Vibration sheet feeder

A sheet feeding apparatus, comprising:

• (a) first vibration means having a projection formed by grooves, said first vibration means producing a first travelling vibration wave in response to an electrical signal supplied thereto;
• (b) second vibration means having a projection formed by grooves provided at a portion across the sheet from said projection of said first vibration means, said second vibration means generating a second travelling vibration wave proceeding in the same direction as said first travelling vibration wave in response to an electrical signal supplied thereto;
• and
• (c) means for substantially making a peak of the first travelling vibration wave and a peak of the second travelling vibration wave correspond with each other, whereby the sheet inserted between the projection of the first vibration means and the projection of the second vibration means is fed by the first and the second travelling vibration waves.

A sheet feeding apparatus, comprising:

• (a) first vibration means having projections, said first vibration means producing a first vibration in response to an electrical signal supplied thereto;
• (b) second vibration means having projections provided at a portion across the sheet from said projections of said first vibration means, said second vibration means generating a second vibration proceeding in the same direction as the first vibration in response to an electrical signal supplied thereto;
• and
• (c) means for substantially making a peak of the first vibration and a peak of the second vibration correspond with each other, whereby the sheet inserted between the projections of said first vibration means and the projections of said second vibration means is fed by the first and the second vibrations.