JP5465556B2 - Dust collection structure of cutting tool - Google Patents

Description

The present invention relates to a structure for efficiently collecting dust or the like generated by a cutting operation in a cutting tool called a dustproof cutter for masonry, for example.
In this specification, cutting is used as a concept including not only a process of separating materials but also so-called grooving and grinding.

In this type of cutting tool having a rotating rotary cutter that is rotating, a device is provided for efficiently collecting dust by blowing up dust generated by processing such as cutting or grinding into a blade case with a rotating cutter. . Conventionally, the technique regarding the dust collection structure in this kind of cutting tool is disclosed by the following patent document, for example.
This conventional dust collection structure has a structure in which a dust collection flange is provided inside a blade case covering the upper part of a circular rotary blade so as to protrude above the cutting portion and to the side of the rotary blade. Thus, according to the dust collecting flange portion, the dust blown up from the cutting portion into the blade case can be efficiently guided to the dust collecting duct side.

Japanese Patent Laid-Open No. 60-6402

However, since the conventional dust collecting flange portion is fixed in a state of projecting in the blade case, for example, when the rotary blade is to be removed in order to replace the rotary blade, the rotary blade interferes with the dust collecting flange portion. In this case, it is necessary to remove the cover of the blade case from the dust collecting flange portion, so that there is a problem that workability at the time of exchanging the rotary blade is greatly impaired.
An object of the present invention is, for example, to obtain a dust collection efficiency equivalent to that of a conventional fixed type without impairing workability when exchanging a rotary blade.

Said subject is solved by each following invention.
The first invention includes a rotating rotary blade and a blade case that covers the rotary blade, and the blade case is provided with a dust collection flange for collecting dust blown into the blade case by the rotary blade. The dust collection flange portion is a dust collection structure provided so as to be movable between a dust collection position protruding to the side of the rotary blade and a retreat position retracted from the side of the rotary blade.
According to the first invention , the dust collecting flange portion can be moved between the dust collecting position and the retracted position. In a state where the dust collection flange portion is positioned at the dust collection position, the dust blown up into the blade case by the rotation of the rotary blade is blown against the dust collection flange portion and collected. On the other hand, if the dust collection flange is moved to the retracted position, the dust collection flange will move away from the side of the rotary blade, and this dust collection flange will interfere with the removal of the rotary blade from the spindle. Thus, the convenience of exchanging the rotary blade can be improved.
According to a second invention, in the first invention, the dust collection flange portion is a dust collection structure biased toward the dust collection position.
According to the second invention, in a state where the dust collecting flange portion is not operated to move to the retracted position side, the dust collecting flange portion is held at the dust collecting position, so that reliable dust collection can be performed.
According to a third aspect of the present invention, in the first or second aspect, the dust collecting flange portion enters the surface of the rotary blade from the outside of the blade case through a slit provided in the blade case in a direction perpendicular to the rotary blade tool. It is a dust collection structure provided so as to be movable between a dust collection position that protrudes into a blade case and a retreat position that is separated from the rotary cutter in a direction perpendicular to the dust collection position.
According to the third invention , since the moving direction of the dust collecting flange is the direction perpendicular to the surface on the removal side of the rotary blade, the moving distance between the dust collecting position and the retracted position of the dust collecting flange is set as small as possible. However, it is possible to achieve both dust collection efficiency and convenience when removing the rotary blade. The moving direction of the dust collecting flange portion may be configured to be a surface direction in addition to a configuration in which the direction of the rotary blade is perpendicular to the surface.
According to a fourth aspect of the invention, in any one of the first to third aspects, the blade case is configured such that a case cover that covers the side of the rotary blade is detachably coupled to a case main body that covers the periphery of the rotary blade. The dust collection flange portion is a dust collection structure that is supported so as to be movable between a dust collection position and a retracted position via a member for coupling the case cover to the case main body portion.
According to the fourth aspect of the invention , the member for joining the case cover to the case main body portion of the blade case can be provided with the function as the support member of the dust collecting flange portion, so that a separate support member is used. The configuration can be simplified as compared with the configuration.
A fifth invention is the dust collection structure according to any one of the first to fourth inventions, wherein the dust collection flange portion can be moved to the retracted position by manual operation from the outside of the blade case.
According to the fifth aspect , the dust collecting flange portion can be easily moved, and the usability of the dust collecting structure can be improved.
According to a sixth invention, in any one of the first to fifth inventions, a dust collecting duct is communicated with the inside of the blade case, and the dust collecting flange is located when the dust collecting flange portion is positioned at the dust collecting position. This is a dust collection structure in which dust is collected on the dust collection duct side by the part.
According to the sixth aspect of the invention , the dust blown up in the blade case is guided to the dust collection duct side by the dust collection flange portion, and efficient dust collection is performed.

It is a whole front view of the cutting tool provided with the dust collection structure of this embodiment. FIG. 2 is a longitudinal sectional view of the dust collection structure, taken along line (II)-(II) in FIG. 1. It is a front view of a cutting tool. This figure shows a state where the case cover and the cutting blade of the blade case are removed. It is sectional drawing which looked at the cutting tool from the back side. It is the figure which looked at the cutting tool from the front side.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire cutting tool 1 having a dust collecting structure according to this embodiment. This cutting tool 1 is called a portable maroon, and has a configuration in which a cutting machine body 10 is supported on the upper surface of a flat base 2 that is placed on a cutting material W. In FIG. 1, the user is located on the right side of the cutting tool 1. In FIG. 1, the cutting process proceeds by moving the cutting tool 1 to the left (the direction indicated by the white arrow in FIG. 1). In the following description, the direction in which the cutting process proceeds is the front side, and the front side as viewed from the user is the rear side. Unless otherwise specified, the user and the configuration of the member and the configuration are based on the user.
The cutting machine body 10 is supported on the upper surface of the base 2 by being coupled with a bracket portion 2 a provided on the upper surface of the base 2 via a support shaft 3 in a state in which the cutting machine body 10 can be tilted up and down. By changing the vertical tilt position of the cutting machine main body 10 with respect to the base 2 via the support shaft 3, the cutting depth of the rotary blade 12 with respect to the cutting material W can be adjusted. The vertical tilting position of the cutting machine body 10 with respect to the base 2 is fixed by tightening a fixing nut 4 provided at the rear end.
The cutting machine body 10 includes a circular rotary blade 12 that is rotated by an electric motor 15. The upper part of the rotary blade 12 is accommodated in the blade case 13. As shown in FIGS. 4 and 5, an electric motor 15 is attached to the right side portion of the blade case 13 via a speed reduction portion 14. As shown in FIG. 4, the electric motor 15 is coupled to the gear case 14 a of the speed reduction unit 14. A cooling fan 16 is attached to the output shaft 15a of the electric motor 15 protruding into the gear case 14a. The cooling fan 16 is integrally provided with a dust collecting fan 17. The cooling fan 16 and the dust collecting fan 17 are partitioned by a dustproof wall 18.
A drive gear 19 is meshed with a pinion gear portion 15b formed at the tip of the output shaft 15a of the electric motor 15. The drive gear 19 is fixed to the spindle 20. The spindle 20 protrudes into the blade case 13, and the rotary blade 12 is attached to the protruding portion.
The rotary blade 12 is fixed to the tip of the spindle 20 while being sandwiched between the receiving flange 26 and the fixed flange 27. The sandwiched state of the rotary blade 12 by the receiving flange 26 and the fixing flange 27 is locked by tightening the fixing screw 28 to the tip surface of the spindle 20. Therefore, if the fixing screw 28 is loosened and the fixing flange 27 is removed from the tip of the spindle 20, the rotary blade 12 can be removed while being displaced in the spindle axis direction.
A loop-shaped handle portion 29 is integrally provided on the side portion of the gear case 14a. A switch lever 29 a is provided inside the handle portion 29. When the user pulls the switch lever 29a with the fingertip of the hand holding the handle portion 29, the electric motor 15 is activated and the rotary blade 12 rotates, and when the user releases the fingertip and stops the pulling operation of the switch lever 29a. The electric motor 15 stops, and therefore the rotary blade 12 stops.

Partition walls 13a and 14c are provided inside the blade case 13 and the gear case 14a, respectively. The spindle 20 is rotatably supported by a bearing 21 attached to the partition wall portion 13a on the blade case 13 side and a bearing 22 attached to the partition wall portion 14c on the gear case 14a side. A first dust collection chamber 23 is defined between the partition wall portion 13a on the blade case 13 side and the partition wall portion 14c on the gear case 14a side, and a second dust collection chamber is defined between the partition wall portion 14c and the dust-proof wall portion 18. 24 is partitioned. The partition wall 13a on the blade case 13 side is provided with a plurality of dust collection windows 13b to 13b. The inside of the blade case 13 is communicated with the first dust collection chamber 23 through the dust collection windows 13b to 13b. A plurality of dust collecting holes 14b to 14b are provided in the partition wall portion 14c on the gear case 14a side. The first dust collection chamber 23 is communicated with the second dust collection chamber 24 through the dust collection holes 14b to 14b. A dust collection duct 25 communicates with the upper part of the second dust collection chamber 24. A dust collection bag is attached to the dust collection duct 25. In the figure, this dust collection bag is omitted. Instead of the dust bag, a dust collecting hose of the dust collector can be connected to the dust collecting duct.
The rotary blade 12 is rotated by the activation of the electric motor 15, and the cutting powder is pulled up into the blade case 13 from the cutting site by the rotation of the rotary blade 12. Further, when the electric motor 15 is activated, the dust collecting fan 17 rotates together with the cooling fan 16. As the dust collection fan 17 rotates, a wind flow from the blade case 13 toward the dust collection duct 25 through the first dust collection chamber 23 and the second dust collection chamber 24 is generated. Due to this wind, cutting powder or the like generated in the blade case 13 is collected in the first dust collecting chamber 23 through the dust collecting windows 13b to 13b, and further this is collected in the second dust collecting chamber through the dust collecting holes 14b to 14b. The dust is collected in the dust 24 and finally collected in the dust bag through the dust collecting duct 25.

The blade case 13 has a configuration in which a case cover 13d is attached to the case body 13c. The partition wall portion 13a is provided integrally with the case main body portion 13c. The rotary blade 12 is located between the partition wall 13a and the case cover 13d. A dust collecting member 30 is provided on the case cover 13d. As shown in FIGS. 1 and 2, the dust collecting member 30 has an L-shaped cross section having a dust collecting flange portion 30a and an operation edge portion 30b. An annular mounting portion 30 c is integrally provided on the upper part of the dust collecting member 30.
The dust collecting member 30 is supported on the left side surface of the case cover 13 d via a support member 31. The support member 31 includes a cylindrical body portion 31a, a head portion 31b, and a screw portion 31c. When the screw portion 31c is tightened into the screw hole 13f of the case main body portion 13c through the insertion hole 13e of the case cover 13d, the support member 31 is attached to the left side portion of the blade case 13, and the case cover 13d is attached to the case main body portion. It is fixed with respect to 13c. The dust collecting member 30 is supported on the side of the blade case 13 in a state where the cylindrical body portion 31a of the support member 31 is inserted into the inner peripheral hole 30d of the attachment portion 30c. A compression spring 33 is interposed between the head portion 31b of the support member 31 and the attachment portion 30c. The compression spring 33 biases the attachment portion 30c and the dust collection member 30 to the dust collection position side on the left side (opposite to the notation in FIG. 2) in FIG. The dust collecting member 30 is held at the dust collecting position by the compression spring 33 and can be moved to the retracted position against the compression spring 33.
The dust collection flange portion 30a of the dust collection member 30 is inserted into the blade case 13 through a slit 13g (insertion groove hole) provided in the case cover 13d. As shown in FIG. 2, when the dust collection member 30 is held at the dust collection position by the compression spring 33, the insertion margin for the slit 13 g of the dust collection flange portion 30 a becomes large, and the tip portion approaches the rotary blade 12. .

In the state where the dust collecting member 30 is held at the dust collecting position shown in FIG. 2, the dust collection window 13b is opened after the dust blown up into the blade case 13 by the cutting process is blown to the dust collecting flange 30a. Then, it is guided into the first dust collection chamber 23.
In FIG. 1, as indicated by the white arrow displayed on the case cover 13 d of the blade case 13, the rotary blade 12 rotates in the clockwise direction in the figure, so that cutting powder or the like is directed upward from the cutting portion C of the cutting material W. Blown up. The cutting powder blown upward is flowed in the clockwise direction with the wind generated by the rotation of the rotary blade 12 and blown against the dust collecting flange portion 30a of the dust collecting member 30, and then along the dust collecting flange portion 30a. Guided upward. As shown in FIG. 3, one dust collection window 13b is located above the dust collection flange portion 30a.
Further, due to the rotation of the dust collecting fan 17, a wind flow from the blade case 13 toward the dust collecting duct 25 is generated in the first and second dust collecting chambers 23 and 24. For this reason, dust or the like guided upward by the dust collection flange 30 a of the dust collection member 30 is sucked into the first dust collection chamber 23, and then passes through the second dust collection chamber 24 toward the dust collection duct 25. Washed away. From the above, dust or the like blown up into the blade case 13 is efficiently sucked into the first and second dust collecting chambers 23 and 24 by the dust collecting flange portion 30a and then collected into the dust collecting duct 25. The
Thus, the dust collecting member 30 that is held at the dust collecting position and exhibits the dust collecting function can be moved to the retracted position. For example, the dust collecting member 30 is gripped by the user with the fingertip of the operation edge 30b, for example, and the dust collecting member 30 is moved in the direction indicated by the white arrow in FIG. The dust collecting flange portion 30a can be moved in a direction away from the rotary blade 12. This movement to the retracted position is performed against the compression spring 33.
Further, the dust collecting member 30 can be moved to a position where the dust collecting flange portion 30a is completely extracted from the slit 13g. In this case, the dust collection flange 30a is not protruded into the blade case 13 by tilting the dust collection member 30 forward or backward about the support member 31 and slightly shifting in the surface direction of the case cover 13d. Can be retained.
When returning the dust collecting member 30 to the dust collecting position, the dust collecting member 30 is returned by the urging force of the compression spring 33 if the finger is released with the dust collecting flange portion 30a inserted through the slit 13g. The dust collecting member 30 is positioned and held in the dust collecting position by the attachment portion 30c being pressed against the case cover 13d by the urging force of the compression spring 33. As described above, at the dust collection position, the tip edge of the dust collection flange portion 30 a is held at a position with a slight gap with respect to the side surface of the rotary blade 12.

According to the dust collection structure described above, the cutting powder blown from the cutting part C, particularly between the rotary blade 12 and the case cover 13d, in the blade case 13 is applied to the dust collection flange 30a of the dust collection member 30. Since it is restrained from being sprayed and scattered to the rear, the amount of dust guided into the first and second dust collecting chambers 23 and 24 can be increased accordingly, and thus more efficient dust collection can be achieved. It can be carried out. In particular, when cutting is performed with the cutting machine body 10 displaced upward about the support shaft 3 to reduce the so-called cutting depth, the gap between the lower edge of the blade case 13 and the base 2 is opened. Therefore, by positioning the dust collection flange 30a at the dust collection position, it is possible to suppress the scattering of cutting powder and the like and efficiently guide it to the dust collection duct 25 side, thereby achieving high dust collection efficiency. Can be secured.
Moreover, the dust collecting member 30 can be easily moved to the retracted position by a user's manual operation. When the dust collecting member 30 is moved to the retracted position, the dust collecting flange portion 30a can be moved away from the rotary blade 12 in the direction perpendicular to the surface (left side in FIG. 4). Therefore, when the rotary blade 12 is moved to the left side in FIG. 4 and removed from the spindle 20 with the fixing screw 28 loosened and the fixing flange 27 removed from the spindle 20, the dust collecting flange portion 30a interferes, etc. And it won't get in the way. Therefore, according to the dust collection structure of the present example, if the dust collection member 30 is moved to the retracted position while the case cover 13d is attached to the case body 13c, the rotary blade 12 is removed and replaced. Can be done quickly.
Further, since the dust collecting member 30 is held at the dust collecting position where the dust collecting flange portion 30a is projected between the rotary blade 12 and the case cover 13d by the urging force of the compression spring 33, the conventional fixed type The same dust collection efficiency can be ensured.

Various modifications can be made to the embodiment described above. For example, although the configuration in which the dust collecting member 30 is moved in the direction perpendicular to the surface of the rotary blade 12 and moved to the dust collection position and the retracted position is illustrated, it is moved in the surface direction of the rotary blade 12 (the front-rear direction in FIG. 1). It is good also as a structure which is made to move to a dust collection position and a retracted position. In this case, the dust collecting member is provided so as to be tiltable in the front-rear direction along the inner surface of the case cover via the illustrated support member 31, and is configured to be retractable from the side of the rotary blade 12, for example, by rotating to the front side. That's fine.
Further, the support member 31 has a configuration in which a function (screw portion 31c) for connecting the case cover 13d to the case main body portion 13c and a function (column body portion 31a) for supporting the dust collecting member 30 are combined. However, apart from a fixing screw or the like for coupling the case cover 13d to the case main body 13c, the case cover 13d is provided with, for example, a support shaft, and the dust collecting member is movably supported through the support shaft. It is good also as a structure.
Furthermore, the illustrated dust collecting member can be similarly applied to various cutting tools for masonry, woodwork, or metalwork. Further, as the cutting tool, a so-called portable marnoco that performs cutting by moving the cutting machine main body 10 and the base 2 integrally on the cutting material W is illustrated. However, the cutting machine main body is used for the cutting material placed on the table. The present invention can be similarly applied to a so-called tabletop circular saw machine in which the rotary cutter is cut by moving the blade downward, and can be widely applied to a cutting tool such as a so-called grooving machine, a table saw or a panel saw.

W ... cutting material, C ... cutting part 1 ... cutting tool (portable marnoco)
DESCRIPTION OF SYMBOLS 2 ... Base, 2a ... Bracket part 3 ... Spindle 10 ... Cutting machine main body 12 ... Rotary blade 13 ... Blade case 13a ... Partition wall part, 13b ... Dust collection window, 13c ... Case main body part, 13d ... Case cover 13e ... Insertion Hole, 13f ... Screw hole, 13g ... Slit 14 ... Reduction part, 14a ... Gear case, 14b ... Dust collection hole, 14c ... Partition wall 15 ... Electric motor, 15a ... Output shaft 16 ... Cooling fan 17 ... Dust collection fan 18 ... Dust-proof wall 19 ... drive gear 20 ... spindle 21, 22 ... bearing 23 ... first dust collecting chamber 24 ... second dust collecting chamber 25 ... dust collecting duct 26 ... receiving flange 27 ... fixing flange 28 ... fixing screw 29 ... handle portion 30 ... Dust collecting member 30a ... Dust collecting flange part, 30b ... Operation edge part, 30c ... Mounting part, 30d ... Inner peripheral hole 31 ... Support member, 31a ... Cylindrical body part, 31b ... Head part, 31c ... Ne Part 33 ... compression spring

Claims (5)

A rotating rotary blade and a blade case that covers the rotary blade, and the blade case is provided with a dust collection flange for collecting dust blown into the blade case by the rotary blade; The dust collection flange portion enters the blade case from the outside of the blade case through a slit provided in the blade case in a direction perpendicular to the rotary blade and protrudes into the blade case. On the other hand, a dust collection structure provided so as to be movable between a retreat position separated in a direction perpendicular to the surface from the dust collection position . The dust collection structure according to claim 1, wherein the dust collection flange portion is biased toward the dust collection position. 3. The dust collecting structure according to claim 1, wherein the blade case has a configuration in which a case cover that covers a side of the rotary blade is detachably coupled to a case main body that covers the periphery of the rotary blade. The dust collection flange portion is supported by a dust collection structure movably supported between the dust collection position and the retracted position via a member for coupling the case cover to the case main body portion. . A dust collecting structure described in any one of claims 1 to 3 dust collection structure the dust flange portion is movable in the retracted position by a manual operation from outside of the blade case. The dust collection structure according to any one of claims 1 to 4 , wherein a dust collection duct is communicated with the inside of the blade case, and the dust collection flange portion is positioned at a dust collection position. A dust collection structure in which dust is collected on the dust collection duct side by the dust collection flange.

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