Paper Alignment Sensor Arrangement for Shredder Jam Prevention
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Solution Overview
Problem
Shredders often jam when misaligned articles, such as papers fed at an angle, leading to user frustration and mechanical issues.
Innovation Solution
A shredder equipped with sensors along the throat to detect the insertion of articles, including alignment and thickness sensors, which communicate with a controller to prevent jamming by adjusting the motor operation based on the alignment and thickness of the articles, alerting the user to properly align the paper before shredding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If articles are fed into the shredder without alignment detection, then the shredder can operate continuously, but jamming occurs when misaligned articles are shredded
Solution Approach 1:
The sensor arrangement detects article alignment before the shredding operation begins. The system performs preliminary detection of whether articles are properly aligned with the throat, and only initiates motor operation when alignment is confirmed, preventing jamming before it occurs.
Solution Approach 2:
The sensor arrangement provides feedback to the controller about article alignment status. The controller receives signals from sensors positioned along the throat that detect whether articles are properly aligned, and adjusts motor operation accordingly to prevent jamming.
2Reliability
If sensors are added to detect article alignment, then jamming is prevented, but device complexity increases
Solution Approach 1:
The sensor arrangement is divided into multiple discrete sensors positioned at different locations along the throat. Each sensor independently detects alignment at its position, and the controller integrates these segmented detection signals to determine overall article alignment status.
Solution Approach 2:
The sensor arrangement serves multiple functions: detecting article presence, determining alignment status, and providing feedback for motor control. This multi-functionality reduces the need for separate detection systems and minimizes overall device complexity.
3Reliability
If the motor is controlled based on sensor detection, then misaligned articles are prevented from being shredded, but response time is reduced
Solution Approach 1:
Alignment detection is performed preliminarily before the shredding cycle begins. The sensors detect whether articles are properly aligned during the feed phase, and the controller prepares the motor for operation only when alignment is confirmed, eliminating delays during the actual shredding process.
Solution Approach 2:
The sensor detection and motor control operate continuously during the article feeding phase. As articles are fed into the throat, sensors continuously monitor alignment status, allowing the system to maintain readiness for immediate motor activation without interrupting the feeding workflow.
Data Source
AI summary
A shredder includes a housing having a throat for receiving at least one article to be shredded and a shredder mechanism received in the housing. The shredder mechanism includes a motor and cutter elements, and enables the articles to be shredded to be fed into the cutter elements. The motor is operable to drive the cutter elements so that the cutter elements shred the articles into shredded particles. The shredder also includes a plurality of sensors provided along the throat for sensing articles. A controller is coupled to the motor and the sensors, the controller being configured to perform a predetermined motor control operation of the motor responsive to the sensors sensing the articles inserted into the throat at an angle above a predetermined angle threshold or the sensors sensing with a predetermined sensing pattern the at least one rectangular sheet of paper inserted into the throat.