Detector for detecting abnormality in developer passage,...

Details Detector for detecting abnormality in developer passage,... Detector for detecting abnormality in developer passage,...

2007-08-28

2007-08-28

Gray, David M. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S237000

Reexamination Certificate

active

11060467

ABSTRACT:
A detector for detecting an abnormality in the developer passage includes a sensing unit for detecting a rotational speed of the developer pump, a rotational speed storage for storing rotational speed reference of the developer pump, and a controller for controlling the driving of the developer pump and detecting the abnormality in the developer passage on the basis of a comparison between a rotational speed calculation of the developer pump according to a detection signal from the sensing unit and a rotational speed reference of the developer pump stored in the rotational speed storage. The detector can be advantageously used for detecting a leak and/or a clogging in the developer passage caused by a manufacture/assembly defect, or sediment of the developer sludge, and can inform the user about the abnormal state of the developer passage.

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European Search Report; Dated: Oct. 10, 2005; Applicant: Samsung Electronics Co., LTD.; Application No. 05253776.8-2209 PCT.

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