JPH0111196Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clothes dryer equipped with a buzzer that notifies that the clothes stored in the drum have finished being dried.

Clothes dryers use timers to control their operation, and are configured to turn off the heater and motor after a certain period of time. However, even if you try to use the timer's cam mechanism to directly control the operation of the buzzer, the dryer is controlled in units of hours, whereas the buzzer is controlled for several tens of seconds before the end of drying. The time difference was so large that it was difficult to control the operation of the buzzer using a timer for operation control. Therefore, a special timer circuit for the buzzer was used.

Alternatively, some machines have been seen that control the operation of the buzzer using the timer used to control the operation of the dryer, but the circuit is configured so that the buzzer sounds when the timer is set, and therefore, the buzzer sounds due to malfunction at that time. There were flaws.

An object of the present invention is to provide a clothes dryer in which the operation of a buzzer can be controlled by a timer used to control the operation of the dryer without using a special timer circuit, and there is no erroneous sound when the timer is set.

In order to achieve the above object, the features of the clothes dryer according to the present invention include a PTC thermistor connected in series with a buzzer, and a relay associated with the thermistor and each timer contact for operation control. This is an indirect use of motion.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a clothes dryer to which the present invention relates, in which 1 is an outer box;
2 is a door for putting in and taking out clothes; 3 is a drum rotatably provided inside the outer box; 4 is a feed cylinder; one end of the feed cylinder 4 is located in the front opening 3a of the drum 3; A heater 5 such as a heater is installed, and a dustproof filter 6 is provided at the other end.
At the rear of the drum 3 is a lint filter 7, and behind it is an exhaust pipe 9 with a fan 8 inside. 10, 10' connect the power of the motor 11 to the drum 3.
and the belt that conveys it to Fan 8. Furthermore, the outer box 1 has a buzzer 12 for notifying completion of drying, an air inlet 13, and an air outlet 14.

FIG. 2 shows the electric circuit of the dryer, in which the motor 11 is connected in series to a power source 16 through a timer contact 15a, and the heater 5 is connected in series through another timer contact 15b. A timer motor 15c that operates these timer contacts is connected in parallel to the motor 11, and the timer contacts 15a, 1
5b and timer motor 15c constitute a timer circuit 15. The feature of the dryer of this invention is that this circuit includes a relay 17 and a PTC thermistor 18.
This PTC thermistor 1
8 is connected in series to the buzzer 12. A series circuit including a buzzer and a PTC thermistor is connected to the circuit between timer contact 15b and heater 5, and COM contact 17a of relay 17 is connected to the series circuit. Furthermore, COM contact 17a is relay 1
7 to the power supply 16. Also, relay NC contact 1 is connected to the circuit between timer contact 15b and heater 5.
7b and thus the timer contact 15 for the heater.
b is connected to the NC contact 17b. Therefore, buzzer 12, PTC thermistor 18, COM contact 1
A series circuit of 7a and relay 17 is connected in parallel to heater 5. The NO contact 17c of the relay is connected to the circuit between the timer contact 15a and the motor 11. In addition, a PTC thermistor 18 is attached to the buzzer 12.
By providing the heater 5 and buzzer 1 in series,
In one example, the ratio of the two resistors is about 1:100. In the figure, 19 is a micro switch activated by opening and closing the door 2, 20 is a capacitor, 21
is a microtemp.

When in use, after putting the clothes to be dried into the drum 3 through the door 2, the micro switch 19 is closed and the timer 15 is set to an appropriate time.
a and 15b are closed to energize the heater 5 and motor 11. At the same time, relay 17 is energized,
The relay contact circuit switches from the NC contact 17b to the NO contact 17c, but since the relay 17 is in a parallel relationship with the motor 11, it continues to be energized. In addition, when switching from NC contact to NO contact, buzzer 12, PTC
There is a moment when thermistor 18 and relay 17 become a series circuit, but the resistance value of relay 17 and buzzer 1
2 and the resistance value of the PTC thermistor 18 is, for example, approximately 8:2, so that the necessary voltage is applied to the relay and abnormalities such as chattering do not occur. If relay 17 is energized, buzzer 12
The circuit of PTC thermistor 18 and PTC thermistor 18 becomes a circuit in series with heater 5, but since timer contact 15b is closed, the potential between buzzer 12 and PTC thermistor 18 is the same, and the buzzer does not operate. The drum 3 and the fan 8 are rotated by the drive of the electric motor 11, and the air introduced from the air inlet 13 by the fan 8 is heated by the heater 5, becomes warm air, passes through the drum 3, and removes the clothes inside the drum. It is dried and discharged through the exhaust stack 9 and air outlet 14.

When the set time of the timer 15 has elapsed, the timer contact 15b first opens, and therefore the buzzer 12 and the PTC
Thermistor 18 and heater 5 form a series circuit. Since the ratio of the resistance value of the heater 5 and the resistance value of the buzzer 12 is, for example, 1:100 as mentioned above,
Since only a minute voltage is applied to the heater 5, the heater 5 does not heat up and only the buzzer 12 sounds to notify that drying is complete. After several tens of seconds have passed since the buzzer 12 was activated, the resistance value of the PTC thermistor 18 increases, the voltage applied to the buzzer 12 decreases, and the buzzer 12 stops. Next, the timer contact 15a is opened by the action of the timer 15, and the electric motor 11 etc. are no longer energized, and the dryer is completely stopped.

In the circuit configuration of the present invention, the timer contacts 15a, 1
Since the buzzer 12 is not energized until both contacts 5b are closed, due to the mechanism of the timer cam that opens and closes each timer contact, when the timer is set, the timer contact 15a is closed and the timer contact 15b is open. Due to the action of the relay 17, the buzzer 12 does not sound in that state, but the buzzer sounds when the timer contact 15b is opened in the final step.

As described above, according to the present invention, by indirectly using the timer used to control the operation of the dryer, the buzzer that notifies the end of drying can be activated for an appropriate amount of time. There is no need to provide a special timer circuit for control. Additionally, the buzzer only operates near the end of drying, regardless of the timer setting. The buzzer is activated by adding an extremely simple circuit, and therefore can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a clothes dryer according to an example of the present invention, and FIG. 2 is a diagram showing an example of an electric circuit used in this clothes dryer. In the figure, 3...drum, 5...heater, 8...fan, 12...buzzer, 15...timer, 15a
...Timer contact for motor, 15b...Timer contact for heater, 16...Power supply, 17...Relay, 1
7a...COM contact, 17b...NC contact, 17c
...NO contact, 18...PTC thermistor.

Claims (1)

[Scope of utility model registration request] A heater 5 that heats the air passing through the drum 3
, a motor 11 for driving the drum 3 and the fan 8, and a buzzer 12 for notifying the end of drying, and the heater 5 and the motor 11 are connected to a power source via respective timer contacts 15b and 15a. In the clothes dryer, a PTC thermistor 18 connected in series to the buzzer 12;
The COM contact 17a of the relay 17 includes a relay 17 connected to a series circuit including the buzzer 12 and the PTC thermistor 18;
The contact 17a is connected to the power supply via the relay 17, and the timer contact 15b for the heater 5 is connected to the NC contact 17b of the relay 17 and to the motor 1.
The timer contact 15a for 1 is the NO of the relay 17.
It is connected to the contact point 17c, and the buzzer 12 and the
A clothes dryer characterized in that a series circuit of a PTC thermistor 18 and the relay 17 is in a parallel relationship with the motor 11 and the heater 5.