Cutting – Processes
Patent
1975-03-10
1976-09-14
Abercrombie, Willie G.
Cutting
Processes
83 61, 83 62, 83 63, B26D 528
Patent
active
039799808
ABSTRACT:
An apparatus and process for protecting a press die and press frame from damage when stock has jammed therein. The apparatus includes a proximity sensor which senses metal entering the press, a proximity sensor to detect the stamped product, and a proximity sensor to detect the skeleton scrap metal left after the stamping. A press cycle detection sensor senses a cycle of the press and generates a timing pulse. Means for comparing signals generated by the proximity sensors is regulated by the timing pulse and includes a signal converter, a memory circuit, a signal comparator and a fault check operatively connected to one another. An output relay breaks the press circuit upon an appropriate signal.
The process of protecting a press die includes sensing the input to determine if stock is present, generating an electrical impulse and storing the signal in a memory. The presence of the stamped product and the resultant scrap are noted and similar signals generated. The output signals are also fed to memories. The movement of the press ram is monitored by means of sensor detecting rotation of the main press crankshaft. This sensor generates a timing signal and a fault check signal. If the stock is not present at one location during a predetermined time period, a fault check system signals the press to stop since it is an indication that stock is presumably jammed or backed up. After a fault check signal is generated and no fault signal is present, all input memories are reset and a new cycle is started.
REFERENCES:
patent: 3023283 (1962-02-01), Wintriss
Balciunas Eugene T.
Biester Robert E.
Abercrombie Willie G.
The Sherwin-Williams Company
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