Document-feeding roller mechanism and printing apparatus having the same
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United States of America Patent
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Jan 7, 2014
Grant Date -
Nov 15, 2012
app pub date -
Nov 14, 2011
filing date -
May 10, 2011
priority date (Note) -
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Abstract
A document-feeding roller mechanism includes a feeding roller assembly and a clamping-force adjusting module. The feeding roller includes a roller frame, a first roller unit, and a second roller unit. A document is conveyed by the first and second roller units through a printing module. The clamping-force adjusting module includes a cam unit and a resilient pressing unit. The resilient pressing unit is disposed between the roller frame and the cam unit. When the cam unit is rotated, the biasing force of the resilient pressing unit applied to the roller frame can be adjusted to change the document clamping force of the first and second roller units. Hence, just before a trailing end of the document is separated from the first and second roller units, the document clamping force can be reduced.
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