Abstract: An inspection and/or processing apparatus for sheets such as banknotes includes a stacker wheel arrangement in which, rather than continuously rotating the stacker wheel and decelerating or accelerating the wheel to adjust the wheel speed in order to cause the grooves to align with the entrance chute at the same time that sheets arrive at the wheel, the stacker wheel is rotated only between sheet arrivals, and only for the purpose of indexing the stacker wheel to a new position at which a sheet can enter the stacker wheel without jamming. Indexing of the stacker wheel follows a predetermined profile, and the stacker wheel held stationary at each predetermined aligned position until a respective individual sheet has entered the stacker wheel.

Abstract: A separator card substrate material for use in high speed document processing machines is imprinted with an array of periodically laterally spaced magnetic strips across an area of the face of the substrate and furthermore a machine readable code array of light and dark blocks representing selected data is imprinted in at least a portion of the same space of the substrate as is occupied by the magnetic strips with the light and dark blocks spanning widthwise dimensions between the strips as well as lengthwise dimensions between the strips. The interleaving of the magnetic strips and the light and dark blocks enables the separator card to be encoded with relatively large fields of optical data enabling the use of low resolution sensors for detecting the optical data used to uniquely identify each separator card without interfering with the function of the magnetic strips.