Paper sheet braking method and apparatus in sheet discharge device of sheet-fed rotary printing press

摘要

The decelerator uses a jet of air, directed opposite to the sheet movement direction (4). The air jet is set to a condition of balance between its energy acting on the sheet, and the kinetic energy of the sheet. In the deceleration area, the sheet is supported contact free by the air jet. This air jet, and an opposite air jet, which transports a sheet contact free to a stack, are diverted downwards in front of the deceleration area. The air jets are returned to the brake nozzles (6) via a regulator (7).