JPS58121998A - 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 The present invention relates to appropriate temperature notification for an iron, and provides an iron in which it is possible to easily check at any time whether the temperature of the base surface is at the appropriate temperature.

Conventional electric irons have a configuration in which lamps are connected to both ends of the heater, and the lamps are turned on when the heater is energized and turned off when the heater is not energized.

However, although this configuration is simple, it has the following drawbacks. (1) It is impossible to check whether the temperature is at the appropriate temperature without observing the operation of the lamp from turning on to turning off or from turning off to turning on. (2) When the rung is off, it is difficult to tell whether the iron is malfunctioning and is not receiving power, or whether it is adjusting the temperature normally.

Especially regarding (1) above, if you ignore that the light turns off midway through the operation of turning on-off and turning on, there is a risk that you may conclude that the temperature is not yet at the appropriate temperature even though it is. There is.

In the present invention, after setting the temperature, the power to the heater is switched from ON to OFF.
Detects the signal when switching from OFF to ON, triggers a latch circuit with the differential pulse of this signal, changes to the latched state, and uses the output of this latch circuit as a signal to notify the appropriate temperature. A latch release circuit is provided to release the latch when the set temperature is changed.

Next, by providing an oscillation 6 to blink the display device and controlling the oscillation cycle of the oscillator with the output signal of the latch circuit, it is possible to determine whether the temperature of the base surface is at an appropriate temperature by changing the blinking cycle of the display device. This will notify you whether the target has been reached or not.

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

First, I will explain the outline with Ne.

1 is a base surface of the iron, 2 is a temperature detection element for detecting the temperature of the base surface 1, and 3 is an output switching circuit consisting of a ring counter and the like. This output switching circuit 3 switches the resistance value of one side of the bridge circuit based on the ring counter output, and also drives the set temperature display means to display the set temperature.

4 is an operating means for the output switching circuit 3;
Shift the output of . 6 is a comparator that compares the output of the bridge circuit including the temperature detection element 2 and the resistor selected by the output of the output switching circuit 3, and drives the power control element 6 with the output. The temperature of the base portion 1 is maintained at a predetermined set temperature under the control of the control element 6. That is, by operating the operating means 4, the greenhouse of the base portion 1 can be maintained at an arbitrary set temperature, and the set temperature is notified by the set temperature display element. Reference numeral 8 denotes a variable-cycle oscillator that causes the display device of the output switching device 3 to blink. A latch circuit 9 changes the oscillation period of the oscillator 8 and latches this state, and a differentiation circuit 10 differentiates the output of the comparator 5 and drives the latch circuit 9. Reference numeral 11 denotes a latch release circuit, which is driven by the output of the operating means 4 to release the latch of the latch circuit 9.

Next, the configuration of the iron main body will be briefly explained in the second drawing. 12 is a cover 13 that covers the base surface 1 is the cover 12
A handle body is fixed on the top, and 13' is a water tank for supplying water for steam generation. 14 is a steam opening/closing button provided at the top of the water tank 13'; when the steam opening/closing button 14 is pressed, the water in the water tank 13' becomes droplets in the vaporization chamber 1', and steam can be generated; Steam C is ejected from a steam hole (not shown) formed in the base portion 1. Reference numeral 15 denotes a switch board disposed in the grip space of the handle 13, on which the operating means 4 is mounted. Reference numeral 16 designates a control board similarly arranged in the body space of the handle body 13. Note that the temperature sensing element 2 is attached to the base portion 1 in a thermosensitive manner.

Next, the electric circuit of the above-mentioned iron will be explained based on FIG. 3. Reference numeral 17 denotes an AC power source, to which a series circuit of the sheathed heater 7 and a normally open relay contact 18 is connected.

This relay contact 18 closes when current flows through a relay coil 19, which will be described later, and energizes the Hilturf. In addition, the AC power supply 17 includes a resistor 2o, a capacitor 21, and a diode 2.
This serves as a constant voltage DC power source for the control circuit described immediately after No. 2. 23 is a ring counter with a preset function connected in parallel to the capacitor 21, one end 23a is connected to one end of the capacitor 21, and the other end 1423b is connected to the capacitor 21.
It is connected to the other end and kept at ground potential. 24 is a switch that is opened and closed by the operation of the operating means 4, and is connected to one end of the capacitor 21 and the ring counter 2 with a preset function.
It is connected between the first input terminals 23c of No. 3. 25 is a resistor connected between the second input terminal 23d and the third input terminal 23e of the preset counter 23, and 26 is connected to the third input terminal 23e of the ring counter with preset function 23 and the other end of the capacitor 21. The value of the resistor 26 and the capacitor 26 determines the time constant of the clock pulse for switching the output of the ring counter 23 with a preset function. 23f, 23g, 23h, and 23i are the first output terminals of the ring counter 23 with a preset function, respectively.

They are a second output terminal, a third output terminal, and a fourth output terminal, and each of these output terminals 23f, 23g, 23h, and 23i is connected to a collector of an n light-emitting display element, for example, a light-emitting diode 29. In addition, the circuit diagram is 4 as an example.
light emitting display elements 27a, 27b.

27C and 27d constitute a set temperature display device.

One end of the temperature sensing element 2 is connected to one end of the capacitor 21, and the other end is connected to the inverting input terminal 5a of the comparator 5, and is also connected to the second output terminal 23q of the ring counter with preset function 23 via the resistor 30. In addition, the third output terminal 2 of the ring counter 23 with a preset function is connected via the resistor 31.
sh, and is further connected to the fourth output terminal 23i of the third output terminal 23 of the ring counter 23 with a preset function via a resistor 32.

33 and 34 are resistors connected in series, and this series circuit is connected in parallel to the capacitor 21.

The connection point between the resistor 33 and the resistor 34 is read directly to the non-inverting input terminal 5b of the comparator 6. 36 is relay coil 1
9, and this series circuit is connected in parallel to a capacitor 21. The output of the comparator 6 is input through the resistor 36 to the base and bottom poles of the transistor 36, and when the output of the comparator 5 is at H level, it is driven to flow current through the relay coil 19, and the relay contact 18
Close. 37 is a diode connected in parallel to the relay coil 19.

38 is the base of the transistor 290 and the output 8 of the oscillator 8.
This is a resistor connected in series with a.

A thyristor 39 has an anode connected to the base of the transistor 29 through a resistor 38. 40 is a resistor connected between the gate and cathode of the thyristor 39. 4f is a diode, 42 is a resistor, and 43 is a capacitor, which are connected in series, with one end connected to the collector of the transistor 35 and the other end connected to the gate of the thyristor 39. 44 is a transistor, the collector of which is connected to the anode of the thyristor 39.

45 is a resistor connected between the base of the transistor 44 and one end of the switch 24.

Next, the operation of the above circuit configuration will be explained.

First, the operation of the ring counter with preset function 23 will be explained based on FIG. 4. 46 is a ring counter, and when a voltage is applied to the terminal 23a, it is preset by the preset circuit 47 and drives the first output circuit 46a. , the output of the first output terminal 23f is set to L level.

Note that at this time, the second output circuit 46b and the third output circuit 46
c and the fourth output circuit 46d all have an open collector type configuration, and the respective outputs of the third output terminal 23q1, the third output terminal 23h, and the fourth output terminal 23i are all at H level. Next, when the switch 24 is closed and the input of the first input terminal 23c is set to H level, the second human power terminal 23d1
A resistor 26 connected to the third input terminal 23θ. Oscillator circuit 48 according to a time constant determined by the value of capacitor 26
oscillates and outputs a clock pulse. When this clock pulse is input to the ring counter 46, the second output circuit 46b is driven, and only the output of the n1 second output terminal 23g becomes L level, and the output of the other output terminals 2.3f and 23h.

The output of 23i becomes H level. When the next clock pulse is further input to the ring counter 46, the third output circuit 48c is driven, and only the output of the third output terminal 23h is low.
level. The next clock pulse is ring counter 4.
6, the fourth output circuit 46d is driven and only the output of the fourth output terminal 23i becomes L level. Furthermore, when the next clock pulse is input to the ring counter 46, the first output circuit 46a is driven, and only the output of the first output terminal 23f becomes L level. I am equally horrified. The main signal waveform of this ring counter 23 with preset function is
As shown in the figure. Next, the operation of the circuit configuration shown in FIG. 3 will be explained.

First, when the AC power supply 17 is connected, the output of the first output terminal 23f of the ring counter with preset function 23 becomes L level, and a current flows to the first light emitting display element 27a, causing it to light up. Since the outputs of the second output terminal 23q, the third output terminal 23h1, and the fourth output terminal 23i are at H level, the potential at the connection point between the temperature sensing element 2 and the resistor 30 is high, and therefore the comparator 6
The input to the inverting input terminal 5a is higher than the input to the non-inverting input terminal 6b, the output of the comparator 6 becomes L level, the transistor 35 is not driven, and no current flows through the relay coil 19, so the relay contact 18 is opened. , the heater 7 is not energized. Therefore, the lighting of the first light-emitting display element 27a indicates the "off" state in which the heater is not energized.

Next, when the operating means 4 is operated to close the switch 24,
Only the output of the second output terminal 23g becomes L level, and the second light emitting display element 27b lights up. Also, the second output terminal 23q
Since the output of is at L level, resistor 3o and altitude detection element 2
The potential at the connection point decreases, and the inverting input terminal 5a of the comparator 5
The input of the comparator 5 becomes lower than the input of the non-inverting input terminal 6b, and the output of the comparator 5 becomes H level. Therefore transistor 35
is driven, current flows through the relay coil 19, and the relay contact 18 closes, so that the heater 7 is energized and the base part 1
temperature increases.

This rise in temperature of the base portion 1 causes the resistance value of the temperature sensing element 2 to decrease, and when the input levels of the inverting input terminal 6a and the non-inverting input terminal 5b of the comparator 6 are reversed, the output of the comparator 5 is inverted. The voltage becomes L level, and power supply to Hill Turf is stopped. As a result, when the resistance value of the temperature sensing element 2 becomes high, the heater 7 is energized again. By repeating such operations, the temperature of the base portion 1 is maintained at the first predetermined temperature T1. That is, when the second issue display element 27b lights up, it means that the set temperature has been set to the first predetermined temperature T1.

Resistance value of temperature sensing element 2 at this time RTHMR33・I'
t30 is determined by the following formula. RTH to R34 and R3
0t R331R34 is n resistance 30, 33°34 respectively
shows each resistance value. Next, when the operating means 4 is operated to close the switch 24, only the output of the third output terminal 23h becomes L.
level, the third light-emitting display element 27c lights up, and the temperature of the base portion 1 is maintained at the second predetermined temperature T2.

That is, when the third light-emitting display element 27c lights up, it means that the set temperature has been set to the second predetermined temperature T2. The resistance value "IH2" of the temperature sensing element 2 at this time is determined by the following formula: RTH2" R34 Note that Rsl is the resistance value of the resistor 31. Further, when the switch 24 is closed, only the output of the fourth output terminal 23i becomes L level, the fourth light emitting display element 27d lights up, and the set temperature is changed to the third predetermined temperature T.
This is what was done in 3.

The resistance value RTH3 of the temperature sensing element at this time is expressed by the following formula: R33
-R32 determined. RTH3" R34 Note that R32 is the resistance value of the resistor 32. As described above, the set temperature is sequentially switched by operating the operating means 4, but the relationship between each predetermined temperature T1, T2, T3 is resistance 30, 31
．． 32 each resistance value R3o.

Since it is determined by the relationship of RH, by setting R3゜1932〉R31〉R32, the base surface 10 temperature is sequentially switched from a low temperature to a high temperature. Next, we will discuss appropriate temperature notification. Initially, when the desired temperature is set by closing the switch 24, the resistor 45
A current flows through the base of the transistor 44, and the collector of the transistor 44 becomes L level. Then, the anode of the thyristor 39 also becomes L level, and if the thyristor 39 is latched, the latch will be released. In other words, when the switch 24 is closed to set the temperature, the thyristor 39 is unlatched, and the light emission is displayed at a period determined by the oscillator 8 (in this embodiment, it is an astable multivibrator made of transistors). Element 8 blinks. After setting the temperature, when the temperature of base surface 1 reaches the set temperature, the output level of the comparator changes from H level to L level, and diode 4
1. Differential circuit 10 consisting of a resistor 42 and a capacitor 43
A trigger pulse for latching the thyristor 39 is generated at the output of the thyristor 39. Until thyristor 39 latches,
The light emitting display element 27 is repeatedly blinked at a certain period by the oscillator 8, but when the thyristor 39 latches, the output of the oscillator 8 is combined with the latch signal, so the blinking cycle of the light emitting display element 27 changes. However, in this embodiment, the lamp changes from blinking to lighting to notify that the temperature has reached the appropriate temperature. Next, when the temperature setting is changed by closing the switch 24, the thyristor 39 is unlatched as described above, and the light emitting display element 27 changes from lighting to blinking.

(The relationship between the temperature of the base part 1 and the latch of the thyristor 39 is shown in FIG. 6.) Therefore, by changing the blinking cycle of the display element 2a before reaching the appropriate temperature and after reaching the a section,
Whether or not the temperature of the base part 1 is appropriate can be checked at a glance at any time.

In this embodiment, the appropriate temperature notification is performed by changing the light emitting display element from flashing to lighting, but there is no harm in reporting the appropriate temperature by changing from lighting to flashing or by changing the flashing cycle. . Further, as shown in FIG.
By connecting the resistors, the light-emitting display element 27 can be lit in bright and dark modes instead of blinking.

As is clear from the above description, the present invention allows you to accurately obtain the desired set temperature just by operating the operating means, and the temperature control accuracy is high, so you can iron with peace of mind and the set temperature is displayed on the display. Since the display is displayed automatically, it is easier to distinguish at a glance compared to the conventional bimetal type.Furthermore, if the power cord is connected, one of the display elements is always lit, so there is no need to forget to turn off the power. It has the effect of serving as a visual notification. After setting the temperature further,
The light-emitting display element repeats flashing at a certain period until the temperature reaches the appropriate temperature, and after the water reaches the temperature, the flashing period changes, so it is possible to indicate whether the temperature is suitable or not by changing the flashing period. Compared to the conventional lighting display using lamps attached to both ends of the heater, there is no need to waste time watching the operation of the lamp from turning on to turning off or from turning off to turning on. This has the effect of instantly determining whether the temperature is appropriate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing the electric circuit of an iron showing an embodiment of the present invention, FIG. 2 is a partially cutaway side view of the iron, FIG. 3 is an electric circuit diagram of the iron, and FIG. The figure is a block diagram of the circuit of the ring counter with preseller function in the same electric circuit, Figure 6 is the same preset; signal waveform diagram of each main part of the ring counter with multifunction function, and Figure 6 is the latch circuit section and base of the same iron. A characteristic diagram showing the relationship with surface temperature, and FIG. 7 is an electric circuit diagram of an iron showing another embodiment of the present invention. 1...Base, 2...Temperature detection element, 3
...output switching circuit, 4...operating means,
5... Comparator, 6... Power control element, 7...
・・・・Hi～・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
Latch circuit, 10... Differential circuit, 11...
-Latch release circuit, 27a. 27b, 27c, 27d... Light emitting display element, 4
7...Preset circuit, 48...Oscillation circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 Figure 5 Figure 6 39 °N FF

Claims (1)

[Claims] an operating device that arbitrarily sets the temperature of the base surface; a display device that displays the set temperature selected by the operating device;
A temperature detection element that detects the temperature of the base surface, a comparator that compares the output of this temperature detection element with the temperature set by the operating device, and a power control that controls energization to the shift heater based on the output of this comparator. an oscillator for blinking the display device, a differentiating circuit connected to the output of the comparator, a latch circuit driven by the differentiating circuit to change the oscillation period of the oscillator, and interlocked with the operation of the operating means. and a latch release circuit for releasing the latched state of the latch circuit, and when the base surface reaches a set temperature, the oscillation period is changed by the output of the latch circuit to change the blinking period of the display device. The iron will display when the temperature of the base surface has reached the set temperature.