Leaf Shutter - Educational model

My Educational Mechanical Examples SeriesThis model is one of my educational mechanical mechanism examples on 80mm x 80mm base plates.You can find all models of the series in this collection => [Mechanical Mechanism Examples]This modelThis is an educational model of a leaf shutter, in which the motion of each blade is realized by a four-bar mechanism. Brief DescriptionThis model demonstrates a mechanical leaf shutter mechanism made of several blades, which are the leaves, arranged around a central opening. You can open or close the shutter by rotating the outer ring. In this model, each blade, its corresponding arm, the outer ring and the base plate together form a small four-bar linkage (→ Wikipedia), as illustrated below. There, the input link and the central joint is virtual. Notice that the joint on the outer ring moves in a circular path around the central pivot. This implies the presence of a virtual link between them. When the outer ring is rotated back and forth, this motion co