Patent ID: 9638298
Date: 2017-05-02
CPC Classifications: B25J,F16H

Claim:
1. A feed error correction method for correcting error in feeding a moving body that moves reciprocatingly along a travel path, the error caused by extension of linear bodies during reciprocating motion of the moving body along the travel path, in a feeder in which a linear body for transmission of outbound power and a linear body for transmission of inbound power are connected to the moving body, the linear bodies being respectively held in reeling/unreeling fashion by a linear body manipulator, a guide unit for the linear bodies being movably arranged, the guide unit comprising a driven rotating wheel for engaging a medial portion of the linear body for transmission of outbound power and/or the linear body for transmission of inbound power, and the moving body performing reciprocating motion along the travel path through reeling and unreeling of both of the linear bodies during running of the linear body manipulator, wherein the method for correcting feed error in a feeder is characterized in that the driven rotating wheel of the guide unit, upon receiving power from a rotation system of the driven rotating wheel, being pulled in a direction of tensioning the linear bodies and caused to cause to tension the linear bodies, and once a load of a predetermined value or above bears upon the linear bodies, power from the rotation system to the driven rotating wheel is interrupted, so that the system for power transmission from the rotation system to the driven rotating wheel transmits power exclusively in a direction in which the linear bodies are pulled; with the feeder in the running state, when the linear bodies experience extension of a predetermined value or above, one-way power for towing the linear bodies is transmitted from the rotation system of the driven rotating wheel through a power transmission system, the linear bodies being towed upon receiving transmission of the one-way power, whereby extension equal to or greater than the constant value is cancelled so that feed error relating to the moving body does not arise; and in a case in which, with the feeder in the running state, when the linear bodies are not extending or are extending within a permissible range, or the linear bodies are tensioned, cancelling slack of the linear bodies caused by the extension, transmission of power for towing of the wire bodes from the driven rotating wheel through the power transmission system is interrupted.