a transfer device combines an advance - return drive mechanism and a clamp - unclamp drive mechanism . the transfer device operates from only one side of a press to position both drive mechanisms above a pair of feed bars thereby greatly reducing spatial constraints and costs and enabling an increase in speed . the feed bars operate to process a work piece along a process direction . the feed bars are cantilevered from the transfer device for easy use with a press , raw materials feeder , and product gatherer .