JPH0234630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a programming device for an electronic sewing machine that automatically performs sewing based on a preset program.

[Prior Art] Conventionally, in order to sew an arcuate pattern with an industrial electronic sewing machine, it was necessary to input the needle position based on the pattern into a programming device for each stitch to create a stitch formation command. . However, when creating a stitch formation command for a pattern with a large number of stitches using such a programming device, it requires a lot of time and effort to input the needle position for each stitch, and furthermore, it requires a lot of time and effort to input the needle position for each stitch. In order to sew neatly, it is necessary to accurately input the needle position of each stitch along the arc pattern and to set the stitch pitch small, making the task of creating stitch formation commands extremely complicated.

[Objective] The present invention solves the above-mentioned drawbacks of the conventional example, and provides a sewing machine that can easily create arc pattern stitch formation commands and easily sew a smooth arc pattern along a desired arc. to provide programming equipment.

[Example] The configuration of a sewing machine embodying the present invention will be described below with reference to the drawings.

In FIG. 1, a sewing machine frame 2 placed on a table 1 includes a pedestal 2a and a bracket arm 2b extending forward from the pedestal 2a. A needle bar 4 having a sewing needle 3 at its lower end and a presser bar (both not shown) having a presser foot at its lower end are mounted on the head of the bracket arm 2b so as to be movable up and down. A DC motor 5 for driving the sewing machine is attached to the section, and it moves up and down the needle bar 4 and a presser bar for an intermittent presser foot to prevent the fabric from lifting around the sewing needles 3. ing. A needle position detection device 6 attached to the rear side of the DC motor 5 detects the rotating position of the drive shaft of the DC motor 5, and detects when the sewing needle 3 is at a predetermined needle position (e.g., needle down position, needle up position, etc.). It is designed to output a detection signal when the

A workpiece support bed 7 is provided at the center front side of the table 1, and on the workpiece support bed 7, a holding device 8 serving as a workpiece holding means moves horizontally across the reciprocating path of the needle 3. Possibly supported. Then, the needle 3 and the workpiece support bed 7
A seam is formed in the workpiece cloth held by the workpiece holding device 8 by cooperation with a thread ring catcher (not shown) provided therein.

Next, the structure of the workpiece holding device 8 will be explained. A cloth holding frame 9 is provided on the workpiece support bed 7, and the rear side of the cloth holding frame 9 is arranged in the left-right direction (X direction) and A feeding frame 10 supported movably in the front-rear direction (Y direction) is fixed.

The connecting rod 11 is supported so as to be movable only in the left-right direction, and supports both sides of the feed frame 10 by guide rollers 12 so as to be movable only in the front-back direction, and a rack 13 is connected and fixed to the right end thereof. ing. The X-axis pulse motor 14 is arranged such that a pinion 15 fixed to its drive shaft meshes with the rack 13, and when the motor 14 is rotated in the normal direction, the feed frame is moved through the rack 13 and the connecting rod 11. 10 to the left (+X direction) or reversely, the feed frame 10 is moved to the right (-X direction).

The connecting frame 16 is supported so as to be movable only in the front-back direction, and the rear side of the feed frame 10 is supported by guide rollers 17 so as to be movable only in the left-right direction, and a rack 18 is connected and fixed to the rear side. ing.
The Y-axis pulse motor 19 is arranged such that a pinion 20 fixed to its drive shaft meshes with the rack 18, and when the motor 19 is rotated in the normal direction, the feed frame is moved through the rack 18 and the connecting frame 16. 10 in the rearward direction (-Y direction), and by being reversed, the feeding frame 10 is moved in the forward direction (+Y direction). Therefore, this X and Y axis pulse motor 1
The cloth holding frame 9 is moved in the left-right and front-back directions by the forward and reverse rotations of 4 and 19, and all positions within the frame 9 are guided to the needle drop position.

The support stand 21 is fixedly installed on the feed frame 10, and the rotating arm 22 is rotatably attached by a support pin 23. The base end of the rotating arm 22 is 2
It is connected to a presser drive motor 25 via a main wire 24, and when the motor 25 is rotated in the normal direction, the rotating arm 22 is moved upward via the wire 24, and when it is rotated in the reverse direction, the rotating arm 22 is rotated. Moving arm 22
It is designed to rotate downward. Presser frame 2
6 is fixed to the tip of the rotating arm 22, and its frame shape is the same as the cloth holding frame 9. Then, when the rotating arm 22 is rotated downward,
The presser frame 26 cooperates with the cloth holding frame 9 to clamp the work cloth.

Next, the electric circuit of the programming device provided in the sewing machine will be explained.

In FIG. 1, the X-axis origin limit switch 31 is disposed near the reciprocating path of the rack 13, and when the X-axis pulse motor 14 moves the rack 13 to the right, the When the left inner edge reaches the needle drop position, the movable piece of the switch 31 engages with the rack 13 and outputs an on signal. The Y-axis origin limit switch 32 is disposed near the reciprocating path of the rack 18, and when the Y-axis pulse motor 19 moves the rack 18 forward, the rear inner edge of the cloth holding frame 9 is moved. When the needle reaches the needle drop position, the movable piece of the switch 32 moves to the easy 1 position.
8 and outputs an on signal. The numeric keys 33 from "0" to "9" used as stitch pitch setting means are automatic return type switches, and are operated by a program operation case (not shown) provided in the sewing machine.
The number keys 33 are provided in the number keys 33 and are used to set the pitch of the stitches to be sewn, and by pressing each of the numeric keys 33, a code signal corresponding to the pressed key 33 is output.

X-axis and Y-axis jog keys 34, 35, 36,
Reference numeral 37 is an automatic return type switch, which is also provided in the operation case, and by pressing one of the X-axis jog keys 34, the workpiece holding device 8 can be moved to the left in FIG. By pressing the other X-axis jog key 35, a pulse signal for moving the holding device 8 to the right is output. Also, a pulse signal is sent to move the holding device 8 backward by pressing one Y-axis jog key 36, and to move the holding device 8 forward by pressing the other Y-axis jog key 37. Output.

The program key 38 is also an automatic return type switch provided in the operation case, and is used to start creating a stitch formation command for sewing a curved pattern including circular arcs, and when the program key 38 is pressed. This outputs an on signal. The load key 39 is also an automatic return type switch and is provided in the operation case, and by pressing this, each sewing point (to be described later) is selected based on the operation of the X-axis and Y-axis jog keys 34 to 37. An on signal for storing the coordinate position data of Q ₁ to Qn in the coordinate memory 43 is output. This load key 39 and the jog keys 34 to 37 constitute a main coordinate position data reading means.

The curved seam formation command creation key 40 is also an automatic return type switch and is provided in the operation case, for example, when recording paper 4 as a recording medium shown in FIG.
When attempting to sew the curved pattern 47a recorded in FIG. 7, the curved pattern 47a shown in _FIG . This is used when reading the coordinate positions of each sewing point _Q1 to Qn to be divided and creating a stitch forming command that approximates each sewing point with an arc based on the coordinate position data. A based on signal is output to the control circuit 41.

A control circuit 41 serving as a control means receives ON signals and code signals from the limit switches and keys 31 to 40, and based on these signals, controls the workpiece holding the recording paper 47 as shown in FIG. The holding device 8 is moved and each sewing point is
The operation of reading the coordinate position data of Q ₁ to Qn, and each sewing point Q ₁ based on the read coordinate position data.
- Qn is approximated by a circular arc to create a stitch forming command for each stitch, and the operation of the sewing machine is controlled based on each of the created commands.

The working memory 42 is a random access memory, and as shown in FIG.
An area for storing the number of steps X of the X-axis pulse motor 14 (the amount of horizontal movement of the workpiece holding device 8) based on the operation of the keys 34 and 35, and a Y-axis based on the operation of the Y-axis jog keys 36 and 37. Pulse motor 19
area for storing the number of steps Y (amount of movement of the workpiece holding device 8 in the front-rear direction), the rotation direction of the X-axis and Y-axis pulse motors 14, 19 (the left-right and front-back movement directions of the workpiece holding device 8) Area for storing SYM,
An area for storing the stitch pitch PITCH set by the operation of the numerical keys 33, an area for storing the content SMOOTH for determining whether or not the curved stitch formation command key 40 has been operated, and a coordinate memory to be described later. It has an area for storing address ADR.

Coordinate memory 4 as coordinate position data storage means
Numeral 3 is also a random access memory in which coordinate position data of each sewing point Q ₁ -Qn is sequentially stored at a predetermined address.

The sewing command memory 44 as a stitch forming command storage means is also a random access memory, and
Stitch formation commands for each stitch for forming the curved pattern 47a are sequentially stored in each address. This stitch formation command is composed of the number of steps and rotation direction of the X-axis and Y-axis pulse motors 14 and 19 for each stitch.

The display device 45 includes a three-digit, seven-segment type display section provided on the operation case, and a numerical value corresponding to the operation of the number key 33 is displayed on the display section.

The pulse motor drive circuit 46 drives the X-axis and Y-axis pulse motors 14 and 19 step by step in a predetermined rotation direction by a predetermined amount based on the drive control signal output from the control circuit 41.

Next, we will explain the operation of the sewing machine configured as above in the second section.
The explanation will be made according to the flowchart of the control circuit 41 shown in FIGS.

Now, when the power switch (not shown) of the sewing machine is turned on, the control circuit 41 operates according to the flowchart shown in FIG.
The system waits for the various keys 33 to 40 to be operated.
Here, the curved pattern 47a recorded on the recording paper 47
When the program key 38 is turned on after holding the recording paper 47 in the workpiece holding device 8 in order to program sewing commands, the control circuit 4
1, according to the flowchart shown in FIG. 3, the pulse motor drive circuit 45 is set so that the workpiece holding device 8 is at the absolute origin (the position where the back left corner of the cloth holding frame 9 is at the needle drop position) AHP. A drive control signal is output, and the X-axis and Y-axis pulse motors 14 and 19 are controlled in steps. Then, the holding device 8 is the absolute origin.
When moved to AHP, both the X-axis and Y-axis origin limit switches 31 and 32 are turned on,
Based on the signal, the control circuit 41 outputs a drive control signal to stop the holding device 8, clears the contents of the working memory 42, and waits for the next key operation.

Next, by appropriately operating the X-axis and Y-axis jog keys 34 to 37, the holding device 8 is moved so that the sewing starting point _Q1 on the curved pattern 47a of the recording paper 47 corresponds to the needle drop position. , the control circuit 41 controls the X-axis and Y-axis pulse motors 14,
19, and step both pulse motors 14 and 19, and determine the number of steps X, Y and rotation direction of each motor 14 and 19 at that time.
After storing SYM in a predetermined area of the working memory 42, it waits for the load key 39 to be operated.

When the load key 39 is turned on, the control circuit 4
1 first determines whether or not the SMOOTH area of the working memory 42 is 1 according to the flowchart shown in FIG. Now, since this SMOOTH area is 0, the control circuit 41 next uses the working memory 42.
The data of each area of X, Y, SYM is the sewing starting point Q ₁
Since the data of the sewing start point Q ₁ is currently stored, the control circuit 41 sets the coordinate position data XQ 1 , YQ ₁ in the XY coordinates of the sewing start point Q ₁ based on the _data . is calculated and stored at a predetermined address in the coordinate memory 43, and at the same time creates a stitch formation command for the sewing start point _Q1 ,
After storing the sewing command at a predetermined address in the sewing command memory 44, operation of the numeric key 33 is awaited.

Next, when the stitch pitch for sewing the curved pattern 47a is set by operating the numerical keys 33 according to FIG. 2, the control circuit 41 displays the set pitch on the display device 45 as shown in FIG. After that, wait for the next key operation.

Then, when the curved stitch formation command creation key 40 is pressed next, the control circuit 41 stores the stitch pitch displayed on the display device 45 in the PITCH area of the working memory 42, as shown in FIG. Furthermore, after inputting 1 into the SMOOTH area of the working memory 42, the CPU waits for the next key operation.

Here, the jog keys 34 to 34 are set so that the needle drop position corresponds to a sewing point _Q2 on the curved pattern 47a of the recording paper 47, which is spaced apart from the sewing start point _Q1 by a distance larger than an appropriately set stitch pitch. 37 to move the holding device 8, the control circuit 41 moves from the sewing start point Q1 to the sewing point _Q1 according to FIG.
X-axis and Y-axis pulse motor 14 up to Q ₂ ,
19 are stored in a predetermined area of the working memory 42.

Then, when the load key 39 is pressed, the seventh
As shown in the figure, the control circuit 41 first determines whether the SMOOTH area of the working memory 42 is 1 or not. Now, since the SMOOTH area is 1, the control circuit 41 controls the working memory 42's X,
Sewing points stored in each area of Y and SYM
Based on the data of sewing point _{Q 2 ,} coordinate position data XQ ₂ and YQ ₂ in the XY coordinates of this sewing point Q 2 are calculated, and the data is stored in the coordinate memory 43 at an address following the address where the data of the sewing point Q ₁ is stored. Store in.

Subsequently, the control circuit 41 displays 789 on the display device 45.
Determine whether or not is displayed. Since the stitch pitch is now displayed on the display device 45, the control circuit 41 is in a state of waiting for the next key operation.

Next, as in the case of sewing point Q ₂ , set the sewing point
When the jog keys 34 to 37 are selectively operated to move the holding device 8 so that the needle drop position corresponds to the sewing point Q ₃ which is spaced apart from the stitch pitch set from Q ₂ , the control circuit 41 stores the rotation direction and amount of rotation of both pulse motors 14 and 19 from sewing point Q ₁ to Q ₃ (linear distance) in a predetermined area of working memory 42.

Then, when the load key 39 is pressed, the control circuit 41 selects the sewing point Q ₃ based on the data of the sewing point Q ₃ stored in the working memory 42.
Coordinate position data XQ ₃ and YQ ₃ in the XY coordinates are calculated and stored at a predetermined address in the coordinate memory 43.

In this way, each sewing point Q ₄ to
Qn is sequentially stored in the coordinate memory 43. and,
After aligning the needle drop position with the sewing end point Qn of the curved pattern 47a, operate the number keys 33 to display 789 on the display device 45, and then press the load key 3.
When 9 is pressed, the control circuit 4 is activated as shown in FIG.
1 stores the coordinate position data of the sewing end point Qn in the coordinate memory 43, then determines the number "789" displayed on the display device 45, and calculates the coordinate position data for each stitch from the coordinate position data stored in the coordinate memory 43. The operation of creating sewing commands and sequentially storing them in the sewing command memory 44 is started.

The operation of the control circuit 41 will be explained with reference to FIG.
The start address of the coordinate memory 43, ie, the address where the coordinate position data of the sewing start point _Q1 is stored, is set in the ADR area. Continuing,
The control circuit 41 reads the coordinate position data of the three points, that is, the sewing start point Q ₁ , the sewing points Q 2 and Q 3 based on the address of the coordinate memory 43 set in the working memory 42, and reads out the coordinate position data of the sewing start point Q 1 , sewing points Q ₂ and Q ₃ as shown in FIG. Find the radius R ₁ and the coordinates of the center C ₁ of a circle passing through these three points Q ₁ , Q ₂ , and Q ₃ .

Then, from the stitch pitch and radius R ₁ stored in the PITCH area of the working memory 42, the minute rotation angle θ ₁ is approximated by PITCH/R ₁ . and,
Divide the section Q ₁ to Q ₂ of the arc of radius R ₁ passing through Q ₁ , Q ₂ , and Q ₃ by this rotation angle θ, and calculate the division position, that is, the stitch length of each stitch in the section Q ₁ to Q ₂ . Determine position P. Each needle position P is stored in the sewing command memory 44 as the amount of change in coordinate position from the previous needle position P, that is, as a stitch formation command.

When the storage of the stitch forming command for one section from Q ₁ to _{Q 2} is completed, the control circuit 41 sets the address of the coordinate memory 43 stored in the ADR area of the working memory 42 to 1, as shown in FIG. Based on this, select the three sewing points Q ₂ from below this address.
Read the coordinate position data of Q ₃ and Q ₄ respectively,
The radius R ₂ and center C ₂ of the circle passing through these three points Q ₂ , Q ₃ , Q ₄
seek.

Then, calculate the minute rotation angle θ ₂ from the seam pitch and radius R ₂ by approximating it by PITCH/R ₂ , and calculate the section Q ₂ to _{Q 3} of the arc with center C ₂ and radius R ₂ using this rotation angle θ _2. The divided position is determined as the needle position P for each stitch in the same way as above, and the determined needle position P
The sewing commands are sequentially obtained based on the sewing commands and stored in the sewing command memory 44 in sequence. In this manner, the control circuit 41 calculates the needle position P for each stitch up to the sewing end point Qn of the curved pattern 47a, and stores the stitch formation command at the needle position P in the sewing command memory 44.

When the needle position P for the entire section from the sewing start point _Q1 to the sewing end point Qn is stored in the sewing command memory 44, the control circuit 41 stores the working memory 4 as shown in FIG.
Clear each of the X, Y, SYM, and SMOOTH areas in step 2 to complete all sewing command creation operations for the curved pattern 47a.

If the sewing machine is operated based on a large number of sewing commands stored in the sewing command memory 44,
The workpiece holding device is moved based on the sewing command, and the sewing starting point of the curved pattern 47a is placed on the workpiece cloth.
A smooth curved pattern is formed in which each section from Q ₁ to the sewing start point Qn is approximated by a circular arc. In addition, the sewing points read out to calculate the arc that approximates each section are, for example, when calculating the section _{Q 1 to} Q 2, Q _{1 , Q 2 ,} Q ₃ , Q ₂ to Q 2 are calculated. Sometimes, Q ₂ , Q ₃ , and Q ₄ are read out in duplicate, so that an arc approximating each section is smoothly and continuously formed at each sewing point Q ₂ to Qn- ₁ .

In this way, in this embodiment, by simply reading the coordinate position data of the sewing points Q ₁ to Qn, which are spaced apart from each other by a distance larger than the stitch pitch on the curved pattern 47a recorded on the recording paper 47, the curved pattern 47a can be adjusted to the curved pattern 47a. It is possible to create a stitch formation command that can automatically sew a similar pattern.

Therefore, creating stitch formation commands becomes easy, improving work efficiency, and since the seam formation commands for each stitch are formed at positions along circular arcs, very clean curves can be created. A pattern can be formed.

In addition, in this embodiment, the curved stitch formation command creation key 4
If step 0 is omitted, it is also possible to manually create a stitch forming command for each stitch according to each flowchart except for FIGS. 6 and 8.

[Effects of the Invention] As described in detail above, the present invention sequentially reads the coordinate position data of three points defining an interval larger than the set stitch pitch, and calculates the coordinate position data of the three points based on the data. One circular arc passing through the point is determined, and a stitch forming command is created that causes relative movement between the needle and the workpiece holding means approximately every stitch pitch along the circular arc. In order to sew one circular arc, it is only necessary to read the coordinate position data of three points, and it is possible to create a sewing command in a short time. Furthermore, the smaller the stitch pitch is set by the stitch pitch setting means, the smoother the arc pattern will be. Even at this time, the number of coordinate position data to be read does not change, so the sewing commands are faster than in the past. The creation work can be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of a sewing machine including an electric control circuit according to an embodiment of the present invention, and FIGS.
The figure is a flowchart showing the arithmetic processing operation of the control circuit, Figure 9 is a perspective view of the recording medium, Figure 10 is a stitch pattern diagram for explaining the present invention, and Figure 11 is the storage contents of the working memory. FIG. In the figure, 2 is a sewing machine frame, 3 is a sewing needle, 5 is a DC motor, 7 is a workpiece support bed, 8 is a workpiece holding device, 14 is an X-axis pulse motor, 19 is a Y-axis pulse motor, 33 is a numeric key, 34 and 35 are X-axis jog keys, 36 and 37 are Y-axis jog keys,
38 is a program key, 39 is a load key,
40 is a curved stitch formation command generation key, 41 is a control circuit, 42 is a working memory, 43 is a coordinate memory, 4
4 is a sewing command memory, and 46 is a pulse motor drive circuit.

Claims (1)

[Claims] 1. A programming device for a sewing machine that causes relative movement between a needle and a workpiece holding means to form continuous stitches in accordance with a large number of stitch formation commands, comprising: Stitch pitch setting means for setting the pitch of the stitches to be sewn; and coordinate position data of three points that define an interval larger than the pitch set by the stitch pitch setting means. a reading means for reading; a coordinate position data storage means for storing the coordinate position data read by the reading means; reading out the three coordinate position data from the coordinate position data storage means; One circular arc passing through the three points indicated by the coordinate position data is determined, and the stitches cause the relative movement along the circular arc at approximately set intervals set by the stitch pitch setting means. 1. A programming device for a sewing machine, comprising: a control means for creating a seam formation command; and a seam formation command storage means for storing the seam formation command created by the control means.