| 摘要 |
<p>The invention provides a rotor position selection mechanism for stopping rotary motion of one or more rotors or print wheels in a print head at desired angular positions each corresponding to a character on the rotor which is required to be printed. The rotor has a group of recesses positioned on a reference grid and located on the rotor so that as the rotor revolves,each group of recesses passes a set of feelers whose positions can be selected to correspond to any one of the patterns of recesses. In operation the positions of the feelers are set to represent a selected code word corresponding to one of the characters in the print wheel and a catch operated by all the set feelers sensing all the recesses on the rotor corresponding to the selected code word moves into a hole in the rotor to arrest its motion. Several rotors or print wheels may be provided, each with an associated group of feelers and a common setting mechanism may be used to set each group of feelers to a different selected code word so that a line of print may be formed by the print wheels being arrested at positions corresponding to the selected code words.</p> |
