US 6,792,859 B2 · Rotating drum and image recording device

Abstract

A rotating drum in which, when the rotating drum is rotated at high speed, there is no offset between divisional drum parts, there is little imbalance, and a moment of inertia for rotation is small. A drum main body is divided into four drum parts whose cross-sectional configurations orthogonal to an axis are fan-shaped. Female projecting portions and male projecting portions are formed at a pitch dimension having a predetermined fit-together tolerance. Thus, the drum parts can be assembled together with a certain amount of leeway at a time of assembly. After the four drum parts have been assembled together, wires are press-fit in from an end surface side of the drum main body so as to tightly fasten the drum parts. Because the assembled drum main body defines configurations of the drum parts to have point symmetry, imbalance can be made small.

Claims26

Dependent claims

A drum rotatable around a drum axis, and having a drum main body on whose outer peripheral surface a sheet is wound and held, said drum comprising:

(a) a plurality of drum parts which are structured so as to divide the drum main body into plural parts in a peripheral direction, and which form the drum main body by being assembled together, and which can be separated from one another;
and
(b) joining elements which, at a time of assembling said drum, are positioned at borders of the drum parts which are adjacent, and which respectively extend parallel to the drum axis, and which are for joining the drum parts such that the drum parts can be separated from one another,
wherein a plurality of joining elements exist at one border, at least two of which are separated and oppose one another.

1 more element

Dependencies are inferred from the claim text.

Rotating drum and image recording device

Life of this patent

Rotating drum and image recording device

Life of this patent

Abstract

Claims26