US Patent No. 9,284,138

SHEET FEEDING APPARATUS, IMAGE READING DEVICE AND IMAGE FORMING APPARATUS


Patent No. 9,284,138
Issue Date March 15, 2016
Title Sheet Feeding Apparatus, Image Reading Device And Image Forming Apparatus
Inventorship Takeshi Hino, Abiko (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,284,138

1. A sheet feeding apparatus comprising:
a conveying roller pair configured to convey a sheet;
a discharge roller pair including a driving discharge roller configured to normally rotate and discharge the sheet out of
the apparatus and to reversely rotate and convey again the sheet that has been once passed through the conveying roller pair
toward the conveying roller pair, and a driven discharge roller configured to rotate by being driven by the driving discharge
roller;

a driving source; and
a separating mechanism configured to contact the driven discharge roller with the driving discharge roller and separate the
driven discharge roller from the driving discharge roller by switching input rotations generated by the driving source to
normal and reverse rotations, the separating mechanism including:

a support portion rotatably supporting the driven discharge roller;
a swing mechanism configured to swing the support portion by receiving a driving force from the driving source and separate
the driven discharge roller from the driving discharge roller;

a planetary gear mechanism provided within a power transmission path from the driving source to the swing mechanism and including
first and second rotary components; and

a switching portion switching the planetary gear mechanism to a transmission state in which a power of the driving source
is transmitted from the driving source to the swing mechanism and to a cutoff state in which the transmission of the power
from the driving source to the swing mechanism is cut off, the switching portion including:

a moving member including a first locking portion locking the first rotary component and putting the planetary gear mechanism
in the transmission state, and a second locking portion locking the second rotary component and putting the planetary gear
mechanism into the cutoff state; and

a solenoid switching the planetary gear mechanism to the transmission state and to the cutoff state by moving the moving member.