End of rewind detector for a telephone answering device

Details End of rewind detector for a telephone answering device End of rewind detector for a telephone answering device

1985-07-08

1987-01-13

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242186, 360 742, 340679, G11B 1522, G11B 1532

Patent

active

046358684

ABSTRACT:
An end of rewind detector in a telephone answering device utilizes at least one tape cassette having a spindle. A rotating member which is made of a conductive plastic material containing carbon particles to exhibit intermittant conductivity characteristics rotates with the spindle. An electrical feeler is mounted for physical contact with the plastic material to detect variations in electrical conductivity, with termination of conductivity variation indicating termination of rotation of the spindle.

REFERENCES:
patent: 2807014 (1957-09-01), Rickert
patent: 3732477 (1973-05-01), Cicatelli
patent: 3759463 (1973-09-01), Yoshii
patent: 3845323 (1974-10-01), Bellasio
patent: 3909537 (1975-09-01), Jacobson
patent: 4035790 (1977-07-01), Farmer
patent: 4071736 (1978-01-01), Kamerling
patent: 4097726 (1978-06-01), Satoh et al.
patent: 4234139 (1980-11-01), Porchia
patent: 4494712 (1985-01-01), Godwin, Jr. et al.

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