Patent ID: 7631859

Claim:
A stacker system positioned in a marking device after a paper substrate(s) or print has been marked, said system comprising a first disc stacker and a second disc stacker, and a stacker-compiler tray, said disc stackers being two opposing disc stackers facing each other positioned on opposite sides of said stacker-compiler tray, said two opposing disc stackers configured to have alternating paper output to said stacker compiler tray, said stacker compiler tray configured to receive stacks of said paper, said disc stackers configured to rotate and stack said substrates when said substrates are delivered into a disc input slot of each of said disc stackers, said system configured to handle said substrates for either or both stacking and stitching at production rates of up to 360 prints per minute; and said substrates are driven into said system and are configured to be directed in an alternating one or two-sheet sequence separately to each of said two disc stackers; and wherein said system is configured to provide continuously during a two-sheet alternating sequence where a first two sheets or substrates are directed to said first disc stacker and a third and fourth substrates are directed to said second disc stacker, and in a one-sheet alternating sequence, a first single alternating sheet is sent to said first disc stacker and a second sheet is sent to said second disc stacker, and wherein said stacker compiler tray comprises a collection tray and a collector output tray, said collector tray configured to horizontally transfer said stacked paper or substrates thereon to said collector output tray when said collector tray becomes full, said collector tray comprising projections that are configured to slidably fit into grooves of said collector output tray as said substrate stacked paper is being horizontally transferred from said collector tray to said collector output tray; said collector tray thereby configured to be ready after said transfer to accept a new stack of papers from said disc stackers without any stacked paper collection interruption in said system.