(57) A seaming module for sheets comprises a first folding pre-seaming blade (14) adapted
to carry out a first bending of an angle of the order of 45°, of an already square
folded fin (L) of a sheet element to be seamed (W1). The first folding blade (14)
oscillates about a first axis (A1). A second seaming folding blade (16), which is
adapted to carry out a second final bending of the fin (L), oscillates about a second
axis (A2) parallel to the first axis (A1), and is movable between a rest position
and a working position along a path which is perpendicular to a surface (11) for supporting
the sheet element (W1), in proximity of the working position. Respective cyclical
movements are applied to the folding blades (14, 16), which are synchronized between
their rest and working positions, by control means comprising a first linkage (36)
associated to the first folding blade (14) and a second linkage (38) associated to
the second folding blade (16), which receive the motion from the rotary shaft (28)
of a source of motion (24).
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