TORSION SPRING TYPE ROTARY DECORATION DRIVING DEVICE

摘要

PURPOSE: To simply adjust a rotational period by arranging a rotational period adjusting member movable in the vertical direction by force not less than frictional force with springs in the middle of plural torsion springs suspended from the same circumference of a torsion spring support member. ;CONSTITUTION: A central part of a disk-shaped torsion spring support member 1 is supported with a column 7, and four small holes 1a are arranged on the same circumference in the vicinity of the outer periphery of the member 1, and four torsion springs 2 are suspended by penetratingly passing through these, and the upper parts are fixed. A disk-shaped rotational period adjusting member 5 is inserted in the middle of the springs 2, and a through hole 5b to penetratingly pass the column 7 is arranged in the central part, and small holes 5a are arranged to insert the respective springs 2. When a rotational period is desired to be changed, the member 5 is vertically moved by force not less than frictional force between the small holes 5a and the respective springs 2, and a spring constant and a gravity center position of the whole vibrating system are changed, and the rotational period is changed. Thereby, the rotational period can be changed without changing lengths of the torsion springs 2.;COPYRIGHT: (C)1995,JPO