Book backbone, method and machine

Claim 1

A PROCESS FOR THE MANUFACTURE OF BOOK CASING WITH BACKBONES ROUNDED IN SITU, WHICH COMPRISES USE OF CASING BLANKS HAVING A FLAT BACKBONE MEMBER HINGEDLY JOINED TO FLANKING COVER MEMBERS, AND PLACING A SECOND BACKBONE MEMBER IN REGISTERED ASSEMBLY UPON THE FIRST BACKBONE MEMBER OF EACH CASING, PROVIDING BETWEEN SAID ASSEMBLED BACKBONE MEMBERS A LAYER OF THEROBONDING ADHESIVE AT LEAST COEXTENSIVE WITH THE EXTENT OF THE MEETING PLANE BETWEEN SAID MEMBERS, MOVING SAID CASING STEPBY-STEP ALONG A PREDETERMINED PATH INTO AND OUT OF A PREDETERMINED NUMBER OF STATIONS, AT THE FIRST OF WHICH IS A FLAT BACKING SURFACE UNDERLYING THE BACKBONE ASSEMBLY OF A CASING DISPOSED THREAT, THERE BEING A ROUNDING CAVITY DISPOSED TO UNDERLIE THE BACKBONE PORTIONS OF CASINGS DISPOSED AT SUCCEEDING STATIONS; APPLYING A BONDING HEAT AND PRESSURE TO A RESTRICTED AREA OF THE BACKBONE ASSEMBLY OF CASINGS DISPOSED ON THE FLAT BACKING SURFACE AT THE FIRST STATION, AND APPLYING SETTING HEAT AND ROUNDING PRESSURE TO THE MAJOR PORTIONS OF THE BACKBONE ASSEMBLY OF CASINGS AT SUCCEEDING STATIONS, THIS PRESSURE BEING DIRECTED AGAINST THE BACKBONE ASSEMBLY TO FORCE THE LATTER IN THE RESPECTIVE ROUNDING CAVITIES AT THE SEVERAL SUBSEQUENT STATIONS, HOLDING EACH CASING UNDER PRESSURE AND HEAT, AS AFORESAID, AT SAID SUBSEQUENT STATIONS FOR A PREDETERMINED SHORT TIME INTERVAL SUFFICIENT TO IMPART AT LEAST A PARTIAL SETTING TO SAID ADHESIVE AND ADVANCING SAID CASINGS IN CLOSE SUCCESSION INTO AND OUT OF A NUMBER OF SAID STATIONS SUCH THAT THE CUMULATIVE TIME DURATION OF EXPOSURE TO HEAT AND ROUNDING PRESSURE, AS AFORESAID, WILL BE SUFFICIENT TO SUBSTANTIALLY COMPLETE THE SETTING OF SAID ADHESIVE, WHEREBY TO FIXEDLY HOLD SAID BACKBONE ASSEMBLY IN A PREDETERMINED ROUNDED CONDITION.