Patent ID: 7286895
Filing Date: 2007-10-23
Classification: B21D,B30B,F16P,Y10T

Abstract:
1. A safety device for a machine having a first machine part and a second machine part, in which the first machine part carries out a working movement towards the second machine part, wherein the first machine part has a leading edge in the direction of movement, the safety device comprising: at least a first and a second optical barrier adapted to move along with the first machine part during the working movement, wherein the first optical barrier is adapted to run ahead of the leading edge by a first distance, and the second optical barrier being arranged at a second distance from the first optical barrier, a control unit, which is configured to stop the working movement of the first machine part if the first optical barrier is interrupted, a test unit for testing whether the second optical barrier has been interrupted once the first machine part has come to a standstill, and a blocking unit for blocking the working movement of the first machine part as a function of a test result from the test unit.