Piezoelectric driven type vibratory feeder

A piezoelectric driven type vibratory feeder comprising:

• a base;
• a plurality of first plate springs, with a lower end portion of each of said plurality of first plate springs being secured to the base;
• a working mass member connected to an upper end portion of each of said plurality of first plate springs, said working mass member being supported at said base so that said working mass member can vibrate;
• a plurality of second plate springs, with an upper end portion of each of said plurality of second plate springs being secured to said working mass member;
• a single opposing mass member, with a lower end portion of each of said plurality of second plate springs being connected to said single opposing mass member;
• a piezoelectric device bonded to at least one surface of each of said plurality of second plate springs;
• and
• alternating voltage applying means for applying alternating voltage to each piezoelectric device;
• wherein, by applying the alternating voltage to said piezoelectric device, each of said plurality of second plate springs undergoes bending vibration, causing said working mass member to vibrate by the bending vibration, so that an object is transported on said working mass member.