Magnetic tape cartridge with rotatably-mounted multi-projection brake release member
View Patent ↗A magnetic tape cartridge includes a cartridge casing and a single reel which is contained in the cartridge casing for rotation. The reel has a reel hub in the form of a cylindrical member which has a bottom wall and is provided with an opening and a stopper gear formed on the bottom wall. A brake member is provided with a brake gear and is movable up and down between an operative position where the brake gear is brought into engagement with the stopper gear to prevent rotation of the reel and a retracted position where the brake gear is disengaged from the stopper gear to permit rotation of the reel. The brake member is normally urged toward the operative position and moved to the retracted position by a pusher member of a tape drive system which acts on the brake member through the opening in the reel hub when the magnetic tape cartridge is loaded in the tape drive system. A continuous wall portion is erected around the opening in the reel hub, and the brake member includes a horizontal portion and a continuous skirt portion which extends downward from the horizontal portion and is in contact with the continuous wall portion of the reel hub to close the opening together with the horizontal portion. The brake member is moved between the operative position and the retracted position with the skirt portion kept in contact with the continuous wall portion of the reel hub.
1. A magnetic tape cartridge, comprising:
(a) a cartridge casing;
(b) a tape reel which is contained within the cartridge casing and which is configured to rotate within the cartridge casing;
(c) a brake assembly which is movable between an operative state that prevents rotation of the tape reel and a non-operative state that permits rotation of the tape reel, wherein the brake assembly includes:
(i) a non-rotatable brake member, and
(ii) a brake release member which is rotatably coupled with the tape reel and which is movable along a direction that extends from the tape reel toward the non-rotatable brake member, the brake release member defining a set of projections that extend in the direction from the tape reel toward the non-rotatable brake member in order to push the non-rotatable member such that the brake assembly moves between the operative state and the non-operative state.
2. The magnetic tape cartridge of claim 1 , wherein the non-rotatable brake member defines a spherically-shaped recess, and wherein the set of projections has a spherically-shaped projection that abuts the spherically-shaped recess defined by the non-rotatable brake member.
3. The magnetic tape cartridge of claim 2 , wherein the spherically-shaped projection of the set of projections resides at an axis of rotation of the brake release member, and wherein the spherically-shaped recess defined by the non-rotatable brake member resides at the axis of rotation of the brake release member.
4. The magnetic tape cartridge of claim 3 , wherein the set of projections further includes a set of annular protrusions which extends in the direction from the tape reel toward the non-rotatable brake member.
5. The magnetic tape cartridge of claim 4 , wherein the set of annular protrusions defines a set of slits to gather wear tailings generated during rotation of the tape reel.
6. The magnetic tape cartridge of claim 1 , wherein the set of projections includes a set of annular protrusions which extends in the direction from the tape reel toward the non-rotatable brake member.
7. The magnetic tape cartridge of claim 6 , wherein the set of annular protrusions defines a set of slits to gather wear tailings generated during rotation of the tape reel.
8. The magnetic tape cartridge of claim 1 , wherein the brake release member is formed of fiber reinforced resin.
9. The magnetic tape cartridge of claim 8 , wherein the fiber reinforced resin is long-fiber reinforced resin.
10. The magnetic tape cartridge of claim 8 , wherein the fiber reinforced resin is carbon fiber reinforced resin.
11. The magnetic tape cartridge of claim 1 , wherein at least one of the brake release member and the brake member is formed of synthetic resin.
12. The magnetic tape cartridge of claim 11 , wherein the synthetic resin includes a lubricant.
13. The magnetic tape cartridge of claim 12 , wherein the lubricant is one of a group consisting of molybdenum, polytetrafluoroethylene, graphite, potassium titanate whisker, and silicone formed of dimethyl polysiloxane.
14. A magnetic tape cartridge, comprising:
(a) a cartridge casing;
(b) a tape reel which is contained within the cartridge casing and which is configured to rotate within the cartridge casing;
(c) a brake assembly which is movable between an operative state that prevents rotation of the tape reel and a non-operative state that permits rotation of the tape reel, wherein the brake assembly includes:
(i) a non-rotatable brake member, and
(ii) a brake release member which is rotatably coupled with the tape reel and which is movable along a direction that extends from the tape reel toward the non-rotatable brake member, the brake release member defining a set of projections that extend in the direction from the tape reel toward the non-rotatable brake member, the set of projections including means for abutting the non-rotatable member such that the brake assembly moves between the operative state and the non-operative state.
15. The magnetic tape cartridge of claim 14 , wherein the set of projections further includes means for gathering wear tailings generated during rotation of the tape reel.
16. The magnetic tape cartridge of claim 14 , wherein at least one of the non-rotatable brake member and the brake release member includes means for lubricating a contact between the non-rotatable brake member and the brake release member.