US 9,272,860 B2Granted

Sheet feeding apparatus, image reading apparatus, and image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorKazuya Maehara

Life of this patent

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Abstract

A sheet feeding apparatus, in which a feeding roller can take a feeding and retracted positions through a simple configuration, and an image reading apparatus, and an image forming apparatus including the same. The sheet feeding apparatus includes an original stack tray, a pickup roller, a pickup arm, a separation shaft of a separation roller which is connected to the pickup roller and rotates the pickup arm, a driving motor which is connected to the shaft, and a weight member which is supported to the pickup arm on a side opposite to the pickup roller. When the driving motor is driven, the pickup arm is rotated to a feeding position to feed an original. When transmission of a driving to the shaft is blocked, the pickup roller is rotated to a retracted position by the weight member.

Claims15

Dependent claims

A sheet feeding apparatus comprising:

a sheet stacking portion in which a sheet is stacked;
a feeding roller which feeds the sheet stacked in the sheet stacking portion;
a pickup arm which supports the feeding roller such that the feeding roller is movable between a feeding position abutting against the sheet stacked in the sheet stacking portion and a retracted position spaced apart from the feeding position;
a driving rotational shaft which is connected to the feeding roller and rotates the pickup arm;
a driving portion which drives the driving rotational shaft;
a weight member which is supported to the pickup arm on a side opposite to the feeding roller with respect to the driving rotational shaft;
and
a biasing member which abuts against the weight member or the pickup arm in a state in which the feeding roller is moved to the feeding position,
wherein when the driving rotational shaft is driven by the driving portion, the pickup arm is rotated and the feeding roller feeds the sheet at the feeding position,
wherein when a driving from the driving portion to the driving rotational shaft is stopped, the pickup arm is rotated by the weight member and the feeding roller is moved to the retracted position, and
wherein when transmission of a driving from the driving portion to the driving rotational shaft is stopped, the weight member is biased by the biasing member to rotate the pickup arm, and the feeding roller is moved to the retracted position.

8 more elements

An image reading apparatus comprising:

an image reading portion which reads an image of a sheet;
and
a sheet feeding apparatus which feeds the sheet to a predetermined image reading position with respect to the image reading portion, the sheet feeding apparatus including:
(a) a sheet stacking portion in which a sheet is stacked;
(b) a feeding roller which feeds the sheet stacked in the sheet stacking portion;
(c) a pickup arm which supports the feeding roller such that the feeding roller is movable between a feeding position abutting against the sheet stacked in the sheet stacking portion and a retracted position spaced apart from the feeding position;
(d) a driving rotational shaft which is connected to the feeding roller and rotates the pickup arm;
(e) a driving portion which drives the driving rotational shaft;
(f) a weight member which is supported to the pickup arm on a side opposite to the feeding roller with respect to the driving rotational shaft;
and
(g) a biasing member which abuts against the weight member or the pickup arm in a state in which the feeding roller is moved to the feeding position,
wherein when the driving rotational shaft is driven by the driving portion, the pickup arm is rotated and the feeding roller feeds the sheet at the feeding position,
wherein when a driving from the driving portion to the driving rotational shaft is stopped, the pickup arm is rotated by the weight member and the feeding roller is moved to the retracted position, and
wherein when transmission of a driving from the driving portion to the driving rotational shaft is stopped, the weight member is biased by the biasing member to rotate the pickup arm, and the feeding roller is moved to the retracted position.

11 more elements

An image forming apparatus comprising:

an image reading portion which reads an image of a sheet;
an image forming portion which is capable of forming the image read by the image reading portion on a sheet;
and
a sheet feeding apparatus which feeds the sheet to a predetermined image reading position with respect to the image reading portion, the sheet feeding apparatus including:
(a) a sheet stacking portion in which a sheet is stacked;
(b) a feeding roller which feeds the sheet stacked in the sheet stacking portion;
(c) a pickup arm which supports the feeding roller such that the feeding roller is movable between a feeding position abutting against the sheet stacked in the sheet stacking portion and a retracted position spaced apart from the feeding position;
(d) a driving rotational shaft which is connected to the feeding roller and rotates the pickup arm;
(e) a driving portion which drives the driving rotational shaft;
(f) weight member which is supported to the pickup arm on a side opposite to the feeding roller with respect to the driving rotational shaft;
and
(g) a biasing member which abuts against the weight member or the pickup arm in a state in which the feeding roller is moved to the feeding position,
wherein when the driving rotational shaft is driven by the driving portion, the pickup arm is rotated and the feeding roller feeds the sheet at the feeding position,
wherein when a driving from the driving portion to the driving rotational shaft is stopped, the pickup arm is rotated by the weight member and the feeding roller is moved to the retracted position, and
when transmission of a driving from the driving portion to the driving rotational shaft is stopped, the weight member is biased by the biasing member to rotate the pickup arm, and the feeding roller is moved to the retracted position.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/482,268Filed 10 Sep 2014
Priority: JP 2013-20129727 Sep 2013
Published: US 2015/0091244 A12 Apr 2015
Granted: 1 Mar 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B65H 3/0684
Rollers or like rotary separators: on moving support, e.g. pivoting, for bringing the roller or like rotary separator into contact with the pile
B65H 3/0607
Rollers or like rotary separators: cooperating with means for automatically separating the pile from roller or rotary separator after a separation…
B65H 3/0669
Rollers or like rotary separators: driving devices therefor
B65H 2403/723
Clutches, brakes, e.g. one-way clutch +F204: wrap spring clutches