JPH0299271A - Soldering iron - Google Patents

Abstract

PURPOSE:To allow easy changing and checking of setting of a heater temp. during operation by selectively displaying the present temp. and set and stored heating temp. of the heater on a temp. display panel in accordance with the selecting operation of the display selector switch provided to the soldering iron body. CONSTITUTION:A control device 16 has a CPU 17. The operation signals of the display selector switch SW1 and a temp. setting switch SW2 and the output voltage of a thermocouple 8 digitized via an A/D converter 19, i.e., the present temp. of the heater 2 are inputted to the CPU 17 via an input circuit 18. A display circuit 20 which controls the operation of the temp. display panel 6 is connected via an output circuit 21 to the CPU 17 and the temp. display panel 6 is operated according to the command of the CPU 17. A memory 22 connected to the CPU 17 has a ROM which stores the control program and initial set value, etc., of the CPU 17 and a RAM which is used for temporary storage, etc., of the arithmetic results and data by the CPU 17. A heater operating circuit 25 controls the operation of the heater 25 in accordance with the control signal outputted from the CPU 17.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a soldering iron.

Conventional Technology Soldering irons that heat copper rods, etc. using a heater formed by winding a heating wire around a mica plate have been used for a long time, but these conventional soldering irons generally have a power of 60W.

Since the specified power is uniquely determined, such as 80W, it is very inconvenient to use multiple soldering irons depending on the purpose in order to perform soldering work under various temperature conditions. Met.

Therefore, in recent years, a soldering iron main body equipped with a heater and a power supply unit that supplies power to the soldering iron main body are configured separately, and the current, voltage, etc. are controlled in the power supply unit to increase the temperature of the heater. A humidity setting means for changing the temperature, various operation switches for operating the temperature setting means, a temperature display panel for displaying the heater temperature, etc. are provided, so that a single soldering iron can be used under various temperature conditions depending on the purpose. A so-called soldering iron is often used.

Problems to be Solved by the Invention However, in conventional temperature-controlled soldering irons that change the heater temperature by controlling the current and voltage supplied to the soldering iron body, there is a problem with the outside temperature, which affects the heat dissipation of the heater. Accurately controlling the heater temperature was difficult because the parameters were not taken into account.

In addition, various operation switches for operating the temperature setting means and a temperature display panel for displaying the heater temperature were installed on the power supply side, separate from the soldering iron body, so the heater temperature could be set during soldering work. When changing or checking the heater temperature, it is necessary to reach out to the power supply section and operate various operation switches, which is troublesome and has the disadvantage of poor workability.

An object of the present invention is to solve the drawbacks of the prior art described above, to provide a soldering device that can accurately control the heater temperature, and that allows the user to easily change the heater temperature setting and check the heater temperature during soldering work. The objective is to provide the following.

Means for Solving the Problems In order to solve the above problems, the present invention provides a soldering iron consisting of a soldering iron main body equipped with a heater and a power supply section.
The soldering iron body includes a temperature detection means for detecting the current temperature of the heater, a temperature setting storage means for setting and storing the heating temperature of the heater, and a current temperature of the heater detected by the temperature detection means and a temperature setting memory. The operation of the heater is controlled based on the heating temperature of the heater set and stored in the means, and the temperature display panel provided on the soldering iron main body is controlled based on the switching operation of the display changeover switch provided on the soldering iron main body. The present invention is characterized in that it includes a control means for selectively displaying the current temperature of the heater and the heating temperature that has been set and stored as appropriate.

The operation control means controls the operation of the heater based on the current temperature of the heater detected by the temperature detection means and the heating temperature of the heater set and stored by the temperature setting storage means provided in the soldering iron body. The current temperature of the heater and the stored heating temperature are selectively displayed on a temperature display panel provided on the soldering iron main body based on a switching operation of a display changeover switch provided on the soldering iron main body.

Actual drop example Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 is a front view showing a soldering iron in one embodiment;
The figure is a side view showing the soldering iron 1, and the soldering iron 1 is
The grip part 5, which is composed of a soldering iron main body 3 equipped with a heater 2 and a power supply part 4, and which constitutes a part of the soldering iron main body 3, includes:
Is the current temperature of heater 2 or the stored heating temperature set by a command from the control means? A temperature display panel 6 for selectively displaying the heating temperature of the heater 2, a temperature setting switch 2 and a display changeover switch SW1 forming part of a temperature setting storage means for setting and storing the heating temperature of the heater 2 are provided. It is electrically connected to the supply section 4 by a cable 7.

The heater 2 also has a thermocouple 8 (
(Fig. 3) is provided.

A mounting plate 10 to which an annular heater mount 9 having a male thread 9a formed on the outer periphery is fixed is attached to a mounting body 5a formed in a cross-shaped protrusion at one end of the grip portion 5 of the soldering iron main body 3. One end of the heater 2 is fitted and fixed inside the heater mount 9, and the heater 2 is mounted through the heater mount 9.
The other end is fitted with a soldering iron tip 12, which is a hollow stepped columnar body with a conical portion 12a formed at its tip. The body 13 is a stepped columnar body having an inner diameter slightly larger than the large diameter part 12b of the tip 12, and the opening 13a at one end of the body 13 is a stepped columnar body. Stepped portion 12c
A flange (not shown) is formed at the other end opening to engage with a fixing nut 14 screwed onto a male thread 9a formed on the outer periphery of the heater mount 9.
By removing the fixing nut 14 from the male thread 9a of the heater mount 9, the iron tip 12 can be replaced.

The power supply unit 4 has a terminal 1 that fits into a household power socket.
5 is provided, and AC power is supplied from normal indoor wiring.

FIG. 3 is a block diagram of main parts showing the configuration of the control device 16 provided in the soldering iron main body 3 and the power supply section 4 connected to the control device @16 via the cable 7.

The control device 16 is a microprocessor (hereinafter simply CPU).
) 17, and the CPU 17 receives the operating signals of the display changeover switch S-1 and the temperature setting switch S-2 through the input circuit 18, and the digitalized thermocouple 8 through the A/D converter 19. It is configured so that the output voltage, ie, the current temperature of the heater 2, is input. A display operating circuit 20 for controlling the operation of the temperature display panel 6 is connected to the CPU 17 via an output circuit 21, and operates the temperature display panel 6 according to commands from the CPU 17. The memory 22 connected to the CPU 17 includes a ROM that stores control programs and initial setting values for the CPU 17, and a RAM that is used to temporarily store calculation results and data by the CPU 17.

The power supply unit 4 is provided with a transformer 23 that converts the voltage input to the terminal 15, and the AC voltage output from the transformer 23 has its waveform adjusted through a waveform generation circuit (not shown) and then sent to the CPU 17 of the control device 16. A clock signal is input to the circuit, and it becomes an operating power source for the CPU 17 and the like via a constant voltage circuit 24 equipped with a rectifier circuit and a smoothing circuit. A heater operating circuit 25 that controls the operation of the heater 2 receives the voltage input directly to the terminal 15 and controls the operation of the heater 2 based on a control signal output from the CPU 17 via the output circuit 21 of the control device 16. .

Hereinafter, the heating temperature (hereinafter simply referred to as target value) of the heater 2 in the soldering iron 1 of this embodiment will be set.

Operation control of the heater 2 and display switching of the temperature display panel 6 will be explained with reference to a flowchart (see FIG. 4) showing an outline of the processing operation of the CPU 17.

The terminal 15 of the power supply section 4 is fitted into a household power socket, and the transformer 23. The CPU 17, which is connected to the power supply via the constant voltage circuit 24 and the cable 7, performs initialization processing, and then reads the initial value 1"lin of the heater heating temperature from the ROM of the memory 22, and registers R for storing the target value TS. (Step S1), it is determined whether or not an operation signal from the display changeover switch S-1 is input, that is, whether there is a request to set a target value (Step 82).

If the operation signal from the display changeover switch SW1 is input and it is necessary to set a target value, the process moves to step S3, and the target value setting/display process from step 83 to step S9 is executed.

First, the CPU 17 sets the timer t to a predetermined time (2 seconds in this embodiment) and starts the timer t. Next, it is determined whether or not the operation signal of the temperature setting switch SW2 has been input (step 84), and if it has been input, the operation signal is input again.
A predetermined time is set and started in the timer t, and the step width ΔT of the temperature set value is added to the value of the register R (Ts > that stores the target value) and the result is stored in the register R (S) (step S5). If the value of register R(Ts), i.e.
The lower target value S is a value obtained by adding the step size ΔT of the temperature setting value to the initial value 1-m1n of the heater heating temperature. Next, it is determined whether the target value TS stored in the register R (S) has reached the maximum settable value Tmax of the heater heating temperature (step S6), the maximum settable value Tll1a×,
If the target value Ts has not been reached, the process moves to step S8 and the target value Ts is displayed on the temperature display panel 6. Next, it is determined whether the predetermined time set in the timer t has elapsed (step 89), and if the predetermined time has not elapsed, the process returns to step S4.

If the operation signal of the temperature setting switch Nishiki 2 is detected within 2 seconds after confirming the operation signal from the display changeover switch 1 in step S2, or after the operation signal of the temperature setting switch 2 is confirmed. If the operation signal of the temperature setting switch hand 2 is detected again within 2 seconds, unless it is determined in step S6 that the target value TS has reached the maximum settable value T wax of the heater heating temperature,
The same process as described above is repeatedly executed, and each time the operation signal of the temperature setting switch 2 is detected in step S4, the target value Ts is incremented by the step width ΔT of the temperature setting value, and the incremented target value TS is Register R(T
S) and displayed on the temperature display panel 6.

The operator operates the temperature setting switch SW2 while checking the target value lower S displayed on the temperature display panel 6 to increment the target value TS, thereby setting the heating temperature of the heater 2, that is, the target faTs.

While performing such processing, in step S6 the target value lower S is the maximum settable heater heating temperature tfJT ma
When it is determined that x has been reached, the CPU 17 resets the initial value Tm1n of the heater heating temperature in the register R (Ts) that stores the target value (step 87), and repeats the same process as described above. to enable workers to set appropriate target values.

When the setting of the target value lower S is completed, by leaving the temperature setting switch 2 as it is, step S will be executed approximately 2 seconds after the last operation of the temperature setting switch 2.
Automatically returns to 2.

If the input of the operation signal from the display changeover switch SW1 is not detected in step S2, the output voltage of the thermocouple 8 digitized via the A/D converter 19, that is, the current temperature Tn of the heater 2 is read. Store the current temperature of heater 2 in register R (Tn) (step 510).
, the display operating circuit 20 is operated to display the current temperature 7n of the heater 2 on the temperature display panel 6 (step 517).

Next, compare the current temperature Tn of the heater 2 stored in the register R(Tn) with the heating temperature of the heater 2 stored in the register R('rs), that is, the set target 1iITs (step 512). If the current temperature Tn of the heater 2 has not reached the target value T3, it is determined whether the flag F1, which is set when the heater 2 starts operating, is set (step 513). Since the flag F1 is not set at this time, the heater operating circuit 25 is activated to start heating the heater 2 and the flag F1 is set (step 514), and then the process returns to step S2.

In step S2, it is determined whether or not the operation signal from the display changeover switch SW1 is input in the same manner as the previous time. If the operation signal from the display changeover switch 5ll11 is not input, the current temperature lower end of the heater 2 is Read and update to register R (Tn>), go to step 5lop, activate display operating circuit 20, and display heater 2 on temperature display panel 6.
The current temperature Tn of is updated and displayed (step 511).

Next, the current temperature Tn of the heater 2 updated and stored in the register R ('rs) is compared with the target value lower S stored in the register R ('rs) (step 512), the current temperature Tn of the heater 2 is compared. is not far from the target value TS, heater 2
It is determined whether the flag F1, which is set at the start of operation of the flag F1, is set (step 513).
Since 1 has already been set, the process returns to step S2.

Thereafter, in step S2, it is determined that the operation signal from the display changeover switch SW1 has been input, or in step S812
The same process as described above is repeated until it is determined that the current temperature Tn of the heater 2 has fallen below the target value S. During this time, the current temperature Tn of the heater 2 gradually increases and the temperature display The current wetness level Tn of the heater 2 is constantly updated and displayed on the panel 6, but if it is determined in step 812 that the current temperature Tn of the heater 2 has reached the target value TS, when the heater 2 stops operating, It is determined whether the flag F1 to be reset has been reset (step 515).

Since the flag F1 has not been reset at this time, after stopping the operation of the heater 2 and resetting the flag F1 (step 816), the process returns to step S2.

In this way, in step 812, the current temperature 1 of the heater 2 is
1! [If it is determined that Tn has reached the target value TS, stop the operation of the heater 2 (Step 816); If it is determined that the current temperature Tn has not reached the target value Ts, start the heater 2. (Step $14) As a result, the operation is controlled so that the current temperature Tn of the heater 2 is maintained at the target value Ts.

Moreover, when confirming the heating set temperature of the heater 2, that is, the target value, the display changeover switch S11 is operated.

The operation signal from the display changeover switch SWI is at step S.
2, and the CPL 117 performs steps 83 to 83 described above.
Target value setting/display processing up to step S9 is executed.

At this time, if temperature setting switch SW2 is not operated, C
After setting the predetermined time to the tine t and starting it (step 33), the PU 17 displays the target value Ts stored in the register R (TS) on the temperature display panel 6 for about 2 seconds until the set time of the tine t ends. Display step S8),
At step S9, the end of the set time of timer t is confirmed, and at the same time, the process returns to step S2.

In addition, if the target value Ts is not set by operating the display changeover switch 1 immediately after the power is turned on to the CPtJ17, the initial value of the heater heating temperature stored in the register R (Ts) in the heat up S1 will be used. Tm1n becomes the target value, and the temperature of the heater 2 is controlled to maintain the initial value T min by the operation control of the heater 2 described above. Therefore, if there is a problem if heater 2 starts heating at the same time as the power is turned on, set the initial value Tll1in to below room temperature, for example, 0°C, to prevent heater 2 from starting. In addition, if it is convenient to pre-heat heater 2, set the initial value To+
It is also possible to set the temperature of the heater 2 in advance in advance so that the temperature of the heater 2 is automatically heated to -1-1 degrees above the temperature.

Effects of the Invention According to the present invention, since the operation of the heater is controlled based on the current temperature of the heater and the heating temperature set and stored, the heater temperature can be accurately controlled without being affected by changes in outside temperature. In addition, the temperature setting storage means for setting and storing the heating temperature, the temperature display panel for displaying the current temperature of the heater, the heating temperature set and stored, and the display changeover switch are all provided on the soldering iron main body. You can easily change the heater temperature settings and check the heater temperature at hand.

[Brief explanation of drawings]

FIG. 1 is a front view showing a soldering iron according to an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. FIG. 4 is a flowchart showing an outline of the processing operation of the microprocessor. DESCRIPTION OF SYMBOLS 1... Soldering iron, 2... Heater, 3... Soldering iron main body, 4... Power supply part, 5... Gripping part, 5a...
・Rib, 6...Temperature display panel, 7...Cable,
8...Thermocouple, 9...Heater mount, 9a...
Male screw, 10... Heat sink, 11↓... Screw, 12...
・Soldering iron tip, 12a...conical part, 12b...large diameter part,
12c... Stepped part, 13... Soldering tip mounting body, 13a
... One end frontage part, 14 ... Fixed puttsu, 15 ...
Terminal, 16... Control device, 17... Microprocessor, 18... Input circuit, 19... A/D converter,
20...Display operation circuit, 21...Output circuit, 22.
...Memory, 23...Transformer, 24...Constant voltage circuit, 25...Heater operating circuit, SW1...Display changeover switch, SW2...Lagomi rate setting switch. 3rd mouth/' AC100V 1st cause diagram solder;・Te main salary first cause

Claims (1)

[Claims] In a soldering iron consisting of a soldering iron main body equipped with a heater and a power supply section, the soldering iron main body includes a temperature detection means for detecting the current temperature of the heater, and a temperature setting means for setting and storing the heating temperature of the heater. a storage means, a current temperature of the heater detected by the temperature detection means and a heating temperature of the heater set and stored in the temperature setting storage means; and control means for selectively displaying the current temperature of the heater and the heating temperature that has been set and stored on a temperature display panel provided on the soldering iron body based on a switching operation of a display changeover switch. Trowel.