JP6431446B2 - Dust collecting cover of cutting machine - Google Patents

Description

  The present invention relates to a dust collecting cover of a cutting machine (cutter) used for cutting work such as cutting or grooving of stone or concrete blocks or cutting of asphalt road surface.

  In this type of cutting operation, a large amount of dust is generated from the cutting site. In order to maintain a good working environment, it is necessary to prevent the generated dust from scattering around. For this reason, when performing this kind of cutting work, a dust collecting cover is attached to a cutting machine. Techniques relating to such a dust collection cover are disclosed in the following patent documents.

  Patent Document 1 discloses a dust collection cover in which a cutting machine provided with a rotary cutter such as a diamond cutter is supported so as to be movable up and down with respect to a fixed cover supported on a base that is brought into contact with a cutting surface. According to this dust collecting cover, the rotary blade is moved downward in the fixed cover so as to protrude toward the lower surface of the base, and the protruding portion is cut into the cut surface to perform processing such as grooving or cutting. This form of cutting is also referred to as plunge cut.

  Patent Document 2 discloses a dust collection cover used for the same type of cutting machine, but supports a main body cover attached with a cutting machine so that it can move up and down with respect to a fixed cover supported on a base that is in contact with the cutting surface. A double-structured dust collection cover is disclosed. In the case of such a double-structure dust collecting cover, the cutting machine is moved down together with the main body cover to project the rotary blade toward the lower surface of the base, and this projecting part is cut into the cut surface to perform grooving and the like. Can do. According to such a double-structure dust collection cover, the main body cover is overlapped around the fixed cover, so that the dust collection cover seals around the blade edge (dust generation site) in the entire vertical movement range of the rotary blade. Higher sealing performance (dust collection power) than the former dust collection cover can be achieved.

JP 2007-30314 A US Patent Application Publication No. 2008/0244910

  However, according to the above conventional dust collecting cover, it is not possible to finely adjust the depth of cut with respect to the cut surface of the rotary blade, and it is necessary to improve on this point. The present invention relates to a dust collection cover used in a cutting machine called a plunge cutter, and is a double-structure dust collection cover that covers a periphery of a cutting site with a fixed cover and a main body cover. The purpose is to improve the workability of the cutting machine by enabling fine adjustment of the cutting depth.

  The above-described problems are solved by the following inventions. A first invention is a dust collection cover that covers the periphery of a rotary blade of a cutting machine, and includes a fixed cover having a base that comes into contact with the cutting surface, and a main body cover to which the cutting machine is attached. The fixed cover and the main body cover Is a dust collection cover that is coupled to be openable and closable via a pivotal support shaft at the front in the direction in which cutting proceeds. In the first invention, between the fixed cover and the main body cover, the opening / closing angles in the closing direction of both covers can be positioned at a plurality of positions to adjust the cutting depth with respect to the cut surface of the rotary blade.

  According to the first aspect of the present invention, it is possible to finely adjust the cutting depth with respect to the cutting surface of the rotary blade by positioning the opening and closing angles in the closing direction of the fixed cover and the main body cover at a plurality of positions. Thereby, workability | operativity of a cutting machine can be improved.

  According to a second invention, in the first invention, a depth adjustment stopper is provided on one of the fixed cover and the main body cover so that the position of the cover can be changed, and the other is brought into contact with the depth adjustment stopper to close the covers. This is a dust collection cover that can be positioned at a plurality of positions.

  According to the second invention, the cutting depth of the rotary blade is regulated by the depth adjustment stopper. By changing the position of the depth adjustment stopper, the cutting depth can be finely adjusted.

  3rd invention is a dust collection cover provided in the 2nd invention so that position change was possible in the inside of the groove part provided along the circular arc centering on a rotation spindle.

  According to the third invention, the depth adjustment stopper is always brought into contact with the other of the fixed cover and the main body cover, which are coupled to each other so as to be rotatable, and the cut depth is regulated. For this reason, the other weight of the other of the fixed cover and the main body cover is received by the depth adjustment stopper, and the rotation operation in the closing direction is stably regulated.

  According to a fourth aspect, in the third aspect, the depth adjustment stopper includes a stopper frame capable of changing a position in the groove portion, and a plurality of engagements provided on one wall portion of the groove portion so as to be movably supported by the stopper frame. A stopper member that engages and disengages with the mating recess is provided. In the fourth invention, the stopper member is spring-biased in the engaging direction with respect to the engaging recess.

  According to the fourth aspect of the present invention, the stopper member is held in the engaged state with respect to the engaging recess by the spring biasing force, so that the stopper frame is fixed so as not to move in the groove, thereby adjusting the depth adjusting stopper. The position is maintained and the position shift due to vibration or the like is prevented.

  In a fifth aspect based on the fourth aspect, the depth adjusting stopper is configured such that the stopper frame is tilted with the engaging portion of the stopper member with respect to the engaging concave portion as a fulcrum, and the corner portion is brought into contact with the other wall portion of the groove portion. This is a dust collection cover configured to position the other of the fixed cover or the main body cover in the closing direction by being brought into contact.

  According to the fifth aspect of the present invention, the stopper frame receives the other weight of the fixed cover and the main body cover and tilts around a fulcrum (engagement portion with respect to the engagement recess of the stopper member) different from the rotation support shaft. The corner portion of the stopper frame is engaged so as to bite into the other wall portion of the groove portion curved along the arc centering on the rotation support shaft, thereby locking the position of the stopper frame. The rotation operation in the closing direction of the fixed cover and the main body cover is restricted, and as a result, the adjustment state of the cutting depth of the rotary blade is reliably maintained.

  In a sixth aspect based on any one of the third to fifth aspects, the fixed cover and the main body cover are urged toward each other in the opening direction by a compression spring. The compression spring is held along a circular arc centered on the rotation support shaft by a spring holder attached to one of the fixed cover and the main body cover. In the sixth aspect of the invention, the spring holder restricts the removal of the depth adjustment stopper from the groove.

  According to the sixth aspect of the present invention, the mounting state of the depth adjusting stopper in the groove portion is maintained by utilizing the spring holder that holds the compression spring. For this reason, a special member for holding the depth adjustment stopper in the groove portion can be omitted, and the configuration of the depth adjustment stopper can be simplified.

  7th invention is a cutting machine provided with the dust collection cover which concerns on any 1st invention of 1st-6th.

  According to the seventh invention, the above-mentioned effect can be obtained for the cutting machine attached with the dust collecting cover according to any one of the first to sixth inventions, thereby improving the workability of the cutting machine. Can be increased.

It is a front view of the dust collecting cover which concerns on this embodiment, Comprising: It is a side view on the right side toward the direction which cutting | disconnection advances. In this figure, the main body cover is shown in a state of being located at the descending end. It is a longitudinal cross-sectional view of a dust collection cover. In this figure, the main body cover is shown in a state of being located at the descending end. It is a front view of a dust collection cover. In this figure, the main body cover is shown opened and returned to the regulation angle. It is a longitudinal cross-sectional view of a cutting machine. In this figure, the main body cover is shown opened and returned to the regulation angle. It is (V) arrow directional view of FIG. 1, Comprising: It is a top view of a dust collection cover and a cutting machine. It is (VI) arrow view of FIG. 1, Comprising: It is a bottom view of a dust collection cover and a cutting machine. It is a (VII) arrow directional view of FIG. 5, Comprising: It is a rear view of a dust collection cover and a cutting machine. FIG. 8 is a front view of the dust collecting cover and the cutting machine, as viewed from the arrow (VIII) of FIG. 7. It is (IX) arrow directional view of FIG. 7, Comprising: It is a rear view of a dust collecting cover and a cutting machine. It is a cross-sectional view of a cutting machine and a dust collecting cover. It is the figure which looked at the dust collection cover from the back side. In this figure, the front part of the dust collecting cover is shown by a cross section along line (XI)-(XI) in FIG. In this figure, the entire separation lock member is visible. It is the figure which looked at the dust collection cover from the back side. In this figure, the state which opened the main body cover from the state shown in FIG. 11 is shown. It is the figure which looked at the dust collection cover from the back side. In this figure, the state which operated the isolation | separation locking member to the unlocking side from the state shown in FIG. 12 is shown. It is the figure which looked at the dust collection cover from the front side. In this figure, the fixed stopper and its periphery are shown in a longitudinal sectional view. In this figure, the cutting machine is shown in a removed state. It is the longitudinal cross-sectional view which looked at the dust collecting cover from the front side, Comprising: It is the (XV)-(XV) sectional view taken on the line of FIG. This figure shows a state in which the main body cover is completely closed with respect to the fixed cover (lower end position). In this figure, the cutting machine is shown in a removed state. It is the longitudinal cross-sectional view which looked at the dust collection cover from the front side. This figure has shown the state which opened the main body cover upwards from the state shown in FIG. In this figure, the cutting machine is shown in a removed state. It is the longitudinal cross-sectional view which looked at the dust collection cover from the front side. This figure shows a state in which the fixed stopper is unlocked. In this figure, the cutting machine is shown in a removed state. It is the longitudinal cross-sectional view which looked at the dust collection cover from the front side. This figure has shown the state which locked the fixed stopper. In this figure, the cutting machine is shown in a removed state.

  Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1-7, the dust collecting cover 20 of this embodiment is attached to the cutting machine 2 used for cutting operations, such as cutting and grooving of stone materials or concrete blocks, or cutting of asphalt road surfaces, for example. Therefore, it is used mainly for the purpose of preventing scattering of dust generated by cutting work. The cutting machine 2 may be the same as the conventional configuration, and no particular change is required in the present embodiment. Hereinafter, the cutting machine 2 will be briefly described.

  FIG. 10 shows the internal structure of the cutting machine 2. The cutting machine 2 is supported on the back side of the dust collecting cover 20. The cutting machine 2 has a configuration equivalent to that of a disc grinder, and has a configuration in which an electric motor 4 is housed in a cylindrical main body housing 3. A gear head 5 is coupled to the front portion of the main body housing 3. As shown in FIGS. 1 to 7, a handle portion 6 held by a user is coupled to the rear portion of the main body housing 3. A switch lever 6 a is provided on the lower surface of the handle portion 6. When the switch lever 6a is pulled upward with the fingertip of the hand holding the handle portion 6, the electric motor 4 is activated. A power cord 7 for power supply is drawn out from the rear portion of the handle portion 6.

  As shown in FIG. 10, the drive gear 4 a formed on the output shaft of the electric motor 4 is meshed with a bevel gear as the driven gear 8. The driven gear 8 is coupled to the spindle 9. The spindle 9 is supported so as to be rotatable about an axis perpendicular to the output shaft of the electric motor 4. The spindle 9 is rotatably supported by the gear head housing 10 via bearings 11 and 12. The tip of the spindle 9 protrudes from the gear head housing 10 into the dust collection cover 20. A circular rotary blade 15 is attached to the protruding portion. The rotary blade 15 is a blade called a diamond wheel, and rotates in the counterclockwise direction as shown by a white arrow in FIG. The rotary blade 15 is sandwiched between the inner flange 13 and the outer flange 14 and is fixed to the screw shaft portion 9 a of the spindle 9. The rotary blade 15 can be removed from the spindle 9 by removing the screw connection of the outer flange 14 to the screw shaft portion 9a.

  A bearing 12 that rotatably supports the spindle 9 is held by a bearing holder 16. The bearing holder 16 is fixed to the opening of the gear head housing 10. The dust cover 20 is coupled to the cutting machine 2 by fastening the clamp portion 17 to the outer periphery of the bearing holder 16. As will be described later, the cutting machine 2 is coupled to the main body cover 23 of the dust collection cover 20. The cutting machine 2 is coupled to the back side (outer wall portion 23L) of the main body cover 23 in a sideways posture in which the axis (output axis) of the spindle 9 is aligned in the left-right direction.

  As shown in FIGS. 7 to 9, a front grip 18 is provided on the upper surface of the gear head housing 10. The user can hold the cutting machine 2 in a stable posture by holding the handle 6 with one hand and holding the front grip 18 with the other hand. And can be done quickly.

  The dust collecting cover 20 has a main function of preventing the dust generated at the cutting portion C from being scattered around by shielding the left and right sides of the rotary blade 15 and the upper circumferential direction. As shown in FIG. 2, a steel plate base 21 to be brought into contact with the cut surface W, a resin fixed cover 22 fixed to the base 21, and a main body cover 23 supported so as to be rotatable up and down with respect to the fixed cover 22. It has. The main body cover 23 is supported by the fixed cover 22 so as to be vertically rotatable via a rotation support shaft 24. The rotation support shaft 24 is supported so as to be rotatable in the left-right width direction in the vicinity of the front end portion of the base 21. The rotation support shaft 24 is used as an axle of the front wheel 25. Front wheels 25 are attached to the left and right ends of the pivot shaft 24, respectively. The left and right front wheels 25 are in contact with the cut surface W, respectively.

  A rear wheel shaft 26 is supported near the rear end of the base 21. The rear wheel shaft 26 is parallel to the rotation support shaft 24 and is rotatably supported across the left-right width direction. Rear wheels 27 are attached to the left and right ends of the rear rear wheel shaft 26, respectively. The left and right rear wheels 27 are also in contact with the cut surface W. The base 21 is grounded by the left and right front wheels 25 and the left and right rear wheels 27 in a state where the base 21 is slightly floated with respect to the cut surface W, and can thereby move smoothly along the cut surface W. As shown in FIGS. 2 and 6, a rectangular window portion 21 a is provided at the center of the base 21. The lower part of the rotary blade 15 is projected to the lower surface side of the base 21 through the window portion 21a.

  The fixed cover 22 fixed to the upper surface of the base 21 rises from the left and right sides of the window portion 21a and covers the left and right sides of the rotary blade 15 and mainly the rear portions of the left and right inner wall portions 22L and 22R. An inner peripheral edge 22E that covers the periphery mainly of the rear side of the rotary blade 15 by connecting the sides to each other is provided. The main body cover 23 to which the cutting machine 2 is attached is formed between the left and right outer wall portions 23L and 23R located outside the left and right inner wall portions 22L and 22R of the fixed cover 22 and the edges of the left and right outer wall portions 23L and 23R. Are connected to each other to have an outer peripheral edge 23E that covers the upper half of the rotary blade 15. As shown in FIGS. 10, 12, 13, 15, and 16, a relief portion 22 c for allowing the spindle 9 of the cutting machine 2 to pass through is provided on the inner wall portion 22 </ b> L on the left side of the fixed cover 22. The relief portion 22 c is provided in a state of being curved along an arc centered on the rotation support shaft 24. The escape portion 22c is opened at the top of the inner wall portion 22L.

  The outer wall 23R and the outer peripheral edge 23E on the right side (front side) of the main body cover 23 are manufactured by resin molding. A steel plate is used for the outer wall portion 23 </ b> L on the left side (back side) of the main body cover 23. As shown in FIG. 7, the outer side wall portion 23L on the back side is coupled to the left end edge of the resin outer peripheral edge portion 23E by a plurality of fixing screws 23f. The clamp portion 17 for connecting the cutting machine 2 is connected to the left outer wall portion 23L by welding. As shown in FIG. 10, a circular relief hole 23 h is provided in the left outer wall portion 23 </ b> L of the main body cover 23 in alignment with the inner peripheral hole of the clamp portion 17. The spindle 9 protrudes inside the dust collecting cover 20 through the escape hole 23 h of the main body cover 23 and the escape portion 22 c of the fixed cover 22. The cutting machine 2 can be removed from the dust collecting cover 20 by removing the rotary blade 15 from the spindle 9 and loosening the clamp portion 17.

  The main body cover 23 is biased in a direction of rotating upward with respect to the fixed cover 22 via the compression spring 30. As shown in FIGS. 15 and 16, the compression spring 30 is an inner wall portion 22 </ b> R on the right side of the fixed cover 22, and is inside the spring holder 33 attached to the side surface opposite to the cutting machine 2 with respect to the rotary blade 15. It is held by (spring holding portion 31). The spring holder 33 is attached along an arc centered on the rotation support shaft 24 of the main body cover 23. The spring holder 33 is attached to the opposite side of the rotation support shaft 24 with respect to the rotation center (spindle 9) of the rotary blade 15. With this spring holder 33 (spring holding portion 31), the compression spring 30 has a circular arc centered on the rotation support shaft 24 in a region opposite to the rotation support shaft 24 with respect to the rotation center of the rotary blade 15. Along and stretchable.

  The spring holder 33 is fixed to the inner wall portion 22R on the right side of the fixed cover 22 with two fixing screws 33a. At the upper part of the spring holder 33, a retaining portion 33c for preventing the compression spring 30 from coming off is provided. The retaining portion 33c is provided with a pressing portion entry path 33b through which the pressing portion 32 for pressing the compression spring 30 enters. The pressing portion 32 is integrally provided on the inner surface of the right side wall portion 23 </ b> R of the main body cover 23. The pressing portion 32 is also provided in a state of being curved along an arc centered on the rotation support shaft 24.

  When the main body cover 23 is rotated up and down with respect to the fixed cover 22, the pressing portion 32 is integrally displaced up and down in the spring holder 33. When the main body cover 23 is rotated downward, the upper end portion of the compression spring 30 is pushed downward by the pressing portion 32, so that the main cover 23 is rotated upward (the fixed cover 22 is rotated downward). ) Is generated. When the main body cover 23 is rotated upward, the pressing portion 32 is integrally displaced upward, so that the compression spring 30 is extended and its urging force is gradually reduced.

  Here, for example, when the user holds the handle portion 6 and carries the cutting machine 2 together with the dust collecting cover 20, the fixed cover 22 rotates downward with respect to the main body cover 23 by the urging force of the compression spring 30. Then, the main body cover 23 is hung through the rotation support shaft 24. On the other hand, at the time of cutting work, the base 21 is brought into contact with the cutting surface W to fix the fixed cover 22, and the main body cover 23 is rotated up and down together with the cutting machine 2 with respect to the fixed cover 22. Thus, for example, when carrying and working, the reference (fixed side) of the rotation operation of the fixed cover 22 and the main body cover 23 that are coupled to each other is interchanged. In the present specification, the reference for the rotation operation is used as appropriate. Further, in this specification, with respect to the direction of the mutual rotation operation of the main body cover 23 and the fixed cover 22, the direction in which the rotary blade 15 protrudes toward the lower surface side of the base 21 is referred to as the closing direction. The direction in which the amount of protrusion to the lower surface side is reduced is called the opening direction. Therefore, the downward movement operation (the movement approaching the fixed cover 22) of the main body cover 23 is also referred to as a rotation operation in the closing direction, and the upward movement operation (an operation separating from the fixed cover 22) is also referred to as a rotation operation in the opening direction.

The main body cover 23 to which the cutting machine 2 is attached is urged in the direction of rotating upward (relative opening direction) with respect to the fixed cover 22 by the urging force of the compression spring 30. As shown in FIG. 16, an urging force is generated by pressing the pressing portion 32 against the upper end portion of the compression spring 30. As shown in FIGS. 3 and 4, when the main body cover 23 is rotated upward by a fixed angle (open restriction angle θ _{0 in} this embodiment) with respect to the fixed cover 22, the lower side of the rotary blade 15 is the lower surface side of the base 21. Is in a state where it is not protruded into the dust collecting cover 20. On the other hand, as shown in FIG. 1, when the handle portion 6 is gripped and the main body cover 23 is pushed down against the urging force of the compression spring 30, the rotary blade 15 is protruded toward the lower surface side of the base 21 and cut surface. Cut into W.

  By largely rotating the main body cover 23 upward with respect to the fixed cover 22, the pressing portion 32 can be retracted from the spring holding portion 31 via the pressing portion entry path 33b. When the pressing portion 32 is retracted from the spring holding portion 31, the compression spring 30 is further extended and the upper end portion thereof is pressed by the retaining portion 33 c, so that the compression spring 30 is held as it is along the spring holding portion 31. . For this reason, if the main body cover 23 is then rotated downward, the pressing portion 32 enters the spring holding portion 31 via the pressing portion entry path 33b, whereby the upper end portion of the compression spring 30 is pressed again and the main body cover is pressed. An urging force is generated in the direction of rotating the cover 23 upward.

As shown in FIGS. 3 and 4, when the main body cover 23 is rotated upward by a certain angle (the opening restriction angle θ _{0 in} this embodiment) with respect to the fixed cover 22, the main body cover 23 is rotated further upward. The movement is restricted by the opening stopper 40. As shown in FIG. 3, the right side wall portion 22R of the fixed cover 22 is provided with a stepped portion 22a that is one step higher. The step portion 22 a is provided so as to be curved along an arc centered on the rotation support shaft 24. An opening stopper 40 is provided at the center of the stepped portion 22a. The opening stopper 40 is cut and raised when the fixed cover 22 is molded, and has an engaging claw portion 40a at the tip. The engaging claw portion 40a engages with the engaging portion provided on the inner surface of the right side wall portion 23R of the main body cover 23 so that the fixing cover 22 is rotated relative to the main body cover 23 in the opening direction. Be regulated.

For example, when the user grips the handle portion 6 and carries the cutting machine 2 together with the dust collecting cover 20, the opening stopper 40 opens the fixed cover 22 with respect to the main body cover 23 by the opening stopper 40 and rotates in the opening direction. In a state in which the fixed cover 22 is suspended from the main body cover 23 via the rotation support shaft 24. However, even in this state, the fixed cover 22 and the main body cover 23 are open to each other up to the opening restriction angle θ _0, so that the rotary blade 15 does not protrude to the lower surface side of the base 21.

By pushing the opening stopper 40 with the fingertip, the engagement state of the engagement claw portion 40a with the engagement portion on the body cover 23 side can be released. By releasing the engagement state of the engagement claw portion 40a, a fixed cover 22 beyond the opening regulating angle theta ₀ can be further rotated in the opening direction relative to the body cover 23. By disengaging the engaging claw portion 40a of the opening stopper 40 and rotating the fixed cover 22 to the main body cover 23 further in the opening direction so as to be separated to an opening angle θ ₁ (about 45 ° in this embodiment), the main body The cover 23 and the fixed cover 22 can be separated from each other. By separating the main body cover 23 and the fixed cover 22 from each other, the rotary blade 15 can be largely exposed, and operations such as replacement of the rotary blade 15 can be easily performed.

  As shown in FIGS. 11 to 13, a support groove 23 a is provided at the front end of the main body cover 23. The support groove portion 23 a is provided symmetrically on the left and right outer wall portions 23 </ b> L and 23 </ b> R of the main body cover 23. A rotation support shaft 24 is inserted through the left and right support groove portions 23 a and the main body cover 23 is coupled to the fixed cover 22 so as to be rotatable. The left and right support groove portions 23a are cut from the front end corner portion. For this reason, the rotation support shaft 24 can be extracted from the left and right support groove portions 23a by relatively moving in the radial direction. The main body cover 23 and the fixed cover 22 can be separated from each other by extracting the rotational support shaft 24 from the left and right support groove portions 23a by relatively moving in the radial direction.

  As shown in FIGS. 11 to 13, the front end portion of the outer wall portion 23 </ b> L made of a steel plate of the main body cover 23 is a separation lock member that restricts the radial displacement (extraction) of the rotation support shaft 24 in the support groove portion 23 a. 41 is provided. The separation lock member 41 is provided so as to be tiltable up and down around the support shaft 42. A hook-shaped engagement portion 41 a is provided at the lower portion of the separation lock member 41. As shown in FIGS. 11 and 12, in a state where the engaging portion 41a is located on the lower side of the rotation support shaft 24 and closes the support groove portion 23a, the radial direction in the support groove portion 23a of the rotation support shaft 24 is increased. The displacement is regulated. By restricting the radial displacement of the rotation support shaft 24 in the support groove portion 23a, the fixed cover 22 is held in a state of being coupled to the main body cover 23 so as to be vertically rotatable.

  The separation lock member 41 is biased by a torsion spring 43 in a locking direction (a clockwise direction in FIGS. 11 to 13) that positions the engaging portion 41 a below the rotation support shaft 24. One end of the torsion spring 43 is hooked on a spring engaging portion 44 provided in a cut-and-raised shape on the outer wall portion 23L. On the upper part of the separation lock member 41, an operation unit 41b is provided for the user to press the fingertip and rotate in the unlocking direction. As shown in FIG. 13, when the fingertip is pressed against the operation portion 41b and the separation lock member 41 is tilted to the unlock side (counterclockwise in FIGS. 11 to 13) against the torsion spring 43, the engagement is achieved. The part 41a deviates from the position where the support groove part 23a is blocked.

The spring engaging portion 44 has a function as a spring hooking portion for hooking one end side of the torsion spring 43 and a function as a lever stopper for restricting the tilting range of the separation lock member 41 toward the unlocking side. doing. By this spring engaging portion 44, the tilt angle of the separation lock member 41 toward the unlock side is restricted to a fixed angle. Therefore, as shown in FIG. 13, in order to completely retract the engaging portion 41a of the separation lock member 41 from the support groove portion 23a, first, the main body cover 23 is opened by about 45 ° relative to the fixed cover 22. must be rotated to an angle (separable opening angle theta _1), thus to separate the main body cover 23 from the fixed cover 22 opens relatively about 45 ° to the body cover 23 relative to the fixed cover 22 It is a condition that it is rotated to an angle.

When the separation lock member 41 is tilted to the unlock side in a state in which the main body cover 23 is rotated in the opening direction up to the separable opening angle θ ₁ (about 45 °) with respect to the fixed cover 22, the engaging portion 41a Is completely removed from the position where the support groove 23a is blocked. When the engaging portion 41a is completely disengaged from the support groove portion 23a, the radial displacement (disengagement) of the rotation support shaft 24 in the support groove portion 23a is allowed. For this reason, the main body cover 23 or the fixed cover 22 is moved in a direction in which the rotation support shaft 24 is relatively extracted from the support groove portion 23a in a state where the separation lock member 41 is tilted to the unlock side. 23 and the fixed cover 22 can be relatively separated. When the fixed cover 22 is separated from the main body cover 23, a work window in which the screw shaft portion 9a, the outer flange 14 and the rotary blade 15 of the spindle 9 are cut out into a semicircular shape on the right outer wall portion 23R of the main body cover 23. It is exposed through the part 23S. The user can quickly and easily exchange the rotary blade 15 through the working window 23S.

  Thus, the fixed cover 22 can be separated from the main body cover 23 only by unlocking the separation lock member 41. Unless the separation lock member 41 is unlocked, the fixed cover 22 and the main body cover 23 are separated. Is locked into a combined state. Therefore, for example, when the user holds the handle portion 6 and carries the cutting machine 2 together with the dust collecting cover 20, the user opens the stopper 40 carelessly, and as a result, the fixed cover 22 against the main body cover 23 is operated. It is possible to prevent the fixed cover 22 from dropping from the main body cover 23 as it is even when it is pivoted downward.

  As shown in FIGS. 1, 3, 14 to 18, the inner wall 22 </ b> R on the right side of the fixed cover 22 regulates the lower end position (bottom dead center) of the main body cover 23 and cuts the cutting surface W of the rotary blade 15. A depth adjusting stopper 50 is provided for adjusting the depth of cut with respect to. The depth adjustment stopper 50 is provided so as to be movable in a groove portion 22 d formed between the step portion 22 a of the fixed cover 22 and the spring holder 33. The groove portion 22 d is formed along an arc centered on the rotation support shaft 24. As shown in FIGS. 14 to 18, the depth adjusting stopper 50 includes a rectangular block body-shaped stopper frame 51 and a stopper member 52 that is movably supported by the stopper frame 51. The stopper frame 51 includes a support edge portion 51a at the rear portion. The support edge portion 51 a is inserted into a support groove portion 33 d provided on the front surface of the spring holder 33. The support groove 33 d of the spring holder 33 extends vertically along the front surface (curved inner peripheral surface) of the spring holder 33 that is curved. The stopper frame 51 and thus the depth adjusting stopper 50 are movably supported within the support groove 33d within a range in which the support edge 51a can move. By positioning the support edge portion 51 a of the stopper frame 51 in the support groove portion 33 d of the spring holder 33, the removal from between the step portion 22 a of the depth adjustment stopper 50 and the spring holder 33 is prevented.

  The stopper member 52 is supported so as to be movable with respect to the stopper frame 51 along the radial direction of the rotation support shaft 24. The stopper member 52 is urged in a direction in which a tip end thereof is projected forward by a compression spring 53 interposed between the stopper member 52 and the bottom of the stopper frame 51. An engagement recess 22b is provided in the front part of the depth adjustment stopper 50 and at the rear part of the step part 22a serving as the front side wall part of the groove part 22d. As illustrated, a plurality of engaging recesses 22b are provided along the rear portion of the stepped portion 22a. In the case of this embodiment, the plurality of engaging recesses 22b are provided at approximately equal intervals. When the distal end portion of the stopper member 52 is protruded by the compression spring 53 and is fitted into any of the engaging recesses 22b, the depth adjusting stopper 50 is fixed so as not to be displaced vertically. When the user moves the stopper member 52 backward with the fingertip against the compression spring 53, the tip can be retracted from the engagement recess 22b. By retracting the stopper member 52 with the fingertip, the stopper frame 51 and thus the depth adjusting stopper 50 can be moved up and down. The position of the depth adjusting stopper 50 can be fixed by fitting the tip end of the stopper member 52 into the engaging recess 22b by the urging force of the compression spring 53 at an arbitrary position moved up and down.

  When the main body cover 23 is rotated downward, the stopper contact portion 23b set at the lower end portion of the groove portion 23e on the rear side of the working window portion 23S comes into contact with the stopper frame 51 of the depth adjustment stopper 50, The lower end position of the main body cover 23 and the cutting machine 2 is restricted. The depth adjusting stopper 50 regulates the lower end position of the cutting machine 2 and thus the rotary blade 15, so that the amount of protrusion of the rotary blade 15 from the lower surface of the base 21 is restricted. The depth of cut can be adjusted in stages. 1, 3, 14 to 18, the depth adjusting stopper 50 is fixed at a position where the tip end portion of the stopper member 52 is fitted in the lowermost engaging recess 22b. For this reason, the lower end position of the main body cover 23 is set to the lowest side, and therefore, the cutting depth with respect to the cutting surface W of the rotary blade 15 is set to the maximum. Although not shown in the figure, a scale for indicating the corresponding depth of cut is displayed together with a numerical value in each engagement recess 22b.

  As described above, the stopper frame 51 has a rectangular block shape. The inner peripheral surface of the spring holder 33 is curved in an arc shape centered on the rotation support shaft 24. On the other hand, when the stopper contact portion 23b of the main body cover 23 is brought into contact with the upper surface of the stopper frame 51, the stopper frame 51 is illustrated with the distal end side of the stopper member 52 engaged with the engagement recess 22b as a fulcrum. Tilts counterclockwise at. As a result of the stopper frame 51 tilting with the tip end side of the stopper member 52 different from the pivot shaft 24 as a fulcrum, the rear upper corner portion 51 b of the stopper frame 51 bites into the inner peripheral surface of the spring holder 33. In contact therewith, the weight of the main body cover 23 is received, whereby the lower end position of the main body cover 23 is reliably regulated, and the cutting operation can be performed quickly with an accurate cutting depth.

  In addition to the depth adjustment stopper 50 described above, the dust collection cover 20 of the present embodiment includes a fixing stopper 60 for fixing the fixed cover 22 and the main body cover 23 to each other so as not to be rotatable at an arbitrary opening / closing angle. Yes. Further, the dust collection cover 20 of the present embodiment fixes the covers 22 and 23 to each other at an arbitrary opening / closing angle in addition to the configuration in which the fixing cover 22 and the main body cover 23 can be separated from each other as described above. Therefore, it has a new and useful feature in that it includes a fixed stopper 60. As shown in FIGS. 14 to 18, the fixed stopper 60 includes a base 64, an operation member 61, and a lock pin 62. On the right outer wall portion 23R of the main body cover 23, a step cover portion 23c that covers the step portion 22a provided on the right inner wall portion 22R of the fixed cover 22 and the right inner wall portion 22R of the fixed cover 22 are provided. A holder cover portion 23d that covers the spring holding portion 31 is provided so as to rise sideways. A groove 23e that is curved in an arc shape is provided between the step cover portion 23c and the holder cover portion 23d. The groove 23 e enters the groove 22 d of the fixed cover 22. The lower end of the groove 23e is a stopper abutting portion 23b that abuts on the depth adjusting stopper 50 described above.

  The fixed stopper 60 is provided in the groove 23e. The base 64 is fixed by being fitted into the groove 23e. A slide groove is provided on the front side of the base 64. The operation member 61 is held on the base 64 so as to be slidable within a certain range up and down. A slide edge is provided on the front side of the operation member 61. The operating member 61 is supported so as to be slidable within a certain range with respect to the base 64 by causing the slide edge portion to enter the slide groove portion. The operation member 61 is urged in a direction of sliding upward by the compression spring 63. The compression spring 63 is interposed between the rear surface 61 a of the operation member 61 and a spring engaging portion 64 a provided at the lower part of the upper surface of the base 64. The operating member 61 can be slid down (locked side) with the fingertip against the compression spring 63. When the operation member 61 is slid to the lock position side, the mutual opening and closing operations of the fixed cover 22 and the main body cover 23 are locked, and the position of the rotary blade 15 is fixed.

  An operation recess 61 b is provided on the rear side surface of the operation member 61. The operation recess 61b is deeper on the lower side and gradually becomes shallower toward the upper side. A lock pin 62 is disposed opposite to the operating recess 61b. The lock pin 62 is held in a holding hole 23 g provided in the holder cover portion 23 d of the main body cover 23. The holding hole 23g is provided through the front side wall portion of the holder cover portion 23d. The lock pin 62 has a diameter larger than at least the thickness of the front side wall portion of the holder cover portion 23d. For this reason, the lock pin 62 protrudes from the front side wall portion of the holder cover portion 23d in the thickness direction.

  As shown in FIG. 18, in a state where the operating member 61 is positioned at the upper unlocked position by the urging force of the compression spring 63, the deep part below the operating recess 61 b faces the lock pin 62. For this reason, the lock pin 62 enters the deep part below the operating recess 61b and does not protrude into the holder cover portion 23d. On the other hand, when the operating member 61 is slid to the lower locking position against the urging force of the compression spring 63 as shown in FIG. 18, the shallow portion on the upper side of the operating recess 61 b faces the lock pin 62. It becomes a state. For this reason, the lock pin 62 is pushed by a shallow portion of the operating recess 61b and protrudes into the holder cover portion 23d.

  At an arbitrary relative rotation position (mutual opening angle) of the main body cover 23 with respect to the fixed cover 22, the lock pin 62 is pushed against the shallow portion of the operating recess 61b by the sliding operation of the operation member 61 to the lock position side (downward). When it is pushed inside the holder cover portion 23d, the lock pin 62 is pushed against the front surface of the spring holder 33 as shown. In this way, the lock pin 62 is firmly sandwiched between the operating recess 61b on the main body cover 23 side and the front surface of the spring holder 33 on the fixed cover 22 side. The upward rotation of the fixed cover 22 is restricted, and the covers 22 and 23 are locked at an arbitrary opening angle. Further, the operation member 61 is held in the locked position by the biting of the lock pin 62.

  The fixed stopper 60 is the amount of protrusion of the rotary blade 15 from the lower surface of the base 21 and has a function of adjusting the cutting depth with respect to the cutting surface W, like the depth adjustment stopper 50. The depth adjustment stopper 50 has a function of adjusting the cutting depth in a stepwise manner. However, according to the fixed stopper 60, the rotary blade 15 can be fixed at an arbitrary cutting depth.

  The cutting depth set by the depth adjustment stopper 50 functions as an upper limit of the cutting depth when the main body cover 23 is moved downward to gradually increase the cutting depth with respect to the cutting surface W of the rotary blade 15. On the other hand, the cutting depth set by the fixed stopper 60 is a cutting in which the rotary blade 15 is protruded from the lower surface side of the base 21 by a certain amount from the beginning, and the protruding portion is cut from the end of the cutting surface W. It functions effectively with respect to a cutting configuration that does not involve the downward movement of the main body cover 23.

  When the operation member 61 held in the locked position is pushed upward, the biting state (locked state) of the lock pin 62 with respect to the shallow portion of the operating recess 61 b is released, and the operation member 61 is moved by the biasing force of the compression spring 63. Return to the upper unlocked position.

  A dust collection port 70 for connecting the dust collector CL is provided at the rear part of the main body cover 23. The dust collector CL is connected to the dust collection port 70 via the dust collection hose H. Dust generated at the cutting site C is blown upward in the dust collection cover 20 by the swirling air generated by the rotation of the rotary blade 15, and then forcibly collected by the dust collector CL to prevent scattering to the surroundings.

  According to the dust collection cover 20 of the present embodiment configured as described above, the depth adjustment stopper 50 is interposed between the fixed cover 22 and the main body cover 23. The depth adjustment stopper 50 restricts the position of the lower end of the main body cover 23 relative to the fixed cover 22 and the rotational end position in the closing direction. By restricting the lower end position of the main body cover 23, the depth of cut with respect to the cutting surface W of the rotary blade 15 is restricted. Since the depth adjustment stopper 50 can be adjusted to a plurality of positions, the cutting depth of the rotary blade 15 can be finely adjusted, thereby improving the workability of the cutting machine.

  The depth adjustment stopper 50 is held in position by the compression spring 53 engaging the tip of the stopper member 52 with the engagement recess 22b. This prevents the adjustment position of the depth adjustment stopper 50 from being displaced due to vibration or the like. The depth adjustment stopper 50 can be quickly and easily adjusted by retracting the stopper member 52 against the compression spring 53.

  Furthermore, the depth adjustment stopper 50 of the present embodiment is provided so that the position of the inside of the groove portion 22d provided along an arc centered on the rotation support shaft 24 can be changed. For this reason, even if the depth adjustment stopper 50 is moved to any position, the same portion (stopper contact portion 23b) of the main body cover 23 is placed with respect to the depth adjustment stopper 50 (the upper surface of the stopper frame 51). It can be made to contact. As a result, the depth adjustment stopper 50 receives the impact of the weight of the main body cover 23 and the downward movement thereof, and can stably regulate the rotation operation of the main body cover 23 in the closing direction.

  According to the illustrated depth adjustment stopper 50, the stopper frame 51 receives the weight of the main body cover 23 and tilts around a fulcrum (the tip end side of the stopper member 52) different from the rotation support shaft 24. The rear upper corner 51b of the stopper frame 51 is engaged so as to bite into the inner peripheral surface of the spring holder 33 that is curved along an arc centered on the rotation support shaft 24. The position is locked, and the lower end position of the main body cover 23 is restricted. From this, the positioning state of the lower end position of the main body cover 23 is reliably maintained by a simple configuration using the biting operation of the rear upper corner portion 51b of the stopper frame 51, and as a result, the adjustment state of the cutting depth of the rotary blade Is reliably maintained.

  The depth adjustment stopper 50 is supported so as to be movable along the groove portion 22d in a state where the support edge portion 51a of the stopper frame 51 is inserted into the support groove portion 33d. The support groove portion 33d is formed between the spring holder 33 and the right side wall portion 22R by attaching the arc-shaped spring holder 33 to the right side wall portion 22R of the fixed cover 22. From this, the depth adjustment stopper 50 can be assembled in the groove 22d by assembling the spring holder 33 to the right side wall 22R of the fixed cover 22. Thus, since the depth adjustment stopper 50 is assembled using the spring holder 33, as compared with a configuration in which the depth adjustment stopper 50 is assembled so as not to be detached from the groove 22d using a separate special member. The assembly structure of the depth adjustment stopper 50 can be simplified.

  Various modifications can be made to the embodiment described above. For example, the configuration in which the depth adjustment stopper 50 that restricts the lower end position of the main body cover 23 is provided on the fixed cover 22 side is illustrated. Conversely, the depth adjustment stopper can be adjusted to a plurality of positions on the main body cover 23 side. The lower end position of the main body cover 23 is regulated by making a fixed portion on the fixed cover 22 side relatively contact with the depth adjustment stopper on the main body cover side, and the cutting depth of the rotary blade 15 is finely adjusted. It is good also as a structure which can be adjusted.

  Moreover, although the depth adjustment stopper 50 illustrated the structure arrange | positioned in the groove part 22d between the level | step-difference part 22a of the fixed cover 22, and the spring holding | maintenance part 31, it is the inner peripheral side rather than the level | step-difference part 22a, or the spring holding | maintenance part 31. It is good also as a structure arrange | positioned rather than the outer peripheral side.

  Further, a depth adjustment stopper 50 is disposed in the groove portion 22d provided in the right side wall portion 22R of the fixed cover 22, and the stopper member 52 is engaged with the engagement recess portion 22b provided in the inner peripheral side wall portion of the groove portion 22d. However, the depth adjusting stopper is positioned at a plurality of positions by providing an engaging pin spring-biased on the lock side of the stopper frame and inserting / removing the engaging pin with respect to the bottom of the groove 22d. Also good.

  In addition, as a configuration for adjusting the cutting depth with respect to the cutting surface W of the rotary blade 15 in a plurality of stages, for example, a plurality of engagement holes are formed in the right side wall portion 22R of the fixed cover 22 around the rotation support shaft 24. It is good also as a structure which regulates the descent | fall end position of a main body cover with the stopper member which is provided along the circular arc path | route and is inserted and hold | maintained in one of the engagement holes.

W ... Cut surface C ... Cut part CL ... Dust collector, H ... Dust collector hose 2 ... Cutter 3 ... Main body housing 4 ... Electric motor 4a ... Drive gear 5 ... Gear head 6 ... Handle, 6a ... Switch lever 7 ... Power cord DESCRIPTION OF SYMBOLS 8 ... Drive gear 9 ... Spindle, 9a ... Screw shaft part 10 ... Gear head housing 11, 12 ... Bearing 13 ... Inner flange 14 ... Outer flange 15 ... Rotary blade 16 ... Bearing holder 17 ... Clamp part 18 ... Front grip 20 ... Dust collection Cover 21 ... Base, 21a ... Window portion θ ₀ ... Opening restriction angle θ ₁ ... Separable opening angle 22 ... Fixed cover 22L ... Inner side wall (left side), 22R ... Inner side wall (right side), 22E ... Inner peripheral edge 22a ... Step part, 22b ... engagement recess, 22c ... relief part, 22d ... groove part 23 ... main body cover 23L ... outer wall part (left side), 23R ... outer wall part (right side), 23 E ... Outer peripheral edge 23S ... Work window 23a ... Support groove 23b ... Stopper contact 23c ... Step cover 23d ... Holder cover 23e ... Groove 23f ... Fixing screw 23g ... Holding hole 23h ... Relief Hole 24 ... Rotating support shaft 25 ... Front wheel 26 ... Rear wheel shaft 27 ... Rear wheel 30 ... Compression spring 31 ... Spring holding part 32 ... Pressing part 33 ... Spring holder 33a ... Fixing screw, 33b ... Pressing part entry path, 33c ... Drilling Stop part, 33d ... support groove part 40 ... opening stopper, 40a ... engagement claw part 41 ... separation lock member, 41a ... engagement part, 41b ... operation part 42 ... support shaft 43 ... torsion spring 44 ... spring engagement part 50 ... Depth adjustment stopper 51 ... Stopper frame 51a ... Support edge, 51b ... Upper rear corner 52 ... Stopper member 53 ... Compression spring 60 ... Fixed stopper 61 ... Operating member, 61a ... Rear surface, 61b ... Operating recess 62 The lock pin 63 ... compression spring 64 ... base, 64a ... spring engaging portion 70 ... dust collection port

Claims (7)

A dust collecting cover covering the periphery of the rotary blade of the cutting machine,
A fixed cover having a base to be brought into contact with the cutting surface, and a main body cover to which the cutting machine is attached,
The fixed cover and the main body cover are coupled so as to be openable and closable with respect to each other via a rotation support shaft at a front portion in a direction in which cutting proceeds.
Between the side part of the fixed cover covering the side of the rotary blade and the side part of the main body cover covering the side of the rotary blade , the opening / closing angles in the closing direction of both covers are positioned at a plurality of positions. A dust collection cover provided with a depth adjusting stopper that enables adjustment of a cutting depth of the rotary blade with respect to the cut surface. 2. The dust collection cover according to claim 1, wherein the depth adjustment stopper is provided in one of the fixed cover and the main body cover so that the position of the depth adjustment stopper can be changed, and the other cover is brought into contact with the depth adjustment stopper. A dust collection cover that can be opened and closed at multiple positions. The dust collection cover according to claim 2, wherein the depth adjustment stopper has a depth in a direction away from the other side portion on one side portion of the fixed cover or the main body cover, and A dust collection cover provided so that the position in a groove provided along an arc centering on a rotation support shaft can be changed.   4. The dust collection cover according to claim 3, wherein the depth adjustment stopper is provided on one wall portion of the groove portion, the stopper frame capable of changing the position in the groove portion, and supported by the stopper frame so as to be movable. A dust collecting cover provided with a stopper member that engages and disengages with respect to the plurality of engaging recesses, and the stopper member is spring-biased in the direction of engagement with the engaging recesses.   5. The dust collection cover according to claim 4, wherein the depth adjusting stopper is configured such that the stopper frame is tilted with an engaging portion of the stopper member with respect to the engaging recess as a fulcrum, and a corner portion of the depth adjusting stopper is the other of the groove portions. A dust collecting cover configured to be in contact with a wall portion of the main body cover and to position the other of the fixed cover or the main body cover in the closing direction.   6. The dust collection cover according to claim 3, wherein the fixed cover and the main body cover are urged toward each other in a direction of opening by a compression spring, and the compression spring includes the fixed cover. Alternatively, the spring holder attached to one of the main body covers is held along an arc centered on the rotation support shaft, and the spring holder restricts the detachment of the depth adjustment stopper from the groove. Dust collection cover. The cutting machine provided with the dust collection cover described in any one of Claims 1-6.

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