Suction tape conveyor table

Device for conveying a stream of sheets to a sheet-processing machine, comprising:

• a conveyor table with endless transport tapes formed with through-holes and drivable around said conveyor table, said transport tapes having an underside and said conveyor table having suction openings formed therein;
• a suction box disposed below said conveyor table and connected with said underside of said transport tapes via said suction openings formed in said conveyor table;
• three suction chambers formed in said suction box and extending in succession in a sheet transport direction, said suction chambers including a first suction chamber subjectible to underpressure by a first vacuum source, a third suction chamber facing towards the sheet-processing machine, and a second and middle suction chamber subjectible in common with said third suction chamber to underpressure by a second vacuum source;
• a suction roller located between a sheet pile and said conveyor table, said suction roller being subjectible to underpressure together with said first suction chamber by said first vacuum source;
• and
• said suction roller having a plurality of suction holes distributed over the circumference thereof, said suction holes, in a region of said circumference of said suction roller facing towards a sheet, and being subjectible to underpressure of a given level.