JPH09320754A - Heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and easily perform specialized and elusive use of a small capacity, high performance, and general purpose microwave heater for cooking of a large amount of foods. SOLUTION: A selective startup robot 13 is provided opposite to an operation key of a commercially available heater 1, a door opening robot 14 and a door closing detector each are provided opposite to a door, a heater 1 connected thereto, storing a sequence and a time at a specified operation for each robot, actuating the robot according to a storage sequence every door closing, and provided with a controller for repeating this is placed on a rack 31 in which six doors are near to each other, faced on their front face, an inexpensive, high performance heater incorporating a number of general-purpose softwares is changed to an exclusive facility for specific used, and a large amount of high quality foods can be heated with microwaves.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the thawing of frozen foods, etc.
The present invention relates to a large-scale food heating apparatus using microwaves.

[0002]

2. Description of the Related Art Food freezing technology has been rapidly advanced, and it is common knowledge that materials such as tuna are stored and transported in a frozen state, and processed and cooked foods or semi-finished products are mass-processed in factories and then frozen. The number of cases where final heating is performed immediately before being supplied to customers at fast-food restaurants has increased, and excellent uniform quality has been evaluated, and cooking from ingredients in stores is gradually being pursued.

On the other hand, the progress of the thawing technique is slow, and traditional thawing, running water thawing, refrigerator thawing, etc. are widely used. It is recognized that thawing frozen foods using microwaves has high energy efficiency, shortens the time, and reduces the amount of waste due to damage.In recent years, it has begun to enter the food industry, but its speed is slow and it is not widely spread. . It can be said that the first cause is that the defrosting device suitable for each frozen food is not supplied.

Defrosting using a home-use microwave oven had the bad image that the center portion remained frozen despite the boiling corners, but recently, the excellent phrase of defrosting was used as a catchphrase. The products have been improved to the point that they are marketed by each company. The essence of the technology is not only the improvement of uniform heating performance but also USP445.
The concept called weight defrost disclosed in No. 3066 is largely responsible. In this method, the intermittent ratio of about three stages and the optimum value of the heating time at each intermittent ratio are determined according to the material shape and weight of the food, and the microwave is intermittently irradiated according to the pattern. Further, Japanese Patent Laid-Open No. 7-253216 also discloses a technique focusing on heat conduction inside food, but in any case, it is necessary and sufficient to prevent partial overheating in order to perform good thawing with microwaves. It is necessary to irradiate various powers with a heating pattern according to the heat conduction characteristics of food. Therefore, the ability to develop cooking software that determines the optimum heating pattern determined by the material, shape, and weight of each food is important for each food, and hardware that can easily install the cooking software is essential.

1,0 according to this concept
Some products have been equipped with an IC card that can store 00 kinds of heating patterns and can call any one, as well as the development of cooking software by an expert and the sale of an IC card equipped with that software. 2A and 2B show an example of the product. FIG. 2A is a front view, FIG. 2B is a right side view, and FIG. 2C is a plan view. Briefly explaining this product, the left and right side surfaces and the upper surface are protected by the stainless steel metal box 2, the IC card insertion port cover 3 and the fixing screw knob 4 are provided on the right side surface, and the door 5 and its handle are provided on the front surface. 6 occupies a large part, and an operation part 7 is composed of a display part 8, a numeric key 9 and a start key 10 on the upper part thereof, an intake port 11 is located on the lower part, and an exhaust port on the side surface and a flat surface. I can see 12.

Introducing the case of thawing nine frozen Nakatoro sushi products in 2 minutes and 30 seconds. First, IC card 153
Assume that the street address is programmed with expert-developed decompression software. The cover 3 is removed, the IC card is attached, the cover 3 is attached again, and the screw knob 4 is rotated and fixed. Pull the handle 6 from 3kg to 4kg to open the door 5, put 9 pieces of frozen sushi in the heating chamber, close the door 5 again, and then press the number 1 key out of the number keys 9 and the key 5 and then the key 3 Then, press the start key 10 after calling the program stored at the address 153 by pressing in the order. With this, heating starts and after 2 minutes and 30 seconds the heating ends with a buzzer sound, so the handle 6 is pulled again to open the door 5 to the state shown by the broken line in the plan view, and 9 pieces of frozen sushi are taken out from the heating chamber. .

[0007]

Since this type of product has a heating chamber volume equivalent to that of a household microwave oven, it is sufficient for use in a general home or a small dining room, but it is not suitable for food factories and food industries. When it comes to the so-called defrosting, there is a definite lack of capacity. For example, in a factory that prepares thousands of meals and tens of thousands of meals a day, the defrosting capacity for 9 people in 2 minutes and 30 seconds is less than 900 hours in 4 hours even if the time for taking in / out food and key operation is ignored. I can't process it. To decompress 10,000 people, 12 units are required for simple calculation.

However, even if 12 units are prepared, the problem of manpower will be raised next time. If you need a total of 30 seconds to open and close the door, put food in and out, and operate the keys, 12 units will take 6 minutes, which is a calculation that one person cannot work. Food factories are becoming more labor-saving, and food is flowing on the belt.

The first ideal solution is a belt conveyor type equipment equipped with the above-mentioned defrosting software, and the second is the realization of a defroster having a dramatically large heating chamber volume. However, the realization of the first plan is technically difficult, and the second plan is economically difficult. In other words, the development cost of tens of millions of yen is tens of millions of dollars, but the cost per household is small if it sells tens of thousands, but this kind of product with different specifications cannot bear the burden very much. is there.

Therefore, as a practical third method, it is possible to use a robot instead of a person, but a robot that can perform three different kinds of work, food loading / unloading, door opening / closing, and key selection activation is considerably high-grade. It is supposed to be expensive. The method using three kinds of single-function robots can be considered next, but this is not easy either. For example, even if it is limited to the activation of key selection, even if only 12 or half of them are operated, the operation is unexpectedly difficult. First of all, it is necessary to fix the positions of the 6 units with at least millimeter accuracy, and it is necessary to determine which of the 6 units contains the frozen food, avoid collision with other robots, and end signal. Furthermore, it is necessary to provide a means for confirming whether or not the selection and activation are properly performed. Therefore, as a more realistic method, even if humans perform some of the three tasks, microwave defrosting foods must be solved unless problems such as position fixing in millimeters, food presence / absence determination, collision avoidance, and signal exchange are solved. The introduction to industry does not progress.

[0011]

To solve the above problems, the present invention takes the following means.

[0012] A plurality of or a single small-capacity heaters arranged close to each other with the respective doors facing the front, and a selective start robot, a door opening robot and a door closing detector attached to each, It has a controller to which these robots and detectors are connected, and the controller performs a predetermined selective start operation for the selective start robot and a door open operation after the heating end time of the heater for the door open robot. Is performed for the corresponding heater each time the door closing is detected.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality or a single small-capacity heaters arranged close to each other with each door facing the front, and a selective start robot, a door opening robot, and a door closing attached to each heater. It has a detector and a controller to which these robots and detectors are connected, and the controller performs a predetermined selective activation operation for the selective activation robot and after the heating end time of the heater for the door opening robot. Door opening operation,
In order to implement a configuration in which the relevant heater is performed each time the door closing is detected, six commercially available microwave defrosters as small-capacity heaters are placed close to each other with each door facing the front. Mounted on the top, a movable lever and drive solenoid are located at positions facing the heater selection key and start key as a selective start robot, a door open lever and drive solenoid as a door open robot, and a micro switch as a door close detector. Attached to the small-capacity heater, connect each robot and micro switch using a commercially available sequencer as a controller, and close the micro switch to energize the drive solenoid for the movable lever facing the key in order of predetermined time. However, the door opening solenoid is set to be energized at a predetermined time. Various problems that occur when one robot operates six decompressors are solved by attaching six small robots to each decompressor.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a view showing the appearance of the small-capacity heater 1 as described above, that is, the microwave defroster having the internal volume of about 18 liters which is currently commercially available. FIG. 3 is a front view (a), a side view (b) and a plan view (c) of the heater showing a state in which the selective activation robot 13 and the door opening robot 14 are attached to the commercially available heater. Selective activation robot 1
3 is fixed to the upper surface of a commercially available heater and is provided with 11 key-in levers 15-1, 15-2, ..., 15-9, 15-0 and 15-S, and the tip of each key-in lever is the above-mentioned operation. Opposite the ten number keys and the start key of the section 11. The suffix number matches the number on the opposite key, for example 15-8 faces the number 8 key. 15-S
Faces the start key. The other end (termination) of each key-in lever is solenoid 16-1, 16-2, ...,
Connected to 16-0 and 16-S actuators, the suffix means to correspond to the same numbered key, and S corresponds to the start key.

A fixing portion 17a of a sheet metal Z-shaped bracket 17 is fixed to the right side surface of the door 5 and the right side portion of the handle 6. The door opening robot 14 is fixed to the right side surface of the heater,
The door opening lever 18 and the door signal switch 19 attached thereto face the receiving portion 17b of the receiving bracket 17. The door opening lever 18 is fixed rotatably around a fulcrum 20, and the other end is connected to an actuator of a door opening solenoid 21. The solenoid 21 has a suction capacity of 4 kg or more required for opening the door. Each robot is usually covered with a protective metal cover, but the cover is removed for the sake of easy explanation.

FIG. 4 is a plan view and a right side view of the selective activation robot 13. Key-in lever 15 in plan view
Is an L-shaped elongated metal plate, and a small cylindrical rubber 22 is fixed to the tip. Eleven are 1, 2, in order from the top
It is lined up with 3, but the odd number is short and the even number is long, and 11 solenoids 16 connected to the end are arranged in two rows,
Do not hit adjacent solenoids. The chassis 23 is a large L-shaped metal plate and has 11 vertical short sides.
The square hole is opened and the key-in lever 15 is penetrated. An intermediate support metal fitting 24 made of an L-shaped sheet metal having the same eleven square holes is made to penetrate the key-in lever 15 in the same manner, and is fixed to substantially the center of the chassis 23. Two round holes are formed in the key-in lever 15 in a section sandwiched between the intermediate support fitting 24 and the solenoid 16, and a pair of screws and a nut 25 are tightened in the left round hole in the plan view to prevent the screw from coming off. Long screw 26 and two nuts 2 in the right round hole
7 and the long screw 26 is hooked at one end of the tension spring 28. The other end of the tension spring 28 is hooked on the intermediate support fitting 24. The direction of contraction of the spring and the direction of attraction of the key-in solenoid are opposite to each other. The key-in lever 15-1 illustrated at the top in the plan view is a state in which the solenoid 16-1 is energized, the actuator is attracted, and the key-in lever 15-1 further extends and moves the tension spring 28. Lever 1
From 5-2 to 15-S, current is not supplied, but is pulled by the tension spring 28 so that the pair of screws and the nut 25 come into contact with the intermediate support fitting 24 to keep the balance.

FIG. 5 shows the door opening robot 14 and the bracket 1.
7 is a front view and a side view of FIG. The actuator of the door signal switch 19 comes into contact with the receiving portion 17b of the receiving metal fitting 17 and is pushed in when the door 5 is closed, and the door signal switch 19 is turned on. The door opening lever 18 has a J-shaped lower end, is bent in a Z-shape at the upper part of the fulcrum 20, and the terminal end thereof is connected to the door opening solenoid 21.
When the door 5 is closed, the door opening lever 18 is at the position depicted by the solid line, and when the solenoid 21 is energized, it is rotated to the position depicted by the alternate long and short dash line. In this state, the receiving metal fitting 17 also moves to the position depicted by the alternate long and short dash line.

In FIG. 6, a commercially available sequencer is used as the controller 29, and eleven solenoids 16 and a door opening solenoid 2 are used.
It is a connection diagram in which 1 and 1 are sequentially energized. LS1 and LS2
Is a limit switch, LS1 is a sequencer start switch 30, and LS2 is the door signal switch 19. TR1 to TR9 and TRA are timers,
A circle has an input part, and contact symbols include a normally open contact drawn apart from the two small circles and a normally closed contact drawn in contact with the two small circles. The timer can set the time in units of 0.1 seconds, and the normally open contact is closed and the normally closed contact is opened after a set time has passed since DC 24V was supplied to the input section. This state is maintained during energization, and when the input section is de-energized, it is reset, that is, returns to the initial state. SOL1 is the solenoid 16-1, SOL5 is the solenoid 16-5, and similarly SOL3 is the solenoid 16-1.
-3, SOLS is solenoid 16-S, and SOLO
Is a door opening solenoid 21.

Timer TR1 is 2 seconds, TR2, TR4,
TR6 and TR8 are all set to 0.5 seconds, TR3 and TR
5, TR7, and TRA were set to 1 second and TR9 was set to 2 minutes and 32 seconds as the heating time plus alpha. The sequencer itself is widely commercially available and is not shown.

FIG. 7 shows a control flow of an example in which a personal computer or a microcomputer is used as the controller 29. Existing microwave ovens, including the commercially available decompressor, control a large number of relays using a microcomputer, and the control circuit is known,
In general, a personal computer does not have a function of driving a solenoid or the like, but since a number of personal computer peripheral devices having these functions are commercially available, the description thereof will be omitted here, and only the control flow will be described in the section of action. .

FIG. 1 shows a state in which six defrosters equipped with these robots are placed close to each other on a rack 31 and the door 5 is directed to the front. The door opening / closing robot 14 is assumed to be covered with a metal case drawn by a two-dot chain line. A controller 29 and a 24V DC power source, which are provided for each of the decompressors, are housed in a metal box 32, and electrically connected to each robot. The connecting lead wire is omitted because it is complicated. The metal box 32 is provided with six starting switches 30 corresponding to each of the six decompressors 1, and 153 indicates that the keys are set to be operated in the order of 153.
A display 33 written as is provided.

The operation of the above embodiment will be described. First, the six start switches 30 are pressed to close the contacts.
Next, 9 pieces of frozen sushi are put in the heating chamber of any of the 6 defrosters, and the door 5 is closed. Since the receiving portion 17b of the receiving bracket 17 fixed to the door 5 pushes the actuator of the door signal switch 19, the door signal switch, that is, the contact of LS2 in FIG. 6 is closed. Along with this, DC24V is added to the timer TR1 and the normally open contact TR1 is closed after 2 seconds, and the normally closed contact TR is closed.
24V to SOL1, that is, solenoid 16-1 via 2
Is applied. Since the solenoid attracts the actuator, the key-in lever 15-1 connected thereto moves. Since the key-in lever 15-1 is provided at a position facing the input key of the defroster operating unit 7 and the numeral 1, the cylindrical rubber 22 fixed to the tip of the numeral 1 presses the numeral key 1 as the key is moved.

When the normally open contact TR1 is closed, the timer TR2 is energized simultaneously with SOL1.
After a few seconds, the normally closed contact TR2 opens, the SOL1, that is, the solenoid 15-1 is de-energized, and the tension spring 28 pulls the key-in lever 15-1 back to its original position. Therefore, the decompressor key has been pressed for 0.5 seconds. Normally open contact TR
2 is closed at the same time, and the timer TR3 is energized. After the setting time of 1 second, the normally open contact TR3 is closed and the timer TR4 is opened.
To the SOL5 via the normally closed contact TR3
That is, the solenoid 16-5 is also energized. The key-in lever 15-5 moves, the numeric key 5 of the decompressor operation unit is pressed, and the key returns to the original state after the set time of TR4 0.5 seconds. Thereafter, similarly, the number key 3 and then the start key are pressed and the timer TR9 is energized.

The thawing device operates in a heating pattern that ideally thaws nine frozen frozen sushi products stored in the IC card No. 153, and after 2 minutes and 30 seconds, a termination sound is emitted to finish heating. Since the timer TR9 is set to 2 minutes and 32 seconds, the normally open contact TR9 is closed 2 seconds later, and as a result, SOLO, that is, the door opening solenoid 2 is connected via the normally closed contact TRA.
1 is energized, and at the same time, the timer TRA is energized. When the actuator of the door opening solenoid 21 is attracted, the door opening lever 18 connected thereto is rotated about the fulcrum 20 to the position indicated by the one-dot chain line in FIG. Push the receiving part 17b of 17
The door 5 to which is fixed is opened. At this time, since the actuator of the door signal switch 19 returns to the original position, the door signal switch 19, that is, the contact of LS2 in FIG.
The energization of 1 is cut off, and the normally open contact TR1 is opened. As a result, the timer TR2 and the timer TR3 are sequentially advanced, and the energization is cut off to TR9 and TRA. As a result of the normally open contact of TR9 being opened, SOLO, that is, the door opening solenoid 21 is de-energized, and the actuator and the door opening lever 18 return to the position indicated by the solid line.

When the door 5 is opened, the thawed sushi is taken out, 9 pieces of frozen sushi are newly inserted, and when the door 5 is closed again, the actuator of the door signal switch 19 is pushed and the contacts are closed. The timer TR1 is energized again, and the same operation is repeated thereafter.

Next, the operation when using a personal computer will be described with reference to FIG. When a microcomputer is used, it is a little different, but since it is essentially the same, it is omitted. Start, that is, when the personal computer is started, the first step is to display an inquiry on the screen as to what key to press first. In the present embodiment, the numeral 1 is input, so 1 is input and stored as A = 1 in the memory inside the personal computer, and at the same time A = 1 is displayed on the screen. In the next step, if the numeral 5 is input as the second key to be pressed in the same procedure, B = 5, and similarly, in the next step, the third key is input and C = 3 is stored. In the next step, there is an inquiry about the heating time, 2 minutes and 30 seconds is input, and CT = 150 is stored. In the next step, an inquiry is made as to whether the settings of A = 1, B = 5, C = 3 and CT = 150 displayed on the screen are correct. If No, return to the first step, and if Yes Goes to the step waiting for the start switch. For example, a return key is applied as the activation switch. When this is pressed, it proceeds to the next step and starts the door interruption. After that, no matter which step the personal computer is executing, when the door, that is, the door 5 is opened, the contact of the door signal switch 19 is opened, and this signal causes the operation to return instantly to this step.

Next, all the solenoids are turned off, and 0 is set in the time counter in the next step. After that, the time counter keeps counting time. In the next step, it is confirmed that the door switch is closed, and if it is open, the process proceeds to the No side and returns to the step of turning off all solenoids. If it is closed, the process proceeds to the next step on the Yes side. After 2 seconds, in the next step, the solenoid with the number stored as A is turned on, and in the next step, wait another 0.5 seconds and turn off the A solenoid when the counter time reaches 2.5 seconds. Go to step. In the next step, wait another 1 second, and turn on the B solenoid when the counter reaches 3.5 seconds. Proceed in the same way, and turn off the B solenoid in 4 seconds.
The C solenoid is turned on after 4.5 seconds, the C solenoid is turned off after 5 seconds, the solenoid corresponding to the start key and the S solenoid are turned on after 6 seconds, and the S solenoid is turned off after 6.5 seconds. As a result, the defroster starts heating with the keys pressed sequentially by the solenoids A, B, and C, that is, the first, fifth, and third patterns, and finishes heating after 2 minutes and 30 seconds. Meanwhile, the personal computer waits for CT plus 8 seconds and then the time counter reaches 158 seconds. 8 minus 6.5 is 2.
Since it is 5, the time is 2.5 seconds after the end of heating of the defroster. In the next step, the D solenoid, that is, the door opening solenoid 21 is turned on, and in the next step, wait for 1 second, turn off the D solenoid, and then return to the all solenoid off step to reset the time counter to 0 again. Proceed to. The door 5 of the decompressor is opened by turning on the D solenoid for 1 second, so that frozen sushi can be put in and taken out during this period, and if the door is closed again, heating can be repeated any number of times.

Whether the control is performed by the sequencer or the method by the personal computer, the same operation is performed by both methods, during which the operator only needs to take in and out the food and subsequently close the door. The key operation to select one of them, the start key operation, and the door opening operation are all performed automatically.

As described above, a commercially available heater (defroster) 1
By providing the selective activation robot 13, the door opening robot 14 and the controller 29, the key operation is omitted, and it is possible to work without increasing the number of workers even when 6 units are used at the same time.
As shown in FIG. 1, when the doors 5 of the six heaters are directed to the front and placed on the rack 31 in a state of being close to each other, the worker can work without moving from the same place and a series of robot operations can be performed. Since the person starts from the time of closing the door 5, the worker is not chased by six robots, but works at his own pace, and the robot follows this, so polite work can be expected. .

The automation of key operations not only saves work but also prevents erroneous operations. If you press the number keys in the order of 153 and make a mistake next to the place where you should press the number keys, and you press 143, a different heating pattern will be called up, and 9 sushi may become defective. By automating this, erroneous operation could be prevented. In particular, the point of the present invention is that two types of robots are downsized and attached to respective operation targets. For example, even if the heater moves a few millimeters on the rack due to various causes, the robot is fixed to the heater itself, so that the robot can perform a correct operation. In addition, since the operation target is limited to one heater, not only the determination of the presence or absence of food described in the problem to be solved is automatically canceled, but the operation of each robot is small in a narrow range and simple. Since it is limited to simple movements, it can be configured by a combination of simple and inexpensive elements such as solenoids 16 and 21.

The purpose, significance, etc. of the present invention have been described in detail in the section of the prior art and the problem to be solved by the invention. To re-explain, for example, 9 doors are automatically closed by closing the door without using a robot. Adding a function to start the defrosting of frozen sushi can be realized by changing the program of the microcomputer installed in the defroster, and the operation is easy. However, although such a custom-made product is excellent in terms of function, it is expensive because the number of products manufactured is small. The present invention can also be said to be a technology for converting an inexpensive and high-performance popular item having a universal function into a special specification.

As the controller 29, one sequencer was used for each of the decompressors 1, but a high-performance and large-capacity sequencer has been sold in recent years, and one can control all six decompressors. Further, if a sequencer or a personal computer having a program function is used, the order of the numbers to be keyed in, 153, can be displayed on the screen at the same time as input from the keyboard, and the numbers shown in the display 33 and the key-in order can be correctly associated. The description is omitted because it becomes complicated.

Although a commercially available defroster capable of mounting 1000 heating patterns was used as the small capacity heater 1, the effect of omitting the key operation can be exhibited with other heaters.
The point is that a heater that requires key operation such as the start key is a requirement. If it is a heater that selects the heating mode with a rotary dial instead of key operation, the selection start robot will naturally have the function of rotating the dial, and it can be easily configured by using a stepping motor etc. .

The key-in lever 15 adopts a linear motion system and the door opening lever 18 adopts a rotary motion system, but this can be configured in the opposite way. Although solenoids are used as the drive units 16 and 21, they can be driven by a servomotor or the like. Although the receiving metal fitting 17 is used as a means for transmitting the movement of the door opening lever 18 to the door 5, it is not always necessary.
For example, the door opening lever 18 may directly push the door 5. Although a micro switch is drawn as the door signal switch 19, it is well known to microwave oven manufacturers that there are various methods for detecting the opening and closing of the door, and a reaction element such as light or magnetic force is used. Is also configurable.

[0035]

As described above, according to the present invention, a small-capacity, low-cost, high-performance general-purpose heater can be transformed into a special-purpose large-capacity device, and can be used without starting a key selection operation and opening a door. High efficiency, high quality microwave heating can be used in the food industry.

[Brief description of drawings]

FIG. 1 is a front view of a heating device of the present invention.

FIG. 2A is a front view of a small-capacity heating device used in an embodiment of the present invention. FIG. 2B is a plan view of the same small-capacity heating device.

FIG. 3 (a) is a front view of the small-capacity heating device with the robot attached (b) is a side view of the small-capacity heating device with the robot attached (c) small-capacity with the robot attached Top view of heating device

FIG. 4A is a plan view of a selective activation robot according to an embodiment of the present invention. FIG. 4B is a side view of the selective activation robot.

5A is a front view of a door opening robot according to an embodiment of the present invention, and FIG. 5B is a side view of the door opening robot.

FIG. 6 is a connection diagram of a sequencer of the controller of the present invention.

FIG. 7 is a program flow chart of another embodiment of the controller of the present invention.

[Explanation of symbols]

 1 Heater 5 Door 13 Selective start robot 14 Door opening robot 19 Door open / close detector (door signal switch) 29 Controller

Claims (3)

[Claims] 1. A plurality of or a single small-capacity heaters arranged close to each other with their respective doors facing forward, and a selective activation robot, a door opening robot, and a door closing detector attached to each of them. And a controller to which these robots and detectors are connected.The controller performs a predetermined selective activation operation for the selective activation robot and the door opening robot for the door after the heating end time of the heater. A heating device characterized in that the opening operation is performed for the corresponding heater every time the door is closed. 2. The heating apparatus according to claim 1, wherein a plurality of solenoids corresponding to respective keys of the heater operating section are provided as the selective activation robot. 3. The heating device according to claim 1, wherein a solenoid for opening the door and a means for transmitting to the door are provided.