Patent ID: 7735343
Filing Date: 2010-06-15
Classification: D06B

Abstract:
1. Sealing head for machines for thermally treating filaments, which is essentially constituted by a frame ( 1 ) fixed to a pressurized chamber traversed by a conveyor belt, by a pair of horizontal superposed rollers ( 2 and 3 ), which are pressed against opposite surfaces of the conveyor belt, and by sealing means 4 and 5 to form a sealed closure between the rollers ( 2 and 3 ) and the frame ( 1 ), at least one ( 2 ) of the horizontal rollers and the sealing means ( 4 and 5 ) being connected to actuators for corresponding movement ( 8 and 9 ) characterized in that the sealing means ( 4 and 5 ) to form a sealed closure between the rollers ( 2 and 3 ) and the frame ( 1 ) are each provided with an integrated lubricating means ( 4 ′, 5 ′), under pressure or by capillarity, each lubricating means being of the integrated type under pressure ( 4 ′), ( 5 ′), being present in the form of a porous body disposed between the support ( 4 , 5 ) forming the sealing means and the superposed horizontal rollers ( 2 and 3 ) and being connected by its surface turned toward said support ( 4 , 5 ) to a means ( 4 ″, 5 ″) for distributing a lubricant under pressure, said means ( 4 ″, 5 ″) being connected, externally of the support ( 4 , 5 ), to a supply conduit for lubricant under pressure, means for detecting wear ( 10 , 11 ) of the sealing means ( 4 and 5 ), including their surface in contact with the longitudinal sealing rollers ( 2 and 3 ) both along their generatrix and at their ends, wherein the wear detection means ( 10 , 11 ) comprises at least one movement detector ( 10 , 11 ) belonging to the application means of the sealing devices against the surfaces of the horizontal rollers ( 2 and 3 ), and the movement detectors ( 10 and 11 ) belonging respectively to the sealing means ( 4 and 5 ) are each present in the form of at least one end of path contact coacting with a cam ( 12 , 13 ) provided on a piston rod or a transmission rod of the actuator ( 8 , 10 ) for pressurizing the application of the sealing means ( 4 , 5 ), this cam ( 12 , 13 ) entering into contact with the detector ( 10 , 11 ) after a movement corresponding to optimum wear of the sealing means ( 4 and 5 ).