The evolution of a new machine is described, from an idea conceived in 1960 to a prototype operative in September 1964. The emphasis is on the decisions, methods, criteria, and results incorporated in the machine rather than on analytical aspects of the design. The primary criterion guiding the design was to provide a machine more economical for users to own.
A description is given of the machine, PC 64, which is a new completely hydraulic 42 in. x 4 in. capacity production paper cutter of the guillotine type, weighing less than 3000 lbs. Introduction of the essentials of a guillotine cutter and analysis of a 1960 commercial machine are used to establish reference limits for the new machine. Results of cutting tests performed to determine the most advantageous cutting angle are included.
Important new features of PC 64 include a single shear straightline motion knife drive powered by a single hydraulic cylinder, and a hydraulically driven and controlled backstop. Optional automatic control for the backstop is accomplished by means of notched program bars affording trimout cuts to .015 in. It is shown that for any cutting angle selected, the height, width, and length of PC 64 cannot be reduced further.
The machine is evaluated by comparison with commercial cutters marketed prior to and during the project. From the comparison it is concluded that features of PC 64 have commercial potential and that the primary criterion has been met.
Photographic materials on pages 11, 48, 49, 162, 163 and 181 are essential and will not reproduce clearly on Xerox copies. Photographic copies should be ordered.
