Patent ID: 11970352
Assignee: VALMET TECHNOLOGIES OY
Field: Handling (Mechanical engineering)
Classification: CPC B  D | IPC B  D

Claim 17:
18. A braking apparatus in a fiber web machine including an idler roll having an outer shell with an outer shell surface, the braking apparatus comprising:
an actuator having an extensible piston, the piston being extensible in a radial direction with respect to the idler roll; and
a permanent magnet mounted to the extensible piston and spaced from the outer shell surface, the actuator arranged to move the permanent magnet on the piston between a non-braking position located a first distance from the outer shell surface to a braking position located a second distance from the outer shell surface, wherein the second distance is less than the first distance and wherein at the second distance the permanent magnet is not in contact with the outer shell surface, wherein the braking apparatus is located outside the outer shell surface of the idler roll.