Rotary hectographic duplicating machines

Claim 1

A ROTARY HECTOGRAPHIC DUPLICATING OR LIKE MACHINE WHICH COMPRISES A ROTATABLE PRINTING DRUM HAVING MEANS FOR SECURING AN IMAGE-CARRYING MASTER SHEET THEREAROUND WITH THE TEXT OR COPY LINES THEREOF EXTENDING PARALLEL TO THE AXIS OF SAID PRINTING DRUM, A COUNTERPRESSURE MEMBER FOR FORMING A PRINTING COUPLE IN CONJUNCTION WITH SAID PRINTING DRUM TO IMPRESS THE IMAGE OF SAID MASTER SHEET AGAINST THE COPY SHEET IN THE PRINTING BIGHT THEREOF, MEANS FOR CAUSING INTERMITTENT PRINTING PRESSURE BETWEEN SAID PRINTING DRUM AND SAID COUNTERPRESSURE MEMBER IN SYNOCHRONISM WITH THE PASSAGE THROUGH SAID PRINTING BIGHT OF SAID COPY SHEET AND SAID MASTER IMAGE TO EFFECT SELECTIVE LINE PRINTING, COPY SHEET CONVEYANCE MEANS DEFINING A TRAVEL PATH FOR SAID COPY SHEET UP TO SAID PRINTING BIGHT, FIRST COPY SHEET RESTRAINING MEANS AT A FIRST POSITION ALONG SAID COPY SHEET TRAVEL PATH, SAID FIRST COPY SHEET RESTRAINING MEANS BEARING AGAINST BOTH SIDES OF THE COPY SHEET MOVING THEREPAST SO AS TO EXERT A RETARDING DRAG THEREON AND BEING SEPARATED FROM SAID PRINTING BIGHT BY A PORTION OF SAID COPY SHEET TRAVEL PATH WHICH IS DEVOID OF ANY FURTHER CONTINUOUSLY EFFECTIVE COPY SHEET RESTRAINING MEANS, MOVABLE SUPPLEMENTARY COPY SHEET RESTRAINING MEANS LOCATED AT A SECOND POSITION ALONG SAID COPY SHEET TRAVEL PATH BETWEEN SAID FIRST POSITION AND SAID PRINTING BIGHT, SAID SUPPLEMENTARY COPY SHEET RESTRAINING MEANS BEING MOVABLE BETWEEN AN OPERATIVE POSITION IN WHICH IT IS EFFECTIVE TO IMPOSE RESTRAINT UPON MOVEMENT OF SAID COPY SHEET ALONG SAID PATH AND AN INOPERATIVE POSITION IN WHICH IT DOES NOT IMPEDE THE FREE TRAVEL OF SAID COPY SHEET ALONG SAID TRAVEL PATH, COPY SHEET SENSING MEANS LOCATED IN THE IMMEDIATE VICINITY OF SAID FIRST POSITION FOR DETECTING THE PRESENCE OR ABSENCE OF A COPY SHEET AT SAID FIRST POSITION, AND OPERATING MEANS FOR SAID MOVABLE SUPPLEMENTARY SHEET RESTRAINING MEANS RESPONSIVE TO SAID SHEET SENSING MEANS TO MOVE SAID SUPPLEMENTARY COPY SHEET RESTRAINING MEANS TO AN INOPERATIVE POSITION WHENEVER A COPY SHEET IS PRESENT AT SAID FIRST POSITION.