Shredder Jam-Proof Thickness Detection Mechanism
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Solution Overview
Problem
Shredders often jam or damage when attempting to shred articles that are too thick, as existing technologies lack effective thickness detection and resistance mechanisms to prevent such occurrences.
Innovation Solution
A shredder system incorporating a contact member with a resistance generating mechanism, featuring a first and second spring mechanism to provide varying resistance based on article thickness, along with a sensor to measure displacement and alert the user or adjust the shredder's operation, preventing jamming and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring mechanism is used to detect article thickness, then the device complexity is reduced, but the measurement precision and reliability of thickness detection deteriorates
Solution Approach 1:
The detection mechanism is segmented into two distinct spring mechanisms: a first spring for initial contact and a second spring for additional thickness detection. This segmentation allows each spring to be optimized for specific displacement ranges, improving overall measurement precision while maintaining manageable device complexity through modular design
Solution Approach 2:
The system dynamically transitions between two spring mechanisms based on the displacement magnitude. For small displacements, only the first spring is engaged; for larger displacements, the second spring becomes active. This dynamic configuration allows the system to adapt its stiffness characteristics to the specific measurement requirements, enhancing precision across different thickness ranges
2Reliability
If high resistance is applied to the contact member to prevent jamming, then the reliability of the shredder improves, but the ease of operation deteriorates as users cannot insert articles smoothly
Solution Approach 1:
The resistance force is applied locally and selectively through the spring mechanisms only when and where needed - specifically when article thickness exceeds safe limits. Normal thin articles experience minimal resistance, while thick articles that could cause jamming trigger the resistance mechanism. This localized application of resistance maintains ease of operation for valid inputs while protecting against harmful inputs
Solution Approach 2:
The spring mechanisms provide preliminary resistance before the shredder mechanism engages with overly thick articles. By detecting excessive thickness in advance and applying resistance at the contact member, the system prevents jamming conditions from developing, thereby protecting the shredder mechanism while allowing normal operation to proceed smoothly
3Device complexity
If no thickness detection system is used, then the device complexity is minimized, but the shredder mechanism and motor are damaged by attempting to shred articles that are too thick
Solution Approach 1:
The spring-based thickness detection system performs preliminary measurement of article thickness before the shredder mechanism engages. The contact member with its spring mechanisms detects excessive thickness in advance, allowing the control system to prevent operation on unsuitable articles, thereby protecting the shredder mechanism and motor from damage
Solution Approach 2:
The contact member with spring mechanisms serves as an intermediary between the user-input article and the shredder mechanism. This intermediary detects article thickness and transmits appropriate signals to the control system, enabling informed decisions about whether to proceed with shredding, thus protecting the expensive shredder mechanism from damaging thick articles
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 system effectively prevents jamming and motor damage by providing immediate feedback and adjusting the shredding process based on article thickness, ensuring safe operation and efficient shredding of documents and other materials.
Implementation Method 1
a first spring configured to resist displacement of the contact member at least up to a predetermined displacement; and a second spring configured to resist displacement of the contact member beyond the predetermined displacement
Implementation Method 2
a sensor configured to measure a displacement of the contact member, the sensor comprising: (i) a pair of first elements spaced apart for one another; and (ii) a second element moveable with the displacement of the contact member so as to be displaced between the pair of first elements, wherein each of the first elements is one of a magnet and a Hall effect sensor, and the second element is the other of a magnet and a Hall effect sensor
Data Source
AI summary
A shredder has a jam proof system with a thickness detector having a contact member which displaces as an article is inserted into the shredder and a resistance generating mechanism which provides a resistance force to the contact member, in response to its displacement. The greater the thickness of the article, the greater the resistance force realized. When a predetermined thickness is reached, there is a significant change in the resistance force. The resistance generating mechanism may include at least two spring mechanisms and provide feedback to the user that the inserted article may be too thick. In addition, the thickness detector may include a thickness sensor. The sensor may communicate with a controller to alert the user, and/or alter the operation of the shredder, in response to the thickness of the inserted article. For example, the controller may visually and/or audibly alert the user, or control shredder motor response.