Abstract: A segmenting mechanism includes outer and inner frame members that define a sliding space and an aperture extending therethrough. A first set of sliding blades operates linearly and proximate the aperture. A second set of sliding blades is positioned in an alternating configuration with the first set of sliding blades and also operates linearly within the sliding space proximate the aperture. Each sliding blade of the first and second sets of sliding blades operates cooperatively and simultaneously along each dedicated linear path from a start position, through a medial position to an end position. The start and end positions are each defined by the sliding blades being outside of the aperture to define respective first and second open states of the aperture. The medial position is defined by the sliding blades being at least partially within the aperture to define a closed state of the aperture.