| 摘要 |
A line-marking device with rotatable laser disclosed in the present inventi on comprises a laser rotating and locating system including a fixing member and a rotating member, one of which has a gear-shaped component, and the other member of which has a component that can be engaged with the gear-shaped component, and an elastic member pressing the engaged component to the gear-shaped component. The laser- emitting device is fixedly connected to the rotating member. A straight line formed by the lase r on a wall can be rotated along with the rotating member. In an effect of the elastic member a nd by the interaction between the gear-shaped component and the engaging component for it, a location can be obtained when the two component is rotated across a space of a tooth, so that a fan-shaped beam emitted from the laser line-marking device can not only be rotated from the 0 degree to the 360 degrees, but also be reliably located at a plurality of angles.
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