JPS58112599A - Electronic control type 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] This invention relates to an electronically controlled iron.

Base surface (hanging surface) O1I in conventional electric iron
In most cases, A degree control uses a bimetal, and the temperature is varied by the curved displacement dimension of the bimetal.

However, although this bimetal system is simple in terms of structure, it has the following drawbacks in terms of temperature control. That is, U) The temperature difference (temperature waveform) between the ON operation and the OFF operation is 11 times larger than the set temperature.

(2) There is a limit to the bimetal sensing speed of the base temperature)%
There is a temperature difference between the initial stage after input and the time of stabilization (over V neat).

(3) Temperature setting in a bimetal type is generally done by directly rotating an operating knob, etc. The intervening parts connected to the Imetal are replaced with vertical movement by a cam plate, and the temperature is set by the amount of displacement. However, because it is made up of many stacked parts, it is easy for discrepancies to occur, and it takes a lot of time for producers to properly adjust them.

In particular, items (1) and (2) above are related to the basic performance of the iron, so materials that are sensitive to temperature, such as synthetic fibers, require sufficient management as they may damage the fibers. Ta.

Therefore, an object of the present invention is to provide an electronically controlled iron that can reduce the width of temperature change in overheating and steady state, and can also reduce temperature detection errors.

An embodiment of this invention is shown in FIGS. 1 to 12. That is, 1 is an iron base, and is provided with a lid 3 and a heater 4 forming a vaporizing chamber 2 on its upper surface, and also has a groove G extending over the outer wall surface of the rear outer wall surface of the stapler 4 of the vaporizing chamber 2, which will be described later. A thermistor guide 6 having a built-in thermistor (temperature sensing element) 5 is installed in the groove G, and the groove GK has a lead wire 7 connected from the thermistor 5 to a control board 11 to be described later. A notch H is formed to hold the. 8 is a cover provided to cover the base 1; 9 is a heat shield plate provided on the cover 8; IO is a handle provided on the heat shield plate 9;
A power transformer, a power control device, an IC, and a range meter are installed in the space formed between the handle 10 and the heat shield plate 9. A control board 11 mounted with resistors, diodes, light emitting elements, and other electronic components is installed in a heat-insulating manner. 2 is a rear lid of the handle 10, 13 is a water tank provided at the front of the handle 10, has a button 14 for switching between steam and dry at the top, and a button 14 for switching between steam and dry at the bottom; It is equipped with a supply opening/closing nozzle 1V15, and is controlled by moving the operating stick 16 up and down. Further, the water tank 13#'i can be removed by operating a lock knob 17 provided near the grip portion of the handle 10.

18 is the lead #! to the control board 11. 19 is an optical switch board, and is equipped with a switch device 21 whose head 20 is exposed from the handle 10. 22 is the power cord, 2
3 is a lead wire of the heater.

Figure 11 shows the temperature control circuit of this electronically controlled iron. The heater 4 to which is applied is controlled by opening/closing a normally open contact rao of a relay Ry, and this relay Ry is controlled by a comparator 24.

The voltage of the AC power source E is rectified by a diode 25. resistance 26
The output switching circuit 28, the comparator 24 and the relay Ry
is supplied to the series circuit of the coil and the drive transistor Q'. The output switching circuit 28 is composed of a ring counter with a preset function, and each output terminal has an oven collector type inverted output diagram w! r (not shown) is connected, and its output terminal a
. A temperature display light emitting diode LED, ~LED4 is connected to -a3 via a current limiting resistor R7, and the output terminal a□~
tr, temperature setting resistors R4 to R via thermistor 5.
6 is connected. Therefore, this output switching circuit 28
When a DC voltage is applied, the first output terminal a (according to the preset function). When only the light goes to L level, the light emitting diode LED lights up. Next, when the switch 21 is pressed, the output is shifted to the second output terminal 1□ by a clock pulse determined by the time constant of the external resistor R and the capacitor C++, and only this becomes the L level, and the light emitting diode LED
, lights up, a current flows through the thermistor 5 and the resistor R4, and a potential based on the resistance values of both appears at the connection point P. Similarly, when the switch device 21 is repeatedly turned on, the light emitting diode LED 4 is turned on and the resistor R is energized, and then the light emitting diode LED 4 is turned on.
．． The switch is switched to the resistor R6, but when the switch device 21 is further turned on, the switch is switched to the original light emitting diode LED. The comparator 24 compares the reference voltage set by the resistors R2 and R3 with the potential at the connection point P between the thermistor 5 and the resistors R4 to R6, and when the potential at the connection point P is higher than the reference voltage, the comparator 24 outputs The end is L level, and the opposite is H level.
At this H level, the transistor Q
A current is supplied to the base of , turning on transistor Q and energizing the coil of relay . Do is relay Ry
This is a surge absorption diode. Therefore, when the power cord 22 is plugged into an outlet, the light emitting diode LED
The heater 4 is off because the output terminals a to a3 are at H level, but when the switch device 21 is turned on once, the light emitting diode LED lights up and current flows through the thermistor 5 and resistor R. flows and the potential at the connection point P becomes lower than the reference voltage, so the heater 4 is turned on. As the temperature rises due to heat generation in the heater 40, the resistance value of the thermistor 5 decreases, and when the potential at the connection point P exceeds the reference voltage, the heater 4 is turned off, the temperature decreases, and the potential at the connection point P reaches the reference voltage. When it descends, the heater turns on and this process is repeated. By operating the switch device 21, the resistor R5e Ra
When K is switched, the operation is the same except that the stable state temperature, that is, the set temperature is different.

Now, the mounting position of the thermistor that detects the temperature of the base l has a large margin because there is no need to consider space conditions when installing it like a bimetal, but it is not possible to install it anywhere, especially when using a steam iron. Possible locations on the base 1 that require positioning include locations A-D and X (including symmetrical locations with respect to the center line), as shown in FIG. When considered individually, when position AK sustainer 5 is located, position C.

It is only in close proximity to the outer wall surface 1 of the vaporization chamber that connects the two, and when steam is generated, heat of vaporization is taken away from the vicinity of the vaporization chamber, so the temperature naturally falls. Therefore, the thermistor 5 immediately detects the temperature drop and the heater 4 is energized, and if the drip nozzle 15 is continuously opened, the current is continuously energized in the same way. Therefore, in the continuous energization state, the vaporization chamber 2
The heater section 4m located inside is cooled, but the heater section 4b outside the vaporization chamber 2 is continuously heated, and the temperature at the rear of the base 1 continues to rise, reaching a temperature higher than the initially selected temperature during drying. This phenomenon not only damages the fibers, but also increases side radiation heat to the control board 11, which affects the reliability of electronic components. Furthermore, if the thermistor 5 is located at location C, it will be too far away from the vaporization chamber 2 and will not be able to directly sense the heat from the heater 4, turning off the heater circuit regardless of cooling inside the vaporization chamber 2. Therefore, the balance between the supply of vaporization heat and the supply of water in the vaporization chamber 2 will be disrupted. Therefore, the next time the heater circuit was turned on, a large amount of water was vaporized at once], and the steam jets became stronger.
This is not desirable in terms of quality since water leaks from the steam outlet provided in a position communicating with the vaporization chamber 2 along with the force of the squirt. Furthermore, thermistor 5
If it is located at location X, the response speed will be significantly delayed because it will be separated from the vaporization chamber 2 and the heater 4, and this will be accompanied by adverse phenomena in the vaporization chamber 2 and the heater 4, respectively. Therefore, the locations A, C, and X are not appropriate.

On the other hand, when the thermistor 5 is installed at the location BK of the base 1, the thermistor 5 is attached to the outer wall surface 1 of the vaporization chamber 2 connecting the position 40 port.
．． Because it is close to the outside g face of the vaporization chamber 2 connecting the position, opening, and 8, and the outside wall surface of the heater, it quickly senses the temperature rise after the input is turned on during drying, and sends a signal to the control circuit. Since the controller is turned off, no extra power is provided. Further, when the temperature of the thermistor 5 falls, the resistance value decreases and the control circuit is automatically turned on again. This operation causes the desired fiber temperature KW14. It can be matched without any difference. Furthermore, since it is close to the vaporization chamber 2, when using steam, it can quickly sense the cooling of the vaporization chamber 2. Further, when the continuous energization continues and the temperature at the rear of the base 1 gradually rises, the control circuit is turned off by sensing the temperature at the rear of the base 1 rather than the temperature at the vaporization chamber 2. In other words, this location B is an ideal location where the temperature of the vaporization chamber 2 and the rear temperature of the base 1 can be controlled while maintaining a balance, and the temperature can be controlled well.

Since the location is close to the outer wall surface 1 of the vaporization chamber and the outer wall surface of the heater connecting the position 40, it has the same effect as the location B.

Further, location E in the vaporization chamber having a different shape shown in FIG. 10 also has the same effect as location B because it is close to the vaporization chamber outer wall surface (■) and the heater outer wall surface (■) that connect locations (a) and (e).

In this way, as explained in FIG. A recess) G and a notch H for positioning the lead wire 7 are provided, and the thermistor guide 6 is fixed to the groove G by the mounting member 29 as shown in FIG. As a result, when the thermistor 5 is installed in a position close to the outer wall of the vaporization chamber and the outer wall of the heater, the temperature performance can be improved, and the groove in the base is used to position and fix the lead wire 7 of the thermistor 5. Since a notch H is provided in G to guide the structure, it also prevents mechanical force during assembly.] Thermistor 5 is sensitive to temperature and has low strength against external forces.
It has the advantage that it can be stored in an appropriate position.

FIG. 12 shows the temperature change of the base 1 with respect to time. The solid line shows this example, and the broken line shows the case where bimetal is used. As is clear from this comparison, the temperature range t from the initial power-on to the stable state is also different from the temperature s in the stable state.
t2 is also smaller in the example.

As described above, the electronically controlled iron of the present invention has the thermostat installed near the temperature on the base and the vaporizing chamber, so it is possible to detect the maximum base temperature, and it is possible to detect the maximum temperature of the base. Compared to the equation, the temperature range in the stable condition and the pannier 1 can be reduced, and the KN difference and variation can be reduced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a perspective view of the base, Fig. 3 is a perspective view of the thermistor, and Fig. 4 is a perspective view of the thermistor.
The figure is a perspective view of the thermistor guide, and Figure 5 is its plan view.
Figure 6 is a front view, Figure 7 is a perspective view of the thermistor guide with a built-in thermistor, Figure 8 is a sectional view of the thermistor guide attached to the base, and Figures 9 and 10 are of the base showing the thermistor installation location. Plan view, Figure 11 is temperature control circuit diagram,
FIG. 12 is a time-temperature relationship diagram. 1... Base, 2... Vaporization chamber, 4... Heater, 5
...Thermistor, 6...Thermistor guide, A-E
, X... Location, G... Groove, 29... Mounting member No. 9
Figure 10

Claims (2)

[Claims] (1) Heating base and heater installed on this base
and an electronically controlled iron comprising: a vaporizing chamber formed in the base; and a thermistor installed close to both the heater of the base and the vaporizing chamber to detect the temperature of the base. (2) The T-mister mounting portion of the base has a recess for mounting a thermistor guide that protects the thermistor, and a notch for holding the thermistor lead wire.Claim a II! The electronically controlled iron described in (1).