Two-Roll Cut Sheet Aligning Mechanism
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
An aligner is disclosed which improves reliability in edge alignment of cut sheets. As portrayed in Fig. 1, roll 10 runs at a surface speed approximately 15 percent faster than roll 20. Balls 30 and 40 rest atop rolls 10 and 20, and are restrained by holder 50, although free to revolve. Both rolls are canted at an angle of approximately 10 degrees to drive sheets toward the reference edge. Sheets are introduced by a driven nip under balls 30 and 40, but above rolls 10 and 20. When the trailing edge of the sheet exits the nip drive, the sheet first rotates about the point indicated in Fig. 1. The trailing edge of the sheet contacts the reference edge first, and then the angled drive causes a moment around the trailing corner of the sheet, forcing the entire sheet edge to contact the reference edge.