Load measuring device in cooking apparatus, and control method thereof

A cooking device, comprising:

• a cavity including an opening;
• a tray disposed to place a cooking ingredient on an upper surface of the tray inside the cavity;
• a support plate facing the tray and under the tray, and having a first coupling portion having a lower opening toward a bottom of the cavity in a lower surface of the support plate;
• a plurality of rollers in rolling contact between the tray and the support plate;
• a roller guide horizontally extending from a rotation shaft positioned in a substantial center of the tray and configured to allow the plurality of rollers to rotate along a predetermined concentric circle;
• a guide injection-molded article having a second coupling portion with an upper opening and a predetermined length on an upper surface of a plate with a predetermined thickness, formed so that open surfaces of the second coupling portion and the first coupling portion are disposed to face each other on a vertical axis;
• an elastic member having an upper end portion fitted into the first coupling portion and a lower end portion fitted over the second coupling portion;
• and
• a load cell having the guide injection-molded article on an upper surface thereof so that a lower surface of the guide injection-molded article contacts the upper surface of the load cell, and configured to generate an electrical signal according to a load transferred through the support plate, the elastic member and the guide injection-molded article.