Method of manufacturing a recording tape cartridge
View Patent ↗A recording tape cartridge including: a reel, and gear teeth are provided at an inner side of a floor portion of a reel hub on which a recording tape is wound; a case which accommodates the reel, and an engaging projection is formed at a surface of the case opposing the floor portion of the reel hub; a braking member having a disc, and a braking gear, which is annular and which can mesh with the gear teeth, is provided at one surface of the disc, and the braking member can move within the case in a direction of thickness of the case; and a groove wall portion standing erect at the disc and demarcating an insertion groove in which the engaging projection enters over an entire stroke of movement of the braking member. The groove wall portion impedes rotation of the braking member, and guides the braking member.
1. A method of manufacturing a recording tape cartridge having a locking mechanism locking a reel which is accommodated in a case and on which a recording tape is wound, the method comprising the steps of:
a. forming gear teeth at an inner side of a floor portion of a reel hub of the reel;
b. forming an engaging projection at a surface of the case which surface opposes the floor portion of the reel hub;
c. forming a braking member having a disc, and a braking gear, which is annular and which can mesh with the gear teeth, is provided at one surface of the disc, and a groove wall portion, which demarcates an insertion groove into which the engaging projection enters, stands erect at the disc, and the braking member can approach and move away from the floor portion of the reel hub within the case; and
d. combining the braking member and the reel within the case; wherein
the engaging projection includes projecting pieces which enter through-holes formed in the braking member when the braking member moves away from the floor portion of the reel hub within the case.
2. The method of manufacturing a recording tape cartridge of claim 1 , wherein the engaging projection is formed in a polygonal shape.
3. The method of manufacturing a recording tape cartridge of claim 1 , wherein the engaging member comprises a cross-shaped rib.
4. The method of manufacturing a recording tape cartridge of claim 3 , wherein the insertion groove is substantially cross-shaped in a plan view.
5. The method of manufacturing a recording tape cartridge of claim 4 , wherein engagement of the cross-shaped rib with the insertion groove impedes rotation of the braking member with respect to the case.