| http://www.w3.org/ns/prov#value | - her the developing roller 31 is to be rotated backward or not based on information such as the running distance of the developing roller or the printing density and controlling the amount of backward rotation or thefrequency of backward rotation of the developing roller 31, it is possible to suppress fusion of toner regardless of the status of use.In the above embodiment, the numerical value such
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