A Study on Differential Cams which are used in Self-indicating Scales (2nd Report)

The Method to Detect the Load from the Displacement of Loading Point

Abstract

Ordinary scales with differential cams should be reconstructed if we want to get more accuracy in them, for there are too many pairs from the cam-pendulums to the rack which drives the pinion attached to the pointer. To omit those pairs, the authors tried to detect the load at the loading point. Namely they attached the end of the rack to this point directly to get the displacement of the load. In this paper, after some discussions on the motion analysis the authors offered a design procedure which is sure to provide a total accuracy of less than 1/1 000 (indication error/full scale) including the other errors. They checked experimentally the kinematic error and confirmed their theory.