Cam Grooving Machine with Cam Stop Surfaces

A device for cold working a pipe element, said device comprising:

• a housing;
• a plurality of gears mounted within said housing, each one of said gears being rotatable about a respective one of a plurality of axes of rotation, said axes of rotation being parallel to one another, said gears being positioned about a central space for receiving said pipe element;
• a plurality of cam bodies, each said cam body mounted on a respective one of said gears;
• a plurality of cam surfaces, each one of said cam surfaces extending around a respective one of said cam bodies and being engageable with said pipe element received within said central space, each one of said cam surfaces comprising a region of increasing radius and a discontinuity of said cam surface, each one of said radii being measured about and from a respective one of said axes of rotation;
• a traction surface extending around one of said cam bodies, said traction surface comprising a plurality of projections extending outwardly from said one cam body, said traction surface having a gap therein, said gap being aligned axially with said discontinuity of said one cam surface surrounding said one cam body;
• a stop surface projecting from one of said cam bodies, said stop surface positioned adjacent to said discontinuity of said cam surface on said one cam body;
• an engagement body positioned within said central space adjacent said stop surface, said pipe element contacting said engagement body upon insertion of said pipe element into said central space;
• wherein
• said engagement body is movable relatively to said housing between a first position, wherein said engagement body engages said stop surface thereby preventing continuous rotation of said cam bodies, and a second position, wherein said engagement body is out of engagement with said stop surface, thereby permitting continuous rotation of said cam bodies.