JPH0560397B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a control device for an automatic sewing machine.

[Prior Art] FIG. 4 is a block diagram of a conventional general automatic sewing machine control device. In FIG. 4, 1 is a sewing machine head, 2 is a motor that moves a sewing machine needle (not shown) up and down to form stitches on a workpiece (not shown), 3 is a driver that drives the motor 2, 4 rotates together with the upper shaft (not shown) of the sewing machine head 1, and the number of revolutions of the motor 2 indicates the vertical speed of the sewing machine needle, the fact that the sewing machine needle has reached the lowest position (hereinafter referred to as the "needle down position"), and the number of revolutions of the motor 2. Detectors 5 and 6 are sewn objects that detect when the needle has reached the highest position (hereinafter referred to as needle up position) and output a rotation speed signal A, needle down position signal E, and needle up position signal F, respectively. In addition to clamping objects, the clamped workpiece can also be
A pulse motor that drives a presser foot device (not shown) that moves within an XY two-dimensional plane in the X and Y directions on a sewing machine table (not shown); 7 is an XY drive mechanism unit that has pulse motors 5 and 6; , 8 and 9 are drivers for driving the pulse motors 5 and 6;
10 is a feed pulse train generation circuit that outputs a number of pulses corresponding to the cloth feed amount specified by pattern data to be described later to drivers 8 and 9; 11 is a sewing thread cutting device that cuts sewing thread; 12 is a sewing thread cutting device 1
1 is a driver that drives 1; 13 is a sewing machine start switch that starts the sewing machine; 14 is a presser foot switch that moves the presser foot up and down; 15 is a central processing unit (hereinafter referred to as CPU); and 16 and 17 are inputs that input and output data. Output port; 18, system control memory for storing system control programs and data (hereinafter referred to as data); 19, data temporary memory for temporarily storing data; 20, storing predetermined pattern data; The pattern data memory 21 is
CPU15, input/output ports 16, 17, memory 1
Data transmitting data between 8, 19 and 20
bus, 22 is input/output port 16, 17, memory 1
8, 19 and 20 are address buses that transmit addresses to be accessed.

The pattern data recorded in the pattern data memory 20 is sewing data for driving and controlling the motor 2, pulse motors 5 and 6, and sewing thread cutting device 11 to form stitches on the workpiece (hereinafter referred to as actual stitching). 20a, jump feed data 20b for driving and controlling the pulse motors 5 and 6 to position the presser device at a predetermined position without forming stitches on the workpiece (hereinafter referred to as "jump feed"), and other functions; It is composed of various functional data 20c for execution. FIG. 5 is a diagram showing the data structure of this pattern data memory 20. The pattern data is data D7, D6, D5, D4, D3, D2, D1
and D0, and 8 bytes of Y-axis pattern data, consisting of data D7 to D0. Each data has the following meaning.

X-axis pattern data D7...Data indicating the direction in which the presser foot moves, 1
is the positive direction and 2 is the negative direction.

D6, D5...Data indicating sewing machine control, 01
(D6 means 0 and D5 means 1. The same applies hereafter) is the rotation of the sewing machine, 11 is the blank feed, and 00 and 10 are special instruction codes.

D4, D3, D2, D1, and D0 are data indicating the feed amount.

Y-axis pattern data D7, D4, D3, D2, D1, and D0 are data indicating the feed amount.

D6, D5...Speed control data, 00 is thread cutting speed instruction, 01 is medium/high speed instruction, 10 is medium/low speed instruction, and 11 is high speed instruction.

In addition, there are the following special data codes.

21...Start code (sewing start code) X axis =
20H (Displayed in hexadecimal, the following numbers are displayed in hexadecimal.) Y-axis = 00H 22... Reverse presser foot code X-axis = OCOH Y-axis = 00H 23... 2nd origin code X-axis =O1H Y-axis = 00H 24...Intermittent stop code X-axis=80H Y-axis=00H 25...Thread trimming code X-axis=40H Y-axis=00H 26...End code The operation of the control device of the sewing machine will be explained.

When the power is turned on and the presser foot switch 13 is stepped on, the presser foot device lowers and clamps the workpiece.
Next, when the sewing machine start switch 14 is turned on,
The CPU 15 drives the driver 3 via the input/output port 16. When the driver 3 is driven, the motor 2 starts rotating and the sewing machine needle moves up and down. Simultaneously with driving the driver 3 and in synchronization with the needle down position signal E, the CPU 15 reads pattern data for one stitch from the pattern data memory 20, performs the processing shown in the flowchart of FIG. 6, and starts the automatic sewing machine. Drive control.

(1) Step S11 The CPU 15 initializes the sewing machine control.

(2) Steps S12 to S13 The CPU 15 reads the read pattern data as thread trimming code 25, which is one of the special data codes.
It is determined whether or not the code is 25 (step S12), and when it is determined that the thread trimming code is 25, thread trimming processing is executed (step S13).

(3) Steps S14 to S15 The CPU 15 sets thread trimming code 25 in step S12.
If it is determined that it is not a sewing process, it is determined whether or not it is a sewing process (step S14), and if it is determined that it is a sewing process, the sewing process is executed (step S14).
S15). After executing the thread cutting process and the sewing process, the pattern data is sequentially read out and steps S12 to S15 are repeatedly executed.

In controlling the automatic sewing machine mentioned above,
In order to control the sewing thread cutting device 11, it is necessary to always include the thread cutting code 25 in the pattern data when switching from actual sewing to idle feeding.

[Problems to be Solved by the Invention] As described above, when performing normal sewing, the control device of the conventional automatic sewing machine having the above configuration always includes a thread trimming code in the pattern data when switching from actual sewing to skip feed. It is necessary to enter 25, but
For basting stitching in which the sewing thread is not cut, the thread cutting cord 25 is not necessarily required. Therefore, in order to sew based on pattern data, it is necessary to have a sewing machine dedicated to basting stitches and a sewing machine for normal sewing, which reduces work efficiency.
There was a problem of high costs.

The present invention has been made to solve the above problems, and is an automatic sewing machine that can perform normal sewing and basting stitches depending on whether thread trimming is necessary or unnecessary when switching from actual sewing thread trimming to skip feeding. The purpose is to provide a control device for.

[Means for solving the problem] Therefore, in the present invention, the sewing machine needle is moved up and down,
A sewing machine section that forms stitches on a workpiece, a sewing machine section drive device that drives the sewing machine section, an elevation speed detection means that detects the elevation speed of the sewing machine needle, and detects that the sewing machine needle has reached the lowest position. a needle-down position detection means for detecting that the sewing machine needle has reached the highest position; a cloth presser for clamping a workpiece to be sewn and moving the workpiece in a plane; A positioning device for positioning the presser device, a sewing thread cutting device for cutting the sewing thread, a sewing thread cutting drive device for driving the sewing thread cutting device, and a memory storing pattern data consisting of at least sewing data and idle feed data. The pattern data is sequentially read from the memory, and the vertical movement of the sewing machine needle is detected based on the vertical movement speed of the sewing machine needle, the arrival of the sewing machine needle at the lowest position, and the arrival of the sewing machine needle at the highest position. A control device for an automatic sewing machine includes a control means for driving and controlling the sewing machine section, positioning device, and sewing thread cutting device in synchronization with the vertical movement of the sewing machine, and performs sewing corresponding to pattern data. , when the drive control of the positioning device and the sewing thread cutting device shifts to the driving control of the sewing machine section, positioning device and sewing thread cutting device based on the idle feed data to stop the presser foot device at a preset predetermined position, the sewing thread A special data code is provided in the memory to determine whether the cutting device is activated or deactivated.

[Function] In the automatic sewing machine control device having the above configuration, the control means sequentially reads pattern data from the memory, and adjusts the vertical speed of the sewing machine needle detected by the vertical speed detection means and the sewing machine needle detected by the needle down position detection means. The vertical movement of the sewing machine needle is detected based on the lowest position of the needle and the highest position of the sewing machine needle detected by the needle top position detecting means, and in synchronization with the detected vertical movement of the sewing machine needle, When sewing a workpiece according to pattern data, the thread cutting device is controlled via the sewing machine section, the positioning device, the presser foot device, and the thread cutting drive device. At the time of transition, it is determined whether or not to cut the sewing thread using a special code, and when the sewing thread is to be cut, the thread cutting device is driven and controlled.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a control device for an automatic sewing machine according to the present invention. In FIG. 1, 1 is a sewing machine head, 2 is a motor that moves a sewing machine needle (not shown) up and down to form stitches on a workpiece (not shown), 3 is a driver that drives the motor 2, 4 rotates together with the upper shaft (not shown) of the sewing machine head 1;
The vertical speed of the sewing machine needle, the arrival of the sewing machine needle at the needle down position, and the arrival of the sewing machine needle at the needle up position are detected as the rotation speed of the motor 2, and the rotation speed signal A, needle down position signal E, and needle up position are respectively detected. A detector outputs a signal F, 5 and 6 are pulse motors that drive a presser foot device (not shown) in the X and Y directions on a sewing machine table (not shown), and 7 is a pulse motor 5 and 6.
8 and 9 are drivers that drive the pulse motors 5 and 6; 10 is a feed pulse train generation circuit that outputs a number of pulses corresponding to the cloth feed amount specified by the pattern data to the drivers 8 and 9; , 11 is a thread cutting device that cuts the thread, 12 is a driver that drives the thread cutting device, 1
3 is a sewing machine start switch for starting the sewing machine, 14 is a presser foot switch for raising and lowering the presser device, 15 is a CPU, 16 and 17 are input/output ports for inputting and outputting data, 18 is a memory for system control, and 19 is data Temporary memory, 20
is the pattern data memory that stores pattern data in advance, 21 is the CPU 15, input/output port 1
6 and 17, a data bus for transmitting data between memories 18, 19 and 20; 22 is an address bus for transmitting addresses of input/output ports 16 and 17 and memories 18, 19 and 20 to be accessed.

The pattern data stored in the pattern data memory 20 is the sewing data 20 as described above.
a, blank feed data 20b, various function data 20c
and a special data code 20d. The pattern data consists of 8-byte X-axis pattern data consisting of data D7 to D0 and data D7.
It is composed of 8-byte Y-axis pattern data consisting of ~D0, and the meaning of each data is as described above, and its explanation will be omitted. In addition to the above-mentioned special data codes, there is a basting stitch code 32 (X-axis=41HY-axis=00H). This basting stitch code 32 shifts from drive control of the motor 2, positioning device, and thread cutting device 11 based on the sewing data to drive control of the motor 2, positioning device, and thread cutting device 11 based on the idle feed data.
When the presser foot device is stopped at a predetermined position, it is determined whether or not to operate the thread cutting device 11.

Next, the operation of the automatic sewing machine control device according to the present invention will be explained.

When the power is turned on and the presser foot switch 13 is stepped on, the presser foot device lowers and clamps the workpiece.
Next, when the sewing machine start switch 14 is turned on,
The CPU 15 drives the driver 3 via the input/output port 16. When the driver 3 is driven, the motor 2 starts rotating and the sewing machine needle moves up and down. At the same time as the sewing machine needle is driven, in synchronization with the needle down position signal E,
The CPU 12 reads pattern data for one stitch from the pattern data memory 20, performs the processing shown in the flowchart of FIG. 2, and drives and controls the automatic sewing machine. The flowchart shown in FIG. 2 will be explained below with reference to the timing chart shown in FIG.

(1) Step S1 The CPU 12 initializes the sewing machine control.

(2) Steps S2 to S4 The CPU 12 checks that the read pattern data is
It is determined whether the thread trimming code is 25, that is, whether the thread trimming code signal G corresponding to the thread trimming code 25 is at a high level "H" or a low level "L" (see FIG. 3g). (Step S2).
When the CPU 12 determines that the thread trimming code is not 25, it determines whether or not to perform sewing processing (step
S3), and if it is a sewing process, execute the sewing process (step S4).

(3) Steps S5 to S6 The CPU 12 uses thread trimming code 25 at step S2.
If it is determined that basting stitch code 3
2 or not, that is, the basting stitch code signal H corresponding to the basting stitch code 32 is at high level "H"
or low level "L" (see FIG. 3h) (step S5). If the basting stitch code is not 32, thread trimming processing is executed (step S6).

When executing thread trimming process (step S6),
The rotation speed A of the motor 2 is lowered from 2000 rpm to the rotation speed during thread trimming 200 rpm (see Figure 3 a), and when the needle down position signal E is output (see Figure 3 e), the thread trimming operation begins. (see Fig. 3g), and the thread cutting operation is completed in synchronization with the needle up position signal F (see Fig. 3f). Furthermore, after the thread trimming operation is completed, the brake operation is started, and at the same time the thread wiping operation is started (see Fig. 3 d). (see Figure 3a).

Also, when the basting stitch code is 32, change the rotation speed A of motor 2 from 2000 rpm to the thread trimming rotation speed.
Even if the speed is lowered to 200 rpm (see Figure 3 a) and the needle down position signal E is output (see Figure 3 e), the thread trimming operation does not begin (see Figure 3 g) and is synchronized with the needle up position signal F. Then, the sewing machine enters the braking operation, and either skips forward to the next sewing position or finishes the sewing work (see Fig. 3a). Even if such a thread trimming code 25 exists, normal sewing (with thread trimming) or basting stitching (without thread trimming) is selected depending on the presence or absence of the basting stitch code.

Incidentally, after the sewing process (step S4) and the thread cutting process (step S6) are executed, the process advances to step S2 and steps S2 to S6 are repeatedly executed.

[Effects of the Invention] As described above, according to the present invention, the drive control of the sewing machine section, positioning device, and thread cutting device is performed based on the sewing data, and the drive control of the sewing machine section, positioning device, and thread cutting device is based on the idle feed data. When the presser foot device is stopped at a predetermined position, the sewing machine can perform normal sewing (with thread trimming) and Both basting stitches (without thread trimming) can be performed, and work efficiency can be significantly improved, while costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device for an automatic sewing machine according to the present invention, and FIG. 2 is a flowchart showing the operation of the control device for an automatic sewing machine according to the present invention.
FIG. 3 is a timing chart showing the operation of the control device for an automatic sewing machine according to the present invention, FIG. 4 is a block diagram of a conventional automatic sewing machine control device, and FIG.
This figure is a data configuration diagram of the pattern data memory shown in FIG. 4, and FIG. 6 is a flowchart showing the operation of a conventional automatic sewing machine control device. In each figure, 1 is the sewing machine head, 2 is the motor, 3,
8, 9, and 12 are drivers, 4 is a detector, 5 and 6 are pulse motors, 7 is an XY drive mechanism, 10 is a feed pulse train generation circuit, 11 is a sewing thread cutting device, 13 is a sewing machine start switch, and 14 is a fabric presser foot. switch, 15 is CPU (central processing unit), 16 and 17 are input/output ports, 18 is memory for system control, 19 is data temporary memory, 20 is pattern data memory, 20a is sewing data, 20b is blank feed data, 20c is functional data, 20d is a basting code, 21 is a data bus, and 22 is an address bus. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A sewing machine unit that moves a sewing machine needle up and down to form stitches on a workpiece, a sewing machine unit drive device that drives the sewing machine unit, and an up/down speed that detects the up/down speed of the sewing machine needle. a detection means, a needle down position detection means for detecting that the sewing machine needle has reached the lowest position, a needle up position detection means for detecting that the sewing machine needle has reached the highest position, and the sewing object. a cloth presser that clamps the workpiece and moves the workpiece in a plane, a positioning device that positions the cloth presser, a thread cutting device that cuts the sewing thread, and a thread cutting drive device that drives the sewing thread cutting device. a memory that stores pattern data consisting of at least sewing data and jump feed data; and a memory that sequentially reads pattern data from the memory and determines the vertical speed of the sewing machine needle and the arrival at the lowest position of the sewing machine needle. and detecting the vertical movement of the sewing machine needle based on the reaching of the highest position of the sewing machine needle, and driving the sewing machine section, the positioning device, and the sewing thread cutting device in synchronization with the vertical movement of the sewing machine needle. A control device for an automatic sewing machine is provided with a control device for controlling an automatic sewing machine, and a control device for performing sewing according to the sewing data.
Shifting from drive control of the sewing machine section, positioning device, and thread cutting device to drive control of the sewing machine section, positioning device, and thread cutting device based on the idle feed data, and presetting the cloth presser device. 1. A control device for an automatic sewing machine, characterized in that said memory is provided with a special data code that determines whether the thread cutting device is activated or deactivated when the sewing thread cutting device is stopped at a predetermined position. 2. The sewing machine section has a motor that moves the sewing machine needle up and down, and the up and down speed detecting means detects the up and down speed of the sewing machine needle based on the rotational speed of the motor. Control device for sewing machine. 3. The control device for an automatic sewing machine according to claim 1, wherein the positioning device includes a pair of pulse motors that move the presser foot device in two dimensions. 4. The sewing thread cutting device performs drive control of the sewing machine section, the positioning device, and the sewing thread cutting device based on the sewing data, and a drive control of the sewing machine section, the positioning device, and the sewing thread cutting device based on the idle feed data. The automatic sewing machine according to claim 1, in which the sewing thread cutting device is not operated when the sewing data is basting stitching and the presser foot device is stopped at a preset predetermined position. Control device.