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Image forming apparatus with back sheet portion determination for a booklet surface sheet

Image Number 4 for United States Patent #6070023.

When a surface sheet manufacture mode is selected, a CPU calculates a size of a back sheet portion of a surface sheet, on the basis of a sheet thickness detected by a sheet thickness detect portion, a consumed toner amount calculated by an estimate circuit and the number of transfer materials counted. After the predetermined number of imaged transfer materials are outputted, a transfer material having a size accommodating with the calculated size of the back sheet portion, whereby information for determining the size of back sheet portion of the surface sheet can be inputted correctly.

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