BELT DRIVE UNIT FOR A MOLDING MACHINE OR BORED FINS, IN PARTICULAR FOR HEAT EXCHANGERS, WITH CONTROLLED ADAPTABILITY TO BORES OF DIFFERENT DIAMETERS

摘要

A drive unit (4) of the belt (3) for a molding machine (1) of bored fins comprises a fixed front part (12) and a movable rear part (13) driven longitudinally with a forward and backward movement to and from the fixed front part (12). Both parts (12, 13) of the drive unit (4) include support plates (16, 31) on the upper surfaces thereof for vertical teeth (20, 35) with oblique top (22, 37) which protrude upwards under elastic thrust (24, 39) and are suitable for being inserted into corresponding bored collars (52) of the belt (3) downstream of a boring unit (2). The upper surfaces of each of the two parts (12, 13) of the drive unit (4) support at least a further support plate (17, 32) for vertical teeth (21, 36) of greater diameter, which is liftable and lowerable by a control panel (50).