Electronic control timer for a microwave oven

Details Electronic control timer for a microwave oven Electronic control timer for a microwave oven

1996-06-03

1999-04-20

Leung, Philip H.

Electric heating

Microwave heating

With control system

200 38FA, 219702, 368 10, H05B 668

Patent

active

058956000

ABSTRACT:
An electronic control timer of microwave oven capable of establishing a total cooking period by different time units is disclosed. The electronic control timer includes a gear having a first gear segment and a second gear segment. A switch installed adjacently to the gear generates a pulse signal in accordance with a rotation displacement of the gear. The gear driving device is activated when the switch is activated, and then rotates the gear in an opposite direction to an initial rotating directioon of the gear and returns the gear to an initial state thereof. The first gear segment includes a first gear teeth having a first gear pitch corresponding to a first time unit and a second gear teeth having a second gear pitch corresponding to a second time unit. The second gear segment has a toothless shape. The switch is activated when it is brought into contact with the first gear segment so that the switch generates the pulse signal. And, the switch is not activated when it is brought into contact with the second gear segment.

REFERENCES:
patent: 4287583 (1981-09-01), Strachan et al.
patent: 4420669 (1983-12-01), Scalf et al.
patent: 4523062 (1985-06-01), Mahon
patent: 4600826 (1986-07-01), Ishimura
patent: 5097105 (1992-03-01), Boin et al.
patent: 5107088 (1992-04-01), Aoki
patent: 5134262 (1992-07-01), Lee

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