Patent ID: 7210278

Claim:
A detecting and protecting device of a shrink film machine, comprising a plurality of detecting devices connected to respective ones of plural movable expanding assemblies of a bag expanding device of a shrink film machine, each of which movable expanding assemblies includes a supporting rods for shrink films; the detecting devices being positioned below the supporting rods; each of the detecting devices including: a support seat positioned behind a corresponding supporting rod; a movable rod passed through the support seat and projecting below the corresponding supporting rod; a stopping board pivoted to one end of the movable rod; a shading block joined to one end of the stopping board; and a sensor positioned on a portion of the movable rod that is faced with the shading block of the stopping board; the sensor being normally shaded by the shading block; when the stopping board comes into contact with goods to be wrapped in a shrink film during a course of the movable expanding assemblies moving downwards to place the shrink film around the goods, the stopping board will pivot to a tilting position, and the shading block will no longer shade the sensor.