Patent ID: 6889820
Filing Date: 2005-05-10
Classification: B06B,B07B,Y10T

Abstract:
1. An exciter apparatus comprising a pair of counter-rotating eccentric masses on respective driven shafts mounted for rotation in an exciter body on a screen machine, said masses having a phase relationship that provides a net direction of excitation and wherein said masses are coupled by synchronization means comprising a gear train coupling said shafts and selected to bring said masses substantially into said phase relationship, said drive shafts having respective drive means selected to allow substantially independent rotation of said drive shafts at said phase relationship, and wherein the median of said direction of excitation being selected to pass through the notional centre of gravity of the screen machine; and adjustment means adapted to dynamically align said net direction of excitation with the centre of gravity of said screen in use and provided by allowing a lash of from 2 to 10°, measured at said shafts in said gear train.