Abstract: In a hard copy document production machine using a plurality of different type cartridges containing different document production consumable materials, an orientation-independent cartridge type discriminating system assembly suitable for enabling non-burdensome orientation-independent loading of a correct cartridge into a cartridge opening in the machine, and for resiliently intercepting and preventing loading of an incorrect cartridge into the cartridge opening. The discriminating system assembly includes a resilient assembly mounted to a portion of the frame of the machine defining the cartridge opening, a first spring member, and a pivotable elongate member connected to the spring member for providing resilient cartridge contact with a cartridge being inserted. The elongate member has a displaceable portion, and a cartridge blocking portion spaced from the displaceable portion in a direction of cartridge insertion.