US Patent No. 9,284,141

SHEET FEEDING APPARATUS AND IMAGE FORMING APPARATUS


Patent No. 9,284,141
Issue Date March 15, 2016
Title Sheet Feeding Apparatus And Image Forming Apparatus
Inventorship Kazuhiro Kosuga, Abiko (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,284,141

1. A sheet feeding apparatus, comprising:
a sheet storage portion which includes a sheet stack tray which is swingable in an up-and-down direction;
a feeding roller which is arranged above the sheet stack tray and which feeds an uppermost sheet stacked on the sheet stack
tray;

a support member which is swingable in an up-and-down direction about a swing fulcrum and which supports the feeding roller
to be swingable at a swing end; and

a roller biasing member which applies a force to the support member in a direction in which the feeding roller is pressed
to the uppermost sheet stacked on the sheet stack tray; and

a separation roller, disposed downstream of the sheet stack tray in a sheet feeding direction, which is pressed against feeding
roller to form a separation portion with the feeding roller that separates sheets one by one, wherein

when the feeding roller presses to contact with the uppermost sheet stacked in the sheet storage portion, the sheet storage
portion is disposed so as that a downstream end in a sheet conveyance direction of the uppermost sheet is positioned adjacent
a lowest point of the feeding roller, and

a biasing direction of the roller biasing member is configured so that a contacting and pressing position between the sheet
and a peripheral surface of the feeding roller changes between both an upstream side and downstream side for the lowest point
of the feeding roller in the sheet conveyance direction according to a stacking amount of the sheet stacked in the sheet storage
portion.