Coffee extracting apparatus

A coffee extraction apparatus comprising:

• a first burr configured to rotate to grind supplied whole beans;
• a first burr through-hole defined in the first burr in an axial direction of the first burr;
• a first burr inlet disposed at a first end of the first burr through-hole to allow the whole beans to be introduced into the first burr;
• a first burr outlet disposed at a second end of the first burr through-hole opposite to the first end of the first burr through-hole to discharge coffee powder;
• a second burr inserted into the first burr through-hole through the first burr outlet to define a grinding space for grinding of the whole beans with the first burr;
• a burr coupler coupled to the second burr to move the second burr in the axial direction of the first burr;
• a first rotary part coupled to an outer surface of the first burr to rotate the first burr;
• a second rotary part that is connected to the burr coupler and a second gear part, the second gear part being configured to be rotated by a second power part;
• an extractor that defines an opening to receive the coffee powder discharged through the first burr outlet and that is configured to mix the coffee powder with water to extract coffee liquid;
• and
• a water supplier configured to supply water to the extractor,
• wherein the second rotary part comprises:
• a rotating ring rotatably connected to the second gear part, and
• a cylindrical guide that passes through the rotating ring and is coupled to the burr coupler, and
• wherein, based on the rotating ring being rotated, the cylindrical guide is configured to move in the axial direction of the first burr to thereby move the burr coupler in the axial direction of the first burr and adjust a depth of insertion of the second burr into the first burr.