(57) The machine comprises a supporting structure (2) to which are attached an approximately
vertical-axis cage (12) for stacking signatures, and conveyor means (3) arranged to
receive a continuous stream of signatures and feed these signatures to the stacking
cage (12). Two platforms (18, 19) located one above the other, are movable axially
relative to the stacking cage (12), the upper platform (18) (blade) being intended
to receive the signatures fed to the stacking cage (12) and being lowerable as the
signatures are stacked thereon, towards the lower platform (19) in synchronism with
the feed movement of the signatures. The upper platform (18) can then be withdrawn
from the stacking cage (12) to transfer the pile of signatures formed thereon onto
the lower platform (19). Above the stacking cage (12) is a guide element for the signatures
(26), this guide element (26) being at least partially movable relative to the structure
(2) in the direction of stacking of the signatures themselves. The arrangement is
such that the guide element (26) is kept constantly in a position of substantial contact
with the last signature fed to the cage (12), its position being varied as a result
of momentary variations in the speed of stacking of the signatures in order to prevent
jamming of the signatures themselves.
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