Sheet feeding apparatus

Patent metadata

Field	Value
Publication number	US-9764570-B2
Application number	US-201615208812-A
Country	US
Kind code	B2
Filing date	Jul 13, 2016
Priority date	Jul 21, 2015
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A sheet feeding apparatus includes a first sheet storage portion and a second sheet storage portion disposed side by side with the first sheet storage portion. The sheet feeding device includes a sheet bundle moving member configured to transfer sheets in the second sheet storage portion to the first sheet storage portion and a pickup roller configured to feed the sheet by abutting against the sheet stored in the first sheet storage portion. When transferring the sheet bundle in the second sheet storage portion to the first sheet storage portion, the pickup roller is rotated in the same direction as that during feeding.

First claim

What is claimed is:

1. A sheet feeding apparatus comprising:
an apparatus body;
a first sheet storage portion configured to be movably provided to a mounting position and a pull-out position with respect to the apparatus body;
a second sheet storage portion disposed side by side with the first sheet storage portion and configured to be movably provided to the mounting position and the pull-out position with respect to the apparatus body;
a sheet transfer portion configured to transfer a sheet bundle stored in the second sheet storage portion to the first sheet storage portion when the first sheet storage portion and the second sheet storage portion are in the mounting position;
a rotator configured to feed a sheet by being rotated while abutting against the sheet stored in the first sheet storage portion in the same direction as a moving direction of the sheet transfer portion while transferring the sheet bundle stored in the second sheet storage portion to the first sheet storage portion;
a conveyance rotator provided downstream of the rotator in a sheet transferring direction and configured to convey the sheet fed by the rotator further downstream; and
a control portion configured to control the sheet transfer portion and the rotator, the control portion being configured to execute a mode of rotating the rotator in the same rotation direction as that during feeding the sheet when transferring the sheet bundle of the second sheet storage portion to the first sheet storage portion by the sheet transfer portion and stopping the rotator before a leading end of the uppermost sheet of the sheet bundle reaches the conveyance rotator even if the uppermost sheet comes into contact with the rotator.

2. The sheet feeding apparatus according to claim 1 , wherein the control portion causes the rotation of the rotator to be started before a leading end of the sheet bundle transferred by the sheet transfer portion reaches a position of the rotator in a sheet bundle transferring direction.

3. The sheet feeding apparatus according to claim 1 , further comprising a first detection portion configured to detect a timing for starting of the rotation of the rotator and a second detection portion configured to detect a timing for stopping the rotation of the rotator, the control portion controls the rotator to be rotated based on a detection result of the first detection portion and to be stopped based on a detection result of the second detection portion.

4. The sheet feeding apparatus according to claim 1 , wherein the control portion controls the sheet transfer portion and the rotator to satisfy a relationship of Vt≦Va, where a moving velocity of the sheet transfer portion is Vt, and a peripheral rotation speed of the rotator is Va when transferring the sheet bundle of the second sheet storage portion to the first sheet storage portion.

5. The sheet feeding apparatus according to claim 3 , further comprising a conveyance rotator configured to convey the sheet fed by the rotator further on a downstream side,
wherein a relationship of Ds≦Da is satisfied, where a distance between a rotation center of the rotator and a rotation center of the conveyance rotator is Da, and a distance between a detection portion of the first detection portion and a detection portion of the second detection portion is Ds, and
wherein the control portion controls Va and Vt when transferring the sheet bundle of the second sheet storage portion to the first sheet storage portion to satisfy a relationship of Vt≦Va and Ds/Vt<Da/Va, where a moving velocity of the sheet transfer portion is Vt and a peripheral rotation speed of the rotator is Va.

6. The sheet feeding apparatus according to claim 3 , wherein the first detection portion and the second detection portion are provided in a transferring path of the sheet transfer portion and the second detection portion is disposed downstream of the first detection portion in a sheet bundle transferring direction.

7. The sheet feeding apparatus according to claim 3 , wherein the first detection portion is configured to detect that the leading end of the sheet bundle transferred by the sheet transfer portion reaches a predetermined position.

8. The sheet feeding apparatus according to claim 3 , wherein the first detection portion is configured to detect the timing for starting the rotation of the rotator and detect a presence or absence of the sheet of the first sheet storage portion.

9. The sheet feeding apparatus according to claim 3 , wherein the first detection portion and/or the second detection portion detects a position of the sheet transfer portion.

10. The sheet feeding apparatus according to claim 1 , wherein the rotator is configured to be moved to a first position and a second position that is lower than the first position, wherein the rotator is located in the first position in a case in which the first sheet storage portion and the second sheet storage portion are in the pull-out position, and wherein the rotator is located in the second position in a case in which the first sheet storage portion and the second sheet storage portion are in the mounting position.

11. An image forming apparatus comprising:
an apparatus body;
a first sheet storage portion configured to be movably provided to a mounting position and a pull-out position with respect to the apparatus body;
a second sheet storage portion disposed side by side with the first sheet storage portion and configured to be movably provided to the mounting position and the pull-out position with respect to the apparatus body;
a sheet transfer portion configured to transfer sheets stored in the second sheet storage portion to the first sheet storage portion when the first sheet storage portion and the second sheet storage portion are in the mounting position;
a rotator configured to feed a sheet by being rotated while abutting against the sheet stored in the first sheet storage portion in the same direction as a moving direction of the sheet transfer portion while transferring the sheet bundle stored in the second sheet storage portion to the first sheet storage portion;
a conveyance rotator provided downstream of the rotator in a sheet transferring direction and configured to convey the sheet fed by the rotator further downstream; and
a control portion configured to control the sheet transfer portion and the rotator, the control portion being configured to execute a mode of rotating the rotator in the same rotation direction as that during feeding the sheet when transferring the sheets of the second sheet storage portion to the first sheet storage portion by the sheet transfer portion and stopping the rotator before a leading end of the uppermost sheet of the sheet bundle reaches the conveyance rotator even if the uppermost sheet comes into contact with the rotator; and
an image forming portion configured to form an image onto the sheet fed by the rotator.

12. The image forming apparatus according to claim 11 , wherein the image forming portion is a laser beam printer.

13. The image forming apparatus according to claim 11 , wherein the image forming portion is an ink jet printer.

14. A sheet feeding apparatus comprising:
an apparatus body;
a first sheet storage portion configured to be movably provided to a mounting position and a pull-out position with respect to the apparatus body;
a second sheet storage portion disposed side by side with the first sheet storage portion and configured to be movably provided to the mounting position and the pull-out position with respect to the apparatus body;
a sheet transfer portion configured to transfer a sheet bundle stored in

Assignees

• Canon Kk

Inventors

• Kondo Takashi

Classifications

• G03G15/6511

  Feeding devices for picking up or separation of copy sheets · CPC title

• G03G15/6502

  Supplying of sheet copy material; Cassettes therefor · CPC title

• B65H1/04 Primary

  adapted to support articles substantially horizontally, e.g. for separation from top of pile · CPC title

• G03G15/6547

  Shifting sets of sheets in the discharge tray · CPC title

• B41J17/02

  Feeding mechanisms · CPC title