JP2002282568A - Buttonhole sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buttonhole sewing machine capable of performing a buttonhole sewing from an optional sewing position to a cloth presser. SOLUTION: This buttonhole sewing machine 1 is provided with an operation panel 100 for inputting and setting the shape and sewing position of buttonholing, a RAM 113 for storing the data inputted from the operation panel 100, and a control means for reading the data and relatively moving a sewing needle 9 and a cloth pressing means by a Y-feed driving means 13 and a needle swinging mechanism so as to form the buttonholing from the sewing position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A buttonhole overlock sewing machine that forms a buttonhole on a workpiece and performs overlocking around the buttonhole is known. In a buttonhole overlock sewing machine, an upper thread passed through a sewing needle and a lower thread wound around a bobbin in a shuttle device are fed while a workpiece held by a cloth presser or the like is fed in a predetermined direction by a cloth feed mechanism. To form a seam. The sewing machine is provided with a thread cutting device that cuts each of an upper thread and a lower thread after forming a seam. Conventional upper and lower thread cutting devices are configured to cut a thread in conjunction with a mechanism that raises a presser foot. After cutting, the upper thread and the lower thread are held in a state sandwiched by scissors, and when the next sewing is started, the scissors are opened at a certain timing by mechanically interlocking with the cloth feed mechanism, whereby the seam is naturally It was configured so that the yarn end was wound inside. That is, in the conventional buttonhole overlock sewing machine, when the cloth feed plate of the cloth feed mechanism moves to a certain position after the start of sewing, the upper thread and the lower thread are released.

[0003]

Therefore, if the sewing is started from a predetermined position, the overlock stitch is performed while moving the cloth feed plate, and the sewing is completed at a position different from the sewing start position, the cloth feed plate or the cloth The feed mechanism has not mechanically returned to its original state. If the next sewing is started in that state, the timing of releasing the scissors will be shifted, the length of the thread end remaining on the fabric cannot be controlled, and the operation of winding the thread end into the seam will also be defective, causing a problem. Sometimes occurred. Also, for example, when cutting the upper thread and the lower thread at the open position of the upper thread and the lower thread,
When the operation lever is returned to its original position, the upper thread and the lower thread are released, which causes a problem that thread holding failure occurs and sewing in the next cycle cannot be performed. For this reason, the sewing end position must be matched with the sewing start position, which is a problem. For example, a buttonhole overlock sewing machine in recent years is electronically controlled and has many variations of a sewing shape pattern. It is necessary to perform abandon sewing to the position, the seam becomes complicated by that amount, and the sewing quality decreases,
There was a problem that the cycle time increased.

[0004] It is an object of the present invention to provide a buttonhole sewing machine which can satisfy various sewing demands.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, the invention according to claim 1 is, for example, as shown in FIGS. A sewing needle (9) that moves up and down with respect to the workpiece by rotation, a shuttle (12) below the workpiece and supplies a lower thread, and a cloth presser (cloth presser 15, Cloth feed plate 14)
A moving means (Y feed driving means 13 and a needle swing mechanism) for relatively moving the sewing machine needle and the cloth presser means so as to form a buttonhole around the buttonhole; Input means for inputting a sewing position (data No. 23) as an origin position of the buttonhole buttonhole sewing, storage means (RAM113) for storing the buttonhole keyhole sewing data and the sewing position inputted from the input means, and storage. When the buttonhole buttonhole sewing data and the sewing position stored in the means are read out and the buttonhole buttonhole sewing is formed, the sewing machine needle and the cloth presser means are relatively moved by the moving means, and the origin position is read out. A buttonhole stitching sewing machine comprising a buttonhole stitching control means (CPU 111) for setting a buttonhole stitching position.

According to the first aspect of the present invention, the buttonhole sewing data and the sewing position are inputted through the input means, and the buttonhole sewing can be arbitrarily performed under the control of the control means. It can be formed at the sewing position. As described above, according to the first aspect of the invention, the sewing position with respect to the presser foot can be changed. Thus, an appropriate sewing state can be prepared. For example, this is useful when there is a step or a cut in the fabric near the buttonhole stitch forming and it is desired to press the cloth with a cloth presser while avoiding them.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. <First Embodiment> A buttonhole overlock sewing machine 1 as an example of the present invention includes a bed portion 2, a vertical trunk portion 3, and an arm portion 4. The sewing machine 1 includes a sewing needle 9 for raising and lowering and swinging the needle to the left and right, a cloth presser 15 for holding a cloth (a material to be sewn), holding the cloth on the lower side, and moving back and forth in the cloth feeding direction (Y direction). The upper thread cutting device 70 (FIG. 4) for cutting the upper thread above the cloth feed plate 14 and the presser foot 15, the lower thread cutting device 50 for cutting the lower thread below the needle plate 55 (FIG. 8), A cloth cutting knife 16 for cutting to form a buttonhole, an operation panel 100 (FIG. 10) as an input means for inputting each setting data, and a control circuit 110 for controlling the buttonhole overlock sewing machine 1 (FIG. 10). 9) and the like.

A presser foot 15 constituting the presser foot means of the present invention.
The cloth feed plate 14 holds the cloth therebetween, and is 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 presser 15 is fixed to a connection arm 24 connected to the cloth feed member 23, while the cloth feed plate 14 is directly connected to the cloth feed member 23. This cloth feed member 23 is
Y is fixed to a feed shaft 22 having a rack 22a.
When the feed pulse motor 20 rotates, the feed pulse motor 20 is driven via the pinion 20a to move the cloth presser 15 and the cloth feed plate 14 back and forth. That is, the Y-feed pulse motor 20, the feed shaft 2
2. The Y-feed drive means 13 is constituted by the cloth feed member 23 and the connecting arm 24. As shown in FIG. 4, a closing plate 25 to be described later is fixed to the distal end of the connecting arm 24, and the cloth presser 15 is further fixed to the front side. The presser foot 15 is connected to a presser lifting solenoid 127 (FIG. 9) via a presser bar 27 and the like. The fabric can be pinched downward and clamped. Foot 15 driven by solenoid
Since the configuration is well known, the details are omitted.

The lifting mechanism for raising and lowering the sewing needle 9 is shown in FIG.
3, an upper shaft (main shaft) 6, a sewing machine motor 5, a crank cam 7, and the like. Thus, the sewing needle 9 is moved up and down.
The upper shaft 6 is linked to a lower shaft 11 via a connecting shaft 10 having umbrella wheels 10a and 10b arranged at upper and lower ends, and is linked to a shuttle 12 connected to the lower shaft 11.

The needle swing mechanism for swinging the sewing machine needle 9 right and left includes a main needle swing mechanism for swinging the sewing machine needle 9 at a predetermined swing width with a certain base line as an origin, a swing width changing mechanism for changing the needle swing width, and It comprises a 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 swing table 18, a needle swing arm 49, a connecting shaft 48, and a connecting lever 4.
7, needle swing cam lever 46, triangular cam 35, gear 42
a, 42b, etc., by transmitting the rotational movement of the upper shaft 6 to the triangular cam 35, the needle swing cam lever 46 is swung with a predetermined swing width, and this swing is transmitted to transmit the swing to the needle bar swing table. 1
The sewing needle 9 is swung in the left-right direction by rotating the sewing machine 8 around the fulcrum 18a. In the main needle swing mechanism,
At the timing when the sewing needle 9 descends for the first time, the needle bar 8 is moved to the base line, and at the timing when the sewing needle 9 descends for the second time, the needle bar 8 is moved to a position of a predetermined swing width from the baseline.

The swing width changing mechanism operates the links 36 and 37 and the link 4 by rotating the needle swing feed pulse motor 41.
5, the swing width of the sewing needle 9 is changed by changing the swing width of the needle swing cam lever 46. The base line changing mechanism changes the position of the fulcrum 44a of the base line lever 44 by rotating the base line changing lever 43 about the fulcrum 43a by the rotation of the base line feed pulse motor 40. Fulcrum 44
a determines the origin of the swinging motion of the swinging cam lever 46. When the position of the fulcrum 44a changes, the origin of the swinging motion of the swinging cam lever 46 changes via the connection link 45. The base line position of the swing of the sewing machine needle 9 is changed. The moving means of the present invention is constituted by the above-described needle swing mechanism and the Y feed driving means 13.

An upper thread cutting device (upper thread cutting means) 70 and a lower thread cutting device (lower thread cutting means) 50 are provided near the sewing needle 9.
Is provided. The upper thread cutting device 70 will be described with reference to FIGS. The upper thread cutting device 70 includes an upper thread cutting scissors 80, and operates the scissors 80 to cut, hold, and release the upper thread. As shown in FIGS. 4 and 5, a closing plate 25 is fixed to the distal end 24 a of the connecting arm 24.

The upper thread cutting device 70 is, as shown in FIG.
An upper thread cutting section 71 for performing an upper thread cutting operation;
And an upper thread cutting drive unit 72 that drives The upper thread cutting section 71 includes an openable and closable upper thread cutting scissor 80, a support arm 81 that supports the upper thread cutting scissor 80, and a shaft 82 to which the support arm 81 is attached at a tip end. The shaft portion 82 passes through a bearing 84 rotatably connected to shaft support portions 83 fixed to the lower portion of the arm portion 4, and is slidable and rotatable with respect to the bearing 84. ing. A support arm 81 is fixed to the distal end of the shaft 82, and an upper thread trimming scissor 80 is attached to the distal end 81 a of the support arm 81 so as to be directed toward the work clamp 15. The upper thread cutting scissors 80 include a fixed blade 85 (FIG. 4) to which a pressing plate 85a is attached, and a movable blade 86 provided rotatably about a pin 86b with respect to the fixed blade 85. Is provided with a cam contact portion 86a protruding from the upper surface thereof.

Next, the upper thread cutting drive section 72 will be described. The upper thread cutting drive unit 72 is
Upper thread cutting scissors closing means for performing an operation of closing the upper thread cutting scissors 80 (operation of cutting the upper thread) and upper thread cutting scissors for performing an operation of opening the upper thread cutting scissors 80 (an operation of releasing the upper thread). Opening means.

First, the structure of the upper thread cutting scissors closing means will be described in detail. The base end (right end) of the operation lever 87 is attached to the vertical trunk 3 so as to be rotatable around an axis in the front-rear direction. One end of a tension spring 31 is connected to an intermediate portion of the operation lever 87, and the other end of the tension spring 31 is hung on the arm 4. The tension spring 31 urges the operation lever 87 in a clockwise rotation direction (a direction opposite to the arrow d shown in FIG. 5). The operation lever 87 is
The operator may directly operate, or an actuator for driving the operation lever 87 may be provided, and when the operator operates a switch or the like, the operation lever 87 may be rotated via the actuator.

A roller mounting portion 88 is fixed to the base end of the operation lever 87 upward, and a roller 89 is provided at the upper end of the roller mounting portion 88. The oscillating body 28 is provided so as to contact the roller 89. Oscillator 28
Is mounted on the arm 4 such that its base end (right end) is rotatable about a vertical axis.
Further, a cam 28a is formed on the rear surface of the oscillating body 28, and a roller 89 contacts the cam 28a. Then, the front part of the rocking body 28 contacts the upper part of the rotating arm 29. The upper part of the rotating arm 29 is fixed to the rear end of the shaft 82. A compression spring 30 is provided between the rotating arm 29 and the bearing 84.
Is inserted through the shaft 82. The compression spring 30 urges the shaft portion 82 rearward together with the rotating arm 29.

A cam member 3 is provided at an intermediate portion of the operation lever 87.
2 is connected so that it can rotate freely about the axis in the front-rear direction. The left end of the cam member 32 is rotatably connected to an intermediate portion of the lower thread cutting lever 33. The lower thread cutting lever 33 is provided to be long in the vertical direction, and the lower part thereof faces the inside of the bed 2. Lower thread cutting lever 3
The upper end of 3 is attached to the vertical body 2 so as to be rotatable around an axis in the front-rear direction. Lower thread cutting lever 3
A pressing body 34 is fixed to an intermediate portion of the third member 3. The distal end 34a of the pressing body 34 extends rightward, and an engaging / disengaging member 73 is provided near the distal end 34a.

The engagement / disengagement member 73 includes a support 73a, an engagement / disengagement body 73b, and a compression spring 73d (FIG. 7). The support 73a is formed in a hook shape in cross section, and the base 24 of the connecting arm is formed.
a. The engaging / disengaging body 73b is rotatably connected to the support 35a. A locking portion 73c that bends upward is formed at the tip of the engagement / disengagement body 73b. A compression spring 73d is attached between the support 73a and the engagement / disengagement body 73b.
The engagement body 73b is urged upward with respect to a. Here, the tip portion 34a of the pressing body 34 is close to the upper side of the engagement / disengagement body 73b. When the lower thread cutting lever 33 rotates clockwise as viewed from the front, the distal end portion 34a of the pressing body 34 pushes the engagement / disengagement body 73b downward against the compression spring 73d.

On the other hand, a roller 74
Is provided. Further, one end of a tension spring 75 is hooked immediately above the roller 74 of the rotating arm 29, and the other end of the tension spring 75 is hooked on the upper end of the lower thread cutting lever 33. The tension spring 75 urges the rotating arm 29 clockwise as viewed from the front. Then, the roller 74 is moved to the cam member 32.
The cam portions 32a and 32b formed on the right side of the camshaft are in contact with each other. Thereby, clockwise rotation of the rotating arm 29 is suppressed. Here, the cam portion 32a and the cam portion 3
A corner 32c is formed at the right end of the cam member 32 by 2b. At the lower end of the rotating arm 29, a locking claw 29a protruding forward is provided. This locking claw 2
9a can be locked to the locking portion 35c of the engagement / disengagement body 73b.

Next, the means for releasing the upper thread cutting scissors will be described. The upper thread trimming scissors releasing means is the upper thread trimming scissors 8
Upper thread trimming scissors release driving means for opening the upper thread 0 and upper thread trimming scissors moving means for moving the upper thread trimming scissors 80 from the second standby position after the cutting is completed to the first standby position. .

The upper thread trimming scissors release driving means includes a solenoid 76 which is an actuator of the present invention, and a lever 7 which is rotatably attached to the support arm 81 at an intermediate portion.
7 and a tension spring 78 for urging the lever 77.
The solenoid 76 is fixed to a lower portion of the arm 4 and moves a rod 76a extending forward and backward and forward. The front end of the rod 76a contacts one end of the lever 77. A tension spring 78 is attached to the lever 77.
Is hooked, and the other end of the tension spring 78 is hooked in the sewing machine frame. And the tension spring 7
8 urges the rod 76 a rearward together with one end of the lever 77. At the other end of the lever 77, an opening cam portion 77a extending rightward is formed. The opening cam portion 77a is disposed to the left of the cam contact portion 86a.
At the right end of the opening cam portion 77a, a first cam surface 77b,
A second cam surface 77c is formed.

Then, the scissors 80 are opened by the upper thread cutting scissor opening driving means as follows. When the upper thread trimming scissors 80 are closed, the solenoid 76 changes from the Off state to On.
In this state, the rod 76a is pushed forward against the tension spring 78. As a result, the lever 77 rotates counterclockwise (the direction of the arrow f in FIG. 5). With the rotation of the lever 77, the second cam surface 77c comes into contact with the cam contact portion 86a, and when the lever 77 further rotates, finally, the first cam surface 77b comes into contact with the cam contact portion 86a. As a result, the cam contact portion 86a is pushed by the opening cam portion 77a, the movable blade 86 rotates (in the direction of arrow g in FIG. 4), and the upper thread cutting scissors 80 open. When the solenoid 76 is turned off, the tension spring 78 and the rod 76a return to their original states, but the upper thread cutting scissors 80 remain open.

The upper thread cutting scissors moving means includes a solenoid 7
9, a link member 90 connected to the tip of the rod 79a of the solenoid 79, and a pressing member 9 connected to the link member 90.
1 and a tension spring 75. The solenoid 79 is fixed to the upper part of the bed 2 (FIG. 7). Solenoid 7
The rod 79a protrudes rightward from the body 9 so as to be able to advance and retreat. One end of a link member 90 is connected to the tip of the rod 79a so as to be rotatable up and down. The proximal end of the pressing body 91 is rotatably connected to the other end of the link member 90. The pressing body 91 is attached to the vertical trunk portion 3 so as to extend in the vertical direction from the base end thereof, bend rightward, and be rotatable at an intermediate portion thereof.
The distal end portion 91a of the pressing body 91 is
Close to the upper surface of.

When the locking claw 29a is located below the locking portion 73c of the engaging / disengaging member 73 and the locking claw 29a is locked to the locking portion 73c by the urging force of the tension spring 75, The upper thread cutting scissor moving means moves the scissors 80 after releasing the upper thread as follows. That is, the solenoid 79
Is changed from the Off state to the On state, the rod 79a is pulled to the left (in the direction of the arrow e in FIG. 5). Thereby, the pressing body 91 rotates clockwise when viewed from the front. Pressing body 91
The tip 91a of the pressing body 91 is disengaged with the
Press b downward. As a result, the engagement / disengagement body 73b rotates clockwise, and the engagement between the engagement portion 73c and the engagement claw 29a is released. When the locking is released, the turning arm 29 rotates clockwise together with the shaft 82 by the urging force of the tension spring 75. The rotation of the rotation arm 29 and the shaft 82 causes the support arm 8 to rotate.
The upper thread trimming scissors 80 attached to the front end of the first one moves from the second standby position to the first standby position further to the left. At this time, the rotation of the rotating arm 29 stops when the roller 74 comes into contact with the cam member 32.

Next, the structure of the lower thread cutting device 50 will be described with reference to FIGS. The lower thread cutting device 50 includes:
Needle plate base 51, lower thread cutting scissors 52 provided on the lower surface of needle plate base 51, lower thread cutting scissors closing means 53 for closing lower thread cutting scissors 52 in an open state, and closed state And a lower thread trimming scissors releasing means 54 for opening the lower thread trimming scissors 52 in an open state. Needle plate base 51
Is a plate-shaped member fixed in the bed portion 2, and a needle plate 55 is fixed on an upper surface thereof. On the needle plate 55,
An insertion hole for inserting the sewing needle 5 is formed, and a shuttle device is provided below the needle plate base 51.

The lower thread cutting scissors 52 include an upper knife 56, a lower knife 57, and a leaf spring 58. The upper knife 56 is provided below the lower knife 57, but the lower side is referred to as the upper knife 56 for convenience based on FIG. Lower knife 57
Is attached to a front portion of the lower surface of the needle plate base 51 so as to be rotatable in a substantially horizontal plane at a base end portion 57a. The upper knife 56 is attached so as to be rotatable with respect to the lower knife 57. The upper knife 56 is provided with a pin 56a so as to protrude downward. An extension 56b extending forward is formed at a front portion of the upper knife 56. The leaf spring 58 is fixed to the lower knife 57.

Next, the structure of the lower thread cutting scissor closing means 53 will be described. The lower thread cutting scissor closing means 53 includes a driving arm 60, a link member 61, and a lower thread cutting link 62.
, A lower thread reeling arm 63 for reeling a lower thread from a bobbin, a link member 64, and a link member 65. A ball pin 59 extending forward is provided at a lower end of the lower thread cutting lever 33. The rear end of the drive arm 60 extending forward and backward is ball-joined to the ball pin 59. The drive arm 60 is provided in the bed portion 2 so as to be rotatable about a vertical axis at an intermediate portion thereof.

The front end of the drive arm 60 is connected to the left end of the link member 61, and the other end of the link member 61 is connected to the rear end of the lower thread cutting link 62. Lower thread cutting link 62
Is attached to the lower surface of the needle plate base 51 so as to be rotatable at an intermediate portion thereof. Lower thread cutting link 62
An intermediate portion of the lower thread reeling arm 63 is attached to the leading end of the link member 64 so as to be rotatable, and one end of a link member 64 is further rotatable with respect to the intermediate portion of the lower thread reeling arm 63. connect. The other end of the link member 64 is rotatably connected to the lower knife 57. One end of a link member 65 is connected to the rear end of the lower thread reeling arm 63 so as to be rotatable.
The other end of the link member 65 is connected to the needle plate base 51 so as to be rotatable.

The opened lower thread cutting scissors 52 are closed by the lower thread cutting scissors closing means 53 as follows. That is, when the drive arm 60 rotates in a state in which the lower thread cutting scissors 52 in FIG. The lower knife 57 rotates forward around its base end 57a via the lower thread cutting link 62, lower thread hand reeling arm 63 and link member 64. This allows
The upper knife 56 moves forward together with the lower knife 57, and the extension 56 b of the upper knife 56 abuts on the edge 51 b defining the opening 51 a of the needle plate base 51. Then, the forward movement of the upper knife 56 is suppressed, and the lower knife 57 further rotates forward, so that the tip of the upper knife 56 and the tip of the lower knife 57 match, the lower thread cutting scissors 52 are closed, and the bobbin is closed. Cut the lower thread derived from. Further, when the lower thread cutting scissors 52 are closed, the lower thread is held by the leaf spring 58 and the upper knife 56.

The lower thread cutting scissors releasing means 54 is for opening the lower thread cutting scissors 52 by pushing the pin 56a. The lower thread cutting scissors releasing means 54 includes a solenoid 66 which is an actuator of the present invention, a link member 67, an operating member 68, and a tension spring 69. Solenoid 6
Reference numeral 6 denotes a member fixed to the bed portion 2 for moving a rod 66a, which is an output shaft thereof, forward and backward. Rod 6
The rear end of the link member 67 is connected to the front end of 6a so as to be rotatable in a substantially horizontal plane. An operating member 68 is rotatably connected to the front end of the link member 67. Further, one end of a tension spring 69 is connected to one end of the operating member 68. The operating member 68 has an extension pin 68a rotatably connected to the needle plate base 51 at the other end and extending from the other end so as to be able to abut on the pin 56a. The other end of the tension spring 69 is fixed to the bed 2 and urges the operating member 68 clockwise as viewed from below (in FIG. 8).

Then, the scissors 52 release the lower thread by the lower thread cutting scissor releasing means 54 as follows. When the solenoid 66 changes from the Off state to the On state, the rod 66
a is extruded. As a result, the operating member 68 rotates counterclockwise against the tension spring 69, and the extending pin 68a of the operating member 68 pushes the pin 56a. When the pin 56a is pressed in a state where the extension portion 56b is not in contact with the edge portion 51b (that is, the upper knife 56 can move forward), the upper knife 56 rotates forward with respect to the lower knife 57. Thereby, the lower thread cutting scissors 52 open and release the held lower thread. Then, the solenoid 66 changes from the On state to O
In the ff state, the operating member 68 rotates clockwise by the urging force of the tension spring 69.

The operation of the upper thread cutting device 70 and the lower thread cutting device 50 having the above-described configurations will be described. During sewing of the sewing machine, the upper thread cutting device 70 and the lower thread cutting device 50 are in an initial state shown by a solid line in FIG. That is, 1. The operation lever 87 is set to A by the urging force of the tension spring 31.
In the position. 2. The shaft 82 and the rotating arm 29 are located rearward by the urging force of the compression spring 30. 3. As shown in FIG.
Clockwise rotation of the cam member 32 is suppressed by the contact of the roller 74 with the cam portion 32b of the cam member 32. 4. The solenoid 79 is in the OFF state, and the pressing body 91 is not pressing the engagement / disengagement body 73b downward. The pressing body 34 does not press the engagement / disengagement body 73b downward. 5. The locking claw 29a is located on the upper surface side of the engaging and disengaging body 73b. 6. The solenoid 76 is off, and the upper thread trimming scissors 8
Reference numeral 0 denotes an open state, and is located at a first standby position (a position obliquely left behind the vertical trajectory of the sewing needle 9 when viewed from above). 7. The solenoid 66 is off, and the lower thread cutting scissors 5
2 is open. 8. The extension 56b of the upper knife 56 is provided at the edge 51 of the needle plate base 51.
The lower thread trimming scissors 52 are not in contact with b and are in the initial position.

When the operator operates the operation lever 87 after finishing the buttonhole buttonhole sewing, the operation lever 87 rotates counterclockwise (in the direction of the arrow d in FIG. 5) around the base end thereof, and as shown in FIG. Rotate to position B. During this movement, the needle thread cutting device 70 operates as follows. That is, when the roller 89 moves along the cam 28a of the rocking body 28 due to the counterclockwise rotation of the operation lever 87, the rocking body 28 rotates forward. Thus, the rocking body 28 pushes the shaft 82 together with the rotating arm 29 forward. By moving the shaft portion 82 forward, the upper thread cutting scissors 80 move forward.

On the other hand, the rotation of the operation lever 87 causes the cam member 32 to rotate clockwise in FIG. 7 around its left end. By the rotation of the cam member 32, the lower thread trimming lever 33 rotates clockwise around its upper end, and the cam portion 32b pushes the roller 74 to the right. With the rotation of the lower thread cutting lever 33, the pressing body 34 presses the engagement / disengagement body 73b downward. On the other hand, when the roller 74 is pressed to the right, the shaft 82 rotates counterclockwise in FIG. Here, when the pressing body 34 presses the engagement / disengagement body 73b downward, the engagement / disengagement body 73b is
9a no longer interferes with the movement. The shaft 82 rotates counterclockwise until the roller 74 contacts the corner 32c of the cam member 32. The counterclockwise rotation of the shaft 82 moves the upper thread cutting scissors 80 to the right cutting position.

When the upper thread cutting scissors 80 start moving from the first standby position toward the cutting position, the cam contact portion 86a of the movable blade 86 comes into contact with the closing plate 25, and the cam contact portion 86a
Are relatively pressed by the closing plate 25. This allows
The movable blade 86 rotates counterclockwise with respect to the fixed blade 85 when viewed from above. The rotation of the movable blade 86 closes the upper thread cutting scissors 80 to cut the upper thread, and holds the upper thread connected to the sewing needle 9.

Further, when the operation lever 87 is further operated from the position B to the position C, the upper thread cutting device 70 operates as follows. That is, the roller 89 passes over the peak of the cam 28a of the rocking body 28, and the rocking body 28 is not pushed forward. As a result, the urging force of the compression spring 30 causes the shaft portion 82 and the rotating arm 29 to return rearward, and the upper thread cutting scissors 80 move rearward in a closed state. On the other hand, the rotation of the operation lever 87 causes the cam member 3 to rotate.
2 rotates clockwise around its left end. Due to the rotation of the cam member 32, the lower thread trimming lever 33 further rotates clockwise, and the roller 74 that contacts the corner 32c.
Comes into contact with the cam portion 32a. When the roller 74 comes into contact with the cam portion 32a, the shaft 82 along with the rotating arm 29 slightly rotates clockwise when viewed from the front by the urging force of the tension spring 75. By the clockwise rotation of the shaft portion 82, the upper thread cutting scissors 80 slightly move to the left in a closed state.

Here, the operation lever 87 is moved from the position A to the position C.
The lower thread cutting device 50 operates as follows during the movement to the position. As described above, the rotation of the operation lever 87 causes the lower thread cutting lever 33 to rotate clockwise about its upper end. The clockwise rotation of the lower thread cutting lever 33 causes the drive arm 60 to rotate clockwise about its intermediate portion in FIG. By the clockwise rotation of the drive arm 60, the lower thread trimming link 62
However, it rotates counterclockwise around the intermediate portion. Due to the counterclockwise rotation of the bobbin thread cutting link 62, the bobbin thread reeling arm 63 rotates counterclockwise around its intermediate portion. The lower thread hand reeling arm 63 reels a lower thread derived from the bobbin by rotating counterclockwise. On the other hand, the lower thread cutting link 62
Causes the lower knife 57 to rotate clockwise about its base end. When the lower knife 57 is rotating, the extending portion 56b of the upper knife 56 contacts the edge 51b of the needle plate base 51, and the rotation of the upper knife 56 stops, while the lower knife 57 continues to rotate. As a result, the lower thread cutting scissors 52 cut the lower thread hand-wound by the lower thread hand-pulling arm 63. The lower thread cutting scissors 52 in a closed state hold the lower thread connected to the bobbin after cutting.

Then, when the operator releases the operation lever 87, the operation lever 87 returns to the position A by the urging force of the tension spring 31. At this time, the upper thread cutting device 70 operates as follows. The rotation of the operation lever 87 returns the roller 89 to the initial position. Thereby, the rocking body 28 once rotates forward, then rotates backward, and returns to the initial state.
With the rotation of the rocking body 28, the shaft portion 82 and the rotating arm 2
9 also moves forward once, then moves backward and returns to the initial state. Therefore, the positional relationship before and after the upper thread cutting scissors 80 becomes the same as the first standby position.

On the other hand, when the operation lever 87 returns, the cam member 32 rotates counterclockwise (FIG. 7) around its left end. As the cam member 32 rotates, the lower thread trimming lever 33 rotates counterclockwise about its base end. As the lower thread cutting lever 33 rotates counterclockwise, the pressing body 34
Releases the pressing on the disengagement body 73b, and the disengagement body 73b returns to the initial state. On the other hand, in accordance with the rotation of the cam member 32 in the counterclockwise direction, while the roller 74 moves from the cam portion 32a to the corner portion 32c and the cam portion 32b, the rotating arm 29
5 rotates clockwise by the urging force. Accordingly, the upper thread cutting scissors 80 move to the left via the shaft 82. Here, when the roller 74 moves to the cam portion 32b, since the engaging and disengaging body 73b is returned to the initial state, the engaging claw 29a of the rotating arm 29 engages with the engaging portion 35c of the engaging and disengaging body 73b. Stop. Thereby, the clockwise rotation of the rotating arm 29 is suppressed,
The contact between the roller 74 and the cam portion 32b is released. Therefore,
The movement of the upper thread cutting scissors 80 to the left also stops.

As described above, when the operating lever 87 returns from the position C to the position A, the front and rear positional relationship of the upper thread cutting scissors 80 returns to the first standby position, but the left and right positional relationship. Does not return. This position is the second standby position after the end of the cutting described above. The upper thread cutting scissors 80 at the second standby position are closed and hold the upper thread.

Here, the operation lever 87 is moved from the position C to the position A
The lower thread cutting device 50 operates as follows until it rotates to the position. As described above, the rotation of the operation lever 87 causes the lower thread cutting lever 33 to rotate counterclockwise about its upper end. Due to the counterclockwise rotation of the lower thread cutting lever 33, the drive arm 60 rotates counterclockwise about a middle portion thereof when viewed from the bottom. The counterclockwise rotation of the drive arm 60 causes the lower thread cutting link 62 to rotate clockwise about the intermediate portion thereof via the link member 61.
The clockwise rotation of the bobbin thread cutting link 62 causes the bobbin thread reeling arm 63 to rotate clockwise around its intermediate portion, returning to the initial state. On the other hand, the clockwise rotation of the lower thread cutting link 62 causes the lower knife 57 to rotate counterclockwise about the base end of the upper knife 56 together with the upper knife 56 so that the extension 5
The contact between 6b and the edge 51b of the needle plate base 51 is released.
Thereby, the lower thread cutting scissors 52 return to the initial position in the closed state.

Next, when the start switch 125 is operated by the operator, the sewing machine starts sewing in the next cycle. After the sewing start of the sewing machine, the upper thread cutting device 70 and the lower thread cutting device 50 operate as follows. In the upper thread cutting device 70, the solenoid 76 is changed from the Off state to the On state, and the lever 77 is rotated counterclockwise (FIG. 5).
F direction). With the rotation of the lever 77, the second cam surface 77c contacts the cam contact portion 86a, and the cam contact portion 86a finally contacts the first cam surface 77b. Accordingly, the opening cam portion 77a (the second cam surface 77c and the first cam surface 77b) pushes the cam contact portion 86a, and the movable blade 86 rotates clockwise (g direction) as shown in FIG. Thereby, the upper thread cutting scissors 80 are opened, and the upper thread cutting scissors 80 release the held upper thread. When the solenoid 76 is turned off after the upper thread cutting scissors 80 are opened, the rod 76a and the lever 77 return to the original state, but the upper thread cutting scissors 80 remain open.

Thereafter, the solenoid 79 changes from the off state to the on state, and the rod 79a moves leftward (direction e in FIG. 5).
Is drawn to. As a result, the pressing body 91 rotates and the disengagement body 7
3b is pressed downward, and the locking claw 29a and the disengagement body 73 are pressed.
The lock with b is released. Thereby, the tension spring 75 is moved until the roller 74 comes into contact with the cam portion 32b of the cam member 32.
The turning arm 29 is rotated clockwise by the urging force of. The shaft 82 rotates with the rotation of the rotating arm 29, and the upper thread cutting scissors 80 move to the left, and finally return to the first standby position. After the upper thread cutting scissors 80 return to the first standby position, the solenoid 79 is turned off, and the downward pressing by the pressing body 91 is released.

When the sewing starts, the lower thread cutting device 5
At 0, the solenoid 66 changes from the Off state to the On state, and the rod 66a is pushed forward. As a result, the operating member 68 rotates counterclockwise in FIG. 8, and the extending pin 68a of the operating member 68 pushes the pin 56a. As a result, the upper knife 56 rotates clockwise with respect to the lower knife 57, and the lower thread cutting scissors 52 in a closed state are opened and the lower thread is released. After the lower thread cutting scissors 52 are opened, the solenoid 66 is turned off, the operating member 68 is rotated clockwise by the spring 69, and the operating member 68 returns to the initial state.

FIG. 9 is a schematic block diagram of the control circuit 110 of the buttonhole sewing machine 1. Control circuit 11
0 indicates a CPU (Central P) as shown in FIG.
processing Unit) 111, ROM (R
read-only memory) 112, RAM (R
and a Y-feed pulse motor driver 114 for driving each pulse motor, a baseline feed pulse motor driver 115, a needle feed pulse motor driver 116, and a needle thread cutting scissor actuator (here, solenoids 76 and 69). Upper thread trimmer scissor actuator driver 11 to be driven
7. A lower thread trimmer scissors actuator driver 118 that drives a lower thread trimmer scissor actuator (here, a solenoid 66), a sewing machine motor driver 119 that controls the driving of the sewing machine motor 5, and a presser lifting solenoid driver 126 that drives and controls the presser lifting solenoid 127. And a cylinder driver 120 for driving a cloth cutting knife lowering cylinder 19 for lowering the cloth cutting knife 16.

The sewing machine motor driver 119 includes, in addition to the sewing machine motor 5, a sewing machine motor encoder 1 that encodes a rotation amount of the sewing machine motor 5 as a rotation angle of the upper shaft 6.
21, an on-needle position sensor 122 for detecting that the sewing machine needle 9 is at an upper position, and a TG (tachogenerator) which is a detecting means in the present invention and detects the rotational speed of the upper shaft 6
The generator 123 and the like are connected. Further, the CPU 111
The operation panel 100 and the work clamp 15 described later
Presser switch 124 for instructing lowering, and start switch 12 for instructing start of driving of sewing machine motor 5
5 are connected.

The CPU 111 uses the 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,
Control means for controlling each drive unit via each driver based on detection signals from various connected sensors. The ROM 112 stores control data for buttonhole buttonhole sewing based on input processing from the operation panel 100 and various sewing data input via the operation panel 100 (all needle drop positions from the start of sewing to the end of sewing). And the like, and a control program including a sewing process for performing a sewing operation in accordance with the calculated control data is stored. In the ROM 112, a settable data value range, a unit value of data that can be increased or decreased by one operation of a minus key 103b and a plus key 103c described later, a standard data value, corresponding to each of the data items shown in FIG. Etc. are stored. Further, the ROM 112
In order to sew the buttonhole sewing of a predetermined shape pattern, all the data values (No. 1 to No. 2) in FIG.
A plurality of patterns set for 3) are stored. The RAM 113 serves as a work area for the CPU 111, and also serves as a storage unit of the present invention for storing various data of buttonhole stitches input via the operation panel 100.

FIG. 10 shows a buttonhole overlock sewing machine 1.
1 shows an operation panel (input means) 100 provided in the device. The operation panel 100 is used for setting and inputting various sewing parameters, for displaying and outputting set values, and for displaying and displaying an error in sewing control. For example, a sewing machine on which the buttonhole buttonhole sewing machine 1 is mounted is provided. It is provided on a table. The operation panel 100 includes a start operation unit 101, a number operation unit 102, a data value input operation unit 103, and a mode switching operation unit 104. Start operation unit 1
01 is provided with a preparation key 201a for the operator to input that sewing preparation is completed and resetting, and a display unit 201a including an LED (Light Emitting Diode) for displaying the state. .

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

The data value input operation unit 103 includes a data value display unit 103a, a minus key 103b, and a plus key 1
03c is provided. The data value display unit 103a
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 described later, a predetermined unit value and a settable range are determined for each data item.
Pressing 03b decreases the data value by the unit value, and pressing the plus key 103c increases the data value by the unit value.

The mode switching operation unit 104 has a pattern number key 1 for switching to a pattern number setting mode.
04a and data key 1 for switching to data input mode
04b. Pattern number key 104
Indicators 104c and 104d such as LEDs are provided on the a and the data key 104b, respectively, and by lighting these, it is possible to inform an operator of a pattern number setting mode or a data input mode. First, the operator needs the pattern number key 1
04a is operated to set a desired pattern number to the pattern No. in FIG. .., And then operate the data key 104b to select each data item. The data value input operation unit 103 sets and changes the data value. Since the data value is set in advance for each pattern by selecting the pattern number, there is no need to change it if the data value is sufficient.

Here, the types and contents of sewing data that can be input from the operation panel 100 and determine the shape and size of the buttonhole stitching will be described. FIG. 11 is a data table showing the data items that can be input from the operation panel. FIG. Show. In FIG. 12, a data item name and a data number are described in each part of the buttonhole overlock stitch u0.

The data items that can be input from the operation panel 100 for the buttonhole overlock stitch u0 are as shown in the data table of FIG. That is, the data numbers 1 to 16 are the cloth cutting length data (the length of the buttonhole groove u1) and the female groove right width data (the buttonhole groove u1 and the left end of the right sewing portion u2). Distance), knife groove left width data (the distance between the button hole groove u1 and the right end of the left sewing portion u2), overlock width data (left and right width length of the side sewing portion u2),
Bartacking length data (vertical length of bartacking section u3), clearance data that is clearance length data (distance between lower end of upper bartacking section u3 and upper end of buttonhole groove u1) and second clearance data (lower bartacking section) Distance between the upper end of the stop portion u3 and the lower end of the button hole groove u1), parallel portion pitch data (vertical distance between the two stitches of the side sewing portion u2), and bar tack portion pitch data (the bar tack portion u3)
In the vertical direction between the two stitches), bar-tacking width right correction data (the deviation length between the right end of the bar-tacking part u3 and the right end of the right-side sewing part u2), bar-tacking width left correction data (the bar-tacking part u3 Length of deviation between the left end and the left end of left sewing section u2), left parallel section tension data (thread tension when sewing left sewing section u2), right parallel section tension data (thread tension when sewing right sewing section u2) , 1st bar-tacking section tension data (thread tension when sewing upper bar-tacking section u3),
Each item is the second bar tacking portion tension data (thread tension at the time of sewing the lower bar tacking portion u3), the maximum speed limit data (the maximum number of rotations of the sewing machine), and the like.

The data numbers 17 to 23 in FIG.
Is a characteristic data item in the present invention. In the conventional sewing machine, the overlock sewing shown in FIG.
As shown in FIG. 13A, when the sewing is started from the point A of the left sewing portion, the sewing must be finished at the same point A as shown in FIG. However, in the present invention, the solenoid 76,
Since the operation of the upper thread cutting device 70 and the lower thread cutting device 50 after thread trimming is made independent of other mechanisms such as cloth feeding and presser foot lifting, the sewing end position can be set as in the related art. It is not necessary to match the sewing start position. Therefore, the sewing start position and the sewing end position can be set separately. That is, in the sewing machine 1, the data No. 19
“Sewing start position”, No. 20 "End position of sewing" can be set. For example, set point A as the "sewing start position"
The point B in FIG. 13C can be set as the “sewing end position”. These data are 0.1 mm in the range of “0.00 to 5.00” mm with the origin position in the Y ′ direction (the direction opposite to the cloth feeding direction) in which the stitch is formed being “0”. It can be set at intervals. Here, the sewing start position and the sewing end position are both inside the left-side sewing portion on the base line.

Further, conventionally, since the thread trimming and the raising operation of the presser foot are interlocked, the presser foot has to be raised every time one overlock sewing is completed. Further, since the cloth feed and the release of the thread were related, the cloth feed means (Y feed drive means) had to be mechanically set to the home position at the start of sewing. However, in the present invention, since there is no such relationship, a plurality of stitches can be continuously formed at a time (continuous sewing), and the sewing position with respect to the work clamp can be set freely. For example, if a very long presser foot that can cover the area between two adjacent buttonholes is used, after one buttonhole overlock sewing, the buttonhole can be removed at the next overlocking position without removing the presser foot. Overlock stitching can be performed.

That is, in the sewing machine 1, the data No. 1
No. 7 “Number of stitches”, No. No. 18 “Sewing interval”, No. 23 "sewing position" can be set. "Number of stitches" is "1-
It can be set in the range of "5". For example, as shown in FIG. 14, assuming that a cloth foot 15 ′ which is sufficiently long in the Y direction is used, two buttonhole overlock sewings B as shown in FIG.
In the case of forming 1, B2, "2" is set. Also,
When one buttonhole sewing B3 is formed as shown in FIG. 14B, “1” is set. "Sewing interval" is shown in FIG.
When a plurality of buttonhole sewings are formed as in (a), the distance W between the origins of adjacent stitches is set, and can be set at 1 mm intervals in the range of “0 to 100” mm. Data No. The "sewing position" 23 is based on the mechanical origin position of the Y-feed drive means 13, and is the origin position of the stitch to be formed first (the position which is the origin of the "sewing start position"), that is, FIG. (A) is "01", FIG.
In FIG. 4B, “02” is set. This value can be set at intervals of 1 mm within a range of “0 to 100” mm. With this setting, the position in the frame of the work clamp 15 ′ to be sewn is set.

Data No. Since the sewing position within the presser foot can be set freely according to 23 "sewing position", it is convenient when sewing near the step portion of the fabric. Conventionally, if a long cloth presser 15 'is used, the stitch forming position and the cloth feeding position are fixed, and therefore, as shown in FIG.
When the buttonhole sewing B4 is formed in the vicinity of the step S1, the presser foot 15 'floats. In this case, it is necessary to replace the presser foot 15' with a shorter one. However, if the sewing position in the frame of the cloth presser 15 'can be freely set as in the present invention, the sewing position is adjusted with respect to the cloth feed 15' so as to avoid the step S1 as shown in FIG. It can be set and there is no need to replace the work clamp 15 '.

In addition, in the upper thread cutting device 70 and the lower thread cutting device 50, since the independent actuators of the solenoid 76 and the solenoid 66 are used to release the upper thread and the lower thread, the upper thread and the lower thread at the start of sewing are used. The timing for releasing the lower thread can be freely set. Therefore, the data No. in FIG. No. 21 "Needle holding release timing", No. 21 22
In the "bottom thread holding release timing", the number of stitches is set within the range of "1 to 20" from the start of sewing. Further, the ROM
A table t1 shown in FIG. In this table t1, the number of rotations of the upper shaft
The number of stitches to be corrected for the release timing for each of the upper thread and the lower thread is set. For example, if the number of revolutions is "400", the number of corrected stitches is "0" for both the upper thread and the lower thread. No. 21 "Needle holding release timing", No. 21 The thread is released at the timing set in 22 "Bottle thread holding release timing". When the rotation speed is "300
If "0", the upper thread is for "3" stitches, the lower thread is for "2" stitches, and data No. 21, no. The yarn is released faster than the value set at 22. That is, the table t1 is for adjusting the thread to be released at an earlier timing when the sewing speed is high.

Of the pattern numbers shown in FIG.
“60” and “61” are “different pattern continuous stitching” patterns in which different patterns are continuously sewn. For example, when the pattern "60" is selected on the operation panel 100, the contents of each step and the sewing position are set in place of the data items, as shown in a table t2 of FIG. I will do it. A pattern number of one stitch shape is set for each process, and the process is sewn with sewing data according to the selected pattern number. The “sewing position” is the same as the data No. Like the “sewing position” of No. 23, it is the distance from the origin position of the cloth feed, and in other steps it is the distance from the previous step. In FIG. 17, for example, "1" is set in step 1 and "2" is set in step 2, and thereafter, this is repeated until step 5, and the sewing position is set to "30" in step 1 and to "70" in other cases. . With this setting, the pattern No. 1 and the pattern No. The overlock stitch based on No. 2 is alternately repeated, and the distance between the stitches is 70 mm.

FIGS. 18 to 21 show flowcharts of the respective processes performed under the control of the CPU 111 in the buttonhole overlock sewing machine 1 having the above configuration. FIG.
Shows the general flow of buttonhole buttonhole sewing.
The flow in FIG. 18 starts when, for example, the power of the sewing machine 1 is turned on. First, in step S1, a setting process of the operation panel 100 is performed by an operator. Step S
In 2, it is determined whether or not the preparation key 101a has been operated, and if it has been operated, the process proceeds to step S3, and if not, the process returns to step S1. In step S3, a process of calculating the needle drop position is performed based on the data set via the operation panel 100, and then, in step S4, it is determined whether the preparation key 101a has been pressed. Here, if the preparation key 101a is pressed,
Returning to step S1, the setting can be reset. Step S
If the preparation key 101a has not been pressed in step 4, the process proceeds to step S5, where the sewing material is set by the operator. Next, in step S6, it is determined whether the start switch 125 has been turned ON. If the start switch 125 is turned on by the operation of the operator, the process proceeds to step S7, where sewing processing including overlock sewing, button hole punching, thread cutting, and the like is performed. Step S
If it is determined in step 6 that the start switch 125 has not been turned ON, the process returns to step S4.

FIG. 19 shows a flow of the sewing process in step S7. First, in step J1, FIG.
1 data No. 1 As the first of 17 “number of stitches”,
Count as "M = 1". Next, in step J2, the data No. The cloth is fed in the Y direction by the Y feed pulse motor 20 to the "sewing position" set at 23. Further, in step J3, the data No. The cloth is fed in the Y direction to the "sewing start position" set in step 19. The process proceeds to step J4 where the sewing machine motor 5 and the like are driven to form the overlock stitch while dropping the sewing machine needle 9 to the needle drop position obtained in step S3, and the cloth cutting knife 16 is formed.
To form a button hole of a predetermined length (FIG. 11, data No. 1).
0 is driven as described above to perform the thread cutting process. Next, at step J5, the M value at step J1 is set to the data No. It is determined whether or not the number is “sew number” of No. 17. If it is the number of stitches, the process proceeds to step J8, in which the presser lifting solenoid 127 is driven, the work clamp 15 is raised, and this processing ends. On the other hand, if it is determined in step J5 that M has not reached the number of stitches, then in step J6, "M = M +
1 ". Next, at step J7, the data No. The cloth is fed by the "sewing interval" set in 18, and after the cloth is fed in the Y direction to the "sewing start position" in step J9, the process returns to step J4 to perform the next sewing.

FIG. 20 shows a flow of releasing (holding release) processing of the upper thread and the lower thread at the start of sewing. This processing is first started in step J10 by inputting an interrupt signal from the needle position sensor 122 indicating that the sewing machine needle is located at the top dead center. Next, step J11
In step 2, "1" is added to the stitch count. Next, in step J12, the current rotational speed is obtained from the TG generator 123. Next, in step J13, the "upper thread holding release timing" set in data No. 21 of FIG.
From the number of stitches, the number of stitches (needle number correction) obtained from the table t1 in FIG. 16 is subtracted from the number of rotations obtained in step J12, to obtain the number of stitches at the timing at which the upper thread should be released. In step J14, as in step J13, the rotation speed acquired in step J12 is used to calculate the rotation speed acquired in step J12 from the number of stitches at the "bobbin thread holding release timing" set in data No. 22 of FIG.
6 minus the number of stitches (stitch number correction) found in the table t1,
Find the number of stitches at the timing when the bobbin thread should be released.

Next, at step J15, it is determined whether or not the number of stitches currently sewn is equal to or greater than the number of stitches obtained at step J13.
The process then proceeds to 16 where the upper thread cutting device 70 (solenoid 7
6) is driven to release the holding of the upper thread, and the flow shifts to step J17. If it is determined in step J15 that the number of stitches obtained in step J13 has not been reached, step J17 is performed.
Move to At step J17, it is determined whether or not the number of stitches currently sewn is equal to or greater than the number of stitches obtained at step J14. The solenoid 66) is driven to release the holding of the lower thread, and this process ends. Step J
If it is determined at step 17 that the number of stitches has not reached the number of stitches determined at step J14, this process is terminated.

FIG. 21 shows the flow of the different pattern continuous sewing process set as in the table t2 of FIG. This process starts when the start switch 125 is operated. First, in step J20, the number of processes is set to “N”.
= 1 ”. Next, in step J21, the cloth is sent in the Y direction to the sewing position of the Nth step, here, the first step, and in step J22, the cloth is sent in the Y direction to the "sewing start position". Next, step J23
Then, the N-th, here the first, pattern is sewn. In step J24, 1 is added to N, and a new N
And the process proceeds to Step J25. In step J25, it is determined whether or not the “N” th process counted in step J24 is set in the table t2. If so, the process returns to step J21 and sewing is performed according to the pattern of the Nth process. Step J
If it is determined in step 25 that the “N” th step has not been set, this processing ends.

According to the buttonhole buttonhole sewing machine 1 described above, the upper thread is released by the upper thread cutting scissors 80 by the solenoid 76, and the lower thread is released by the lower thread cutting scissors 52 by the solenoid 66. . That is,
That is, the release of the holding of the upper thread and the lower thread does not interlock with another mechanism such as a cloth feed mechanism as in the related art, but uses an independent drive source. Therefore, there is no restriction imposed by the cloth feeder. Therefore, the sewing start position (data No. 19 in FIG. 11) and the sewing end position (data No.
20), and a stitch can be formed under the control of the CPU 111 so that the sewing start position and the sewing end position are different from each other. Therefore, unnecessary waste sewing as in the prior art is eliminated, the appearance is improved, the sewing quality is improved, and the cycle time can be shortened. In addition, the solenoids 76 and 66 for releasing the thread are thus provided.
Is independent of the cloth feed mechanism, it becomes possible to use a knife that forms a button hole while feeding the cloth before sewing. As described above, according to the sewing machine 1, it is possible to sufficiently cope with various stitch designs and sewing methods.

Since the upper thread and the lower thread are configured to be released by different actuators respectively, the upper thread holding release timing (data No. 21) for each of the upper thread and the lower thread via the operation panel 100. ), The lower thread holding release timing (data No. 22) can be set, so that the thread end cannot be set in the seam according to the sewing conditions, for example, the type of the fabric or thread, the length or width of the buttonhole buttonhole sewing. The thread can be released at an appropriate timing so as to hide it neatly, and the sewing finish is further improved. In addition, based on the table t1 shown in FIG. 16, the higher the number of revolutions at the start of sewing, the sooner the thread is held, and the more the sewing is finished.

The data N is input via the operation panel 100.
o. 23 By setting the "sewing position",
Since the stitch formation position for (15 ') can be set, the sewing position with respect to the presser foot can be changed depending on the size of the presser foot, the state of the cloth (the material to be sewn), and the like. Even when it is necessary to change the sewing position, an appropriate sewing state can be prepared only by changing the sewing position, and workability is improved.

In addition, continuous sewing is possible, and data No. By setting the value of “2” or more at 17, a plurality of buttonhole buttonhole stitches can be continuously formed without raising the presser foot using a large presser foot such as the presser foot 15 ′. Therefore, the cycle time is shortened and the productivity is improved. In particular, the table t
According to the continuous sewing of different kinds of patterns set in FIG. 2 (FIG. 17), the buttonhole sewing of different patterns can be continuously formed, so that it is possible to cope with various designs.

In the first embodiment, after the sewing operation, the operating lever 87 is operated to transmit the mechanical operation, thereby cutting the upper thread and the lower thread. Although the solenoid 79 is used for movement and the solenoids 76 and 66 are used as actuators for releasing the upper and lower threads, the present invention is not limited to this. That is, various operations in the upper thread cutting device and the lower thread cutting device, that is, all of thread cutting, movement after thread cutting, and release of thread holding may be performed by using a solenoid as a drive source. A configuration for performing the above operation may be adopted. Further, in the case of continuous sewing of different patterns, the sewing may be performed continuously including a sewing pattern different from the buttonhole sewing, for example, a sewing pattern such as an embroidery pattern.

<Second Embodiment> FIGS. 22 to 25 show
2 shows a second embodiment of the present invention. The main configuration of the sewing machine according to the second embodiment is the sewing machine 1 according to the first embodiment.
This is almost the same as the above, and only the upper thread cutting device and the lower thread cutting device are different. The actuator of the upper thread cutting device / lower thread cutting device in the present invention is not limited to the solenoid, and may be any device that can be electrically controlled. For example, the following upper thread cutting device 200 / lower thread cutting A motor like the device 230 may be used. 22 to 25, the same members as those in the above embodiment are denoted by the same reference numerals.

As shown in FIGS. 22 and 23, the upper thread cutting device 200 includes an upper thread cutting scissor 80 and a pulse motor 2.
An upper thread trimming scissors driving mechanism 202 for opening and closing the upper thread trimming scissors 80 and moving the upper thread trimming scissors 80 by using the drive source 01 as a drive source. Needle thread cutting scissor drive mechanism 20
2 is a pulse motor 201, a lever 77 and a cam mechanism 2
04, upper thread cutting base 205, and cam members 207, 21
0, the latch cam members 208 and 211, and the tension spring 20
9, 212. A base 203 is provided on the arm portion 4, and the upper thread cutting scissor driving mechanism 20 is provided on the base 203.
2 are installed. The drive shaft 201a of the pulse motor 201 projects rightward from the base 203, and is rotatable with respect to the base 203. Base 2
A rotating base 206 is provided at the rear end of the lower part of 03 so as to be freely rotatable. The upper thread trimming base 2 provided substantially parallel to the base 203 is provided on the rotating base 206.
05 is connected to the rotating base 206 so as to be slidable back and forth. A cam member 207 is fixed to the left side of the base 203. Cam member 2
A cam surface 207a is formed at the front end of the reference numeral 07.

Further, one end of a hook-shaped latch cam member 208 is rotatably connected to the left surface of the base 203. The latch cam member 208 includes a tension spring 20.
The other end of the tension spring 109 is connected to the base 203. The tension spring 209 urges the latch cam member 208 in a counterclockwise direction when viewed from the right (in FIG. 23). A cam surface 208a is formed at the lower end of the latch cam member 208. On the other hand, a cam member 210 having a cam surface 110a is fixed to the right surface of the upper thread cutting base 205. And needle thread cutting base 2
05, the cam surface 110a becomes the cam surface 107a.
It comes into contact with and separates from.

On the left side of the upper thread cutting base 205, a latch cam member 211 is provided with a cam surface 2 formed on the upper end thereof.
11a is fixed so as to protrude upward from the upper thread cutting base 205. When the latch cam member 211 moves leftward in a state where the cam surface 211a and the cam surface 208a of the latch cam member 208 are in contact with each other, the latch cam 208 And rotate upwards. Finally, the contact between the cam surface 208a and the cam surface 211a is released,
A latch cam member 208 is provided on the right side of the latch cam member 211.
Comes into contact with the left side. Incidentally, a tension spring 212 for urging the upper thread cutting base 205 rightward is connected to an intermediate portion of the upper thread cutting base 205. The tensioning spring 212 urges the upper thread trimming base 205 in a direction to rotate rightward about the rotary base 206. However, when the right surface of the latch cam member 211 and the left surface of the latch cam member 208 come into contact with each other, the rotation of the upper thread cutting base 205 to the right is suppressed.

The lever 77, which is the same as in the first embodiment, is rotatable at its intermediate portion.
It is attached to the right side of the upper thread cutting base 205. The lever 77 is urged rearward by a tension spring 78. At the front end of the upper thread cutting base 205, an upper thread cutting scissor 80 is provided. Further, a closing plate 25 is provided at a front end of the upper thread cutting base 205.

The driving shaft 201 of the pulse motor 201
The cam mechanism 204 is connected to a. Cam mechanism 2
Reference numeral 04 includes a drive cam member 213 attached to the drive shaft 201a, a front and rear cam arm 214 and a scissor cam arm 215 attached to the drive cam member 213, and the like. The drive cam member 213 is a substantially disk-shaped member disposed on the right side of the base 203, and has a central portion fixed to the drive shaft 201a and rotates with the drive shaft 201a. The driving cam member 213 has a first cam hole 213b and a second cam hole 213.
c is formed. The drive cam member 213 is formed with a detecting portion 213a so as to protrude outward, and the sensor 218 detects an edge 213d of the detecting portion 213a. The sensor 218 detects that the rotation angle of the driving cam member 213 is in an initial state by detecting the edge 213d.

The front and rear cam arms 214 are rotatably connected to the base 203 at an intermediate portion thereof. A cam follower 214a slidably engaged with the second cam hole 213c is provided at an upper portion of the front and rear cam arms 214, and a pin 216 is provided at a lower portion. The pin 216 is slidably engaged with an elongated through hole 205 a formed in the upper thread cutting base 205. The scissor cam arm 215 is rotatably connected to the base 203 at an intermediate portion thereof. A cam follower 215a slidably engaged with the first cam hole 213b is provided at an upper portion of the scissor cam arm 215, and a pin 217 is provided at a lower portion of the scissor cam arm 215 so as to be close to the other end of the lever 77. Is provided.

Although not shown in FIG. 22, to be precise, each of the first cam hole 213b and the second cam hole 213c has a cam groove formed by an arc which keeps a fixed distance from the center of the driving cam member 213. , And a plurality of cam grooves each having a circular arc whose distance gradually changes.
Accordingly, when the driving cam member 213 is driven by the pulse motor 201 and rotates in a predetermined direction, the cam followers 215a and 214a fitted in the first cam hole 213b and the second cam hole 213c are moved to the center of the driving cam member 213. Keep a certain distance from, or move away from or approach. When moving away or approaching, the scissors cam arm 215 and the front and rear cam arms 214 rotate in predetermined directions via the cam followers 215a and 214a. The rotation of the front and rear cam arms 214 causes the pins 21 to move.
6, the upper thread cutting base 205 moves back and forth. Also, by the rotation of the scissor cam arm 215,
The lever 77 rotates via the pin 217.

Next, the lower thread cutting device 230 will be described. As shown in FIGS. 24 and 25, the lower thread cutting device 23
Reference numeral 0 includes a lower thread cutting scissors 52, a lower thread cutting scissors closing means 240, and a lower thread cutting scissors opening means 245 having substantially the same configuration as that of the lower thread cutting device 50 according to the first embodiment, and further includes a drive. Means 233.

The driving means 233 includes a pulse motor 231
, The second drive cam member 234, and the first L-shaped link member 2
35 and a second L-shaped link member 236. The pulse motor 231 includes a base 23 fixed inside the bed 2.
2 (not shown in FIG. 24).
The drive shaft 231 a of the pulse motor 231 protrudes upward from the base 232 and is rotatable with respect to the base 232. The second drive cam member 234 includes a base 232.
Is arranged above. The second drive cam member 234 is a substantially disc-shaped member, and its center (center of rotation) is
1a, and rotates together with the drive shaft 231a. A detecting portion 234a is formed on the outer peripheral portion of the second drive cam member 234, and the sensor 237 detects an edge 234d of the detecting portion 134a. The sensor 237 is an edge 234
By detecting d, it is detected that the rotation angle of the second drive cam member 234 is in the initial state.

The second drive cam member 234 has a first cam hole 234b and a second cam hole 234c. The first L-shaped link member 235 is attached to the bed so as to be rotatable around a vertical axis at the bent portion. One end of the first L-shaped link member 235 has a cam follower 235a slidably engaged with the first cam hole 234b.
Is provided. The other end is rotatably connected to the rear end of the link member 241 of the lower thread cutting scissor closing means 240. The front end of the link member 241 is rotatably connected to one end of the lower thread cutting link 242. The second L-shaped link member 236 is attached to the bed portion so as to be rotatable around a vertical axis at the bent portion. A cam follower 236a slidably engaged with the second cam hole 234c is provided at one end of the second L-shaped link member 236. The other end is rotatably connected to the rear end of the link member 67 of the lower thread cutting scissors releasing means 245.

The first cam hole 23 of the second drive cam member 234
As shown in FIG. 25, each of the 4b and the second cam holes 234c is formed with a plurality of cam grooves that keep a certain distance from the center of the driving cam member 234 and a plurality of cam grooves that change the distance. It is something. Therefore, the second driving cam member 2
The cam followers 235a and 236 fitted in the first cam hole 234b and the second cam hole 234c are driven by the pulse motor 231 and rotated in a predetermined direction.
“a” keeps a certain distance from the center of the second drive cam member 243, or moves away from or approaches the center. When moving away or approaching, the cam followers 235a, 236
The first L-shaped link member 235 and the second L-shaped link member 236 rotate in a predetermined direction via a. The rotation of the first L-shaped link member 235 closes the lower thread cutting scissors 52, and the rotation of the second L-shaped link member 236 opens the lower thread cutting scissors 52.

Next, the operation of the upper thread cutting device 200 and the lower thread cutting device 230 will be described. During sewing of the sewing machine, the upper thread cutting device 200 is in the following initial state. 1. Edge 213d is detected by sensor 218,
The pulse motor 201 and the drive cam member 213 are at the initial rotational position. The cam follower 214a and the cam follower 215a are respectively located substantially at the centers of the second cam hole 213c and the first cam hole 213b. 2. The lever 77 is located rearward by the urging force of the tension spring 78. The upper thread cutting scissors 80 are open at a predetermined standby position. 3. Right side of latch cam member 211 and latch cam member 20
8 is in contact with the left surface. Thereby, the rotation of the upper thread cutting base 205 to the right by the tension spring 212 is suppressed. 4. The cam surface 110a of the cam member 210 is
The cam surface 107a.

The lower thread cutting device 230 is in the following initial state. 1. The edge 234d is detected by the sensor 237, and the pulse motor 231 and the second drive cam member 234 are at the initial rotational position. 2. The cam follower 235a and the cam follower 236a
Each of the first and second cam holes 234b and 234c is located substantially at the center (point S and point R in FIG. 24). 3. The extension 56b of the upper knife 56 is provided at the edge 51 of the needle plate base 51.
The lower thread trimming scissors 52 are not in contact with b and are open at a predetermined standby position.

After the sewing is completed, the pulse motor 201
Rotates forward, the driving cam member 213 rotates counterclockwise (in the direction of arrow k in FIG. 23), and the cam follower 215a slides along the first cam hole 213b. At this time, the cam follower 215a and the driving cam member The distance from the center of 213 is constant, and the scissor cam arm 215 does not rotate. On the other hand, the rotation of the driving cam member 213 causes the cam follower 214a to rotate.
Slides along the second cam hole 213c. At this time, according to the shape of the second cam hole 213c, the driving cam member 2
The distance between the center of the thirteen and the cam follower 214a increases. Accordingly, the cam follower 214a moves rearward, and the front and rear cam arms 214 rotate clockwise (arrow h in FIG. 23). As a result, the pin 216 rotates forward, and the upper thread cutting base 205 moves forward. When the latch cam member 211 moves forward together with the upper thread cutting base 205, the contact between the right surface of the latch cam member 211 and the left surface of the latch cam member 208 is released, and the distance between the cam surface 207a and the cam surface 210a also increases. Latch cam member 2
When the contact between the right surface of the cam 11 and the left surface of the latch cam member 208 is released, the front end of the upper thread cutting base 205 rotates rightward about the rotary base 206 by the urging force of the tension spring 212. By rotating the upper thread cutting base 205 to the right, the cam contact portion 86a contacts the closing plate 25. Then, as in the first embodiment, the upper thread cutting scissors 80 are closed. By closing the upper thread cutting scissors 80, the upper thread is cut and the cut upper thread is held.

After the cutting, the driving cam member 213 further rotates counterclockwise, but the distance between the cam follower 214a and the center of the driving cam member 213 is constant. Therefore, the front and rear cam arms 214 do not rotate, and the upper thread trimming base 2
05 also stops moving forward. Thereafter, the pulse motor 201 rotates in the reverse direction, and the drive shaft 201a of the pulse motor 201 is rotated.
Stop when returns to the initial state. This reverse rotation causes the drive cam member 213 to rotate clockwise (in the direction of arrow j in FIG. 23), and the scissor cam arm 21 via the cam follower 215a.
5 does not rotate, but the front and rear cam arms 214 rotate counterclockwise through the cam followers 214a, and the upper thread cutting base 20 rotates.
5 moves backward.

The cam member 21 together with the upper thread trimming base 205
When 0 moves backward, the cam surfaces 110a and 107
a contacts. Further, when the cam member 210 moves rearward together with the upper thread cutting base 205, the front end of the upper thread cutting base 205 moves leftward against the urging force of the tension spring 212 due to contact with the cam members 210 and 207. To rotate.

After the sewing is completed, when the pulse motor 231 of the bobbin thread cutting device 230 rotates forward, the second drive cam member 23
4 rotates clockwise (n direction in FIG. 24). As a result, the cam follower 236a slides along the second cam hole 234c, but since the distance between the cam follower 236a and the center of the second drive cam member 234 is constant, the second L-shaped link 136 does not rotate. On the other hand, the cam follower 235a
Slides along the first cam hole 234b, and the first cam hole 23
According to the shape of 4b, the distance between the center of the second drive cam member 234 and the cam follower 235a becomes smaller. Accordingly, the cam follower 235a moves rightward, and the first L-shaped link member 235 rotates counterclockwise as viewed from the bottom (the state of FIG. 24).

With the rotation of the first L-shaped link member 235,
The lower thread reeling arm 63 rotates counterclockwise, and the lower knife 57 rotates clockwise. While the bobbin thread reeling arm 63 rotates, the bobbin thread is threaded toward the lower knife 57 side. On the other hand, the lower thread cutting scissors 52 are closed by the rotation of the lower knife 57, and the manually threaded lower thread is cut and held. After cutting the bobbin thread, the second drive cam member 234 further rotates clockwise. At this time, the distance between the cam follower 235a and the rotation center of the second drive cam member 234 is constant, and the first L-shaped link member 2 is rotated.
35 does not rotate. Therefore, the lower thread cutting scissors 52 do not rotate, and are located at the cutting position in a closed state.

Thereafter, the pulse motor 231 rotates reversely and stops when the drive shaft 231a of the pulse motor 231 returns to the initial state. When the pulse motor 231 rotates in the reverse direction, the second driving cam member 234 rotates counterclockwise, so that the second L-shaped link member 236 does not rotate via the cam follower 236a, but the first L-shaped link via the cam follower 235a. The member 235 rotates clockwise. With the rotation of the first L-shaped link member 235, the lower thread cutting scissors 5
2 returns to the initial position in the closed state.

Next, when the start switch is operated by the operator, the sewing machine starts sewing in the next cycle. At the start of sewing, the pulse motor 201 rotates in the reverse direction, and the drive cam member 213 rotates clockwise (the j direction in FIG. 23). During this rotation, the distance between the cam follower 214a and the rotation center of the drive cam member 213 is constant, so the front and rear cam arms 214 do not rotate, and the upper thread cutting base 205 does not move. On the other hand, the cam follower 215a and the driving cam member 21
The distance from the rotation center 3 becomes small. Therefore, the cam follower 215a moves rearward. As a result, the scissor cam arm 215 rotates clockwise in FIG. 23, and the pin 217 moves forward. therefore,
The pin 217 pushes the other end of the lever 77 forward, and the lever 77 rotates counterclockwise (in the direction of the arrow in FIG. 23) against the tension spring 78. By the rotation of the lever 77, the opening cam portion 77a pushes the cam contact portion 86a, and the upper thread cutting scissors 80 release the upper thread.

After the upper thread is released, the driving cam member 213 further rotates clockwise. However, since the distance between the cam follower 215a and the rotation center of the driving cam member 213 is constant, the scissor cam arm 215 does not rotate, and the scissor cam 215 does not rotate. The arm 215 stops while pushing the lever 77 forward. at the same time,
The cam follower 214a also slides along the second cam hole 213c, but at this time, the distance between the rotation center of the driving cam member 213 and the cam follower 214a becomes small. As a result, the front and rear cam arms 214 rotate counterclockwise,
6 rotates rearward. Therefore, needle thread cutting base 2
05 and the cam member 210 moves rearward,
It comes into contact with the cam member 207. Thereby, the thread cutting base 2
05 rotates to the left against the urging force of the tension spring 212.

When the upper thread cutting base 205 rotates to the left,
The cam surface 211a of the latch cam member 211 contacts the cam surface 208a of the latch cam member 208. Further, when the upper thread cutting base 205 rotates to the left, the cam surface 211a pushes the cam surface 208a, and the latch cam member 208 rotates upward about the rear end. Eventually, the latch cam member 211 moves to the left of the latch cam member 208, and the contact between the cam surface 211a and the cam surface 108a is released. Thereafter, the latch cam member 208 rotates downward around its rear end by the urging force of the tension spring 209.
When the upper thread cutting base 205 rotates to the left, the left surface of the latch cam member 208 and the right surface of the latch cam member 211 abut. In this state, even if the reverse rotation of the motor 201 is stopped, the rotation of the upper thread cutting base 205 to the right is suppressed. Here, the left and right positions of the upper thread cutting base 205 are the same as the initial state. As described above, upper thread cutting scissors 8
0 is an open state and returns to a standby position, and becomes an initial state.

Next, when the pulse motor 201 rotates forward, the driving cam member 213 rotates counterclockwise. At this time, the scissor cam arm 21 is connected via the cam follower 215a.
5 does not rotate. Therefore, the scissor cam arm 215 stops while pushing the lever 77 forward. On the other hand, the front and rear cam arms 214 rotate clockwise through the cam followers 214a, and the pins 216 rotate forward. Therefore, the cam member 210 moves forward together with the upper thread cutting base 205, and finally, the front and rear positions of the upper thread cutting base 205 become the same position as the initial state.

Further, while the driving cam member 213 rotates counterclockwise, the cam follower 214a and the driving cam member 21 are rotated.
3 has a constant distance from the rotation center of the front and rear cam arms 2.
14 does not rotate. Therefore, the upper thread trimming base 205 does not move in the initial state, and the upper thread trimming scissors 80 do not move from the standby position. On the other hand, the scissor cam arm 215 rotates counterclockwise via the cam follower 215a,
17 rotates rearward. Thereby, the lever 7
7 rotates clockwise by the urging force of the tension spring 78, and the opening cam portion 77a separates from the cam contact portion 86a.

Next, when the control device rotates the pulse motor 231 in the reverse direction, the second drive cam member 234 rotates counterclockwise (direction m in FIG. 24). During this rotation, since the distance between the cam follower 235a and the rotation center of the second drive cam member 234 is constant, the first L-shaped link member 235
Does not rotate, and the lower thread cutting scissors 52 do not move. on the other hand,
The rotation center of the second drive cam member 234 and the cam follower 23
6a, whereby the second L-shaped link member 236 rotates clockwise when viewed from the bottom. With the rotation of the second L-shaped link member 236, the operating member 68 rotates counterclockwise when viewed from the bottom. Thereby, the operating member 6
8. The extension pin 68a at the tip pushes the pin 56a. As a result, the upper knife 56 rotates, and the lower thread cutting scissors 52 in the closed state open and release the lower thread. Further, when the second drive cam member 234 rotates counterclockwise, the distance between the cam follower 236a and the rotation center of the second drive cam member 234 is constant at this time.
Does not rotate. Therefore, the lower thread cutting scissors 52 are kept open.

Next, when the pulse motor 231 rotates forward, the second drive cam member 234 rotates clockwise. By this rotation, the first L-shaped link member 235 does not rotate via the cam follower 235a, and the lower thread cutting scissors 52 do not move. On the other hand, the second L-shaped link member 236 rotates counterclockwise through the cam follower 236a when viewed from the bottom. With the rotation of the second L-shaped link member 236, the operating member 68 rotates clockwise as viewed from the bottom, and the contact between the extension pin 68a of the operating member 68 and the pin 56a is released. As described above, the lower thread cutting device 230 returns to the initial state.

According to the above-described second embodiment, the upper thread cutting device 200 is provided with the pulse motor 201, and the lower thread cutting device 230 is provided with the pulse motor 231. The system was configured to hold the yarn and release the yarn, and these operations were driven independently of other mechanisms such as cloth feeding. Therefore, the same operation and effect as those of the first embodiment can be obtained.

[0099]

According to the present invention, the buttonhole sewing data and the sewing position are inputted through the input means, and under the control of the control means, the buttonhole sewing is performed at an arbitrary sewing position. Can be formed. In this manner, the sewing position with respect to the presser foot can be changed.
An appropriate sewing state can be adjusted according to the actual situation. For example, this is useful when there is a step or a cut in the fabric near the buttonhole stitch forming and it is desired to press the cloth with a cloth presser while avoiding them. As described above, according to the present invention, it is possible to sufficiently cope with various sewing methods.

[Brief description of the drawings]

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

FIG. 2 is a perspective view mainly showing a cloth feeding mechanism and a needle elevating mechanism of the buttonhole overlock sewing machine shown in FIG. 1;

FIG. 3 is a perspective view mainly showing a needle raising / lowering mechanism and a needle swing mechanism of the buttonhole overlock sewing machine of FIG. 1;

FIG. 4 is a plan view showing a needle thread cutting device.

FIG. 5 is an exploded perspective view of an upper thread cutting device and a lower thread cutting device.

FIG. 6 is a side view showing the upper thread cutting device.

FIG. 7 is a schematic diagram for explaining operations of an upper thread cutting device and a lower thread cutting device.

FIG. 8 is a bottom view showing the lower thread cutting device.

FIG. 9 is a block diagram showing a control circuit of the buttonhole sewing machine shown in FIG. 1;

FIG. 10 is a front view of an operation panel.

FIG. 11 is a data table showing parameters that can be input from the operation panel.

FIG. 12 is a diagram for explaining the correspondence between each data item in FIG. 11 and buttonhole buttonhole sewing.

FIG. 13 is a diagram for explaining that a sewing start position and a sewing end position are set to different positions.

14A and 14B are diagrams showing a case where a large-sized presser foot is used, wherein FIG. 14A shows a state in which two sewing machines are continuously sewn, and FIG. .

FIG. 15 is a perspective view for explaining the advantage of sewing at an arbitrary set position with respect to the work clamp.

FIG. 16 is a diagram showing a table for correcting the timing for releasing the holding of the upper thread and the lower thread according to the number of rotations.

FIG. 17 is a diagram showing a data table for continuous sewing of different kinds of patterns.

FIG. 18 is a diagram showing a general flow of buttonhole buttonhole sewing.

FIG. 19 is a flowchart of a sewing process in FIG. 18;

FIG. 20 is a flowchart showing a holding release process of the upper thread and the lower thread at the start of sewing.

FIG. 21 is a flowchart showing a different pattern continuous sewing process.

FIG. 22 is a plan view showing a needle thread cutting device in the buttonhole overlock sewing machine according to the second embodiment.

FIG. 23 is an exploded perspective view of the upper thread cutting device of FIG. 22.

FIG. 24 is a bottom view showing the bobbin thread cutting device in the buttonhole overlock sewing machine according to the second embodiment.

FIG. 25 is an exploded perspective view showing the lower thread cutting device of FIG. 24;

[Explanation of symbols]

 Reference Signs List 1 buttonhole overlock sewing machine 5 sewing machine motor 6 upper shaft (main shaft) 9 sewing machine needle 12 shuttle 13 Y feed driving means 15, 15 'cloth presser 50, 230 bobbin thread cutting device (bobbin thread cutting means) 52 bobbin thread cutting scissors 66 Solenoid (actuator) 70, 200 Upper thread cutting device (upper thread cutting means) 76 Solenoid (actuator) 80 Upper thread cutting scissors 100 Operation panel 110 Control circuit 111 CPU (control means) 112 ROM 113 RAM (storage means) 122 needle Position sensor 123 TG generator (detection means)

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3B150 AA24 BA06 CC01 CE04 GF02 GF03 JA03 JA07 JA11 LA05 LA06 LA13 LA26 LA28 LA38 LA73 LB02 MA02 NA05 NA25 NA27 NA37 NA64 NB09 NC03 NC06 NC11 QA06 QA07 QA08

Claims (1)

[Claims] 1. A sewing machine needle through which an upper thread is passed and which moves up and down with respect to an object to be sewn by rotation of a main shaft; Presser means, moving means for relatively moving the sewing machine needle and the cloth presser means so as to form an overlock seam around the buttonhole, buttonhole overlock sewing data, and the origin position of the buttonhole overlock stitch. Input means for inputting the sewing position of the button, storage means for storing the buttonhole keyhole sewing data and the sewing position input from the input means, and buttonhole keyhole sewing data and the sewing position stored in the storage means. When forming the buttonhole sewing, the moving means relatively moves the sewing machine needle and the cloth presser means, and a control means for performing buttonhole sewing which sets the origin position to the read sewing position is provided. Button sewing machine according to claim.