| 摘要 |
A ruler for fixed-distance movement which includes a guide member provided at one end of a linear ruler section and slidable at a specified angle along a guide section of a base plate; a leaf spring containing a projection, mounted at the same one end of the ruler section; a corrugated gear provided along the same guide section of the base plate, the corrugated gear having a plurality of recesses at regular intervals for engagement with the projection of the leaf spring. The projection of the leaf spring, when engaged with a recess of the corrugated gear, stops the movement of the ruler section, thus enabling the ruler section to move step-by-step over a fixed distance at a specified angle to the guide section.
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