Some estimation and restoration techniques for statistical image analysis

A device for working a heat plate having plural blades disposed in parallel with one another thereon for use in an apparatus for welding a thermoplastic band through melting of the overlapped portions of said band by virtue of the pressing of said blades against it, wherein: a heat plate pivoted by a guide pin on a guide frame in slidable and rotatable fashion and having a stopper is provided in slidable fashion on a slide plate mounted on the guide frame slidably and engaged with an adjusting stopper provided on said guide frame; and a cam mechanism to rotate said heat plate so as to make its tip go down by virtue of the sliding movement of said slide plate after said adjusting stopper has been engaged with said guide pin to thereby stop the heat plate.