| 摘要 |
<p>Printing wheel for adjustable printing registration markings, includes a number of printing disc with peripheral embossed symbols each disch has a flanged part with a peripheral tooth sections, one for each embossed symbol. The disc which are coaxial fitted adjacent to each other are individually adjustable with a pawl and ratchet arrangement. A key board arrangement with lift magnets engage in the ratchet and safety pawl arrangement may be used. The spring loaded ratchet device enables selective operation of the desired symbol to be brought into an operative condition.</p> |
