Wells Fargo & Co. said it is expanding its use of automated teller machines with imaging capabilities.

The San Francisco company, which already has 1,575 envelope-free ATMs in California, said Wednesday that it will install 277 more this year in the Los Angeles area, eliminating all of its traditional models, which require envelopes for deposits, in the region.

Wells has been using envelope-free ATMs since 2006. It has more than 6,900 machines in its ATM network.

The envelope-free machines let customers deposit multiple checks or bills simultaneously. Wells said the feature can save time and has proven popular with its customers.