| CPC B65H 31/26 (2013.01) [B65H 31/02 (2013.01); B65H 43/06 (2013.01); B65H 43/08 (2013.01); B65H 45/18 (2013.01); B65H 45/00 (2013.01); B65H 2301/17 (2013.01); B65H 2402/31 (2013.01); B65H 2403/942 (2013.01); B65H 2404/612 (2013.01); B65H 2404/64 (2013.01); B65H 2404/693 (2013.01); B65H 2405/11151 (2013.01); B65H 2511/15 (2013.01); B65H 2553/414 (2013.01); B65H 2553/80 (2013.01); B65H 2701/1123 (2013.01); B65H 2701/11232 (2013.01); B65H 2701/11234 (2013.01); B65H 2701/11238 (2013.01); B65H 2801/27 (2013.01)] | 13 Claims |
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1. A sheet discharge device comprising:
a sheet discharge part including a discharge roller pair for discharging a folded sheet subjected to a folding process;
a sheet discharge tray including a tray upper surface on which the folded sheet discharged from the sheet discharge part is stacked, and a rear wall portion rising from a upstream-side end portion of the tray upper surface in the discharge direction;
a fullness detection sensor which is provided in the sheet discharge part to detect that a height of a stack surface of the folded sheets stacked on the tray upper surface has reached a specified height;
a first sheet presser member which is supported upward of the sheet discharge part and extends toward the upstream side of the tray upper surface in the discharge direction, and with which the folded sheet discharged from the sheet discharge part is brought into contact, and which presses a rear end side of the folded sheet in the discharge direction stacked on the tray upper surface; and
a second sheet presser member which is supported upward of the sheet discharge part and extends toward a downstream side of the tray upper surface in the discharge direction, and which presses a fore end side of the folded sheet in the discharge direction stacked on the tray upper surface, wherein
the fullness detection sensor which is located in a detection position in a widthwise direction perpendicular to the discharge direction, has a detection region which has a specified width in a heightwise direction, and
the first sheet presser member
is disposed outside the fullness detection sensor in the widthwise direction, extends from above the detection sensor to below the detection region, and in a first pressing position with a fore end portion of the first sheet presser member facing upward of the stack surface, is brought into contact with an arbitrary position in a range from a central portion of the folded sheet of a minimum size in the discharge direction stacked on the tray upper surface to the rear wall portion, thereby pressing a swell of the folded sheet, and
when a stack number of the folded sheets has exceeded a specified number, the first sheet presser member is retracted upward from the first pressing position by the rise of the stack surface.
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