Patent ID: 6145286
Filing Date: 2000-11-14
Classification: B65B

Abstract:
Apparatus for strapping packages (1) with a weldable band (7), comprising a band-supply unit (2), a band-transporting and -tensioning unit (3), a closure unit (4) Provided as a separate unit and having an abutment plate (5), and a band-guidance unit (6), said closure unit further including at least one band clamp (15, 19) with a pivotably mounted clamping part (10, 16) and a curved operative surface (40) being provided, wherein the band clamp (15, 19) is self-locking, wherein, between a shaped section (14, 18) of the abutment plate (5) and the operative surface (40) of the clamping part (10, 16), the band clamp (15, 19) has, in a region for clamping the band (7), a point or a zone of engagement which shifts, during pivotal movement of the clamping part (10, 16), on the operative surface (40) of the clamping part (10, 16) in a direction which is counter to the pivotal movement, the point or the zone of engagement being the location or the region where the distance between the shaped section (14, 18) of the abutment plate (5) and the operative surface (40) of the clamping part (10, 16) is smallest, wherein the curved operative surface (40) of the clamping part (10, 16) has at least one radius of curvature r.sub.K, of which the centre point is offset with respect to a pivot axis (13, 17) of the clamping part (10, 16), said radius of curvature r.sub.K being smaller than a radius of curvature R.sub.K of the shaped section (14, 18) of the abutment plate (5).