Patent ID: 7976009

Claim:
A method of controlling sheets in a digital printing machine, comprising: detecting the arrival of a sheet in a transport path at a first location of said transport path, determining a first state of at least one signal having a countable pulse when the sheet is detected at the first location; detecting the arrival of reference on a transfer belt at a first marked location; determining a first number of countable pulses after which the position of at least one frame, comprising an occupiable field of a plurality of frames on a transport belt that has a known position relative to said reference will arrive at the marked location; adjusting movement of the sheet through the transport path by a first comparison of a difference between the initial state of the counter and determined number of countable pulses associated with the first location; determining a second state of at least one signal having a countable pulse when the sheet is detected at a second marked location in the transport path; determining a second number of countable pulses after which the position of the at least one frame will arrive at the marked location; adjusting further movement of the sheet through the transport path toward the marked location by a second comparison of a difference between the second state and the number of countable pulses with a predetermined number of countable pulses associated with the second location; wherein sheet is moved so that the sheet feeds onto the transport belt aligned with the frame.