| 摘要 |
An orbital marking pencil includes a body assembly, a rotator assembly and a rotational support. The body assembly includes a plunger, a main spring and a support spring. A convoluted race is formed on an inner surface of the body assembly. The rotator assembly includes a rotator spring and at least two ball bearings. The rotator spring opens a collet that retains a piece of lead. The ball bearings are received in the convoluted race. The depression of the body assembly in a vertical movement actuates the ball bearings within the convoluted race, thereby rotating the lead in an orbital movement. The support spring provides resistance to return the rotational support to a starting position, the main spring provides resistance for and returns the rotator assembly to a starting position, and the rotator spring provides resistance for and returns the plunger to a starting position.
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