Patent ID: 6240626
Filing Date: 2001-06-05
Classification: B21D,B25B,Y10T

Abstract:
A pressing device (1) for joining workpieces (44, 45), having a pressing tool (3) and a motorized drive for actuation of the pressing tool (3) over a pressing distance, and having a control device (26) which has a drive control device (62) for influencing the drive (5), characterized by the following features:the drive control device (62) has a malfunction detection device;the malfunction detection device has an actual value sensor (23, 24, 25);the actual value sensor (23, 24, 25) is suitable for detecting, as the actual value, a physical magnitude which is correlated with the pressing distance;at least one limit value profile (83, 84) for the actual value is retained in the malfunction detection device;the malfunction detection device has a comparison device which, periodically during the pressing operation, checks whether the particular actual value lies on the permissible or impermissible side of the pertinent limit value profile (83, 84); andthe malfunction detection device comprises a signal device (78) and/or a shut down device (66) for the drive (5), which are/is activated at any time during the pressing operation from the commencement of the pressing operation until the final pressed position is achieved if the actual value lies on the impermissible side of the pertinent limit value.