JPH11104030A - Discharge device for liquid detergent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately indicate the remaining capacity of a battery by means of a low-battery detecting circuit with a simple circuit, even if the starting current of the motor for driving pump becomes instantaneously a large current. SOLUTION: A discharge device for a liquid detergent is provided with a motor 1 for driving a pump that discharges the liquid detergent in a detergent vessel through a nozzle, a battery 6 for driving the motor 1, and a control circuit which rotates the motor 1 by detecting the hands reached out and which drives the pump for discharging the liquid detergent. The control circuit is provided with a low-battery circuit 20 which detects and indicates the reduction in the voltage of a battery. The low-battery detecting circuit 20 is connected to a voltage reduction compensating circuit 24 such as a compensating condenser in a battery voltage detecting part. The voltage reduction compensating circuit 24 compensates the instantaneous voltage reduction of the battery voltage, and eliminates the malfunction of the low-battery detecting circuit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid detergent dispensing apparatus which is mainly installed in a washroom and is used for supplying a liquid detergent to hands.

[0002]

2. Description of the Related Art There has been developed an apparatus which detects the presence of a hand by an optical sensor to drive a pump, and the pump discharges a liquid detergent from a nozzle toward a hand. This device includes a circuit for detecting that the hand has been extended and rotating the motor. When the hand is put out, the motor is rotated, and the rotating motor drives the pump. The pump sucks the liquid detergent stored in the detergent container and ejects it from the nozzle toward the hand. Since this device automatically discharges the liquid detergent when the hand is put out, it can be conveniently installed in a washroom or the like.

[0003] The liquid detergent discharging device can be easily installed as a structure in which a motor is rotated by a battery and a pump is driven by the motor. This is because it can be installed without electric wiring. In a discharge device using a battery as a power supply, the pump does not operate when the battery is discharged. Therefore, the battery needs to be replaced before it is completely discharged. A low battery detection circuit is provided to indicate the battery discharge time. This circuit detects the voltage of the battery and indicates the remaining capacity. Since the voltage of the battery decreases as the battery is discharged, the remaining capacity can be detected by the voltage. When the remaining capacity is low, for example, the LED is blinked to indicate that it is time to replace the battery.

[0004]

A liquid detergent discharging device which detects the voltage of a battery and indicates the remaining capacity can be conveniently used as long as the low battery detection circuit operates normally. This is because the display of the low battery detection circuit indicates the time for replacing the battery. However, in a discharge device that drives a pump that discharges a liquid detergent by a motor, a battery voltage fluctuates depending on a load of the pump, which has a problem that a display of a low battery detection circuit is disturbed. The load of the pump fluctuates in the state of the liquid detergent, and the fluctuation of the load of the pump changes the voltage of the battery. In particular, the state of the liquid detergent remaining in the pump greatly changes the load on the pump. For example, if the pump is idle for a long time while the liquid detergent remains in the pump, the liquid detergent in the pump adheres to the sliding parts of the pump, increasing the frictional resistance of the pump, or partially Liquid detergent that is hardened
Make the pump hard to move. In this state, in particular, the maximum static friction resistance when starting the pump is increased, and the starting of the pump, in other words, the starting torque of the motor is increased. To further complicate matters, the motor has a characteristic that a large current flows at the moment of starting. Therefore, when the load at the time of starting increases, an extremely large starting current flows momentarily. The large instantaneous starting current significantly lowers the output voltage due to the internal resistance of the battery, causing a detection error in the low battery detection circuit. Therefore, when the load on the pump increases and the instantaneous starting current increases, the low battery detection circuit erroneously indicates that the remaining capacity is low even though the remaining capacity of the battery is considerable. .

The present invention has been developed with the object of overcoming such disadvantages. The present invention uses an extremely simple circuit, and can be used even when the starting current of a motor for driving a pump becomes large instantaneously. It is another object of the present invention to provide a liquid detergent discharging device in which a low battery detection circuit can accurately display the remaining capacity of a battery.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a liquid detergent dispensing apparatus comprising a detergent container 3 filled with a predetermined amount of liquid detergent.
And a pump 5 for sucking the liquid detergent stored in the detergent container 3 and discharging it from the nozzle 4, a motor 1 for driving the pump 5, a battery 6 for driving the motor 1, and detecting that the user has put his hand out. And a control circuit configured to rotate the motor 1 to drive the pump 5 to discharge the liquid detergent.

The control circuit includes a low battery detection circuit 20 for detecting and displaying that the voltage of the battery 6 has dropped. In the low battery detection circuit 20, a voltage drop compensation circuit 24 such as a compensation capacitor is connected to the battery voltage detection unit. The voltage drop compensating circuit 24 outputs the voltage compensated for the instantaneous voltage drop of the battery voltage to the low battery detecting circuit 2.
Enter 0.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a control circuit of a liquid detergent discharging device for embodying the technical idea of the present invention, and the present invention does not specify the control circuit as follows.

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims" and "claims". In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.

The discharge device for liquid detergent shown in the sectional view of FIG. 1 is a retrofit type discharge device which is not built in a wash basin or the like, and has a detergent container 3 in a plastic case 2 and a liquid stored in the detergent container 3. A pump 5 for sucking the detergent and discharging it from the nozzle 4, a motor 1 for driving the pump 5, a battery 6 for rotating the motor 1, and a motor 1
And a control circuit for controlling the rotation of the motor.

The case 2 is made of plastic and has a detergent container 3.
And a stand case 2A fixed to a wash basin or a wall of a building so that the detergent container 3 can be replaced with a new one, and a detachable detachably attached to the stand case 2A. And a case 2B. The attachment / detachment case 2 </ b> B houses equipment including the battery 6, the motor 1, the pump 5, and the detergent container 3. The battery 6 is mounted so that it can be replaced with a removable case 2B. Battery 6
When replacing the case, the detachable case 2B becomes the stand case 2A
Removed from The detachable case 2B detached from the stand case 2A has an open back surface, and the battery 6 is replaced through this opening.

The control circuit forcibly rotates the motor 1 when a hand is inserted below the nozzle 4 and when a manual switch is operated. The motor 1 drives the pump 5 to suck the liquid detergent in the detergent container 3 and discharge it from the nozzle 4. The pump 5 shown in the drawing reciprocates the bellows-like container 7, and the rotating motor 1 reciprocates the lower end of the bellows-like container 7 to discharge the liquid detergent from the nozzle 4. The device of the present invention does not specify a pump of the type described above. As the pump, all types in which the motor can be rotated to transfer the liquid detergent, for example, a piston pump that reciprocates a piston in a cylinder or a constant flow pump such as a gear pump can be used instead of a bellows-like container.

FIG. 2 is a block diagram of a control circuit for controlling the rotation of the motor 1, and FIG. 3 is a circuit diagram thereof. The control circuits shown in these figures are stopped after rotating the motor 1 for a certain time to discharge a fixed amount of liquid detergent when the hand is outstretched. Further, the control circuits shown in these figures have a built-in forced off timer circuit 15 for forcibly stopping the discharge of the liquid detergent for a certain period of time after discharging the liquid detergent. This is to prevent the liquid detergent from being discharged many times continuously due to mischief or the like. Further, the control circuit shown in FIG. 3 includes a manual switch 18 for forcibly rotating the motor 1 when the detergent container is replaced or the detergent container is refilled with the liquid detergent. When the manual switch 18 is operated, the operation of the forced off timer circuit 15 is canceled, and the motor 1 is forcibly rotated. When the liquid detergent runs out, the manual switch 18 is operated to discharge the air sucked into the transfer path of the liquid detergent.

The control circuit shown in FIGS. 2 and 3 comprises a light emitting element 10 for irradiating light toward a hand for injecting a liquid detergent, and a light receiving element for receiving light reflected by the light of the light emitting element 10 by hand. A light receiving circuit 12 including an element 11; a storage circuit 13 that outputs a liquid detergent discharge signal when an output of the light receiving circuit 12 is input and reflected light is input for a predetermined time; And a switching circuit 14 that rotates the motor 1 that drives the pump 5 when a discharge signal is output. After the switching circuit 14 rotates and stops the motor 1, the motor 1 rotates for a certain period of time. , An oscillating circuit 16 for intermittently operating the light-emitting element 10 and the light-receiving circuit 12, and a flashing lamp to notify that the battery voltage has dropped. And a battery flashing light source 21.

As shown in the bottom view of FIG. 4, the light emitting element 10 and the light receiving element 11 are disposed on both sides of the nozzle 4 and face downward. In the control circuit shown in the figure, the light emitting element 10 is an LED, and the light receiving element 11 is a photodiode. Light-emitting elements are all elements that emit electricity instead of LEDs,
For example, a light bulb or the like can be used. An LED is a light-emitting element that is suitable for blinking at a constant cycle because of a short response time and a long life. As the light receiving element, a phototransistor can be used instead of the photodiode.

The light emitting element 10 and the light receiving element 11 form a pair, and are arranged at a position where the light beam emitted from the light emitting element 10 is reflected by the hand and received by the light receiving element 11.

Further, the control circuit shown in FIG.
Do not turn on 0 continuously. The light emitting element 10 is turned on and off. The control circuit includes an oscillating circuit 16 and a power supply switch circuit 17 that is switched by the output of the oscillating circuit 16 to make the light emitting element 10 blink. The oscillation circuit 16 oscillates a rectangular wave having a constant period. Oscillation circuit 16
Are supplied to the power supply switch circuit 17.
The power supply switch circuit 17 is turned on and off by the rectangular wave input from the oscillation circuit 16 and
0 lights up intermittently.

The power supply switch circuit 17 includes the light emitting element 1
In addition to 0, the power supplied to the light receiving circuit 12 is interrupted.
The light receiving circuit 12 to which power is supplied from the power supply switch circuit 17 does not continuously consume power, but is supplied with power intermittently. Thus, the control circuit that supplies power to the light emitting element 10 and the light receiving circuit 12 via the power supply switch circuit 17 can reduce the average power consumption. Therefore, the consumption time of the battery 6 can be reduced, and the replacement time of the battery 6 can be extended. The light emitting element 10 and the light receiving circuit 12 are operated together in synchronization with each other to amplify and process the output of the light receiving element 11.

The power supply switch circuit 17 includes the light receiving circuit 1
2 includes a power transistor Q5 which is a power switching element for supplying power to the light emitting element 2 and a light emitting transistor Q6 which is a light emitting switching element for blinking the light emitting element 10. The power transistor Q5 is supplied from the oscillation circuit 16
Turns on when the L "signal is input to the base and supplies power from the collector. Power transistor Q5
Is connected to the power supply circuit of the light receiving circuit 12 and supplies power to the light receiving circuit 12. The light-emitting transistor Q6 has an LED that is the light-emitting element 10 connected to the collector. Further, the base is connected to the driver transistor Q7 through a buffer 23 for inverting the phase.
It is connected to the output side of the oscillation circuit 16. The “L” signal output from the oscillation circuit 16 is inverted in phase by the buffer 23 to become an “H” signal, and the “H” signal is transmitted to the light emitting transistor Q via the driver transistor Q7.
6 to turn on the light emitting transistor Q6. The light emitting transistor Q6 is turned on when the output of the oscillation circuit 16 is an “L” signal, and turns on the LED that is the light emitting element 10.

Further, the output of the oscillation circuit 16 is also input to the low battery detection circuit 20. The low battery detection circuit 20 compares the voltage of the battery 6 with the set voltage, and when the battery voltage becomes lower than the set voltage, indicates that the remaining capacity is low. The low battery detection circuit 20 shown in the figure blinks the low battery blinking light source 21 which is an LED, to indicate that the remaining capacity is low. The low-battery detection circuit 20 can also display that the remaining capacity has decreased by, for example, turning on an LED of a specific emission color without blinking a light source such as an LED. The low-battery detection circuit that lights the LED of a specific emission color to display the remaining capacity does not require a switching element for blinking the LED.

The low battery detection circuit 20 shown in FIG.
When the remaining capacity becomes low, the low battery blinking light source 21 which is an LED blinks. Therefore, this circuit includes a blinking transistor Q8 which is a blinking switching element for blinking the LED of the low battery blinking light source 21.
And a voltage detection circuit 22.

The voltage detection circuit 22 of the low battery detection circuit 20 compares the battery voltage with the set voltage, and connects one end of the low battery blinking light source 21 to the ground when the input battery voltage becomes lower than the set voltage. Make this blink. The voltage detection circuit may include a latching circuit. The voltage detection circuit with a built-in latching circuit
When the battery voltage becomes lower than the set voltage and the low battery flashing light source starts to flash, then even if the battery voltage becomes higher than the set voltage, the low battery flashing light source flashes and the remaining capacity decreases. Display the status
When the battery is replaced, the latching circuit detects that the battery voltage has dropped to 0 V and is reset.

However, the low battery detection circuit 20 does not necessarily need to incorporate a latching circuit. The low battery detection circuit 20 without a built-in latching circuit
When the battery voltage falls below the set voltage, the low battery blinking light source 21 blinks, but when the battery voltage rises above the set voltage, the low battery blinking light source 21 stops blinking.

The voltage detecting circuit 22 has a voltage drop compensating circuit 24 connected to the input side which is a battery voltage detecting section. The voltage drop compensation circuit 24 shown in the figure is a capacitance compensation capacitor for compensating for an instantaneous drop in battery voltage. The compensation capacitor, which is the voltage drop compensation circuit 24, discharges the charged charge when the battery voltage drops instantaneously, and prevents the voltage at the input terminal of the voltage detection circuit 22 from decreasing. Although not shown, the voltage drop compensating circuit 24 may use a small-capacity battery as a compensating battery instead of the compensating capacitor. The compensation battery used for the voltage drop compensation circuit 24 is a secondary battery,
Use an output voltage that is almost the same as. The compensating battery is of a small capacity that is discharged by the current flowing to the input side of the voltage detecting circuit 22 and has substantially the same voltage as the battery 6.
If the capacity of the compensating battery is too large, the voltage does not decrease even if the voltage is discharged on the input side of the voltage detection circuit, and the voltage detection circuit
Cannot be detected accurately. However, the compensation battery is
Even if the voltage of the battery 6 drops temporarily, the voltage detection circuit 22
Do not lower the voltage input to Therefore, the compensation battery compensates for a temporary voltage drop of the battery voltage. The voltage drop compensating circuit 24 such as a compensating capacitor and a compensating battery compensates for a temporary drop in battery voltage, but does not compensate for a state in which the battery is discharged and the voltage drops slowly. Therefore, it is not compensated that the battery is discharged and the voltage drops on average.

The base of the blinking transistor Q 8 is connected to the output side of the oscillation circuit 16. The blinking transistor Q8 is turned on when an “L” signal is input to the base, and connects one end of the low battery blinking light source 21 to the + side of the battery 6. This low battery detection circuit 20
Only when the battery voltage becomes lower than the set voltage and the "L" signal is input from the oscillation circuit 16 to the blinking transistor Q8, the low battery blinking light source 21 is turned on.
When the battery voltage becomes lower than the set voltage, one end of the low battery blinking light source 21 is connected to the ground. Therefore, in this state, the low battery blinking light source 21 is turned on when the rectangular wave output from the oscillation circuit 16 is an “L” signal, is turned off when the rectangular wave is an “H” signal, and is synchronized with the rectangular wave. Flashes.

The light receiving circuit 12 which operates intermittently with the output of the oscillation circuit 16 amplifies the output of the light receiving element 11 and inputs the amplified output to the storage circuit 13. The accumulation circuit 13 accumulates the “H” signal input from the light receiving circuit 12 when the hand is put out, and outputs a discharge signal. The storage circuit 13 shown in the figure includes a first storage circuit 13A and a second storage circuit 13B in order to more accurately detect that a hand is out. The output of the first storage circuit 13A is delayed through the delay circuit 13C to the second storage circuit 13A.
The signal is input to the storage circuit 13B. This storage circuit 13 can prevent malfunction due to external noise or external light. This is because when both the first storage circuit 13A and the second storage circuit 13B output the ejection signal, the switching circuit 14 is turned on to rotate the motor 1.

The "H" signal from the light receiving circuit 12 is first input to the first storage circuit 13A. Therefore, the first storage circuit 13A first outputs the ejection signal. The ejection signal of the first storage circuit 13A is input to the second storage circuit 13B with a delay. Therefore, the second storage circuit 13B outputs the ejection signal later than the first storage circuit 13A. When the hand is continuously extended, the first storage circuit 13
A continuously outputs the ejection signal. Therefore, the ejection signal is output from both the first storage circuit 13A and the second storage circuit 13B. However, when a temporary pulse-like "H" signal is input to the storage circuit 13 due to noise or external light, the first storage circuit 13A first outputs a discharge signal, and this output is used to output the second storage circuit 13B. Also outputs the ejection signal, but when the second accumulation circuit 13B outputs the ejection signal, the first accumulation circuit 1
3A does not output the ejection signal. Therefore, even if the “H” signal is momentarily input from the light receiving circuit 12, both the first accumulation circuit 13A and the second accumulation circuit 13B do not output the ejection signal together. In a state where the reflected light of the hand is input to the light receiving element 11, the light receiving circuit 12 inputs the "H" signal to the storage circuit 13 for a certain period of time, so that the storage circuit 13 includes the first storage circuit 13A and the second storage circuit. 13B output ejection signals. Therefore, the storage circuit 13 accurately detects that the hand has been extended, and the storage circuit 13 outputs the ejection signal to the switching circuit 1.
4 is output.

The switching circuit 14 includes a switching element Q1 connected in series to the motor 1, and a driver connected to the input side of the switching element Q1 to switch the switching element Q1 on and off by a discharge signal. The driver includes an input transistor Q2 to which the ejection signal is input, and a buffer transistor Q3 which is turned on / off by the input transistor Q2.

The input transistor Q2 has its input side base connected to the output side of the first storage circuit 13A and the output side of the second storage circuit 13B via diodes D1 and D2.
The buffer transistor Q3 has its input side base connected to the output side emitter of the input transistor Q2. Furthermore, the buffer transistor Q3
Connects the collector on the output side to the base on the input side of the switching element Q1.

The manual switch 18 connected in parallel with the switching element Q1 is turned on by performing an operation such as pushing or turning the switch. Manual switch 18
Is turned on, the motor 1 is forcibly rotated. The manual switch 18 is operated when the detergent container is replaced or when the detergent container is refilled with the liquid detergent, and the motor 1 is forcibly rotated. This is because, when the detergent container is replaced or the liquid detergent is refilled, the air entering the liquid detergent transfer path is discharged. Manual switch 18
Rotates the motor 1 until the air entering the liquid detergent transfer path is completely discharged, and when the air is completely discharged,
Switch off to stop rotation of motor 1. When the air in the transfer path of the liquid detergent is completely exhausted, a hand is put out, and when the motor 1 is rotated, a fixed amount of the liquid detergent is immediately discharged. However, if the liquid detergent is exhausted and air enters the transfer path, the liquid detergent will not be discharged even if the hand is extended and the motor 1 is rotated. The manual switch 18 is provided so that the liquid detergent is always discharged when the motor 1 is rotated by extending the hand.
Is forcibly rotated.

Further, in the control circuit of FIG. 3, a limit switch 19 is connected in parallel with the buffer transistor Q3. The limit switch 19 stops the rotation of the motor 1 when the pump discharges a fixed amount of the liquid detergent. The limit switch 19 detects that the bellows-shaped container, which is a pump, has made one reciprocation, and stops the rotation of the motor 1. When the lower end of the bellows-like container moves to the bottom dead center, the limit switch 19 is turned off by pressing the plunger. Limit switch 19
Is pushed by a stopper arm provided on a cam shaft for reciprocating the bellows-like container. Although not shown, the stopper arm is fixed to the rear end of the cam shaft. The limit switch is provided at a position where the plunger is pushed by the stopper arm when the bellows-like container moves to the bottom dead center. And the limit switch is
Off when the plunger is pressed by the stopper arm,
Turns on when the plunger is not pressed.

In the above control circuit, the rotation position of the cam shaft is detected by the limit switch 19 and the rotation of the motor 1 is stopped. Therefore, the control circuit is stopped after the pump discharges a fixed amount of liquid detergent. In other words, when the hand is out, a constant amount of liquid detergent is discharged from the nozzle from the nozzle. The control circuit of the present invention has a structure for stopping the pump,
Not specified for limit switch. For example, the rotation time of the pump may be controlled by a timer, and the pump may be rotated for a set time of the timer without using a limit switch.

The forcible off timer circuit 15 includes a motor 1
After the rotation of the motor 1 is stopped, the counting is started and the rotation of the motor 1 is forcibly stopped for a set time. The forced off timer circuit 15 of FIG. 3 includes a short-circuit transistor Q4 that connects the output side of the storage circuit 13 to the ground and cancels the ejection signal, and a timing capacitor C that specifies the "L" set time. Forced off timer circuit 15
Short-circuits the "H" signal, which is the discharge signal of the storage circuit 13, to ground when the short-circuit transistor Q4 is on,
This prevents the switching element Q1 from turning on.

When the motor 1 is rotating, the forcible off timer circuit 15 controls the timing capacitor C
Is discharged via the diode D3. This is because the limit switch 19 in the ON state connects the + terminal of the timing capacitor C to the ground via the diode D3. When the charge of the timing capacitor C is discharged and the potential at both ends is 0 V, the short-circuit transistor Q4 is turned on. Short-circuit transistor Q4
Is the same as the collector potential. When a discharge signal is output from the storage circuit 13 in this state, the discharge signal is short-circuited to the ground by the short-circuit transistor Q4 and is not output to the switching circuit 14. The ejection signal which is the "H" signal is connected to the short-circuit transistor Q
4 is short-circuited to 0V.

The timing condenser C is connected to the motor 1
After the rotation of is stopped, the battery is gradually charged and the voltage on the + side rises. When the voltage of the timing capacitor C increases, the base potential of the short-circuit transistor Q4 increases to the emitter potential, and the short-circuit transistor Q4 is turned off. Therefore, the short-circuit transistor Q4
Keeps the ON state until the timing capacitor C is charged to a predetermined voltage, during which the ejection signal of the storage circuit 13 is canceled.

After the rotation of the motor 1 is stopped, the timing capacitor C is gradually charged because the limit switch 19 and the buffer transistor Q3 are turned off, and the + terminal of the timing capacitor C is not short-circuited to the ground. , + Side terminal is the switching element Q
This is because it is connected to the + side of the power supply via the transistor which is 1. In this state, the + side of the timing capacitor C is a transistor that is the switching element Q1, a base resistor R1 of the transistor,
It is connected to the + side of the power supply via a timing resistor R2 connected in parallel with the diode D3. Therefore, after the rotation of the motor 1 is stopped, the timing capacitor C is charged through the base resistor R1 and the timing resistor R2.

The control circuits shown in FIGS. 2 and 3 control the rotation of the motor as follows and discharge the liquid detergent when the hand is put out. When the hand is put out, the light emitted from the light emitting element 10 is reflected by the hand and received by the light receiving element 11. When the hand is not extended, the light emitted from the light emitting element 10 is:
The reflected light of the hand is not received by the light receiving element 11 without being reflected by the hand. The control circuit shown in the drawing operates the light emitting element 10 and the light receiving circuit 12 in synchronization, so that when light is emitted from the light emitting element 10, the light receiving circuit 12 is in a state capable of receiving the reflected light. It receives light and outputs a signal when it is received.

When the light receiving element 11 receives the reflected light of the hand, the light receiving circuit 12 inputs an “H” signal to the storage circuit 13. The first "H" signal input from the light receiving circuit 12 to the storage circuit 13 is input to the first storage circuit 13A. The first storage circuit 13A receives an input from the light receiving circuit 12. "
The ejection signal is output as the H ″ signal. The ejection signal output from the first storage circuit 13A is delayed and
B is input. Second storage circuit 1 to which the ejection signal is input
3B outputs an ejection signal. The second storage circuit 13B
Since the ejection signal output from the first accumulation circuit 13A is delayed and the ejection signal is output, the ejection signal is output later than the first accumulation circuit 13A. The light receiving element 11 is continuously
When receiving the reflected light from the hand, the light receiving circuit 12 continuously outputs the "H" signal one after another. However, when the light receiving circuit 12 temporarily outputs the “H” signal due to other noises or the like, when the first storage circuit 13A outputs the ejection signal, the second storage circuit 13B does not output the ejection signal, and , When the second storage circuit 13B outputs the ejection signal, the first storage circuit 1
3A does not output the ejection signal. Therefore, when the hand is extended and the light receiving element 11 continuously receives the reflected light of the hand, both the first accumulation circuit 13A and the second accumulation circuit 13B output the ejection signal.

The first storage circuit 13 A and the second storage circuit 1
When the ejection signal is output from both the 3Bs, the signal is input to the switching circuit 14. At this time, if the forced off timer circuit 15 is in a state in which the output of the storage circuit 13 is short-circuited and is not canceled, the discharge signal of the storage circuit 13 is input to the switching circuit 14.

When the ejection signal is input to the switching circuit 14, the switching element Q 1 of the switching circuit 14 is temporarily turned on, and the rotation of the motor 1 is started. When the motor 1 rotates, the cam shaft is rotated, the stopper arm does not press the plunger of the limit switch 19, and the limit switch 19 is switched from off to on. When the limit switch 19 is turned on, the motor 1 rotates continuously even if the switching element Q1 of the switching circuit 14 is turned off. The rotating motor 1 drives the pump 5 to discharge the liquid detergent.

The motor 1 rotates the camshaft once,
When the stopper arm of the cam shaft pushes the plunger of the limit switch 19, the limit switch 19 is switched from on to off. When the limit switch 19 is turned off, the switching transistor Q1 is turned off because the buffer transistor Q3 is already turned off. The reason that the buffer transistor Q3 is off is
This is because the storage circuit 13 is in a state of not outputting the ejection signal.

When the motor 1 is rotating, the limit switch 19 discharges the timing capacitor C of the forced off timer circuit 15 to set the potential at both ends to 0V. When both the limit switch 19 and the buffer transistor Q3 are turned off and the rotation of the motor 1 is stopped, the timing capacitor C is gradually charged via the switching element Q1, the base resistor R1, and the timing resistor R2.

Before the timing capacitor C is charged and reaches a predetermined voltage, a hand is put out and the first storage circuit 13 A and the second storage circuit 13
When the ejection signal is output from B, the output is short-circuited to ground by the short-circuit transistor Q4 of the forced off timer circuit 15. This is because the short-circuit transistor Q4 of the forced off timer circuit 15 is in the ON state. The ejection signal, which is an “H” signal, output from the storage circuit 13 is 0
V and does not switch the switching circuit 14 on.

When a certain period of time elapses after the rotation of the motor 1 is stopped and the timing capacitor C is raised to a predetermined voltage, the short-circuit transistor Q4 of the forced off timer circuit 15 is switched from on to off. In this state, when the ejection signal is output from the storage circuit 13,
The switching circuit 14 rotates the motor 1 by the discharge signal without being short-circuited to the ground by the short-circuit transistor Q4.

Therefore, when the short circuit transistor Q4 of the forced off timer circuit 15 is in the ON state after the motor 1 is stopped, the switching circuit rotates the motor 1 even if the hand is extended. This prevents the pump 5 from continuously discharging the liquid detergent.

[0046]

The liquid detergent discharging apparatus of the present invention has a feature that the remaining capacity of a battery can be accurately displayed by a low battery detection circuit with a simple circuit. In particular, the liquid detergent discharging device of the present invention can accurately detect the remaining battery capacity even when the liquid detergent is hardened inside the pump and an excessive starting current flows to the motor that drives the pump. Has the feature of detecting and displaying The reason is that the low battery detection circuit of the discharge device of the present invention connects the voltage drop compensation circuit to the battery voltage detection unit and compensates for the instantaneous voltage drop of the battery voltage by the voltage drop compensation circuit. is there. The voltage drop compensation circuit compensates for this voltage drop even when the pump becomes an excessive load when starting the motor and a large current temporarily flows and the battery voltage drops, and the low battery detection circuit To eliminate malfunctions.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid detergent ejection device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit of the liquid detergent discharging device according to the embodiment of the present invention.

FIG. 3 is a circuit diagram of a control circuit of the liquid detergent discharging device according to the embodiment of the present invention.

FIG. 4 is a bottom view of the liquid detergent ejection device according to the embodiment of the present invention.

[Explanation of symbols]

1: Motor 2: Case 2A: Stand case 2B
... Removable case 3 ... Detergent container 4 ... Nozzle 5 ... Pump 6 ... Battery 7 ... Bellows container 8 ... Cam shaft 9 ... Slider 10 ... Light emitting element 11 ... Light receiving element 12 ... Light receiving circuit 13 ... Storage circuit 13A ... First Storage circuit
13B ... second storage circuit 13C ... delay circuit 14 ... switching circuit 15 ... forcible off timer circuit 16 ... oscillation circuit 17 ... power supply switch circuit 18 ... manual switch 19 ... limit switch 20 ... low battery detection circuit 21 ... low battery blinking light source 22: Voltage detection circuit 23: Buffer 24: Voltage drop compensation circuit Q1: Switching element Q2: Input transistor Q3: Buffer transistor Q4: Short-circuit transistor Q5: Power supply transistor Q6: Light-emitting transistor Q7: Driver transistor Q8: Flashing transistor C: Timing capacitor R1: Base resistance R2: Timing resistance

Claims (2)

[Claims] A detergent container filled with a predetermined amount of liquid detergent, a pump sucking liquid detergent stored in the detergent container and discharging the liquid detergent from a nozzle; This pump
(5) The motor (1) that drives the motor, the battery (6) that drives the motor (1), and the motor (1) that detects that your hand is out
And a control circuit configured to drive the pump (5) to discharge the liquid detergent by rotating the pump, wherein the control circuit detects that the battery voltage has dropped and displays the detected low battery. The low battery detection circuit (20) includes a voltage drop compensation circuit (24) connected to the battery voltage detection section. A liquid detergent ejection device configured to compensate for a voltage drop. 2. The apparatus according to claim 1, wherein the voltage drop compensating circuit is a compensating condenser.