| 摘要 |
The invention relates to the provision of a light generating unit which can be used to generate one or more guidance lines, typically via laser generating means mounted within the same. The unit is mounted on a power tool such that the guidance line or lines which are generated, lie at or adjacent to the position of a blade of the power tool when in contact with the work piece so as to provide guidance for the cutting operation. The units are provided with engagement means to allow the unit to be engaged to the power tool at a desired location and in accordance with the invention, once the unit has been secured to the power tool in the required position, an enclosure is provided to fit over the housing of the unit to thereby enclose the engagement means and thereafter prevent access to the same by a user. Thus, the light generating units can be fitted under factory conditions at the required location on the power tool and thereafter cannot be further adjusted while the engagement means are enclosed by the enclosure. It is also possible that adjustment means are provided to allow relative adjustment of the light generating unit and these can also be enclosed within the enclosure to thereby prevent further adjustment by the users.
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