| 摘要 |
R. Alas-1 BAR CODE PRINTING MECHANISM A mechanism using a stepping motor as the prime mover for a bar code printing head or hammer mounted on the end of a pivotal lever. Where the output code(such as the postal code used in the U.S.) requires a full bar as one binary indication and a half bar the other binary indication, two motors each with its own printing head are used. The heads are spaced apart longitudinally relative to an object to be printed. A full bar is made up of two half bars, thus, both motors must be energized at separated time intervals to cause both heads to strike in a single transverse alignment to print a full bar. The lever supporting the printing head is constructed to position its center of percussion essentially in alignment with the printing hammer to minimize wear on the motor shaft. |
