Register compensating means for rotary members in web processing apparatus

Claim 1

REGISTER POINT INDEXING MEANS FOR ADJUSTING THE ROTATIONAL POSITION OF A ROTARY ELEMENT COMPRISING: A DRIVEN SHAFT ADAPTED TO BE OPERABLY CONNECTED TO THE ROTARY ELEMENT; A DRIVE SHAFT ADAPTED TO BE CONNECTED TO A POWER SOURCE; ROTATABLE BELT DRIVE MEANS ATTACHED TO THE DRIVE SHAFT; ROTATABLE BELT DRIVEN MEANS ATTACHED TO THE DRIVEN SHAFT, EACH OF SAID MEANS HAVING AN AXIS OF ROTATION, THE SAID AXES BEING PARALLEL; A SUBSTANTIALLY INELASTIC, ENDLESS BELT TRAINED OVER THE TWO MEANS TO FORM TWO BELT REACHES, EACH OF SAID REACHES BEING LONGER THAN THE RESPECTIVE LINE OF TANGENTS BETWEEN THE MEANS; AND A PAIR OF BELT FORCING MEANS FOR INVERSELY VARYING THE RELATIVE LENGTHS OF THE SAID REACHES TO ADJUSTABLY VARY THE ANGULAR RELATIONSHIP BETWEEN THE TWO SHAFTS, AND THEREBY BETWEEN THE DRIVE SHAFT AND THE ROTARY ELEMENT, A FIRST OF SAID BELT FORCING MEANS COMPRISING A SECOND MEMBER ENGAGING A SECOND ONE OF SAID REACHES, WHOSE POSITION RELATIVE TO THE LINES OF TANGENTS IS ADJUSTABLE IN ORDER TO VARY THE LENGTH OF SAID SECOND REACH, AND THE FIRST OF SAID BELT FORCING MEANS COMPRISING A FIRST MEMBER ENGAGING THE FIRST ONE OF SAID REACHES, WHOSE POSITION RELATIVE TO THE LINES OF TANGENTS IS YIELDINGLY ADJUSTABLE IN RESPONSE TO FORCES DERIVED FROM THE ADJUSTMENT OF THE FIRST BELT FORCING MEANS, THE FIRST MEMBER BEING FORCE-BIASED AGAINST SAID FIRST REACH, WHEREBY THE LENGTH OF THE SECOND REACH IS ADJUSTABLY DETERMINED BY THE SECOND MEMBER, AND THE FIRST REACH IS MAINTAINED IN TENSION BY THE FIRST MEMBER AT A PATH LENGTH DETERMINED BY THE SECOND MEMBER, THE ROTARY ELEMENT BEING ADAPTED TO BE DRIVEN BY THE DRIVE SHAFT THROUGH THE BELT DRIVE MEANS, THE BELT, THE BELT DRIVEN MEANS, AND THE DRIVEN SHAFT.