CLEANING MECHANISM, TONER CONCENTRATION SENSOR PROVIDED WITH SAME CLEANING MECHANISM, AND DEVELOPING DEVICE, ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE, AND INK JET RECORDING DEVICE, PROVIDED WITH SAME SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a cleaning mechanism for a toner concentration sensor, preventing, by a simple mechanism, deterioration in light-receiving sensitivity of a density measuring part due to sticking of toner an inner surface of a cell part. ;SOLUTION: This cleaning mechanism for a toner concentration sensor has a cell part 1 a part of which, being a concentration measuring part forming a passage for circulating toner ink, or the whole body of which is made of transparent members, and a light-emitting element 3 as well as a light-receiving element 4, disposed facing each other with the cell part 1 between, and a cleaning member 2 made up of an elastic body contacting with an inner surface of the cell part 1 is disposed in the passage in the cell part 1. A first supply port 5 and a first discharge port 6 are formed in one end of the cell part 1, and the first discharge port 6 is formed on the side of the concentration measuring part 19 of the cell part 1 relative to the first supply port 5. A second supply port 7 and a second discharge port 8 are formed in the other end of the cell part 1, and the second discharge port 8 is formed on the side of the concentration measuring part 19 of the cell part 1 relative to the second supply port 7.;COPYRIGHT: (C)2000,JPO