JPS63214280A - 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, and in particular, a device that counts the number of times the battery voltage drops below a predetermined voltage and reaches a predetermined number of times. The present invention relates to a battery voltage monitoring device for an electric sewing machine that reliably notifies a battery voltage drop.

[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, whether the battery is a primary battery or a secondary battery, there is a limit to the amount of power that the battery can use.

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.

Further, when the battery voltage is detected and an alarm or the like is issued based on the detected voltage value, it is difficult to accurately detect the battery voltage due to the influence of noise.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a battery voltage monitoring device for an electric sewing machine that can reliably notify a battery voltage drop when the number of times the battery voltage has dropped below a predetermined voltage reaches a predetermined number of times. It is.

[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 is a sewing machine equipped with a battery that supplies power to a sewing machine motor that moves a sewing needle up and down. A detecting means for generating a voltage drop signal when the voltage drops below a predetermined voltage, and a signal generating means for counting the number of occurrences of the voltage drop signal and generating an abnormal signal when the number of times reaches a predetermined number are provided. It is something that

Note that, if necessary, it may include optical abnormality warning means that responds to an abnormality signal from the signal generation means.

[Effect]

In the battery voltage monitoring device for an electric sewing machine according to the present invention, the battery supplies power to drive the sewing machine motor, so that its power supply voltage gradually decreases, and the battery power supply voltage reaches a predetermined level. When the voltage drops below the voltage, the detection means generates a voltage drop signal.

The signal generating means counts the number of times the voltage drop signal is generated, and generates an abnormal signal when the number of times reaches a predetermined number.

〔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 drop signal generated when the battery power supply voltage drops below a predetermined voltage reaches a predetermined number, an abnormal signal is generated. Since it is possible to reliably detect battery voltage drops, it is possible to sew at a good point in the sewing work, such as the end position of a one-cycle pattern, and then replace and charge the battery, making the sewing work smoother. can be done,
It is possible to improve work efficiency and perform beautiful sewing without wasting sewing work.

Furthermore, since voltage drop signals are counted a predetermined number, temporary drops in battery voltage due to noise, etc. can be eliminated, and the predetermined voltage can be set to a low value with no margin, so the battery can be used without wasting it.

〔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, in which 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 pet 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 each driven by a pulse motor or the like 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) 4.

The machine frame of the sewing machine 1 includes a start/stop switch 5 for starting and stopping the sewing operation, a speed volume 6 for changing the sewing speed from low to high, and a numeric keypad for selecting a desired pattern. a pattern selection switch 7; a display 8 for displaying the selected pattern number;
An alarm lamp 10 and a power switch 11 (see Fig. 3), etc., are installed to notify a voltage drop when the number of times the power supply voltage of the battery 9 drops below a set voltage reaches 100 consecutive times (approximately 10 seconds) or more. It is 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.

A sewing machine motor driver 12 is connected to a sewing machine motor 4 that drives the needle bar up and down and drives the needle bar up and down, and the sewing machine motor driver 12 is connected to a battery 9.

Although not shown in FIG. 3, the pulse motor for swinging the needle bar and the pulse motor for forward and backward feeding are connected to a pulse motor driver, and the pulse motor driver is connected to the battery 9.

Timing sensor 1 composed of photo ink ladle etc.
3 outputs a sensor signal (pulse signal) to the CPU (Central Processing Unit) 15 of the control device C for each highest position of the needle bar in conjunction with the rotation of the main shaft of the sewing machine.

The start/stop switch 5 is turned on and off each time it is operated, and outputs the switch signal to the CPU 15.

The alarm device AL includes an alarm lamp 10 made of a light emitting diode or the like, and a lamp driver 14 that turns on the alarm lamp 10.

The A/D converter 18 converts the voltage applied to the voltage dividing point of the resistor R1 and the resistor R2, which are voltage dividing resistors connected in parallel with the battery 9, into voltage data corresponding to the voltage, and converts the voltage into voltage data corresponding to the voltage.
This is output to U15. Therefore, the above voltage data corresponds to the voltage value of the battery 9.

Timing sensor 13, start/stop switch 5
, sewing machine motor driver 12, lamp driver 14, A
/D converter 18 and pulse motor driver are each CPU
15.

The control device C includes a CPU (central processing unit) 15 and its C
ROM (
It consists of a read-only memory (IJ) 16 and a RAM (random access memory) 17.

The ROM 16 includes a program for outputting a control signal to the sewing machine motor driver 12 in response to a switch signal from the start/stop switch 5, and a program for controlling the alarm device AL when a voltage drop in the battery 9 is detected. The ff1l program, a control program for calculating the voltage value of the battery 9 from voltage data of the A/D converter 18, and a program for controlling voltage drop of the battery 9, which will be described later, are stored. The set voltage value V, which is the power supply voltage value at which the sewing machine motor 4 and other drive units can operate, is included in the voltage drop determination control program.

The RAM 17 includes various memories that temporarily store the results of calculations performed by the CPtJ 15, as well as a voltage drop counter that counts the number of times the voltage value of the battery 9 is determined to be smaller than the set voltage value V. It is provided.

The power from the battery 9 as a power supply of about 18V is supplied to the sewing machine motor driver 12 and the pulse motor driver via the power switch 11, and is further stepped down to 5V via the voltage regulator 19, and the power is supplied to the timing sensor 13 and the start. /stop switch 5, lamp driver 14, A/D converter 8, CPU 15, ROM 16 and RAM 17.

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 31 (hereinafter simply referred to as 81, and the same applies to other steps), where initial settings such as extinguishing the alarm lamp 10 are executed. Move to S2.

In S2, it is determined whether or not the start/stop switch 5 is on based on the switch signal of the start/stop switch 5. If it is on, the process moves to S3, the sewing machine motor 4 is driven, and the process moves to S5, and then it is turned off. Sometimes S
4, the sewing machine motor 4 is stopped, and the process moves to S5. At this time, the CPU 15 outputs a control signal to the sewing machine motor driver 12.

In S5, voltage data output from the A/D converter 18 is read. In the next step 86, the battery voltage value V is set to the set voltage value based on the power supply voltage value of the battery 9, which is obtained by calculating the read voltage data using the control program, and the set voltage value V of the ROM 16. It is determined whether the battery voltage value vE is equal to or greater than 73, and when the battery voltage value vE is equal to or greater than the set voltage value 75, the battery voltage value vE is within the usable range, and the process proceeds to S7, where the voltage drop counter in the RAM 17 is reset.

In the next step 88, S8 is repeated until 0.1 second has elapsed based on the data of the soft timer that counts the clock signal of the CPU 5, and when 0.1 second has elapsed, it is determined Yes and the process returns to S2.

Then, when the battery voltage value VE becomes smaller than the set voltage value V, a negative determination is made in S6, and the process moves to S9.

In S9, 1 is added to the voltage drop counter, and in S10, it is determined whether the count value is 100 or more based on the data of the voltage drop counter. If the count value is less than 100, the process moves to S8, and S8.82 to SIO is repeated.

When the count value of the voltage drop counter reaches 100 or more, that is, the battery voltage value ■, the set voltage value ■.

If about 10 seconds or more have passed continuously since the following
Move to l.

At Sll, the alarm lamp 10 is turned on and at S8
Move to.

When the alarm lamp 10 turns on, the operator replaces or charges the battery 9 after sewing up to a good separation.

As explained above, immediately after driving the sewing machine motor 4, or when the voltage value of the battery 9 temporarily drops below the set voltage value due to noise, etc., an alarm is not generated.
An alarm will be issued when the voltage drops below the set voltage value for approximately 10 seconds or more, so this is a good way to break up sewing work.
For example, it is possible to sew up to the end position of a one-cycle pattern, and then the battery must be replaced and charged, so that the sewing work can be carried out smoothly, work efficiency is improved, and sewing with a beautiful finish can be achieved.

Furthermore, since an alarm is generated when the number of voltage drops is counted 100 times in a row, temporary drops in the battery voltage value due to noise etc. can be eliminated, and the set voltage value can be set to a low value that does not allow for margin. can be used without waste.

In the above embodiment, the predetermined number of times is 100 times, but it is of course possible to change the predetermined number of times depending on the capacity and number of batteries 9 used, and the set voltage value can be changed depending on various conditions such as the capacity of the battery 9. Of course, it is also possible to take this into account and change it.

[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 diagram for voltage drop determination control. It is a flowchart. 1.Electronically controlled zigzag sewing machine, 4.Sewing machine motor, 9.Battery, 10.Alarm lamp, 15.CPU, 16.ROM117.
-RAM, 18...A/D converter, AL...alarm device, C...control device.

Claims (2)

[Claims] (1) In a sewing machine equipped with a battery that supplies power to a sewing machine motor that moves a sewing needle up and down, a detection means that generates a voltage drop signal when the power supply voltage of the battery drops below a predetermined voltage; 1. A battery voltage monitoring device for an electric sewing machine, comprising signal generating means for counting the number of occurrences and generating an abnormal signal when the number of occurrences reaches a predetermined number. (2) The battery voltage monitoring device for an electric sewing machine according to claim 1, further comprising optical abnormality warning means that responds to an abnormality signal from the signal generation means.