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), each one of said cam surfaces (76, 78, 80) extending around a respective one of said cam bodies (70, 72, 74) and being engageable with said pipe element received within said central space, each one of said cam surfaces (76, 78, 80) comprising a region of increasing radius and a discontinuity of said cam surface (76, 78, 80), each one of said radii being measured about and from a respective one of said axes of rotation (32, 34, 36); characterized in that, at least one traction surface (94, 96, 98) extending around one of said cam bodies (70, 72, 74), said at least one traction surface (94, 96, 98) comprising a plurality of projections extending transversely to said axis of rotation (32, 34, 36) of said one cam body (70, 72, 74), said at least one traction surface (94, 96, 98) having a gap therein, said gap being aligned axially with said discontinuity of one said cam surface (76, 78, 80) surrounding said one 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 axis of rotation (32, 34, 36) of one of said gears (20, 22, 24), said at least one stop surface (71, 73) positioned adjacent to said discontinuity of said cam surface (76, 78, 80) on said one cam body (70, 72, 74); 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 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 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), each one of said cam surfaces (76, 78, 80) extending around a respective one of said cam bodies (70, 72, 74) and being engageable with said pipe element received within said central space, each one of said cam surfaces (76, 78, 80) comprising a region of increasing radius and a discontinuity of said cam surface (76, 78, 80), each one of said radii being measured about and from a respective one of said axes of rotation (32, 34, 36); characterized in that, at least one traction surface (94, 96, 98) extending around one of said cam bodies (70, 72, 74), said at least one traction surface (94, 96, 98) comprising a plurality of projections extending transversely to said axis of rotation (32, 34, 36) of said one cam body (70, 72, 74), said at least one traction surface (94, 96, 98) having a gap therein, said gap being aligned axially with said discontinuity of one said cam surface (76, 78, 80) surrounding said one 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 axis of rotation (32, 34, 36) of one of said gears (20, 22, 24), said at least one stop surface (71, 73) positioned adjacent to said discontinuity of said cam surface (76, 78, 80) on said one cam body (70, 72, 74); 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 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 stop surface (71, 73), thereby permitting continuous rotation of said cam bodies (70, 72, 74).