Paper discharge device and image forming device

Abstract

The invention provides a paper discharge device and an image forming device. In the post-processing device (paper discharge device), the paper bundle thickness calculation section calculates the thickness of the top end of the paper bundle stacked on the paper discharge tray (stacking section) in the discharge direction based on the type and number of sheets discharged from the paper discharge port. The movement amount of the lifter calculates the thickness of the rear end of the paper bundle stacked on the paper discharge tray in the discharge direction, and calculates the thickness of the stacked paper bundle on the paper discharge tray based on the respective thicknesses of the rear end of the discharge top, the slope height of the paper discharge tray, and the length of the paper. The angle of inclination of the top sheet of the paper stack. The control unit performs control to change the manner in which the paper is discharged by the paper discharge unit based on the calculated inclination angle. As a result, when the bundle of sheets to be stapled is stacked on the paper discharge tray, slipping of the bundle of discharged sheets and collapse of the bundle of stacked sheets can be reliably prevented.

Description

technical field [0001] The present invention relates to a paper discharge device and an image forming apparatus, and more particularly, the present invention relates to a technique for preventing paper stacked on a paper discharge tray 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 det...

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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