Abstract: This safety device for binding machines, which prevents broken clamp locking mechanism springs from engaging and damaging roughing and trimming saw blades or the clamp carrier cam, provides a collar-like means to be securely mounted on the shaft which supports the lower end of the clamp spring. Anchored to the collar are two protruding pins which project on either side of the clamp spring to provide supports upon which the broken segement of spring may rest rather than dangling into the saw blades or coming into contact with the clamp carrier cam.