autopen

noun

au·to·pen ˈȯ-tō-ˌpen

plural autopens

: a device that mechanically reproduces a person's signature

Today autograph collecting is a growing avocation, enlivened by a renewed interest in musical manuscripts and scores and a fad for the rather rare letters of show-business figures. It is complicated by the autopen, which allows public figures to sign dozens of documents at one time …—

Jeffrey Simpson, Architectural Digest, December 1988

The machines sign letters at about the same pace as does the human hand. An autopen machine that automatically signs a stack of documents can spit out roughly 500 signatures an hour; those with manual document feeders, about 200 an hour.—

Nancy Benac, Associated Press, 27 June 2011

Everyone knows senators don't sign the vast majority of their letters; an autopen does that.—

Larry Pressler, New York Times, 23 Jan. 2000