JP5546576B2 - Cooking container detection device - Google Patents

Description

  The present invention relates to a cooking container detection device capable of detecting the presence or absence of a cooking container such as a pan placed on the virtues of a gas stove.

  There is known a cooking container detection device capable of detecting the presence or absence of a cooking container by being pushed down at the bottom of the cooking container when a cooking container such as a pan is placed on the gas stove on the gas stove (Patent Document 1, Patent) Reference 2). In this cooking container detection device, a rod urged upward by a coil spring is slidably attached to an upper end of a support pipe erected substantially at the center of an annular stove burner. In a state where the cooking container is not placed on the virtues, the rod protrudes upward from the virtues. For this reason, when a cooking container is placed on Gotoku, the rod is pushed down at the bottom of the cooking container. Further, when the cooking container on the virtues is removed, the rod that has been pushed down receives the force of the coil spring and returns to a state of protruding upward from the virtues. By detecting such movement with a contact switch or a reed switch, the presence or absence of a cooking container on Gotoku is detected.

JP 2010-25420 A JP-A-8-14573

  However, in the above-mentioned cooking container detection device, if the rod is fixed due to the influence of boiled juice or oil stains, the rod will not return even if the cooking container is removed from Gotoku. There was a problem that it was impossible to do.

  The present invention has been made in response to the above-described problems of the prior art, and is capable of detecting the presence or absence of a cooking container on the virtues without being affected by boiled simmered juice. The purpose is to provide a detection device.

In order to solve the above-described problems, the cooking container detection device of the present invention employs the following configuration. That is,
In a cooking container detection device that detects the presence or absence of a cooking container placed on the virtues of a gas stove,
A rod pushed in at the bottom of the cooking vessel placed on the virtues and biased upward;
Return speed detecting means for detecting a return speed that is a speed at which the rod moves upward when the cooking container is removed from the virtues;
When the return speed is equal to or lower than a predetermined threshold value, an informing means for informing that there is a risk of sticking of the rod;
It is characterized by providing.

  In the cooking container detection device of the present invention, the rod is pushed in with the cooking container placed on the virtues, and when the cooking container is removed from the virtues, the pushed rod moves upward. To return to the original position. The return speed of the rod at this time is determined by the force with which the rod is biased upward, but the return speed decreases when the rod becomes difficult to move due to the influence of boiled juice. Therefore, if it is detected that the return speed has decreased, it can be detected that the rod is difficult to return, and as a result, there is a possibility that sticking may occur, and a notification is given before the sticking occurs. can do. For this reason, since the possibility of sticking can be eliminated and the occurrence of sticking can be avoided, the cooking container detection device can always be maintained in a state where the presence or absence of the cooking container on the five virtues can be detected.

  Moreover, in the cooking container detection device of the present invention described above, by detecting the time required for the rod to return to the position before the cooking container is placed on the virtues after the cooking container is removed from the virtues, The return speed may be detected.

  The position of the rod in a state where the cooking container is placed on Gotoku does not vary greatly depending on the type of cooking container. Therefore, if the time required for the rod to return to the position before the cooking container is placed after the cooking container is removed from Gotoku is detected, a rough return speed can be detected. Of course, if the position of the rod in a state where the cooking container is placed on Gotoku is detected, an accurate return speed can be detected. And it can alert | report at the stage before sticking generate | occur | produces that there exists a possibility that sticking may generate | occur | produce no matter what return speed is used.

  Alternatively, in the above-described cooking container detection device of the present invention, after the cooking container is removed from Gotoku, the rod returns to the position before the cooking container is placed on Gotoku after passing a predetermined position. The return speed may be detected by detecting the return speed by detecting the time required for. The predetermined position can be a predetermined position set above the position of the rod in a state where the cooking container is placed on the virtues.

  In this way, even if the position of the rod when the cooking container is placed on Gotoku varies depending on the type of cooking container, the time after the rod passes the predetermined position is timed, so the type of cooking container Therefore, it is possible to detect the return speed more accurately by suppressing the influence of the different rod positions. The predetermined position is preferably a position that is above the position of the rod, regardless of what cooking container is placed on the virtues. In this way, an accurate return speed can be detected no matter what cooking container is placed on the virtues. However, even if the predetermined position is not necessarily set at such a position, it is possible to suppress the influence of the position where the rod is pushed down depending on the type of cooking container, so that a more accurate return speed can be detected.

  Alternatively, in the above-described cooking container detection device of the present invention, the return speed may be detected by detecting the position of the rod when a predetermined time has elapsed after the cooking container has been removed from Gotoku. .

  Even if it does in this way, it becomes possible to detect an exact return speed, without the position where a rod is pushed down by the cooking container placed on Gotoku being influenced differently by the kind of cooking container.

It is sectional drawing which shows the structure of the gas stove 1 carrying the cooking container detection apparatus 100 of a present Example. 2 is a cross-sectional view showing the internal structure of a thermal head 110. FIG. 3 is an explanatory diagram showing an internal structure of a head position detection unit 180 that detects the position of a thermal head 110. FIG. FIG. 6 is an explanatory diagram illustrating a state in which the resistance value of the head position detector 180 changes according to the position of the thermal head 110. It is a flowchart of the sticking prevention alerting | reporting process which alert | reports the state where sticking is likely to occur. It is explanatory drawing which showed the method of calculating return speed by the 1st modification. It is explanatory drawing which showed the method of calculating return speed by the 2nd modification. It is explanatory drawing which showed the internal structure of the head position detection part 280 of a 3rd modification.

  FIG. 1 is a cross-sectional view showing the structure of a gas stove 1 equipped with a cooking container detection device 100 of the present embodiment. The gas stove 1 is provided by covering the top surface of the stove body (not shown) and having the burner opening 4 formed thereon, and facing the burner opening 4 to burn the fuel gas and cooking. There are provided a stove burner 10 for heating the container, a gorge 20 where a cooking container such as a pan is placed, a cooking container detection device 100 for detecting the presence or absence of a cooking container placed on the virtues 20, and the like.

  The stove burner 10 includes a mixing pipe 11 in which fuel gas and air are mixed, an annular burner body 12 connected to the mixing pipe 11, an annular burner head 14 mounted on the burner body 12, and the like. Yes. The burner body 12 has an outer cylinder 12a made of sheet metal and an inner cylinder 12b made of sheet metal. The upper end of the outer cylinder 12a is bent inward to form an annular seat 12c on which the burner head 14 is seated. Is formed. Further, a plurality of grooves (flame grooves) are formed on the lower surface side of the outer peripheral portion of the burner head 14. When the burner head 14 is placed on the burner body 12, a flame opening 14a is formed between the plurality of flame opening grooves formed in the burner head 14 and the seating portion 12c. Further, a gap between the burner opening 4 established in the top plate 2 and the outer cylinder 12a of the burner body 12 is closed by a burner ring 22 from above. The virtues 20 are placed on the top board 2 so as to surround the burner ring 22.

  A support pipe 18 is provided at the center of the stove burner 10 so as to penetrate the inside of the burner head 14. A substantially cylindrical thermal head 110 is attached to the upper end of the support pipe 18 with respect to the support pipe 18. It is slidably attached. As will be described in detail later, the thermal head 110 incorporates a temperature sensor and a coil spring, and the coil spring urges the thermal head 110 upward. As a result, in the state where no cooking container is placed on the virtues 20, The upper end of the head 110 protrudes from the upper surface (the surface on which the cooking container is placed) of the virtues 20. When the cooking container is placed on the virtues 20, the thermal head 110 is pushed down at the bottom of the cooking container, and the upper end of the thermal head 110 is pressed by a coil spring to be in close contact with the bottom of the cooking container. For this reason, the temperature sensor built in the thermal head 110 can detect the temperature of the bottom of the cooking container. In this embodiment, the thermal head 110 corresponds to the “rod” in the present invention.

  Further, a lead wire is drawn out from the temperature sensor of the thermal head 110, and the lead wire is connected to the control unit 190 through the inside of the support pipe 18. When the cooking container is placed on the virtues 20 and the thermal head 110 is pushed down, or when the cooking containers on the virtues 20 are removed and the thermal head 110 returns to the original position, the support pipe 18 is moved along with the movement. The inner lead wire slides in the axial direction. A head position detection unit 180 that detects the position of the thermal head 110 using the movement of the lead wire is mounted in the middle of the support pipe 18. The structure of the head position detector 180 will be described later. The output of the head position detector 180 is input to the controller 190. The control unit 190 is equipped with a timer 192. Further, a notification lamp 194 is connected to the control unit 190. In this embodiment, the head position detection unit 180 and the control unit 190 correspond to the “return speed detection means” in the present invention. Further, the notification lamp 194 of the present embodiment corresponds to “notification means” in the present invention. The thermal head 110, the head position detection unit 180, the control unit 190, and the notification lamp 194 constitute the cooking container detection device 100.

  FIG. 2 is a cross-sectional view showing the internal structure of the thermal head 110. The thermal head 110 includes a substantially cylindrical inner case 114 formed of sheet metal, a substantially cylindrical outer case 116 that is made of sheet metal and is welded to the outer peripheral side wall of the inner case 114 so as to surround the inner case 114. A heat collecting plate 112 made of metal and welded so as to close the upper end of the inner case 114, a temperature sensor 120 attached to the back side of the heat collecting plate 112, and the like. The temperature sensor 120 may be an element that changes its resistance value according to temperature, such as a so-called thermistor, or an element that generates a voltage according to temperature. The two lead wires 122 drawn from the temperature sensor 120 pass through the inside of the support pipe 18 and are connected to the control unit 190 (see FIG. 1).

  The support pipe 18 is formed to have a substantially flat upper end surface by expanding the diameter near the upper end and then reducing the diameter of the pipe end. The diameter-enlarged portion of the support pipe 18 is inserted inside the inner case 114 and is movable in the axial direction of the inner case 114. Further, the lower end side of the inner case 114 is reduced in diameter so that the inner case 114 does not come out of the support pipe 18 even if the inner case 114 moves while the diameter-enlarged portion of the support pipe 18 is inserted into the inner case 114. ing. Further, a metal coil spring 118 is housed in the inner case 114 in a slightly compressed state. Therefore, the thermal head 110 is always urged upward by the coil spring 118. Further, the lead wire 122 in the portion passing through the inside of the coil spring 118 is rigidly braided with glass fiber so that the lead wire 122 drawn out from the temperature sensor 120 is not bent and pinched by the coil spring 118. Covered by a heat-resistant tube 124. For this reason, when the cooking container is placed on the virtues 20 and the thermal head 110 is pushed down, the lead wire 122 slides in the support pipe 18 in the axial direction. The head position detection unit 180 detects the position of the thermal head 110 using the movement of the lead wire 122.

  FIG. 3A is an explanatory diagram showing the internal structure of the head position detector 180. An opening 18a that is long in the axial direction of the support pipe 18 is formed at one place on the side surface of the support pipe 18 of the present embodiment, and the head position detector 180 is mounted at this position. The head position detection unit 180 includes a rectangular parallelepiped main body 182 in which a resistor (not shown) is accommodated, a slide terminal 184 that slides along the main body 182 while being in contact with the resistor. Both ends in the longitudinal direction of the main body 182 are fixed to the support pipe 18 by brackets 182s. Further, the slide terminal 184 is fixed to the lead wire 122 by a connector 184s. Furthermore, a lead wire 185 is drawn out from one end of the resistor housed in the main body 182 and the slide terminal 184, and the lead wire 185 is connected to the control unit 190.

  When the cooking container is placed on the virtues 20, the thermal head 110 is pushed down, and the lead wire 122 slides in the axial direction in the support pipe 18. Since the slide terminal 184 is fixed to the lead wire 122 via the connector 184s, the slide terminal 184 also moves. As a result, in a state where the cooking container is placed on the virtues 20 (when there is a pan), the slide terminal 184 comes to the position shown in FIG. On the other hand, when the cooking container placed on Gotoku 20 is removed, the pressed thermal head 110 is pushed up by the coil spring 118, and the lead wire 122 and the slide terminal 184 are moved by the movement of the thermal head 110. As a result, the slide terminal 184 comes to the position shown in FIG. 3C in a state where the cooking container is not placed on the virtues 20 (when there is no pan). Further, the slide terminal 184 slides while contacting a resistor housed in the main body 182. For this reason, the resistance value between the lead wire 185 drawn from one end of the resistor and the lead wire 185 drawn from the slide terminal 184 changes according to the position of the slide terminal 184.

  FIG. 4 is an explanatory view exemplifying how the resistance value changes depending on the position of the slide terminal 184 (and hence the position of the thermal head 110). In the illustrated example, the resistance value between the two lead wires 185 is small (resistance value Ra) when there is a pan (the state of FIG. 3B), and when there is no pan (the state of FIG. 3C). The resistance value is large (resistance value Rb). This relationship can be reversed depending on the position where the lead wire 185 is drawn from the resistor. Further, between the resistance values Ra and Rb, the resistance value linearly changes as the slide terminal 184 moves. Therefore, the control unit 190 can detect the position of the slide terminal 184 (the position of the thermal head 110) by detecting the resistance value between the two lead wires 185. Further, the controller 190 has a built-in timer 192. For this reason, the moving speed of the slide terminal 184 (the thermal head 110) can be detected by measuring the time using the timer 192.

  Here, when the user of the gas stove 1 lifts the cooking container on Gotoku 20, the cooking container is not gradually lifted little by little. Accordingly, the cooking container is lifted almost instantly from at least the five virtues 20. For this reason, the thermal head 110 that has been pushed down at the bottom of the cooking container immediately returns to its original state (a state that protrudes above the five virtues 20) by the biasing force of the coil spring 118. However, if the thermal head 110 is difficult to move due to boiled juice or oil stains during cooking, the biasing force of the coil spring 118 is weakened by the frictional force, so it takes time to return to the original state. It becomes like this. Therefore, if the moving speed (return speed) of the thermal head 110 when the cooking container placed on the virtues 20 is removed is detected, the thermal head 110 is difficult to move (that is, sticking is likely to occur). It is thought that it can be detected.

  The cooking container detection apparatus 100 according to the present embodiment uses such a mechanism to notify that the sticking is likely to occur at a stage before the sticking occurs. As a result, the thermal head 110 becomes difficult to move (or stops moving) due to the sticking, and it is possible to avoid a situation in which the presence or absence of the cooking container cannot be detected. Hereinafter, the process which the cooking container detection apparatus 100 of a present Example detects and alert | reports the state where sticking is likely to occur is demonstrated.

  FIG. 5 is a flowchart of the sticking prevention notifying process for notifying the state where sticking is likely to occur. This process is executed by a computer (not shown) installed in the control unit 190. When the sticking prevention notification process is started, it is determined whether or not a cooking container has been placed on Gotoku 20 (STEP 10). Whether or not the cooking container has been placed is detected, for example, by detecting that the resistance value of the head position detection unit 180 is equal to or less than a certain value, or by detecting that the decrease in the resistance value has stopped. be able to. Hereinafter, such a resistance value is referred to as a resistance value Ra (see FIG. 4). Note that the resistance value Ra varies somewhat depending on the shape of the bottom of the cooking container placed on the virtues 20.

  As a result, when it is determined that the cooking container is not placed (STEP 10: no), the same determination is repeated to enter a standby state, but when it is determined that the cooking container is placed (STEP 10: yes), in the future Then, it is determined whether or not the cooking container has been removed from the top of Gotoku 20 (STEP 12). When the cooking container is removed, the resistance value of the head position detection unit 180 increases. Therefore, if an increase in the resistance value is detected, it is determined that the cooking container has been removed. If the cooking container has not been removed (STEP 12: no), the resistance value of the head position detector 180 is monitored to enter a standby state, but if it is determined that the cooking container has been removed (STEP 12: yes), the timer 192 is immediately used. The time measurement according to is started (STEP 14).

  Subsequently, it is determined whether or not the thermal head 110 has returned to the original position, that is, whether or not the slide terminal 184 has returned to the position of FIG. 3C (STEP 16). This determination can be made based on whether or not the resistance value of the head position detection unit 180 has reached the resistance value when there is no pan (resistance value Rb shown in FIG. 4). As a result, if it is determined that the resistance value has not increased to Rb and the thermal head 110 has not returned to the original position (STEP 16: no), the resistance value of the head position detector 180 is monitored. To enter standby mode. When it is determined that the resistance value has reached Rb and the thermal head 110 has returned to the original position (STEP 16: yes), the timer 192 is stopped (STEP 18).

  Then, the moving speed (return speed) when the thermal head 110 returns to the original position is calculated (STEP 20). That is, the moving distance of the thermal head 110 is calculated from the difference between the resistance value Ra of the head position detector 180 when there is a pan and the resistance value when there is no pan (here, the resistance value Rb). As shown in FIG. 4, since the amount of movement of the thermal head 110 (slide terminal 184) and the amount of change in resistance value are proportional, the difference value of resistance values (here, Rb-Ra) is multiplied by a proportional coefficient. Then, the moving distance of the thermal head 110 can be calculated. Then, the return speed of the thermal head 110 is calculated by dividing the moving distance by the time value of the timer 192.

  Here, the accurate moving distance of the thermal head 110 is calculated using the difference value between the resistance value Ra when the pan is present and the resistance value Rb when the pan is not present, and the accurate moving distance is obtained using the obtained moving distance. The return speed was calculated. However, for simplicity, it can also be as follows. That is, as the movement distance of the thermal head 110, a typical movement distance stored in advance is used, and this movement distance is divided by the time measured value of the timer 192 so as to calculate a rough return speed. May be.

  Subsequently, it is determined whether or not the calculated return speed is equal to or less than a predetermined threshold (STEP 22). As a result, if the return speed is greater than the threshold (STEP 22: no), the thermal head 110 is moving quickly, so it is determined that there is no possibility of sticking, and the sticking prevention notification process is performed as it is. finish.

  On the other hand, when the return speed is equal to or lower than the threshold (STEP 22: yes), the return of the thermal head 110 is deteriorated due to the influence of boiled juice or oil stains. It is thought that there is a risk of sticking. Therefore, after flashing the notification lamp 194 to notify that there is a possibility of sticking (STEP 24), the sticking prevention notifying process is terminated. In this embodiment, the notification is performed using the notification lamp 194, but the notification may be performed using a buzzer or by outputting sound from a speaker.

  In this way, before the thermal head 110 is fixed and the presence or absence of the cooking container on the virtues 20 can no longer be detected, the user of the gas stove 1 is notified that there is a possibility of sticking, and the gas stove 1 measures such as cleaning can be encouraged. For this reason, since it is possible to prevent the thermal head 110 pushed down at the bottom of the cooking container from sticking and returning, it is possible to always detect the presence or absence of the cooking container on the virtues 20.

  There are several modifications of the cooking container detection device 100 of the present embodiment described above. Hereinafter, these modified examples will be briefly described focusing on differences from the cooking container detection device 100 of the present embodiment.

  In the embodiment described above, by measuring the elapsed time until the resistance value of the head position detection unit 180 increases from the resistance value Ra in the state with a pan to the resistance value Rb in a state without a pan, the thermal head 110 The description has been given assuming that the return speed is calculated. However, by setting a resistance value Rc that is larger than the resistance value Ra in the state where there is a pan, and by measuring the elapsed time until the resistance value of the head position detector 180 increases from the resistance value Rc to the resistance value Rb, The return speed of the thermal head 110 may be calculated.

  FIG. 6 shows a method of the first modified example for calculating the return speed in this way. As described above, the resistance value Ra when there is a pan varies depending on the type of cooking container placed on the virtues 20. On the other hand, if the resistance value Rc is set to be larger than the resistance value Ra of various cooking containers, the resistance value Rc can be determined from any cooking container (or most cooking containers). The elapsed time until the resistance value Rb is increased is counted. In other words, in any cooking container (or most cooking containers), the elapsed time required for the thermal head 110 to travel the same moving distance is counted. For this reason, if the movement distance of the thermal head 110 is obtained in advance, the thermal distance can be obtained simply by dividing the obtained movement distance by the time value of the timer 192 regardless of the type of the cooking container placed on the virtues 20. The return speed of the head 110 can be calculated.

  Further, in the above-described embodiment, the head position detection unit 180 measures heat by measuring the elapsed time until the resistance value increases from a certain resistance value (resistance value Ra or resistance value Rc) to a certain resistance value Rb. It has been described that the return speed of the head 110 is calculated. However, the return speed of the thermal head 110 may be calculated by measuring the amount of change in the resistance value during the lapse of a fixed time.

  FIG. 7 exemplifies the method of the second modified example for calculating the return speed in this way. In the illustrated example, when it is determined that the cooking container has been removed from the top of Gotoku 20 (corresponding to STEP12: yes in the flowchart of FIG. 5), the timer 192 starts counting (corresponding to STEP14). Then, when a predetermined time has elapsed, the resistance value of the head position detector 180 is detected. FIG. 7 shows a case where the resistance value Rd is detected in this way. By multiplying the value of the difference between the resistance value Ra and the resistance value Rd by a proportional coefficient, the moving distance of the thermal head 110 (slide terminal 184) can be obtained. Therefore, when the moving distance is divided by a predetermined time, the thermal head 110 returns. The speed can be calculated. In the method of the second modified example as described above, regardless of the type of cooking container placed on the virtues 20, the movement distance obtained from the resistance value of the head position detection unit 180 is simply divided by the predetermined time, and the thermal sensitivity. The return speed of the head 110 can be calculated.

  Further, in the above-described embodiment, it has been described that the return speed of the thermal head 110 is detected by continuously detecting the position of the thermal head 110 from the resistance value of the head position detection unit 180. However, even if the position of the thermal head 110 cannot be detected continuously, the return speed of the thermal head 110 can be detected. Hereinafter, such a third modification will be described.

  FIG. 8A is an explanatory diagram showing the internal structure of the head position detector 280 of the third modification. The head position detector 280 of the third modification is also attached to an opening 18 a provided on the side surface of the support pipe 18, similarly to the head position detector 180 described above. In addition, a pressing portion 186 is fixed to the lead wire 122, and the pressing portion 186 also moves when the lead wire 122 slides in the support pipe 18 in the axial direction. Further, the head position detector 280 of the third embodiment is not provided with the main body 182 or the slide terminal 184 that accommodates the resistor, but instead is provided with two contact switches 187a and 187b. . A lead wire 188 is drawn from each contact switch 187a, 187b and connected to the control unit 190.

  When the cooking container is placed on the virtues 20, the lead wire 122 moves with the movement of the thermal head 110 being pushed down, and the pressing portion 186 moves accordingly. As a result, as shown in FIG. 8B, the pressing portion 186 presses the contact switch 187b, and the contact switch 187b is turned on. When the cooking container is removed from the top of Gotoku 20, the thermal head 110 is pushed up by the coil spring 118 to return to the original position. Along with this, the lead wire 122 and the pressing portion 186 move, the pressing portion 186 presses the contact switch 187a, and the contact switch 187a is turned on. Therefore, the control unit 190 detects the return speed of the thermal head 110 by measuring the elapsed time after the contact switch 187b switches from ON to OFF until the contact switch 187a switches from OFF to ON. Is possible.

  The cooking container detection device 100 according to the present embodiment and various modifications has been described above, but the present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the scope of the present invention. It is.

1 ... gas stove, 2 ... top plate, 4 ... opening for burner,
10 ... Stove burner, 11 ... Mixing tube, 12 ... Burner body,
14 ... Burner head, 18 ... Support pipe, 20 ... Goku,
DESCRIPTION OF SYMBOLS 100 ... Cooking container detection apparatus, 110 ... Thermal head, 112 ... Heat collecting plate,
114 ... inner case 116 ... outer case 118 ... coil spring,
120 ... temperature sensor 122 ... lead wire 180 ... head position detector
184 ... Slide terminal, 185 ... Lead wire, 186 ... Pressing part,
187a, b ... contact switch, 188 ... lead wire, 190 ... control unit,
192 ... Timer, 194 ... Notification lamp, 280 ... Head position detector

Claims (4)

In a cooking container detection device that detects the presence or absence of a cooking container placed on the virtues of a gas stove,
A rod pushed in at the bottom of the cooking vessel placed on the virtues and biased upward;
Return speed detecting means for detecting a return speed that is a speed at which the rod moves upward when the cooking container is removed from the virtues;
When the return speed is equal to or lower than a predetermined threshold value, an informing means for informing that there is a risk of sticking of the rod;
A cooking container detection device comprising: In the cooking container detection device according to claim 1,
The return speed detecting means detects the time required for the rod to return to a position before the cooking container is placed on the five virtues after the cooking container is removed from the five virtues. A cooking container detection device characterized by detecting a speed. In the cooking container detection device according to claim 1,
The return speed detecting means is required for the rod to return to a position before the cooking container is placed on the virtues after passing the predetermined position after the cooking container is removed from the virtues. The cooking container detection device characterized by detecting the return speed by detecting time. In the cooking container detection device according to claim 1,
The return speed detecting means detects the return speed by detecting the position of the rod when a predetermined time has elapsed after the cooking container is removed from the virtues. Container detection device.

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