IMAGE FORMING APPARATUS

To prevent the occurrence of a dust-like abnormal image even when a sheet with a small thickness is fed.SOLUTION: An image forming apparatus comprises: a conveyance belt 61 that conveys a sheet P between a transfer nip N1 and a fixing nip N2; a motor Mt3 (driving means) that drives the conveyance be...

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Bibliographic Details
Main Authors HONJO KENJI, NAGATA ATSUSHI, NAGATA HARUKI, HASEGAWA AKIRA
Format Patent
LanguageEnglish
Japanese
Published 07.03.2019
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:To prevent the occurrence of a dust-like abnormal image even when a sheet with a small thickness is fed.SOLUTION: An image forming apparatus comprises: a conveyance belt 61 that conveys a sheet P between a transfer nip N1 and a fixing nip N2; a motor Mt3 (driving means) that drives the conveyance belt 61; and a paper thickness sensor 93 (thickness detection means) that detects the thickness of the sheet P conveyed by the conveyance belt 61. When the thickness detected by the paper thickness sensor 93 is small, a control unit 90 controls the motor Mt3 so as to reduce a velocity ratio A/B (=surface linear velocity A of conveyance belt 61/surface linear velocity B of transfer rotating body 70) compared with that when the thickness is large.SELECTED DRAWING: Figure 3 【課題】厚みが薄いシートが通紙されても、チリ状の異常画像が発生しないようにする。【解決手段】転写ニップＮ１と定着ニップＮ２との間でシートＰを搬送する搬送ベルト６１や、搬送ベルト６１を駆動するモータＭｔ３（駆動手段）や、搬送ベルト６１によって搬送されるシートＰの厚みを検知する紙厚センサ９３（厚み検知手段）、が設置されている。そして、紙厚センサ９３によって検知された厚みが薄い場合に、厚みが厚い場合に比べて、速度比Ａ／Ｂ（＝搬送ベルト６１の表面線速度Ａ／転写回転体７０の表面線速度Ｂ）が小さくなるように、制御部９０によってモータＭｔ３を制御している。【選択図】図３
Bibliography:Application Number: JP20170155053