JPS585075B2 - Fully automatic washing machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fully automatic washing machine, and its purpose is to be able to secure the minimum drainage time depending on the drainage conditions, and to efficiently operate the washing machine without leaving water behind. The aim is to provide a device that can operate reliably.

Generally, a fully automatic washing machine automatically performs washing, draining, dehydrating, etc., and is usually controlled by a timer at set times.

Here, the washing time and spin-drying time can be set according to the characteristics of the machine, but the drain time can be set depending on the machine's characteristics as well as the installation conditions of the equipment, such as extending the drain hose or running the drain hose over a threshold. Therefore, in the case of installation conditions such as those mentioned above, the drainage flow rate decreases, and sufficient drainage cannot be achieved in the normal drainage time.

If the spin cycle is automatically started in such a situation, the rotation of the washing/spinner tank may stir up the remaining water and overflow, or detergent may remain in the water tank, which may cause the rotation of the washing/spinner tank to cause water to overflow. Foaming occurs, and as a result, the rotational speed of the washing and dehydrating tub cannot be increased sufficiently, making it impossible to dehydrate the water and causing the motor to overheat.

On the other hand, if the drainage time is made sufficiently long, there is no risk of such an accident occurring, but it results in unnecessary operation time when used in the majority of installation environments with good drainage conditions.

The present invention eliminates the above-mentioned conventional drawbacks, and the structure thereof will be explained below with reference to the drawings.

A power source 1 is connected to a common contact of a pressure switch 3 via various control circuits of a time switch 2.

Time switch T1. T2. T3. T4 is driven by a timer motor 4 and opened and closed by a cam.

Also, time switch T1. T2. T3 is closed on the b side during the water supply and washing processes, and is closed on the a side during the drainage and dewatering processes.

The time switch T4 is closed only during draining and dewatering.

The dewatering motor 8 is connected to the contact a of the time switch T1 via the normally closed contact 10 of the relay 9, and the normally closed contact 10 is connected to the contact a of the time switch T1 by the discharge current of the capacitor C3 charged from the start of draining until the pressure switch 3 is reset. The dewatering motor 8 is opened, the dewatering motor 8 is prevented from being energized, and the drainage time is adjusted.

That is, when draining starts, the capacitor C2 charges the current from the contact of the time switch T2, and even if the pressure switch 3 switches to the NC contact due to a drop in the water level in the tank, the current flows through the transistor 12 connected to the coil 11 of the relay 9. A collector current is applied to energize the coil 11 and open the normally closed contact 10.

When the discharge charge of the capacitor C2 disappears and the transistor 12 cannot be energized, the coil 11 of the relay 9
is castrated, and the dewatering motor 8 is rotated.

13 is a constant voltage diode, and C1 is a smoothing capacitor.

Water is supplied by energizing the water supply valve 5 from the normally closed NC contact point of the pressure switch 3 via the time switch T1b contact, and when a predetermined water level is reached, the pressure switch 3
is tripped and closed to the NO contact side, so that the water supply valve 5 is no longer energized and the washing motor 6 is energized via the time switch T2b contact to perform washing.

On the other hand, the timer motor 4 is connected via the time switch T3b contact.
is energized and when the predetermined washing process time limit is reached, each time switch T1. The contacts T2 and T3 are switched from b to a, the time switch T4 is closed, and the drain valve 7 is energized.

When each contact is switched from B to A, the timer motor 4,
Washing motor 6 is energized, resistor R2, R2, diode D
The voltage made constant by the constant voltage diode 13 is charged to the capacitor C2 via the resistor R2.

At the same time, current is applied to the base of the transistor 12 via the resistor R3.

When the water level in the tank continues to drain and the water level in the tank decreases, the pressure switch 3 detects it, resets it, and switches to the NC contact, but the coil 11 of the relay 9 connected in series with the diode D2 and transistor 12 controls the discharge current of the capacitor 2. Since the relay 9 is energized, the normally closed contact 10 of the relay 9 is opened and the dewatering motor 8 is not energized.

That is, since the discharge current of the capacitor C2, which was charged before the pressure switch 3 was reset, is applied to the base of the transistor 12, the collector current is applied to the base of the transistor 12.

Further, the charge in the capacitor C2 is discharged through the resistors R2 and R5, and when the transistor 12 can no longer be energized, the coil 11 of the relay 9 is energized, the contact 10 is closed, and the dehydration motor 8 is rotated to perform the dehydration operation. At the same time, the timer motor 4 is energized via the time switch T3a contact to perform dehydration for a predetermined time.

Figure 2 shows the time course of the terminal voltage of capacitor C2 and the water level when the above-mentioned fully automatic washing machine is operating. , B', C' and F'.

F' is a case of poor drainage conditions.

The subsequent drainage time is controlled according to the time taken from the start of drainage to the reset water level of the pressure switch 3, that is, the drainage capacity according to the installation conditions of the machine.

G indicates the voltage that energizes transistor 2.

Since the present invention has the above-described configuration and function, the draining time can be adjusted appropriately depending on the installation conditions of the washing machine, and the minimum draining time can be ensured.

Therefore, there is no risk of inability to perform dehydration work due to insufficient drainage, overheating of the motor, etc., and there is no unnecessarily long drainage operation, which takes up a larger proportion of the number of washing operations and time compared to other operations. The effects are great, such as the ability to perform drainage operations efficiently and safely.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the principle of a fully automatic washing machine according to the present invention, and FIG. 2 is an explanatory diagram showing the time course of the terminal voltage of capacitor C2 and the water level in FIG. 1. 3 is a pressure switch, 4 is a timer motor, 7 is a drain valve, 8
is a dehydration motor, 9 is a relay, 12 is a transistor, C2
is a capacitor, and T1 to T4 are time switches.

Claims (1)

[Claims] 1 Fully automatic washing with a pressure switch that runs a series of programs such as washing, draining, and spin-drying, and when the water supply reaches a predetermined water level during washing, it trips, energizes the washing motor, and resets at the predetermined water level by draining water. The machine is equipped with a capacitor that is charged between the start of drainage and the reset, and the discharge current of this capacitor opens a relay contact connected to the dehydration motor, preventing the dehydration motor from driving until the discharged charge is exhausted. This fully automatic washing machine is characterized in that, by doing so, the pressure switch is reset for a time corresponding to the time from the start of draining to the reset, and then draining is carried out, and then spin-drying is carried out.