JP2003079981A - Buttonhole sewing machine - Google Patents

Abstract

(57) [Summary] [Problem] An object is to make joints between bar-tacking stitching portions and side stitching portions uniform, and to enable formation of overlock stitches of various shapes. In a buttonhole overlock sewing machine according to the present invention, when a width correction rate for a distance from a center line 201 of a buttonhole 200 to a needle drop point is input from an operation panel, a control device performs the following based on the width correction rate. For each needle drop point to the right of the center line 201, the distance from the center line 201 to each needle drop point is corrected, and a new needle drop point is calculated. Then, the controller feeds the cloth according to the new needle drop point,
By controlling the needle swinging mechanism and the like, the hole stitching seam 208 is formed on the cloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole overstitch forming a buttonhole seam consisting of side stitches arranged on the left and right of the buttonhole and bartack stitches arranged before and after the buttonhole. Regarding sewing machine.

[0002]

2. Description of the Related Art A buttonhole stitch sewing machine is known in which a buttonhole is formed in a material to be sewn and a hole stitch is formed around the buttonhole. As shown in FIG. 15 (a), the overlock stitches include side seams 301 and 301 formed on the left and right of the button hole 300 and bar tacking seams 302 and 302 formed before and after the button hole 300. Consists of.

A buttonhole overlock sewing machine is designed to perform sewing by entwining an upper thread passed through a sewing machine needle with a lower thread wound around a bobbin in a shuttle device. This buttonhole sewing machine lowers the knife to the cloth and pushes the buttonhole 3
Before or after forming 00, the sewing machine needle is moved up and down and the cloth is fed to the front and back direction by the cloth feeding mechanism while swinging to the left and right. As a result, the buttonhole overlock sewing machine forms the side sewn portions 301 along the left and right sides of the button hole 300, and forms the bartacking sewn portions 302 in front of and behind the button hole 300 continuously to the side sewn portions 301.

As the above-described buttonhole stitch sewing machine is becoming electronic, the respective mechanisms of the buttonhole stitch sewing machine are controlled by the controller to form the buttonhole stitches. As an electronic sewing machine for buttonhole stitching, there is a sewing machine described in Japanese Patent Application Laid-Open No. 2000-312785. In this buttonhole sewing machine, the widths of the left and right side stitch portions 301, 301 can be made different, and the left and right side stitch portions 301, 301 are formed with the set widths. As the setting method, the width of the right or left side sewing portion and the ratio of the width of the left side sewing portion 301 to the width of the right side sewing portion 301 are input to the buttonhole overlock sewing machine,
The buttonhole stitch sewing machine sets the widths of the left and right side stitch portions 301, 301 separately based on the ratio and the width.
Furthermore, in this buttonhole sewing machine, the overall width of the left and right side seams 301, 301 and the bar tacking seam 30
The width of 2,302 can be set separately.

[0005]

However, Japanese Patent Laid-Open No. 2000-2000
In the sewing machine described in Japanese Patent Publication No.-312785, the widths of the left and right side seams 301, 301 as a whole and the widths of the bartack stitches 302, 302 can be set separately, so that the side seams 301, 301 and the bar tacks can be set separately. The seams of the tie stitches 302 are discontinuous. For example, as shown in FIG. 15B, in terms of the right side of the center line 304 of the button hole 300, the right side edges of the bartack stitches 302, 302 are aligned with the right side edge of the right side stitch section 301. Not sewn, bar tacked seam 3
A step is formed at the joint between 02 and 302 and the right side stitch portion 301, and the joint becomes uneven.

Further, in the above sewing machine, the side stitch portions 301,
Since only the width of 301 and the width of the bartack stitching portions 302, 302 can be set, only a substantially rectangular shape can be formed as the whole overlock stitch. For example, a holed seam in which the right side edge of the right side seam 301 and the bartack stitches 302, 302 are inclined toward the stop line 304 from the front end to the rear end of the holed seam cannot be formed.

Therefore, the problem to be solved by the present invention is to make the joints between the bartack stitches and the side stitches uniform, and to enable the formation of holed stitches of various shapes. is there.

[0008]

In order to solve the above problems, the invention described in claim 1 is, for example, as shown in FIGS.
As shown in FIG. 4 and FIG. 13, the cloth-feeding means (for example, cloth-feeding device 52) that holds and feeds the material to be sewn and the needle (for example, sewing machine needle 9) are moved up and down to move the material to be sewn The sewing means (for example, the sewing machine motor 5, the elevating mechanism 50, the needle swinging mechanism 51, the hook device 12 and the interlocking mechanism 53) for forming the seam, and the cloth feeding means and the sewing means are controlled so that the button holes are moved to the left and right. Sewing control means (for example, control device 110) for forming overlock stitches including side stitches to be disposed and bar-tacking portions disposed before and after the button hole.
In a buttonhole stitch sewing machine including the above, input means for inputting a correction rate of the distance from the center line in the longitudinal direction of the buttonhole to the needle drop point of the buttonhole stitch (for example, control device 110: step S1). And, for each needle drop point to the left or right of the center line, a calculation unit that changes the distance from the center line based on the correction rate to calculate a new needle drop point (for example, the control device 110). : Step S4), and the sewing control means forms the overlock stitch based on the new needle drop point calculated by the calculation means.

The "distance from the center line in the longitudinal direction of the buttonhole to the needle drop point of the overlock stitch" is the line connecting the needle drop point to a certain point on the center line with respect to the center line. When it is vertical, it is the distance from the needle drop point to the point on the center line.

According to the first aspect of the present invention, the distance from the needle drop point to the left or right of the center line to the center line is calculated based on the correction rate of the distance from the center line of the button hole to the needle drop point. A new needle drop point is calculated by the change, and a holed stitch is formed at the new needle drop point. Therefore, if each needle drop point to the right of the center line is changed, the distance from the right side edge to the center line is adjusted for the bartack stitching area, and , The distance from the right side edge to the centerline is adjusted. On the other hand, when each needle drop point to the left of the center line is changed, the distance from the left side edge to the center line is adjusted in the bartack stitching part, and , The distance from the left side edge to the centerline is adjusted. In this way, the distances from the side edges of the bar-tacking stitches and side stitches to the center line are corrected and adjusted with the same correction rate, so that the joint between the bar-tacking stitches and the side stitches is continuous. Get together. Therefore, a well-formed holed seam is formed.

Further, when the needle drop points on the right side of the center line are changed, the distance from the left and right side edges to the center line is adjusted in the right side sewing portion. on the other hand,
If the needle entry points to the left of the center line are changed,
In the left side sewing portion, the distance from the left and right side edges to the center line is adjusted. For this reason, the width of the left or right side stitch is adjusted, and the shape of the overhole stitch is adjusted in left-right balance.

Further, since each needle drop point of the hole stitching stitch is calculated, the shape of the hole stitch stitch before change need not be rectangular, and the shape of the changed hole stitch stitch is also made rectangular. Not exclusively. Therefore, it is possible to form overlock stitches having various shapes.

According to a second aspect of the present invention, for example, as shown in FIG. 12, in the buttonhole overstitch sewing machine according to the first aspect, a changing means for changing the value of the correction factor (for example, the operation panel 100). It is characterized by including.

According to the second aspect of the present invention, the shape of the hole stitches is adjusted to various shapes by changing the correction rate.

According to a third aspect of the present invention, for example, as shown in FIGS. 1, 2, 3, 4, and 13, a cloth feeding means (for example, a cloth feeding device 52) for holding and sending a sewing object. When,
A sewing means (for example, a sewing machine motor 5, an elevating mechanism 50, a needle swinging mechanism 51, a hook device 12 and an interlocking mechanism 53) for forming a stitch on the workpiece by vertically moving a needle (for example, a sewing machine needle 9); A sewing control means for controlling the cloth feeding means and the sewing means to form overlock stitches including side stitching portions arranged on the left and right of the button hole and bar-tacking portions arranged before and after the button hole. (For example, the control device 11
0) and a buttonhole stitch sewing machine including
Within a given range along the longitudinal direction of the buttonhole, of the distance from the last needle drop point to the center line with respect to the correction rate of the distance from the frontmost needle drop point to the longitudinal centerline of the buttonhole. Input means for inputting the ratio of the correction factors (for example, control device 110: step S1), and for each needle drop point within the given range, from the frontmost needle drop point or the last needle drop point. Calculation means for calculating a new needle drop point by changing the distance from the center line based on a correction rate obtained by linearly interpolating the ratio by the distance along the longitudinal direction to each needle drop point (for example, , Control device 11
0: step S4), and the sewing control means,
It is characterized in that a holed stitch is formed based on the new needle drop point calculated by the calculation means.

According to the third aspect of the invention, the ratio of the correction rate of the distance from the last needle drop point to the center line of the button hole to the correction rate of the distance from the front needle drop point to the center line of the button hole. Is linearly interpolated by the distance from the frontmost needle drop point (or the last needle drop point) to each needle drop point. Then, based on the linearly interpolated ratio, a new needle drop point is calculated for each needle drop point within the given range by changing the distance from the center line. A holed seam is formed at the new needle drop point. Therefore, the distance from the center line is adjusted for each needle drop point within the given range.
In this way, the distance from the center line to each needle drop point is corrected based on the linearly interpolated ratio, and even if there is a seam between the bartack stitch and the side stitch in the given range, the The seams are continuous and aligned. Therefore, a well-formed holed seam is formed.

Further, since the ratio is linearly interpolated by the distance from the foremost needle drop point (or the last needle drop point), the correction rate of each needle drop point is along the length direction of the button hole. Change. Therefore, for example, even if the shape of the overhollowed seam before correction is rectangular, the shape of the overlaid seam that has been changed is not rectangular but trapezoidal, for example. In other words, since the distance between each needle drop point is changed based on the linearly interpolated ratio, even if the right edge or left edge of the pre-corrected overlock stitch is parallel to the center line, it is changed. The right side edge or the left side edge of the holed seam formed as a result is inclined with respect to the center line. Therefore, it is possible to form overlock stitches having various shapes.

The ratio may be input separately for each needle drop point to the left of the center line and each needle drop point to the right of the center line. In this case, the left and right balance of the shape of the holed seam is adjusted.

According to a fourth aspect of the present invention, in the buttonhole stitch sewing machine according to the third aspect, the given range is substantially equal to the length of the buttonhole stitch, and each needle drop point within the given range is a hole. It is characterized in that it is all the needle drop points of the overlock seam.

According to the fourth aspect of the invention, the distance from the center line is adjusted for all the needle drop points of the overlock stitch. Therefore, the shape of the whole overhollow seam is adjusted.

According to a fifth aspect of the present invention, for example, as shown in FIG. 12, in the buttonhole stitch sewing machine according to the third aspect, a changing means (for example, the operation panel 100) for changing the given range is provided. It is characterized by being provided.

According to the fifth aspect of the invention, the needle drop point whose distance from the center line is changed is changed by changing the given range. Therefore, the shape of the hole stitches is adjusted to various shapes.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A specific embodiment will be described below with reference to the drawings as an example of a buttonhole stitch sewing machine according to the present invention. However, the drawings are schematically illustrated, and the scope of the invention is not limited to the illustrated examples. 1, 2, and 3 show a buttonhole overlock sewing machine 1 to which the present invention is applied. As shown in FIG. 5, the buttonhole overlock sewing machine 1 forms a buttonhole 200 on a cloth to be sewn as well as the buttonhole 200.
Before and after the formation of the buttonholes, the overhole stitches 208 are provided around the buttonhole 200. Hollow seam 208
Is a left zigzag sewing part 209 formed on the left side of the button hole 200, a first zigzag bartack sewing part 210 formed on the back side of the button hole 200, and a button hole 200.
A zigzag right side sewing portion 211 formed on the right side of the
And a zigzag second bartack stitching portion 212 formed on the front side of the button hole.

First, the structure of the buttonhole stitch sewing machine 1 will be described. As shown in FIGS. 1, 2 and 3,
The buttonhole sewing machine 1 includes a bed portion 2 having a substantially horizontal bed surface, a vertical body portion 3 standing upright at a rear portion of the bed portion 2, and extending from an upper portion of the vertical body portion 3 in parallel with the bed portion 2. The arm portion 4 that has been extended, the sewing machine motor 5 that is attached to the upper portion of the vertical body portion 3, the needle bar 8 that projects downward from the front end portion of the arm portion 4, and the sewing machine that is attached to the lower end of the needle bar 8. A needle 9; an elevating mechanism 50 that elevates the needle bar 8 and the sewing machine needle 9 by transmitting the power of the sewing machine motor 5; a needle swinging mechanism 51 that shakes the sewing machine needle 9 left and right; and a cloth feeding device 52 that feeds cloth. A cloth cutting knife 16 that projects downward from the front end of the arm portion 4, a cloth cutting knife cylinder 19 that raises and lowers the cloth cutting knife 16, and a hook device 12 provided in the bed portion 2 immediately below the needle bar 8. And the shuttle device 12 is operated in conjunction with the lifting mechanism 50. Interlocking mechanism 53, an upper thread cutting device 80 that cuts the upper thread, a lower thread cutting device (not shown) that cuts the lower thread, and an upper thread cutting actuator 76 that drives the upper thread cutting device 80 (see FIG. 4). And a lower thread cutting actuator 66 (shown in FIG. 4) for driving the lower thread cutting device,
Control device 1 for controlling the buttonhole sewing machine 1 as a whole
10 (shown in FIG. 4).

The cloth feeding device 52 includes the cloth feeding plate 14 on which the cloth is placed, the cloth presser 15 for pressing the cloth placed on the cloth feeding plate 14 against the cloth feeding plate 14, the cloth feeding plate 14 and the cloth feeding plate 14. The moving device 13 that integrally moves the presser foot 15 and the presser foot lifting solenoid 127 that vertically moves the presser foot 15 (see FIG. 4).
And shown in FIG. The moving device 13 includes a Y feed pulse motor 20, a feed shaft 22, a cloth feed member 23, and a connecting arm 24, and is configured as follows. That is, the Y feed pulse motor 20 is installed in the vertical barrel portion 3 and serves as a power source for the cloth feeding device 52. The feed shaft 22 extends in the front-rear direction, and a rack 22a is provided at the rear part thereof. The rack 22a meshes with the drive take-out shaft of the Y-feed pulse motor 20. An upper end portion of a cloth feeding member 23 extending vertically is fixed to an intermediate portion of the feeding shaft 22. At the lower end of the cloth feed member 23,
The base end portion of the connecting arm 24 is attached so as to be rotatable around the left and right axes. The presser foot 15 is attached to the tip (ie, the front end) of the connecting arm 24. The cloth presser 15 is connected to a presser foot lifting solenoid 127 that moves the cloth presser 15 up and down. Further, the base end of the cloth feed plate 14 is attached to the lower end of the cloth feed member 23. The cloth feed plate 14 is arranged substantially horizontally and is arranged on the bed surface of the bed portion 2.

In the cloth feeding device 52 described above, when the presser foot lifting solenoid 127 is turned on, the cloth presser 15 descends,
The cloth is clamped between the cloth feed plate 14 and the cloth presser 15. On the other hand, when the presser foot lifting solenoid 127 is turned off, the cloth presser 15 is lifted and the nipping of the cloth is released. Further, when the Y feed pulse motor 20 operates, the feed shaft 22 moves back and forth, and the cloth feed member 23, the cloth feed plate 14, the connecting arm 24, and the cloth presser 15 move back and forth together with the feed shaft 22. As a result, the cloth sandwiched between the cloth feed plate 14 and the cloth presser 15 is fed.

The lifting mechanism 50 comprises an upper shaft 6 and a needle bar slide base 1.
8 and a crank mechanism 7 and the like, and are configured as follows. The upper shaft 6 extends in the front-rear direction and is rotatably provided in the arm portion 4. The rear end of the upper shaft 6 is connected to the drive output shaft of the sewing machine motor 5. The front end portion of the upper shaft 6 is connected to the crank mechanism 7 at the front end portion inside the arm portion 4. The needle bar slide base 18 is provided at the front end of the arm portion 4 such that the upper end of the needle bar slide 18 is rotatable about an axis 18a parallel to the upper shaft 6. The needle bar 8 is slidably supported on the needle bar slide base 18 up and down. In the lifting mechanism 50 configured as described above, when the sewing machine motor 5 rotationally drives the upper shaft 6,
The rotary motion of is converted into an up-and-down motion by the crank mechanism 7 and transmitted to the needle bar 8, so that the sewing machine needle 9 moves up and down together with the needle bar 8.

The interlocking mechanism 53 includes an interlocking shaft 10 extending vertically in the vertical body portion 3, a lower shaft 11 extending frontward and rearward in the bed portion 2, and the like. Has been done. A bevel gear 10a is provided at the upper end of the interlocking shaft 10, and a bevel gear 10b is provided at the lower end of the interlocking shaft 10. The bevel gear 10a meshes with the bevel gear 6a,
The bevel gear 6a is provided on the rear portion of the upper shaft 6. On the other hand, the bevel gear 10b meshes with the bevel gear 11a, and the bevel gear 11a is provided at the rear end portion of the lower shaft 11.
A shuttle device 12 is provided at the front end of the lower shaft 11.
The shuttle 12 has a bobbin wound with a lower thread. In the interlocking mechanism 53 configured as described above, the rotational movement of the upper shaft 6 by the sewing machine motor 5 is transmitted to the shuttle device 12 via the interlocking shaft 10 and the lower shaft 11. The shuttle device 12 rotates in conjunction with the vertical movement of the needle bar 8 to cooperate with the sewing machine needle 9 to form a stitch on the cloth.

The needle swinging mechanism 51 includes a main needle swinging mechanism that swings the sewing machine needle 9 with a given swinging width in the left and right direction with a certain baseline as the origin, a swinging width changing mechanism that changes this swinging width, and a baseline as the horizontal direction. It is equipped with a baseline changing mechanism and the like.

As shown in FIG. 3, the main needle swing mechanism includes a gear 42a, a gear 42b, an eccentric cam 35, a needle swing cam lever 46, a connecting lever 47, a connecting shaft 48, and a needle swing arm 49. , Needle bar slide base 18, and is configured as follows. That is, the gear 42a is fixed to the upper shaft 6. A gear 42b meshes with the gear 42a. An eccentric cam 35 is attached to the gear 42b via a shaft 35a. The eccentric cam 35 slidably contacts a cam engaging portion formed at one end of the needle swing cam lever 46. The other end of the needle swing cam lever 46 is
It is rotatably connected to one end of the connecting lever 47. The other end of the connecting lever 47 is fixed to the rear end of the connecting shaft 48. The connecting shaft 48 extends back and forth,
It is rotatably provided in the arm portion 4. The front end of the connecting shaft 48 is fixed to one end of the needle swing arm 49. The other end of the needle swing arm 49 is rotatably connected to the lower end of the needle bar slide 18.

In the main needle swinging mechanism constructed as described above, the rotary motion of the upper shaft 6 is transmitted to the rotary motion of the eccentric cam 35 by the gears 42a and 42b, and the eccentric cam 35 rotates to rotate the needle swing cam lever. 46 swings with a given swing width. When the needle swing cam lever 46 swings, the connecting shaft 48 rotates in the normal direction and the needle bar slide base 18 rotates left and right about the axis 18a. The needle bar 8 is swung left and right by rotating the needle bar slide 18 left and right. The sewing machine needle 9 and the needle bar 8 are moved up and down by the elevating mechanism 50 and are swung left and right by the main needle swinging mechanism.

The swing width changing mechanism is provided with a needle swing feed pulse motor 41, a swing width arm 36, a link 37, a connecting link 45 and the like, and is constructed as follows. That is, the needle swinging feed pulse motor 41, the swinging width arm 36, the link 37, and the connecting link 45 are provided in the vertical barrel portion 3.
It is located inside. The pinion provided on the drive take-out shaft of the needle swing feed pulse motor 41 has a swing width arm 36.
Engages with a rack provided at one end of the. The other end of the swing arm 36 is rotatably connected to one end of a link 37. The other end of the link 37 is rotatably connected to one end of the connecting link 45. The other end of the connecting link 45 is rotatably connected to one end of the needle swing cam lever 46. In the swing width changing mechanism configured as described above, the swing width arm 36 and the link 37 are rotated by rotating the needle swing feed pulse motor 41.
Also, the swing width of the needle swing cam lever 46 is changed via the connection link 45, and thus the swing width of the sewing machine needle 9 is changed.

The baseline changing mechanism comprises a baseline feed pulse motor 4
0, a base line changing lever 43, a base line lever 44, and the like, and are configured as follows. That is, the pinion provided on the drive extraction shaft of the baseline feed pulse motor 40 meshes with the rack provided at one end of the baseline changing lever 43. The center portion of the baseline changing lever 43 is attached to the vertical barrel 3 so as to be rotatable about a fulcrum 43a, and the other end of the baseline changing lever 43 is rotatable about a fulcrum 44a. Is connected to one end of the base line lever 44. The other end of the base line lever 44 is rotatably connected to one end of a connecting link 45. In the baseline changing mechanism configured as described above, when the baseline feed pulse motor 40 rotates, the baseline changing lever 43 rotates about the fulcrum 43a, and the position of the fulcrum 44a of the baseline lever 44 changes. To be done. Fulcrum 44
The reference character “a” determines the origin of the swing motion of the needle swing cam lever 46. The origin of the swing motion of the needle swing cam lever 46 changes via the connecting link 45 when the position of the fulcrum 44 a changes, and The baseline position of the needle swing of the needle 9 is changed to the left or right.

As shown in FIG. 4, the control device 110 controls the C
The arithmetic processing unit having a PU 111, a ROM 112, a RAM 113, and a bus connecting these is a basic configuration. Further, the control device 110 includes a Y-feed pulse motor driver 114, which controls the drive of each pulse motor, a baseline feed pulse motor driver 115, and a needle swing feed pulse motor driver 116. Further, the controller 110
Is a needle thread cutting actuator driver 117 that controls the driving of the upper thread cutting actuator 76, a lower thread cutting actuator driver 118 that controls the driving of the lower thread cutting actuator 66, and a presser foot lifting solenoid that controls the driving of the presser foot lifting solenoid 127. Cylinder driver 1 for controlling the drive of driver 126 and cloth cutting knife cylinder 19
20 and a sewing machine motor driver 119 that controls the driving of the sewing machine motor 5. These drivers are C
It is connected to the PU 111 and controls a pulse motor, an actuator, a motor or a cylinder according to a signal from the CPU 111.

The sewing machine motor driver 119 includes, in addition to the sewing machine motor 5, a sewing machine motor encoder 121 which encodes the rotation amount of the sewing machine motor 5 as a rotation angle of the upper shaft 6.
And a needle upper position sensor 122 for detecting that the sewing machine needle 9 is at the upper position, and a TG for detecting the rotation speed of the upper shaft 6.
The (tacho generator) generator 123 etc. are connected.

The CPU 111 is connected with a presser switch 124 for instructing the lifting and lowering of the work clamp 15, a start switch 125 for instructing the drive start of the sewing machine motor 5, and the like. The operation panel 100 is connected to the CPU 111. The operation panel 100 detects that an operator or the like has operated and notifies the CPU 1 of that fact.
It is output to 11. As a result, workers etc.
By operating the operation panel 100, various data can be input.

The ROM 112 has an input process for inputting data from the operation panel 100, an arithmetic process for calculating control data for sewing based on input data input through the operation panel 100, and an arithmetic process. A control program 130 relating to sewing processing and the like for performing a sewing operation according to the control data thus stored is stored.

The ROM 112 stores a sewing database 132 that is referred to when calculating control data. Specifically, the sewing database 132 is shown in FIG.
It is a database as schematically shown in. As shown in FIG. 6, the sewing database 132 is composed of a plurality of pieces of sewing data relating to sewing by the buttonhole overlock sewing machine 1. Pattern No. is set for each sewing data. The pattern No. is attached. Each sewing data is identified by. Each sewing data includes various items such as “shape”, “overlock width”, “knife left adjustment value”, “knife right adjustment value” and “needle drop coordinate value”.

The "shape" represents the outer shape of the overlock stitch formed based on the sewing data. As the “shape”, one of the outer shapes of the overlock stitches shown in FIG. 7 is determined. The outer shape of the overhollow stitches of FIG. 7A is substantially rectangular like the overhollow stitches 208 of FIG. The outer shape of the overlock seam in FIG. 7B is such that the first bartacking stitched portion and the second bartacking stitched portion have a semicircular outer shape. In the outer shape of the overlock stitches shown in FIG. 7C, the first bar-tacking seam has a semicircular outer shape, and the second bar-tacking seam has a rectangular shape. The outer shape of the overlock seam in FIG. 7D is an outer shape in which the first bartacking stitching portion and the second bartacking stitching portion swell in a circular shape. The outer shape of the overlock seam in FIG. 7E is such that the first bartacking stitched portion and the second bartacking stitched portion have a pentagonal outer shape. The outer shape of the overlock seam in FIG. 7F is an outer shape in which the first bartacking stitched portion and the second bartacking stitched portion are tapered in a triangular shape.

"Knife left adjustment value" is as shown in FIG.
It is the distance from the center line 201 in the longitudinal direction of the button hole 200 to the right side edge of the left sewing portion 209, that is, the distance from the lower right position of the sewing needle 9 in the left sewing portion 209 to the center line 201.

The "scalpel right adjustment value" is as shown in FIG.
The distance from the center line 201 to the left side edge of the right sewing portion 211, that is, the sewing machine needle 9 in the right sewing portion 211.
Is the distance from the lower left position to the center line 201.

As shown in FIG. 5, the "overlock width" is the width between the left side sewing portion 209 and the right side sewing portion 211, that is, the lower position of the right sewing machine needle 9 in the left side sewing portion 209 and the right side sewing portion 211. To the lower left position of the sewing machine needle 9.

The "needle drop coordinate value" is data as schematically shown in FIG. That is, the "needle drop coordinate value" is the coordinate value of each position where the sewing machine needle 9 descends, and the order of the position where the sewing machine needle 9 descends. Here, the “needle drop coordinate value” in FIG. 8 is data regarding the overlock stitch having the outer shape of FIG. More specifically, the point where the front side edge of the second bartack stitching portion and the center line 201 intersect is the origin, and the cloth feed direction (front-back direction) is the Y direction.
Assuming that the needle swinging direction (left-right direction) is determined as the X direction, the descending order of the sewing machine needle 9 is the coordinates (X ₁ , Y ₁ ),
Coordinates (X ₂ , Y ₂ ), ..., Coordinates (X ₆₆ , Y ₆₆ ) are in this order. Here, when the X coordinate value of each coordinate is negative, the descending position of the sewing machine needle 9 is to the left of the center line 201 (that is, the Y axis), and when the X coordinate value is positive, the sewing machine needle 9 is The lowered position is to the right of the center line 201.

The X at the needle lowering position on the right side of the left sewing portion
Coordinate value (in the case of FIG. 8, X₂, X_Four, X ₆, X₈, X_Ten,
X₁₂, X₁₄, X₁₆And X₁₈) Is the “female left adjustment value” B
Then, it is determined by the following formula. X_(n)= -B In addition, the X coordinate value of the needle lowering position on the left side of the left sewing portion (see FIG. 8).
Then X₁, X₃, X _Five, X₇, X₉, X₁₁, X₁₃,
X₁₅, X₁₇And X₁₉) Is the following if the overedging width is A
It is determined by the formula below. X_(n)=-(A + B) In addition, the X coordinate value of the needle lowering position on the left side of the right sewing portion (see FIG.
Then X₃₅, X₃₇, X₃₉, X₄₁, X₄₃, X₄₅, X₄₇,
X₄₉And X₅₁) Is as follows, where C is the "scalpel right adjustment value"
Is determined by the formula. X_(n)= C Also, the X coordinate value of the needle lowering position on the right side of the right sewing portion (see FIG.
Then X₃₄, X₃₆, X₃₈, X₄₀, X₄₂, X₄₄, X₄₆,
X₄₈, X₅₀And X₅₂) Is determined by the following formula. X_(n)= A + C Therefore, the widths of the left and right side seams in the sewing data are
be equivalent to.

The CPU 111 can input input data from the operation panel 100 by performing input processing according to the control program 130 stored in the ROM 112. Further, the CPU 111 can calculate the control data based on the input data and the sewing database 132 stored in the ROM 112 by performing the calculation process according to the control program 130. Further, the CPU 111 performs the sewing process according to the control program 130, and can control each drive unit via each driver based on the control data and the detection signals from the various sensors. The RAM 113
Is a work area for the CPU 111 to temporarily store various data.

In the input process, the pattern No. When the value of is input from the operation panel 100, the CPU 111
The input pattern number. The sewing data of the value of is retrieved from the sewing database 132. Furthermore, the width correction factor α
When [%] is input from the operation panel 100, the CPU 1
11 corrects each needle descending position by the following equations (1) and (2) based on the width correction rate α and the retrieved sewing data. (X _(n) ', Y _(n) ') = (α / 100 x X _(n) , Y _(n) ) (where X _(n) ≥ 0) (1) (X _(n) ', Y _(n) ') = (X _(n) , Y _(n) ) (where X _(n) <0) (2)

Here, X _(n) is each X coordinate value of the "needle drop coordinate value" included in the retrieved sewing data, and Y _(n)
(n) is each Y coordinate value of the "needle drop coordinate value" included in the retrieved sewing data.

As a result, for example, the "needle drop coordinate value" shown in FIG. 8 is changed to a new "needle drop coordinate value" as shown in FIG. 9 and corrected. That is, the center line 20
Since each needle descending position to the right of 1 is corrected, the width correction rate α is calculated as the right of the corrected sewing data with respect to the distance from the center line 201 of each needle descending position to the right of the retrieved sewing data. It is the ratio of the distance from the center line 201 of each needle descending position. Here, since the widths of the left and right side sewing parts in the sewing data before correction are equal, the width correction rate α can be said to be the ratio of the width of the right sewing part to the width of the left sewing part in the corrected sewing data. If the width correction rate α is not input, the value is set to 100.

Further, in the input process, the correction ratio β
When the [%] and the correction ratio γ [%] are input from the operation panel 100, the CPU 111 sets each needle lowering position based on the width correction ratio α, the correction ratio β, the correction ratio γ and the retrieved sewing data. It is corrected by the equations (3) and (4). _{(X (n) ', Y} (n)') = (α / 100 × {1- (100-γ) / 100 × (Y ma x1 -Y (n)) / (Y max1 -Y min1)} × X _(n) , Y _(n) ) (where X _(n) ≧ 0) (3) (X _(n) ', Y _(n) ') = ({1- (100-β) / 100x ( _Ymax2- Y _(n) ) / ( _{Ymax2- Ymin2} )} * X _(n) , Y _(n) ) (however, X _(n) <0) ... (4)

Where Y_max1Is to the right of the center line 201
The Y seat on the farthest side (that is, the maximum) among the needle descending positions of
This is the standard value, for example Y in the case of FIG.₂₀Is. Y_min1Is
Of the needle descending positions to the right of the center line 201, the foremost position
(That is, the minimum) Y coordinate value, for example, in the case of FIG.
Y₆₆Is. Y_max2Is each needle below the center line 201
It is the Y coordinate value of the deepest side (that is, the maximum) in the descending position.
For example, in the case of FIG. 8, Y _{twenty one}Is. Y_min2Is the center line 2
Of the needle descending positions to the left of 01, this is the frontmost position (that is,
Minimum) Y coordinate value, for example Y in the case of FIG.₆₅And
It

As a result, for example, the "needle drop coordinate value" shown in FIG. 8 is corrected as shown in FIG. That is, the correction ratio β is to the left of the center line 201 and is the minimum Y coordinate value before correction, that is, the needle descending position before correction (in FIG. 8,
The corrected needle lowering position (in FIG. 10, the coordinate (X ₆₅ , Y ₆₅ )) to the center line 201 (the coordinate (X _65
65 ′, Y ₆₅ ′)) to the center line 201 (hereinafter, this ratio is referred to as a ratio ζ). Further, the needle descending position that is on the left side of the center line 201 and has the maximum Y coordinate value is not corrected, and in the case of FIGS. 8 and 10, X ₂₁ = X ₂₁ ′. That is, the center line 2
The ratio of the distance from the needle down position after correction to the center line 201 to the distance from the needle down position before correction, which is on the left side of 01 and is the maximum Y coordinate value, to the center line 201 (hereinafter, the ratio η Is 100%.
Therefore, the correction ratio β can also be said to be the ratio of the ratio ζ to the ratio η.

At each needle descending position to the left of the other center line 201, the X coordinate value is linearly interpolated corresponding to the Y coordinate value, and the coefficient of the linear interpolation is as shown in the above equation. 100-β) / 100. That is, referring to FIG. 8, X _(n) 'is the distance in the Y direction from the needle lowering position of (X ₂₁ , Y ₂₁ ) to the needle lowering position of (X _(n) , Y _(n) ). The correction ratio β is linearly interpolated by the correction ratio (that is, {1- (100-β) / 100 × (Y _max2 −
Y _(n) ) / ( _{Ymax2- Ymin2} )}).

Also, with respect to the respective needle descending positions on the right side of the center line 201, if the width correction rate α is 100, it is the same as the respective needle descending positions on the left side. That is, the width correction rate α is 100
In this case, the correction ratio γ is to the right of the center line 201 and is the minimum Y coordinate value.
Then, for the distance from the coordinate (X ₆₆ , Y ₆₆ )) to the center line 201, the distance from the corrected needle lowering position (coordinates (X ₆₆ ′, Y ₆₆ ′ in FIG. 10) to the center line 201 It is a ratio. Further, the needle descending position that is on the right side of the center line 201 and has the maximum Y coordinate value is not corrected, and in the case of FIGS. 8 and 10, X ₂₀ = X ₂₀ ′. Then, for each needle descending position to the right of the other center line 201, the X coordinate value is linearly interpolated corresponding to the Y coordinate value, and the coefficient of the linear interpolation is (100−γ )
/ 100.

When the correction ratio γ is 100, the formula (3) is equivalent to the formula (1), and when the correction ratio β is 100, the formula (4) is equivalent to the formula (2). . When the correction ratio β or the correction ratio γ is not input, the respective values are set to 100.

Further, in the input process, when the inner reference value δ and the previous reference value ε (where δ> ε) are input from the operation panel 100, the CPU 111 causes the width correction rate α, the correction ratio β, and the correction ratio γ. , The back reference value δ, the front reference value ε and the retrieved sewing data are used to calculate the needle lowering position by the following formula (5).
To (10). (X _(n) ', Y _(n) ') = (α / 100 x X _(n) , Y _(n) ) (where X _(n) ≥ 0 and Y _(n) > δ) (5) (X _(n) ', Y _(n) ') = (X _(n) , Y _(n) ) (where X _(n) <0 and Y _(n) > δ) (6) (X _{(n ) ', Y (n)'} ) = (α / 100 × {1- (100-γ) / 100 × (Y ma x3 -Y (n)) / (Y max3 -Y min3)} × X (n) , Y _(n) ) (where X _(n) ≥ 0 and ε ≤ Y _(n) ≤ δ) (7) (X _(n) ', Y _(n) ') = ({1- (100- β) / 100 × (Y _max4 −Y _(n) ) / (Y _max4 −Y _min4 )} × X _(n) , Y _(n) ) (where X _(n) <0 and ε ≦ Y _(n)) ≤ δ) (8) (X _(n) ', Y _(n) ') = (α / 100 x γ / 100 x X _(n) , Y _(n) ) (where X _(n) ≥ 0 and Y _(n) <ε) (9) (X _(n) ', Y _(n) ') = (β / 100 x X _(n) , Y _(n) ) (where X _(n) <0 and Y _(n) <ε) ... (10)

Where Y_max3Is to the right of the center line 201
In each needle descending position of and ε ≦ Y_{(n )}Most within ≦ δ
It is the Y coordinate value on the back side (that is, the maximum).
Case Y₃₉Is. Y_min3Is to the right of the center line 201
In the needle descending position and ε ≦ Y _(n)In the range of ≦ δ
(That is, the minimum) Y coordinate value, for example, in the case of FIG.
Y₄₈Is. Y_max4Is each needle below the center line 201
Ε ≦ Y in the descending position_{(n )}In the range of ≤ δ,
, The maximum) Y coordinate value. For example, in the case of FIG.₁₄so
is there. Y_min4Is the needle descending position to the left of the center line 201.
Ε ≦ Y in_(n)In the range of ≦ δ,
Small) Y coordinate value, for example Y in the case of FIG. _FiveIs.

As a result, for example, the "needle drop coordinate value" shown in FIG. 8 is corrected as shown in FIG. That is, the correction ratio β is the distance from the center line 201 at the corrected needle lowering position to the distance from the center line 201 at the uncorrected needle lowering position _where X _(n) <0 and Y _(n) <ε. Is the ratio. Then, X _(n) <0 and ε ≤ Y _(n) ≤
For each needle descending position of δ, the X coordinate value is linearly interpolated corresponding to the Y coordinate value, and the coefficient of the linear interpolation is (100−β) / 100 as in the above equation. On the other hand, when the width correction rate α is 100, the correction rate γ is X _(n) ≧
It is the ratio of the distance from the center line 201 at the corrected needle lowering position to the distance from the center line 201 at the uncorrected needle lowering position _where 0 and Y _(n) <ε. And
For each needle descending position _where X _(n) ≧ 0 and ε ≦ Y _(n) ≦ δ, the X coordinate value is linearly interpolated corresponding to the Y coordinate value, and the coefficient of the linear interpolation is Like (100-γ)
/ 100. If the back reference value δ or the front reference value ε is not input, the value of the back reference value δ is the Y coordinate value on the farthest side among the needle descending positions (Y ₂₀ or Y in the case of FIG. 8). ₂₁ ), and the value of the front reference value ε is the most front Y coordinate value in each needle descending position (Y ₆₅ or Y _{66 in} the case of FIG. 8). In this case, the expressions (7) and (8) are equivalent to the expressions (3) and (4).

For the above equations (1) to (10), α
The coefficient of / 100 is on the right side (that is, X _(n)≧ 0) each needle down
It was used to calculate the descending position, but not on the right
Conversely, on the left side (ie X_(n)Calculate each needle descent position of <0)
It may be used when

As described above, the CPU 111 calculates and corrects the "needle drop coordinate value" by the equations (1) to (10) in the calculation processing, and then the corrected "needle drop coordinate value".
As control data, the sewing process can be performed based on the control data.

Next, the structure of the operation panel 100 will be described. The operation panel 100 includes a width correction rate α, a correction ratio β, a correction ratio γ, a back reference value δ, a previous reference value ε, and a pattern No. Used to set the value of. Operation panel 1
00, as shown in FIG.
1, data item operation unit 154, data value operation unit 163,
A mode switching operation unit 158 is provided.

The start operation section 151 is provided with a preparation key 152 for the operator to input that the sewing preparation is completed.
And a lighting unit 1 such as an LED that indicates the state by lighting.
53 and 53 are provided.

The data item operation section 154 includes an item number display section 155, a down key 156, and an up key 157.
And are provided. The item number display section 155 is composed of a two-digit seven-segment display and displays a number. The down key 156 and the up key 157 are used for the item number display section 1
This is a key for changing the numbers displayed on the screen one by one. When the down key 156 is operated, the number displayed on the item number display portion 155 is moved down by one, and when the up key 157 is operated, the number displayed on the item number display portion 155 is moved up by one.

The data value operation section 163 has a data value display section 164, a minus key 165, and a plus key 166.
And are provided. The data value display unit 164 is composed of a 4-digit 7-segment display and displays the data value. The minus key 165 and the plus key 166 are keys for increasing or decreasing the data value displayed on the data value display portion 164. When the minus key 165 is operated, the value displayed in the data value display section 164 decreases, and the plus key 16
When 6 is operated, the value displayed on the data value display unit 164 increases.

The mode switching section 158 is provided with a pattern setting mode key 160, a data input mode key 162, and lighting sections 159 and 161. The pattern setting mode key 160 is used for the pattern No. It switches to the pattern setting mode for setting the value of. When the pattern setting mode key 160 is operated, the lighting section 159 lights up. On the other hand, the data input mode key 162 switches to a data input mode for inputting a data value. When the data input mode key 162 is operated, the lighting section 161 lights up.

Next, using the operation panel 100, the width correction ratio α, the correction ratio β, the correction ratio γ, the inner reference value δ, the previous reference value ε and the pattern No. A method of setting the value of will be described.

First, in the operation panel 100, the lighting unit 15
3 is not displayed. Then, the operator uses the pattern N
o. To set. Pattern No. When the operator operates the pattern setting mode key 160 to set, the lighting unit 159 is turned on and the mode is switched to the pattern setting mode. Further, a number is displayed on the item number display portion 155,
In particular, "01" is displayed by default. Lighting unit 15
When the pattern No. 9 is turned on, the operator can recognize that the pattern setting mode has been entered, and the number displayed on the item number display portion 155 is the pattern number. It can be recognized that it is the value of. Then, the operator operates the down key 156 or the up key 157 to change the number displayed on the item number display portion 155, and the pattern number. Change the value of to the desired value. Thereby, the pattern No. Is set.

Next, the operator sets the width correction rate α, the correction ratio β, the correction ratio γ, the inner reference value δ, and the previous reference value ε.
When the operator operates the data input mode key 162 in order to set the width correction rate α, the correction ratio β, the correction ratio γ, the back reference value δ, and the front reference value ε, the lighting unit 161 lights and the lighting unit 159. Turns off and switches to the data input mode. Further, numbers are displayed on the item number display portion 155, and in particular, "01" is displayed by default. The lighting of the lighting unit 161 allows the operator to recognize that the data input mode has been entered, and the number displayed in the item number display unit 155 can be set as an item (width correction rate α, correction ratio β, correction ratio γ). , The inner reference value δ or the previous reference value ε) can be recognized. That is, for example, when "01" is displayed on the item number display portion 155, it is the setting mode of the width correction rate α, and when "02" is displayed, it is the setting mode of the correction ratio β, "03". Is displayed, it means that the correction ratio γ is in the setting mode and “0
When "4" is displayed, it is the setting mode of the inner reference value δ, and when "05" is displayed, it is the setting mode of the previous reference value ε.

Then, the operator operates the down key 156 or the up key 157 to operate the item number display section 1
The number displayed on 55 is changed, and the desired setting mode is selected. When the setting mode is selected, the default value of the item (width correction rate α, correction ratio β, correction ratio γ, back reference value δ or previous reference value ε) set in the setting mode is displayed as the data value. It is displayed in the section 164. In this state, the operator uses the minus key 165 or the plus key 16
By operating 6, the value displayed on the data value display portion 164 is changed, and if the desired value is changed, the item setting is completed. The set value is R as the input value of the item.
It is stored in the AM 113.

As described above, the operator presses the down key 15
6. By operating the up key 157, the minus key 165 and the plus key 166, the width correction rate α, the correction ratio β, the correction ratio γ, the back reference value δ or the previous reference value ε can be changed and set. You can

The operation of the buttonhole stitch sewing machine 1 configured as described above, and the control device 1 by the CPU 111.
The process flow of 10 will be described.

As shown in FIG. 13, first, the controller 11
0 is the control program 130 stored in the ROM 112
Input processing is performed according to (step S1). That is, when the operator operates the operation panel 100, the pattern N
o. , The width correction rate α, the correction ratio β, the correction ratio γ, the back reference value δ or the previous reference value ε are set.
Enter each setting value from the operation panel 100, and
Store at 13.

Then, the controller 110 uses the preparation key 15
It is determined whether or not 2 is operated and pressed (step S
2) When the preparation key 152 is pressed (step S
2: Yes), and the process of the control device 110 moves to step S3. In step S3, the control device 110 controls the pattern No. , Width correction ratio α, correction ratio β, correction ratio γ, back reference value δ or previous reference value ε are set to the set values stored in the RAM 113.

Next, the control device 110 performs arithmetic processing based on the confirmed set value (step S4). That is, first, the control device 110 sets the pattern number. The sewing data corresponding to the value of is searched for and read from the sewing database 132. After that, the control device 110 uses one of the formulas (1) to (10) based on the input width correction rate α, correction ratio β, correction ratio γ, inner reference value δ, and previous reference value ε. , "Needle drop coordinate value" included in the sewing data
To correct. Then, the control device 110 stores the control data including the corrected “needle drop coordinate value” in the RAM 113.

Next, the control device 110, the preparation key 152
Is pressed (step S5), and if the preparation key 152 is not pressed, the process of the control device 110 shifts to step S1, and if the preparation key 152 is pushed, the process proceeds to step S6. Transition.

In step S6, the control device 110 determines whether or not the presser foot switch 124 is operated and pressed,
When the presser foot switch 124 is pressed, the presser foot lifting solenoid 127 is controlled to lower the work clamp foot 15 (step S7). As a result, the cloth placed on the cloth feed plate 14 is sandwiched by the cloth presser 15.

Next, the control device 110 judges whether or not the start switch 125 has been operated and pushed (step S8). If the start switch 125 has been pushed, the process of the control device 110 shifts to step S9. To do.

That is, in step S9, the controller 11
0 controls the sewing machine motor 5, the Y feed pulse motor 20, the baseline feed pulse motor 40, and the needle swing feed pulse motor 41 based on the control data, thereby moving the sewing machine needle 9 up and down and rotating the shuttle device 12. , The presser foot 15 and the cloth feed plate 14 are moved, or the sewing machine needle 9 is shaken left and right. As a result, the sewing machine needle 9 descends to each needle descending position in a given order according to the corrected "needle drop coordinate value". Therefore, a perforated seam is formed on the cloth in the order of the left side stitched portion, the first bar tacked stitched portion, the right side stitched portion and the second bar tacked stitched portion.

Next, the controller 110 operates the cloth cutting knife cylinder 19 to lower the cloth cutting knife 16. As a result, the button hole 200 is formed in the cloth, and when the button hole 200 is formed, the cloth cutting graduated cylinder 19
As a result, the cloth cutting knife 16 rises. Next, the control device 1
No. 10 causes the upper thread cutting device 76 to cut the upper thread by operating the upper thread cutting actuator 76, and causes the lower thread cutting device to cut the lower thread by operating the lower thread cutting actuator 66. With the above, a series of operations for forming one button hole is completed.

Next, the effect of the buttonhole stitch sewing machine 1 will be described with reference to FIG. When the width correction ratio α, the correction ratio β, the correction ratio γ, the back reference value δ, and the front reference value ε are not set (that is, the width correction ratio α = the correction ratio β =
The correction ratio γ = 100 is set, the back reference value δ is set to be larger than the Y coordinate of the needle descending position of the farthest side of the overhollow stitch 208, and the front reference value ε is set to the foremost needle of the overhollow stitch 208. When the size is set to be smaller than the Y coordinate of the lowered position), the overholstered seam 208 having the outer shape as shown in FIG. 14A is formed on the cloth. That is, ROM in advance
The “needle drop coordinate value” included in the sewing data stored in 112 is not changed / corrected, and the overlocking stitch 208 is formed on the cloth according to the sewing data as it is.

The width correction rate α is set to 0 <α <100, and the correction ratio β, the correction ratio γ, the inner reference value δ, and the previous reference value ε are set.
14B is not set, a perforated seam 208 having an outer shape as shown in FIG. 14B is formed on the cloth. Since the needle lowering position on the right side of the center line 201 is uniformly changed / corrected by the width correction rate α, the left-right balance of the outer shape of the overlock stitch 208 is adjusted as shown in FIG. 14B. . Further, the right side edges of the first bartacking stitched portion 210 and the second bartacking stitching portion 212 are not discontinuous with the right edge of the right side stitching portion 211, and the joints are aligned. Therefore, the outer shape of the overhole seam 208 shown in FIG. 14B is neat.

When the width correction rate α, the back reference value δ and the front reference value ε are not set and 0 <correction ratio β = correction ratio γ <100 is set, the outer shape as shown in FIG. A perforated seam 208 is formed in the fabric. 14
As shown in (c), the width of the overhole seam 208 becomes narrower toward the front. Further, the left side edges of the first bartacking stitching portion 210 and the second bartacking stitching portion 212 are not discontinuous with the left side edge of the left side stitching portion 209, and the joints are aligned. Further, the right side edges of the first bartack stitching portion 210 and the second bartack stitching portion 212 are not discontinuous with the right edge of the right side stitch portion 211, and the joints are aligned.
Therefore, the overhole seam 208 shown in FIG.
The outer shape of is clean.

Without setting the width correction rate α, 0 <correction rate β =
The correction ratio γ <100 is set, the back reference value δ is set to be smaller than the Y coordinate of the needle lowering position of the farthest side of the overhollowed stitch 208, and the front reference value ε is set to the frontmost needle of the overhollowed stitch 208. If it is set larger than the Y coordinate of the lowered position,
An overhole seam 208 having an outer shape as shown in FIG. 14D is formed on the cloth. As shown in FIG. 14D, in the range in which the Y coordinate is larger than the inner reference value δ, the needle descending positions have not been changed or corrected. In the range between the back reference value δ and the front reference value ε, the needle descending positions are changed / corrected, and the distance from the center line 201 becomes smaller toward the front side, and within that range, there is a hole stitching stitch. The width of 208 is narrower toward the front. In the range where the Y coordinate is smaller than the previous reference value ε, each needle descending position is uniformly changed / corrected by the correction ratio β or the correction ratio γ. Further, the left side edges of the first bartacking stitching portion 210 and the second bartacking stitching portion 212 are not discontinuous with the left side edge of the left side stitching portion 209, and the joints are aligned. Further, the right side edges of the first bartack stitching portion 210 and the second bartack stitching portion 212 do not become discontinuous with the right edge of the right side stitch portion 211,
The joints are aligned. Therefore, the outer shape of the overhole seam 208 shown in FIG. 14D is neat.

Further, the "needle drop coordinate value" before correction used when the over stitched seam 208 of FIGS. 14 (b), 14 (c) and 14 (d) is sewn is shown in FIG. 14 (a). It is the same as "needle drop coordinate value". In this way, the hole stitches 208 of various shapes are formed from one "needle drop coordinate value".

The present invention is not limited to the above-described embodiment, and within the scope not departing from the gist of the present invention,
Various improvements and design changes may be made.

For example, in the above embodiment, the sewing database 132 includes the "needle drop coordinate value" before correction, but the "needle drop coordinate value" is input from the input data such as "shape" and "overdraft width". You may calculate. The present invention is applied to a sewing machine that performs buttonhole overlock stitching using lock stitch,
It may be applied to a sewing machine that performs buttonhole sewing by chain stitching.

[0086]

According to the first aspect of the present invention, since the distances from the side edges of the bartacking sewn portion and the side sewn portion to the center line are corrected and adjusted at the same correction rate, the bartacking sewing is performed. The seams of the seam and side seams are aligned and aligned. Therefore, a well-formed holed seam is formed. In addition, the width of the left or right side stitch is adjusted, and the left and right balance of the shape of the hole stitch is adjusted.

According to the second aspect of the present invention, by changing the correction factor, it becomes possible to give various shapes of overlock stitches.

According to the third aspect of the invention, based on the linearly interpolated ratio, for each needle drop point within the given range, the distance from the center line is changed so that a new needle drop point is created. The stitches are calculated and a hole stitch is formed at the new needle drop point. Therefore, the distance from the center line is adjusted for each needle drop point within the given range. In this way, the distance from the center line to each needle drop point is corrected based on the linearly interpolated ratio, and even if there is a seam between the bartack stitch and the side stitch in the given range, the The joints are continuous and aligned. Therefore, a well-formed holed seam is formed.

Further, since the ratio is linearly interpolated by the distance from the foremost needle drop point (or the last needle drop point), the correction rate of each needle drop point is along the length direction of the button hole. Change. Therefore, for example, even if the shape of the hole stitches before correction is rectangular, the shape of the modified hole stitches is not rectangular. For example, even if the right edge or left edge of the pre-corrected hole stitch is parallel to the center line, the right edge or left edge of the modified hole stitch is inclined with respect to the center line. become. Therefore, it is possible to form overlock stitches having various shapes.

According to the fourth aspect of the invention, the distance from the center line is adjusted for all the needle drop points of the overlock stitch. Therefore, the shape of the whole overhollow seam is adjusted.

According to the invention of claim 5, the needle drop point whose distance from the center line is changed is changed by changing the given range. Therefore, it becomes possible to apply overlock seams of various shapes.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a specific embodiment of a buttonhole overlock sewing machine to which the present invention is applied.

FIG. 2 is a perspective view mainly showing a cloth feeding mechanism and a lifting mechanism provided in the buttonhole overedger sewing machine in a see-through manner.

FIG. 3 is a perspective view mainly showing a lifting mechanism and a needle swinging mechanism provided in the buttonhole overlock sewing machine in a see-through manner.

FIG. 4 is a block diagram showing a control system of the buttonhole stitch sewing machine.

FIG. 5 is a view for explaining a buttonhole stitch provided by the buttonhole stitch sewing machine.

FIG. 6 is a drawing schematically showing a data structure of a sewing database stored in the buttonhole overlock sewing machine.

FIG. 7 is a diagram for explaining a “shape” of the sewing database.

FIG. 8 is a drawing for explaining “needle drop coordinate values” of the sewing database, and the data structure thereof is schematically represented.

FIG. 9 is a diagram for explaining a corrected “needle drop coordinate value”.

FIG. 10 is a diagram for explaining a corrected “needle drop coordinate value” different from the corrected “needle drop coordinate value”.

FIG. 11 is a diagram for explaining a corrected “needle drop coordinate value” different from the corrected “needle drop coordinate value”.

FIG. 12 is a plan view showing an operation panel provided on the buttonhole stitch sewing machine.

FIG. 13 is a flowchart showing a processing flow of a control device provided in the buttonhole sewing machine.

FIG. 14 is a view for explaining a buttonhole stitch provided by the buttonhole stitch sewing machine.

FIG. 15 is a view for explaining a buttonhole stitch provided by a conventional buttonhole stitch sewing machine.

[Explanation of symbols]

1 Buttonholing sewing machine 5 Sewing machine motor (sewing means) 9 Sewing machine needle (needle) 12 Hook device (sewing means) 50 Lifting mechanism (sewing means) 51 Needle swinging mechanism (sewing means) 52 Cloth feeding device (cloth feeding means) 53 interlocking mechanism (sewing means) 110 control device (sewing control means, input means, computing means) 200 button hole 201 center line 208 overlock stitch 209 left side stitch 210 first bar-tacking stitch 211 right side stitch 212 second bar Tie seams

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B150 AA24 CB03 DB03 GD14 GD22                       GF02 GF03 JA03 JA07 JA11                       JA20 JA31 LA05 LA07 LA15                       LA73 LA88 LB01 LB02 NA05                       NA14 NA64 NB02 NB03 NC03                       NC06 NC11 QA02 QA06 QA07                       QA08

Claims (5)

[Claims] 1. A cloth feeding means for holding and sending a sewn object, a sewing means for forming a stitch on the sewn object by moving a needle up and down, and a cloth feeding means and a sewing means for controlling the sewn means. A buttonhole overlock sewing machine including sewing control means for forming a buttonhole stitch including side stitches arranged on the left and right of the buttonhole and bartacking portions arranged before and after the buttonhole. Input means for inputting a correction rate of the distance from the center line in the longitudinal direction to the needle entry point of the overlock stitch, and for each needle entry point to the left or right of the center line, based on the correction rate. And a computing means for computing a new needle drop point by changing the distance from the center line, wherein the sewing control means is based on the new needle drop point calculated by the computing means. To form Button sewing machine which is characterized. 2. The buttonhole stitch sewing machine according to claim 1, further comprising a changing unit for changing the value of the correction rate. 3. A cloth feeding means for holding and sending a sewn object, a sewing means for forming a stitch on the sewn object by moving a needle up and down, and a cloth feeding means and a sewn means for controlling the sewn means. A buttonhole overlock sewing machine including sewing control means for forming a buttonhole stitch including side stitches arranged on the left and right of the buttonhole and bartacking portions arranged before and after the buttonhole. Correction ratio of the distance from the last needle drop point to the center line to the correction ratio of the distance from the front needle drop point to the center line in the longitudinal direction of the button hole within a given range along the longitudinal direction of Input means for inputting the ratio of, and for each needle drop point within the given range, along the longitudinal direction from the foremost needle drop point or the last needle drop point to each needle drop point. Linear interpolation of the ratio by distance And a calculation means for calculating a new needle drop point by changing the distance from the center line based on the correction rate obtained by the above, and the sewing control means calculates a new needle calculated by the calculation means. A buttonhole stitch sewing machine characterized by forming a hole stitching seam based on a drop point. 4. The buttonhole stitch sewing machine according to claim 3, wherein the given range is substantially equal to the length of the buttonhole stitch, and each needle drop point within the given range is all needles of the buttonhole stitch. Buttonholing sewing machine characterized by a falling point. 5. The buttonhole stitch sewing machine according to claim 3, further comprising changing means for changing the given range.