Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1983-08-09
1985-02-19
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
227131, H01H 4732
Patent
active
045009368
ABSTRACT:
A fastener driving device such as a tacker, including a silicon-controlled rectifier (SCR) actuating circuit for producing a power stroke for substantially a complete half cycle of an AC potential supply and which occurs following the actuation of a switch actuable at random times with respect to the cycles of the AC supply. The circuit features three functional stages. A firing synchronizer circuit is provided to inhibit firing at other than the beginning or end of a half wave cycle of rectified AC potential. A memory supporting circuit provides a high degree of switch bounce immunity. A protecting circuit prevents an accidental and undesirable firing of the SCR that might otherwise automatically occur when a sudden increase of voltage occurs at its anode such as might occur when power is first applied to the actuating circuit.
REFERENCES:
patent: 3215864 (1965-11-01), Doyle
patent: 4417681 (1983-11-01), Bernecki et al.
G.E. Application Note Universal Motor Speed Controls--by F. W. Gutzwiller.
G.E. SCR Manual Fifth Edition 1972--pp. 202-203.
Eisenzopf Reinhard J.
Textron Inc.
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