MAGNETIC CONTROL STRIP RECORDING DEVICE FOR ROADWAY CONTROL SYSTEM

摘要

ABSTRACTA magnetic control strip recording device for vehiclecontrol systems. A paving machine (12) lays a strip (10)containing magnetizable material. A wheel (30) rotates inresponse to the movement of machine (12). Magnets (34),(36) on the wheel and reed switches (38), (40) adjacentthe wheel are activated in response to the movement of thewheel. An electromagnet (21) is energized when the reedswitches (38), (40) are closed creating a magnetic patternin the strip (10) of magnetized zones having alternatingpolarities for adjacent zones. An alternative magneticpattern may also be produced by opening the optional dis-abling switch (44). The switches (38, 40) are preferablycapacitively coupled to the electromagnet (21) to preventundue drain on the power supply should the wheel (30) bestopped with one of the switches (38, 40) closed.