Definition of a Paper is a thin
material produced by the combination of fibers, such as vegetable
fibers composed of cellulose, which are subsequently held together
by chemical method of hydrogen bonding.
In printing, paper handling specifies the methods
used to transport paper through the printer. There are two classical
techniques for trans-port ing paper through a printer: tractor feed
and friction feed. The tractor feed is the most widely accepted
type of mechanism for use in general purpose or high volume printing,
especially for impact dot-matrix printers, but friction feed is
quickly growing in popularity for single sheet 'letter-quality"
printers, such as Inkjet printers.
The tractor feed technique uses a continuous length
of folded paper with holes evenly perforated along both sides. This
paper is threaded into the paper transport, and inserted into sprocket
wheels located just over the platen. Teeth on each sprocket wheel
mesh exactly with holes in the paper. The platen and sprocket wheels
are linked mechanically, so as the platen is advanced, both sprockets
turn to pull paper through evenly.
The friction-feed technique is effective for single
sheets of paper though ink jet printers might require specialized
ink jet paper for test results. A sheet is started into the mechanism,
then locked down against the platen using one or more pressure (or
"pinch") rollers. Paper is now fixed in place. As the
platen advances, friction between the platen and pinch rollers literally
push the paper along.
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