| 摘要 |
A typewriter for writing with a light beam on a photo-sensitive paper includes a translatable typewriter carriage having a sight carried fixedly to a frame of the typewriter defining a region on which an indicia is being written. A light source is carried on a servo-driven trolley along an arcuate track having a center of curvature at the sight portion. A perforate letter template is located along a coaxial arc between the track and the carriage. In response to the depression of a key on a keyboard, for selecting a letter to be typed, the trolley is positioned along the track so that the light therefrom passes through a selected indicia on the template and then to the sight defined region of the paper.
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