| 摘要 |
The present invention refers to a speed controller for an aperture closing element, and to a method for controlling speed of said element. According to the invention, a speed controller for an aperture closing element (31) that is movable between a first position wherein said aperture is closed by said closing element (31) and a second position wherein said aperture is at least partly opened comprises a movable member (5) adapted to be associated to a portion of said closing element (31), and a movement transmission assembly (11, 18, 19, 20). Said speed controller is characterised in that said transmission assembly (11, 18, 19, 20) comprises, in combination, a motor-dynamo (20) and a one-way clutch (18) arranged such that a first movement can be transferred from the movable member (5) to said motor-dynamo and a second movement, opposed to said first movement, can be transferred from said motor-dynamo (20) to the movable member (5). |
