Belt drive for roller blind of e.g. commercial building, has belt guide moved by force of spring element for actuating blocking device during reduced or increased force application by movable belt

摘要

The drive has a movable belt (1) attached at a roller blind (10) for moving the roller blind in an opening direction, where the movable belt is operated manually or by a motor. A belt guide guides the belt by the movement of the belt guide, where the belt guide is loaded with force by the belt. A blocking device is actuatable from a not blocking condition to a blocking condition. The belt guide is movable by the force of a spring element for actuating the blocking device during reduced or increased force application by the belt.