Sheet transport apparatus

Details Sheet transport apparatus Sheet transport apparatus

1996-11-20

2000-03-07

Ellis, Christopher P.

Sheet feeding or delivering

Feeding

Separators

271188, 271272, B65H 352

Patent

active

060329459

ABSTRACT:
A sheet transport apparatus capable of applying a predetermined force for transporting any kind of paper, including a sheet of thin paper, without forming transport wrinkles in the paper caused by a nipping pressure. The apparatus includes a hard roller 114 and a soft roller 112 for nipping a sheet of paper 10 therebetween. The soft roller is driven to transport the sheet using a frictional force generated from the nipping pressure applied by the soft and hard rollers. The hard roller is in a barrel-shape having a predetermined radial curvature "R", such that the nipping pressure decreases gradually along its axis from the center toward the periphery of a nipping face between two rollers. This causes a compressive stress against the sheet to shift smoothly from a portion of the sheet nipped by the soft and hard rollers to a portion free from the nipping pressure. Thus, the formation of transport wrinkles in the sheet can be prevented.

REFERENCES:
patent: 4188025 (1980-02-01), Gusfafson et al.
patent: 4302002 (1981-11-01), Hashimoto
patent: 4438918 (1984-03-01), Ito et al.

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