Section R. 408.12737 - Jointers; guardsRule 2737.
(1) A hand fed jointer with a horizontal or vertical cutting head shall have an automatic guard covering all the sections of the cutting head on the working side of the fence or gauge. The guard shall effectively keep the operator's hand from coming in contact with the revolving knives. The guard shall adjust itself automatically to cover the unused portion of the head, and shall remain in contact with the material at all times.(2) A hand fed jointer with a horizontal cutting head shall have a guard covering the section of the head back of the gauge or fence.(3) Each wood jointer with vertical head shall have either an exhaust hood or other guard so arranged as to enclose completely the revolving head, except for a slot of such width as may be necessary and convenient for the application of the material to be jointed.Mich. Admin. Code R. 408.12737