Abstract: An apparatus for grinding coffee beans, enabling a size of coffee bean grinds to be easily controlled, is disclosed. The apparatus includes a rotating cutter having grinding blades at its upper surface, and rotated by a motor, a fixed cutter positioned above the rotating cutter with a spacing therebetween, and having grinding blades at its lower surface and a central charging inlet formed therethrough, a worm wheel connected to the fixed cutter to raise and lower the fixed cutter, a worm gear engaged with teeth of worm wheel to rotate the worm wheel, and a control motor to rotate the worm gear in normal and reverse directions.

Abstract: A coffee extracting apparatus for a coffee machine, which allows easy extraction of coffee liquid and easy removal of coffee grinds, is disclosed. The coffee extracting apparatus includes a machine case, a hopper receiving coffee grinds, a cylinder unit disposed below the hopper and rotated within a certain angle range, a upper piston movably inserted in the cylinder unit and having a hot water path therein, a lower piston inserted in the cylinder unit to press coffee grinds against the upper piston and having coffee discharge paths therein, cam and link members to guide movement of the cylinder, the upper piston and the lower piston, and a drive unit mounted on the machine case to supply driving force to the cam members. The coffee extracting apparatus is easily removed from the coffee machine. A unit amount of coffee liquid is extracted every revolution of the drive unit.