Detecting and protecting device of a shrink film machine

Details Detecting and protecting device of a shrink film machine Detecting and protecting device of a shrink film machine

2007-05-01

2007-05-01

Sipos, John (Department: 3721)

Package making

With means responsive to a sensed condition

Of receptacle or cover feed or adjunct feed or application

C053S074000, C053S567000, C053S576000

Reexamination Certificate

active

11220560

ABSTRACT:
A detecting and protecting device includes detecting devices, and an ultrasonic sensor; the detecting devices are connected to respective ones of expanding assemblies of a shrink film machine, and each include a seat behind a supporting rod of a corresponding expanding assembly, a movable rod passed through the seat and projecting below the 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 the movable rod and normally shaded by the shading block; if the stopping board comes into contact with goods while a shrink film is being lowered, it will tilt, and the shading block will no longer shade the sensor; the ultrasonic sensor is used for measuring height of the goods such that sealing and cutting action will start immediately after the film encompasses the goods.

REFERENCES:
patent: 4050219 (1977-09-01), Higgins
patent: 4063401 (1977-12-01), Higgins
patent: 4409774 (1983-10-01), Hannen
patent: 4473980 (1984-10-01), Foster
patent: 6381929 (2002-05-01), Chen

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