Sheet feeding device
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsTakamitsu Kawai, Koji Takito, Yukio Shiohara, Takatoshi Takemoto, Hiroshi Suzuki, Tetsuya Ouchi
Life of this patent
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Abstract
There is provided a sheet feeding device, which is provided with a paper supply member which feeds a sheet of paper on the top of stack of paper, the paper supply member being actuated by an actuator. The sheet feeding device further provided with a control system which controls the paper supply member, the control system having a stable sheet feeding operation mode in which the control system drives the paper supply member for a first time period initially, then stops the paper supply member after the first time period terminates, and then drives the paper supply member for a second time period.
Claims20
A sheet feeding device which feeds a stack of sheets one by one along a sheet feed path, comprising:
- a sheet driving member that separates and drives one sheet of the stack of sheets in the sheet feed direction;
- and
- a control system that controls the sheet driving member to move the one sheet at least in a first mode that is followed by a second mode, the control system controlling the sheet driving member to move the one sheet at a first speed in the first mode, and to move the one sheet at a second speed in the second mode, the first speed being slower than the second speed,
- wherein a predetermined stop time is provided between the first mode and the second mode, and the
- sheet driving member stops moving the one sheet during the predetermined stop time.
A sheet feeding device which feeds a stack of sheets one by one along a sheet feed path, comprising:
- a sheet driving member that separates and drives one sheet of the stack of sheets in the sheet feed direction;
- and
- a control system that controls the sheet driving member to move the one sheet at least in a first mode that is followed by a second mode, the control system controlling the sheet driving member to move the one sheet at a first speed in the first mode, and to move the one sheet at a second speed in the second mode, the first speed being slower than the second speed wherein at least one of the first and second speed is changed in accordance with a thickness of the sheet to be fed.
A sheet feeding device which feeds a stack of sheets one by one along a sheet feed path, comprising:
- a sheet driving member that separates and drives one sheet of the stack of sheets in the sheet feed direction;
- and
- a control system that controls the sheet driving member to move the one sheet at least in a first mode that is followed by a second mode, the control system controlling the sheet driving member to move the one sheet at a first speed in the first mode, and to move the one sheet at a second speed in the second mode, the first speed being slower than the second speed;
- and
- a separating plate located on a downstream side, with respect to a sheet feed direction of the stack of sheets, leading ends of the stack of sheets being abutted against a surface of the separating plate, the surface of the separating plate having a rough surface, wherein the one sheet is a top sheet of the stack of sheets, the sheet driving member contacting the top sheet of the stack of sheets, the sheet driving member being driven to move the top sheet in the sheet feed direction.
A sheet feeding device which feeds a stack of sheets one by one along a sheet feed path, comprising:
- a sheet driving member that separates and drives one sheet of the stack of sheets in the sheet feed direction;
- and
- a control system that controls the sheet driving member to move the one sheet from a stacked position to a predetermined registration position, the control system being selectively operated in a first feeding mode and a second feeding mode, wherein the control system controls the driving member to move the one sheet in a first mode that is followed by a second mode when the first feeding mode is selected, the control system controlling, in the first feeding mode, the sheet driving member to move the one sheet at a first speed in the first mode and to move the one sheet at a second speed in the second mode, the first speed being slower than the second speed, and the control system controls the driving member substantially at a constant speed in the second feeding mode.
A sheet feeding device which feeds a stack of sheets one by one along a sheet feed path, comprising:
- a sheet driving member that separates and drives one sheet of the stack of sheets in the sheet feed direction;
- and
- a control system that controls the sheet driving member to move the one sheet from a stacked position to a predetermined registration position, the control system being selectively operated in a first feeding mode and a second feeding mode, wherein the control system controls the driving member to move the one sheet in a first mode that is followed by a second mode when the first feeding mode is selected, the control system controlling, in the first feeding mode, the sheet driving member to move the one sheet at a first speed in said first mode and to move the one sheet at a second speed in said second mode, the first speed being slower than the second speed, and
- the control system controls the driving member to move the one sheet in a third mode that is followed by a fourth mode when the second feeding mode is selected, and
- the control system controls, in the second feeding mode, the sheet driving member to move the one sheet at a third speed in the third mode, and the sheet driving member to move the one sheet at a fourth speed in the fourth mode.
A method of feeding a stack of sheets one by one from the stack to a predetermined registration position along a sheet feed path of a sheet feeding device, comprising:
- driving one sheet of the stack of sheets in the sheet feed direction to a position upstream of the predetermined registration position at a first speed;
- stopping the movement of the one sheet for a predetermined period of time;
- and
- driving the one sheet in the sheet feed direction to the predetermined registration position at a second speed which is different from the first speed.
Dependencies are inferred from the claim text.