PURPOSE: To detect that the life of an electrophotographic photosensitive body is shortened due to damage before picture defect appears by providing a detecting means detecting the surface coarseness of the electrophotographic sensitive body.
CONSTITUTION: After a visual picture is transferred onto a transfer sheet 10, a destaticizing means 7 removes residual charges on the electrophotographic sensitive body 1, and then a cleaning means 2 removes an after image on the sensitive body 1. At the end of stopping the rotation of the sensitive body 1, a surface coarseness detector 9 detects the surface coarseness of the sensitive body 1. Thus, the body 1 can be fully used regardless of the variance of the number of copied sheets in endurance limit which is caused by environmental difference and mechanical difference. Alarming is issued before a picture is damaged, whereby reliability on the picture quality can be enhanced.
SAKO SHUNKAI
SAKAKIBARA TEIGO
SAKAI KIYOSHI
