Sheet Processing Punch Unit Shift Mechanism for Jam Prevention
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Solution Overview
Problem
Existing sheet processing apparatuses face limitations in processing speed and efficiency, particularly for sorting and punching operations, due to the need for repeated shifts and alignment with the shift roller and punch unit, leading to increased processing time and potential jamming issues with larger sheets.
Innovation Solution
The apparatus shifts the end portion processing unit to a position aligned with the sheet transport direction before the sheet is carried in, allowing for simultaneous or earlier processing, and adjusts the punch unit's position to avoid die hole interference, enabling efficient sorting and punching without the need for high-speed shifts or large drive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the punch unit processes sheets at high speed with multiple punch blades and die holes, then punching processing speed is improved, but punch dust accumulates rapidly in the dust box causing frequent halts
Solution Approach 1:
The lever member is positioned to contact and flatten punch dust in advance before the dust box becomes full, preventing dust accumulation that would cause halts. This preliminary action maintains continuous high-speed punching operation without interruption for dust box maintenance.
2Manufacturing precision
If the sheet processing apparatus performs shift processing in the processing tray, then sorting accuracy is improved, but processing time increases
Solution Approach 1:
The shift function is extracted from the processing tray and integrated into the punch unit itself. The punch unit can now perform both punching and shifting operations, eliminating the need for separate shift processing in the tray and reducing overall processing time while maintaining sorting accuracy.
3Volume of moving object
If the apparatus is miniaturized by disposing the binding apparatus inside the body, then overall apparatus size is reduced, but sheet processing capacity is limited
Solution Approach 1:
The punch unit is designed with multi-functionality, capable of performing both punching operations and shift operations. This universal design allows the compact apparatus to handle various sheet processing tasks including punching, shifting for sorting, and binding, maintaining high adaptability within a miniaturized form factor.
Data Source
AI summary
A sheet processing apparatus is provided with a carry-in path for guiding a sheet from a carry-in entrance, a shift roller provided in the carry-in path to transport the sheet, while shifting, a carry-in roller positioned on the downstream side of the shift roller to carry the sheet from the carry-in path toward a collection tray, and a punch shift unit provided on the upstream side of the carry-in roller to process an end portion of the sheet in a processing position. The punch shift unit shifts in the same direction as the shift roller, a shift amount of the punch shift unit is set to be equal to a shift amount of the shift roller or more, and the end portion processing unit is thereby already positioned in an end portion processing position or a position near the processing position after shifting the sheet.