JP2000229185A - Buttonholing sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable fine changes in needle locations according to a type of sewing, or the like, and to obtain stitches with satisfactory appearance. SOLUTION: In this sewing machine, the stitches of buttonholing formed of right and left side sewing parts and upper and lower bar tacking sewing parts are formed. In this case, needle locations at the right and left end parts of the bar tacking parts are set by inputting distances to a reference line, which is the extension line of the needle locations of the outside end parts of both side sewing parts. The sewing machine is provided with both a first operating part provided with a data value input operating part 143 to input data values of various data items necessary for forming stitches and a second operating part 150 provided with a bar tacking width left key 152 and a bar tacking width right key 153 for the one-touch specification of bar tacking width left correction data and bar tacking width right correction data which is data on the distances, as the data items in which data values are inputted by the data value input operating part 143.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole overlock stitch having left and right side stitching portions and upper and lower bar-tacking stitch portions (bar-tacking portions) formed by electrical control, and to both-side stitching portions and both side stitching portions. The present invention relates to a buttonhole overlock sewing machine in which a buttonhole is formed between a bar-tacking portion and a cloth cutting knife.

[0002]

2. Description of the Related Art A buttonhole overlock sewing machine for performing buttonhole overlock sewing, which includes left and right side stitching portions and upper and lower bar-stitching portions so as to surround a buttonhole, is conventionally known. In such a buttonhole overlock sewing machine, the stitch shape and the like are determined by a mechanical configuration, and the base line position and the swing width are adjusted by the unevenness formed on the main cam and the adjusting screw.

[0003]

That is, the base line is adjusted only at two positions, that is, the base line positions of the left stitching portion and the right stitching portion. It was common to the two baseline positions. That is, it was not possible to adjust only the base line position of the right end of the bar-tacking portion. Further, the swing width can be adjusted only by two types of swing width common to the left and right side stitching portions and common to the upper and lower bar-stitching portions. For this reason, when adjusting the needle drop position (swing width side) on the left side of the bar-tacking portion, the swing width is changed from the base position of the right sewing portion.

By the way, the seams formed by the buttonhole overlock sewing machine include seams called whip stitching and pearl stitching. The whip stitching is almost at the center of the upper and lower cloths in both the side stitching portion and the bar-tacking stitching portion. Means the seam where the upper and lower threads are connected. What is pearl stitching?
A seam that is connected to the upper thread by raising the tension of the upper thread and pulling the lower thread onto the upper fabric. Normally, in pearl stitching, only the side stitches are sewn with the upper thread tension raised, so if the width of the bar-tacking stitch is set to the same value as the left and right width of the entire side stitching portion, the actual stitching of the side stitching Due to the high tension, the cloth is pulled to the center and looks thinner than the bar-tacking section. For this reason, the appearance sometimes deteriorated. In order to solve this problem, it is only necessary that the needle entry position such as the base line position and the swing width position of the seam can be freely changed for the bar-tacking portion or the side sewing portion. However, as described above, the conventional mechanical buttonhole In the sewing machine, the change of the needle drop position is considerably limited, and even if the change can be made, a driver or the like is required for the adjustment work, which is not easy.

[0005] On the other hand, conventionally, a general sewing machine which forms a desired seam by electric control has been known. Such a sewing machine includes an operation panel to which a plurality of types of data for determining a stitch can be input, and sewing is performed based on the plurality of types of data input by operating the operation panel.

An operation panel 200 of a conventional sewing machine is shown in FIG.
As shown in FIG. 2, a data value input operation unit (minus key 203, plus key 204) for inputting a data value, a data value display unit 202 such as a 7-segment display for displaying a data value, and a plurality of data items A data item selection operation section (down key 205,
An up key 206) and a data item display unit 201 such as a 7-segment display for displaying the selected data item are provided.

[0007] A serial number (data number) is assigned to the plurality of data items, and the data item display section indicates the selected data item by displaying the data number. In the operation panel 200 of such a conventional sewing machine, when it is desired to input a data value to a predetermined data item, first, the up key 2
06 and the down key 205 are appropriately operated to change the data numbers displayed on the data item display unit 201 one by one, so that the data number corresponding to the desired data item is displayed on the data item display unit 201, In this state, the data value can be input by the data value input operation unit.

However, in general, there are a plurality of types of data items that have a high change frequency and a low change frequency, and each time a data item with a high change frequency is selected, that is, every time the data item is displayed on the data item display section 201. In addition, the up key 206 and the down key 205 have to be operated many times, and the operability is very poor.

In the operation panel 200, since data items are represented by data numbers, when inputting data, the operator must confirm which data number represents which data item by referring to a manual or the like. Yes, the workability of data entry was poor. Further, since a data item is represented by a data number, an operation error such as inputting a desired data value to an incorrect data item is likely to occur. For this reason, after performing data input, it was necessary to perform trial sewing many times to check whether incorrect data input was performed.

[0010] The present invention has been made in view of the above-mentioned circumstances, and it is possible to delicately change the needle drop position in accordance with the sewing method or the like, and to obtain a seam with a good appearance.
An object of the present invention is to provide a buttonhole overlock sewing machine that allows data to be input with good operability and allows a user to easily select a predetermined data item without fail.

[0011]

According to a first aspect of the present invention, there is provided a button hole having left and right side stitch portions and upper and lower bar-tack stitch portions by electric control. In a buttonhole overlock sewing machine, a buttonhole is formed by a cloth cutting knife between both side stitching portions and both bartacking portions while forming overlock stitches. Needle entry data which can be input independently of the needle entry position of the both-side stitching section regardless of the needle entry position of the both-side stitching section, and the bar entry of the bar entry which is inputted by the bar entry section needle entry data input means. Control means for forming a bar-lock stitch portion of the buttonhole buttonhole stitch based on the position data, and in a position independent of the needle drop position of the both-side stitch portion, the left and right ends of the bar-lock stitch portion are provided. The fallen position was configured to be set.

According to the first aspect of the present invention, the needle drop positions at the left and right ends of at least one of the upper and lower bar-tacking portions can be set to positions independent of the needle drop positions of the both side stitch portions. The needle drop position can be delicately changed in accordance with the sewing method, etc., and even when sewing is performed with different tensions in the side stitching portion and the bar-tack stitching portion, an excellent-looking stitch can be formed.

According to a second aspect of the present invention, in the buttonhole overlock stitching machine according to the first aspect, the bar-tacking portion needle entry data input means uses an extension line of the needle entry position of the both-side stitching portion as a reference line. The needle drop positions at the left and right ends are set by inputting a distance from the reference line.

According to the second aspect of the present invention, the needle drop positions at both the left and right ends of the bar-tacking portion are determined by using the bar-tacking portion needle-drop data input means by using the extension line of the needle drop position of the both-side sewing portion as the reference line. Is set by inputting a distance to the reference line. By inputting a data value other than 0 as the value of the distance, the position can be changed to a position deviating from the reference line. The position of the needle drop can be delicately changed, and even when sewing is performed with different tensions in the side stitching portion and the bar-stitched stitching portion, a seam with a good appearance can be formed.

According to a third aspect of the present invention, in the buttonhole overlock sewing machine according to the second aspect, the reference line is
It is an extension of the needle drop position at the outer end of the left and right side stitches.

As described above, in the case of pearl stitching or the like, it is necessary to set the width of the bar-tacking stitch portion so as to look the same as the entire width of the both-side stitching portion. According to the method, since the outside of the left and right side stitch portions to be compared is directly used as a reference, the visibility can be easily set easily and accurately.

According to a fourth aspect of the present invention, there is provided a buttonhole overlock sewing machine according to any one of the first to third aspects,
The bar-tacking portion needle entry data input means includes first operation means for inputting a data value of a needle entry position at at least one of the left and right ends of the both bar-tacking stitch portions, and the buttonhole overlock stitch. A second operating means for designating the needle drop positions at both left and right ends from among various setting data items necessary for the above.

According to the fourth aspect of the present invention, needle drop positions at both left and right ends of the bar-tacking portion are designated by the second operating means, and data values of needle drop positions at both right and left ends by the first operating means. Since the input can be performed, the operability is remarkably improved as compared with the conventional process of operating and selecting the up key and the down key many times.

According to a fifth aspect of the present invention, in the buttonhole overlock stitching machine according to the fourth aspect, the bar-tacking portion needle drop position data designates a needle drop position at the left end of the bar-tacking portion. The second operation means specifies the bar-tacking width left correction data, which includes bar-tacking width left correction data and bar-tacking width right correction data for specifying the needle entry position at the right end of the bar-tacking sewing portion. A left correction data specifying operation unit and a right correction data specifying operation unit for specifying the bar tack width right correction data are provided.

According to the fifth aspect of the present invention, when inputting the needle entry position data of the bar-tacking portion, a left-correction-data specifying operation section for specifying the bar-tacking width left correction data, and a bar-tacking width right correction data. It is sufficient to operate the right correction data designation operation unit for designating the right and left sides, so that the operability can be improved and the left and right sides can be designated, so that the needle drop position can be more finely changed according to the sewing method or the like. I can do it.

According to a sixth aspect of the present invention, in the buttonhole overlock sewing machine according to the fifth aspect, the left correction data designation operation unit and the right correction data designation operation unit are both operated by one operation. The bar tack width left correction data and the bar tack width right correction data can be designated.

According to the sixth aspect of the present invention, by operating the left correction data designation operation unit and the right correction data designation operation unit once, the bar tacking width left correction data and the bar tacking width right correction data are changed. Since it can be specified, the operability is further improved.

According to a seventh aspect of the present invention, there is provided a buttonhole overlock sewing machine according to any one of the first to sixth aspects,
A stitch is formed for the upper and lower bar-tacking stitches based on the same bar-tack stitch needle drop position data.

According to the seventh aspect of the present invention, if one type of bar entry portion needle entry position data is input, the needle entry positions at the left and right ends of the upper and lower bar-tacking stitch portions can be set. Operation becomes easier.

[0025]

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

The buttonhole overlock sewing machine 1 of this embodiment is a sewing machine needle 9 for raising and lowering and swinging the needle to the left and right, a cloth presser 15 for holding a cloth (to be sewn), and a cloth held on the lower side. Cloth holding plate 1 that moves back and forth in the cloth feeding direction
4. Upper thread cutting scissors 80 for cutting the upper thread above the cloth presser 15, cloth cutting knife 1 for cutting the cloth to form a button hole
6, an operation panel 140 (FIG. 4) as setting input means for inputting each setting data and the like, and a control circuit 90 (FIG. 5) for controlling the buttonhole overlock sewing machine 1 and the like.

The cloth holder 15 and the cloth holding plate 14 are
The cloth is held during the sewing and is moved back and forth in the cloth feeding direction 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 forward and backward by driving a Y feed pulse motor 20 to move the cloth retainer 15 and the cloth holding plate 14 forward and backward.

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

The needle swing mechanism for swinging the sewing machine needle 9 right and left includes a main needle swing mechanism for swinging the sewing machine needle 9 at a predetermined swing width with a certain base line as an origin, a swing width changing mechanism for changing the needle swing width, and It comprises a base line changing mechanism for changing the base line in the left-right direction.

As shown in FIG. 3, the main needle swing mechanism includes a needle bar swing table 18, a needle swing arm 49, a connecting shaft 48, and a connecting lever 4.
7, needle swing cam lever 46, triangular cam 54, gear 51,
By transmitting the rotational movement of the upper shaft 6 of the sewing machine to the triangular cam 54, the needle swing cam lever 46 is swung with a predetermined swing width. The sewing needle 9 is rotated by rotating the pivot 18 around the fulcrum 18a.
Is swung right and left. The needle swinging operation of the main needle swinging mechanism is linked to the elevating movement of the sewing machine needle 9 via the upper shaft 6, the needle bar 8 is moved on the base line at the timing when the sewing machine needle 9 descends for the first time, and the second time. The needle bar 8 is moved from the base line to a position of a predetermined swing width at the timing when the needle bar 8 descends.

The swing width changing mechanism changes the swing width of the needle swing cam lever 46 through the links 55 and 56 by the rotation of the needle swing feed pulse motor 41 to thereby control the sewing needle 9.
Change the swing width of. The base line changing mechanism rotates the base line changing lever 43 about the fulcrum 43a by the rotation of the base line feed pulse motor 40, and moves the position of the fulcrum 44a which determines the origin of the swinging motion of the needle swing cam lever 46. By changing, the base line position of the swing of the sewing machine needle 9 is changed. In this sewing machine, the needle bar 8 is moved to the left (the front side in FIG. 3) with respect to the set base line by the set swing width.
Is to be shaken.

FIG. 4 is a diagram showing an operation panel 140 provided on the buttonhole overlock sewing machine 1 of the present embodiment.
The operation panel 140 is used to set and input various sewing parameters, display output of set values and display output of errors in sewing control. For example, a sewing machine on which the buttonhole buttonhole sewing machine 1 is mounted is provided. It is provided on a table. The operation panel 140 is roughly divided into an upper half first operation unit and a lower half second operation unit 150. The first operation unit includes a start operation unit 141, a data item operation unit 142, a data value input operation unit (first operation unit) 14
3. Mode switching operation section 144 and thread tension operation section 1
45 and the like are provided.

A preparation key 141A for inputting that the sewing preparation is completed is provided to the start operation section 141 by the operator.
And LED (Light Emitting Diod
e) and other display portions 141a. The data item operation unit 142 includes a data item display unit 142A, a down key 142B, and an up key 142C. The data item display section 142A displays, for example, a two-digit 7
It consists of a segment display and displays data items for inputting data values in data numbers and graphic displays. The down key 142B is a key for moving down the data number of the data item for inputting the data value by one, and the up key 142C is a key for moving up the data number by one. The types and contents of the data items will be described later in detail.

The data value input operation section 143 includes a data value display section 143A, a minus key 143B, and a plus key 1
43C is provided. The data value display section 143A
For example, a 4-digit 7-segment display is used to display the data value of each data item. The minus key 143B and the plus key 143C are keys for increasing or decreasing the data value by a predetermined unit value. As will be described later, a predetermined unit value and a settable range are determined for each data item. When the minus key 143B is pressed, the data value decreases by the unit value, and when the plus key 143C is pressed, the data value is reduced. It increases by the unit value. Even if the minus key 143B or the plus key 143C is pressed so that the data value does not exceed the settable range, the data value does not exceed the lower limit or the upper limit of the settable range.

The mode switching operation section 144 has a pattern number key 1 for switching to a pattern number setting mode.
44A and data key 1 for switching to data input mode
44B. In the buttonhole overlock stitching machine 1, a plurality of buttonhole overlock stitch shape patterns can be registered, and these multiple patterns are distinguished by the pattern numbers. Pattern number key 144A and data key 14
4B, indicators 144a, 1 such as LEDs are respectively provided.
44b is provided so that the operator can be informed of the pattern number setting mode or the data input mode by lighting them.

The thread tension operating section 145 is provided with a side sewing thread tension key 145A and a bar tacking thread tension key 145B, and a lower portion thereof indicates that the thread tension (thread tension) is set. Thread tension "is displayed. In the data input mode, the side sewing part thread tension key 145A
By pressing, the data item that can be input is once in the "thread tension data item on the side stitching area", and the data item that can be input by pressing the bar tension thread tension key 145B is once in the "thread tension data item on the bar sewing section". Can be switched by the operation of. On the side seam part thread tension key 145A, a schematic diagram of a button hole overlock stitch with the side stitch part highlighted is displayed, and on the bartacking thread tension key 145B, a button hole overlock stitch with a highlighted bar tack part. Are drawn respectively.

Further, these side sewing part thread tension keys 145A
LE bar tension control key 145B
D and other indicators 145a and 145b are provided, and a side-seam portion thread tension key 145A and a bar-tacking portion thread tension key 145 are provided.
When B is pressed, or when the data item selected in the data input mode is changed to “side sewing thread tension data item” or “bar tacking thread tension data item”, the display units 145a and 145a are respectively displayed. 145b is turned on so that the user can know which data item is selected.

The second operation unit 150 is an operation unit provided with a plurality of types of keys for switching data items that can be input with a single operation in the data input mode. The second operation section 150 is provided with a first display section 151 at the center, and an overall schematic diagram of buttonhole stitches is displayed (drawn) on the first display section 151. Also, the first display unit 1
51, a bar tacking width left key 152 serving as a left correction data designating operation unit and a bar tack width right key 153 serving as a right correction data designating operation unit constituting the second operation means, an overlock width key 154, and a parallel unit. Pitch key 155, clearance key 15
6, a cloth cutting length key 157, a knife groove width left key 158, and a knife groove width right key 159 are provided.

These bar tacking width left key 152, bar tacking width right key 153, overlock width key 154, parallel section pitch key 1
55, clearance key 156, cloth cutting length key 157, knife groove width left key 158, and knife groove width right key 159
The data items for which data can be input are "Bar tacking width left correction data item", "Bar tacking width right correction data item", "Overlock width data item", "Parallel section pitch data item", "Clearance data item", and "Cloth length". This key is used to switch between a data item, a "slot width left data item", and a "slot width right data item" in one operation.

These bar tacking width left key 152, bar tacking width right key 153, overlock width key 154, parallel portion pitch key 1
55, a clearance key 156, a cloth cutting length key 157, a knife groove width left key 158, and a knife groove width right key 159 have button hole overlock stitch portions corresponding to the respective lengths. A diagram and a diagram of an arrow indicating a corresponding portion are drawn. That is, the bartacking width left key 152
The partial view on the bar-tacking width right key 153 is a bar-tacking end display section. Also, below each of these keys, which part is shown, "Bar tacking width left", "Bar tacking width right", "Overlock width", "Pitch", "Clearance", "Cloth length", "Female groove width left" The letters "Scaling groove width right" are displayed. Also,
Corresponding lines L. connecting the respective parts of the overall schematic diagram of the first display unit 151 and the respective keys are drawn in order to indicate which part of each key is the length of the buttonhole stitch.

Further, these bar tacking width left key 152, bar tacking width right key 153, overlock width key 154, parallel section pitch key 155, clearance key 156, cloth cutting length key 15
7, knife groove width left key 158 and knife groove width right key 1
59 are indicators 152a to 159, such as LEDs, respectively.
a is provided, and the data items selected in the data input mode are “bar tack width left correction data item”, “bar tack width right correction data item”, “overlock width data item”, “parallel part pitch data item”, and “parallel portion pitch data item”. When the clearance data item, the cloth cutting length data item, the female groove width left data item, and the female groove width right data item are displayed, the indicators 152a to 159a of the corresponding keys are turned on, and which data item is displayed. Is selected.

FIG. 5 is a block diagram of a control circuit 90 of the overhole sewing machine 1 with a hole. As shown in FIG. 5, the control circuit 90 of the buttonhole overlock sewing machine 1
(Central Processing Unit
) 100, ROM (Read Only Memory)
y) 101, RAM (Random AccessMe)
memory 102, a Y-feed counter 103 for counting the rotation amount of each pulse motor, and a baseline feed counter 10
4. Y-feed pulse motor driver 111, baseline feed pulse motor driver 112, and needle feed pulse motor driver 113 for driving the pulse feed counter 105 and each pulse motor, and drivers and operations for various sensors and drive units. An I / O interface 109 for connecting the panel 140 or the like to the CPU 100; a sewing machine motor driver 115 for controlling the driving of the sewing machine motor 5; a sewing machine motor encoder 119 for coding the rotation amount of the sewing machine motor 5 as the rotation angle of the upper shaft 6; A press-up solenoid driving circuit 121 for driving a press-up solenoid 122 for raising the cloth presser 15, 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 interruption Conditions (each pal Counter value indicating the amount of rotation of the motor,
CPU 1 according to the cloth feeding position, the rotation angle of the upper shaft 6, etc.
Interrupt controller 1 that outputs an interrupt signal at 00
08 etc.

The sewing machine motor driver 115 has a needle position sensor 116 for detecting that the sewing machine needle 9 is at the upper position, a feed position for detecting the reference positions of the cloth holder 15 and the cloth holding plate 14 in addition to the sewing motor 5. Reference position sensor 11
7. A TG (tach generator) generator 118 for detecting the rotation angle of the upper shaft 6 is connected. The I / O interface 109 includes an operation panel 140, a driver and a driving circuit of each driving unit, a presser switch 124 for instructing the cloth presser 15 to move up and down, and a start switch for instructing the sewing machine motor 5 to start driving. 125 and the like are connected.

The CPU 100 uses the predetermined area of the RAM 102 as a work area and according to a control program stored in the ROM 101, data from the operation panel 140,
Based on the detection signals from the various sensors connected, various driving units are controlled via the respective drivers.
The ROM 101 calculates an input pattern from the operation panel 140 and calculates a sewing pattern (all needle drop positions from the start to the end of sewing) of a buttonhole based on various sewing data input via the operation panel 140. The control program includes a pattern calculation process to be performed, a sewing process for performing a sewing operation in accordance with the calculated sewing pattern, and the like. The RAM 102 has, in addition to the work area of the CPU 100, storage means for storing various sewing data of the buttonhole stitches input via the operation panel 140.

Here, the types and contents of the sewing data which can be input from the operation panel 140 and determine the sewing pattern of the buttonhole sewing will be described. FIG. 6 is a chart diagram of a data table showing data items that can be input from the operation panel, and FIG. 7 explains which part of the buttonhole overlock sewing each data item in FIG. 6 represents. FIG. In FIG. 7, a data item name and a data number are described in each part of the buttonhole overlock stitch u0.

With respect to the length of each part of the buttonhole overlock stitch u0 (FIG. 7), data items that can be input from the operation panel 140 are as shown in the data table of FIG. That is, cloth cutting length data (the length of the button hole groove u1), which is the button hole length data, and the female groove width right data (the button hole groove u
1, the distance between the left edge of the right sewn section u2), the knife groove width left data (the distance between the button hole groove u1 and the right end of the left sewn section u2), the overlock width data (the left and right width of the side sewn section u2), Stopping length data (vertical length of bar-tacking unit u3), clearance data (distance between the lower end of upper bar-tacking unit u3 and the upper end of button hole groove u1) and second clearance data (lower bar-tacking unit) Distance between the upper end of the section u3 and the lower end of the button hole groove u1, parallel section pitch data (vertical distance between the two stitches of the side stitching section u2), and bar tacking section pitch data (between the two stitches of the bar tacking section u3) In the vertical direction), bar-tacking width right correction data as right correction data (the right end of the bar-tacking portion u3 and the right-side sewing portion u2)
, Left correction data as a left correction data (the length of the deviation between the left end of the bar tacking portion u3 and the left end of the left sewing portion u2), and data on thread tension. Left stitch thread tension data (thread tension when sewing the left stitch u2), right stitch thread tension data (right stitch u2)
Of the first bar-tacking section (thread tension at the time of sewing of the upper bar-tacking section u3), and the second bar-tacking section thread tension data (thread tension at the time of sewing of the lower bar-tacking section u3). ), And 1
/ Double data (the number of times of double stitching of the side stitching section u2), maximum speed limit data (maximum limit of the number of rotations of the sewing machine), and the like.

As described above, in the buttonhole overlock stitching machine 1, the positions of the needle drop at the left and right ends of the upper and lower bar tacking portions u3 are the needle drop at the left end of the left stitch portion u2 and the right end of the right stitch portion u2. An extension of the position is set as a reference line. Then, for each of the left end and the right end, a distance in the left-right direction from the reference line can be set,
As this distance, bar tack width right correction data and bar tack width left correction data are input. That is, if the bar tack width right correction data and the bar tack width left correction data are set to 0, the needle drop positions at the left and right ends of the upper and lower bar tack portions u3 are extended from the outer ends of the left and right side stitch portions u2. On the line.
However, when a value other than 0 is input, the needle drop position at the end of the bar-tacking portion u3 is shifted from the extension of the side stitching portion.

As shown in the data table of FIG. 6, a data number (“N” in FIG. 6) corresponding to each of the above data items is a serial number of the data item.
o "), a setting range indicating the upper and lower limits of the settable data value, a minus key 143B and a plus key 143.
A unit value of data that can be increased or decreased by one operation of C, a standard data value, and the like are stored in the ROM 101. In addition, a plurality of standard data value sets can be registered for each button overhole sewing shape pattern, and these are identified by a pattern number (indicated by "pattern No." in FIG. 6).

Next, a method for setting sewing data using the operation panel 140 of the buttonhole overlock sewing machine 1 having the above-described configuration will be described. First, before inputting the sewing data, a pattern number for registering the sewing data is selected. To select a pattern number, the pattern number key 144A is turned on to switch to a pattern number setting mode. By this switching, the indicator 144a of the pattern number key 144A lights up, and it can be recognized that the setting mode has been set. Next, the down key 142
B and the up key 142C are operated to display the data item display section 1.
The pattern number displayed on 42A is changed to a desired value.

After the pattern number is set, the data key 144B is turned on to switch to the data input mode. By this switching, the pattern number key 144A
Indicator 144a goes out and the data key 144B
Is turned on, and it can be recognized that the setting mode has been set. When the mode is changed to the data input mode, a data item to be input next is selected. The selection of the data item is performed by a method using only the data item operation unit 142 and the second operation unit 150 or the thread tension operation unit 14 which is a feature of the present invention.
5 method.

First, a selection method by operating the data item operation unit 142 will be described. In this method, up key 1
By operating the 42C and the down key 142B, the data number displayed on the data item display section 142A is changed by "1". When the data number of the data item to be input is displayed, the selection is completed. In the process of changing the selected data item by operating the up key 142C and the down key 142B, the selected data item is changed to the data corresponding to each key of the thread tension operation unit 145 or each key of the second operation unit 150. When the item is reached, the indicators 145a and 145 on the corresponding key
b, 152a to 159a are turned on, while non-applicable indicators 145a, 145b, 152a to 159a are turned off. The operator operates the data numbers and indicators 145a and 145b displayed on the data item display section 142A.
It is also possible to recognize what data item is selected by turning on / off 152a to 159a.

Next, the thread tension operation unit 145 and the second operation unit 1
A selection method using 50 will be described. In this method, the key corresponding to the data item to be selected (the bartacking width left key 15
2. Bartacking width right key 153, overlock width key 154, parallel section pitch key 155, clearance key 156, cloth cutting length key 157, knife groove width left key 158, knife groove width right key 15
9, among the side stitching part thread tension key 145A and the bar-tacking part thread tension key 145B), the selection is completed only by turning on the corresponding key. That is, by turning on the key corresponding to the data item to be selected, the data number displayed on the data item display section 142A is changed to the data item number corresponding to the key operation. Furthermore,
The indicator provided on the key is turned on, and the indicators on the other keys are turned off.

When a data item for data input is selected, a standard data value previously input to the data item is displayed on the data value display section 143A. In this state, by operating the minus key 143B and the plus key 143C, the data value is updated by the unit value shown in the data table of FIG. 6 and if the data value is changed to a desired data value, the data value input is completed. is there. This change is immediately reflected as a setting data value, and is stored in a predetermined storage area in the RAM 102.

As described above, once the data values have been input,
Further, the processing from the selection of the data item to the input of the data value is repeated. When inputting data values of a plurality of shape patterns, selection of a pattern number, selection of a data item, and input of a data value are repeated.

When the input setting of the data value is completed, the ready key 141A is turned on, the needle drop position is calculated from the set sewing data, and the start switch 125 (FIG. 5) is operated. The cloth feed mechanism and the needle swing mechanism are controlled so that the needle falls to the needle drop position, and the buttonhole stitch is sewn in a desired sewing pattern. Further, the cloth cutting knife 16 is dropped during the sewing to form a button hole groove having the set cloth cutting length.

Hereinafter, the processing procedure of the buttonhole buttonhole sewing process in the buttonhole buttonhole sewing machine 1 will be described in detail. FIG. 8 shows a control circuit 9 of the buttonhole overlock sewing machine 1.
It is a flowchart which shows the processing procedure of the general flow of the buttonhole overlocking processing performed by 0. The buttonhole buttonhole sewing process is started, for example, when the power of the buttonhole buttonhole sewing machine 1 is turned on. When the power is turned on to the buttonhole overlock sewing machine 1, 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 ready key 141A of the operation panel 140 is on. If the operation is on, the process proceeds to step S3. If the operation is off, the process returns to step S1 and the operation panel setting process is performed. repeat. When the preparation key 141A is pressed and the process proceeds to step S3,
Based on the sewing data set in the step S1, the needle drop position of the sewing pattern is calculated, and a step S1 is performed.
Move to 4. In step S4, it is determined whether the preparation key 141A has been turned on. If the preparation key 141A is on, the process returns to step S1. If the preparation key 141A is off, the process proceeds to step S5.

At step S5, the sewing work is set on the sewing machine table 2 by the operator.
The process proceeds to 6 to determine whether or not the start switch 125 (FIG. 5) has been turned on. And the start switch 12
If 5 is not on, the process from step S4 is repeated, and if on, the process proceeds to step S7. In step S7, the sewing machine motor 5, the Y feed pulse motor 20, the baseline feed pulse motor 40 and the needle swing feed pulse motor 41 are driven according to the sewing pattern created in step S3 to start one buttonhole stitching stitch. The sewing process from the start to the end and the driving of the cloth cutting knife 16 are performed, and after the sewing process is completed, the process returns to the step S4. That is, once the setting of the sewing data is completed, the sewing process is repeated by repeatedly turning on the start switch 125. If the user wants to return to the setting of the sewing data, the user can return to the operation panel setting process of step S1 by turning on the preparation key 141A again.

In the general flow shown in FIG. 8, the sewing pattern calculation processing in step S3 is performed by dividing the processing into a sewing start position, a left sewing section, an upper bar-tacking section, a right sewing section, a lower bar-tacking section, and a sewing end section. The needle drop position is obtained for each part, and a specific calculation method is not particularly limited, and a known method can be used. However, it is a feature of the present invention that the end of the upper and lower bar-tacking portions is set as an extension line of the end of the side stitching portion as a reference line. The processing will be described in detail below.

The sewing of the upper bar-tacking portion u3 (FIG. 7) is performed as shown in FIG.
After sewing the left sewing part u2 in the direction shown by the arrow in (a),
So as to be continuous to this, start sewing from P _1. And
Sewing procedure above bar tacking portion u3 is shown in FIG. 9 (a), P ₁
A first half leading to to P _5, is divided into the second half of up to P ₅ to P ₉ as shown in also (b). In FIG. 7, P _{2 to} P ₅
Seam up, because the seam is hidden overlap by sewing up P ₅ to P _9, is omitted. FIG. 10 is a flowchart showing a processing procedure for obtaining the sewing pattern of the upper bar-tacking unit u3 in the sewing pattern calculation processing performed in step S3 of the general flow (FIG. 8). During the flow, Y
(Y ') is the length of Y feed, N (N') is the number of repetitions of needle entry (number of stitches), and K (K ') is 1 of the needle entry position on the base line side.
The amount of movement for each needle, H (H '), is one of the needle drop positions on the swing width side.
The movement amount for each needle, T (T '), indicates the thread tension value. Y, N, K, H, T is the value of time P1~P5 sewing, Y ', N', K ', H', T ' is the value at the time of P ₅ to P ₉ sewing. A, b, c, d, f, g, and h are shown in FIG.
Are used as temporary data values for the knife groove width left, knife groove width right, bar tack length, overlock width, bar tack portion pitch, bar tack width left correction, and bar tack width right correction.

First, in a step S90, Y = f is set, then in a next step S91, N = c ÷ f is calculated, and then in a next step S92, K = (a + b + d
+ H) ÷ N is calculated, and subsequently, in the next step S93,
H = (a + b + d + h + g) ÷ N is calculated. continue,
In the next step S94, T = “bar tacking portion tension” is set, then in the next step S95, Y ′ = f is set, and in the next step S96, N ′ = c ÷ f is set. Calculate. Then, in the next step S97, K ′ = 0 is set, subsequently, in the next step S98, H ′ = 0 is set, and then, in the next step S99, T ′ = “bar tacking portion tension” Is set, the process proceeds to step S4 in the flow of FIG.

As described above, the P of the upper bar-tacking portion u3₁From
P_FiveIn steps S92 and S93, K
The position of the baseline and the swing width are moving as
Good. P ₁To P_FiveThe needle drop position in the first half of the
The principle at that time will be described with reference to FIG. In addition,
In FIG. 11, the bar tacking width left correction data value g, the bar tacking width
The right correction data values h are all 0. In the figure, H0
Is the overlock width of the left seam. First, as mentioned above
In addition, the needle swing mechanism allows the needle 9 to swing in the basic direction.
It is set to swing to the left of the line. Therefore,
When the needle 9 is dropped to two places on the left and right, a base line changing mechanism
Is always the right needle entry position.
Set by the main swing mechanism with reference to the baseline.
The position swung to the left by the specified amount
Position. That is, in FIG. 11, the needle drop point on the right side
P₁Is located on the baseline, and the next left needle drop point P_TwoIs the base
As long as the line does not change, it is determined by the main swing mechanism.
Needle drop point P by the amount of needle swing₁Located to the left of
Will be. Needle entry point P_TwoIn, as shown in the figure,
The baseline moves to the right by K and₁Needle entry point because it moves on the line
P_TwoThe swing amount up to is H0 + H. And on the left
Needle drop point P of_TwoFrom next needle drop point P_ThreeWhen
The position is determined by the setting of the baseline. That is, the needle drop point P
_TwoIs shifted to the right by K from the baseline of
The baseline position itself moved by only the needle drop point P_ThreeBecomes
Similarly, the needle drop point P on the right side_ThreeNext needle drop from left
Point P_Four, The baseline is k_TwoBecause it moves on the line,
The amount of these swings is H0 + H + H + H. In addition, left
Needle drop point P on the side_FourFrom next needle drop point P_FiveWhen
Means that the baseline has moved by K, and the moved baseline position itself
Is the needle drop point. According to the above principle, P₁~
P_FiveThe needle drop position is determined.

The needle drop position of the lower bar-tacking unit u3 is also obtained by the same procedure as the above-described operation of the upper bar-tacking unit.

As described above, according to the buttonhole overlock sewing machine 1 of this embodiment, the needle drop positions at the left end and the right end of the upper and lower bar-tacking portions u3 are set at the left end and the right end of the left sewing portion u2. An extension line at the right end of the sewing portion u2 is set as a reference line. By inputting a data value other than 0 as the bar tacking width right correction data and the bar tacking width left correction data,
The needle drop position at the right end of the bar-tacking part, which could not be done before, can be corrected, and it can be changed from the reference line to the left and right, so the needle drop position can be slightly shifted according to the sewing method, etc. Even when sewing is performed with different tensions between the side stitching portion and the bar-tacking portion, an excellent stitch can be obtained.

When data is input, the bar tacking width left key 152 or the bar tacking width right key 153 can be operated with one touch to display the bar tacking width left correction data item or the bar tacking width right correction data item. Since the selection is made immediately, the operability is significantly improved as compared with the conventional process of operating and selecting the up key 142C and the down key 142B many times,
Easy and error-free data entry. Therefore, there is no need to perform trial sewing to check for data input errors. Further, by inputting one set of correction data values, the needle drop positions at the left and right ends of the upper and lower bar-tacking portions can be set, and the operation by the operator is simplified.

Further, while an overall schematic diagram of the buttonhole overlock stitch is drawn in the center of the second operation section 150 (the first display section 151), the left end of the bartacking section is shown on the bartacking width left key 152. Since the partial drawing shows the right end of the bar-tacking portion on the bar-tacking width left key 152, the data item specified by the bar-tacking width left key 152 is the bar-tacking width left correction data. It is possible to intuitively and easily indicate that the item is an item and that the data item specified by the bartacking width right key 153 is a bartacking width right correction data item. It is possible to prevent mistakes such as inputting to the user beforehand.

The graphic display of the bar-tack width left key 152 and the bar-tack width right key 153 is displayed by linking the entire shape of the buttonhole overlock stitch displayed on the first display unit 151 with a corresponding line L. Since the bar-tacking portion width left correction and the bar-tacking portion width right correction are related to which part of the buttonhole buttonhole stitch, it can be recognized without fail. In the end,
This improves the operability of data input and reduces data input errors, thereby eliminating the need for trial sewing.

The present invention is not limited to the buttonhole overlock sewing machine of this embodiment. For example, in the above-described embodiment, the outside of the side stitching portion is used as the reference line for correcting the end portion of the bar-tacking portion. In addition, the data value input operation unit for inputting data values may be of a type in which a numerical value is directly input by a numeric keypad in addition to an input by changing each unit value by a plus key and a minus key, or a data value may be input. Any form is possible if possible. Also,
In this embodiment, a partial view on the bar tacking width left key 152 and a partial view on the bar tacking width right key 153 are illustrated as the bar tacking width end display section. May be provided, or a display unit (for example, a partial view) may be provided at a position distant from the key and connected to the key by a corresponding line. In addition, the specific configuration and processing method shown in this embodiment, such as other keys of the operation panel 140, the operation method of these keys, and the processing contents, can be appropriately changed without departing from the gist of the invention. is there.

[0069]

According to the first aspect of the present invention, the needle drop positions of the left and right ends of at least one of the upper and lower bar-tacking portions are set to positions independent of the needle drop positions of the both-side sewing portions. it can. Therefore, including the needle drop position on the base line side (right side) of the bar-tacking part, which could not be realized with the conventional technology,
The needle drop position at both ends of the bar-tacking section can be set freely, and the needle-drop position can be delicately changed according to the sewing method.The side sewing section and the bar-tacking section have different tensions. Even in the case of sewing, a seam with good appearance can be formed.

According to the second aspect of the present invention, the needle drop positions at both the left and right ends of the bar-tacking portion are determined by the bar-tacking portion needle drop data input means by using the extension line of the needle drop position of the both-side sewing portion as the reference line. Is set by inputting a distance to the reference line. By inputting a data value other than 0 as the value of the distance, the position can be changed to a position deviating from the reference line. The position of the needle drop can be delicately changed, and even when sewing is performed with different tensions in the side stitching portion and the bar-stitched stitching portion, a seam with a good appearance can be formed.

In the case of pearl stitching or the like, it is necessary to set the width of the bar-tacking portion so as to look the same as the entire width of the both-side stitching portion. Since the outside of the left and right side stitching portions as targets is directly used as a reference, visibility is good and accurate setting can be easily performed.

According to the invention set forth in claim 4, according to claim 1
In addition to the effects of the inventions described in (1) to (3), the needle operating positions at the left and right ends of the bar-tacking portion are designated by the second operating means, and the data values of the needle operating positions at the left and right ends are input by the first operating means. Therefore, the operability is remarkably improved as compared with the conventional process of selecting and operating the up key and the down key many times.

According to the invention set forth in claim 5, according to claim 4,
In addition to the effects of the invention described in the above, when inputting the needle entry position data of the bar-tacking section, a left-correction data specifying operation section for specifying the bar-tacking width left correction data, and a right for specifying the bar-tacking width right correction data. Since it is only necessary to operate the correction data designation operation unit, the operability can be improved and the left and right sides can be designated, so that the needle drop position can be more finely changed according to the sewing method or the like.

According to the invention of claim 6, according to claim 5,
In addition to the effects of the invention described in the above, by operating the left correction data designating operation unit and the right correction data designating operation unit once, the bartacking width left correction data and the bartacking width right correction data can be designated. Operability is further improved.

According to the invention of claim 7, according to claim 1,
In addition to the effects of the inventions described in 1 to 6, if one type of bar entry portion needle entry position data is input, the needle entry positions at the left and right ends of the upper and lower bar-tacking stitch portions can be set. It will be easier.

[Brief description of the drawings]

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

FIG. 2 is a perspective view mainly showing a cloth feed and a needle elevating mechanism of the buttonhole overlock stitch sewing machine.

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

FIG. 4 is a diagram showing an operation panel provided in the buttonhole overlock sewing machine according to the embodiment.

FIG. 5 is a block diagram showing a circuit configuration of the buttonhole overlock sewing machine.

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

7 is a diagram for explaining the correspondence between each data item in FIG. 6 and each part of buttonhole overlock stitching.

FIG. 8 is a flowchart showing a general procedure of a buttonhole buttonhole sewing process performed by a control circuit of the buttonhole buttonhole sewing machine.

FIG. 9 is a diagram showing a sewing order of an upper bar-tacking portion.

FIG. 10 is a flowchart showing a processing procedure of a subroutine for obtaining a sewing pattern of the upper bar-tacking portion.

FIG. 11 is a diagram for explaining the principle of arithmetic processing of the upper bar-tacking unit.

FIG. 12 is a view showing an operation panel provided in a conventional general sewing machine.

[Explanation of symbols]

Reference Signs List 1 Buttonhole overlock sewing machine 5 Sewing machine motor 9 needle 15 Cloth presser 16 Cloth cutting knife 20 Y feed pulse motor 40 Base line feed pulse motor 41 Needle swing feed pulse motor 80 Thread cutting scissors 140 Operation panel 141 Start operation section 142 Data item operation section 142A Data item display section 142B Down key 142C Up key 143 Data value input operation section 143A Data value display section 143B Minus key 143C Plus key 144 Mode switching operation section 144A Pattern number key 144B Data key 145 Thread tension operation section 145A Side sewing thread Tension key 145B Bar-tacking part thread tension key 150 Second operation part (second operation means) 151 First display part 152 Bar-tacking width left key (Left correction data specification operation part) 153 Bar-tacking width right key (Right correction data specification Operation section) 154 Overlock width key 155 Parallel section pitch key 156 Clearance key 157 Cloth cutting length key 158 Female groove width left key 159 Female groove width right key 144a, 144b, 145a, 145b, 152a-
159a Display L, L ... Corresponding line u0 Buttonhole overlock stitch u1 Buttonhole groove u2, u2 Side stitching part u3, u3 Bartacking part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B150 AA02 AA24 CB03 CB14 CE04 CE09 CE23 DB03 EB02 GF02 GF03 GG02 GG10 JA07 LA05 LA07 LA16 LA34 LA51 LA59 LA60 LA64 LA65 LB02 NA05 NA07 NA15 NA27 NA47 NA55 NA56 NA57 NA63 NB02 NB03 NB15 NB16 NB18 NC02 NC06 QA00 QA01 QA06 QA07 QA08

Claims (7)

[Claims] 1. A buttonhole overlock stitch comprising left and right side stitch portions and upper and lower bar tack stitch portions is formed by electrical control, and a cloth cutting knife is provided between both side stitch portions and both bar tack stitch portions. In a buttonhole overlock stitching machine forming a buttonhole, the needle drop positions at both left and right ends of at least one of the both bar tack stitch portions can be input independently regardless of the needle drop positions of the both side stitch portions. Stopper needle drop data input means, and control means for forming a barlock stitch portion of a buttonhole overlock stitch based on the bar tack portion needle drop position data input by the bar tack portion needle drop data input means, In a position independent of the needle drop position of the both-side stitching part,
A buttonhole overlock sewing machine characterized in that the needle drop positions at both left and right ends of the bar-tacking section can be set. 2. The bar entry part needle drop data input means,
Using the extension line of the needle drop position of the both-side stitching portion as a reference line,
2. The buttonhole overlock sewing machine according to claim 1, wherein the needle drop positions at the left and right end portions are set by inputting a distance to the reference line. 3. The buttonhole overlock sewing machine according to claim 2, wherein the reference line is an extension line of a needle drop position at an outer end portion of the left and right side stitching portions. 4. The bar-tacking portion needle entry data input means,
A first operating means for inputting data values of needle drop positions at at least one of left and right ends of the both bar-tacking stitch portions; and various setting data items necessary for forming the buttonhole overlock stitch. The buttonhole overlock sewing machine according to any one of claims 1 to 3, further comprising second operation means for designating the needle drop positions at the left and right ends. 5. The bar-tacking portion needle drop position data includes bar-tacking width left correction data for specifying a needle drop position at a left end portion of the bar-tacking portion, and a needle drop position at a right end portion of the bar-tacking portion. The second operation means includes a left correction data specifying operation unit for specifying the bar tack width left correction data, and a right correction data for specifying the bar tack width right correction data. The buttonhole overlock sewing machine according to claim 4, comprising a data designation operation unit. 6. The bar correction data specifying operation section and the right correction data specifying operation section can specify the bar tack width left correction data and the bar tack width right correction data by a single operation. The buttonhole overlock sewing machine according to claim 5, characterized in that: 7. The buttonhole overlock sewing machine according to claim 1, wherein a seam is formed for the upper and lower bar-tacking portions based on the same bar-tacking portion needle drop position data.