JPS63127787A - Controller for two tank type washing 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 Field of the Invention The present invention relates to a control device for a two-tub washing machine having a washing tub and a dewatering tub, and particularly to a notification device thereof.

2. Description of the Related Art Conventionally, a control device for a two-tub washing machine of this type has a configuration as shown in FIG. In FIG. 3, 1 is a control circuit that controls the washing motor and the dehydration motor, 400 is a buzzer circuit, 42 is a transistor that controls on/off of the buzzer notification, and 43 is a base resistor connected to the control circuit 1.

The buzzer circuit 400 is a self-oscillating circuit using a three-terminal piezoelectric buzzer 401. The piezoelectric buzzer 401 is connected between the collector and emitter of a transistor 402, and the feedback terminal F is connected to the base terminal of the transistor 402 via a pace resistor 40°4. Ru. This circuit is a modification of the Colpitts oscillator circuit that oscillates at the resonant frequency of the piezoelectric buzzer 401. When the transistor 42 is turned on, a notification sound at the resonance frequency of the piezoelectric buzzer 401 is emitted, and the on/off signal from the control circuit 1 controls the on/off of the buzzer notification.

Problems to be Solved by the Invention In such a conventional configuration, only one frequency of the notification sound can be selected, and the notification depending on the state has only the sound interval or time parameter, so it is difficult for the user to understand. The problem was that it was difficult.

The present invention is intended to solve these problems, and aims to change not only the temporal parameters of the notification sound but also the frequency, thereby making it easier for the user to understand the notification according to the state.

Means for Solving the Problem In order to solve this problem, the present invention is equipped with a buzzer that can signal different frequencies, and a control circuit allows the buzzer to be activated at different frequencies at the end of the washing operation and at the end of the spin-drying operation. It is configured to be driven.

Function: With this configuration, by changing the frequency of the notification sound and changing the tone of the notification depending on the state such as when washing or dehydration is completed, it is possible to easily tell the user which state the notification is in.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. In the figure, 1 is a control circuit such as a microcomputer, and 2 is an input device operated by a user, which is connected to an input port of the microcomputer. 3
is a display device, and 4 is a buzzer with variable notification frequency that displays the status.

Make announcements. 6A is a drive circuit A, which drives the washing side load 6A based on a signal from the control circuit 1.

The washing side load is composed of a washing motor 61A, a motor capacitor 62A, a water supply valve 63A, and a drain valve 64A, and the switching elements of the AC power supply 7 and the drive circuit 6A are connected in series. The drive circuit 5B drives the dehydration side load 6B, and includes a dehydration motor 61B and a motor capacitor 62B.
1 water supply valve e3B is driven to perform dehydration and rinsing. On the washing side, it is possible to control a series of processes of water supply, washing (rinsing), and drainage, and on the dehydration side, a dehydration and rinsing process of water supply, water supply, water supply, and water discharge can be performed. 8 is a sensor circuit that detects the water level in the washing tub.

In this embodiment, at the end of each of the washing and dehydrating processes, a buzzer 4 is used to notify the end of the process, and the tone of the end notification is changed. An example of a frequency control circuit that changes the tone of the buzzer is shown in Figure 2.
An inverter 101 is built in a control circuit 1 such as a microcomputer, and a vibrator 110, a capacitor 111,
112 and feedback resistor 113 constitute clock signal generation circuit 100. The output signal of the inverter 101 also serves as a clock signal for the microcomputer, and the frequency division ratio can be changed by the programmable counter 102. The division ratio and the buzzer output on/off signal are sent from the internal bus of the microcomputer to the buffer register, which controls the division ratio of the programmable counter and the AND gate connected to the output of the programmable counter to control the on/off of the buzzer output. A square wave signal is output to the buzzer output terminal BZ.

The programmable counter 102 can output a frequency at which a simple melody can be played if there are at least 6 pits or more. A resistor 43 and a transistor 42 are connected to the BZ output terminal, and a two-terminal piezoelectric buzzer 4o is connected between the transistor 42 and the DC power supply terminal Vcc, so that the two-terminal piezoelectric buzzer 40 can make notifications at different frequencies.

A discharge resistor 41 is connected between the terminals of the two-terminal piezoelectric buzzer 40 . As shown in Figure 2, if the clock signal of the microcomputer 1 can be frequency-divided and the division ratio and the on/off of its output can be controlled by the command code from the microcomputer, it is possible to change the notification frequency of the piezoelectric buzzer 4°. It is possible to notify the end by playing a melody. According to the present invention, when washing is finished, the machine sounds intermittently at a frequency of about 2 KHz, and when spin-drying is finished, it makes an intermittent sound at a frequency of about 3 KHz.

Further, as another embodiment, it is conceivable to play a melody at the end of washing, and simply play an intermittent sound at a constant frequency at the end of spin-drying.

As described above, according to this embodiment, the square wave signal that drives the two-terminal piezoelectric buzzer is generated by dedicated hardware using a programmable counter built into the microcomputer, which greatly reduces the burden on the microcomputer's software. .

Effects of the Invention As described above, according to the present invention, the notification frequency at the end of washing and the end of dehydration in a two-tub washing machine is changed, and the end notification makes it easy for the user to know which state of the two-tub washing machine has ended. It is very easy to understand what was done. In addition, there is no need for two buzzers on the washing side and the dehydrating side, and only one buzzer is required, resulting in a simple configuration and a reduction in manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a control device for a two-tub washing machine according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a buzzer frequency control circuit, and FIG. 3 is a circuit diagram of a buzzer frequency control circuit according to a conventional embodiment. This is a drive circuit. 1... Control device, 2... Input device, 4
...Buzzer, 5A, 5B...Drive device, 61A...Washing motor, 61B...
Dehydration motor, 1oO...Clock signal generation circuit, 1o2...Programmable counter. Name of agent: Patent attorney Toshio Nakao and one other person

Claims (2)

[Claims] (1) A drive device that controls a washing motor and a dewatering motor, a control circuit that controls the drive device in accordance with a signal from an input device, and a buzzer that is controlled by the control circuit and can notify different frequencies. , a control device for a two-tub washing machine in which the control circuit drives the buzzer by changing notification frequencies at the end of the washing operation and at the end of the spin-drying operation. (2) The control circuit includes a clock signal generation circuit, a programmable counter that frequency-divides the signal of the clock signal generation circuit, a microcomputer that operates according to the clock signal, and a frequency division ratio that is changed by an instruction code of the microcomputer. A control device for a two-tub washing machine according to claim 1, wherein the control device for a two-tub washing machine changes the notification frequency of a buzzer.