{HEAD ~ The improvement} comprises {TAIL ~ the conveyor} means including single drive means for driving the continuous belt of each conveyor unit, control means for sequentially operating the drive means, and said mounting means adjustably mounting the conveyor units in selected lateral positions in a direction transverse to the direction of movement of the sheets through the device 
comprises
{ HEAD ~ The improvement } comprises { TAIL ~ the conveyor } means including single drive means for driving the continuous belt of each conveyor unit , control means for sequentially operating the drive means , and said mounting means adjustably mounting the conveyor units in selected lateral positions in a direction transverse to the direction of movement of the sheets through the device
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