A device for cold working a pipe element, said device comprising: a housing; a plurality of gears (20, 22, 24) mounted within said housing, each one of said gears (20, 22, 24) being rotatable about a respective one of a plurality of axes of rotation (32, 34, 36), said axes of rotation (32, 34, 36) being parallel to one another, said gears (20, 22, 24) being positioned about a central space for receiving said pipe element; a plurality of cam bodies (70, 72, 74), each said cam body (70, 72, 74) mounted on a respective one of said gears (20, 22, 24); a plurality of cam surfaces (76, 78, 80) extending around each said cam body (70, 72, 74), each said cam surface (76, 78, 80) being engageable with said pipe element received within said central space and comprising a region of increasing radius, said radii being measured about and from one of said axes of rotation (32, 34, 36), all of said cam surfaces (76, 78, 80) on each said cam body (70, 72, 74) being circumferentially aligned with one another; a respective discontinuity of said cam surfaces (76, 78, 80) being positioned between each of said cam surfaces (76, 78, 80) on each said cam body (70, 72, 74); characterized in that, at least one stop surface (71, 73) projecting from one of said cam bodies (70, 72, 74) transversely to said axes of rotation (32, 34, 36) of said one cam body (70, 72, 74), said at least one stop surface (71, 73) being positioned adjacent to a discontinuity of said one cam surface (76, 78, 80); a pinion mounted within said central space within said housing, said pinion meshing with said plurality of gears (20, 22, 24) and being rotatable about a pinion axis oriented parallel to said axes of rotation (32, 34, 36); a cup adjacent said pinion, said cup receiving said pipe element upon insertion of said pipe element into said central space; wherein said cup is movable relatively to said housing along said pinion axis between a first position, wherein said cup engages said at least one stop surface (71, 73) thereby preventing continuous rotation of said cam bodies (70, 72, 74), and a second position, wherein said cup is out of engagement with said at least one stop surface (71, 73), thereby permitting continuous rotation of said cam bodies (70, 72, 74). a housing; a plurality of gears (20, 22, 24) mounted within said housing, each one of said gears (20, 22, 24) being rotatable about a respective one of a plurality of axes of rotation (32, 34, 36), said axes of rotation (32, 34, 36) being parallel to one another, said gears (20, 22, 24) being positioned about a central space for receiving said pipe element; a plurality of cam bodies (70, 72, 74), each said cam body (70, 72, 74) mounted on a respective one of said gears (20, 22, 24); a plurality of cam surfaces (76, 78, 80) extending around each said cam body (70, 72, 74), each said cam surface (76, 78, 80) being engageable with said pipe element received within said central space and comprising a region of increasing radius, said radii being measured about and from one of said axes of rotation (32, 34, 36), all of said cam surfaces (76, 78, 80) on each said cam body (70, 72, 74) being circumferentially aligned with one another; a respective discontinuity of said cam surfaces (76, 78, 80) being positioned between each of said cam surfaces (76, 78, 80) on each said cam body (70, 72, 74); at least one stop surface (71, 73) projecting from one of said cam bodies (70, 72, 74) transversely to said axes of rotation (32, 34, 36) of said one cam body (70, 72, 74), said at least one stop surface (71, 73) being positioned adjacent to a discontinuity of said one cam surface (76, 78, 80); a pinion mounted within said central space within said housing, said pinion meshing with said plurality of gears (20, 22, 24) and being rotatable about a pinion axis oriented parallel to said axes of rotation (32, 34, 36); a cup adjacent said pinion, said cup receiving said pipe element upon insertion of said pipe element into said central space; wherein said cup is movable relatively to said housing along said pinion axis between a first position, wherein said cup engages said at least one stop surface (71, 73) thereby preventing continuous rotation of said cam bodies (70, 72, 74), and a second position, wherein said cup is out of engagement with said at least one stop surface (71, 73), thereby permitting continuous rotation of said cam bodies (70, 72, 74).