| 摘要 |
An apparatus for transporting a sheet recording medium ( 12 ) has an entrance drive roller ( 16 ) paired with a corresponding entrance pressure roller ( 18 ) to form an entrance nip ( 14 ) for transporting the sheet recording medium ( 12 ) into a scanning section ( 20 ) between the entrance nip ( 14 ) and an exit nip ( 24 ). The exit nip ( 24 ) is formed by an exit drive roller ( 26 ) with a corresponding exit pressure roller ( 28 ) for transporting the recording medium ( 12 ) out from the scanning section ( 20 ). At each end of the entrance pressure roller ( 18 ), an entrance pressure roller actuation arm ( 120 ) actuates the entrance pressure roller ( 18 ) to exert variable force against the entrance drive roller ( 16 ). At each end of the exit pressure roller ( 28 ), an exit pressure roller actuation arm ( 130 ) actuates the exit pressure roller ( 28 ) to exert variable force against the exit drive roller ( 26 ).
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