Control mechanism for universal testing machines

Claim 1

IN A UNIVERSAL TESTING MACHINE HAVING A MOVABLE CROSS HEAD FOR LOADING A SPECIMEN TO BE TESTED AND MOTOR MEANS FOR MOVING THE MOVABLE CROSS HEAD, TOGETHER WITH A STRESS-STRAIN RECORDER HAVING A MOVABLE CHART AND CHART DRIVE MEANS FOR SUPPORTING AND MOVING THE CHART, APPARATUS FOR CONTROLLING THE RATES OF CHART AND CROSS HEAD MOVEMENTS: FIRST MEANS TO DEVELOP A PERIODIC SIGNAL FOR PREDETERMINED FREQUENCY; SECOND MEANS INCLUDING BINARY CODED DECIMAL DECADE COUNTERS CONNECTED TO RECEIVE SAID PERIODIC SIGNAL AND DEVELOP A PLURALITY OF PERIODIC OUTPUT SIGNALS EACH OF A FIXED AND DEFINITE FREQUENCY, AT LEAST SOME OF THE OUTPUT SIGNALS RESPECTIVELY HAVING FREQUENCIES LOWER THAN SAID PERIODIC SIGNAL, THE SECOND MEANS ALSO INCLUDING SELECTOR SWITCH MECHANISM FOR SELECING THE FREQUENCY OF THE SIGNAL APPEARING AT THE OUTPUT OF THE SECOND MEANS; A FIRST SYNCHRONOUS MOTOR HAVING A ROTOR CONNECTED TO SAID CHART DRIVE MEANS FOR OPERATING THE SAME, THE ROTOR BEING MADE OF MAGNETIC MATERIAL AND THE ROTOR BEING DRIVEN BY THE FIELD OF A PLURALITY OF STATOR COILS, MOTION OF THE ROTOR BEING EFFECTED BY ENERGIZING THE STATOR COILS IN SEQUENCE; A FIRST TRANSLATOR CONNECTED TO THE STATOR COILS OF SAID MOTOR, THE TRANSLATOR RECEIVING SAID OUTPUT SIGNALS AND DEVELOPING A CONTROL SIGNAL TO ENERGIZE THE STATOR COILS A IN SEQUENCE TO ROTATE THE ROTOR, THE FREQUENCY OF THE CONTROL SIGNAL APPLIED TO THE STATOR COILS DETERMINATING THE ROTATIONAL SPEED OF THE ROTOR; MEANS CONNECTING THE SELECTOR SWITCH MECHANISM WITH SAID TRANSLATOR TO TRANSFER SAID OUTPUT SIGNAL THERETO; THIRD MEANS INCLUDING BINARY CODED DECIMAL DECADE COUNTERS TO RECEIVE AT LEAST SOME OF SAID SIGNALS FROM SAID FIRST AND SECOND MEANS AND DEVELOP THIRD OUTPUT SIGNALS, AT LEAST SOME OF THE THIRD OUTPUT SIGNALS RESPECTIVELY HAVING FREQUENCIES LOWER THAN THE OUTPUT SIGNALS OF SAID SECOND MEANS, THE THIRD MEANS ALSO INCLUDING SELECTOR SWITCH MECHANISM FOR SELECTING THE FREQUENCY OF THE SIGNAL APPEARING AT THE OUTPUT OF THE THIRD MEANS; A SECOND SYNCHRONOUS MOTOR HAVING A ROTOR MADE OF MAGNETIC MATERIAL, THE ROTATOR BEING DRIVEN BY THE FIELD OF A PLURALITY OF STATOR COILS, MOTION OF THE ROTOR BEING EFFECTED BY ENERGIZING THE STATOR COILS IN SEQUENCE; A SECOND TRANSLATOR CONNECTED TO THE STATOR COILS OF SAID SECOND MOTOR, THE TRANSLATOR RECEIVING SAID THIRD OUTPUT SIGNAL AND DEVELOPING A CONTROL SIGNAL TO ENERGIZE THE COILS IN A SEQUENCE TO ROTATE THE ROTOR, THE FREQUENCY OF THE CONTROL SIGNAL APPLIED TO THE STATOR COILS DETERMINING THE ROTATIONAL SPEED OF THE ROTOR; MEANS CONNECTING THE SELECTOR SWITCH MECHANISM WITH SAID SECOND TRANSLATOR TO TRANSFER SAID THIRD OUTPUT SIGNALS THERETO; AND MECHANISM CONNECTED TO THE ROTOR OF SAID SECOND SYNCHRONOUS MOTOR AND TO SAID CROSS HEAD MOTOR FOR CONVERTING THE ROTARY MOTION OF THE ROTOR TO AN ELECTRICAL SIGNAL FOR DRIVING THE CROSS HEAD MOTOR.