Sheet feeding apparatus using a vibration wave to convey sheets

An apparatus for feeding a material, comprising:

• (a) a first vibration member for feeding a material in contact therewith, said first vibration member including a first group of polarized electromechanical energy converting devices and a second group of polarized electromechanical energy converting devices;
• and
• (b) a second vibration member for feeding the material which is in contact therewith, said second vibration member including a first group of polarized electromechanical energy converting devices, each of which correspond in location within said second vibration member to an electromechanical energy converting device in the first group of said first vibration member, and a second group of polarized electromechanical energy converting devices,
• wherein the polarities of the converting devices of the first group of said first vibration member are opposite to the polarities of the corresponding converting devices of the first group of said second vibration member and
• wherein each electromechanical energy converting device in the second group of said second vibration member corresponds in location within said second vibration member to an electromechanical energy converting device in the second group of said first vibration member, and wherein the polarities of the converting devices of the second group of said first vibration member are the same as the polarities of the corresponding converting devices in the second group of said second vibration member.