| 摘要 |
A line printer having a plurality of printing rings having characters on the peripheries thereof and coaxially arranged adjacent to each other on a driving shaft rotated in one and the same direction during each printing cycle with springs connected between the respective printing rings and the driving shaft so that the respective printing rings can be yieldably driven by the driving shaft through the springs and a movable roller pad adapted to abut against the printing rings at the predetermined printing position so that the selected character each of the printing rings temporarily held at the printing position during the rotation of the driving shaft is simultaneously printed on a sheet of paper held between the printing rings and the roller pad. The outer end each of the springs is supported by a stopper member having an engaging portion and secured to the driving shaft for rotation therewith while the inner end of each of the springs is held by the respective printing ring so that the respective printing ring is resiliently urged by the spring so as to cause the engaging portion of the respective stopper member to abut against an arresting portion of the respective printing ring thereby positioning the respective printing ring at the predetermined angular position with respect to the driving shaft. Thus, the desired character of each of the printing operation rings for the printing can be selected and positioned at the printing position by temporarily arresting selectively the respective printing ring by arresting means during the rotation of the driving shaft against the action of thespring.
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