US PATENT SUBCLASS 400 / 165
.~.~.~ Simultaneous rotation and translation of type-head by manually powered actuation (e.g., helical shift)


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}
160  DF  .~ Imprint by pivoting of type-head-carrier and type-head against record-medium {7}
162  DF  .~.~ Type-head movable for selection of type-face {14}
165.~.~.~ Simultaneous rotation and translation of type-head by manually powered actuation (e.g., helical shift)


DEFINITION

Classification: 400/165

Simultaneous rotation and translation of type-head by manually powered actuation (e.g., helical shift):

(under subclass 162) Subject matter wherein said selecting mechanism moves 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 a record-medium* is made by turning the member about its axis of rotation and moving the member along the axis at the same time it is turning, the movement being caused by a hand of the typist.