Patent ID: 7954302
Filing Date: 2011-06-07
Classification: B29C,B29L,B65B

Abstract:
1. An apparatus for sealing a cover film to a blister film having blisters holding respective small objects, the apparatus comprising: a feed roll rotatable about an axis and formed with an array of radially outwardly open recesses arrayed like the blisters of the blister film, the blister film passing over the feed roll with the blisters in the recesses; a sealing roll rotatable about an axis generally parallel to the feed-roll axis and pressing the cover foil down against the blister foil on the feed roll; a roll holder shiftable toward and away from the feed roll, the sealing roll being journaled for rotation about the sealing-roll axis in the roll holder; means for rotating the feed roll and thereby pulling the films in a travel direction between the rolls, whereby the cover film is sealed to the blister film between the blisters thereof; at least one strain gauge engaging the roll holder for detecting movement of the sealing roll transversely of the feed-roll axis; and control means for generating an output when the movement detected by the strain gauge exceeds a predetermined threshold.