for a predetermined period of time e g 10 minutes of operation without refilling a central controller 200 such as a cpu and or several programmable controllers controls the timed operation of the sheet feeder 14 and conveyors to deliver the standard size blanks 10 for cutting the blank 10 into the appropriate size for the carton needed to pack a particular pack size of books the controller 200 has stored therein the various carton sizes for various book packs the operator of the apparatus identifies the pack size for the books and the controller has stored in memory the size of carton to be cut from the standard size of blanks and the location of the sits to be made in the blank and location of the scores to be made in the blank prior to feeding the first blank into a cutting and scoring station 15 where the blank is cut to size and scored the cutting knives or knife wheels 25 are first positioned to define lateral sides for the trimmed blank herein the knife wheels 25 may be mounted on oppositely threaded portions of a shaft driven by a precisely positioned stepping motor or the like 205 the motor is operated by an electrical line 205 a connected to the.