Adjustable Paper Limiter Blocks for Shredder Jam Prevention
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Solution Overview
Problem
Existing paper shredders lack a mechanism to effectively limit the length and thickness of stacked paper, leading to potential jamming and inefficient shredding.
Innovation Solution
A paper shredder with a paper limiter system that includes main and auxiliary paper limit blocks, height limit blocks, and a pressing plate with rollers, which guide and clamp the paper to prevent overloading and ensure proper shredding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no paper limiter is provided, then the paper tray can accommodate papers of any length and thickness, but paper jams occur and shredding efficiency decreases
Solution Approach 1:
The paper limiter is divided into multiple independent limit blocks (first limit block, second limit block, third limit block) that can be individually adjusted. Each block can be independently positioned to limit paper length, width, or thickness, allowing flexible adaptation to different paper sizes without requiring a completely different limiter structure.
Solution Approach 2:
The limit blocks are designed to be movable and adjustable rather than fixed. The blocks can be repositioned along guide rails or removed entirely to accommodate different paper dimensions, transforming the limiter from a static structure to a dynamic, adaptable component that maintains reliability across various operating conditions.
2Adaptability or versatility
If a fixed paper limiter structure is used, then the structure is simple, but it cannot adapt to papers of different lengths and thicknesses
Solution Approach 1:
The paper limiter is designed with multi-functional limit blocks that can serve different purposes depending on their position and configuration. The same limit block structure can limit paper length when positioned horizontally, limit width when positioned vertically, or limit thickness when stacked, making the limiter universally applicable to various paper size requirements.
Solution Approach 2:
Multiple limit blocks are designed to be nestable or stackable within the paper tray. The blocks can be arranged in nested configurations where smaller blocks fit within or alongside larger blocks, allowing compact storage when not in use and flexible deployment when needed, thus achieving versatility without excessive structural complexity.
3Ease of operation
If the paper tray accepts unlimited paper stacks, then loading is convenient, but the shredder motor overloads and performance deteriorates
Solution Approach 1:
The paper limiter blocks are pre-positioned in the paper tray before paper loading occurs. By establishing the size and thickness limits in advance, users are guided to load appropriate amounts of paper, preventing overload conditions before they occur. This preliminary action maintains ease of loading while protecting the motor from excessive power demands.
Solution Approach 2:
The paper limiter blocks act as an intermediary between the user loading paper and the motor shredding it. The blocks physically intervene to prevent excessive paper accumulation, thereby mediating the interaction between loading convenience and motor power protection, ensuring neither extreme occurs.
Data Source
AI summary
A paper shredder has a paper tray, a paper inlet, a shredder cover, a paper pressing plate, paper pick-up rollers, a shredder cutter shaft, a motor, a wastepaper barrel, and a paper limiter. The paper tray carries a stack of to-be-shredded paper. The paper inlet guides to-be-shredded paper. The shredder cover end is connected to the shredder body by a rotary shaft, closing or opening the shredder body. The paper pressing pl presses the stack in the paper tray. The paper pick-up rollers are on one side of the paper inlet, feeding the paper tray stack into the paper inlet. The shredder cutter shaft shreds the to-be-shredded paper. The motor drives the shredder cutter shaft to operate. The wastepaper barrel is located below the paper inlet to collect shredded paper. The paper limiter is limits one of a thickness or a length of the stack placed in the paper tray.