System for detecting irregularities in typing technique

Claim 1

IN COMBINATION IN A TYPEWRITER HAVING A BASE, A PLATEN MOUNTED ON SAID BASE WITH A CENTRAL, HORIZONTALLY DISPOSED AXIS EXTENDING TRANSVERSELY THEREOF, SAID PLATEN HAVING A PERIPHERAL SURFACE EXTENDING AROUND SAID AXIS, A SET OF TYPE COOPERATING WITH SAID PERIPHERAL SURFACE OF THE PLATEN, SAID PLATEN AND SAID TYPE BEING MOUNTED ON SAID BASE FOR RELATIVE MOVEMENT IN THE DIRECTION OF THE AXIS OF THE PLATEN FROM AN INITIAL STARTING POSITION AT THE LEFT OF SAID BASE TO A FINAL STOPPING POSITION OF THE RIGHT OF SAID BASE, A SET OF KEYS ON SAID BASE LOCATED IN FRONT OF SAID PLATEN OPERATIVELY CONNECTED TO THE SET OF TYPE FOR ACTUATING THE TYPE AND PRODUCING SAID RELATIVE AXIAL MOVEMENT OF SAID PLATEN SURFACE AND SAID SET OF KEYS TOWARD THE FINAL STOPPING POSITION AT THE RIGHT OF SAID BASE, MEANS FOR SUPPORTING A SHEET OF PAPER IN ASSOCIATION WITH THE PLATEN SURFACE IN A POSITION FIXED AXIALLY THEREOF BUT FREE TO ADVANCE FORWARDLY AND UPWARDLY THEREOVER AT A RIGHT ANGLE TO THE AXIS OF THE PLATEN AND SO AS TO BE ENGAGED BY THE TYPE WHEN ACTUATED BY THE KEYS, SAID PLATEN AND KEYS BEING MOUNTED ON SAID BASE FOR RELATIVE RETURN MOVEMENT FROM SAID FINAL STOPPING POSITION AT THE RIGHT OF SAID BASE TO SAID INITIAL STARTING POSITION AT THE LEFT OF SAID BASE; SHEET-ADVANCING MEANS INDEPENDENT OF THE ACTUATION OF THE KEYS AND SAID RETURN MOVEMENT FOR MOVING THE SHEET CONTINUOUSLY AT A CONSTANT PREDETERMINED RATE UPWARDLY OVER THE PLATEN SURFACE IN ENGAGEMENT THEREWITH AND AT SAID RIGHT ANGLE RELATIVE TO THE AXIS OF THE PLATEN SO THAT AS THE KEYS ARE ACTUATED DURING SUCH ADVANCING AND AXIAL MOVEMENT AND AS THE PLATEN AND KEYS, ARE RETURNED TO THEIR INITIAL RELATIVE STARTING POSITION, A COMBINATION RELATIVE MOVEMENT OF THE SHEET AND TYPE IS PRODUCED BOTH HORIZONTALLY IN THE DIRECTION OF SAID PLATEN AXIS AND UPWARDLY AT A RIGHT ANGLE THERETO, THEREBY RESULTING IN THE TYPING OF A VARIABLE ANGULAR LINE ON THE SHEET WHICH SLANTS AT AN INCLINED ANGLE FROM LEFT TO RIGHT AND WHICH HAS CHARACTERISTICS DEPENDENT ON THE SKILL OF THE TYPIST ACTUATING THE TYPEWRITER BY SAID KEYS AND CONTROLLING SAID RETURNS MOVEMENT TO SAID INITIAL STARTING POSITION.