Universal hot air nozzle and seal bar with adjustable cam

Abstract

A universal hot air nozzle and seal bar with adjustable cam for use on an apparatus for forming and assembling tubular thermoplastic sleeves. The apparatus has a circumferentially movable turret with a plurality of mandrels forming work stations thereon. At the work stations each mandrel has a nozzle and seal bar and the sleeve is wrapped around the coacting mandrel with the vertical edges of the sleeve being disposed in overlapping relation with heat being applied by a stationary heat nozzle to the overlapped edges in coaction with a stationary seal bar being subsequently advanced to the heated overlapped edges with preselected pressure to heat-seal such edges together. The improvement includes cam-actuated telescoping mounting means in the form of a slidable telescoping shaft within a slidable telescoping shaft upon which the seal bar is mounted enabling the seal bar to selectively contact the sleeve with preselected pressure. The cam can be adjusted to cause the seal bar to stay in contact with the sleeve overlapped edges longer at high speeds to effect better sealing. The heat nozzle is also mounted on adjustable mounting means enabling the heat nozzle to be selectively adjusted to and from the mandrel to heat the overlapped edges of different diameter sleeves.