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PRINTING DENSITY DETECTING DEVICE, PRINTING DENSITY ADJUSTING DEVICE, PRINTING DENSITY DETECTING METHOD AND PRINTING DENSITY ADJUSTING METHOD FOR ELECTROPHOTOGRAPHIC PRINTER
PRINTING DENSITY DETECTING DEVICE, PRINTING DENSITY ADJUSTING DEVICE, PRINTING DENSITY DETECTING METHOD AND PRINTING DENSITY ADJUSTING METHOD FOR ELECTROPHOTOGRAPHIC PRINTER
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机译:电子照相打印机的印刷密度检测装置,印刷密度调整装置,印刷密度检测方法和印刷密度调整方法
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摘要
PROBLEM TO BE SOLVED: To provide an electrophotographic printer capable of detecting printing density all over the printing paper and performing printing with uniform density.;SOLUTION: Toner marks 3 to 6 are printed in the four corners of each page of a printing paper 7. A left-side toner density sensor 1 and a right-side toner density sensor 2 are installed at positions corresponding to side parts on both sides of the printing paper. A toner density control part 8 compares respective voltage values obtained by converting the printing density of the toner marks 3 to 6 with a reference voltage range value and outputs a toner supply command to a toner supply motor 9 when any of the printing density of the toner marks 3, 4, 5 and 6 is below the lower limit value of a reference range value, and outputs a toner supply stop command to the motor 9 when any of the printing density of the toner marks 3, 4, 5 and 6 exceeds the upper limit value of the reference range value.;COPYRIGHT: (C)2001,JPO
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