US 4,301,696 A · Method and an arrangement for the compensation of inertia forces in the indexing movement of a machine element

Abstract

When machine elements having a large mass are indexed, i.e. subjected to short, quick rotating movements, very great acceleration and deceleration forces must be transmitted via the driving means of the machine. Due to vibrations occurring, increasing the stresses on the driving means, the driving means must be dimensioned accordingly. The present invention provides a method and an arrangement for the compensation of the forces applied and thus for reducing the stresses which occur. This is performed by combining the indexing machine element with a cam disc which is contacted by a number of spring-loaded cam followers, whereby the cam disc has such a shape that the cam follower decelerates and accelerates the cam disc following the desired movement pattern of the machine element.

Claims9

Dependent claims

An apparatus for compensating inertia forces comprising:

a rotary element;
means for drivingly indexing said element between a plurality of discrete angular stop positions;
a cam, said cam having a cam surface contoured with a plurality of peaks corresponding to said discrete angular positions;
means for mounting said cam for rotation with said element;
a first cam follower in engagement with said cam surface, said cam surface and said cam follower cooperating to initially assist rotation of said element and to subsequently resist rotation of said element between consecutive ones of said discrete angular positions;
and
means for urging the first cam follower against one of the peaks of the cam surface when the element is at each of the discrete angular positions and imposing substantially zero torque on said element at each of the discrete angular positions.

4 more elements

Dependencies are inferred from the claim text.

Method and an arrangement for the compensation of inertia forces in the indexing movement of a machine element

Life of this patent

Method and an arrangement for the compensation of inertia forces in the indexing movement of a machine element

Life of this patent

Abstract

Claims9