Patent ID: 8783958

Claim:
A rolling device comprising: a transfer path made up of at least a first transfer groove and a second transfer groove which move relatively to each other; and a plurality of rolling elements rollably inserted in the transfer path, each of the rolling elements being in a cylindrical, conical, or barrel shape or made up of a combination of curved faces, wherein: each of the rolling elements has a small diameter portion having a diameter smaller than the diameter of a remaining portion of the rolling elements, the transfer path has a contact point changing path at which the first transfer groove partially has an elastic decelerating plate along the transfer direction of the rolling elements, in which the small diameter portion of the rolling elements contacts the decelerating plate, the small diameter portion of each of the rolling elements comes in contact with the decelerating plate and the remaining portion of each of the rolling elements defines a first clearance with the first transfer groove in the contact point changing path, and a second clearance is defined between a central portion of the decelerating late and a bottom portion of a groove so that elasticity of the decelerating plate presses the rolling elements with a force, a frictional force acting between the decelerating plate of the first transfer groove and the small diameter portion of the rolling elements is greater than a frictional force acting between the second transfer groove and the rolling elements, and a radius from a rotation center of each of the rolling elements to a contact point between the decelerating plate and the small diameter portion of each of the rolling elements in the contact point changing path is smaller than a radius from the rotation center of each of the rolling elements to the contact point between the first transfer groove and each of the rolling elements in the remaining area of the transfer path.