JPS6346195A - programming device for sewing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 arc pattern on 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 counts using such a programming device, -
It takes a lot of time and effort to input the needle position for each needle, and in order to sew the desired arc pattern neatly, it is necessary to accurately input the needle position for each needle along the arc pattern and at the stitch pitch. It is necessary to set and input a small value,
The work of creating this seam formation command was extremely complicated and rare.

[Objective] The present invention eliminates the drawbacks of the conventional example as described above, and provides a sewing machine that can easily create a seam formation command for an arc pattern and easily sew a smooth arc pattern along a desired arc. to provide programming equipment.

[Embodiment] The structure 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. The head of the bracket arm 2b is equipped with 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 so as to be movable up and down. A DC motor 5 for driving the sewing machine is attached to the section, and is adapted to move up and down the needle bar 4 and a presser bar for an intermittent presser to prevent the cloth from lifting around the sewing needle 3. ing. A needle position detection device 6 attached to the return side of the DC motor 5 detects the rotational position of the drive shaft of the DC motor 5,
When the sewing needle 3 reaches a predetermined needle position (eg, needle down position, needle up position, etc.), a detection signal is output.

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 as a workpiece holding means is movable horizontally across the reciprocating path of the needle 3. is supported by. Then, a seam is formed on the workpiece cloth held by the workpiece holding device 8 by the cooperation between the needle 3 and a thread ring catcher (not shown) provided in the workpiece support bed 7. It has become.

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 feed frame 10 supported movably in the front-rear direction (X direction) is fixed.

The connecting rod 11 is supported so as to be movable only in the left and right direction, and supports both sides of the feed frame 10 by guide rollers 12 so as to be movable only in the forward and backward directions, and a rack 13 is connected and fixed to the right end thereof. are doing.

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)
By rotating the feed frame 10 in the right direction (-
(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 towards the rear (-X direction)
Also, by being reversed, the feed frame 10 is moved forward (in the 10Y direction). Therefore, by the forward and reverse rotation of the X- and Y-axis pulse motors 14 and 19, the holding frame 9 is moved to the left and in the front-back direction, so that all positions within the frame 9 are guided to the needle drop position. It has become.

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 connected to the presser drive motor 25 via two wires A724.
5 is rotated in the normal direction, the rotating arm 22 is rotated upward via the wire 24, and by being rotated in the reverse direction, the rotating arm 22 is rotated downward. The presser frame 26 is fixed to the tip of the rotating arm 22, and its frame shape is the same as that of the cloth holding frame 9. When the rotary arm 22 is rotated downward, the presser frame 26 cooperates with the cloth holding frame 9 to clamp the work cloth.

Next, the electric display 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 the rack 13 is moved rightward by the X-axis pulse motor 14, and the cloth holding frame 9 is When the left inner edge reaches the needle drop position,
A movable piece of the switch 31 is engaged 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 rack 18 is moved forward by the Y-axis pulse motor 19, the rear inner edge of the cloth holding frame 9 is moved. When the needle reaches the drop position,
A movable piece of the switch 32 is engaged with the rack 18 and outputs an on signal. "0" as a stitch pitch setting means
The numeric keys 33 from 9 to 9 are automatic return type switches, which are provided in a program operation case (not shown) equipped with the sewing machine, and are used to set the pitch of stitches to be sewn. When each number key 33 is pressed, a code signal corresponding to the pressed key 33 is output.

The X-axis and Y-axis jog keys 34, 35, 36, and 37 are automatic return type switches, which are also provided in the operation case by Δ2, and by pressing one of the XWB jog keys 34, the processing By pressing the object holding device 8 in the left direction in FIG. 1 and, conversely, pressing the other X-axis jog key 35, a pulse signal for moving the object holding device 8 in the right direction is output. Also, one Y-axis jog key 3
By pressing 6, the holding device 8 is moved backward, and by pressing the other Y-axis shock key 37, the holding device 8 is moved backward.
Outputs a pulse signal to move the robot forward.

The program key 38 is also an automatic return type switch provided on 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 three load keys are also automatic return type switches provided in the operation case, and by pressing these, each sewing operation, which will be described later, is performed 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 points Q1 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 stitch formation command creation key 40 is also an automatic return type switch and is provided in the operation case, for example, the 9th switch.
When attempting to sew a curved pattern 47a recorded on a recording paper 47 as a recording medium shown in the figure, the curved pattern 47a shown in FIG. It is used when reading the coordinate positions of sewing points Q, ~Qn, which are arbitrarily divided at larger intervals, and creating a stitch formation command that approximates each sewing point with a circular arc based on the coordinate position data. , this key 4
An on signal based on the pressing operation of 0 is output to the control circuit 41.

A control circuit 41 serving as a control means receives ON signals and code signals from each of the limit switches and keys 31 to 40, and based on these signals, controls the processing while holding the recording paper 47 as shown in FIG. An operation of moving the object holding device 8 and reading the coordinate position data of each sewing point Q, to Qn, and setting each sewing point Q 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,
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 Y-axis pulse motor 19 based on the operation of the Y-axis jog key 36 and 37. Area for storing the number of steps (the amount of movement of the workpiece holding device 8 in the front-rear direction) Y, the rotation direction of the X-axis and Y-axis pulse motors 14 and 19 (the left-right and front-back movement directions of the workpiece holding device 8) SYM area for storing, the number key 3
An area for storing the stitch pitch PITCH set by the operation in step 3, an area for storing content 5M0OTH for determining whether or not the curved stitch formation command key 40 has been operated, and an address ADR of the coordinate memory to be described later. It has a storage area.

The coordinate memory 43 serving as the coordinate position data storage means is also a random access memory, and is used for storing each sewing point Q1 to Q.
The n coordinate position data are sequentially stored at predetermined addresses.

The sewing command memory 44 as a stitch forming command storage means is also a random access memory, and is a random access memory.
A stitch forming command for each stitch is sequentially stored in each address. This stitch formation command is
It consists of the number of steps and rotation direction of the axis and Y-axis pulse motor 14.19.

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, the operation of the sewing machine configured as described above is shown in Figures 2 to 8.
The explanation will be made according to the flowchart of the control circuit 41 shown in the figure.

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 operations 33 to 40.

Here, in order to program the sewing command for the curved pattern 47a recorded on the recording paper 47, the recording paper 47 is held in the workpiece holding device 8, and then the program key 38 is held.
When turned on, the control circuit 41 moves the workpiece holding device 8 to the absolute origin (the position where the back left corner of the cloth holding frame 9 is at the needle drop position>AHP) according to the flowchart shown in FIG.
A drive control signal is output to the pulse motor drive circuit 45 so that the X-axis and Y-axis pulse motors 14 and 19 are controlled in steps. When the holding device 8 is moved to the absolute origin AI-IP, both the X-axis and Y-axis origin limit switches 31 and 32 are turned on, and the control circuit 41 stops the holding device 8 based on the signal. After outputting the drive control signal, the contents of the working memory 42 are cleared,
Waits for next key operation.

Next, by appropriately operating the X-axis and Y-axis jog keys 34 to 37, the sewing starting point Q1 on the curved pattern 47a of the recording paper 47 is
When the holding device 8 is moved so that it corresponds to the needle drop position, the control circuit 41 generates one rotational force of the X-axis and Y-axis pulse motors 14 degrees from the operated keys 34 to 37 according to the flowchart shown in FIG. The direction and amount of rotation are determined, and both pulse motors 14 and 19 are stepped, and the number of steps X and Y of each motor 14 and 19 at that time and the rotation direction SYM are determined.
After storing in a predetermined area of the working memory 42,
Wait for the load key 39 to be operated.

When the load key 39 is turned on, the control circuit 41
According to the flowchart shown in the figure, first, the working memory 4
It is determined whether the 5M0OTH area of 2 is 1 or not. Now, since this S M OOT H area is O, the control circuit 41 next determines whether the data in the X, Y, and SYM areas of the working memory 42 is at the sewing starting point Q, or not. Since the data of the sewing start point Q1 is now stored, the control circuit 41 controls the XY position of the sewing start point Q1 based on the data.
Coordinate position data in coordinates XQ1. Calculate YQt,
It stores it at a predetermined address in the coordinate memory 43, creates a stitch forming command for the sewing start point Q1, stores it at a predetermined address in the sewing command memory 44, and waits for the operation of the numeric key 33.・Next, press number key 3 according to Figure 2.
3 to set the stitch pitch of the curved pattern 47a, the control circuit 41 displays the set pitch on the display device 45, as shown in FIG. 5, and then waits for the next key operation.

Then, when the curved stitch formation command generation key 40 is pressed, the control circuit 41 changes the pitch of the stitches displayed on the display device 45 to the PITC of the working memory 42, as shown in FIG.
Store it in the H area and further store it in 5M0O of the working memory 42.
Shun enters 1 in the TH area and waits for the next key operation.

Here, jog keys 34 to 37 are pressed 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 from the sewing start point Q1 at a distance larger than the appropriately set stitch pitch. When the holding device 8 is moved by a selection operation, the control circuit 41 moves the sewing starting point Q according to FIG.
The working memory 42 stores the rotation direction and amount of rotation of the X-axis and Y-axis pulse motors 14°19 from sewing point Q2 to sewing point Q2.
Store it in a predetermined area.

Then, when the load key 39 is pressed, the control circuit 41 first loads 5M0O of the working memory 42 as shown in FIG.
It is determined whether the THH area is 1 or not. Now 5M0OT
Since the H area is 1, the control circuit 41 determines the XY of this sewing point Q2 based on the data of the sewing point Q2 stored in the Coordinate position data in coordinates XQ2, YO
2 and stores it in the address of the coordinate memory 43 following the address where the data of the sewing point Q1 was stored.

Subsequently, the control circuit 41 determines whether or not 789 is displayed on the display device 45. 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 the sewing point Q2, a sewing point Q separated from the sewing point Q2 by a distance larger than the set stitch pitch
Jog keys 34 to 3 so that the needle drop position corresponds to 3.
7 to move the holding device 8, the control circuit 41 stores the rotation direction and rotation ω of both pulse motors 14 and 19 from the sewing point Q1 to 03 (linear distance) in the working memory 42. Store it in a predetermined area.

Then, when the load key 39 is pressed, the control circuit 41
Based on the data of the sewing point Q3 stored in the working memory 42, the coordinate position data XQ3, YO2 in the XY coordinates of the sewing point Q3 is stored and stored at a predetermined address in the coordinate memory 43.

In this way, the sewing points Q4 to Qn on the curved pattern 47a at intervals larger than the stitch pitch are sequentially stored in the coordinate memory 43. After making the needle drop position correspond to the sewing end point Qn of the curved pattern 47a, the number key 3 is pressed.
3 to display 789 on the display device 45, and then press the load key 39. As shown in FIG. 7, the control circuit 41 stores the coordinate position data of the sewing end point Qn in the coordinate memory 43. , r displayed on the display device 45
After determining the number 789J, the sewing machine starts creating a sewing command for each stitch from the coordinate position data stored in the coordinate memory 43 and sequentially storing it in the sewing command memory 44.

The operation of the control circuit 41 will be explained according to FIG.
The control circuit 41 first sets the start address of the coordinate memory 43 in the ADR@ area of the working memory 42, that is, the address where the coordinate position data of the sewing start point Q1 is stored. Subsequently, the control circuit 41 operates the working memory 4
Based on the address of the coordinate memory 43 set to 2, the coordinate position data of the three points, that is, the sewing start point Q1, the sewing point Q2, and Q3 are read out, respectively, and the coordinate position data of the three points Q1.2 are read as shown in FIG. Find the radius R1 and the coordinates of the center C1 of the circle passing through Q2 and Q3.

Then, from the stitch pitch and radius R1 stored in the PITCH area of the working memory 42, a minute rotation angle θ1 is determined.
is approximated by PITCH/R+.

Then, the section 01 to Q2 of the circular arc of radius R1 passing through 0+, Q2, and Q3 is divided at this rotation angle of 0, and the dividing position, that is, the needle position P for each stitch in the section 01 to 02 is determined. Each needle position P is stored in the sewing command memory 44 as an amount of change in coordinate position from the previous needle position P, that is, a stitch formation command.

When the storage of the stitch forming commands for one section from Q to Q2 is completed, the control circuit 41 increments the address of the coordinate memory 43 stored in the ADR area of the working memory 42 by one, as shown in FIG. , based on this, the three sewing points Q21Q3 from this address and below. The coordinate position data of Ql is read respectively, and the radius R2 and center C2 of a circle passing through these three points Q2, Q3, and Qt are determined.

Then, from the stitch pitch and radius R2, the minute rotation angle θ2 is P
Obtained by approximating ITCH/R2, center C2 and radius R2
Divide the section from 02 to Q3 of the arc by this rotation angle θ2,
The divided position is determined as the needle position P for each stitch in the same manner as described above, and sewing commands are sequentially determined based on the determined needle position P, and sequentially stored in the sewing command memory 44. In this manner, the control circuit 41 calculates the first position ff1P for each stitch up to the sewing end point Qn of the curved pattern 47a, and stores the stitch formation command at that needle position P in the sewing command memory 44.

Needle position P for the entire section from sewing start point Q to sewing end point Qn
is stored in the sewing command memory 44, the control circuit 41 inputs X, Y, SYM of the working memory 42 as shown in FIG.
, clear each area of 5M0OTH and create a curved pattern 47a.
Complete all sewing command creation operations.

When 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 commands, and the workpiece cloth is placed at the sewing starting point Q1 of the curved pattern 47a. A smooth curved pattern is formed in which each section from to the sewing start point Qn is approximated by a circular arc. Furthermore, the sewing points read out to calculate the arc that approximates each section are, for example, Ql, Q2, Q3 when calculating the section 01 to Q2, and Q2, Q3, Qt when calculating the section Q2 to Q. Since each section is read out in duplicate, an arc approximating each section is smoothly and continuously formed at each sewing point 02 to Qnt.

In this way, in this embodiment, by simply reading the coordinate position data of the sewing points Q1 to Qn that are spaced apart from each other at intervals larger than the stitch pitch on the curved pattern 47a recorded on the recording paper 47, the curved pattern 47a can be printed on the curved pattern 47a recorded on the recording paper 47. It is possible to create a stitch formation command that can automatically sew a similar pattern.

This simplifies the process of creating stitch formation commands, improving work efficiency, and - Since the seam formation commands for each needle are formed at positions along circular arcs, very beautiful curved patterns can be created. can be formed.

In addition, in this embodiment, if the operation of the curved stitch formation command creation key 40 is omitted, it is also possible to manually create a stitch formation command for each stitch according to each of the flowcharts except for those shown in 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 that define an interval larger than the set stitch pitch, and based on the data, the coordinate position data of the 3g points are determined. A single circular arc passing through is determined, and a stitch forming command is created that causes relative movement between the needle and the workpiece holding means at approximately every stitch pitch along the circular arc. In order to sew an 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 circular arc pattern will be. Even at this time, the number of coordinate position data to be read remains the same, so the sewing commands are faster than in the past. The creation work can be significantly shortened.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a sewing machine including an electric control circuit according to an embodiment of the present invention, Figs. 2 to 8 are flowcharts showing arithmetic processing operations of the control circuit, and Fig. 9 is a recording FIG. 10 is a perspective view of the body, FIG. 10 is a stitch pattern diagram for explaining the present invention, and FIG. 11 is a diagram showing the contents stored in the working memory. 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 creation key, 41 is a control circuit, and 42 is a work key. memory, 43 is coordinate memory, 4
4 is a sewing command memory, and 46 is a pulse motor drive circuit.

Claims (1)

[Claims] 1. In 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. , a stitch pitch setting means for setting the pitch of stitches to be sewn, and sequentially reading coordinate position data of three points defining an interval larger than the pitch set by the stitch pitch setting means. 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, and reading out the three coordinate position data from the coordinate position data storage means; determining a circular arc that passes through the three points indicated by the position data, and issuing a stitch formation command that causes the relative movement to occur at approximately every set interval set by the stitch pitch setting means along the circular arc; What is claimed is: 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 a seam formation command created by the control means.