Air flow paper sheet registering mechanism - reduces vibration by air jets giving pressure differential to move sheet to compartment wall

摘要

The mechanism (10) is intended for bringing sheets of paper (33) into register. It comprises a compartment (11) with rectangular cross-section capable of receiving the sheet, a stop (21) arranged at one end (20) of the compartment, and nozzle arrangement (34, 35) producing a fluid flow through the compartment to transport the sheel towards the stop. Pump pressure directs fluid jets through the compartment wall, towards a trailing edge of the sheet whilst this is held against the stop by the first fluid flow, the arrangement being such that a static pressure differential is created which moves the sheet towards the wall (11) thus eliminating unstable vibration of the sheet.