End sealing device of packaging system

A packaging system includes a conveyor belt having a carrying surface for carrying an article to be packaged by a package film and an end sealing device including spaced upper and lower sealing blocks between which the article passes. A recessed chamber is formed in the carrying surface by extending the conveyor belt around specially arranged rollers. The end sealing device includes a machine frame slidably supported on rails. A driving system includes a motor and a reciprocating mechanism having an adjustable stroke coupling the machine frame to the motor. The rollers of the recessed chamber are attached to the machine frame to be movable therewith. The upper and lower sealing blocks are movably supported on the machine frame by upright posts with the lower sealing block accommodated in the chamber of the conveyor. Racks extend from the upper and lower sealing blocks with a toothed wheel matingly interposed therebetween for mechanically coupling the sealing blocks together. Driving devices, such as pneumatic cylinders, are provided to selectively drive the sealing blocks toward each other for performing sealing operation on the article. The racks are selectively disengageable from the toothed wheel to decouple the sealing blocks from each other thereby allowing adjustment of the distance between the sealing blocks for accommodating articles of different sizes.