duplex book trimmer
A type of cutting machine having two trimming
knives parallel to each other on opposite sides
above a central cutting table. The table consists
of a cutting block equipped to clamp the pile
firmly. Two piles of books, each 5 to 6 inches
high, are placed spine to spine against the
gauges. This brings the fore edges of each pile on
opposite sides at the table and under the knives.
After cutting the fore edges, the other edges of
the book are brought into position by giving the
table a quarter turn. This also changes the
position of the knives on the knife-bars above,
drawing them closer for trimming the heads and
tails of both piles simultaneously. See also: THREE-KNIFE TRIMMER .