are increased in speed before passing through a vacuum conveyor shingling section are slowed down at the shingling section and then normally proceed at the slowed down speed to a stacker which is adapted to stack a fixed number of sheets before discharging a stack the sheets are basically handled in accordance with the device disclosed in u s pat no 4 200 276 to prevent scattering of the sheets during shingling due to high input conveyor speeds and the like the vacuum conveyor shingling section includes a second conveyor upstream of the original shingling conveyor the pre shingling conveyor operates at a relatively high rate of speed while the original shingling conveyor operates at a relatively low rate of speed relative to the sheet input speed a setting control is provided to pre set the pre shingler conveyor speed in correlation with the input speed of the sheets and the length of the individual sheets the pre set pre shingler conveyor speed remains constant during operation of the device conveyors downstream of the pre shingling conveyor run at speeds which are correlated to the speed of the supplemental pre shingling conveyor application_number US 66435384 A description as best shown in fig1 a 1b and 2 the concept of the invention may be embodied in a device which includes in line an input conveyor section 1 a paperboard cutting section 2 a speed up conveyor section 3 a diverter section 4 a vacuum conveyor section 5 an accumulating conveyor section 6 a stack infeed conveyor section 7 and a sheet stacker 8 input conveyor section 1.