Patent ID: 7571904

Claim:
A finisher compiling structure useful in a marking system which comprises in an operative arrangement: at least one variable speed drive shaft, at least one frictional drive element mounted to said drive shaft at a distance from receiving sheets in a compiler tray, said compiler tray adapted to house a stack of receiving sheets, at least one drive shaft speed controller, and at least one drive shaft rotational home position sensor, said finisher located in said marking system positioned after said receiving sheet(s) have been marked, a force on said drive element being dependent on at least height of said drive element from said sheets, said controller(s) and sensor(s) sensing said shaft speed and said drive element height monitoring and controlling of the height of said stack from said shaft so that a substantially constant drive force is exerted by said drive element upon said stack of receiving sheets and wherein said speed is sensed to indicate when to index the shaft up away from the stack.