JPS6332909B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for repairing threads when a thread breakage occurs in a multi-head automatic embroidery machine, by repairing the threads and then performing a stitchback to continue embroidering. The present invention relates to a method for controlling a stitch bag when a thread breaks in a multi-head automatic embroidery machine for sewing a bobbin thread pulled out onto a piece of fabric on a head that does not break.

(Prior art) Conventionally, in a multi-head automatic embroidery machine, if even one thread breaks, the thread breakage detection circuit detects the thread breakage, or the thread breakage detection circuit detects the thread breakage. The machine automatically stops the main shaft of the sewing machine when the operator visually confirms that the thread has broken, or stops the main shaft of the sewing machine by pressing the stop switch, repairs the thread, and then starts the sewing machine. Stitch back the number of stitches necessary to continue stitching, and until the head where the thread breakage has occurred completes the stitching to the position where the thread breakage was detected, the other heads stop moving the needles and pause the stitching. Later, I sewed the entire head.

(Problems to be Solved by the Invention) In the stitch bag control method when a thread breaks in a multi-head automatic embroidery machine as shown in the above-mentioned conventional technique, the stitch back control method is performed in the process in which the thread breakage head sews to the thread breakage detection position. There was a problem in that as the upper thread of each head was pulled, the lower thread of each head came out above the fabric.

In the present invention, in the process of sewing the head where the thread breakage occurs to the thread breakage detection position, the bobbin thread protruding above the fabric of each head where the thread breakage has not occurred is sewn in. The above-mentioned problem is solved by sewing the entire head from M stitches before the detection position.

(Means for Solving the Problems) The present invention provides for a multi-head automatic embroidery machine to read embroidery data, and when thread breakage occurs in even one embroidery machine in the process of embroidering according to the embroidery data. After detecting or confirming a thread breakage using a thread breakage detection means or visual inspection and stopping the main spindle of the sewing machine, repair the embroidery thread and remove the broken thread head for the number of stitches necessary to continue embroidering. With the embroidery hoop stitched back, if only the head where the thread broke is sewn up to the thread breakage detection position, sew each bobbin thread pulled out onto the fabric of each head where the thread does not break. In order to sew in and sew for storage, an arbitrarily settable number M of sew-in stitches is set in advance, and the whole head is sewn from the number M of stitches counted from the thread breakage detection position. The present invention provides a stitchback control method when thread breaks in a multi-head automatic embroidery machine to solve the above-mentioned problems.

(Function) When the multi-head automatic embroidery machine embroiders multiple heads according to the embroidery data, if one of the embroidery threads breaks, the main shaft of the sewing machine is automatically or artificially cut. After stopping the sewing machine and repairing the thread at the head where the thread has broken, the stitching hoop can be stitched back for the number of stitches necessary to continue stitching, and the main spindle of the sewing machine can be restarted to prevent thread breakage. The raised head will sew up to the thread breakage detection position, and the head that has not caused thread breakage will sew in each bobbin thread that was pulled onto the fabric when it was stitched back. According to the number of sewing stitches M set for sewing and sewing, start sewing from the number M of stitches counted from the thread breakage detection position, including the head where the thread breakage occurred. By sewing the entire head, each of the bobbin threads pulled out is sewn onto the top of the fabric where the thread breakage has not occurred.

(Embodiment of the Invention) Next, the configuration of an embodiment of the present invention will be described with reference to FIG. Figure 1 shows the arithmetic control system of the embroidery machine.The microcomputer CPU contains a control program for controlling the embroidery machine, and a memory element containing basic data.
ROM and memory element that stores calculation data, etc.
The RAM is connected to an auxiliary memory AME for storing tape data into which embroidery design data, function data, etc. are input. Furthermore, various interfaces include an operation panel interface 2 connected to the operation panel 1 of the embroidery machine, and a embroidery frame 3 connected to the
A pulse motor interface 7 connected to a pulse motor driver 6 for outputting drive pulse current to the X-axis pulse motor 4 and Y-axis pulse motor 5 for movement in the directions of the axial and Y-axes, embroidery design data, and a fan. A tape reader interface 9 is connected to a tape reader 8 for reading a tape into which sewing data has been inputted, a sewing machine main shaft motor interface 11 is connected to a sewing machine main shaft motor 10, and a sewing machine main shaft motor 10 is driven to move the machine up and down. An angle sensor interface 13 connected to a rotary encoder 12 for outputting a signal corresponding to the position of the moving needle bar is connected to the microcomputer CPU.

Further, a jump amplifier circuit 1 outputs a drive signal to a jump solenoid 14 which has a function of stopping only the sewing machine needle bar during operation of the sewing machine in order to obtain a stitching width of more than data, for example, 12.7 mm or more.
5 and a stepback single-head switch 16 for switching the jump mode to stepback jump or normal jump.
A jump interface 17 for relaying and outputting jump signals output from the microcomputer CPU is connected to the microcomputer CPU.

In addition, an upper thread breakage sensor 1 is provided for each head.
A needle thread breakage detection interface 19 is provided for relaying the output signal of 8 to the microcomputer CPU.

The operation panel 1 includes a keyboard switch 1A for setting and inputting data, a start switch 1B for starting the movement of the main shaft of the sewing machine, and
A stop switch 1C for stopping the operation of the main shaft of the sewing machine, a stitchback switch 1D for stitching back the stitching frame 3 stitch by stitch, a tape read switch 1E for starting reading of the tape reader 8, and a keyboard switch 1A A data set switch 1F is installed to set the data set in .

Next, an overview of the operation of this embodiment will be explained.

When the operator of the embroidery machine presses the tape read switch 1E on the operation panel 1, the tape reader 8 reads from the tape the X coordinate of the embroidery frame 3.
Reads the X and Y data that determines the amount of movement in the axial and Y-axis directions, and the function data that determines the movement of the needle bar, sewing machine, etc.
Store in auxiliary memory AME. Next, by pressing the data set switch 1F on the operation panel 1, the microcomputer CPU is instructed to start setting the operation of the embroidery frame 3. After performing a manual operation to determine the starting position, the starting switch 1B on the operation panel 1 is pressed to start stabbing.

During embroidery operation, if embroidery repair work becomes necessary due to breakage of the embroidery thread or lack of bobbin thread, the thread breakage detection signal output from the needle thread breakage sensor 18 will detect the needle thread breakage. The main shaft of the sewing machine is automatically stopped by inputting it to the microcomputer CPU via the interface 19, or the main shaft of the sewing machine is stopped by the operator pressing the stop switch 1C.

After repairing the stitching thread, press the stitchback switch 1D to return the stitchback frame 3 by the number of stitches necessary to continue stitching, and then press the stitchback switch on the head that needs stitching repair. Turn on the head switch 16 and turn on the start switch 1B on the operation panel 1.

By pressing the stitchback switch 1D, the stitching frame 3 is stitched back by the number of stitches necessary to continue stitching, and when stitching is resumed and stitches reach the thread breakage detection position, the thread breakage is detected. When the upper thread of the head that is not raised is pulled, the bobbin thread comes out above the fabric, so the embroidery machine needs to sew in the bobbin thread that has been pulled above the fabric. There is. To do this, start sewing the entire head a few stitches beforehand, counting from the thread breakage detection device and setting in advance with keyboard switch 1A.
A sewing stitch is performed in which the bobbin thread protruding onto the fabric is sewn in. In other words, start switch 1B
When the sewing machine is turned on, the sewing machine will continue sewing up to the preset number of stitches before the thread breakage detection position, for example, up to 5 stitches before the thread breakage detection position, for the head for which the stitch bag single head switch 16 is turned on. The stitch back switch 16 is turned on while the stitch back jump is performed according to the normal data using the output signal from the stitch back jump line.
For the head that does not work, the sewing machine continues to jump by the jump ON signal of the normal jump line, stops the operation of the sewing machine needle bar, and sews all the heads from 5 stitches before the set number of stitches to be sewn. Therefore, the needle thread is sewn into the fabric, and the stitching of the entire head is continued.

Next, the operation of this embodiment will be explained in detail according to the flowchart shown in 1 to 7 of FIG.

The main flowchart of the embroidery machine is as shown in 1 in Figure 2, when the power switch of the embroidery machine is turned on.
By being turned on, in step 101,
The microcomputer CPU is initialized, and then step 102 is a stop routine in which the sewing thread color change process, the positioning process for the sewing start, etc. are performed, and then the operation switch 1A on the operation panel 1 is pressed to start the sewing machine. let In the operation routine of step 103, when the started embroidery machine is operated according to the embroidery data and thread breakage occurs, or when a color change code, end code, etc. is read, This indicates a return to the stop routine of step 102.

Next, a sewing machine main shaft stopping routine performed while the sewing machine main shaft of the embroidery machine is stopped will be explained with reference to 2 in FIG. 2 and 3 in FIG. 2. In step 201, the microcomputer CPU
is the memory element when the sewing machine spindle is stopped.
Clear the RAM working area and perform stop processing that is not directly related to the present invention. In step 202, the microcomputer CPU activates the tape read switch 1E provided on the operation panel 1.
It is determined whether or not it is turned on. If it is determined that it is turned on, the process moves to step 203, while if it is determined that it is not turned on, the process moves to step 208, which will be described later. In step 203,
The top address of the auxiliary memory AME is determined, and in step 204, the tape reader 8 reads one stitch's worth of X-axis movement data, Y-axis movement data, and function data, and in step 205, these data are It is stored at the top address of the auxiliary memory AME, and then, in step 206, the address of the auxiliary memory AME is incremented by 1.

Next, in step 207, it is determined whether the memorized function data is an end code, and if it is determined to be an end code, the process moves to step 208, while if it is determined that it is not an end code, the Return to step 204. In step 208, it is determined whether the data set switch 1E provided on the operation panel 1 has already been pressed, and if it is determined that it has not been pressed yet, the process moves to step 209 and it is determined that the data set switch 1E provided on the operation panel 1 has already been pressed. If it is determined that this is the case, the process moves to step 211, which will be described later. In step 209, it is determined whether the data set switch 1F is turned on, and
If it is determined that the button has been pressed, in step 210, the stitch counter that counts the number of stitches to be stitched and the counter A that counts the number of stitches to be moved are cleared. In step 211, it is determined whether the stitchback switch 1D provided on the operation panel 1 is turned on, and if it is determined that it is turned on, the process proceeds to the next step 212, and if it is determined that it is not turned on. If so, the process proceeds to step 219 shown in 3 in FIG. 2, which will be described later.

In step 212, it is determined whether the flag F indicating that the stitchback is in progress is set, and if it is determined that the flag F is set, the process proceeds to step 214 shown in 3 in FIG.
If it is determined that flag F is not set, the process moves to step 213. In step 213, after the stitch count value is stored in the counter A, the process proceeds to step 214 shown in 3 in FIG.
The process moves to step 219, which will be described later, to determine whether the stitch counter is 0 or not.
If it is determined that the stitch counter is not 0,
The process moves to step 215, where the stitchback flag F is set, and in the next step 216, 1 is subtracted from the value of the stitch counter. In step 217, the X data, Y data, and function data are read from the auxiliary memory AME, and the step
In step 218, a drive signal for driving the embroidery frame 3 is output according to the X data, Y data, and function data read out in step 217, and after the execution of step 218 is completed, the process is executed in step 211. Return to

If it is determined in step 214 that the stitch counter is 0, in step 219,
It is determined whether the "setting" switch in the keyboard switch 1A of the operation panel 1 is ON, and if it is determined that it is ON, in step 220,
While inputting the stitchback setting value, e.g. 5, using the keyboard switch 1A, press "Setting"
If it is determined that the switch is not ON, the process advances to step 223 after processing to stop the embroidery machine and other parts. If it is determined in step 221 that the "set" switch in the keyboard switch 1A is ON, the value 5 entered in step 220 is transferred to the auxiliary memory AME in step 222.
After registering, the process proceeds to step 223 after stopping the embroidery machine and other operations. In step 223, it is determined whether or not the start switch 1B of the operation panel 1 is turned on. If it is determined that it is turned on, the program returns to the sewing machine main shaft operation routine, while if it is determined that it is not turned on, The process returns to step 202 via .

Next, regarding the sewing machine main shaft operation routine, the second
This will be explained using the flowchart shown in Figure 4.

If it is determined in step 223 of the sewing machine main shaft stop routine that the start switch 1B is turned on, step 301 of the sewing machine main shaft operation routine is performed.
Then, the sewing machine main shaft motor 10 is driven via the sewing machine main shaft motor interface 11 by the output signal of the microcomputer CPU. In step 302, the working area of the memory element RAM is brought to an initial state, and the clock interrupt and origin interrupt of the rotary encoder 12 are set.

After step 302 is executed, the main shaft of the sewing machine starts operating, the hands start moving, the count signal from the rotary encoder 12 is input as an interrupt at any timing according to the encoder clock interrupt subroutine described later, and ,
According to an encoder origin interrupt subroutine to be described later, the origin signal of the rotary encoder 12 is inputted at an arbitrary timing, and the stitching is performed by moving the hands and moving the stabbing frame 3.

The microcomputer CPU is inserted into the frame 3.
According to the movement data X, Y, the pulse motor interface 7 and the pulse motor driver 6
A drive pulse signal is output to the X-axis pulse motor 4 and the Y-axis pulse motor 5 via the embroidery frame 3 to move the embroidery frame 3 and perform embroidery, as well as display various displays not directly related to the present invention, such as etc. will also be processed.

In step 303, it is determined whether the stop completion flag of the sewing machine spindle is set, and if it is determined that the stop completion flag is set, the routine returns to the sewing machine main spindle stop routine, while it is determined that the stop completion flag is not set. If so, proceed to step 304, and determine whether or not a thread breakage has occurred based on the output signal of the thread breakage sensor 18. If it is determined that a thread breakage has not occurred, proceed to step 304.
In the next step 305, it is determined whether the stop switch 1C is turned on, and the stop switch 1C is turned on.
If it is determined that it is not turned on, the step
In step 306, it is determined whether the color change code or end code as a tape data function has been read, and if it is determined that there is no color change code or end code, the embroidery machine's Continue driving. On the other hand, the step
If it is determined in step 304 that thread breakage has occurred, if it is determined in step 305 that the stop switch 1C is ON, and if it is determined in step 306 that the color change code or end code is present, step Step to 307, set the sewing machine spindle stop request flag, and set the stop counter to 2.
Set to . Next, in step 308, the main shaft motor of the sewing machine is decelerated before stopping, and then returned to the step before the operation of the sewing machine and other operations is performed.

Next, the encoder clock interrupt subroutine will be explained according to the flowchart shown at 5 in FIG.

As shown in the sewing machine spindle operation routine above,
A clock signal from the rotary encoder 12 is input via the angle sensor interface 13 to the microcomputer CPU as a needle bar position signal. In step 401, when one count signal of the rotary encoder 12 is input,
The counter of the microcomputer CPU is incremented by one. In the next step 402, it is determined whether the counter value matches the timing of outputting the signal to the jump line. Specify the address of the auxiliary memory AME and read the function data from the corresponding address. If it is determined in step 404 that the set value of counter A is greater than the sum of the stitch count number and the set stitch back number, the process moves to step 405, while the set value of counter A is smaller. If it is determined that
Proceed to step 408. In step 405,
It is determined whether the function data read in step 403 is jump data, and if it is determined to be jump data, in step 406,
Turn on the stitch back jump line and perform the stitch jump according to the normal data. On the other hand, if it is determined in step 405 that the function data is not jump data, the process moves to step 407 and the normal jump line is determined.
Turn it ON, stop the needle movement, and return to the sewing machine main shaft operation routine.

In step 404, if the sum of the stitch count value and the stitch back setting value is greater than the setting value of counter A, the step
In step 408, it is determined whether the function data read in step 403 is jump data. If it is determined to be jump data, the process moves to step 409, while if it is determined not to be jump data, Proceed to step 410.

In step 409, the normal jump line and stitch back jump line are turned on to sew the entire head. In step 410, it is determined whether the stitch counter value and the value of counter A match. If it is determined that they match, in the next step 411, the flag F indicating that stitchback is in progress is turned OFF, and the sewing machine main shaft operation routine is started. Make it return. Furthermore, in step 410,
If it is determined that the stitch counter value and the counter A value do not match, the routine returns to the sewing machine main shaft operation routine.

In step 402, the rotary encoder 12
If it is determined that the value of the counter that counts the signals does not match the timing of outputting the signal to the jump line, the process moves to step 412.
In step 412, rotary encoder 12
It is determined whether the value of the counter that counts the signals of If it is determined that there is not, the process proceeds to step 416 shown at 6 in FIG.

In step 413, stitch frame 3 is selected from the auxiliary memory AME according to the value of the stitch counter.
In step 414, drive signals are output to the X-axis pulse motor and Y-axis pulse motor according to the X-axis data and Y-axis data, and the embroidery frame is 3, and in step 415, the stitch counter increases.
After advancing one step, return to the sewing machine main shaft operation routine.

In step 416, rotary encoder 1
It is determined whether the value of the counter that counts the signal No. 2 matches the stop timing of the sewing machine main shaft. If it is determined that they match, the process moves to step 417, while if it is determined that they do not match. In this case, after performing other timing processing,
Return to the sewing machine spindle operation routine to execute the sewing machine spindle stop routine.

In step 417, it is determined whether the sewing machine spindle stop request flag is set, and if it is determined that the sewing machine main spindle stop request flag is set, in step 418, 1 is subtracted from the value of the stop counter, and as a result, step
419, it is determined whether the value of the stop counter has become 0, and if it is determined that it is 0, the step
At 420, after applying a brake to the sewing machine main shaft motor 10 and setting a sewing machine main shaft stop completion flag, the routine returns to the sewing machine main shaft operation routine in order to execute the sewing machine main shaft stop routine.

Next, the encoder origin signal interrupt subroutine when the rotary encoder 12 secures the origin will be explained with reference to the flowchart shown at 7 in FIG. This is done by sending the origin signal to the encoder counter of the microcomputer CPU when the rotary encoder 12 confirms the origin, as shown in step 601. This indicates that the value should be set to 0.

In this way, by executing the sewing machine spindle operation routine including the initial routine, sewing machine spindle stop routine, encoder clock interrupt subroutine, and encoder home position signal interrupt subroutine, if the sewing thread breaks, By sewing the entire head from a preset number of stitches before the thread breakage detection position, defect-free stitching can be achieved.

(Effects of the Invention) The present invention, when a thread breakage occurs in the stitching thread in a multi-head embroidery machine, sews all heads from a preset number of stitches before the thread breakage detection position to prevent the thread breakage from occurring. This has the effect of sewing the pulled bobbin thread onto the fabric of each head that has not caused thread breakage when stitching to repair a stitch on the head that has caused thread breakage.

[Brief explanation of the drawing]

FIG. 1 is an arithmetic and control system diagram of an embroidery machine according to an embodiment of the present invention, and 1 to 7 in FIG. 2 are arithmetic and control flowcharts of an embodiment of the present invention. 1... Operation panel, 2... Operation panel interface, 3... Stitching frame, 4... X-axis pulse motor, 5... Y-axis pulse motor, 6... Pulse motor driver, 7... Pulse motor interface Ace, 8...Tape reader, 9...Tape reader interface, 10...Sewing machine main shaft motor, 11...Sewing machine main shaft motor interface, 12...Rotary encoder, 13...Angle sensor interface, 14...Jump Solenoid, 15...Jump amplifier circuit, 16...Stitch bag single head switch, 17...Jump interface, 18...Needle thread breakage sensor, 19
...Needle thread breakage detection interface, CPU...
Microcomputer, RAM, ROM...storage element, AME...auxiliary memory.

Claims (1)

[Claims] 1 The multi-head automatic embroidery machine reads the embroidery data, and if even one embroidery thread breaks during the embroidery operation according to the embroidery data, the main shaft of the sewing machine is stopped, and then the embroidery head is removed. When repairing a thread breakage and continuing stitching, the stitching frame is moved back by an amount equivalent to the number of return stitches required for the thread head to continue stitching, and the sewing machine main spindle is restarted. By the way,
The head that caused the thread breakage restarts the stitching from the stitch bag position, while the head that does not cause the thread breakage restarts the stitching from a position M stitches before the thread breakage detection position, and from this position. By performing full head stitching, when the embroidery hoop is stitched back, the bobbin thread pulled out onto the embroidery fabric of each head that has not caused thread breakage is sewn from the full head stitch start position. A stitchback control method when thread breaks in a multi-head automatic stitching machine, which is characterized by stitching.