Electrophotographic Cascade Development Apparatus Project Review - - - PowerPoint PPT Presentation

Electrophotographic Cascade Development Apparatus

Team 15503:Zach Foggetti (ME) Dalton Mead (ME) Bridget Kearney (EE) Ruishi Shen (ISE) Tom Wossner (ME)

Project Review - May 12, 2015

Customer/Sponsor: Dr. Marcos Esterman

• Dr. Shu Chang

Faculty Guide: Sarah Brownell

Agenda

• Background
• Project Overview
• Customer Needs
• Engineering Specs
• Concept Selection & Final Product
• Project Status
• Testing Results
• Major Issues and Findings
• Overall Evaluation & Future work
• Recommendations

Background

The focus of this project is the redesign and construction of a xerographic device, called an Electrophotographic Cascade Development Apparatus (ECDA). The ECDA is a piece of test equipment that enables the user to determine whether a specific material is able to be printed onto a surface by means of electrophotography. Such a device is currently being used by RIT faculty and graduate students. However, there is much that can be done to improve the device’s functionality. The new design will allow the user to explore

• ptions beyond regular toner particles, such as copper, silver, steel, and other

metal or metal alloys.

Project Overview - Old Device

Old Device

• Results hard to view
• Development zone plates irreplaceable
• Required functionality not provided
• Parallelism between plates not guaranteed
• Flow of particles impeded due to transfer surface

friction

• Particles hard to be collected after testing

Customer Needs Checklist

• The device must be safe to use
• The device must control the flow of particles
• The device must reduce or eliminate particles lost
• The device must allow easy access to the test sample
• The device must automate as many processes as possible
• The device must handle a range of particle sizes
• The device must be easy to use
• The device must handle the required voltage
• The device must handle large particle samples
• The device must transfer particles using electrophotography
• The device must prevent particle clumping
• The device must allow for a range of spacings between the

charged and grounded plates

• The device must handle different types of materials
• The device must allow the charged plates to be easily replaced

Original Engineering Specs

Final Engineering Specs

Reasons for Changes:

• Time constraint and lack of

manpower

• we were not able to

accomplish the hopper subsystem

• We were not given the desired

types of particles to perform the test

• We were not able to find the

benchmark to assess the electrical safety score

• Transfer surface
• Aluminum plate
• Ground to achieve smooth surface finish
• Parallel set
• Used to simultaneously raise and lower both sides of the upper charged plate
• Ensures upper plate is parallel to lower plate
• Angle - rope & cleat
• Allows transfer surface angle to be easily adjusted
• Metal clips for development zone
• Provides contact points to deliver charge to the upper and lower plates

Concept Selection

Final Product - Our Design

• Results easy to view
• Development zone plates removable
• Required functionality provided
• Parallelism between plates
• Percentage of particles stuck on the transfer

surface greatly reduced (~4%)

• Particles can be collected after testing

Final Product - Our Design

Video:

https://drive.google.com/drive/u/1/folders/0B6O8495bKQ4FY3VvdDhPQ0ViR2s /0B8yBiP- JaMe5NDdSeGFvZkE2dU0/0B6O8495bKQ4FfjJZd0R2T19nbmNRMmFTeWtV ODVKdDBnSjF6LWdFY0pjakR4T3hleDg2RkU/0Bx0fpCwe6CadfmJvOHJta0Vi XzN2N3ZsVjlMWEhTOXEwVWNzd3Y2Rmd1cU1RYWFhSVV0ckE

Project Status

• The final product performs electrophotography well
• Subsystems of transfer surface and development zone are a success
• We did not have enough time to finish the hopper subsystem
• We were able to establish a continuous angle system
• Budget
• Originally $2500, then cut down to $1500

Key Testing Results

• Only requires 48 seconds (on average) to set up the device before running

tests

• Only 4.32% of particles per test (on average) are stuck to transfer surface
• Nearly 0% of particles per test are lost through the system
• Only requires less than 2 seconds (on average) to view the results
• Only requires 13 seconds (on average) to swap out the development zone

Major Issues and Findings

• We lost a team member at the beginning of MSD II
• Lack of manpower and time constraint caused incompletion of hopper

system

• We failed to purchase all our parts with the right thickness at the beginning
• Fortunately this did not cause too much machining trouble; machine

shop has the material with right thickness

Overall Evaluation & Future Work

• Completed subsystems meet all the critical customer needs and

engineering specs

• Future work
• Automate the angle system
• Connect the device with computer using LabVIEW so it can be fully

controlled and evaluated

Learnings & Recommendations

• What have we learned?
• Some ideas were too lofty; should have considered time constraints

more carefully

• Talk to SMEs earlier and more often
• Things often take longer than expected; leave time in the project plan

to deal with the unexpected

• Recommendations for MSD program
• PRP (ours at least) could have been more thorough/accurate/helpful
• End of MSD I evaluation process could have been more thorough (we

had some catching up to do in MSD II)

Questions?