Relational Modeling of Biological Data: Trees and Graphs

An improved spindle for mounting a tape reel of a tape cartridge for rotation wherein the spindle includes the shaft provided with a rotor for insertion into the hub of the tape reel. The rotor has detent means which cooperate with inner peripheral teeth on the reel hub to couple the reel to the spindle rotor for rotation about the axis of the spindle shaft. The invention is especially adapted for use with a reel-over-reel cartridge wherein a pair of co-axial spindles are adapted to be connected with the two reels of the cartridge.