Patent ID: 9272862
Filing Date: 2016-03-01
CPC Classification: B65H

Claim Text:
1. A sheet feeding device comprising: a sheet stacking portion on which sheets are stacked; a sheet feeding portion which abuts and feeds an uppermost sheet stacked in the sheet stacking portion; a support member which supports the sheet feeding portion and is rotatable in a vertical direction; a cam which holds the sheet feeding portion at a standby position separated from the uppermost sheet by upwardly rotating the support member and moves the sheet feeding portion to a feeding position abutting the uppermost sheet by downwardly rotating the support member; a motor which rotates the cam; a first detection portion which detects that the cam is located at an initial position holding the sheet feeding portion at the standby position; a registration portion which is arranged downstream of the sheet feeding portion in a sheet feeding direction, abuts a downstream end of the sheet fed by the sheet feeding portion in the sheet feeding direction in a stopped state, and feeds the sheet by being rotated at predetermined timing; a drive transfer portion which is set such that the sheet fed by the sheet feeding portion at the feeding position arrives at the registration portion by lifting and lowering the sheet feeding portion between the standby position and the feeding position in accordance with one rotation of the cam by the motor; a second detection portion which is disposed on an upstream side of the registration portion in the sheet feeding direction and detects when the sheet fed by the sheet feeding portion arrives at the registration portion; and a controller which stops the motor according to a detection result by the second detection portion and then performs a rotation control so as to rotate the motor again and to stop the motor according to a detection by the first detection portion, wherein when the rotation control is performed, the controller changes a rotating speed of the motor to a first speed or to a second speed which is smaller than the first speed according to a rotation angle θ, the rotation angle θ being a rotation angle of the cam formed in relation to the initial position when the controller stops the motor according to the detection result by the second detection portion, and wherein a rotation angle when the rotation control is performed at the first speed is larger than a rotation angle when the rotation control is performed at the second speed.