APPARATUS FOR HEATING PARISONS OF THERMOPLASTIC MATERIAL

摘要

An apparatus (1) for heating parisons (2) of thermoplastic material comprises: a conveyor (3) defining a path along which the parisons (2) are fed; a plurality of supporting elements (6) having a structure (7) fixed to the conveyor (3) and a rod (8) rotatably associated with the structure (7) to rotate about a longitudinal axis and mobile axially relative to the structure (7) between a lowered position, where a lower end of the rod (8) is operatively inserted in a parison (2) in such a way as to retain it and drive it rotationally about its longitudinal axis, and a raised position, where the parison (2) is disengaged from the rod (8); a linking element (11) kinematically coupled to rotary means (12) rotatably associated with the structures (7) and coupled to the rods (8) in such a way that the rods (8) are made to rotate about their longitudinal axes while they move as one with the conveyor (3); heating means (10) designed to heat the parisons (2) as the latter move along at least a part of their feed path. The supporting element (6) comprises a friction clutch (13) connected to the rod (8) and to the rotary member (12) to define a first operating position, where the rod (8) is engaged with the rotary member (12), and a second operating position, where the rod (8) is disengaged from the rotary member (12).