| 摘要 |
A sheet feeder includes a pickup roller for feeding a sheet on a tray toward a predetermined processing position, an arm member rotatably supporting the pickup roller, a rotary shaft supported on the housing to be rotatable about an axis thereof, a coupling member for coupling the arm member and the rotary shaft, a pivoting mechanism for pivoting the arm member via the rotary shaft so that the pickup roller shifts its position between a feeding position and a retracted position, and a controller for controlling the operation of the pivoting mechanism. The controller controls the arm member to pivot in such a direction that the pickup roller moves toward the retracted position when a sheet is placed on the tray.
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