Shufflemaster is the premier manufacturer of automatic card shuffling machines in the United States.
Shufflemaster shuffling machines for poekr tables are built directly into the surface of the table, usually near the center of the table surface. When cards need to be shuffled, the dealer presses a button on the machine and a door flips up, revealing a rising tray which contains a shuffled deck, ready for dealing. The dealer places the to-be-shuffled deck into the machine, removes the already-shuffled deck, and the Shufflemaster machine then lowers its tray, closes its door, and begins shuffling the deck beneath the table surface.
It takes approximately 60 seconds for a Shufflemaster poker-shuffling machine to fully shuffle a deck. While it is being shuffled, the dealer cannot push any button to cause the machine to stop; if the dealer needs to get a freshly-shuffled deck faster than 60 seconds (for instance, if a shorthanded hand is folded to the blinds, who choose to chop), the dealer must instead simply reshuffle their current deck by hand (or wait until the Shufflemaster is done, but that is often frowned upon by management).
Shufflemaster is also the company that invented the casino game Let It Ride, a poker-themed house-banked gambling game. Let It Ride is copyrighted by Shufflemaster, and casinos wishing to spread it must pay royalties to Shufflemaster, and must use Shufflemaster shuffling machines at their Let It Ride tables.