18 each magazine 116 118 120 contains a vertically movable elevator 260 262 264 respectively the elevators 260 262 264 are substantially similar comprising a vertically disposed platform mount 270 and a generally horizontal platform 272 the platform mount 270 for each elevator 260 262 264 is mounted on a pair of vertically spaced mounting brackets 304 in turn slidably received on elevator track 305 the track 305 is fixed to base plate 34 in track receiving grooves 307 see fig1 the platforms 272 of the elevators 260 264 are substantially identical each having a generally u shaped relieved area 276 on its forward facing leading edge but the u shaped area on the leading edge of the platform of the center elevator 262 extends more deeply rearwardly into the platform 272 each platform 272 carries a belt clamp assembly 280 beneath and adjacent to its lower edge the belt clamp assembly 280 best seen in fig4 is clamped to elevator belts 282 as best seen in fig7 and 4 the belts 282 extend around idler pulleys 284 mounted on the main base plate 34 the belts 282 are coupled to drive pulleys 286 in turn and respectively connected to the elevator motors 48 50.