Connection device with no electrical contact
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United States of America Patent
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-
Aug 1, 1995
Grant Date -
N/A
app pub date -
Mar 18, 1993
filing date -
Mar 23, 1992
priority date (Note) -
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Abstract
A connection device without electrical contact for connecting a fixed part of a franking machine to a rotary print drum containing electronic circuits includes a transformer separable into two parts respectively fastened to the fixed part and to the rotary printing drum. A first modulator chops and modulates a DC current supplied to a first winding in sympathy with a first signal to be transmitted to the rotary drum. A rectifier and filter device supplies power to the electronic circuits in the rotary drum. A first demodulator demodulates the current induced in the second winding. A second modulator modulates the current induced in the second winding at a different frequency to that used by the first modulator and in sympathy with a second signal to be transmitted to the fixed part. A second demodulator extracts the second signal from the current in the first winding.
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