JPS61222493A - 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 (Field of Industrial Application) The present invention relates to an iron used in general home appliances, and more particularly to an iron that prevents forgetting to turn off the power.

P (Prior Art) Conventionally, irons for preventing this type of forgetting to turn off the power have been proposed, such as Japanese Utility Model Publication No. 59-37098 (c hereinafter referred to as A), Japanese Patent Application Laid-Open No. 59-A5700 (hereinafter referred to as B), etc. ing. That is, the key to A is that the ironing device has a detection means for detecting when the ironing operation is in operation and when the ironing operation is stopped, and a means for cutting off the current supply circuit to the heater after a certain period of time has passed after the ironing operation is stopped. In a configuration with
The detection means detects the state in which ironing is stopped.

The power to the heater is automatically cut off after a certain period of time. In the embodiment, a mercury switch is used as the detection means, and the movement of mercury accompanying the ironing operation short-circuits and opens the conductive plate, thereby detecting operation and stoppage of the ironing operation. In B, the configuration is basically similar to that in A, and the operation can be considered to be almost the same. In BvC, the detection means in A is a usage determination device. As an example of the usage determination device, a mercury switch is used as in A.

3P (Problems to be Solved by the Invention) This type of proposed iron that prevents users from forgetting to turn off the power has the following problems.

(1) Since the iron is reset to the power off state after a certain period of time has passed depending on the base temperature of the iron, it will take the same amount of time even if the base temperature is high and there is a high risk of danger as if the base temperature is low.

Unfavorable from a safety standpoint.

(2) The detection means for detecting the state in which ironing is stopped generally has directionality, and if this means has directionality, the operation will be uncertain.9 Even under normal use conditions, it will malfunction, This often causes inconvenience.

(6) Mercury sui and sochi, which use a large amount of mercury, are examples of detection means that have relatively little directionality, but these have problems in terms of pollution.

(Means for Solving the Problems) The present invention includes a base equipped with a heater, a temperature setting circuit that sets the base temperature, a temperature detection circuit and a temperature adjustment circuit that detect the base temperature and control the base temperature to the set temperature. , a self-standing leaving detection circuit that detects that the iron is in a free-standing state;
Recognizes that the iron has finished preheating, and if the iron is left in a state other than standing alone, the heater pause period tOFF
(seconds) exceeds a reference value tB (seconds) for a predetermined number of times N (times) or more consecutively, a control device having a function of turning off the power.

The configuration is such that the reference value tB (seconds) is changed for each set scale of the base temperature.

(Function) This will be explained using FIGS. 1 and 2. When the power plug is inserted into an outlet and the base temperature is set to a predetermined temperature, the iron starts to be energized, the heater 2 is turned on, and the base temperature is increased. The temperature detection element 3 follows the rise in the base temperature, and when the base temperature Ta reaches the set temperature Ts due to the function of the temperature detection circuit 4, the heater 2 is turned off in a so-called first wave OFF, and the control device 7 recognizes this. after that.

The heater continues 0N10FF, and the base temperature is maintained at a constant temperature. After the first wave is turned off, the operation is performed as follows based on the signal from the stand-alone left detection element 5.

P (1) In the stand-alone state, the timer circuit of the control device 7 is activated, and the iron is automatically turned off when a predetermined time tA (minutes) has elapsed.

(2) In a state other than being left standing alone, the heater rest period (hereinafter referred to as tOFF) during which the heater 2 is OFF is measured using the signal from the temperature detection element 3, and this tOFF (seconds) is determined as a preset reference value tB. (seconds) for a predetermined number of times N (times) or more consecutively, the control device 7 turns off the power to the iron.

(3) In the state of (2) above, when tOFF (seconds) does not exceed the reference value tB (seconds) for a predetermined number of times N1 or more, the heater 2 is turned ON10 F by the function of the temperature detection circuit.
Continue with F. Here, the heater off period tOF'F(
The difference between turning off the power (seconds) and turning off the power is that in the former, the heater 2 returns to ON when the base temperature drops below a predetermined value, but in the latter, the heater 2 remains ON only when the return operation is performed manually.
It refers to a state of lack of energy.

Further details will be explained using FIGS. 6 to 6. In Figure 3, the iron is sometimes placed in an energized oven in the state shown in (Yakauichi P). This is the state when ironing.
Leaving the device in this state is called horizontal abandonment. When left horizontally, the base is in direct contact with the floor or fabric, and is the state in which it is most necessary to stop energizing the heater 2 and reset the power to OFF. (C) is a sideways left standing condition where the stand-alone left state is turned over, 0 is a horizontally inverted left standing state which is a reverse of the horizontal left standing state, and (E) is a self-standing inverted left standing state which is a reversed state of free standing standing state. In general, irons are rarely left in any state other than (A), but if you do not notice that you have accidentally pulled the power cord, you may leave the iron in state (D). , States other than standing alone refer to various states (excluding AI) to (D), or intermediate states between these patterns.

In FIG. 4, when electricity starts to be applied to the heater 2, the base temperature changes over time as shown in the figure.

■ is the starting point, and ■ is the first wave OFFZP point. ■ is the ON point of the second wave, @ is the OFF point of the second wave
The point ■ is the ON point of the third wave. Similarly ■.

■ and ■ are ON and OFF after the nth wave, respectively.

Among these characteristics, we focused on the points ■, ■, and ■.

Figure 5 compares the state of Figure 3 (AI) and the state of (13). Here, tON is the heater energization period (seconds) and tOFF is the heater off period (seconds) as described above. In Figure 5, the mountain is in the state of , that is, ironing shows the temperature characteristics of the state. Since t ON (seconds) is dominated by the heat capacity of base 1, there is no big difference in either case (Il, (Ill, @l), tOFF (seconds) is the period during which the thermal energy stored in the base 1 is released, and it varies significantly depending on the heat dissipation conditions. This relationship is quantitatively determined in Figure 6. ℃
), which shows the relationship between the number of tOFF times (times) and tOFF (seconds) at room temperature. Here, I used a wooden stand for the floor.

A cotton cloth (tenugui) is spread on the wooden stand. 0°)
was left with the auxiliary fixed in place so as not to affect the base temperature. As can be seen from this result, tOFF (seconds) during ironing is smaller than under any condition where the iron is left unused, and there is a noticeable difference in tOFF (seconds) during ironing. For example, tOFF during the second wave is 33 (seconds) when moving with Bl, that is, ironing, but 56 (seconds) when leaving with false, that is, standing on its own.

84 (
seconds), there is a significant difference. If you focus on leaving it horizontally.

In this case, the base surface directly contacts the horizontal surface, so
tOFF changes depending on the object to be contacted. This is shown in Figure 7. FIG. 7 shows the relationship between the number of OFF cycles (times) and topp (seconds) selected as contact surfaces in addition to cotton cloth, such as newspaper, a wooden stand, and an iron plate at a base temperature of 150 (° C.) and room temperature. As a result, although there are differences in tOFFC seconds) depending on the heat conduction characteristics of the object to be touched, its value is much larger than that when ironing. Figure 8 shows the quantitative relationship between the base temperature and tOFF (seconds). Although tOFF (seconds) changes depending on the base temperature, the correlation between horizontal storage, ironing, and freestanding storage is There are many changes.

From the above, tOFF in the state where preheating is finished
If the standard value tB (seconds) of tOFF (seconds) is set in advance for each base temperature scale, and the power is automatically turned off when tOFF (seconds) exceeds this tB (seconds), it is possible to You can eliminate the unsafe mode when not ironing. Here, leaving the iron on its own is a normal way to use the iron, so tOFF (seconds) when leaving it on its own is the value t of the above standard.
It is necessary to exclude it from the scope of B (seconds). 2. In order to avoid the influence of surrounding conditions and other disturbances, the standard value t
Reliability can be improved by providing a system that turns off the power when B (seconds) is exceeded several times in a row.

To prevent forgetting to turn off the power when left standing, the standing standing detection element 5 recognizes the standing standing state.

A timer circuit is driven to automatically turn off the power after a predetermined time tA (minutes) has elapsed.

(Example) FIG. 9 shows a circuit configuration of an embodiment of the present invention.

0P In the figure, the heater 2 is a sheathed heater with a power consumption of 90017) and has a 9-circuit symbol iR1. Heater R1 is connected to power source 16 via contact S1. Contact, q, S 1 are the contacts of relay RY of temperature control circuit 8, and contact, @, S 1 is O regardless of the base temperature.
The power is turned off when it is FF, and it responds to the base temperature by turning on 0N10FF to control the energization to the heater R1, and serves to maintain the base temperature at a predetermined temperature.

F is the temperature heat. 9 is a DC power supply circuit, power supply 1
This is a circuit that rectifies 3 IDO(V) and divides it into 2 voltages. This circuit has a ground terminal and a terminal at positive potential @0. 0 is 24 (V) to operate the DC relay, and e is 5 (V) to operate all other electronic circuits. The control device 7 is an LSI chip, and in this embodiment, a CMOS one-chip microcomputer is used. VDD is the power supply terminal, Vss, CNVss is the ground terminal, REsET is the reset input terminal, X0U
T and XIN are clock input terminals, and D1 to I
')7. Fo-F3. S is a port terminal for input/output with an external circuit. Ceramic 11 for X0UT and XIN
An oscillation circuit 12 composed of a P-resonator, a resistor, etc. is connected, and a 400 KHz clock input is input.

D1 to D7 are connected to a DA conversion circuit. S is the input port terminal of the temperature detection circuit 4, and FO is the independent left detection circuit 6. Fl is an input port terminal of the temperature setting circuit 11. Further, R3 is an output port terminal of the temperature control circuit. Then, the program memory (ROM) is stored in the flowchart shown in Fig. 2, that is, the base temperature Ta and the set temperature Ts are compared, and after the first wave OFF recognition, depending on whether or not the beans are left alone, the heater is heated again after a predetermined time tA of the timer. A machine section is input that turns off each power supply after the rest period tOFF exceeds the reference value tB a predetermined number of times N or more in succession, and further changes the reference value tBi every set temperature Ts.

A negative characteristic thermistor THi is used as the temperature detection element 3, and a comparison circuit including an rci'i comparator is configured as the temperature detection circuit 4. The DA conversion circuit 10 is part of the temperature detection circuit 40 circuit configuration.

In addition to the thermistor TH, the input terminal side of IC1 has resistors R6, R7, and R8, and the output terminal side has a resistor 1 (9°1 (10). It is equipped with a resistor and a capacitor for noise removal.A photo interlitter is used for the stand-alone detection element 5.The circuit component of the photo interlitter is a light emitting element LE.
D and phototransistor Q2. R11 is LED
, and R12 is the load resistance of Q2.

The independent detection circuit of B is IC2 and the resistance R on its input side.
13, R14 and output side resistor R15, 1 (16, etc.).The temperature control circuit 8 is a rectangular tube of transistor Q1 and Ql. □Relays RYEt and Ql
(base circuit resistance) (2, R3, etc.).

Dl is a diode for absorbing back electromotive force applied to the RY coil. The R6 boat terminal of the LSI chip is the drive terminal for Ql, and when R3 is H, Ql is OFF and L
When , Ql is turned ON.

The salinity setting circuit No. 11 is connected to the F1 boat terminal when the switch S2 is ON, and an H signal is input when the switch S2 is OFF.

S2 is a self-resetting switch and turns ON when pressed with 9 hands.
If you let go of the 9th hand, it will turn OFF.

FIG. 10 shows the structure of No. 5 independent sensing element.

3P 14 is a casing in which the LED and Q2 are fully built-in, and 15 is a groove portion for guiding the obstacle 16. The obstacle 16 is a spherical object that does not allow light to pass through. The groove 15 has a hole 1 that allows light emitted by the LED to reach the phototransistor Q2.
7. And as shown in Figure 11 (al),
When left standing, the hole 17 is blocked by the obstacle 16,
Since the light from the LED cannot reach Q2, Q2 is turned off. In addition, in a state other than being left standing on its own, Figure 11 (b)
The obstacle moves within the groove 15 as shown in FIG.

Hole 17 is opened, LEIM) light reaches Q2,
Set Q2'eON. Here, the 11th
As shown in Figure (al), the groove 15 is arranged at an angle with respect to the vertical direction, but this is so that the independent left detection element can respond smoothly even to subtle changes in the left condition. .

The operation of the embodiment having the above configuration will be explained.

(1) Insert the iron's power plug into the outlet.

The LSI chip of the control device 7 is turned on, but the heater 2
The device is in a power-off state where no power is applied.

The R3 boat terminal is OFF (and Ql is OFF, contact S is
1 is OFF 4P.

(2) Set the base temperature to the set temperature.

If you press S2 a predetermined number of times or keep it pressed for a predetermined time.

Port terminals D1 to D7 are set to L one by one.

The position where the temperature finally reaches I becomes the position of the scale of the set temperature. For example, when D3 finally reaches L, the resistance of the D-A conversion circuit connected to D is 1 (D3),
The resistance value at the position of the set temperature scale is determined by the resistance value RD311 R6 of the parallel circuit of RD3 and R6. I
The voltage on the R and D filter 11R6 side, which is the voltage divided by the resistance value of RD311R6 and TH, is applied to the inverting input side of C1.

Furthermore, a reference voltage determined by R7 and R8 is input to the non-inverting input side of IC1.

(3) The heater 2 starts to be energized and enters a preheating state.

Immediately after preheating starts, the base temperature does not reach the set temperature.
The resistance value of Tl-1 is high<, and the output side of rcl is I]. For this reason, 11 signals are manually input to the S boat terminal.

15P (4) The base temperature reaches the set temperature and preheating ends.

The resistance value of TH becomes low, and the output side of IC1 becomes L. Therefore, an L signal is applied to the S port terminal, and the F
3 port terminal becomes H and Ql is OFF l.

RY operates and contact S1 turns OFF. The base temperature is maintained within a constant temperature range.

(5) Start ironing.

The TH follows changes in the base temperature, and the base temperature is maintained within a constant temperature range. During this time, tOFF (seconds) does not exceed the reference value tB (seconds), and ironing can be continued.

(6) If the iron is left standing on its own after preheating, the power will be turned off after the timer predetermined time tA (minutes). When the iron is left standing on its own after preheating, the standing standing detection element 5 detects the 11th
In the state shown in FIG. 3(a), Q2 is OFF and the output terminal side of lc2 remains at H level. Then, the H signal is still applied to the FO port terminal, and the timer circuit built into the LSI chip operates, and after tA (seconds), the FO port terminal f: becomes H.

Turn off the power. Then, the input of S2, namely F
As long as there is no input to the 1 port terminal, the heater 2 is rarely energized. Here, tA is about 10 (minutes).

(C) If the heater is left in a state other than independent, and the heater's inactive period tUI''F (seconds) exceeds the standard value TB (seconds) N (times) in a row, the power will be turned off.

If the device is left in a state other than free standing after preheating, the free standing detection element 5 will be in the state shown in Fig. 11 (bl). At this time, Q2 will be turned on, fi, and the output terminal side of IC2 will be L. Then, FD An L signal is input to the port terminal. When an L signal is input to the FD port terminal, the tOFF time is recorded in the data memory (I (AM)) of the LSI chip, and the program memo IJ ( ROM)
A comparison is made with the standard value tB set for tOFF
When (seconds)≧tB (seconds) continues for N (times) or more, the F3 boat terminal is set to H, the built-in circuit is activated, and the power is turned off.

Here, tB (seconds) is Heath temperature 150℃ terrorism 0 (seconds),
N=3 (times). Further, tB (seconds) is changed according to FIG. 8 for every 7P scale of the base temperature.

(Effect of the invention) According to the present invention, the following effects are achieved.

(1) Heater off period tOFF i standard value tB
Since the reference value tB is compared N times or more in the temperature setting circuit and the reference value tB is changed for each set temperature, unsafe modes caused by leaving the iron unattended can be reliably eliminated and a highly safe iron can be provided.

(2) Unlike conventional timer operation methods, if the device is left in a state other than standing alone, which poses a danger, the power will be turned off in a short period of time if the set temperature is high, and in a long period of time if it is not. It is possible to create a reliable and highly safe system.

(b) The stand-alone state detection element needs to respond only to the stand-alone state, and it is possible to use a directional element, and it is possible to use a device that does not cause pollution, such as a mercury switch.

2. In the present invention, tOFF mainly changes depending on the usage condition of the iron, and tON is almost constant. From page 8, we have focused on tOFF, but the heater's O
N10 FF period (tON+tOFF) (seconds)
Alternatively, even if it is taken as a change in the energization rate (tON/1OFF+tON), it is still essentially a change in tOFF and is included in the content of the present invention.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a system related to an iron according to an embodiment of the present invention, Fig. 2 is a flowchart of the same program, Fig. 3 is an explanatory diagram of various states of leaving the iron, and Fig. 4 is a base of the iron. Temperature characteristic diagram showing changes in temperature, 5th
The figures are ■ and ■ in Figure 4. Focusing on ■, an explanatory diagram showing that the temperature characteristics change depending on the conditions under which the iron is left, Figure 6 is an explanatory diagram of the relationship between tOFF (seconds) and the number of times at each position of the iron, and Figure 7 is The same explanatory diagram when various materials are brought into contact with the same iron, and FIG. 8 is a characteristic diagram showing that the tOFF (seconds) changes depending on various conditions. FIG. 9 is a circuit diagram, FIG. 10 is an explanatory diagram of the independent left detection element, and FIG.
This is a P diagram. 1...Base 2...
Heater -4...Temperature detection circuit 6...
・Self-standing neglect detection circuit 7...Control device 8...
・Temperature adjustment circuit 11...Temperature setting circuit

Claims (1)

[Claims] A base (1) equipped with a heater (2), a temperature setting circuit (11) for setting the base temperature, a temperature detection circuit (4) for detecting the base temperature and controlling it to a set temperature TS (°C), and a temperature adjustment. The circuit (8), the independent leaving circuit (6) that detects the independent leaving state of the iron, and the heater stop period tOFF (seconds) excluding the first wave OFF when the iron is in a state other than free standing after preheating. ) and a control device (7) that has a function of measuring the change in the reference value tB (seconds) and turning off the power when the change exceeds the reference value tB (seconds) for a predetermined number of times N (times) or more; (seconds) to set temperature TS (
An iron that changes temperature by ℃).