Medium Guide Mechanism for Jam-Resistant Sheet Transport
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Solution Overview
Problem
Existing sheet-transport-path switching mechanisms in image forming apparatuses experience frequent jamming due to significant changes in the orientation of guiding members when the open-close covering shifts, leading to inefficiencies and mechanical stress.
Innovation Solution
A medium guide mechanism with a pressed member, contact member, and guiding member configuration where the guiding member's orientation changes in association with the contact member's orientation, which is fixed by contact with the pressed member, reducing the amount of orientation change when the open-close covering shifts, thereby minimizing jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the guiding member's orientation changes in accordance with the pressed member's orientation when the open-close covering shifts, then the sheet transport path can be switched, but the guiding member experiences significant orientation change causing frequent jamming
Solution Approach 1:
The patent introduces a contact member as an intermediary between the pressed member and the guiding member. The contact member receives the pressing force from the pressed member and transmits it to the guiding member, thereby mediating the orientation change relationship. This intermediary mechanism allows the guiding member to change orientation in a controlled manner that reduces jamming while still enabling sheet transport path switching.
Solution Approach 2:
The patent changes the parameter of orientation change magnitude by introducing the contact member. Instead of the guiding member directly following the pressed member's orientation changes, the contact member modifies this relationship, resulting in a smaller effective orientation change of the guiding member. This parameter modification reduces the likelihood of jamming while maintaining the necessary path switching functionality.
2Adaptability or versatility
If the guiding member's orientation changes significantly when the open-close covering shifts, then the transport path can be adjusted, but mechanical stress increases and operational reliability decreases
Solution Approach 1:
The contact member serves as a mediator that distributes and controls the mechanical force transmission from the pressed member to the guiding member. This intermediary structure reduces the magnitude of orientation change transmitted to the guiding member, thereby reducing mechanical stress on the components while still enabling transport path adjustment.
Solution Approach 2:
The contact member acts as a cushioning element that anticipates and softens the impact of orientation changes. By introducing this intermediate contact point, the system prepares for and mitigates the mechanical stress that would otherwise be directly transmitted to the guiding member, reducing wear and improving operational reliability.
Data Source
AI summary
A medium guide mechanism includes a pressed member that is pressed by an open-close covering, operable to open or close an opening of a body, in a shift direction of the open-close covering in a state where the open-close covering is shifted to a closing position to close the opening, a contact member that has an orientation thereof fixed by coming into contact with the pressed member in a crossing direction that crosses the shift direction in the state where the open-close covering is shifted to the closing position, and a guiding member that changes an orientation thereof in association with a change in an orientation of the contact member to guide a recording medium that is transported.