Speed-compensated stacking level controller for sheet printer - introduces delay proportional to printing speed into clocking level measurements unless stack is being raised

摘要

The stack-raising motor (15) is switched on and off by separate circuits (5,16) feeding power amplifiers (13,14) via OR gates (11,12). Output from a level detector (1) is AND-gated (2) with that of a measurement clock pulse generator (3) connected to a paper/cardboard thickness selector (8) and a status memory (30). The clock generator (3) includes a gate circuit linked to a counter and a rotational speed comparator. The clocking is delayed (18,19) in dependence on speed by a number of clock periods, suppressed while the motor (15) is running with the memory (30) set to zero. ADVANTAGE - Stack height is compensated for rotational speed and sheet thickness even when the print run is interrupted.