JPS58112598A - 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 #JVi electronically controlled iron.

Conventional electric irons use a bimetal to control the temperature of the base surface (hanging In), and in most cases the temperature is varied by the displacement dimension of the one surface. However, although this bimetal system is simple in terms of structure, it has the following drawbacks in terms of temperature control. Namely.

(1) The temperature difference (temperature waveform) between on and off operation is large relative to 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 (oversheet).

(3) Temperature setting in a bimetal type is generally done by directly rotating the operating knob, etc., and replacing the intervening parts connected to the bimetal with a screw or a cam plate that moves up and down.
The temperature was set based on the amount of displacement, but since it was made up of many stacked parts, it was easy for errors to occur, making it difficult for producers to adjust the displacement.

In particular, since (1) and (2) above relate to the basic performance of irons, materials that are sensitive to temperature, such as synthetic fibers, may damage the fibers, so sufficient management is required.

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

A first embodiment of the invention is shown in FIGS. 1 to 12. That is, l is an iron base.

A lid 3 and a heater 4 forming a vaporization chamber 2 are provided on the upper surface thereof, and a built-up step F having a groove G is provided across the rear outer wall surface of the vaporization chamber 2 and the outer wall surface of the heater 4, which will be described later. A thermistor guide 6 with a built-in thermistor (temperature sensing element) 5 is mounted inside the G, and *1 GK forms a notch H for holding a lead wire 7 connected from the thermistor 5 to a control board 11, which will be described later. are doing. 8 is a cover provided to cover the base l, 9I/
i A heat shield plate provided on the cover 8, 10 is a heat shield plate 9 plate 9
A power transformer is installed in the space formed between the

A control board 11 on which a power control device, IC, transistors, resistors, diodes, light emitting elements, and other electronic components are mounted is adiabatically attached.

12e- is a lid body at the rear of the handle 10, and 13 is a water tank provided at the front of the handle 10, with steam at the top.

It has a dry switching button 14, and is provided with an opening/closing nozzle 15 for supplying water to the vaporizing chamber 2 at the bottom, which is controlled by the upper and lower positions of an operating rod 16. In addition, the water tank 13 has a handle 1.
It can be removed by operating a lock knob 17 provided near the grip 9 of the 0. It is a switch board connected to an 18Fi control board 11 with a lead @ 19, and is equipped with a switch device 21 having one head 20 emitted from a handle 10.

22 Fi power cord, 23 is the lead wire of the heater.

Figure 11 shows the temperature control circuit of this electronically controlled iron. The heater 4 to which R is applied is controlled by the opening and closing of the normally open contact r of the relay RF, and is controlled by the relay Ryti comparator 24.

The AC power source E. The voltage of rectifier diode 25. resistance 2
6 and a smoothing capacitor 27, and this voltage is converted to a DC voltage by an output switching circuit 28.6 and a smoothing capacitor 27. Comparator 24 and relay R
It is supplied to the series circuit of Y coil and drive transistor Q.

The output switching circuit 28 is composed of a ring counter with a preset function, and an open collector type inverting output circuit (not shown) is connected to each output terminal. - Light emitting diode LED for temperature display via current limiting resistor R9
, ~LED, are connected, and temperature setting resistors R4-R6 are connected to the output terminals 80-a3 via thermistor 5. Therefore, when a DC voltage is applied to this output switching circuit 28#i.

The first output terminal a by the pre-sent function. only becomes L level, and one light emitting diode LED□ lights up.

Next, when the switch 21 is pressed, the output is shifted to the second output terminal A by the time constant of the external resistor R and the capacitor C0, and the output is shifted to the second output terminal A, and only this becomes L level and one light is emitted. When the diode LED 2 lights up, current flows through the thermistor 5 and the resistor R, and a potential based on the resistance values of both appears at the connection point P. Similarly, when the switch device 21 g) is repeatedly turned on, the light emitting diode LED 3 turns on and the resistor R5 is energized, and then the light emitting diode LED, , and the resistor R6 are switched on. When turned on, it switches to the original light emitting diode LEtl. Comparator 24
compares the reference voltage set by resistors R2 and R3 with the potential at the connection point P between the thermistor 5 and resistors R6 to R6, and when the potential at the connection point P is higher than the reference voltage, the output end of the comparator 24 goes to L level. , when it is the opposite, it becomes H level, and at this H level, current is supplied to the base of transistor Q via the base resistor, transistor Q is turned on, and relay R is turned on.
Coil F is energized. D. is a surge absorption diode of the coil of relay R)I.

Therefore, when the power cord 22 is plugged into an outlet, the light emitting diode LED lights up due to the pre-sent of the output switching circuit 28, and the heater 4 is off due to the output terminal a~a3FiH level, but the switch device 21 is turned on.
When you turn it on once, 1 light emitting diode LED 2 lights up,
Current flows through the thermistor 5 and resistor R4, and the connection point P
Since the electric potential becomes lower than the reference voltage, the heater 4 is turned on. As the temperature rises due to the heat generated by the heater 4, the resistance value of the thermistor 5 decreases, and when the potential of the connection point P exceeds the reference voltage, the heater 4 is turned off, and the temperature drops and the resistance value of the thermistor 5 decreases.
When the potential of the heater 4 falls below the reference voltage, the heater 4 is turned on, and this process is repeated thereafter. When the switch device 21 is operated to switch to the resistors R, , R, the operation is the same except that the stable state temperature, that is, the set temperature is different.

Now, the position of the thermistor that detects the temperature of the base 1 is like a bimetal, so there is no need to consider space conditions when installing it, so there is a lot of room for installation, but it does not work everywhere, so be careful especially when using a steam iron. However, as a possible location on base 1,
Like the 9th E.

Locations A-D, X (including symmetrical positions with respect to center IIL)
Considering each individual, if the thermistor 5 is located at location A, it will be close only to the outer wall surface of the vaporization chamber connecting positions 1 and 2, and when steam is generated, the heat of vaporization will be taken away from the vicinity of the vaporization chamber. Naturally, the temperature will drop. Therefore, the thermistor 5 immediately detects the temperature drop, energizes the heater 4, and continuously opens the drip nozzle 15.

During that time, electricity is continuously applied in the same way. Therefore, in the continuous energization state, the heater 1 located in the vaporizer 1ii12
14m is cooled, but the heater section 4b outside the vaporizer 112 is continuously heated, and the temperature at the rear of the base 1, on the contrary, continues to rise and reaches a temperature higher than the temperature initially selected during the dry period. This phenomenon not only damages the fibers, but also increases the radiant heat to the control board 11, which affects the reliability of electronic components. In addition, if the location CK sarnsta 5 is located too far away from the vaporization chamber 2, it will directly sense the heat from the heater 4, and the vaporization chamber will turn off the heater circuit regardless of the cooling inside the vaporization chamber 2. 2 means that the balance between the supply of heat of vaporization and the supply of water will be disrupted. Therefore, the next time the heater circuit is turned on, a large amount of water is vaporized at once, and the steam emitted becomes stronger or weaker. In addition, water may leak from the steam outlet provided in communication with the vaporization chamber 2 as well as the outlet, which is unfavorable in terms of quality. Furthermore, if the thermistor 5 is located at location X, the response speed will be significantly delayed since it will be separated from the vaporization chamber 2 and heater 4, and this will be accompanied by adverse phenomena in the vaporization chamber 2 and heater 4, respectively. Therefore, the locations A, C,
X is inappropriate.

On the other hand, if thermistor 5 is installed at location B of base 1,
The thermistor 5 is located on the outer wall surface of the vaporization chamber 2 connecting the two ports.
Since it is close to the outer wall surface of the vaporization chamber 2 connecting the position 1 opening and the outer wall surface of the heater 2, it quickly senses the temperature rise after the input is turned on during dry conditions and sends a signal to the control circuit to activate the power control device. No extra power is supplied to turn it off. Furthermore, when the temperature of the thermistor 5 falls, the resistance value decreases and the control circuit is automatically turned on again. By repeating this operation, the width of the temperature change becomes smaller and smaller. Furthermore, the temperature difference between the initial stage and the stable stage after inputting is extremely small, and the desired fiber temperature can be adjusted without error. Furthermore, in the case of using rounded steam that is also close to the vaporization chamber 2, cooling of the vaporization chamber 2 is quickly sensed. Furthermore, if the continuous energization continues and the temperature at the rear of the base 1 gradually rises, the temperature at the rear of the base 1 will be sensed rather than the temperature in the vaporizing chamber 2, and the control circuit will be turned off.

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 of the vaporizing chamber (2) and the outer wall surface of the heater (2), which connect locations A and A, it has the same effect as the location B.

Location E4 in the vaporization chamber with a different shape shown in Figure 110. It has the same effect as location B because it is close to the vaporization chamber outer wall surface ■ and the heater outer wall surface ■ which connect locations A and E.

Next, the mounting structure of the circulator 5 will be explained. That is, the second
As explained in the figure, a groove 1sF is provided, and a groove (recess) G and a notch H for positioning the lead 1 [7] are provided for positioning the thermistor guide 6 containing the thermistor 5, and the thermistor guide 6 is It is attached in close contact with the base groove G. In other words, the base groove G
If the K is not in close contact and is defeated in a floating state, there will be a large difference between the temperature after the input is input and the temperature when it is stable as explained above, and the temperature at the rear of the base will rise abnormally while using steam, and water may leak. This is because it leads to problems such as Generally, the thermistor 5 is covered with insulating glass, but applying direct stress to the thermistor during installation will result in poor insulation due to damage, and it is also difficult to determine whether the thermistor is good or bad after assembly. There are products on the market that are made of silicone rubber, but in this case, the silicone rubber acts as a heat absorber, so it is not suitable for items that are sensitive to heat, such as irons. Therefore, the thermistor guide 6 of this embodiment has a through hole 6a that is covered with glass and is in close contact with the outer diameter of 5 mK of the companion thermistor 5, and the through hole 6s
The length 6b of the thermistor 5 has a sufficient length compared to the length 5b of the thermistor 5, and a wide mounting portion 6c is provided at the lower part of the through hole 6 so that no stress is applied to the heat of the through hole 6.

Press fit the base groove GK attachment part 6c which has a press-contact dimension relationship to this attachment part 6c.
It is fixed by crimping. Due to the purpose of the Mayu thermistor guide 6, it is preferable that the container be made of a metal material such as copper, alonicum, or brass, which has good thermal conductivity. With this configuration, the base groove G
By geometrically dividing the mounting portion 6c that is pressed into contact with the thermistor 5 and the through hole 6m that houses the thermistor 5, the thermistor guide 6 and the base 1 can be firmly pressed together without directly applying stress to the thermistor 5. If the 9vk through hole 6aKt-mister 5 is inserted by pressure contact, the thermistor 5 will not be damaged due to the installation K, resulting in a highly reliable installation method, and good thermal counterfeiting performance can be achieved.

FIG. 12 shows the temperature change of the base l with respect to time, where 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 from the initial power-on to the stable state is t.

The temperature width t2 in the stable state is also smaller in the example.

A second embodiment of the invention is shown in FIGS. 13 to 15, namely, this electronically controlled iron.

The star guide 6' is formed into a cylindrical body with different diameters, and a tight through insertion hole 6a' for the star 5 is formed in the radial direction on the small diameter side, and the large diameter part is used as a mounting part 6c'. Also, the groove G of the base 1
゛ is a circular groove into which the mounting portion 6c' can be press-fitted, and the edge 1
’ is fixed by caulking it inward.

This thermistor guide 6' has the advantage of good parts machinability.

As described above, the electronically controlled iron of the present invention has a groove formed in the base, and a thermistor guide with a built-in thermistor is attached to the groove in close contact with pressure. It can be transmitted to the thermistor, and compared to the bimetal type, it has the effect of reducing the range of temperature changes in the overshade and stable state, as well as reducing temperature detection errors.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of the first embodiment of the present invention, a perspective view of the second @d base, and FIG. 3 is a perspective view of the thermistor.
Figure 4 is a perspective view of the thermistor guide, Figure #I5 is its top view, Figure 6 is its front view, Figure 7 is a perspective view of the thermistor guide with a built-in thermistor, and Figure 8 is its base mounted state. 11 is a temperature control circuit diagram, FIG. 12 is a time-temperature relationship diagram, and FIG. 13 is a diagram of the second embodiment. FIG. 14 is a front view of the thermistor guide, FIG. 14 is a plan view thereof, and FIG. 15 is a sectional view of the thermistor guide when it is attached to the base. 1...Base, 5...Thermistor, 6.6'...
Thermistor guide (metal container L61+611'...Thermistor through hole, 6c, 6c'...Mounting part, G...
Groove, y, y'...edge

Claims (4)

[Claims] (1) An electronically controlled iron comprising a heating base, a metal container closely pressed into a groove formed in the base, and a thermistor built into the metal container to detect the temperature of the base. (2) The material of the metal container is aluminum or copper. Claim No. (1) selected from brass
Electronically controlled iron as described in section. (3) The thermistor is tightly inserted into the metal container, and the base attachment part of the metal container is formed at a different position from the thermistor built-in part.
The electronically controlled iron according to item 1) or item (2). (4) The metal container is fixed by inwardly deforming the upper part of the groove. Electronically controlled iron.