Sheet discharge device and image forming apparatus

Abstract

In a post-processing device (sheet discharge device), a pile thickness calculating section calculates, from a type and the number of paper sheets discharged through a sheet output port, a thickness of a pile, at its leading end, of sets of paper sheets on a sheet output tray (piling section), calculates a thickness of the pile, at its trailing end, of sets of paper sheets on the sheet output tray from an amount of movement of a lifting section, and calculates an angle of inclination of the uppermost set of paper sheets in the pile from the thicknesses of the pile at its leading and trailing ends, a height of inclination of the sheet output tray, and a length of the paper sheets. The control section controls the sheet discharge section to change a manner of discharging a subsequent set of paper sheets according to the calculated angle of inclination.

Description

technical field [0001] The present invention relates to a paper discharge device and an image forming apparatus, and specifically, the present invention relates to a technique for preventing paper stacked on a stacking portion from falling. Background technique [0002] An image forming apparatus or the like is provided with a paper discharge device that discharges paper after image formation or post-processing such as punching processing or stapling processing, and a paper discharge tray receives and stacks the discharged paper. In such a paper discharge device, if the stacked state of the paper is disturbed or the like occurs during the stacking of the paper on the paper discharge tray, the paper is not properly stacked on the paper discharge tray. Therefore, some people use the following technology: when the upper surface of the paper stack stacked on the paper discharge tray is not in the proper vertical position with respect to the paper discharge port by a detection se...

AI Technical Summary

Problems solved by technology

However, the above-mentioned a changes depending on the thickness of the paper to be stapled (the thinner the paper, the larger a is), and it is not possible to accurately estimate the topmost value of the stack of paper stacked on the paper discharge tray only by counting the number of staples. paper tilt

Therefore, there is still a concern that the newly discharged paper slips out of the paper discharge tray and the stack of the paper stack collapses.

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