(57) A centre unit for silk-screen printing machines incorporating a loading station (20)
for the containers (3) to be printed, at least two printing stations (2) and a discharge
station (21) for the printed containers, said at least four stations being angularly
equidistant along a circular path, tangential to which the printing station screens
(22) slide and along which, with stepwise movements of an angular width equal to the
width by which said stations are distributed, there rotate an equal number of radial
mandrels (5, 51) which support the containers by virtue of a vacuum created within
them, comprises, associated with each mandrel (5, 51) a pair of identical parallel
guides (61) to be arranged symmetrical about and parallel to the longitudinal axis
of said mandrel (5, 51) and projecting beyond the front end (51) of this latter where
they support a slider (6) provided centrally with an interchangeable rotatable support
(151) aligned with the respective mandrel and caused to slide with forward and backward
movement by a lateral pneumatic unit (7).
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