JP2008100296A - Chip antiscattering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chip antiscattering device capable of favorably preventing scattering of chips produced in cutting a work piece regardless of material of the work piece. <P>SOLUTION: This chip antiscattering device 10 is furnished with a mounting member 16 mounted rotatably on a shaft part main body 14 of a counter boring tool 12 and a cover member 18 mounted on this mounting member 16 free to slide in the rotating axial direction of the counter boring tool 12, always elastically energized forward and to surround a working area in cutting the work piece. The cover member 18 stores a cutting part 50 of the counter boring tool 12 in its storing area 48, and a knife edge of the counter boring tool 12 is positioned in the rear of a front end surface 42 of the cover member 18. The cover member 18 collects the chips in the storig area 48 of the cover member 18 by always surrounding the working area by sliding backward in cutting the work piece. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chip scattering prevention device, and more particularly to a chip scattering prevention device that prevents chips generated during cutting with a rotary cutting tool from scattering.

  For example, as a replaceable blade type rotary cutting tool that is used by being mounted on the rotary shaft of a drive motor in an electric tool, there are various cutters, such as drilling for screw holes and counterboring. Depending on the application, an appropriate rotary cutting tool is selectively used. When cutting using a rotary cutting tool, there are problems such as chips generated at the time of cutting scattered around and contaminating the work site, and chips etc. flying to the worker and causing danger. . Therefore, as a countermeasure against such a problem, for example, Patent Document 1 proposes a scattering preventer that prevents chips (iron scraps) generated during processing of iron material from scattering.

That is, this scattering prevention device is a ring-shaped support member that is installed so as to cover the processing part of the iron material, and a ring-shaped member that is attached to the outer periphery of the support member and fixes the support member to the iron material by magnetic force. It consists of a permanent magnet. And the rotary blade of an electric tool is inserted in through the opening part provided in the support member, and the drilling process of an iron material is performed. At this time, since the cutting part of the iron material is covered with the support member, the chips are prevented from being scattered and the chips are attracted to the inner peripheral surface of the support member magnetized by the magnetic force of the permanent magnet. Yes.
JP 2004-17278 A

  By the way, when processing indoor wall materials and ceiling materials at the time of renovation, there is a risk that chips will scatter and the interior will be dirty and furniture etc. may be damaged. Becomes more important. In particular, when cutting the ceiling, the chips are scattered over a wide area and scattered not only in the room, but also on the operator, and the chips fall on the worker, resulting in a decrease in work efficiency and danger. There is. However, since the building materials to be processed in the indoor work are generally wood-based materials or ceramic-based materials, it is not possible to use the anti-scattering device as disclosed in Patent Document 1, which is based on iron-based materials.

  Accordingly, the present invention has been proposed to solve the above-mentioned problems inherent in the conventional technology, and is also used when cutting wood-based or ceramic-based materials. An object of the present invention is to provide a chip scattering prevention device that can be used.

In order to solve the above-described problems and achieve the desired purpose suitably, the chip scattering prevention device according to the present invention is a chip scattering prevention device that prevents chip scattering that occurs when a workpiece is cut by a rotary cutting tool. There,
A mounting member rotatably disposed on a shaft body of the rotary cutting tool;
A cover member that is slidably attached to the attachment member in the direction of the rotation axis of the rotary cutting tool, and that opens to the front capable of accommodating a cutting portion of the rotary cutting tool;
The cover member is always elastically biased toward the front, and at the time of cutting, the front end surface is pressed against the workpiece to surround the machining area.
According to invention of Claim 1, since it was set as the structure which attaches a chip scattering prevention apparatus to a rotary cutting tool, it can be used irrespective of materials, such as an iron type and a wood type, and the scattering of the chip which arises at the time of cutting suitably Can be prevented. Further, the cover member slides in the direction of the rotation axis, so that the machining area is always covered during cutting, and most of the chips can be collected in the cover member.

In the chip scattering preventing device according to the second aspect, the front end surface of the cover member is positioned in front of the cutting edge of the cutting portion when not cutting.
According to the invention of claim 2, since the front end surface of the cover member is positioned in front of the cutting edge of the rotary cutting tool at the time of non-cutting, the cutting is started after the processing region is covered by the cover member. It is possible to prevent chips from being scattered.

In the chip scattering preventing device according to the third aspect, the cover member includes a base portion that is attached to the attachment member, and a cover body that is detachably attached to the base portion and opens forward so as to accommodate the cutting portion.
According to the invention of claim 3, since the cover main body is detachably attached to the base portion, when it is not necessary to prevent the chips from being scattered, the cover main body may be removed from the base portion and used. The trouble of removing from the rotary cutting tool is reduced. When the cutting blade of the rotary cutting tool is of a replaceable blade type, the cutting blade can be easily replaced without being obstructed by the cover body by removing the cover body from the base.

In the chip scattering preventing device according to the fourth aspect, the discharge opening and the air inflow hole are opened in the cover member, and the chips in the cover member are discharged by the suction means through the discharge opening, and the air inflow hole is formed. Air was introduced into the cover member.
According to the invention of claim 4, since the chips in the cover member can be discharged to the outside through the discharge opening, it is possible to prevent the chips from being accumulated in the cover member and biting into the rotary cutting tool. obtain. And since air is taken in into a cover member via an air inflow hole, smooth discharge of chips can be realized.

In the chip scattering preventing device according to the fifth aspect, there is provided an adjusting means capable of adjusting the sliding amount of the cover member.
According to invention of Claim 5, it becomes possible to adjust the cutting amount of a workpiece by changing the sliding amount of a cover member.

  According to the chip scattering preventing device according to the present invention, it can be used regardless of the material of the workpiece, and chip scattering generated during cutting can be suitably prevented.

  Next, a chip scattering preventing device according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. In addition, in an Example, the case where the counterbore cutter which performs counterbore hole processing as a rotary cutting tool is employ | adopted, and the chip scattering prevention apparatus is mounted | worn to this counterbore cutter is illustrated. However, the rotary cutting tool to which the chip scattering preventing device according to the present invention can be attached is not limited to this counterbore cutter, and may be any rotary cutting tool such as a drill or various cutters. In the following description, the front indicates the machining direction of the rotary cutting tool (right in FIG. 1), and the rear indicates the opposite direction of the machining direction (left in FIG. 1).

(Example 1)
FIG. 1 is an explanatory cross-sectional view illustrating a state in which the chip scattering prevention device 10 according to the first embodiment is mounted on a counterbore cutter 12. The chip scattering prevention device 10 is mounted on a shaft body 14 of the counterbore cutter 12 so as to be rotatable, and is mounted on the mounting member 16 so as to be slidable in the direction of the rotation axis of the counterbore cutter 12. It is basically composed of a cover member 18 that is elastically biased toward the front. The counterbore cutter 12 of the first embodiment is a known cutter that is generally commercially available, and is detachably attached to an electric tool or the like (not shown). The counterbore cutter 12 includes a shaft body 14 on which the mounting member 16 is extrapolated, and a cutting portion 50 that is integrally formed on the front side of the shaft body 14 and performs cutting. A mounting portion 64 that is detachably attached to the rotating shaft of the electric tool is formed behind the shaft portion main body 14. A fixed hole 50a is opened in the axial direction at the center of rotation of the cutting part 50, and a center drill 68 is detachably fixed to the fixed hole 50a. The center drill 68 functions to guide the counterbore cutter 12 in the cutting direction during cutting.

  As shown in FIGS. 2 and 3, the attachment member 16 of the chip scattering prevention device 10 is a cylindrical body having a flange portion 24 at the rear end, and is along the central axis direction of the cylindrical body portion 102 that forms the main body. A through hole 16a is opened inside. As shown in FIG. 1, two bearings 28 are provided in the through hole 16 a so as to be separated from each other in the front-rear direction. By inserting the shaft body 14 of the counterbore cutter 12 into the through hole 16 a, An attachment member 16 is rotatably attached to the counterbore cutter 12. Further, a nut 106 is screwed into the shaft body 14 of the counterbore cutter 12 inserted through the through hole 16a from the rear via a spacer 104, whereby the counterbore cutter 12 is detachably attached to the mounting member 16. It is supposed to be fixed. A plurality of recesses 30 (only two are shown in FIG. 1) are provided on the front surface side of the flange portion 24 so as to be spaced apart from each other by a predetermined distance in the circumferential direction. The rear end faces the concave portion 30 and is positioned. Further, a plurality of screw holes 16b (only two are shown in FIG. 1) are formed on the front surface side of the cylindrical body portion 102 in the mounting member 16, and screws for fixing the fixing member 32 to the mounting member 16 in the screw holes 16b. 38 is screwed.

  The cover member 18 surrounds the processing portion (processing region) of the workpiece and prevents the chips 40 (see FIG. 5) from scattering. The cover member 18 is formed of a transparent resin in a cylindrical body whose front is opened. It is formed by molding. As shown in FIG. 1, an opening 18a that is set slightly larger than the diameter of the columnar body portion 102 in the mounting member 16 is opened at the center of the rear surface of the cover member 18, and the rear from the opening 18a. A cylindrical sleeve portion 46 extends toward the end. Then, the mounting member 16 is inserted into the sleeve portion 46 from the rear side, and the cover member 18 is slidably attached to the mounting member 16 in the front-rear direction (rotational axis direction of the counterbore cutter 12). It is like that.

  As shown in FIG. 1, the accommodation area 48 defined inside the cover member 18 is set to a size that can accommodate the entire cutting portion 50 of the counterbore cutter 12. Further, a plurality of through holes 18b (only two are shown in FIG. 1) are formed on the rear surface of the cover member 18 along the periphery of the opening 18a, and a guide for the fixing member 32 is provided in the through hole 18b. The pin 34 is inserted from the front side.

  As shown in FIG. 2, the fixing member 32 corresponds to a disk-shaped fixing plate 56 having a diameter larger than the inner diameter of the opening 18 a in the cover member 18, and the through holes 18 b in the fixing plate 56. A plurality of guide pins 34 extending rearward from the rear surface of the fixing plate 56 at the position. As shown in FIG. 1, an insertion hole 56a through which the shaft body 14 of the counterbore cutter 12 can be inserted is opened at the center of the fixed plate 56, and the attachment hole 56a is formed around the insertion hole 56a. Through holes 56b are provided at positions corresponding to the screw holes 16b of the member 16, respectively. Then, with the cylindrical body portion 102 of the mounting member 16 inserted through the sleeve portion 46 of the cover member 18 and facing the opening 18a of the cover member 18, the fixing plate 56 of the fixing member 32 is attached to the mounting member 16 and The fixing member 32 is fixed to the mounting member 16 by coming into contact with the inner front surface of the cover member 18 and screwing the screw 38 inserted through each through hole 56b into the corresponding screw hole 16b. Thereby, the cover member 18 is slidably attached between the flange portion 24 of the attachment member 16 and the fixed plate 56.

  Each guide pin 34 is positioned in a state where the guide pin 34 penetrates the cover member 18 through a corresponding through hole portion 18 b of the cover member 18 and the rear end thereof faces the concave portion 30 of the flange portion 24. Each guide pin 34 is configured such that a spring 58 is inserted between the flange portion 24 and the cover member 18, and the cover member 18 is always urged forward by the elastic force of the spring 58. Therefore, as shown in FIG. 1, the cover member 18 is moved from the intended position where the inner front surface thereof is in contact with the fixing plate 56 of the fixing member 32, as shown in FIG. The rear end of the sleeve portion 46 can slide to a position where it abuts on the flange portion 24 of the mounting member 16. That is, the slide amount L of the cover member 18 is a separation interval from the rear end of the sleeve portion 46 to the front surface of the flange portion 24 as shown in FIG. Therefore, by changing the protruding length of the sleeve portion 46, the dimension of the slide amount L can be adjusted, and accordingly, the cutting amount (cutting depth) of the workpiece can be changed as appropriate. In the embodiment, the cutting edge of the cutting blade 52 provided in the cutting portion 50 is at the position of the cover member 18 at the expected position in the state where the chip scattering prevention device 10 is mounted on the counterbore cutter 12. It is set to be slightly behind the front end face 42.

(Operation of Example 1)
Next, the effect | action of the chip scattering prevention apparatus 10 which concerns on Example 1 mentioned above is demonstrated. In addition, in the following description, the case where the disk-shaped installation recessed part 22 for attaching a fire alarm to the indoor ceiling (workpiece material) 20 is provided is demonstrated as an example of use. First, the assembly of the chip scattering prevention device 10 will be briefly described with reference to FIG. 2. The mounting member 16 is inserted into the sleeve portion 46 of the cover member 18, and as shown in FIG. With the front face facing the opening 18 a of the cover member 18, the fixing member 32 is installed in the accommodation area 48 of the cover member 18. That is, the guide pins 34 of the fixing member 32 are inserted into the corresponding through holes 18 b of the cover member 18, and the springs 58 are externally inserted into the guide pins 34 protruding from the cover member 18, so that the flange portion of the mounting member 16 is inserted. The rear end of the guide pin 34 faces the recess 30 provided in 24. The through holes 56b of the fixing plate 56 in the fixing member 32 and the corresponding screw holes 16b of the mounting member 16 are aligned, and the screws 38 inserted into the through holes 56b are inserted into the corresponding screw holes 16b to fix the fixing member 32. Is fixed to the mounting member 16. Accordingly, the cover member 18 is slidably attached to the attachment member 16 in a state where the cover member 18 is always urged forward by the plurality of springs 58.

  Next, the counterbore cutter 12 is inserted from the front side of the cover member 18 through the insertion hole 56 a of the fixing plate 56 and the through hole 16 a of the mounting member 16, and fixed by the nut 106 through the spacer 104. At this time, the attachment member 16 is rotatably attached to the shaft body 14 of the counterbore cutter 12 by the bearings 28 and 28. That is, the chip scattering preventing device 10 is attached to the counterbore cutter 12 in a freely rotating state, and the chip scattering preventing device 10 does not rotate with the rotation of the cutter 12. The center drill 68 is inserted and attached to the fixing hole 50a provided in the cutting part 50 of the counterbore cutter 12 from the front.

  4 and 5 are diagrams illustrating an example in which cutting is performed using the chip scattering prevention device 10. First, the counterbore cutter 12 to which the chip scattering preventing device 10 is attached is mounted on the rotating shaft of the electric tool. Next, as shown in FIG. 4 (a), the center drill 68 is drilled at the center of the processed portion of the ceiling 20. When the electric tool is pushed up according to the guide of the center drill 68, as shown in FIG. 4B, the front end of the cover member 18 comes into contact with the ceiling 20, and the cover member 18 surrounds the processing region. At this time, the cover member 18 is in the initial position, and the edge of the counterbore cutter 12 is not in contact with the ceiling 20.

  When the operator further pushes up the electric tool, the counterbore cutter 12 moves forward (upward in FIG. 5) together with the mounting member 16 and the fixing member 32 against the elastic force of the spring 58, as shown in FIG. The counterbore cutter 12 begins to cut the ceiling 20. Specifically, the sleeve portion 46 slides on the mounting member 16 while the rear surface of the cover member 18 presses and shrinks the spring 58, and the cover member 18 slides backward (downward in FIG. 5). That is, the cover member 18 slides rearward relative to the mounting member 16, and the spot facing cutter 12 cuts the processing area surrounded by the cover member 18. Thereby, the chips 40 generated by the cutting are collected in the accommodating area 48 of the cover member 18, and the chips 40 are not scattered around.

  When the cutting operation proceeds and the cover member 18 comes into contact with the front end of the flange portion 24 of the mounting member 16 and the rear end of the sleeve portion 46 abuts, the counterbore cutter 12 cannot be pushed any further. Finish cutting. At this time, since the slide amount L of the cover member 18 is set to a desired cutting depth (here, a depth at which the fire alarm can be installed), the installation recess 22 opened in the ceiling 20 is The depth is accurate. That is, since the cutting amount is defined by the slide amount L, the operator can simply push up the electric tool from the initial position to the position where the rear end of the sleeve portion 46 contacts the front surface of the flange portion 24. A sufficient amount of cutting can be secured. Further, the chips 40 generated by the cutting are collected in the cover member 18 without being scattered outside, and the room is not soiled. As described above, the chip scattering prevention device 10 according to the first embodiment can be used for cutting processing on a wood-based material, and can suitably prevent the chips 40 from scattering during processing.

(Example 2)
Next, the chip scattering preventing apparatus according to the second embodiment will be described. In the second embodiment, only portions different from the first embodiment will be described, and portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is an explanatory cross-sectional view illustrating the chip scattering prevention device 70 according to the second embodiment. The cover member 72 of the second embodiment includes a disc-shaped rear surface portion (base portion) 74 in which the sleeve portion 46 is formed, and A cylindrical cover body 76 attached to the rear surface portion 74 is configured separately. A screw portion 74a is formed on the outer peripheral portion of the rear surface portion 74, and a screw portion 76a formed on the rear end of the inner peripheral surface of the cover main body 76 is screwed into the screw portion 74a, whereby the cover main body 76 is attached to the rear surface portion. 74 is configured to be detachably attached. The rear surface portion 74 is formed with a through-hole portion 18b, an opening portion 18a, and the like, as in the first embodiment.

  Further, a discharge opening 80 for discharging the chips 40 collected in the storage area 48 of the cover member 72 to the outside is provided at a required portion of the rear surface portion 74. One end of a hose 82 that feeds the chips 40 is connected to the discharge opening 80 from behind, and a suction means (not shown) is connected to the other end of the hose 82. And it is comprised so that the chip 40 may be discharged | emitted outside via the opening part 80 for discharge | emission and the hose 82 by the action | operation of a suction means. Further, the cover main body 76 is provided with an air inflow hole 84 that allows air to flow into the housing area 48 so that air is taken into the housing area 48 through the air inflow hole 84 when the chips 40 are discharged. It has become. When there is no need to discharge the chips 40, the discharge opening 80 and the air inflow hole 84 are closed by the cap 86 or the like.

  As described above, in the chip scattering preventing device 70 according to the second embodiment, since the rear surface portion 74 and the cover main body 76 constituting the cover member 72 are separated from each other, the following advantages are provided. That is, when it is required to prevent the chips 40 from being scattered as in indoor work, the cover body 76 may be attached to the rear surface portion 74 and the chips 40 may be collected by the cover member 72. On the other hand, when the chips 40 may be scattered, such as outdoors, it is not necessary to bother to remove the entire chip scattering prevention device 70 from the counterbore cutter 12, and only the cover body 76 may be removed from the rear surface portion 74. . That is, the attachment member 16 and the rear surface portion 74 are always attached to the counterbore cutter 12, and only the cover main body 76 may be attached and detached as necessary, so that the trouble of removal can be reduced. In the second embodiment, the attachment of the cover main body 76 and the rear surface portion 74 is achieved by the screw portions 74a and 76a. For example, the cover main body 76 and the rear surface portion 74 are connected by a known fixing means such as a screw. It is good also as a structure attached by.

Example 3
Next, the chip scattering preventing apparatus according to the third embodiment will be described below. Also in the third embodiment, only the parts changed from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  FIG. 7 is an enlarged cross-sectional view of a main part illustrating the chip scattering preventing device 90 according to the third embodiment. In the first and second embodiments, the configuration in which the cover members 18 and 72 are urged forward by the plurality of springs 58 is employed. In contrast, the cover member 18 according to the third embodiment is configured to be urged forward by one spring 92 wound around the outer peripheral surface of the mounting member 16. Therefore, in the third embodiment, unlike the first and second embodiments, the guide pin 34 of the fixing member 32 is not necessary, and the fixing member 94 of the third embodiment is constituted only by the fixing plate 56. Thereby, the number of parts of the chip scattering prevention device 90 can be reduced, the product cost can be reduced, and the slide structure of the cover member 18 is simplified, so that a failure or the like hardly occurs.

  In the first and second embodiments, the sliding amount L is defined to be constant by the protruding length of the sleeve portion 46 in the cover members 18 and 72. However, in the chip scattering preventing device 90 according to the third embodiment, the adjusting means 96 capable of adjusting the slide amount of the cover member 18 is provided. That is, a ring-shaped adjusting means 96 is extrapolated around the rear end of the sleeve portion 46 in the cover member 18 so as to be movable in the front-rear direction, and the adjusting means 96 is moved to a required position of the sleeve portion 46 by a required fixing means 98. It is supposed to be fixed to. Specifically, the adjusting means 96 is provided with a plurality of long holes 100 (only one is shown in FIG. 7) extending in the front-rear direction, and a screw corresponding to each long hole 100 is provided at the rear end of the sleeve portion 46. Open the hole 46a. Then, the adjusting means 96 is fixed by sliding the adjusting means 96 back and forth to the desired position and screwing the screw 98 as the fixing means into the screw hole 46a through the long hole 100. It is supposed to be. That is, the sliding amount of the cover member 18 according to the third embodiment is set so that it can be adjusted in inverse proportion to the protruding amount of the adjusting means 96.

  Accordingly, when the cutting amount of the work material is small (shallow), as shown in FIG. 7A, the adjusting means 96 is fixed at a position shifted backward to reduce the sliding amount of the cover member 18. do it. Further, when a large amount of cutting is required (deep), as shown in FIG. 7B, the adjusting means 96 may be fixed at the front position to ensure a large sliding amount of the cover member 18. That is, in the chip scattering preventing device 90 according to the third embodiment, the slide amount can be adjusted in accordance with the cutting amount of the workpiece. However, this adjustment means 96 is an example, and other configurations can be appropriately employed as long as the slide amount of the cover member 18 can be adjusted.

  In the first to third embodiments, the case where the chip scattering prevention devices 10, 70, 90 can be detachably attached to the counterbore cutter 12 is shown. However, the chip scattering prevention device is attached to the counterbore cutter 12 integrally. It may be what was made. In the first to third embodiments, the cutting edge of the counterbore cutter 12 is set to be located on the rear side of the front end face 42 of the cover members 18 and 72, but the cutting edge may be made to coincide with the front end face 42. The cover members 18 and 72 and the attachment member 16 are all cylindrical, but they may be polygonal hollow columnar bodies.

  In the embodiment, the cover members 18 and 72 are always urged forward by elastic means such as springs 58 and 92. However, the cover member may be formed in a bellows shape so that the cover member itself can be expanded and contracted. Is possible.

It is explanatory sectional drawing which shows the chip scattering prevention apparatus which concerns on Example 1. FIG. It is an exploded view which shows the chip scattering prevention apparatus and counterbore cutter which concern on Example 1. FIG. It is a perspective view which shows the state which mounted | wore the counterbore cutter with the chip-scattering prevention apparatus which concerns on Example 1. FIG. It is a figure which shows a mode that it cuts using a chip scattering prevention apparatus, Comprising: (a) shows the state which a center drill cuts a workpiece, (b) shows the state which the front end of the cover member reached to the workpiece Indicates. It is a figure which shows a mode that it cuts using a chip scattering prevention apparatus, Comprising: (a) shows the state which a counterbore cutter cuts a workpiece, (b) shows the state which the cover member slid back most. . It is explanatory sectional drawing which shows the chip scattering prevention apparatus which concerns on Example 2. FIG. It is explanatory sectional drawing which shows the chip scattering prevention apparatus which concerns on Example 3, Comprising: (a) shows the case where a slide amount is set small, (b) shows the case where a slide amount is set large.

Explanation of symbols

10 Chip scattering prevention device (Example 1), 12 counterbore cutter (rotary cutting tool)
14 Shaft body, 16 mounting member, 18 cover member (Example 1, Example 3)
20 Ceiling (work material), 40 chips, 42 front end face, 50 cutting part 70 chip scattering prevention device (Example 2), 72 cover member (Example 2)
74 rear surface (base), 76 cover body, 80 discharge opening 84 air inflow hole, 90 chip scattering prevention device (Example 3), 96 adjusting means

Claims (5)

A chip scattering prevention device (10, 70, 90) for preventing chips (40) from being scattered when the workpiece (20) is cut by the rotary cutting tool (12),
A mounting member (16) rotatably disposed on the shaft body (14) of the rotary cutting tool (12);
A cover member (18) that is slidably attached to the attachment member (16) in the direction of the rotation axis of the rotary cutting tool (12) and that can open the cutting portion (50) of the rotary cutting tool (12). , 72)
The cover member (18, 72) is always elastically biased toward the front, and at the time of cutting, the front end face (42) is pressed against the workpiece (20) to surround the machining area. An apparatus for preventing chips from scattering.   The chip scattering preventing device according to claim 1, wherein the cover member (18, 72) has a front end face (42) positioned in front of a cutting edge of the cutting portion (50) when not cutting.   The cover member (72) includes a base portion (74) attached to the attachment member (16), and a cover that is detachably attached to the base portion (74) and opens forward to accommodate the cutting portion (50). The chip scattering preventing device according to claim 1 or 2, further comprising a main body (76).   A discharge opening (80) and an air inflow hole (84) are opened in the cover member (72), and chips (40) in the cover member (72) are removed by the suction means through the discharge opening (80). The chip scattering prevention device according to any one of claims 1 to 3, wherein the chip scattering prevention device is configured to discharge and to take air into the cover member (72) through the air inflow hole (84).   The chip scattering preventing device according to any one of claims 1 to 4, further comprising an adjusting means (96) capable of adjusting a sliding amount of the cover member (18).

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