Pickup error-sensing apparatus of image forming apparatus...

Details Pickup error-sensing apparatus of image forming apparatus... Pickup error-sensing apparatus of image forming apparatus...

2006-06-20

2006-06-20

Bollinger, David H. (Department: 3653)

Sheet feeding or delivering

Feeding

Separators

C271S110000, C271S258010

Reexamination Certificate

active

07063315

ABSTRACT:
A pickup error-sensing apparatus of an image forming apparatus and method therefor. The pickup error-sensing apparatus includes a sensing actuator rotatably disposed on a frame with respect to a paper cassette, displaceable when sheets of paper are loaded in the cassette, a paper sensor unit outputting a paper loading and unloading signals according to the displacement of the sensing actuator, a sensing actuator-operating unit operating the sensing actuator to allow the paper sensor unit to output the paper unloading signal when a pickup roller carries out a pickup movement, and a control unit determining whether the paper unloading signal is output when the pickup roller carries out the pickup movement, and determining occurrence of a pickup error to stop the image forming apparatus when the paper unloading signal is not output. The apparatus and method sense the pickup error generated from inadequate movement of the pick-up roller without installing a separate paper sensor.

REFERENCES:
patent: 4888617 (1989-12-01), Okuzawa
patent: 5204726 (1993-04-01), Choi
patent: 5700003 (1997-12-01), Sung
patent: 5897112 (1999-04-01), Kwag
patent: 2004/0041329 (2004-03-01), Hiraoka
patent: 2004/0195757 (2004-10-01), Lyu et al.

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