In the case of such devices as feed rollers, shielding is not possible. Hands, hair and clothing can be pulled into pinch points if caution is not exercised. Always replace guards and shields. Even seemingly smooth shafts can catch and wrap clothing. Any exposed, rotating machine component is a potential wrap point.
Injuries usually occur when loose clothing or long hair catch on and wrap around rotating shafts.
Protruding shaft ends can also become wrap points. Shafts may appear to be smooth, but small nicks, mud, or rust increase wrap potential. It is almost impossible to escape once wrapping of clothing begins, because of the power involved. The more you try to pull away, the tighter the wrap becomes. Hitches present typical crush points.