Post-Processing Apparatus Z-Folded Sheet Discharge
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Solution Overview
Problem
Existing post-processing apparatuses face challenges in efficiently handling and processing Z-folded sheets, particularly in aligning and stapling sheets with long feed lengths, as the rear end of the sheet often fails to reach the compile tray due to the sheet's folds obstructing the discharge process.
Innovation Solution
A post-processing apparatus equipped with a lifting drive device that moves the stacker tray downward when a Z-folded sheet is pulled into the processing unit, allowing the rear end of the sheet to align properly with the compile tray and enabling efficient stapling and discharge, even for sheets with long feed lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Z-folded sheet with long feed length is pulled into the processing unit, then the sheet can be processed, but the rear end of the sheet fails to reach the compile tray due to fold obstruction
Solution Approach 1:
The patent applies the dynamics principle by making the stacker tray height adjustable rather than fixed. The lifting drive device dynamically changes the stacker tray position based on the type of sheet being processed. When a Z-folded sheet is detected, the stacker tray is lowered to allow the folded sheet to be properly pulled in and discharged. This dynamic adjustment resolves the contradiction between processing capability and ease of operation.
Solution Approach 2:
The patent implements parameter changes by modifying the height parameter of the stacker tray based on the sheet configuration. The controller detects whether a Z-folded sheet is being processed and accordingly changes the stacker tray height parameter from the normal position to a lowered position. This parameter change enables the rear end of the folded sheet to reach the compile tray while maintaining proper alignment.
2Device complexity
If the stacker tray height is fixed for unfolded sheets, then the discharge process is simple, but Z-folded sheets cannot be properly discharged
Solution Approach 1:
The patent applies universality by designing the stacker tray system to serve multiple functions: it can operate at a normal height for unfolded sheets and at a lowered height for Z-folded sheets. The lifting drive device enables the stacker tray to adapt to different sheet types, making the discharge mechanism universally applicable to both unfolded and folded sheets without requiring separate mechanisms.
Solution Approach 2:
The system transitions from a static, fixed-height stacker tray to a dynamic, adjustable-height stacker tray. The lifting drive device enables the stacker tray to change its position based on the sheet type being processed, allowing the same hardware to handle multiple sheet configurations effectively.
3Device complexity
If the stacker tray remains at normal height, then the discharge structure is simple, but the rear end of folded sheets cannot align with the compile tray
Solution Approach 1:
The patent uses dynamics to adjust the stacker tray height dynamically based on the sheet type. When a Z-folded sheet is detected, the stacker tray is lowered to the appropriate position to ensure the rear end of the folded sheet aligns precisely with the compile tray. This dynamic adjustment maintains high alignment precision while avoiding the need for complex fixed-position mechanisms.
Data Source
AI summary
A post-processing apparatus includes: a processing unit configured to pull in a recording medium transported from an upstream apparatus and perform processing on the recording medium; a discharge unit to which the recording medium processed by the processing unit is discharged; and a lifting drive device configured to, in a case where a folded recording medium is pulled into the processing unit, move the discharge unit downward such that a height of the discharge unit is lower than a height of the discharge unit in a case where an unfolded recording medium is pulled into the processing unit.