Means for indexing a rotary arm in small angular steps

Details Means for indexing a rotary arm in small angular steps Means for indexing a rotary arm in small angular steps

1986-02-18

1987-10-20

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 75, 360 97, G11B 554, G11B 2108

Patent

active

047018186

ABSTRACT:
This invention describes a means and method for moving an arm in precise angular increments to a degree of precision far beyond the capacity of a normal reduction gear assembly acting at the impetus of a stepper motor. At rest a set of paired and unequal high precision gear sets hold the member in place. To accomplish movement, they are decoupled and a normal reduction gear mechanism is employed to drive the member to the approximate location desired. The more precise location of the member is accomplished by the recoupling the high precision gear sets. Thus, without high precision movement a high precision location is attained.

REFERENCES:
patent: 4327384 (1982-04-01), Tomita et al.
patent: 4363046 (1982-12-01), Saito

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