PURPOSE: To enable obtaining of a processed food material in a large amount by lowering a trapezoidal screw rod to which rotation is transmitted from a motor and pressing the material for processing a food such as a packaged bag charged to a housing.

CONSTITUTION: A processing material is inserted from a door (1b) of a housing 1 and a motor 2 is then normally rotated to rotate a driven pulley 5 through a motor pulley 3 and a belt 4. A trapezoidal screw rod 6 connected to an engaging part of the pulley 5 is subjected to lowering motion to press the processing material. The electric motor 2 is then reversely rotated to lift the trapezoidal rod 6. The processed material is subsequently taken out of the door (1b).