| 摘要 |
A waiting tray comprises left and right lower face support members for supporting a sheet. These support members are formed so that a width of an opening portion formed therebetween is wide at a distal end side as compared with a proximal end side in a transport direction of a sheet to be transported to the waiting tray. When the sheet which is not required to be retained in a waiting mode is transported to the waiting tray, at a time point when the sheet distal end reaches the waiting tray, both of the support members are opened to an extent such that the width of the opening portion of the left and right lower face support members is narrower than a sheet width at the proximal end side in the transport direction of the sheet, and is wider than the sheet width at the distal end side of the sheet. In this manner the sheet is dropped from the sheet distal end to the processing tray immediately without being retained in a waiting mode.
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