| 摘要 |
The sheet transport control apparatus for controlling transport of a sheet is used in a duplex unit for a laser printer, the duplex unit having a transport system and a switchback system. The sheet transport control apparatus includes a transport path from an outlet of the printer through a first paper waiting position to a second paper waiting position, a first driving motor for transporting the sheet from the outlet of the printer to the first paper waiting position, a second driving motor for transporting the sheet temporarily waiting at the first paper waiting position to the switchback system and for switching back the sheet to the second paper waiting position, a first paper sensor for serving as a trigger to start the driving of the first driving motor to transport the sheet, a second paper sensor for serving as a start trigger for the second driving motor, the second paper sensor being provided at a position which is separated by a predetermined length from the second driving motor and allowing direction of the sheet slightly earlier than the time when a drive signal of the second driving motor turns off, so that the re-start timing of transporting of the sheet by the first and second motors is made earlier.
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