JP2002200377A - Buttonholing sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of the setting work in a buttonholing sewing machine. SOLUTION: This buttonholing sewing machine 100 is provided with a knife receiving base 17 driven by a cloth cutting motor 21 and capable of controlling a descent quantity, a RAM(random access memory) 3 storing a plurality of pattern data for forming seams around a buttonhole, an operation panel 5 for selecting one of a plurality of holing control data, and a CPU 1 forming over casting seams around the buttonhole and lowering the knife receiving base 17 from a prescribed reference position to a cloth cutting position to form the buttonhole based on the pattern data selected by the operation panel 5. The pattern data include a correction descent quantity for correcting the descent quantity of the knife receiving base 17, and the CPU 1 drives the knife receiving base 17 based on the fixed reference descent quantity and the correction descent quantity included in the selected pattern data.

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 and, more particularly, to setting a descending amount of a knife holder or a cloth cutting knife for cutting cloth.

[0002]

2. Description of the Related Art Conventionally, there has been known an electronic buttonhole overlock sewing machine which automatically opens a buttonhole and performs overlock sewing around the buttonhole. In such a buttonhole overlock sewing machine, a plurality of pattern data are stored with respect to the size and shape of the buttonhole overlock sewing that can be formed, and a predetermined buttonhole overlock sewing is performed by calling one of them on the operation panel. .

[0003] Fig. 11 shows a table of conventional pattern data when performing an eyelet buttonhole sewing, which is one type of buttonhole. Here, nine types of pattern data can be stored, and one pattern data has 1 to 7 data items. Data item 1 sets the shape of the eyelet portion of the eyelet hole. As shown in FIG. 12C, the size of the eyelet C is defined by the horizontal width ew and the vertical length el, and the combination of these ew and el is shown in FIG.
It is stored in advance as a table as shown in FIG.
In the data item 1, a numeral is selected from among them (1 to 5). Data items 2 to 6 are shown in FIG.
This is data relating to the number of needles and the length of each part constituting the eyelet buttonhole shown in FIG. That is, data item 2 has a hole length (ml in FIG. 12), data item 3 has a parallel stitch number (ln in FIG. 12), and data item 4 has an eyelet stitch number (FIG. 12).
En), data item 5 is a parallel part female space (FIG. 12)
Ls), data item 6 is eyelet female space (FIG. 12)
Es). Data item 7 is to select a scalpel for performing cloth cutting before overlock sewing and a scalpel for performing cloth cutting after overlock sewing.

[0004] By the way, in a buttonhole sewing machine, a knife holder and a cloth cutting knife are provided near the sewing needle so as to face up and down. Then, with the cloth placed on the cloth cutting knife, the knife receiving base is driven downward,
A button hole is formed by pressing against a cloth and a stool holder. Further, the cloth cutting knife is longer than the knife holder, and the knife holder is replaced when the above-mentioned boring length is changed. The amount of downward drive of the knife holder is a fixed distance based on the distance between the origin (top) position of the knife holder and the cloth cutting knife,
For example, 20 mm is set as the reference amount. However, it is necessary to correct according to the actual situation. For example, the scalpel holder has a different height for each product, and the cloth cutting scalpel is gradually attached during repeated use, so that the mark may be cut off for maintenance. In this case, since the height of the scalpel holder is reduced, it is necessary to make the driving amount larger than the reference amount. In addition, if the same cloth is thicker, it is necessary to increase the indentation amount as it is thicker, and thin cloth is harder to cut than thick cloth,
It is necessary to push the scalpel holder against the cloth cutting knife by that amount, and in these cases, it is necessary to increase the driving amount.

[0005] Generally, a knife holder and a cloth cutting knife are
The upper and lower positions of the cloth cutting knife can be inverted. When the cloth cutting knife is installed in the opposite direction, the cloth cutting knife is driven downward with respect to the knife receiving table. Therefore, in the conventional hole hog sewing machine, it is possible to set the amount of descent at the time of the descent drive of the knife holder or the cloth cutting knife on the operation panel.

[0006]

However, the correction descent amount is set as completely different data from the pattern data shown in FIG. Therefore, as described above, when it is necessary to change the descent amount by replacing the knife holder or changing the cloth, it is necessary to reset the descent amount in addition to reselecting the pattern data. The work was troublesome. Also, since only one descent amount could be set, if a specific knife holder or specific cloth is used repeatedly after a while, make a note of the descent amount in a notebook and write the value down. It had to be set every time sewing was performed, resulting in poor workability.

It is an object of the present invention to improve the efficiency of setting work in a buttonhole sewing machine.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is, for example, as shown in FIGS. 1 to 10, a knife receiving base (18) or a cloth cutting knife (1).
7) an electric drive means (cloth cutting motor 21) capable of electrically controlling either one of the descending amounts, and a buttonhole and a buttonhole control data (pattern data) for forming a buttonhole buttonhole seam. Storage means (RAM
3), a control data selecting means (operation panel 5) for selecting one of the plurality of holing control data, and a button hole based on the holing control data selected by the control data selecting means. A buttonhole sewing machine (10) having a control means (CPU1) for forming a buttonhole by forming an overlock seam around the periphery and lowering a knife receiving stand or a cloth cutting knife from a predetermined reference position to a cloth cutting position to form a buttonhole.
In 0), the drilling control data includes descent amount specifying data for specifying the descent amount of the knife holder or the cloth cutting knife, and the control means controls the descent amount specifying data included in the selected drilling control data. The knife receiving stand or the cloth cutting knife is driven by a descending amount corresponding to (1).

According to the first aspect of the present invention, the storage means stores a plurality of drilling control data including descent amount specifying data for specifying the descent amount of the knife holder or the cloth cutting knife, If one of them is selected by the control data selection means, the knife receiving table or the cloth cutting knife is driven based on the selected drilling control data under the control of the control means. Therefore, if the descent amount specifying data is set for each drilling control data, for each knife holder, or for the quality and thickness of the fabric, simply select the drilling control data and press the button. Along with the change of the overall shape of the hole drilling stitch, the descending amount of the knife holder or cloth cutting knife is also set, and the setting work only for the descending amount of the knife holder or cloth cutting knife becomes unnecessary, and the setting work is made more efficient. I can do it. Here, the "over-hole control data" is composed of data such as length data and number of stitches required for button over-hole sewing, and determines the shape and size of the button over-hole sewing. Is what you do. Further, at the time of sewing, needle drop data for determining a needle drop position may be created based on the "holing control data".

According to a second aspect of the present invention, in the buttonhole holing machine according to the first aspect, for example, as shown in FIG. 6, the downward amount specifying data is correction data for correcting the downward amount as a reference. Wherein the control means drives the knife holder or the cloth cutting knife based on the reference descent amount and the correction data.

According to a third aspect of the present invention, in the buttonhole holing machine according to the first aspect, for example, as shown in FIG. 9, the descending amount specifying data is the total descending amount of the knife receiving table or the cloth cutting knife. There is a feature.

According to a fourth aspect of the present invention, in the buttonhole holing machine according to the first aspect, for example, as shown in FIG. 10, the total descending amount of the knife receiving stand or the cloth cutting knife or the reference descending amount is determined. A descent amount data table (table t1) for storing a plurality of correction data for correction is provided.
It is characterized by being data for specifying two data.

The buttonhole buttonhole sewing machine according to any one of the first to fourth aspects, as in the invention according to the fifth aspect, a changing means (operation panel 5) for changing the content of the descending amount specifying data.
May be provided.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. As an example of the present invention, FIGS.
Buttonhole sewing machine (hereinafter referred to as sewing machine) 10 shown in FIG.
No. 0 forms an eyelet-shaped button hole by automatic control and performs overlock sewing around the button hole. In order to form an eyelet hole, a female cradle 17 and
A cloth cutting knife (hereinafter, also referred to as a knife) 18 is provided on the knife receiving table 17 so as to face up and down. With the cloth placed on the scalpel 18, the scalpel holder 17 is lowered to press the scalpel 18 and the cloth, thereby forming an eyelet. Note that FIG.
7 shows a state in which the knife 7 is lowered onto the knife 18, and FIGS. 2 and 3 show a state in which the knife holder 17 is kept at the origin position.

Here, the knife driving means for driving the knife holder 17 will be described. As shown in FIGS. 1 to 4, the knife receiving table driving means is schematically constituted by a cloth cutting motor 21 which is a pulse motor, a ball screw 24, a link arm 31, a driving shaft 35, a driving gear 39 and a linear motion shaft 40. ing. The cloth cutting motor 21 which is an electric driving means is fixed to the bed 101, and the driving force of the cloth cutting motor 21 is transmitted to the meshing ball screw gear 23 via the motor gear 22. The ball screw gear 23 is attached to a ball screw 24 provided in a direction perpendicular to the sewing machine 100 so as to be rotatable. Therefore, the ball screw 24 is rotated via the ball screw gear 23 by the driving force of the cloth cutting motor 21. The ball screw nut 27 provided on the ball screw 24 can move up and down along the ball screw 24 by rotation of the ball screw 24. A housing 28 is fixed above the ball screw nut 27 and moves up and down together with the ball screw nut 27. As shown in FIG. 3, a guide 29 is fixed to the housing 28. By inserting a guide shaft 30 into the guide 29, the housing 28 and the ball screw nut 27 move up and down without rotating. ing.

Two link arms 31 are provided so as to sandwich both side surfaces of the housing 28 (only one in FIG. 3), and one end of each is rotatably attached to both side surfaces of the housing 28, and the other end is provided. The link shafts 32b, 32b are rotatably fixed to one end of a bifurcated lever 34. As shown in FIG. 4, the drive shaft 35 is substantially parallel to the sewing machine frame 103 and is rotatably supported. The other end of the lever 34 is rotatably attached to one end of the drive shaft 35. The drive shaft 35
Has a lever receiver 35 a rotatably mounted integrally with the drive shaft 35, and a part of the lever receiver 35 a
Is in contact with When the lever 34 is driven via the link arm 31 and the one end side (link arm 31 side) is rotated about the drive shaft 35 as a fulcrum, the lever receiver 35a is pushed down by the lever 34, and the drive shaft 35 rotates. A drive gear 39 is fixed to the other end of the drive shaft 35. This drive gear 39
As shown in FIG. 2, the gear meshes with a rack 41 formed on the upper portion of the linear motion shaft 40, and rotates together with the drive shaft 35 to move the linear motion shaft 40 up and down.

The linear motion shaft 40 is housed in a substantially cylindrical linear metal 42 with the drive gear 39 side cut out, and the linear metal 42 provided on two inner surfaces of the linear metal 42. Groove portions 43, 43 extending in parallel with the longitudinal direction of the linear motion shaft 40, and convex portions 44,
44 is slidable up and down without rotating left and right by fitting movably along the grooves 43. At the lower end of the linear motion shaft 40, a knife mounting base 51 is provided.
7 is attached. The scalpel 18 is mounted on a receiving base 61 provided on the bed portion 101 immediately below the scalpel receiving base 17.

As shown in FIG. 4, a slit plate 45 is attached to the drive shaft 35, and a sensor 46 for detecting the origin position (corresponding to the uppermost position of the knife holder 17) is fixed. ing. The sensor 46 detects whether or not the knife holder 17 is at the origin position based on, for example, a change between a state where the slit plate 45 is covered and a state where the slit plate 45 is not covered.

Next, the operation of the method for driving the knife holder 17 by the knife holder driving means as described above will be described. When the cloth cutting motor 21 operates, the ball screw 24 rotates via the motor gear 22 and the ball screw gear 23, and the ball screw nut 27 and the housing 28 descend on the ball screw 24. As a result, the two link arms 31 connected to the housing 28 are also lowered, and one end of the lever 34 is moved to the position shown in FIG.
Push down clockwise at. Further lever 34
Rotates the drive shaft 35 clockwise in FIG. 3 via the lever receiver 35a. When the drive shaft 35 rotates,
The drive gear 39 provided on the drive shaft 35 rotates counterclockwise in FIG. 2, and the linear motion shaft 40 having the rack 41 meshing with the drive gear 39 descends, whereby the knife receiving table 17 descends, The sewing object (not shown) on the cloth cutting knife 18 is cut.

After the cutting, the cloth cutting motor 21 is rotated in the reverse direction to move the ball screw nut 27 and the housing 28 upward, whereby the lever 34 is rotated, and the pressing of the lever 34 to the lever receiver 35a is released. The drive shaft 35 rotates counterclockwise in FIG. 3 by the urging force of the spring 35b shown in FIG. 4, and the drive gear 39 rotates clockwise in FIG. Move away from the work.

FIG. 5 shows a control circuit 110 of the sewing machine 100.
showed that. The control circuit 110 includes a CPU 1, a ROM 2, an R
AM3 and interfaces 4a, 4b, 4c ...,
It is composed of various drive circuits, an operation panel 5, a start switch 16, and the like. ROM (read only memory) 2
A control program and control data for performing eyelet buttonhole sewing are written.

The RAM 3 (random) which is the storage means of the present invention
The access memory stores a plurality of pattern data (holing control data), stores one pattern data selected via the operation panel 5, and changes the value of a data item in the pattern data. In the case where it is performed, the value and the like are also stored. More RAM
Reference numeral 3 also functions as a memory area temporarily used in various processes during sewing. Further, stitch data (described later) generated from the pattern data is also stored.

FIG. 6 shows an example of the pattern data stored in the RAM 3. The RAM 3 stores nine pattern data, and each pattern data includes a pattern No. As shown by 1, specific values are set corresponding to the data items 1 to 8. Data items 1 to 7 are shown in FIG.
This is the same as the conventional pattern data shown in FIG. That is, the shape and size of the eyelet buttonhole sewing are determined by the data items 1 to 6. Further, for the data item 7, a choice is made between a leading knife and a trailing knife. Data item 8 is for setting the distance of the corrected descending amount of the knife holder 17. In the sewing machine 100, the reference lowering amount of the knife holder 17 is 20 mm.
Fixed to. Then, the correction lowering amount is set in accordance with the replacement state of the knife holder 17 or the sewing state of the cloth or the like, and the knife holder 17 is driven by "20 mm + correction lowering amount". Here, the corrected descending amount is the descending amount specifying data.

CPU (Central Processing Unit) 1
Is control means of the present invention for controlling a series of processes relating to eyelet buttonhole stitching according to a control program and control data in the ROM 2. The CPU 1 is connected to the operation panel 5 via the interface 4f.
The display is controlled, and various settings are selected and changed in response to an input signal input via the operation panel 5. The operator can select the pattern data shown in FIG. 6 via the operation panel 5 and change the number of each data item of the selected pattern data. The operation panel 5 will be described later.

The CPU 1 further includes an interface 4
a, and is connected to the spindle servomotor drive circuit 6 through
The drive of the spindle servomotor 7 is controlled. The spindle servomotor 7 is a motor that drives an upper shaft that drives the sewing machine needle up and down and a looper mechanism that forms a seam in cooperation with the sewing machine needle. The CPU 1 has an interface 4
b, is connected to the X-axis pulse motor drive circuit 8 via the interface 4c, and is connected to the Y-axis pulse motor drive circuit 10 to control the X-axis pulse motor 9 and the Y-axis pulse motor 11, A feed table (not shown) for feeding the cloth is driven in a predetermined direction. The CPU 1 is connected to the Z-axis pulse motor drive circuit 12 via the interface 4d, and controls and drives the Z-axis pulse motor 13. The Z-axis pulse motor 13 rotates the sewing machine needle and the looper to form a radial seam s1 (FIG. 12) around the eyelet hole C. The CPU 1 controls the cloth cutting pulse motor driving circuit 14 via the interface 4e.
And drives the cloth cutting motor 21 in a controlled manner. CPU
1 is connected to the start switch 16 via the interface 4f, and when a start signal is input from the start switch 16, drives the spindle servomotor 7 and the like at predetermined timing to perform buttonhole sewing and cloth cutting. .

As shown in FIG. 7, the operation panel 5, which is a selection means and a change means in the present invention, mainly comprises a preparation switch P
13, a pattern number selection unit 5a, a knife after knife display unit 5b, a data item selection unit 5c, a data value setting unit 5d,
And a data setting switch P6. The pattern number selection section 5a is for selecting a pattern number, and the currently selected pattern number is displayed on the pattern display section P1 ("1" in FIG. 7). Use the + key P2 and the-key P3 below the pattern display section P1 to set the number to 1
Different pattern data can be selected by changing one by one in the range of ~ 9.

The data item selection section 5c selects a data item in the pattern data selected by the pattern number selection section 5a. The currently selected data item is displayed in the item display section P10 ("5" in FIG. 7). By changing the numbers one by one in the range of 1 to 8 with the + key P11 and the − key P12 below the item display portion P10, different data items can be selected. When a data item is selected in the data item selection section 5c, a number preset for the data item is displayed in the value display section P7 of the data value setting section 5d. The value can be changed by increasing / decreasing the number of the value display portion P7 by a predetermined interval within a predetermined range by using the + key P8 and the − key P9 below the value display portion P7. In addition, an LED is provided on the knife display section 5b after the first knife.
A leading knife indicator light P4 and a trailing knife indicator light P5 made of (light emitting diodes) are provided. The data item selection section 5c selects number 7 as a data item.
When "1" indicating the leading knife or "2" indicating the trailing knife is selected in the data value setting section 5d, the leading knife indicating light P is correspondingly selected.
4. One of the rear knife indicator lights P5 is turned on. FIG. 7 shows a state where the leading knife is selected.

The value display section P7 of the data value setting section 5d
, "-0.2" is displayed corresponding to the parallel space of the data item "5". In the case of the leading knife, the needle drop position on the knife hole side of the overlock stitch is smaller than the cutting line. This is for setting to enter inside. The data setting switch P6 is a switch operated when performing a data setting operation. That is, when the data setting switch P6 is pressed,
Thus, the data value can be changed. The selection or change of each item or number is determined by pressing the data setting switch P6 again. The preparation switch P13 is a switch for creating stitch data including needle drop data corresponding to the data value selected or reset after the completion of the setting operation.

FIG. 8A shows a general flow of buttonhole overlock sewing by the sewing machine 100. The general flow is, for example, a main power supply (not shown) of the sewing machine 100.
Is turned on. First, in step A1, a process is performed to determine whether or not the + key P2 and the-key P3 of the pattern number selection section 5a have been operated to change the pattern data number. Step A
In step 2, the pattern number is updated, and the process proceeds to step A3. If it is determined in step A1 that the data has not been changed, the process directly proceeds to step A3. In step A3, it is determined whether or not the data setting switch P6 has been operated. If the data setting switch P6 has been operated, the process enters the data setting mode and performs data setting processing in step A4. This data setting process will be described later. After step A4, or when it is determined in step A3 that the data setting switch P6 has not been operated, the process proceeds to step A5.

In step A5, it is determined whether the preparation switch P13 has been operated. If the operation is not performed, the process returns to step A1, and if the operation is performed, stitch data is created in step A6. This stitch data is generated to drive a drive source such as the spindle servomotor 7 based on the data content of the selected pattern data, and needle drop data for determining the needle drop position of the sewing needle. And data such as the driving amount of the cloth cutting motor 21 for driving the knife receiving table 17. Next, in step A7, the feed bar is moved to the origin position, and the needle bar and the looper are also moved to the origin position in the Z-axis rotation. Next, in step A8, it is monitored whether or not the start switch 16 has been turned on, and if it has been turned on, the process proceeds to step A9. In step A9, it is determined whether or not the leading knife is selected in the data item "7" in the pattern data. If it is the first knife, a knife driving process is performed in step A10. This knife driving process will be described later. After step A10 or when it is determined in step A9 that it is not the first knife,
The process proceeds to step A11, where processing for moving the feed stand to the sewing start position is performed.

Next, in step A12, a boring operation is performed. After the sewing of the predetermined number of stitches, the process proceeds to step A13, where the feed base, the needle bar and the looper are moved to the origin position as in step A7. Then, step A
At 14, it is determined whether or not the rear knife has been selected in the data item "7" in the pattern data. If the rear knife has been selected, the process proceeds to step A15 to perform the knife driving process.
After step A15 or when it is determined in step A14 that the knife is not a back knife, the process returns to step A8, and waits for operation of the start switch 16 again. If the start switch 16 is pressed, the boring operation is repeated. Can be.

FIG. 8B shows a flowchart of the data setting process in step A4. First, in step B1, the display of the item display section P10 on the operation panel 5 is set to "1".
Eyelet shape 1 currently set in the value display section P7
Any one of the values of ~ 5 is displayed. Then, step B2
It is determined whether or not the data item number has been changed by the + key P11 and the-key P12. If so, the data item number is updated in step B3, and the display of the item display section P10 and the value display section P7 is changed. . After step B3 or when it is determined in step B2 that the data item number has not been changed, step B4
Move to In step B4, the value of the currently selected data item (the value displayed in the value display section P7) is
It is determined whether or not it has been changed by the + key P8 and the-key P9, and if not, the process proceeds to step B6. If the value has been changed, in step B5, the data value is updated in accordance with the selected data item, the display content of the value display portion P7 is changed, and the process proceeds to step B6. In step B6, it is determined whether or not the data setting switch P6 has been operated. If the data setting switch P6 has been operated, the updated data value is updated in step B7, and the process returns to step A5. If it is determined in step B6 that the data setting switch P6 has not been operated, the process returns to step B2.

FIG. 8C shows steps A10 and A
15 shows a flowchart of the knife driving process. First,
In step C1, the knife holder 17 is lowered by the distance corresponding to the corrected lowering amount of the selected pattern data in addition to the reference lowering amount (20 mm). Next, in step C2, the operation is stopped for 50 milliseconds while being lowered. Next, in step C3, the scalpel holder 17 is raised and returned to the original position, and this processing ends.

According to the sewing machine 100 described above, the RAM 3
A plurality of pattern data including correction data of the descending amount of the knife receiving table 17 are stored. When one of them is selected by the operation panel 5, under the control of the CPU 1, based on the selected pattern data, And female cradle 17
Is driven. Therefore, if the correction descent amount is set for each pattern data, for each knife holder, or for the quality and thickness of the fabric, simply selecting the pattern data will allow the entire buttonhole overlock sewing to be performed. Along with the change of the shape, the descending amount of the knife receiving table 17 is set, so that the work only for setting the descending amount of the knife receiving table 17 becomes unnecessary, and the setting work can be made more efficient.

It should be noted that the present invention is not limited to the above embodiment, but can be changed as appropriate. For example, RAM3
Are not limited to the contents shown in FIG. 6, but may be those shown in FIGS. 9 and 10. FIG.
Has the total descending amount from the origin as the descending amount of the knife holder of the data item "8". That is, in FIG. 9, the total descending amount is the descending amount specifying data. Further, as shown in FIG. 10 (a), as the descending amount of the knife holder, any one of the numbers 1 to 9 of the knife holder to be mounted may be selected instead of the descending amount itself. In this case, as shown in FIG. 10B, a table t1 in which the corrected descent amount is set in advance is stored in the RAM 3 for each of the usable knife receiving tables 1 to 9. Then, if the number “1” is selected as the knife receiving table number on the operation panel 5, the correction lowering amount set in the knife receiving table number 1 of the table t1 is adopted when the buttonhole is formed. That is, the table t1 is the descending amount data table of the present invention.

Although a RAM is used as a storage means for storing pattern data, an EEPROM (Electrically Erasable) is used.
An external storage medium such as a rasable programmable read only memory or a floppy disk may be used. The number of pattern data, the number of data items, the operation method on the operation panel, and the like can be appropriately changed. further,
In the above-described embodiment, a plurality of pattern data is stored, and one of them is selected to create the stitch data. However, the storage means may store a plurality of stitch data. Alternatively, a plurality of pattern data and stitch data corresponding to each pattern data may be stored. In that case, the configuration may be such that when the pattern data is selected, the stitch data is automatically specified. The shape of the button hole is not limited to the eyelet hole, but may be a sleeping hole or other shapes. In the present embodiment, the case where the knife receiving base is arranged above and the lowering drive is performed with respect to the cloth cutting knife arranged below has been described. May be arranged below and the cloth cutting knife may be driven downward.

[0037]

According to the first aspect of the present invention, the storage means stores a plurality of drilling control data including descent amount specifying data for specifying the descent amount of the knife holder or the cloth cutting knife. If one of them is selected by the control data selection means, the knife receiving table or the cloth cutting knife is driven based on the selected drilling control data under the control of the control means. Therefore, if the descent amount specifying data is set for each drilling control data, for each knife holder, or for the quality and thickness of the fabric, simply select the drilling control data and press the button. Along with changing the overall shape of the hole drilling stitch, the descending amount of the knife holder or cloth cutting knife is also set, eliminating the need for setting work only for setting the descending amount of the knife holder or cloth cutting knife. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a buttonhole sewing machine according to the present invention, showing an inside thereof.

FIG. 2 is a front view showing the buttonhole sewing machine of the present invention in a partially broken state.

FIG. 3 is a rear view showing the buttonhole sewing machine of the present invention in a partially broken state.

FIG. 4 is a top view showing the inside of the buttonhole sewing machine of the present invention.

FIG. 5 is a block diagram showing a control circuit of the buttonhole sewing machine according to the present invention.

FIG. 6 is a diagram showing an example of pattern data stored in a RAM.

FIG. 7 is a front view of the operation panel.

8A is a flowchart showing a general flow of buttonhole buttonhole sewing, FIG. 8B is a flowchart showing data setting processing, and FIG. 8C is a flowchart showing knife driving processing.

FIG. 9 is a diagram showing a second example of pattern data.

FIG. 10A shows a third example of pattern data, and FIG.
FIG. 8 is a diagram showing an example of a descending amount data table.

FIG. 11 is a diagram showing conventional pattern data.

12A is a diagram schematically showing a buttonhole shape for explaining each data item in pattern data, and FIG. 12B is a diagram showing a table for selecting an eyelet hole shape; Yes, (c) shows the eyelet shape for explanation of the table in (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU (control means) 2 ROM 3 RAM (storage means) 5 Operation panel (selection means, change means) 16 Start switch 17 Female cradle 18 Cloth cutting knife 21 Cloth cutting motor 100 Buttonhole sewing machine

Claims (5)

[Claims] 1. A driving means capable of electrically controlling a descending amount of one of a scalpel holder and a cloth cutting knife, and a plurality of buttonhole control data for forming a buttonhole and a buttonhole overlock seam. Storage means, control data selection means for selecting one of the plurality of overlock control data, and overlock stitches around the buttonhole based on the overlock control data selected by the control data selection means. And a control means for lowering a scalpel holder or a cloth cutting knife from a predetermined reference position to a cloth cutting position to form a buttonhole. The buttonhole control data includes a female holder. The control means includes the descent amount specifying data for specifying the descent amount of the table or the cloth cutting knife, and the control means includes the descent amount specifying data included in the selected holing control data. Buttonholing machine, characterized in that to drive the knife cradle or cloth cutting knife in descent amount corresponding to. 2. The descent amount specifying data includes correction data for correcting a descent amount serving as a reference. The control means controls a knife receiving table or a cloth cutting knife to determine the descent amount serving as a reference and the correction data. The buttonhole sewing machine according to claim 1, wherein the buttonhole sewing machine is driven based on the following. 3. The buttonhole buttonhole sewing machine according to claim 1, wherein the descending amount specifying data is a total descending amount of the knife receiving table or the cloth cutting knife. 4. A descent amount data table for storing a plurality of correction data for correcting a total descent amount or a reference descent amount of a scalpel holder or a cloth cutting knife. The buttonhole sewing machine according to claim 1, wherein the buttonhole sewing machine is data for specifying one of the data. 5. A buttonhole sewing machine according to claim 1, further comprising changing means for changing the content of the descending amount specifying data.