JPS62144699A - 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 the Invention The present invention relates to an iron having a function of preventing overheating accidents caused by forgetting to disconnect the power cord.

Conventional Technology Conventionally, there has been a technology in which a switch is turned on and off by the reciprocating motion of an iron during use, and the signal determines that the iron is in use, or it is determined that the iron is not in use if it is left stationary for a certain period of time without moving. Ta.

FIG. 6 shows a conventional circuit diagram. 1 is a use/non-use detection switch. When in use, the switch turns on and off, and when the microcomputer IC + is input to the input port 1, the use/non-use detection switch 1 is at a low level when it is on, and when it is off, it is at a low level. High level voltage is read. When the voltage at the input port E1 of the microcomputer IC+ remains high or low for a certain period of time, the voltage at the output port 01 of the microcomputer IC+ changes from the NO level to the low level, and the transistor Q4 changes from ON to OFF.

In addition, the output port 0 of the microcomputer I (lit)
1 voltage until the microcomputer XC1 counts the specified time) - At the high level, the transistor Q4 is on, and therefore the relay RL2 is on.

When transistor Q4 turns off, the current flowing through relay coil RL2 is cut off, so relay coil RL2
is also turned off. The connection points of relay coil RL2 on page 3 are power supplies 2 and 3 and heater 6 that heats the base of the iron.
It is connected in series to the series circuit with relay coil RL2.
When turned off, the contact is also turned off, and the current to the heater 6 is cut off. Therefore, safety is ensured.

When using the iron, the microcomputer IC
The voltage of input port E1 of microcomputer I
C+ changes from high level to low level or from low level to high level during time counting.

The microcomputer IC+ re-counts the counting time from all zeros when the input capacitor I+ voltage changes during time counting. are doing.

Problems to be Solved by the Invention In such conventional circuits, the microcomputer IC
+i is used, which has disadvantages such as requiring program development, which lengthens the development period, making the circuit expensive, and making it difficult to change specifications.

The present invention has been made in view of these points, and does not use a microcomputer, so no program development is required, and is composed only of hardware.
The aim is to provide a complete range of safe irons that detect non-use and turn off the heater when not in use.

Means for Solving the Problems In order to achieve the above object, the present invention differentiates the output voltage of the usage state detection switch section, and uses the differentiated output voltage to control the switch section.
The output voltage of the switch section resets the timer circuit section.

Further, the timer circuit section is configured to drive the second switch section to cut off the heater circuit of the iron when the timer circuit section counts for a certain period of time without being interrupted during time counting.

Effect of the present invention With the configuration described above (7), only the change in the output voltage of one position is detected by the differentiating circuit section, and the timer circuit section is reset.

The output voltage of the usage state detection switch section is high level or i
When the d o- level is maintained, the timer circuit section is not reset and performs a time counting operation.

In other words, when the iron is not used and is left standing, the output voltage of the usage state detection switch section will be maintained at the no level or low level, and after a certain period of time has passed, Shut off the heater circuit.

When using the iron, the usage state detection switch turns on and off due to the reciprocating motion of the iron, and the output voltage of the usage state detection switch section changes from a low level to a low level, or from a low level to a high level. changed to
The amount of change is obtained as the output of the differentiating circuit section.

The timer circuit is reset by the output electrician of this differential circuit, and the timer circuit is cleared each time there is a change, so the heater circuit is not shut off, the iron is kept at the operating temperature, and the iron is heated to 6. It is possible to perform baking.

Example An embodiment of the present invention will be explained based on FIG.

In FIG. 1, reference numeral 1 denotes a usage state detection switch section which is turned on and off by the reciprocating movement of the iron body.By turning this usage state detection switch on and off, a low level or high level output voltage is obtained.

Reference numeral 2 denotes a differential circuit section that detects a change in the output power of the usage state detection switch section 1. The first switch section changes from off to on or from on to off depending on the output voltage of the differentiating circuit section 2. 4 is a timer circuit section, which is reset by the output voltage of the switch section 3; That is, when there is no voltage from the switch section 3, the timer circuit section 4 counts the time, and when a certain value is reached, outputs the electric current rJE to drive the second switch section 6. When the voltage is output from the switch section 3, the timer circuit section 4 is reset, the time count is cleared, and the time count is started again from zero.

7'..5 is the above-mentioned second switch section, and when this is on, power is supplied to the heater 6 to heat the iron base.

When the second switch section 6 is turned off, the power supply circuit of the heater 6 is cut off and power supply to the heater 6 is stopped.

The second switch section 6 turns off when the timer circuit section 4
has counted for a specified time, and at this time the timer circuit section 4 outputs a signal to turn off the second switch section 6.

FIG. 2 shows an embodiment of the usage state detection switch 1. As shown in FIG. 7
is a case, 8 is a ball inside the case 7, and 9 is a reflective photointerrupter containing a light emitting diode and a phototransistor. The case 7 is designed so that the ball 8 placed in a horizontal state is placed on the photointerrupter 9. When the ball 8 is placed on the photointerrupter 9, light enters the phototransistor and the phototransistor is turned on.

FIG. 3 is a diagram showing the operation of the usage state detection switch 1.
When the ball 8 is located at the photointerrupter 9, the light emitted from the light emitting diode L1 is reflected by the ball 8 and enters the phototransistor Q1. Therefore, at this time, phototransistor Q1 is turned on.

When the iron is placed on the heel rest, the case 7 is in a vertical position, so the ball 8 is in a photointerlab.

Since the light emitted from the light emitting diode L1, which is located at the end of the case 7 and away from the light emitting diode L1, is not input to the phototransistor Q1, the phototransistor Q1 is turned off. When the iron is in use, the iron body is moved back and forth, so the ball 8 rolls inside the case γ, turning on the phototransistor Q1.

Repeat off.

FIG. 4 shows a specific example of the circuit, and FIG. 5 shows its electrical waveform diagram.

In FIG. 4, portions 1 to 6 surrounded by broken lines correspond to the portions of the block diagram in FIG. 1.

That is, in FIG. 4, reference numeral 1 denotes a usage state detection switch section, in which a specified current is passed from a DC power source E through a resistor R+f to all light emitting diodes L1, causing the light emitting diodes L+i to emit light.

Ql is a phototransistor that detects the light from the light emitting diode L1. R2 is a load resistance of the phototransistor Q1, and the collector voltage ratio (1) of the phototransistor Q1 is at a low level when the phototransistor Q1 is on, and at a 1 level when it is off. 2 is the capacitor G1. In the differential circuit section having a resistor Rsi, the output chamber F:EV2 of the differential circuit section is an electric current! Ev1 goes from low to high,
Or, when it changes from No/I to Low, that change will appear.

Reference numeral 3 denotes a first switch section, which is composed of a transistor Q2 and a load resistor R4. If transistor Q2 turns on,
The collector voltage V3U of the transistor Q2 is at a low level and off, and the s lever VsU is at a high level. Reference numeral 4 denotes a timer circuit section, which performs a time counting operation without being reset if the input voltage v3 to the timer circuit section 4 is maintained at a low level. During time counting, the output voltage v4 of the timer circuit section 4 is
It is level. When the timer circuit section 4 performs a time counting operation for a specified period of time, the output voltage v of the timer circuit section 4
4 becomes low level.

10B-7 When the input voltage v3 of the timer circuit section 4 becomes low level, the timer circuit section 4 is reset, and the input voltage v3 becomes low level.
3 returns from the low level to the high level, the time counting operation starts again from zero. 6 is a second switch section with a resistor Rs.

It consists of R6, transistor Q3+, relay RL, and diode D1. The contacts of the relay RL are configured to turn on and off the power supplied to the heater 6. When the input voltage v4 to the second switch section 6 is at a high level, the transistor Q3 is turned on, the relay RL is turned on and the contacts of the relay are closed, and power is supplied to the heater 6 to generate heat. When the input voltage v4 to the second switch unit 5 is at a low level, the transistor Q5 is turned off, the relay RL is also turned off, and the contacts of the relay are also opened, and power is no longer supplied to the heater 6. Heating is stopped.

FIG. 6(1) shows the voltage waveform of vl. When the time T1 is reached, the phototransistor Q1 is turned on, and the time T1-T2
The phototransistor Q1 is off, the phototransistor Q1id is on from T2 to T3, the phototransistor Q1 is turned off from T5 to T4, and the phototransistor Q1 is on from T4 onward.

That is, during times T1 to T4, the iron is being used, and the phototransistor Q1 is turned on and off due to the reciprocating movement of the iron body. Since time T4, the iron body 1 has been in position and the movement of the iron is in a stopped state, so the movement of the ball 8 of the sensor is stopped and the phototransistor Q1 is kept fully turned on.

FIG. 6(2) shows the voltage waveform of v2. At time T1, the phototransistor Q1 is turned off and the voltage v1 rises and falls, so that this differential output v2 is obtained. The differential output at the time of rising causes the base current to flow through the transistor Q2, turning on the transistor Q2. Therefore, v2 cannot exceed 8"Vng of the base and emitter forward type of transistor Q2. At time T2, phototransistor Q1 is turned on from off, so voltage v1 falls, and the differential output v2 at this time Similarly, at time T6, a differential output that turns on transistor Q2 is obtained, and at T4, a differential output that swings to the negative side is obtained.After T4, there is no change in voltage v1, so differential output v2 is zero. .

In Fig. 6 (3), collector heavy use v6 of transistor Q2 is shown.
shows the voltage waveform of Until time T1, the base input of transistor Q2 is zero, transistor Q2 is off,
Therefore, v3 is at the level of 1, and at time T1 the transistor Q
2 is turned on, so v3 is at low level. When voltage 1fv1 rises and becomes stable, transistor Q2 is turned off. At no-low level time T2, differential output v2 is at low level, so transistor Q2 is turned off. keep it. At time T3, the transistor Q2 is turned on again, and the voltage becomes V3 hello level.

The timer circuit section 4 is reset when v3, which is the input voltage of the timer circuit section 4, is at a low level, and continues normal time counting when it is at a low level.

That is, in FIG. 6 (3), the time count operation is reset at times T1 and T3 when the voltage of v3 becomes low level,
0 time T to set the time count to zero? Thereafter, the input voltage v3 of the timer circuit section is held at a level of 13 to perform a time counting operation.

When the time counting operation of the timer circuit section 4 is finished (
(After the specified time has elapsed) The output voltage of the timer circuit becomes low level (time T5). This is shown in Figure 5 (4).

When the output voltage v4 of the timer circuit section (4) is at a zero level, the transistor Q3 is turned on, and the relay on time is T.
5 and when v4 becomes low level, transistor Q3
As mentioned above, the relay is also turned off.

Effects of the Invention As described above, according to the present invention, it is possible to provide a safe and practically extremely useful iron with an extremely simple circuit configuration that shuts off the heater circuit when the iron is left unattended. can.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the iron of the present invention, Fig. 2 is a sectional view showing an embodiment of the usage state detection switch, Fig. 3 is an explanatory diagram of the operation of the usage state detection switch, and Fig. 4 is FIG. 5 is a voltage waveform diagram of each part of FIG. 4, and FIG. 6 is a conventional circuit diagram. 1... Usage state detection switch section, 2...
・Differential circuit section, 3...First switch section, 4.
...Timer circuit section, 6...Second switch section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 5 (1,1"t T27"T4T5 (2) Custom

Claims (1)

[Claims] A usage state detection switch section that is turned on and off by the reciprocating movement of the iron body, a differentiation circuit section that differentiates the output of the usage state detection switch section, and a first switch section that is turned on and off according to the output of the differentiation circuit section. An iron comprising a timer circuit section that is reset by the output of the switch section, and a second switch section that turns off the heater power supply according to the output of the timer section after a certain period of time has elapsed.