Patent attributes
A sensor detects the presence of an upper cup in a pair of cups, between which pills are crushed by machine. Operation of the crushing machine is prevented if the upper cup is absent, and enabled if the upper cup is present. The sensor may be a photodiode that is sensitive to a beam of laser light that is directed over the lower cup. The beam passes when the upper cup is absent and is blocked by the upper cup when present. An optional sensor may be included to detect whether the drawer containing the cups and pills is closed, which is used as a further condition that must be satisfied before crushing can be started. Also, an interlock can be included to prevent the drawer from opening during the crushing process. By ensuring the presence of the upper cup, the escape of powdered medication can be prevented.
