Work principle of manual coffee grinder

Work principle of manual coffee grinder-------

The hand crank has a chainring,there is another fixed groove on the periphery of the chainring,Rotate the handle and the coffee beans fall into the groove and are crushed by the gear plate.Fall into the metal sprocket that rotates with the handle and grind,Concentrated in the bottom drawer, pull out the drawer after grinding, the coffee powder is full and the aroma is overflowing!