Auto paper size sensing mechanism for an adjustable cassette

An automatic printing machine having a main body and including means for printing an image on a sheet, an adjustable sheet cassette, means for feeding a sheet from said cassette, said sheet cassette being movable in said machine from a sheet feeding position to a non sheet feeding position, said adjustable sheet cassette comprising a sheet stack support platform capable of supporting stacks of sheets of a plurality of length and width dimensions, at least one sheet edge guide movable in a path in said cassette to accommodate stacks of sheets of different length or width dimensions, said sheet edge guide having attached thereto an actuator arm having a plurality of switch actuators said machine having mounted thereto a circuit board having a plurality of switches, said switch actuators selectively actuating the switches on the circuit board on the main body of the machine when said cassette is in sheet feeding position in said machine, said actuators being located to selectively actuate the switches on the main body of the machine which represent one of a plurality of sheet sizes, each of said switches when actuated generating a unique resistance in the circuit on said circuit board, the resultant of said unique resistances determining a resultant voltage signal to a controller on the main body of the machine which allows the controller to interpret the length or width dimension of the sheets in the sheet cassette.