an automatically cooling iron has : a housing with an electric heating plate on the bottom , a fan inside of the housing , a motion status detector and an automatic switch circuit . the motion status detector is a ball switch providing three kinds of status information : statically and horizontally placing / statically and vertically standing / motion . the automatic switch circuit has a heating switch , a fan switch and a microprocessor . the microprocessor calculates horizontally placing time or vertical standing time according to the information of statically and horizontally placing / statically and vertically standing / motion provided by said ball switch , and if the horizontally placing time or vertical standing time reaches a predetermined value , the microprocessor controls the heating switch to cut off power to the electric heating plate and controls the fan switch to turn on the fan .