Electronic postage meter having interlock between mechanical and

Details Electronic postage meter having interlock between mechanical and Electronic postage meter having interlock between mechanical and

1982-09-07

1986-02-25

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Comparing counts

377 30, 3408253, G06M 312, H03K 2140

Patent

active

045731748

ABSTRACT:
An electronic postage meter includes electronic circuitry for providing an accounting of the number of mailpieces imprinted with postage, and the amount of postage imprinted on such mailpieces. An electro-optic sensor connects with a mechanical drive of a printing drum of the meter to sense successive rotations of the printing drum, one rotation occurring for each imprinting of postage. A comparison circuit compares the one-bit signal provided by the electro-optic sensor with the least significant bit of a count of the mailpieces, which count is provided electronically by the accounting function. Any discrepancy between the least significant bit of the mechanical count and the least significant bit of the electronic count serves as a warning of a malfunction, or of tampering, of the postage unit. An error-signal circuit connected to the comparison circuit terminates operation of the meter upon the occurrence of a discrepancy between the mechanical and electrical counts.

REFERENCES:
patent: 3588459 (1971-06-01), Dilger
patent: 3978327 (1976-08-01), Huber
patent: 4012717 (1977-03-01), Censier et al.
patent: 4253015 (1981-02-01), McFiggans et al.
patent: 4287825 (1981-09-01), Eckert, Jr. et al.
patent: 4301507 (1981-11-01), Soderberg et al.

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