Abstract: A safety device for mechanically-operated apparatus, such as a flywheel-driven punch press, consists of a hook-providing coupling member for mounting on the press crank shaft, and a cooperating coupling member for connection to the apparatus body via a power-absorbing member. The coupling members rest in the coupled position and are moved momentarily to the uncoupled position upon initiation of an operation by the operator. If therefore the movable member of the press continues to move after the normal termination of the cycle the coupled members connect the movable member to the power-absorbing member so that the movable member is brought to a stop before the press die parts can close. A third coupling member is provided for engagement with the second coupling member to brake the movement of the operating member if it should move in the opposite direction.