A trim hold down box apparatus is disclosed for assisting in the separation
of trim cut from an edge of a sheet by a cutter prior to the sheet being
transferred from a forming wire of a forming section to a press section of
a paper making machine. The apparatus includes a frame which is adjustably
secured to the former and is disposed downstream relative to the cutter. A
box cradle is secured to the frame and a trim box is movably connected to
the box cradle such that floating of the trim box with the forming wire is
permitted. The arrangement is such that the forming wire is disposed
between the trim and the trim box. A biasing arrangement extends between
the trim box and the box cradle so that biasing of the trim box relative
to the forming wire is permitted. The trim box has a first and a second
end and the first end of the trim box is connected to a source of partial
vacuum. The second end of the trim box cooperates with the forming wire
and is disposed in a vicinity of the trim. The arrangement is such that
when the first end of the trim box is connected to the source of partial
vacuum, separation of the trim from the sheet being transferred into the
press section is assisted by the partial vacuum applied to the trim at the
second end of the trim box.
