Direct keyboard controlled rack shift device for a single...

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

B - Operations, Transporting

41

J

197/78

B41J 25/24 (2006.01) B41J 7/50 (2006.01)

Patent

CA 1122144

DIRECT KEYBOARD CONTROLLED RACK SHIFT DEVICE FOR A SINGLE ELEMENT TYPEWRITER 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 corres- pondingly 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. LE9-77-018

352801

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