Patent ID: 7685798

Claim:
A unit ( 1 ) for producing blister packs ( 7 ) by cutting a blister band ( 4 ), the unit having conveying means ( 3 ) for feeding a band ( 4 ) having blisters ( 2 ) containing products, in a selected feeding direction (A) through subsequent stations for verifying said band ( 4 ), for closing said band ( 4 ) with a covering band, and to a cutting station ( 5 ), where the closed blister band ( 4 ) is cut; the unit further comprising: cutting means ( 30 ) situated in said cutting station ( 5 ) and acting on said closed blister band ( 4 ) to progressively shear said band so as to obtain blister packs ( 7 ) detached from at least one strip ( 9 a , 9 b ) or from at least one longitudinal edge of said blister band ( 4 ); the cutting means ( 30 ) having at least one primary cutting section ( 34 ) and at least one secondary section ( 35 ); means for detecting if portions of said blister band ( 4 ) are faulty in a control station, said secondary cutting station ( 35 ) being made ineffective, so as to prevent detachment of the faulty blister packs ( 8 ), said faulty blister packs being destined to be rejected from said strip ( 9 a , 9 b ) of said band ( 4 ); said cutting means ( 30 ) including punch means ( 32 ), which move with a reciprocating motion to and from motionless die means ( 38 ) in a direction substantially transversal to said feeding direction (A), in order to cut said band ( 4 ); said punch means ( 32 ) having said primary cutting section ( 34 ) and said secondary cutting section ( 35 ); said cutting means supporting further sectioning and cutting means ( 50 ) for forming cutting points ( 15 a , 15 b ) on said strip ( 9 a , 9 b ), while simultaneously cooperating with said die means ( 38 ) and with said punch means ( 32 ); and, said punch means ( 32 ) being movable alternatively between a rest position and a position defined by a maximum stroke (MAX) and through a position defined by an intermediate stroke (INT); said primary cutting section ( 34 ) being defined along a cutting area ( 33 ) of said punch means ( 32 ), along such an extension, as to be engaged with said die means ( 38 ) in a position corresponding to the maximum stroke (MAX), as well as in a position corresponding to the intermediate stroke (INT); said secondary cutting section ( 35 ) being defined along a cutting area ( 33 ) of said punch means ( 32 ), along such an extension, so as to engage with said die means ( 38 ) only in a position corresponding to said maximum stroke (MAX).