Turning – Severing or cut-off – Interrelated means for tool infeed and circumrotation
Patent
1975-04-18
1978-08-15
Bilinsky, Z. R.
Turning
Severing or cut-off
Interrelated means for tool infeed and circumrotation
90 20, B23B 332
Patent
active
041063759
ABSTRACT:
A high-production, precision machine tool has means for varying the feed rate of the tool during the actual machining of each workpiece. The means comprise a plurality of program cams disposed on the camshaft of the machine tool for selecting the appropriate feed rate at the desired time during the machining operation. The camshaft is rotated by a permanent magnet D.C. motor, and as the camshaft rotates, the program cams, in turn, trip a plurality of switches to gate one of several predetermined voltage signals representative of the desired motor speeds to a comparator which compares the gated signal with the output of a tachometer measuring the actual motor speed. The difference, a voltage signal representative of the correction to be made to the motor, is applied to a silicon controlled rectifier firing circuit which selectively fires an SCR network, generating a shaped pulse to provide a controlled voltage input to the motor, thereby selectively controlling its speed.
REFERENCES:
patent: 1389433 (1921-08-01), Brophy
patent: 3232143 (1966-02-01), Schurger et al
patent: 3548172 (1970-12-01), Centwer et al.
patent: 3720475 (1973-03-01), Leacock
patent: 3895559 (1975-07-01), Hoffman
Cook, Jr. Francis W.
Gurdak Felix J.
Bilinsky Z. R.
Litton Industrial Products Inc.
Spalla Joseph R.
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