Method and device for monitoring an access point leading into a safety zone of a roll winder or unwinder, and printing press

A method for monitoring an access point leading into a safety zone of a roll unwinder or winder, through which rolls can be transported in and/or out along a transport path;

• the access point being formed by an opening provided between two elements that mechanically delimit the safety zone, and the access point being monitored by a monitoring sensor system of a monitoring system;
• two scanners encompassed by the monitoring sensor system, with their respective measuring beams, in each case passing over an angular region situated in the same plane extending in the opening, characterized in that the access point is monitored in a pattern of protection fields including multiple protection fields having various sizes and/or shapes, that multiple of the protection fields having various sizes and/or shapes are in each case encompassed by a next-larger and/or next-wider protection field, entirely or at least viewed in the width and toward the top, that for multiple of these protection fields having various sizes and shapes, the scan images of the two scanners are checked for a breach of the relevant protection fields having various sizes and/or shapes in differing, adjoining or overlapping partial regions of the plane, and information about the permissibility of a determined protection field breach is derived by way of an evaluation of the breach patterns of breached protection fields obtained in the two partial regions.