Pressing device
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United States of America Patent
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-
Jun 5, 2001
Grant Date -
N/A
app pub date -
Feb 20, 1998
filing date -
Feb 21, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pressing device for joining workpieces has a pressing tool and a motorized drive for actuation of the pressing tool over a pressing distance, as well as a control device which has a drive control device for influencing the drive. The drive control device has a malfunction detection device which has an actual value sensor which is suitable for detecting, as the actual value, a physical magnitude which is correlated with the pressing resistance. At least one limit value profile for the actual value is retained in the malfunction detection device, and it has a comparison device which, during a pressing, checks whether the particular actual value lies on the permissible or impermissible side of the pertinent limit value profile. The malfunction detection device comprises a signal device and/or a shutdown device for the drive, which are/is activated if the actual value lies on the impermissible side of the pertinent limit value.
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