Patent ID: 8262013

Claim:
A reel hub having a slot, formed on a main body part, into which a leader block is inserted, a beginning of a magnetic tape fixed by a reel pin to the leader block, the reel hub including: a lever which is rotatably supported by the main body part, the lever including one end protruded at a closed side of the slot and an other end extending to an open side of the slot; a first spring provided at the main body part, the first spring urging the one end of the lever to move toward the slot and the other end to move away from the slot; a lid member which is rotatably supported by the main body part, a tip end part of the lid member being urged to close the open side of the slot from outside, and a rear end part of the lid member being abuttable to the other end of the lever at an inner side of the rear end part; and a second spring provided at the main body part, the second spring urging the tip end part of the lid member to move toward the open side of the slot, wherein, when the leader block is inserted in the slot and a tip portion of the leader block is fixed to a center of the main body part in a manner that the reel hub becomes rotatable, the lever is pushed by the tip portion of the leader block to be rotated, wherein the one end of the lever moves rotationally towards a direction away from the slot, and the other end of the lever moves rotationally toward a direction close to the slot, and wherein an arc shape surface of the lid member forms a cylindrical tape take-up face together with a peripheral surface of the main body part.