Patent ID: 7213479
Filing Date: 2007-05-08
Classification: E01C,E02D,Y10T

Abstract:
1. A vibratory mechanism comprising: first and second vibratory shafts, which are stored within a roll and are arranged symmetrically across a rotation axis of the roll, and are rotated in a same direction during operation of said mechanism; fixed eccentric weights fixed to respective ones of the first and second vibratory shafts; rotatable eccentric weights rotatably attached to respective ones of the first and second vibratory shafts; rotation controllers controlling a range of movement of the rotatable eccentric weights; and an eccentric moment controller which changes an eccentric moment around the first and second vibratory shafts depending on a rotation direction of the first and second vibratory shafts, whereby the roll vibrates in all radial directions when the first and second vibratory shafts rotate in one direction, and the roll vibrates in a direction tangential to the circumference of the roll when the first and second vibratory shafts rotate in a reverse direction, wherein a total eccentric moment around the first vibratory shaft is substantially the same as a total eccentric moment around the second vibratory shaft when the first vibratory shaft and the second vibratory shaft are rotated in the one direction, a total eccentric moment around the first vibratory shaft is substantially the same as a total eccentric moment around the second vibratory shaft when the first vibratory shaft and the second vibratory shaft are rotated in the reverse direction, wherein the total eccentric moment around the first vibratory shaft is obtained by subtracting an eccentric moment of the fixed eccentric weight from an eccentric moment of the rotatable eccentric weights and the total eccentric moment around the second vibratory shaft is obtained by subtracting an eccentric moment of the rotatable eccentric weights from an eccentric moment of the fixed eccentric weight, when the first vibratory shaft and the second vibratory shaft are rotated in the one direction, and the total eccentric moment around the first vibratory shaft is obtained by adding an eccentric moment of the fixed eccentric weight to an eccentric moment of the rotatable eccentric weights and the total eccentric moment around the second vibratory shaft is obtained by adding an eccentric moment of the rotatable eccentric weights to an eccentric moment of the fixed eccentric weight, when the first vibratory shaft and the second vibratory shaft are rotated in the reverse direction.