Patent ID: 7124973

Claim:
A drive device to which a recording tape cartridge is loaded, and which can record information in a recording tape and playback information recorded in the recording tape, the recording tape cartridge including: a case; a reel accommodated in the case, having a reel hub around which the recording tape is wound, and having an engaging portion formed on a bottom of the reel hub; a brake member which is non-rotatably provided in the case, which approaches and moves away from the bottom of the reel hub, and which can be located in a rotation locked position where the brake member engages with the engaging portion and a rotation permitted position where the engagement state between the brake member and the engaging portion is released; and a reel gear formed on the reel and exposed from a gear opening formed in the case, the drive device comprising: a rotating shaft having a drive gear which meshes with the reel gear and rotates the reel; an operating member which pushes up the brake member to the rotation permitted position; and an adjusting mechanism which adjusts a projecting height of the operating member.