Xerox Project:Velocity Measurement & Correction

System (VMCS)By: Dennis Funk, John Hewertson, Nick

Petrunyak, and Matthew Svinte

Mission Statement

The mission of this project is to design and build a prototype of a velocity measurement system that does not affect the speed of the paper and can determine the velocity of an 8.5”×11” sheet of paper traveling between 250 and 750 mm/s with no more than ±0.25% error

Gantt Chart

Sketches

Sketches

Final Sketch

Criteria Weight

Design 1 Design 2 Design 3 Design 4 Design 5

Rating

Weighted Score

Rating

Weighted Score

Rating

Weighted Score

Rating

Weighted Score

Rating

Weighted Score

Determination of velocity 0.3 2 0.6 3 0.9 4 1.2 4 1.2 5 1.5

Speed between 250 and 750 mm/s 0.2 4 0.8 1 0.2 1 0.2 4 0.8 4 0.8

Error less than ±0.25% 0.3 1 0.3 2 0.6 3 0.9 4 1.2 5 1.5

Simple paper path 0.1 3 0.3 3 0.3 3 0.3 3 0.3 3 0.3

System not affect speed 0.1 4 0.4 4 0.4 4 0.4 5 0.5 5 0.5

Total Score     2.4  2.4  3.0  4.0  4.6

Rank     4  4  3  2  1

Continue?     No   No   No   No   Yes

Design Matrix

3D Rendition

Design Specifications and Features

Design Specifications:• Must determine the velocity of a 8.5”×11” sheet of paper• Velocity must be between 250 and 750 mm/s• No more than ±0.25% error• Simple paper path with a baffle between drive rolls • Must not affect the speed of the paper

Design Features:• Determines velocity within ±0.25% error• Keeps paper at a velocity between 250 and 750 mm/s• Simple paper path with hand fed system • Velocity correction system slows or speeds rotation of the

wheels if velocity is unacceptable

Estimated Cost: $35 – $40

Laser shoots from bottom of track to a light sensor on the top

Sensor measures intensity Paper passes over the laser,

blocking the light Sensor detects drop in

intensity and timer starts Timer stops after paper

passes and the intensity returns to normal

Velocity is determined using distance divided by time

Velocity Measurement

The Math Behind It

𝑆𝑝𝑒𝑒𝑑=∆ 𝑥∆ 𝑡

Length of paper

Time recorded by system

Testing

0 5 10 15 20 25 30 35 40600

620

640

660

680

700

720

740 Velocity Measurment Test

Paper Feeds

Pape

r Ve

loci

ty (

mm

/s)

Average Velocity for Run: 682.49 mm/s

Now that we have this data…

What can we do with it?

The recorded velocity is compared to the accepted values

If it is within the range, the wheels remain at the same speed

If it is outside the range, the wheels accelerate or decelerate accordingly

Not part of the working prototype

Velocity Correction