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Devices to feed along microparts, such as ceramic chip capacitors and resistors, have become more common, due to their use in sorting, inspecting, and shipping mass produced microparts. In microparts feeding, to feed along microparts in one direction, the driving force applied to each micropart must vary according to the direction of movement of the micropart. Especially, the movement of microparts smaller than submillimeter can be affected not only inertia but also adhesion which is caused by electrostatic, van der Waal's, intermolecular, and surface tension forces (Ando, 1997). Therefore, we need to derive dynamics including adhesion to evaluate the movement of microparts. We have previously shown that a sawtoothed surface with simple planar and symmetric vibrations can be used to feed along microparts (Figure 1) (Mitani, 2006). In this case, contact occurs in one of two ways: point contact, the point of the tooth contacts the fed part, and slope contact, the sloping side of the tooth contacts the micropart. Because of the difference in contact area of micropart with the sloping side of a tooth and with the other side, microparts adhere more strongly in one direction than in the other. Also, the driving forces transferred from vibrations of feeder surface vary according to contact. These result in the microparts moving in one direction with simple planar symmetric vibrations.

Unidirectional Feeding of Submillimeter Microparts Along a Sawtooth Surface with Horizontal and Symmetric Vibrations