Electrostatic recorder with drive system including feedback means

Claim 1

AN ELECTROSTATIC RECORDER COMPRISING A CONTAINER FOR AN ELECTROSTATICALLY CHARGEABLE RECORDING MATERIAL, SAID CONTAINER HAVING A LONGITUDINAL SLIT THEREIN, A RECORDING MEDIUM, A WEB MEMBER DISPOSED BETWEEN SAID SLIT AND SAID RECORDING MEDIUM AND ARRANGED TO COVER SAID SLIT, SAID WEB MEMBER HAVING A HOLE THEREIN ALIGNED WITH SAID SLIT, ELECTROSTATIC CHARGING MEANS CONNECTED TO SAID CONTAINER AND SAID RECORDING MEDIUM AND OPERATIVE TO CHARGE SAID CONTAINER AND SAID RECORDING MEDIUM TO OPPOSITE POLARITIES FOR ATTRACTING SAID RECORDING MATERIAL TO SAID RECORDING MEDIUM THROUGH SAID HOLE, MOTOR MEANS ARRANGED TO PROVIDE A BIDIRECTIONAL MOVEMENT OF SAID WEB TO EFFECT A MOTION OF SAID HOLE ACROSS SAID RECORDING MEDIUM, A PRERECORDED SUCCESSION OF INFORMATION SIGNALS ON A PORTION OF SAID WEB MEMBER, SIGNAL RESPONSIVE MEANS ARRANGED TO READ SAID INFORMATION SIGNALS TO PROVIDE VARYING MAGNITUDE OUTPUT SIGNALS REPRESENTATIVE OF THE POSITION OF SAID HOLE WITH RESPECT TO SAID RECORDING MEDIUM, INPUT SIGNAL MEANS ARRANGED TO BE CONNECTED TO A SOURCE OF AN INPUT SIGNAL TO BE RECORDED, SIGNAL COMPARATOR MEANS CONNECTED TO SAID INPUT SIGNAL MEANS AND SAID OUTPUT SIGNALS FROM SAID RESPONSIVE MEANS AND OPERATIVE TO PROVIDE AN ERROR SIGNAL SUITABLE FOR DRIVING SAID MOTOR MEANS TO EFFECT A SUBSTANTIAL EQUALITY BETWEEN SAID OUTPUT SIGNAL FROM SAID RESPONSE MEANS AND AN INPUT SIGNAL FROM SAID INPUT SIGNAL MEANS.