| 摘要 |
<p>A roller door apparatus (10) is provided that includes a roller means (18) and a means journalling the roller means (18) for reversible rotation about a central longitudinal roller axis. The roller door (10) also includes end rail means (16) for a reciprocal linear movement between a first position adjacent the roller means (18) and a second position away from the roller means (18). Also included is a flexible curtain means (11) with the one end attached to the end rail means (16) and the other end attached to the roller means (18), such that the curtain means (11) closes a door opening with the end rail means (16) in the second position. The curtain means (11) winds onto the roller means (18) when the end rail (16) moves from the second position to the first position and vice versa. The roller door (10) further includes a reversible electric drive motor means (42) coupled to the roller means (18) during movement of the end rail means (16) for rapid acceleration of the curtain means (11) during an initial portion of each movement, and for control of deceleration of the curtain means (11) to zero velocity during a final portion of each movement.</p> |
