SHEET TRANSPORT POSITION AND JAM MONITOR

摘要

A sheet transport system (20) comprising: at least one sheet transporter (30 - 36) that receives and hands off a sheet being transported by the system so a s to transport the sheet from a first position to a second position, wherein t he at least one transporter (30-36) comprises at least one orifice (44) through which air is aspirated to create a vacuum that grips a sheet when it is received by the transporter (30-36); a vacuum system coupled to the at least one orifice (44) controllable to aspirate air through the at least one orifi ce (44) to grip the sheet; at least one vacuum sensor (60) that generates signa ls responsive to magnitude of vacuum of the at least one orifice (44); and a controller (49) that receives the signals generated by the at least one vacu um sensor (60) and provides a signal indicative of a location of the sheet in t he transport system (20) from the signals.