Electric heating – Heating devices – With current connection and/or disconnection means
Patent
1985-12-23
1987-10-27
Leung, Philip H.
Electric heating
Heating devices
With current connection and/or disconnection means
219 1055B, 219 1055F, 99325, 177210FP, 177245, H05B 668
Patent
active
047031514
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cooking appliance which measures the weight of food which is an object to be heated and thereby enables automatic calculation of the heating time, output, pattern, etc. in accordance with the measured weight.
BACKGROUND ART
When cooking food by heating it with a general cooking appliance, the food is weighed by a balance or the like, and, based on the measured weight, the heating time and the heating output are preset by the use of a rotary timer or output setting keys and so forth. This requires troublesome operations such as, particularly, weighing, setting of the timer and the heating output, etc. before starting the cooking operation and therefore an improvement which will permit easier operation has been desired.
Further, recently, there have been developed automatic cooking appliances equipped with an infrared ray sensor for detecting the surface temperature of the food and a humidity sensor and a gas sensor for detecting water vapor, alcohol, etc. produced from the food to detect the heating condition and the cooked state of the food, thereby effecting automatic cooking. However, with such an automatic cooking appliance, the sensors detect mainly the heating condition of the surface of the food. For this reason, the cooking condition varies depending on the weight of the food, and, especially when the food occupies a large volume, there occurs a great difference in the temperature between the center portion and the surface of the food, thereby giving rise to a variation in the cooked state of such food.
Improvements in this respect have been necessary, and, to serve this purpose, automatic measurement of the weight of the food has been desired
The invention (Japanese patent application No. 44286 of 1982), which the present inventor made to attain the aforementioned purpose, was directed to a high frequency heating device in which vibrating means using a spring is provided on a turntable which rotates with food placed thereon, and the weight of the food is detected by transmitting the vibration of the vibrating means to the outside of the heating chamber by means of magnetic coupling so that, in accordance with the weight of the food thus detected, the output from the high frequency oscillator and the heating mode and the heating time are controlled. However, it was necessary to improve the above-mentioned device to elevate its performance.
DISCLOSURE OF THE INVENTION
In view of this background, this invention provides a heating cooking appliance for effecting automatic measurement of the weight of food and besides for realizing the means therefor inside the heating chamber. Further, by transmitting the weight information to the outside of the heating chamber contactlessly, this invention intends to eliminate any particular protrusion or hole in the heating chamber for use in the transmission of the weight information and to promote the operability and ease of using the heating cooking appliance
Thus, the cooking appliance of this invention comprises a heating chamber for accommodating the food, a heat source for supplying heating energy to the interior of the aforementioned heating chamber, a turntable having a Roberval mechanism whose vibration frequency varies depending on the weight of the food, and a circuit for calculating the weight of the food to be heated from the vibration frequency of the turntable which has been transmitted to the outside of the heating chamber through magnetic coupling. For the transmission of the vibration frequency through magnetic coupling, a magnet and a yoke made of a ferromagnetic material are used, and a coil is provided in a detecting section, and a portion of the heating chamber above the coil at the center of the heating chamber is protruded so that the coupling between the coil and the magnet and yoke may be tightened, thereby ensuring accurate detection of the vibration signal. A transformer or motor may generate magnetism during the heating operation, so that the energization of such a device is stopp
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patent: 3545555 (1970-12-01), Cass
patent: 3662845 (1972-05-01), Pratt
patent: 4212361 (1980-07-01), Stocker
patent: 4276468 (1981-06-01), Nagamoto et al.
patent: 4354563 (1982-10-01), Luchinger et al.
patent: 4418774 (1983-04-01), Whitney et al.
patent: 4478303 (1984-10-01), Boyles
patent: 4507531 (1985-01-01), Teich et al.
Leung Philip H.
Matsushita Electric - Industrial Co., Ltd.
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