Control method for detecting a paper jam using a toner density s

Photocopying – Contact printing – Light boxes

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355205, G03G 2100

Patent

active

051247593

ABSTRACT:
A control method for an image recorder of the type transporting a recording medium substantially vertically from a lower portion to an upper portion inside the recorder. This type of recorder transfers a toner image from a photoconductive element to the medium, and has a toner density sensor for sensing the toner density of a reference density pattern. When the medium jams in the transport path while being transported in the vertical direction, whether it has slipped out of the transported path and dropped to a position where the toner density sensor is located is determined, the sensor is turned on when the operator starts on an operation for removing the medium and when the operator ends such an operation. When the resultant two consecutive outputs from the sensor are different from each other, it is determined that the medium has dropped and the jam is in the vicinity of the sensor.

REFERENCES:
patent: 4239372 (1980-12-01), Iwai
patent: 4313671 (1982-02-01), Kuru
patent: 4797705 (1989-01-01), Nishioka
patent: 4954848 (1990-09-01), Arima

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