Abstract: A disc drive device includes a base, a rotary member rotatably supported on the base and a first chucking mechanism for holding a first kind of disc-shaped recording medium while coinciding a rotational center of the first kind of recording medium with a rotational center of the rotary member. The first chucking mechanism is arranged at one end of the rotary member. A second chucking mechanism holds a second kind of disc-shaped recording medium different from the first kind of recording medium with respect to size or disc formatting while coinciding a rotational center of the second kind of recording medium with a rotational center of the rotary member. The second chucking mechanism is arranged at the other end of the rotary member. A driving mechanism is mounted on the base for driving the rotary member.

Abstract: A magnetic recording/reproducing unit comprises a magnetic head for recording or reproducing information on or from a magnetic recording medium, a pushing member provided opposite the magnetic head via the magnetic recording medium for pushing the magnetic recording medium to the magnetic head, a housing for accommodating the magnetic head, and an elastic member arranged between the magnetic head and the housing for elastically supporting the magnetic head. Even if the pushing member collides with the magnetic head via the magnetic recording medium in the recording or reproducing mode, the shock of the collision is absorbed and a spacing loss between the magnetic head and the magnetic recording medium is suppressed.

Abstract: There is disclosed an integrated cylindrical formation of plural lines of a printing type belt in such a printing type drum as contains a hammer unit therein, has plural lines of printing type belts installed round the periphery of the cylindrically formed drum body and supplied printing ink to the types by pressing an ink roller against the printing type belts.

Abstract: This invention provides, in a printing wheel having an internal hammer, a new structure of the typefont belt and a mounting method therefor on the support member. Also a structure of the printing drum and a driving method therefor suitable for intermittent rotation and stop by a stepping motor are disclosed.

Abstract: This invention relates to a typefont belt and a typefont wheel for use in the small printer. The typefont belt made, for example of rubber, is fitted around a cylindrical support to compose the typefont wheel and is struck by a printing hammer provided in the support to perform printing on the printing sheet.