JP3132808B2 - Thermocouple sensor for detecting tip temperature - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric soldering iron to which a temperature control device for controlling a tip temperature to a desired temperature is attached. The present invention relates to a thermocouple sensor for detecting a tip temperature used for transmitting the temperature to the temperature control device.

[0002]

2. Description of the Related Art To properly solder electric wiring,
In particular, it is necessary to appropriately set the temperature of the iron tip of the electric soldering iron. Therefore, an electric soldering iron provided with a temperature control device configured so that the tip temperature can be adjusted to a desired temperature is conventionally provided.

[0003] In the past, such a conventional electric soldering iron does not directly detect the temperature of the tip of the tip, but is sealed with a ceramic element at the tip of a heater for heating the tip. A thermosensitive part of the thermocouple sensor is arranged, the temperature of this part is detected, and the temperature of the tip of the tip is estimated from the detected temperature. Since the estimation is performed based on such estimated tip temperature, there is a problem that accuracy is lacking.

In order to solve the above problems, the present applicant has proposed an electric soldering iron capable of controlling the temperature of the tip accurately and with good responsiveness (Japanese Patent Laid-Open No. 7-40).
No. 037, hereinafter referred to as the first conventional example of the present applicant).

The first prior art electric soldering iron of the present applicant is an electric soldering iron for heating a tip by a heater, and the control means controls the heater based on a detected tip temperature. In an electric soldering iron that controls the temperature of the iron tip to a desired temperature by adjusting the amount of current supplied to the iron tip, a temperature sensor for detecting the temperature of the iron tip is attached near the tip of the iron tip. Electric soldering iron.

[0006] In the above-mentioned first conventional electric soldering iron of the present applicant, specifically, one using a thermocouple sensor as the temperature sensor is shown. A contact point of the thermocouple sensor is fixed to the tip (pointed end), and a pair of sensor wires of the thermocouple sensor is inserted through a groove formed near a boundary between the tip of the tip and the cylindrical base. There has been proposed an extension extending between the outer periphery of the cylindrical base and the heater cover and extending from the rear end thereof.

In this electric soldering iron, the temperature of the tip (tip) of the tip is directly detected by a thermocouple sensor, and the amount of power to the heater is adjusted by control means based on the detected temperature. Therefore, the tip temperature is more accurately controlled to the set temperature.

Thus, in the above-described first conventional electric soldering iron of the present applicant, the important problem of accurately controlling the temperature of the iron tip can be solved. Since the contact part (thermosensitive part) of the thermocouple sensor is pulled out and fixed to the tip part (pointed tip), the sensor element wire near the contact part is exposed to the outside, and these parts are surrounded by soldering work. There is a risk of damage due to collision with various articles. Of course, there is a means for protecting the sensor wires exposed to the outside, but it is necessary to recognize a problem that the number of manufacturing steps is slightly increased.

Further, in the above-described first conventional electric soldering iron of the present applicant, the sensor wire of the thermocouple sensor is provided with an insulating coating in accordance with the common general knowledge for avoiding a short circuit. However, in order to avoid damage due to burning or the like of the insulating coating, it is necessary to extend the sensor wire backward through the space between the cylindrical base of the tip having a relatively low temperature and the heater cover. In order to pass through such a narrow part, it is necessary to make the sensor strand itself thin. As described above, the vicinity of the contact portion of the sensor wire exposed to the outside of the thermocouple sensor is more likely to be disconnected more easily when colliding with various peripheral articles during soldering work or the like as described above. Becomes

Therefore, in the above-mentioned first conventional example of the present applicant, when a thermocouple sensor is used as a temperature sensor, the quality is good, but the temperature is close to the contact portion of the thermocouple sensor. If protection means and the like are provided, the configuration becomes slightly complicated, and the number of processing and assembling steps is increased, resulting in a problem that the cost is slightly increased.

The present applicant has proposed a structure for mounting a thermocouple sensor on a tip for the purpose of solving the above problems (Japanese Patent Application Laid-Open No. Hei 8-219899; Conventional example).

In the second conventional example of the present applicant, the temperature of the tip is detected and a detected temperature signal is supplied to temperature control means for controlling the amount of electricity to the heater for heating the tip. In the mounting structure of the thermocouple sensor to the tip, the thermocouple sensor is constituted by a pair of uncoated sensor wires, and the heat-sensitive portion is fixed to the tip of the tip, and The pair of sensor element wires extending from the portion, the rear end of the pointed head in a state where neither an external force that makes strong contact with each other or an external force that makes strong contact with any conductor member including the tip is applied It is configured to be connected to the tip temperature signal receiving end of the temperature control means which is drawn into the hollow portion of the cylindrical base extending from the base, and which is drawn to the rear side of the cylindrical base. It is a mounting structure of a thermocouple sensor.

In this electric soldering iron, the temperature of the tip of the iron tip is directly detected by the thermocouple sensor, so that the actual temperature of the tip of the iron tip is accurately detected. The amount of power to the heater is adjusted by the temperature control means based on the temperature of the tip of the tip, so that the temperature of the tip of the tip is not only during idling but also during the actual soldering operation.
Control is performed with good responsiveness and accuracy.

In this electric soldering iron, an uncoated sensor wire of the thermocouple sensor is used. However, even if contact occurs directly or indirectly in the middle of the sensor wires, the sensor wires are not covered with each other. In the worst case where the weak coating does not work effectively, the contact resistance between wires is about 500 to 1 kΩ or more. In practice, the temperature of the tip of the tip is detected. No abnormalities occur. With the heating of the tip, an oxide film is formed on the surface of the sensor element wire, which further increases the electrical resistance between the wires.
It is not easily destroyed by the power of the thermoelectromotive voltage of the order. This also reinforces the reason why no detection abnormality occurs.

According to the second conventional example of the applicant of the present invention, since the thermocouple sensor is constituted by uncoated sensor wires, the thermocouple sensor of the first conventional example of the present applicant is not included. In comparison with this, a sensor wire having a large diameter can be employed, and therefore, the risk of disconnection due to a collision with an article or the like around the sensor wire exposed at the tip of the tip can be considerably reduced. That is what we can do.

Thus, the applicant's second conventional example is an excellent one that has solved many of the problems of the previous soldering iron. However, the thermocouple sensor used is a pair of sensor wires. There is a problem arising from the above, that is, when assembling a soldering iron or replacing a soldering iron, there is a possibility that the signal line extended from the control means at the subsequent stage may be erroneously connected with the polarity of the sensor wire, Is a pair, so it is still not possible to use a sufficiently large diameter.Because the sensor wire is a pair, the structure to extend these from the tip of the tip to the rear grip side is sufficient. Problems remain, such as inability to simplify.

[0017]

SUMMARY OF THE INVENTION The present invention, in particular, has all the advantages of the second conventional example of the present applicant, and solves the above-mentioned problems remaining therein, and provides a thermocouple. An object of the present invention is to provide a thermocouple sensor having a simple structure in a soldering iron, which eliminates the possibility of erroneous polarity when a sensor is connected to a signal line of a control means at a subsequent stage. Another object of the present invention is to provide a thermocouple sensor capable of increasing the diameter of a sensor wire.

[0018]

According to the present invention, a temperature of a tip is detected, and an obtained detected temperature signal is supplied to a temperature control means for controlling an amount of electricity to a heater for heating the tip. Do
In the thermocouple sensor for detecting the tip temperature, the tip is also used as one conductor constituting the thermocouple sensor,
One end of the other conductor constituting the thermocouple sensor is connected to a part of the pointed tip, which is a required temperature detection part of the tip, to form a contact, and the tip is used as a heat-sensitive part to detect a tip temperature. Thermocouple sensor.

Therefore, according to the thermocouple sensor for detecting the temperature of the tip of the present invention, the thermocouple sensor is constituted by the tip constituting one of the conductors and the other conductor connected to the required temperature detecting portion. In other words, since there is only one conductor other than the iron tip, in the soldering iron using this, first, the other conductor can be constituted by a large-diameter sensor element wire. For example, a sensor wire having a wire diameter of 0.45 mm or more can be adopted without any problem. Therefore, during soldering work, etc.
Even if the exposed part of the tip of the sensor wire at the tip of the tip collides with any surrounding articles, there is no risk of it being easily broken, and the sensor wire should be used with confidence. Can be. In addition, since the other conductor can be constituted by a large-diameter sensor element wire in this way, there is no need to provide a protection means, and there is an advantage that the structure is simplified.

Further, since the other conductor can be constituted by a large-diameter sensor element wire, the "stiffness" of itself can be strengthened, and a plug is not attached to the end of the conductor. It is also possible to directly insert and connect to the socket which is the receiving end of the temperature signal of the control means. Since the plug is not required, the number of assembling steps is reduced, and the number of parts is reduced, so that the cost can be reduced.

Further, since the conductors constituting the thermocouple sensor have completely different shapes like the sensor tip and the sensor element wire, when the soldering iron is assembled or the tip is replaced, etc. When connecting to the signal line from the control means, there is no danger of incorrectly connecting the polarity, and these operations are simplified. Also, in the assembly process, only one sensor wire is attached to the tip by spot welding etc.
Since the process is simplified and only one sensor wire is used, problems such as erroneous classification of the sensor wire corresponding to the polarity can be completely eliminated. Further, since only one sensor element wire is used, the manufacturing cost can be reduced.

The electric soldering iron to which the present invention is applied can exhibit the same temperature detecting ability as the first and second conventional examples of the present applicant.

The electric soldering iron to which the present invention is applied is, of course, used in the same manner as the first and second conventional examples of the present applicant. By energizing the heater to generate heat, the tip is heated and soldering is performed. At this time, the amount of power to the heater is adjusted by the temperature control means based on the temperature of the tip of the tip detected by the thermocouple sensor, and the temperature of the tip of the tip is set by the user. The temperature will be controlled.

In the electric soldering iron to which the present invention is applied, as described above, the thermocouple sensor is constituted by the tip that also serves as one conductor and the other conductor, and one end of the other conductor is required. A contact point is formed by connecting to a part of the tip of the iron tip, which is a temperature detection part, and the contact point is used as a heat-sensitive part. The detection is performed, whereby the actual temperature of the tip of the tip is accurately detected.

In the present invention, as described above, the tip itself is also used as one of the conductors constituting the thermocouple sensor. However, the thermocouple sensor has two different conductors. When a closed circuit is created by using the phenomenon that a thermoelectromotive force is generated when the temperature of the two junctions is different and the current flows (Seebeck effect), the tip Naturally, there is no problem in theory, but it is possible to realize the same temperature detection capability as that of a general thermocouple sensor that does not share a tip in experiments.

Therefore, as described above, in the thermocouple sensor of the present invention in which one of the conductors also serves as the tip, there is no possibility that the detection result will be abnormal, and therefore, the heater based on this is not affected. Is accurately controlled and can be adjusted accurately.

In the electric soldering iron to which the present invention is applied, similarly to the second conventional example of the present applicant, any one of the tip and the other conductor constituting the thermocouple sensor can be used. However, even if such a configuration is adopted, no detection abnormality occurs for the same reason as described for the second conventional example of the present applicant, and Accurate detection of head temperature can be performed.

The other conductor is, for example, so that a portion other than one end connected to a part of the tip of the tip, which is the one conductor, does not directly or indirectly come into strong contact with the tip. While being drawn into the hollow portion of the cylindrical base extending from the rear end of the tip of the tip of the trowel, and extended toward the control means through a guide hole penetrating the insulating support of the heater inserted into the cylindrical base. With this configuration, there is no possibility that a short-circuit accident between one of the conductors, the iron tip, and the other conductor, which may cause abnormal temperature detection, may occur.

Even in the case of such a configuration, there is a possibility that contact occurs between the two conductors, for example, at a portion of the other conductor other than the portion inserted into the guide hole of the insulating support of the heater. In this case, it appears that a short circuit has occurred, but if such a contact was made with a weak force and was merely a mere contact, practically no abnormal temperature detection would occur . The reason is the same as described in the second conventional example of the present applicant.

In the above-described thermocouple sensor for detecting the temperature of the tip, the iron-plated portion on the surface of the tip is used as one conductor of the thermocouple sensor, and the other conductor is used as the conductor. A contact can be made by connecting to the iron-plated part of the tip of the tip, and in this case, iron was adopted as one conductor, and the corresponding conductor was used as the other conductor. The conductor is made of a suitable material, and the appearance is very simple, only one conductor is connected to a part of the tip of the tip, and it is only connected to the plating layer on the surface. Therefore, it is very easy.

Of the above-mentioned tips, a body made of copper is used as one conductor of the thermocouple sensor, and the other conductor is connected to the body of the tip of the tip to form a contact. In this case, copper is used as one conductor, and a conductor made of a suitable material is used as the other conductor. This is an extremely simple configuration that is only connected to a part of the tip of the tip. The other conductor is connected to the inside of the plating layer, but can be implemented by a simple process.

In each of the above two cases, that is, when the iron-plated portion of the iron tip is used as the one conductor, and when the main body made of copper is used as the one conductor, A sensor element wire made of constantan can be used as the other conductor, and in this case, an accurate thermocouple sensor can be very easily formed.

[0033]

Embodiments of the present invention will be described below in detail based on an embodiment with reference to the accompanying drawings. 1 to 4 show an embodiment of the present invention. FIG. 1 shows a tip constituting a thermocouple sensor and having a heater inserted into a hollow portion of a cylindrical base portion thereof. FIG. 2 is a partially cut-away schematic front view of a soldering iron incorporating a soldering iron tip constituting a thermocouple sensor, and FIG. 3 is a main view of a soldering iron incorporating a soldering iron tip of one embodiment. FIG. 4 is a partially cutaway exploded front view showing components, and FIG. 4 shows a tip of a thermocouple sensor according to one embodiment and a general thermocouple sensor when a large number of carbon resistors are continuously soldered at the same time. It is a change curve figure of each measured temperature at the time of measuring the change of temperature.

As shown in FIGS. 1 and 3, the tip 1 to which this embodiment is applied has a pointed tip 11 having a tapered tip.
And a cylindrical tubular base 12 extending rearward from the rear end of the pointed head 11. The surface of the pointed head 11 is located at the boundary between the pointed head 11 and the cylindrical base 12. A communication hole 1a communicating from the side into a hollow portion 12a formed in the cylindrical base 12 is formed. The tip 1 is a pointed head 1
An iron plating layer 1b is applied to the entire surface including the base 1 and the cylindrical base 12. The main body of the tip 1 is made of copper.

In the vicinity of the tip of the pointed tip 11 of the tip 1, an uncoated wire made of constantan and having a wire diameter of 0.5 mm
Of the sensor wire 2 is fixed by spot welding.
The spot welding of the sensor wires 2 is performed on the iron plating layer 1b of the tip 1, and the iron plating layer 1b and the sensor wires 2 constitute a thermocouple sensor. Thus, the contact between the two conductors formed by the above welding, that is, the contact between the iron plating layer 1b and the sensor element wire 2 becomes the heat-sensitive portion.
The sensor element wire 2 has the outer surface of the pointed head 11 crawling toward the cylindrical base 12 from the spot welded part, which is a heat-sensitive part, and opens at the boundary between the pointed head 11 and the cylindrical base 12. The cylindrical base 12 is drawn into the hollow portion 12a through the communication hole 1a.

The thermocouple sensor for detecting the tip temperature of this embodiment is configured as the tip 1 as described above, and the detected temperature is determined by the existing technology of the sensor wire 2. From the end and the portion of the iron plating layer 1b of the iron tip 1 provided at the end of the tubular base 12, the temperature can be transmitted to a temperature control device (not shown).

The above-mentioned iron tip can be incorporated in a soldering iron as follows, for example. As shown in FIG. 1, first, the heater 3 is inserted into the hollow portion 12a of the cylindrical base portion 12 of the tip 1, and at the same time, the heater 3 is formed along the axial center of the insulating support of the heater 3 at the same time. The sensor element wire 2 drawn into the hollow portion 12a is inserted through the guide hole 3a.

As shown in FIG. 2, the rear part of the tip 1 prepared as described above, that is, the rear end side of the cylindrical base part 12 is inserted into the front end side of the front grip part 4a constituting the grip 4. And fix it. As shown in FIG. 3, the front grip portion 4a is basically cylindrical, and an inner sleeve 5 having a locking flange 5a on the rear outer periphery as shown in FIG. As shown in FIG. 2, the supporting flange 5a is engaged with an engaging step 14a formed near the center of the inner periphery of the front grip portion 4a, and the spring 7 is disposed in the front cylinder. The member 8 is disposed behind the member 8 and the front end thereof presses the locking flange 5a of the inner sleeve 5 toward the locking step 14a. The rear end side of the cylindrical base 12 of the tip 1 is inserted into the thus arranged and positioned inner sleeve 5 from the front end side.

Then, a hollow fixing bolt 6 as shown in FIG. 3 is inserted into the distal end side of the front grip portion 4a while covering the tip 1 in the hollow portion, and the male screw portion 6 is formed.
b is formed on the front grip portion 4a.
b, and fix it by tightening. At this time, the inner sleeve 5 is tightened by the tapered portion 6a in the hollow portion of the hollow fixing bolt 6, and the cylindrical base portion 12 of the tip 1 inserted therein is similarly tightened by this, and It will be fixed.

As described above, the heater 3 inserted into the cylindrical base portion 12 of the tip 1 fixed to the front grip portion 4a, as shown in FIG.
b is inserted into sockets 10a and 10b disposed at ends of a power supply line from a power supply controlled by the temperature control device, and electrically connected thereto, and via a support member (not shown) supporting the sockets 10a and 10b. Supported by the cylindrical base 1
2 is stabilized in the hollow portion 12a.

The heater 3 is, as shown in FIG.
It is supported by an insulating support made of a columnar ceramic material, and has a structure having a heat generating portion only in a portion close to the outer periphery of the first half portion. Needless to say, the heat generating portion is formed of the insulating support. It is electrically connected to two electrodes 3b, 3b provided at the rear end.

As shown in FIG. 2, the iron plating layer 1b constituting the thermocouple sensor is disposed in the front cylinder of the support member 8 so as to contact the rear end of the cylindrical base 12 of the tip 1. It is electrically connected to a subsequent temperature control device (not shown) via the spring 7, the support member 8 and the signal line connected thereto. Further, it penetrated through the guide hole 3a of the heater 3,
Similarly, the sensor wire 2, which is the other conductor constituting the thermocouple sensor, is fitted into a socket 9 disposed at the end of a signal line extended from a temperature control device (not shown), and is electrically connected.

The power supply line and the signal line are connected to the rear grip portion 4.
b is drawn into the grip 4 through the rear end. The rear grip portion 4b is screw-connected to the front grip portion 4a, the former front end female screw 14c, and the latter rear end male screw 14d.

The temperature control device compares the temperature of the tip 1 detected by the thermocouple sensor with the set temperature set by the user, and adjusts the amount of electricity supplied to the heater 3 to thereby control the temperature. This is a general device for controlling the temperature of the tip 1 to a set temperature.

In this example, since the tip to which the present invention is applied is incorporated in a soldering iron as described above, it is used and operates as follows. The electric soldering iron of this example is similar to a normal electric soldering iron of this type, in that the heater 3 is energized from a power supply unit of the temperature control device via a power supply line to generate heat, and the heat is used to generate a tip. 1 is heated to perform a soldering operation.

In this electric soldering iron, the sensor wire 2 is welded and fixed to the iron plating layer 1b at the tip of the tip 11 of the iron tip 1, and the iron plating layer 1b and the sensor element The wire (Constantan) 2 constitutes a thermocouple sensor.
The spot-welded portion serving as the contact point becomes a heat-sensitive portion, and the temperature of the tip 11 of the tip 1 is detected by the heat-sensitive portion, and the detected temperature information obtained as an electric signal is transmitted to the sensor element wire 2 and the sensor wire 2. A signal line to be connected, the iron plating layer 1b,
The signal is transmitted to the signal processing unit of the temperature control device through the spring 7, the support member 8, and the signal line. In a temperature control device (not shown), the power supply unit determines the amount of power to be supplied based on the processing result of the signal processing unit, and supplies the amount of power to the heater 3 through a power supply line to perform an appropriate heating operation. Control is performed so that the tip 11 of the tip 1 is set to the set temperature.

The signal processing performed by the signal processing unit is as follows.
Needless to say, the detection is performed based on the detected temperature information of the tip 11 of the tip 1 received in real time and the preset temperature set by the user in advance.

When the actual work of soldering is performed using this electric soldering iron, the tip 1, especially the pointed tip 1
1 is cooled by solder, an electric component to be soldered, or the like. In this embodiment, as described above, the heat sensitive portion of the thermocouple sensor is formed on the tip 11 of the The temperature of one cusp 11 is directly detected.

Therefore, the temperature of the tip 11 of the tip 1 can be detected without a time delay, and the amount of power to the heater 3 can be immediately controlled based on the detection result. Therefore, the temperature of the tip 11 of the tip 1 can be adjusted in real time and accurately, and the precise adjustment of the soldering temperature required in the soldering of precision electrical components is accurately performed. Can be.

In this electric soldering iron, the iron plating layer 1b provided on the surface of the tip 1 as a conductor constituting the thermocouple sensor and a sensor wire (Constantan)
As described above, the thermocouple sensor utilizes the Seebeck effect. Even if the iron plating layer 1b of the tip 1 also serves as one of the conductors, it is theoretically possible. Of course has no problem,
It is possible to realize the same temperature detection capability as that of a general thermocouple sensor not using a tip.

FIG. 4 shows the results of the detection of the temperature of the tip of the electric soldering iron by the above-mentioned thermocouple sensor, and the pair of heat sensitive parts fixed to the pointed head 11 of the tip 1 of the electric soldering iron. FIG. 6 shows a result of detecting a tip temperature by another thermocouple sensor including the sensor wires (iron and constantan) of FIG.

The electric soldering iron was first set at a set temperature of 25.
After setting to 0 ° C. and idling, the set temperature is raised to 350 ° C., and both scale conditions are adjusted to 25 ° C./scale. After changing the set temperature to 250 ° C and idling, start the pen recorder and set the set temperature to 350 ° C.
Change to ° C and stabilize. Thereafter, the soldering work was performed twice for 42 continuous 1/4 W carbon resistance leads set on the universal substrate, 21 leads each.

The lower one of the upper and lower temperature change curves in FIG. 4 is the detection result A of the thermocouple sensor of the present embodiment, and the upper one is that of the conventional thermocouple sensor using a pair of sensor wires. This is the detection result B.

A comparison between the two shows that the detection result A of the thermocouple sensor of the present embodiment has a slightly larger amplitude than the detection result B of the conventional thermocouple sensor. This is due to the fact that the mounting positions of the heat-sensitive portions arranged on the pointed head 11 of the tip 1 are slightly different. That is, since it is difficult to attach two heat sensitive portions at the same position on the pointed tip 11 of the same tip 1, the heat sensitive portion of the thermocouple sensor according to the present embodiment is slightly different from the conventional one. Since it was located on the tip side, detection result A
Is larger than the amplitude of the detection result B. Note that the tip of the tip is tapered and has a small heat capacity, and the solder is directly in contact with the soldering object. Therefore, the amplitude of the temperature change is larger than that of the base, and this is an experience. Also known.

Except for the above difference in the amplitude of the temperature change, both the temperature change curves are almost the same, and it can be understood that the thermocouple sensor of the present embodiment sufficiently functions as a sensor.

Therefore, as described above, in the thermocouple sensor of the present invention, there is a possibility that the detection result may be abnormal because the iron plating layer 1b of the tip 1 is also used as one conductor. Therefore, the control of the amount of electricity to the heater 3 based on this is also accurately performed.

Further, in the electric soldering iron of this example, the uncovered one is used for the sensor element wire 2 which is the other conductor of the thermocouple sensor. There is no abnormality in the detection of the temperature of the cusp 11. This is apparent from the detection result shown in FIG. 4, but the reason is as described above.

Briefly, even though the sensor element wire 2 is uncoated, it is connected to the iron plating layer 1b.
Unless intentional high pressure contact is made with a flathead screwdriver, for example, the contact resistance between the sensor element wire 2 and the iron plating layer 1b is essentially at least 50.
This is because there is a value of about 0 to 1 kΩ or more, and in addition, an oxide film is formed by heating, and this is not destroyed by the electromotive force normally generated by the thermocouple sensor.

Therefore, the thermocouple sensor of this embodiment is
Since the uncoated sensor element wire 2 is used as one of the conductors, and the iron-plated layer 1b of the tip 1 is used as the other conductor, one sensor element 2
As a result, there is some margin in the mounting space. However, in this embodiment, as described above, the sensor element wire 2 having a sufficiently large diameter of 0.5 mm is used.

Therefore, even if the exposed portion of the sensor wire 2 on the outer surface of the pointed tip 11 of the tip 1 comes into contact with something during the soldering operation or the like, as described above. ,
Because of the large diameter, there is almost no risk of disconnection. Therefore, it is not necessary to provide a protection means or the like for protecting the wire in order to prevent disconnection.

As described above, the diameter of the sensor element wire 2 is
By increasing to 0.5 mm, the "stiffness" of itself becomes stronger, and without attaching a plug to the end,
Socket 9 which is the end of the temperature control device that receives the tip temperature signal
It is now possible to insert and connect directly to Therefore, the number of assembling steps is reduced, and a plug is not required, which leads to cost reduction.

Since the conductors constituting the thermocouple sensor have completely different shapes like the iron plating layer 1b covering the iron tip 1 and the sensor element wire, the soldering iron is assembled or the tip is replaced. In such a case, when connecting the signal line from the temperature control device at the subsequent stage to the socket 9, there is no possibility that the polarity is erroneously connected, and these operations are simplified.

In the assembling process, one sensor element wire 2 is attached to the iron plating layer 1b at the tip of the tip 11 of the tip 1 by spot welding. Since it only extends rearward through the hollow portion 12a of the cylindrical base 12, the process is simplified, and only one sensor wire 2 is used, so that the type of the sensor wire corresponding to the polarity is incorrect. Problems can be completely eliminated. Further, since only one sensor element wire 2 is used, the manufacturing cost can be reduced.

[0064]

Therefore, according to the thermocouple sensor for detecting the temperature of the tip of the present invention, the conductor other than the tip becomes one, so that in the soldering iron using this, first, the other conductor is used. Can be constituted by a large-diameter sensor element wire. Therefore, even if a part of the sensor wire tip exposed to the outside at the tip of the tip of the sensor collides with any surrounding articles during soldering work or the like, it may be easily broken. Without it, it can be used with confidence. In addition, since the other conductor can be constituted by a large-diameter sensor element wire in this way, there is no need to provide a protection means, and there is an advantage that the structure is simplified.

Further, since the other conductor can be constituted by a large-diameter sensor element wire, the "strain" of itself can be strengthened, and a plug is not attached to the end of the conductor. It is also possible to directly insert and connect to the socket which is the receiving end of the temperature signal of the control means. Since no plug is required, the number of assembling steps is reduced, and the cost can be reduced.

Also, since the conductors constituting the thermocouple sensor have completely different shapes like the sensor tip and the sensor wire, when the soldering iron is assembled or the tip is replaced, etc. When connecting to the signal line from the temperature control means, there is no danger of connecting to an incorrect socket having the opposite polarity, and these operations are simplified.

In the assembling process, only one sensor element wire is attached to the tip by spot welding or the like, so that the process is simplified, and only one sensor element wire is used. It is possible to completely eliminate such a problem that the type of the sensor element wire is wrong. Further, since only one sensor element wire is used, the manufacturing cost can be reduced.

Also, in the electric soldering iron to which the present invention is applied, as described above, the thermocouple sensor is constituted by the tip which also serves as one conductor and the other conductor, and one end of the other conductor is connected. Since the contact point is configured by being connected and fixed to a part of the tip of the tip of the iron that is the temperature required detecting section, and the contact point is used as the temperature sensing section,
The temperature of the required temperature detecting portion of the tip of the tip is directly detected, whereby the actual temperature of the tip of the tip is accurately detected.

Further, in the present invention, as described above, the tip itself is also used as one of the conductors constituting the thermocouple sensor, but the thermocouple sensor has two types of different conductors. When a closed circuit is created by using the phenomenon that a thermoelectromotive force is generated when the temperature of the two junctions is different and the current flows (Seebeck effect), the tip Naturally, there is no problem in theory, but it is possible to realize the same temperature detection capability as that of a general thermocouple sensor that does not share a tip in experiments.

In the electric soldering iron to which the present invention is applied, similarly to the second conventional example of the present applicant, any one of the soldering tip and the other conductor constituting the thermocouple sensor can be used. However, even if such a configuration is adopted, no detection abnormality occurs for the same reason as described for the second conventional example of the present applicant, and Accurate detection of head temperature can be performed.

That is, the other conductor, for example, a portion other than one end connected to a part of the tip of the tip, which is the one conductor, does not directly or indirectly come into strong contact with the tip. In this way, it is drawn into the hollow portion of the cylindrical base extending from the rear end of the tip of the tip of the iron tip, and is directed to the control means side through a guide hole penetrating the insulating support of the heater inserted into the cylindrical base. With such a configuration, there is no possibility that a short circuit accident between one of the soldering tips and the other, which may cause abnormal temperature detection, may occur.

Even in the case of such a configuration, there is a possibility that contact between the two conductors may occur between the two conductors, for example, at a portion other than the portion of the other conductor inserted into the guide hole of the insulating support of the heater. In this case, it appears that a short circuit has occurred, but if such a contact was made with a weak force and was merely a mere contact, practically no abnormal temperature detection would occur . The reason is as described above.

In the above-mentioned thermocouple sensor for detecting a tip temperature of the present invention, the iron-plated surface of the tip is used as one conductor of the thermocouple sensor and the other conductor is used as the conductor. When a contact was made by connecting to the iron-plated part of the tip of the tip, iron was adopted as one conductor, and a conductor of an appropriate material was adopted as the other conductor. In terms of appearance, the configuration is very simple, in which only one conductor is connected to a part of the tip of the tip of the iron, and it is very easy to connect itself to the plating layer on the surface. In addition, a heat-sensitive portion is formed directly on the required temperature detecting portion of the tip, so that more accurate temperature detection can be performed.

Of the above-mentioned tips, the body made of copper was used as one conductor of the thermocouple sensor, and the other conductor was connected to the body of the tip of the tip to form a contact. In this case, one conductor was made of copper, and the other conductor was made of a suitable material,
In terms of appearance, it is a very simple configuration in which only one conductor is connected to a part of the tip of the tip. The other conductor is connected to the inside of the plating layer, but can be implemented by a simple process. In addition, a heat-sensitive portion is formed directly on the required temperature detecting portion of the tip, so that more accurate temperature detection can be performed.

In each of the above two cases, that is, when the iron-plated portion of the tip is used as the one conductor, and in the case where the body made of copper is used as the one conductor, A sensor element wire made of constantan can be used as the other conductor, and in this case, an accurate thermocouple sensor can be very easily formed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a tip of a thermocouple sensor in a state where a heater is inserted into a hollow portion of a cylindrical base portion thereof.

FIG. 2 is a partially cut-away schematic front view of a soldering iron in which a thermocouple sensor is incorporated and a soldering tip is incorporated.

FIG. 3 is a partially cutaway exploded front view showing main components of a soldering iron in which a soldering tip according to an embodiment is incorporated.

FIG. 4 shows the results of measuring the change of the tip temperature when the continuous thermosetting operation of a large number of carbon resistors is performed simultaneously by the thermocouple sensor of the embodiment and the general thermocouple sensor. FIG. 4 is a diagram showing a change curve of a measurement temperature.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Iron tip 1a Communication hole 1b Iron plating layer 11 Pointed head 12 Cylindrical base 12a Hollow part 2 Sensor wire 3 Heater 3a Guide hole 3b Electrode 4 Grip 4a Front grip part 4b Rear grip part 14a Locking step part 14b Female Screw 14c Female screw 14d Male screw 5 Inner sleeve 5a Locking flange 6 Hollow fixing bolt 6a Tapered portion 6b Male screw portion 7 Spring 8 Support member 9 Socket 10a, 10b Socket A Detection result of thermocouple sensor of this embodiment B Conventional Results of thermocouple sensor using a pair of sensor wires

Claims (4)

(57) [Claims] An apparatus for detecting a temperature of a tip and supplying an obtained detected temperature signal to temperature control means for controlling an amount of electricity supplied to a heater for heating the tip. In the thermocouple sensor, the tip is also used as one of the conductors constituting the thermocouple sensor, and a thermocouple sensor is formed on a part of the pointed tip which is a required temperature detecting portion of the tip. A thermocouple sensor for detecting a tip temperature by forming one end of the other conductor to form a contact and using the contact as a heat-sensitive portion. 2. An iron-plated part of the surface of the tip is used as one conductor of the thermocouple sensor, and the other conductor is connected to the iron-plated part of the tip of the tip to form a contact. A thermocouple sensor for detecting a tip temperature according to claim 1. 3. A main body made of copper among the above-mentioned tips is used as one conductor of a thermocouple sensor, and the other conductor is connected to the main body of the tip of the tip to form a contact. The thermocouple sensor for detecting a tip temperature according to claim 1. 4. The thermocouple sensor for detecting a tip temperature according to claim 2, wherein a sensor element wire made of constantan is used as the other conductor.