Abstract: An ink cassette comprises a supply bobbin, a winding bobbin, and an enclosure including a supply bobbin storage portion and a winding bobbin storage portion. In the supply bobbin storage portion and the winding bobbin storage portion, an opening is provided in one side surface of the enclosure, with an elastic piece provided within each of the openings, and a rotation restricting portion is provided on an inner side of another side surface of the enclosure. The supply bobbin and the winding bobbin has a rotation-restricted portion. The supply bobbin and the winding bobbin are biased by the elastic pieces toward the other side surface in which the rotation restricting portions are provided, and the rotation-restricted portions engage with the rotation restricting portions and restrict rotation of the supply bobbin and the winding bobbin.

Abstract: A tape tension controlling mechanism of a magnetic recording/reproducing apparatus for controlling a tension of a magnetic tape includes: a reel bed; a reel bed drum; a tension post; a tension arm rotatably supported by a tension arm shaft; an urging element; a tension band having an engagement portion; and a band fixing screw having a threaded portion at one end thereof and a head portion at the other end, the band fixing screw further having, between the threaded portion and the head portion, an intermediate shaft portion for engagement with the engagement portion of the tension band, wherein a longitudinal center line of the intermediate shaft portion is shifted from the longitudinal center line of the threaded portion, and a pitch P of a thread of the threaded portion and a longitudinal length L of the intermediate shaft portion have a relationship of L>P/2.