Low inertia capstan

Details Low inertia capstan Low inertia capstan

1973-11-02

1976-01-06

Schacher, Richard A.

Advancing material of indeterminate length

By orbitally traveling material-engaging surface

Including details of roll or mount

226 95, 29132, B65H 1720

Patent

active

039306038

ABSTRACT:
A resiliently deformable low inertia capstan for driving magnetic tape in a digital tape transport is comprised substantially of plastic material having a low elastic modulus and provides substantial rigidity in a circumferential direction as well as accepting substantial deformation in other directions without damage. The capstan includes a rigid inner hub defining a concentric cylinder, a thin-walled cylindrical outer rim disposed concentrically about the inner hub, and a pair of thin-walled, somewhat conical side members interconnecting the hub and rim at opposite ends thereof. Circumferential grooves in the outer surface of the rim improve capstan aerodynamics and a thin coating of polyurethane on the lands of the rim improves the coefficient of friction. Holes through the outer rim reduce the inertia of the capstan, may be selectively spaced to indicate a desired rotational velocity when strobed at a selected frequency by a light source, and may be used in conjunction with negative or positive fixed pressure to respectively increase or decrease frictional engagement between a driven tape and the rim.

REFERENCES:
patent: 2000573 (1935-05-01), Spatta
patent: 3042281 (1962-07-01), Balvin
patent: 3537661 (1970-11-01), Isom
patent: 3554420 (1971-01-01), Agius
patent: 3622059 (1971-11-01), Savela
patent: 3645432 (1972-02-01), French
patent: 3659797 (1972-05-01), Coy
patent: 3695728 (1972-10-01), Haussels
patent: 3695729 (1972-10-01), Schwerdhoter

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