US 2006/0222403 A1Published application

Image forming apparatus

AssigneeMurata Machinery, Ltd.

InventorNaritoshi TAKAMATSU

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Abstract

An image forming apparatus includes an apparatus main body, a photoconductive drum, a transfer roller, a pair of guide supporting brackets, and an urging member. The guide supporting brackets include two paper transportation guides, and the brackets are mounted on both end portions of a drum shaft of the photoconductive drum in a manner capable of being swung about the drum shaft as a center. The paper transportation guides are arranged laterally at a predetermined interval therebetween on the guide supporting brackets. The urging member is provided in the apparatus main body. In a state in which the photoconductive drum is installed in the apparatus main body, swinging ends of the guide supporting brackets are pressed against the transfer roller by the urging member, and the paper transportation guides are positioned at a predetermined position in proximity of an upstream side of the nip portion in a paper transportation direction.

Claims19

Dependent claims

An image forming apparatus comprising:

an apparatus main body;
a photoconductive drum including a drum shaft, the photoconductive drum arranged removably in the apparatus main body;
a transfer roller arranged to contact the photoconductive drum to define a nip portion and transfer a toner image on a surface of the photoconductive drum onto paper introduced into the nip portion;
a pair of guide supporting brackets including two paper transportation guides, the pair of guide supporting brackets respectively mounted on end portions of the drum shaft so as to be capable of being swung about the drum shaft as a center, and the two paper transportation guides are arranged with a predetermined interval therebetween on the pair of the guide supporting brackets;
and
an urging member arranged in the apparatus main body such that, in a state in which the photoconductive drum is installed in the apparatus main body, swinging ends of the guide supporting brackets are pressed against the transfer roller by the urging member and the two paper transportation guides are positioned at a predetermined position in proximity of an upstream side of the nip portion in a paper transportation direction.

3 more elements

An apparatus main body comprising:

an installation section including a drum unit, the drum unit including a photoconductive drum, two paper transportation guides, and a pair of guide supporting brackets mounted on end portions of a drum shaft of the photoconductive drum so as to be capable of being swung about the drum shaft as a center, wherein the two paper transportation guides are arranged with a predetermined interval therebetween on the pair of the guide supporting brackets;
a transfer roller arranged to contact the photoconductive drum to define a nip portion and transfer a toner image on a surface of the photoconductive drum onto paper introduced into the nip portion;
and
an urging member arranged in the apparatus main body such that, in a state in which the photoconductive drum is installed in the apparatus main body, swinging ends of the guide supporting brackets are pressed against the transfer roller by the urging member and the two paper transportation guides are positioned at a predetermined position in proximity of an upstream side of the nip portion in a paper transportation direction.

1 more element

Dependencies are inferred from the claim text.