Sheet conveying device and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuzo Matsumoto
Life of this patent
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Abstract
A sheet conveying device which is capable of stably conveying a sheet, irrespective of the material of the sheet. A first conveying roller pair nips and conveys a sheet. A drive motor drives the first conveying roller pair. An encoder detects the rotational speed of the first conveying roller pair. A first nip pressure-adjusting unit controls the nip pressure of the first conveying roller pair, and a CPU controls the first nip pressure-adjusting unit according to a change in the rotational speed of the first conveying roller pair detected by the encoder during sheet conveyance.
Claims11
A sheet conveying device comprising:
- a conveying roller pair configured to nip and convey a sheet;
- a driving unit configured to drive said conveying roller pair;
- a rotational speed-detecting unit configured to detect a rotational speed of said conveying roller pair;
- a pressure control unit configured to control a nip pressure of said conveying roller pair;
- and
- a main control unit configured to control said pressure control unit according to a change in the rotational speed of said conveying roller pair detected by said rotational speed-detecting unit during sheet conveyance.
A sheet conveying device comprising:
- a conveying roller pair configured to nip and convey a sheet;
- a driving unit configured to drive said conveying roller pair;
- a rotational speed-detecting unit configured to detect a rotational speed of said conveying roller pair;
- and
- a main control unit configured to control a driving force of said driving unit according to a change in the rotational speed of said conveying roller pair detected by said rotational speed-detecting unit during sheet conveyance.
A sheet conveying device comprising:
- a conveying roller pair configured to nip and convey a sheet;
- a driving unit configured to drive said conveying roller pair;
- a rotational speed-detecting unit configured to detect a rotational speed of said conveying roller pair;
- and
- a main control unit configured to control a speed of said driving unit according to a change in the rotational speed of said conveying roller pair detected by said rotational speed-detecting unit during sheet conveyance.
A sheet conveying device comprising:
- a conveying roller pair configured to nip and convey a sheet;
- a driving unit configured to drive said conveying roller pair;
- a rotational speed-detecting unit configured to detect a rotational speed of said conveying roller pair;
- and
- a main control unit configured to perform control such that a type of a conveyable sheet is limited according to a change in the rotational speed of said conveying roller pair detected by said rotational speed-detecting unit during sheet conveyance.
An image forming apparatus comprising a sheet conveying device, wherein the sheet conveying device comprises:
- a conveying roller pair configured to nip and convey a sheet;
- a driving unit configured to drive said conveying roller pair;
- a rotational speed-detecting unit configured to detect a rotational speed of said conveying roller pair;
- a pressure control unit configured to control a nip pressure of said conveying roller pair;
- and
- a main control unit configured to control said pressure control unit according to a change in the rotational speed of said conveying roller pair detected by said rotational speed-detecting unit during sheet conveyance.
Dependencies are inferred from the claim text.