Patents

Abstract

PURPOSE: To provide a button holing sewing machine which can form a button hole with good appearance to appeal higher class feeling. CONSTITUTION: A RAM 3 to store pattern data for forming an eyelet holing seam M with an eyelet part T and right and left side sewing parts S1, S2 and a CPU 1 to form the eyelet holing seam M based on seam data prepared based on the pattern data are equipped to form this button holing sewing machine 100. Pattern data include a 'side sewing part left knife space adjusting value' (1c) for setting a distance in between a side sewing part S1 and a cut in SR to a value different from a distance in between a side sewing part S2 and the cut in R and a CPU 1 corrects seam data based on the 'side sewing part left knife space adjusting value' (1c).

Description

Button hole making sewing machine {A SEWING MACHINE FOR OVERLOCKING BOTTON HOLES}

TECHNICAL FIELD The present invention relates to a buttonhole sewing machine, and more particularly, to the setting of a messpace for sewing sewing.

BACKGROUND ART Conventionally, an electronic buttonhole sewing machine is known which automatically forms a buttonhole and performs sewing sewing around the buttonhole.

In such a buttonhole sewing machine, a plurality of pattern data are stored for the size and shape of the buttonhole sewing machine that can be formed, and a predetermined buttonhole sewing is performed by calling one of them on the operation panel.

For example, as shown in FIG. 12, a button hole (hereinafter referred to as an "eyelet hole P") formed of a droplet-shaped hole Q and a straight cut groove R continuous thereto is formed in the object to be sealed. The eyelet hole cutting sewing machine which performs the eyelet hole cutting seam M around the eyelet hole P is known. The eyelet hole cutting seam M has an eyelet part T which is formed in a radial shape around the hole Q and a side sewing part which is carried out to the left and right of the cutout groove R successively to the eyelet part T ( S1, S2). The eyelet hole P is opened by the thread cutting blade.

13 shows an example of a pattern data table in a conventional eyelet hole sewing machine. Here, nine types of pattern data can be stored, and one pattern data has data items of 1 to 7.

Data item 1 sets the shape of the hole Q of the eyelet hole P. FIG. As shown in Fig. 12C, the size of the hole Q is defined by the width width ew and the length length el, and the combination of these ew and el is previously stored as a table as shown in Fig. 12B. . Data item 1 requires you to select a number from this column (1 to 5).

Data items 2 to 6 are data relating to the number and length of the needles of the parts constituting the eyelet seam seam M shown in Fig. 12A. That is, the data item 2 is the hole cutting length (m1 in FIG. 12), the data item 3 is the number of side sewing needles (ln in FIG. 12), the data item 4 is the number of eyelet needles (en in FIG. 12), and the data. Item 5 is the side sewing messpace (ls in FIG. 12), and data item 6 is the eyelet messpace (es in FIG. 12). Data item 7 is a "sun scalpel" which forms the eyelet hole P by the cloth cutting scalpel before sewing, and the "humes" which forms the eyelet hole P by the cloth cutting scalpel after sewing. Is to choose one.

The eyelet hole cutting seam M is preferable as a sewn product when the left and right side sewing portions S1 and S2 are substantially nearly line-symmetrical with respect to the straight cut groove R as shown in Fig. 14 (a). .

However, one example is shown in Fig. 14 (b) due to the nonuniformity of the state of attachment of the cloth cutting blade, the difference in the thickness of the material (sewn) from the right and left of the cutout groove R of the eyelet hole P, and the sewing shrinkage after the sewing is performed. As shown in the drawing, the left and right side sewing portions S1 and S2 are shifted to the left side with respect to the incision groove R, and may not be sewn evenly with respect to the incision groove R. In this case, in the conventional button hole sewing machine, there is no means for equalizing the right and left sides of the cutting groove R, thereby deteriorating the appearance of the eyelet hole cutting seam M.

An object of the present invention is to improve the appearance of the buttonhole thread sewing machine in the buttonhole thread sewing machine to form a buttonhole thread sewing with higher quality.

1 is a view showing a buttonhole tightening sewing machine 100 of the embodiment to which the present invention is applied.

FIG. 2 is a block diagram showing a control configuration of the button hole tightening sewing machine 100 of FIG.

3 is a diagram showing an example of pattern data stored in the RAM 3;

4 is a diagram for explaining creation of seam data in the CPU 1. FIG.

Fig. 5 is a diagram for explaining creation of seam data between A-C and D-F.

6 is a front view of the operation panel 5;

7 is a diagram showing an example of a data table stored in the RAM 3;

8 is a flowchart of button hole cutting in the sewing machine 100.

FIG. 9 is a diagram showing a state where eyelet hole cutting seams M are applied to stepped fabric Y. FIG.

10 is a diagram showing a second example of pattern data;

11 is a diagram showing a third example of pattern data;

Fig. 12 is a diagram showing an eyelet hole knitting seam M implemented by a conventional buttonhole sewing machine.

Fig. 13 is a diagram showing conventional pattern data.

Fig. 14 is a view for explaining the eyelet hole cutting seam M, which is performed by a conventional button hole sewing machine and the right and left sides of the incision groove R are uneven.

※ Explanation of symbols about main part of drawing ※

1: CPU (control means) 2B: movable blade (part of hole opening means)

3: RAM (memory means) 5: Operation panel (change means)

16: cloth cutting pulse motor (part of hole-opening means)

100: buttonhole sewing machine

M: eyelet hole seam (bottom hole seam)

S1: Side Sewing Part S2: Side Sewing Part

In order to solve the above problems, the invention of claim 1 is, for example, as shown in Figs.

A hole-opening means for opening a button hole (for example, eyelet hole P) with respect to the object to be sewn;

Control data (e.g., pattern data) for forming buttonhole seam seams (e.g., eyelet hole seam M) having at least left and right side sewing portions S1 and S2 around the buttonholes. Storage means (e.g. RAM 3) for storing the

A buttonhole thread sewing machine comprising control means (for example, CPU 1) for forming the buttonhole threading seam based on needle drop position data (for example, seam data) created based on the control data ( 100),

The control data is messpace data for setting the distance between one side of the left and right side sewing portions and the button hole to a value different from the distance between the other side of the left and right side sewing portions and the button hole (e.g. Scalpel correction value "(1c)),

The control means is characterized by forming a seam around the buttonhole based on the messpace data.

Here, the "control data" is composed of length data and needle number data of each part necessary for sewing the buttonhole sewing, and this determines the shape and size of the buttonhole sewing.

According to the invention of claim 1, by setting the messpace data as desired, the distance between the buttonhole and the left and right side sewing portions can be adjusted, and the buttonhole sewing can be performed with a good appearance and high quality.

Accordingly, the messpace data can be generated even if sewing shrinkage occurs after the sewing is performed, except when the position where the opening means opens the button hole is not uniform, or when the thickness of the material is different at the portions where the left and right side sewing parts are applied. By setting freely, the buttonhole sewing is performed by equally adjusting the left and right sides.

According to a second aspect of the present invention, in the button-hole sewing machine according to the first aspect, for example, as shown in FIG. 6, a change means (for example, an operation panel 5) for changing the contents of the messpace data is provided. It is characterized by.

According to the invention of claim 2, the same effects as those of claim 1 can be obtained, and the messpace data can be easily changed to a desired value by the changing means, thereby making it very easy to change from one sewing condition setting to another. .

Embodiments of the present invention will be described in detail with reference to the following drawings.

As an example of the present invention, the buttonhole cutting sewing machine (next sewing machine) 100 forms eyelet holes as buttonholes by automatic control and simultaneously sewing eyelet holes around the eyelet holes.

As shown in FIG. 1, the sewing machine 100 is arranged to extend forward from the follower 22 and the follower 22 disposed at the rear of the bed 21, forming a substantially rectangular box shape. The sewing machine main body 24 having the arm part 23 which has the arm part 23, and the sewing machine table (not shown) in which the sewing machine main body 24 is placed are mainly comprised. The sewing machine 100 further includes an operation panel 5 (see FIG. 6) for the operator to make various settings, and a control circuit 110 (see FIG. 2) for controlling a series of sewing operations of the sewing machine 100. Equipped.

Although not shown in detail, the upper shaft extends in the front-rear direction in the arm portion 23 and is disposed. On the other hand, the lower shaft extends in the front-rear direction in the bed portion 21 is disposed. The servomotor 7 (refer FIG. 2) is connected to the lower axis. The lower shaft is connected to the upper shaft through a transmission mechanism provided with a timing belt. The rotational force of the lower shaft rotated by the servomotor 7 is transmitted through the transmission mechanism so that the upper shaft rotates.

The needle bar 26 extending downward from the distal end of the arm 23 and having the sewing needle 25 at the lower end of the needle bar 26 is capable of vibrating the needle and the left and right by vibrating the needle shaft by the needle rod drive mechanism and the needle vibration mechanism connected to the upper shaft. Is placed.

The bed portion 21 has a looper base 28 having a looper portion 27 having a looper portion (not shown) having a looper (not shown) and a spreader (not shown) to assist the looper, facing the needle bar 26. do. The looper and the spreader are connected to the lower shaft through the looper driving mechanism and the spreader driving mechanism.

The needle bar 26 and the looper base 28 are connected to a rotating mechanism having a Z-axis pulse motor 13 (see Fig. 2) and a timing belt, and the needle bar 26 and the looper base 28 are vertically synchronized with each other. Rotate shaft rotation. This is a mechanism for making the seam radially when sewing the periphery of the droplet-shaped hole Q in the eyelet hole P.

On the upper surface of the bed portion 21, a conveyance table 29 on which an object to be sealed (not shown) is set is disposed. On the upper surface of the conveyance table 29, a pair of cloth pressing portions 2A (shown in the state shown in FIG. 1) for pressing the object to be processed are arranged. The transfer table 29 is an X-direction (in FIG. 1) under the control of the CPU 1 by a transfer mechanism composed of an X-axis pulse motor 9 and a Y-axis pulse motor 11 arranged in the bed portion 21. Is moved horizontally in the direction perpendicular to the plane of the plane) and in the Y-direction (rear direction shown in Fig. 1) (see Fig. 2).

The sewing machine 100 has a scalpel mechanism for opening the eyelet hole P in the object to be sewn. The scalpel mechanism is a cloth cutting pulse for moving the fixed scalpel (not shown) disposed in the bed portion 21 and the scalpel 2B above the scalpel 2B disposed above the fixed scalpel. A scalpel drive mechanism having a motor 16 (see Fig. 2) is mainly composed. When the cloth cutting pulse motor 16 is driven to lower the measuring stand 2B toward the fixed knife, the sewing material set between the measuring stand 2B and the fixed knife is cut to open the eyelet hole P. do.

Next, a control configuration of the sewing machine 100 will be described with reference to FIG. 2.

2 shows a control circuit 110 of the sewing machine 100. The control circuit 110 is composed of a CPU 1, a ROM 2, a RAM 3 and an interface 4a, 4b, 4c, ..., various drive circuits, an operation panel 5, a start switch 15, and the like. do.

In the ROM (read only memory) 2, a control program and control data for executing the eyelet hole cutting seam M are written.

RAM (random access memory), which is a storage means of the present invention, stores a plurality of pattern data (control data) and at the same time stores one pattern data selected through the operation panel 5 and stores the data items in the pattern data. If the value is changed, the value is also stored. The RAM 3 also functions as a memory area temporarily used at the time of processing during sewing. It also stores seam data (needle drop position data, described later) generated from the pattern data.

An example of pattern data stored in the RAM 3 is shown in FIG. 3. Nine pattern data are stored in the RAM 3, and specific values are set in the pattern data corresponding to data items 1 to 8 like pattern No. 1. Data items 1 to 5 and 7, 8 are the same as the conventional pattern data shown in FIG. That is, the shape and size of the eyelet hole seam M are determined by the data items 1 to 5 and 7. FIG. In particular, data item 5 sets the "side sewing part space" (ls) which is a reference value of the gap between the straight cut groove R of the eyelet hole (button hole) P and the side sewing parts S1 and S2. (See FIG. 4). For data item 8, a sun knife or a hume girl is selected.

Data item 6 sets a "left mes space correction value" (lc, mes space data), which is a correction value for correcting the gap ls between the cutout groove R and the side sewing portion S1 (see Fig. 4). The "left scalpel correction value" lc is added to the "side sewing part scalpel" ls and corrects the gap between the left side sewing part S1 and the cutout groove R. FIG. Accordingly, the distance between the side sewing portion S1 and the cutout groove R and the distance between the side sewing portion S2 and the cutout groove R are set to different values. Therefore, by setting the "left scalpel space correction value" lc to a predetermined value, the buttonhole cutting seam M in which the right and left sides of the incision grooves R are equally aligned is performed.

The length of the left mes space correction value lc is not necessarily set to set the length itself. If the seam data to be described later can be determined, the ratio of the side seam mes space Ls may be set. .

The CPU (Central Processing Unit) 1 is a control means of the present invention for controlling a series of processes related to eyelet hole sewing in accordance with the control program and control data of the ROM 2.

The CPU 1 is connected to the operation panel 5 via the interface 4f, controls the display on the operation panel 5 and receives input signals input through the operation panel 5 to select and select various settings. Changes are to be made. The operator can select the pattern data shown in FIG. 3 through the operation panel 5 or change the number of each data item of the selected pattern data. The operation panel 5 will be described later.

In addition, the CPU 1 has a servo motor driving circuit 6, an X-axis pulse motor driving circuit 8, and a Y-axis pulse motor driving circuit 10 via interfaces 4a, 4b, 4c, 4d, 4e, and 4f. ), The Z-axis pulse motor driving circuit 12, the cloth cutting pulse motor driving circuit 14, and the start switch 15 are connected.

The servomotor drive circuit 6 drives the servomotor 7 under the control of the CPU 1. The X-axis pulse motor driving circuit 8 drives the X-axis pulse motor 9 which moves the feed table 29 in the X direction (described above) under the control of the CPU 1. The Y-axis pulse motor driving circuit 10 drives the Y-axis pulse motor 11 which moves the feed table 29 in the Y direction (described above) under the control of the CPU 1. The Z-axis pulse motor driving circuit 12 drives the Z-axis pulse motor 13 under the control of the CPU 1. The cloth cutting pulse motor driving circuit 14 drives the cloth cutting pulse motor 16 under the control of the CPU 1. The start switch 15 outputs a start signal for carrying out buttonhole sewing, cloth cutting processing, and the like, under the control of the CPU 1.

As shown in Fig. 6, the operation panel 5, which is a changing means in the present invention, mainly comprises a preparation switch P13, a pattern number selector 5a, a scalpel operation display 5b, a data item selector 5c, and a data value set. 5d and the data setting switch P6.

The pattern number selection section 5a is for selecting a pattern number, and the pattern number currently selected is displayed on the pattern display section P1 ("1" in Fig. 6). By changing the numbers one by one within the range of 1 to 9 by the + key P2 and-key P3 under the pattern display section P1, different pattern data can be selected.

The data item selector 5c selects data items in the pattern data selected by the pattern number selector 5a. The data item currently selected is displayed on the item display part P10 ("6" in FIG. 5). Other data items can be selected by changing the numbers one by one within the range of 1 to 8 by the + key P11 and-key P12 below the item display section P10.

When a data item is selected in the data item selection unit 5c, a number set in advance for the data item is displayed on the value display unit P7 of the data value setting unit 5d. The value can be changed by increasing or decreasing the number of the value display unit P7 within a predetermined range by a + key P8 and a-key P9 below the value display unit P7.

In addition, the scalpel indicator P4 and the rear blade indicator P5 made of LEDs (light emitting diodes) are arranged on the scalpel operation display section 5b. In the data item selection section 5c, the number 8 is selected as the data item, and when the data value setting section 5d selects "1" representing the sunmem or "2" representing the humese, One of the measuring lamp P4 and the measuring knife P5 lights up. 6 shows a state in which the sun knife is selected.

In addition, in the value display section P7 of the data value setting section 5d, "-0.2" and a negative value are displayed corresponding to "left scalpel correction value" 1c of the data item "6". This is to narrow the distance between the side sewing portion (S1) and the cutting groove (R) by 0.2 mm, for example, to perform a uniform cutting from the left and right of the cutting groove (R).

The data setting switch P6 is a switch to operate when performing data setting work. In other words, when the data setting switch P6 is pressed, it is possible to change the data value or the like. The selection or change of each item or number is determined by pressing the data setting switch P6 again.

The preparation switch P13 is a switch for creating seam data corresponding to a data value selected or changed after completion of the setting operation.

Fig. 8A shows the general flow of sewing of buttonhole cutting by the sewing machine 100. Figs. In addition, in the following description, it is assumed that the eyelet hole cutting seam M rubs to the right with respect to the incision groove R in the state which is not correct | amended. That is, as shown in Fig. 4, the left mes space correction value lc is set so that the left and right sides of the cutout groove R are equally matched by increasing the distance between the side sewing portion S1 and the cutout groove R.

This general flow starts, for example, when the main power supply (not shown) of the sewing machine 100 is turned ON. First, in step A1, the + key (P2) and the-key (P3) of the pattern number selection section 5a. ) Is processed to determine whether the number of the pattern data has changed, and if so, the pattern number is updated in step A2, and the process proceeds to step A3. If it is determined in step A1 that the change has not been made, the process proceeds directly to step A3.

In step A3, it is determined whether or not the data setting switch P6 has been operated. If the operation is performed, the data setting mode is entered, and data setting processing is performed in step A4. This data setting process will be described later. After step A4 or when it is determined in step A3 that the data setting switch P6 has not been operated, the process proceeds to step A5.

In step A5, it is determined whether the preparation switch P13 has been operated. If not, the process returns to step A1, and if operated, the seam data is created by the CPU 1 in step A6.

Next, an example of creating seam data will be described with reference to FIGS. 4 and 5.

As shown in Fig. 4, the needle drop positions (X coordinates, Y coordinates, and Z-rotation amount) calculated for performing a seam shape (shown by broken lines) with respect to the previously registered scalpel shape (shown by solid lines) are determined. In the present embodiment, the seam data determines the X movement amount determined from the difference in the X coordinates of each needle dropping point, the Y movement amount determined from the difference in the Y coordinates of each needle dropping point, and the Z turning amount.

In addition, in FIG. 4, in order to simplify the figure, the inner needle drop position with respect to the eyelet hole P is shown by the black round black dot "●", and the outer needle drop position is shown by the round white dot "○" only a part. do.

In addition, the point ○ is the origin position of the XY coordinate, the point A is the point of view of the side sewing portion S2, and the point B is the point on the right side of the boundary between the droplet-shaped hole Q and the straight cut groove R. The point C is the end point of the side sewing part S2 and is the start point of the eyelet part T, and the point D is the end point of the eyelet part T, and is the start point of the side sewing part S1, and the point E Is a point on the left side of the boundary between the droplet-shaped hole Q and the straight cut groove R, and the point F is the end point of the side sewing portion S1.

In point A to point C, the Y coordinate of each needle drop point (the position in the Y axis direction from the origin O) indicates the total amount of movement in the Y axis direction from the point A to the point C by the number of side sewing needles 1n. It is calculated by dividing evenly. The X coordinate (position in the X axis direction from the origin O) from the point A to the point C is calculated for the calculated Y coordinate. By calculating the difference between the X coordinates and the Y coordinates of the respective needle dropping points, the X moving amount and the Y moving amount at each needle dropping point are calculated. In addition, since the X coordinates are the same from point A to point B, the X moving amount is zero.

Here, to calculate the X coordinate of each needle drop point from point B to point C, it is assumed that the seam path (shown in broken lines) from point B to point C is as follows. That is, first, the contact point where the circle | round | yen which contact | connects the circle | round | yen which has C-D as diameter and the point B passing through is determined. And it is assumed that the path | route of the seam from the point B to the point C consists of a straight line from the point B to the said contact point, and an arc from the said contact point to the point C among the circles whose diameter is between C-D. The X coordinate corresponding to the Y coordinate on the route thus obtained is calculated. The amount of Z-rays from point A to point C is zero.

Further, from the origin 0 to the point A, a ball feed that moves only the feed table 29 without operating the sewing machine 100 is performed. The X moving amount is ls, the Y moving amount is (L-ml), and the Z turning amount is zero.

From point C to point D, the circumference having a diameter between C and D is equally divided by the number of needles in the eyelet portion (en) to calculate the X moving amount, Y moving amount and Z turning amount, respectively.

Similarly from point A to point C, the Y coordinate of each needle drop point is equally divided by the number of needles (ln) in the Y-axis direction from point D to point F. Is calculated. The X coordinates from the point D to the point F are calculated for the calculated Y coordinates, and the X movement amount and Y movement amount of each needle falling point are calculated from the calculated coordinates. In addition, to calculate the X coordinate from point D to point E, first define the contact point where the circle between CD and the straight line passing through point E contact each other, and define the seam path (shown by broken line) from point D to point E. Assume that it consists of a straight line from point E to the contact point and an arc from the contact point to point D in a circle having a diameter between CDs. The X coordinate corresponding to the Y coordinate on the route thus obtained is calculated.

In the side sewing part S1 from the point E to the point F, the X moving amount is corrected on the basis of the "left scalpel space correction value" lc at the point E serving as a viewpoint. In the present embodiment, the correction is made by adding the left mess space correction value lc to the side seams mes space Ls as a reference. The amount of Z-rays from point D to point F is zero.

And from the point F to the origin O is a ball feed to move only the feed table 29 without operating the sewing machine 100, X moving amount (-ls-lc), Y moving amount (-L + ml), Z turning amount Is -180 °.

[Calculation of X Movement Amount and Y Movement Amount Between A-C and D-F]

As shown in Fig. 5, the X moving amount and the Y moving amount in the side sewing portions S1 and S2 (between A-C and D-F) can be more specifically calculated as follows. In addition, in FIG. 5, the origin is made into the center of the hole Q of the eyelet hole P for simplicity.

A path connecting the position of the needle drop (inner needle) on the inner contour of the buttonhole cutting as shown in FIG. 5 (b) with respect to a scalpel shape (shown in solid line) previously registered as shown in FIG. 5 (a). Determine.

A circular arc G'C'D'H 'having a hole Q (the width ew, the vertical width el) of the eyelet hole P as the diameter C' and -D 'as shown in Fig. 5A, and Assume that it is determined from the straight line B'G 'and the straight line E'H' which become a tangent to the said circle. Let er be the radius of the circle as the origin. The coordinates of each point defining the scalpel shape are A '(0, -la), B' (0, -ey), C '(er, 0), D' (-er, 0), E '(0,- ey) and F '(0, -la). Let coordinates of a contact be G '(x ₁ , y ₁ ) and H' (x ₁ , y ₁ ). In addition, the same point is distinguished as A 'and F', and B 'and E' for the convenience of correct | amending the left and right messpace.

In addition, er, ey, and la are shown as follows using the dimension of the hole Q (width width ew, vertical width el), and hole cutting length m1.

er = ew / 2

ey = el-ew / 2

la = ml-ew / 2

Assume that the path for binding the inner needle position as shown in Fig. 5 (b) is determined from a circular arc GCDH of a circle whose CD is a diameter, a straight line BG and a straight line EH that are tangent to the circle, and a straight line AB and a straight line FE. .

Let 'eslet messpace' be es, 'side sewing part mes space' ls, and 'left mes space correction value' lc. The coordinates of each point are A (ls, -la), B (ls, -ey), C (er + es, 0), D (-er-es, 0), E (-ls-lc, -ey) , F (-ls-lc, -la). The coordinates of the contact point are G (x ₁ ', y ₁ ') and H (x ₂ ', y ₂ ').

(Coordinates of contact G 'and contact H')

In Fig. 5 (a), the tangent B'G 'is given by x ₁ x + y ₁ y = er ² , and the contact G' is on a circle having a diameter C'-D 'as x ₁ ^2. + y ₁ ² = er ² is obtained. From these equations, the coordinates of the contact G '(x ₁ , y ₁ ) are determined as follows. x ₁ = er (1-er ² / ey ² ) ^1/2

y ₁ = -er ² / ey

Similarly, the tangent E'H 'is given by x ₂ x + y ₂ y = er ² , and from x ₂ ² + y ₂ ² = er ² the coordinates of contact H' (x ₂ , y ₂ ) are It is decided together.

x ₂ = -er (1-er ² / ey ² ) ^1/2

y ₂ = -er ² / ey

(Coordinate of inner needle position between A and C)

The number of side sewing part needles is 1 n. The coordinates of the inner needle position (x _k , y _k ) from the point A to the kth (k = 0 to ln-1) are determined as follows. First, Y-coordinate y _k is computed by equally dividing AC between the number of side sewing part needles ln.

y _k = -la + la (k / ln) where k = 0 to ln-1

For the calculated Y coordinate y _k , the X coordinate x _k is determined as follows.

(1) When on straight line AB (ie when y _k ≤ -ey)

x _k = ls

(2) When on tangent BG (i.e. when y _k ≤ y ₁ )

x _k = (x ₁ + es-ls) / (y ₁ + ey) · (y _k + ey) + ls

This equation uses the Y coordinate y ₁ of the point G 'calculated above as the coordinate y' of the point G, and the eyelet scalpel at the X coordinate x ₁ of the point G 'calculated above as the X coordinate x' of the point G. It is an approximation equation that simplifies the calculation using the value of space es. That is, the coordinates of x _k are obtained as y ₁ '= y ₁ , x ₁ ' = x ₁ + es.

(3) When it is circle shape with diameter between CDs (that is, when y _k > y ₁ )

x _k = ((er + es) ² -y _k ² ) ^1/2

The X shift amount and the Y shift amount are determined by calculating the difference between the coordinates of the calculated eye position (x _k , y _k ).

(Coordinates of Inner Needle Position between D-F)

The coordinates of the inner needle position (x _k , y _k ) of the _kth (k = 0 to ln-1) from the point D are determined as follows. First, Y-coordinate y _k is computed by equally dividing DF between DF of side sewing parts.

y _k = -1a + la · ((ln-1-k) / ln) However, X coordinate x _k is determined as follows for Y coordinate y _k calculated from ln-1 at k = 0.

(1) When it is circle shape with diameter between CDs (that is, when y _k > y ₁ )

x _k =-((er + es) ² -y _k ² ) ^1/2

(2) On tangential HE phase (ie when y _k ≤ y ₁ )

x _k = (x ₂ -es-ls-lc) / (y ₂ + ey) (y _k + ey) -ls-lc

Similar to the case of obtaining the X-coordinate of the needle position between the esophagus AC, the coordinate of the point H is approximated by y ₂ '= y ₂ , x ₂ ' = x ₂ -es.

(3) On the straight line EF (ie when y _k ≤-ey)

x _k = -ls-lc

The difference between the coordinates of the calculated eye position (x _k , y _k ) is obtained to determine the amount of X movement and Y movement.

As described above, the X moving amount, Y moving amount and Z rotating amount between the needle drop points are determined, and the data table N stored as X moving amount, Y moving amount and Z rotating amount is stored in the RAM 3 as shown in FIG. do.

7 shows the seam data when the needle is vibrated from the inner needle to the needle drop (outer needle) on the outer contour of the buttonhole cutout. In other words, in the present embodiment, the feed table 29 is moved while moving from the inner needle to the outer needle, and the needle is vibrated. The feeder 29 may be moved while the other needle reaches the inner needle, or may be appropriately distributed to both the inner needle from the inner needle and the inner needle to the inner needle.

Subsequently, in step A7, the feed table 29 is moved to the home position, and the needle bar 26 and the looper are also moved to the home position in the Z-axis rotation.

Next, in step A8, it is monitored whether the start switch 15 is in the ON state, and when it is turned on, the process proceeds to step A9. In step A9, it is determined whether the sun blade is selected in the data item " 8 " in the pattern data. In the case of the sun scalpel, the scalpel base is driven by the cloth cutting pulse motor 16 in step A10 to carry out a scalpel driving process. If it is determined after step A10 or not in step A9 that it is not a sun knife, the process proceeds to step A11 where a process of moving the feed table 29 to the sewing start position is performed.

Subsequently, a hole cutting operation is performed in step A12.

Based on the data table N (see Fig. 7) in which the X moving amount from the point E to the point F is corrected by the left mes space correction value (lc), the sewing machine 100 is configured to remove the eyelet hole cutting seam M. And the right and left sides of the incision groove (R) is equally matched to form a good button hole.

Referring to the example based on FIG. 4 with respect to the EF, the inner needle is dropped to the point D1, the needle vibrates, and the outer needle falls to a position not shown, and the sewing needle 25 ) Falls. In the state without correction, the sewing needle 25 falls on the path passing through the point E1 (indicated by Δ) indicated by the two-dot chain line, and the distance L0 between the side sewing portion S1 and the incision groove R. ) Is narrower than the distance between the side sewing portion S2 and the cutout groove R (ie, ls). In this embodiment, the movement amount of the conveyance table 29 is correct | amended based on "left scalpel space correction value" lc, and the position after correction shown by the point E (shown by "(circle)") is set as an inner needle position. Thereafter, the sewing needle 25 is vibrated between the inner needles (E2 to E8) and the outer needle in the same X coordinate state to repeat the same sewing, and the sewing of the side sewing portion S1 reaches the inner needle shown at the point F. To complete. As a result, the right and left sides of the incision grooves R are equally aligned, and the eyelet hole cutting seam M having a good appearance and high quality is performed.

After sewing the predetermined number of needles, the process proceeds to Step A13 where the feed table, the needle bar 26, and the looper are moved to the origin position in the same manner as in Step A7.

Subsequently, in step A14, it is determined whether the postmese is selected from data item "8" in the pattern data. If the postmese is selected, the routine advances to step A15 to carry out a mass drive process. If it is determined after step A15 or not in step A14 that it is not a postmese, the process returns to step A8 to resume the operation of the start switch 15 again, and when the start switch 15 is pressed, the hole breaking operation is repeated. Can be.

8B shows a flowchart of the data setting process of step A4. First, the display of the item display part P10 on the operation panel 5 is set to "1" in step B1, and the value of the eyelet hole shapes 1-5 currently set on the value display part P7 is displayed. Subsequently, in step B2, it is determined whether or not the data item number has been changed by the + key P11 and-key P12. If the data item number is changed, the data item number is updated in step B3, and the item display part P10 and the value display part P7 are changed. Change the display of). After step B3 or when it is determined in step B2 that the data item number has not been changed, the process proceeds to step B4.

In step B4, it is determined whether the value (value displayed on the value display section P7) of the currently selected data item has been changed by the + key P8 and the-key P9, and if not changed, the flow proceeds to step B6. If the value has been changed, the data value is updated in accordance with the data item selected in step B5 to change the display content of the value display section P7, and the process proceeds to step B6.

In step B6, it is determined whether the data setting switch P6 has been operated, and if it is operated, the updated data value is updated in step B7, and the flow returns to step A5. If it is determined in step B6 that the data setting switch P6 has not been operated, the process returns to step B2.

According to the sewing machine 100 of the embodiment of the present invention described above by setting the "left scalpel space correction value" (1c) as desired, the right and left sides of the incision groove (R) are equally matched, and the appearance is good and high-quality eyelet hole seam (M) is carried out.

Accordingly, if the position where the scalpel mechanism opens the eyelet hole P is not uniform, the left mes space correction value (lc) is set freely even when sewing shrinkage or the like after thread sewing is performed. Right and left are evenly aligned.

In addition, the left mes space correction value lc is set so that the right and left sides of the incision grooves R are equally aligned, so that the eyelet cutting seam M having a good appearance can be applied to the stepped fabric.

As shown in Fig. 9 (a), the eyelet-cutting seam M is applied to the stepped fabric Y (seam material) having a different thickness from right and left of the straight cut groove R of the eyelet hole P. As shown in FIG. 9B, the thickness W1 on the right side of the cutting groove R is thicker than the thickness W2 on the left side of the cutting groove R, and a step is attached to the left and right sides of the cutting groove R. FIG. 9B is a cross-sectional view of the eyelet hole cutting seam M as seen in the direction AA ′ (shown in FIG. 9A).

As shown in Fig. 9 (b), the sewing thread X, which is cut off from the thick side of the stepped fabric Y, is inclined near the incision groove R, and the length b along this inclined is stepped fabric Y. It may become longer than the length (a) cut off on the thin side of. In addition, because it is inclined, it is seen to go inward, and once seen, the oscillation width of the side sewing portion S2 is longer, so that the eyelet hole cutting seam M having a good appearance may not be obtained. However, in the sewing machine 100 of the present embodiment, the left mes space correction value lc is set to a predetermined value so that the left and right sides of the cut grooves R are equally matched even in the step cloth Y.

As shown in FIG. 9 (c), the descending sewing needle 25 may interfere with the end of the cutting groove R unless a sufficient messpace is secured between the cutting groove R. In particular, when interfering with the thick side of the step cloth (Y), the sewing needle 25 may be bent in the downward direction, which may lead to problems such as bending of the needle and splashing of the seam. However, in the sewing machine 100 of the present embodiment, by setting the "left scalpel space correction value" (lc) to a predetermined value, it is possible to prevent the interference between the sewing needle 25 and the end of the cutting groove R, so that the needle is bent, the seam 튐 Problems such as the above can be reliably prevented.

In addition, this invention is not limited to the said Example, It can change suitably.

For example, the pattern data stored in the RAM 3 is not limited to the contents shown in FIG. 3 but may be illustrated in FIG. 10 or 11.

The pattern data shown in FIG. 10 is a data item "6", which is a "side sewing part right messpace correction value which is a correction value of the gap ls between the cutout groove R of the eyelet hole (button hole) and the side sewing part S2. And the right and left sides of the incision groove R are equally aligned. In this case, "side sewing part right messpace correction value" becomes messpace data.

As shown in Fig. 11, the data item " 5 " is set to " side sewing portion right messpace " which is a gap between the cutout groove R of the eyelet hole (button hole) and the side sewing portion S2. As a side, the "side sewing part left messpace" used as a gap between the cut groove R and the side sewing part S1 is set. Accordingly, the gap between the left and right side sewing portions S1 and S2 and the cutting groove R can be set independently, and the left and right sides of the cutting groove R are equally matched. In this case, "side sewing part right messpace" and "side sewing part left messpace" are the messpace data.

Although RAM 3 is used as a storage means for storing pattern data, an external storage medium such as EEPROM (Electric Erasable Programmable Read Only Memory) or a floppy disk may be used.

The number of pattern data, the number of data items, the operation method in an operation panel, etc. can be changed suitably.

Further, in the above embodiment, a plurality of pattern data are stored and one of them is selected to create seam data, but a plurality of seam data may be stored in the storage means. Alternatively, a plurality of pattern data and seam data corresponding to each pattern data may be stored. In that case, select the pattern data to automatically specify the seam data.

The shape of the button hole may be not only the eyelet hole P but also other shapes.

In addition, of course, a specific detailed structure etc. can be changed suitably in the range which does not deviate from the meaning of this invention.

According to the invention of claim 1, by setting the messpace data as desired, the distance between the buttonhole and the left and right side sewing portions can be adjusted, and the buttonhole sewing can be performed with a good appearance and high quality.

According to the invention of claim 2, the same effects as in claim 1 can be obtained, and the change from one setting of sewing conditions to another is extremely easy.

Claims (2)

A hole-opening means for opening a buttonhole with respect to the sewing object, Storage means for storing control data for forming a buttonhole knitting seam having at least left and right side sewing portions around the buttonhole; In the buttonhole thread sewing machine comprising a control means for forming the buttonhole thread seam based on the needle drop position data created based on the control data, The control data includes messpace data for setting the distance between one side of the left and right side sewing portions and the button hole to a value different from the distance between the other side of the left and right side sewing portions and the button hole, And the control means forms a seam around the buttonhole on the basis of the messpace data. The method of claim 1, And a changing means for changing the contents of said mass space data.