Stationary head tape drive with a movable door opening mechanism

A drive for an elongate, rectangular tape cartridge having a pair of sides and a pair of ends which are shorter than said sides, said cartridge enclosing a length of tape and including a door in one of said sides proximate one of said ends for providing access to said length of tape, said drive comprising:

• an elongate housing having one end which forms a slot, said slot sized and shaped to receive said cartridge for loading into said housing from an insertion position to a read/write position with the end of said cartridge proximate said access door being loaded into said slot first;
• a magnetic head;
• a ratchet mechanism mounted in said housing for at least partially opening said door of said cartridge;
• a motor for moving said length of tape within said cartridge along said magnetic head when said cartridge is in said read/write position with said magnetic head adjacent said length of tape;
• and
• an actuator mounted on said housing which contacts said ratchet mechanism when said cartridge is moved from said insertion position toward said read/write position for biasing said ratchet mechanism to pivotably open said door, wherein said ratchet mechanism comprises:
• a first pivot;
• a drive arm rotatably mounted on said first pivot so that movement of said cartridge toward said read/write position forces said ratchet mechanism into contact with said actuator causing said drive arm to pivot;
• a second pivot;
• a ratchet rotatably mounted on said second pivot operatively engaging said drive arm so that pivoting of said drive arm causes rotation of said ratchet, said ratchet including an annulus defining a series of peaks spaced from one another by valleys;
• a third pivot;
• and
• a leg rotatably mounted on said third pivot operatively engaging said annulus of said ratchet so that rotation of said ratchet causes rotation of said leg into engagement with the door of said cartridge, wherein the rotation of said leg opens the door.