US Patent No. 1,335,218, granted 30 March 1920 to Daniel Blydenburgh of South Attleboro, Massachusetts, for an attachment that automatically stops a lace weaving machine when a catch bar flies out of engagement with the bobbin carriages (a "smash"). The mechanism uses bell crank levers, vertically sliding pins, an oscillatory shaft and links connected to the machine's shift rod, and it prevents restarting until the catch bars are back in place. A modified form mounts on the existing rail bracket bolt without altering the machine. The patent has two sheets of drawings (Figs. 1-6), a specification and six claims.