Abstract: A closure for attachment to a centrifuge bottle. The closure comprises an end wall and a sidewall extending from the end wall. The sidewall comprises a first terminal end, a second terminal end, a first transition surface, and a second transition surface. The first terminal end has a first outer peripheral boundary at a first radial distance from an axial centerline. The second terminal end has a second outer peripheral boundary at a second radial distance from the axial centerline. The second radial distance is less than the first radial distance. The first transition surface extends between the first outer peripheral boundary and the second transition surface. The second transition surface extends between the first transition surface and the second outer peripheral boundary.

Abstract: A closure for attachment to a centrifuge bottle. The closure comprises an end wall and a sidewall extending from the end wall. The sidewall comprises a first terminal end, a second terminal end, a first transition surface, and a second transition surface. The first terminal end has a first outer peripheral boundary at a first radial distance from an axial centerline. The second terminal end has a second outer peripheral boundary at a second radial distance from the axial centerline. The second radial distance is less than the first radial distance. The first transition surface extends between the first outer peripheral boundary and the second transition surface. The second transition surface extends between the first transition surface and the second outer peripheral boundary.

Abstract: A justification apparatus, which receives cut sheets of different widths along a path in an in-track direction of travel, aligns the sheets relative to an in-track axis. The apparatus includes a tray having a planar surface for receiving unconstrained sheets. An edge abutment is movable in opposed directions parallel to the plane of the tray surface so as to contact a side edge of a sheet received on the surface to move the sheet with the edge abutment.

Abstract: Apparatus for advancing the cut sheets in an in-track direction to a sheet justification apparatus includes a driven roller and a gimbaled, self-aligning follower associated with the driven roller. The follower is movable between an engaged position, forming a nip with the driven roller, and a disengaged position, spaced from the driven roller. The follower is selectively movable to its engaged position to direct media from to the justification mechanism, to its disengaged position to allow the justification mechanism to justify the sheet, and back to its engaged position without introducing skew or shift as it re-engages the media to direct media from the justification mechanism without introducing skew or linear shift. The driven roller and the follower may be associated such that the media forms a wrap angle partially around the roller.