The invention herein discloses a separable web or ribbon container wherewith the web or ribbon remains within the separated container halves so that additions to or deletions from the web may be made without removing the spools on which the web is wound for transport back and forth between the halves.

A magnetic tape cassette comprises a tape running plane for a magnetic tape provided in the front of the casing assembly consisting of an upper half casing and a lower half casing, said magnetic tape being held in wound form and being capable of running inside the casing assembly and a front cover mounted to the casing assembly so as to open and close at the front of the assembly, said front cover being actuated by spring action in the direction closing the front part of the casing assembly by positioning one end of a coil spring fitted to the pivot pin in a rectangular groove formed in an inner surface of the upper half casing, wherein a rib having a slanted surface which is lowered toward said groove is provided at the side of said groove.

A tape cassette comprises a cover for covering a wound tape which comprises a polar member mounted on a wall of the cover and a coil spring fitted to the polar member. The polar member has a narrow width slit at the free end and a wide width slit adjacent to the narrow width slit at the side of the fixed end and one end of the coil spring is inserted in to the wide width slit through the narrow width slit and the other end of the coil spring is contacted with a case body.

This invention relates to an ink ribbon box, and more particularly, to an ink ribbon box to be used in small printers. The ink ribbon box has two ink ribbon roll receiving cylinders that extend parallel to each other and which are connected at their outer ends through bridging flanges.

A tape cassette dust door polar member, a dust door spring assembly and a related method for manufacturing and assembling the dust door spring assembly. The dust door polar member has a fixed end and a rounded free end. The rounded free end has a wide slit and a narrower slit extending therefrom toward the fixed end. The dust door spring assembly comprises this polar member and a spring having a short first leg and a long second leg angled relative to each other. The short first leg of the spring is positioned within the second slit of the polar member and the second leg of the spring is urged against the dust door to effect torsion of the spring. In the method of assembly, the wide and narrow slits of the dust door polar member sequentially receive the first short leg of the spring and twist the spring in a clockwise direction, to urge the second long leg against the dust door to effect torsion. This dust door polar member, dust door spring assembly and method for manufacturing and assembling the dust door spring assembly provide more efficient production and automated assembly of tape cassettes.