1. Field of the Invention
This invention relates to a circular saw, more particularly to a circular saw with a sawing path indicating device that can form a precise demarcation line on a workpiece and that can illuminate a sawing area.
2. Description of the Related Art
Referring to
The object of the present invention is to provide a circular saw with a sawing path indicating device that can form a precise demarcation line on a workpiece and that can illuminate a sawing area.
According to this invention, the circular saw includes a blade supporting member, a saw blade shaft mounted on and rotatable relative to the blade supporting member about a blade axis, a circular saw blade mounted on and rotated with the saw blade shaft, and having left and right major surfaces opposite to each other along the blade axis, and a blade edge periphery which interconnects the left and right major surfaces and which is adapted to be brought towards a surface of a workpiece, a seat member disposed on the saw blade shaft adjacent to the left major surface, and rotated with the saw blade shaft about the blade axis, and an illuminating unit disposed on the seat member. Light beam emitted from the illuminating unit is directed radially and outwardly to project on a light reflecting area of the blade edge periphery and is reflected by the left major surface such that, during rotation of the blade edge periphery, a bright region and a dim region which is a shadow cast by the sawing blade are formed on the surface of the workpiece, thereby creating a sharp demarcation line between the bright and dim regions. The demarcation line corresponds to the position of the blade edge periphery on the workpiece in a sawing operation, and indicates a sawing path for the saw blade.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment of the invention, with reference to the accompanying drawings, in which:
Referring to
With further reference to FIGS. 4 to 6, this invention is mainly characterized in that the sawing path indicating device 30 includes a body 301 composed of a seat member 31 and a protective shell 32, a circular transparent shield 33, an illuminating unit including a plurality of LED lamps 35, and a circuit unit 34.
The seat member 31 is disposed on the saw blade shaft 24 adjacent to the left major surface 231 of the saw blade 23, and is rotated with the saw blade shaft 24 about the blade axis. The seat member 31 includes a seat portion 311 formed with an axial hole 312 for passage of the saw blade shaft 24 therethrough such that the seat member 31 is secured on the saw blade shaft 24. Furthermore, the seat member 31 has a periphery, and a peripheral wall 318 which extends from the periphery in an axial direction parallel to the blade axis of the saw blade shaft 24. A plurality of annular grooves 317 are formed in the peripheral wall 318. The protective shell 32 includes a major wall 322 formed with an axial hole 321 that is aligned with the axial hole 312 along the blade axis, and a projecting edge 323 which surrounds the major wall 322 and which is coupled to the peripheral wall 318 by means of screw fasteners 36 so as to cooperatively form a rim portion 302 with the peripheral wall 318. The rim portion 302 surrounds the blade axis so as to confine an accommodation chamber between the major wall 322 and the seat portion 311, and has a plurality of light penetrating regions in form of circular through openings 303 which extend therethrough to be communicated with the accommodation chamber and which are angularly displaced from one another about the blade axis. A plurality of rib plates 314 are formed on the seat portion 311 to partition the accommodation chamber into a plurality of battery seats 315 for mounting a plurality of batteries 342 of the circuit unit 34 and a plurality of lamp seats 316 for mounting the LED lamps 35, as shown in
The circuit unit 34 includes a circuit board 341 which is mounted in the accommodation chamber, and which is electrically connected to the batteries 342 and terminals 351 of the LED lamps 35, thereby permitting supply of electricity to the LED lamps 35.
The transparent shield 33 has a predetermined color, and has a peripheral edge mounted in the annular grooves 317 so as to cover the through openings 303.
In operation, light emitted from the LED lamps 35 is directed radially and outwardly through the through openings 303 to project on a light reflecting area of the blade edge periphery 233 of the saw blade 23 and is reflected by the left major surface 231 of the saw blade 23. Thus, during rotation of the saw blade 23, a bright region 102 and a dim region 103 which is a shadow cast by the sawing blade 23 are formed on the surface of the workpiece 100, thereby creating a sharp demarcation line 101 between the bright and dim regions 102, 103. The demarcation line 101 corresponds to the position of the blade edge periphery 233 on the work piece 100 in a sawing operation, and indicates a sawing path for the saw blade 23.
According to this invention, the LED lamps 35 can emit soft and bright light that is not harmful to the operator, and that enables the forming of a sharp demarcation line 101 on the workpiece 100 to precisely indicate a sawing path of the saw blade 23. Moreover, the LED lamps 35 can illuminate.
While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretations and equivalent arrangements.
Number | Date | Country | Kind |
---|---|---|---|
092211690 | Jun 2003 | TW | national |