JP2004121281A - Power controller for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine which minimizes the power consumption even in a sewing machine with a multi-functional unit. <P>SOLUTION: In the functional unit not used for the sewing carried out by driving a needle and a feeding means equipped in the main body of the sewing machine, the energy-saving sewing machine is made possible by restricting the current to be supplied to a stepping motor, a driver circuit and a detection sensor which are actuated in relation to the control of the functional units during the non-operation period of the functional unit. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic upper thread hooking unit, an automatic lower thread winding unit, an automatic upper thread winding unit, an embroidery device, and other functional units that are not used for sewing performed by driving a needle and a feeding means provided on a sewing machine main body. The present invention relates to a novel sewing machine power supply control device that limits a current supplied to a stepping motor and a detection sensor that operate in connection with control.
[0002]
[Prior art]
As a functional unit not used for sewing performed by driving a needle and a feeding means provided in a conventional sewing machine main body, there is, for example, an embroidery apparatus described in JP-A-2000-157768.
When performing straight stitching and zigzag stitching with this sewing machine, a sewing machine motor that moves the needle up and down, a stepping motor for feeding means driving, and a needle for driving a needle and a feeding means (feed dog) provided on the sewing machine main body. It is configured to operate a needle swing stepping motor and use a timing sensor for detecting a rotation angle of a main shaft in order to detect a drive timing of these motors.
[0003]
When performing embroidery sewing with the sewing machine, an embroidery device is mounted on the sewing machine main body, and a sewing machine motor for moving a needle provided on the sewing machine main body up and down, and XY feeding means for feeding the cloth provided in the embroidery device to XY. Embroidery sewing is performed in cooperation with the above, and a feed means driving stepping motor for driving a feed means provided in the sewing machine main body is not used. The embroidery device is provided with an X pulse motor, a Y pulse motor for driving the XY feed means, an X origin detector, and a Y origin detector. The sewing machine body has a drive circuit for the X pulse motor of the embroidery device, and a Y pulse motor. Drive circuit is provided.
[0004]
[Patent Document 1]
JP 2000-157770 A
[0005]
[Problems to be solved by the invention]
In a conventional sewing machine equipped with a computer that causes a stepping motor to perform a predetermined operation while judging detection signals of various sensors, when a power switch of the sewing machine main body is turned on, all the stepping motors in the main body are immediately turned on. A standby current is supplied to the drive circuit after detecting the origin, and a photo interrupter that combines a light emitting diode and a photo sensor, such as a timing sensor that detects the rotation angle of the spindle, turns on this light emitting diode. Current is always supplied.
[0006]
Thus, the computer determines that the drive circuit and the sensor are in a normal standby state, and accepts an instruction from the operator. When the operator instructs the sewing machine to start sewing, the computer can immediately start controlling the various sensors and the motor drive circuit to execute sewing.
[0007]
However, in the conventional example, the drive current for the X-pulse motor and the drive circuit for the Y-pulse motor of the embroidery device provided in the sewing machine main body have the same standby current as the other drive circuits when the power is turned on as described above. However, the drive circuit actually operates only after the embroidery device is mounted on the sewing machine and the drive circuit and the stepping motor are electrically connected by the connector. However, while straight sewing is being performed by the feed teeth of the sewing machine motor and the feed pulse motor provided on the sewing machine main body, the standby current supplied to the X pulse motor drive circuit and the Y pulse motor drive circuit ( All the power consumption current was wasted because the pulse motor was not connected.
[0008]
As described above, the sewing machine is a functional unit having a stepping motor and a sensor controlled by a computer, and is not used for sewing performed by driving a needle and a feeding means provided on the sewing machine main body. Such functional units are increasing along with the sophistication of products.
[0009]
If a standby current or a detection current is constantly supplied to all the stepping motors and sensors to a sewing machine equipped with such a large number of functional units, a considerable amount of power is required. However, there is a possibility that the power consumption will increase and the product image will deteriorate.
In addition, the above standby current supplied to the pulse motor is composed of a constant current circuit by chopping drive. If there are many stepping motors, this standby current alone may cause radiation noise and affect communication equipment. There is.
[0010]
The present invention relates to a functional unit which is not used for sewing by driving a needle and a feeding means provided in a sewing machine main body, and supplies a stepping motor, a driver circuit, and a detection sensor which operate in connection with control of the functional unit. An object of the present invention is to provide an energy-saving sewing machine by limiting the current to be supplied when the functional unit is not operated.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the power supply control device for a sewing machine according to the first aspect of the present invention, the power supply switch for turning on / off a main power supply of the sewing machine, and a needle and a feeding means provided on a sewing machine main body are driven. A stepping motor or a detecting means that is operated in connection with the control of the functional unit, and reads a detection signal from the detecting means and controls a driving circuit that drives the stepping motor. Control means for executing a predetermined function, and starting means for activating the functional unit, and after detecting the start operation of the activating means after the power switch is turned on, detects the origin of a stepping motor, or A standby current is supplied to the motor drive circuit or a detection current is supplied to the detection means. Those having a power control means for performing.
[0012]
The power supply control device for a sewing machine according to claim 1 is a functional unit that is not used for sewing performed by driving a needle and a feeding means provided on a sewing machine main body, and a stepping motor that operates in connection with control of the functional unit. The current supplied to the detection sensor is not supplied when the power switch is turned on, but is supplied after the start-up operation has been performed on the functional unit. And a sewing machine with high energy saving effect can be obtained.
[0013]
In the power supply control device for a sewing machine according to claim 2 of the present invention, the power supply control unit has a common line for supplying a standby current to a drive circuit of the stepping motor and a line for supplying a detection current to a detection unit, The current is supplied to this line by common switching means.
[0014]
In the power supply control device for a sewing machine according to the second aspect, the standby current supply line and the detection current supply line for the functional unit can be turned on / off by a common switching unit, so that the configuration and control can be simplified.
[0015]
In the power supply control device for a sewing machine according to claim 3 of the present invention, the power supply control means stops supplying current to the drive circuit or the detection means when detecting the end of the operation of the functional unit.
The power supply control device for a sewing machine according to the third aspect has an effect of obtaining a further energy-saving sewing machine by stopping the current supply at the end of the operation of the functional unit.
[0016]
In the power supply control device for a sewing machine according to claim 4 of the present invention, the power supply control means detects the origin of the stepping motor when the power switch is turned on, and waits for the stepping motor and its drive circuit when the detection of the origin is completed. This stops the supply of current.
[0017]
According to a fourth aspect of the present invention, there is provided a power supply control device for a sewing machine, wherein the origin of the stepping motor mounted on the functional unit may be shifted when the sewing machine is carried. Since the power supply can be started up quickly at the time of operation and the current supply is stopped after the detection of the origin, there is an effect that unnecessary power can be prevented from being consumed until the start-up operation is performed on this functional unit.
[0018]
In the power supply control device for a sewing machine according to the fifth aspect of the present invention, the functional unit is an embroidery device that is electrically detachable through a sewing machine and a connector. The embroidery device includes at least an embroidery frame holding a cloth. The sewing machine body includes an X stepping motor for feeding cloth to Y, a Y stepping motor, and a detection unit. The sewing machine body includes a drive circuit connected to the XY stepping motor and the connector. When the embroidery device is not mounted on the main body, the power supply control means does not supply a standby current to the drive circuit.
[0019]
According to a fifth aspect of the present invention, when the power switch is turned on and the embroidery device is not mounted on the sewing machine, the standby current is supplied to the drive circuit for driving the XY stepping motor provided on the sewing machine body. With such a configuration, there is an effect that unnecessary power consumption until the sewing machine performs the embroidery stitching can be prevented.
[0020]
In the power supply control device for a sewing machine according to claim 6 of the present invention, a line that supplies a standby current to a drive circuit of a plurality of functional units having similar operation states or a line that supplies a detection current to a detection unit is shared. The current is supplied to this line by common switching means.
The power supply control device for a sewing machine according to claim 6 has an effect that a simple configuration and control can be performed by sharing a power supply restriction operation for functional units having similar operation states.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a power supply control device for a sewing machine according to the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a control block diagram of a power control device for a sewing machine according to the present invention, and FIG. 2 is a flowchart of the present invention.
[0023]
Reference numeral 1 denotes a controller for inputting / outputting signals to / from all motors and sensors (detection means) provided in the sewing machine main body and motors and sensors provided in a unit including an embroidery device mounted on the sewing machine main body. CPU.
[0024]
Reference numeral 2 denotes a memory output stage including a ROM for storing an operation program, sewing data, display data, and an initial value for the CPU and outputting it to the CPU 1, and a RAM for rewritably storing an arbitrary value.
[0025]
Reference numeral 3 denotes a first stepping motor. The first stepping motor serves as a motor for driving a needle provided on the sewing machine main body and a cloth feed tooth serving as a feeding means, for example, vertically moving a needle provided on the sewing machine main body. Sewing machine motor, a needle swing stepping motor for swinging the needle, and a feeding means driving stepping motor for driving the feeding means.
[0026]
Reference numeral 4 denotes a first driver circuit (drive circuit) for driving the first stepping motor 3, which is connected to the CPU 1.
[0027]
Reference numeral 5 denotes a first sensor for outputting a detection signal to the CPU. The first sensor includes a needle provided on the sewing machine main body and a needle for controlling the stepping motor 3 for driving the cloth feed dog. And a sensor for detecting the origin of the stepping motor 3 and the like. These sensors are constituted by photointerrupters in which a light emitting diode and a photosensor are combined, and detect the passage of the detected member and output a detection signal to the CPU.
[0028]
The sewing machine according to the present invention is configured such that the stepping motors 3 cooperatively drive at a predetermined timing to form a linear pattern or a zigzag pattern in response to an output signal of the timing sensor 5 for detecting the spindle. Have been.
[0029]
Reference numeral 6 denotes a first activation switch for performing sewing using a needle and a feed unit provided in the sewing machine main body, and a pattern selection unit and a feed pitch setting unit are omitted.
[0030]
Reference numeral 7 denotes a functional unit which is not used for sewing performed by driving a needle and a feeding means provided in the sewing machine main body, and includes all stepping motors which operate in connection with control of the functional unit.
This functional unit includes an embroidery device, an automatic upper thread hooking unit, an automatic upper thread winding unit, an automatic lower thread winding unit, and the like.
[0031]
An embroidery device, which is one of the functional units, is detachable from the sewing machine, and an X stepping motor and an X origin detection sensor provided on an X feed member as XY feed means for an embroidery frame holding a cloth inside the embroidery device, A Y stepping motor provided on the Y feed member and a Y origin detection sensor are provided.
[0032]
The embroidery device further includes three sensors for detecting three sizes, large, medium, and small, of the embroidery frame supported by the XY feeding means, a detection switch that switches when the embroidery frame is mounted on the sewing machine, and XY stepping when the embroidery device is mounted. A switch for protecting a motor driver circuit is provided. The sewing machine body and the embroidery device are electrically connected by a connector, the XY stepping motor of the embroidery device is connected to each driver circuit of these motors in the sewing machine body, and all the sensors and switches of the embroidery device and the CPU 1 of the sewing machine body are connected. And are connected.
[0033]
When the embroidery device is mounted on the sewing machine and the power switch is turned on, the detection switch for detecting the mounting of the embroidery device detects the embroidery device, and the sewing machine main body switches from the practical sewing mode to the embroidery sewing mode. When the sewing machine main body enters the embroidery sewing mode, the sewing machine main body switches to an embroidery sewing pattern selection screen and a selection switch, and an edit screen and an edit switch. At the time of sewing, the stepping motor for driving the feed means of the sewing machine main body is stopped, and the embroidery sewing is stopped. An XY stepping motor that drives a feeding means in the apparatus is operated.
[0034]
This detection switch is a second start switch (10) to be described later in order to instruct the CPU 1 in advance that the sewing machine main body is set to the embroidery mode and the XY stepping motor is operated.
The operator selects and edits the embroidery pattern on the sewing machine main body, turns on a start switch as a start / stop switch, the sewing data of the selected embroidery pattern is read from the storage means, and the sewing machine motor of the sewing machine main body is driven to drive the spindle. The needle circuit is rotated to move the needle up and down, and the driver circuit of the XY pulse motor is controlled in accordance with the sewing data in synchronization with the rotation of the spindle detected by the timing sensor, and the XY stepping motor of the embroidery device is operated to perform embroidery sewing. Is
[0035]
Further, the automatic upper thread hooking unit of the sewing machine, which is one of the functional units, allows the operator to hold the upper thread pulled out from the thread spool on the transfer body moved to a predetermined position on the upper side of the sewing machine. When the start switch is turned on, the CPU 1 drives the automatic upper threading stepping motor to lower the transfer body to the sewing needle. By the lowering of the transfer body, the upper thread is threaded on the automatic thread tensioner and the balance, and the automatic threader passes the upper thread through the needle hole in conjunction with the transfer body. When the threading is completed, the transfer body releases the upper thread and moves again to a predetermined position on the upper portion of the sewing machine. At this time, the drive of the automatic upper threading stepping motor is stopped by detecting a predetermined position on the upper portion of the sewing machine by the position sensor and sending a detection signal to the CPU 1.
[0036]
In addition, the automatic upper thread winding unit, which is one of the functional units, sets a plurality of differently colored thread spools on a thread stand of a sewing machine in advance when sewing with a plurality of color threads like embroidery sewing, and This is a device that rewinds a thread passed through a needle at the time of replacement to a bobbin. When the operator turns on the start switch to change the color thread, a sensor determines which thread spool the winding stepping motor is connected to.
[0037]
At this time, if not connected to the thread spool to be wound, the switching stepping motor is driven to connect the drive shaft of the thread spool for winding the thread and the stepping motor for winding, and then the stepping motor for winding. Is driven to rotate the thread spool and take up the thread. At this time, in order to stop at the yarn end holding position of the automatic upper yarn winding unit before the end of the wound upper yarn is transferred to the yarn spool, the upper yarn being wound is detected by the yarn end sensor and wound. The stepping motor is stopped.
[0038]
When the CPU 1 detects that the sewing with the color thread at the position is completed and the sewing with the next color thread has started at the time of embroidery sewing, the automatic upper thread winding unit automatically starts the automatic upper thread winding unit by using this as a start switch. You may do so. Further, by installing the automatic upper thread winding unit and the automatic upper thread hooking unit in combination with the embroidery sewing machine, it is possible to realize a system capable of automatically changing color threads at the time of embroidery sewing.
[0039]
An automatic bobbin winding unit, which is one of the functional units, is a device for automatically winding a bobbin thread on a bobbin set in a shuttle of a sewing machine. Open the opening / closing window beside the needle plate, hook the thread end pulled out from the thread spool for the lower thread on the thread holding plate, and when the bobbin thread remaining amount sensor detects that the bobbin thread wound on the bobbin has run out. The worker is notified, and the worker operates an automatic bobbin winding switch as a start switch.
[0040]
The CPU 1 detects that the opening / closing window is closed by a sensor, and then moves the thread holding plate to the bobbin by the stepping motor for transferring the thread holding plate, and sets the gear so as to transmit the rotation of the shuttle to the bobbin. set. Next, the sewing machine motor is rotated to wind a thread around the bobbin, and when the bobbin is wound by a predetermined amount, the lower thread winding sensor detects this and stops the sewing machine motor, cuts the thread, and moves the thread holding plate to a stepping motor for transferring the thread holding plate. Is moved to the standby position.
[0041]
When the bobbin runs out of bobbin thread during embroidery sewing, when the bobbin thread remaining amount sensor detects and a detection signal flows to CPU1, CPU1 assumes that the start switch has been turned on. The automatic bobbin winding control may be automatically started.
[0042]
Reference numeral 8 denotes a second driver circuit (drive circuit) that drives all the stepping motors 7 described in the description of each functional unit, and is connected to the CPU 1.
[0043]
Reference numeral 9 denotes a second sensor including all the sensors described in the description of each of the functional units, including all sensors such as an origin detection sensor provided in each of the functional units, and outputs a detection signal to the CPU 1. This sensor is constituted by a photointerrupter in which a light emitting diode and a photosensor are combined, and detects passage of a detected member and outputs a detection signal to the CPU 1. In addition to using the photointerrupter as a sensor for detecting the position of the detected member, a limit switch may be used. In this case, an on / off signal of the limit switch is output to the CPU 1.
[0044]
Reference numeral 10 denotes a second start switch including all the start switches described in the description of each of the functional units. The second start switch is operated manually, and the second start switch includes a state that the embroidery device is mounted on the sewing machine like the embroidery device. Some sensors switch on automatically depending on the sensor they detect.
[0045]
Reference numeral 11 denotes a power switch provided on the sewing machine main body. When the power switch 11 is turned on, the power supply circuit 12 starts to be energized to apply a reference voltage to the CPU 1 and to light-emitting diodes of the sensors 5 and 9 and a photo diode. Detection currents A and B are passed through the sensors, and standby currents are supplied to the driver circuits 4 and 8. In addition, the hand light of the sewing machine and the backlight of the liquid crystal display device are turned on. Then, the CPU is activated to start sewing machine control described later.
[0046]
Reference numeral 20 denotes a first current changeover switch as a power supply control unit for turning on and off a standby current C of the second driver circuit, and reference numeral 30 denotes a power supply control unit for turning on and off a detection current B supplied to a light emitting diode of the second sensor. This is a second current switch. The first and second current changeover switches 20 and 30 have FETs 21 and 31 arranged on respective current supply lines, and these FETs 21 and 31 are turned on and off by a current changeover signal output from CPU 1 via switching transistors 22 and 32. Switches.
[0047]
Next, the operation of the sewing machine will be described with reference to the flowchart shown in FIG.
When the power switch of the sewing machine is turned on (S1), current is supplied to the first stepping motor 3, the first driver circuit 4, and the first sensor 5 used for sewing performed by driving the needle and the feeding means provided on the sewing machine main body. Supply (S2).
[0048]
That is, each driver circuit as the first driver circuit 4 for driving the feed stepping motor and the needle swing stepping motor as the first stepping motor 3 is driven, and the origin is detected by each origin detection sensor as the first sensor 5. Thereafter, a standby current is supplied to a driver circuit for driving these stepping motors, and a detection current is also supplied to a light-emitting diode of a photo-interrupter, which is an origin detection sensor, so that detection is always possible. In addition, since a timing sensor as the first sensor 5 for detecting the rotation angle of the main shaft is also used for the sewing, a detection current is supplied to the light emitting diode of the photointerrupter so that the detection can be always performed.
[0049]
A second stepping motor 7 mounted on an automatic needle threading unit or the like as a functional unit other than an embroidery device, which is not used for sewing performed by driving a needle and a feeding means provided in the sewing machine main body, and the second stepping motor The standby current C supplied to the second driver circuit 8 for driving the motor 7 is turned off by the first current switch 20, and the detection current B supplied to the second sensor 9 is also turned off by the second current switch 30. .
[0050]
Further, it is determined whether or not the embroidery device is mounted on the sewing machine as the functional unit (S3). When the embroidery device is not mounted, a function that is not used for sewing performed by driving a needle and a feeding means provided on the sewing machine main body. As a unit, the standby current (power consumption current) C supplied to the second driver circuit 8 for driving the XY stepping motor of the embroidery device provided in the sewing machine main body is turned off by the first current switch 20 (S4). Then, the sewing machine is put into a practical sewing mode (S5), and a straight stitch pattern or a zigzag sewing pattern can be selected (S6), and a stitch is formed by a feed means using a feed dog provided on the sewing machine main body, a vertical movement of a needle, and a needle swing. (S7).
[0051]
When the detection switch detects that the embroidery device is mounted on the sewing machine as the functional unit (S3), the CPU 1 determines that the second activation switch 10 has been turned on, and the first current switching switch. Turn on 20. Thus, the standby current C flows through the second driver circuit 8 provided in the sewing machine main body, and the standby current is supplied from the second driver circuit 8 to the XY stepping motor of the embroidery apparatus through the connector.
[0052]
Further, the second current switch 30 is turned on so as to supply the detection current B to the XY origin detection sensor as the second sensor 9 provided in the embroidery device and the three sensors for detecting the size of the embroidery frame (S8). ). Thus, the X stepping motor provided on the X feed member is driven to detect the origin by the X origin detection sensor, and the Y stepping motor provided on the Y feed member is driven to detect the origin by the Y origin detection sensor.
[0053]
The sewing machine main body switches from the practical sewing mode to the embroidery sewing mode (S9). When the sewing machine main body enters the embroidery sewing mode, the sewing machine main body switches to the embroidery sewing pattern selection screen and the selection switch, and the edit screen and the edit switch (S10). When the sewing is started by operating the start / stop switch of the sewing machine (S11), the selected and edited sewing data is sequentially read out from the storage means, the sewing machine motor is started, the needle moves up and down, and the sewing machine main body is moved. The stepping motor for driving the feeding means is stopped, and the XY stepping motor for driving the feeding means in the embroidery device is operated (S12, S13).
[0054]
As described above, when the sewing machine main body is in the practical sewing mode or the embroidery sewing mode, the second start switch 10 of the functional unit except the embroidery device, which is not used for sewing performed by driving the needle and the feeding means provided on the sewing machine main body, is provided. When turned on, the CPU 1 starts interrupt control by this ON signal (S14).
[0055]
The CPU 1 turns on the first current changeover switch 20 to supply the standby current C to the second stepping motor 7 provided in the turned on functional unit and the second driver circuit 8 for driving the second stepping motor 7, The second current switch 30 is turned on so as to supply the detection current B to the second sensor 9 provided in this functional unit (S15). Thus, the second stepping motor 7 of this functional unit detects the origin under the control of the CPU 1 (S16), and executes the function according to a predetermined program while determining the detection signal of the second sensor 9 (S17, 18).
[0056]
Next, a second embodiment of the present invention will be described with reference to the block diagram shown in FIG. FIG. 3 corresponds to a block diagram of the functional unit of FIG. This functional unit includes a second stepping motor 7, a second driver circuit 8 for driving the second stepping motor 7, and a second sensor 9 as described above. Then, a first current switch 20 for supplying or stopping the standby current C to the second stepping motor 7 and the second driver circuit 8 for driving the second stepping motor 7 is provided, and the detection current B is supplied to the second sensor 9. A circuit is shared with the second current selector switch to be supplied, and a current limiting resistor 40 is connected between the first current selector switch 20 and the second sensor 9. This has the effect of reducing the number of components of the current switch and reducing the current consumption.
[0057]
Next, a third embodiment of the present invention will be described with reference to the block diagram shown in FIG. FIG. 4 corresponds to a block diagram of the functional unit of FIG. 1. In the first embodiment shown in FIG. 1, the second stepping motor 7 and the driving of the second stepping motor 7 are provided for each functional unit. A second driver circuit 8 and a second sensor 9 are provided, and a first current switch 20 and a second current switch 30 are provided for each functional unit. Then, only the current changeover switch corresponding to the functional unit for which the second start switch 10 was operated was turned on, and the functional unit became executable.
[0058]
However, in the third embodiment, when a plurality of functional units having similar operation states are provided in the sewing machine, the activation operations of those functional units are performed at substantially the same time. For example, the sewing machine is provided with an automatic needle thread winding unit and an automatic needle thread winding unit. When the embroidery device is mounted and in the embroidery mode, when the color thread is changed during embroidery sewing, the automatic needle thread sewing unit and the automatic needle thread winding unit are provided. Are activated substantially simultaneously or continuously.
[0059]
Therefore, the current changeover switch 20 and the current changeover switch 30 of the functional unit are shared, and the current changeover switch of each functional unit is also shared. For example, the standby current C and the detection current B of two functional units are turned on / off by one current changeover switch. Also, the automatic bobbin winding unit is started in response to a bobbin thread break during embroidery stitching, so that the unit is shared with the current changeover switch of this unit. This simplifies the control program for the current changeover switch for each functional unit, and has the effect of contributing to a reduction in the number of components.
[0060]
Next, a fourth embodiment of the present invention will be described.
There is a possibility that the origin position of the stepping motor mounted on the functional unit may be shifted when carrying the sewing machine. For example, a transfer body driven by a stepping motor, such as the above-described automatic upper thread hooking unit, is configured by a member that moves long in the vertical direction. With such a configuration, it is possible to start up quickly when the functional unit is started up by detecting the origin in advance when the power is turned on.
[0061]
Therefore, when the power is turned on, the first and second current changeover switches are turned on, and the origin circuit is operated by operating the driver circuit for the stepping motor while detecting the origin by the origin sensor. After the origin detection, the first and second current changeover switches are turned off, and the supply of the standby current C of the driver circuit to the stepping motor and the supply of the detection current supply B to the photo interrupter of the origin sensor are stopped. When the start switch is operated for this functional unit, the first and second current changeover switches are turned on again to perform the operation as a normal functional unit. This has the effect of preventing wasteful power consumption until the functional unit is started.
[0062]
【The invention's effect】
As described above, the sewing machine power supply control device according to claim 1 of the present invention is a functional unit that is not used for sewing performed by driving a needle and a feeding means provided on a sewing machine main body. By limiting the current supplied to the stepping motor, the drive circuit, and the detection sensor that operate in connection with the control when the functional unit is not in operation, it is possible to reduce wasteful power consumption and achieve a high energy-saving sewing machine. Can be.
[Brief description of the drawings]
FIG. 1 is a control block diagram of a power supply control device of a sewing machine according to the present invention.
FIG. 2 is a flowchart of FIG.
FIG. 3 is a main block diagram showing a second embodiment.
FIG. 4 is a main block diagram showing a third embodiment.
[Explanation of symbols]
1 CPU
3 1st stepping motor
4 First driver circuit (drive circuit)
5 First sensor (detection means)
6 First start switch
7 Function unit second stepping motor
8 Second driver circuit (drive circuit) for functional unit
9 Second sensor (detection means) of functional unit
10 Second activation switch of functional unit
11 Power switch
20 1st current changeover switch (power control means)
30 second current switch (power control means)

Claims (6)

A power switch for turning on / off the main power of the sewing machine;
A function unit not used for sewing performed by driving a needle and a feeding means provided in a sewing machine main body, and a stepping motor or a detection means operating in connection with control of the function unit and a detection signal from the detection means. Control means for reading and executing a predetermined function by controlling a driving circuit for driving the stepping motor;
Starting means for starting the functional unit,
After the power switch is turned on, when the starting operation of the starting unit is detected, the starting point of the stepping motor is detected, or a standby current is supplied to a driving circuit of the stepping motor, or at least a detection current is supplied to the detecting unit. A power supply control device for a sewing machine, comprising a power supply control means for executing any one of the power supply control means. The power control unit may share a line for supplying a standby current to the drive circuit of the stepping motor and a line for supplying a detection current to the detection unit, and supply a current to this line by a common switching unit. The power supply control device for a sewing machine according to claim 1. 3. The power supply control device for a sewing machine according to claim 1, wherein the power supply control means stops supplying current to the drive circuit or the detection means when detecting the end of operation of the functional unit. The power supply control means detects the origin of the stepping motor when the power switch is turned on, and stops supplying standby current to the stepping motor and its drive circuit when the detection of the origin is completed. A power supply control device for a sewing machine according to any one of the above. The functional unit is an embroidery device that is electrically detachable through a sewing machine and a connector. The embroidery device includes an X-stepping motor and a Y-stepping motor for feeding at least an embroidery frame holding a cloth to the XY cloth, and detection means. And a drive circuit connected to the XY stepping motor and the connector through the connector. When a power switch is turned on and the embroidery device is not mounted on the sewing machine body, the power supply control is performed. The power supply control device for a sewing machine according to any one of claims 1 to 4, wherein the means does not supply a standby current to the drive circuit. A line for supplying a standby current to a drive circuit of a plurality of functional units having similar operation states or a line for supplying a detection current to a detection unit is shared, and a current is supplied to this line by a common switching unit. The power supply control device for a sewing machine according to claim 1.

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