shown in that figure rails 156 and 158 are configured with a u shape to hold the wheels 160 of the platen 104 rail 156 changes elevation while rail 158 turns to enable the platen to rotate at an angle to the horizontal position of the platen in this position the part 138 is urged by gravity toward the edge of the platen closest to rail 156 alternatively as shown in fig7 both rails can change elevation in opposite directions to turn the platen over and drop the object with continued reference to fig5 as the platen travels through the discharge area 150 the track enables the platen 104 to rotate and the controller 120 operates the inductive heaters 124 to heat the platen and raise its temperature to a level that enables the part 138 to be released from the platen the sensor 122 which is positioned at the edge from which the part falls away generates a signal that enables the departure of the part 138 from the platen 104 to be detected the platen 104 continues to move along the track 110 past the wiper 130 that extends across the path of the track 110 as the platen passes the wiper 130 the wiper removes residual material from the platen surface a receptacle can be positioned beneath the wiper 130 to receive the falling debris cleared from the platen 104 by the wiper 130 the.