US PATENT SUBCLASS 400 / 157
.~.~.~ Including type-faces arranged along helical path(s)

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

139  DF  INCLUDING TYPE-SET-ASSEMBLAGE MOUNTED ON CARRIER AND RELATIVELY MOVABLE FOR SELECTION AND FOR IMPACT OF TYPE-FACE {11}
153  DF  .~ Imprint by movement of record-medium against type-face {3}
154  DF  .~.~ By hammer impacting record-medium against type-face on type-head (e.g., type shuttle, etc.) {3}
157.~.~.~ Including type-faces arranged along helical path(s)

DEFINITION

Classification: 400/157

Including type-faces arranged along helical path(s):

(under subclass 154) Subject matter wherein the typewriter is provided with a type-head* that is formed as a rotatable, cylindroidal member having type-face* elements on the cylindroidal surface thereof, which type-face elements are arrayed as a helix on the cylindroidal surface, and wherein selection or choice of the type-face that is to be impressed

against the record-medium* is made from one of the helically arrayed elements.

(1) Note. The type-set-assemblage* of type-faces may be arranged in one or more helical paths.