Shredder Auto Feed System with Elastic Arm Mechanism
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Solution Overview
Problem
Existing shredders require manual feeding of paper sheets, which reduces productivity as users need to spend time inserting sheets one at a time, and automatic feeders are not universally efficient in handling varying paper sizes and types.
Innovation Solution
A shredder with a movable feed mechanism featuring elastic arms that automatically advance paper sheets from a tray into rotating cutter elements, using a feed driver system to apply pressure and frictionally feed the sheets, and a disengagement mechanism to prevent feeding when the drawer is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual feeding is used, then device complexity is reduced, but productivity decreases due to time spent inserting sheets one at a time
Solution Approach 1:
The feed members are designed to automatically engage with the paper stack and feed sheets into the cutters without requiring external control mechanisms. The elastic arms self-adjust to paper thickness and the rotation of feed members continuously advances paper, creating a self-regulating feeding system that improves productivity while maintaining simplicity
Solution Approach 2:
The feed members incorporate elastic arms that can dynamically adjust their position and pressure based on paper stack conditions. This dynamic flexibility allows the simple feed mechanism to adapt to varying paper types and sizes, maintaining high productivity without adding complex control systems
2Productivity
If automatic feed mechanism is added, then productivity improves, but device complexity increases
Solution Approach 1:
The feeding function is merged with the cutting operation by positioning feed members directly adjacent to the cutter elements. The feed members rotate in coordination with cutter rotation, combining two functions into a synchronized system that improves productivity without requiring separate complex feeding mechanisms
Solution Approach 2:
The feed mechanism uses the rotational motion of the cutters themselves to drive the feeding action through engaged feed members. This self-driven approach eliminates the need for separate motors and control systems, achieving automatic feeding while maintaining device simplicity
3Ease of operation
If elastic arms are used to engage paper stack, then ease of operation improves, but reliability may worsen due to potential jamming
Solution Approach 1:
The feed members rotate periodically, creating cyclical engagement and disengagement with the paper stack. This periodic motion naturally prevents continuous pressure that could cause jamming, while still providing sufficient friction to advance paper reliably. The rhythmic feeding action accommodates various paper types without compromising reliability
Solution Approach 2:
The elastic arms change their physical state (compressed vs. relaxed) during the rotation cycle, adjusting pressure parameters dynamically. When engaged, they apply sufficient friction for easy feeding; when disengaged, they release pressure to prevent jamming. This parameter variation resolves the contradiction between ease of operation and reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient, automatic shredding of paper sheets without manual intervention, improving productivity by allowing continuous operation and handling different paper sizes and types, while preventing jamming and ensuring easy operation.
Implementation Method 1
the at least one elastic arm thereof elastically deforming to apply pressure and frictionally feed paper sheets atop the stack to the cutter elements
Implementation Method 2
the at least one elastic arm thereof elastically deforming to apply pressure and frictionally feed paper sheets atop the stack to the cutter elements
Data Source
AI summary
A shredder has cutter elements for destroying articles (paper) and a feed mechanism for advancing paper from a stack in a tray into cutters for shredding. The feed mechanism has a feed member provided adjacent to the tray with an elastic arm for engaging and disengaging the stack. The feed member rotates in a feeding direction about an axle, with the elastic arm elastically deforming to apply pressure to feed paper atop the stack to the cutters. The elastic arm can include a protruding tip that is inserted into the stack. The tray includes a curved feed bed to assist in feeding paper into the cutters and deforming the elastic arm. A pivot arm can also move the feed member relative to the tray (e.g., vertically). A disengagement mechanism can hold the feed mechanism in an inoperable feeding position when a drawer or tray is moved into an open position.