| 摘要 |
PURPOSE:To secure such a paper feeder that is simple in structure, compact in size, lighter in weight and high in efficiency by constituting each projection in at least two loop positions of high-order flexural vibration, pressurizing a sheet of paper and holding it between for conveying. CONSTITUTION:Support grooves 15a, 15b of a vibrator 16 are installed in correspondence to a node position of the flexural vibration, and cylindrical projections 14a, 14b are set up in correspondence to a loop position of the flexural vibration. Then, the vibrator 16 is positioned and fixed by a support block 17 via the support grooves 15a, 15b. Thus, paper 18 is pressurized and placed on the cylindrical projections 14a, 14b and this support block 17, and an ac electric field in and around resonance frequency of the vibrator 16 is impressed on a piezoelectric body tightly attached to a prismatic vibrator constituting the vibrator 16. With this constitution, since the cylindrical projections 14a, 14b vibrates in describing an almost circular locus to the prismatic vibrator 16 within a vertical plane, the paper 18 can be moved in an arrow direction. |
