Sheet Cutting Device Slanted Blade Pressing Mechanism
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Solution Overview
Problem
Existing sheet cutting devices in image forming systems face inefficiencies due to high noise production and prolonged time intervals for securing bundles during cutting, which affects the working efficiency of post-processing devices and image forming systems.
Innovation Solution
A sheet cutting device with a cutting blade that moves in a compounded slanted direction, supported by a pressing member driven perpendicular to the sheet surface, and a control system to release pressure and retract the blade after cutting, minimizing noise and improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressing member works as both a pressing section and a receiving section of the cutter blade, then the device complexity is reduced, but large noise is produced by friction when the cutter blade is released
Solution Approach 1:
The pressing member is divided into two separate functional sections: a pressing section for applying pressure to the sheet bundle and a receiving section for receiving the cutter blade. This segmentation allows each section to be optimized for its specific function, reducing friction noise during blade release while maintaining structural efficiency
Solution Approach 2:
Different sections of the pressing member are given different properties: the pressing section has a pressing surface for applying force, while the receiving section has a blade receiving surface with specific friction characteristics. This local differentiation reduces noise during blade release while maintaining effective pressing capability
2Manufacturing precision
If the cutter blade is strongly pressed against the sheet surface, then cutting performance is improved, but the time interval for securing the bundle at the cutting position is prolonged
Solution Approach 1:
The pressing member is positioned and adjusted in advance to the optimal pressing position before the cutting operation begins. This preliminary positioning ensures that when cutting starts, the bundle is already securely held, reducing the time needed to secure the bundle during the cutting process while maintaining strong cutting performance
Solution Approach 2:
The pressing member is designed to be movable, allowing it to be dynamically adjusted to the optimal pressing position before cutting and then retracted after cutting. This dynamic capability enables quick setup and release, reducing the time interval for securing the bundle while maintaining effective cutting pressure when needed
3Manufacturing precision
If the bundle of sheets is secured under high pressure during cutting, then cutting precision is improved, but working efficiency is reduced due to prolonged securing time
Solution Approach 1:
The pressing member is pre-positioned to apply high pressure exactly where needed before the cutting operation starts. This preliminary action ensures cutting precision is achieved without requiring prolonged securing time, as the pressure is applied optimally from the beginning of the cutting process
Solution Approach 2:
The pressing member operates in periodic cycles: advancing to apply pressure before cutting, holding during cutting, and retracting after cutting. This periodic operation allows high pressure to be applied only when needed for precision cutting, while minimizing the time the bundle is secured under pressure, thus improving working efficiency
Data Source
AI summary
A sheet cutting device, including a cutting blade for cutting a bundle of sheets, while moving in a slanted direction compounded by a direction perpendicular to the surface of sheet and a direction parallel to the sheet surface; a supporting member for supporting the bundle of sheets in the vicinity of a cutting position; a pressing section to press the bundle of sheets against the supporting member in a direction reverse to a moving direction of the cutting blade and perpendicular to the sheet surface, and the pressing section to receive the cutting blade at the time when the cutting blade cuts the bundle of sheets; a cutting blade driving section to drive the cutting blade; a pressing section driving section to drive the pressing section; and a control section to release pressing of the bundle of sheets and retract the cutting blade, after the bundle of sheets is cut.