Method of Checking Print Band Velocity
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Print band velocity must be maintained within preset limits to insure good print quality. The method determines if the band speed is within the allowable velocity limits, and forces speed checks if the speed is out of tolerance. The method uses a microprocessor and speed check logic which is programmable for operation over a wide range of speeds. As seen in the data flow diagram of Fig. 1, the system for checking print band velocity comprises microprocessor (MPU) 10 and speed check logic 11. Timing marks on type band 12 are sensed by transducer 13. Emitter pulses produced by transducer 13 are supplied through amplifier 14 and phase-locked oscillator 15 which generates pulses indicative of the velocity of band 12. Timing is provided by system clock 16 that is common to MPU 10 and check logic 11.