Brake of an idler roll of a fiber web machine, in particular of a slitter-winder
AssigneeValmet Technologies Oy
InventorArto Leskinen
Life of this patent
Estimating the term…
Abstract
A brake is provided for an idler roll (10) of a fiber web machine, in particular of a slitter-winder, which idler roll (10) has an outer shell surface (13). The brake (20) is located outside the outer shell surface (13) of the idler roll (10) in close vicinity of the idler roll (10) in a non-contacting position. The brake (20) has a permanent magnet (25), which is configured to be moved from non-braking position to a braking position and vice versa by an actuator or cylinder (35, 45).
Claims18
An idler roll brake in a fiber web machine, comprising:
- an idler roll having an outer shell, the outer shell having an outer shell surface;
- a brake located outside the outer shell surface of the idler roll;
- and
- wherein the brake comprises a permanent magnet arranged to be moved by an actuator from a non-braking position spaced from the outer shell surface of the idler roll to a braking position near but not in contact with the outer shell surface, the actuator also arranged to move the brake back to the non-braking position spaced from the outer shell surface.
An idler roll brake in a fiber web machine, comprising:
- an electrically conductive idler roll having an outer shell, the outer shell having an outer shell surface;
- a brake comprising a permanent magnet located outside the outer shell surface of the idler roll;
- and
- wherein the permanent magnet is mounted for movement by an actuator to move from a position spaced at least 5 mm from the outer shell surface of the idler roll to a position where the permanent magnet interacts with the electrically conductive idler roll to stop the rotation of the electrically conductive idler roll in less than 2 minutes.
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.
Dependencies are inferred from the claim text.