Image forming apparatus

An image forming apparatus for forming image information corresponding to an image of an original document on recording sheets by a mimeographic printing system, comprising:

• a stencil forming section for forming a stencil based on the image information corresponding to the image of the original document,
• a printing section for providing a mimeographic printing on the recording sheets by the stencil prepared at the stencil forming section,
• sheet size sensor means for detecting a size of the recording sheets,
• printed sheet counting means for counting the number of printed recording sheets printed at the printing section,
• stencil counting means for counting the number of formed stencil prepared at the stencil forming section,
• calculating means connected to the sheet size sensor means, printed sheet counting means and stencil counting means, said calculating means calculating printing charge based on the number of the printed recording sheets counted by the printed sheet counting means and data of printing charge per sheet corresponding to the size of the recording sheet detected by the sheet size sensor means, and stencil forming charge based on the number of used stencils counted by the stencil counting means and data of stencil charge per one stencil, and
• display means for displaying calculation results of the printing charge and the stencil forming charge calculated by the calculating means.

An image forming apparatus for forming image information corresponding to an image of an original document on recording sheets, comprising:

• timer means for counting predetermined terms continuously,
• sheet size sensor means for detecting a size of said recording sheets,
• counter means for counting the number of pages of the recording sheets on which the image information has been recorded,
• memory means for storing data of printing charge per sheet, preset for a predetermined range of the number of sheets according to the size of said recording sheets,
• calculating means connected to the timer means, sheet size sensor means, counter means and memory means, said calculating means calculating printing charge for each usage based on data of the number of printed sheets counted by said counter means and data of the printing charge per sheet preset for a predetermined range of the number of sheets according to the size of the recording sheets detected by said sheet size sensor means, said calculating means calculating a total number of pages of the printed sheets and total printing charges for each predetermined term based on the timer means, and
• display means for selectively displaying calculation results for said each usage, and said total number of pages and said total printing charges for the predetermined term calculated by said calculating means.