Image forming apparatus

Details Image forming apparatus Image forming apparatus

1997-12-22

1999-06-08

Moses, Richard

Electrophotography

Diagnostics

Document handling

399 8, 399361, G03G 2100

Patent

active

059110929

ABSTRACT:
An apparatus for forming an image on a recording sheet comprises a jam data holder storing a predetermined number of jam occurrence data arranged in time sequence, whereby when the jam data holder receives the newest jam occurrence data, the jam data holder adds the newest jam occurrence data into the predetermined number of jam occurrence data and eliminates the oldest jam occurrence data from the predetermined number of jam occurrence data; a calculator for calculating jam occurrence frequency when the jam data holder receives the newest jam occurrence data, wherein the calculator references the jam occurrence data from the predetermined number of jam occurrence data stored in the jam data holder, calculates a number N of jam occurrences, the total sheet number T1 when the oldest jam occurrence was detected and the total sheet number T2 when the newest jam occurrence was detected and calculates a jam occurrence frequency based on the difference between the total sheet number T2 and the total sheet number T1 and the number N of jam occurrence; and a signal generator to output a jam frequently-occurring signal when the number of jam occurrence is larger than a first predetermined number and the jam occurrence frequency is larger than a second predetermined number.

REFERENCES:
patent: 5012281 (1991-04-01), Kusumoto et al.
patent: 5424808 (1995-06-01), Maekawa et al.
patent: 5708908 (1998-01-01), Hirata et al.
patent: 5715496 (1998-02-01), Sawada et al.

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