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 {HEAD ~ selected lateral positions} in {TAIL ~ a direction} transverse to the direction of movement of the sheets through the device 
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 { HEAD ~ selected lateral positions } in { TAIL ~ a direction } transverse to the direction of movement of the sheets through the device
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