Matt Brady James Gallo Jon Lesner Alex Quehl Engineering-Design 100, Section 10 Group 2 Xinli Wu The Pennsylvania State University

 Need for a more accurate velocity measurement allows for:  Higher-quality picture (micron tolerances)  Better handling of paper while being printed  Due to wear and tear, centripetal velocity of rollers changes as time progresses  Without accurate velocity, distorted picture is likely

 Design measuring paper velocity  Measures velocity 3 times:  Time beam of laser 1 is blocked from sensor 1  Time beam of laser 2 is blocked from sensor 2  Time between lasers  Paper length and distance between lasers are both constant  Time /distance = velocity  Finds the mean of all 3, minimizing chance for a flawed calculation

 2 rollers in front  2 rollers in back  2 lasers located between front and back rollers  Fixed distance is needed to find velocity  Sensor corresponding to each laser  Baffle to guide the paper  Framing

 Internal clock able to measure to the millisecond  First, it takes 4 time measurements, then calculates 3 velocities, using d /∆t (distance / change in time), where:  d 1 = d 2 = mm (i.e., length of paper)  d 3 = 63.5 mm (i.e., distance between sensors)  ∆t 1 = t b – t a  ∆t 2 = t d – t c  ∆t 3 = t c - t a

Start Time of Sensor 1 (t a ) End Time of Sensor 1 (t b ) Start Time of Sensor 2 (t c ) End Time of Sensor 2 (t d ) 3:06:23:1253:06:23:7413:06:23:2673:06:23:893 Velocity 1Velocity 2Velocity 3Mean Velocity mm s mm s 63.5 mm s v 1 + v 2 + v mm/s mm/s mm/s mm/s ∆t 1 = t b - t a ∆t 2 = t d – t c ∆t 3 = t c - t a s0.626 s0.142 s

 Optimal accuracy, considering the relatively small number of resources used  Eliminates the risk that comes with taking just one measurement  Ideal for a printer with such a great need for super-precise calculations