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US 9,561,922 B2Granted
Sheet feeding device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Hiratsuka, Takaaki Aoyagi, Takeshi Aoyama, Yasumi Yoshida
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Abstract
Provided is a sheet feeding device and an image forming apparatus capable of performing sheet feeding by electrostatic adsorption at a low noise with a simple configuration. A first outer nip conveying roller 201b and a second outer nip conveying roller 202b that nip an adsorbing member 200 supported in a state an inside is loose by a first inner nip conveying roller 201a and a second inner nip conveying roller 202b are provided.
Claims14
A sheet feeding device, comprising:
- a loading unit that loads a sheet;
- a first rotating member that is arranged above the loading unit;
- a second rotating member that is arranged upstream in a sheet feed direction of the first rotating member;
- an adsorbing member in which an inside is supported in a loose state by the first rotating member and the second rotating member and electrically adsorbs the sheet loaded on the loading unit;
- a first nip member that, together with the first rotating member, nips the adsorbing member;
- a second nip member that, together with the second rotating member, nips the adsorbing member;
- a driving unit that rotates the first rotating member, the first nip member, the second rotating member, and the second nip member;
- a power source that applies a voltage to the adsorbing member and provides adsorption force of adsorbing the sheet by static electricity;
- and
- a control unit configured to control the driving unit,
- wherein the control unit causes the sheet loaded on the loading unit to be adsorbed on the adsorbing member by increasing a downward looseness amount of the adsorbing member and then feeds the sheet adsorbed on the adsorbing member while reducing the downward looseness amount of the adsorbing member,
- wherein a distance between the first rotating member and the sheet loaded on the loading unit is larger than a distance between the second rotating member and the sheet loaded on the loading unit,
- wherein two electrodes are arranged in the adsorbing member and the power source includes a first power source that applies a positive voltage to one of the two electrodes and a second power source that applies a negative voltage to the other of the two electrodes, and
- wherein a conducting portion is formed in at least one of the first nip member and the second nip member, one of the first power source and the second power source is connected to one of the two electrodes of the adsorbing member through the conducting portion, and the other of the first power source and the second power source is connected to the other of the two electrodes of the adsorbing member through the conducting portion.
11 more elements
A sheet feeding device, comprising:
- a loading unit that loads a sheet;
- a first rotating member that is arranged above the loading unit;
- a second rotating member that is arranged in an upstream further than the first rotating member in a sheet feed direction;
- an adsorbing member that includes one end side fixed to the first rotating member and the other end side fixed to the second rotating member, and electrically adsorbs the sheet loaded on the loading unit;
- a first driving unit that is able to rotate the first rotating member positively and reversely;
- a second driving unit that is able to rotate the second rotating member positively and reversely;
- and
- a control unit that controls the first driving unit and the second driving unit,
- wherein the control unit causes the sheet loaded on the loading unit to be adsorbed on the adsorbing member by increasing a downward looseness amount of the adsorbing member, and then feeds the sheet adsorbed on the adsorbing member while reducing the downward looseness amount of the adsorbing member, and
- the control unit returns the adsorbing member to a standby position by rotating the first rotating member and the second rotating member reversely after the sheet is fed.
7 more elements
An image forming apparatus, comprising:
- an image forming portion that forms an image on a sheet;
- a loading unit that loads a sheet;
- a first rotating member that is arranged above the loading unit;
- a second rotating member that is arranged in an upstream further than the first rotating member in a sheet feed direction;
- an adsorbing member in which an inside is supported in a loose state by the first rotating member and the second rotating member and electrically adsorbs the sheet loaded on the loading unit;
- a first nip member that nips the adsorbing member together with the first rotating member;
- a second nip member that nips the adsorbing member together with the second rotating member;
- a driving unit that rotates the first rotating member, the first nip member, the second rotating member, and the second nip member;
- a power source that applies a voltage to the adsorbing member and provides adsorption force of adsorbing the sheet by static electricity;
- and
- a control unit configured to control the driving unit,
- wherein the control unit causes the sheet loaded on the loading unit to be adsorbed on the adsorbing member by increasing a downward looseness amount of the adsorbing member and the feeds the sheet adsorbed on the adsorbing member while reducing the downward looseness amount of the adsorbing member,
- wherein a distance between the first rotating member and the sheet loaded on the loading unit is larger than a distance between the second rotating member and the sheet loaded on the loading unit,
- wherein two electrodes are arranged in the adsorbing member and the power source includes a first power source that applies a positive voltage to one of the two electrodes and a second power source that applies a negative voltage to the other of the two electrodes, and
- wherein a conducting portion is formed in at least one of the first nip member and the second nip member, one of the first power source and the second power source is connected to one of the two electrodes of the adsorbing member through the conducting portion, and the other of the first power source and the second power source is connected to the other of the two electrodes of the adsorbing member through the conducting portion.
12 more elements
Dependencies are inferred from the claim text.