Abstract: At 5:30 p.m. on February 6, 2020, an employee was removing machine-stacked envelopes in bunches of 500 from a RO3 F.L. Smith Rollamatic Folding Machine to place them on a table for packing. One envelope remained stuck in the seal flap folder area of the machine, close to the delivery end of the line. The employee raised the bracket tines over the seal flap folder with the lift handle. Sensors malfunctioned and did not shut the machine down as expected by the employee when he lifted tines and reached into the machine. The employee's right index finger was caught in the ingoing nip point between two rollers. The employee suffered an amputation of his right index finger to the second knuckle and was treated without hospitalization.