Pressure roller control means in item encoders

Claim 1

AN ENCODER FOR PRINTING ON DOCUMENTS OF DIFFERENT THICKNESSES HAVING A PRINTING COUPLE INCLUDING CHARACTER TYPES AND A PLATEN, A YOKE CARRYING SAID PLATEN AND PROVIDING BODILY LATERAL MOVEMENT OF THE PLATEN FROM ONE SIDE TO THE OTHER SIDE OF THE YOKE, MEANS FOR MOVING SAID YOKE TOGETHER WITH THE PLATEN TOWARD AND AWAY FROM SAID CHARACTER TYPES, TWO CALIPER MEMBERS OUTSIDE THE PRINTING AREA OF SAID CHARACTER TYPES, ONE OF SAID MEMBERS CARRIED BY SAID YOKE AND THE OTHER HAVING A FIXED POSITION WITH RESPECT TO SAID TYPES, SAID CALIPER MEMBERS ACTING TO LIMIT THE TRAVEL OF SAID YOKE TOWARD SAID TYPES WHEREBY A DOCUMENT INSERTED BETWEEN SAID CALIPER MEMBERS SPACES SAID YOKE AN ADDITIONAL AMOUNT FORM SAID CHARACTER TYPES EQUIVALENT TO THE THICKNESS OF SAID INSERTED DOCUMENT.