JPH0340638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an electric iron with a temperature setting device.

[Technical background of the invention and its problems]

Conventionally, some electric irons equipped with a temperature setting device detect and display the temperature of the iron base, but there is no one that displays whether the temperature has reached an appropriate temperature for the set temperature.

For this reason, it is conceivable to provide an appropriate temperature indicator and display the appropriate temperature to notify the user when the temperature of the iron base is close to the set temperature.

However, when ironing, the heat of the iron base is transferred to the cloth, causing a temporary drop in the temperature of the iron base, causing the appropriate temperature display to disappear. To prevent this, if you widen the temperature range for determining the appropriate temperature, there is a risk that the appropriate temperature will be displayed even though the iron base temperature is still high, which may cause problems such as damaging the fabric, especially when switching from a high temperature setting to a low temperature setting. be.

[Purpose of the invention]

This invention was made in view of the above circumstances, and provides an electric iron that can stably display the appropriate temperature without expanding the temperature range for determining the appropriate temperature, and that can quickly notify the appropriate temperature and improve work efficiency. The purpose is to

[Summary of the invention]

This invention detects the heating temperature of the iron base by a heater built into the iron base with a temperature detection element, sets the temperature of the iron base with a temperature setting device, and compares the set temperature with the detected temperature. The switching circuit is driven to control the power supply to the heater so that the temperature of the iron base is maintained near the set temperature, and the detected temperature is determined by the appropriate temperature judgment circuit that sets the appropriate temperature range in response to the temperature setting of the temperature setting device. When the temperature rises, the appropriate temperature is determined when the lower limit of the above appropriate temperature range is reached, and when the temperature decreases, the appropriate temperature is determined when the upper limit of the above appropriate temperature range is reached, and in response to the judgment output, the appropriate temperature display is maintained and the set temperature of the temperature setting device is changed. In response to this, the display retention of the appropriate temperature indicator is released.

[Embodiments of the invention]

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

As shown in FIG. 1, an iron base 1 includes a heater 2 and a temperature detection element 3. On the iron base 1, a storage part 4 for a tank containing water for steam generation and a handle 5 are formed, and an appropriate temperature indicator 6 is provided, and the iron base 1 controls the heater 2 and responds to the temperature detection element 3. A main body case 7 containing a built-in circuit is attached. Note that the storage section 4 is formed into a unit and is detachable.

FIG. 2 is a block diagram showing the circuit configuration, where 8 is a temperature setting device for setting the temperature of the iron base 1, 9 is the temperature detecting element 3, and the temperature of the iron base 1 detected by the temperature detecting element 3. This is a temperature detection circuit that outputs a temperature detection signal corresponding to. 10 is a comparator 11 which inputs and compares the temperature setting signal from the temperature setting device 8 and the temperature detection signal from the temperature detection circuit 9; and a switching operation is performed in response to the output of this comparator 11, and the heater 2
This is a heater control circuit consisting of a switching circuit 12 that controls energization. That is, the comparator 1
1 turns off the switching circuit 12 to prohibit energization to the heater 2 when the detected temperature reaches the set temperature, and turns on the switching circuit 12 to energize the heater 2 when the detected temperature falls below the set temperature. It is something that can be done. 13 is the temperature setting device 8
A temperature setting signal is input from the controller to set the upper and lower limits of the appropriate temperature range, and when the temperature detected by the temperature detection circuit 9 falls within the appropriate temperature range, the latch circuit 14 is controlled to display the appropriate temperature on the appropriate temperature display 6. This is an appropriate temperature determination circuit. The latch circuit 14 is the appropriate temperature determination circuit 1.
In response to the output of 3, the appropriate temperature indicator 6 is held in the display state, and in response to a change in the temperature setting signal from the temperature setting device 8, the appropriate temperature indicator 6 is released from holding the display.

Next, the operation of the embodiment of the present invention constructed as described above will be explained with reference to FIG.

For example, when the set temperature of the temperature setting device 8 is set to T ₁ °C and the power is turned on at time t ₁ , the temperature of the iron base 1 is lower than the set temperature T ₁ °C, so the switching circuit 12 is turned on and the heater 2 is turned on. energization starts. With this, iron base 1
temperature increases gradually. On the other hand, the set temperature is T ₁
By setting the temperature to ℃, the appropriate temperature determination circuit 13
T ₁ Set an appropriate temperature range of ±α℃. The temperature of the iron base 1 is detected by a temperature detection element 3.
Then, at time t ₂ , when this detected temperature reaches the lower limit of the appropriate temperature, T ₁ −α° C., the appropriate temperature determination circuit 13 determines that the temperature of the iron base 1 has reached the appropriate temperature, and controls the latch circuit 14 . In this way, the appropriate temperature indicator 6 lights up, and the appropriate temperature is displayed. Thereafter, the temperature of the iron base 1 is raised to about T ₁ ° C. and maintained at a substantially constant temperature by the heater control circuit 10 . When ironing is performed in such a state, the heat of the ironing base 1 is radiated to the cloth, so that the temperature of the ironing base 1 may temporarily drop below the lower limit of the appropriate temperature T ₁ -α°C. However, the latch circuit 14
Since the appropriate temperature display 6 maintains the appropriate temperature display, the user can iron the clothes without getting confused.

Thereafter, at time _t3 , the temperature setter 8 is adjusted to lower the set temperature to _T2 °C, and the latch circuit 14
The holding of the display is canceled and the detected temperature deviates from the new optimum temperature range T ₂ ±α°C by the appropriate temperature determination circuit 13, so the appropriate temperature display by the appropriate temperature indicator 6 is stopped. Of course, the switching circuit 12 is turned off and the power to the heater 2 is cut off. In this way, the temperature of the iron base 1 decreases. Then, at time t ₄ , when the detected temperature drops to the upper limit value of T ₂ +α° C., the latch circuit 14 is controlled by the appropriate temperature determination circuit 13 and the appropriate temperature display 6 displays the appropriate temperature. This appropriate temperature display is maintained until the set temperature is changed by the temperature setting device 8.

In this way, once the detected temperature of the iron base 1 falls within the appropriate temperature range set by the appropriate temperature determination circuit 13, even if the temperature of the iron base 1 deviates from the appropriate temperature range thereafter, the temperature set by the temperature setting device 8 is variable. The appropriate temperature display will be maintained unless
Even if the optimum temperature range is narrow, there is no inconvenience that the optimum temperature display disappears in the middle of ironing. In this way, a stable and appropriate temperature display can be achieved. Furthermore, since the appropriate temperature range can be narrowed, there is no significant difference between the set temperature and the displayed appropriate temperature, and there is no risk of causing troubles such as damaging the fabric.

Further, the appropriate temperature determination circuit 13 determines the appropriate temperature when the temperature of the iron base 1 reaches T _{1 −α℃ when the temperature rises, and determines the appropriate temperature when the temperature of the iron base 1 reaches T 1} −α℃ when the temperature decreases.
The appropriate temperature is determined when the temperature drops to T ₁ + α℃,
As a result, the appropriate temperature indicator 6 displays the appropriate temperature.
It is possible to quickly notify when the temperature has reached the appropriate temperature, thereby shortening the user's waiting time and improving work efficiency.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an electric iron that can stably display the appropriate temperature without expanding the temperature range for determining the appropriate temperature, can quickly notify the appropriate temperature, and can improve work efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a block diagram, and FIG. 3 is a graph showing an example of the change in iron base temperature over time. 1... Iron base, 2... Heater, 3...
Temperature detection element, 6... Appropriate temperature indicator, 8... Temperature setting device, 10... Heater control circuit, 13... Appropriate temperature determination circuit, 14... Latch circuit.

Claims (1)

[Claims] 1. A heater built into the iron base, a temperature detection element that detects the heating temperature of the iron base by this heater, a temperature setting device that sets the temperature of the iron base, and a set temperature of this temperature setting device and the above temperature. A heater control circuit that compares the temperature detected by the detection element and controls the power supply to the heater by driving a switching circuit so that the temperature of the iron base is maintained near the set temperature, and a temperature setting of the temperature setting device. An appropriate temperature determination circuit that responsively sets an appropriate temperature range and determines the appropriate temperature when the temperature detected by the temperature detection element reaches the lower limit of the appropriate temperature range when the temperature rises, and reaches the upper limit of the appropriate temperature range when the temperature decreases. , maintains the appropriate temperature indicator in a display state in response to the appropriate temperature judgment output of the appropriate temperature judgment circuit, and releases the display state of the appropriate temperature indicator in response to switching of the set temperature of the temperature setting device. An electric iron characterized by comprising a latch circuit.