JPS63214278A - Battery voltage monitor apparatus for electromotive sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a battery voltage monitoring device for an electric sewing machine equipped with a battery as a power source, and particularly for monitoring the operating voltage of an electric sewing machine when the sewing machine is running and when it is stopped. The present invention relates to a battery voltage monitoring device for an electric sewing machine that makes a determination based on different voltage thresholds.

[Prior art]

Generally, the majority of electric sewing machines such as electronically controlled zigzag sewing machines are configured to be driven by a household commercial power source (100V). However, recently, devices have been known that are powered by a battery so that they can be used easily without being connected to a power source, and can also be used outdoors where no power source is available.

The battery used as the power source may be a primary battery that cannot be recharged, or a secondary battery that can be recharged from a commercial power source via an AC adapter or the like.

However, providing an electric sewing machine equipped with a battery with a special device for monitoring battery voltage has not been carried out at all and has not yet been proposed.

[Problem that the invention seeks to solve]

In an electric sewing machine equipped with a battery as a power source, even if the battery is configured with either a primary battery or a secondary battery, the amount of power that the battery can use is limited.

Therefore, if the voltage of the battery becomes lower than the voltage that can drive the sewing machine motor and other driving parts during sewing, there is a problem that the sewing speed slows down or the sewing machine motor stops without any prior notice.

Furthermore, if you replace the battery when the battery power is consumed and the voltage drops, for example, there is almost no problem when sewing a straight line, but if you replace the battery during zigzag sewing, buttonhole sewing, or one-cycle pattern sewing, etc. , the sewing machine's control device will be reset, so
Since sewing cannot be continued from the middle of the pattern and must be started from the beginning of the pattern, the continuity of the pattern is impaired and a beautiful pattern cannot be formed. In order to continue the pattern, it is necessary to disassemble the interrupted pattern, but in this case the work efficiency decreases.

[Purpose of the invention]

An object of the present invention is to determine the operable voltage of a sewing machine based on different voltage thresholds when the sewing machine is running and when it is stopped, and to issue a warning when the battery voltage drops below the voltage threshold. An object of the present invention is to provide a battery voltage monitoring device for an electric sewing machine.

[Means for solving problems]

As shown in the functional block diagram of FIG. 1, the battery voltage monitoring device for an electric sewing machine according to the present invention supplies power to a sewing machine motor that moves a sewing needle up and down, and to the sewing machine motor and other power consumption parts of the sewing machine. an electric sewing machine comprising: a detection means for detecting driving and stopping of the sewing machine motor; and a first power supply voltage value that allows the sewing machine power consumption section to operate when the sewing machine motor is stopped; It is possible to drive the sewing machine motor and is the first
setting means for setting a second power supply voltage value smaller than the power supply voltage value of , and a setting means for selecting the first power supply voltage value while the detection means detects stoppage of the sewing machine motor, and driving the sewing machine motor. and a signal generating means for generating an abnormal signal when the value of the power supply voltage of the battery falls below the selected power supply voltage value. It is something that

[Effect]

In the battery voltage monitoring device for an electric sewing machine according to the present invention, when the sewing machine motor is driving, battery power is supplied to the sewing machine motor and other sewing machine power consumption parts, and when the sewing machine motor is stopped, the battery power is supplied to the sewing machine motor and other sewing machine power consumption parts. Supplied only to other sewing machine power consumption parts.

The setting means determines a first power supply voltage value that allows the sewing machine power consumption section to operate when the sewing machine motor is stopped, and a second power supply voltage value that is smaller than the first power supply voltage value and that allows the sewing machine motor to be driven when the sewing machine motor is driven. is set, and the driving and stopping of the sewing machine motor is detected by the detection means.

Further, the selection means selects the first power supply voltage value while the detection means detects that the sewing machine motor has stopped, and selects the second power supply voltage value while the detection means detects driving of the sewing machine motor. be done.

The signal generating means generates an abnormality signal when the value of the power supply voltage of the battery becomes lower than the selected power supply voltage value.

〔Effect of the invention〕

According to the battery voltage monitoring device for an electric sewing machine according to the present invention, as explained above, when the voltage value of the battery falls below the set first power supply voltage value while the sewing machine motor is stopped, In addition, an abnormality signal is generated when the battery voltage value drops below the set second power supply voltage value while the sewing machine motor is running, so when the sewing machine has a good break, for example, a one-cycle pattern. The battery needs to be replaced or charged at the end of the sewing process, so that sewing work is not wasted, work efficiency is improved, and sewing with a beautiful finish can be achieved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an electronically controlled zigzag sewing machine to which the present invention is applied. A needle bar vertical drive device and a needle bar swing drive device are built into the arm section 2 of this sewing machine 1, and a bed section 3.
Inside, a vertical feed drive device for vertically moving the feed dog for cloth feeding and a back-and-forth feed drive device for moving the feed dog back and forth are built in. The devices are driven by pulse motors 4 and 5 (see Fig. 3) which are controlled by a control device, and the needle bar vertical drive device and the vertical feed drive device are driven by a sewing machine motor (DC motor) 6 (see Fig. 3). is driven by.

The machine frame of the sewing machine 1 includes a start/stop switch 7 for starting and stopping the sewing operation, a speed volume 8 for changing the sewing speed from low to high, and a numeric keypad for selecting the desired pattern. Pattern selection switch 9, display 10 for displaying the selected pattern number
, a power switch 11 (see FIG. 3), etc. are provided.

Next, the overall configuration of the control system of the sewing machine 1 will be explained based on the block diagram of FIG. 3.

The needle bar swinging pulse motor 4 serves as the needle bar swinging drive device.
and a pulse motor driver 12 are provided, and a pulse motor 5 for longitudinal feeding and a pulse motor driver 12 are provided as a longitudinal feeding drive device for the feeding dog.

A sewing machine motor driver 13 is connected to the sewing machine motor 6 that drives the needle bar up and down and drives the needle bar up and down.

A tacho generator 14 is connected to the sewing machine motor 6, detects the rotational speed of the sewing machine motor 6, and feeds back a rotational speed signal to a CPU (central processing unit) 19.

The display device is provided with a display 10 and a display driver 15 for displaying pattern selection numbers in seven segments.

The alarm device AL is provided with a buzzer 16 built into the sewing machine body and a buzzer driver 17 that drives the buzzer 16.

The set speed signal set by the speed volume 8 is output to the CPU 9 via the A/D converter 18.

The pattern selection switch 9, pulse motor driver 12, sewing machine motor driver 13, display driver 15, and buzzer driver 17 are each connected to the CPU 19.

The control device C includes a CPU (central processing unit) 19 and its C
ROM (
read-only memory) 20 and RAM (random
access memory) 21.

The ROM 20 includes a pattern data memory in which data regarding the swing position of the needle bar, feed amount and feed direction of the feed dog for each sewing operation for each stitch pattern is stored in advance in association with the pattern number, and a pattern data memory for selecting the stitch pattern. A control program is used to control the pulse motor 4 for swinging the needle bar and the pulse motor 5 for forward/backward feeding based on the selected pattern data, and a display driver 1 is used to display the selected pattern number on the display 10.
5, a control program that controls the buzzer driver 17 to sound the buzzer 16, and a control program that controls the buzzer driver 17 to sound the buzzer 16; and when the sewing machine motor 6 is stopped (when the discharge current of the battery 22 is low), power consuming devices other than the sewing machine motor 6 operate. Possible threshold voltage value ■9 and a threshold value that is smaller than voltage value ■A and at which the sewing machine motor 6 can be driven to rotate when the sewing machine motor 6 is being driven (when the discharge current of the battery 22 is large) and the load is light. A hold voltage value V51, a threshold voltage value VS2 when the load is heavy, and a threshold voltage value (■) at which the sewing machine motor 6 can rotate immediately after the power switch 11 is turned on. A control program for voltage drop determination control, which will be described later, including the following is stored.

The RAM 21 is provided with various types of memories that temporarily store the results of calculations performed by the CPU 19.

The power from battery 22 as a power source of approximately 18V is
Power is supplied to a sewing machine motor driver 13 and a pulse motor driver 12 via a power switch 11.

Furthermore, the power supply voltage of the battery 22 is controlled by the voltage regulator 2.
3 to 5■, the pattern selection switch 9;
Speed volume 8, CPU19, ROM20, RA
M21. It is supplied to the buzzer driver 17 and display driver 15.

A voltage detection circuit 24 composed of an A/D converter and the like is connected in parallel with the battery 22 and outputs a voltage signal corresponding to the voltage of the battery 22 to the CPU 19.

Next, a routine for voltage drop determination control performed by control device C of sewing machine 1 will be described with reference to the flowchart of FIG.

When the power switch 11 is turned on, this control is started, and the process moves to step St (hereinafter simply referred to as Sl, and the other steps are handled in the same way), initial settings are executed, and the process moves to S2.

In S2, the CPU 19 reads the voltage signal from the voltage detection circuit 24 in order to know the power supply voltage value (6) of the battery 22 immediately after the power is turned on, and proceeds to S3 to determine the threshold voltage value V of the ROM 20 immediately after the power is turned on. compared to
The voltage value ■1 is the threshold voltage value ■. It is determined whether or not the voltage value 5 is the voltage value V. If it is smaller, the process moves to S4. At S4, the buzzer 16 is sounded to alert the operator, and at the next step 35, the character "L'" (meaning voltage drop) is displayed blinking on the display 10 instead of the pattern selection number, and the process moves to 86. do. When the determination is Yes in S3, that is, the battery 22
When the voltage value (1) is sufficient to drive the sewing machine motor 6, the process moves to S6.

In S6, the voltage value ■1 of the battery 22 is read. In the next step 87, it is determined whether or not the sewing machine motor 6 is being driven based on the rotational speed signal from the tachogenerator 14 or the drive signal to the sewing machine motor driver 13, and if it is not being driven, the process moves to S8. In S8, the battery voltage value ■6 is based on the threshold voltage value ■8.
It is determined whether or not the voltage value ■9 is greater than or equal to the voltage value ■9, and when the voltage value ■6 is greater than or equal to the voltage value 7M, steps 86 to S8 are repeated and the voltage value ■
, is smaller than the voltage value ■9, the process moves to S9.

In S9, it is determined whether or not a predetermined time has elapsed since the sewing machine motor 6 stopped, based on the data of the soft timer that counts the clock signal of the CPU 19. If the predetermined time has not elapsed, that is, immediately after the sewing machine motor 6 stops In this case, the buzzer 16 is sounded in S4, and the characters II L I+ are displayed blinking in the next step 85, and then the process returns to S6.

However, if it is determined Yes in S9, S5
After flashing the letter "L"', the process returns to S6. In other words,
In this case, the power of the battery 22 consumed to make the buzzer 16 sound is saved.

Then, the start/stop switch 7 is operated and the C
When the PU 19 outputs a drive signal to the sewing machine motor driver 13, the sewing machine motor 6 is rotationally driven.
If it is determined that this is the case, the process moves to SIO.

In S10, A/
Based on the set speed signal output to the CPU 19 via the D converter 18 and the rotation speed signal from the tacho generator router 14, it is determined whether the load is large or not, that is, the set speed and the actual rotation speed of the sewing machine motor 6. It is determined whether or not the difference is large, and if the load is large, the process moves to Sll.

In Sll, based on the threshold voltage value VSZ of the ROM 20, it is determined whether the battery voltage value ■E is greater than or equal to the threshold voltage value ■s2 when the load is heavy, and the voltage value ■E is determined. is the voltage value ■, S6 when it is 2 or more
The process moves to S6 and subsequent steps are repeated, and when the voltage value VS2 is smaller than the voltage value VS2, the process moves to S12.

In S12, it is determined whether or not the pattern currently being sewn is a one-cycle pattern based on the selection number data from the pattern selection switch 9. If it is not a one-cycle pattern such as straight stitching, for example, S5 and subsequent steps are executed. A warning will be displayed to the operator, and if the pattern is one cycle, S13 will be displayed.
Move to.

In S13, it is determined whether or not the pattern data read based on the pattern data in the ROM 20 is the end code stored at the end of the pattern, that is, whether it is at the pattern break position.If it is not at the break position, S5 and subsequent steps are executed. is displayed and a warning is displayed to the operator, and when it is at the break position, the process moves to S14.
The output of the drive signal to the sewing machine motor driver 13 is stopped, the sewing machine motor 6 is stopped, and S5 and subsequent steps are executed to display a warning to the operator.

On the other hand, when there is almost no difference between the set speed dust and the rotational speed of the sewing machine motor 6, the load is small, so the No.
It is determined that the process moves to S15.

In step 315, it is determined whether the battery voltage value ■6 is equal to or higher than the threshold voltage value V31 when the load is small based on the threshold voltage value ■s1, and when the voltage value ■1 is equal to or higher than the voltage value ■s1, the voltage value ■6 is determined. and move to S
6 and subsequent steps are repeated, and when the voltage value ■1 is smaller than the voltage value ■, I, steps S12 and subsequent steps are executed and a warning is displayed to the operator.

As explained above, the power supply voltage of the battery 22 decreases based on the respective threshold voltage values immediately after the power is turned on, when the sewing machine motor 6 is stopped, when the load is large and when the load is small while the sewing machine motor is driving. Since the sewing machine motor 6 does not stop during sewing, the battery 22 can be replaced or charged at a convenient time during sewing work, and work efficiency is improved. Moreover, it is possible to sew with a beautiful finish.

In the above embodiment, the voltage of the battery 22 is detected by the voltage detection circuit 24, but the voltage detection circuit 24 detects the voltage of the battery 22 based on the number of stitches, the driving time of the sewing machine motor 6, and the cumulative value of the current supplied to the sewing machine motor 6. You may also do so.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram showing the configuration of the present invention, Fig. 2 is a perspective view of an electronically controlled zigzag sewing machine, Fig. 3 is a block diagram of the control system of the sewing machine, and Fig. 4 is a routine for voltage drop discrimination control. It is a flowchart. 1. Electronically controlled zigzag sewing machine, 4. Pulse motor for swinging the needle bar, 5. Pulse motor for forward and backward feeding,
6. Sewing machine motor, 10. Display, 1
2...Pulse motor driver, 13...Sewing machine motor driver, 14...Tacho generator, 16...Buzzer, 19...CPU. 20...ROM, 21...RAM, 22...
・Battery, 24...Voltage detection circuit. Patent applicant: Brother Industries, Ltd.

Claims (1)

[Claims] (1) In an electric sewing machine equipped with a sewing machine motor that moves a sewing needle up and down, and a battery that supplies power to the sewing machine motor and other power consuming parts of the sewing machine, a detection means that detects driving and stopping of the sewing machine motor. and a first power supply voltage value that allows the sewing machine power consumption section to operate when the sewing machine motor is stopped, and a second power supply voltage value that allows the sewing machine motor to be driven and is smaller than the first power supply voltage value, respectively. setting means for setting, and selecting the first power supply voltage value while the detection means detects stoppage of the sewing machine motor, and selecting the second power supply voltage value while the detection means detects driving of the sewing machine motor. 1. A battery voltage monitoring device for an electric sewing machine, comprising: a selection means for selecting the power supply voltage of the battery; and a signal generation means for generating an abnormal signal when the value of the power supply voltage of the battery falls below the selected power supply voltage value.