IMAGE FORMATION DEVICE

PROBLEM TO BE SOLVED: To provide an image formation device with which it is possible to reduce image defects of a shape of lateral streak caused by seepage on a belt scraped by a cleaning belt.SOLUTION: According to the present invention, a control unit temporarily stops a belt that rotates in forwa...

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Bibliographische Detailangaben
1. Verfasser: NAKAZAWA NOBUO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an image formation device with which it is possible to reduce image defects of a shape of lateral streak caused by seepage on a belt scraped by a cleaning belt.SOLUTION: According to the present invention, a control unit temporarily stops a belt that rotates in forward when image formation is terminated, and moves the belt in reverse so that a surface part at stopped time is moved from a contact position to a friction position and then stops it again (S7-S8). The control unit rotates a fur brush increasingly longer in correspondence to an increase in the number of sheets of recording material and extends the duration for which the surface part is rubbed by the fur brush (S10), and raises a toner amount on the surface part to a relatively large amount before causing the surface part to be rubbed by the fur brush (S11), or causes the surface part to pass through the blade in addition to causing it to be rubbed by the fur brush (S12). Thus, the surface part of a belt located at a position of contact with the blade when stopped is moved to the rubbing position and rubbed by the fur brush that rotates at the rubbing position, so that image defects of a shape of a lateral streak caused by seepage are made to hardly occur.SELECTED DRAWING: Figure 6 【課題】クリーニングブレードに掻き取られたベルト上の染み出しに起因する横スジ状の画像不良を低減できる画像形成装置の提供。【解決手段】制御部は画像形成終了時、正回転するベルトを一旦停止し、停止された時点の表面部が当接位置から摺擦位置に移動されるように、ベルトを逆移動し再停止する(S7〜S8)。制御部は記録材の枚数が多くなるにつれ、ファーブラシをより長く回転し、表面部がファーブラシに摺擦される時間を長くする(S10)、また表面部のトナー量を比較的に多くしてから、表面部をファーブラシに摺擦させる(S11)、あるいは表面部をファーブラシにより摺擦させることに加えて表面部をブレードに通過させたりする(S12)。これにより、停止時にブレードとの当接位置に位置していたベルトの表面部が摺擦位置に移動され、摺擦位置で回転するファーブラシに摺擦されるので、染み出しに起因する横スジ状の画像不良を生じ難くできる。【選択図】図6