Compensating for Supply Voltage and Band Speed Instability to Prevent Inaccurate Type Printing in Line Printers
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19
This article relates to a compensation concept for supply voltage or band speed instability occurring when several hammers are fired in band line printers with precalculated hammer firing times. If several print hammers of a line printer are fired simultaneously or in an overlapped fashion, the supply voltage drops, unless there is an ideal constant voltage source, and the band speed declines temporarily. The supply voltage drop adversely affects the hammer flight time, whereas the drop in the band speed leads to inaccurate type printing. These phenomena may be empirically determined as a function of the number of hammers fired within a time unit.