JPS58112588A - 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.

In most conventional electric irons, the temperature of the base surface (fi) is controlled by using a bimetal, and the temperature is varied by the curved displacement dimension of the bimetal.However, this bimetal method is simple in terms of structure. However, it has the following drawbacks in terms of temperature control.

■ Temperature difference between ON operation and OFF operation with respect to the set temperature (
temperature waveform) is large.

■ There is a limit to the bimetal sensing speed of the base temperature, and there is a temperature difference between the initial stage after input and the time when it stabilizes (overshade).

■ Temperature setting in a bimetal type is generally done by directly rotating the operating knob, etc., and the intervening member and screw nine connected to the bimetal are changed to vertical movement by a cam plate.
This was done based on the amount of displacement, but since it consists of stacking many parts, errors are likely to occur, and it takes time for producers to correct them.

In particular, the above (2) and (2) are related to the basic performance of the iron, and it was necessary to carefully manage materials that are sensitive to temperature, such as synthetic fibers, because they may damage delicate items.

Therefore, an object of the present invention is to provide an electronically controlled iron that can perform highly accurate temperature control and simplify temperature setting operations.

The electronically controlled iron of the present invention has an output switching circuit that sequentially switches the output state each time the switch is turned on and off, and detects the selected resistance and the temperature of the base based on the output state of the output switching circuit. The two outputs of the bridge circuit including the temperature sensing element are compared by the comparator 1, and the output level of this comparator is determined by KN6 to turn on and off the power control element to control the energization to the heater. By operating the display according to the output status (11KIF), the temperature of the base can be accurately controlled and the set temperature can be displayed, making the temperature setting operation easier.
L and the set temperature are displayed to make it easier for the user to understand.

An electronically controlled iron according to an embodiment of the present invention will be explained based on FIGS. 1 to 5.

FIG. 1 shows a block diagram of an electronically controlled iron. In the figure, 1 is a base portion of the iron, 2 is a temperature detection element for detecting the temperature of the base portion 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 on one side of the bridge circuit based on the output of the ring counter, and also drives the set temperature display 8 to display the set temperature. 4 is a switch that operates the output switching circuit 3, and each time it is turned on or off, the output switching circuit 3 is
Shift the output of . 5 is a comparator that compares the two outputs of the bridge circuit including the selected resistance with the output of the temperature detection element 2 and the output switching circuit 3, and drives the power control element 6 with the output to energize the sheathed heater 7. Control is performed to maintain the temperature of the base portion l at a predetermined set temperature. That is, by turning on and off the switch 4, the temperature of the base portion 1 can be maintained at an arbitrary set temperature, and the set temperature is displayed on the display 8.

FIG. 2 shows a specific electrical circuit diagram of the electronic complete iron set. In the figure, reference numeral 9 denotes an AC power source, to which a sheathed heater 7 and a 111-line circuit of normally open relay contacts 10m are connected. This relay contact 108 closes when a relay coil 10bK11 (described later) flows, and the sheathed heater 7 is energized. Also, the AC'It source 9 has a resistor 1.
A series circuit of capacitor 1 and capacitor 12 is connected. This capacitor 12 represents a constant voltage DC power source for a control circuit which will be described later. 13 is a ring counter with four preset functions connected in parallel to the capacitor 12, one end 13a
is connected to one end of the capacitor 12, and the other end 13b is connected to the other end of the capacitor 12 and maintained at ground potential. Reference numeral 4 denotes a switch which is opened and closed by operating an operating means to be described later, and is connected to one end of the capacitor 12 and a first input terminal 13C of the ring counter 13 with a preset function. 14 is a resistor connected between the second input terminal 13d and the third input terminal 1315 of the ring counter 13 with preset function, and 15 is the ring counter 13 with preset function.
This is a capacitor connected to the third input terminal 13e of the
The time constant of the clock pulse for output switching of the ring counter with preset function 13 is determined by the value of . 13f
, 13g, 13h and tat are the first output terminal and second output terminal of the ring counter 13 with preset function, respectively.
an output terminal, a third output terminal, and a fourth output terminal; each of these output terminals 13f, 13g, and 13h;

13i are light emitting display elements 161 #16b,
) Commonly connected to one end of a resistor 17 via 16C116d, and the other end of this resistor 17 is connected to one end of a capacitor 12. In the circuit diagram, as an example, a set temperature display is configured by four light emitting display elements 16a, 16b, 16C, and 16d.

The humidity sensing element 2 has one end connected to one end of the capacitor 12, the other end connected to the inverting input terminal 5a of the comparator 5, and also connected to the second output terminal 13g of the ring counter with preset function 13 via the resistor 18. Also, resistor 19t-
Via Griset Jll Capable Ring Counter 13th
The output terminal 13h is further connected to a fourth output terminal 131 of the ring counter 13 with a preset function via a resistor 20. 21 and 22 are resistors connected in series, and this series circuit is connected in parallel to the capacitor 12.

The connection point between the resistor 21 and the resistor 22 is connected to the non-inverting input terminal 5bK of the comparator 5. 23 is a transistor connected in series to the relay coil 10b, and the relay coil 10b and the II column circuit of the transistor 23 are connected in parallel to the capacitor 12. The output of the comparator ls5 is inputted to the base electrode of the transistor 230 through the resistor 24, and when the output of the comparator 'a5 is at H level, it becomes conductive and current flows through the relay coil 10b, closing the relay contact 10M. .25 is a nine diode connected in parallel to the relay coil 10b.

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

First, the operation of the ring counter 13 with preset function will be explained based on the specific block diagram shown in FIG. 2
6 is a ring counter), terminal 131 is connected to the terminal 131 shown in Fig. 4 (AR
When a voltage is applied as shown in FIG.
level. Note that at this time, the second output circuit 26b, the third
The output circuit 26C and the fourth output circuit 26d both have an open collector type configuration, and the second output terminal 1
3g.

The respective outputs of the third output terminal 13h and the fourth output terminal 131 are both at H level as shown in FIG.

Next, when the switch 4 is closed and the input of the first output terminal 13f is set to H level, the second input terminal 13d and the third
The oscillation circuit 28 oscillates according to a time constant determined by the values of the resistor 14 and capacitor 15 connected to the input terminal 13e, and outputs a lock pulse as shown in FIG. 4). This clock pulse is the ring counter 2'
6, the second output circuit 26b is driven and the second
Only the output of output terminal 13g is KL as shown in Figure 4 (Shun).
level, and the other output terminals 13f, 13tte
The output of 13i is shown in Figure 4 (C).

(El, (As shown in Fl, it becomes H level.

Furthermore, when the next clock pulse is input to the ring counter 26, only the output of the third output terminal 13h of the third output circuit 26C becomes the KL level as shown in FIG. 4 (El).

When the next clock pulse is input to the ring counter 26, the fourth output circuit 26d is driven, and the fourth output terminal 13i is
Only the output from the first output terminal 13f becomes L level as shown in FIG. Figure 4 (CI K as shown)
level. Repeat f.

Next, the operation of the circuit configuration shown in FIG. 3 will be explained.

First, when AC power R9 is connected, the output of the first output terminal 13f of the ring counter 13 with preset lII function becomes L.
level, and a K current flows through the first light emitting display element 161, lighting it up. Since the outputs of the second output terminals 13g, tjl, the third output terminal 13h, and the fourth output terminal 13I are at H level, the potential at the connection point between the temperature sensing element 2 and the resistor 18 is high, and therefore the comparator 5 is inverted. The input of the input terminal 5a is higher than the input of the non-inverting input terminal 5b, and the output of the comparator 5 becomes L level, the transistor 23 is not conductive, and no current flows to the relay coil 10b, so the relay contact 10a is opened and the sheathed heater 7 is not energized. Therefore, the lighting of the first light emitting display element 1611 is controlled by the sheathed heater 7.
The display shows the "off" status, meaning that the power is not energized.

Next, when the operating means is operated to close the switch 4,
Only the output of the second output terminal 13g becomes L level, and the second
The light emitting display element 16b lights up. In addition, the second output terminal 1
3g is at L level, the potential at the connection point between the resistor 18 and the temperature sensing element 2 decreases, and the input to the inverting input terminal 5JI of the comparator 50 is lower than the input to the non-inverting input terminal 5b. The output becomes H level. Therefore, the transistor 23 becomes conductive, current flows through the relay coil 10b, and the relay contact 10M closes, causing the sheathed heater 7 to d[ and the temperature of the pace section 1 to rise. Due to this temperature increase in the base portion 1, the resistance value of the temperature sensing element 2 decreases,
Input of inverting input terminal 5a of comparator 5 and non-inverting input terminal 5
When the level of the input of b is reversed, the output of the comparator 5 is reversed and becomes L level, and the energization to the sheathed heater 7 is stopped. As a result, when the resistance value of the temperature sensing element 2 becomes high, the sheathed heater 7 is energized again. By repeating such operations, the temperature of the base portion 1 is maintained at the first predetermined temperature T.

That is, when the second light emitting display element 16b lights up, it means that the set temperature has been set to the first predetermined temperature T. The resistance value RTH of the temperature sensing element 2 at this time is determined by the following equation.

In addition, R□8. R2□, R2, are each resistance 18,
Each resistance value of 21°22 is shown.

Next, when the operating means is operated to close the switch 4,
Only the output of the third output terminal 13h becomes L level, and the third
The light emitting display element 16C lights up and the temperature of the base portion 1 is maintained at the second predetermined temperature T2. That is, the third
The light emitting display element 16C turns on. The resistance value RTH2 of the temperature sensing element 2 at this time is determined by the following equation.

Note that R is the resistance value of the resistor 19.

Furthermore, when the switch 4 is closed, only the output of the fourth output terminal 131 becomes L level, and the fourth light emitting display element 16d
lights up, indicating that the set temperature has been set to the third predetermined temperature T3. At this time, the resistance value R and y3 of the temperature sensing element 2 are determined by the following equation.

Note that this is the resistance value of the R20ti resistor 20.

As mentioned above, the set temperature is sequentially changed by operating the operating means, and each predetermined temperature T
2 e The relationship of T3 is determined by the relationship between the resistance values R, R, and R of the resistors 18, 19.20 18 19
20, so by setting R work, > R work 9 > R20, the temperature of the base portion 1 is sequentially switched to low temperature, medium temperature, and high temperature.

Figure @5 shows a partially cutaway side view of this electronically controlled iron. In Figure 15, 1 is the base part of the iron,
2 is a temperature sensing element that is in close contact with the inner surface of the base part, 30 is a cover that handles the upper part of the base part 1, and 31 is a heat-transmitting plate that lies above and behind the cover 30 with a certain gap, and is provided on the bottom surface. The cover 30 is fixed to the cover 30 by passing the cover 30 through the boss 318 and tightening the screws 32. Reference numeral 33 denotes a handle body with an open bottom surface, and a handle body is provided at the rear opening edge to engage a locking claw 31b at the rear of the lotus heating plate 31 with nine locking holes (not shown), and to hold the handle body downward to the inner wall surface of the body. Projected boss 3a
It is fixed to the heat shield plate 31 by tightening the screws 34 through the through holes 31C of the aKa heat plate 31. 35 is a handle layer 1 that closes the rear opening of the handle body 33, and a boss 3 provided on the inner surface.
51 on the inner wall surface of the rear leg portion of the handle body 33
By tightening the K screw 36, the handle back cover 35 is fixed to the handle body 33. 37 is a handle body 33 and a heat shield plate 31
And the handle layer! The control board is placed in the space formed by the temperature control circuit and the power transformer.

Tall parts such as a power control element and a capacitor are located in the rear leg space of the handle body 33, while other short parts are mounted on the upper surface so as to be located in the body space. 38 and 39 are auxiliary insulation boards,! A heat insulating space is interposed between the expansion plate 31 and the control board 37 to form several layers of heat insulation space, and insulation is provided at corresponding positions on the mutually opposing surfaces of the connection plate 31 and the auxiliary insulation plates 38 and 39. Concave and convex fitting parts for securing space and mutual positioning 31d e 38a e 3
8b s 39a is provided, and the uppermost auxiliary insulation board 39
A projection 39b for supporting the control board 37 is provided on the upper surface of the handle body 33, and the control board 37 is held between this projection 39b and a downward step 33d provided inside the handle body 33. Reference numeral 40 denotes a switch board, which is disposed within the grip portion of the handle body 33 and fixed with a screw 41, on which the switch 4 is mounted. 42 is an operation knob for operating the switch 16;
It protrudes outward from the bottom surface of the recess 33e on the upper surface of the grip portion of the handle body 33 and is located within the recess 33e.

43t1 A water tank attached to the front part of the handle body 33. A steam/dry switching button 44 is provided at the top, and below this steam/dry switching button 44, a nozzle 45 for supplying water to the base part 1 is installed. is formed, and its opening/closing is controlled by moving the operating stick 46 up and down. Water supply nozzle 4
5 opens, the water in the water tank 43 flows into the vaporization chamber 4 of the base part 1.
7, steam is generated, and this steam is ejected from the steam hole formed in the base part 1. Further, the water tank 43 can be removed from the handle body 33 by operating a lock knob 48 provided near the grip portion of the handle body 33.

In this way, in this embodiment, the desired predetermined temperature can be easily and accurately obtained by simply turning on and off the switch 4, and the temperature control accuracy is high. Since it is automatically displayed by 8, it is easier to distinguish at a glance compared to the conventional bimetal type, and when the power cord is connected, one of the light emitting display elements 161 to 16d is always lit. Therefore, it is possible to provide a visual notification function for forgetting to turn off the power.

Another embodiment of the invention is shown in FIG. That is, this electronically controlled iron has diodes 48 to 50 added to the output of the ring counter 13 in the circuit shown in FIG.
The output of the ring counter 13 is as shown in FIG.

For example, when the output of the fourth output terminal 13i is at the L level, the third output terminal 13fi is at the L level due to the diode 50.
become the level. @3 When the output terminal 13h becomes L level, the second output terminal 13g becomes L level due to the rounding of the diode 49, and when the second output terminal 13g becomes L level, the first output terminal 13f becomes L level due to the diode 48. Become.

this! ! Grise in the example? Waveforms of various parts of the ring counter 13 with Ili (corresponding to FIG. 4) are shown in FIG. 7 (At-(Fl).

As described above, in this embodiment, the number of set temperature display elements to be lit is changed from 1 → 2 → 3 → 4 → 1, etc.

The effect of this embodiment is the same as that of the above-mentioned embodiment. In addition, in the above two embodiments, a 4-ary ring counter was used in order of off → low temperature → medium wet → high praise → off... It is also free to match the number of set temperature displays determined by .

As described above, the electronically controlled iron of the present invention has -
A base part with a built-in sensor, a temperature detection element attached to this base part to detect the temperature of this base part, a switch, an output switching circuit whose output state changes sequentially each time this switch is turned on and off, A first circuit comprising a plurality of temperature setting resistors, one of which is selected depending on the output state of the output switching circuit, and the temperature sensing element and one of the plurality of temperature setting resistors, forming a bridge circuit. a comparator that compares a second resistor and two outputs of the bridge circuit; and a power control element that controls energization to the heater based on the output of the comparator to maintain the temperature of the base portion at a set temperature. And the output state of the output switching circuit is 1! Since the device is equipped with a display device that displays a set temperature according to iK, it is possible to perform highly accurate temperature control and to simplify the temperature setting operation.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an electronically controlled iron according to an embodiment of the present invention, Fig. IJIIz is its specific circuit diagram, Fig. 3 is a specific block diagram of its main parts, and Fig. 4 (Fl is the waveform of each part). 5 is a partially cutaway m-plane diagram showing the configuration of this electronically controlled iron, FIG. 6 is a circuit diagram of another embodiment of the present invention, and FIG. 7 is a waveform diagram of each part. DESCRIPTION OF SYMBOLS 1...Base part, 2...Temperature detection element, 3...Output switching circuit, 4...Switch, 5...Comparator, 6...
... squid control element, 7... sheathed heater, 8... indicator, 18-22... resistor

Claims (1)

[Claims] a base portion with a built-in heater; a temperature detection element attached to the base portion to detect the temperature of the base portion; a switch; and an output switching circuit whose output state is sequentially switched each time the switch is turned on and off; A first circuit comprising a plurality of temperature setting resistors, one of which is selected depending on the output state of the output switching circuit, the temperature sensing element and one of the plurality of temperature setting resistors, forming a bridge circuit.
and a second resistor, a comparator that compares the two outputs of the bridge circuit, and a power control that controls energization to the heater to maintain the temperature of the base at a set temperature based on the output of the comparator. An electronically controlled iron comprising an element, a display and a device that display a set temperature according to the output state of the output switching circuit.