Weight controlled grinder and weight sensor

A weight sensor in combination with a coffee grinding apparatus comprising:

• a grinding mechanism for grinding coffee beans placed therein;
• means for dispensing beans to the grinding mechanism;
• means for selecting a weight of ground coffee for grinding by said grinding mechanism, said selecting means producing a first signal corresponding to the selected weight of coffee to be ground;
• a receptacle operatively associated with said grinding apparatus for receiving ground coffee from the grinding mechanism;
• said weight sensor being operatively associated with said receptacle for sensing the weight of ground coffee collected in said receptacle and producing a second signal corresponding to the weight of the ground coffee, said weight sensor having a hollow housing and a cover, said hollow housing and cover defining a cavity, said cavity retaining an incompressible liquid, a flexible diaphragm retained between said cover and housing in said cavity and being operatively associated with said incompressible liquid, a contact body positioned between said cover and said diaphragm, a first portion of said contact body abutting said diaphragm and a second portion of said contact body extending through said cover, forces applied to said second portion of said contact body being transferred to said incompressible liquid, and an electronic pressure sensing device operatively associated with said incompressible liquid, forces corresponding to weight to be sensed transferred through said incompressible liquid being sensed by said pressure sensing device, said pressure sensing device generating an analog signal proportional to the force applied to said contact body;
• a control circuit coupled to said dispensing means, said selecting means and said weight sensor, said control circuit controlling said dispensing means as a function of a comparison of said second signal received from the weight sensor and said first signal, said control circuit controlling said dispensing means for decreasing the rate at which coffee beans are dispensed into said grinding mechanism as said first and second signals approach parity.