JPH04261695A - Eyelet stitching machine - Google Patents

Abstract

PURPOSE:To provide an eyelet darning machine which can carry out an eyelet stitching on a periphery of an eyelet part in a stitch form desired by a user by changing a needle position to a desired one, and the changing of the needle position is easy. CONSTITUTION:When a reference stitch data of an eyelet stitching is read out of an outside memory 38 (S2) and an eyelet form and a needle position are displayed in an enlarged size on a display screen (S4 and S5) and further a position is indicated, the indicated position winks (S9). After this, if the winking point is moved to change the needle position for setting anew, the stitch data is corrected. Based on the corrected stitch data, a feeding mechanism of a feeding stand and a looper base and needle rod rotating mechanism are controlled to carry out a desired form of eyelet stitching.

Description

[Detailed description of the invention]

0001

0001

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet overlock sewing machine that radially overlocks a workpiece cloth set on a feed table around an eyelet-shaped hole formed in the workpiece cloth.

0003

0002

0004

2. Description of the Related Art In recent years, as shown in FIG. 7, a hole 2 (hereinafter referred to as an eyelet hole 2) consisting of an eyelet portion 2a formed in a work cloth 1 and a straight hole portion 2b continuous thereto, has been For example, as shown by arrows A, B, and C, the right side of the straight hole portion 2b,
An eyelet overlock sewing machine has been provided which automatically performs a series of overlock stitches 3 around the eyelet part 2a and on the left side of the straight hole part 2b in this order.

[0005]

As shown in FIG. 6, such an eyelet sewing machine has an arm section 6 integrally provided with a needle bar 8 having a sewing needle 7 above the bed section 5.
A looper base 17, which is provided with a looper (not shown), is provided therein, facing the needle bar 8. The needle bar 8 and the looper are driven synchronously by a drive mechanism such as a sewing machine motor, and at this time, the needle bar 8
is adapted to swing left and right with a predetermined needle swing width L. On the other hand, on the upper surface of the bed section 5, there is a feed base 25 that is fed and moved in the X-axis and Y-axis directions (see FIG. 7) by a feed mechanism consisting of two pulse motors for the X-axis and Y-axis. The work cloth 1 is set on this feed table 25 with its back side facing up.

[0006]

[0004] With this, the needle bar 8 is driven up and down while swinging by the drive mechanism, and the looper is driven in synchronization therewith, while the feed mechanism moves the feed base 25 up and down the needle bar 8.
When the sewing machine moves upward, it is moved by a predetermined feed amount and the overlock stitch 3 is applied to the workpiece cloth 1. At this time, when sewing the semicircular part of the upper half of the eyelet 2a, the looper base 17 and the needle bar 8 are moved by a rotation mechanism 21 consisting of a θ-axis pulse motor 19 and a gear mechanism 20 when viewed from the top. are integrally rotated counterclockwise by a predetermined angle, so that stitches are formed radially around the eyelet portion 2a.

[0007]

The drive mechanism (sewing machine motor), the feed mechanism (two pulse motors), and the θ-axis pulse motor 1
9 operates based on the stitch data stored in the memory in advance according to the shape of the eyelet 2 (the size of the eyelet 2a and the length of the straight hole 2b) by a control device consisting of a CPU, memory, etc. It's about to be controlled. This stitch data includes the amount of feed in the X-axis direction of the feed base 25 for each stitch, the amount of feed in the Y-axis direction, and the rotation angle θ of the looper base 17 and needle bar 8.
The control device sequentially reads out the stitch data one unit at a time and controls the energization of the feed mechanism (pulse motor) and the θ-axis pulse motor 19.

[0008]

Therefore, in this case, the rotation angle θ and the feed amount in the X-axis direction are always 0 on the left and right portions of the straight hole portion 2b.
Then, the feed table 25 is fed a constant amount a in the Y-axis direction every other stitch.
The stitch data is set so that only the stitches are fed. and,
When sewing the lower half of the eyelet section 2a, the stitch data is set so that the feed bar 25 is fed by a predetermined amount in the X-axis direction and the Y-axis direction for each stitch. When sewing the semicircular part of the
is fed by a predetermined feed amount in the X-axis direction and Y-axis direction, and the looper base 17 and needle bar 8 are rotated counterclockwise every other stitch by a predetermined rotation angle θ based on the inner needle drop point. The stitch data is set to move.

[0009]

[0007]

0010

However, in the conventional eyelet sewing machine described above, the stitch data is fixed for each shape of the eyelet 2, and only one type of stitch can be formed. On the other hand, in recent years, for example, processed cloth 1
The shape of the seam around the eyelet part 2a may be changed due to circumstances such as the desirability of seams of different shapes depending on the material and type of the eyelet, and the diversification of user preferences regarding the appearance of the seam. There is a growing demand for something that can do this.

[0011]

[0008] Therefore, in recent years, devices have been developed in which the user can select the number of stitches around the eyelet portion 2a. With this, one piece of stitch data is prepared for each number of stitches and stored in the memory.
When the user specifies the desired number of stitches by operating a switch on the operation panel, the stitch data corresponding to the specified number of stitches is read out from among the multiple stitch data and the sewing operation is executed. It has become.

0012

[0009] This makes it possible to change only the number of stitches (stitch density) around the eyelet 2a according to the user's wishes. However, since the sewing work is still performed using one type of fixed stitch data for each number of stitches, it is possible for the user to freely change the specific shape of the stitches, for example, to whatever he or she desires. was impossible.

[0013]

The present invention has been made in view of the above circumstances, and its object is to provide an eyelet overlock sewing machine that allows the user to perform overlock stitches around the eyelet in a desired stitch shape. be.

[0014]

[0011]

[0015]

[Means for Solving the Problem] In the eyelet sewing machine of the present invention, the needle bar and the looper are synchronized so as to repeat a seam forming operation in which a sewing needle and the looper cooperate to form a seam on a workpiece cloth. A drive mechanism to drive, a feed mechanism to feed and move the feed base when the needle bar is raised, a rotation mechanism to rotate the looper base on which the looper is provided and the needle bar, and an amount of feed of the feed base for each stitch. A storage means for storing stitch data specifying the rotation angle of the needle bar and the looper base, and a control device for controlling the drive mechanism, the feeding mechanism, and the rotation mechanism based on the stitch data stored in the storage means. a display device for enlarging and displaying on a display screen the shape of the eyelet-shaped hole and the needle drop position around the hole based on the stitch data; and an input means for instructing the needle drop position on the display screen. , and a stitch data creation means for creating stitch data based on the needle drop position inputted by the input means.

[0016]

0012

[0017]

[Operation] According to the above means, the control device controls the drive mechanism, the feed mechanism, and the rotation mechanism based on the stitch data specifying the feed amount of the feed base for each stitch and the rotation angle of the needle bar and looper base. is controlled, and in this way, overlock stitches are applied radially around the eyelet-shaped hole. When performing this overlock stitch, the user can specify a desired needle drop position using the input means. Then, when there is an input from this input means, the stitch data creation means creates stitch data so that the specified needle drop position can be obtained. Therefore, overlock stitching can be performed at a needle drop position according to the user's wishes.

[0018]

Further, in this case, the shape of the eyelet-shaped hole and the needle drop position around the hole according to the stitch data are displayed in an enlarged manner on the display screen of the display device, and furthermore, the indication of the needle drop position is displayed on the screen of the display device. Since this can be done on the screen, it is easy for the user to intuitively understand the shape of the stitches, and the user can easily perform the task of indicating the needle drop position.

[0019]

[0014]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, to briefly describe the overall configuration of the eyelet sewing machine based on FIGS. 3 and 6, the sewing machine main body 4 has a bed section 5 having a substantially rectangular box shape, and extends continuously from the upper part of the back section forward. It is configured to integrally include an arm portion 6. A needle bar 8 equipped with a sewing needle 7 is provided at the lower end of the arm portion 6.

[0021]

The sewing machine main body 4 is placed on a sewing machine table 9, and as shown in FIG. An operation panel 11 as described below,
A foot-operated start/stop switch 12 and the like are provided, and a CPU that controls the operation of each mechanism, which will also be described later, is provided.
13, a control device 16 consisting of ROM 14, RAM 15, etc.
is provided.

[0022]

Although not shown in detail, the needle bar 8 provided on the arm portion 6 receives the rotational force of a main shaft 18 rotated by the sewing machine motor 10 through a cam mechanism, and rotates left and right at a predetermined width L. It is designed to be driven up and down while swinging. Further, a looper base 17 having two loopers (not shown) is provided in the bed section 5 so as to face the needle bar 8, and the rotation of the main shaft 18 is also applied to the loopers via a cam mechanism (not shown). The looper is driven in synchronization with the vertical movement of the needle bar 8. In this way, the sewing machine motor 10, the main shaft 18, the cam mechanism, etc. constitute a drive mechanism according to the present invention.

[0023]

Further, the needle bar 8 and the looper base 17 are rotated integrally in the horizontal direction by a rotation mechanism 22 consisting of a θ-axis pulse motor 19 and a gear mechanism 20 provided in the bed portion 4. It is now possible to do so. In this case, by pulse control of the θ-axis pulse motor 19,
The needle bar 8 and the looper base 17 are designed to be rotated by an angle of 1.8 degrees as a minimum unit.

[0024]

The bed portion 5 includes the looper base 1.
A lower knife 22 is replaceably mounted on the rear side of the lower knife 7, and upper knives 23 that approach and separate from the lower knife 22 from above are each replaceably provided. The upper knife 23 is driven by an upper knife drive mechanism 24 (see FIG. 3), which includes an air cylinder or the like provided in the bed section 5, and cooperates with the lower knife 22 to perform processing as shown in FIG. An eyelet hole 2 consisting of an eyelet part 2a and a straight hole part 2b connected thereto is formed in the cloth 1. Note that four types of lower knife 22 are prepared in advance with different sizes of eyelet portions 2a (see Fig. 4), and one of them is attached to a mounting portion provided on bed portion 5. There is. Further, in this embodiment, an overlock stitch 3 having a flow bartitch at the sewing start portion is performed on the eyelet hole 2.

[0025]

A work cloth 1 is provided on the upper surface of the bed portion 5.
A feed stand 25 is provided on which the items are set. The feed table 25 has a thin rectangular box shape as a whole, and although not shown in detail, predetermined portions of its lower surface and upper surface corresponding to the looper base 17 and the lower knife 22 are open. Further, the work cloth 1 is placed on the upper surface of the feed table 25.
A cloth presser (not shown) is provided for pressing the eyelet 2 at the left and right parts of the eyelet 2. And, this feed stand 25 is
Although not shown in detail, a feed mechanism 28 (see FIG. 3) consisting of an It is designed to be moved horizontally in the direction (back and forth). In addition, in this embodiment, the feed table 25 is
It is designed to move in both the axial and Y-axis directions with a minimum unit of 0.2 mm.

[0026]

Now, as shown in FIG. 4, the operation panel 11 includes an item display section 29 for selecting the type of overlock stitch that the user wishes to perform, a liquid crystal display 30 for displaying numbers up to four digits, Up and down keys 31a and 31b
, a select key 31c, and a pointer key 31d. Further, as shown in FIG. 3, the operation panel 11 is provided with a display device 39 made of, for example, an LCD. The item display section 29 includes the eyelet shape, the stitch pitch a of the straight hole 2b,
Correction items such as sewing length b (length dimension of straight hole portion 2b), flow bar length c, number of stitches d for eyelet portion 2a, and eyelet correction are listed, and furthermore, items for eyelet correction are listed. teeth,
It is subdivided into two items: stitch number position and movement direction. Furthermore, LEDs 32 are provided corresponding to each of these items. On the display screen 39a of the display device 39, the shape of the eyelet 2a and the needle drop position are displayed in an enlarged manner, as will be described later.

[0027]

By operating this operation panel 11 (key operation section 31), the user can select one of the four eyelet shapes according to the shape of the lower knife 22, and can also select one of the four eyelet shapes according to the shape of the lower knife 22. It is now possible to specify the desired (multiple of 0.2 mm) stitch pitch a, stitch length b, and flow bar length c. Furthermore, the eyelet part 2a
It is possible to select and input the number of stitches d within a predetermined range, and also to specify a desired needle drop position, as will be described in detail later. In this way, the operation panel 11 functions as an input means according to the present invention. Although not shown, a mode selection switch, a knife method selection switch, a sewing speed adjustment knob, and the like are provided at the top of the operation panel 11. When the program mode is set by the mode selection switch, the designation can be changed by operating the operation panel 11.

[0028]

The control device 16, as shown in FIG.
Based on the user's operation of the operation panel 11 and start/stop switch 12, the upper knife drive mechanism 24 is controlled according to the program stored in the ROM 14 and stitch data to be described later, and the drivers 33, 34, 35 ,3
6, the sewing machine motor 10, the X-axis pulse motor 2
6, Y-axis pulse motor 27, θ-axis pulse motor 19
It is designed to control the energization and disconnection of each. Further, a needle position detection signal from a needle position detection sensor 37 that detects the rotational position of the main shaft 18 is input to the control device 16, and this signal controls the X-axis pulse motor 2.
6, Y-axis pulse motor 27 and θ-axis pulse motor 1
It is designed to obtain the timing of energization to 9. Furthermore, an external storage device 38 storing reference stitch data, which will be described later, is connected to the control device 16. The display device 39 is also controlled by this control device 16.

[0029]

The stitch data will now be described. In the sewing machine of this embodiment, with respect to the eyelet hole 2 formed in the workpiece cloth 1, as shown by arrows A, B, and C in FIG. A series of overlock stitches 3 are executed in order from the left side of the straight hole portion 2b. At this time, the control device 16 moves the feed base 25 so that the needle bar 8 is moved relative to the work cloth 1 in the order of arrows A, B, and C. Also, when sewing the semicircular part of the upper half of the eyelet part 2a, the needle bar 8 and the looper base 1
7 is rotated counterclockwise by a predetermined angle θ (total rotation of 180 degrees) when viewed from above, thereby forming radial stitches around the eyelet portion 2a.

[0030]

[0024] The stitch data is
It consists of a set of unit data indicating the axial feed amount, the Y-axis feed amount, and the rotation angle θ of the looper base 17 and needle bar 8, and the control device 16 sequentially reads out this stitch data one unit at a time. It controls the energization of the X-axis pulse motor 26, the Y-axis pulse motor 27, and the θ-axis pulse motor 19. At this time, in the straight hole portion 2b, the sewing needle 7 is moved to N1 and N2 in FIG. 7 with respect to the work cloth 1.
, N3, N4,..., but the main shaft 1
With one rotation of 8, N1, which corresponds to the swing width L of the needle bar 8,
When the needle bar 8 rises between the needle drop at two locations N2 and the next needle drop at N3, the feed bar 25 is fixed in the Y-axis direction based on the timing from the needle position detection sensor 37. The feed movement is repeated by the feed amount a, thereby forming a so-called serrated seam. When sewing the lower half of the eyelet 2a, the stitch data is set so that the feed bar 9 is fed by a predetermined feed amount in the X-axis direction and the Y-axis direction for each stitch, and When sewing the semicircular part of the upper half, the feed bar 9 is fed by a predetermined feed amount in the X-axis direction and the Y-axis direction for each stitch, and at the same time, every other stitch is sewn by a predetermined feed amount using the inner needle drop point Pi as a reference. The stitch data is set so that the looper base 8 and needle bar 6 are rotated counterclockwise by the rotation angle θ.

[0031]

In this case, the control device 16 determines the number of stitches in the straight hole portion 2b and the flow bar portion based on the stitch pitch a, stitch length b, and flow bar length c input from the operation panel 11. Then, stitch data for the straight hole portion 2b and the flow bar portion is automatically created. On the other hand, in this embodiment, the external storage device 38 stores in advance reference stitch data for forming a standard stitch for the eyelet portion 2a.

[0032]

An example of the needle drop position for the eyelet portion 2a based on this reference stitch data will be described with reference to FIG. Here, the needle drop position inside the eyelet 2a is defined as a point Pi(n).
The outer needle drop position is represented by a point Po(n). The sewing needle 7 has points Pi (n-1) and Po (n-1).
), point Pi(n), point Po(n), point Pi(n+
1) It falls in the order of..., but in the figure, the point Pi (
In order to drop the needle bar 8 to point Po(n-1) after falling at point Po(n-1), the needle bar 8 is relatively moved by Δx(n-1) in the X-axis direction and by Δy in the Y-axis direction. (n-1)
(This position is point Pc(n-1)
), and the needle is swung at a needle swing width L in a state where it is rotated by Δθ(n-1). Therefore, one unit of stitch data at this time is Δx(n-1
), Δy(n-1), Δθ(n-1). Furthermore, the stitch data when moving from point Po(n-1) to point Pi(n) is such that the rotation angle θ is 0 and the point Pc
The amount of feed in the X-axis and Y-axis directions is set to just move from point (n-1) to point Pi(n). Note that the interval between the grid lines in FIG.
This shows that it is the smallest unit of movement. In this embodiment, since the rotation angle θ is set based on the inner needle drop point Pi, the inner needle drop point Pi is always located at the intersection of the grid lines. Such standard stitch data is prepared in correspondence with the eyelet shape and the number of eyelet stitches d, and is stored in the external storage device 38 in advance. When the control device 16 receives the input of the eyelet shape and the number of eyelet stitches d from the operation panel 11, it loads the corresponding reference stitch data into the RAM 15. At the same time, the needle drop position according to the reference stitch data is displayed on the screen 39a of the display device 39 based on the reference stitch data. When an input for eyelet correction is made, the stitch data on the RAM 15 is corrected in accordance with the input. Therefore, in this embodiment, the RAM 15 functions as a storage means according to the present invention, and the control device 16 functions as a stitch data creation means according to the present invention. In this embodiment, the outer needle drop point Po can be changed.

[0033]

Next, the operation of the above structure will be explained with reference to FIGS. 1, 2, and 5. When the power of the sewing machine main body 4 is turned on and the program mode is set by the mode selection switch, setting and creation of stitch data is executed in the steps shown in the flowcharts of FIGS. 1 and 2. Although these are one continuous flowchart,
The figure is divided into two parts due to space limitations.

[0034]

First, in step S1, various settings are performed. This is performed by the user by operating keys on the key operation unit 31 of the operation panel 11, and here, first, the eyelet shape is selected. To make this selection, first the LED 32 in the "eyelet shape" section of the item display section 29 lights up, and in this lighting state, the user presses the up key 32.
a or down key 31b to display the liquid crystal display 30.
This is done by displaying the number (1 to 4) of the desired eyelet shape and then turning on the select key 31c. Of course, the eyelet shape selected here matches the shape (type) of the lower knife 22 attached.

[0035]

[0029] Subsequently, the user selects the desired stitch pitch a.
, sewing length b, flow bar length c, and number of stitches in eyelet 2a d
are input in sequence using the same key operations. As a result, the control device 16 creates sewing data for the straight hole portion 2b and the flow bar portion, and stores this in the RAM 15. Then, when the number of eyelet stitches d is input, in step S2, the reference stitch data of the corresponding eyelet 2a along with the eyelet shape are read out from the external storage device 38 and stored in the RAM.
It is copied to 15 predetermined areas. In addition, the number of stitches d at this time
In the "Number of stitches" used in the number of stitches position in the detailed item for eyelet correction below, the number of stitches is 1 when the sewing needle 7 falls in two places, inside and outside.

[0036]

When the reference stitch data for the eyelet portion 2a is thus read out from the external storage device 38, the display screen 39a of the display device 39 is cleared in step S3.
Next, in step S4, the grid lines and the shape of the corresponding eyelet portion 2a are displayed in an enlarged manner on the display screen 39a. here,
As shown in FIG. 5, the grid lines cover the display screen 39a vertically and horizontally (Y
(corresponding to the axial direction and the X-axis direction) are drawn at equal intervals so as to partition the As mentioned above, the spacing of the grid lines is based on the actual work cloth 1.
0.2 mm, which corresponds to the minimum unit of movement of the feed table 25, and one square section divided by grid lines will be referred to as a unit square section here.

[0037]

[0031] Then, in step S5, the display screen 39
In a, a needle movement diagram in which the needle drop points Pi and Po are successively connected with straight lines is displayed, superimposed on the grid lines and the shape of the eyelet portion 2a. As a result, the shape of the seam around the eyelet 2a is displayed in an enlarged manner, and the user can
You can check the seam shape by looking at the .

[0038]

Now, when the input of the number of eyelet stitches d is completed, the LED 32 corresponding to "e eyelet correction" on the item display section 29 is lit. Here, the user selects the standard stitch data, that is, the display screen 39a for the eyelet 2a.
If the stitch shape displayed in is acceptable, switch the mode selection switch to sewing mode. Then, the answer is Yes in step S6, and thereafter, the sewing operation is started by operating the start/stop switch 12. At this time, the eyelet portion 2a is sewn using the standard stitch data.

[0039]

On the other hand, the user displays the stitch shape on the display screen 3.
If you want to change what is displayed at 9a, turn on the select key 31c. With this, the answer is Yes in step S7, and correction input can be performed. Now, the user selects the n-th needle drop point Po(
n) If you want to change the position of , perform the following operations.

[0040]

First, the LED 32 corresponding to "e1 Stitch number position" on the item display section 29 lights up, so enter the stitch number position number of the needle drop point Po(n) that you want to correct by pressing the up key 31a or the down key. 31b to display on the liquid crystal display 30, the selection key 31c is turned on to specify (step S8). Here, stitch number position numbers are assigned as 1, 2, 3, etc. in the direction of progress of the sewing work, and in the example of Fig. 5, n is 5.
It will be the th.

[0041]

Then, in step S9, the display screen 3
9a, the unit grid including the designated point Po(n) begins to blink repeatedly (in FIG. 5, this unit grid is shown with diagonal lines downward to the right for convenience). Also, at this time, LED3 corresponding to "e2 movement direction"
2 lights up.

[0042]

Here, the user operates the pointer key 31d of the key operation section 31 to select the point Po(n).
Instruct where to change the position of (step S1
0). The pointer key 31d is made up of four keys indicating the front, back, left, and right directions, and by operating these keys, the blinking position of the unit grid section moves on the display screen 39a. If you want to change the position of needle drop point Po(n) to point Po(m), for example, press the left and forward keys twice, and the blinking position will move in order and point Po(m) will be changed. The included unit grids begin to blink (in FIG. 5, the blinking unit grids are shown with diagonal lines extending downward to the left for convenience).

[0043]

Then, in the next step S12, the unit stitch data when the sewing needle 7 moves from the point Pi(n) to the position corresponding to the unit grid including the point Po(m), that is, in the X-axis direction The feed amount u, the Y-axis direction feed amount v, and the rotation angle w are calculated. Now, as shown in Fig. 5, the x-axis and y-axis are determined, and the coordinate values of point Pi(n) are (a, b),
The total rotation angle of the needle bar 8 up to point Pi(n) is α, and the x coordinate of the unit grid including the point Po(m) is x1≦x≦
If x2, y coordinates are y1≦y≦y2, then u, v
, w is x1≦a+u+Lcos(α+w)≦x
2y1≦b+v+Lcos(α+w)≦y2 is satisfied. Among the combinations of u, v, and w that satisfy both formulas, the reference data (X-axis direction feed amount, Y-axis direction feed amount, and rotation angle θ are in this order Δx(n), Δy(n), Δθ(n ))
Find the value with the smallest difference between the two and use this as the value of u, v, and w. Of course, u and v are integral multiples of 0.2 mm (0.2 mm and 0.6 mm, respectively in the example of FIG. 5), and w is an integral multiple of 1.8 degrees.

[0044]

Once the amount of movement has been determined in this way, in the next step S13, point Po(m) is set next to point Pi(n).
The stitch data on the RAM 15 is rewritten to cause the needle to drop. Here, the reference stitch data is already stored in the RAM 15.
The reference stitch data for making the needle drop at point Po(n) next to point Pi(n) is written at a predetermined location.
As mentioned above, the feed amount in the X-axis direction, the feed amount in the Y-axis direction, and the rotation angle θ are determined in the following order: Δx(n), Δy(n), Δθ(n)
is remembered. On the other hand, if the data is u, v
, w, the needle drop position to point Po(m) is corrected.

[0045]

At the same time, the stitch data for causing the needle to drop from point Po(m) to point Pi(n+1), which is the next needle drop position, is also rewritten. Also, according to the standard stitch data, Δxi(n) −Δx(n), Δyi(n
) −Δy(n) ,0 becomes Δxi(n)
-u, Δyi(n) -v, Δθ(n) -w. Here, from the next point Pi(n+1) to the point P
In relation to the rotation angle when moving to o(n+1), the rotation angle θ is not set to 0, but is corrected so as to return to the angle in the case of the reference stitch data.

[0046]

In steps S14 and S15, the straight line Pi(n)-Po(n) and the straight line Po(n)-Pi(n+1) are erased on the display screen 39a, and a new straight line Pi(n)-Po( m) and the straight line Po(m
) −Pi(n+1) is drawn (indicated by a broken line in FIG. 5). With this, the user can confirm the needle movement chart (stitch shape) based on the newly created stitch data on the display screen 39a.

[0047]

As described above, the position of needle drop point Po(n) is corrected to point Po(m). Needle entry point P to be corrected
If there are multiple o's, step S8 to step S1
By repeating step 5, stitch data corresponding to the desired needle drop position is created. In addition, the above straight hole part 2
Stitch data for b and flow bar part, and eyelet part 2a
The stitch data for the stitches are combined to form the entire stitch data.

[0048]

[0042] When the sewing work is started, first, the work cloth 1 is
The upper knife drive mechanism 24 is driven while the feed base 25 on which the knife is set is sent to a predetermined knife drive position, and the lower knife 2
2 and the upper knife 23 cooperate to form the eyelet hole 2 in the work cloth 1 (in the case of the tip knife method). Then, based on the stitch data created as described above, the control device 16
The drive mechanism (sewing machine motor 10), feed mechanism 28 (X-axis pulse motor 26 and Y-axis pulse motor 27), and rotation mechanism 21 (θ-axis pulse motor 19) are controlled, and as shown in FIG. First, sew the right side of the flow bar part and straight hole part 2b as shown by arrow A, then sew the eyelet part 2a as shown by arrow B, and then sew the left side of straight hole part 2b as shown by arrow C. Overlock stitch 3 is automatically executed for eyelet hole 2 in the procedure.

[0049]

At this time, if the needle drop position of the eyelet 2a is not corrected, a standard stitch is formed based on the reference stitch data stored in advance, and the needle drop position is not corrected. In this case, overlock stitching is performed at the needle drop position specified by the user based on the corrected stitch data.

[0050]

As described above, according to this embodiment, unlike the conventional sewing work in which sewing work is performed using fixed one type of stitch data, it is possible to specify an arbitrary needle drop position using the operation panel 11. The control device 16 creates stitch data according to the instructions and executes the sewing work.

[0051]

[0045] Therefore, it becomes possible for the user to freely change the specific shape of the stitches around the eyelet 2a to what he or she desires, and it is possible to perform a wide variety of different types of overlock stitches. Can be done. As a result, it is possible to fully meet the needs of users, such as the fact that different shapes of seams are desirable depending on the material and type of the processed cloth 1, and the diversification of user preferences regarding the appearance of seams. It is.

[0052]

[0046] Further, on the display screen 39a of the display device 39, the shape of the eyelet 2a and the surrounding needle drop positions according to the stitch data are displayed in an enlarged manner. Because it can be done
The user can easily understand the needle drop position intuitively and can easily perform the task of indicating the needle drop position. In particular, in this embodiment, instructions for how much to shift the needle drop position from the needle drop point Po(n) according to the reference stitch data can be given by moving the blinking position by pressing the pointer key 31d. This operation can be performed much more easily than, for example, inputting the coordinate values of the needle drop position using numbers.

[0053]

In the above embodiment, the stitch data is calculated such that the unit grid section is specified and the needle drop point falls within the grid, but the intersection point of the grid lines is specified and the point The calculation may be performed so that the needle drop point is located near . Further, although the needle drop point Pi inside the eyelet portion 2a is treated as a fixed point, a configuration may be adopted in which this point is also corrected. Although the reference stitch data is stored in the external storage device 38 in advance, the stitch data around the eyelet 2a may be created from the beginning. Furthermore, a configuration may be adopted in which the created stitch data can be saved.

[0054]

In addition, the display device may be configured to connect a separate CRT display without being incorporated into the operation panel 11, or the display device may be configured to be used for other purposes. The invention may be modified and implemented as appropriate without departing from the gist of the invention.

[0055]

[0049]

[0056]

As is clear from the above description, the eyelet sewing machine of the present invention is provided with a display device that magnifies and displays the shape of the eyelet-like hole and the needle drop position around the hole. An input means for instructing the needle drop position on the display screen is provided, and the stitch data is created by the stitch data creation means based on the needle drop position inputted by the input means, so that the user can easily This has excellent effects in that it is possible to perform overlock stitching around the eyelet in a desired stitch shape, and to easily specify the needle drop position for this purpose.

[Brief explanation of the drawing]

[Fig. 1] Flowchart (Part 1) of modifying stitch data of an eyelet section showing an embodiment of the present invention.

[Figure 2] Flowchart for modifying the stitch data of the eyelet (Part 2)

[Figure 3] Block diagram showing electrical configuration

[Figure 4] Plan view of the operation panel

[Figure 5] Plan view showing an enlarged view of the display screen

[Figure 6] Side view of the entire sewing machine

[Figure 7] Enlarged top view of processed fabric with overlock stitching

[Explanation of symbols]

1 is the work cloth, 2 is the eyelet hole, 2a is the eyelet part, 2b is the straight hole part, 4 is the sewing machine body, 7 is the sewing needle, 8 is the needle bar, 10 is the sewing machine motor (drive mechanism), 11 is the operation panel ( 15 is a RAM (storage means), 16 is a control device (stitch data creation means), 17 is a looper base, 21 is a rotating mechanism, 25 is a feed table, 26 is a pulse motor for the X-axis, 27 is a A Y-axis pulse motor, 28 a feed mechanism, 31 a key operation section, 39 a display device, and 39a a display screen.

Claims (1)

[Claims] [Claim 1] Overlock stitching is performed radially around eyelet-shaped holes formed in the workpiece cloth set on a feed table, and the sewing needle and the looper cooperate with each other. a drive mechanism that synchronously drives the needle bar and the looper so as to repeat a stitch forming operation of forming a stitch on the work cloth; a feeding mechanism that feeds and moves the feed base when the needle bar rises; a rotation mechanism for rotating the looper base and the needle bar, and a storage means for storing stitch data specifying the feed amount of the feed base for each stitch and the rotation angle of the needle bar and the looper base. a control device that controls the drive mechanism, feed mechanism, and rotation mechanism based on the stitch data stored in the storage means; and a control device that controls the shape of the eyelet-shaped hole and the surroundings of the hole according to the stitch data. a display device for enlarging and displaying the needle drop position on the display screen; an input means for instructing the needle drop position on the display screen; An eyelet hole sewing machine, comprising: stitch data creation means for creating data.