Shaft angle adjustment of a synchronized tandem-press production

Details Shaft angle adjustment of a synchronized tandem-press production Shaft angle adjustment of a synchronized tandem-press production

1974-09-20

1976-11-09

Schaefer, Robert K.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Synchronizing or phasing control

318 74, H02P 546

Patent

active

039913503

ABSTRACT:
An improved technique is disclosed for adjusting the crankshaft angle of each of a plurality of synchronized tandem-coupled presses with respect to a reference shaft angle. At the start of adjustment, a plurality of first motors that synchronously drive the successive crankshafts during normal press operation are disengaged from the crankshafts and maintained operative with undiminished speed. A plurality of second motors operative at a speed slightly greater than the speed of the reference shaft are thereafter enabled when the angular phase of each crankshaft relative to that of the reference shaft is within a prescribed angular range. Such range is established by means of a synchro-driven control system coupled to the reference shaft and to the crankshaft when the first motor is disengaged from the crankshaft. Once the required angular adjustment is completed, the rotating first motor may be reengaged to the crankshaft to restore normal press operation.

REFERENCES:
patent: 2929974 (1960-03-01), Wells
patent: 3024395 (1962-03-01), Pedersen et al.
patent: 3030564 (1962-04-01), Early et al.
patent: 3199439 (1965-08-01), Danly
patent: 3549948 (1970-12-01), Jaeschke
patent: 3557686 (1971-01-01), Sapolsky
patent: 3621348 (1971-11-01), Uchida et al.
patent: 3659166 (1972-04-01), Fredell
patent: 3675098 (1972-07-01), Heiberger
patent: 3728597 (1973-04-01), Cummens et al.
patent: 3746957 (1973-07-01), Foster et al.

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