JP4870145B2 - Electric tool - Google Patents

Description

  The present invention relates to a technique for rationalizing a configuration of an electric power tool.

  As a technique for cooling a drive motor for driving a work tool in an electric power tool, for example, a technique described in Japanese Patent Laid-Open No. 8-336803 (Patent Document 1) is known. In this prior art, when the drive motor is cooled via the cooling air introduced into the motor housing by the rotation of the fan blade and the cooling air is guided to the circular saw blade case, the cooling air between the motor housing and the blade case is used. A technique for improving motor cooling efficiency by devising a partition wall forming a passage is disclosed.

The above prior art relates to a device for improving motor cooling efficiency or fan performance using fan blades, but there is a demand for further rationalization of the overall configuration of the electric power tool.
JP-A-8-336803

  This invention is made | formed in view of this point, and it aims at contributing to promoting rationalization in the structure of an electric tool.

In order to achieve the above object, the invention described in each claim is configured.
According to the first aspect of the present invention, the work tool that is housed in the blade case and performs a predetermined machining operation on the workpiece, the drive motor that drives the work tool, and the work area of the workpiece are illuminated. The illumination tool includes a first illumination unit that illuminates a normal cutting work area and a second illumination part that illuminates the cutting work area when performing plunge cutting. The electric tool characterized by this is configured.

  ADVANTAGE OF THE INVENTION According to this invention, it became possible to contribute to promoting rationalization in the structure of an electric tool.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the embodiment of the present invention, a circular saw will be described as an example of an electric tool. As shown in FIGS. 1 and 2, a circular saw 101 according to the present embodiment generally includes a main body 103 and a base that is connected to the main body 103 and placed on a workpiece W. 105.

  The main body 103 is formed by connecting a motor housing 111 and a blade case 113 to each other. The motor housing 111 has a handgrip 117 integrally, and houses a drive motor 121 and a cooling fan 131 therein. The cooling fan 131 is disposed on the drive shaft 123 of the drive motor 121 and is rotationally driven integrally with the drive shaft 123 when the drive motor 121 is energized.

  The blade case 113 is provided with a safety cover 115 in a lower area thereof so that the safety cover 115 can be stored therein, and a blade 129 is disposed therein. The blade case 113 has a gear housing 114 that extends toward the motor housing 111 in an integrated manner. The gear housing 114 accommodates a gear 125 and a spindle 127 that are disposed corresponding to the shaft end position of the drive shaft 123 extending into the gear housing 114.

  The blade 129 is attached to the spindle end of the spindle 127 so as to be rotatable integrally with the spindle 127. A gear 125 is provided on the other end side of the spindle 127, and this gear 125 is engaged with and engaged with the shaft end of the drive shaft 123 of the drive motor 121. As a result, the rotational movement of the drive motor 121 is transmitted to the spindle 127 while being appropriately decelerated in the gear 125, whereby the blade 129 is rotationally driven around the spindle 127 and used for cutting the workpiece W.

  In the boundary region between the motor housing 111 and the blade case 113 (gear housing 114), a cooling air ventilation path 133 formed so as to extend from the motor housing 111 is set. One end of the cooling air passage 133 forms a cooling air outlet 135 facing the blade 129 in the blade case 113. A plate member 137 is disposed at the cooling air outlet 135. The plate member 137 is an element constituting the “cooling air guiding means” in the present invention in combination with a cooling air guiding slit 139 described later.

  Further, as shown in detail in FIG. 2, illumination means 141 is provided in the boundary region of the gear housing 114 of the blade case 113. The illumination means 141 has an LED 143 and a lead wire 145 for energizing the LED 143. The LED 143 illuminates the LED 143a that illuminates toward the cutting work area G of the workpiece W by the blade 129 and the cutting work area H (see FIG. 5) when plunge cutting is performed by the circular saw 101 as described later. It consists of LED143b. Details of the plunge cut will be described later. Each LED 143 is appropriately turned on by turning on an illumination means switch 119 provided on the hand grip 117. Further, the lead wires to the respective LEDs 143 are held in the gear housing 114 in a blinded manner by a plate member 137 as shown in FIG.

  The detailed structure of the plate member 137 is shown in FIGS. 3 is a front view of the plate member 137 as viewed from the blade case side, and FIG. 4 is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 3 and 4, the plate member 137 has a large number of cooling air guiding slits 139. Each cooling air guide slit 139 corresponds to the “window” in the present invention and is arranged on the plate member 137 so as to form a predetermined inclination angle D with respect to the horizontal plane as shown in FIG. As a result, the cooling air transported so as to be orthogonal to the surface of the plate member 139 changes its direction to the guiding direction F through the cooling air guiding slit 139 formed in an inclined shape on the plate member 137. Constructed (see also FIGS. 1 and 2).

  The operation of the circular saw 101 configured as described above will be described. In particular, when a trigger switch (not shown) is turned on, the drive motor 121 is energized and the blade 129 is rotationally driven via the drive shaft 123, the gear 125, and the spindle 127. Thereby, as shown in FIG. 2, the blade 129 performs the cutting operation of the workpiece W while being driven to rotate. In FIG. 2, a cutting position by the blade 129 is indicated by a symbol G as a cutting work area while including a black line arrangement position or the like arranged on the workpiece W.

  By driving the drive motor 121, the cooling fan 131 provided on the drive shaft 123 is rotated integrally with the drive shaft 123 (see FIG. 1). As the cooling fan 131 rotates, air outside the circular saw 101 is taken into the motor housing 111 as cooling air and cools the drive motor 121. The cooling air taken into the motor housing 111 is further discharged to the blade 129 side accommodated in the blade case 113 through the cooling air ventilation path 133 and the cooling air discharge port 135 by the rotation of the cooling fan 131. Become.

  The cooling air of the drive motor 121 discharged from the motor housing 111 to the blade 129 side through the cooling air discharge port 135 is formed on the plate member 137 in an inclined shape, as shown in FIGS. 3 and 4. Is sent in the guiding direction F. Accordingly, the cooling air is smoothly guided toward the cutting work area G, and work obstacles such as chips in the cutting work area G are removed. As shown in FIG. 1, the cooling air is guided in the rotational axis direction of the blade 129, in other words, in the direction intersecting the cutting direction of the workpiece W by the blade 129 (left direction of the blade 129 in FIG. 1). Therefore, a situation in which work visibility is hindered such that, for example, the black line on the workpiece becomes invisible with the chips is effectively avoided by blowing the chips in the traveling direction of the circular saw 101. Thus, in the circular saw 101 according to the present embodiment, the cooling air used for cooling the drive motor 121 can be effectively used for removing obstacles such as chips in the cutting work area G. A more rational structure of the circular saw 101 can be obtained.

  Further, in the present embodiment, as shown in FIG. 2, the LED 143 constituting the illuminating means 141 is arranged so as to be positioned in the cooling air guiding direction F, so that the cooling air is cut by the plate member 137 to cut the blade 129. When guiding to the area G, it is possible to blow away the chips and the like staying in the vicinity of the LED 143 (LED 143a and LED 143b), removing the chips and the like in the cutting work area G, and ensuring the visibility by the illumination means 141 Can be performed simultaneously.

  Furthermore, since the plate member 137 is configured to have a function as a support plate for holding the lead wire 145 in the illumination means 141 to the gear housing 114, not only the effective use of the cooling air but also the function members Reasonable setting is possible.

  As shown in FIG. 2, the circular saw 101 is set in the end region of the workpiece W and the blade 129 cuts from the end of the workpiece W as shown in FIG. In general, the blade 129 may be cut from the central region instead of the end region of the workpiece W as shown in FIG. 5 depending on the shape of the workpiece, cutting work conditions, and the like. Such a cutting form is generally called “plunge cut”.

  In the present embodiment, as shown in FIG. 5, when plunge cutting is performed by applying the blade 129 to the cutting work area H, one LED 143b of the illumination means 141 is connected to the plunge cutting cutting work area H. Configured to illuminate. Moreover, since the LED 143b is arranged in the cooling air guiding direction F by the cooling air guiding slits 139 of the plate member 137, it is rational that chips or the like stay in the vicinity of the LED 143b and impede the illumination ability. Can be avoided. Thus, the operator presses the circular saw 101 in the direction of the workpiece W using the hand grip 117 in a state of being clearly illuminated by the LED 143b. Thereby, while the blade 129 cuts the cutting work area H, the circular saw 101 rotates around the tip 105a of the base 105 as a rotation center, and eventually the base 105 comes into surface contact with the workpiece W, and thereafter A normal cutting operation by the blade 129 is performed.

In view of the gist of the present invention and the embodiments described above, the following embodiments can be configured.
(Aspect 1)
“The power tool according to claim 1,
The electric tool is a portable electric cutting tool having a saw blade that is housed in the blade case and performs a predetermined processing operation on a workpiece, and a base that is slidably mounted on the workpiece. Configured,
In the first and second work modes, the angle formed by the line extending from the saw blade center side to the base tip side with respect to the work work surface of the workpiece is configured to be different for each work mode. An electric tool characterized by having "

(Aspect 2)
“The power tool according to aspect 1,
The first and second illuminating portions have light irradiation directions with respect to each other based on a difference in angle formed by a line extending from the saw blade center side to the base tip side with respect to a processing work surface of the workpiece. The first illumination unit illuminates the work area of the workpiece in the first work mode, and the second illumination unit is arranged in the second work mode. An electric power tool set to illuminate a work area of a workpiece. "

(Aspect 3)
“The power tool according to aspect 1 or 2,
The cutting depth of the saw blade with respect to the workpiece is configured to be different for each work mode, and in the state where the cutting depth is deep, the work area of the workpiece is mainly illuminated by the first illumination unit. And in the state where the said cutting depth is shallow, it is comprised so that the work area | region of the said workpiece may be mainly illuminated by the said 2nd illumination part. "

(Aspect 4)
“Electric power tool according to any one of aspects 1 to 3,
The electric power tool characterized in that the first illuminating part and the second illuminating part are arranged in the blade case in a region between the center of the saw blade and the tip of the base. "

It is front sectional drawing which shows the whole structure of the circular saw which concerns on this Embodiment. It is a side view which shows the whole structure of the circular saw which concerns on this Embodiment. In FIG. 2, the blade is indicated by a one-dot chain line. The detailed structure of the plate member used for the circular saw which concerns on this Embodiment is shown. The AA line sectional structure of the plate member in FIG. 3 is shown. It is a figure which shows the state of the plunge cut by the circular saw which concerns on this Embodiment.

101 Circular saw 103 Main body 105 Base 111 Motor housing 113 Blade case 114 Gear housing 115 Safety cover 117 Hand grip 119 Illuminating means switch 121 Drive motor 123 Drive shaft 125 Gear 127 Spindle 129 Blade 131 Cooling fan 133 Cooling air ventilation path 135 Cooling air Discharge port 137 Plate member (cooling air guiding member)
139 Cooling air induction slit (window)
141 Illumination means 143 LED
145 Lead wire F Cooling air guiding direction G Cutting work area H Cutting work area W during plunge cutting Work material

Claims (1)

A work tool that is housed in a blade case and performs a predetermined processing operation on a workpiece;
A drive motor for driving the work tool;
An electric tool having illumination means for illuminating a work area of the workpiece,
The said illumination means has a 1st illumination part which illuminates a normal cutting work area | region, and a 2nd illumination part which illuminates the cutting | disconnection work area | region at the time of performing a plunge cut, The electric tool characterized by the above-mentioned.

Images