WO2011065214A1 - 切断機における可動カバー支持部の防塵構造 - Google Patents

切断機における可動カバー支持部の防塵構造 Download PDF

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Publication number
WO2011065214A1
WO2011065214A1 PCT/JP2010/069809 JP2010069809W WO2011065214A1 WO 2011065214 A1 WO2011065214 A1 WO 2011065214A1 JP 2010069809 W JP2010069809 W JP 2010069809W WO 2011065214 A1 WO2011065214 A1 WO 2011065214A1
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WO
WIPO (PCT)
Prior art keywords
dust
support ring
movable cover
elastic member
bearing box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/069809
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English (en)
French (fr)
Japanese (ja)
Inventor
奥村　道男
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Makita Corp filed Critical Makita Corp
Priority to EP10833061.4A priority Critical patent/EP2508285B1/en
Priority to CN201080058138.7A priority patent/CN102665984B/zh
Priority to US13/510,457 priority patent/US8813375B2/en
Publication of WO2011065214A1 publication Critical patent/WO2011065214A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B9/00—Portable power-driven circular saws for manual operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws

Definitions

  • This invention relates to a dust-proof structure of a movable cover support part in a cutting machine suitable for a case where high dust resistance against dust generated by cutting or grinding is required.
  • a portable cutting machine that is held by a user and moves on a cutting material to perform cutting processing has a configuration in which a cutting machine body is supported on the upper surface side of a base that is placed on the cutting material.
  • the main body of the cutting machine includes a circular cutting blade that is rotated by an electric motor, and the lower side of the cutting blade protrudes toward the lower surface side of the base and is cut into the cutting material.
  • the upper side of the cutting blade is covered with the main body case, and the lower side protruding to the lower surface of the base is covered with a movable cover.
  • the movable cover is rotatably supported by the main body case, is opened / closed according to the amount of cutting of the cutting blade with respect to the cutting material, and is biased to the closed side.
  • the movable cover is rotatably supported on the outer peripheral side of a bearing box having a cylindrical shape of the main body case on the base upper surface side.
  • a bearing that rotatably supports a spindle with a cutting blade attached thereto is attached to the bearing box.
  • cutting powder blown up from the cutting site by the cutting process is scattered.
  • the rotation support portion of the movable cover has an appropriate clearance (gap) in the radial direction and the axial direction with respect to the bearing box in order to ensure a smooth opening / closing operation.
  • an appropriate clearance for example, if dust such as cutting powder enters the gap between the rotation support portion of the movable cover and the bearing box, there is a risk of hindering the smooth opening and closing operation of the movable cover.
  • Conventionally, as a countermeasure against this dust for example, techniques disclosed in the following patent documents have been provided.
  • a second bearing for supporting the movable cover is attached to the outer peripheral side of the bearing box separately from the bearing for supporting the spindle, and the movable cover is rotatably supported via the second bearing.
  • the clearance is eliminated, and the seal member of the second bearing is shielded by a seal cover to prevent dust.
  • the prior art disclosed in the above-mentioned patent document is a configuration in which the movable cover is rotationally supported on the bearing box by using the second bearing in addition to the first bearing that rotationally supports the spindle in the main body case.
  • the technique which can take a more reliable dust-proof measure about the rotation support part of a movable cover, without using the special bearing which concerns is desired. Therefore, the present invention supports a movable cover that can be opened and closed smoothly without using a special bearing as in the conventional case, with respect to the rotation support portion for the main body case of the movable cover that opens and closes the cutting edge on the base lower surface side of the cutting blade.
  • it aims at further improving the dustproof property.
  • 1st invention is equipped with the base contact
  • the main body case of the movable cover in a cutting machine having a blade the upper part of this cutting blade is covered by the main body case, the lower part is protruded to the lower surface side of the base, and the cutting edge of the protruding part is covered by the movable cover
  • the rotating blade is attached to a spindle that is rotatably supported by a bearing housed in a bearing box of the main body case, and the movable cover includes a cylindrical support ring portion.
  • the support ring is rotatably supported on the outer peripheral side of the bearing box, and the blade tip can be opened and closed.
  • the support ring of the movable cover is supported by the bearing box.
  • an annular elastic member is pressed between the axial end surface of the support annular part and the axial restriction part.
  • This is a dustproof structure that is configured to block the dust intrusion path from the cutting blade side to the inner peripheral side of the support ring part.
  • an annular elastic member is interposed in a pressed state between the support ring portion (movable cover support portion) of the movable cover and the axial restriction portion of the bearing box, and the cutting blade Since the dust intrusion path from the side to the inner peripheral side of the support ring portion is blocked, the dust is prevented from entering the inner peripheral side of the elastic member.
  • the elastic member is interposed between the support ring portion and the axial direction restricting portion in a pressed state, it is possible to suppress the shakiness of the support ring portion in the axial direction, and thus open and close the movable cover. Shaking in the direction orthogonal to the direction (swing to the left and right in the opening and closing direction) can be suppressed.
  • the elastic member in the first invention, is displaceable in the diameter increasing direction against the biasing force in the diameter reducing direction, and the elastic member is provided between the support ring portion and the axial direction regulating portion.
  • a recess for accommodating at least a part of the elastic member is provided, and an inclined surface inclined in a direction of displacing the elastic member in the diameter-expanding direction by pressing of the axial restriction member is any of the axial restriction member, the support ring portion, and the elastic member.
  • This is a dust-proof structure.
  • the elastic member is a dustproof structure made of resin.
  • the elastic member is not made of metal, but is generated by pressing the elastic member by using, for example, a high-strength resin (polyacetal or the like) having a high slidability and a small friction coefficient as a material.
  • a high-strength resin polyacetal or the like
  • An increase in opening / closing resistance of the movable cover due to friction can be suppressed, and as a result, a smooth opening / closing operation of the movable cover can be ensured.
  • 4th invention is a dust-proof structure which formed the press surface with respect to the inclined surface of an elastic member in the 2nd invention in the flat surface.
  • the sliding resistance (rotational resistance) caused by pressing against the axial direction restricting portion is made as small as possible while ensuring the sealing performance of the dust intrusion path by surely expanding the elastic member in the diameter expanding direction.
  • a smooth opening / closing operation of the movable cover can be ensured.
  • a fifth invention is the dust-proof structure according to any one of the first to fourth inventions, wherein a washer is interposed between the elastic member and the axial restriction portion to which the elastic member is pressed.
  • the elastic member having a larger diameter can be surely pressed through the washer that can be processed into an arbitrary size.
  • a sixth invention is a dust-proof structure according to any one of the first to fifth inventions, wherein the pressing surface of the elastic member with respect to the axial direction restricting portion is formed as a flat surface so as to contact the surface. According to the sixth aspect of the present invention, it is possible to further increase the dustproof performance by increasing the pressing area (seal area) of the elastic member with respect to the axial restriction member.
  • a base on which a cutting material is placed, and a cutting machine main body supported on the upper surface of the base are provided.
  • the main body of the cutting machine has a main body case and a circular cutting blade rotated by an electric motor.
  • the cutting blade is attached to a spindle that is rotatably supported by a bearing accommodated in a bearing box of the main body case
  • the movable cover includes a cylindrical support ring part, and the support ring part is rotatably supported on the outer peripheral side of the bearing box so that the blade edge can be opened and closed.
  • the support ring part of the movable cover is restricted from being displaced in the axial direction by the axial restriction part provided in the bearing box part,
  • a dust-proof structure in which a dust-proof wall portion projecting to the outer peripheral side of the support ring portion is provided in the bearing box, and a dust intrusion path from the cutting blade side to the inner peripheral side of the support ring portion is bent.
  • the dust-proof structure according to this related invention 1 has a so-called labyrinth structure in which the dust intrusion path leading to the inner peripheral side of the support ring portion is bent, so that the smooth opening / closing operation of the movable cover is ensured. Dustproofness can be improved.
  • a base on which a cutting material is placed and a cutting machine main body supported on the upper surface of the base are provided.
  • the cutting machine main body has a main body case and a circular cutting blade that is rotated by an electric motor.
  • the cutting blade is attached to a spindle that is rotatably supported by a bearing accommodated in a bearing box of the main body case
  • the movable cover includes a cylindrical support ring part, and the support ring part is rotatably supported on the outer peripheral side of the bearing box so that the blade edge can be opened and closed.
  • the support ring part of the movable cover is restricted from being displaced in the axial direction by the axial restriction part provided in the bearing box part,
  • a dust-proof washer is attached to the spindle, and a peripheral portion of the dust-proof washer is inserted into a groove portion provided in the support annular portion, so that a dust intrusion path from the cutting blade side to the inner peripheral side of the support annular portion is provided.
  • Bent dustproof structure According to the dustproof structure according to the related invention 4, the labyrinth structure in which the dust intrusion path is bent is provided between the peripheral edge portion of the dustproof washer and the support ring portion, so that the movable cover can be smoothly opened and closed. The dustproofness can be improved while securing the above.
  • a dustproof structure according to the related invention 4 wherein the dustproof washer is provided with fins so that the dustproof washer functions as a dustproof fan for blowing off dust by rotation of the spindle.
  • the dust-proof washer that rotates integrally with the spindle functions as a dust-proof fan that blows off the generated dust. It can be further enhanced.
  • FIG. 3 is an enlarged view of part (III) of FIG. 2, and is a longitudinal sectional view of a dustproof structure between a support ring part of a movable cover and a bearing box.
  • FIG. 1 shows a cutting machine 1 called a portable circular saw.
  • the cutting machine 1 includes a base 2 that is placed on the upper surface of the cutting material W, and a cutting machine body 10 that is supported on the upper surface side of the base 2.
  • the cutting machine body 10 includes an electric motor 12 as a drive source on the back surface of the body case 11.
  • the rotational output of the electric motor 12 is transmitted to the spindle 14 through the reduction gear train 13.
  • the reduction gear train 13 is composed of a pinion gear 12 a and a drive gear 13 a of the electric motor 12 meshed with each other, and is housed in a gear box 18.
  • a drive gear 13 a is fixed on the spindle 14.
  • the spindle 14 is rotatably supported by the main body case 11 via bearings 15 and 16.
  • the front bearing 15 is held on the inner peripheral side of the bearing box 17.
  • a dust-proof seal member 15 a is attached to the inner peripheral side of the bearing box 15 and to the front side of the bearing 15.
  • the bearing 16 on the back side is held by a gear box 18.
  • a bearing box 17 is attached to the front side of the gear box 18.
  • the tip end side of the spindle 14 protrudes from the bearing box 17 and reaches the inside of the main body case 11.
  • a circular cutting blade 20 is attached to the tip of the spindle 14.
  • the cutting blade 20 is attached to the spindle 14 in a state of being firmly fixed in the axial direction and the rotational direction while being sandwiched between the outer side fixing flange 21 and the inner side fixing flange 22 in the plate thickness direction.
  • the clamped state of the fixing flanges 21 and 22 is firmly fixed by a fixing screw 23 fastened to the tip of the spindle 14.
  • a peripheral edge (cutting edge) in the range of approximately a half circumference on the upper side of the cutting blade 20 is covered with a cover portion 11 a of the main body case 11.
  • the lower half of the cutting blade 20 protrudes toward the lower surface side of the base 2 through a window portion 2 a provided in the base 2.
  • a portion of the cutting blade 20 protruding toward the lower surface side of the base 2 is cut into the cutting material W.
  • the peripheral edge (blade edge) of the cutting blade 20 in the range protruding to the lower surface side of the base 2 is covered with the movable cover 25.
  • the movable cover 25 is rotatably supported by the bearing box 17.
  • the movable cover 25 is supported so as to be openable and closable between a closed position that covers the entire circumference of the cutting edge within a range of the cutting blade 20 protruding toward the lower surface side of the base 2 and a fully opened position that exposes the entire circumference of the cutting edge. ing. Details of the movable cover 25 and the bearing box 17 that supports the movable cover 25 are shown in FIG.
  • the movable cover 25 includes a cover portion 25 a having a U-shaped cross section that covers the cutting edge of the cutting blade 20, and a cylindrical support ring portion 25 b that supports the cover portion 25 a on the bearing box 17.
  • the rotating boss portion 17a of the bearing box 17 is inserted into the inner peripheral side of the support ring portion 25b, and the movable cover 25 is supported coaxially with the spindle 14 so as to be rotatable.
  • the inner diameter dimension of the support ring portion 25b is appropriately set with respect to the outer diameter dimension of the rotating boss portion 17a so that rattling does not occur within a range that does not hinder the smooth rotation operation of the movable cover 25,
  • the clearance between the two is set to be as small as possible.
  • a tension spring 24 is interposed between the support ring portion 25 b and the bearing box 17.
  • the movable cover 25 is urged in the closing direction by the tension spring 24.
  • the tension spring 24 When the leading end of the movable cover 25 is brought into contact with the cut end of the cutting material W and the cutting machine 1 is moved in the cutting progress direction in this contacted state, the movable cover 25 is relatively resisted against the tension spring 24.
  • the exposed range of the cutting blade 20 is gradually expanded and cut into the cutting material W.
  • An axial direction restricting portion 17b is formed in a stepped shape on the outer periphery of the bearing box 17 and on the back side of the rotating boss portion 17a.
  • a retaining ring 19 is attached to the outer periphery of the bearing box 17 on the front side of the rotating boss portion 17a.
  • the support ring portion 25 b is restricted from axial displacement by the axial direction restricting portion 17 b and the retaining ring 19. Accordingly, the retaining ring 19 functions as an axial direction restricting portion that restricts displacement of the support ring portion 25b toward the front side.
  • a circular flat washer 19 a is sandwiched between the support ring portion 25 b and the retaining ring 19.
  • the support ring portion 25b is sandwiched between the retaining ring 19 as the axial direction restricting portion and the axial restricting portion 17b and the displacement (rattle) in the axial direction is restricted, thereby the movable cover.
  • the movement (rattle) of 25 in the cutting direction in the horizontal direction (arrow X direction in FIG. 1) is restricted.
  • a dust-proof structure is provided between the support ring portion 25b and the bearing box 17 to prevent intrusion of dust such as cutting powder between them.
  • the dustproof structure 30 of 1st Embodiment is equipped with the structure which inserted
  • the ring spring 31 corresponds to the elastic member described in the claims.
  • the ring spring 31 is formed into a ring shape (C-shape) using a high-strength resin (for example, polyacetal) having a high slidability and a small friction coefficient, and has an urging force in the direction of diameter reduction. Yes.
  • the ring spring 31 is fitted along an annular recess 25c provided on the front side end face of the support annular portion 25b. As shown in FIG. 3, an inclined surface 25d is formed between a side wall portion and a bottom portion on the small diameter side (lower side in FIG. 3) of the recess 25c.
  • the inclined surface 25d is inclined in a direction descending toward the outer peripheral side (upper side in FIG. 3) side wall portion.
  • the ring spring 31 is pushed into the recess 25c when the support ring portion 25b is sandwiched between the retaining ring 19 serving as the axial restricting portion and the axial restricting portion 17b and the axial displacement is restricted. Therefore, it is mounted in a state of being pressed against the inclined surface 25d. For this reason, the ring spring 31 is held in the recess 25c in a state of being displaced in the diameter increasing direction against the urging force. As a result, the ring spring 31 is caused by the axial component of the urging force with respect to the inclined surface 25d.
  • the pressing surface for the inclined surface 25d of the ring spring 31 and the pressing surface for the washer 19a are respectively formed on flat surfaces 31a and 31b over the entire circumference. For this reason, the ring spring 31 is pressed against the inclined surface 25d and the washer 19a in a surface contact state.
  • the cross-sectional shape of the ring spring 31 is not simply circular, and flat surfaces 31a and 31b are formed over the entire circumference, and each is pressed against the inclined surface 25d and the washer 19a in a face-to-face state.
  • the ring spring 31 is elastically pressed between the recess 25c of the support ring portion 25b and the washer 19a, so that dust is generated.
  • the dust intrusion path from the side (cutting blade 20 side) to the inner circumference side of the support ring portion 25b is blocked in the middle so that the dust intrusion to the inner circumference side of the support ring portion 25b is prevented. It has become.
  • the ring spring 31 ensures dust-proofing on the inner peripheral side of the support ring portion 25b and the periphery thereof, so that a smooth rotation operation of the support ring portion 25b and the movable cover 25 with respect to the bearing box 17 is ensured.
  • the dustproof structure 30 of the first embodiment by omitting a special bearing (second bearing) as in the past, the dustproof structure 30 is highly dustproof while reducing the cost of the support structure of the movable cover 25. Sex can be secured.
  • the ring spring 31 having high slidability is pressed against the retaining ring 19 as the axial direction restricting part via the washer 19a to prevent dust, the standard retaining ring is used as the axial restricting part.
  • the ring spring 31 having a larger diameter can be pressed against the retaining ring via a washer that can be processed into an arbitrary size, so that the degree of freedom in selecting the size of the ring spring that can be used is increased.
  • the intermediate sleeve 32 may be interposed between the support ring portion 25 b of the movable cover 25 and the bearing box 17 (second embodiment).
  • the intermediate sleeve 32 is formed of a high-strength resin having a high slidability (low frictional resistance), like the ring spring 31, and the inner peripheral surface of the support ring portion 25 b and the rotating boss of the bearing box 17.
  • the intermediate sleeve 32 is fixed to the outer peripheral side of the rotating boss portion 17a so as not to be displaced around the axis and in the axial direction.
  • the clearance between the support ring portion 25b of the movable cover 25 and the cylindrical portion 32a of the intermediate sleeve 32 is set to be smaller to improve dustproofness, It is possible to realize a smoother opening / closing operation of the movable cover 25 by suppressing the rattling between 32a.
  • FIG. 5 shows a dustproof structure 40 of the third embodiment with further modifications.
  • two rubber rings 42 and 43 are used as elastic members in place of the ring spring 31 in the first and second embodiments. Similar to the first or second embodiment, it suffices for members and configurations that do not need to be changed, and the description is omitted by using the same reference numerals.
  • the front side of the spindle 14 is rotatably supported by a bearing 15.
  • the bearing 15 is held by a bearing case 17.
  • a support ring portion 41a of the movable cover 41 is rotatably supported by the rotating boss portion 17a of the bearing case 17.
  • the support ring portion 41a has a cylindrical shape as in the first and second embodiments, and displacement in the axial direction is restricted by the axial restriction portion 17b and the retaining ring 19 of the bearing case 17.
  • the inner diameter dimension of the support ring portion 41a and the outer diameter dimension of the rotating boss portion 17a are dimensions that allow smooth rotation operation within a range in which the movable cover 41 does not wobble (displacement in the direction indicated by the arrow X in FIG. 1).
  • Is set to A washer 19a is sandwiched between the front end face of the support ring portion 41a and the retaining ring 19 as in the first and second embodiments.
  • Ring-shaped rubber rings 42 and 43 are attached to both the front and back end surfaces of the support ring portion 41a, respectively.
  • the rubber rings 42 and 43 are made of an inexpensive member called an O-ring (O-ring), and the cost can be reduced as compared with the configuration using the ring spring 31. It has been. Both rubber rings 42 and 43 are fitted into recesses 41b and 41c formed on both end surfaces of the support ring portion 41a, respectively. An inclined surface is formed in both concave portions 41b and 41c as in the first and second embodiments, and rubber rings 42 and 43 are pressed against the inclined surfaces, respectively.
  • O-ring O-ring
  • the rubber ring 42 on the front side is mounted in a state where it is pressed by the washer 19a against the inclined surface of the recess 41b with an appropriate pressing force and is expanded in the diameter expanding direction
  • the rubber ring 43 on the back side is mounted in the axial direction restriction.
  • the portion 17b is attached to the inclined surface of the concave portion 41c with an appropriate pressing force and is expanded in the diameter expanding direction.
  • the washer 19a and the axial direction restricting portion 17b are elastically caused by a reaction force caused by the pressing. It is in a state of being pressed.
  • the two rubber rings 42 and 43 attached in this way allow the dust intrusion path from the cutting blade 20 side (dust generation side) to the inner peripheral side of the support ring portion 41a to be the front side. And it has the structure blocked
  • the dustproof structure 40 of 3rd Embodiment comprised in this way the penetration
  • FIG. for this reason, even if a necessary and sufficient clearance is set between the support ring portion 41a and the support boss portion 17a of the bearing case 17 in order to ensure a smooth opening and closing operation, high dust resistance is ensured. Therefore, the cost of the support structure can be reduced by omitting the conventional bearing for rotating and supporting the movable cover.
  • FIG. 6 shows a dustproof structure 50 according to the fourth embodiment.
  • the fourth embodiment is a dust-proof structure mainly composed of a labyrinth structure and corresponds to an embodiment of the related invention.
  • the same members and configurations as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.
  • the support ring portion 51 a of the movable cover 51 is rotatably supported by the rotating boss portion 52 a of the bearing box 52.
  • the movable cover 51 is urged in the closing direction by a tension spring 24 mounted between the support ring portion 51 a and the bearing box 52.
  • the support ring portion 51 a is restricted in its displacement toward the front side by the retaining ring 19 attached to the bearing box 52, and its displacement in the rear side is restricted by an axial direction restriction portion 52 b provided at the rear side end of the bearing box 52. It is regulated.
  • a concave portion 51c is provided over the entire circumference on the front side end face of the support ring portion 51a.
  • the peripheral edge of the dustproof washer 53 enters the recess 51c.
  • the dustproof washer 53 is sandwiched between the flange portion 14 a of the spindle 14 and the inner fixing flange 22 and rotates integrally with the spindle 14.
  • the peripheral edge portion of the dustproof washer 53 is bent at a right angle toward the back surface side, and the bent portion 53a enters in a range where it does not come into contact with the recess 51c.
  • the bent portion 53a of the dustproof washer 53 enters the recessed portion 51c, a part of the dust intrusion path from the cutting blade 20 side to the inner peripheral side of the support ring portion 51a is bent to form a labyrinth structure (path bent structure).
  • path bent structure path bent structure
  • a dust-proof edge 52c is provided on the axial direction restricting portion 52b of the bearing box 52 so as to protrude to the front side over the entire circumference. As shown in the figure, the dust-proof edge 52c protrudes so as to cover the outer peripheral side of the back side end of the support ring portion 51a. For this reason, the dust-proof edge 52c shields the gap between the back-side end portion of the support ring portion 51a and the axial direction restricting portion 52b from the cutting blade 20 side (dust generation side), thereby the support ring The gap between the rear side end portion of the portion 51a and the axial direction regulating portion 52b and the dust prevention on the inner peripheral side of the support annular portion 51a are performed.
  • a plurality of fins 53b to 53b are provided on the front side periphery of the dustproof washer 53 so as to protrude to the front side.
  • the plurality of fins 53b to 53b are arranged at equal intervals in the circumferential direction and project to the front side within a range not interfering with the fixing flange 22.
  • the plurality of fins 53b to 53b function as a dust-proof fan when the dust-proof washer 53 rotates together with the spindle 14.
  • the front side of the support ring portion 51 a of the movable cover 51 is shielded from the cutting blade 20 side by the bent portion 53 a of the dust-proof washer 53 and the back side is dust-proof of the gear box 52.
  • Each edge 52c is shielded from the cutting blade 20 side.
  • the dustproof washer 53 that rotates integrally with the spindle 14 can function as a dustproof fan, so that dust generated on the cutting blade 20 side is supported by the support ring portion 51a side. Spraying to the bearing box 52 of this support ring portion 51a can also ensure a high dustproof property of the rotation support portion with respect to the bearing box 52.
  • the bent portion 53a of the dustproof washer 53 and the dustproof edge 52c of the bearing box 52 are not in contact with the support annular portion 51a.
  • the rotation operation of 51a with respect to the bearing box 52 and the smooth opening / closing operation of the movable cover 51 are not hindered.
  • FIG. 7 shows a dustproof structure 60 according to a fifth embodiment, which is obtained by further modifying the fourth embodiment.
  • the dustproof structure 60 of the fifth embodiment is different from the fourth embodiment in that a dustproof fan 61 is provided instead of the dustproof washer 53 of the fourth embodiment.
  • the same members and configurations as those of the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the dustproof fan 61 is integrally provided around the inner side fixing flange 22. For this reason, the dustproof fan 61 rotates integrally with the spindle 14.
  • a plurality of fins 61a to 61a are provided.
  • each fin 61a has a shape that extends to the back side as the outer peripheral side thereof.
  • the rear-side protrusions 61b of the fins 61a enter the recesses 51c provided at the front-side end of the support ring portion 51a as long as they do not interfere.
  • the dustproof fan 61 rotates integrally with the spindle 14.
  • the cutting blade 20 is formed by the rear-side protruding portions 61b of the fins 61a in which the gap between the front-side end surface of the support ring portion 51a and the retaining ring 19 that restricts the displacement to the front-side thereof rotates at high speed.
  • the gap between the end face on the back side of the support ring part 51a and the axial direction restricting part 52b that restricts the displacement of the support ring part 51a to the back side is also rotated by the dustproof edge 52c as in the fourth embodiment. Shielding from the blade 20 side prevents dust from entering the inner peripheral side of the support ring portion 51a. For this reason, the dustproof structure 60 of the fifth embodiment also reduces the cost by omitting the conventional second bearing while ensuring the high dustproofness of the rotation support portion with respect to the bearing box 52 of the support ring portion 51a. Can be planned. Also, according to the fifth embodiment, since dust generated on the cutting blade 20 side is blown off by the dustproof fan 61, high dustproofness in the vicinity of the support ring portion 51a can be ensured also in this respect.
  • FIG. 8 shows a dustproof structure 70 of the sixth embodiment.
  • This sixth embodiment has both an elastic member seal structure and a labyrinth structure, and the dustproof performance is further enhanced.
  • the same members and configurations as those of the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.
  • the dustproof structure 70 of the sixth embodiment is characterized by the structure of the support ring portion 71a of the movable cover 71 and the bearing box 72.
  • the support ring portion 71 a of the movable cover 71 is rotatably supported by the rotating boss portion 72 a of the bearing box 72. Displacement to the front side of the support ring portion 71 a is regulated by the retaining ring 19.
  • the displacement of the support ring portion 71 a toward the back side is regulated by an axial direction regulating portion 72 b provided in the bearing box 72.
  • a ring-shaped dustproof cover 73 is attached to the front side of the support ring portion 71a.
  • the dustproof cover 73 shields the gap between the retaining ring 19 and the front end face of the support ring portion 71a from the cutting blade 20 side (dust generation side).
  • the support ring portion 71a is integrally provided with a second dust-proof wall portion 71b projecting to the back side.
  • the second dust-proof wall portion 71b is formed in a cylindrical shape along the outer peripheral side of the support ring portion 71a.
  • the cylindrical first dust-proof wall portion 72c is also provided integrally with the axial direction restricting portion 72b of the bearing box 72 so as to protrude to the front side.
  • the first dust-proof wall portion 72c on the bearing box 72 side enters the inner peripheral side of the second dust-proof wall portion 71b on the support ring portion 71a side.
  • a concave portion 72d similar to the concave portion 25c of the first embodiment is formed on the front side of the axial direction restricting portion 72b of the bearing box 72 and on the outer peripheral side of the first dust-proof wall portion 72c.
  • one annular ring spring 74 is fitted in the recess 72d.
  • An inclined surface is formed between the inner peripheral side wall and the bottom of the recess 72d, and a ring spring 74 is pressed against the inclined surface.
  • the ring spring 74 is pressed against the inclined surface in the concave portion 72d by the second dust-proof wall portion 71b on the support ring portion 71a side and is displaced in the diameter increasing direction against the biasing force. It is pressed against the tip surface of the second dust-proof wall portion 71b by the axial component.
  • a tension spring 24 for biasing the movable cover 71 toward the closing side is interposed between the support annular portion 71a and the bearing box 72. In the case of the sixth embodiment, the tension spring 24 is interposed along the outer peripheral surface of the second dust-proof wall portion 71b on the support ring portion 71a side.
  • the gap between the front end face of the support ring portion 71a and the retaining ring 19 is cut by the dustproof washer 73 on the cutting blade 20 side (dust generation side). It is shielded from and dust-proof is made. Further, the gap between the back surface side of the support ring portion 71a and the axial direction restricting portion 72b is shielded from the cutting blade 20 side by the second dust-proof wall portion 71b and the first dust-proof wall portion 72c, and the dust is prevented. .
  • the second dust-proof wall portion 71b on the support ring portion 71a side and the dust-proof wall portion 72 on the bearing box 72 side are in the middle of the dust intrusion path from the cutting blade 20 side to the inner peripheral side of the support ring portion 71a. Since a more complicated bending path (labyrinth structure) is formed in this case, it is possible to reliably prevent dust from entering the inner peripheral side of the support ring portion 71a.
  • each embodiment described above can be further modified.
  • the configuration in which the inclined surface 25d is provided in the recess 25c and the ring spring 31 is displaced in the diameter increasing direction is exemplified, but instead of or in addition to the retaining ring 19 side or the washer 19a side. It is good also as a structure which provides an inclined surface and displaces the ring spring 31 as an elastic member more reliably in a diameter expansion direction.
  • the configuration in which the ring spring 31 is interposed between the front end face (recess 25c) of the support ring portion 25b and the retaining ring 19 as the front axial direction restricting portion is exemplified.
  • the ring spring 31 may be interposed between the rear end face of the support ring portion 25b and the rear axial restriction portion 17b.
  • FIGS. Such a configuration is shown in FIGS.
  • the dust-proof structure 80 shown in FIG. 9 has a configuration in which a concave portion 81 is provided on the rear surface of the support ring portion 25 b and the mouth corner portion 81 a of the concave portion 81 is pressed against the flat surface 82 a of the elastic member 82.
  • the dustproof structure 30 of the first embodiment is configured on the front side of the support ring portion 25b.
  • the flat surface 82a (inclined surface) of the elastic member 82 is pressed between the support ring portion 25b and the axial direction restricting portion 17b, so that the elastic member 82 is displaced in the diameter increasing direction.
  • the dust intrusion path to the inner peripheral side of the support ring portion 25b is reliably blocked, and a smooth opening / closing operation of the movable cover 25 can be ensured.
  • the flat surface 82a of the elastic member 82 functions as an inclined surface for displacing the elastic member 82 in the diameter expansion direction.
  • an annular wall portion 91 projecting rearward is provided on the rear surface of the support annular portion 25 b, and the wall portion 91 is an inclined surface for displacing the elastic member 92 in the diameter increasing direction. 91a is provided.
  • the elastic member 92 is accommodated in the recessed part 93 provided in the axial direction control part 17b. Also by this dustproof structure 90, the elastic member 92 is displaced in the diameter increasing direction by being pressed between the inclined surface 91a on the support annular portion 25b side and the concave portion 93 on the axial direction restricting portion 17b side.
  • a stepped concave portion obtained by removing the outer peripheral side wall portion 94 (the portion shown on the left side of the broken line in FIG. 10) of the concave portion 93 may be used.
  • a pressing surface against the inclined surface 25d of the ring spring 31 is formed on the flat surface 31a and pressed in a surface contact state, and a retaining ring 19 (washer) as an axial direction restricting portion of the ring spring 31 is formed.
  • each illustrated dustproof structure is a cutting machine with respect to the cutting material fixed on the table.
  • the present invention can be similarly applied to a table-type cutting machine that lowers the main body and cuts the cutting blade.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
PCT/JP2010/069809 2009-11-30 2010-11-08 切断機における可動カバー支持部の防塵構造 Ceased WO2011065214A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10833061.4A EP2508285B1 (en) 2009-11-30 2010-11-08 Dustproof structure for movable support section in cutting machine
CN201080058138.7A CN102665984B (zh) 2009-11-30 2010-11-08 切割机的可动罩支承部的防尘结构
US13/510,457 US8813375B2 (en) 2009-11-30 2010-11-08 Dust-proof structure of movable cover supporting portion of cutting machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009271534A JP5501743B2 (ja) 2009-11-30 2009-11-30 切断機における可動カバー支持部の防塵構造
JP2009-271534 2009-11-30

Publications (1)

Publication Number Publication Date
WO2011065214A1 true WO2011065214A1 (ja) 2011-06-03

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PCT/JP2010/069809 Ceased WO2011065214A1 (ja) 2009-11-30 2010-11-08 切断機における可動カバー支持部の防塵構造

Country Status (5)

Country Link
US (1) US8813375B2 (enExample)
EP (1) EP2508285B1 (enExample)
JP (1) JP5501743B2 (enExample)
CN (1) CN102665984B (enExample)
WO (1) WO2011065214A1 (enExample)

Families Citing this family (4)

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JP2014079874A (ja) * 2012-09-26 2014-05-08 Makita Corp 動力工具
WO2018131218A1 (ja) * 2017-01-10 2018-07-19 株式会社マキタ 結束機
DE102020100574B4 (de) 2020-01-13 2024-02-08 Festool Gmbh Führungsschiene zum Führen einer Hand-Werkzeugmaschine
CN112385425A (zh) * 2020-12-01 2021-02-23 格力博(江苏)股份有限公司 电动工具

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Also Published As

Publication number Publication date
JP2011110685A (ja) 2011-06-09
US8813375B2 (en) 2014-08-26
EP2508285A1 (en) 2012-10-10
US20120240416A1 (en) 2012-09-27
CN102665984A (zh) 2012-09-12
EP2508285A4 (en) 2015-07-29
CN102665984B (zh) 2014-07-16
EP2508285B1 (en) 2018-01-03
JP5501743B2 (ja) 2014-05-28

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