| 摘要 |
An electrically biased attracter roller (60) is utilized in an electrophotographic image reproduction machine (10a), in place of a conventional corotron device, to electrically transfer toner from the side of a rotating photoconductor drum (14a) onto a side surface of paper stock (36a) being operatively fed through the machine. The charged roller (60) is spring-biased into forcible side-to-side engagement with the drum (14a) and is frictionally rotated by the drum. The paper stock (36a) is fed between the rotating roller (60) and drum (14a) and, by a combination of pressure and electrical attractive force, the roller (60) very efficiently transfers toner from the drum (14a) to the paper. To further improve the overall effectiveness of the attracter roller (60), a humidity compensation system (86) is provided and is operative to automatically adjust the bias voltage of the roller (60) and thus the electrical toner attraction force thereof, in response to sensed humidity variations within the machine housing. .
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