Perforation-Aware Sheet Stacking to Prevent Stack Failure
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Solution Overview
Problem
The stacking of sheets with perforations formed on them leads to protrusions such as burrs and flashes, causing deterioration in the stacking state and potential failure or falling of sheets due to uneven stacking.
Innovation Solution
A control unit adjusts the stacking operation based on the presence of perforations, varying the upper limit of stacked sheets according to the type and position of perforations, ensuring sheets are stacked appropriately to prevent failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sheets with perforation are stacked on a stacking tray, then the sheets can be collected and stored, but the projected portions (burr and flash) cause the stacking state to deteriorate and sheets may fall or fail
Solution Approach 1:
The patent changes the physical parameter of the stacking tray surface by providing a protrusion that contacts the perforation line of sheets. This protrusion presses the sheets against the tray surface, counteracting the effect of burr and flash that cause sheets to fall or fail during stacking
Solution Approach 2:
The patent introduces an intermediary structure (protrusion) between the stacking tray and the sheets. This protrusion acts as a mediator that specifically targets the perforation line area to prevent sheet failure while allowing normal stacking operation
Data Source
AI summary
A sheet stacking apparatus (100) includes a conveyance unit (512, 513, 514), a discharge unit (515), a stacking unit (751) that stacks the sheet being discharged by the discharge unit, and a control unit (636) that stops a stacking operation of the sheet to the stacking unit according to an amount of sheets stacked on the stacking unit. The control unit stops the stacking operation of the sheet on the stacking unit in response to having a first amount of sheets being stacked on the stacking unit, in a case where a sheet having no perforation provided thereon is stacked on the stacking unit, and stops the stacking operation of the sheet on the stacking unit in response to having an amount of sheets that is smaller than the first amount being stacked on the stacking unit, in a case where a sheet having a perforation provided thereon is stacked on the stacking unit.