A seismic isolation bearing comprises a lower plate, an upper plate, and a cylindrical roller in rolling contact with an upwardly facing, bearing surface of the lower plate and a downwardly facing surface of the upper plate. In order to avoid waste and operational malfunctions, the controls provide the feeders located downstream from a first feeder with a law of motion which is dependent on the format of the folded sheets. The contained photons stimulate further photons emissions, which depopulates energy levels involved in the amplification process. A CMOS comparator with a 10 nanosecond rise time converts the analog signal to a binary one.