JP7213340B2 - Portable machine tool - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable machine tool, and more particularly to a portable machine tool equipped with an illumination device for illuminating the tip of a work tool.

A portable machine tool is brought to a work site and used. Portable machine tools are used in a variety of environments, sometimes in dark rooms or at night with no external lighting. A portable machine tool equipped with a lighting system has been developed so that it can be used in such a dark environment. For example, Patent Literatures 1 and 2 disclose a portable machine tool in which an illumination device is provided in a fixing portion having an electromagnet for fixing a portable machine tool to a workpiece so that an annular cutter can be illuminated from the side. A perforator is disclosed. The annular cutter has an annular blade and a center pin extending along the axis of rotation of the blade. It is designed for positioning. Therefore, when the work place is dark, it is necessary to brightly illuminate the tip of the center pin and its surroundings. When light is irradiated from above, the tip of the center pin is hidden behind the blade, making it difficult to irradiate the tip of the center pin with light. By irradiating the center pin with light from the side, it is possible to brightly illuminate the tip of the center pin and its surroundings without being obstructed by the blade.

Japanese Patent No. 4474155 U.S. Pat. No. 9,889,508

When a working tool such as an annular cutter is used for machining, chips generated by the machining are flung laterally from the working tool due to the rotation of the working tool. In addition, elongated chips adhering to the working tool may rotate together with the working tool. As described above, when the lighting device is provided on the fixed portion at the lateral position of the work tool, chips may strike the lighting device. As a result, there is a risk that the light emitting surface of the lighting device will be damaged or soiled, making it impossible to irradiate sufficient light.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a portable machine tool capable of illuminating a work tool from the side while preventing the illuminating device from being affected by chips.

That is, the present invention
a machine tool main body having a power section and a tool mounting section rotationally driven by the power section;
a reflecting surface arranged so as to face the working tool at a lateral position of the working tool attached to the tool mounting portion and extending to the outside of the machine tool body;
a lighting device arranged so as to emit light obliquely to the reflecting surface, and the light reflected by the reflecting surface illuminates the tip of the work tool and its surroundings;
To provide a portable machine tool comprising:

In the portable machine tool, the light reflected by the reflective surface at the lateral position of the working tool illuminates the periphery of the tip of the working tool. That is, since the tip of the working tool is illuminated from the side, the tip is not sufficiently illuminated due to the shadow of other parts of the working tool. In addition, since reflected light is emitted, there is no need to place the lighting device on the side of the work tool. Since it can be arranged, it is possible to prevent the lighting device from being damaged or soiled by chips generated by the machining operation.

again,
The tool mounting portion is vertically movable,
A fixing part may be further provided which is positioned below the machine tool body and is adapted to fix the machine tool body to the workpiece. Further, the illumination device may be arranged inside the machine tool body, and the light of the illumination device may be emitted from the lower surface of the machine tool body.

In this case, the reflecting surface can be a part of the side surface of the fixed portion.

With such a configuration, there is no need to separately provide a member having a reflective surface, and the structure can be simplified.

Furthermore,
The tool mounting portion is positioned forward of the fixing portion,
The lighting device is arranged at a position shifted to one side in the horizontal direction with respect to the work tool attached to the tool mounting portion, and emits light downward and rearward to the other side in the horizontal direction. can be used to irradiate the reflective surface.

To suitably illuminate the tip of a working tool with light emitted from the lighting device by setting the positional relationship between the tool mounting portion, the front side surface of the fixing portion as a reflecting surface, and the lighting device as described above. becomes possible.

The illumination device may emit light in a diffused manner so that the light reflected by the reflecting surface spreads over the tip of the tool and its surroundings. The degree of diffusion of light is appropriately designed as required.

The work tool may be an annular cutter having an annular blade and a center pin extending vertically through the center of the blade, and the tip of the center pin may be the tip of the tool. can be

The center pin extends downward from the annular blade portion and positions the annular blade portion with respect to the machining site of the workpiece. Since the light is reflected by a certain reflecting surface and radiated to the tip of the center pin, the tip of the center pin is not shaded by the blade and is sufficiently illuminated.

Furthermore, the illumination device may include a light source and a light guide member that directs light emitted from the light source toward the reflecting surface.

By using the light guide member, it becomes easy to design so that the light from the light source is directed to the reflecting surface in a suitable state.

An embodiment of a portable machine tool according to the present invention will be described below with reference to the accompanying drawings.

1 is a side view of a portable machine tool according to an embodiment of the present invention; FIG. FIG. 2 is a top view of the portable machine tool of FIG. 1; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2; 3 is a cross-sectional view taken along line VV of FIG. 2; FIG. FIG. 2 is a perspective view of a lighting device included in the portable machine tool of FIG. 1 as viewed obliquely from above; FIG. 7 is a perspective view of the lighting device of FIG. 6 as seen obliquely from below; Figure 7 is a front view of the lighting device of Figure 6; FIG. 7 is a left side view of the lighting device of FIG. 6; It is the perspective view which looked at the front part of the portable machine tool of FIG. 1 from the diagonally downward direction. It is the perspective view which looked at the front part of the portable machine tool of FIG. 1 from diagonally upward.

As shown in FIGS. 1 and 2, a portable machine tool 1 according to an embodiment of the present invention includes a machine tool main body 10, a fixing portion 12 fixed to the lower side of the machine tool main body 10, and a machine tool main body. and a battery 14 detachably attached to the rear of 10 . As shown in FIG. 3, the machine tool main body 10 has therein a work tool mounting portion 18 for detachably mounting an annular cutter 16 (work tool) at a front position of the fixed portion 12, and a work tool mounting portion 18. and a power unit 19 for rotational driving. The power section 19 is mainly composed of a motor 20 and a gear mechanism 22 composed of a plurality of gears. The work tool mounting portion 18 is vertically moved by pivoting a lever 24 mounted on the side surface of the machine tool main body 10 so that the annular cutter 16 can be vertically moved. The fixed part 12 includes a first electromagnet 28 having a ring-shaped first coil 26 and a second electromagnet 32 having a ring-shaped second coil 30 . When electric power is supplied to the first coil 26 and the second coil 30 while the portable machine tool 1 is placed on a magnetic material, the magnetic adsorption force generated by the first electromagnet 28 and the second electromagnet 32 causes the , the machine tool body 10 is fixed to the magnetic material. The portable machine tool 1 has a machine tool main body 10 fixed to a workpiece M made of a magnetic material by a first electromagnet 28 and a second electromagnet 32, and an annular cutter rotated by a power unit 19. 16 is pressed against the workpiece M to perforate the workpiece M. The annular cutter 16 has an annular blade portion 34 and a center pin 36 extending vertically through the center of the blade portion 34 .

As shown in FIG. 1, a motor drive switch 38 for starting driving the motor 20, a motor stop switch 40 for stopping driving the motor 20, and a first electromagnet 28 are provided on the side of the machine tool body 10. and an electromagnet switch 42 for starting and stopping the driving of the second electromagnet 32 . A lighting switch 44 for turning on and off a lighting device 46, which will be described later, is also arranged on the side surface of the machine tool main body 10. As shown in FIG. These switches 38, 40, 42, and 44 are all momentary switches that are ON only while being pressed and return OFF when released.

As shown in FIG. 3 , a first magnetic sensor 48 and a second magnetic sensor 50 are further attached to the fixed portion 12 . The first magnetic sensor 48 is arranged above the first electromagnet 28 and measures the magnetic flux density around the first electromagnet 28 . The second magnetic sensor 50 is arranged above the second electromagnet 32 and measures the magnetic flux density around the second electromagnet 32 . Based on the output values of the first magnetic sensor 48 and the second magnetic sensor 50, the portable machine tool 1 controls the electric power supplied to the first electromagnet 28 and the second electromagnet 32, and controls the necessary and sufficient magnetic attraction force. is obtained, and it is displayed on the LED display section.

As shown in FIGS. 4 and 5, the illumination device 46 is located in the machine tool body 10 at a position shifted leftward (leftward as viewed in FIGS. 5 and 8) with respect to the annular cutter 16 when viewed from the front. are placed in The illumination device 46 has an LED element 52 as a light source and a light guide member 54 made of a transparent resin material. The light guide member 54 has an insertion hole 56 into which the LED element 52 is inserted, as also shown in FIGS. The bottom surface of the insertion hole 56 forms an inclined incident surface 58 , and the light emitted from the LED element 52 enters the light guide member 54 mainly through the incident surface 58 . The incident surface 58 is directed downward toward the front of the portable machine tool 1 as a whole (right side as viewed in FIGS. 4 and 9) and left side as viewed from the front (left side as viewed in FIGS. 5 and 8). Inclined. The incident surface 58 can be configured to have a slightly convex shape upward toward the LED element 52 so that the diffusion of the light incident on the light guide member 54 can be suppressed to some extent. Light entering the light guide member 54 from the incident surface 58 is emitted from the light emitting surface 60 that is the bottom surface of the light guide member 54 . The exit surface 60 is larger than the entrance surface 58 and is inclined in the direction opposite to the entrance surface 58 . 4 and 9) and to the right when viewed from the front (right when viewed in FIGS. 5 and 8).

As shown in FIGS. 4, 5, 10, and 11, the light L emitted from the illumination device 46 passes through a transparent cover 62 attached to the machine tool body 10 and passes through the machine tool body 10. It is emitted from the window 64 of the lower surface 10a. Since the entrance surface 58 and the exit surface 60 are inclined as described above, the light emitted from the LED element 52 is refracted at the entrance surface 58 and the exit surface 60 . The light L emitted from the emission surface 60 is diffused to some extent and directed to the right side and the lower rear side, and is irradiated to the front side surface 12 a of the fixed portion 12 . The side surface 12a faces the annular cutter 16 at a side position of the annular cutter 16 extending to the outside of the machine tool body 10, and the light L reflected by the side surface 12a reaches the tip portion 36a of the center pin 36 of the annular cutter 16. It spreads and radiates around it. That is, in the portable machine tool 1, the light L emitted from the lighting device 46 is obliquely applied downward to the side surface 12a of the fixed portion 12 functioning as a reflecting surface, and the light L reflected by the side surface 12a is designed to illuminate the tip 36a of the center pin 36 of the annular cutter 16 and its surroundings. By doing so, even when the tip portion 36a of the center pin 36 is in contact with the machining portion of the workpiece M, the tip portion 36a and its surroundings are not hidden behind the annular cutter 16 and are brightly illuminated. become. In addition, since the illumination device 46 is positioned above the machined portion, there is no risk of the emission surface 60 of the light guide member 54 or the cover 62 being damaged or soiled by shavings generated during the perforating process by the annular cutter 16 .

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, the working tool may be a machine tool that uses, for example, a drill instead of an annular cutter. Since the tip angle of the drill is usually 120 degrees, especially when using a large-diameter drill, there is a possibility that the tip of the drill cannot be illuminated by illumination from above. can illuminate the tip. Further, the fixing portion for fixing the tool main body does not use an electromagnet, but may use, for example, magnetic attraction by a permanent magnet or vacuum attraction by a vacuum device, or may be mechanically fixed by a vise or the like. It may be configured as follows. Alternatively, it may be a hand-held type machine tool that does not have a fixed part and is used by holding it by hand. Furthermore, the reflecting surface does not have to be the side surface of the fixed part. You may make it attach a member to a machine tool main body or a fixed part. The light guide member of the illumination device does not have the shape described above, and may be configured by combining a plurality of optical components such as lenses, or may be configured by optical fibers. Alternatively, the illuminating device may be configured such that the reflective surface is directly irradiated with the light from the light source without the light guide member. Furthermore, a plurality of lighting devices can be arranged to illuminate the tip of the work tool from a plurality of directions. Although the battery is used as the power source in the above embodiment, it may be connected to an external power source such as an AC power source.

1 portable machine tool 10 machine tool main body 10a lower surface 12 fixed part 12a side surface (reflecting surface)
14 battery 16 annular cutter (work tool)
18 work tool mounting portion (tool mounting portion)
19 power section 20 motor 22 gear mechanism 24 lever 26 first coil 28 first electromagnet 30 second coil 32 second electromagnet 34 blade section 36 center pin 36a tip section 38 motor drive switch 40 motor stop switch 42 electromagnet switch 44 lighting switch 46 Lighting device 48 First magnetic sensor 50 Second magnetic sensor 52 LED element (light source)
54 light guide member 56 insertion hole 58 entrance surface 60 exit surface 62 cover 64 window L light M workpiece

Claims (8)

a machine tool main body having a power section and a tool mounting section that is rotatably driven by the power section and vertically movable ;
a fixing part positioned below the machine tool body and adapted to fix the machine tool body to a workpiece;
a reflecting surface disposed on the fixing portion so as to face the working tool at a lateral position of the working tool attached to the tool mounting portion and extending to the outside of the machine tool body;
a lighting device disposed on the machine tool body so as to emit light obliquely to the reflecting surface and reflected by the reflecting surface to illuminate the tip of the work tool and its surroundings;
A portable machine tool with 2. The portable machine tool according to claim 1 , wherein said lighting device is disposed within said machine tool body, and light from said lighting device is emitted from the lower surface of said machine tool body. 3. The portable machine tool according to claim 1 , wherein said reflective surface is a part of a side surface of said fixed portion. a machine tool main body having a power section and a tool mounting section that is rotatably driven by the power section and vertically movable;
a fixing part positioned below the machine tool body and configured to fix the machine tool body to a workpiece;
a reflecting surface arranged so as to face the working tool at a lateral position of the working tool attached to the tool mounting portion and extending to the outside of the machine tool body;
a lighting device arranged so as to emit light obliquely to the reflecting surface, and the light reflected by the reflecting surface illuminates the tip of the work tool and its surroundings;
with
The portable machine tool, wherein the reflective surface is a part of the side surface of the fixed part. The tool mounting portion is positioned forward of the fixing portion,
The lighting device is arranged at a position shifted to one side in the horizontal direction with respect to the work tool attached to the tool mounting portion, and emits light downward and rearward to the other side in the horizontal direction. 5. The portable machine tool according to claim 3 or 4, wherein the reflective surface is irradiated with light. 6. The lighting device according to any one of claims 1 to 5, wherein the illumination device emits light in a diffused manner so that the light reflected by the reflecting surface spreads over the tip of the work tool and its surroundings. Portable machine tool described in paragraph. 3. The work tool is an annular cutter having an annular blade portion and a center pin extending vertically through the center of the blade portion, and the tip portion of the center pin is the tip portion of the work tool. 7. The portable machine tool according to any one of 1 to 6. The portable machine tool according to any one of claims 1 to 7, wherein said illumination device has a light source and a light guide member that directs light emitted from said light source to said reflecting surface.

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