JPS6340112B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a sewing machine, and more particularly to a sewing machine equipped with a mechanism that can adjust the amplitude of a sewing needle according to the amount of operation of a foot controller. .

Prior Art In the sewing work of a sewing machine, especially in the case of embroidery sewing work, when the feed dog descends, the workpiece cloth is fed in an arbitrary direction by hand in order to form the desired stitch pattern, and the workpiece cloth is It is necessary to arbitrarily change the amplitude of the sewing needle as the needle is fed. However, conventional sewing machines with a zigzag stitch function are equipped with an adjustment dial on the front of the machine frame that can set the desired amplitude of the sewing needle.
It has been difficult for a worker, who has to delicately feed the work cloth with both hands, to change the amplitude of the sewing needle by operating the adjustment dial. If the adjustment dial is operated with one hand and the work cloth is fed with one hand, the stitch pattern will be disordered.

On the other hand, for example, a switch device with a first position for powering off, a second position for powering on, and a third position for mode switching is operated, and is normally used as a foot pedal for controlling the speed of the sewing machine motor. A sewing machine is conceivable in which the mode of the operating body is switched to adjust the amplitude of the needle as necessary, and the mode is displayed at all times, so that the amplitude of the sewing needle can be adjusted using the foot operating body during sewing. ing. In such sewing machines, the power supply is turned off to prevent unconscious mode switching if the user accidentally moves to the third position when moving from the first position to the second position.
It is set so that the mode switching of the foot operation body becomes effective only after a certain period of time has elapsed after the switch is turned on.

Problems to be Solved by the Invention However, for example, when the mode of the foot operating body is set to amplitude adjustment with the intention of performing embroidery sewing from the beginning, if the mode is intentionally switched to the third position immediately after the power is turned on, Since the mode of the foot control unit cannot be switched to amplitude adjustment until a certain period of time has passed after the power is turned on, it is necessary to confirm that the mode has been switched one by one using the display, which is cumbersome. Moreover, if this confirmation is neglected, the foot operating body may be operated in an unintended mode, and there is a risk that accurate stitch formation may not be obtained. Moreover, in such conventional sewing machines, when switching the mode of the foot operating body, the switch device must be operated to the third position, which is cumbersome.

Purpose The present invention has been made against the background of the above circumstances, and its purpose is to provide a mechanism for arbitrarily changing the amplitude of the sewing needle while feeding the work cloth using both hands. To provide a sewing machine capable of accurately and easily embroidering and sewing.

SOLUTION To achieve such objects, the present invention provides: (a) a sewing machine motor operatively connected to a needle capable of vertically reciprocating and lateral oscillating movements and operable to set the speed of the sewing machine motor; A manual operating body provided on the sewing machine frame, a speed control circuit for controlling the speed of the sewing machine motor to a desired speed, and needle position information for controlling the horizontal swing position of the needle. A sewing machine comprising: an information generating circuit that generates information in synchronization with the up-and-down reciprocating movement; and a needle positioning drive mechanism that positions the needle in accordance with needle position information supplied from the information generating circuit. b) one foot operating body that can be depressed over a predetermined range; and (c) a variable speed controller for controlling the speed of the sewing machine motor in relation to the amount of operation of the foot operating body. A command signal generation circuit that can alternatively generate a speed command signal and a constant speed command signal for controlling the speed to a predetermined constant speed according to the operation of the manual operating body.

(d) a first connection circuit for connecting the foot operation body to the information generating circuit so that the needle position information supplied to the needle positioning drive mechanism can be adjusted according to the amount of operation of the foot operation body; (e) a second connection circuit for connecting the foot operation body to the command signal generation circuit so that a variable speed command signal is generated from the command signal generation circuit; (f) the foot operation body; An operating body is removably provided on the sewing machine frame, and is individually connected to the first and second connection circuits for selectively operating one of the first and second connection circuits. and two connection terminals, and the speed of the sewing machine motor is controlled in accordance with a constant speed command signal generated from the command signal generation circuit while the first connection circuit is selected. do.

Operation and Effects of the Invention With this arrangement, when the foot operating body is connected to the connection terminal connected to the first connection circuit, the foot operating body is operated by the operation of the first connection circuit. It is connected to an information generation circuit, and the needle position information generated from the information generation circuit is adjusted according to the amount of foot operation of the foot operation body to control the horizontal swing position of the needle, and also outputs a command signal. In the generating circuit, a constant speed command signal is generated, and the speed of the sewing machine motor is controlled to a constant speed according to the operation of the manual operating body. Further, when the foot operation body is connected to the connection terminal connected to the second connection circuit, the foot operation body is connected to the command signal generation circuit by the operation of the second connection circuit. A variable speed command signal is generated in relation to the amount of depression of the foot operation body, and the speed of the sewing machine motor is controlled at variable speed.

Therefore, according to the present invention, when the operator connects the foot operating body to the connection terminal before starting work, the operator selects either one for controlling the swinging position of the needle or for controlling the speed of the sewing machine motor. Since you will inevitably have to select a mode, you may have to check which mode the foot control is switched to when performing embroidery, etc. Compared to conventional sewing machines, which cannot be obtained accurately and sluggish, the operation for switching the foot control device is simpler, and sewing operations such as embroidery and yew stitching can be performed easily and accurately. . Moreover, connecting the foot control body to the connection terminal is normally done before starting work, and when performing this work, the mode of the foot control body can be changed by simply selecting one of the two connection terminals. Since the mode can be switched, there is no need to perform special work for mode switching.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a pillar part erected on a base part 2, and a head part 4 is attached to one end of a sewing machine arm 3.
is provided, and the other end is held horizontally by the pillar section 1. On the front of the sewing machine arm 3, there is a selection push button 5 for selecting and operating a stitch pattern, and a display panel 6 for displaying the selected stitch pattern.
is provided. A start/stop push button 7 for starting and stopping the sewing machine is provided on the front surface of the head 4, and a low speed push button 8 is provided near the pillar 1 of the base 2 for setting the sewing machine motor speed. , a medium speed push button 9 and a high speed push button 10 are provided. Further, on the front surface of the pillar portion 1, an amplitude adjustment dial 12 is provided for setting and operating the horizontal amplitude amount of the sewing needle 11.
and a feed adjustment dial 13 for setting and operating the feed amount of the feed dog. On the lower side of the head 4 is a sewing needle 11 which is reciprocated up and down by a known mechanism and is also made to make an oscillating movement in the lateral direction according to a known needle swinging mechanism driven by a needle position actuator 14. A presser foot 15 is provided at a position close to the sewing needle 11 and presses the work cloth using a known mechanism.

On the other hand, the sewing machine motor 2 is
A foot controller 17, which is a foot operation body having a cord with a plug 16, is provided to set the rotational speed of the needle 5 or the amplitude of the sewing needle 11. A speed adjustment socket 18 and an amplitude amount adjustment socket 19, which are connection terminals, are provided at .
Incidentally, the foot controller 17 has a built-in potentiometer 20 that operates in accordance with the amount of depression and is connected to an electrode of the plug 16.

The sewing machine constructed as described above is equipped with a control circuit shown in the block diagram of FIG.

The central processing unit (hereinafter referred to as CPU) 21 is
Working memory 22 and program memory 23
It works together with the computer to perform arithmetic processing on input data according to a predetermined program, and outputs the result of the calculation as data.

The timing pulse generator 24 generates a timing pulse TP synchronized with the rotation of the main shaft of the sewing machine.
Supplies to CPU21.

The pattern selection device 62 is a device for selecting a desired stitch pattern to be formed by the sewing machine, and displays the selected stitch pattern and also sends a coded pattern signal SM representing the stitch pattern. CPU21
supply to.

The stitch data memory 26 stores all stitch data SD for forming the selected desired stitch pattern, and supplies the stitch data to the CPU 21 based on instructions from the CPU 21. Each piece of stitch data includes a pair of needle position information SN and feed adjuster position information SF that specify the position of each stitch.

Upon receiving the pattern signal SM and the timing pulse TP, the CPU 21 outputs a group of stitch data necessary for forming the desired stitch pattern represented by the pattern signal SM into a timing pulse according to a predetermined program.
The stitch data is read out sequentially from the stitch data memory 26 in synchronization with TP, and at the same time, the regulator position information is sent to the D/A converter 27 as SF, and the needle position information is sent to the D/A converter 28.
Supply SN respectively.

The D/A converter 27 converts feed adjuster position information SF, which is a code signal, into a feed position signal, which is a voltage signal.
It is converted into SFA and supplied to the sending drive circuit 30 via the resistor 29. The feed drive circuit 30 supplies power to the feed actuator 31 that drives the feed adjuster so as to position the feed adjuster at the position represented by the feed position signal SFA. but,
A variable resistor 32 interlocked with the feed adjustment dial 13 is connected between the input terminal of the feed drive circuit 30 and the ground power terminal, and the feed position signal is
The voltage of SFA is adjusted by a resistor 29 and a variable resistor 32. That is, by operating the feed adjustment dial 13, the position of the feed adjuster can be arbitrarily adjusted, and the feed amount of the work cloth can be adjusted to a desired amount.

The D/A converter 28 converts the needle position information SN, which is a coded signal, into a needle position signal, which is a voltage signal.
It is converted into SNA and supplied to the needle position drive circuit 34 via the resistor 33. The needle position drive circuit 34 supplies power to the needle position actuator 14 that drives the swing mechanism so as to position the needle swing mechanism at the needle position indicated by the needle position signal SNA.
That is, the CPU 21 and the stitch data memory 26 form the information generating circuit, and the needle position drive circuit 34 and the needle position actuator 14 form the needle position drive mechanism. but,
One electrode of the amplitude adjustment socket 19 and a variable resistor 35 interlocked with the amplitude adjustment dial 12 are connected to the input terminal of the needle position drive circuit 34, and the other electrode of the socket 19 is grounded. A normally closed switch 36, which opens when it detects that the plug 16 is inserted into the socket 19, is connected between the variable resistor 35 and the ground power terminal. Therefore, the needle position signal SNA is divided into voltages adjusted by the resistor 33 and the variable resistor 35 or the potentiometer 20, and is adjusted according to the operation of the selected one of the amplitude adjustment dial 12 or the foot controller 17. The amplitude of the sewing needle 11 can be adjusted as desired. The variable resistor 35, the normally closed switch 36, and the amplitude adjustment socket 19 form the first connection circuit 37.

The start/stop push button 7 is an operating body for starting or stopping the sewing machine motor 25. One end of a switch 38 linked to the push button 7 is connected to the + power terminal, and the other end is connected to the + power terminal via a resistor 39. It is grounded and connected to the CPU 21. When the push button 7 is pressed, it supplies a signal to the CPU 21, causing it to start and stop in sequence.

The speed detector 41 detects the actual rotational speed of the sewing machine motor 25, generates speed data SP representing the rotational speed, and supplies it to the CPU 21.

A command signal generation circuit 42 is provided to adjust the rotational speed of the sewing machine motor 25 to a desired value. That is, one terminal of switches 43, 44, and 45, which are closed by pressing the low speed push button 8, medium speed push button 9, and high speed push button 10 for speed setting, is commonly connected to the + power terminal, and the other terminal is connected to the + power terminal. The terminals are respectively connected to one terminal of variable resistors 46 to 48 for adjustment. Variable resistors 46 to 48
The other terminal is commonly connected to the input terminal of the A/D converter 49, and the speed adjustment socket 1
8 and one terminal of the resistor 50. The other electrode of the socket 18 is grounded, and a normally closed switch 51, which opens when it detects that the plug 16 is inserted into the socket 18, connects the other terminal of the resistor 50 and the ground power terminal. is connected between. Therefore, one of the variable resistors 46 to 48 is selected according to the operation of any of the switches 43 to 45, and the value of the selected variable resistor is related to the presence or absence of connection to the foot controller 17. The power supply voltage is divided according to the resistor 50 and the value of one of the potentiometers 20 selected. The divided voltage is applied to the A/D as a constant speed command signal for controlling the sewing machine motor 25 at a constant speed or a variable speed command signal for controlling the sewing machine motor 25 at a variable speed.
It is supplied to converter 49. The command signal is speed command data encoded by the A/D converter 49.
It is converted into SV and supplied to the CPU 21. Here, the resistor 50, switch 51 and socket 18 form a second connection circuit 52.

Received speed data SP and speed command data SV
Based on the deviation between the actual speed of the sewing machine motor 25 represented by the speed data SP and the command speed represented by the speed command data SV, the CPU 21 fires the thyristor such that the deviation becomes zero, according to a predetermined program. Calculate the timing and apply the drive signal at the corresponding ignition timing.
SO is generated and supplied to the motor drive circuit 53.
Further, the CPU 21 supplies a braking signal SB to the motor drive circuit 53 at appropriate times in response to a stop operation by the push button 7 or generation of an abnormal signal.

The motor drive circuit 53 includes a thyristor as a power control element, fires the thyristor in response to the drive signal SO, and supplies phase-controlled power to the motor 2.
5 to drive it. Also,
When the braking signal SB is input, a thyristor provided between both terminals of the motor 25 is fired, and the motor 25 is dynamically braked. In this way, the speed detector 41, command signal generation circuit 42, CPU 21, and motor drive circuit 53 form a speed control circuit for the sewing machine motor 25.

The operation of this embodiment will be explained below.

If the plug 16 of the foot controller 17 is not inserted into the sockets 18 and 19, the rotation speed of the sewing machine motor 25 will be the same as that of the switch 4, since the switches 36 and 51 are closed.
The sewing needle 11 is controlled at a constant speed based on a three-step constant speed command signal arbitrarily selected from 3 to 45.
The amplitude amount is adjusted to an arbitrary amplitude amount set by the amplitude adjustment dial 12, and a stitch pattern is formed.
These operations must be performed manually by the worker, making it difficult to adjust them freely as the sewing progresses. Sewing work is done from beginning to end.

When the plug 16 of the foot controller 17 is inserted into the socket 18, the opposing electrodes of the plug 16 and the socket 18 are connected, and the switch 51 is opened, so that a variable speed command representing the command speed of the sewing machine motor 25 is generated. The signal is switch 4
Variable resistors 46 to 48 selected from 3 to 45
and the potentiometer 20. Therefore, when the start/stop push button 7 is operated, the amount of depression of the foot controller 17 changes to the speed selected by the switches 43 to 45 (high speed/stop button 7).
The rotation speed can be changed to any desired speed within the range (medium speed/low speed). Furthermore, since this operation is performed based on the amount of foot depression, it can be freely changed as the sewing progresses. In this case, sewing needle 11
The amplitude amount of can be made in the same way as in the previous case.

Next, when the plug 16 of the foot controller 17 is inserted into the socket 19, the plug 16
Since the opposite electrodes of the socket 19 are connected and the switch 36 is opened, the needle position signal SNA representing the amplitude of the needle is generated as a divided voltage by the resistor 33 and the potentiometer 20. That is, since the amplitude adjustment dial 12 has been replaced with the foot controller 17, the sewing needle 11 can be freely adjusted as sewing progresses by pressing the foot.
The amount of amplitude can be changed, which is particularly convenient for embroidery. In this case, the rotational speed of the sewing machine motor 25 is driven at a constant speed selected according to the operation of the switches 43 to 45, and the start and stop of the sewing machine motor 25 is operated by the push button 7.

As described above, in this embodiment, when the foot controller 17 is connected to the amplitude adjustment socket 19, the needle position signal SNA is adjusted according to the amount of depression of the foot controller 17, and the horizontal position of the needle 11 is adjusted. While the swing position in the direction is controlled, when the foot controller 17 is connected to the speed adjustment socket 18, a variable speed command signal is generated in relation to the amount of pedal operation of the foot controller 17, and the sewing machine motor 25 is controlled. The speed of the motor is controlled by variable speed. Therefore, according to the sewing machine of this embodiment, the operator inserts the plug 16 of the foot controller 17 into the socket 18 or 1 before starting work.
When connecting to the foot controller 9, it is necessary to select either the amplitude adjustment or the speed adjustment, so a special switching operation is required to switch the foot controller 17. Compared to conventional sewing machines, in which the foot controller 17 has to be checked to see which purpose it has been switched to before starting work, or if this is not checked, the seams cannot be formed accurately. The switching operation of step 17 is simplified, and sewing operations such as embroidery and sewing can be performed easily and accurately.

It should be noted that the above-mentioned embodiment is merely one embodiment of the present invention, and it goes without saying that the present invention should not be construed as being limited thereto.

For example, since the sewing machine that is the object of the present invention may be one that can rotate the sewing machine motor at a constant speed, it is not limited to the so-called built-in type of the above-mentioned embodiment. It does not matter if it is a set model or a model in which a fixed speed is automatically set when the foot controller 17 is connected.

In addition, the sewing machine motor 25 can be started and stopped using push button 7.
However, when the foot controller 17 is connected, the controller 17
It may be started and stopped depending on the amount of depression.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a sewing machine according to an embodiment of the present invention. FIG. 2 is a control circuit diagram of the embodiment of FIG. 1. 11: Sewing needle (needle), 14: Actuator for needle position (needle positioning drive circuit), 34: Drive circuit for needle position (needle positioning drive circuit), 17: Foot controller (foot operation body), 18: For speed adjustment Socket (connection terminal), 19: Socket for amplitude adjustment (connection terminal), 21: CPU, 25: Sewing machine motor, 26: Stitch data memory, 37: First connection circuit, 41: Speed detector, 42: Command signal generation circuit, 52: second connection circuit, 53: motor drive circuit, SN: needle position information.

Claims (1)

[Scope of Claims] 1. A sewing machine motor operatively connected to a needle capable of vertically reciprocating movement and horizontally swinging movement, and a sewing machine machine provided on a sewing machine frame so as to be operable to set the speed of the sewing machine motor. a manual operating body; a speed control circuit for controlling the speed of the sewing machine motor to a desired speed; and a needle position information for controlling the horizontal swing position of the needle in time with the vertical reciprocating movement. In a sewing machine equipped with an information generating circuit that generates information, and a needle positioning drive mechanism that positions the needle according to the needle position information supplied from the information generating circuit, it is possible to perform depressing operation over a predetermined range. one foot operation body; a variable speed command signal for variable speed control of the speed of the sewing machine motor in relation to the amount of operation of the foot operation body; and a variable speed command signal determined according to the operation of the manual operation body. a command signal generation circuit capable of selectively generating a constant speed command signal for controlling the speed to a constant speed; and a command signal generating circuit capable of selectively generating a constant speed command signal for controlling the speed to a constant speed; a first connection circuit for connecting the operating body to the information generating circuit so as to be able to adjust the foot operating body; a second connection circuit for connecting to the generation circuit; and the foot operating body is removably provided on the sewing machine frame, and selectively operates one of the first and second connection circuits. two connection terminals individually connected to the first and second connection circuits for the purpose of generating a constant speed command generated from the command signal generation circuit while the first connection circuit is selected. A sewing machine characterized in that the speed of a sewing machine motor is controlled according to a signal.