| 摘要 |
<p>In a machine for making sealed containers such as blister packages, the continuous feeding or the films (1,7) for the formation and sealing of the containers is effected alternately by at least one unit of side clamping grippers (13) and by a unit comprising the stations operating cyclically on said films: namely, the heating station (3), the container-forming station (4), the sealing station (6) and the cutting station (8). Said grippers and stations are movable on rectilinear guides (11, 121 disposed parallel to the path of travel of said films, and said operative units are reciprocated over saia guides by a mechanism comprising a single cylindrical cam (24) having a closed helical outline or profile that is followed by two cam-followers(21-21') angularly spaced 180° from each other and slidable on stationary guides parallel to the axis of said cam The length ofthe cam profilethat causes the advancing movement of said stations or said grippers, and consequently the feeding movement of the films, has an angular extent larger than the length of the profile that causes the reverse movement of said operative units, whereby the latter operate together and synchronously during a fraction of the advancing stroke and whereby said films are engaged at all times by either one of said operative units when the other one reverses to effect the return stroke.</p> |
