Importance

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Abstract

This relates to a positioning device for positioning a member relative to a work piece. In the preferred use of the positioning device, a sealing head is carried by the positioning device with the sealing head having a first lowered position for picking up a lid for a container and a second lowered position for positioning the lid and thereafter bringing the lid into pressure engagement with an associated container and effect the heat sealing of the lid to the container. The positioning device includes an extensible fluid motor of the piston and cylinder type which is mounted within a guide sleeve for selective vertical positioning by way of a cam follower and cam track and which extensible fluid motor is further selectively extensible so as to further move an associated member carried thereby downwardly and into resilient clamping engagement with the work piece.

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First Claim