ELECTROPHOTOGRAPHIC COPYING DEVICE

摘要

PURPOSE:To invariably copy a high-quality image by accurately correcting the transfer current without causing impediments such as a transfer miss and a transfer cussing in an electrophotographic copying device in the high-humidity high-temperature state. CONSTITUTION:An electrophotographic copying device is provided with a history memory means of the output value change from a humidity detecting means and a measurement memory means of the stack period of transfer sheets in a transfer sheet cassette, and the corona discharge output of a charge unit is programmed to follow the optimum value based on the memory value and the number and sequence of the transfer sheets stacked in the cassette.