JP2001327776A - Controlling device for sewing machine and method for sewing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controlling device for a sewing machine which can give no feeling of stiffness on a taper bar tack part and can perform over-casting of a button hole with good appearance. SOLUTION: The controlling device 8 provided on the sewing machine 1 for forming an eyelet hole over-casting is constituted of a CPU 32, an ROM 31 and an RAM 33 and storing data containing the value of 'correction of the length of a taper bar' being a corrected value of the flow bar stopping part are stored in the RAM 33. Control data are corrected based on the value of 'correction of the length of a taper bar' and based on these corrected control data, the eyelet hole over-casting stitch 19 is formed in such a way that the length of sewing of the taper bar 19a at the start of sewing and the length of sewing of the taper bar 19b at the end of sewing are different.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sewing machine control device for performing buttonhole sewing such as a buttonhole, and a sewing method.

[0002]

2. Description of the Related Art Conventionally, a buttonhole (hereinafter referred to as an eyelet hole) comprising a hole portion which is a drop-shaped hole and a continuous linear cut is formed in a cloth to be sewn, and the eyelet of the cloth is formed. A series of overlock sewing is provided around the hole to automatically perform a series of overlock stitches to form a seam.
The sewing machine includes a needle bar (not shown) which is provided on an arm and which is vertically moved and moved left and right by a driving mechanism, and a looper which is provided below the needle bar of the bed and is driven synchronously with the needle bar. A feeder provided on the bed portion, and on which a sewing object is set and moved by a feeder, a presser for pressing the cloth against the feeder, and a female mechanism for forming eyelets in the cloth. Have In addition, in order to perform overlock stitching on the eyelet portion of the eyelet hole (the arc-shaped portion of the drop-shaped hole portion), a turning mechanism that rotates the looper and the needle bar around a vertical rotation axis so that the seam is radial. Having.

In the sewing machine, the above-described mechanisms are controlled by a control device including a microcomputer, and perform overlock stitching. Further, the seam formed on the left and right of the cut of the eyelet hole by the turning mechanism is configured such that the left and right are reversed on one side edge side and the other side edge side of the cut.

[0004] Further, at the time of overlock stitching of the eyelet hole, bar tacking, which is generally called flow bar tacking, is also performed to prevent fraying at the start and end of sewing and for reinforcement. With such an eyelet overlock sewing machine, the eyelet length,
Performs eyelet buttonhole stitching of any shape by making various settings that determine the shape of stitch length, stitch pattern, stitch pitch, number of stitches (number of stitches), etc. You can do it.

[0005]

However, in the conventional eyelet overhole sewing machine, the setting item for the flow bartacking portion is only the length of the flow bartacking. That is, the flow bartacking formed at the start and the end of the sewing is set to the same set length, and the bartacking is performed by overlapping and sewing. And, when there are many overlapping portions of the flow bartacking, there is a problem that a feeling of stiffness appears and the appearance deteriorates.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine control device and a sewing method capable of performing a buttonhole buttonhole stitching without giving a feeling of stiffness to a flow bartacking portion and having a good appearance.

[0007]

In order to solve the above-mentioned problems, for example, as shown in FIGS. 1 to 9, the invention according to claim 1 includes left and right side stitch portions (for example, a right side straight portion 19c and a right side straight portion 19c). A left straight portion 19d), a flow start bartacking portion (for example, a flow start bar 19a) formed prior to the sewing of the one side sewing portion, and a sewing portion formed after finishing the sewing of the other side sewing portion. A sewing machine having a sewing means for applying an overlock seam (for example, an eyelet hole overlock seam 19) of a hole such as a button hole provided with a sewing end flow bar-tacking portion (for example, sewing end flow bar 19b) to the workpiece. A control means (1) for controlling the sewing means so as to form an overlock stitch in which the sewing length of the flow bartacking portion at the start of sewing and the sewing length of the flow bartacking portion at the end of sewing are different. , CPU32, R M31, RAM 33), characterized in that it comprises a.

According to the first aspect of the present invention, the overlock stitch is formed such that the sewing length of the bar-tacking portion at the start of sewing and the sewing length of the bar-tacking portion at the end of sewing are different from each other. In addition, it is possible to provide a portion in which only the first part is sewn without the overlapping of the flow start part and the flow end part. Thereby, the stiffness caused by double-stitching of the flow bar-tacking portion can be suppressed, and an overlooking overlock stitch can be applied. In addition, the sewing length of the flow bartacking part at the start of sewing and the sewing length of the flow bartacking part at the end of sewing differ as long as the bartacking part at the sewing start and the bartacking part at the sewing end overlap each other. It is not preferable to set the stitch length of one of the flow bar-tacking portions to “0”. That is, the portion where the two flow bartacks are overlapped and sewn can prevent fraying of the overlock seam and ensure reinforcement.

The invention described in claim 2 is, for example, shown in FIGS.
As shown in (1), in the control device for a sewing machine according to claim 1, storage means (for example, a RAM 33) for storing control data indicating a sewing pattern of an overlock stitch, and needle drop position data are created based on the control data. Data creation means (for example, CPU32, RAM33),
The control data is a flow bartacking correction data (for example, a "flow barta length correction" value) which is a correction amount of the sewing length of either the sewing start flow bartacking portion or the sewing end flow bartacking portion. And based on the flow bartacking correction data,
Flow bar-tacking correcting means for correcting the needle entry position data of the flow bar-tacking portion so that the sewing length of the flow bar-tacking portion at the start of sewing and the sewing length of the flow bar-tacking portion at the end of sewing are different from each other so as to form an overlock stitch. (For example, CPU32, RAM3
3), wherein the control means performs overlock stitching based on the needle drop position data corrected by the flow bartacking correction means.

According to the second aspect of the invention, the same effects as those of the first aspect can be obtained. In addition, the needle entry position data is created from the control data by the data creation unit, and the needle bar entry position data is sewn by the flow bartacking correction data using the flow bartacking correction data included in the control data. The stitch length at the stop portion and the stitch length at the end portion of the sewing at the end of the sewing can be corrected so as to form an overlock stitch. Then, since the control means forms the overlock stitch based on the corrected needle drop position data, the control means forms a portion in which the flow bartacking portion at the start of sewing and the flow bartacking portion at the end of the sewing do not overlap, thereby giving a feeling of stiffness. , And overlooking can be performed with good appearance. Also, instead of inputting the data relating to the sewing lengths of the two flow bartacks, the sewing length of one of the two flow bartacks set to the same sewing length is not entered. By inputting the correction amount for changing the stitch length, data can be input while considering how much difference is made in the sewing length between the two flow bar-tacking portions. Further, by setting the correction amount to “0”, it is possible to return to the setting in which the two flow bartacking portions have the same sewing length without any mistake.

The flow bar correction data may be, for example, data of "length" which is added to or subtracted from the length of the flow bar-tacking portion, or "the number of stitches which is added to or subtracted from the flow bar-tacking portion". ".

The invention described in claim 3 is, for example, shown in FIGS.
3. The control device for a sewing machine according to claim 1, wherein the setting means (for example, the operation panel 7, the CPU 32, the RAM 3) sets the value of the flow bar tack correction data.
3) is provided.

According to the third aspect of the invention, the same effect as in the first or second aspect can be obtained, and the stitch length of the bar-tacking portion at the start of sewing can be obtained by arbitrarily changing the flow bar-tacking correction data. It is possible to adjust a correction amount that makes the sewing length of the bar-tacking portion different from the sewing length at the end of sewing. Also,
By arbitrarily changing the flow bartacking correction data, which is a correction amount, for example, a portion where the flow bartacking portion at the start of sewing and the flow bartacking portion at the end of sewing can be adjusted. This makes it possible to adjust the degree of reinforcement while ensuring the appearance of the overlock stitch according to the use or purpose.

The invention described in claim 4 is, for example, shown in FIGS.
A sewing method for a sewing machine provided with the sewing machine control device according to any one of claims 1 to 3, wherein the control means controls the sewing means so that the sewing start flow bar is formed. An overlock stitch is formed in which the stitch length of the stop portion is different from the stitch length of the flow-end bar-tacking portion at the end of sewing.

According to the invention described in claim 4, claims 1 to
In addition to providing the same effect as any one of No. 3, it is possible to provide a good-looking overlock seam while suppressing stiffness.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A control device for a sewing machine according to a first embodiment of the present invention will be described below with reference to the drawings. First, the configuration will be described. As shown in FIG. 1, a sewing machine 1 provided with a control device according to the first embodiment has a basic configuration as a sewing machine that performs eyelet buttonhole sewing. That is, the sewing machine 1 includes a bed portion 2 having a substantially rectangular box shape, a vertical trunk portion 3 provided at a rear portion of the bed portion 2, and an arm portion 4 extending forward from the vertical trunk portion. And a sewing machine table (not shown) on which the sewing machine main body 5 is mounted.
The sewing machine 1 includes an operation panel 7 and a control device 8 which will be described later. These may be provided on the sewing machine main body 5 side or on the sewing machine table side.

The sewing machine table is provided with, for example, a foot-operated start switch 9 (shown in FIG. 2). A needle bar 10 provided with a sewing needle 6 at a lower end thereof is provided at the distal end of the arm portion 4 so as to extend downward and vertically swing and swing right and left. Further, the bed portion 2 is provided with a looper base 11 having a looper portion 11a having a looper (not shown) and a spreader for assisting the looper at an upper portion thereof, facing the needle bar 10. Each drive mechanism for moving the needle bar 10 up and down and right and left and for driving the looper and the spreader in synchronization with the needle bar 10 is provided in the sewing machine main body 5 as follows.

That is, in the bed portion 2, a main shaft servomotor 12 is connected to a lower shaft (not shown) for driving a looper and a spreader, and the lower shaft is driven to rotate. The looper and the spreader are connected to the lower shaft via a looper driving mechanism and a spreader driving mechanism (not shown). The lower shaft is connected to the upper shaft in the arm section 4 via a transmission mechanism having a timing belt, and is transmitted from the lower shaft to drive the upper shaft. The upper shaft is connected to the needle bar 10 via a needle bar vertical drive mechanism and a needle bar swing mechanism (not shown), and drives the needle bar 10 up and down and swings the needle bar 10 right and left.

The needle bar 10 and the looper base 11 are Z
It is connected to a rotating mechanism having an axis pulse motor 14 (shown in FIG. 2) and a transmission means having a timing belt, so that the needle bar 10 and the looper base 11 rotate around a vertical rotation axis in synchronization. It has become. This is, as shown in FIG. 6, a drop-shaped hole 16 formed in an eyelet hole 16 formed in the cloth 15.
This is a mechanism for making the stitches radial when the overlock stitches around the semicircular portion a (that is, the peripheral edge of the drop-shaped hole 16a opposite to the linear cut 16b). Further, the needle bar 1 rotated by the rotation mechanism as described above.
0 and the looper base 11 are detected by a Z-axis origin sensor 24 (shown in FIG. 2) at the origin position.

A feed base 17 (shown in cross section in FIG. 1) on which the cloth 15 is set is provided on the upper surface of the bed 2 and a cloth 15 is set on the upper surface of the feed base 17.
A pair of cloth pressers 18 for pressing down (shown in the raised state)
Is provided. The feed base 17 has a thin rectangular box shape with an open lower surface as a whole, and an upper surface thereof is provided with a long opening in the front-rear direction between the pair of cloth pressers 18. The feed base 17 is provided with an X-axis pulse motor 20 (shown in FIG. 2) provided in the bed 2.
A feed mechanism including a Y-axis pulse motor 21 (shown in FIG. 2) and the like moves horizontally in the X direction (left-right direction) and the Y direction (front-back direction). Further, the feed table 17 moved by the feed mechanism as described above is
An X-axis origin sensor 22 (illustrated in FIG. 2) and a Y-axis origin sensor 23 (illustrated in FIG. 2) detect whether or not it is at the origin position.

Further, the sewing machine 1 has an eyelet hole 16
A scalpel mechanism is provided for opening. The scalpel mechanism includes a scalpel support (not shown) provided on the bed section 2 side, a movable scalpel 26 provided vertically above the scalpel support (not shown), and And a knife drive mechanism provided with a cloth cutting cylinder 27 (shown in FIG. 2, an air cylinder) for movement. In the knife mechanism of this example, the movable knife 26 does not move up and down along an arc, but moves up and down linearly. Further, a cylinder drive solenoid valve 28 for operating the cloth cutting cylinder 27 is connected to the cloth cutting cylinder 27. The scalpel mechanism pushes down the cloth 15 by lowering the movable scalpel 26 toward the scalpel pedestal with the cloth 15 set between the scalpel cradle and the movable scalpel 26.

Although description and illustration are omitted, the sewing machine 1 detects an actuator for driving the presser foot 18, a thread cutter, an actuator for driving the thread cutter, and the operation of these actuators. A sensor and the like are provided. Further, in the sewing machine 1 described above,
The movement of the feed table 17 is performed in the X direction and the Y direction, but the movement of the feed base 17 may be performed in the radial direction (r direction) and the arc direction (θ direction) determined by the angle.
In the configuration of the sewing machine 1 described above, the needle bar 10 having the needle 6, a mechanism for driving the needle bar 6, a looper and a spreader, a mechanism for supporting and driving the needle bar 10,
, A mechanism for driving this, the presser foot 18, and other associated mechanisms constitute sewing means for performing overlock stitching.

Next, the configuration and functions of the control device of the sewing machine will be described with reference to the block diagram of FIG. First, the control device 8
As a basic configuration, a program for controlling the sewing machine in advance, a ROM 31 in which data used in the program are stored, control data indicating a sewing pattern of an overlock stitch, input or set from the operation panel 7 RAM for storing needle drop position data and the like calculated by a CPU 32 described later based on data and programs
33, and the CP for performing various processes based on the program
U32. The ROM 31 stores a program for causing the CPU 32 to perform processing in the CPU 32 from setting of a sewing pattern, which will be described later, to punching and overlocking. That is, the CPU 32
And the ROM 31 and the RAM 33 serve as control means.
33 is storage means. The RAM 33 is backed up by a battery (not shown), and is configured to be able to retain the stored contents even when the power is turned off. The RAM 33 may be replaced with an EEPROM.

As shown in FIG. 3 (a), the control data is a data indicating a sewing pattern of the eyelet buttonhole stitching. The "keyhole length" indicated by the arrow a and the eyelet key indicated by the arrow b. The “sewing pitch” for the straight portion and the flow bar of the hole 16, the “number of eyelet stitches” indicated by the arrow c, and the arrow d
And a "flow bar length correction" (flow bar tack correction data) indicated by an arrow e. That is, one set of the data of these five items is one control data. The straight portion is a portion of the periphery of the eyelet hole 16 excluding the semicircular portion of the drop-shaped hole 16a. Further, as shown in Table 1 of FIG. 3, each data is provided with a data item No.
"1" is "Hole length", "2" is "Sewing pitch",
"3" is "number of eyelets", "4" is "flow bar length",
“5” is “flow bar length correction”. These data are stored in the RAM 33 and are stored in the chart 1 of FIG.
As shown in (1), each control data is numbered from pattern No. 1 to pattern No. 9.

The RAM 33 stores "needle drop position data" including data such as coordinates of needle drop points calculated from the control data as described later. Further, the program data stored in the ROM 31 may be read into the RAM 33 and executed.

The CPU 32 reads out one control data from the control data stored in the RAM 33 based on the input from the operation panel 7 and inputs the data for changing the control data from the operation panel 7 at the time of the overlock sewing of the eyelet hole 16. If there is, a process of rewriting the control data stored in the RAM 33 is performed. That is, data such as "flow bar length correction" included in the control data can be set, and the operation panel 7, the CPU 32, and the RAM 33 serve as setting means.

Then, from the control data stored in the RAM 33, “needle drop position data” for sewing the eyelet buttonhole stitch 19 is created by the CPU 32. As shown in FIG. 6 (a), the eyelet buttonhole stitch 19 includes a flow bar 19a at the start of sewing (a bartacking portion at the start of sewing).
The right side straight portion 19c (side stitching portion) and the left side straight portion 19
d (side stitch portion), eyelet portion 19e, sewing end flow bar 19b (sewing end flow bar stop portion) shown in FIG.
It has. Here, point O is the origin position of the XY coordinates, point A is the start point of the flow bar 19a at the start of sewing, point B is the point at the boundary between the flow bar 19a at the start of sewing and the right straight line portion 19c, and C The points D and D are the starting point and the ending point of the eyelet 19e, the point E is the point between the straight line portion 19d on the left side of the eyelet hole 16 and the sewing end flow bar 19b, and the point F is the sewing end flow bar 19b. It is the end point. The point A 'is displayed when the flow bar 19a at the sewing start is not corrected.
This is the point that becomes the starting point of a.

In creating the needle drop position data, in the first embodiment, as shown in FIG. 3B, the sewing length of the flow bar 19a at the start of sewing is set to "flow bar length". From the value, the value set in "Flow bar length correction" is subtracted as a correction amount, and data is created so that the sewing is performed in a short length. On the other hand, as shown in FIG. 3 (c), the sewing length of the flow bar 19b at the end of sewing is not corrected, and the "flow bar length" is not corrected.
The data is created so as to be sewn to the length of the value set in. Accordingly, unless the correction amount is set to "0", the sewing length of the flow bar 19a at the start of sewing and the flow bar 19a at the end of sewing
It is sewn so that the sewing length of b differs. Also, the needle drop position data is created as described above, and FIG.
As shown in the figure, the sewing start flow bar 19a and the sewing end flow bar 19b are sewn so as to overlap below the straight portion of the eyelet hole 16. Thereby, the prevention of fraying and reinforcement of the eyelet buttonhole seam 19 are sufficiently ensured. That is, CP
The U32 and the RAM 33 serve as data creation means and flow bartacking correction means.

The control data does not include a "flow bar length correction" value as a correction amount, and the flow bar 19a at the start of sewing is not provided.
And the sewing length of the flow bar 19b at the end of sewing
May be provided, and each may be set independently.

An interface 3 is provided to the CPU 32.
When a signal for instructing the start of sewing is input from a start switch 9 connected via the control unit 5, various drive mechanisms for driving the needle bar 10, looper, spreader, and the like to perform up / down, left / right, rotation, and the like are controlled. A process for performing overlocking is performed. In the above processing, the CPU 32
Although not described in detail, a process of confirming the operation of various members by various sensors provided in the sewing machine, a process of driving a presser, a process of thread trimming, and a process of controlling the driving of other members associated with overlock sewing are performed.

The CPU 32 of the control device 8 which performs the above-described processing is connected to the operation panel 7 via the interface 35 as shown in FIG. Select and change. The CPU 32 is connected to a servomotor drive circuit 36 that drives the spindle servomotor 12 via an interface 35, and controls the rotation of the spindle servomotor 12 so that a needle bar including an upper shaft and a lower shaft, a looper And the needle bar 1 through the drive mechanism of the spreader.
0, controls the operation of the looper and spreader.

The CPU 32 has an interface 3
5 are connected to pulse motor drive circuits 37 and 38 for driving the X-axis pulse motor 20 and the Y-axis pulse motor 21 provided in the feed mechanism of the feed base 17, respectively. Control directional movement. The CPU 32 is connected to the pulse motor drive circuit 39 via the interface 35,
0 and the rotation of the looper base 11 are controlled. The pulse motor drive circuit 39 drives the Z-axis pulse motor 14 that rotates the needle bar 10 and the looper base 11 in order to make the seam radial at the portion of the eyelet hole 16 in the form of the droplet 16a. The CPU 32 is connected to the X-axis origin sensor 22 and the Y-axis origin sensor 23 for detecting the origin position of the feed base 17 via the interface 35.
A signal indicating whether or not 7 has returned to the origin position is input, and control based on the signal is performed.

The CPU 32 has an interface 3
5 is connected to a Z-axis origin sensor 24 for detecting whether or not the rotation angle of the needle bar 10 and the looper base 11 is at the origin position, and the rotation angle of the needle bar 10 and the looper base 11 returns to the original position. Is input, and control based on the signal is performed. The CPU 32 is connected via an interface 35 to a cylinder drive solenoid valve 28 for driving a cloth cutting cylinder 27 for driving a movable knife of the knife mechanism.
Control the formation of

Next, an operation panel 7 for the operator to select and change control data will be described with reference to FIG. The control panel 7 includes a control data selection unit 41 for selecting one control data from a plurality of control data.
A control data changing unit 42 for changing data of each item of the selected control data; and, when the control data is set, calculating the needle drop position data based on the set control data. A preparation switch 43 is provided which is operated when the operation is performed, that is, when the CPU 32 performs an operation for preparing for sewing.

The control data selecting section 41 displays the currently selected control data by the control data display section 41a indicated by the pattern No. and the control data displayed on the control data display section 41a every time the control data is pressed. No. 1 is added to the pattern plus switch 41b to change the selected control data, and each time the switch is pressed, the control data selected by subtracting 1 from the control data No. displayed on the control data display section is selected. To change the pattern minus switch 41
c.

The control data change section 42 includes a data item display section 42a for indicating which data item of a plurality of data items in the control data is to be changed by a data item number. A data item plus switch 42b that changes the selected data item by adding 1 to the data item No. displayed on the item display section 42a.
And a data item minus switch 42c for changing the selected data item by subtracting 1 from the data item No. displayed on the data item display section 42a each time the button is pressed.

Further, the control data change section 42 stores the data of the data item corresponding to the data item No. displayed on the data item display section 42a among the control data of the pattern No. displayed on the control data display section 41a. And a data display section 42d for displaying
a data plus switch 42e for changing the value of the data by adding 1 to the lowest digit of the data displayed in d.
Each time the button is pressed, a data minus switch 42f for changing the value of the data by subtracting 1 from the lowest digit of the data displayed on the data display section 42d, and data for instructing change and update of the selected control data And a setting switch 42g.

Next, referring to the flowchart of FIG.
The processing in the CPU 32 from the setting of the control data to the cutting of the eyelet hole and the overcasting will be described. First, it is determined whether or not the pattern plus switch 41b and the pattern minus switch 41c of the operation panel 7 have been pressed (step A1), and if pressed, it corresponds to the operation of the pattern plus switch 41b and the pattern minus switch 41c. And updates the pattern No. on the control data display section 41a (step A2). Before the pattern No. is updated and when the pattern No. is not updated, the pattern No. selected in the previous overlock stitch or the default pattern No. is displayed in the control data display section 41a. Is displayed. Further, the changed pattern No. or the pattern No.
The state is stored in M33.

Next, when the pattern plus switch 41b and the pattern minus switch 41c are not pressed or when the pattern No. is updated as described above, it is determined whether or not the data setting switch 42g is pressed (step A3). If the data setting switch 42g is pressed, a data setting process (data changing process) described later is performed (step A4). That is, a process of changing one or more data items of a plurality of data items included in one control data selected from the plurality of control data stored in the RAM 33 is performed. Next, in a state where the data setting switch 42g is not pressed or when the data setting process is completed, it is determined whether or not the preparation switch 43 is pressed (step A5). If the button is not pressed, the process returns to step A1.

That is, until the preparation switch 43 is pressed, the pattern No. can be changed at any time by pressing the pattern plus switch 41b and the pattern minus switch 41c, and by pressing the data setting switch, the pattern No. can be changed. It is possible to change the data of an arbitrary data item in one of the control data shown. Then, by pressing the preparation switch 43, the process of selecting one control data from a plurality of control data stored in advance and the process of changing data in the selected control data are completed.

When the preparation switch 43 is pressed as described above, the control data is determined, and the determined control data is stored in the RAM 33.

Then, based on the determined control data, "needle drop position data" for sewing the eyelet buttonhole stitch 19 is created (step A6). As shown in FIG. 6, the needle drop position data is calculated as follows in order to sew the eyelet buttonhole stitch 19 on the previously registered female shape indicated by the solid line. In other words, as shown in FIG. 6 (a), for the portion of the flow bar 19a at the sewing start (from point A to point B), the sewing length in the Y-axis direction of this portion after correction (= “flow bar length”) "-
By dividing the “flow bar length correction” value by the “sewing pitch” value, the Y coordinate (position in the Y-axis direction from the origin O) of each needle drop point is calculated. Then, for the calculated Y coordinate, the X coordinate from the point A to the point B (the position in the X-axis direction from the origin O) is calculated. Similarly, the sewing length from the point B to the point C, the sewing length from the point D to the point E, and the sewing length from the point E to the point F (that is, a flow bar 19b at the end of sewing).
XY coordinates are calculated from. Further, the XY coordinates of the arc-shaped portion of the eyelet 19e from the point C to the point D are calculated by equally dividing the arc on the basis of the “number of eyelet stitches” value. FIG.
Here, for simplification of the drawing, only the Y coordinate of the needle drop point inside the eyelet hole 16 among the needle drop positions calculated from the “sewing pitch” value is indicated by a black point.

The rotation angle (Z-turn amount) at each position of the needle bar 10 and the looper base 11 is A in FIG.
The point C is set to 0 degree from the point, the point D to the point F is set to 180 degrees, and from the point C corresponding to the eyelet 19e to the point D,
An angle obtained by equally dividing 180 degrees by the “number of eyelet stitches” value is defined as a rotation angle. By calculating the difference between the XY coordinates of each needle drop point and the rotation angles of the needle bar 10 and the looper base 11 thus determined, and the Z rotation angle of each needle drop point, each needle drop point is calculated. XY movement amount between points and Z
The turning amount is obtained, and as shown in FIG. 7, the turning amount is collected in the data table T and stored in the RAM 33 as the X moving amount, the Y moving amount, and the Z turning amount.

Next, the feed bar 17 is moved to the origin position, and the needle bar 10 and the looper base 11 are rotated and moved to the origin position (origin angle) (step A7). And
It is determined whether or not the start switch 9 is turned on (step A8). That is, the system is in a standby state until the start switch 9 is pressed. Then, when the start switch 9 is pressed, the eyelet hole 16 is formed before the overlock sewing by driving the knife mechanism (step A9).

Then, the feed table 17 is moved to the sewing start position (step A10). Then, the needle bar 10, the looper, the spreader, the feed base 17 and the like are driven to perform the eyelet buttonhole sewing operation (step A11). Next, after the overlock stitching is completed, the feed base 17 is returned to the home position, and the rotation angles of the needle bar 10 and the looper base 11 are returned to the home position (step A12). Then, step A8
When the start switch 9 is pressed, the above-described operation is repeated to perform the next eyelet buttonhole sewing.

Next, referring to the flowchart of FIG.
The above-described data setting process will be described. In step A3 of the flowchart in FIG. 8, the data setting switch 42g
Is pressed, the control data corresponding to the pattern No. displayed on the control data display section 41a at that time is read out to the RAM 33. Then, in the data setting process, the data item No. is set to 1 as a default value (step B1), and this data item No. is displayed on the data item display section 42a. Then, the data of the data item No. 1 is read and displayed on the data display section 42d.

In this state, the data plus switch 42e
Alternatively, it is determined whether or not the data minus switch 42f is operated (step B2), and when it is operated, the data stored in the RAM 33 is rewritten based on the operation of the switch (step B3). At this time, the display of the data display section 42d is also changed. Also,
In rewriting data, as described above, the data plus switch 42e or the data minus switch 4
Each time 2f is pressed, the last digit of the data is added or subtracted by "1". Next, it is determined whether the data plus switch 42e or the data minus switch 42f is not operated or whether the data item plus switch 42b or the data item minus switch 42c is operated when the data is rewritten (step B).
4) When the operation is performed, the data item No. is updated. At this time, the displays on the data item display section 42a and the data display section 42d are also changed (step B5).

Then, the data item plus switch 42b
Alternatively, it is determined whether the data setting switch 42g is pressed after the data item minus switch 42c is not operated or after the data item No. is changed (step B6), and if the data setting switch 42g is pressed, Ends the data update and sets the data in a determined state (step B7), and proceeds to the processing of step A5 of the above-described processing. If the data setting switch 42g is not pressed, the process returns to step B2. If the data item No. has been updated, the updated data item No.
Can be changed, and data item No.
Is not updated, the data of the same data item No. as before can be changed.

That is, in the data setting process, the data of the arbitrary data item No. can be changed by arbitrarily changing the data item No. until the data setting switch 42g is pressed again. According to the above-described sewing machine control device, an overlock pattern is determined only by selecting one control data from a plurality of control data stored in advance. Therefore, the operation of the sewing machine can be facilitated, and the control data setting process in the control device can be facilitated.

In the above example, the needle drop position data is created by assuming that the feed base 17 is moved in the X-axis direction and the Y-axis direction. However, the feed base 17 is moved in the radial direction ( The needle drop position data can be created in substantially the same manner by combining the linear movement in the (r direction) and the movement in the arc direction at the angle θ.

Based on the control data set as described above, needle drop position data is created in step A6 of FIG. 8 as described above. Based on the created needle drop position data, the control means such as the CPU 32 controls the above-mentioned sewing means to sew the eyelet buttonhole seam 19, so that the sewing start flow bar 19a and the sewing end flow The eyelet buttonhole stitch 19 is sewn such that the bar 19b is different.

According to the control device of the first embodiment, by setting "flow bar length correction" in addition to "flow bar length" setting, the sewing start flow bar 19a and the sewing end flow are set. By making the length different from the length of the bar 19b, sewing can be performed with less overlap between the two, and it is possible to perform an eye-catching buttonhole stitching with less stiffness and good appearance.

[Second Embodiment] A control device for a sewing machine according to a second embodiment of the present invention will be described below with reference to the drawings. The control device for the sewing machine of the second embodiment
This is a modification of the embodiment of the present invention, and is different from the item set as the control data and the process for correcting the “flow bar length” based on the control data. Other configurations are
Basically, it is the same as the first embodiment, and in the following description, the points different from the first embodiment will be mainly described.

In the second embodiment, the control data is a set of the following six data. That is, FIG.
As shown in FIG. 0 (a), the “hole length” indicated by an arrow “a” and the “number of straight needles” of the eyelet hole 16 indicated by an arrow “b”
"The number of eyelets in the eyelet" indicated by arrow c, the "length of the flow bar" indicated by arrow d, the "number of flow bar needles" indicated by arrow e, and the "flow bar needle" indicated by arrow f. Number correction "(flow bartacking correction data). That is, a set of these six items of data is one control data. That is, in the second embodiment, the correction amount of the flow bar portion is given by the number of stitches as indicated by the “flow bar stitch number correction” value. Then, based on the "flow bar number of stitches correction" value, sewing is performed so that the length of the flow bar 19a at the start of sewing is shortened, and the sewing length of the flow bar 19a at the start of sewing and the sewing length of the flow bar 19b at the end of sewing are obtained. Are sewn differently. As shown in Table 1 of FIG. 10, each data is provided with a data item No., where “1” is “hole length”, “2” is “number of stitches in a straight portion”, “ “3” is “number of eyelets”, “4” is “length of flow bar”, “5” is “number of flow bar stitches”, and “6” is “correction of flow bar number”.
These data are stored in the RAM 33, and as shown in Table 1 of FIG. 12, each control data is given a number from pattern No. 1 to pattern No. 9.

In the second embodiment, by setting the control data to the six items, the "needle drop position data" of step A6 in the flowchart of FIG. 8 is created as follows. That is, in the portion of the flow bar 19a at the start of sewing, first, in FIG. 6 (a), from the point A (the start point when no correction is made to the flow bar 19a at the start of sewing),
The portion up to the point is equally divided by the value of the “flow bar number”, and the Y coordinate of each needle drop point when no correction is made (Y from the origin O)
(Axial position). Then, from the point A side, except for the needle drop points only indicated by the “flow bar number correction” value, the remaining needle drop points (portions from point A to point B) are calculated with respect to the calculated Y coordinate. Calculate the X coordinate.
For the part of the flow bar 19b at the end of sewing, the part from the point E to the point F is equally divided by the "number of flow bar stitches" value to calculate the Y coordinate of each needle drop point. hand,
The X coordinate is calculated in the same manner as described above. Similarly, with respect to the portion from the point B to the point C and the portion from the point D to the point E, the Y coordinate of each needle drop point is calculated by equally dividing the “linear portion stitch number” value, An X coordinate is calculated for the Y coordinate. The portion of the eyelet 19e from the point C to the point D is equally divided on the arc by the value of the “number of eyelet stitches” to calculate the XY coordinates.

Hereinafter, a data setting process according to the second embodiment will be described with reference to FIG. The data setting process of the second embodiment is basically the same as that of the first embodiment (shown in FIG. 9) except that the control data consists of the above six data.
Is the same as That is, in step A3 of the flowchart of FIG. 8, the data setting switch 42g is pressed to enter the data setting state, and the data item display section 42a sets the data item No. to 1 as a default value (step C1). Then, the data of the data item No. 1 is read and displayed on the data display section 42d.

In this state, the data plus switch 42e
Alternatively, the operation of the data minus switch 42f is determined (step C2). When the operation is performed, the data stored in the RAM 33 is rewritten (step C3), and the display of the data display section 42d is changed. Next, the data plus switch 42e or the data minus switch 4
In a state where 2f is not operated or when the data is rewritten, the operation of the data item plus switch 42b or the data item minus switch 42c is determined (step C4), and if operated, the data item No. is updated. At this time, the displays of the data item display section 42a and the data display section 42d are also changed (step C5).

Then, the data item plus switch 42b
Alternatively, after the data item No. switch 42c is not operated or the data item No. is updated, the operation of the data setting switch 42g is determined (step C6), and when the data setting switch 42g is pressed, the data After the update is completed, the data is determined (step C7), and the process proceeds to step A5 of the above process. If the data setting switch 42g is not pressed, the process returns to step C2. Then, similarly to the first embodiment, needle drop position data is created based on the control data set as described above, and based on the created needle drop position data, sewing start flow bar 19a and sewing are performed. The eyelet buttonhole seam 19 is sewn so that the end flow bar 19b is different.

According to the control device for a sewing machine of the second embodiment described above, in addition to the setting of "flow bar length" and "flow bar stitch number", "flow bar stitch number correction" is set. Similarly to the first embodiment, it is possible to perform an eye-catching buttonhole stitching with less stiffness and good appearance.

The present invention is not limited to the above embodiment. For example, in this embodiment, the buttonhole buttonhole is sewn. However, it is needless to say that the present invention is applicable to other buttonholes such as a sleeping hole. Further, the control device 8 and the like are not limited to the configuration described in the present embodiment, and can be configured with various logic circuits. In addition, it is needless to say that the present invention can be appropriately changed without departing from the spirit of the present invention.

[0061]

According to the first aspect of the present invention, the sewing length of the bar-tacking portion at the start of sewing and the sewing length of the bar-tacking portion at the end of sewing are made different from each other, thereby suppressing a feeling of stiffness and giving a good appearance. Sewing can be applied.

According to the second aspect of the invention, the same effects as those of the first aspect can be obtained.

According to the third aspect of the invention, the same effects as those of the first or second aspect can be obtained, and the flow bartacking correction data can be arbitrarily changed, and the sewing of the bartacking portion at the start of sewing can be performed. The length and the sewing length of the bar-tacking portion at the end of sewing can be adjusted as desired so as to be different.

According to the invention set forth in claim 4, claims 1 to 1 are provided.
In addition to providing the same effect as any one of No. 3, it is possible to provide a good-looking overlock seam while suppressing stiffness.

[Brief description of the drawings]

FIG. 1 is a side view of a sewing machine 1 to which a control device 8 according to an embodiment of the present invention is applied, which is partially cut away.

FIG. 2 is a block diagram for explaining a control device 8 of the sewing machine 1 of FIG.

FIG. 3 is a diagram showing an eyelet hole buttoning seam 19 together with a table showing the contents of control data according to the first embodiment.

FIG. 4 is a block diagram showing the RO of the control device 8 according to the first embodiment;
It is a drawing showing a memory area of control data stored in M31.

FIG. 5 is a front view showing the operation panel 7.

FIG. 6 is a drawing of the eyelet buttonhole stitch 19 for explaining the needle drop position data stored in the RAM 33.

FIG. 7 is a diagram showing a data table T of needle drop position data.

FIG. 8 is a flowchart for explaining processing of the control device 8;

FIG. 9 is a flowchart illustrating a data setting process according to the first embodiment.

FIG. 10 is a diagram showing an eyelet hole buttoning seam 19 together with a table showing the contents of control data according to the second embodiment.

FIG. 11 is a flowchart illustrating a data setting process according to the second embodiment.

FIG. 12 is a block diagram of a control device 8 according to a second embodiment;
3 is a diagram illustrating a memory area of control data stored in an OM 31.

[Explanation of symbols]

1 sewing machine 7 operation panel (part of setting means) 10 needle bar 10 (part of sewing means) 12 spindle servomotor (part of sewing means) 14 Z-axis pulse motor (part of sewing means) 17 feed stand ( 18 Part of sewing means 18 Foot part of sewing means (Part of sewing means) 19 Eyelet overhole seam (Overlock seam) 19a Flow bar at the start of sewing (taper bar at the beginning of sewing) 19b Flow bar at the end of sewing (bar bar at the end of sewing) 19c Right linear portion (part of side sewing portion) 19d Left linear portion (part of side sewing portion) 20 X-axis pulse motor (part of sewing means) 21 Y-axis pulse motor (part of sewing means) 31 ROM (part of control means) 32 CPU (part of control means, part of data creation means) (part of flow bartacking correction means, part of setting means) 33 RAM (part of control means) , Storage means, data creator Part of) (a part of the flow bar tack correction means, a part of the setting means)

Claims (4)

[Claims] 1. A left and right side stitch portion, a sewing start bartacking portion formed prior to the sewing of one side stitching portion, and a sewing end flow barta formed after finishing the sewing of the other side stitching portion. A sewing machine control device having a sewing means for applying an overlock stitch to a workpiece to be sewn, such as a button hole, provided with a stop portion, wherein a sewing length of the sewing start flow bar and a sewing bar of the sewing end flow bar are provided. A control device for a sewing machine, comprising: control means for controlling said sewing means so as to form an overlock stitch having a sewing length different from that of a stop portion. 2. A control device for a sewing machine according to claim 1, wherein a storage means for storing control data indicating a sewing pattern of an overlock stitch; a data generating means for generating needle drop position data based on said control data; Wherein the control data includes flow bartacking correction data which is a correction amount of the sewing length of either the sewing start flow bartacking portion or the sewing end flow bartacking portion. The flow of correcting the needle entry position data of the flow bar-tacking portion based on the stitch length of the flow bar-tacking portion at the start of sewing and the stitch length of the flow bar-tacking portion at the end of sewing to form an overlock stitch. A control device for a sewing machine, comprising: a bar-tack correcting means, wherein the control means performs overlock stitching based on the needle entry position data corrected by the flow bar-tack correcting means. 3. The control device for a sewing machine according to claim 1, further comprising: setting means for setting a value of the flow bartacking correction data. 4. A sewing machine sewing method comprising the sewing machine control device according to claim 1, wherein the control means controls the sewing means so that the sewing start flow bar is controlled. A sewing method for a sewing machine, comprising forming an overlock stitch in which a sewing length of a stop portion is different from a sewing length of the flow-end bar-tacking portion.