The improvement comprises 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 {HEAD ~ a direction} transverse to {TAIL ~ the direction} of movement of the sheets through the device 
transverse to
The improvement comprises 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 { HEAD ~ a direction } transverse to { TAIL ~ the direction } of movement of the sheets through the device
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