| 摘要 |
<p>A machine is used for printing on drawings. It comprises a typewriter printing mechanism (1) disposed at the drawing surface of a drawing board. The mechanism is connected to a parallel motion guide system supporting the mechanism for parallel movement across the board. The mechanism includes a spherical printing head (7). A keyboard (19) is also provided although the machine may be operated by data processor. The letter spacing may be effected by an electric motor (at 6) acting on the guide system, but general positioning of the machine on the board is by hand.</p> |
