Patent ID: 6919554

Claim:
A method of securing a hazardous zone on a bending press having a vertically downwardly moving upper tool with a point of attack, wherein the hazardous zone is predetermined by an extent of the point of attack of the tool and by a slowing down path of the tool along a direction of movement, wherein an optoelectronic sensor is moved with the tool and monitors the hazardous zone and wherein, when an intervention into the hazardous zone is detected, a switching off process is triggered for an immediate stopping of the tool movement, wherein a monitored zone with a boundary surface is monitored which has a cross-section in a plane parallel to the tool movement and perpendicular to the direction of extent of the point of attack of the tool that is at least in part defined by an arc of a circle or that extends in a radial direction beyond an arc of the circle, wherein a center of the arc of the circle is arranged spaced apart from the point of attack of the tool in the direction of movement of the tool, wherein the arc of the circle has a monitored radius which is at least so large that at least a part of the boundary surface of the monitored zone extends up to the point of attack of the tool or radially beyond the point of attack of the tool, and wherein the boundary surface of the monitored zone is convexly curved with respect to the point of attack of the tool.