Browse Prior Art Database

Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01

Publishing Venue

Xerox Disclosure Journal


An air flotation feed tray 1 contains a stack of sheets 2 which are supported by an airbearing effect from air streams 3. A vacuum feed wheel 4 contacts the bottom sheet of the stack 2 and advances the bottom sheet towards the friction retard feeder when the vacuum feed wheel is rotated. At the friction retard feeder the bottom sheet is engaged by a feed belt 3 which frictionally advances the sheet. The top of the bottom sheet is engaged by a retard pad 6 which engages the bottom sheet at a lower friction than the feed belt 5 so that if the bottom sheet from the vacuum feed wheel consists of two or more sheets stuck together, the feed belt 5 would advance the bottommost sheet while the retard pad 6 would retard the forward motion of the top sheet. As shown in Figure 2, the vacuum feed wheel 4 has a vacuum intake means 7 communicating with the interior of the vacuum feed wheel 4. The surface of the vacuum feed wheel 4 has areas marked by a plurality of holes 8 through which the interior of the vacuum feed wheel 4 may communicate with its exterior. The vacuum feed wheel 4 may advantageously have surface areas 9, which are not marked by any holes, so that the sheet being advanced is not retarded by vacuum feed wheel 4 at that point but is primarily controlled by the feed belt retard pad.