Variable ratio drive

Details Variable ratio drive Variable ratio drive

G - Physics

11

B

181/53, 352/21.2

G11B 15/28 (2006.01) G11B 15/18 (2006.01) G11B 15/26 (2006.01) G11B 15/46 (2006.01) G11B 19/28 (2006.01)

Patent

CA 1099016

Abstract of the Disclosure A variable ratio drive employs an elastic extens- ible control belt which changes its cross-section in relation to induced changes in its length, according to Poisson's ratio. The control belt is introduced between a pulley and a drive belt, and a mechanism employing a gear head control motor, or the like, acts to change the length of the control belt in a precise manner. This in turn changes the thickness of the control belt in a precise way, and the effective radius of the pulley/ control belt, acting on the drive belt, operates to change the ratio of the pulley and drive belt system. A specific embodiment is disclosed in a lightweight video tape recorder, used to change the drive ratio between a motor and a tape transport capstan, according to control signals.

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