Paper Shredder Staple Removal Edge and Conveyor Tearing Force
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Solution Overview
Problem
Existing auto feed paper shredders face issues with paper slipping due to the lack of a sufficient tearing force from the conveyor, leading to failures in paper feeding, especially when dealing with papers bound by staples or paper clips.
Innovation Solution
The paper shredder incorporates a staple removing structure with a staple removing edge inside the paper feeding slot, spaced from the second wall, and a conveyer system with feeding roller assemblies to provide a large tearing force, ensuring staples or paper clips are blocked and the paper is effectively torn off before reaching the cutters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a roller conveyor is used to convey the stack of paper, then the structure is simple and easy to manufacture, but the tearing force is insufficient causing the paper to slip and feeding to fail
Solution Approach 1:
The conveyor is divided into multiple conveyor rollers arranged in sequence, where each roller contributes to the overall tearing force. The segmentation allows the system to provide sufficient cumulative force while maintaining the simplicity of individual roller components, resolving the contradiction between needing high tearing force and keeping the structure simple.
Solution Approach 2:
Multiple conveyor rollers are combined to work together as a unified conveying system. The cumulative effect of multiple rollers provides the necessary tearing force to prevent paper slipping, while each individual roller remains structurally simple. This merging approach achieves high force output without complicating the basic roller design.
2Productivity
If the staple removing edge is positioned close to the cutters to effectively block staples, then the staple removal efficiency is improved, but the risk of staples damaging the cutters increases
Solution Approach 1:
The staple removing edge is positioned to block staples before they reach the cutters, performing the staple removal action in advance. This preliminary blocking prevents staples from potentially damaging the cutters while maintaining efficient staple removal, as the edge intercepts staples at an optimal position that balances effectiveness with safety.
Solution Approach 2:
The staple removing edge acts as an intermediary element between the paper stack and the cutters. It intercepts and blocks staples before they can reach the vulnerable cutter area, serving as a protective mediator that enables efficient staple removal without exposing the cutters to harmful factors.
3Reliability
If a larger tearing force is applied to remove staples, then the paper feeding reliability is improved, but the risk of paper deformation or damage increases
Solution Approach 1:
The tearing force is segmented and distributed across multiple conveyor rollers rather than being applied by a single high-force element. This segmentation allows the force to be applied gradually and uniformly, ensuring reliable paper feeding while preventing localized stress that could deform or damage the paper.
Solution Approach 2:
The conveyor rollers provide dynamic, controlled force application that adapts to the paper stack. The rotational motion of multiple rollers delivers tearing force in a controlled manner, achieving reliable staple removal and paper feeding while maintaining paper integrity through gradual, distributed force rather than sudden, concentrated stress.
Data Source
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AI summary
Provided is a paper shredder, belonging to the technical field of paper shredding. A housing (110, 120) of the paper shredder is provided with a paper feeding slot for passing stack of paper, a conveyer (300) for driving the stack of paper to move is disposed inside the paper feeding slot, two cutters (200) are used for shredding the stack of paper, a staple removing structure (500) is disposed on a first wall (101), and a staple removing edge (501) of the staple removing structure (500) is disposed inside the paper feeding slot to form a step structure. The staple removing edge (501) is spaced from a second wall (102), and the clearance between the staple removing edge (501) and the second wall (102) is used for paper feeding. In addition, in the conveying direction of the stack of paper, the distance from the two cutters (200) to the staple removing edge (501) is less than the length of the stack of paper.