Figure 12-4.—A laser printer paper feed.
paper is picked up. The registration rollers align the
paper so that it is straight. The registration rollers feed
the paper to the transfer roller. The transfer roller
presses the paper against the drum to transfer the toner
from the drum to the paper. The paper then passes
through the fusing rollers. The fusing rollers are heated
rollers that melt the toner to the paper. The paper is then
fed to the paper output tray.
POWER SUPPLY
All printers have a power supply to provide the
proper operating voltages for the printer. The output
voltages and current of the power supply depend on the
type of printer.
TOPIC 3—IMPACT PRINTERS
Impact printers form characters on the paper by
striking a device against an inked ribbon and into the
paper, causing a character to be imprinted on a sheet of
paper. Common impact printers include the following:
Drum printers
Band printers
Dot matrix printers
Daisy wheel printers
Impact printers can be line printers or character
printers.
LINE PRINTERS
Line printers receive data to be printed from the
computer and store the data until a complete line is
ready to be printed. The line printer will print several
characters at a time. The types of impact line printers
commonly used in the Navy are the drum, chain, and
band printers.
Drum Printers
In a drum printer, the character set is inscribed as
raised fonts on a hollow metal drum. These raised
characters are formed into lines or bands on the drum.
Figure 12-5 shows atypical print drum. All the A’s are
on one line, all the B’s are on the next line, and so forth,
until all the characters in the set form a line each. The
character set is repeated for each column that the printer
Figure 12-5.—A print drum showing character lines.
12-7
