Image forming apparatus

A non-transitory recording medium storing a computer readable control program for life estimation of an image forming apparatus,

• the image forming apparatus including
• a plurality of photoconductors that is rotatable and has toner images to be formed on respective surfaces,
• a transfer belt on which the toner images respectively formed on the plurality of photoconductors are sequentially transferred, and
• a hardware processor that estimates timing of arrival of end of life of one photoconductor of the plurality of photoconductors due to depletion of the surface of the one photoconductor,
• the control program causing the hardware processor to perform:
• calculating a depletion amount of the one photoconductor due to a toner, as a first depletion amount, on the basis of a first parameter having a positive correlation with an amount of the toner used for the toner image formed on the surface of another photoconductor that transfers the toner image on the transfer belt before the one photoconductor;
• and
• comparing the calculated first depletion amount with a predetermined life estimation threshold value to estimate the timing of arrival of end of life of the one photoconductor.

A life estimation device for life estimation of an image forming apparatus,

• the image forming apparatus including
• a plurality of photoconductors that is rotatable and has toner images to be formed on respective surfaces, and
• a transfer belt on which the toner images respectively formed on the plurality of photoconductors are sequentially transferred,
• the life estimation device comprising:
• a hardware processor that estimates timing of arrival of end of life of one photoconductor of the plurality of photoconductors due to depletion of the surface of the one photoconductor, wherein
• the hardware processor
• calculates a depletion amount of the one photoconductor due to a toner, as a first depletion amount, on the basis of a first parameter having a positive correlation with an amount of the toner used for the toner image formed on the surface of another photoconductor that transfers the toner image on the transfer belt before the one photoconductor, and
• compares the calculated first depletion amount with a predetermined life estimation threshold value to estimate the timing of arrival of end of life of the one photoconductor.