(57) A strapping unit (1) comprising main punch members (11a, 11b), a security punch member
(21), main die members (31a-d) forming a first and a second main jaw and security
die members (41a, 41b) forming a first and a second auxiliary jaw. The punch members
are displaceable to and fro between a retracted position and an advanced punching
position. The jaws are moveable towards and away from each other between a retracted
open position and an advanced active position, and the auxiliary jaws are moveable
in relation to the main jaws. The main die members and the main punch members are
arranged to co-operate so as to cut mutually interlocking incisions in overlapping
portions at the ends of a loop of metal strap received in the strapping unit. The
security die members and the security punch member are arranged to co-operate so as
to cut security incisions in said overlapping metal strap portions.
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