Automatic ice making machine

An automatic ice making machine having an ice making section equipped with an evaporator connected to a freezing system, a water feed system for feeding water to be frozen to said ice making section and an ice releasing unit for releasing ice cake formed in said ice making section, said ice making machine be characterized in that it comprises:

• a temperature detector in which a preset abnormality temperature is set which is higher than0.degree. C., said temperature detector detecting a temperature of the water to be frozen that circulates in said water feed system and having a normally-closed contact which opens when the temperature of said water to be frozen drops below said preset abnormality temperature and closes when a temperature of said water to be frozen exceeds said preset abnormality temperature;
• a timer provided with a normally-opened contact which is serially connected with said normally-closed contact of said temperature detector, an operation time of said timer being set to be longer than a time period which is necessary for the water to be frozen becomes 0.degree. C. after the ice making operation of said ice making section has started and when such a set time is counted up, said normally-opened contact is closed for a predetermined time period and then reopened;
• a relay connected between power supply lines through said normally-closed contact of said temperature detector and said normally-opened contact of said timer, said relay having a normally-closed contact provided in said power supply line which is connected to said freezing system;
• and
• wherein if, at the item that said timer is counted up and said normally-opened contact is closed, said water temperature is above said preset abnormality temperature and said normally-closed contact of said temperature detector is closed, said relay is energized so that said normally-closed contract of said relay is opened and operation of said freezing system is stopped