IMAGE FORMING APPARATUS
Number of patents in Portfolio can not be more than 2000
United States of America
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Issued Date -
Jan 16, 2020
app pub date -
May 20, 2019
filing date -
May 20, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
An image forming apparatus includes a stacking unit having a stack tray, a conveyance unit, an image forming unit, a direct current (DC) brush motor, a drive unit, a detector, a first determiner, and a second determiner. An image forming unit forms an image on a sheet conveyed by the conveyance unit from the stack tray. The drive unit drives the DC brush motor to lift and lower the stack tray in a vertical direction. The detector detects a drive current flowing through a DC brush motor winding. The first determiner determines a DC brush motor rotor rotation amount based on the number of times an absolute value of a current value of the detected drive current changes from a value smaller than a threshold to a value greater than the threshold. The second determiner determines a residual amount of stack tray stacked sheets based on the determined rotation amount.
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