The present invention features a receipt printing and check validating machine. The machine is characterized by a drop-in loading for the receipt paper supply roll. A first drive roller for the receipt printer is pivotably mounted in a clamshell bucket. The first drive roller is swung into contact, when the clamshell bucket is closed, with an idler roller centrally mounted on a fixedly-mounted idler/drive combination shaft. The check validating drive features a second, slip drive roller pair that is in pivotable contact with a pair of slip drive rollers mounted on the aforementioned fixedly-mounted idler/drive combination shaft, one on either side of the receipt idler roller. Thus, the idler/drive combination roller shaft has a fixed position with respect to both drive rollers, and is used cooperatively by both drive rollers. Both the check and the receipt can emerge from the same slot in the housing of the machine.