| 摘要 |
An operation group for use with a curtain winding roll is described relative to a first embodiment and a second embodiment (G 1 , G 2 ), the first for automatically and the second for manually winding up curtains. According to the first embodiment (G 1 ), the operation group includes a mechanism ( 1 ), connected to a head ( 3 a) of a curtain winding roll ( 3 ). A stop device ( 90 ) defines a hub ( 9 ) connected to the remaining winding roll head. According to the second embodiment (G 2 ), the operation group has instead a pulley ( 95 ) defining the hub ( 9 ). The mechanism ( 1 ) is operated by first sliding the barrel ( 5 ), connected to a first elastic element ( 2 ) situated inside the roll ( 3 ), axially to disengage a clutch ( 7 ), and then by rotating the barrel in one direction or another. When the mechanism is released, a second elastic element ( 6 ) slides the barrel ( 5 ) back, to re-engage the clutch ( 7 ). Adapter rings ( 30,300 ) allow use of the operation group with rolls ( 3 ) of different diameters.
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