JP5485000B2 - Dust collection guide for tabletop cutting machine - Google Patents

Description

  The present invention relates to a dust collection guide for collecting dust such as cutting powder generated by a cutting process in a table-type cutting machine called a slide marno.

A table-type cutting machine (circular saw) includes a table on which a cutting material is placed, and a cutting machine main body supported by a rear portion of the table so as to be tiltable up and down via a main body supporting portion. The cutting machine main body includes a circular rotary blade that rotates using an electric motor as a drive source. The upper side of the rotary blade is covered with a blade case. The lower side of the rotary blade is covered with a movable cover. This movable cover is opened and closed in conjunction with the vertical movement of the cutting machine body. When the cutting machine main body is moved downward, the movable cover is opened in conjunction with this, the lower side of the rotary blade is gradually exposed, and this exposed portion is cut into the cutting material. When the cutting machine body is moved upward, the movable cover is gradually closed by the urging force of a spring, for example, to cover the cutting edge.
The rotary blade is cut in a direction that is displaced from the bottom to the top with respect to the cutting material to be cut. For this reason, the cutting powder generated by cutting is blown upward from the cutting site. When the generated cutting powder is scattered around, the working environment is impaired. Moreover, when the generated cutting powder accumulates on the cutting site, it is difficult to see the smear line or the cutting site, which may hinder the work. For this reason, conventionally, in this type of cutting machine, various devices have been made to collect or remove cutting powder in the vicinity of the cutting site that is generated in the cutting process.
For example, in the following Patent Document 1, the cutting machine body is cut by attaching a U-shaped dust collection guide to the lower part of the blade case so as not to interfere with the cutting material at the lower end position of the cutting machine body. A technique for guiding cutting powder generated at a site to an upper dust nozzle with this dust collection guide is disclosed. This Patent Document 1 discloses a fixed dust collection guide. On the other hand, the dust collection guide disclosed in the following Patent Document 2 is supported by the lower part of the blade case so as to be pivotable up and down, and comes into contact with the upper surface of the cutting material so that there is no gap around the cutting part. By covering, the dust collection efficiency to the upper dust nozzle is further enhanced.
Patent Document 3 below discloses a technique in which a dust collection guide that projects downward from a blade case and guides cutting powder to the dust nozzle side is moved up and down in conjunction with the up and down movement of the cutting machine body.

JP 2006-27104 A Japanese Utility Model Publication No. 3-108401 JP 2008-73920 A

However, it is necessary to further improve the conventional dust collection guide in the following points. Since the dust collection guide disclosed in Patent Document 1 is fixed in a state of projecting to the lower part of the blade case, for example, the projecting dimension of the downward direction is required to avoid interference with other parts such as a fence for positioning a cutting material. There is a limit to increasing the size, and as a result, particularly in the case of a cutting material with a thin plate thickness, the dust collection guide becomes a part away from the cutting part, and it is difficult to always obtain a high dust collecting efficiency.
The dust collection guide disclosed in Patent Document 2 is supported so as to be freely rotatable up and down within a certain angle range, and its lower rotation end position is constant. It was difficult to cope with the displacement of the cutting site accompanying the change in the amount of cut, and hence the change in the cutting material blowing direction, and high dust collection efficiency could not always be obtained.
Although the dust collection guide disclosed in Patent Document 3 is configured to move up and down in conjunction with the up and down movement of the cutting machine body, the moving direction thereof is the direction of escaping upward to avoid interference with the cutting material. That is, it is in a direction away from the cutting site, and as a result, there is a problem that dust collection efficiency is lowered particularly in the case of a cutting material having a thin plate thickness.
An object of the present invention is to further increase the dust collection efficiency of a dust collection guide that moves in conjunction with the vertical movement of a cutting machine body.

Said subject is solved by each following invention.
1st invention is equipped with the cutting machine main body which has the rotary blade which rotates, the table which mounts a cutting material, and the main body support part which supports a cutting machine main body so that a vertical displacement is possible with respect to a table, A cutting machine main body Is a blade case that covers the upper part of the rotary blade, a movable cover that covers the lower part of the rotary blade and that is opened and closed in conjunction with the vertical movement of the cutting machine body, and the blade edge of the rotary blade that is exposed by opening the movable cover And a dust collection guide in a tabletop cutting machine provided with a dust collection guide for guiding cutting powder generated at the cutting site toward a dust nozzle provided in the blade case. The dust collection guide according to the first invention is displaced in a direction projecting downward from the lower part of the blade case as the cutting machine body moves downward, and is displaced in a direction approaching the cutting edge of the rotary blade. It is said that.
According to the first aspect of the present invention , the cutting powder is displaced downward along with the downward movement of the cutting machine body, and approaches the cutting edge of the rotary blade, so that the cutting powder is collected at a portion closer to the cutting portion. As a result, the dust collection efficiency toward the dust nozzle can be further enhanced.
A second invention is the dust collection guide according to the first invention, wherein the dust collection guide can be retracted upward during the downward movement operation or stop of the cutting machine body.
According to the second invention , the cutting blade body can be moved downward and the rotary blade can be cut in a state where the dust collection guide is in contact with the upper surface of the thick cutting material, for example, so The periphery can be more reliably covered with the dust collection guide, and the dust collection efficiency to the dust nozzle can be further enhanced.
3rd invention is a dust collection guide which approaches a rotary blade tool in 1st or 2nd invention with the downward movement operation | movement of a cutting machine main body.
According to the third invention , even when a thin cutting material such as a flooring material is cut and the distance between the cutting portion and the dust nozzle is increased, the dust collection guide approaches the blade edge. As a result, the cutting powder is collected at a position closer to the cutting site, whereby the cutting powder can be guided toward the dust nozzle side more efficiently.
According to a fourth invention, in any one of the first to third inventions, the movable cover is opened in conjunction with the downward movement operation of the cutting machine main body through a link arm interposed between the movable cover and the main body support portion. It is configured to be closed in conjunction with the upward movement. In the fourth aspect of the invention, the link arm is supported such that one end side thereof is pivotable up and down with respect to the main body support portion, the other end side is engaged with the movable cover, and a guide groove portion is provided in the middle in the longitudinal direction. The guide convex portion provided on the blade case is engaged with the blade, and the movable cover is opened and closed by being displaced up and down by the vertical movement operation of the cutting machine body. In the fourth invention, the dust collection guide is provided with a guide wall portion, and the guide wall portion is engaged with the guide convex portion from above to allow the guide convex portion to retreat upward while allowing the guide convex portion to retreat. It is configured to be displaced downward by a downward displacement and to approach the blade edge.
According to the fourth aspect of the present invention , the dust collection guide is displaced by utilizing a part of the mechanism for opening and closing the movable cover with respect to the vertical movement of the cutting machine body. Efficiency can be increased. By appropriately setting the shape of the guide wall portion engaged with the guide convex portion from above, an arbitrary timing and path can be set for the displacement of the dust collection guide.
5th invention is a dust collection guide urged | biased in the direction rotated by a leaf spring in any one of 1st-4th invention.
According to the fifth aspect of the invention , the dust collection guide can be surely displaced downward and brought close to the blade edge, so that reliable dust collection can be performed.
A sixth invention is the dust collection guide according to the fifth invention, wherein the leaf spring has a function of guiding cutting powder to the duct nozzle side.
According to the sixth aspect of the invention , the cutting powder collected by the dust collection guide is reliably guided to the dust nozzle by the leaf spring, thereby realizing more reliable dust collection.
A seventh invention is the dust collection guide according to any one of the first to sixth inventions, wherein the dust collection guide includes a lower auxiliary guide that is supported so as to be pivotable up and down and projects downward when the movable cover is opened.
According to the seventh aspect of the invention , for example, when cutting a thin cutting material such as a flooring material and the guide body is not in contact with the upper surface of the cutting material, the lower auxiliary guide from the guide body. Projecting downwardly and coming into contact with the upper surface of the cutting material, cutting dust is efficiently collected.
In an eighth aspect based on the seventh aspect, the lower auxiliary guide is provided with a retraction guide portion that is slidably brought into contact with the cutting material and retracts the lower auxiliary guide upward as the cutting machine body moves in the cutting material surface direction. A dust collection guide provided.
According to the eighth invention , in the case where the dust collecting guide is equipped with a so-called slide marnoco that enables a longer distance cutting process by sliding the cutting machine body in the surface direction of the cutting material in addition to the vertical movement, The lower auxiliary guide can be smoothly guided to the upper surface side of the cutting material through the retraction guide part when the cutting machine body is moved downward and then slid in the cutting material surface direction to perform cutting processing. Efficient dust collection can be performed by causing the lower auxiliary guide to function while smoothly sliding the cutting machine body.
A ninth invention is supported by any one of the first to eighth inventions so as to be pivotable up and down, and when the dust collecting guide pivots downward, the dust collection guide relatively pivots upward to produce cutting powder. It is a dust collection guide provided with an upper auxiliary guide for guiding to the dust nozzle side.
According to the ninth aspect of the present invention , for example, even when a thin cutting material is cut and the guide main body is greatly lowered, the upper auxiliary guide is rotated upward from the guide main body and stretched. By taking out, a continuous dust collection path is ensured between the guide body and the dust nozzle, and efficient dust collection is performed.

It is a left view of the whole tabletop cutting machine provided with the dust collection guide concerning a 1st embodiment. This figure is shown in a state in which the main body of the cutting machine is located at the top dead center and the slide front end position closest to the front. It is a left view of the whole tabletop cutting machine. This figure is shown in a state in which the main body of the cutting machine is located at the bottom dead center and the slide front end position closest to the front. It is a left view of the whole tabletop cutting machine. This figure is shown in a state in which the main body of the cutting machine is located at the top dead center and the slide front end position closest to the front. In this figure, the rear side of the blade case is shown in a longitudinal section. It is a left view of the whole tabletop cutting machine. This figure is shown in a state in which the main body of the cutting machine is located at the bottom dead center and the slide front end position closest to the front. It is a partially broken top view of the cutting machine main body provided with the dust collection guide which concerns on 1st Embodiment. It is a left view of the whole tabletop cutting machine provided with the dust collection guide concerning a 2nd embodiment. This figure is shown in a state in which the main body of the cutting machine is located at the top dead center and the slide front end position closest to the front. It is a left view of the cutting machine main body provided with the dust collection guide which concerns on 2nd Embodiment. This figure shows a state in which the main body of the cutting machine is moved downward by a slight angle from the top dead center, and as a result, the movable cover is opened a little. It is a left view of the cutting machine main body provided with the dust collection guide which concerns on 2nd Embodiment. This figure is shown in a state in which the main body of the cutting machine is moved down to the bottom dead center and is located at the most forward slide front end position. It is a perspective view of the dust collection guide simple substance of a 2nd embodiment. This figure has shown the state which looked at the left side from the diagonal front side. It is a perspective view of the dust collection guide simple substance of a 2nd embodiment. This figure has shown the state which looked at the right side from the diagonally front side. It is a left view of the whole tabletop cutting machine provided with the dust collection guide of a 3rd embodiment. This figure is shown in a state in which the main body of the cutting machine is located at the bottom dead center and the slide front end position closest to the front. It is a perspective view of the dust collection guide simple substance of a 3rd embodiment. This figure has shown the state which looked at the left side from the diagonal front side.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a tabletop cutting machine 1 including a dust collection guide 40 according to the first embodiment. In this example, as the tabletop cutting machine 1, a so-called slide marno (circular saw) is illustrated. The basic configuration of the tabletop cutting machine 1 is the same as the conventional one, and no particular change is required in this example. Hereinafter, the basic configuration of the tabletop cutting machine 1 will be briefly described.
This tabletop cutting machine 1 includes a table 2 on which a cutting material W is placed, a base 3 that rotatably supports the table 2, a main body support portion 4 provided at the rear portion of the table 2, and a main body support portion 4. A cutting machine main body 10 supported above the table 2 is provided. In FIG. 1, the user is located on the right side of the tabletop cutting machine 1. Hereinafter, with respect to the front-rear direction of the members and configurations, the front side (right side in FIG. 1) viewed from the user is the front side, and the direction in which cutting proceeds (left side in FIG. 1) is the rear side. The user is also used as a reference in the left-right direction. Therefore, in FIG. 5, the upper side is described as the right side, and the lower side is described as the left side.
The table 2 is supported on the base 3 so as to be horizontally rotatable. The rotational position of the table 2 can be changed by loosening the lock knob 2a or releasing the lock lever 2b. By changing the rotational position of the table 2, the cutting material can be cut at various angles in plan view. A positioning fence 5 for positioning the cutting material W in the table surface direction is disposed above the table 2. The positioning fence 5 is attached across the left and right auxiliary table portions 3a and 3a of the base 3 protruding to the left and right sides of the table 2. A slight gap is provided between the positioning fence 5 and the upper surface of the table 2.

The main body support portion 4 provided at the rear portion of the table 2 includes front and rear slide mechanisms 6 and 8 and a left and right tilt mechanism 7 in two stages. The lower side front / rear slide mechanism 6 is mainly composed of a pair of left and right slide bars 6 a, 6 a slidably supported back and forth with respect to the rear part of the table 2. A left / right tilt mechanism 7 is supported at the rear ends of the slide bars 6a, 6a. The left / right tilt mechanism 7 is a tilt support member 7a attached to the rear ends of both slide bars 6a, 6a, and a tilt support coupled to the tilt receiving member 7a via a front / rear rotation shaft (not shown). A member 7b is provided. The tilt position of the tilt support member 7b with respect to the tilt receiving member 7a can be adjusted by loosening the fixing lever 7c. The left / right tilt mechanism 7 includes a positioning mechanism that can accurately and quickly position at a right angle cut position and a left / right 45 ° tilt cut position. Moreover, it can fix also about other arbitrary inclination angles. By tilting the cutting machine main body 10 with the left / right tilt mechanism 7, it is possible to perform an inclined cutting process in which the rotary blade is cut obliquely with respect to the cutting material W.
A main body support arm 7d is provided above the tilting support member 7b so as to extend upward. An upper front / rear slide mechanism 8 is supported on the upper portion of the main body support arm 7d. Similar to the lower-side front / rear slide mechanism 6, the upper-side front / rear slide mechanism 8 is mainly composed of a pair of left and right slide bars 8 a, 8 a. Both slide bars 8a, 8a are supported in parallel to each other and slidable back and forth with respect to a slide support portion 8b provided on the upper portion of the main body support arm 7d. The upper and lower two-stage front and rear slide mechanisms 6 and 8 can slide back and forth in parallel and independently of each other. The rear ends of both slide bars 8a, 8a in the upper side front / rear slide mechanism 8 are coupled to each other via a rear end coupling block 8c. The front end portions of the slide bars 8 a and 8 a are coupled to each other via the main body support bracket 11. The main body support bracket 11 supports a cutting machine main body 10 via a main body support shaft 12 so as to be tiltable up and down. The cutting machine body 10 is urged upward by a spring (not shown). FIG. 1 shows a state in which the cutting machine body 10 is held at the upper standby position by this spring biasing force.
By cutting the cutting machine body 10 downward and cutting the rotary blade 14 into the cutting material W, the cutting material W can be cut. In addition, when the cutting machine body 10 is tilted downward, the cutting machine body 10 is slid rearward along the surface direction of the cutting material W by the upper and lower two-stage slide mechanisms 6, 8, whereby a large cutting material W is obtained. Can be cut.

The cutting machine body 10 includes a body case H. The main body case H is integrally provided with a rear support portion 19, an upper dust nozzle 18, and a front blade case 15. A support portion 19 of the main body case H is rotatably supported by the main body support bracket 11 via the main body support shaft 12. An electric motor 13 is attached to the right side of the main body case H. A circular rotary blade 14 is rotatably supported in a state where the upper portion is covered with a semicircular blade case 15 provided at the front portion of the main body case H. The rotary blade 14 rotates using the electric motor 13 as a drive source. A white arrow 15 c indicating the rotation direction of the rotary blade 14 is displayed on the left side 15 </ b> L of the blade case 15. In FIG. 1, the rotary blade 14 rotates in the clockwise direction.
A handle portion 16 gripped by a user is integrally provided on the right side portion 15R of the main body case H. The handle portion 16 has a loop shape, and a switch lever 17 is provided on the inner peripheral side thereof. When the user pulls the switch lever 17 with the fingertip of the hand holding the handle portion 16, the electric motor 13 is activated and the rotary blade 14 rotates. Further, the user can hold the handle portion 16 and tilt the cutting machine body 10 up and down.
The lower end position (maximum cutting depth) of the cutting machine body 10 is regulated by bringing a stopper bolt 34 provided on the support portion 19 of the case body H into contact with a stopper block 35 provided on the body support bracket 11. The By adjusting the tightening amount of the stopper bolt 34, the lower end position of the cutting machine body 10 can be finely adjusted. In addition to the stopper bolt 34 for cutting, a long stopper bolt 36 for grooving is provided on the front side, and one of the stopper bolts 34, 36 can be switched to function depending on the processing form. Can do.
The dust nozzle 18 provided at the rear portion of the blade case 15 communicates with the inside of the blade case 15. Although not shown, for example, a dust bag (dust collection bag) is attached to the dust nozzle 18. In some cases, a dust collecting hose of the dust collector is connected. Cutting powder or the like wound up in the blade case 15 is collected in a dust bag or the like through the dust nozzle 18.
A lower half circumference portion of the rotary blade 14 protrudes downward from the blade case 15. A lower half circumference portion of the rotary blade 14 protruding downward from the blade case 15 is covered with a movable cover 20. The movable cover 20 is supported by the blade case 15 so as to be vertically rotatable via a support shaft 21. An auxiliary plate 22 is attached to the left side portion 15 </ b> L of the blade case 15 to close the front of the rotary blade 14 near the rotation center. As shown in FIG. 5, the auxiliary plate 22 is supported so as to be pivotable up and down via a support shaft 23, and is between an attachment position that closes the front near the rotation center of the rotary blade 14 and an open position that opens. Is supported movably. The auxiliary plate 22 is fixed at a shielding position by a fixing screw 24. When the fixing screw 24 is loosened, the auxiliary plate 22 rotates downward about the support shaft 23, and can thereby be moved to the open position. By moving the auxiliary plate 22 to the open position, the detachment work of the rotary blade 14 can be easily performed. The movable cover 20 is supported by the auxiliary plate 22 via a support shaft 21 so as to be rotatable up and down.
Although not shown, a torsion spring is interposed between the movable cover 20 and the blade case 15. The movable cover 20 is urged in the closing direction by the torsion spring.

The movable cover 20 is opened and closed in conjunction with the vertical movement operation of the cutting machine body 10 via the link arm 30. The rear end portion of the link arm 30 is supported by the main body support bracket 11 via a support shaft 31. The support shaft 31 is disposed below the main body support shaft 12. The inter-axis distance between the support shaft 31 and the main body support shaft 12 is set to an inter-axis distance necessary for opening and closing the movable cover 20 at an appropriate timing in conjunction with the vertical movement of the cutting machine body 10.
The link arm 30 is supported via the support shaft 31 so as to be rotatable up and down. The link arm 30 extends forward from the support portion 19 of the case body H. The link arm 30 reaches the vicinity of the rotation center of the movable cover 20 along the inner surface side of the left side portion 15L of the blade case 15. An engagement roller 32 is rotatably attached to the front end of the link arm 30. The engagement roller 32 is abutted against an engagement plate portion 20 a provided near the rotation center of the movable cover 20.
A guide groove portion 30a having an upwardly convex arc shape is provided at substantially the center of the link arm 30 in the longitudinal direction. A guide protrusion 33 is inserted into the guide groove 30a. The guide convex portion 33 is provided in a state protruding from the inner surface of the left side portion 15 </ b> L of the blade case 15. By inserting the guide convex portion 33 into the guide groove portion 30a, the vertical tilting motion of the link arm 30 accompanying the vertical motion motion of the cutting machine body 10 is restricted to a constant motion. When the cutting machine body 10 moves downward from the upper standby position (position shown in FIG. 1), the engagement roller 32 of the link arm 30 moves counterclockwise around the support shaft 21 while pushing the engagement plate portion 20a. The movable cover 20 is gradually opened against the spring biasing force. The open state of the movable cover 20 is shown in FIG. Conversely, when the cutting machine body 10 is returned upward from the open state of the movable cover 20 shown in FIG. 2, the engaging roller 32 of the link arm 30 moves around the support shaft 21 in the clockwise direction. It is gradually closed by its own weight and spring biasing force.

When the rotary blade 14 is cut into the cutting material W in a state where the movable cover 20 is opened, the cutting powder is blown upward at the cutting portion C. The cutting powder blown up from the cutting part C flows between the left and right side portions 15L and 15R in the vicinity of the rear portion of the blade case 15, and a lot of the cutting powder is guided to the dust nozzle 18. However, when the gap between the cutting part C and the lower part of the blade case 15 is large, a part of the cutting powder blown up from the cutting part C is not blown into the blade case 15 and collected to the dust nozzle 18. Dust efficiency is reduced. In order to compensate for this, a dust collection guide 40 is provided at the rear of the blade case 15.
The dust collection guide 40 includes left and right dust collection wall portions 41 and 42, a dust collection bottom portion 43 that couples the dust collection wall portions 41 and 42 to each other on the rear side, and a support that extends rearward from the dust collection bottom portion 43. An arm portion 44 is provided. The left and right dust collecting wall portions 41 and 42 are positioned so as to protrude leftward and rightward with respect to the cutting edge of the rotary blade 14, and the dust collecting bottom portion 43 is positioned so as to protrude rearward of the cutting edge. This prevents scattering of cutting powder generated at the cutting site C.
The support arm 44 extends substantially flush from the rear of the left dust collecting wall 41 to the rear. In this embodiment, the rear end portion of the support arm portion 44 is coupled to the main body support bracket 11 via the same support shaft 31 as that of the link arm 30. The dust collection guide 40 is supported by the main body support bracket 11 via the support shaft 31 so as to be tiltable up and down.
On the front side of the left dust collecting wall portion 41, a relief recess 41a is provided in a stepped shape so as to open toward the left side portion 15L of the blade case. An arcuate guide wall 45 is provided along the upper part of the escape recess 41a so as to protrude toward the left side 15L. The guide wall portion 45 is placed on the guide convex portion 33 from above.
Further, as shown in FIGS. 4 and 5, a leaf spring 46 is attached to the dust collection bottom portion 43 of the dust collection guide 40. The leaf spring 46 is attached so as to protrude rearward and obliquely upward from the upper portion of the dust collection bottom portion 43. The leaf spring 46 has a rectangular thin plate shape, and the upper side thereof enters the dust nozzle 18 and is elastically pressed against the bottom of the dust nozzle 18. The dust collection guide 40 is urged by the leaf spring 46 in the direction of rotating downward. For this reason, when the guide projection 33 is displaced downward by the downward movement of the cutting machine body 10, the dust collection guide 40 is moved downward about the support shaft 31 by its own weight and the urging force of the leaf spring 46. Rotate.
On the other hand, the dust collection guide 40 is allowed to rotate upward against the urging force of the leaf spring 46. For this reason, even if the lower part of the dust collection guide 40 contacts the upper surface of the cutting material W during the downward movement of the cutting machine body 10, the cutting machine body 10 can be further moved down as it is.

Further, the dust collection guide 40 is rotated up and down around a different support shaft 31 arranged at a fixed inter-axis distance on the lower side with respect to the main body support shaft 12 which is the rotation center of the cutting machine body 10. Move. Therefore, the dust collection guide 40 urged downward by the leaf spring 46 relatively displaces the guide convex portion 33 along the lower surface of the guide wall portion 45 as the cutting machine body 10 moves downward. As a result of rotating downward with respect to the blade case 15, the left and right dust collecting wall portions 41, 42 protrude from the lower portion of the blade case 15 further downward, It becomes a state closer to the cutting edge. Comparing the upward movement position of the cutting machine body 10 shown in FIG. 3 (storage position of the dust collection guide 40) with the downward movement position of the cutting machine body 10 shown in FIG. In the downward movement position, the overlapping range of the left and right dust collection wall portions 41 and 42 with respect to the rotary blade 14 in a side view is wider than the former upward movement position, so that the dust collection guide 40 is in the removal position. It is clearly understood that the blade edge of the rotary blade 14 is closer.
From this, in a state where the cutting machine main body 10 is moved down and the cutting blade 14 is cut into the cutting material W, the dust collecting guide 40 is brought closer to the cutting portion C, and the cutting generated at the cutting portion C thereby. Powder is efficiently blown up between the left and right dust collecting wall portions 41 and 42 of the dust collecting guide 40.
The leaf spring 46 has a function of urging the dust collection guide 40 downward as described above and guiding cutting powder pulled up between the left and right dust collection wall portions 41 and 42 to the dust nozzle 18 side. Yes. Therefore, the cutting powder blown upward from the cutting portion C and once entered between the dust collecting wall portions 41 and 42 of the dust collecting guide 40 is reliably collected without interruption into the dust nozzle 18 by the leaf spring 46. Be dusted.
When the cutting machine main body 10 is moved upward from the downward movement position shown in FIGS. 2 and 4, the link arm 30 is rotated in a direction to displace the engagement roller 32 at the tip around the support shaft 21 in the rearward direction. As the movable cover 20 is gradually closed and the guide convex portion 33 is moved upward, the dust collection guide 40 is moved upward against the leaf spring 46. Since the rotation center (main body support shaft 12) of the cutting machine body 10 and the rotation center (support shaft 31) of the dust collection guide 40 are different, the dust collection guide 40 is guided along the lower surface of the guide wall 45. By relatively displacing the convex portion 33 to the rear side, the convex portion 33 moves upward with respect to the blade case 15 and is displaced in a direction away from the cutting edge of the rotary blade 14.

As described above, the dust collection guide 40 of the first embodiment rotates in the direction of projecting downward from the blade case 15 with the downward movement of the cutting machine body 10 and approaches the cutting edge of the rotary blade 14. Displace in the direction of For this reason, at the stage of the cutting process, the left and right sides are shielded by the left and right dust collecting wall portions 41 and 42 at a position closer to the cutting site C, and the rear is shielded by the dust collecting bottom portion 43 to more reliably cut the cutting powder. The dust collection guide 40 can be positioned at a position where dust can be collected, and thereby the dust collection efficiency toward the dust nozzle 18 can be further enhanced.
Further, since the dust collection guide 40 moves down in a state in which the dust collection guide is allowed to retreat upward, the cutting machine main body with the dust collection guide 40 in contact with the upper surface of the thick cutting material W, for example, 10 can be moved downward to cut the rotary blade 14 so that the periphery of the cutting portion C can be more reliably covered with the dust collection guide 40, and also in this respect, the dust collection efficiency to the dust nozzle is further enhanced. be able to.
Further, since the dust collecting guide 40 is displaced using the guide convex portion 33 that is a part of the mechanism for opening and closing the movable cover 20 in conjunction with the vertical movement of the cutting machine body 10, the configuration is simplified. Dust collection efficiency can be improved while aiming at.
By appropriately setting the cam shape of the guide wall portion 45 engaged with the guide convex portion 33 from the upper side, the operation timing and path of the dust collection guide 40 can be arbitrarily set. The position of the dust collection guide can be arbitrarily controlled.
Further, since the leaf spring 46 having the function of urging the dust collection guide 40 is also provided with the function of guiding the cut powder to the dust nozzle 18, high dust collection efficiency can be realized with a compact configuration.

Various modifications can be made to the first embodiment described above. For example, instead of the leaf spring 46 that biases the dust collection guide 40 downward, a configuration may be adopted in which the dust collection guide 40 is biased downward by mounting a torsion spring around the support shaft 31. Further, a biasing means such as a spring for biasing the dust collection guide 40 downward may be omitted. Even in this case, since the dust collection guide is rotated downward by its own weight, an equivalent effect can be obtained.
Furthermore, although the guide convex part 33 for making a fixed relative movement with respect to the link arm 30 was illustrated, the configuration of guiding the dust collection guide 40 downward while allowing the retraction upward is exemplified. It is good also as a structure which engages the site | part provided separately from the guide convex part 33 with a guide wall part, and makes the said dust collection guide perform the same operation | movement. Therefore, it is good also as a structure which provides a guide wall part in the right dust collection wall part 42, and engages the guide convex part provided in the right side part 15R side of the blade case 15. FIG.
Moreover, although the structure which rotationally supports the dust collection guide 40 using the support shaft 31 of the link arm 30 was illustrated, the dust collection guide is supported so that it can rotate up and down via the support shaft provided separately from this. It is good also as composition to do.

Furthermore, the tabletop cutting machine 1 provided with the dust collection guide 50 which concerns on 2nd Embodiment is shown by FIGS. 6-8. In the second embodiment, the configuration of the tabletop cutting machine 1 itself excluding the dust collection guide 50 is the same as that of the first embodiment, and therefore, members and configurations that do not need to be changed are not described using the same reference numerals. To do. 9 and 10 show a dust collection guide 50 according to the second embodiment alone.
The dust collection guide 50 according to the second embodiment is different from the first embodiment in that two upper and lower auxiliary guides 52 and 53 are added to a guide body 51 corresponding to the dust collection guide 40 according to the first embodiment. Yes. A support arm portion 54 is provided at the rear portion of the guide main body 51 so as to extend rearward as in the dust collection guide 40 of the first embodiment. The rear portion of the support arm portion 54 is coupled to the main body support bracket 11 via the support shaft 31 as in the first embodiment. The guide main body 51 is supported via the support arm portion 54 so as to be tiltable up and down around the support shaft 31.
The guide main body 51 is a resin molded product and has a U-shape having left and right dust collecting wall portions 51a and 51b and a dust collecting bottom portion 51c as in the dust collecting guide 40 of the first embodiment. A support arm portion 54 is attached to the rear surface of the dust collection bottom portion 51c so as to extend rearward. As shown in FIG. 9, the left dust collecting wall 51a has an escape recess 51g formed in the same manner as in the first embodiment, and a guide that forms an upward arcuate arc shape above the escape recess 51g. A wall 51d is provided. As in the first embodiment, the guide wall 51d is placed on the guide convex portion 33 on the blade case 15 side, and the guide main body 51 can be retracted upward, with the vertical movement of the cutting machine main body 10. And turn up and down.
The upper portions of the left and right dust collecting wall portions 51a and 51b are coupled to each other via a coupling wall portion 51e and fixed at a constant interval.
As shown in FIGS. 9 and 10, stopper edge portions 56 are provided on the left and right dust collecting wall portions 51a and 51b so as to protrude sideways. When the stopper edges 56 and 56 abut against the lower end of the main body case H, the upper moving end position (retracted position) of the guide main body 51 with respect to the main body case H allowed to retreat upward is regulated.
The upper auxiliary guide 52 is supported so as to be able to turn back and forth through an upper guide support shaft 55 supported in the left-right direction along the dust collection bottom 51c of the guide body 51. The upper auxiliary guide 52 is also a resin molded product and has a U-shape having left and right dust collecting wall portions 52a and 52b and a dust collecting bottom portion 52c. The left and right dust collecting wall portions 51a and 51b of the guide main body 51 enter inside the left and right dust collecting wall portions 52a and 52b. The upper auxiliary guide 52 is urged in a direction to rotate backward by a spring 57 described later. For this reason, as shown in FIGS. 6 to 8, the upper side of the upper auxiliary guide 52 always enters the dust nozzle 18 even when the cutting machine main body 10 is located at any rotational position, and the bottom portion thereof. Is held in a pressed state. Therefore, the upper auxiliary guide 52 has a function of guiding the cutting powder into the dust nozzle 18 in the same manner as the leaf spring 46 of the first embodiment.

The lower auxiliary guide 53 is supported by the front portion of the guide body 51. The lower auxiliary guide 53 is also a resin molded product, and has a U shape having left and right dust collecting wall portions 53a and 53b and a dust collecting bottom portion 53c. Lower guide support shafts 53d and 53e are integrally provided at the front portions of the left and right dust collecting wall portions 53a and 53b so as to protrude sideways. The lower guide support shafts 53d and 53e are provided coaxially with each other. The lower auxiliary guide 53 is supported on the front portion of the guide main body 51 through the left and right lower guide support shafts 53d and 53e so as to be vertically rotatable. The lower auxiliary guide 53 is rotated upward as shown in FIG. 6 and stored in the guide main body 51, while the lower auxiliary guide 53 is rotated downward as shown in FIG. 8 and further downward from the lower portion of the guide main body 51. It will be overhanging. As shown in FIG. 10, the right dust collection wall portion 53b is integrally provided with a regulating shaft portion 53f protruding sideways. The restriction shaft portion 53 f enters a restriction groove portion 51 f provided in the dust collecting wall portion 51 b on the right side of the guide main body 51. The restriction groove 51f is formed in an arc shape centering on the lower guide support shaft 53e of the lower auxiliary guide 53. The lower auxiliary guide 53 can be turned up and down with respect to the guide body 51 within an angular range in which the restriction shaft portion 53f can be displaced in the restriction groove portion 51f.
The lower auxiliary guide 53 is also urged by a spring 57 in the direction of protruding downward. As shown in FIG. 10, the spring 57 is formed by bending a linear spring material, and one end 57a of the spring 57 is pressed against the restriction shaft 53f from above. The other end 57 b of the spring 57 is hooked on the right dust collecting wall 52 b of the upper auxiliary guide 52. The spring 57 is hooked from above on the lower guide support shaft 53e that pivotally supports the lower auxiliary guide 53 between the one end portion 57a and the other end portion 57b, and the upper auxiliary guide 52 is pivotally supported. It is hooked on the guide support shaft 55 from below. Further, between the lower guide support shaft 53 e and the upper guide support shaft 55, the spring 57 is hooked from below on the stopper edge portion 56 provided on the dust collecting wall portion 51 b on the right side of the guide main body 51. ing. Thus, the upper auxiliary guide 52 is urged in the direction of rotating backward, and the lower auxiliary guide 53 is urged in the direction of projecting downward by the single spring 57 hooked on each part.

When the lower auxiliary guide 53 protrudes further downward from the lower portion of the guide body 51, for example, when cutting a thin cutting material W such as a flooring material as shown in FIG. Even when a gap is generated between the material W, the lower auxiliary guide 53 protrudes downward from the guide body 51 and comes into contact with the upper surface of the cutting material W so that the gap is shielded. It is possible to reliably collect dust by preventing scattering of cutting powder generated at the site C.
The cutting powder collected by the lower auxiliary guide 53 is blown up into the upper auxiliary guide 52 through the guide body 51. The upper auxiliary guide 52 is urged in the direction of rotating backward by a spring 57, and the upper part thereof is always in the dust nozzle 18 and pressed against the bottom part thereof. For this reason, the cutting powder blown into the guide main body 51 is surely collected in the dust nozzle 18 through the upper auxiliary guide 52.
Thus, according to the dust collection guide 50 of the second embodiment, the guide body 51 and the upper and lower auxiliary guides in the dust collection path from the cutting site C to the dust nozzle 18 regardless of the rotational position of the cutting machine body 10. 52 and 53 are formed with almost no gap, and particularly when cutting a thin cutting material W, the cutting powder generated at the cutting site C is reliably and efficiently collected and guided to the dust nozzle 18. Thus, the dust collection efficiency of the cutting machine 1 can be further increased.
When the cutter main body 10 is returned upward, the dust collection guide 50 is stored from the state shown in FIG. 8 to the state shown in FIG. That is, as described in the first embodiment, when the cutting machine main body 10 is returned upward, the guard main body 51 is returned upward so as to be lifted by the upward displacement of the guide convex portion 33. Further, along with this, the movable cover 20 is closed by the relative displacement of the link arm 30. When the movable cover 20 is closed, the lower auxiliary guard 53 is rotated upward with respect to the guard body 51 against the urging force of the spring 57 by being pushed from below by the closing side end portion 20b. It is stored in the main body 51. The left and right dust collecting wall portions 53a and 53b of the lower auxiliary guard 53 are stored along the inner surface sides of the left and right dust collecting wall portions 51a and 51b of the guard body 51, respectively.
Further, when the guard body 51 is rotated upward and returned into the blade case 15, the upper auxiliary guard 52 is relatively stored in the guard body 51 against the urging force of the spring 57. The left and right dust collecting wall portions 52a and 52b of the upper auxiliary guard 52 are stored along the outside of the left and right dust collecting wall portions 51a and 51b of the guard body 51, respectively.

FIG. 11 shows the tabletop cutting machine 1 including the dust collection guide 60 of the third embodiment, and FIG. 12 shows the dust collection guide 60 alone. The dust collection guide 60 of the third embodiment is different from the dust collection guide 50 of the second embodiment in that the lower auxiliary guide 53 includes a retraction guide portion 61. The same members and configurations as those of the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The retraction guide part 61 is a rear end part of the lower auxiliary guide 53 and extends rearward from a lower end part of the dust collection bottom part 53c. The retraction guide portion 61 is integrally formed with the lower auxiliary guide 53 that is a resin molded product. The retraction guide part 61 has a circular arc shape (upward-slip shape) that is gently curved in a downwardly convex direction. On the upper surface of the retraction guide portion 61, a rib 61a for maintaining an arc shape is integrally formed over the entire length.
The retraction guide portion 61 avoids interference between the lower auxiliary guide 53 and the front end of the cutting material W when the cutting machine body 10 is tilted downward and then slid rearward along the surface direction of the cutting material W. Thus, the lower auxiliary guide 53 has a function of smoothly rotating upward to shift to the upper surface of the cutting material W. That is, as shown in FIG. 11, the cutting machine main body 10 is moved downward to the front slide end position at the bottom dead center and the user slides the cutting main body 10 in the cutting progress direction (rearward) from the bottom dead center. First, the retraction guide portion 61 comes into contact with the front end of the cutting material W.
As the retraction guide 61 is slidably contacted with the cutting material W as the cutting machine body 10 slides backward, the lower auxiliary guide 53 gradually turns upward about the support shafts 53d and 53e, Finally, the lower auxiliary guide 53 rides on the upper surface of the cutting material W. When the lower auxiliary guide 53 is in contact with the upper surface of the cutting material W, the cutting machine main body 10 is slid rearward and the cutting process proceeds, so that the cutting powder generated at the cutting site C is removed from the lower auxiliary guide 53 and the guide. The dust is efficiently collected in the dust collection guide 18 through the main body 51 and the upper auxiliary guide 52.
As described above, according to the dust collection guide 60 of the third embodiment, when the cutting machine body 10 is moved downward and then slid backward to perform the cutting process, the lower auxiliary guide 53 is initially the cutting material W. Even if it is in a state of being detached from the upper surface, the lower auxiliary guide 53 is automatically and smoothly cut without requiring the user's manual operation by the sliding contact action of the retraction guide portion 61 accompanying the slide of the cutting machine body 10. It can be put on the upper surface from the front of the material W, and in this respect, the operability (usability) of the dust collecting guide 60 and the tabletop cutting machine 1 can be improved.

W ... Cutting material C ... Cutting part 1 ... Tabletop cutting machine 2 ... Table, 2a ... Lock knob, 2b ... Lock lever 3 ... Base, 3a ... Auxiliary table part 4 ... Body support part 5 ... Positioning fence 6 ... Front / rear slide mechanism (lower stage) Side), 6a ... slide bar 7 ... left / right tilt mechanism 7a ... tilt receiving member, 7b ... tilt support member, 7c ... fixed lever, 7d ... main body support arm 8 ... front / rear slide mechanism (upper side)
8a ... Slide bar, 8b ... Slide support part, 8c ... Rear end coupling block 10 ... Cutting machine body 11 ... Body support bracket 12 ... Body support shaft H ... Body case 13 ... Electric motor 14 ... Rotary blade 15 ... Blade case, 15L ... Left side, 15R ... Right side, 15c ... Arrow 16 ... Handle part 17 ... Switch lever 18 ... Dust nozzle 19 ... Supporting part 20 ... Movable cover, 20a ... Engagement plate part, 20b ... Close side end part 21 ... Support shaft 22 ... Auxiliary plate 23 ... support shaft 24 ... fixing screw 30 ... link arm, 30a ... guide groove 31 ... support shaft 32 ... engagement roller 33 ... guide projection 34 ... stopper bolt 35 ... stopper block 40 ... dust collection guide (first Embodiment)
41 ... dust collection wall (left side), 41a ... escape recess 42 ... dust collection wall (right side)
43 ... dust collecting bottom 44 ... support arm 45 ... guide wall 46 ... leaf spring 50 ... dust collecting guide (second embodiment)
51 ... Guide body 51a ... Dust collecting wall part (left side) 51b ... Dust collecting wall part (right side), 51c ... Dust collecting bottom part 51d ... Guide wall part, 51e ... Coupling wall part, 51f ... Regulating groove part, 51g ... Escape recessed part 52 ... Upper auxiliary guide 52a ... Dust collection wall (left side), 52b ... Dust collection wall (right side), 52c ... Dust collection bottom 53 ... Lower auxiliary guide 53a ... Dust collection wall (left side), 53b ... Dust collection wall (Right side), 53c ... dust collection bottom 53d ... guide support shaft (left side), 53e ... guide support shaft (right side), 53f ... restriction shaft portion 54 ... support arm portion 55 ... upper guide support shaft 56 ... stopper edge 57 ... Spring, 57a ... one end, 57b ... other end 60 ... dust collection guide (third embodiment)
61 ... Retraction guide part, 61a ... Rib

Claims (9)

A cutting machine main body having a rotating rotary blade, a table on which a cutting material is placed, and a main body support portion that supports the cutting machine main body so that the cutting machine main body can be displaced vertically.
The cutting machine body includes a blade case that covers the upper part of the rotary cutting tool, a movable cover that covers the lower part of the rotary cutting tool, and is opened and closed in conjunction with the up and down movement of the cutting machine body, and by opening the movable cover The dust collection guide in the tabletop cutting machine provided with a dust collection guide that covers the cutting edge of the exposed rotary blade and guides the cutting powder generated at the cutting site toward the dust nozzle provided in the blade case,
Said cutting machine in accordance with the downward operation of the main body from a lower portion of the blade case in a direction projecting downward, you displaced relative to the blade case dust guide. The dust collection guide according to claim 1, wherein the dust collection guide is retractable upward during a downward movement operation or stop of the cutting machine body. 3. The dust collection guide according to claim 1, wherein the dust collection guide approaches the rotary blade with a downward movement of the cutting machine body. It is a dust collection guide given in any 1 paragraph of Claims 1-3,
The movable cover is opened in conjunction with the downward movement operation of the cutting machine main body through a link arm interposed between the movable body support portion and the movable cover, and is closed in conjunction with the upward movement operation.
One end side of the link arm is supported so as to be pivotable up and down with respect to the main body support portion, the other end side is engaged with the movable cover, and a guide groove portion is provided at a midway portion in the longitudinal direction. The guide convex portion provided on the blade case is engaged, and is configured to open and close the movable cover by vertically moving by the vertical movement operation of the cutting machine body,
The dust collection guide is provided with a guide wall portion, and the guide wall portion is engaged with the guide convex portion from above, allowing the dust collection guide to be retracted upward, while lowering the guide convex portion. A dust collection guide that is configured to be displaced downward by displacement and to approach the cutting edge. The dust collection guide according to any one of claims 1 to 4, wherein the dust collection guide is biased in a direction of rotating downward by a leaf spring. The dust collection guide according to claim 5, wherein the leaf spring has a function of guiding cutting powder toward the duct nozzle. The dust collection guide according to any one of claims 1 to 6, wherein the dust collection guide includes a lower auxiliary guide that is supported so as to be pivotable up and down and projects downward when the movable cover is opened. 8. The dust collection guide according to claim 7, wherein the lower auxiliary guide is slidably contacted with the cutting material as the cutting machine body moves in a cutting material surface direction, and retracts to retract the lower auxiliary guide upward. A dust collection guide with a guide. The dust collection guide according to any one of claims 1 to 8, wherein the dust collection guide is supported so as to be pivotable up and down, and when the dust collection guide is pivoted downward, the dust collection guide is relatively pivoted upward to cut powder. A dust collection guide having an upper auxiliary guide for guiding the dust toward the dust nozzle.

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