The pink machine will be installed outside the chain's shop in Highland Village, 4014 Westheimer, probably in October, said the company's president, Charles Nelson. Once it arrives, it will be twice as fast as the existing 24-hour cupcake machines at Sprinkles stores in Beverly Hills, Calif., Chicago and Dallas, which take about a minute to complete a transaction. [...] the new machine will dispense up to six cupcakes in one transaction, whereas the original model is limited to a single treat per purchase.