Sheet Post-Processing Apparatus Staple Removal Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional center binding staplers face issues with sheet jams due to staples cutting into the anvil, requiring costly solenoids for staple removal and occupying additional space.
Innovation Solution
A sheet post-processing apparatus with independently driven first and second conveying rollers, where the second rollers rotate at a different speed after stapling to gently pull the sheets, facilitating staple removal without jamming and reducing the need for additional space or costly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solenoid is used to forcibly tear off a staple cutting into the anvil, then the staple can be removed, but the device complexity and cost increase
Solution Approach 1:
The conveying rollers themselves perform the staple removal function by creating tension that pulls the staple out of the anvil. The system uses its existing conveying mechanism to serve the additional function of staple removal, eliminating the need for a dedicated solenoid device.
Solution Approach 2:
The conveying rollers are designed to perform multiple functions: normal sheet conveyance and staple removal. By making the rollers multi-functional, the patent eliminates the need for separate staple removal mechanisms, thereby reducing device complexity and cost.
2Reliability
If a solenoid is used to forcibly tear off a staple cutting into the anvil, then the staple can be removed, but the space required increases
Solution Approach 1:
The conveying rollers are designed to perform multiple functions: normal sheet conveyance and staple removal. By making the rollers multi-functional, the patent eliminates the need for separate staple removal mechanisms, thereby reducing device complexity and cost.
Solution Approach 2:
The patent combines the staple removal function with the existing conveying roller system. Instead of adding a separate solenoid mechanism that would require additional space, the functionality is merged into the rollers themselves, saving space.
3Productivity
If sheet conveyance is started while a staple remains in the anvil, then continuous processing can proceed, but sheet jams occur
Solution Approach 1:
The system performs preliminary staple removal by creating tension with the conveying rollers before sheet conveyance continues. This preliminary action prevents the harmful effect of sheet jams that would occur if conveyance started with a staple still in the anvil.
Solution Approach 2:
The patent converts the potentially harmful situation of a staple in the anvil into a beneficial process. By using the staple's presence to create tension that facilitates its removal, the system transforms a problem into a solution, enabling continuous processing without jams.
Data Source
AI summary
A sheet post-processing apparatus includes a stacking tray on which sheets are stacked, an aligning unit that aligns the sheets stacked on the stacking tray, a stapler that staples the sheets aligned by the aligning unit using two members provided on one surface side and the other surface side in a thickness direction of the sheets, first conveying rollers arranged in a position on an upstream side along a conveying direction after stapling of the sheets and in contact with one end of the sheets and driven to rotate after the stapling by the stapler, and second conveying rollers arranged in a position on a downstream side along the conveying direction of the sheets and in contact with the other end of the sheets and driven to rotate at rotation speed different from that of the first conveying rollers after the stapling by the stapler.