JPS58112594A - Iron - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron having a function of automatically notifying that the base portion of the iron has reached a predetermined temperature.

Traditionally, this type of temperature display device used a lamp linked to a thermostat, but in order to judge when the lamp was on or off, you had to look at the iron, and it was completely invisible outside of your line of sight. If you cannot confirm 1
There were some drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an iron that is easy to use and allows users to easily check from a remote location that the temperature of the heat generating part has reached a predetermined value.

An embodiment of the present invention is shown in FIGS. 1 and 2. In other words, this iron is equipped with a function of automatically notifying the temperature of the base portion of the iron, and is located close to the base portion. a temperature detection circuit 2 that includes a heat-sensitive element 1 that generates a voltage across the terminals corresponding to the temperature of the base portion thereof and obtains a temperature detection output proportional to the voltage between the terminals; and a switching circuit that turns on in response to the temperature detection output. In conjunction with the circuit 3 and the temperature setting diagram JvDK shown in FIG. a detection temperature setting variable resistor VR that adjusts the level W@ of the temperature detection output so that the switching circuit 3 turns on when It is a turtle with a

In FIG. 1, 5 is a commercial power supply, and 6 is a transformer that steps down the voltage. A rectifying bridge circuit 7 rectifies alternating current into direct current, and is used to supply direct current power to the temperature detection circuit 2 and the buzzer circuit 4.

A thermostat is used as the heat-sensitive element 1, and the temperature detection circuit 2 includes the thermistor, the detected temperature setting variable resistor VR, and the other first . It is constituted by a pre-Fuji circuit consisting of a second resistive element R and R2.

The switching circuit 3 has a base and a collector connected between the terminals of the heat-sensitive element 1 of the temperature detection circuit 2.
) The output of this transistor q is connected to the gate terminal as a trigger signal. It is composed of a thyristor SCR which operates on its own gate terminal, and the resistance of the thermistor changes depending on the temperature change of the base part. When the transistor Q is controlled on and off, the switching circuit 3 operates and the buzzer circuit 4 is driven.

Further, even if the temperature between the terminals of the heat-sensitive element 1 is the same, that is, the resistance value of the heat-sensitive element 1 is the same, the voltage between the terminals of the heat-sensitive element 1 can be adjusted by adjusting the resistance value of the variable resistor VR, that is, by adjusting the temperature setting dial DK of the iron. The level can be changed according to the variable setting of the temperature, and by adjusting the variable resistor VR, the transistor Q receives an output corresponding to the temperature set by the temperature setting diamond A/D.
The machine is turned on so that it is turned on. That is, when the temperature of the iron is set to a predetermined value using the temperature setting dial A/D, the buzzer BZ can be automatically adjusted to sound at that temperature.

It should be noted that the heat-sensitive element 1 constituting the temperature detection circuit 2 is not limited to the thermistor, but may of course be composed of a thermocouple or other heat-sensitive body.

With this configuration, the iron temperature setting dial A
By setting /D to a predetermined temperature, the resistance value of the variable resistor VR is adjusted to a value corresponding to the set temperature of the base portion of the iron, and a buzzer sounds to notify that the base portion has risen to that temperature. The alarm can be automatically notified (by the Bz# ringing), so even if you are far away from the iron and doing other work, you can know about it. You will be able to iron more efficiently without the inconvenience of not being able to tell when the temperature has reached the appropriate temperature unless you pay close attention to the lights and look at the iron.

In this example, the notification of the temperature of the pace part of the iron will be explained, but it goes without saying that the present invention can also be applied to the notification of the temperature of other heating devices.

Another embodiment of the invention is shown in FIG. That is, in this iron, in the buzzer circuit 4' of the above embodiment, a second heat-sensitive element 8 made of a thermistor or the like is connected to a feedback circuit part made of a series circuit of a capacitor C3 and a resistive element R7, which determines the oscillation frequency. It is.

The heat-sensitive element 8, like the heat-sensitive element 1 constituting the temperature detection circuit 2, is placed close to the temperature-sensed portion, that is, the base portion of the iron.

With this configuration, as the temperature of the base increases, the pitch of the buzzer BZ changes, and even if you are at a distance, you can tell if the iron is overheating from the change in pitch, and you can prevent accidents caused by overheating. It can be prevented.

Other effects are similar to those of the previous embodiment.

In addition to this, it is possible to further add a timer circuit to the buzzer circuits 4 and 4' so that the drive of the buzzer BZ is automatically stopped when 6 predetermined hours have elapsed after the buzzer BZ started sounding. It is.

With this configuration, even if you are unable to iron for a while because you are busy with other work, the buzzer BZ will not continue to sound and the buzzer sound can be prevented from becoming a noise. can do.

As described above, the iron of the present invention includes a temperature detection circuit that includes a heat-sensitive element that detects the temperature of the iron base portion and generates a voltage between terminals corresponding to this temperature, and obtains a temperature detection output proportional to the voltage between the terminals. The temperature detection output is set to the temperature setting element in conjunction with a switching circuit that is turned on in response to the temperature detection output, and a temperature setting means that selects and sets the amount of heat generated by the ILIN heater. ! a detection temperature setting variable resistor that adjusts the level so that the switching circuit turns on when the temperature reaches a level corresponding to the temperature set by I; and a buzzer circuit that is driven by the turning-on operation of the switching circuit. As a result, it is possible to easily know from a remote location that the temperature of the heat generating part of the iron has reached a predetermined value, and the iron can be used efficiently and safely.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is an external perspective view thereof, and FIG. 3 is a partial circuit diagram showing another embodiment of the invention.

Claims (1)

[Scope of Claims] (1) A temperature detection circuit that includes a heat-sensitive element that detects the temperature of an iron base portion and generates a voltage between terminals corresponding to the temperature, and obtains a temperature detection output proportional to the voltage between the terminals; The temperature detection output corresponds to the temperature set by the temperature setting means in conjunction with a switching circuit that is turned on in response to the temperature detection output and a temperature setting means that selects and sets the amount of heat generated by the iron heater. An iron comprising: a detection temperature setting variable resistor that adjusts the level so that the switching circuit turns on when the iron reaches a certain level; and a buzzer circuit that is driven by the turning-on operation of the switching circuit. (2) The temperature detection circuit is a bridge circuit consisting of a thermistor, the variable resistor, and a first and second resistance element, and the switching circuit is for trigger signal generation, with a collector and a base connected to both ends of the thermistor, respectively. The iron according to claim (1), comprising a transistor and a thyristor that is turned on by receiving the output of the transistor as a gate signal. (3) The buzzer circuit is disposed near the iron base portion. 2. The iron according to claim 1, wherein the thermistor is included in a part of an oscillation frequency circuit element so that the oscillation torsional frequency changes as a result of a change in resistance of the thermistor.