Signature machines

Claim 1

IN A SIGNATURE MACHINE OF THE KIND DESCRIBED WHEREIN A PREDETERMINED NUMBER OF SIGNATURES, GATHERED ONE ATOP ANOTHER IN A GROUP, ARE TO BE MOVED ALONG A CONVEYOR PATH TO A STITCHING STATION WHERE THE SIGNATURE GROUP IS TO BE JOINED INTO A BOOK, CALIPER APPARATUS FOR MEASURING EACH SUCH SIGNATURE GROUP PASSING THROUGH THE MACHINE TO DETERMINE IF THE THICKNESS THEREOF DEPARTS ON EITHER THE TOO THICK OR TOO THIN SIDE OF THAT PREDETERMINED AS CORRESPONDING TO A BOOK OF CORRECT THICKNESS AND COMPRISING: A PAIR OF ALIGNED ROLLERS BETWEEN WHICH A SIGNATURE GROUP IS TO BE MOVED PRIOR TO BEING JOINED; ONE OF SAID ROLLERS HAVING A FIXED AXIS OF ROTATION, MEANS YIELDABLY URGING THE OTHER OF SAID ROLLERS INTO A POSITION CLOSE TO SAID ONE ROLLER TO CONTACT OPPOSITE SIDES OF A SIGNATURE GROUP PASSING THEREBETWEEN DURING CALIPERING, WHEREBY SAID OTHER ROLLER WILL OCCUPY A POSITION SPACED FROM SAID ONE ROLLER DURING CALIPERING BY A DISTANCE DETERMINED BY THE THICKNESS OF THE SIGNATURE GROUP THUS CONTACTED; SAID MEANS INCLUDING AN OSCILLATABLE SHAFT, AN ARM SECURED THERETO AND WHICH SUPPORTS SAID OTHER ROLLER, ANOTHER ARM SECURED TO THE SHAFT FOR MOVEMENT THEREWITH TO DIFFERENT POSITIONS DEPENDING UPON THE THICKNESS OF THE SIGNATURE GROUP BEING CALIPERED, SPRING MEANS ACTING ON SAID OTHER ARM TENDING TO TURN SAID OSCILLATABLE SHAFT; A TIMING CAM ACTING ON A FOLLOWER CARRIED BY SAID OTHER ARM AND HAVING A DWELL WHEREAT SAID SPRING MEANS IS EFFECTIVE AND A HIGH PART WHEREAT SAID SPRING MEANS IS INEFFECTIVE TO TURN SAID OSCILLATABLE SHAFT; AND MEANS OPERATED BY SAID OTHER ARM IN ITS DIFFERENT POSITIONS TO CONTROL SUBSEQUENT OPERATIONS ON THE CALIPERED SIGNATURE GROUP.