JPH10300100A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem attended with use of thermostat in an oven toaster or the like, improve safety of this heating cooker and further improve a heating efficiency. SOLUTION: This heating cooker comprises a heater 10, a thermostat 9 for turning ON/OFF the heater 10, a human detecting sensor 8, and a control section 6 for changing-over a first operation using the thermostat 9 as an operation input is carried out and a second operation not using the thermostat 9 and turning ON the heater 19 only when a human detecting signal from the human detecting sensor 8 is attained during the second operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safe structure for heating a cooking device such as an oven toaster.

[0002]

2. Description of the Related Art For example, in an oven toaster, a thermostat is incorporated in a heater coil in series, and in a case of an overheating state in which a heating temperature exceeds a set temperature, the heater coil is automatically turned off by operating the thermostat. The safety of the cooking device is ensured.

[0003]

However, if the thermostat is out of order, the heater is not turned off.
There is a fundamental problem that safety cannot be ensured.

[0004] Furthermore, when the heater is turned off by the operation of the thermostat, the thermostat does not return unless the temperature is lowered to some extent, and the heater is not turned on accordingly, so that the heating efficiency is reduced. This problem is remarkable in commercial oven toasters used in restaurants and convenience stores. In other words, when a large number of customers heat toasts, lunch boxes and the like one after another, the heating operation cannot be performed efficiently because the heating chamber cannot always be kept at a high temperature.

[0005] The present invention solves the problems associated with the use of thermostats such as oven toasters and the like, and achieves greater safety.
And it was performed so as to improve the heating efficiency of the cooking device.

[0006]

According to the first aspect of the present invention, a main body, a heating element for heating a heating chamber provided in the main body, and detecting that the temperature in the heating chamber has reached a predetermined temperature. And a thermostat that reduces the heating output from ON to OFF or from ON to the heating element, and is provided on the main body,
A human detection sensor for detecting the presence or absence of a person in front of the main body,
A heating cooker comprising: a control unit that keeps the ON state of the heating body in preference to the thermostat only when a human detection is performed by the human detection sensor.

[0007] According to the above configuration, when there is no person around the cooking device, safety is ensured by turning off the heating element, and safety is ensured even when the thermostat fails.

According to the second aspect of the present invention, the main body, the heating body for heating the heating chamber provided in the main body, and the fact that the temperature in the heating chamber has reached a predetermined temperature, the heating body is turned from ON to OF.
A thermostat that reduces the heating output from F or ON, a human detection sensor that is provided on the main body and detects the presence or absence of a person in front of the main body, and a first operation and a thermostat using the thermostat in accordance with an operation input. Switching means for switching the operation to a second operation using a human sensor without using the same; and a control unit for turning on the heating element only when a human sensor signal from the human sensor is obtained during the second operation. A heating cooker comprising:

According to the above configuration, the operation is switched between the first operation using the thermostat and the second operation not using the thermostat in accordance with the operation input, and during the second operation in which the thermostat is not used, the human operation is performed. The heating element is ON only when a human detection signal from the sensor is obtained
Is done.

That is, in the second operation, on the one hand, the heating element is not turned off by the operation of the thermostat, so that the operation efficiency of the heater is improved. When there is no person, the heating element is turned off, so that safety is ensured.

The above-described heating device can be suitably implemented as an oven toaster or the like.

[0012]

FIG. 1 is an external perspective view of a commercial oven toaster as a heating cooker according to the present invention. A door 2 is attached to the front of the oven toaster 1 and an operation surface 3 is provided at a side position thereof. A display unit 4 is provided above the operation surface 3, and a control unit 6 including a microcomputer and various electric components is mounted in a main body 5 of the oven toaster 1 which is a back surface of the operation surface 3. A rotary operation type operation body 7 is arranged below the display unit 4. As shown in FIG. 2, the operating tool 7 can be switched to the “ON continuation”, “OFF”, and “timer” positions. A human detection sensor 8 for detecting the presence of a person in front of the main body 5 is disposed below the operation body 7. The human detection sensor 8 is composed of an infrared sensor, and detects an infrared ray emitted by a human to output a human detection signal.

FIG. 3 is a block diagram showing a circuit configuration of the oven toaster 1. As shown in FIG. The control unit 6 is connected with a heating heater 10 in addition to the display unit 4, the operating tool 7, and the human detection sensor 8 described above. The control unit 6 stores the data in response to an input signal from the thermostat 9 for detecting a predetermined temperature of the operating body 7, the human sensor 8 and the heating chamber (a temperature at which a problem occurs if the temperature of the heating chamber further rises). The operation of the display unit 4 and the heater 10 serving as a heating element is controlled via the driving unit 11 based on the program to be performed. The control unit 6 has a timer function. The heater 10 has first and second relay contact switches connected to an upper and lower coil as a heating element so that an AC 100 V power supply is connected to the upper and lower coils and connected in series with the upper and lower heater coils and in parallel with each other. Reference numerals 12 and 13 are provided, and a third relay contact 14 is connected to the first relay contact 12 in series. Each of the relay contacts 12, 13, and 14 is switched by a relay coil of the driving means 11 according to a signal from the control unit 6.

First and second relay contact switches 12, 13
Is activated by signals from the operating body 7 and the human detection sensor 8.
The third relay contact 14 is activated by a signal when the thermostat 24 detects a predetermined temperature of the heating chamber. With the above-described configuration, an operation control signal is given from the control unit 6 to the heater 10 so that the first and second relay contacts 1
The relay coils corresponding to 2 and 13 are driven. When the first and second relay contacts 12 and 13 are turned on, the heater 10 is actuated. When the first relay contact 12 is turned on, the heater 10 is turned on. Thermostat 9 is turned off
Then, the third relay contact 14 is turned off, and the operation of the heater 10 is stopped.

FIG. 4 is a flowchart showing the heating operation. When the operating body 7 is operated and the driving operation is performed in use, first, the operation command contents “human detection”, “ON continuation”, and “timer” are determined (steps 1 and 2). Then, the operation contents determined on the display unit 4 are displayed (steps 3, 4, and 5). That is,
In the human sensing operation (second operation), the second relay contact 13 is turned on, so that the first relay contact 12 is turned on in both the ON continuous operation and the timer operation (first operation). Then, heating is performed. Then, in the human sensing operation, if there is a human near the front of the main body 5 and there is a sensing signal from the human sensing sensor 8, the heater 10 is turned on by a command from the control unit 6 (steps 6, 7, 8). At this time, since the thermostat 9 is not in the connected state, the heater 10 is not turned off by its operation. When the heater is overheated during the ON continuous operation or the timer operation, the thermostat 9 is turned off to turn off the heater 10 (steps 10, 12, 15, 17). Further, when the temperature is lowered to some extent from the overheated state by turning off the heater, the thermostat 9 is returned and turned on, so that the heater 10 is also turned on. (Steps 10, 11, 15, 16).

In the human sensing operation and the continuous ON operation, the heater 10 is turned off by turning the operating body 7 "OFF" (steps 9, 11, and 19). It is turned off (steps 18 and 19). As described above, the heater 1 is operated in a manner that the thermostat 9 is not used in the human sensing operation.
0, the heater 10 is not turned off due to the thermostat 9 being turned off.
Of the heating efficiency is avoided. Thereby, heating cooking can be performed efficiently one after another. Further, even in a configuration in which the thermostat 9 is not used, if there is no person in front of the main body 5 and a sensing signal cannot be obtained, the heater 10 is automatically turned off.
Because FF is performed, safety is also ensured.

FIG. 5 shows a circuit configuration of the second embodiment.
A thermostat 9 and a human detection sensor 8 are connected in series to a heater 10 via a changeover switch 15 that is switched by an operating tool 7. The changeover switch 15 is a timer 15
T is provided integrally.

FIG. 6 shows a circuit diagram of the third embodiment. 10
Is a heater, and a switch 8a integrating a thermostat 9 and a human sensor 8 is connected to the heater 10 in series. Reference numeral 16 denotes a power switch.

With the above configuration, even if the thermostat 9 is out of order, if there is no person, the heater 1 will not work.
Zero can be automatically turned off to improve security.

[0020]

According to the present invention, the problems associated with the use of a thermostat in an oven toaster or the like are eliminated, the safety of the cooking device is improved, and the heating efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an embodiment of an oven toaster.

FIG. 2 is a front view of an operation body.

FIG. 3 is a simplified circuit diagram of an embodiment of an oven toaster.

FIG. 4 is a flowchart for explaining the operation.

FIG. 5 is a circuit diagram according to a second embodiment;

FIG. 6 is a circuit diagram according to a third embodiment;

[Explanation of symbols]

 Control unit Operation body Human detection sensor Thermostat Heater

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masaaki Orikan 1-chome, Shoda-cho, Seika-cho, Soraku-gun, Kyoto Sanyo Home Tech Co., Ltd.

Claims (3)

[Claims] 1. A heating element for heating a main body, a heating chamber provided in the main body, and detecting that the temperature in the heating chamber has reached a predetermined temperature, and turning off the heating element from ON to ON or decreasing the heating output from ON. A thermostat to be provided on the main body,
A human detection sensor for detecting the presence or absence of a person in front of the main body,
A heating cooker comprising: a control unit that keeps the ON state of the heating body continued in preference to the thermostat only when human detection is performed by the human detection sensor. 2. A heating element for heating a main body, a heating chamber provided in the main body, and detecting that the temperature in the heating chamber has reached a predetermined temperature, and turning off the heating element from ON to ON or reducing the heating output from ON. A thermostat to be provided on the main body,
A human detection sensor for detecting the presence or absence of a person in front of the main body,
Switching means for switching the operation between a first operation using a thermostat and a second operation using a human sensor without using the thermostat in accordance with an operation input, and a switch from the human sensor during the second operation. A heating cooker comprising: a control unit that turns on a heating element only when a human detection signal is obtained. 3. The cooking device according to claim 2, wherein a timer function is activated when the first operation is switched to the first operation by an operation input.