Advancing material of indeterminate length – Plural material-moving means
Patent
1983-11-14
1985-03-19
Christian, Leonard D.
Advancing material of indeterminate length
Plural material-moving means
226188, 242206, 360 962, B65H 1742
Patent
active
045054134
ABSTRACT:
This invention relates to an improvement in a dual capstan drive unit for a reversible tape recorder. A dual capstan drive unit has means to generate variable frequency signals varying in their frequencies corresponding to the revolution speed of first and second capstans which serve to transport a magnetic tape. A single clock oscillator feeds two frequency dividers to produce first and second slightly different reference frequency signals to produce a slight difference between the peripheral speeds of upstream and downstream capstans to maintain tape tension for both tape directions. Control means to controls the revolution of the first and second capstans and compares the detected frequency signals with the respective reference frequency signals so that the revolution of the first and second capstans have a predetermined value. In this invention, the first and second capstans have an outer diameter different from each other and the generated frequency signals have equal frequencies when the peripheral speeds of the two capstans are equal.
REFERENCES:
patent: 3419202 (1968-12-01), Maxey
patent: 3861573 (1975-01-01), Kawasaki et al.
patent: 4153918 (1979-05-01), Jenkins
patent: 4355750 (1982-10-01), Saitou
patent: 4431950 (1984-02-01), Bingaman
Christian Leonard D.
Nakamichi Corporation
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