Design Project II: Velocity Measurement Mechanism
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Transcript of Design Project II: Velocity Measurement Mechanism
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Section 10, Team 3:Caroline Suni, Clayton Dickerson, Alex Bedrin, and Donovan Killeen
*Design Project II:Velocity Measurement Mechanism
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*ABSTRACT
*Designed and built a prototype of a velocity measurement mechanism*Installed directly into Xerox iGen4*Current mechanism is imprecise*Mechanism can measure velocity +/- 0.25%
tolerance*Key points:*easy to install*maintenance*cost effective
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*PROCESS/INTRODUCTION
*Generated 5 unique designs for measuring velocity within the iGen4*one design selected
*Winning design implements the use of a roller, notch and sensor *Prototype, 3d models and working drawings were
created
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*DESIGN TASK
*Problem Statement*Current device yields rough estimates
*Mission Statement*Design a device that measures velocity between
250 to 750 mm/s within a tolerance of +/- 0.25%*Design Specifications*Precise velocity*Cost effective*Easy manufacture, installation and maintenance*No impact on paper speed*Appropriate size
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*DESIGN PROCESS
*GANTT CHART:
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*Concept Generation
Double motion sensor
Roller notch sensor
Rolling notch switch
Single motion sensor
Ultrasonic sensor
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*Design Matrices
Selection Criteria Single Motion Sensor Double Motion Sensor Roller Notch Switch Roller Notch Sensor Ultra Sonic Sensor(reference)
Cost Effectiveness 0 - + - +Precision 0 + - + -Maintenance 0 0 + 0 0Size 0 - + + 0Ease of Manufacture 0 0 + 0 0Ease of Installation 0 - + - 0
Sum +'s 0 1 5 2 1Sum 0's 6 2 0 2 4Sum -'s 0 3 1 2 1
Net Score 0 -2 4 0 0Rank 3 4 1 2 2
Continue? no no yes yes yes
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*Second Design Matrix
Selection Criteria Weight (%) Rating Weighted Score Rating Weighted Score Rating Weighted Score
Cost Effectiveness 0.15 4 0.6 3 0.45 3 0.45Precision 0.3 2 0.6 5 1.5 2 0.6Maintenance 0.1 3 0.3 3 0.3 2 0.2Size 0.25 3 0.75 3 0.75 2 0.5Ease of Manufacture 0.1 3 0.3 2 0.2 2 0.2Ease of Installation 0.1 3 0.3 3 0.3 3 0.3
Total Score 2.85 3.5 2.25Rank 2 1 3
Continue? no YES no
ConceptsRoller Notch Switch Roller Notch Sensor Ultra Super Special Sonic Sensor
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*Trade Studies
*Lasers are most accurate form of measurement*Most cost effective*Most efficient
*Rotating notch best way to measure velocity of paper*Design much more accurate than current
igen mechanism
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*Best Design Selected
*Utilizes dual set of frictionless rollers*Located after drive roll*Spin according to speed of paper
*Notch connected to rod breaks plane of laser*Occurs on each pass of the notch/roller system
*Program measures average rotations per second and derive the velocity of the paper
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*PROTOTYPE
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*prototype
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*Solidworks models
Prototype
Velocity Roller
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*ENGINEERING ANALYSIS
*Working Mechanism:*Printer begins print cycle*Laser activates
*Paper is fed into printer and cycle begins*Paper passes velocity measuring mechanism, and spins a
“frictionless” roller*Notch on the end of the roller breaks the plane of the
sensor as the paper spins it*Sensor measures time intervals of the notch rotating
around the cylinder exactly once*Program divides this time by known circumference of rotating
notch* … yielding an accurate average speed
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*Cost Analysis
Cost based on estimations with help from:-Mcmaster-carr (http://mcmaster.com)-Rubber Crumb, Recycled Rubber(http://www.tirerecyclingcrumbrubbershredder.com)
Part Material Material CostAmount of Material Cost Quantity
Total Cost
(cubic inch or per item) (cubic inches) ($) ($)Roller Rubber $0.44 11.5 5.06 2 10.12Lazer $60 60.00 1 60
Sensor $250 250.00 1 250
Notch Stainless Steel$2.18
0.2 0.44 1 0.44
Rod Stainless Steel$2.18
1.325 2.89 2 5.777
Total Cost : $326.34
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*Design Features
*Cost Effective*Easy Maintenance*Compact Size, only 1.5 x 1.75 x 3.25
inches*Easy to Manufacture*Easy to install*Accurate
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*SUGGESTIONS
*Decreasing the diameter of the rod holding the notch*More rotations = more accurate*Closer estimation of rotations
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*CONCLUSIONS
*Team 3 designed and built a prototype of a system that measures the velocity of paper in the igen 4*Velocity information used to make
adjustments in the printing path*Less errors with image recognition
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*ACKNOWLEDGEMENTS &
REFERENCES
*Xerox*Xinli Wu*Our TA, Bill
*Full Xerox igen 4 demo: http://www.youtube.com/watch?v=R6HBoQTPhdU
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Thank you for watching our presentation
*Questions?