Feeding Submillimeter Microparts Along a Saw-Tooth Surface Using Only Horizontal Vibration: Effects of Saw-Tooth Pitch, Vibration Frequency, and Humidity
Atsushi Mitani*, Toshiatsu Yoshimura**, and Shinichi Hirai**
*Department of Design, Sapporo City University, Sapporo, Hokkaido 005-0864, Japan
**Department of Robotics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
We previously showed that microparts can be fed along a saw-tooth surface using simple planar symmetric vibration. Microparts move forward because they adhere to the saw-tooth surface more backward than forward. We studied also the effects of saw-tooth pitch and vibration frequency on the movement of 2012 capacitors (2.0 × 1.2 × 0.6 mm, 7.5 mg). In the present work, we studied the movement of smaller 0603 capacitors (0.6 × 0.3 × 0.3 mm, 0.3 mg) compared to larger capacitors. We also measured the effect of ambient humidity on smaller capacitors, finding that feeding was fasted when the pitch was 0.05 mm. Smaller capacitors moved more slowly than larger ones because smaller ones were more affected by adhesion. Feeding velocity of smaller capacitors was thus affected greatly by ambient humidity.