Patent ID: 7497436

Claim:
A media cassette pusher plate locking mechanism comprising: (i) a ratchet bar arranged to be mounted in the media cassette in use such that it is rotatable about its longitudinal axis between a transit position, in which the bar engages a pusher plate assembly to lock a pusher plate, and an active position in which the ratchet bar is disengaged from the pusher plate assembly such that the pusher plate is released; (ii) a biasing mechanism for resiliently biasing the ratchet bar into the transit position; and (iii) a cam coupled to the ratchet bar and arranged to engage with a dispenser into which the media cassette is inserted, the cam being formed to urge the ratchet bar into the active position on insertion of the cassette into the dispenser; wherein the ratchet bar comprises a plurality of teeth arranged in a row substantially along a line of longitude of the ratchet bar.