Devices for resetting positions of grinding wheels in grinders

A grinder for grinding beans of plant-based products and generating a ground powder, the grinder comprising:

• a grinding chamber;
• a wheel motor having a shaft defining an axial direction;
• a rotating grinding wheel and a stationary grinding wheel housed in the grinding chamber, wherein the rotating grinding wheel is connected to the shaft of the wheel motor and is configured to rotate around the axial direction, and wherein the stationary grinding wheel is stationary against rotation and is configured to axially move in both ways in the axial direction;
• and
• a device for resetting position of the rotating grinding wheel and the stationary grinding wheel;
• wherein the device comprises:
• a mechanism for axially moving the stationary grinding wheel;
• an electric motor, coupled to the mechanism, for actuating the mechanism;
• and
• means for stopping the electric motor as soon as a contact state is detected between the stationary grinding wheel and the rotating grinding wheel, wherein the means comprises a current intensity meter for measuring current intensity absorbed by the electric motor and a switch for cutting off power to the electric motor upon detection of a value of the current intensity absorbed by the electric motor representative of a zero-distance state between the stationary grinding wheel and the rotating grinding wheel.