Clutch and brake mechanism for franking machine employing electr

Details Clutch and brake mechanism for franking machine employing electr Clutch and brake mechanism for franking machine employing electr

1990-12-12

1992-06-23

Burr, Edgar S.

Printing

Rolling contact machines

Rotary

101 91, 400186, 192 215, B41F 1324

Patent

active

051233487

ABSTRACT:
A clutch and brake mechanism for a mechanical drive of print drum in a franking machine is disclosed which utilizes a clutch and brake operated by means of electric potentials applied across an electro-rheological fluid. Elements of the clutch and brake are formed with annular walls which are interposed to form opposed electrodes between which the electro-rheological fluid is contained. Application of electric potentials to the fluid is controlled by a microprocessor.

REFERENCES:
patent: 2948371 (1960-08-01), Lehde
patent: 3216542 (1965-11-01), Comstock
patent: 3869986 (1975-03-01), Hubbard
patent: 4638732 (1987-01-01), Salazar
patent: 4731728 (1988-03-01), Muller
patent: 4896754 (1990-01-01), Carlson
patent: 4926990 (1990-05-01), Schleuchardt
patent: 4936568 (1990-06-01), Nobile

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