quadruple folder
A folding machine designed principally for book
production, which produces either four 16-page or
two 32-page sections. It has three folding levels
and six sets of folding rollers. The sheet is
folded on its longest dimension in the first
section, and is folded in a parallel fold in the
second, while at the same time being slit into
four units, each of which is folded at right
angles in the third section. When insetted
sections are required, the two center sections are
conveyed to positions under the right and left
outside sections by means of hickey rolls before
the final fold is made. Here the two sections are
folded together with one operation of the right-
and left-hand folding knives, and are then
delivered to the receiving hopper as two 32-page
sections. See: FOLDING
MACHINES . (320
)
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