Recording tape cartridge

A recording tape cartridge comprising:

• a reel rotatably accommodated within a case, a recording tape being wound around an outer peripheral portion of a reel hub which is formed in a shape of a cylindrical tube having a bottom portion;
• an engaging portion provided at an inner surface of the bottom portion of the reel hub;
• a reel gear which is annular, and which is provided coaxially at an outer surface of the bottom portion of the reel hub, and which can mesh with a driving gear of a drive device;
• a braking member, provided so as to be unable to rotate within the case, able to move to a rotation locked position at which the braking member engages with the engaging portion by closing to the bottom portion of the reel hub, and to a rotation permitted position, at which an engaged state with the engaging portion is released by being away from the bottom portion of the reel hub;
• a releasing member having a main body portion positioned within the reel hub, and an operation portion provided at the main body portion and exposed, from a position further toward a radial direction inner side than the reel gear at the bottom portion of the reel hub, to an exterior, the releasing member moving the braking member to the rotation permitted position by the operation portion being pushed by a releasing portion of a drive device;
• a boss portion, provided at the inner surface of the bottom portion of the reel hub, further toward the radial direction inner side than the reel gear, which includes a hole, the operation portion of the releasing member being able to pass through the hole and expose to the exterior of the outer surface of the reel hub;
• and
• a guide member, provided at the releasing member, for guiding the releasing member in a moving direction along an axial direction of the reel and for impeding rotation of the releasing member with respect to the reel by engaging with the boss portion.

A recording tape cartridge comprising:

• a reel rotatably accommodated within a case, a recording tape being wound around an outer peripheral portion of a reel hub which is formed in a shape of a cylindrical tube having a bottom portion;
• an engaging portion provided at an inner surface of the bottom portion of the reel hub;
• a reel gear which is annular, and which is provided coaxially at an outer surface of the bottom portion of the reel hub, and which can mesh with a driving gear of a drive device;
• a braking member, provided so as to be unable to rotate within the case, able to move to a rotation locked position at which the braking member engages with the engaging portion by closing to the bottom portion of the reel hub, and to a rotation permitted position, at which an engaged state with the engaging portion is released by being away from the bottom portion of the reel hub;
• a releasing member, having a main body portion and an operation portion provided at the main body portion, provided within the reel hub, further toward a radial direction inner side than the reel gear at the bottom portion of the reel hub, the releasing member moving the braking member to the rotation permitted position by the operation portion being pushed by a releasing portion of a drive device;
• a guide portion provided, at the bottom portion of the reel hub, further toward the radial direction inner side than the reel gear;
• and
• a guide member, provided at the releasing member, for guiding the releasing member in a moving direction along an axial direction of the reel and for impeding rotation of the releasing member with respect to the reel by engaging with the guide portion.