Sheet feeding apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHiroshi Hiura, Takeshi Suga, Toshifumi Itabashi, Hajime Sekiguchi
Life of this patent
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Abstract
Sheets fed out of a cassette supporting the sheets by a pickup roller are separated and fed by a sheet separation feeding unit having a feed roller and a separating roller which is rotatable in a direction opposite to a sheet feeding direction. A charge eliminating mechanism for eliminating charges of the separating roller is arranged on the upstream side in the sheet feeding direction in a separation nip portion between the feed roller and the separating roller.
Claims10
A sheet feeding apparatus comprising a sheet separation feeding unit which separates and feeds sheets supported in a sheet supporting unit, the sheet separation feeding unit comprising:
- a feed roller which feeds out the sheets in a sheet feeding direction;
- a separating roller which is rotatable in a direction opposite to the sheet feeding direction and separates the sheets one by one by a separation nip portion which is formed between the separating roller and the feed roller;
- and
- a charge eliminating mechanism which is provided on an upstream side in the sheet feeding direction in the separation nip portion and eliminates charges of the separating roller,
- wherein the charge eliminating mechanism has a guide member which guides the sheets supported in the sheet supporting unit toward the separation nip portion;
- and
- the guide member comprises a flexible conductive sheet, and the guide member is arranged in contact with a surface of the separating roller or is arranged in contact with a surface of the separating roller or is arranged with a predetermined gap, and is connected to a ground, thereby eliminating the charges of the separating roller through the guide member.
A sheet feeding apparatus comprising a sheet separation feeding unit which separates and feeds sheets supported in a sheet supporting unit, the sheet separation feeding unit comprising:
- a feed roller which feeds out the sheets in a sheet feeding direction;
- a separating roller which is rotatable in a direction opposite to the sheet feeding direction and separates the sheets one by one by a separation nip portion which is formed between the separating roller and the feed roller;
- and
- a charge eliminating mechanism which is provided on an upstream side in the sheet feeding direction in the separation nip portion and eliminates charges of the separating roller,
- wherein the charge eliminating mechanism has a guide member which guides the sheets supported in the sheet supporting unit toward the separation nip portion;
- and
- the guide member has a conductivity, is arranged in contact with a surface of the separating roller or is arranged with a predetermined gap, and is connected to a ground, thereby eliminating the charges of the separating roller through the guide member, and
- wherein the guide member comes into plane contact with an outer periphery of the separating roller.
An image forming apparatus comprising a sheet separation feeding unit which separates and feeds sheets supported in a sheet supporting unit and an image forming unit which forms an image onto the sheet fed out of the sheet separation feeding unit, the sheet separation feeding unit comprises:
- a feed roller which feeds out the sheets in a sheet feeding direction;
- a separating roller which is rotatable in a direction opposite to the sheet feeding direction and separates the sheets one by one by a separation nip portion which is formed between the separating roller and the feed roller;
- and
- a charge eliminating mechanism which is provided on an upstream side in the sheet feeding direction in the separation nip portion and eliminates charges of the separating roller,
- wherein the charge eliminating mechanism has a guide member which guides the sheets supported in the sheet supporting unit toward the separation nip portion;
- and
- the guide member comprises a flexible conductive sheet, and the guide member is arranged in contact with a surface of the separating roller or is arranged with a predetermined gap, and is connected to a ground, thereby eliminating the charges of the separating roller through the guide member.
An image forming apparatus comprising a sheet separation feeding unit which separates and feeds sheets supported in a sheet supporting unit and an image forming unit which forms an image onto the sheet fed out of the sheet separation feeding unit, the sheet separation feeding unit comprising:
- a feed roller which feeds out the sheets in a sheet feeding direction;
- a separating roller which is rotatable in a direction opposite to the sheet feeding direction and separates the sheets one by one by a separation nip portion which is formed between the separating roller and the feed roller;
- and
- a charge eliminating mechanism which is provided on an upstream side in the sheet feeding direction in the separation nip portion and eliminates charges of the separating roller,
- wherein the charge eliminating mechanism has a guide member which guides the sheets supported in the sheet supporting unit toward the separation nip portion;
- and
- the guide member has a conductivity, is arranged in contact with a surface of the separating roller or is arranged with a predetermined gap, and is connected to a ground, thereby eliminating the charges of the separating roller through the guide member, and
- wherein the guide member comes into plane contact with an outer periphery of the separating roller.
Dependencies are inferred from the claim text.