JPH0111191Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in the operating circuit of a washing machine.

Conventionally, when washing wool laundry in a washing machine, the drive motor that rotates the stirring blades is repeatedly energized for a short period of time (for example, 5 seconds) and then turned off for a short period of time. However, even when generating a weak water flow, when the drive motor starts energizing, the drive motor is
Since a rated voltage of 100 volts is applied and the laundry is rapidly accelerated, the rapid friction between the agitating blades and the laundry will cause a lot of damage to the laundry, and the rapid rotation of the water stream will cause the laundry to become damaged. There was a problem with it twisting and intertwining.

The present invention was developed in view of the above circumstances, and its purpose is to prevent rapid acceleration when starting the drive motor, reduce fabric damage to laundry, and reduce twisting and entanglement of laundry. It is to provide the operating circuit of the washing machine to obtain.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a single-phase AC power supply with a rated voltage Vs (100 volts), which is a commercial power supply, and bus bars 2 and 3 are connected to both terminals thereof. Reference numeral 4 denotes a clockwork type timer, which includes a power supply timer switch 5 consisting of an open/close switch, and a reversing timer switch 6 consisting of a changeover switch having a movable contact piece c and fixed contact pieces a and b.
It is equipped with In this case, in timer 4,
The power supply timer switch 5 closes when set and opens when the set time counting operation is completed, and the reversing timer switch 6 closes for a short period of time when it is set. Contact piece (c-a) for a certain period of time ta (e.g. 5 seconds)
Pausing for a short period of time tb (e.g. 5 seconds),
The closing of the contact pieces (c-b) for a short fixed time ta and the pause for a short fixed time tb are repeated. Reference numeral 7 denotes a drive motor that rotates a pulsator (none of which is shown), which is a stirring blade disposed at the bottom of the washing tub, and this motor coil 8,
9 and a capacitor 10. In the reversing timer switch 6, the movable contact c is connected to the bus bar 2 via the power supply timer switch 5, and one fixed contact a is connected to the voltage dividing resistor 11.
is connected to the normal rotation terminal 12 which is a common connection point of the motor coil 8 and the capacitor 10, and the other fixed contact b is connected to the motor coil 9 via a voltage dividing resistor 13.
and a reversing terminal 1 which is a common connection point of the capacitor 10.
4, and the common connection point of motor coils 8 and 9 is connected to bus bar 3. 15 and 16 are relays that connect one end of each excitation coil 15a and 16a to the bus bar 3, and also connect the excitation coil 1
The other end of the excitation coil 16a is connected to the fixed contact a of the reversing timer switch 6 via a rectifying diode 17 and a resistor 18 with the polarity shown, and the other end of the excitation coil 16a is connected to a rectifying diode 19 and a resistor 2 with the polarity shown.
0 to the fixed contact b of the reversing timer switch 6, and the normally open contacts 15b and 16b of the relays 15 and 16 are connected in parallel to the voltage dividing resistors 11 and 13, respectively. The voltage dividing resistors 11 and 13, the relays 15 and 16, the rectifying diodes 17 and 19, and the resistors 18 and 20 constitute a voltage control circuit 21. Capacitors 22 and 23 are time-limiting elements, and these are connected in parallel to the excitation coils 15a and 16a, respectively.

Next, the operation of this embodiment will be explained with reference to FIG. 2. When the timer 4 is set to a desired time after putting the wool laundry into the washing tub and supplying a predetermined amount of water, the timer 4 starts measuring time and the timer switch 5 for the power supply is closed. As a result of the timing operation of the timer 4, for example, the contact piece (c-a) of the reversing timer switch 6 is
When the gap is closed (time to), the contacts (c-
During a), the capacitor 22 starts charging via the resistor 18 and the rectifying diode 17, and thus the capacitor 22 starts timing operation. Also, at this time, the excitation coil 15a is not energized and the relay 15 returns to open the normally open contact 15b. Therefore, the normal rotation terminal 12 of the drive motor 7 is energized via the voltage dividing resistor 11, and the The drive motor 7 starts rotating in the forward direction. In this case, the normal rotation terminal 12 has a rated voltage
Since a voltage obtained by dividing Vs by the voltage dividing resistor 11 is applied, the applied voltage _V12 becomes a voltage Va lower than the rated voltage Vs, as shown in FIG. Therefore, the drive motor 7 is gradually accelerated, and a gently normal water flow is generated by the pulsator in the washing tub. Thereafter, when the charging voltage of the capacitor 22 reaches the operating voltage of the relay 15 after a set time tc has elapsed (time t ₁ ), the relay 15 operates to close the normally open contact 15b. The voltage dividing resistor 11 is short-circuited by this normally open contact 15b, so that the voltage V ₁₂ applied to the normal rotation terminal 12 becomes the rated voltage Vs, and the drive motor 7 rotates at the rated speed. Then, when the closing time between the contacts (c-a) of the reversing timer switch 6 passes a short fixed time ta (for example, 5 seconds) (time t ₂ ), the reversing timer switch 6 closes the contacts (c-a). A neutral state occurs in which neither the space between -a) nor the space between (c and b) is closed, resulting in a rest state. When this pause state continues for a short fixed period of time tb (for example, 5 seconds) (time t ₃ ), the contacts (c and b) of the reversing timer switch 6 are closed, and the power supply timer switch is closed. 5. Between the contacts (c and b) of the reversing timer switch 6, resistor 2
0 and the rectifying diode 19, the capacitor 23 starts charging, and the capacitor 23 starts timing operation. Also, at this time, excitation coil 1
6a is not energized, and the relay 16 returns to open the normally open contact 16b.Therefore, the reverse terminal 14 of the drive motor 7 is energized via the voltage dividing resistor 13, and the drive motor 7 is rotated in the reverse direction. Start rotating. In this case, since a voltage obtained by dividing the rated voltage Vs by the voltage dividing resistor 13 is applied to the reversing terminal 14, the applied voltage V ₁₄ is a voltage Va lower than the rated voltage Vs, as shown in FIG. Become. Therefore, the drive motor 7 is gradually accelerated, and a gently reversed water flow is generated in the washing tub by the pulsator. Thereafter, when the charging voltage of the capacitor 23 reaches the operating voltage of the relay 16 after a set time tc has elapsed (time t ₄ ), the relay 16 operates to close the receiving/opening contact 16b, and therefore The voltage dividing resistor 13 is short-circuited by this normally open contact 16b, so that the voltage _V14 applied to the reverse rotation terminal 14 becomes the rated voltage Vs, and the drive motor 7 rotates at the rated speed. And the contact piece of the reversing timer switch 6 (c-b)
When the closing time elapses after a short fixed time ta (time t ₅ ), the reversing timer switch 6 again enters the rest state for a short fixed time tb. By repeating the same operation, a reverse swirling weak water flow suitable for wool laundry will be generated in the washing tub.

In the above embodiment, the case where wool laundry is washed has been described, but the present invention is not limited to this, and can also be applied to, for example, when washing an extremely small amount of laundry at an extremely low water level.

Further, in the above embodiment, the voltage dividing resistors 11 and 13 are used in the voltage control circuit 21, but the same effect can be achieved by using, for example, a reactor instead.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with appropriate modifications within the scope of the gist.

As explained above, the present invention provides a washing machine operating circuit in which the drive motor that drives the stirring blades is repeatedly energized for a certain period of time and then cut off for a certain period of time. A timer element is provided to measure time, and a voltage control circuit is provided to control the voltage applied to the drive motor to a voltage lower than the rated voltage during the timer operation of the timer element. The set time is gradually accelerated to generate a gentle water flow on the stirring blades, and unlike the conventional method, there is no sudden friction between the stirring blades and the laundry, reducing damage to the laundry. It is possible,
Further, unlike the conventional method, the laundry is not caused to flow due to the rapidly rotating water flow, so there are practical effects such as less twisting and entanglement of the laundry.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an embodiment of the present invention;
FIG. 2 is a voltage waveform diagram for explaining the operation of the same embodiment. In the drawing, 4 is a timer, 6 is a reversing timer switch, 7 is a drive motor, 15 and 16 are relays, 21 is a voltage control circuit, and 22 and 23 are capacitors (time elements).

Claims (1)

[Scope of utility model registration request] In a washing machine operating circuit in which a drive motor that drives an agitation blade is repeatedly energized for a certain period of time and then cut off for a certain period of time, a timer element is provided that performs a timing operation for a set time when the drive motor is started to be energized. A voltage control circuit for controlling the voltage applied to the drive motor to a voltage lower than the rated voltage during the timekeeping operation of the timer element.