Fixed guard -- Providing a barrier is a permanent part of the machine, preferable to all other types of guards.
Interlocked guard -- When this type of guard is opened or removed, the tripping mechanism and/or power automatically shuts off or disengages, and the machine cannot cycle or be started until the guard is back in place. An interlocked guard may use electrical, mechanical, hydraulic or pneumatic power or any combination of these. Interlocks should not “inching” by remote control, if required. Replacing the guard should not automatically restart the machine.
Adjustable guard -- Adjustable guard are useful because they allow flexibility in accommodating various sizes of stock, but, because they require adjusting, they are subject to human error.
Self-adjusting guard -- Provides a barrier which moves according to the size of stock entering the danger area.
Safeguarding by location/distance -- Locate the machine or its dangerous moving parts so that they are not accessible or do not present a hazard to a worker during normal operation. Maintain a safe distance from the danger area.
Two-hand control -- requires constant, concurrent pressure to achieve the machine. The operator’s hands are required to be at a safe location(on control buttons) and at safe distance from the danger area while the machine completes its closing cycle.
Restraint device -- Uses cables or straps attached to the operator’s hands and a fixed point. Must be adjusted to let the operator’s hands travel within a predetermined safe area. Hand-feeding tools are often necessary if the operation involves placing material into the danger area.