Patent ID: 8286788

Claim:
Machine for the thermal treatment of threads, comprising a pressurized enclosure ( 1 ), through which a conveyor belt ( 2 ) having opposite faces passes, and which is closed at each end by a sealing head mounted on a frame or moving body holder ( 3 ), which is connected to the pressurized enclosure ( 1 ) through the intermediary of a bellows ( 4 ), where each sealing head comprises a pair of superposed horizontal rollers ( 5 , 6 ), which are pressed against the opposite faces of the conveyor belt ( 2 ), and by a device for positioning the conveyor belt ( 2 ) during its advance in the pressurized enclosure ( 1 ), which comprises a positioning means ( 8 ) and a position control means ( 9 ) acting on a very short area in the immediate proximity of each sealing head, where said positioning means ( 8 ) consists of an axle ( 10 ) for pivoting the frame or moving body holder ( 3 ), which is integrally connected directly to said frame or moving body holder ( 3 ), and of an actuator ( 11 ) that actuates the pivoting of the frame or moving body holder ( 3 ), acting on said frame or moving body holder ( 3 ) through the intermediary of a rod linkage ( 12 ), which is mounted between the edge of the frame or moving body holder ( 3 ) and said actuator ( 11 ), which is in the form of at least one jack that is connected directly to the rod linkage ( 12 ) for driving the frame or moving body holder ( 3 ) in a pivoting motion, characterized in that the device for positioning the conveyor belt ( 2 ) during its advance in the pressurized enclosure ( 1 ) is provided, on the side over which a sensor forming the position control means ( 9 ) extends, namely below or above the conveyor belt ( 2 ), with a means for holding the conveyor belt ( 2 ) at a height separation with respect to the position control means ( 9 ).