Image forming machine with transfer roller

Details Image forming machine with transfer roller Image forming machine with transfer roller

1997-11-14

1999-02-02

Grimley, Arthur T.

Electrophotography

Document handling

Copy

399314, 399316, G03G 1500

Patent

active

058677615

ABSTRACT:
An image forming machine having a transfer roller comprises a rotatably disposed photoconductor drum, a transfer roller disposed opposite the photoconductor drum with a predetermined gap provided therebetween, a register roller pair for feeding a transfer sheet toward a transfer area where the photoconductor drum and the transfer roller are opposed to each other, transfer sheet guide means disposed between the register roller pair and the transfer area, and a fixing roller pair for fixing a toner image transferred to the transfer sheet passing through the transfer area. The transfer sheet guide means comprises an inner guide plate and an outer guide plate, and the inner guide plate has a linear guide portion extending toward a predetermined position on the peripheral surface of the photoconductor drum. The predetermined position is set in an angular range (.theta.) covering 12.degree. to 23.degree. upstream, in the direction of rotation of the photoconductor drum, from a line connecting the center of rotation of the photoconductor drum to the center of rotation of the transfer roller, while the linear guide portion of the inner guide plate forms an angle (.alpha.) with a tangent to the photoconductor drum at the predetermined position, the angle (.alpha.) being set at 19.degree. to 30.degree..

REFERENCES:
patent: 4260242 (1981-04-01), Nishikawa
patent: 4396273 (1983-08-01), Matsuyama et al.
patent: 5406360 (1995-04-01), Asai
patent: 5489974 (1996-02-01), Kamaji et al.
patent: 5633703 (1997-05-01), Takenouchi et al.
patent: 5739900 (1998-04-01), Isobe

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