Abstract: A more readily manufacturable and repairable lockable removable currency storage cassette is described. The cassette employ a container within a container or box within a box construction in which an outer box provides tamper evident security and a removable inner box contains operating components which may require service or repair.

Abstract: An improved modular currency validator and stacker with a removable currency cassette and a removable currency validator and transport unit is described. The cassette and the validator and transport unit are slidably guided into their operating positions using guides in the chassis, and a currency transport extends from an entry in the validator and transport unit to a prestacking position in the removable cassette. Engagement of a transfer gear in the chassis with gears in the validator and transport unit and the cassette is enhanced by offsetting the gear center lines in a direction perpendicular to the guides, and by enlarging the operating pitch of the gears.