JPS6142597B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine that combines program control and a low inertia motor.

The sewing machine of this invention has two main components. One is a control unit operated by a microprocessor that cooperates with the various elements, and the other is a predetermined drive installed in the housing of a low-inertia motor controlled by an electronic control unit. It is a mechanism, and various operations can be performed by these control parts and drive mechanism parts. It can be a high performance industrial machine,
This is a much improved version of the conventional automatic sewing machine.

The sewing machine according to the above-mentioned proposal is capable of automatically performing a large number of types of sewing operations, and all or any of the operations are pre-programmed into the sewing machine or self-learned by the sewing machine. The operator does not need to act on any control mechanism until one of the operations is performed. Regarding the self-learning characteristic of this sewing machine, in order for this sewing machine to automatically perform a predetermined task, the operator must not only perform the corresponding task using the sewing machine, but also perform sewing operations in this way. and any one of its phases are automatically recorded in a program storage device, so that the above operation can be automatically executed a desired number of times.

As described above, various advantages derived from the above-mentioned characteristics are obvious, and the sewing machine according to the present invention has
It eases the sewing work that the operator has to do and allows the sewing to be done quickly and normally without any kind of error during the sewing work.

The above control device receives commands from operating programs stored in the computer, data input via external elements such as various push buttons, end-of-stroke position detection elements, and position sensors. It is based on the main processing unit or microprocessing unit that performs the processing. The operation of this main processing unit is controlled based on reference clock time, and this main unit is connected to two memory blocks: a dynamic computer (RAM) and a static computer (EPROM). has been done.

The above dynamic computer (RAM) is
Some stores data related to predetermined sewing operations to be performed by the sewing machine. A static computer, assisted by three (EPROM) type computers, stores control programs for controlling the operation of the various components of the sewing machine.

As peripheral elements, a plurality of sensors, a group of photoelectric couplers, a plurality of stroke end position detection elements, etc. are provided. It is designed to send out information regarding the position of the thread trimming device, the position of the free presser foot, the position of the operating pedal of the sewing machine, etc. In this way, the main processing unit constantly manages the states of the elements it attempts to control.

The main feature of the sewing machine described above is that it has as drive component a low-inertia motor controlled by a control device, which means that the sewing machine according to the invention and the mechanical clutch and brake are installed. This is a significant difference when compared with conventional sewing machines equipped with a new motor.

As described above, the use of a low inertia motor combined with an electronic device in a sewing machine provides various new and superior advantages over conventional sewing machines, including the following.

The first motor attached to a conventional sewing machine is
Although power is always consumed whether a sewing operation is performed or not, the motor of the sewing machine of the present invention is completely inactive when no sewing operation is required. Unless there is a request to change the fabric feeding rate, feed, sewing monitoring, etc., the manual labor performed by the sewing machine operator during the period when sewing is not being performed will add up to the total time of the sewing process. As is clear from the fact that it is proportional,
The above-mentioned characteristics imply that substantial power savings can be made. During such a period, although the motor of the conventional sewing machine continues to rotate, its rotational force is not transmitted to the drive element of the sewing machine. On the other hand, in the sewing machine according to the present invention, the low inertia motor can be stopped when the sewing needle is not in use. In this way, wasteful power consumption by the motor during the idle period is prevented, and theoretically, considerable power can be saved.

Second, various operating speeds of the sewing machine are obtained by applying various voltages to a low-inertia motor, and the operating speeds can be accurately obtained and any of the components Problems caused by wear and tear are also eliminated. In contrast, conventional sewing machines use a clutch to create coarser,
Alternatively, different actuation speeds can only be obtained with poor timing accuracy. in this way,
In this invention, since there are no parts that constantly wear out, it is possible to reduce the amount of materials used, and it is also possible to eliminate the need for replacing worn components and periodic inspections.

Third, automatic stopping of the sewing machine can be accomplished by simply applying a reverse voltage to the terminals of the low-inertia motor during the deceleration period, which is a substantial improvement. In contrast, stopping the motor in a conventional sewing machine requires mechanical application of a brake similar to the clutch described above, which is costly. Therefore, with this conventional method, it is not possible to obtain a highly accurate motor stop position.

Fourth, the D/A that controls the control circuit of the motor
By changing the input signal to the conversion circuit, various motor speeds can be obtained. Therefore, as in the embodiment of the present invention, digital speed information for the motor can be obtained. It is possible to have a wide sewing operation speed range that can be changed to various speeds from 0 to 256 steps based on the determined 8-bit information.

Fifth, since the method allows for different operating speeds, the operating speed of the motor will only be limited by the working capacity of the sewing machine, and therefore,
The output (production amount) could be at a much higher production rate than that obtained by conventional methods.

Sixthly, as mentioned above, despite the various advantages, the sewing machine according to the invention is slightly cheaper to manufacture than it would be to make a sewing machine with a conventional clutch and brake-based motor. can do.

The low inertia motor is controlled by a speed controller receiving signals from a digital-to-analog converter and connected to a feedback block for the operating status of the motor, which digital-to-analog converter and feedback block are connected to the feedback block described above. This constitutes an interface for coupling to the main processing unit. The operation of the sewing machine can be carried out in such a way that the operating speed of the sewing machine can be set to various speeds at appropriate instants, and the sewing needle is placed in the correct position at appropriate times, for example, in the raised or lowered position of the sewing machine. This main processing unit controls the low inertia motor so that it can be stopped.

The sewing machine according to the present invention is generally composed of three large blocks. The first block is
As mentioned above, it preferably corresponds to a main processing unit controlled by a microprocessing unit such as the known Z-80. The second block is a low inertia motor with circuitry adapted to be compatible with a sewing machine. The third block includes, for example, a sewing needle position sensor, a free presser foot (presser bar), an electronic tachometer, an operating pedal circuit,
All peripheral elements, such as electric valves, provide appropriate information to the main processing unit.

A sewing machine configured in this manner is a highly productive sewing machine that can perform various operations without restriction so as to free the operator from controlling and manual labor over the garments to be sewn.
The sewing machine itself is unique in that it self-learns various operations by simply performing basic operations once.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In addition, the numbers enclosed in circles in the drawings indicate connections with those in other drawings. Further, constituent parts of various functions of the apparatus in the drawings are simply indicated by numbers.

FIG. 1 shows an example of a sewing machine according to the present invention that is equipped with a programmable control circuit and a low inertia motor.

The sewing machine is equipped with a microprocessor 1 controlled by a clock circuit 2, that is, a reference frequency signal generator.
It is directly connected to a memory block in the dynamic computer 3 (RAM) and to a memory block in the static computer 4, and is supplementarily connected to a memory block in the static computer 4.
It is connected to an EPROM type storage unit. The dynamic computer 3 stores various data for executing predetermined tasks, while the static computer 4 executes the operations of the sewing machine and stores programs for continuous data manipulation and control. Saved.

The above component has three input/output units,
External peripheral elements that cooperate with P10φ, P101, and P102 to control the sewing machine are connected. A decoding circuit, that is, a logic/analog converter 5 is provided, and this converter 5 translates the characters of the signal applied to the input/output unit and sends the translated signal to the input/output unit. I'm starting to do that.

Furthermore, in the block diagram of FIG. 1, block 6 corresponds to a synchronization block for programming the operation of each mechanical component of the sewing machine body 7. Similarly, block 8 has a safety circuit for the thread trimmer which is designed to prevent the sewing needle from lowering when the thread trimmer has not yet been withdrawn from its operating position. The operating pedal 9 of this sewing machine is connected to an electronic block 10. This electronic block 10 is equipped with a series of electronic circuits, for example, a group of photoelectric sensors, and each photoelectric sensor is adapted to detect the operating position of the operating pedal 9 of the sewing machine. This allows various sewing operation speeds to be obtained.

Furthermore, a keyboard 11 is provided for adjusting and controlling the operation of the sewing machine. 1st
As clearly shown in the figure, the motor 12 is connected to a block 13, which
It is constructed as shown in FIG.

Next, the control device for the sewing machine described above will be further explained in detail with reference to the accompanying drawings.

As mentioned above, the control device consists of three (EPROM) type computer blocks 1
5, and (RAM) computer block 1
These blocks 15 and 16 are based on a microprocessor 14 connected to
Logically connected to command buses Aφ, A1, ......, A14, and data buses Dφ, ......,
Connected to D7. The microprocessor 14 is controlled by a clock circuit 2 shown in FIG. This clock circuit 2 uses an astable multivibrator 17 or a crystal oscillation circuit 18. The output signal of this crystal oscillation circuit 18 is transmitted to a block 20, that is, a CTC (counter/timer).
The signal is sent to a counter divider 19 connected to the circuit. CTC block 20
In addition to functioning as a clock signal coupling means for the microprocessor 14, it also operates as a peripheral device that receives signals from the device 21 and counts the number of stitches made by the sewing machine. There is. The device 21 uses a wheel that is in constant contact with the fabric to be sewn and generates a train of electrical pulses that are sent to the CTC block 20 while the fabric passes under the sewing needle. It is something to do.

As shown in FIG.
Decoders 22 and 23 are provided so that correct processing can be performed based on signals from the data bus, and a buffer 24 is provided at the output end of the data bus.

The input/output line groups corresponding to the input/output units P10φ, P101, and P102 are used as means for the main processing unit, that is, the control device, to receive information from all the peripheral elements. Electronic block 10 of the operation pedal 9
A signal from the synchronous block 6 connected to the motor, a signal from the block 13 for controlling the low inertia motor, a signal from the control panel 25, a button 26 for the end/stop command.
to cooperate with the signal from and the sewing machine concerned,
It is adapted to receive signals from a group of electric valves connected to the power supply section 27. These electric valve groups are as follows: electric valve 28 is associated with the free presser foot, electric valve 29 is for the stop command at the end of the sewing operation, and electric valve 30 is the thread trimming device. The electric valve 31 is for setting the thread trimming device to the correcting position, and the electric valve 32 is for commanding the operation of the stacking element of the sewing machine.

The input/output line group mentioned above is as shown in Fig. 2.
Wired.

It is used to detect various operating positions of the operating pedal 9 of this sewing machine. A group of N-circuits having the same configuration is shown in FIG. This N-
Each circuit in the circuit group is basically constructed using a photoelectric coupler 33 which sends its output signal to the input/output unit P101.

A concrete circuit of the synchronization block 6 and the safety block 8 of the thread cutting device is shown in FIG. This synchronization block 6 is equipped with a plurality of sensors for detecting and controlling the various operating positions of the sewing needle and thread cutting device. The sensor that detects the raised position where the sewing needle is raised and the lowered position where the sewing needle is lowered is configured using two photoelectric elements 35 and 36. It is designed to always inform you of the operating position. Sensors 36 and 37 similar to these are used for controlling the thread cutting device, and for controlling the reset of the thread cutting device, respectively.
That is, the thread cutting device operates as a cutter at its return position. Based on the information obtained by these sensor elements, when the cutter of the thread trimming device is in operation, the sewing needle of this sewing machine is prevented from descending, thereby preventing the sewing needle from being inevitably damaged. It's becoming like that. Signals sent from these photoelectric sensors 34, 35, 36 and 37 are processed by a circuit 38 connected to the input/output unit via appropriate lines.

Detects the cutting position of the needle thread of this sewing machine, and
In order to prevent the sewing machine from operating without an upper thread, a photoelectric sensor 39 is connected to a displacement recorder 40 and a master-slave type JK flip-flop 41, as shown in FIG.
is provided.

The sewing machine is adapted to cooperate with a numerical display device 42, which is connected via a driver 43 to the control device, ie to the main processing unit 14. This display device 42 is
It functions as a means for transmitting information on various operating positions of the sewing machine to the operator.

Due to the above-described configuration, the sewing machine of the present invention is automatically controlled even though it is a type that uses a motor. Furthermore, the sewing machine according to the present invention is equipped with a low-inertia motor controlled by a speed control device that operates subordinate to the main processing unit, thereby improving the performance of the drive mechanism.

Next, the configuration of the low inertia motor and its speed control device will be explained with reference to FIG. 4.

The motor 12 has a speed control device 44 connected via a coupling interface 45 to the preceding control device, that is, the above-mentioned main processing unit, block 46, again shown in general form in FIG. Power is now being supplied from The coupling interface 45 consists of a digital/analog converter 47 and a feedback block 48 for operating status signals. Additionally, the motor 12 incorporates an electronic tachometer 49 connected to the speed controller 44.

The speed control device 44 is composed of two large functional blocks 50 and 51, as shown in FIG. One block 50 is composed of a circuit for adjusting the speed of the low inertia motor 12.
Each input terminal of this circuit receives a signal from a digital/analog converter 47, a signal representing the magnitude of the feedback amount from a feedback block 48, and a tachometer 4.
9 output signals are applied.
The output of this block 50 is a signal representative of the operating state of the low inertia motor 12.

The other block 51 is a power supply stage for supplying power to the motor 12.
is a first AC/DC converter 52 and the converter 52
It consists of an amplitude control DC/AC converter 53 connected to the control DC/AC converter 53, and a novel second AC/DC converter 54 connected to the control DC/AC converter 53 to control two directions. ing.

In this manner, the speed control circuit 44 is connected to the low-inertia motor 12 and applies the necessary information to the motor 12, so that the various operations and braking actions of the motor 12 are controlled by the preceding control device 46, i.e. , are performed in response to signals applied from the main processing unit mentioned above. The operating speed of this motor 12 is
It is sensed by an electronic tachometer 49 which sends information to the speed control device 44 as appropriate.

In the speed control device 44, as shown in FIG. 5, the block 50 of the device 44 has at its input terminal 55 a coupling interface which cooperates with the preceding control device 46, as described above. Digital/analog converter 47 in 45
receive a signal from. The block 50 also receives a signal representing the rotational speed from a feedback circuit 57 via a line 56, and a signal representing the amount of feedback from a feedback circuit 59 via a line 58. Then, this block 50 is connected to the line 60 at each instant.
A signal containing information regarding the state of the low-inertia motor 12 is sent out, and this signal is applied to an interface 45 that is connected to a preceding control device 46 .
This block 50 is connected via lines 61 and 62 to
The low inertia motor 12 is connected to the block 51.
The rotation speed and direction of rotation can be easily controlled.

The block 51 is connected via line 63 to the frequency
50 cycles/second of current, and this current is applied to the AC/DC converter 52 and the converter 52
The rectified current is output to the output terminal. This AC/DC converter 52 is connected to a control DC/AC converter 53, and a signal within a frequency range of 20 KC/S is sent from the converter 53. The electrical network in the conversion stage of these converters 52 and 53 converts the power to 50
It is now possible to convert from C/S to 20KC/S.
Since these circuits are operated at a high frequency, the transformer 64 for powering the motor 12 can use a ferrite core, thus having the minimum capacity. The amount of power supplied itself becomes large.

Furthermore, the transformer 64 is connected to the low inertia motor 1
Another AC/DC converter 5 directly connected to 2
4 and drives the motor 12 at a predetermined speed.
In addition, a predetermined amount of power is supplied so as to rotate in one direction or another direction.

Due to the above-mentioned configuration, the sewing machine becomes heavy and large, and its manufacturing cost becomes high, as in the case of conventional sewing machines.Furthermore, in addition to these problems, it also causes heat problems during operation and many other problems. One can point out the advantage of not having to use a metal core transformer, which caused problems such as power consumption.

An example of a specific logic circuit of the block 50 is shown in FIG.

In the above circuit, when the input terminal 65 receives a signal from the upper control device 46, that is, the main processing unit, this signal is sent to the D/A converter 47, which sends a signal representing the speed code for the motor 12. The signal output from the D/A converter 47 is applied to the operational amplifier 66. The output of this operational amplifier 66 is distributed to operational amplifiers 67 and 68. This block 50 also receives a signal representative of the rotational speed from a feedback circuit 57 via line 56. Then, based on the result of comparing the reference voltage signal sent from the D/A converter 47 and the feedback signal representing the rotation speed received via the line 56, one of the operational amplifiers 67 and 68 is selected. one is activated and the output signal of this activated operational amplifier is sent to terminal 69, this output signal is
is applied to the trip circuit shown in FIG. 7, and thus the block 5 shown in FIG.
3, that is, a controlled DC/AC converter is configured. Furthermore, the circuit 53 of this block receives a signal representing the amount of feedback via a transformer 64, which signal is regulated by an operational amplifier in the circuit 53 and is thus applied via the transformer 64. A signal for controlling the motor 12 at a constant speed is generated depending on the magnitude of the signal.

As mentioned above, based on the comparison between the signal from the D/A converter 47 and the feedback signal representing the rotational speed from the line 56, the photoelectric coupler 70 or 68 is activated depending on whether the operational amplifier 67 or 68 is activated. 71 is turned on.

The above-mentioned opto-electric couplers 70 and 72 connected to delay step circuit 72 are connected to transistor 7, respectively.
The transistors 79 and 80 are connected to the bases of transistors 3 and 74, and are turned on by the outputs of terminals 75-76 of transistor 73 or the outputs of terminals 77-78 of transistor 74, respectively. In this way, as shown in FIG. 8, the direction of rotation of the low inertia motor 12 connected to these transistors 79 and 80 is determined.

The signal output to the terminal 69 of the circuit shown in FIG. 6 is applied to an integrated circuit 81 that generates two series of pulse train signals, as shown in FIG. The pulse width of these pulse train signals is determined by the terminal 69.
It responds precisely to the signal applied to it.

The above-mentioned two pulse trains are not output at the same time, and therefore, as shown in FIG. 8, transistors 82 and 83 of the power supply circuit are not turned on at the same time.

A block 84 shown in FIG. 7 is for outputting a pulse train for switching at high speed to the bases of the transistors 82 and 83. The low voltage side of these transistors 82 and 83 is
OV, and the transistors 82 and 83 are quickly turned on and off as the base of each transistor is repeatedly turned from positive to negative and again from negative to positive.

The circuit configured as described above allows control of the low-inertia motor 12 without degrading the operating characteristics of the sewing machine, which is large in capacity, large in size, and consumes a lot of power, as in conventional sewing machines. It can be done. In this way, the transistors used in the circuit can be made small, and these transistors can be operated at high frequencies and with high precision.

The electronic unit of the above sewing machine has a 9th
Power is supplied by the power supply circuit shown in the figure. In this power supply circuit, the component parts 93 each have a bridge rectifier circuit 94a, a bridge rectifier circuit 94a,
Each circuit 94a, 94b, 94c is a transformer equipped with an output terminal for applying voltage to 94b, 94c.
The input voltage is rectified and controlled by integrated voltage regulators 95a, 95b, and 95c.

Further, the electronic devices that function in various ways in the sewing machine according to the present invention are each supplied with power at various voltages from the power supply circuit.

FIG. 10 shows a specific example of a control panel 25 that provides good operability for the operator who controls the sewing machine. The control panel 25 is adapted to cooperate with a numeric display device 42 which constitutes an information transmission mechanism for the operator to operate the sewing machine in various operating modes. Switches 96 and 97 are for selecting the various types of stitches to be performed on the machine. When operating in manual mode, a switch 98 allows manual selection. Similarly,
When the sewing machine is automatically operated, the operating speed is selected by operating a switch 99.

The switch 97 is provided so that a desired stitch number can be manually selected, while when the switch 100 for data input command is pressed, the switch 97 automatically selects the desired stitch number. The stitch length can now be adjusted.

Keys 101 and 102 are used to select an operation to be performed by the sewing machine and to set the sewing machine to a learning state. When set in this learning position, the sewing machine automatically receives one by one all the data it needs to sequentially perform the sewing operations it has learned. In this way, the operator simply manually performs the operation that corresponds to the sewing operation that he or she wishes to perform.
You only need to do it once.

Corresponding to all the switches and keys described above, LEDs (light emitting diodes) constituting display elements are provided so as to always display the operating status of the sewing machine.

With such a configuration, an automatically controlled sewing machine equipped with a low inertia motor, which is the object of the present invention, can be obtained.

Among the various properties obtained by the above-mentioned sewing machine, the following properties are particularly excellent. That is, the above-mentioned sewing machine does not carry out any automatic operation, and is completely automatic, which performs normal sewing operations and automatically forms finishing stitches at both the start and end of the sewing operation. It is possible to perform both basic and basic sewing operations.
The number of finishing stitches can be selected at will by a corresponding switch.

Furthermore, when the sewing machine learns, that is, when the sewing machine memorizes the data of predetermined operations in response to the operator's manual operations, it eliminates the length differences introduced involuntarily for all the operations performed by the operator. Once learned, the sewing machine can accurately perform sewing operations.

Further, depending on the storage capacity of the sewing machine, the sewing machine can perform a wide variety of complicated sewing operations, and can have a wide variety of sewing operation characteristics.

The speed control device that controls the above low inertia motor is
It can be said that it is controlled by digital information. Therefore, a wide variety of operating speeds of the sewing machine are available, which are only limited by the maximum operating capacity of the sewing machine itself. Furthermore, when stopping the low-inertia motor of the sewing machine mentioned above, there is no need to apply a mechanical brake. It has the great advantage of being able to be stopped. In this case, as described above, the polarity of the signal to be applied to the motor is determined by the transistor 79.
Alternatively, either one of 80 may be made conductive.

Next, the operation of the control device that completely controls the low inertia motor in the sewing machine with the above configuration will be explained in the following cases: a) when increasing the speed of the motor, b) when decelerating the motor, c) when When stopping the motor.

A) Speed increase When the higher-level control device 46 tries to start the motor 12, the control device 46 starts the D/A converter 47.
A binary code signal suitable for setting the speed up is applied to the D/A converter 47, and a speed deviation signal is sent to the output terminal of the D/A converter 47, and this deviation signal is applied to the speed control device 44. . This speed control device 44 drives the motor 12, and the speed of the motor 12 is adjusted to a speed determined by the above-mentioned binary code signal applied from the above-mentioned control device 46, that is, the main processing unit. It acts until it is reached. At this time,
A feedback signal from block 48 indicating the driving state of motor 12 informs controller 46 whether motor 12 has reached a preselected speed.

B) Deceleration When the speed corresponding to the binary code signal applied to the D/A converter 47 is lower than the actual speed of the sewing machine, there is a negative deviation between the terminals of the motor 12. The applied voltage will be reversed, and then the speed of the motor 12 will be
When the desired low speed is reached, the voltage reversal condition is eliminated.

As in the case of speed increase, a feedback signal sent from block 48 indicating the driving state of the motor 12 informs the controller 46 whether the motor 12 has reached the commanded low speed. It's becoming like that.

C) Stopping the motor The device is set to the lowest sewing speed according to the deceleration procedure described above, and when this state is reached, it is brought into the operating state approaching the stop position, and the motor 12 approaches the stop position. This control device operates to achieve the final deceleration, and then, when the absolute position is achieved, the output of the D/A converter 47 becomes zero. The motor 12 stops.

The sewing machine configured as described above can be used in a normal method or a fully automatic method.
This frees the operator from controlling the number of stitches in the sewing operation, the movement speed of the sewing needle, and other various variables that should be controlled when sewing the fabric. As mentioned above, since the entire machine is automated by using means to control the various components of the sewing machine using a microprogram method, the operator can easily select and operate the sewing machine using a keyboard. Various sewing tasks can be performed, and various parameters for each sewing task can be introduced in order to effectively operate the sewing machine. The role of all these parameters is to completely control the sewing machine using appropriate information that is issued as a control command based on information stored in the computer of the control device.

This complementary construction of a sewing machine with a low inertia motor and its speed control is thus very useful in the textile industry.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a sewing machine according to an embodiment of the present invention, FIG. 2 is a diagram showing a specific configuration of the main components of the sewing machine, and FIG. 3 is a block diagram of the main processing unit of the sewing machine. The circuit diagram, FIG. 4 is a block diagram showing the control system of the sewing machine, FIG. 5 is a block diagram showing the specific configuration of the speed control section of the sewing machine, and FIG. 6 is a block diagram showing the specific configuration of the speed control section of the sewing machine. The specific control circuit diagram, Figure 7, is
A control circuit diagram for controlling the rotational direction of the motor of the sewing machine, FIG. 8 is a circuit diagram of a power feeding stage for driving the motor of the sewing machine, FIG. 9 is a power supply circuit diagram for the sewing machine, and FIG. 10 11 is a plan view showing the outline of the configuration of the control panel of the sewing machine, FIG. 11 is an electric circuit diagram for controlling the operating pedal of the sewing machine, and FIG. 12 is a circuit for detecting needle thread breakage of the sewing machine. 13 are circuit diagrams showing a specific example of the synchronization circuit shown in FIG. 1. 1...Microprocessor (main processing unit),
2... Clock circuit, 3... Dynamic computer (RAM),
4... Static computer (ROM), 5... Logic/
Analog converter, 6... Synchronization block, 7... Sewing machine body, 8... Block including safety circuit for upper thread trimming device, 9... Operating pedal, 10... Electronic block,
11...Keyboard, 12...Low inertia motor, 13...
Control block, 14... Microprocessor (main processing unit), 15... EPROM type computer block, 16... RAM type computer block, 20... CTC block, 22, 23
...Decoder, 25...Control panel (control panel), 26
...Button switch for end/stop command, 27...Power supply circuit, 28, 29..., 32...Electric valve, 38...
Processing circuit, 40...displacement recorder, 41...JK
Flip-flop, 42...Numeric display device, 44...
Speed control device, 45...Coupling interface, 46...Block (main processing unit), 47...D/A converter (D/A controller), 48...Feedback block, 49...Electronic tachometer, 50, 51... Block, 52... First AD/DC converter, 53... Control DC/AC converter, 54... Second AC/DC converter,
57... Feedback circuit, 59... Feedback circuit, 64... Transformer, 67, 68... Operational amplifier, 72... Delay step circuit, 81... Integrated circuit, 79, 80... Transistor for controlling rotational direction of motor, 84... Motor drive Control block, 93...Transformer, 96,
97...Stitch selection switch.

Claims (1)

[Claims] 1. A sewing machine combining a programmable control and a low inertia motor, which is connected to two memory means, a static computer memory means and a dynamic computer memory means, and a plurality of photoelectric motors. A micro-programmed machine constitutes a microprocessor connected to three input/output units that exchange information with sensors, end-of-stroke position detection elements, multiple electric valves, and other peripheral components of the sewing machine. a higher-level control device, a digital-to-analog converter controlled by microprogrammed signals of the control device, and an electronic control device receiving signals from the digital-to-analog converter; As a mechanical part, the low inertia motor is controlled by the electronic control device, and works together with an electronic tachometer device electrically connected to the speed control device, and the speed control device includes: The adjustment stage includes an adjustment control stage and a power distribution stage, and the adjustment stage receives a signal representing the rotation speed from a rotation feedback circuit, a signal representing the magnitude of the driving state of the low inertia motor from the feedback circuit, and receives a signal representing the driving state of the low inertia motor. The power distribution stage is configured to receive a reference signal from a control device, and the adjustment control device is adapted to apply a signal representing an operating state to a coupling interface connected to the host control device. an AC/DC converter, and a control DC/AC converter having an operating characteristic of a frequency of 20KC/S connected to the first AC/DC converter; a transformer having a ferrite core connected to the secondary side of the transformer; and a second transformer connected to the secondary side of the transformer and connected to supply power to the low inertia motor.
and a DC/AC converter; The adjustment control stage always performs a comparison operation on its input signals using an operational amplifier, and sends a signal representing the comparison result to the first output terminal. The above control has operating characteristics with a frequency of 20KC/S.
A pair that controls the DC/AC converter and sends the signal to the second output terminal to cooperate with the feedback circuit of the low inertia motor and correspond to the polarity of the rotational direction of the low inertia motor. A programmable sewing machine using a low inertia motor, characterized in that it is controlled to make one of the transistors conductive. 2 The motor is powered through three current conversion stages, the first current conversion stage is an AC/DC conversion stage that converts 50C/S AC to DC; the second current conversion stage converts DC to 20KC/S. As a DC/AC conversion stage to convert S to AC; 3rd
A sewing machine combining programmable control and a low inertia motor according to claim 1, wherein the current conversion stage is an AC/DC conversion stage that converts 20KC/S alternating current to direct current. 3 The above DC/ having operating characteristics of frequency 20KC/S
The AC control converter includes an integrated circuit that receives the speed control signal sent from the regulating control stage as the only input signal and has a pulse width corresponding to the input signal and that has pulse widths that overlap each other. Generates two series of pulse trains that never occur,
By adding these two pulse trains to the metamorphic block, it has a ferrite core and a frequency of 20K.
Claims 1 and 2 are characterized in that a pair of transistors connected to the primary side of a transformer enabled to operate with C/S are configured to switch at high speed without overlapping each other. A sewing machine that combines programmable control and a low inertia motor as described in Section 1. 4. The adjustment control stage controls the bases of a pair of transistors connected between the input terminals of the low inertia motor, and switches the electrical state at both input terminals of the low inertia motor between conduction and disconnection. A sewing machine combining a programmable control according to any one of claims 1 to 3 with a low inertia motor.