Image forming apparatus including a drum cartridge having a detection gear
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United States of America Patent
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Jan 29, 2019
Grant Date -
Feb 1, 2018
app pub date -
Mar 24, 2017
filing date -
Jul 27, 2016
priority date (Note) -
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Abstract
A main casing includes a driving source, a first sheet passage sensor for detecting a sheet, and a detecting sensor. A drum cartridge is detachably mounted on the main casing. The drum cartridge includes: a photosensitive drum being rotatable about a first axis extending in a first direction; a first detection gear being rotatable by receiving driving force from the driving source; and a first detection protrusion being rotatable together with the first detection gear. The first detection protrusion is arranged to contact the first sheet passage sensor. A developing cartridge is detachably mounted on the drum cartridge. The developing cartridge includes: a developing roller; a second detection gear being rotatable by receiving driving force from the driving source; and a second detection protrusion being rotatable together with the second detection gear. The second detection protrusion is arranged to contact the detecting sensor.
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