JPS6241700A - Iron - 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 Industrial Application The present invention relates to an iron having a function of preventing overheating accidents caused by forgetting to disconnect the power cord of the iron.

Conventional technology Conventionally, this type of iron uses a thermistor to detect temperature, a temperature control circuit that activates a relay, and a relay that turns the heater current on and off to control the temperature.If you forget to turn off the power,
Some heaters detect this with a power-off detection circuit and turn off the temperature control relay to prevent the heater from overheating.

Problems to be Solved by the Invention As described above, when a temperature control relay is used, the contacts of the relay turn on and off the large current of the heater very many times. Therefore, the specifications required for the contacts of the relay are strict, and the external size of the relay is inevitably large. The circuit section using this relay becomes large, and the space for mounting it inside the iron becomes limited. Conventionally, irons have been provided with a cord reel at the rear of the iron body, making it easy to dispose of the cord after using the iron. However, when trying to mount the circuit section inside the iron, the circuit section is large as mentioned above, so the cord reel had to be installed in a different location and the cord reel had to be installed in place.

The present invention solves the above-mentioned conventional problems and provides an iron in which a power-off detection circuit can be mounted inside the iron without removing the cord reel.

Means to Solve the Problem The present invention uses a thermostat to control the temperature and turn on and off the heater current, and detects that the power has been turned off by using an electronic circuit.
The output of this circuit drives the relay, and when the relay is turned off, the heater current is turned off.

In other words, a thermostat is used for a switch that turns on and off many times, such as temperature control, and a relay is used as a switch to turn off the heater when you forget to turn off the power. At this time, the relay used is a relay that is always on and turns off only in abnormal situations such as forgetting to turn off the power, and the number of times the relay contacts turn on and off is very small. Therefore, compared to the temperature control relay described in the conventional example, it is much smaller and can be integrated into a small circuit section. Therefore, the degree of freedom in installing the circuit section is large, and a cord reel can also be provided.

Example FIG. 1 is a block diagram of one embodiment of the present invention.

In Figure 1, 1 is an AC power supply, 2 is a base heater built into the base of the iron, and 3 is a thermostat that detects the temperature of the iron base and turns on the base heater 2 if the temperature is low. The temperature is controlled by turning on the current and turning it off if it is too high. 4 is a relay that is normally on and turns off if you forget to turn off the power. Reference numeral 5 denotes a power supply forgetting to turn off detection circuit section, and the relay 4 is driven and controlled by this output signal to turn off the heater current when the power supply is forgotten to be turned off.

As shown in FIG. 2, the power-off detection circuit section 6 includes a switch section 6 and a timer circuit section 7.

The switch unit 6 detects the reciprocating movement of the iron while the iron is in use, turns the switch unit 6 on and off, and resets the time count of the timer circuit 7 each time the iron is turned on or off.
Always keep the output of the timer circuit at low level. On the other hand, if the iron is left still, after a certain period of time, the timer circuit 7
It outputs a high level signal, turns off transistor Q, and turns off relay 4. The switch unit 6 of this power-off detection circuit unit 5 uses a ball, and when the iron is in use, the ball prevents the ball from rolling and blocks the path of light, or conducts the light, and when the iron is left still, the ball Its movement has stopped, and the path of light has been blocked, leaving it empty. This optical signal is detected by a photointerrupter to determine whether the iron is being used or the iron has been forgotten to turn off.

In FIG. 3, reference numeral 8 denotes a base of the iron, and a heater 2 for heating the base is built-in. The base temperature of this iron is detected by thermostat 3. 9 is a handle of the iron, and a relay 4 and a power-off detection circuit section 6 are housed in this handle.

As explained in Figure 1, temperature control is performed using thermostat 3.
Since the relay 4 turns off the heater current only when it is detected that the power has been turned off, the circuit configuration consists of only the power-off detection circuit section 6 and a part of the relay. The specifications required for the relay 4 are much lower than those of the conventional example that performs temperature control, and therefore the size of the relay is much smaller.If the conventional example is 100 in volume ratio, the relay 4 is 20. 26, which is about 1/4 the size of the conventional example, and the circuit can be configured small enough to be stored inside the handle e. 1o is a cord reel provided at the rear of the main body of the iron, and is configured to wind up the power cord 11. 12 is a plug of the power cord 11.

Effects of the Invention As described above, according to the iron of the present invention, a very simple circuit configuration of the forget-to-turn-off detection circuit and the relay makes it possible to construct a very /4% type circuit, which is similar to that of the embodiment. Thus, it is possible to provide an iron that can be stored in the handle of the iron and a cord reel can also be attached.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an electric circuit of an iron showing an embodiment of the present invention, FIG. 2 is a block diagram of the electric circuit, and FIG. 3 is a schematic diagram of the iron. 2...Base heating heater, 3...Thermostat, 4...Relay, 5...-Power off forgetting detection circuit section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A heater for heating the base of the iron, a thermostat that detects the temperature of the base of the iron and turns on and off the current of the heater for heating the base, a circuit for detecting that the power is turned off, and a heater current that is controlled by the circuit for detecting that the power is turned off. There is a relay to turn on and off the iron.