Franking machine

Details Franking machine Franking machine

1989-05-22

1990-06-12

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

With developing

G03B 2732, G03B 2752

Patent

active

049337068

ABSTRACT:
A franking machine is disclosed in which printing of a franking impression is effected by exposing a layer of micro-capsules containing ink to light to thereby cause hardening of the exposed micro-capsules and then subjecting the layer to pressure to rupture the un-exposed micro-capsules in the presence of a developer with which the ink reacts to become visible. The layer of micro-capsules may be coated on envelopes or label tape during manufacture or by coating means in the franking machine. The developer may be applied as a coating in a similar manner. Alternatively one or both the micro-capsules and the developer may be carried on a transfer film brought into contact under pressure with a mail item after exposure of the film.

REFERENCES:
patent: 3695755 (1972-10-01), Egnaczak
patent: 4039258 (1977-08-01), Hujer
patent: 4073588 (1978-02-01), Zangenfeind et al.
patent: 4455100 (1984-06-01), Bauer
patent: 4720733 (1988-01-01), Ohtake et al.
patent: 4840696 (1989-06-01), Krasuski et al.
patent: 4886566 (1989-12-01), Peyre

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