초록 ▼

A sensing device comprised of a sensing circuit which changes its operating characteristics when an object comes near it. The sensing circuit produces a change in output voltage proportional to the change in relative distance between the sensing circuit and an object. The actual output voltage is a

A sensing device comprised of a sensing circuit which changes its operating characteristics when an object comes near it. The sensing circuit produces a change in output voltage proportional to the change in relative distance between the sensing circuit and an object. The actual output voltage is a function of both target distance and control circuit input voltage. The control circuit includes a comparator for comparing the steady state output voltage to a reference voltage and adjustment system for adjusting the input voltage to change the steady state output voltage such that the steady state output voltage approximately equals the reference voltage. The control circuit reacts only to reductions in the steady state output voltage, indicative of mechanical wear, and not to increases in output voltage, indicative of currency thickness measurement.

대표청구항 ▼

An apparatus for indicating the thickness of one or more sheets moving along a sheet path comprising: a first surface positioned to engage sheets moving along said sheet path, said first surface having a first position corresponding to the absence of a sheet, and being movable from said first positi

An apparatus for indicating the thickness of one or more sheets moving along a sheet path comprising: a first surface positioned to engage sheets moving along said sheet path, said first surface having a first position corresponding to the absence of a sheet, and being movable from said first position upon engagement with a sheet; a second surface responsive to movement of said first surface, said second surface movable from a rest position, corresponding to the first position, to a sensing position, said second surface exhibiting a displacement from said rest position indicative of movement of said first surface from said first position; signal generating means generating electrical signals related to the displacement of said second surface from said rest position, said signal generating means providing a reference signal output when said second surface is at said rest position; and a control circuit connected to said signal generating means to electrically modify said generating means to maintain said reference signal output, as the rest position of said second surface changes as a result of mechanical wear of said first surface.