Centerline conveyor for inkjet printing systems moves printheads and guide rails in and out with one crank adjustment handle, reducing changeover time between carton sizes. It handles carton widths from 10.5–25.5 in. and can be used with high-resolution inkjet, DOD valvejet, or continuous inkjet printers. Conveyor offers standard speed of 65 fpm, with other speeds available and option of variable speed. Overall conveyor length is 6 ft x 46 in. (cranked in) or 6 ft x 61 in. (cranked out) wide.