KR930011188B1 - Washing machine - Google Patents

Abstract

The device stops a motor when laundry is added or when a user puts a hand into a washing tub, and then if state is steady, turns on the motor and washes laundry with perceiving a water level and bubble quantity and fixing a laundry time again, comprises a transmitting circuit part and a receiving circuit part. The transmitting circuit part inquires light signal controlled by transistor and luminous diode, and the receiving circuit part checks that the output signals of a photo-transistor accepting the inquired light signal and a photo-transistor through inverter-gate are passed through differential circuit, and the signals are made 'AND' and then the microcomputer controls a motor by the signal.

Description

Washing machine safety device and washing time setting method

1 is a circuit diagram of a conventional washing machine.

2 is a signal flow diagram for explaining the operation of FIG.

3 is a configuration of the safety system of the washing machine of the present invention.

4 is an internal configuration diagram of a washing tank of the washing machine of the present invention.

5 is a graph showing a stable region and an unstable region according to FIGS. 3 and 4;

6A to 6F are the output waveform diagrams of the parts shown in FIG. 3 when the hand is placed in the washing tank.

7A to 7F are the output waveform diagrams of the parts shown in FIG. 3 when the hands are removed.

8 is a signal flow diagram for explaining the operation of FIG.

* Explanation of symbols for main parts of the drawings

1: micom 2: quantity detection unit

3: water level detecting unit 4: motor driving unit

5: motor 7: transmitting circuit

8: receiving circuit

The present invention relates to a safety device for a washing machine. In particular, the motor is stopped when the laundry is added or a hand is put in the washing tank while the washing machine is in operation. It relates to a safety device and a washing time setting method of the washing machine to detect and reset the washing time to proceed with the washing.

Conventional washing machine is, as shown in Figure 1 of the accompanying drawings, a water level detection unit (3) for detecting the water level in the washing tank, a quantity detection unit (2) for detecting the weight of the laundry put into the washing tank, washing start The microcomputer 1 for controlling the overall system operation of the washing machine by analyzing and determining the weight of the laundry detected from the quantity detecting unit 2 according to the on / off state of the / switch switch SW1, and the input AC power source (AC). ) Is switched on and off by the control signal of the microcomputer 1 and the power supply unit 6 to convert the constant voltage to a constant level and drive the triac TA1, and the stirrer in the washing tank. In the drawing, reference numeral R1 denotes a resistor connected between the power supply terminal Vcc and the washing start / stop switch SW1.

Referring to Figure 2 the operation of the conventional washing machine configured as described above is as follows.

First, when the power switch is turned on to wash the laundry put into the washing tank, the input AC power AC is converted into a constant level constant voltage through the power supply unit 6 and input to the microcomputer 1.

Thereafter, when the laundry start switch SW1 is turned on, the microcomputer 1 initially turns on the water supply valve to supply water, and the quantity detection unit 2 detects the weight of the laundry put into the washing tank and then The detected quantity data is input to the microcomputer 1.

Therefore, the microcomputer 1 determines the water level in the washing tank according to the weight of the quantity detected by the quantity detecting unit 2.

After the water level is detected from the water level detecting unit 3 and the detected water level is below the proper level, the microcomputer 1 controls the water supply valve to supply water to the washing tank until the proper water level is reached, and when the water supply is completed, the quantity detecting unit The washing time t is set according to the weight of the quantity detected from (2), and the motor driving unit 4 is turned on during the set washing time t.

Accordingly, the trigger pulse from the motor driving unit 4 is applied to the gate of the triac TA1, so that the triac TA1 is turned on, and the motor 5 is driven for the set washing time t. Will proceed.

After washing is performed during the washing time (t), the washing is ended by turning off the motor 5.

However, such a conventional washing machine has to reset the washing time if the washing machine adds or decreases laundry while driving. Once the washing time is calculated, the washing machine proceeds with the washing for that time and ends the washing. In addition, even when the door is opened during the driving operation, the washing tank continues to operate, so there was a problem that a safety accident occurs when the user puts his hand into the washing tank or adds laundry.

The present invention, in the case of adding the laundry or putting the hand into the washing tank during the operation of the washing machine in consideration of such a conventional problem when the transmission circuit unit and the receiving circuit unit senses the operation of the motor to stop and pull out the hand, that is, the normal state is When the motor is restarted and the washing time according to the quantity and the water level in the washing tank is reset, the safety device and the washing time setting method of the washing machine are created so as to proceed with the washing. The explanation is as follows.

3 is a block diagram illustrating a safety system of the washing machine of the present invention, and FIG. 4 is a block diagram of the washing tank of the washing machine of the present invention. As shown therein, the water level in the washing tank 10 is detected, and the water level sensing unit 3 and the From the quantity detection unit 2 for sensing the weight of the laundry put into the washing tank 10, and the quantity detection unit (2) and the water level detection unit (3) according to the on-off state of the washing start / stop switch (SW1) The microcomputer 1 for controlling the overall system operation of the washing machine by analyzing and determining the weight and level of the laundry to be detected, and a power supply unit for converting the input AC power to a constant voltage of a predetermined level and applying it to the microcomputer 1. 6 and on-off switching by the control signal of the microcomputer 1 to drive the triac TA1 and to rotate the stirrer 11 in the washing tank 10 to drive the washing motor 5. On the motor drive part 4 and the outer case 9 of the said washing tank 10 Transistors TR1, resistors R1, R2, R3, and light emitting diodes LED1 installed on one inner wall at regular intervals and driven according to a control signal output from the microcomputer 1 when the washing machine is operated, irradiating infrared rays. The transmitting circuit unit 7 made of (LED2) and the light emitting diodes (LED1) (LED2) of the transmitting circuit unit (7) at a predetermined distance (X) on the other inner inner wall of the outer case (9) and the transmission circuit unit Phototransistors PT1 (PT2), inverter gates I1 (I2), resistors R4-R7, capacitors C1 (C2), which receive infrared rays irradiated from (7) and input them to the microcomputer 1; In this figure, reference numeral Vcc denotes a power supply terminal, and R8 denotes a resistor connected between the washing start / stop switching and the power supply terminal Vcc.

FIG. 5 is a graph showing a stable region and an unstable region according to the distances and spacings between the light emitting diodes and the phototransistors of FIGS. 3 and 4, and as shown therein, the light emitting diodes (LED1) (LED2) of the transmitting circuit unit (7). Are installed on the inner wall of the outer case 9 at mutually constant intervals Y, and the phototransistors PT1 and PT2 of the receiving circuit unit 8 are arranged on the other inner wall of the outer case 9 at mutually constant intervals Y. In this case, transmission and reception are possible, that is, the infrared signal of the transmitting circuit unit 7 is transmitted to the receiving circuit unit according to the distance X between the light emitting diode LED1 (LED2) and the phototransistor PT1 (PT2). 8) As the unstable area cannot be detected accurately, it is possible to transmit and receive only when the distance (Y) is installed with the difference of the stable area according to the distance (X).

The operation and effects of the present invention configured as described above will be described in detail with reference to FIGS. 3 to 8 as follows.

First, when the power switch is turned on to wash the laundry introduced into the washing tank 10, the input AC power is converted into a constant voltage of a predetermined level through the power supply unit 6 and input to the microcomputer 1.

In this state, when the laundry start switch SW1 is turned on, the microcomputer 1 outputs a high pulse through its output terminal a, and the high pulse signal is a resistor R1 of the transmitting circuit unit 7. The voltage is divided through R2 and applied to the base of the transistor TR1 to turn on the transistor TR1.

As a result, the voltage of the power supply terminal Vcc is bypassed through the light emitting diodes LED1, LED2, resistor R3, and transistor TR1 of the transmission circuit unit 7 provided on the inner wall of the outer case 9. The light emitting diodes LED1 and LED2 are turned on to irradiate infrared rays to the phototransistor PT1 and PT2 of the receiving circuit section 8 provided on the inner wall of the outer case 9 so as to face the phototransistor TP1. (TP2) will be turned on.

At the same time, the microcomputer 1 turns on the water supply valve to supply water to the washing tank 10 and checks the amount of water in the washing tank 10 from the quantity detecting unit 2.

That is, the quantity detecting unit 2 detects the weight of the laundry put into the washing tank 10 and inputs the detected quantity data to the microcomputer 1.

Therefore, the microcomputer 1 determines the water level in the washing tank 10 according to the weight of the quantity detected by the quantity detecting unit 2.

Thereafter, the water level is sensed by the water level detecting unit 3 and if the branch level is below the proper level, the microcomputer 1 controls the water supply valve to supply water in the washing tank 10 until the proper level is reached, and when the water supply is completed, The washing time t is set according to the weight of the quantity detected from the quantity detecting unit 2, and during the washing time t, the motor driving unit 4 generates a trigger pulse by the control signal output from the microcomputer 1. By applying to the gate of the triac TA1, the triac TA1 is turned on so that the motor 5 rotates the stirrer 11 in the washing tank 10 for the set washing time t to proceed with washing. do.

At this time, if the washing machine is added to the laundry or the hand is inserted into the washing tank 10 as shown in the direction (A) of FIG. 4, the infrared signal irradiated from the light emitting diode LED1 of the transmitting circuit unit 7 is first blocked and opposed to this. Since the phototransistor PT1 of the installed receiving circuit section 8 is turned off and the phototransistor PT2 is turned on, the voltage of the power supply terminal Vcc is applied to the resistor R4 of the receiving circuit section 8. A high pulse signal as shown in FIG. 6a is input to one input of the AND gate AND2, and a high pulse signal as shown in FIG. 6c through a differential circuit composed of a capacitor C1 and a resistor R4. It is applied to the inverting input terminal.

Then, as shown in FIG. 6, when the infrared signal irradiated from the light emitting diode LED2 of the transmitting circuit unit 7 is blocked after a predetermined time T, the phototransistor PT2 of the receiving circuit unit 8 is turned off. The voltage is input to the input of the inverter gates I1 and I2 as a high pulse signal as shown in FIG. 6b through the resistor R6.

The high pulse signal input to the inverter gate I1 is inverted into a low pulse signal through the inverter gate I1 and applied to the other input terminal of the AND gate AND1, and the high pulse input to the inverter gate I2. The signal is inverted into a low pulse signal through the inverter gate I2 and differentiated into a low signal as shown in FIG. 6d through a differential circuit composed of a capacitor C2 and a resistor R7 to invert the input terminal of the AND gate AND2. Is applied to.

Therefore, the AND gate AND1 ANDs the low pulse signal through the inverter gate I1 and the high pulse signal through the capacitor C1 and the resistor R5 of the differential circuit as shown in FIG. A low pulse signal such as a diagram is output and applied to the input terminal b of the microcomputer 1, and the AND gate AND2 is a high pulse signal through the resistor R4 and the capacitor C2 of the differential circuit as shown in FIG. And the low signal through the resistor R7 is output, and a high pulse signal as shown in FIG. 6f is output to its output terminal and applied to the input terminal C of the microcomputer 1.

Accordingly, the microcomputer 1 checks its input terminals (b) and (c), and when a high pulse signal is inputted to the input terminal (C), it is determined that the laundry is put into the washing tank 10 or the user's hand enters the output terminal. Through (d), the motor driving unit 4 is turned off and the driving of the motor 5 is stopped.

Then, when the user puts the laundry into the washing tank 10 and then lifts his hand in the direction B as shown in Fig. 4, the receiving circuit unit 8 is irradiated by the infrared signal irradiated from the light emitting diode LED2 of the transmitting circuit unit 7 as described above. Phototransistor PT2 is first turned on, and the phototransistor PT1 continues to be in an off state, so the voltage of the power supply terminal Vcc is transferred through the resistor R6 and the phototransistor PT2. Bypass the low pulse signal as shown in Figure 7b is applied to the input of the inverter gate (I1) (I2).

After a predetermined time, the phototransistor PT1 of the receiving circuit 8 is turned on by the infrared signal emitted from the light emitting diode LDE2 of the transmitting circuit 7 so that the voltage of the power supply terminal Vcc becomes the resistor R4. A low pulse signal as shown in FIG. 7a is input to one input terminal of the AND gate AND2, and is differentiated into a low signal as shown in FIG. 7c through the capacitor C1 and the resistor R5 to invert the AND gate AND1. Applied to the input terminal.

The low pulse signal inputted to the inverter gate I2 is inverted to a high pulse signal through the inverter gate I2 and differentiated into a high signal as shown in FIG. 7d through the capacitor C2 and the resistor R7 to be connected to the AND gate. The low pulse signal applied to the inverting input terminal of AND2 and input to the inverter gate I1 is inverted into a high pulse signal through the inverter gate I1 and applied to the other input terminal of the AND gate AND1.

Accordingly, the AND gate AND1 ANDs the low signal differentiated through the capacitor C1 and the resistor R5 and the high pulse signal through the inverter gate I1 as shown in FIG. 7C to input the input terminal b of the microcomputer 1. A high pulse signal as shown in FIG. 7e is applied to the gate, and the AND gate AND2 ANDs the low pulse signal as shown in FIG. 7a as well as the high pulse signal through the capacitor C2 and the resistor R7 of the differential circuit. The low pulse signal as shown in Fig. 7f is applied to the input terminal C of (1).

Accordingly, the microcomputer 1 checks its input terminals (b) and (c), and when a high pulse signal is input to the input terminal (b), the microcomputer 1 determines that the user's hand is removed from the washing tank 10 and the output terminal (d) thereof. Drive the motor (5), and again detect the quantity from the quantity detection unit (2) and reset the water level in the washing tank (10) according to the weight of the detected quantity to the appropriate level when water is insufficient When the water supply is completed and the water supply is completed, the washing time t is reset according to the weight of the quantity detected by the quantity detecting unit 2, and the washing is performed by driving the motor 5 during the washing time t, and then washing is set. After the time t has elapsed, the driving of the motor 5 is indicated and the washing is finished.

As described in detail above, in the present invention, when the washing machine is added to the laundry or the hand is put in the washing tank, the transmission circuit and the receiving circuit unit have the same to stop the motor, and when the hand is removed, the safety accident is caused by restarting the motor. It can be prevented in advance, and by washing by resetting the washing time according to the quantity and the water level in the washing tank, not only preventing the damage of the laundry due to lack of water, but also improving the washing rate.

Claims (3)

In the washing machine which sets the washing time according to the quantity and the water level detected by the quantity detecting unit (2) and the water level detecting unit (3) and controls the motor driving unit and the motor during the washing time, the washing machine operates (1) a phototransistor that transmits an optical signal irradiated from the transmitting circuit unit 7 for irradiating an optical signal controlled by the transistor TR1 and the light emitting diode LED1 (LED2) according to the control signal; After receiving at (TR1) (TR2), the output signal of the received phototransistor (PT1) and the output signal of phototransistor (TR2) through the inverter gate (I2) are passed through the respective differential circuits and the differential signal Is composed of a receiving circuit section 8 which causes the microcomputer 1 to control the motor by activating the output signal of the phototransistor PT2 through each of the phototransistor PT1 and the inverter gate I1. Safe cabinet of a washing machine . The light emitting diodes (LED1) (LED2) of the transmitting circuit portion (7) are provided on one side of the inner wall of the outer case (9) at predetermined intervals (Y), and the phototransistor (PT1) of the receiving circuit portion (8). PT2 is a safety device for a washing machine, characterized in that the light emitting diodes (LED1) (LED2) and a predetermined distance (X) is installed opposite the inner wall of the outer case (9). When the laundry is added to the washing tank and the user's hand is inserted during the washing operation of the washing machine, the driving of the motor is stopped, and when the user's hand is removed, the motor is driven and the quantity is detected by the quantity detection unit. How to set the washing time of the washing machine characterized by resetting the water level of the washing tank according to the quantity of water, and when the water supply is completed to the set water level, the washing time (t) according to the quantity is reset and washing is performed during the washing time (t). .