Spinning frame that contains builder cam

The utility model discloses a spinning frame that contains builder cam, the builder cam in the spinning frame is provided with the high protruding department of four evenly distributed on same periphery, and the both sides of high protruding department are indent cambered surface and tappred plane respectively, and the avris of indent cambered surface is called end trough with the avris coincidence and the coincidence department of the tappred plane of the adjacent protruding department of height. On the cross -section of perpendicular builder cam axis, the line in the line in end trough to the builder cam centre of a circle and high protruding department to the builder cam centre of a circle becomes 45 degrees angles including, on the concave arc face, and line length high protruding department is worth the biggest to the line length value of the line length insole trough in the builder cam centre of a circle is minimum. The speed that makes the ring rail move down like this is greater than the speed of rebo