Patent ID: 8326207

Claim:
A sheet transport device, comprising: at least one transport roller provided to a diverging point of a sheet reversing portion from which a recording medium enters or exits, configured to transport the recording medium to the sheet reversing portion; at least one roller guide provided in a vicinity of an end face of at least one side of the at least one transport roller, configured to suppress a curled portion of a corner portion of the recording medium from contacting the at least one transport roller when reversing the recording medium; and a shaft on which the at least one transport roller and the at least one roller guide are disposed, wherein rotation of the at least one transport roller does not change during a reverse transport of the recording medium to the sheet reversing portion, friction between a peripheral surface of the at least one roller guide and the recording medium is lower than the friction between the at least one transport roller and the recording medium, the at least one roller guide and the at least one transport roller are coaxially provided to a same shaft, and the at least one roller guide is rotatable in both forward and reverse directions, independent of a rotation of the at least one transport roller, the at least one roller guide is provided between a plurality of transport rollers and is formed of a low frictional material so as to provide slidability, and a slide member provided between the at least one roller guide and the at least one transport roller to prevent the at least one roller guide and the at least one transport roller from contacting each other.