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US 2019/0161300 A1Published application
Image forming apparatus for forming image on sheet
AssigneeCanon Kabushiki Kaisha
InventorYohei Katto
Life of this patent
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Abstract
A first roller conveys a sheet conveyed from a reversal roller. A first motor drives the reversal roller and the first roller. A one-way clutch restricts transfer of a driving force from the first motor to the first roller while the reversal roller is conveying a sheet in a first direction, and permits transfer of a driving force from the first motor to the first roller while the reversal roller is conveying a sheet in a second direction. A second and third rollers are provided on a downstream side of the first roller. A second motor drives the second roller and the third roller. A controller drives both of the first and second motors when resuming conveyance of a sheet conveyed on a duplex conveyance path after causing the sheet to wait abutting the second roller.
Claims11
An image forming apparatus, comprising:
- a container unit configured to contain a sheet;
- an image forming unit configured to form an image on the sheet;
- and
- a discharge unit configured to discharge the sheet onto which the image was formed;
- a main conveyance path, on which a sheet is conveyed, from the container unit to the discharge unit via the image forming unit;
- an auxiliary conveyance path that divides from the main conveyance path, wherein a sheet to which an image has been formed on a first surface thereof is conveyed on the auxiliary conveyance path in order to form an image on a second surface of the sheet;
- a reversing and conveying path connected to the auxiliary conveyance path, wherein the sheet that has been conveyed from the auxiliary conveyance path is conveyed on the reversing and conveying path in order to reverse a conveyance direction of the sheet;
- a duplex conveyance path joined to the main conveyance path, wherein the sheet fed from the reversing and conveying path is conveyed on the duplex conveyance path in order to form the image on the second surface of the sheet;
- a registration roller provided in the main conveyance path, on a downstream side of a joining portion of the main conveyance path and the duplex conveyance path and on an upstream side of the image forming unit in the conveyance direction of the sheet;
- a reversal roller configured to pull the sheet to which the image is formed on the first surface into the reversing and conveying path by conveying the sheet in a first direction, and feed the sheet into the duplex conveyance path by conveying the sheet in a second direction opposite to the first direction;
- a first roller provided in the duplex conveyance path on a downstream side of a connection point between the reversing and conveying path and the duplex conveyance path, and configured to convey a sheet conveyed from the reversal roller;
- a first motor configured to drive the reversal roller and the first roller;
- a one-way clutch configured to restrict transfer of a driving force from the first motor to the first roller while the reversal roller is conveying a sheet in the first direction, and permit transfer of a driving force from the first motor to the first roller while the reversal roller is conveying a sheet in the second direction;
- a second roller provided in the duplex conveyance path and on a downstream side of the first roller in the conveyance direction of the sheet, and configured to convey the sheet;
- a third roller provided in the duplex conveyance path and on a downstream side of the second roller in the conveyance direction of the sheet, and configured to convey the sheet;
- a second motor configured to drive the second roller and the third roller;
- and
- a controller configured to control the first motor and the second motor so as to drive both of the first motor and the second motor when resuming conveyance of a sheet conveyed on the duplex conveyance path after causing the sheet to wait abutting the second roller.
15 more elements
An image forming apparatus, comprising:
- a container unit configured to contain a sheet;
- an image forming unit configured to form an image on the sheet;
- a discharge unit configured to discharge the sheet onto which the image was formed;
- a main conveyance path, on which a sheet is conveyed, from the container unit to the discharge unit via the image forming unit;
- a reversing and conveying path wherein the sheet that has been conveyed from the main conveyance path is conveyed on the reversing and conveying path to in order to reverse a conveyance direction of the sheet;
- a duplex conveyance path joined to the main conveyance path, wherein the sheet fed from the reversing and conveying path is conveyed on the duplex conveyance path in order to form an image on a second surface of the sheet;
- a rotary member provided in the main conveyance path, on a downstream side of a joining portion of the main conveyance path and the duplex conveyance path and on an upstream side of the image forming unit in the conveyance direction of the sheet;
- a reversal unit configured to pull the sheet to which the image is formed on the first surface into the reversing and conveying path by conveying the sheet in a first direction, and feed the sheet into the duplex conveyance path by conveying the sheet in a second direction opposite to the first direction;
- a first conveyance unit provided in the duplex conveyance path on a downstream side of a connection point between the reversing and conveying path and the duplex conveyance path, and configured to convey a sheet conveyed from the reversal unit;
- a first driving unit configured to drive the reversal unit and the first conveyance unit;
- a restricting unit configured to restrict transfer of a driving force from the first driving unit to the first conveyance unit while the reversal unit is conveying a sheet in the first direction, and permit transfer of a driving force from the first driving unit to the first conveyance unit while the reversal unit is conveying a sheet in the second direction;
- a second conveyance unit provided in the duplex conveyance path and on a downstream side of the first conveyance unit in the conveyance direction of the sheet, and configured to convey the sheet;
- a third conveyance unit provided in the duplex conveyance path and on a downstream side of the second conveyance unit in the conveyance direction of the sheet, and configured to convey the sheet;
- a second driving unit configured to drive the second conveyance unit and the third conveyance unit;
- and
- a controller configured to control the first driving unit and the second driving unit so as to drive both of the first driving unit and the second driving unit when resuming conveyance of a sheet conveyed on the duplex conveyance path after causing the sheet to wait at the second conveyance unit.
13 more elements
An image forming apparatus, comprising:
- an image forming unit configured to form an image on a sheet;
- a first rotary member configured to feed a sheet to which an image is formed on a first surface by the image forming unit to a conveyance path for forming an image on a second surface of the sheet;
- a second rotary member positioned downstream of the first rotary member in a conveyance direction of the conveyance, and configured to convey the sheet path;
- a third rotary member positioned downstream of the second rotary member in the conveyance direction of the conveyance path, and configured to convey the sheet;
- a fourth rotary member positioned downstream of the third rotary member in a conveyance direction of the conveyance path, and configured to convey the sheet;
- a first driving unit configured to drive the first rotary member and the second rotary member;
- a second driving unit configured to drive the third rotary member and the fourth rotary member;
- and
- a controller configured to control the first driving unit and the second driving unit so as to drive both of the first driving unit and the second driving unit when resuming conveyance of a sheet conveyed on the conveyance path after causing the sheet to wait at the third rotary member.
6 more elements
Dependencies are inferred from the claim text.