FR2862901A3 - SAW DIRECTION POSITIONING SYSTEM FOR A SAW - Google Patents

Abstract

The present invention relates to a sawing direction positioning system for a bench saw comprising an illumination module for emitting a flat light beam installed to a protective plate of said bench saw, said illumination module being connected. to a power supply via a wire and positioned to forward and downwardly emit said flat light beam so that said flat light beam exactly coincides with the center plane of a circular saw blade mounted on said bench saw. The line of projection of the flat light beam onto a sawn timber is a very thin straight line which marks the sawing direction for the circular saw blade. During sawing, the projection line of the flat light beam always passes over the timber to be sawed and is not obstructed by sawdust. The operator can have a good field of vision and push the lumber forward along the straight line to ensure that the sawing direction is correct or stays aligned with the drawn straight line, thus preventing the cut. from shifting and reducing rejected products.

Description

2862901 1

  SAW DIRECTION POSITIONING SYSTEM FOR ONE

  FIELD OF THE INVENTION The present invention relates to a positioning system and more particularly to a sawing direction positioning system for a bench saw.

Description of the prior art

  A bench saw is a woodworking machine that saws wood in a linear fashion. When a conventional bench saw is used for sawing a wood, a guide plate is set in advance as appropriate on the bench saw and the sawing wood is then pushed forward against the guide plate. during work. Alternatively, a straight line is drawn on the sawing wood and the sawing wood is then pushed forward along the straight line during the work. During sawing, an operator should keep an eye on the position of the wood to ensure that the sawing direction is correct or remains aligned with the straight line drawn, thus preventing the kerf from shifting. However, other items such as sawdust can obstruct the line of sight of the operator so it is difficult for the operator to control the sawing, resulting in many rejected products.

  A conventional sawing direction positioning system using a laser beam was known. This system can be attached to a circular saw blade and rotate with the circular saw blade by emitting a straight beam. The straight beam projecting onto the sawing wood forms a straight line to mark the direction of sawing. However, this system is very complicated in structure because it is supplied with electricity by means of an electric broom.

  SUMMARY OF THE INVENTION It is an object of the present invention to overcome the defects and problems of the prior art and to provide a sawing direction positioning system for a bench saw, which can reduce the tolerance of defects in machining in shape and size, avoid complicated and vulnerable electric broom defects, have a simple structure and a practical side as to fit, and emit various colored lights that do not hurt the eyes of the operator to respond requirements in different applications.

  To achieve the object of the invention, a sawing direction positioning system for a bench saw is provided comprising a lighting module for emitting a flat light beam installed to a protection plate of said bench saw. said lighting module being connected to a power supply via a wire and positioned to emit forward and downward said flat light beam so that said flat light beam coincides exactly with the central plane of the light. a circular saw blade mounted on said bench saw. The projection line of the flat light beam on a sawing wood is a very thin straight line that marks the sawing direction for the circular saw blade.

  By adjusting a mounting screw, the sawing direction positioning system for a bench saw according to the present invention is installed so that its center line coincides exactly with the center plane of a circular saw blade. In use, the sawing direction positioning system for a bench saw is turned on and the flat light beam emitted from the lighting module projects a straight line on the wood. During sawing, by manually adjusting the wood, the projection line always passes through the marked points or keeps the alignment with the line drawn on the wood, and the saw blade always saw the wood along the projection line . Thus, a desired kerf is shaped.

  The line of projection is very clear and is not impeded by sawdust, thus reducing the rate of rejection and avoiding waste.

  The power supply may be a permanent magnet generator comprising two permanent magnets symmetrically provided on a saw motor shaft, two serially connected windings attached to the frame of the bench saw and the wire connecting the two windings to the lighting module. The two permanent magnets and the two windings are located so that the distances from their axes to the axis of the motor shaft are equal to each other. In operation, the two permanent magnets rotate synchronously with the motor shaft of the bench saw and the resulting magnetic lines are cut by two windings, thereby producing a voltage induced in the windings to power the lighting module. In this way, the complicated and vulnerable electric broom 2862901 4 can be omitted. The sawing direction positioning system can be automatically controlled because a flat light beam is emitted as long as the engine is running. In addition, no other power supply is available, saving energy.

  The lighting module can use a light-emitting diode as its light source to emit visible light.

  Alternatively, the lighting module may use a laser diode as a light source. Such a lighting module has an intensive energy and the light emitted from it is brighter and brighter.

  The light-emitting diode may be one of a monochromatic light-emitting diode, a two-color light-emitting diode, or an RGB light-emitting diode. The two-color light-emitting diode or the RGB light-emitting diode may emit monochromatic light as needed under the control of a control circuit. To make the very thin straight line clear, the color of the flat light beam is chosen to contrast strongly with that of the sawing wood, for example, the white, blue or red color. In other words, a respective light emitting diode may be chosen to emit a respective flat light beam of color. In the case where a two-color light-emitting diode is used, it is possible to emit a desired monochromatic light under control of the control circuit. In the case where an RGB light emitting diode is used, by means of the control circuit it is possible not only to emit trichromatic light of red, green and blue, but also to emit light of any color. The 2862901 5 light-emitting diode does not hurt the eyes of the operator and is safe and cheap.

  The light emitting diode may be installed in a parabolic reflecting mirror provided with a heat dissipation port at the rear end, and the light emitted from the light module passes through a lens group to form the flat light beam. Such an arrangement may further increase the efficiency of the light emitting diode and make the light beam brighter.

  The orientation of the lighting module is adjustable so that it is more convenient to use.

  The lens group may comprise a convergent lens disposed coaxially in front of the light emitting diode or laser diode and a cylindrical lens disposed coaxially in front of the converging lens. The light emitted from the light source is converged by the convergent lens and then passes through the cylindrical lens to form the flat light beam. Of course, one can also use a corrugated lens instead of the cylindrical lens. Other optical elements are suitable for such use.

  The object of the invention is thus realized.

  The sawing direction positioning system for a bench saw according to the present invention is simple and inexpensive. During sawing, the adjustment can be done easily so that the sawing wood is placed quickly and accurately along a proper sawing direction. It can be used widely in various bench saws.

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Brief description of the drawings

  Figure 1 is a schematic view showing a bench saw equipped with a sawing direction positioning system according to the present invention.

  Fig. 2 is a schematic view showing a permanent magnet generator according to the present invention.

  Fig. 3 is a schematic diagram showing the lighting module according to the present invention.

  Fig. 4 is a schematic diagram showing the lighting module according to another embodiment of the present invention.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As indicated in FIGS. 1 and 3, a lighting module 3 for emitting a flat light beam is installed on a protection plate 2 of a bench saw 1. The lighting module 3 is connected to a power supply via a wire 4. The lighting module 3 can emit forwards and downwards a flat light beam 7 which coincides exactly with the central plane of a blade of light. circular saw 11 mounted on the bench saw. The projection line of the flat light beam 7 on a wood 8 to be sawed, that is to say the crossing line of the flat light beam 7 and the wood 8 is a very thin straight line 9.

  The lighting module 3 according to the present invention uses a light-emitting diode 14 as its light source to emit visible light. The light emitting diode 14 is an RGB light emitting diode. The lighting module 3 also comprises a control circuit 17. The light emitted from the lighting module 3 passes through a lens group 13 to form the flat light beam 7. The light-emitting diode 14 is installed in a parabolic reflecting mirror 5 provided with an orifice 6 for the dispersion of heat at the rear end.

  Alternatively, the light-emitting diode 14 is a two-color light-emitting diode emitting red and white light. The two-color light-emitting diode is controlled by the control circuit 17 to emit red or white light as required.

  As shown in Figures 2 and 4, the sawing direction positioning system for a bench saw according to the present invention is electrically powered by a permanent magnet generator. The permanent magnet generator comprises two permanent magnets 16 placed symmetrically on a shaft of the engine of the bench saw 1, two windings 12 connected in series and fixed to the frame 18 of the bench saw 1 and the wire 4 connecting two windings 12 to the lighting module 3. Two permanent magnets 16 and two windings 12 are placed so that the distances from their axes to the axis of the motor shaft 15 are equal to each other. Alternatively, the lighting module 3 can use a laser diode 10 as a light source and be installed at the protection plate 2.

  The sawing direction positioning system for a bench saw as described above marks the sawing direction by means of a flat light beam, thus increasing the rate of finished products, meeting the requirements for colors of different applications. , simplifying the structure and offering a convenience of 2862901 8 setting. The sawing direction positioning system can be used widely in various bench saws.

  Having described the invention in detail, one skilled in the art will appreciate that modifications of the present invention can be made without departing from his mind. Therefore, the intention is not to limit the present invention to only the preferred embodiments illustrated and described. On the contrary, the scope of the invention is to be determined by the appended claims and their equivalents.

Claims (1)

9 CLAIMS   A sawing direction positioning system for a bench saw comprising a lighting module (3) for emitting a flat light beam (7) installed to a protection plate (2) of said bench saw (1). ), said lighting module (3) being connected to a power supply via a wire (4) and positioned to emit forward and downward said flat light beam (7) so that said flat light beam (7) coincides exactly with the central plane of a circular saw blade (11) mounted on said bench saw (1).   The sawing direction positioning system according to claim 1, wherein said power supply is a permanent magnet generator comprising two permanent magnets (16) provided symmetrically on a shaft (15) of the motor of said bench saw (1). ), two windings (12) connected in series and fixed to the frame (18) of said bench saw (1) and the wire (4) connecting said two windings (12) to said lighting module (3).   The sawing direction positioning system according to claim 2, wherein said two permanent magnets (16) and said two windings (12) are placed so that the distances from their axes to the axis of the shaft (15) ) of the motor are equal to each other.   The sawing direction positioning system according to claim 1 or 2, wherein said illumination module (3) uses a light emitting diode (14) as its light source for emitting visible light.   The sawing direction positioning system according to claim 1 or 2, wherein said lighting module (3) uses a laser diode (10) as its light source.   The sawing direction positioning system according to claim 4, wherein said light emitting diode (14) is one of a monochromatic light emitting diode, a two color light emitting diode and an RGB light emitting diode.   The sawing direction positioning system according to claim 4, wherein said lighting module (3) also comprises a control circuit (17) and said two-color light emitting diode or said RGB light emitting diode emits a monochromatic light as needed by means of the control circuit (17).   The sawing direction positioning system according to claim 4, 6 or 7, wherein said light emitting diode (14) is installed in a parabolic reflecting mirror (5) provided with an orifice (6) for heat dispersion at the rear end, and the light emitted from the lighting module (3) passes through a lens group (13) to form said flat light beam (7).