The CRX is a center and timing unit that is intended to function in front of modified RS or RQ Top and Bottom Semi-Automatic Random Carton Sealers. Combining the CRX and the modified RS or RQ Sealer, these two units will then function as a fully automatic random carton sealing system. The CRX automatically centers and times a carton into the modified Semi-Automatic Random Sealer thereby allowing the sealer to function as a Fully Automatic Carton Sealer. This application requires the top flaps to have been already closed and tabbed closed by either a label or a small piece of tape before being completely sealed top and bottom by the random sealer. The two units cost much less than a standard fully automatic random sealer and has a smaller footprint where space may be an issue.