초록 ▼

A method and a relative unit (1) for producing blister packs (7) by cutting a blister band (4), according to which a band (4) with blisters (2) housing products is fed in a selected feeding direction (A), through subsequent stations: a band (4) verifying station, a closing station where the blister

A method and a relative unit (1) for producing blister packs (7) by cutting a blister band (4), according to which a band (4) with blisters (2) housing products is fed in a selected feeding direction (A), through subsequent stations: a band (4) verifying station, a closing station where the blister band is closed with a covering band, and to a cutting station (5) for cutting the closed blister band (4). In the cutting station (5), the closed blister band (4) is cut by progressive shearing, to obtain relative blister packs (7) detached from at least one strip (9a, 9b) or scrap longitudinal edge of the blister band (4). If portions of the blister band (4) considered unsatisfactory are detected in the control station, the subsequent shearing is performed partially or incompletely, so as to prevent detachment of the corresponding blister packs (8), considered faulty and destined to be rejected, from the strip (9a, 9b) of the band (4).

대표청구항 ▼

The invention claimed is: 1. 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

The invention claimed is: 1. 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 (9a, 9b) 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 (9a, 9b) 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 (15a, 15b) on said strip (9a, 9b), 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). 2. The unit as claimed in claim 1 wherein said cutting area (33) of said punch means (32) has a “V”-shape, having cutting lines inclined with respect to each other and intersecting at a determined point (39). 3. The unit as claimed in claim 2 wherein said primary cutting section (34) includes substantially lateral portions of said “V”-like cutting area (33) and said secondary cutting section (35) is defined substantially by a central portion of said “V”-like cutting area (33) including the intersection point (39). 4. The unit as claimed in claim 1 wherein said cutting area (33) of said punch means (32) is defined by a straight cutting line inclined with inclination oriented from said upper primary section (34) toward said lower secondary section (35). 5. The unit as claimed in claim 1 wherein said cutting area (33) of said punch means (32) is defined by a step conformation (33), in which an upper part is said primary cutting section (34), while a lower part is said secondary cutting section (35). 6. The unit as claimed in claim 1 wherein said punch means (32) are operated to move alternatively by a crank mechanism (43). 7. The unit as claimed in claim 1 further comprising first rejection container means (65), for collecting said strips (9a, 9b) and groups (18), defined by pieces (19a, 19b) obtained by cutting the strips joined to the faulty blister packs (8), which have all the blisters (2) empty; second rejection container means (66) for collecting groups (18) defined by the pieces (19a, 19b) obtained by cutting the strips (9a, 9b) joined to said faulty blister packs (8), which have at least one blister (2) filled with a complete product or with fragments thereof selection means (67) for selecting said strips (9a, 9b) and/or groups (18) for sending them to their respective rejection container means (65, 66).