Direct keyboard controlled rack shift device for a single elemen

Details Direct keyboard controlled rack shift device for a single elemen Direct keyboard controlled rack shift device for a single elemen

1979-07-05

1981-07-07

Wright, Jr., Ernest T.

Typewriting machines

Case-shift mechanism

For case-shift by type-head movement

4001614, B41J 2524

Patent

active

042771889

ABSTRACT:
A device is disclosed for shifting a bifurcated rack from one position to a second position, thereby engaging alternate sides of a bifurcated rack member with a pinion in a spacially fixed position. The rack shift mechanism is controlled by a direct link to the keyboard of the typewriter which responds to movement of a shift key lever. The mechanism performs a force multiplication and, at the same time, a displacement division function to reduce a relatively large key lever and link displacement to a relatively small rack displacement with a correspondingly higher force factor. The force multiplication linkage translates the rack of the rack/pinion pair to engage the alternate portion of the rack, thereby reversing the rotation of the pinion and allowing the selection from the opposite hemisphere of the type element in response to a selection output.

REFERENCES:
patent: 3885662 (1975-05-01), Schaefer
patent: 3892304 (1975-07-01), Shakib
patent: 3948381 (1976-04-01), McDaniel et al.
patent: 3981386 (1976-09-01), Abell et al.
patent: 3983984 (1976-10-01), de Kler
IBM Technical Disclosure Bulletin, "Nonhoming Translating Rack Shift Mechanism", Henderson et al., vol. 18, No. 11, Apr. 1976, pp. 3748-3749.
IBM Technical Disclosure Bulletin, "88-Character Case Shift Mechanism", Abell, vol. 18, No. 11, Apr. 1976, pp. 3751-3752.
IBM Technical Disclosure Bulletin, "Independently Adjustable Rack Toggle Mechanism", Henderson et al., vol. 20, No. 2, Jul. 1977, p. 656.

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