JP2006224684A - Cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure handiness in use and a dust collection function with miniaturization of the main body maintained while making the cutting position certainly viewable. <P>SOLUTION: A dust cover 25 is set on a blade case 10. In the dust cover 25, a dust collection passage 31 partitioned from a saw blade 4 is formed, and a blow-out opening is formed on the rear side in the cutting direction in the blade case 10. In the circumferential part 26 of the blade case 10 positioned below the dust collection passage 31, an admission port 27 introducing an air flow produced by the rotation of the saw blade 4 from the front side in the cutting direction into the dust collection passage 31 and an auxiliary inlet 28 are formed. By a duct installed between the opening of the blade case 10 and the connection opening 41 of the dust cover 25, a branch plate installed in the opening position of the connection opening 41 and a nozzle part 46 that opens downward in the underside position of the branch plate, the cooling air for the motor is made possible to be exhausted to the nose of the base. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutter such as a cutter or a marnoco for cutting a material to be cut with a disk-shaped cutting blade.

For example, in Marunoco, a main body provided with a disk-shaped saw blade (cutting blade) that is rotationally driven by a motor is provided on a flat rectangular base, and the base is placed on the material to be cut by projecting the saw blade below the base. By sliding, the material to be cut can be cut with a saw blade. In Marunoko, the front end of the blade case that covers the upper part of the saw blade is rotatably mounted on the base, while the rear end of the blade case is along an arcuate depth guide that stands on the base. In addition, it can be fixed at an arbitrary position, and by changing the fixing position with respect to the depth guide, the protrusion amount (cut amount) of the saw blade from the base can be adjusted.
In such a marnoco, the chips generated from the material to be cut at the time of cutting are scattered, making it difficult to see the black lines on the material to be cut, which makes the working environment worse. Therefore, as disclosed in, for example, Patent Documents 1 and 2, in the blade case covering the upper part of the saw blade in the main body, the chips are guided rearward along the peripheral edge of the saw blade, and provided behind the blade case. A technique for preventing dust from being scattered by forming a dust collecting passage to be discharged from the discharge port is employed.

Japanese Utility Model Publication No. 5-5332 JP-A-11-58305

  Providing such a dust collection passage makes it easier for chips to be clogged in the dust collection passage. Therefore, it is necessary to ensure a large dust collection passage to prevent clogging of the chips. For this reason, a blade case becomes large, the compactness of a main body is inhibited, and usability worsens. In addition, in the case of having a depth guide for adjusting the depth of cut, if the depth guide is provided outside the blade case, irregularities increase on the outside and the appearance is impaired, so it is often housed inside the blade case. . Therefore, the air flow by the saw blade interferes with the depth guide to cause turbulence, leading to a decrease in the dust collection function. Moreover, since the chips adhere to the depth guide, there is a problem that the chips are spilled when the depth of cut is adjusted.

  Accordingly, an object of the present invention is to provide a cutting machine that can ensure a good usability and a dust collecting function while maintaining the compactness of the main body while making the cutting position surely visible. is there.

In order to achieve the above object, according to the first aspect of the present invention, a dust collection passage that is partitioned from the cutting blade is formed in the upper portion of the blade case along the periphery of the cutting blade, and the cutting blade and the dust collection passage are formed. And an entrance through which the air flow generated by the rotation of the cutting blade can enter the dust collecting passage from the front side in the cutting direction of the cutting blade, and the rear side in the cutting direction of the dust collecting passage in the dust collecting passage. While the air outlet is formed to discharge air from the side of the main body to the outside, the main body is provided with discharge means for discharging the motor cooling air toward the front end in the cutting direction of the base. is there.
The invention according to claim 2 is the invention according to claim 1, wherein the dust collecting passage is formed by a cover member that is detachably attached to the blade case.
The invention according to claim 3 is the invention according to claim 2, wherein the cover member is a cylindrical body.
The invention according to claim 4 is the invention according to claim 2 or 3, wherein the air outlet is provided in the cover member.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to collect dust effectively, without using a dust collection channel | path, and scattering chips. Therefore, the dust collection passage can be formed small, and it is possible to maintain good usability while maintaining the compactness of the main body. In addition, even when there is a depth guide for adjusting the depth of cut, the depth guide can be accommodated in the blade case separately from the dust collection passage, so that the depth guide does not affect the dust collection function. Further, the use of the discharging means makes it possible to visually recognize the cutting position by rationally using the cooling air, thereby improving usability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a Marunoko as an example of a cutting machine, FIG. 2 is a horizontal sectional view, and the Marunoko 1 shown here is a disc-like shape that becomes a cutting blade that is rotationally driven by a motor 5 on a flat base 2 The main body 3 provided with the saw blade 4 is installed. The main body 3 is formed of a motor housing 7 that houses a motor 5, a handle housing 9 that is connected to the motor housing 7 and forms a handle 11 together with the motor housing 7, and a blade case 10 that covers the upper portion of the saw blade 4. Is done. The saw blade 4 is pivotally supported in the blade case 10 in parallel with the output shaft 6 of the motor 5, and is orthogonally connected to the tip of the spindle 8 rotatively transmitted from the output shaft 6. Reference numeral 12 denotes a trigger switch provided on the handle 11.

  The blade case 10 has a front side (right side in FIG. 2) in the cutting direction of the base 2 that is pivotally attached to a planar U-shaped coupling plate 13 so as to be vertically rotatable by a shaft 14. A fan-shaped guide plate 15 standing on the base 2 and having an arcuate guide groove 16 is connected by a knob screw 17 so as to be fixed at any position along the guide groove 16. On the other hand, on the rear side of the blade case 10, as shown in FIG. 3, a fan-shaped guide plate 18 standing on the base 2 and having an arc-shaped guide groove 19 (FIG. 7) has an arc shape toward the front. A depth guide 21 that curves in a straight line is connected by a knob screw 20 so as to be fixed at an arbitrary position along the guide groove 19. The depth guide 21 is loosely inserted into the blade case 10 and is connected to a bolt 23 that can be arbitrarily clamped by a cam lever 22 through the blade case 10.

  Therefore, the main body 3 is rotated around the shaft 14 by changing the clamping position of the blade case 10 along the depth guide 21, and the amount of protrusion (cutting amount) of the saw blade 4 below the base 2 is increased. Adjustable. Further, by changing the fixing position of the connecting plate 13 and the depth guide 21 in the front and rear guide plates 15 and 18, the main body 3 is lowered to the right side from the right angle position where the saw blade 4 is orthogonal to the base 2 and sawed. The blade 4 can be fixed at an arbitrary inclination angle up to the maximum inclination position where the blade 4 is inclined at an angle of 45 ° with the base 2. The front end of the base 2 is formed with cuts 24, 24 whose side edges are positioned on the extended surface of the saw blade 4 at a right angle position and 45 ° position of the saw blade 4, respectively. By aligning the side edges of the incisions 24 and 24 with the marked black line, cutting along the black line can be easily performed.

  Also, as shown in FIGS. 4 to 6, the blade case 10 has an inverted U-shaped cross section as a cover member extending from the vicinity of the front shaft attachment portion to the rear side along the periphery of the saw blade 4. The dust cover 25 is attached with screws. In the peripheral surface portion 26 of the blade case 10, which is a partition portion between the dust cover 25 and the saw blade 4, as shown in FIG. Auxiliary inlets 28 are formed at positions substantially above the center, respectively, so that the blade case 10 communicates with the dust cover 25. Further, a connecting portion 29 that is continuous with the rear edge of the dust cover 25 is formed on the rear side of the blade case 10, and an air outlet 30 is formed in the connecting portion 29. Therefore, wind generated in a tangential direction on the front side of the saw blade 4 enters the dust cover 25 through the advance inlet 27 and the auxiliary inlet 28 and enters the dust cover 25 as it is in the dust cover 25. A dust collecting passage 31 that moves rearward along the circumferential direction and is discharged from the blower outlet 30 to the front side is formed.

  A safety cover 32 is provided in the blade case 10 so as to be rotatable concentrically with the saw blade 4 and normally covers a lower portion of the saw blade 4 except for a front portion of the saw blade 4 on the lower side of the base 2. 4 is rotated and biased to the position of FIG. 4, and is rotated in a direction to open the saw blade 4 by contact with the material to be cut, and is accommodated in the blade case 10 inside the peripheral surface portion 26 of the blade case 10. The

As shown in FIGS. 6 to 8, a pair of ribs 33, 33 parallel to the saw blade 4 are formed in the entrance 27 of the blade case 10 at approximately left-right symmetrical positions around the saw blade 4. . The ribs 33, the edge of the saw blade 4 side has a long first inclined portion 34 that approaches the center side of the saw blade 4 as it goes upward, and the saw blade as it goes upward from the end of the first inclined portion 34. 4 is formed in the shape of a dogleg consisting of a short second inclined portion 35 that is far from the center of 4, and the end of the first inclined portion 34 protrudes toward the saw blade 4 side so as to overlap the saw blade 4 in the left-right direction. .
Further, the auxiliary inlet 28 is positioned slightly forward of the tip position of the depth guide 21 by the maximum protrusion amount of the saw blade 4 and is not blocked by the depth guide 21. Further, the rear side of the auxiliary inlet 28 in the peripheral surface portion 26 is an inclined portion 45 that approaches the saw blade 4 as it goes forward.

  On the other hand, in the motor housing 7, a fan 36 for cooling the motor 5 is provided on the output shaft 6 of the motor 5, and an intake port 37 provided at the end of the motor housing 7 as the output shaft 6 rotates. , 37... Can take in cooling air for the motor 5. A dish-shaped baffle plate 38 having an opening at the center is provided on the air introduction side of the fan 36, and the cooling air that has passed through the motor housing 7 is guided to the blade case 10 and opened into the blade case 10. It is possible to discharge from a plurality of exhaust ports 39, 39.

  Further, in the blade case 10, an opening 40 is formed in front of the side surface of the cylindrical portion connected to the motor housing 7, and a connection port 41 is formed in the dust cover 25 on the side surface of the motor housing 7. A semi-cylindrical duct 42 that connects the opening 40 and the connection port 41 is attached to the outer surfaces of the blade case 10 and the dust cover 25, and cooling air is supplied from the opening 40 along the outer surface of the blade case 10. A guide path 43 leading to 41 is formed. As described above, since a part of the cylindrical inner wall of the duct 42 is also used as the outer wall of the blade case 10, the structure is not wasteful and the protruding portion can be reduced, and the operator can use the vicinity of the notch 24 in the base 2. The view is not obstructed when watching.

However, a horizontal branch plate 44 is formed on the peripheral surface portion 26 of the blade case 10 at the opening position of the connection port 41 so as to partition the connection port 41 up and down, and the cooling plate guided from the guide path 43 into the dust cover 25. Air can be branched up and down the branch plate 44. On the other hand, in the dust cover 25, a cylindrical nozzle portion 46 opening downward is projected forward from a position below the branch plate 44.
Therefore, here, there is a discharge means for guiding the cooling air of the motor 5 from the opening 40 to the connection port 41 through the duct 42 and discharging the air from the lower side of the branch plate 44 toward the front end of the base 2 through the nozzle portion 46. Will be formed.

In the Marunoco 1 configured as described above, when the trigger switch 12 is pushed and the motor 5 is driven with the base 2 set on the material to be cut, the spindle 8 rotates and the saw blade 4 is moved in FIG. Rotate in the counterclockwise direction. Therefore, if the base 2 is slid forward, the material to be cut by the saw blade 4 can be cut.
Chips generated at the front end of the saw blade 4 at the time of cutting are substantially upward along the tangential direction of the saw blade 4 in the blade case 10 by the urging force by the rotation of the saw blade 4 and the wind generated by the rotation. As shown by the arrow in FIG. 6, it enters the dust cover 25 through the entrance 27 provided in the peripheral surface portion 26, moves backward through the dust collecting passage 31, The air is discharged from the outlet 30 to the side as it is. Further, the chips that have not passed through the entrance 27 move backward in the blade case 10 along the peripheral edge of the saw blade 4, enter the dust cover 25 from the auxiliary entrance 28, and join the dust collection passage 31. .

  In the case where the material to be cut is wood, when cutting along the grain or when the sharpness of the saw blade 4 is lowered, the chips may be long in the form of yarn. However, since the thread-like chips are easily caught by the first inclined portions 34 and 34 of the ribs 33 and 33 when passing through the entrance 27, they are directly applied to the first inclined portions 34 and 34 by the wind of the saw blade 4. Along with approaching the saw blade 4 side, the saw blade 4 is touched and cut, and enters the dust collecting passage 31 with a smaller size. Alternatively, the thread-like chips are caught by the saw blade 4 and do not enter the dust collection passage 31 and are discharged through the saw blade 4 side of the peripheral surface portion 26. Therefore, there is no possibility of clogging in the dust cover 25 even if thread-like chips are generated. Moreover, the rectification | straightening effect | action of the wind which passes the entrance 27 is obtained by the ribs 33 and 33 parallel to the saw blade 4. FIG.

  On the other hand, a part of the cooling air taken into the motor housing 7 by the fan 36 with the rotation of the motor 5 is discharged from the exhaust port 39 into the blade case 10 as shown by arrows in FIG. A part is guided from the opening 40 through the guide path 43 in the duct 42 into the dust cover 25 through the connection port 41. Here, the air branched above the branch plate 44 merges with the wind from the saw blade 4 entering from the entrance 27 as it is, as shown by an arrow in FIG. The air branched below the branch plate 44 exits from the front end of the dust cover 25 and is discharged from the nozzle portion 46 toward the front end of the base 2. The air blown downward blows off chips in the cut 24 or on the black line, so that the cutting position can be clearly recognized. In particular, here, since the air blowing is started almost simultaneously with the rotation of the motor 5, the action of preventing the cutting 24 itself and the accumulation of the chips on the black line can be obtained.

  As described above, according to the marnoco 1 of the above embodiment, the dust collection passage 31 that is partitioned from the saw blade 4 is formed in the upper portion of the blade case 10 along the peripheral edge of the saw blade 4, and the peripheral surface portion 26 of the blade case 10. In addition, the inlet 27 through which the airflow generated by the rotation of the saw blade 4 can enter the dust collection passage 31 from the front side in the cutting direction of the saw blade 4 is disposed on the rear side in the cutting direction of the dust collection passage 31. Discharge means for forming air outlets 30 through which the air inside is discharged from the side of the main body 3 to the outside, while discharging cooling air for the motor 5 by the fan 36 toward the front end in the cutting direction of the base 2. By providing the first, the dust collection passage 31 can be used to effectively collect dust without scattering chips. Particularly, in the dust collection passage 31, chips are discharged using the cooling air of the motor 5 in addition to the wind from the saw blade 4, so that clogging of the chips in the dust collection passage 31 can be effectively prevented. . Therefore, the dust cover 25 and the dust collecting passage 31 can be formed small, and it is possible to maintain good usability while maintaining the compactness of the main body 3. Moreover, since the depth guide 21 can be accommodated in the blade case 10 separately from the dust collection passage 31, the depth guide 21 does not affect the dust collection function. Further, by providing the discharge means, the cutting position can be surely visually recognized by rationally using the cooling air, and the usability is improved.

Further, by providing an auxiliary inlet 28 that allows the blade case 10 and the dust collecting passage 31 to communicate with each other on the downstream side of the inlet 27 in the peripheral surface portion 26 of the blade case 10, wind generated by the cutting blade in the blade case 10 is collected. By putting it in the middle of the dust passage 31, the flow of air in the dust collection passage 31 can be improved, and the dust that has not passed through the entrance 27 is captured by the auxiliary inlet 28 on the downstream side and collected. 31 and the dust collection efficiency is improved.
In the entrance 27, there is a first inclined portion 34 that approaches the saw blade 4 as the end edge on the saw blade 4 side goes downstream, and the end edge is orthogonal to the saw blade 4 in the direction orthogonal to the saw blade 4. By providing the ribs 33, 33 that overlap with the saw blade 4, the thread-like chips can be cut into small pieces and guided to the dust collecting passage 31, which is effective in preventing clogging of the chips.

In addition, the blower outlet may not be a simple opening but may be formed in a cylindrical shape so that the hose of the dust collector can be connected. Of course, the shape of the dust cover is not limited to the U-shape, and may be connected to the blade case as a cylindrical body.
Furthermore, the dust collection passage is formed by a dust cover separate from the blade case. Instead of the dust cover, a partition wall along the periphery of the saw blade is provided in the blade case, so that the blade case A dust collection passage may be defined inside.

On the other hand, the entrance may be made longer in the circumferential direction of the cutting blade to ensure a wide opening area. Therefore, if sufficient dust collection is possible at the entrance, the auxiliary entrance can be omitted.
Further, the number of ribs in the entrance may be one, or three or more. Furthermore, it is not limited to being provided in parallel with the cutting blade, for example, an inclination that approaches the cutting blade as it goes downstream may be provided, or ribs that are orthogonal to the cutting blade may be provided in parallel to the tangential direction of the cutting blade. . Of course, these ribs can also be provided at the auxiliary inlet.

  The discharging means is not limited to the structure of the guide path formed on the outer surface side of the blade case by the duct as in the above embodiment, and if there is a space in the blade case, it is formed by a rib or partition wall inside the blade case. It is also possible to directly connect to the dust collecting passage with a cylindrical duct from the motor housing side. The cooling air can also be taken out from the outer periphery of the fan, and the merging position with the dust collecting passage is not only upstream from the entrance, but also coincides with the entrance, or is downstream from the entrance. Can also be selected. However, if it is upstream from the entrance as in the above embodiment, the cooling air can be smoothly merged with the wind blown from the entrance, so that suitable prevention of clogging of chips can be expected over the entire dust collection passage. .

Therefore, the design of the branch plate is not limited to the above-described form, and it is possible to change the design such as a bifurcated path using a cylinder or a rib according to the form of the duct or guide path. The side may be halved, or the dust collection passage side may be increased or vice versa. Moreover, the change of replacing the nozzle part of a dust cover with a simple through-hole etc. can also be performed.
In addition, the present invention is not limited to Marunoko, and can be applied to other cutting machines such as cutters. Of course, inclined cutting is not essential, and the present invention can be applied not only to an AC machine but also to a DC machine using a battery pack mounted as a power source.

It is a perspective view of Marunoko. It is a horizontal sectional view of Marunoko in the central part of a saw blade. It is a rear view of Marunoko (state which removed the duct). It is a front view of the main body which abbreviate | omitted the base. It is a top view of the main body which abbreviate | omitted the base. It is AA sectional view. (A) is a perspective view of the Marunoko from which the dust cover and the motor housing have been removed, and (b) is a perspective view of the Marunoko from which the duct has been further removed. It is the perspective view which looked at the blade case part from the lower part.

Explanation of symbols

1. Marunoko, 2. Base, 3. Main body, 4. Saw blade, 5. Motor, 7. Motor housing, 10. Blade case, 21. Depth guide, 25. Dust cover, 26. Circumference, 27. Entrance 28, auxiliary inlet, 30 air outlet, 31 dust collecting passage, 33 rib, 40 opening, 41 connection port, 42 duct, 43 guideway, 44 branch plate, 46 nozzle part.

Claims (4)

Provided on a flat rectangular base is a main body including a disc-shaped cutting blade that is rotationally driven by a motor and a blade case that covers an upper portion of the cutting blade, and the front side of the blade case in the cutting direction is the base. The blade case is pivotably mounted in the vertical direction, and the blade case rear side in the cutting direction can be loosely inserted into an arcuate depth guide standing on the base and fixed at any position along the depth guide. The blade case is provided with a safety cover that can be rotated concentrically with the cutting blade and is housed inside the blade case during operation,
The motor output shaft is provided with a fan for cooling the motor, and the rotation of the fan accompanying the rotation of the output shaft enables cooling of the motor by taking in cooling air from outside the main body, and A cutting machine for discharging cooling air that has cooled the motor into the blade case,
A dust collection passage that is partitioned from the cutting blade is formed at an upper portion of the blade case along a peripheral edge of the cutting blade, and is generated by rotation of the cutting blade at a partition between the cutting blade and the dust collection passage. An inlet that allows air flow to enter the dust collection passage from the cutting direction front side of the cutting blade to the rear side in the cutting direction of the dust collection passage, and air in the dust collection passage from the side of the main body to the outside A cutting machine characterized in that a discharge means for discharging the cooling air for the motor toward the front end in the cutting direction of the base is provided in the main body while forming outlets to be discharged into the body.   The cutting machine according to claim 1, wherein the dust collection passage is formed by a cover member that is detachably attached to the blade case.   The cutting machine according to claim 2, wherein the cover member is a cylindrical body. The cutting machine of Claim 2 or 3 which provided the blower outlet in the cover member.

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