Scanner Discharge Tray Guide Member for Jam Prevention
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Solution Overview
Problem
Image reading apparatuses face issues with medium jamming due to curling of trailing edges, particularly with weak or low-rigidity media, as the discharge speed affects where the medium lands on the discharged-sheet receiving tray, leading to potential jamming.
Innovation Solution
Incorporating a first member that supports the medium at a position higher than the placement surface of the media receiving tray, positioned closer to the discharge device, and optionally serving as a packing member, to prevent curling and ensure proper stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge roller pair discharges medium at high speed, then productivity is improved, but the trailing edge of medium lands downstream on the tray causing curling and jamming
Solution Approach 1:
A guide member is introduced as an intermediary component between the discharge roller pair and the discharged-sheet receiving tray. This guide member includes a guide surface that guides the trailing edge of the discharged medium, preventing it from curling up regardless of discharge speed. The guide member acts as a mediator that controls the medium's path and prevents the harmful curling effect that would otherwise occur at high discharge speeds.
2Stability of the object's composition
If the discharge roller pair discharges medium at low speed, then medium stability is improved, but the trailing edge remains in the apparatus body and curls up causing jamming
Solution Approach 1:
The guide member serves as a mediator that ensures the trailing edge of the medium is properly guided even when discharge speed is low. The guide surface provides a controlled path that prevents the trailing edge from remaining inside the apparatus body and curling up, thereby eliminating jamming issues at low discharge speeds.
Solution Approach 2:
The guide member extends in the depth direction of the apparatus, creating a three-dimensional guiding structure. This dimensional extension allows the guide surface to effectively intercept and guide the trailing edge of the medium, preventing curling regardless of the discharge speed. The guide member's projection beyond the discharge roller pair in the depth direction creates a spatial constraint that prevents harmful medium behavior.
3Quantity of substance
If space is provided between medium placement surface and discharge roller pair, then medium stacking capacity is improved, but trailing edge support is insufficient leading to curling
Solution Approach 1:
The guide member acts as an intermediary support structure that bridges the gap between the discharge roller pair and the discharged-sheet receiving tray. It provides necessary support for the trailing edge of the medium in the space between the discharge roller pair and the tray, preventing curling while maintaining the stacking capacity provided by the height space.
Solution Approach 2:
The guide member utilizes the depth direction dimension to provide trailing edge support. By projecting beyond the discharge roller pair in the depth direction, the guide member creates a support structure that spans the vertical space between the discharge roller pair and the tray, thereby providing stability without reducing stacking capacity.
Data Source
AI summary
The likelihood of a medium jamming is reduced or avoided during discharging media to a discharged-sheet receiving tray, and a plurality of media are appropriately discharged to, and stacked on, the discharged-sheet receiving tray. A scanner includes an apparatus body including a reading section that reads a sheet, a discharge roller pair that is provided inside the apparatus body and discharges the sheet after reads in the reading section, and a discharged sheet tray that receives the sheet being discharged by the discharge roller pair. The discharged sheet tray includes a first member that has at least a portion that is located inside the apparatus body. The first member is that supports the medium at a position higher than the placement surface of the discharged sheet tray.