Gravure press with crowbar circuit

Details Gravure press with crowbar circuit Gravure press with crowbar circuit

1990-12-20

1993-09-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 55, H02H 320

Patent

active

052434877

ABSTRACT:
A gravure printing press with an electrostatic assist unit having a fault detection circuit and crowbar circuit in which the crowbar circuit has a transformer with a primary winding and a plurality of secondary windings. Each of the secondary windings has a field-effect transistor which is turned on in response to the detection of a fault condition whereby the voltage applied to the press is substantially reduced to zero and any electrostatic charge is substantially removed. A capacitor is coupled in parallel with the gate and source terminals of each field-effect transistor to lengthen the on-time of the transistors.

REFERENCES:
patent: 3295441 (1967-01-01), Garnier
patent: 3377369 (1969-11-01), Adamson et al.
patent: 3579036 (1971-05-01), McCoy
patent: 3619720 (1971-11-01), Coberley
patent: 3725739 (1973-04-01), Griffey
patent: 3766433 (1973-10-01), Nowell
patent: 4208965 (1980-06-01), Eichler et al.
patent: 4288830 (1981-09-01), Brasfield
patent: 4360850 (1982-11-01), Howard et al.
patent: 4656365 (1987-04-01), Billings
patent: 4991051 (1991-02-01), Hung
Engineering Drawing No. 400015-002 of Glassman, Dec. 1985.

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