JP2003010577A - Buttonhole sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buttonhole sewing machine for forming a buttonhole sewing seam with pretty appearance and high quality of sewing around a buttonhole. SOLUTION: In the buttonhole sewing machine 1 for performing buttonhole sewing, after side stitch (u1 and u2) of side stitch parts (T1 and T2) is performed and before bar tacking (w1 and w2) of bar tacking parts (S1 and S2) is performed, zigzag reinforcing sewing (z1 and z2) is formable on the bar tacking parts in the directions intersecting approximately at right angles to the seam directions of the bar tacking and sewing pitch, and tension and sewing speed of the reinforcing sewings are changeable on an operation panel 100.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A buttonhole overedging machine is known in which buttonholes are formed in a material to be sewn and overlap sewing is performed around the buttonholes. With buttonhole sewing machines, the upper thread that is passed through the sewing machine needle and the lower thread that is wound on the bobbin inside the hook device are entwined while the material to be sewn, which is held by the cloth presser, is fed in the specified direction by the cloth feed mechanism. To form a seam. Then, by lowering the upper knife toward the lower knife receiver, the sewing object is incised to form a button hole.

In this buttonhole sewing machine, when the buttonhole formed in the material to be sewn is elongated in the front and rear direction, the sewing machine needle is swung in the left and right direction and the cloth feed mechanism feeds the front and rear sewn material in the front and rear direction. Side stitching (overlock stitching) is performed on the left and right parallel portions that are along the left and right sides of the button hole, and bar tacking sewing is performed on the upper and lower bar-tacking portions of the button hole, respectively.
In addition, the seams formed on all the parts around the buttonhole are in a zigzag shape which is alternately bent right and left.

[0004]

However, in the sewing machine for overlocking the buttonhole as described above, when the bartacking is sewn on the bartack portion, if the tension of the sewing thread to be sewn is weak, the buttonhole is moved in the left-right direction. There is a problem in that the button hole is pushed open when the button is hung on the button hole and the shape of the button hole collapses. To improve this, it is possible to increase the tension of the sewing thread that is sewn with bartacking stitches.In this case, wrinkles (dimples) occur around the stitches of the button hole of the material where the sewing thread is sewn, and the appearance is beautiful. Is lost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a buttonhole sewing machine which forms a buttonhole oversea stitch which is beautiful in appearance around the buttonhole and has a high sewing quality.

[0006]

In order to solve the above problems, the invention according to claim 1 moves up and down with respect to the material to be sewn by the rotation of the main shaft 6 as shown in, for example, FIGS. 1 to 11. The sewing machine includes a sewing machine needle 9, a cloth pressing means (for example, a cloth presser 15) for pressing the sewing object, and a vertically movable cloth cutting knife 16 provided in the vicinity of the sewing machine needle, and the sewing machine needle is the sewing object. To swing relative to
By moving the sewing machine and the cloth pressing means,
A pair of side stitches (left parallel portion T1, right parallel portion T2) along both left and right sides of the button hole H1 cut and formed by the cloth cutting knife, and at the side stitch portion located at least at one end side of the button hole. At least one side of the pair of side stitches in the buttonhole stitch sewing machine 1 for forming buttonhole stitches on a continuous bartacking portion (first bartacking portion S1 and second bartacking portion S2). Side stitching of the seam (u1, u
2) Afterwards, bar tacking sewing of the bar tacking portion (w1, w2)
Before, by swinging the needle substantially parallel to the sewing direction of the bartacking stitch, it is possible to form a zigzag reinforcing stitch (z1, z2) in the sewing direction orthogonal to the sewing direction of the bartacking stitch on the bartacking portion. A control means (CPU 111) for controlling is provided.

According to the first aspect of the present invention, since the zigzag reinforcement sewing is performed after the side seam is sewn and before the bar tacking is sewn, the bar tacking is reinforced by the reinforcement sewing. Since the bar-tacking portion is formed, the bar-tacking portion is formed without wrinkles. Therefore, it is possible to form a buttonhole overlaid seam that is beautiful in appearance around the buttonhole and has a high sewing quality.
Further, since the bar-tacking seams and the reinforcing seams are formed in the bar-tacking portion, the button hole which is over-sewn on the periphery is not spread and the shape of the button hole can be maintained. .

According to a second aspect of the present invention, there is provided a buttonhole sewing machine according to the first aspect, wherein, for example, as shown in FIG. 8, the control means separates the reinforcing stitch from the pair of side stitch portions. It is characterized in that the bar-tacking portion is formed at a different position.

According to the second aspect of the present invention, since the reinforcing stitch is formed at a position distant from the side stitch portion, the reinforcing stitch is formed at a position close to the outer edge of the bar-tacking portion, and wrinkles are formed around the seam of the button hole. (Dimples) can be prevented from occurring.

The invention according to claim 3 is the invention according to claim 1 or 2.
The buttonhole sewing machine as described above, for example, as shown in FIG. 5 or FIG. 8, is provided with a swing width setting means (operation panel 100) for setting the needle swing width at the time of the reinforcement sewing, and by this swing width setting means The set needle swing width at the time of reinforcement sewing is characterized by being smaller than the length in the sewing direction of the bar tacking stitch of the bar tacking portion where the reinforcement stitch is formed (B, C shown in FIG. 8).

According to the third aspect of the present invention, the stitch width of the reinforcement stitch is set smaller than the length of the bar tack stitch in the sewing direction by the swing width setting means, so that the reinforcement stitch is hidden by the bar tack stitch. It is formed into a beautifully finished product. In addition, since the bar-tacking length is usually longer than the pitch of the parallel part, if the needle swing width of the reinforcement sewing is the same as the bar-tacking length, the feed amount becomes large and the rotation speed of the sewing machine spindle is increased. You need to slow down. Therefore, the needle swing width can be set freely, and the cycle time can be shortened.

A fourth aspect of the present invention is a buttonhole sewing machine according to any one of the first to third aspects,
For example, as shown in FIGS. 5 to 8, it is characterized in that a pitch setting means (operation panel 100) for setting the sewing pitch (D shown in FIG. 8) of the reinforcement sewing is provided.

According to the fourth aspect of the invention, since the stitch pitch of the zigzag stitch of the reinforcement stitch can be freely set, the optimum pitch can be selected according to the kind and thickness of the material.

According to a fifth aspect of the present invention, there is provided a buttonhole sewing machine according to any one of the first to fourth aspects,
For example, as shown in FIG. 5 or 6, tension setting means (operation panel 10) for setting the tension of the sewing thread of the reinforcing stitch.
0) is provided.

According to the invention of claim 5, it is possible to adjust the tension of the sewing thread of the reinforcement sewing corresponding to the kind and thickness of the material.

A sixth aspect of the present invention is a buttonhole sewing machine according to any one of the first to fifth aspects,
For example, as shown in FIG. 5 or 6, sewing speed setting means (operation panel 10) for setting the sewing speed of the reinforcement sewing.
0) is provided. The sewing speed of the reinforcement sewing can be changed, for example, by changing the rotation speed of the main shaft.

According to the sixth aspect of the invention, the sewing speed of the reinforcement sewing can be changed by the sewing speed setting means according to the type and thickness of the material. The sewing speed at the time of reinforcement sewing is set to be slower than the sewing speed of the side stitch of the side stitch portion or the bar tack stitch of the bar tack portion.

A seventh aspect of the present invention is a buttonhole sewing machine according to any one of the first to sixth aspects,
For example, as shown in FIG. 5 to FIG. 11, the reinforcing stitch is
It is characterized in that the bar-tacking portions which are continuous with the pair of both side sewn portions and are located on both end sides of the button hole are individually controllable.

According to the invention of claim 7, when the shape of the bartacking stitches formed by the bartacking sections at both ends is different, the optimum shape corresponding to the shape of the bartacking stitches of each bartacking section. Reinforcing seams can be formed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. A buttonhole sewing machine 1 as an example of the present invention, as shown in FIGS.
The bed portion 2, the vertical body portion 3, and the arm portion 4 are provided. The sewing machine 1 includes a sewing machine needle 9 for performing an ascending / descending operation and a needle swinging operation to the left / right, a cloth presser 15 for pressing a cloth (sewn object), and a cloth presser 15.
The lower side of the cloth, the upper and lower sides of the cloth feed plate 14 for holding the cloth and moving back and forth in the cloth feeding direction (Y direction), the upper thread cutting device 80 for cutting the upper thread on the upper side of the presser foot 15, and the lower thread for the needle plate 55. Bobbin thread cutting device for cutting the cloth, the cloth cutting knife 16 for cutting the cloth to form the button hole H1, the operation panel 100 (FIG. 5) as an input means for inputting each setting data, and the buttonhole overhanging. A control circuit 110 (FIG. 4) for controlling the sewing machine 1 is provided.

The cloth retainer 15 and the cloth feed plate 14 sandwich and hold the cloth therebetween, and are driven by the Y-feed driving means 13 to feed the cloth in the front-rear direction (Y direction). As shown in FIG. 2, the cloth pressing member 15 is fixed to the connecting arm 24 connected to the cloth feeding member 23, while the cloth feeding plate 14 is directly connected to the cloth feeding member 23. The cloth feed member 23 includes a feed shaft 22 having a rack 22a.
When the Y feed pulse motor 20 rotates, the Y feed pulse motor 20 is driven via the pinion 20a to move the presser foot 15 and the cloth feed plate 14 back and forth. That is, the Y feed pulse motor 20, the feed shaft 22, the cloth feed member 23, and the connecting arm 24 constitute the Y feed drive means 13. Cloth foot 1
5 is connected to a presser foot lifting solenoid 127 (see FIG. 4). When the solenoid 127 is turned on, the cloth is oriented upward and opens the fabric, so that the solenoid 127 is OF
When it becomes F, the fabric can be clamped facing downward.

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

The needle swinging mechanism for swinging the sewing machine needle 9 to the left and right is a main needle swinging mechanism for swinging the sewing machine needle 9 with a predetermined swinging width with a certain base line as an origin, a swinging width changing mechanism for changing the needle swinging width, and It is composed of a baseline changing mechanism for changing the baseline in the left-right direction.

As shown in FIG. 3, the main needle swing mechanism includes a needle bar swinging base 18, a needle swing arm 49, a connecting shaft 48, and a connecting lever 4.
7, needle swing cam lever 46, triangular cam 35, gear 42
a, 42b and the like, the needle swing cam lever 46 is swung by a predetermined swing width by transmitting the rotational movement of the upper shaft 6 to the triangular cam 35, and this swing is transmitted to transmit the needle bar swing base. 1
By rotating 8 around the fulcrum 18a, the sewing machine needle 9 can be swung in the left-right direction. With the main needle swing mechanism,
When the sewing machine needle 9 descends the first time, the needle bar 8 is brought to the base line, and when the sewing machine needle 9 descends the second time, the needle bar 8 is brought to a position of a predetermined swing amount from the base line.

The swing width changing mechanism is configured such that the rotation of the needle swing feed pulse motor 41 causes the links 36, 37 and the connecting link 4 to move.
By changing the swing width of the needle swing cam lever 46 via 5, the swing width of the sewing machine needle 9 is changed. The baseline changing mechanism rotates the baseline changing lever 43 about the fulcrum 43a by the rotation of the baseline feed pulse motor 40, and changes the position of the fulcrum 44a of the baseline lever 44. Fulcrum 44
The reference character a determines the origin of the swing motion of the needle swing cam lever 46, and the origin of the swing motion of the needle swing cam lever 46 changes via the connecting link 45 by changing the position of the fulcrum 44a. The base line position of the needle swing of the sewing machine needle 9 is changed.

The sewing machine needle 9 is swung relative to the workpiece by the needle swinging mechanism and the Y-feed driving means 13 so that the button around the button hole of the workpiece is pressed. Perform hole stitching. In other words, by driving the Y feed drive means 13, the workpiece to be squeezed and held by the cloth presser 15 and the cloth feed plate 14 is fed in the front-rear direction (Y direction), and the sewing machine needle 9 is swung left and right by the needle swing mechanism. Side stitching is performed on the left and right parallel portions along the left and right sides of the button hole of the workpiece, and bar tacking is performed on the bartacking portions along the front and rear ends of the button hole. Also, the needle swing mechanism and Y
With the feed driving means 13, reinforcement sewing is performed on the bartacking portion after the side stitching and before the bartacking stitching. That is, the reinforcement sewing of the bar-tacking portion is performed by the Y-feed pulse motor 20 while reciprocating the cloth in the front-rear direction (Y direction) while the baseline-feed pulse motor 4
By rotating 0, the needle bar swing base 18 is moved in the left-right direction (X direction).
To move to form a seam. That is, the width of movement of the cloth presser 15 and the cloth presser plate 14 in the front-rear direction, which are reciprocated by the drive of the Y-feed pulse motor 20, becomes the needle swing width at the time of reinforcement sewing, and the needle bar swing by the drive of the base-line feed pulse motor 40. The movement width of the sewing machine needle 9 that moves via the base 18 and the needle bar 8 becomes the sewing pitch in the sewing direction of the reinforcement sewing.

The control circuit 110, as shown in FIG.
PU (Central Processing Uni)
t) 111, ROM (Read Only Memory)
y) 112, RAM (Random Access M)
113), Y feed pulse motor driver 114 for driving each pulse motor, baseline feed pulse motor driver 115, needle swing feed pulse motor driver 116, and needle thread trimming scissors for driving needle thread trimming scissors actuator (solenoid 76). An actuator driver 117, a sewing machine motor driver 119 that controls the drive of the sewing machine motor 5, a presser foot lifting solenoid driver 126 that drives and controls the presser foot lifting solenoid 127, a cylinder driver 120 that drives the cloth cutting knife lowering cylinder 19 that lowers the cloth cutting knife 16. Etc.

The sewing machine motor driver 119 includes, in addition to the sewing machine motor 5, a sewing machine motor encoder 1 which encodes the rotation amount of the sewing machine motor 5 as a rotation angle of the upper shaft 6.
21, a needle upper position sensor 122 that detects that the sewing machine needle 9 is at the upper position, and a TG that detects the rotation speed of the upper shaft 6.
A (tacho generator) generator 123 and the like are connected. Further, the CPU 111 has an operation panel 10 described later.
Presser switch 1 for instructing 0 or lifting and lowering of the work clamp 15
24, a start switch 125 for instructing the drive start of the sewing machine motor 5 and the like are connected.

The CPU 111 uses a predetermined area of the RAM 102 as a work area, and according to a control program stored in the ROM 112, data from the operation panel 100,
Each driver is controlled via each driver based on detection signals from various connected sensors. ROM 112
On the basis of the input processing from the operation panel 100 and control data for buttonhole sewing based on various sewing data input through the operation panel 100 (all needle drop positions from the start of sewing to the end of sewing, etc.). ) Is stored, and a control program including a sewing process for performing a sewing operation according to the calculated control data is stored. In the ROM 112, a range of data values that can be set and data that can be increased or decreased by one operation of the minus key 103b and the plus key 103c, which will be described later, corresponding to each of the various data items of the buttonhole stitches shown in FIG. Unit values, standard data values, etc. are stored. Furthermore, ROM1
In order to sew buttonhole overlock stitches of a predetermined shape pattern, all the data values (No. 1 to No. 12) of FIG.
A plurality of patterns set for 25) are stored. The RAM 113 serves as a work area for the CPU 111, and stores various data of buttonhole stitches input via the operation panel 100.

The operation panel (swing width setting means, pitch setting means, tension setting means, sewing speed setting means 100) is used to set and input various sewing parameters, display output of set values and display of errors in sewing control. For example, it is provided on a sewing machine table on which the buttonhole sewing machine 1 is placed. On the operation panel 100,
A start operation unit 101, a number operation unit 102, a data value input operation unit 103, and a mode switching operation unit 104 are provided. The start operation section 101 has a preparation key 101a for the operator to input that the sewing preparation is ready and reset, and an LED (Light Emit) for displaying the state.
a display unit 101b including a ting diode) and the like.

The number operation section 102 includes a number display section 102a, a down key 102b and an up key 10.
2c is provided. The number display section 102a is 2
It consists of a digit 7-segment display and displays the data item number and pattern number for inputting data values.
The down key 102b and the up key 102c are keys for shifting the numbers of data items and pattern numbers by one, the down key 102b is a key for moving down by one, and the up key 102c is a key for moving up by one.
The contents of various data items of the buttonhole stitch u0 will be described in detail later.

The data value input operation section 103 includes a data value display section 103a, a minus key 103b, and a plus key 1.
03c is provided. The data value display unit 103a is
It consists of a 4-digit 7-segment display and displays the data value of each data item. The minus key 103b and the plus key 103c are keys for increasing or decreasing the data value by a predetermined unit value. As will be described later, a predetermined unit value and a settable range are determined for each data item, and the minus key 1
When 03b is pressed, the data value is decreased by the unit value, and when the plus key 103c is pressed, the data value is increased by the unit value.

A pattern number key 1 for switching to a pattern number setting mode is provided on the mode switching operation section 104.
04a and data key 1 for switching to the data input mode
04b are provided. Pattern number key 104
Indicators 104c and 104d such as LEDs are provided on a and the data key 104b, respectively, and it is possible to inform the operator of the pattern number setting mode or the data input mode by lighting these. . First, the operator first selects the pattern number key 104.
a is operated to set the pattern number to be sewn to the pattern No. of FIG. 1, 2, 3, 4, ... Then, operate the data key 104b to select each data item,
The data value input operation unit 103 sets / changes the data value. By selecting the pattern number, the data value is set in advance for each pattern.
If the data value is acceptable, there is no need to change it.

The types and contents of sewing data that can be input from the operation panel 100 and determine the shape and size of buttonhole stitches will be described. In Figure 6,
FIG. 7 shows a data table showing the data items that can be input from the operation panel 100, and FIG. 7 is a diagram for explaining which part of the buttonhole overlock stitch u0 each data item represents. In FIG. 7, a data item name and a data number are described in each part of the buttonhole stitch u0.

The data items that can be input from the operation panel 100 for the buttonhole stitch u0 are as shown in the data table of FIG. That is, data number 1
Up to 16 are cloth cutting length data (the length of the button hole H1), which is the length of the button hole, and the female groove right width data (the button hole H1.
And the left end of the right side sewing u2), knife groove left width data (the distance between the button hole H1 and the right end of the left side sewing u1), overedging width data (the left and right width lengths of the side sewing u1 and u2), bar tacking length Data (vertical length of bartacking stitches w1 and w2), clearance data which is clearance length data (distance between the lower end of the first bartacking portion S1 and the upper end of the button hole H1) and second clearance data (second bartacking). The distance between the upper end of the portion S2 and the lower end of the button hole H1, the parallel portion pitch data (the vertical distance between the two stitches of the side stitches u1 and u2), the bar-tacking portion pitch data (the bar-tacking portions S1 and S2). Vertical distance between needles), bar-tacking width right correction data (deviation length between right ends of bar-tacking portions S1 and S2 and right end of right-side sewing u2), bar-tacking width left correction data (tacking part S
1, the left end of S2 and the left end of the left sewing u1),
Left parallel part tension data (thread tension when sewing left side sewing u1), right parallel part tension data (thread tension of right side sewing u2),
First bar-tacking portion tension data (thread tension when sewing the first bar-tacking portion S1), second bar-tacking portion tension data (second bar-tacking portion S2)
Items such as thread tension during sewing) and maximum speed limit data (maximum limit number of sewing machine rotations).

Data numbers 17 to 25 in FIG.
Is a characteristic data item in the present invention, and is reinforced sewing z
This is data regarding 1. 11 (a) to 11 (i)
As shown in, in the present invention, it is necessary to match the positions of the point P1 at the start of sewing and the point P9 at the end of sewing. In the case of sewing machine 1, data No. 17 Set the “sewing start position”. Further, in the present invention, after the left side sewing u1 is performed, the zigzag reinforcing sewing z1 is performed before the bar tacking sewing w1 of the first bar tacking portion S1 is performed. Therefore, each setting for the reinforcement sewing z1 can be determined. That is, in the sewing machine 1, the data No. 18 "1st bartacking part reinforcement sewing pitch",
No. 19, "Reinforcement sewing tension of first bar-tacking portion", No. 19 20
"First bar-tacking part reinforcement sewing length" No. 21 "1st bar-tacking part reinforcement sewing rotation speed" can be set. For example, as shown in FIG. 8, the length of D can be set as the "first bar-tacking portion reinforcement stitching pitch" and the length of C can be set as the "first bar-tacking portion reinforcement stitching length".

As for these data, each set value can be input on the operation panel 100, and No. 17 At the “sewing start position”, the origin position of the lower end of the button hole H1 (P0 shown in FIG. 11A) is set as a reference and set in 0.1 mm intervals in the range of “0.00 to 5.00” mm. It is possible. No.
18 In the "first bar-tacking portion reinforcement sewing pitch", "0.00 ~
It can be set in the range of 2.00 "mm at intervals of 0.05 mm. No. In 19 "1st bar-tacking portion reinforcing sewing tension", it is possible to set at 1 interval in the range of "0-255". No. 20 “First bar-tacking part reinforcement sewing length” is shown in FIG.
As shown in, the origin position "0" is a point separated by a predetermined distance (length A) from the point P1 at which the left side sewing u1 is finished, and 0.1 mm in the range of "0.10 to 5.00" mm. It can be set at intervals. No. 21 "1st bartacking part reinforcement sewing rotation speed" is 100s in the range of 400spm or more.
It can be set at pm intervals. When setting the reinforcement sewing w1, No. 20. The "first bar-tacking portion reinforcing sewing length" (C shown in FIG. 8) is set within a range not exceeding the bar-tacking length shown in FIG. 7 (B shown in FIG. 8).

Further, as shown in FIG. 11, after the right side sewing u2 from the point P4 to the point P5 is completed, the reinforcing sewing z2 to be performed before the bartacking w2 of the second bartacking portion S2 can be set. Reinforcing sewing w of the first bar-tacking portion S1 described in
It can be set independently of the 1st data. That is, sewing machine 1
Then, the data No. No. 22 “Second bar-tacking portion reinforcing sewing pitch”, No. 22. No. 23 “Second bar-tacking portion reinforcing sewing tension”, No. 23.
No. 24 “Second bar-tacking part reinforcement sewing length” No. 24 25 "2nd bar-tacking part reinforcement sewing rotation speed" can be set. The setting of the reinforcing stitch w2 of the second bartacking portion S2 can be set within the same range as the setting of the reinforcing stitch w1 of the first bartacking portion S1 described above.

9 to 10 show flowcharts of the respective processes performed under the control of the CPU 111 in the buttonhole sewing machine 1 having the above configuration. The flow of FIG. 9 starts, for example, when the power of the sewing machine 1 is turned on. First, in step S1, the operator operates the operation panel 1
The setting process of 00 is performed. In step S2, it is determined whether or not the preparation key 101a has been operated. If the preparation key 101a has been operated, the process proceeds to step S3, and if not, the process returns to step S1. In step S3, the operation panel 1
The process of calculating the needle drop position shown in FIG. 10 is performed based on the data set via 00, and then step S
At 4, it is determined whether the preparation key 101a has been pressed. Here, if the preparation key 101a is pressed, the process returns to step S1 again and the resetting becomes possible. If the preparation key 101a is not pressed in step S4, step S5
Move to and set the material to be sewn on the sewing machine base. And
In step S6, the start switch 125 is turned on.
It is determined whether or not When the start switch 125 is turned on by the operator's operation, the process proceeds to step S7, where the sewing process is performed. If it is determined that the start switch 125 is not turned on in step S6,
It returns to step S4.

FIG. 10 shows the needle drop position calculation (step S3).
The sub-routine will be described. Here, the sewing order will be described prior to the description of each calculation process. FIG. 11 shows the sewing sequence. FIG. 11A shows the movement from the machine origin to the sewing start position P1, and FIG. 11B shows the left side sewing u1 of the left parallel portion (left side sewing portion T1) that follows. Figure 1
1 (c) is the reinforcement stitch z1 of the first bar-tacking portion S1, FIG.
(D) is a bartacking stitch w1 of the first bartacking portion S1, FIG.
(E) is the right side sewing u2 of the right parallel portion (right side sewing portion T2),
FIG. 11 (f) shows the reinforcement stitch z2 of the second bar-tacking portion S2, FIG.
1 (g) shows movement of the needle drop position, FIG. 11 (h) shows bartacking sewing w2 of the second bartacking portion S2, and FIG. 11 (i) shows sewing end.

In the needle drop position calculation shown in FIG. 10, first, the sewing start position calculation is performed in step J1.
The needle drop position at point P1 (the sewing start position) shown in (a) is calculated. Then, in step J2, the left parallel portion (left side sewing portion T1) is calculated, and the needle drop position of the left side sewing u1 from the point P1 to the point P2 shown in FIG. 11B is calculated. Next, in step J3, the first bar-tacking reinforcement sewing operation is performed to calculate the needle drop position of the reinforcement stitch z1 of the first bar-tacking portion S1 from point P2 to point P3 shown in FIG. 11 (c).

Next, at step J4, the first bar-tacking portion calculation is performed to calculate the needle drop position of the bar-tacking stitch w1 of the first bar-tacking portion S1 from point P3 to point P4 shown in FIG. 11 (d). . Then, in step J5, the right parallel portion (right side sewing portion T2) is calculated, and the right parallel portion from the point P4 to the point P5 (right side sewing portion T shown in FIG. 11E) is calculated.
2) Calculate the needle drop position of the right side sewing u2. Next, in step J6, the second bar-tacking reinforcement sewing operation is performed, and
The needle drop position of the reinforcement stitch z2 of the second bar-tacking portion S2 from the point P5 to the point P6 shown in 1 (f) is calculated. At step J7, the second bar-tacking portion calculation is performed, and the operation shown in FIG.
And the needle drop position of the bartacking stitch w2 of the second bartacking portion S2 from the point P6 to the point P8 shown in FIG. 11 (h) is calculated. Then, in step J8, the sewing end calculation is performed to calculate the needle drop position at the point P9 shown in FIG. 11 (i). The point P9 is the same as the point P1.

In the embodiment described above, FIG.
As shown in (a) to (i), the left parallel portion (left side sewing portion T
1) starting from the lower end, performing left side sewing u1 of the left parallel portion (left side sewing portion T1), reinforcing stitch z1 of the first bar-tacking portion S1, and bar-tacking stitch w1, and then performing the right parallel portion (right-side sewing portion T2). ), The reinforcement stitch z2 of the second bar-tacking portion S2 and the bar-tacking stitch w2 are sewn in this order. As shown in FIG. 12, the stitches of the bar-tacking portions (S1, S2) are formed in a radial shape. When the bartacking portions (S1, S2) are sewn, wrinkles (excursion) are less likely to occur. In such a case, the reinforcement sewing (z1, z1) of the bartacking portions (S1, S2) is selected by the operator.
It is also possible to omit z2). Also, the bar-tacking part (S1, S
Reinforcing stitches (z1, z2) can be performed on only one of the items 2).

As described above, according to the buttonhole sewing machine 1 in the embodiment of the present invention, the bar-tacking portion (S
Before performing bar tacking sewing (w1, w2) of 1, S2),
By performing zigzag reinforcement sewing (z1, z2),
Wrinkles around the seams of the bar-tacking parts (S1, S2)
The situation in which the occurrence of the buttonhole is improved, and the buttonhole seam that is beautiful in appearance is obtained.

Further, the reinforcement stitch (z) is provided at a position separated from the end portion (P2 shown in FIG. 8) of the side stitch (u1, u2) by a predetermined distance.
1, z2), and the width of the reinforcing stitch (z1, z2) (C shown in FIG. 8) is shorter than the bar-tacking length (B shown in FIG. 8) of the bar-tacking portion (S1, S2). Since it is formed, the reinforcing stitches (z1, z2) are hidden by the bartacking stitches (w1, w2) of the bartacking portions (S1, S2), so that the finish is also visually pleasing.

[0046]

According to the invention of claim 1, after the side seam is sewn, the zigzag reinforcement sewing is performed before the bartacking of the bartacking portion. Therefore, the bartacking reinforcement is reinforced by the reinforcement sewing. The bar-tacking portion thus formed is formed, and the bar-tacking portion is formed without wrinkles. Therefore, it is possible to form a buttonhole overlaid seam that is beautiful in appearance around the buttonhole and has a high sewing quality.
Further, since the bar-tacking seams and the reinforcing seams are formed in the bar-tacking portion, the button hole which is over-sewn on the periphery is not spread and the shape of the button hole can be maintained. .

According to the second aspect of the present invention, since the reinforcing stitch is formed at a position distant from the side stitch portion, the reinforcing stitch is formed at a position close to the outer edge of the bar-tacking portion, and a wrinkle is formed around the seam of the button hole. (Dimples) can be prevented from occurring.

According to the third aspect of the present invention, the needle swing width of the reinforcement stitch is set smaller than the length of the bar tack stitch in the sewing direction by the swing width setting means, so that the reinforcement stitch is hidden by the bar tack stitch. It is formed into a beautifully finished product. In addition, since the bar-tacking length is usually longer than the pitch of the parallel part, if the needle swing width of the reinforcement sewing is the same as the bar-tacking length, the feed amount becomes large and the rotation speed of the sewing machine spindle is increased. You need to slow down. Therefore, the needle swing width can be set freely, and the cycle time can be shortened.

According to the fourth aspect of the present invention, since the stitch pitch of the zigzag stitch of the reinforcement stitch can be set freely, the optimum pitch can be selected according to the kind and thickness of the material.

According to the fifth aspect of the present invention, the tension of the sewing thread of the reinforcement sewing can be changed depending on the type and thickness of the material.

According to the sixth aspect of the invention, the sewing speed of the reinforcement sewing can be changed by the sewing speed setting means according to the kind and thickness of the material. The sewing speed at the time of reinforcement sewing is set to be slower than the sewing speed of the side stitch of the side stitch portion or the bar tack stitch of the bar tack portion.

According to the invention described in claim 7, when the shape of the bartack stitches formed by the bartack portions at the both ends is different, the optimum shape corresponding to the shape of the bartack stitches of the bartack portions is obtained. Reinforcing seams can be formed.

[Brief description of drawings]

FIG. 1 is a perspective view showing the external appearance of a buttonhole sewing machine as an example of the present invention.

FIG. 2 is a perspective view mainly showing a cloth feed mechanism and a needle raising / lowering mechanism of the buttonhole sewing machine of FIG.

FIG. 3 is a perspective view mainly showing a needle lifting mechanism and a needle swing mechanism of the buttonhole sewing machine of FIG.

FIG. 4 is a block diagram showing a control circuit of the buttonhole sewing machine of FIG. 1.

FIG. 5 is a front view of an operation panel.

FIG. 6 is a data table showing parameters that can be input from the operation panel.

FIG. 7 is a diagram illustrating the correspondence between each data item in FIG. 6 and buttonhole overedging.

FIG. 8 is a view showing a state in which reinforcement work is performed on a bartacking portion.

FIG. 9 is a flowchart showing a process from input of parameters on the operation panel to sewing.

FIG. 10 is a diagram showing the needle drop position calculation of FIG. 9;

FIG. 11 is a diagram showing a state from the start of sewing to the end of sewing of overlock stitching.

FIG. 12 is a view showing a state in which the shape of the bartacking stitch of the bartacking portion is radial.

[Explanation of symbols]

1 Buttonholing sewing machine 5 Sewing machine motor 6 Upper shaft (spindle) 9 Sewing needle 13 Y feed drive means 15 Cloth presser (cloth holding means) 16 Cloth cutting knife 100 Operation panel (swing width setting means, pitch setting means, tension setting means) , Sewing speed setting means) 110 control circuit 111 CPU (control means) 112 ROM 113 RAM H1 button hole S1 first bar-tacking section S2 second bar-tacking section T1 left side sewing section (left parallel section) T2 right side sewing section (right parallel) Part) u1 left side sewing u2 right side sewing w1, w2 bartacking z1, z2 reinforcement sewing

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) D05B 69/18 D05B 69/18 Z 69/22 69/22 BF term (reference) 3B150 AA24 BA06 CB03 CB14 CB26 CD01 CE01 CE03 CE23 DB03 EB03 EE03 EE08 EE13 FD07 GD11 GD14 GD22 GF02 GF03 JA02 JA03 JA07 JA11 LA05 LA07 LA15 LA29 LA51 LA59 LA60 LA71 LA72 LA73 LA85 LA90 LB01 LB02 MA02 MA07 MA08 NA05 NA07 NA09 NA14 NA28 NA47 NA48 NA55 NA56 NA72 NA77 NB02 NB03 NB12 NB15 NB18 NC02 NC03 NC06 NC11 QA01 QA06 QA07 QA08

Claims (7)

[Claims] 1. A sewing machine needle that moves up and down with respect to a sewing object by rotation of a main shaft, a cloth pressing means that presses the sewing object, and a cloth cutting knife that is provided near the sewing machine and that can move up and down. The sewing machine needle and the cloth pressing means are moved so that the sewing machine needle swings relative to the sewing object, so that the left and right sides of the button hole cut and formed by the cloth cutting knife are formed. In a buttonhole overlock sewing machine that forms buttonhole overlock stitches in a pair of side stitches along the side and a bar-tacking portion that is located at least one end side of the buttonhole and is continuous with the side stitch, the pair of side stitches is provided. After the side stitching of at least one of the side stitching portions and before the bar tacking stitching of the bar tacking portion, the needle swinging is performed substantially parallel to the stitching direction of the bar tacking stitch so that the stitching direction of the bar tacking stitch is Orthogonal sewing Buttonholing machine, characterized in that the reinforcement stitching countercurrent zigzag with a control means for forming control to allow the tacking portion. 2. The buttonhole sewing machine according to claim 1, wherein the control means forms the reinforcing stitch on the bartacking portion at a position apart from the pair of side stitching portions. 3. A swing width setting means for setting a needle swing width at the time of reinforcement sewing, and the needle swing width at the time of reinforcement sewing set by the swing width setting means is a bartack with which the reinforcement stitch is formed. The buttonhole sewing machine according to claim 1 or 2, wherein the bar-tacking stitch of the portion is smaller than the length in the sewing direction. 4. A pitch setting means for setting a sewing pitch of the reinforcement sewing is provided.
Buttonhole sewing machine described in any one of. 5. The tension setting means for setting the tension of the sewing thread of the reinforcement sewing is provided.
Buttonhole sewing machine described in any one of. 6. A sewing speed setting means for setting the sewing speed of the reinforcement sewing is provided.
Buttonhole sewing machine described in any one of. 7. The reinforcing stitches are bar-tacking portions which are continuous with the pair of both-side stitched portions and which are respectively located at both end sides of the button hole, and are controlled so that they can be individually formed. The buttonhole sewing machine according to any one of claims 1 to 6.