JP4498750B2 - Circular saw - Google Patents

Description

  The present invention relates to a technique for treating chips generated when a workpiece is cut in a circular saw.

  Chips generated by cutting a workpiece (especially wood) using a circular saw are carried by the air flow generated by the rotation of the blade (saw blade) that cuts the workpiece, and the upper half of the blade It is discharged from the rear of the blade case through the inside of the blade case covering the region. However, some of the chips protrude forward and accumulate on the upper surface of the base or the upper surface of the workpiece, and cover the black lines drawn on the workpiece. In order to solve such a problem, a technique has been proposed in which cooling air used for cooling the motor is used to blow off chips. For example, Utility Model Registration Publication No. 2543298 (Patent Document 1) discloses a chip processing technique in which the air after cooling the motor is blown obliquely from above toward the cutting point between the saw blade and the workpiece. ing.

In the above disclosed technique, a rib-shaped partition wall is set on the side surface of the blade case, and the air after cooling the motor discharged from the motor housing discharge port is obliquely upward toward the upper surface of the base using the rib-shaped partition wall as a wind guide. The wind blows from. That is, only the technique of blowing air intensively on the upper surface of the base to blow off the chips is disclosed, and no subsequent processing of the chips is taken into consideration. For this reason, there is a high possibility that chips will still accumulate in the cutting area (the upper surface of the workpiece) in front of the base (front in the direction of travel during cutting work). Therefore, although it is effective when cutting the blade tip near the black line in the vicinity of the cutting site, it is effective when cutting the black line guide provided at the tip of the base along the black line. However, there is room for improvement in this respect.
Utility Model Registration Gazette No. 2543298

  In view of the above, an object of the present invention is to provide an improved technique so that chips generated during a cutting operation of a workpiece with a circular saw do not accumulate in a cutting region in front of the cutting direction.

According to the first aspect of the present invention, a circular saw body having a blade for cutting the workpiece and a drive motor for rotationally driving the blade, and connected to the circular saw body and placed on the workpiece. A circular saw that has a possible base and that is cut by the blade is configured by placing the base on the workpiece and moving it in the cutting direction. The cooling air after motor cooling, and is configured to induce the base upper surface in the blade front end region of the through guide path. In the present invention also opens the outlet of the air passage to the opposite shape to the base forward of the cutting area with the base upper surface to set the air passage in front edge angled in cutting direction, it is induced on the base upper surface The cooling air is blown in a straight line toward the front region in the cutting direction through the ventilation path. Furthermore, the ventilation path is constituted by a concave portion extending in the front-rear direction formed on the lower surface of the ink guide for blade position indication arranged on the upper surface of the base, and the cooling air flowing out from the outlet diffuses immediately after the outflow. It is set so that a certain outflow length is secured toward the front .

According to the present invention, the air which has been subjected to the cooling of the drive motor, after induction based on surface of the blade forward through the guide path, ahead of the cutting direction through the air passage which is set the air based on surface In addition, the air can be intensively sprayed toward the cutting area of the workpiece to be cut from the outlet of the ventilation path. By such air flow is formed, among the chips generated during cutting of the workpiece, chips flowing toward the front of the blades are blown away by the wind induced based on surface or the While being carried forward by the wind, it is discharged forward from the outlet through the ventilation path. The wind that flows out from the outlet of the ventilation path is blown from the front end portion of the base toward the cutting area of the workpiece, and blows away the chips. Thereby, the area | region where a chip | tip does not exist can be formed about the fixed area | region in a cutting area | region. As a result, in a certain front region from the base front end, it is avoided that the black line drawn on the workpiece is covered with the chips. That is, according to the present invention, the wind directed toward the front in the traveling direction of the circular saw, which is the cutting direction of the work material, is intensively blown to the cutting region (black line) of the work material, thereby Prevents the accumulation of chips and makes it easier to see the black lines.

In the present invention also circular saw main body portion includes a blade case for housing the blade, within the blade case, the induction path for flowing out the cooling air after the motor cooled to blade forward of the base top surface is set Ru is the configuration. The guide path is a wind rectifying plate that changes the flow direction of the cooling air after cooling the drive motor discharged into the blade case, and the cooling air guided by the wind rectifying plate is passed through the upper surface of the base to the ventilation path. And a nozzle portion for causing the liquid to flow out. In the case of a circular saw, the starter motor is generally arranged so that the rotational axis direction substantially intersects the moving direction during the cutting operation. For this reason, when setting the “guidance path”, after receiving the wind that passes through the motor housing that houses the drive motor and is discharged into the blade case, the direction of the wind is directed to the front ventilation path. It is effective to arrange a passage component member in a mode of conversion and guiding.
According to the present invention, by setting the guide path in the blade case, the outflow direction of the wind that flows out substantially linearly through the guide path and the passage direction of the ventilation path are substantially the same straight line in plan view. Can be set so as to match or be close to each other. As a result, the wind that has flowed out of the guiding path can be efficiently entered into the ventilation path.

In the present invention, the ventilation path is constituted by a concave portion extending in the front-rear direction formed on the lower surface of the black line guide for blade position indication arranged on the upper surface of the base. The “black line guide” means a function having a function as a mark indicating the position of the blade so that the position of the blade matches the black line drawn on the workpiece. According to the present invention, since the wind passes through the bottom surface (concave portion) of the inking line guide, chips are blown out in front of the inking line guide so that the inking line of the workpiece can be easily seen and the inking line is easily aligned. can do.

(Invention of Claim 2 )
According to a second aspect of the present invention, in the circular saw according to the first aspect , a notch having an opening at the front is set at the front end of the base, and the ink guide is covered with the notch from above. It is the arranged configuration. According to such a configuration, the black line guide can be disposed so as to be close to the black line of the workpiece, and the black line alignment can be performed more easily.

  ADVANTAGE OF THE INVENTION According to this invention, the technique improved so that the chip which generate | occur | produces at the time of the cutting | disconnection operation | work of the workpiece by a circular saw did not accumulate in the cutting area in the front of the said cutting direction was provided.

  Hereinafter, a circular saw according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the overall configuration of the circular saw 101 according to the present embodiment as a plan view with a part cut, and FIG. 2 shows the overall configuration of the circular saw 101 as a side view with a part cut. Further, FIG. 3 shows an overall configuration of the circular saw 101 as a front sectional view. 4 is an enlarged view of portion A in FIG. 1, and FIG. 5 is an enlarged view of portion B in FIG. As shown in FIGS. 1 to 3, the circular saw 101 according to the present embodiment is generally capable of tilting about a tilt center 121 a with respect to the base 111 that can be placed on the workpiece and the base 111. And a circular saw body 121 connected to each other. The workpiece is not shown for convenience.

  The circular saw body 121 includes a blade 123, a blade case 125 that covers the upper half of the blade 123, a motor housing 127 that houses a drive motor 131 for rotationally driving the blade 123, and an operator grips the circular saw body 121. A hand grip (handle portion) 129 for holding and advancing the circular saw 101 is mainly used. A safety cover 126 that covers the lower half of the blade 123 is rotatably attached to the blade case 125. The lower edge portion of the blade 123 including the safety cover 126 is protruded to the lower surface side through the opening 111 a formed in the base 111.

  The safety cover 126 is placed on the workpiece to be cut during cutting of the workpiece, that is, the front end (right side in FIG. 2) of the base 111 and moved forward (rightward in FIG. 2). At this time, the front end portion is pushed by the workpiece and retracted and accommodated in the blade case 125. The front-rear direction of the circular saw body 101 corresponds to the “cutting direction” in the present invention. The hand grip 141 is integrally provided above the motor housing 119, and a trigger switch (not shown for convenience) is installed for energizing the drive motor 121.

  Angular plates 113 are erected on the front end portion and the rear end portion of the base 111, respectively. The circular saw body 121 is fixed to the angular plate 113 using the tilt angle adjusting lock screw 115 while rotating around the axial axis of the circular saw body 121 in the longitudinal direction. It is set as the structure corresponding to the cutting operation | work in the state inclined to right and left with respect to the back-and-forth direction, what is called inclination cutting. The circular saw body 121 is configured to have a so-called depth-of-cut adjustment function in which the amount of protrusion of the blade lower edge 123a from the bottom surface of the base 111 is adjusted by tilting up and down around the tilt center 121a. It is said. The circular saw body 101 after adjusting the cutting depth of the blade 123 can be fixed to the base 111 by a locking screw 117 for adjusting the cutting depth.

  As shown in detail in FIGS. 1 and 3, the blade case 125 is connected to the motor housing 127 and also includes a gear housing portion that houses a power transmission mechanism portion 141 for transmitting the rotational output of the drive motor 131 to the blade 123. 125a is integrally provided. The drive motor 131 includes a rotor 131a that is rotatably disposed in the motor housing 127, and a stator 131b that is fixed in the motor housing 127 by fastening means such as a screw 133, and the rotation of the rotor 131a. The axial direction is arranged so as to be perpendicular to the moving direction of the circular saw 101 during the cutting operation. An output shaft 135 of the electric motor 131 extends substantially horizontally and is rotatably supported by bearings 137 at both ends thereof. A drive gear 135a is integrally formed on one end portion side (the gear housing portion 125a side) of the output shaft 137.

  A blade shaft 143 for blade mounting is disposed in the gear housing portion 125a so as to be parallel to the output shaft 135, and is rotatably supported via a bearing 145. A driven gear 147 that rotates integrally with the blade shaft 143 is disposed at one end of the blade shaft 143, and the driven gear 147 meshes with and engages with the drive gear 135a. As a result, the blade 123 mounted on the blade shaft 147 can rotate integrally with the driven gear 133 that is rotationally driven by the drive gear 135a. The drive gear 135a, the driven gear 147, and the blade shaft 143 constitute a power transmission mechanism 141.

  A cooling fan 151 that allows cooling air to flow through the motor housing 105 is attached to the output shaft 135 of the drive motor 131 so as to rotate integrally with the output shaft 135. A centrifugal fan is used as the cooling fan 151, and a baffle plate 153 is disposed on the rear side of the cooling fan 151. A ventilation hole 155 (see FIG. 3) is provided at the center of the baffle plate 153. When the cooling fan 151 is rotated by energization driving of the drive motor 131, the cooling air is sucked from the suction port 157 formed at the end of the motor housing 127 by the suction force of the cooling fan 151. As indicated by an arrow in FIG. 1, it flows through the gap between the rotor 131a and the stator 131b or the gap formed between the stator 131b and the inner wall surface of the housing toward the gear housing portion 125a. Then, the drive motor 131 is cooled. The cooling air passing through the drive motor 131 is discharged to the blade case 125 side through the wind window 159 formed in the gear housing portion 125a while being guided by the baffle plate 153. A plurality of wind windows 159 are arranged at appropriate intervals in the circumferential direction (see FIG. 2).

  In the blade case 125, a guide path 161 for receiving a part of the cooling air that has passed through the wind window 159 and converting the flow direction of the cooling air is formed. The guide path 161 includes a wind rectifying plate 163 arranged to face several wind windows 159 and a nozzle portion 165 integrally connected to the wind rectifying plate 163. The wind rectifying plate 163 is formed in a substantially dish shape in which the peripheral edge of a flat plate is bent into an L shape, and receives the cooling air discharged from the wind window and changes the flow direction to guide it to the nozzle portion 165. It is said. The nozzle portion 165 is formed in a substantially C-shaped cross section, and forms an injection passage that is narrower than the space of the wind rectifying plate 163 by having the open end surface abutting against the inner wall surface of the blade case. The nozzle portion 165 is disposed in an inclined manner so that the outlet faces the base upper surface 111b, and as a result, the cooling air is directed to the base upper surface 111b in the front region of the blade 123 as shown by arrows in FIGS. It is set as the structure discharged | emitted diagonally downward. That is, the nozzle portion 165 guides the cooling air toward the base upper surface 111b in front of the blade so as to flow out in a direction substantially parallel to the cutting direction, and then the ventilation path 171 formed in the front end region of the base upper surface 11b. In order to make it flow in, it is set as the structure which provides directivity.

  The ventilation path 171 is provided to blow the cooling air that has flowed out to the base upper surface 111b in a substantially linear shape further forward than the front end of the base 111, and is a black guide that is detachably disposed at the front end of the base upper surface 111b. 173. The black line guide 173 functions as a mark indicating the position of the blade 123. On the upper surface, the black line guide 173 indicates a notch 173a and a cutting edge pattern indicating the blade position at the time of linear cutting, and a blade position at the time of inclined cutting (for example, 45 degrees) It has a cut 173b and a cutting edge pattern.

  The black line guide 173 is disposed so as to cover the front end region of the base upper surface 111b and is detachably fixed by a fixing screw 175. A concave portion that opens in the front-rear direction is formed on the lower surface side of the black line guide 173, and a cross-sectional shape extending in a cutting direction with a predetermined length between the concave portion and the base upper surface 111b is a substantially rectangular ventilation path 171. Is configured. That is, the inlet of the ventilation path 171 is opened to face the base upper surface 111b so as to accept the entrance of the cooling air flowing out to the base upper surface 111b. Further, the outlet of the ventilation path 171 is opened from the front end of the base 111 so as to face the cutting area ahead. In addition, the ventilation path 171 is arrange | positioned as a whole in the shape of a slightly lower front slope. Therefore, the cooling air blown forward through the ventilation path 171 becomes a straight line substantially parallel to the cutting direction. The extension length of the ventilation path 171 is set so that the cooling air flowing out from the outlet does not diffuse immediately after the outflow and a certain outflow length is secured toward the front. In addition, a substantially U-shaped notch 111c is formed in a front end edge of the base upper surface 111b in a plan view. The ink line guide 173 is arranged so as to cover the notch 111c from above.

Next, the operation and usage method of the circular saw 101 of the present embodiment will be described.
The operator grips the hand grip 129 of the circular saw 101, energizes and drives the drive motor 131 by the pulling operation of the trigger switch to rotate the blade 123, and then the front end of the base 111 on the workpiece to be cut. Is placed and moved forward, the work of cutting the workpiece by the blade 123 is performed.

  As the drive motor 131 is driven, the cooling fan 151 is rotated. The cooling air sucked into the motor housing 127 from the suction port 157 by the rotation of the cooling fan 151 cools the drive motor 131 of the motor housing 127 as shown in FIG. It is discharged into 125. Among the cooling air discharged into the blade case 125, a part of the cooling air is received by the wind rectifying plate 163 and guided to the nozzle portion 165 as shown in FIGS. It flows out from the blade 123 side through the portion 165 toward the base upper surface 111b in front of the blade 123 obliquely from above. The cooling air that has flowed out to the base upper surface 111b further flows forward along the base upper surface, and passes through the ventilation path 171 formed between the black line guide 173 and the base upper surface 111b. It is blown out to the upper surface of the workpiece. Thus, when the drive motor 131 is driven, the wind flow as described above is formed.

  On the other hand, most of the swarf generated during the cutting operation is carried backward through the inside of the blade case 125 by the rotation of the blade 123 and discharged from the rear of the blade case 125. However, a part of the chips flows from the opening 111a of the base 111 to the front upper surface 111b. The chips are conveyed forward by the above-described flow of cooling air, that is, the flow of cooling air blown out to the cutting region through the air passage 171 after flowing out from the nozzle portion 165 to the base upper surface 111b. Thereby, the chips are transported forward without being deposited on the base upper surface 111b, and further discharged through the ventilation path 171 to the cutting area of the workpiece to be forwarded. The cooling air discharged from the ventilation path 171 is blown in a straight line to the front area in the traveling direction in the cutting direction, and therefore, there is an area in which no chips exist for a certain front area from the front end of the base 111. Will be formed.

  As described above, according to the present embodiment, not only the base upper surface 111b that is the front area of the blade 123, but also the fixed area in the cutting area of the workpiece in front of the front end portion of the base 111, the chips It is possible to form a region in which no exists. And the area | region where this chip does not exist is moved ahead sequentially with progress of cutting work. For this reason, when cutting along the black line drawn on the workpiece, the position of the black line can be easily confirmed, and the black line alignment by the black line guide 173 can be easily performed.

  In particular, in the present embodiment, the ventilation path 171 is configured using the black line guide 173, the cooling air is blown forward through the lower surface of the black line guide 173, and the chips are blown forward by the cooling air. Therefore, it is possible to surely prevent the chips from being deposited on the black line by blowing away the chips in front of the black line guide 173. Further, the air passage 171 is configured to blow cooling air substantially straight in the traveling direction and obliquely downward, so that it is reliably blown onto the upper surface of the workpiece. Thereby, the chips on the workpiece can be reliably blown off.

In the present embodiment, a cooling air guiding path 161 is set in the blade case 125, and the cooling air discharged from the motor housing 127 is directed to the ventilation path 171 through the base upper surface 111b in front of the blade. It can be drained in the applied state. For this reason, the cooling air can surely flow out to the cutting area of the workpiece in front of the base 111 through the ventilation path 171, thereby preventing the accumulation of chips in the cutting area.
In the present embodiment, the notch 111c is set at the front end of the base 111, and the ink line guide 173 is disposed above the notch 111c, so that the ink line guide 173 approaches the ink line of the workpiece. In other words, an arrangement in which a black line can be seen immediately below the notch can be easily performed.

  In the present embodiment, the ventilation path 171 is configured using the black line guide 173, but the ventilation path 171 may be configured using a member different from the black line guide 173.

It is a partial cutting top view which shows the whole structure of the circular saw which concerns on a present Example. It is a partially cutaway side view showing the entire structure of the circular saw according to the present embodiment. It is a front sectional view showing the overall structure of the circular saw according to the present embodiment. It is an enlarged view of the A section in FIG. It is an enlarged view of the B section in FIG.

101 Circular saw 111 Base 111a Opening 111b Base upper surface 111c Notch 113 Angular plate 115 Inclination angle adjusting lock screw 117 Cutting depth adjusting lock screw 121 Circular saw body 121a Tilt center 123 Blade 125 Blade case 125a Gear housing 126 Safety cover 127 Motor housing 129 Hand grip 131 Drive motor 131a Rotor 131b Stator 133 Screw 135 Output shaft 135a Drive gear 137 Bearing 141 Power transmission mechanism 143 Blade shaft 145 Bearing 147 Driven gear 151 Cooling fan 153 Baffle plate 155 Ventilation hole 157 Suction port 159 Wind window 161 Guiding path 163 Wind rectifying plate 165 Nozzle portion 171 Ventilation path 173 Ink line guide 173a Cuts and cutting edge design for the previous pattern 173b oblique cutting 175 fastening screws

Claims (2)

A circular saw body having a blade for cutting the workpiece and a drive motor for rotationally driving the blade; a base connected to the circular saw body and capable of being placed on the workpiece; A circular saw that is cut by the blade by placing a base on the workpiece and moving it in the cutting direction,
The cooling air after cooling the drive motor is guided to the upper surface of the base in front of the blade through a guide path, and a ventilation path extending in a downwardly inclined manner in the cutting direction is set on the upper surface of the base and the ventilation path. The outlet of the base is opened to face the cutting area in front of the base , and the cooling air guided to the upper surface of the base is blown in a straight line toward the front area in the cutting direction through the ventilation path,
The ventilation path is constituted by a recess extending in the front-rear direction formed on the lower surface of the ink guide for blade position indication arranged on the upper surface of the base, and the cooling air flowing out from the outlet diffuses immediately after the outflow. Is set to ensure a certain outflow length toward the front ,
The circular saw body includes a blade case that accommodates the blade, and the guide path is provided in the blade case for flowing the cooling air after cooling the motor to the upper surface of the base in front of the blade. The guide path is a wind rectifying plate that changes the flow direction of the cooling air after cooling the drive motor discharged into the blade case, and the cooling air guided by the wind rectifying plate is passed through the upper surface of the base to the ventilation path. A circular saw characterized by comprising a nozzle portion for flowing out . The circular saw according to claim 1,
A circular saw having a notch extending rearward at a predetermined length at a front end portion of the base, and the black line guide is mounted so as to cover the notch from above.

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