PURPOSE: To improve the operability of the food heating device of the type that a key input is carried out by punched cards by constituting a control circuit in which, even if a card detection key and a selection key are operated in a wrong order, the wrong-ordered operation is regarded as a normal operation as far as it is within a predetermined time period.
CONSTITUTION: In the food heating device in which the heating is controlled by mounting an pierced card having heating mode selection hole train 1-1 and heating time setting hole train 1-2 on a card holder, selection keys 2 to be operated by the depression of the card 1 are arranged on the operation panel side. The keys 2 are a function key 2-f, card detection key 2-c, automatic take- in key 2-s for giving a take-in timing of information the card 1 has to a control circuit, and parity key 2-p. In this instance, the control circuit is so constructed that, even when the card detection key 2-c and function key 2-f are operated in the wrong order, the wrong-ordered operation is regarded as a normal one as far as it is within the predetermined time period.
WATANABE ICHIROU
HOTSUTA KOUICHI
SAKURAI OSAMU
