Patent ID: 7703396
Filing Date: 2010-04-27
Classification: G05D

Abstract:
1. A carriage system comprising: a comb tooth mark having teeth and grooves where each of the teeth has the same width as that of each of the grooves; a rectilinear section and a curve section having the comb tooth mark on both sides of a center line of a running route of a carriage wherein the teeth and the grooves being arranged at a constant pitch in the curve section so that the comb tooth mark being concentric with the center line of the running route; a sensor for detecting the comb tooth mark is provided on both sides of the carriage with respect to the center line of the running route; and means for detecting that the carriage is in the curve section, and means for, upon detecting that the carriage is in the curve section, correcting signals from said sensor based on a ratio of a radius of curvature of the center line of the running route to a radius of curvature of the comb tooth mark to determine a running distance in the curve section.