JPH11333164A - Buttonhole sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a beautiful seam which does not expose a cloth cut edge outside by sewing the periphery of a button hole at least two rounds by a sewing means and controlling a cloth cutter to be actuated to cut the button hole part at the first round of sewing and not to actuate the cloth cutting knife in the second round of sewing and later. SOLUTION: This buttonhole sewing machine 1 is equipped with a needle 9 to make lifting u[/down motion and right/left swing motion, cloth presser 15 to press cloth, a cloth holding plate 14 to move forward/backward in the cloth feeding direction, and a cloth cutting knife 16 to cut cloth to form a buttonhole. On buttonholing, sewing the periphery of the buttonhole is repeated at least twice under control by a controller to which an operation panel is connected as a seting inputting means and a selecting means. The cloth cutting knife 16 is actuated to cut the buttonhole part at the first round and the cut end of cloth generated thereby is rolled into the inside of the second round of buttonholing to prevent the cut end of cloth from being exposed outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole sewing machine for sewing around a buttonhole portion of an object to be sewn.

[0002]

2. Description of the Related Art A buttonhole sewing machine for sewing around a buttonhole portion of an object to be sewn has been developed before. The buttonhole sewing machine sets the cloth to Y
Cloth feeding means for moving the sewing machine needle in the X direction, cloth cutting means for cutting a cloth by lowering a cloth cutting knife into a button hole of the cloth, and the like. Overlock sewing is performed around the button hole by the cooperation of the means and the needle swing means, and the cloth cutting means operates the cloth cutting knife during sewing to cut the button hole of the cloth to form the button hole overlock. I do.

As shown in FIG. 26, a conventional buttonhole sewing machine generally includes a left parallel portion (parallel sewing portion) A, a first bar-tacking portion (bar-tacking portion) B, and a right parallel portion (bar-tacking portion). Parallel sewing part) C, second bar-tacking part (bar-tacking part) D
And overlock sewing so as to go around the button hole E. By operating the cloth cutting means near the end of the overlock sewing (for example, immediately before the end of the sewing of the right parallel portion C),
A button hole was opened by dropping a cloth cutting knife into the button hole portion F.

A sewing pattern such as "double sewing" is known as one of sewing patterns performed by a conventional buttonhole sewing machine. In the conventional "double stitching" pattern, the left parallel portion A, the first bar-tacking portion B, the right bar-tacking portion C, and the second bar-tacking portion D are formed by simply making two turns around the button hole portion. It was a heavy repetition.

[0005]

However, in the above-mentioned conventional buttonhole overlock sewing machine, since the buttonhole is formed just before the completion of the overlock sewing, a piece E () of the cloth formed by the cloth cutting knife is used. However, there is a problem that the cut end is exposed outside the overlock stitch without being entangled inside the overlock stitch. Sewing in which a piece of cloth was exposed was not very beautiful.

For this reason, it is known that a buttonhole is formed with a cloth cutting knife before forming a buttonhole stitch, and then a buttonhole stitch is formed around the buttonhole. Since overlock stitches are formed on the cloth which is easily fluttered and cannot be reliably pressed, stitches are generated or stitches are poorly tightened, so that there is a disadvantage that a clean stitch cannot be obtained.

On the other hand, in a general buttonhole buttonhole, the seam density is higher in the bar-tacking portion than in the parallel portion. However, in the conventional sewing pattern of "double stitching", not only the parallel portion is sewn twice but also the bar-tacking portion is sewn double, so that the density of the stitches at the bar-tacking portion becomes excessive. For example, there is a problem that the bar-tacking portion is raised more than necessary, resulting in a poor-looking finish and a reduction in commercial value. Further, when the needle is moved up and down due to the needle dropping into a place where the density is excessive, the thread is squeezed and causes a thread breakage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a buttonhole overlock stitch in which a clean stitch is obtained without leaving a piece of cloth formed by a cloth cutting knife exposed to the outside as it is. An object of the present invention is to provide a sewing machine and a buttonhole sewing machine control device which eliminates unnecessary stitches during double stitching, realizes double stitching with beautiful sewing finishes and a wide variety of sewing patterns. I have.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to claim 1 comprises sewing means for sewing around a button hole of a sewing object, and a button of the sewing object. In a buttonhole overlock sewing machine provided with a cloth cutting knife that cuts a hole, sewing around the button hole is performed at least two times by the sewing means, and the cloth cutting knife is operated during the first sewing. Cut the button hole,
The sewing machine is provided with a control unit that does not operate the cloth cutting knife at the time of sewing in the second and subsequent rounds.

According to the first aspect of the present invention, since the buttonhole portion is already cut at the time of the second round of sewing, the piece of the cloth formed by the cloth cutting knife is used for the second cut.
It is caught inside the overlock stitch, and the piece of cloth is not exposed to the outside as it is. That is, beautiful sewing is achieved in which the cut ends of the cloth are not exposed as it is, and since the first round overlock sewing is performed before the cloth is cut by the cloth cutting knife, the seam is finely finished.

According to a second aspect of the present invention, an object to be sewn is XY
The needle drop position is moved in the X-Y direction on the workpiece by the cloth feeding mechanism for feeding the workpiece in the direction, or the cloth feeding mechanism for feeding the workpiece in the Y direction and the needle swinging mechanism for swinging the sewing machine needle in the X direction. A button feeder that sews around the button hole portion of the sewing object in a buttonhole sewing machine, and a Y feed drive unit that moves the cloth feed mechanism in the Y direction by electric driving;
The X feed drive means for moving the cloth feed mechanism or the needle swing mechanism in the X direction by electric driving, and the Y feed drive means and the X feed drive means are controlled to perform sewing around the button hole two times. In addition, a cross-stitching function that shifts the needle drop position between the first and second rounds of sewing so that the first and second rounds of the sewing path cross each other, and a button hole area Is performed two times, and the needle drop position is substantially the same between the first and second rounds, so that the first and second rounds are substantially parallel to each other. It has a parallel sewing function, and has a configuration provided with a selection means for selecting one of the cross sewing function and the parallel sewing function.

According to the second aspect of the present invention, a sewing pattern of the conventional double sewing by the parallel sewing function and a sewing pattern in which the stitches of the cross sewing function overlap in a cross shape can be selected by the selection means. , The variation of sewing patterns becomes rich.

The sewing patterns to which the inventions according to the first and second aspects can be applied include sewing patterns (for example, Y) including a parallel portion parallel to the button hole and a bar-tacking portion for bar-tacking both ends of the button hole. In addition to sewing patterns used for button holes in shirts, etc., sewing patterns in which the seams at both ends of the button holes are formed radially around the ends of the button holes (for example, sewing patterns used for button holes in jeans) Etc. are also included.

According to a third aspect of the present invention, a parallel sewing portion parallel to a linear button hole portion provided on a sewing object and a bar-tacking sewing portion at both ends of the button hole portion are provided. In a buttonhole overlock sewing machine provided with sewing means for sewing around the periphery, sewing around the buttonhole portion is performed at least two times by the sewing means, and sewing of the bartacking sewing portion is performed at the time of the first round sewing. And a control means having a first-turn bar-tacking and sewing function for sewing the bar-tacking portion at the time of the second-turn sewing.

In general, the sewing pattern of the buttonhole buttonhole has a low seam density at a parallel sewing portion parallel to the buttonhole portion, and has a high seam density at bar-tacking portions at both ends of the buttonhole portion. Therefore, according to the fifth aspect of the present invention, double stitching is performed only in the parallel stitching portion having a low stitch density, and double stitching is not performed in the bartacking portion having a high stitch density. Unnecessary swelling of the bar-tacking portion can be eliminated, and beautifully sewn sewing can be realized, and thread breakage can be prevented because excessive frictional resistance is not given to the thread.

According to a fourth aspect of the present invention, there is provided the buttonhole overlock sewing machine according to the third aspect, wherein the first-turn bar-tacking sew-on function and sewing of the bar-tacking portion for the first and second turns are performed. A configuration is provided in which a selection means capable of selecting one of the sewing functions is provided.

According to the fourth aspect of the present invention, the conventional sewing pattern in which the bar-tacking portion is also double-stitched and the sewing pattern by the first-turn bar-tacking / blinking sewing function can be selected by the selection means. Wide variety of sewing patterns.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a buttonhole sewing machine 1 according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an overview of the buttonhole sewing machine 1.
FIG. 3 is a perspective view mainly showing a cloth feeding and needle raising / lowering mechanism, and FIG. 3 is a perspective view mainly showing a needle raising / lowering mechanism and a needle swing mechanism of the buttonhole holing machine 1.

The buttonhole sewing machine 1 includes a sewing machine needle 9 for raising and lowering and swinging the needle to the left and right, a cloth holder 15 for holding a cloth (to be sewn), a cloth held on the lower side, and a cloth feeding direction. Cloth holding plate 14 that moves back and forth, cloth holder 15
Upper thread cutting scissors 80 for cutting the upper thread on the upper side, cloth cutting knife 16 for cutting the cloth to form a buttonhole, operation panel 110 as setting input means for inputting setting data and selecting means (FIG. 10) , And buttonhole sewing machine 1
Of the present embodiment (FIG. 11) for controlling

The cloth holder 15 and the cloth holding plate 14 are
It also functions as a cloth feed, holds the cloth during sewing, and moves the cloth back and forth to feed the cloth back and forth. As shown in FIG. 2, the cloth holder 15 is connected to the cloth feed member 23 via the connection arm 24, while the cloth holding plate 14 is directly connected to the cloth feed member 23. The cloth feed member 23 is fixed to a feed shaft 22 having a rack 22a, and moves back and forth by driving a Y feed pulse motor 20 as a Y feed drive means composed of a pulse motor or the like, thereby moving the cloth holder 15 and the cloth holding plate. 14 is moved back and forth.

The lifting mechanism for raising and lowering the sewing needle 9 is shown in FIG.
As shown in FIG. 3, the upper shaft 6, a sewing machine motor 5 such as a pulse motor, a crank cam 7, etc., and the rotation drive of the sewing machine motor 5 is converted into a vertical movement by the crank cam 7 and transmitted to the needle bar 8. Then, 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 with a shuttle 12 connected to the lower shaft 11.

FIG. 4 is a front view of the needle swinging mechanism of the buttonhole holing machine 1 as viewed from the surface of the sewing machine, and FIG. 5 is a schematic diagram for explaining the operation of the needle swinging mechanism. FIG. 6 shows an example of the operation of the needle swing mechanism.
FIG. 3B is a diagram illustrating a state where the cam top of the needle swing cam 54 is on the base line side, and FIG.

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 leftward with a certain base line as an origin, a swing width changing mechanism for changing the needle swing width, and It is composed of a baseline changing mechanism that changes in the left-right direction.

As shown in FIGS. 3 to 6, the main needle swing mechanism includes a needle bar swing table 18, a needle swing arm 49, a connection shaft 48, a connection lever 47, a needle swing cam lever 46, a needle swing cam (a triangular cam). ) 54, a drive shaft 53, gears 51 and 52, and the like. By transmitting the rotational motion of the upper shaft 6 of the sewing machine to the swinging cam (triangular cam) 54, the swinging cam lever 46 is swung with a predetermined swing width. The needle bar swing table 18 is moved by this swing.
Is rotated about the fulcrum 18a to swing the sewing machine needle 9 in the left-right direction. By the way, in FIGS.
The drive shaft 53 and the fulcrum 44b are members that are arranged and fixed during the swinging movement of the needle bar swing table 18. On the other hand, the fulcrum 45a and the connection pin 46a rotatably connect the front and rear members and move the arrangement. It is a possible member. The needle swinging operation of the main needle swinging mechanism is linked to the vertical movement of the sewing machine needle 9 via the upper shaft 6, and when the sewing machine needle 9 descends an odd number of times, the needle bar 8 is moved to the baseline position, and At the time of the first time, the needle bar 8 is moved to the left swing position by a predetermined swing amount from the base line.

FIG. 7 is a diagram illustrating a change in the base line position by the needle swing mechanism, and FIG. 8 is a diagram illustrating a change in the swing width by the needle swing mechanism. The swing width change mechanism
As shown in FIG. 7, the position of the fulcrum 44b that determines the movement of the swinging cam lever 46 via the links 55 and 56 by the rotation of the swinging feed pulse motor 41 composed of a pulse motor or the like is determined by the swing width. The swing width of the sewing machine needle 9 is changed by changing the direction (approximately the left-right direction). As shown in FIG. 8, the base line changing mechanism is configured to rotate the base line feed pulse motor 40 including a pulse motor or the like.
By rotating the base line changing lever 43 about the fulcrum 43a, the fulcrum 4 which determines the movement of the needle swing cam lever 46 is determined.
By changing the position of 4b in the direction in which the origin of the swinging motion changes (substantially up and down direction), the baseline position of the swing of the sewing machine needle 9 is changed.

That is, the needle swing pulse motor 41
An X-feed drive means for driving the needle swing mechanism by the baseline feed pulse motor 40 and swinging the needle bar 8 right and left.

FIG. 9 is a configuration diagram of a cloth cutting mechanism (cloth cutting means) for forming a button hole by dropping into a button hole portion of a sewing object and cutting it. The cloth cutting mechanism includes a knife mounting plate 31 having a cloth cutting knife 16 attached to a lower end thereof, a drive arm 35 rotatably provided around a support shaft 35a and driving the knife mounting plate 31 up and down, and an upper shaft 6 of the sewing machine. A drive arm 36 which is linked to the drive shaft 36 and transmits the rotation of the upper shaft 6 to constantly move one end vertically at a high speed. The drive arm 35 which is detachably attached to the drive arm 36 and drives the drive arm 36 up and down. Drive hook 3 for transmitting to
7. The knife drive hook 37 and the knife drive arm 36
And a solenoid 75 for connecting / disconnecting the connection. And, at all times, the plunger 75 of the solenoid 75
a is pushed out, the knife drive hook 37 and the knife drive arm 36 are disconnected, whereby the cloth cutting knife 16 is stopped at an upper position. However, when the plunger 75a of the solenoid 75 is pulled back by the knife driving command, the knife driving hook 37 is pulled by the action of the spring 37b, and the engaging concave portion 37a is engaged with the knife driving arm 36. Then, the vertical movement of the knife drive arm 36 is transmitted to the knife drive hook 37 and the drive arm 35,
The knife mounting plate 31 is lowered on the cloth.

FIG. 10 shows the buttonhole overlock sewing machine 1
FIG. 2 shows a diagram of an operation panel 110 provided in the system. Operation panel 11
Numeral 0 is used for setting and inputting various sewing parameters, for displaying and outputting set values, and for displaying and displaying errors in sewing control. For example, on the sewing machine table on which the buttonhole sewing machine 1 is placed. Is provided. The parameters set and input using the operation panel 110 include a “double stitch overlap selection” parameter for selecting an overlapping pattern of the first and second round stitches during double stitching, and 1 The control panel 110 includes a parameter for selecting a bar-tacking portion for the first round so as not to sew the bar-tacking portion on the lap.

On the operation panel 110, a sewing key 131 for starting sewing and an LED (Light) for lighting the display indicating that the sewing key 131 is depressed and the sewing mode is set.
t Emitting Diode) display section 132, selection key 133 for selecting an input mode, pattern number display section 134 for displaying the input mode selected by operating the selection key 133 by lighting, and parameter number display section 1
35, a mode display section 141 comprising a 2-digit 7-segment display section, a parameter display section 142 comprising a 4-digit 7-segment display section, a minus key 143 for setting the input parameter value to "-1", and an input parameter value for "+1" A plus key 144, a down key 145 for subtracting an input parameter value in a predetermined unit, an up key 146 for adding an input parameter value in a predetermined unit, a set key 147 for notifying the threading of the sewing machine needle 9 and the positioning of the shuttle. Is provided.

FIG. 11 is a block diagram showing a circuit configuration of the buttonhole sewing machine 1. As shown in FIG. 11, a control device of the buttonhole sewing machine 1 includes a CPU (Central Prism).
ocessing Unit) 100, RAM (Random Access Memo)
ry) 102, ROM (Read Only Memory) 101, Y-feed counter 10 for counting the rotation amount of each pulse motor
3, a baseline feed counter 104, a needle swing feed counter 105, a cloth cutting knife counter 106 for counting the number of driving of the cloth cutting knife, a Y-feed pulse motor driver 111 for driving each pulse motor, a baseline feeding pulse motor driver 112, And needle vibration pulse motor driver 1
13, an I / O interface 109 for connecting the CPU 100 with the drivers and operation panel 110, etc. of various sensors and driving units, a sewing machine motor driver 115 for controlling the driving of the sewing machine motor 5 for driving the sewing machine, and the rotation amount of the sewing machine motor 5. The sewing machine motor encoder 119 that codes the rotation angle of the upper shaft 6, the active tension driver 120 that drives the upper thread tension VCM (voice coil motor) 60 of the thread tensioner 19, and the presser raising solenoid 122 that raises the cloth presser 15. A presser raising solenoid driving circuit 121 for driving; a cloth cutting knife lowering cylinder driving circuit 123 for driving a cloth cutting knife lowering cylinder 30 for lowering the cloth cutting knife 16; and a predetermined interrupt condition (counter indicating the rotation amount of each pulse motor). Value, cloth feed position, upper shaft 6 CPU100 by the rotation angle, etc.)
Controller 108 that outputs an interrupt signal to
And so on.

In addition to the sewing machine motor 5, the sewing machine motor driver 115 has a needle position sensor 116 for detecting that the sewing needle 9 is at the upper position, and a feed for detecting the reference positions of the cloth holder 15 and the cloth holding plate 14. Reference position sensor 11
7. TG (Tacho Generato) that detects the rotation angle of the upper shaft 6
r) The generator 118 and the like are connected. The I / O interface 109 includes a control panel 110, a driver and a driving circuit for each driving unit, a knife lowering detection switch 34 for detecting the lowering of the cloth cutting knife 16, and a presser lowering detecting switch for detecting the lowering of the cloth presser 15. 28, a Y-feed origin sensor 26 for detecting a state where the cloth feed (the cloth presser 15 and the cloth holding plate 14) is at the origin position, a baseline feed origin sensor 57 for indicating that the base position of the needle swing mechanism is at the origin, a needle swing Needle swing origin sensor 58 indicating that the swing width of the mechanism is at the origin, presser switch 1 for instructing lowering of cloth holder 15
24, a start switch 125 for instructing the start of driving of the sewing machine motor 5 and the like.

The CPU 100 inputs data from the operation panel 110, detection signals from various connected sensors, and receives signals via each driver according to a control program stored in the ROM 101 using a predetermined area of the RAM 102 as a work area. Controls various drive units. ROM101
Includes a setting input process for inputting various setting parameters from the operation panel 110, a calculation process for calculating single sewing and a plurality of types of double sewing patterns, and a buttonhole sewing based on a sewing pattern. Control data and control programs, such as a sewing process to be executed, are stored.
The calculation processing and the sewing processing will be described later in detail.

Button sewing machine 1 of this embodiment
Is configured as described above. As shown below, input of various setting data from the operation panel 110, calculation of each sewing pattern, and drive control of the buttonhole sewing machine 1 are performed, and various sewing patterns are formed. Buttonhole sewing is performed.

First, the items of the setting data input from the operation panel 110 will be described. FIG. 12 is a chart diagram of a data table showing data that can be input from the operation panel, and FIG. 13 is a diagram for explaining a parameter representing the length of each part of the sewing pattern. The data contents that can be input from the operation panel 110 are as shown in the parameter table of FIG.

That is, "cloth cutting length data", "scalpel width data", "bar tack length data", and "bar tack width data", which are the length data (see FIG. 13) of the sewing pattern of the buttonhole buttonhole. "," Parallel section pitch data "," Bar-tacking section pitch data "," Cloth cutting knife-1st bar-tack clearance length data "," Cloth cutting knife-2nd bar-tack clearance length data ", Also, “scalpel drop left / right position data” indicating the amount of deviation of the knife drop position in the left and right direction, “active tension correction data” indicating a correction value of the upper thread tension VCM 60 for applying tension to the thread tensioner 19, and at each sewing timing “Parallel portion tension data”, “bar tacking portion tension data”, “sewing start tension data”, “sewing end tension data”, “thread trimming tension data”, and “cloth” Resize size data, "press size data", "1/2 double switching data", "double stitching selection data", "double stitching / first lap knife drive data", and the feed position at the start of sewing. "Sew start position data" indicating the start of sewing, "Base line position data indicating the start of sewing (base position of the needle swing mechanism)" indicating the sewing start position, and "Sewing start time indicating the sewing machine speed when the cloth cutting knife 16 is driven. Sewing speed "data.

In these data items, the item number “1”
The data items according to the present invention include "1/2 double switching", "double sewing overlap selection", "first lap bar-tacking blinking", and "double lap sewing / first lap knife drive" of 8 "to" 21 ". . And
"1" or "2" in the data item of "1/2 switching"
By selecting, single stitch or double stitch is selected,
"0" or "1" in the data item of "double stitch overlap selection"
Select the parallel sewing function or the cross sewing function at the time of double sewing by selecting, and select "1" or "0" for the data item of "1st round At this time, one of the following functions is selected: the bar-tacking section for the first lap, which does not sew the bar-tacking section for the first lap, or the function for sewing the bar-tacking section for both the first and second laps. By selecting “0” or “1” in the data item of “1st lap knife drive”, whether or not to drive the scalpel in the first lap is selected.

When the user drives the buttonhole sewing machine 1, first, the above setting data is transferred to the operation panel 110.
Perform the setting input process to input from. Default data and previously input data are stored in advance in each data item to be input, and the user inputs and changes only data items that need to be changed. For each item of the setting data, setting range data indicating a range of data values that can be input corresponding to the item is stored in advance, and if data out of the setting range data is input, an error determination is made. Is being done. A plurality of sets of the above setting data can be registered in association with a sewing pattern number. When a user selects and calls an arbitrary sewing pattern number, a set of setting data corresponding to the number is read. Used for actual sewing control.

When the input of the setting data is completed, the cloth is set on the buttonhole sewing machine 1 and the sewing key 131 of the operation panel 110 is turned on. Then, first, a sewing pattern is calculated by the control unit based on the setting data. FIG. 14 and FIG. 15 are views showing sewing patterns calculated based on the setting data in the sewing order.

For example, when "1/2 switching data" is set to "2", "double stitching selection data" is set to "1", and "1st round bartacking and turning data" is set to "1". The cross sewing function and the bartacking / blinking function function to sequentially calculate the sewing patterns indicated by circled characters "14" in FIGS. Cloth sewing function, left parallel part A
This is a sewing pattern in which the stitches of the right parallel portion C (see FIG. 26) are shifted in the first and second turns, and the stitches are overlapped on the cross. By this cross sewing function, for example, points P _{2 to} P ₃ (FIG. 14) which are seams of the first turn of the left parallel portion A
)) And point P ₇ which is the second lap seam
ＰP ₈ (of FIG. 14) are shifted in the feed direction and overlapped on the cross. As shown in FIG. 14, this shifting is performed by stopping the cloth feed and performing one-stitch sewing on the needle swing side at the start of sewing of the left parallel portion A in the second round. The same applies to the cross sewing of the right parallel portion C.

Further, the bar-tacking and turning function is performed in the first and second bar-tacking portions B and D (see FIG. 26) without performing the normal bar-tacking sewing in the first lap, and performing the normal bar-tacking only in the second lap. Performs bar-tacking sewing. With this bar-tack sounding function,
For example, in the first bar-tacking portion B, points P _{3 to} P ₄ at the transition from the left parallel portion A to the right parallel portion C in the first lap (FIG. 14)
) Is performed, and on the second lap, points P ₉ to
The normal bar-tacking sewing of P ₁₀ (of FIG. 14) is performed. The same applies to the second bar tacking section D. Details of the transition sewing, as shown in FIG. 14, after entry from the end point P ₃ of the left parallel portion A in 2 stitch bar tacking portion, stops the cloth feed, then right parallel needle swing baseline part migrated in accordance with the C base line for sewing, further, while retracting the cloth feeding the Y feed direction, but such shifts to the start point P ₄ of the right parallel portion C. The same applies to the transition sewing (see FIG. 14) which shifts from the right parallel portion C to the left parallel portion A. FIG.
, Middle and white points indicate needle drop on the base line side.

In the setting process by the operation panel 110, "2
In the case where the parallel sewing function is selected with the "multiple stitching selection data" being "0", as described in the description of the cross sewing function,
Discard sewing at the start of sewing of the parallel part of the second round (Fig. 14)
By omitting the calculation of the above, the pattern calculation of the parallel stitching in which the stitch of the first turn and the stitch of the second turn overlap on the same line is performed.

In the setting processing by the operation panel 110, if the "first-lap bar-tapping and blinking data" is "0" and the bar-tapping and blinking function is not selected, the pattern calculation for transition sewing shown in FIG. 14 is performed. Instead, a normal bar-tack sewing pattern calculation is performed as a pattern in this process.

After the calculation of the sewing pattern, the drive timing of the cloth cutting knife 16 is calculated. If the "double sewing / first rotation knife drive data" is "0", the cloth cutting knife 16 is driven. As the timing, a predetermined timing during the sewing in the second cycle is calculated, and if "1", the predetermined timing during the sewing in the first cycle is calculated.

The details of these calculations will be described later with reference to flowcharts.

When the calculation of the sewing pattern is completed, the Y-feed pulse motor 20 based on the calculated sewing pattern
Base line feed pulse motor 40, needle swing feed pulse motor 4
1 is controlled, the sewing needle 9 is dropped at each coordinate of the calculated sewing pattern, and buttonhole drilling is performed.
Also, during the sewing, the cloth cutting knife 16 is dropped at the calculated predetermined timing to form a button hole, and a button hole is formed. Finally, the upper thread is cut by the upper thread cutting scissors 80, and the lower thread is cut by a thread cutting knife (not shown) below the needle plate, thereby completing one buttonhole drilling.

The processing procedure of the buttonhole buttoning processing including the sewing pattern calculation processing of the double sewing performed by the control unit of the buttonhole buttonhole sewing machine 1 will be described below in detail. FIG. 16 is a flowchart illustrating a general procedure of a button holing process performed by the control unit of the button holing machine. The buttonhole buttoning process is started, for example, when the buttonhole buttonhole sewing machine 1 is started.

When the buttonhole sewing machine 1 is started, first, in step S1, a subroutine process of an operation panel setting process is performed, and the process proceeds to step S2. In step S2, it is determined whether or not the sewing key 131 on the operation panel 110 is on. If the sewing key 131 is on, the process proceeds to step S3. If it is off, the process returns to step S1 to repeat the operation setting process. The processes of steps S1 and S2 are repeatedly performed at high speed until the sewing key 131 of the operation panel 110 is pressed. During this repetition, data input of all data items shown in FIG. I have.

When the sewing key 131 is depressed and the process proceeds to step S3, a subroutine process for calculating a sewing pattern and calculating the drive timing of the cloth cutting knife 16 based on the set data is performed in step S4. Move to In step S4, for example, RAM1
02 is read, and it is determined whether or not an error has been recorded in the previous step. If no error has been recorded, the process directly proceeds to step S6, and if an error has been recorded, the process proceeds to step S5. Operation panel 110
Is displayed on the display unit 140, and the button buttoning process is interrupted.

In step S6, a signal for lowering the cloth presser 15 is output to the presser lifting solenoid drive circuit 121, and the flow advances to step S7. In step S7, Y
Based on fine movements of the feed pulse motor 20, the base line feed pulse motor 40 and the needle feed pulse motor 41, and the detection outputs of the Y feed origin sensor 26, the baseline feed origin sensor 57 and the needle feed origin sensor 58, a cloth feed mechanism is provided. Then, each origin search of the needle swing mechanism is performed, and the process proceeds to step S8. In step S8, the Y feed pulse motor 20, the baseline feed pulse motor 40, and the needle swing pulse motor 41 are driven so that the sewing needle 9 is positioned above the first needle drop position at the start of sewing. Transition.

In step S9, a signal for raising the cloth presser 15 is output to the presser raising solenoid drive circuit 121, and the flow advances to step S10. In step S10, it is determined whether or not the sewing key 131 has been turned on. If the sewing key 131 is on, the process directly proceeds to step S11. If the sewing key 131 is off, the process returns to step S1. Step S
At 11, it is determined whether or not the press switch 124 is on. If the switch is on, the process directly proceeds to step S12. If it is off, the process returns to step S10 to repeat the processes of steps S10 and S11. When the presser switch 124 is pressed and the process proceeds to step S12, the detection output of the presser foot lowering detection switch 28 is read in this step, and if the cloth presser 15 is raised, the process proceeds to step S13.
Then, an output for lowering the cloth presser 15 is performed, and the process proceeds to step S15. However, if the presser foot 15 is lowered, the process proceeds to step S14, an output for raising the presser foot 15 is performed, and the process returns to step S10 again.

In step S15, the press switch 12
It is determined whether the ON operation has been performed. If the switch is ON, the process directly proceeds to step S16. If the switch is OFF, the process proceeds to step S14, where the cloth holder 15 is raised, and the process from step S10 is performed. Return. Step S16
Then, a start switch 125 for instructing a sewing start
It is determined whether or not has been turned on. If the button has not been turned on and remains in the off state, the process from step S15 is repeated. If the button has been turned on, the process proceeds to step S17. In step S17, according to the sewing data created in the sewing data creation process in step S3, the sewing machine motor 5 is driven to sew one buttonhole from the beginning to the end, and the cloth cutting knife 16 is driven. At the sewing timing, a sewing process for applying the tension set to the thread tensioner 19 is performed, and then, the process proceeds to step S18.

In step S18, for example, the RAM 102
The error flag is read, and it is determined whether or not an error has been recorded in the previous step. If no error has been recorded, the process directly proceeds to step S19, and if an error has been recorded, the process proceeds to step S20. Operation panel 110
Is displayed on the display unit 140, and the button buttoning process is interrupted. In step S19, a signal is output to the active tension driver 120, and the tension at the time of thread trimming set in the thread tensioner 19 is applied.
Move to 1.

In step S21, the upper thread trimming scissors 80 are operated to cut the sewing thread, and thereafter, thread trimming / lifting processing for raising the cloth presser 15 is performed, and step S2 is performed.
Move to 2. In step S22, the detection output of the presser foot lowering detection switch 28 is read, and after confirming the rise of the cloth presser 15, the process proceeds to step S23, where a signal is output to the active tension driver 120, and the tension of the thread tensioner 19 is adjusted. And returns to step S10, and repeats the processing from step S10 again.

FIG. 17 shows a step S of the general flow.
3 shows a flowchart of a subroutine process of the sewing data creation process performed in Step 3. When this subroutine is started, first, the setting data input in the previous operation panel setting process (step S1 in FIG. 16) is compared with the setting range (see FIG. 12) stored in the ROM 101. It is checked whether the setting data is included in the setting range. If not included, an error flag in the RAM 102 is set, and the routine goes to Step S32. Step S
At step S32, it is determined whether or not an error flag has been set in step S31. If the error flag has been set, this subroutine ends and the flow returns to the general flow. If not, the sewing pattern is sequentially calculated. The subroutine process of calculation (Step S33) and the knife drive timing calculation process of calculating the drive timing of the cloth cutting knife (Step S34) are executed, and this subroutine is terminated.

FIG. 18 shows a flowchart of a pattern calculation subroutine performed in step S33 of the sewing data creation processing. When the pattern calculation processing is started, first, in step S41, "sewing start feed position data" and "sewing start base line" input in the previous operation panel setting processing (step S1 in FIG. 17) and stored in the RAM 102. reading position data ", the coordinates pointed pointing these data as first needle drop point, and calculating a plurality stitches guided to the start position of the left parallel portion coordinates (points P ₁ to P ₂ in Figure 14), step The process moves to S42.

Thereafter, steps S42, S43, S4
In the branching process of S4 and S45, the branching process is performed to determine whether double stitching is performed when “1/2” switching data input in the operation panel setting process is “1” or double stitching is performed when “2”. (Step S42), branch processing of whether parallel sewing or cross sewing is performed when "double sewing overlapping selection data" is "0" (Step S43), and "1st round bar-tacking and turning data" is " Make a bar-tacking on the first lap with "0" or 1 with a "1"
Branch processing to determine whether or not to make bartacks on the lap (step S4
4, S45). If the double stitching is not performed, the parallel sewing with the double stitching is performed. If the bartacking blinking is not performed, steps S47 and S4 are performed.
In the calculation processing of step 8, the parallel sewing with double sewing and bar-tacking and blinking are performed, and in the processing of steps S 49 and S 50, the cross sewing with double sewing and the processing of bar-tacking without drilling are performed in steps S 51 and S 52. In the case of parallel sewing with double sewing and bar-tacking blinking, the processing is shifted to the arithmetic processing of steps S53 and S54. After performing the respective arithmetic processing, this subroutine is terminated, and the sewing data creation processing (FIG. Move to the next step of 17).

Here, the calculation A (step S46,
S47, S48, S50, S51) are normal buttonhole stitching calculation processing, calculation B (steps S49, S49).
53) is a buttonhole sewing operation for buttonhole stitching without bartacking, and operation C (steps S52 and S54) is a needle drop buttonhole stitch that is shifted by one stitch from the buttonhole buttonhole stitch of operation A. This is the calculation processing of the seam. Next, details of these will be described.

FIG. 19 shows a flowchart of the calculation A performed in steps S46, S47, S48, S50, and S51 of the pattern calculation process. In the processing of the calculation A, first, in the left-parallel portion calculation of step S61, the needle swing base line position “a1” of the left-parallel portion is determined based on the sewing data input in the operation panel setting process (step S1 of FIG. 16). 14 points and P ₂ of the baseline position) of the needle swing width "(d-b) /
2 "(see FIG. 13) and a feed pitch" e "(a value obtained by dividing the length of the left parallel portion by an appropriate integer). Thereafter, in the first bar-tacking section calculation of step S62, the first
A needle swing baseline position of the bar tacking portions "a2" (baseline position of the point P ₉ in FIG. 15), the needle swing width "d", dividing the feed pitch "f" (the length of the bar tacking portions with a suitable integer the calculation of the value), right parallel portion operation (step S63), the needle swing baseline position of the right parallel portion "a3" (baseline position of the point P ₄ in FIG. 14) and the needle swing width "(d-b) / 2 "and feed pitch" e "(value obtained by dividing the length of the left parallel portion by an appropriate integer)
The operation of the second bar tacking portion computed in (step S64), (baseline position of the point of Figure 15 P ₁₃₎ the second bar tacking portion needle swing baseline position of "a4", the needle swing width "d", The operation of the feed pitch “f” (the value obtained by dividing the length of the bar-tacking portion by an appropriate integer) is performed in the sewing end calculation (step S65) by the left parallel portion, the first bar-tacking portion, the right parallel portion, and the second. Calculate the total number of stitches by dividing each length of the bar-tacking section by the feed pitch. That is, by the processing of the calculation A, the stitches for one round of the normal buttonhole buttonhole are calculated.

FIG. 20 shows a flowchart of the calculation B performed in steps S49 and S53 of the pattern calculation process. In the processing of the calculation B, first, in the left parallel part calculation (step S71), the swinging baseline position “a1” of the left parallel part (FIG. 1)
4 points and P ₂ of the baseline position) of the needle swing width "(d-
b) / 2 "(see FIG. 13) and a feed pitch" e "(a value obtained by dividing the length of the left parallel portion by an appropriate integer).
After that, the first bar-tacking base line movement calculation (step S7)
In 2), the needle swing base line position “a2” of the first bar-tacking portion (FIG. 1)
5 the calculation of the point needle position of P ₉₎ of, the right parallel portion operation (Step S73), the needle swing baseline position of the right parallel portion "a
3 "(the baseline position of the point P ₄ in FIG. 14), needle swing width" (d-b) / 2 and "feed pitch" e "(value obtained by dividing the length of the left parallel portion at an appropriate integer) the operation, in Me second bar tack baseline moving operation (step S74), the operation of the needle swing baseline position of the second bar tacking portion "a4" (baseline position of the point P ₁₃ of FIG. 15), carried out respectively. That is, by the processing of this calculation B, the calculation of the seam for one round of buttonhole buttonhole without bartacking is performed.

FIG. 21 shows a flowchart of the calculation C performed in steps S52 and S54 of the pattern calculation process. In the processing of this calculation C, first, in the one stitch calculation of the pulse motor movement amount 0 (step S81), a calculation for forming one stitch stitch (stitch in FIG. 14) without operating the Y feed pulse motor 20. I do. Thereafter, sequentially, the left parallel portion operation (Step S82), the needle swing baseline position "a1" of the left parallel portion (the base line position of the point P ₂ in FIG. 14),
The calculation of the needle swing width “(db) / 2” (see FIG. 13) and the feed pitch “e” (the value obtained by dividing the length of the left parallel portion by an appropriate integer) is performed by the first bar-tacking portion calculation. (Step S83)
In a needle swing baseline position of the first bar tacking portion "a2" (baseline position of the point P ₉ in FIG. 15), the needle swing width "d", the feed pitch "f" (the length of the bar tacking portions suitable ). Next, in the one-needle calculation of the pulse motor movement amount 0 (step S84), the one-feed stitch (the circled character “12” in FIG. 15) without operating the Y-feed pulse motor 20 or each pulse motor of the needle swing mechanism is sequentially performed. an operation for forming a seam), the right parallel portion operation (step S85), the needle swing baseline position "a3" on the right parallel portion (the base line position of the point P ₄ in FIG. 14), the needle swing width "( d-
b) / 2 "and the feed pitch" e "(the value obtained by dividing the length of the left parallel portion by an appropriate integer) are calculated by the second bar-tacking section calculation (step S86). a needle swing baseline position "a4" (baseline position of the point P ₁₃ of FIG. 15), the needle swing width "d", the feed pitch "f" in the (divided by the appropriate integer length of the bar tacking portion) In the sewing end calculation (step S87), the calculation of the total number of stitches obtained by dividing each length of the left parallel portion, the first bar-tacking portion, the right parallel portion and the second bar-tacking portion by the feed pitch is performed. Do each. In other words, by the processing of the calculation C, the buttonhole buttonhole stitch of the calculation A has 1
The calculation of the stitches for one round of the buttonhole of the needle drop shape shifted by the needle is performed.

The above-described operations A, B and C are combined according to the set data by the pattern operation shown in FIG.
If the calculation A is repeated twice in step 8, the sewing pattern of the double stitch having exactly the same stitches in the first and second rounds is calculated, and in steps S49 and S50, the calculation B and the calculation A are combined. In this case, a sewing pattern in which the stitches of the parallel portions of the first and second rounds are the same (parallel sewing) and there is no bar-tacking sewing in the first round is calculated, and steps S51 and S5 are performed.
When the calculation A and the calculation C are combined in step 2, a sewing pattern in which the first and second round stitches cross each other in a cross shape (cross sewing) is calculated, and the calculation B is performed in steps S53 and S54.
When the calculation C is combined with the calculation C, a sewing pattern in which the stitches of the first round and the second round cross in a cross shape (cross sewing) and there is no bartacking sewing in the first round is calculated.

FIG. 22 is a flowchart of the knife drive timing calculation processing performed in step S34 of the sewing data creation processing of FIG. 7, and FIG. 23 is a flowchart of the knife drive needle number M used in this knife drive timing calculation processing. ₃ shows a chart explaining _n parameters. The scalpel drive timing calculation processing includes the number of times “n” of driving the cloth cutting knife 16 and the number of driving needles “M ₁ ” to “M _n ” of the cloth cutting knife 16 corresponding to each of the number of driving times “1” to “n”. (See FIG. 23). When the scalpel drive timing calculation process is started, first, in step S101, it is determined whether single stitching or double stitching is performed based on the setting data "1/2 switching data". The process branches to S103, and if double stitching, the process branches to Step S102. If the process has proceeded to step S102, it is determined whether the knife drive is the first or second lap from the setting data "during double stitching / first lap knife drive data". The process branches to step S104, and if it is the second round, the process branches to step S105.

When the process proceeds to step S103 as a result of the branching process in steps S101 and S102, FIG.
The number of stitches from the sewing pattern created in the pattern calculation process 8 to the start position of the right parallel portion is substituted for the variable M, and the routine goes to Step S106. If the process proceeds to step S104 as a result of the branching process, the number of stitches from the sewing pattern created by the pattern calculation process to the start position of the right parallel portion of the first round (point P _{4 in} FIG. 14) is set as a variable. Then, the process proceeds to step S106. As a result of the branch processing, in a case where the process proceeds to step S105, the stitch number variables to the starting position of the right parallel portion of the second lap from the sewing pattern created by the pattern operation process (point P ₁₀ in FIG. 15) Then, the process proceeds to step S106.

Then, from step S106 to step S
In each of the arithmetic processing operations 113, a button hole having a cloth cutting length “a” is made based on the “cloth cutting length data (a)” set and input and the “scalpel width data (L1)” of the cloth cutting knife 16. The number of times the cloth cutting knife 16 is driven “n” and n
The number of driving needles of the cloth cutting knife 16 up to the first time “M ₁ ” to “M _n ”
Is calculated. Drive stitch numbers A, shows the needle number for driving the cloth cutting knife 16, i.e., the number of stitches from the sewing start is "M _1" - the cloth cutting knife 16 at the time of "M _n" times are driven. That is, according to the knife drive timing calculation processing, in the substitution processing to the variable “M” performed in steps S103 to S105, the number of stitches of the right parallel portion in the first rotation is substituted, or By substituting the number of stitches for the right parallel portion, the same arithmetic processing (step S10)
6 to S113), the number of stitches for driving the cloth cutting knife 16 in the first round or the number of stitches for driving the cloth cutting knife 16 in the second round can be obtained.

FIG. 24 shows a flowchart of a sewing subroutine performed in step S17 of the general flow in FIG. When the sewing process is started, the total number of stitches of the sewing pattern calculated in the pattern calculation process is sequentially assigned to the “number of remaining threads” parameter (step S13).
1) A sewing machine start-up output for driving the sewing machine motor 5 is performed (step S132), and the process proceeds to step S133. In step S133, it is determined whether or not the state of the sewing machine is rotating. If the sewing machine is rotating, the process proceeds to step S134. Thereafter, until the state of the sewing machine stops, step S134 is performed.
-The high-speed loop processing of step S141 is repeated, and the actual sewing processing is performed during the repetition of this loop processing.

That is, in step S134, a process of exiting this loop is performed when the rotation state of the sewing machine is monitored and the sewing machine stops. In step S135, the rotation angle of the upper shaft 6 based on the TG generator 118 is monitored, and the process proceeds to step S136 at a timing when the rotation angle reaches the predetermined rotation angle. Then, in step S136, the Y feed pulse motor 20, the baseline feed pulse motor 40, and the needle swing pulse motor 41 are driven to move the needle drop position according to the sewing pattern obtained by calculation. That is, by the processing of steps S135 and S136, the cloth is fed according to the sewing pattern and the actual sewing is performed. In step S137, when the needle bar 8 has risen above the predetermined position based on the output of the needle position sensor 116, the process proceeds to step S138, where the number of stitches is counted and the number of stitches is counted. the number of driving times of the female 16 "M _1" -
When “M _n ” has been reached, the cloth cutting knife 16 is driven. In step S139, the feed reference position sensor 11
When the feed reference interrupt signal is input by the output from the control unit 7, the process proceeds to step S118, and the setting process when the cloth feed comes to the reference position in the step is performed in step S141.
Then, when the number of stitches is the number of times the cloth cutting knife 16 is driven, the driving check of the cloth cutting knife 16 is performed.

As described above, according to the control device for the buttonhole holing machine 1 of the present embodiment, "when double sewing
By selecting "1" for the setting parameter of "circle knife drive", the cloth cutting knife 16 is driven in the first round, and the buttonhole portion is already cut at the time of sewing in the second round. The piece of cloth formed by the cloth cutting knife is
It is caught inside the overlock stitch, and the piece of cloth is not exposed to the outside as it is. That is, beautiful sewing is realized in which a piece of cloth is not exposed as it is.

When “0” is selected as the setting parameter of “double sewing overlap selection”, the cross sewing function is used to select “2”.
Since the first and second lap seams overlap in a cross shape during heavy sewing, compared to the conventional sewing pattern in which the first and second lap seams overlap on the same line and double. And beautiful sewing patterns can be realized. Further, since the cross sewing is performed only on the parallel sewing portions where the cross sewing is effectively conspicuous, unnecessary sewing is omitted, and the time of the sewing cycle and the number of stitches can be minimized. Also, "2
By selecting the setting parameter of "selection of heavy sewing overlap", the sewing pattern of the conventional double sewing by the parallel sewing function and the stitch by the cross sewing function can be selected, so that the variation of the sewing pattern is abundant.

When "1" is selected as the setting parameter of "1st round bar-tacking", double stitching is performed only on the parallel portion having a low seam density, and double-sealing is performed at the bar-tacking portion having a high seam density. Since the sewing is not performed, unnecessary swelling of the bar-tacking portion which is required in the conventional double sewing is eliminated, and a beautifully finished sewing can be realized. Also, by selecting the setting parameter of "1st round bar-tacking loop", the conventional sewing pattern in which the bar-tacking section is double sewn and the sewing pattern by the first round bar-tacking loop sewing function can be selected. Variations will be rich.

The present invention is not limited to the control device for the buttonhole sewing machine 1 of the above-described embodiment. For example, the Y-feed drive means and the X-feed drive means connected to the control device may be used in this embodiment. It is not limited to the form specifically shown,
For example, the feed in the X feed direction may be performed not by needle swing but by cloth feed, and a pulse motor has been described as a driving unit, but there may be various other configurations such as a servo motor. In addition, the sewing pattern of buttonhole buttoning can be applied to a sewing pattern in which a bar-tacking portion is formed radially around the end of the buttonhole. In addition, the following variations can be made in the processing procedure of the double stitching.

FIG. 25 shows an outline of a flowchart of another example of the button holing process. That is, in this embodiment, as a processing procedure for performing the double stitching, the sewing pattern of the double stitching is calculated at the time of calculating the sewing pattern, and the double stitching is performed by performing the sewing process according to the sewing pattern. However, the present invention is not limited to such a processing procedure. For example, as shown in FIG. 25, it is determined whether or not to perform double stitching at the stage when the first round sewing processing (step S201) is completed (step S202). If it is to be performed, the second round sewing process (step S202) is executed. If not, the sewing process is terminated. Thereafter, the cloth holder 15 is raised (step S204), and the button holing process is performed. A processing procedure of terminating the processing may be adopted.

[0072]

According to the first aspect of the present invention, since the buttonhole portion is already cut at the time of the second round sewing,
A piece of cloth formed by the cloth cutting knife is entangled inside the overlock stitch in the second round, and the piece of cloth is not exposed to the outside as it is. That is, beautiful sewing is realized in which a piece of cloth is not exposed as it is. In addition, the buttonhole is formed by the cloth cutting knife after the first round overlock seam is formed, and then the second round overlock seam is formed. The effect to be obtained is obtained.

According to the second aspect of the present invention, the conventional sewing pattern of the double sewing by the parallel sewing function and the sewing pattern by which the stitches by the cross sewing function overlap in a cross shape are provided.
Since the selection can be made by the above selection means, a variety of sewing patterns can be provided.

According to the third aspect of the present invention, double stitching is performed only in the parallel stitching portion having a low stitch density, and double stitching is not performed in the bar tacking portion having a high stitch density.
Unnecessary swelling of the bar-tacking portion, which is required in conventional double stitching, can be eliminated, and beautifully sewn sewing can be realized, and thread breakage can be prevented.

According to the fourth aspect of the present invention, the conventional sewing pattern in which the bar-tacking portion is also double-stitched and the sewing pattern by the first-turn bar-tacking / blinking sewing function can be selected by the selection means. The variation of the pattern becomes rich.

[Brief description of the drawings]

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

FIG. 2 is a perspective view mainly showing a cloth feeding and a needle elevating mechanism of the buttonhole holing machine;

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

FIG. 4 is a configuration diagram showing details of a needle swing mechanism of the buttonhole holing machine.

FIG. 5 is a schematic diagram for explaining the operation of the needle swing mechanism.

6A and 6B show an operation example of the needle swing mechanism, and FIG.
Is a diagram showing a state where the cam top of the needle swing cam is on the base line side,
(B) is a diagram showing a state in which the cam top of the swinging cam is on the cam swing width side.

FIG. 7 is a diagram showing a change in the base line position by the needle swing mechanism.

FIG. 8 is a diagram showing a change of a swing width position by the needle swing mechanism.

FIG. 9 is a view showing a configuration of a cloth cutting means for operating a cloth cutting knife.

FIG. 10 is a diagram showing an operation panel provided on the buttonhole sewing machine according to the embodiment.

FIG. 11 is a block diagram showing a circuit configuration of the buttonhole sewing machine.

FIG. 12 is a chart of a parameter table showing parameters that can be input from the operation panel.

FIG. 13 is a diagram illustrating a variable representing the length of each part of the sewing pattern.

FIG. 14 is a view showing sewing patterns of sewing procedures 1 to 7 of “double sewing” by the cross sewing function.

FIG. 15 is a diagram showing sewing patterns of sewing procedures 8 to 14 of “double sewing” by the cross sewing function.

FIG. 16 is a flowchart illustrating a general procedure of a button holing process performed by a control unit of the button holing machine.

17 is a flowchart showing a processing procedure of a sewing data creation subroutine in the general flow of FIG. 16;

18 is a flowchart showing a processing procedure of a pattern calculation subroutine in the sewing data creation subroutine of FIG.

19 is a flowchart showing a processing procedure of a calculation A in the pattern calculation subroutine of FIG.

20 is a flowchart showing a processing procedure of a calculation B in the pattern calculation subroutine of FIG.

FIG. 21 is a flowchart showing a processing procedure of a calculation C in the pattern calculation subroutine of FIG. 18;

FIG. 22 is a flowchart showing a processing procedure of a knife drive timing calculation subroutine in the sewing data creation subroutine of FIG. 17;

FIG. 23 is a table illustrating the number _Mn of knife drive stitches in the knife drive timing calculation subroutine of FIG. 22;

FIG. 24 is a flowchart showing a processing procedure of a sewing subroutine in the general flow of FIG. 16;

FIG. 25 is a flowchart illustrating another example of the button holing process performed by the control unit of the button holing machine.

FIG. 26 is a diagram for explaining each sewing portion of the buttonhole buttonhole.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 Buttonhole sewing machine 6 Upper shaft 8 Needle bar 9 Sewing needle 14 Cloth holding plate 15 Cloth retainer 18 Needle bar swing table 20 Y feed pulse motor (Y feed drive means) 40 Baseline feed pulse motor (X feed drive means) 41 Needle swing feed pulse motor (X feed drive means) 80 Upper thread cutting scissors 100 CPU (control means) 110 Operation panel (selection means)

Claims (4)

[Claims] 1. A buttonhole overlock sewing machine comprising sewing means for sewing so as to go around a buttonhole of a workpiece and a cloth cutting knife for cutting the buttonhole of the workpiece. The sewing around the button hole portion is performed at least two times by the sewing means, and the cloth cutting knife is operated at the time of the first sewing to cut the button hole portion. A buttonhole sewing machine comprising a control unit that does not operate. 2. A needle feeding position is controlled by a cloth feed mechanism for feeding a workpiece in the X-Y direction, a cloth feeding mechanism for feeding the workpiece in the Y direction, and a needle swing mechanism for swinging the sewing machine needle in the X direction. In a buttonhole overlock sewing machine that moves in the X-Y direction on a sewing product and circulates around the buttonhole portion of the sewing product, the cloth feed mechanism is moved in the Y direction by electric driving. Feed drive means, X feed drive means for moving the cloth feed mechanism or the needle swing mechanism in the X direction by electric drive, and controlling the Y feed drive means and X feed drive means,
The sewing around the button hole portion is performed two rounds, and the needle drop position is shifted between the first round sewing and the second round sewing so that the first round sewing path and the second round sewing path are formed in a cross shape. The cross sewing function to be crossed and the sewing around the button hole portion are performed two times, and the needle drop position is set to be substantially the same between the first and second rounds, and the sewing route and the second round are set. A buttonhole sewing machine, comprising: a parallel sewing function for making a circumferential sewing path substantially parallel to the sewing path; and a selection means for selecting one of the cross sewing function and the parallel sewing function. 3. A parallel sewing portion parallel to a linear button hole portion provided on a sewing object and a bar-tacking sewing portion at both ends of the button hole portion are circulated around the button hole portion. In the buttonhole overlock sewing machine provided with sewing means, sewing around the buttonhole portion is performed at least two times by the sewing means, and the bar-tacking sewing portion is not sewn at the time of the first sewing. A buttonhole sewing machine comprising a control means having a first round bar-tacking blind sewing function for sewing a bar-tacking sewing portion at the time of sewing of a circumference. 4. The first round bar-tacking blind sewing function,
4. The buttonhole buttonhole sewing machine according to claim 3, further comprising a selection means capable of selecting any one of a sewing function for performing sewing of the bar-tacking sewing portion in both the first and second rounds.