JPH04261694A - 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. CONSTITUTION:A reference stitch data of an eyelet darning is read out of an outside memory 38 (S2) for indicating a given position and also X, Y and thetadata for moving the position to the given one is inputted directly (S5) for correcting stitch data (S6 and S7). 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

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.

0002

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.

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.

[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.

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.

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.

[0007]

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.

[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.

[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.

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.

[0011]

[Means for Solving the Problems] The eyelet overlock sewing machine of the present invention performs overlock stitching radially around an eyelet-shaped hole formed in the work cloth set on a feed table. a drive mechanism that synchronously drives a needle bar and the looper so as to repeat a stitch forming operation of forming stitches on the work cloth through cooperation between the sewing needle and the looper;
a feeding mechanism that feeds and moves the feed base when the needle bar rises; a rotation mechanism that rotates the looper base on which the looper is provided and the needle bar; a feed amount of the feed base for each stitch; and a rotation mechanism that rotates the needle bar. A control device that controls the drive mechanism, feed mechanism, and rotation mechanism based on stitch data specifying rotation angles of the rod and the looper base, and a reference stitch data storage means that stores reference stitch data. an input means for specifying a needle drop position different from the needle drop position according to the reference stitch data; and a stitch corrector for correcting the stitch data based on the needle drop position inputted by the input means. It is characterized in that it is equipped with eye data correction means.

0012

[Operation] According to the above means, the control means 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. At this time, using the input means,
The user can specify a needle drop position different from the needle drop position according to the reference stitch data. When the input means receives an input, the stitch data correction means corrects the stitch data so that the specified needle drop position is obtained.

Therefore, if the needle drop position is not changed by the input means, the control device executes the overlock stitch based on the reference stitch data stored in the reference stitch data storage means, and When the needle drop position is changed, overlocking is performed at the needle drop position desired by the user based on the stitch data corrected by the stitch data correction means.

[0014]

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. 2 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.

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.

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.

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.

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. 2), which includes an air cylinder 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. In addition, four types of lower knife 22 are prepared in advance with different sizes of the eyelet part 2a (see FIG. 3), and one of them is attached to the attachment part provided on the bed part 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 2.

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. 2) consisting of an X-axis pulse motor 26 and a Y-axis pulse motor 27 provided in the bed section 5 moves the 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.

Now, as shown in FIG. 3, 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 key operation section 31 including a select key 31c is also provided. The item display section 29 includes eyelet shape,
Stitch pitch a, stitch length b of straight hole part 2b (straight hole part 2
Correction items such as the length dimension b), the length c of the flow bar, the number of stitches d for the eyelet 2a, and eyelet correction are listed.
Furthermore, the eyelet correction items are subdivided into the following items: stitch number position, x-direction correction amount, y-direction correction amount, and θ-direction correction amount. Furthermore, LEDs 32 are provided corresponding to each of these items.

By operating this operation panel 11, the user can select one of the four eyelet shapes according to the shape of the lower knife 22, and can also select the desired shape of the straight hole part 2b (0. It is now possible to specify the stitch pitch a (a multiple of 2 mm), the stitch length b, and the flow bar length c. Furthermore, the number of stitches d for the eyelet part 2a
In addition to being able to select and input within a predetermined range, it is also possible to specify a needle drop position that is different from the needle drop position according to the standard stitch data, as will be described in detail later. There is. With this, operation panel 1
1 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.

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 consisting of an FDD or the like that stores reference stitch data, which will be described later, is connected to the control device 16. Therefore, in this case, this external storage device 38 is a reference stitch data storage device according to the present invention. It functions as a means.

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. When sewing the semicircular portion of the upper half of the eyelet 2a, the needle bar 8 and the loop base 17 are rotated counterclockwise by a predetermined angle θ (seeing from the top).
By rotating the eyelet 2 by 180 degrees as a whole,
Seams are formed radially around a.

[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.

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, the external storage device 38 stores in advance reference stitch data for forming standard stitches for the eyelet portion 2a.

FIG. 4 shows an example of the needle drop position for the eyelet 2a based on this reference stitch data. Here, the inner needle drop position of the eyelet 2a is represented by a point Pi(n), and the outer needle drop position is represented by a point Po(n). The sewing needle 7 is located at point Pi(n-1) and point Po(n-1).
, point Pi(n), point Po(n), point Pi(n+1)
In the figure, the point Pi(n-
1) 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 Δy(n-1) in the Y-axis direction. -1) (this position corresponds to point Pc(n-1)) and rotated by Δθ(n-1) so that the needle swings with the swing width L. It has become. Therefore, one unit of stitch data at this time is the feed amount in the X-axis direction,
In the order of Y-axis direction feed amount and rotation angle θ, Δx(n-1)
, Δy(n-1), Δθ(n-1). Also,
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(n
-1) The feed amount in the X-axis and Y-axis directions is set to just move from point Pi(n) to point Pi(n). Note that the vertical and horizontal lines on the drawing are formed at intervals of 0.2 mm, which indicates that one scale is the minimum unit of movement of the feed table 25. In this embodiment, since the rotation angle θ is set based on the inner needle drop point Pi, the inner needle drop point Pi
always falls at the intersection of the grid.

Such standard stitch data is prepared and stored in advance, one each for the eyelet shape and the number of eyelet stitches d. When the control device 16 receives an input for eyelet correction from the operation panel 11, the control device 16 corrects the reference stitch data in accordance with the input. Therefore, this control device 16 functions as a stitch data correction means according to the present invention. In this embodiment, the outer needle drop point Po can be changed.

Next, the operation of the above configuration will be explained in FIGS. 1 and 4.
This will be explained with reference to FIG. When the power of the sewing machine body 4 is turned on and the program mode is set by the mode selection switch, stitch data is first set according to the procedure shown in the flowchart of FIG.

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

[0030] 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, it is assumed that the sewing needle 7 falls in two places on the left and right and is counted as 1 stitch.

[0031] When the input of the number of eyelet stitches d is completed,
LE corresponding to “e Eyelet correction” in item display area 29
D32 is lit. Here, the user selects the eyelet part 2a.
If the standard stitch data can be used as is, switch the mode selection switch to sewing mode. Then,
The answer is Yes in step S3, and the sewing operation is then started by operating the start/stop switch 12. At this time, the eyelet portion 2a is sewn using the reference stitch data.

On the other hand, if it is desired to correct the needle drop position of the eyelet 2a to be different from the needle drop position according to the reference stitch data, the select key 31c is turned on. With this, Step S4 becomes Yes, and Step S4 continues.
In step 5, the needle drop position is specified using detailed items. Now, the user selects the n-th needle drop point Po(
If you want to change the position of n) to point Po(m),
Perform the following operations.

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 it on the liquid crystal display 30, and then specify by turning on the select key 31c. Here, stitch number position numbers are assigned as 1, 2, 3, . . . in the direction of progress of the sewing work, and n is the fifth in the example of FIG.

Next, by performing similar operations, the x-direction correction amount, the y-direction correction amount, and the θ-direction correction amount are sequentially designated. In this embodiment, the user points the sewing needle 7 at a point Pi(n).
The amount of feed in the X-axis direction, the feed amount in the Y-axis direction, and the rotation angle θ when moving from point Po(m) to point Po(m) are directly designated. That is, as shown in FIG. 4, the point Pi(n)
To move from point Po(m), needle bar 8 is relatively moved by u in the X-axis direction and v in the Y-axis direction (point Pc(
(corresponding to m)), and the needle may be swung at a swing width L while being rotated by an angle w. Therefore, these X-axis direction feed amount u (specifically 0.2 mm), Y-axis direction feed amount v (specifically 0.6 mm), and rotation angle w (1.8
(integer multiple of degrees) is specified.

[0035] Once this input is made, the next step S6
At this point, the stitch data on the RAM 15 is rewritten so that the needle drops at point Po(m) next to point Pi(n). Here, as shown in FIG. 5, the reference stitch data is already RA
As can be understood from Fig. 4, the reference stitch data written in a predetermined location of M15 and for making the needle drop at point Po(n) after point Pi(n) is based on the feed amount in the X-axis direction. ，
Δx(n), Δy in the order of Y-axis direction feed amount and rotation angle θ
(n) and Δθ(n). On the other hand, by rewriting the data as u, v, w, the needle drop position to point Po(m) is corrected.

[0036] Then, in step S7, point Po
Point Pi(n+1) which is the next needle drop position from (m)
The stitch data for needle drop is rewritten. Also, as shown in FIG. 5, according to the standard stitch data, Δ
xi(n) −Δx(n) , Δyi(n) −Δy(
n), 0 becomes Δxi(n) −u, Δy
It is rewritten as i(n) −v, Δθ(n)−w. Here, from the next point Pi(n+1) to the point Po(n+1)
In relation to the rotation angle when moving to , 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.

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 S5 to step S7
By repeating this process, stitch data corresponding to the desired needle drop position is created. In addition, the above-mentioned straight hole part 2b
The stitch data for the flow bar portion and the stitch data for the eyelet portion 2a are combined to form the entire stitch data.

[0038] 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.

At this time, if the needle drop position of the eyelet part 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, overlocking is performed at the needle drop position specified by the user based on the corrected stitch data.

As described above, according to the present embodiment, unlike the conventional sewing work in which sewing work is performed using fixed one type of stitch data, the operation panel 11 allows sewing to be performed using arbitrary stitch data different from that based on the standard stitch data. The control device 16 creates stitch data according to the specification and executes the sewing operation.

[0041] Therefore, it becomes possible for the user to freely change the specific shape of the stitches around the eyelet portion 2a as desired, 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 satisfactorily meet requests such as the desire for seams of different shapes depending on the material and type of the processed cloth 1 and the diversification of user preferences regarding the appearance of seams. be.

In the above embodiment, the X-axis direction feed amount u, Y when moving from point Pi(n) to point Po(m)
Although the axial feed amount v and rotation angle w are directly specified, the point Po, which is the needle drop position according to the standard stitch data,
The position of the point Po(m) may be specified based on the amount of relative deviation from the point Po(m) in the X-axis, Y-axis, and θ-axis directions. Further, although the needle drop point Pi inside the eyelet portion 2a is treated as a fixed point, this point may be modified.

In addition, RO without providing the external storage device 38
The present invention can be implemented with appropriate modifications within the scope of the gist, such as using M14 as a reference stitch data storage means.

[0044]

[Effects of the Invention] As is clear from the above explanation, according to the eyelet hole sewing machine of the present invention, the needle drop position is different from that according to the reference stitch data stored in the reference stitch data storage means. In addition to providing an input means for specifying the needle drop position, a stitch data correction means for correcting stitch data based on the needle drop position input by this input means is provided, so that the user can easily select the desired stitch. This has an excellent effect in that it is possible to perform overlock stitching around the eyelet part depending on the shape.

[Brief explanation of the drawing]

FIG. 1 is a flowchart for modifying stitch data of an eyelet section showing an embodiment of the present invention.

[Figure 2] Block diagram showing electrical configuration

[Figure 3] Plan view of the operation panel

[Figure 4] Needle movement diagram showing an enlarged example of the needle drop point in the eyelet area

[Figure 5] Diagram showing how data stored in RAM is changed

[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 portion, 2b is the straight hole portion, 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 an operation panel (input means), 16 is a control device (stitch data correction means), 17 is a looper base, 21 is a rotating mechanism, 25 is a feed base, and 26 is an X
27 is a pulse motor for the axis, 28 is a feed mechanism, and 38 is an external storage device (reference stitch data storage means).

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 a looper base and a needle bar provided with a rotation mechanism; and a rotation mechanism for rotating a looper base and a needle bar, and a rotation mechanism for rotating a looper base and a needle bar, and a rotation mechanism for rotating a looper base and a needle bar, and a rotation mechanism for rotating a looper base and a needle bar, and a rotation mechanism for rotating a looper base and a needle bar, and a rotation mechanism for rotating a looper base and a needle bar. a control device that controls the mechanism, the feeding mechanism, and the rotating mechanism; a reference stitch data storage means that stores reference stitch data; and a needle drop position that is different from the needle drop position according to the reference stitch data. An eyelet hole sewing machine comprising: an input means for specifying a position; and a stitch data correction means for correcting the stitch data based on the needle drop position inputted by the input means.