Image forming apparatus with marginless printing mode

Details Image forming apparatus with marginless printing mode Image forming apparatus with marginless printing mode

2009-02-03

2011-12-20

Brase, Sandra (Department: 2884)

Electrophotography

Image formation

Transfer

C399S099000, C399S297000, C399S299000

Reexamination Certificate

active

08081912

ABSTRACT:
An image forming apparatus operates in a marginless print mode in which the toner image is formed on a first region on a first image bearing member corresponding to a sheet size and a second region on the first image bearing member outside the first region. Reverse-transfer efficiency TR1and reverse-transfer efficiency TR2satisfy TR1<TR2. TR1is a percentage of a mass/area, of toner back-transferred from the sheet onto the second image bearing member by a second transfer member to a mass/area, of toner transferred from the first region onto the sheet by a first transfer member. TR2is a percentage of a mass/area, of toner back-transferred from a sheet feeder onto the second image bearing member by a second transferring means to a mass/area, of the toner transferred from the second region onto the sheet feeder by the first transfer member.

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