ANORDNING FOR FOLJESTYRNING AV ETT VERKTYG I MOTSVARIGHET TILL EN PA FORHAND BESTEMD LINJE

摘要

A system for guiding a tool according to a predetermined direction includes a detector head which photoelectrically scans a line of the pattern with the line varying in width at predetermined locations and with the output signals of the scanning photoreceptors being conductable to a switching device having an adjustable switching threshold so that when the scanning is in the area of the altered line width an auxiliary signal is formed in addition to the control signal for the coordinate motors.