Recording tape cartridge and brake member provided thereto

摘要

A recording tape cartridge of the present invention includes: a reel formed with an engagement portion on a bottom portion of a reel hub; a resin brake member moving toward and away from the bottom portion of the reel hub, and selectively adopting a rotation locked position and a rotation permitted position; a resin release member being capable of movement in a reel axial direction and rotating as a unit with the reel; and a projection portion that projects out in the reel axial direction from an axial center portion of either the brake member or the release member, that is formed with a housing portion housing a spherical member that contacts the other out of the brake member or the release member, and that is formed with a lip portion jutting out from an opening end portion of the housing portion toward a reel radial direction inner side.

主权项

1. A recording tape cartridge comprising:
a reel that is housed inside a case, and that is formed with an engagement portion on a bottom portion of a bottomed circular cylinder shaped reel hub onto which a recording tape is wound; a resin brake member that is non-rotatably provided inside the case, that moves toward and away from the bottom portion of the reel hub, and that selectively adopts a rotation locked position where the brake member engages with the engagement portion, and a rotation permitted position where the engaged state with the engagement portion is released; a resin release member that is provided at the bottom portion of the reel hub so as to be capable of movement in a reel axial direction and so as to rotate as a unit with the reel, and that is capable of moving the brake member to the rotation permitted position; and a projection portion that is provided projecting out in the reel axial direction from an axial center portion of either the brake member or the release member, that is formed with a housing portion housing a spherical member that contacts the other out of the brake member or the release member, and that is formed with a lip portion jutting out from an opening end portion of the housing portion toward a reel radial direction inner side so as to retain the spherical member housed in the housing portion, wherein a portion of the projection portion, at a side of the opening end portion of the housing portion, undergoes resilient deformation toward a reel radial direction outer side, such that the housing portion takes in the spherical member from the opening end portion of the housing portion.