JPS639067B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for a embroidery machine to reliably cut the embroidery thread at the final stitch and to reliably treat the thread tail of the cut thread. This invention relates to a thread breakage stitchback control method.

(Prior art) When the embroidery machine changes the color of the embroidery thread or finishes embroidery, the embroidery thread is cut by a thread cutting device. The thread was cut at the seam position. The ends of the cut embroidery threads were left hanging without any special treatment.

(Problems to be Solved by the Invention) As explained in the above-mentioned prior art, when cutting the embroidery thread at the position of the final stitch where the embroidery frame has stopped, the hook of the thread cutting device and the embroidery There was a problem in that the threads did not mesh well and the thread cutting device did not cut the thread for stitching, resulting in a thread cutting error. Furthermore, when the stitching thread is cut at the position of the final stitch, there is a problem in that the new and old stitching threads are damaged by the next stitch movement. moreover,
If you leave the cut end of the thread hanging down, the cut end of the thread will get stuck between the needle that was inserted into the fabric and the new thread when the next needle movement starts, causing the thread to hang down. There was a problem in that when the needle was raised, the new thread would fall out of the needle.

The present invention solves these conventional problems.

(Means for Solving the Problems) The present invention is capable of stopping normal frame output for the embroidery frame when the embroidery machine reads the color change code or end code included in the embroidery data, and Outputs a thread trim stitch back signal to move the sewing frame by a pre-calculated movement distance from the position at the time of reading the color change code or end code, and moves the stitching frame in the direction in which it has been sewing so far. In this state, the embroidery thread is cut by the thread cutting device of the embroidery machine, and then a signal opposite to the thread trimming stitch back signal is output to change the embroidery frame to the state at the time of reading the color change code or end code. After returning to the stop position, the embroidery frame is moved back and forth in a given direction at a constant movement distance, and thread removal control is performed to reliably dispose of the ends of the embroidery thread cut by the thread cutting device. A method for controlling a thread cutting stitch bag in a embroidery machine is provided as a means for solving the above-mentioned problems.

(Function) The present invention is effective when the embroidery machine reads the embroidery data and, in the process of embroidering, reads a color change code that instructs to change the thread color or an end code that instructs the end of embroidery. , stops the stitching operation, outputs a thread trimming stitchback signal to move the stitching frame in the opposite direction to the needle movement direction by a pre-calculated movement amount, moves the stitching frame, and in that state, starts the stitching. The thread trimming device provided in the machine is driven to cut the stitching thread reliably, and then a signal opposite to the thread trimming stitchback signal is output to move the stitching frame before it is moved by the thread trimming stitchback signal. Return to the position of
At that position, the embroidery frame is also reciprocated in a certain direction by a certain amount of movement to ensure that the end of the cut embroidery thread is disposed of.

(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.
A control program for controlling the embroidery machine and a memory element ROM containing basic data,
A memory element RAM that mainly stores embroidery design data, calculation data, etc. is connected, and various interfaces include an operation panel interface 2 that is operated with the operation panel 1 of the embroidery machine, and a embroidery frame 3. an X-axis pulse motor 4 for moving in the respective directions of the X-axis and Y-axis of the coordinates;
A pulse motor interface 7 is connected to a pulse motor driver 6 that outputs drive pulse current to the Y-axis pulse motor 5, and a tape reader interface is connected to a tape reader 8 for reading the tape into which the stitching design data has been input. Ace 9 and a sewing machine main shaft motor interface 11 connected to the sewing machine main shaft motor 10.
An angle sensor interface 13 connected to a rotary encoder 12 for outputting a signal corresponding to the position of the needle bar that moves up and down by the drive of the sewing machine main shaft motor 10 is connected to the microcomputer CPU.

Further, the operation panel 1 includes an operation switch 1A for starting the operation of the stitching machine, and a stop switch 1B for stopping the operation of the stitching machine.
will be provided.

Further, a thread trimming device 14, which is driven in conjunction with the sewing machine main shaft motor 10 and is composed of a thread trimmer, a thread trimming knife, etc., is operated by a thread trimming command output from the microcomputer CPU, and is Performs the thread cutting operation for Yu-thread. At this time, a thread trimming command signal outputted from the microcomputer CPU is inputted to a thread trimming solenoid 16 which serves as a clutch for the thread trimming device 14 via a thread trimming device interface 15.

Next, the operation of this embodiment will be explained.

The tape that has been input with the design data for making the desired embroidery on the fabric etc. with the embroidery machine contains Holes are drilled corresponding to needle movement data for each needle bar, which is made up of function data such as a color change code for instructing color change and an end code for instructing the end of stitching. The microcomputer CPU drives the X-axis pulse motor and the Y-axis pulse motor in synchronization with the movement of the needle bar according to the instruction amount of the tape reader for stabbing read by the tape reader 8. Move Yu frame 3. When the color change code or end code is read during the sewing process, a stop request signal is output to control the sewing machine main shaft motor 10 to prepare for stopping,
When the stop counter, which is set in advance to 2 and which counts the number of inertial revolutions of the sewing machine main shaft motor 10 based on the signal output from the rotary encoder 12, reaches 0, the sewing machine main shaft has stopped completely, indicating that the sewing machine main shaft has stopped. flag, then
Thread cutting stitch back control for cutting the embroidery thread. When the sewing machine spindle stop request flag is set, the microcomputer CPU
outputs a thread trimming stitchback drive signal of a predetermined amount calculated in advance to the X-axis pulse motor 4 and Y-axis pulse motor 5 via the pulse motor interface 7 and the pulse motor driver 6,
The embroidery frame 3 is moved in the direction in which embroidery has been carried out so far, and in this state, a thread cutting device (not shown) is driven to cut the embroidery thread. After that, a thread trimming stitchback return signal is outputted to return the embroidery frame 3, which has been moved in the direction of stitching so far, to the previous stop position by the thread trimming stitchback drive signal, and the stitchback frame 3 is moved back to the previous stop position. Return to the previous position. When the stitching frame 3 is returned to the position before being moved by the thread trimming stitch bag drive signal, from now on, the stitching frame 3 will be moved to
The end of the cut embroidery thread is inserted between the embroidery fabric and the needle plate of the embroidery machine, and then when the embroidery machine is moved, the cut thread is A thread removal operation is performed to prevent the new thread from coming off the needle bar due to interference between the new thread and the new thread.

Next, the operation of this embodiment will be explained with reference to the flow chart 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 turning ON, in step 101,
The microcomputer CPU is initialized, and then, in the stop routine of step 102, the color change process of the embroidery thread, the positioning process for the embroidery start, etc. are performed, and then the operation switch 1A on the operation panel 1 is pressed to start the embroidery machine. let In the operation routine of step 103, the started embroidery machine is operated according to the embroidery data, and when the color change code or end code is read, the process returns to the stop routine of step 102. It shows.

Next, a sewing machine spindle stop routine performed while the sewing machine spindle of the embroidery machine is stopped will be explained with reference to a flowchart shown in 2 in FIG. step
In step 201, when the main shaft of the sewing machine is stopped, the microcomputer CPU clears the working area of the memory element RAM, performs a stop process that is not directly related to the present invention, and then checks whether the operation switch 1A is turned on in step 202. If it is determined that the operation switch 1A is turned on, the process returns to the sewing machine main shaft operation routine described later.

Next, regarding the sewing machine main shaft operation routine, the second
This will be explained using the flowchart shown in Figure 3.

If it is determined in step 202 of the sewing machine main shaft stop routine that the operation switch 1A is turned on, the step of the sewing machine main shaft operation routine is executed.
Step 301, 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 controls the pulse motor interface 7 and
A drive pulse signal is output to the X-axis pulse motor 4 and the Y-axis pulse motor 5 via the pulse motor driver 6 to move the stabbing frame 3 and perform the stabbing, and also to
For example, processing such as yarn breakage detection and various displays is also performed.

In step 303, it is determined whether the stop completion flag of the main shaft of the sewing machine is set, and if it is determined that the stop completion flag is set, the step is taken to the thread trimming stitch back control routine described below indicated by , and the stop completion flag is set. If it is determined that the stop switch 1B is not turned on, the process moves to step 304, and it is determined whether the stop switch 1B is turned on. If it is determined that the stop switch 1B is not turned on, then in step 305, the tape It is determined whether a color change code or an end code as a data function has been read, and if it is determined that there is no color change code or end code, the operation of the embroidery machine is continued. on the other hand,
If it is determined in step 304 that the stop switch 1B is turned on, or in step 305
If it is determined that the color change code or termination code exists, step to step 306.
Set the sewing machine spindle stop request flag and set the stop counter to 2. In the next step 307, after decelerating the sewing machine main shaft motor before stopping, the process returns to the step before the operation processing of the embroidery machine and other operations is performed.After the determination in step 303, it is determined that the sewing machine main shaft stop completion flag is set. If so, proceed to step 401 of 4 in FIG. In step 401, the microcomputer CPU determines whether or not the embroidery frame 3 is at the stop position. When it is confirmed that it is at the stop position, the microcomputer CPU determines whether the color change code or end code has been read in step 402. If it is determined that the color change code or end code has not been read, the sewing machine main shaft operation routine is returned to. On the other hand, if it is determined that the color change code or end code has been read, the embroidery frame 3 that was moved by the thread trimming stitch back control performed during the timing period of the sewing machine main shaft operation routine is moved. In step 403, thread trimming stitchback return control is performed to return to the previous position. The details of the thread trimming stitchback control and the thread trimming stitchback return control will be described later.

When the thread trimming stitchback return control is completed,
The tail of the embroidery thread cut by the thread trimming operation of the thread trimming stitch back control performed in the sewing machine main shaft operation routine is inserted between the cloth (not shown) and the needle plate of the embroidery machine. In order to carry out the punching operation in step 404, the stitching frame 3 is
For example, from the current stopping point, move 0mm in the X-axis direction and -5mm in the Y-axis direction, and then
407, this time move the stitching frame 3 to 0 in the X-axis direction.
After moving the sewing frame 3 by +5 mm in the Y-axis direction and returning it to the above-mentioned stopping point, the sewing machine main shaft operation routine is returned.

Next, the encoder clock interrupt subroutine will be explained with reference 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 501, 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 502, it is determined whether the counter value matches the timing to output data for moving the stitching frame 3. If it is determined that they match, in the next step 503, the machine stops. Determine whether the request flag is set. In this step 503,
If it is determined that the stop request flag is set, the color change code in step 510 or
Move to the step to determine whether the exit code has been read. On the other hand, the step 503
If it is determined that the stop request flag is not set, the microcomputer
In step 504, the CPU outputs the amount of movement X=X0, Y-Y0 for moving the embroidery frame 3.
In the next step 505, the amount of movement X=X0,
The magnitude of Y=Y0 is compared, and if X0>Y0, the process goes to step 506, and if X0<Y0, the process goes to step 507.

Steps 506 and 507 are steps for calculating the amount of movement of the embroidery frame 3 when performing a thread trimming stitchback, and the calculations are performed as follows. For example, as shown in FIG. 3, it is assumed that the stitching progresses in the order of D→C→B→A, and the color changes or ends at point A. The microcomputer CPU outputs a thread trimming stitchback signal and causes the stitching frame 3 to stitchback to a point A' at which the thread is to be trimmed, as shown in FIG. B-
If A'-A is shown on the coordinates, and the distance between B and A in the X-axis direction is X0, and the distance in the Y-axis direction is Y0, then the point
The coordinate position of A′ is X1=0.8 when X0>Y0, Y1=Y0/X0×0.8. In addition, when Y0>X0, Y1=0.8 X1=X0/Y0×0.8. That is, X1 and Y1 are calculated by the microcomputer CPU so that they are proportionally distributed values by comparing the magnitudes of X0 and Y0 so that the axial movement amount of the larger one is 0.8 mm. now,
For example, as shown in Figure 4, X0=13mm, Y=0.5
If mm, then X1 = 0.8mm Y1 = 0.5/1.3 x 0.8mm, but since the value to be determined is one decimal place, it is rounded to Y1 = 0.3mm. in this case,
Since point A' is on the way back from point A to point B, in order to move the embroidery frame 3 from point A to point A', threads corresponding to X1 = -0.8 mm and Y1 = -0.3 mm are required. A cut stitchback signal will be output from the microcomputer CPU.

The calculation result of step 506 or step 507 is stored in the memory element RAM in step 508,
When a color change code or end code is read during the next routine, a thread trimming stitchback signal can be output. next step
At 509, the tape reader 8 starts reading the next data. Thereafter, the process returns to the sewing machine main shaft operation routine.

If it is determined in step 503 that the sewing machine spindle stop request flag is set, the presence of a color change code or end code is confirmed in step 510, and then the next step 511 is performed.
After confirming that the value of the stop counter is 2, in step 512, the output value of the thread trimming stitch bag buffered in step 508 is determined.
A thread cutting stitch back frame corresponding to the values of X1 and Y1 is outputted, the sewing machine main shaft operation routine is returned to, and the thread cutting device 14 is driven to cut the stitching thread.

Note that in step 510, the color change code,
Alternatively, if the end code has not been read, or if the value of the stop counter has not reached 2 in step 511, the routine returns to the sewing machine main shaft operation routine.

If it is determined in step 502 that the counter value by the rotary encoder 12 and the timing of outputting data for moving the embroidery frame 3 do not match, the process advances to step 513, and the process proceeds to step 513. Then, it is determined whether the counter value and the sewing machine main shaft stop timing match, and if it is determined that they do not match, the thread trimming routine step 519 described later is performed.
On the other hand, if it is determined in this step that the counter value and the sewing machine spindle stop timing match, in the next step 514, it is determined whether the sewing machine spindle stop request flag is set and the sewing machine spindle is stopped. If it is determined that the stop request flag is not set, the routine returns to the sewing machine spindle operation routine, and if it is determined that the sewing machine main shaft stop request flag is set, the value of the stop counter is decreased by -1 in step 515.
Then, in the next step 516, it is determined whether the value of the stop counter is 0 or not. If it is determined that the value of the stop counter is not 0, the sewing machine main shaft operation routine is returned to, while the value of the stop counter is 0. If so, take the next step.
517, the sewing machine main shaft motor is stopped, the sewing machine main shaft stop completion flag is set, and the thread trimming solenoid 16 is activated.
After turning off, return to the sewing machine main shaft operation routine.

If it is determined in step 513 that the counter value and the sewing machine spindle stop timing do not match, the process proceeds to step 519 shown at 6 in FIG. 2 via step 513. In step 519,
It is determined whether the counter value and the timing at which the thread trimming solenoid 16 is turned on to perform thread trimming match, and if it is determined that they do not match, the timing processing of the sewing machine and other parts is performed.
If it is determined that the timings match, the value of the stop counter is set to 1 in the next step 520.
If it is determined that the value of the stop counter is 1, in step 521, the color change code,
Alternatively, it is determined whether there is an end code or not, and if it is determined that either code is present, a drive signal is output to the thread trimming solenoid 16 via the thread trimming interface 15 in step 522 to drive it. Therefore, the thread cutting device 14 is activated to cut the stitching thread. After outputting the drive signal to the thread trimming solenoid 16, the process returns to the sewing machine main shaft operation routine via . Further, if it is determined in the judgment step 520 that the value of the stop counter is not 1, and if it is determined in step 521 that there is no color change code or end code, the process returns to the sewing machine main shaft operation routine via let

Next, the encoder origin signal interrupt subroutine when the rotary encoder 12 confirms 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.

As mentioned above, when the embroidery machine reads the color change code or end code during the embroidery process and cuts the embroidery thread, the embroidery frame is calculated in advance from the position of the final stitch. By moving the stitch by the amount of movement, the stitch is returned, and in this state, the thread cutting device of the embroidery machine is engaged with the stitching thread, thereby making it possible to reliably cut the stitching thread. , because the needle position at the start of the next needle movement is different from the cutting position of the embroidery thread, the color-changed embroidery thread,
Or, it is solved that the previous stitching thread is damaged. In addition, in order to control the thread removal,
Because the thread gets between the fabric and the throat plate, there is no interference between the thread end of the cut embroidery thread and the new embroidery thread when the next needle movement starts, and the new embroidery thread can be prevented from coming off the needle. resolved.

In this embodiment, after the stitching frame 3 is returned to the position before thread trimming stitchback by the thread trimming stitchback return signal, the stitching frame 3 is reciprocated by a constant movement amount in the Y-axis direction, for example. A thread removal operation is performed in which the end of the cut stitching thread is inserted between the fabric and the throat plate, but by partially changing the program, the thread removal operation is performed in advance in the thread trimming stitchback signal. The embroidery frame is moved by an amount of movement including the amount of movement for the thread cutting stitchback and the amount of return movement for the thread removal operation. By including in advance the amount of forward movement of the reciprocating movement for the thread removal operation in the stitchback return signal, and returning the embroidery frame 3 to the color change code or end code reading position, It is also possible to perform the thread pulling operation.

(Effects of the Invention) When the embroidery machine reads the color change code or end code, the normal frame output to the embroidery frame of the embroidery machine is stopped to ensure cutting of the embroidery thread. After outputting a thread trimming stitch back signal corresponding to the pre-calculated amount of movement of the embroidery frame and moving the embroidery frame in the opposite direction to the needle movement direction, the embroidery thread is cut by the thread cutter of the embroidery machine. Further, a thread trimming stitchback return signal corresponding to the opposite amount of the thread trimming stitchback signal is outputted to return the embroidery frame to the position before the thread trimming stitchback, and the embroidery frame is kept constant in an arbitrary fixed direction. By reciprocating the sewing thread by the amount of movement and performing thread removal control to dispose of the thread end of the cut sewing thread, it is possible to reliably cut the sewing thread. This eliminates damage to the embroidery thread and prevents the new embroidery thread from coming off due to interference with the tail end of the previous embroidery thread.

[Brief explanation of the drawing]

FIG. 1 is an arithmetic and control system diagram of a embroidery machine according to an embodiment of the present invention, 1 to 7 in FIG. 2 are arithmetic and control flowcharts of an embodiment of the present invention, and FIG.
FIG. 4 is an explanatory diagram of the calculation. 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 leader, 9... Tape leader interface, 10... Sewing machine main shaft motor, 11... Sewing machine main shaft motor interface, 12... Rotary encoder, 13... Angle sensor interface, 14... Thread cutting device,
15... Thread cutting device interface, 16...
Thread trimming solenoid, CPU...microcomputer, RAM, ROM...memory element.

Claims (1)

[Scope of Claims] 1. When the embroidery machine reads the embroidery data and embroiders according to the embroidery data, a color change code or embroidery code that instructs to change the color of the thread included in the embroidery data is provided. A control method that stops the stitching operation when a termination code instructing the termination of stitching is read, cuts the stitching thread, and removes the thread to dispose of the thread end of the cut stitching thread. Pre-calculated movement of the embroidery frame to ensure cutting of the embroidery thread by stopping normal frame output to the embroidery frame of the embroidery machine when the embroidery machine reads the color change code or end code. After outputting a thread trimming stitch back signal corresponding to the amount of stitching and moving the embroidery frame in the opposite direction to the needle movement direction, the thread cutting device of the embroidery machine cuts the stitching thread, and then outputting the thread trimming stitch back signal While outputting a thread trimming stitch back return signal corresponding to the amount of reverse movement and returning the embroidery frame to the position before thread trimming and stitchback, the embroidery frame is reciprocated in an arbitrary fixed direction by a fixed amount of movement, and then A method for controlling a thread cutting stitch bag in an embroidery machine, which comprises processing the ends of cut embroidery threads. 2. Including in the thread trimming stitchback signal the amount of backward movement of the reciprocating movement of the embroidery frame for processing the end of the cut embroidery thread, and moving the embroidery frame; Returning the embroidery frame to the color change code or end code reading position by including the amount of forward movement of the embroidery frame for processing the thread end in the thread trimming stitchback return signal. A stitchback control method in a stitching machine according to claim 1, characterized in that: