R 408.16541 Mill safety devices.

Rule 6541. (1) Except where an employee cannot come in contact with a roll nip point or be caught between a roll and an adjacent object because of a fixed installation, a mill shall be provided with 1 of the following safety trip devices to actuate braking equipment: (a) A pressure sensitive bar which can be tripped by not more than a 40-pound pressure of an employee's body. The bar shall be installed at the front and back of the mill across the length of the rolls of each mill roll having a height of 46 inches or more. (See figure 1) (b) A safety rod or safety cable installed at the front and back of a mill and located within 2 inches of a vertical plane tangent to the front and rear rolls. The safety rod or cable shall not be more than 72 inches from the floor of the operator's work level and operate with either a push or pull motion. (2) A mill having automatic overhead blending rolls shall have the blender interlocked to the mill so that actuation of the mill safety device will stop the blender. (3) A safety device, after actuation, shall require manual resetting. (4) A laboratory mill may be guarded by an interlocked barrier in lieu of the requirements of subrule (1). FIGURE 1 Installation of Pressure-Sensitive Body Bar This illustration shows relative position of a man to the pressure-sensitive body bar and the working roll. The body bar is positioned so that the man cannot reach the danger point on the face of the roll without tripping the safety switch. The danger point is determined as follows: W represents the thickness of a man’s fingers. X represents the maximum allowable stopping distance. Y and Z dimensions are such that the man cannot reach the danger point. A force equal to approximately 40 lbs (in the direction of the arrow) is required to actuate the safety switch. Editor's Note: An obvious error in R 408.16541 was corrected at the request of the promulgating agency, pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the error was published in Michigan Administrative Code, 1979. The memorandum requesting the correction was published in Michigan Register, 2016 MR 1.