Sheet length measuring device and image forming apparatus
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United States of America Patent
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Aug 12, 2014
Grant Date -
Nov 22, 2012
app pub date -
May 21, 2012
filing date -
May 19, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A sheet length measuring device includes a rotating body configured to rotate with a movement of a sheet in a conveying direction; a position detecting unit configured to detect leading and trailing ends of the sheet passing through a position of the rotating body; a measuring unit configured to measure a rotation amount of the rotating body and output an origin signal per one revolution of the rotating body; a storage unit configured to store changes of a sheet conveying amount with respect to respective rotation angles in one revolution of the rotating body; and a calculating unit configured to calculate a corrected length of the sheet from a value obtained from a rotation angle of the rotating body when the leading end of the sheet is detected and a value obtained from a rotation angle of the rotating body when the trailing end of the sheet is detected.
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