| 摘要 |
A marker, which prints a concentric element such as a nut, bolt, or the like, for example, when moved into engagement with a surface, is retained adjacent one end of a base by magnets within the base. The marker is carried on a protruding portion of a support, which is slidably mounted within the base and carries a locating pin extending longitudinally therefrom and through the marker. When the locating pin is disposed on the surface at the point at which the center of the nut or bolt is to be located, a spring, which acts on the locating pin, is overcome by depressing the base so that the marker can be moved into engagement with the surface at the desired location. After printing, the marker is released from the effect of the magnets by pushing the support away from the base whereby the field of the magnets is no longer effective so that the marker drops off of the support by gravity.
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