Paper discharge device
AssigneeRiso Kagaku Corporation
InventorTetsunori Saito
Life of this patent
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Abstract
In an image forming apparatus, a paper discharge roller of a paper discharge unit has an upper roller as a driving roller and a lower roller as a driven roller. The lower roller has a nip roller which is fixed to a shaft and holds paper between the nip roller and the upper roller, and forming rollers having a diameter larger than that of the nip roller and arranged on both sides of the nip roller. Since a conveyance speed of the paper is constant, the number of revolutions of the forming roller having a large outer diameter is smaller than that of a nip roller having a small outer diameter. The friction between the forming roller and the paper is lower than that in conventional art. Attachment and accumulation of ink are suppressed, and inconvenience of contamination of the paper with ink upon paper discharge hardly occurs.
Claims5
A paper discharge device comprising:
- a paper discharge roller including an upper roller and a lower roller, one of which is a driving roller,
- wherein the lower roller has a nip roller, fixed to a shaft, that holds paper between the nip roller and the upper roller, and forming rollers, rotatable freely with respect to the shaft, having an outer diameter larger than that of the nip roller and arranged on two sides of the nip roller without contacting the upper roller, and
- wherein the upper roller and the lower roller hold and convey the paper such that the paper is formed in a predetermined shape and is discharged.
Dependencies are inferred from the claim text.