JP6704787B2 - Cutting machine dust cover - Google Patents

Description

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

In this type of cutting work, 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. Therefore, when performing this type of cutting work, the dust collecting cover is attached to the cutting machine. The technology relating to such a dust collecting cover is disclosed in the following patent documents.

Patent Document 1 discloses a dust collecting cover in which a cutting machine equipped with a rotary blade such as a diamond cutter is supported so as to be vertically movable with respect to a fixed cover supported on a base that abuts a cutting surface. According to this dust collecting cover, the rotary cutting tool is moved downward in the fixed cover to project it to the lower surface side of the base, and the projecting portion is cut into the cut surface to perform processing such as grooving or cutting. The cutting process of such a form is also called a plunge cut.

In Patent Document 2, a dust collecting cover used in the same type of cutting machine is used, but a main body cover with a cutting machine is supported so as to be vertically movable with respect to a fixed cover supported on a base that abuts the cutting surface. A dual structure dust collecting cover is disclosed. In the case of such a double-structured dust collecting cover, lower the cutting machine together with the main body cover to project the rotary blade to the lower surface of the base, and cut this projected portion into the cutting surface to perform groove cutting etc. You can According to the dust collecting cover having such a double structure, since the main body cover is overlapped around the fixed cover, the dust cover of the rotary blade is completely sealed around the blade edge (dust generating portion) with respect to the entire vertical movement range. With respect to the performance, it is possible to realize a higher airtightness (dust collecting power) than the former dust collecting cover.

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

However, it was necessary to further improve the latter dust collecting cover having the double structure. In the case of the conventional configuration disclosed in Patent Document 2, there is a problem in that the workability of exchanging the cutting tool is poor as a result of ensuring high airtightness. In the case of a normal dust collecting cover of this type, it is necessary to raise the cutting machine to expose the mounting portion (spindle tip portion) of the rotary blade, but it is possible to secure a sufficient working area (exposed area) in the past. It was difficult, and the work of attaching and detaching the blade using a hexagon wrench or spanner was troublesome.

Conventionally, in order to improve workability of cutting tools, a fixed cover is separated from the main body cover side, and a work has been provided in which the workability of cutting tools is improved by largely exposing the rotary cutting tool. When carrying the dust cover together with the cutting machine, there were insufficient measures to prevent the fixed cover from being inadvertently separated from the main body cover side.

SUMMARY OF THE INVENTION The present invention is a dust collecting cover in which a body cover and a fixed cover, which are rotatably coupled to each other, can be separated, mainly for the purpose of improving workability of cutting tools, so that careless separation of both covers is prevented. The purpose is to take reliable measures.

The problems described above are solved by the following inventions. A first aspect of the present invention is a dust collecting cover that covers a periphery of a rotary blade of a cutting machine, the dust collecting cover including a fixed cover having a base that abuts a cutting surface, and a main body cover to which the cutting machine is attached. .. In the first aspect of the invention, the main body cover and the fixed cover are rotatably supported with respect to each other via the rotation support shaft at the front part in the cutting direction. According to the first aspect of the invention, the separation lock member provided on the main body cover can be unlocked to be separated from each other.

According to the first invention, the main body cover and the fixed cover cannot be separated from each other unless the separation lock member is unlocked. For this reason, the main body cover and the fixed cover are not inadvertently separated, for example, when carrying. By unlocking the separation lock member to separate the fixed cover from the main body cover, it is possible to quickly and easily attach and remove the rotary blade.

A second aspect of the present invention is the dust collecting cover according to the first aspect of the present invention, which includes an opening stopper, which is provided between the main body cover and the fixed cover, for restricting a rotational movement in a mutual opening direction.

According to the second aspect of the present invention, both the separation lock member and the opening stopper more reliably prevent accidental separation of the main body cover and the fixed cover.

In a third aspect based on the second aspect, the opening stopper is released, the fixed cover and the main body cover are rotated to a larger opening angle, and they are separable from each other by an unlocking operation of the separation lock member. It is a dust cover.

According to the third aspect, the opening stopper is released, the main body cover and the fixed cover are further rotated in the opening direction, and they can be separated from each other by the unlocking operation of the separation lock member. For this reason, in order to separate the main body cover and the fixed cover from each other, it is necessary to release the opening stopper and unlock the separation lock member. Can be prevented.

In a fourth aspect based on any one of the first to third aspects, at least one of the fixed cover and the main body cover is provided with a support groove portion through which the rotation support shaft is inserted, and an end portion of the support groove portion. The dust collecting cover is configured such that the fixed cover and the main body cover can be separated from each other by opening the opening to separate the rotating shaft from the inside of the support groove portion.

According to the fourth aspect of the invention, the main cover and the fixed cover can be separated from each other by opening the end of the support groove, and the main cover and the fixed cover are inseparable from each other by closing the end of the support groove. Can be locked. As a result, the main body cover and the fixed cover can be quickly switched between the separable state and the non-separable coupled state by a simple operation, the workability of the rotary blade change can be improved, and the dust cover can be replaced. The usability of can be improved.

A fifth aspect of the invention is the assembly according to the fourth aspect of the invention, in which the fixed cover and the main body cover are supported inseparably from each other by closing the support groove portion with a separation lock member to restrict the separation of the rotation support shaft. It is a dust cover.

According to the fifth invention, the separable state and the non-separable coupled state can be switched by rapidly opening or closing the support groove portion by a simple operation such as operation of the separation lock member.

In a sixth aspect based on any one of the first to fifth aspects, the separation lock members are provided on both left and right side portions of the main body cover, and the left and right separation lock members are integrally coupled to each other. It is a dust collection cover configured to be locked.

According to the sixth aspect, the pair of left and right separation lock members can more reliably maintain the separation lock state between the fixed cover and the main body cover. According to the sixth aspect of the invention, since the pair of left and right separation lock members are coupled to each other and the unlocking operation is performed integrally, the unlocking operation is performed as compared with the case of individually performing the unlocking operation. The operability at the time can be improved.

A seventh aspect of the present invention is the dust collecting method according to the sixth aspect, in which a pointer portion for indicating the position of the rotary blade is provided in a joint portion for mutually coupling the left and right separation lock members so that the position of the pointer can be adjusted in the thickness direction of the rotary blade. It is a cover.

According to the seventh invention, the connecting portion for connecting the pair of left and right separation lock members to each other is a portion for providing the pointer portion used when aligning the position of the rotary blade in the thickness direction with, for example, the sumi line. Used as. From this, according to the seventh aspect, in addition to the function of connecting the pair of left and right separation lock members to each other, the connecting portion can also have a function as a portion for providing the pointer portion.

An eighth invention is the dust-collecting cover according to any one of the first to seventh inventions, wherein the separation lock member is a spring-biased dust collecting cover.

According to the eighth aspect, it is possible to prevent an inadvertent pivoting operation of the separation lock member toward the unlock side due to vibration or the like, and thus prevent an inadvertent separation operation between the main body cover and the fixed cover. it can. Further, since the spring is biased to the lock side, if the operation to the unlock side is released, the separation lock member is automatically returned to the lock side, and it is possible to prevent forgetting the return operation to the lock side. In this respect, the careless separation of the main body cover and the fixed cover can be prevented more reliably.

A ninth invention is a cutting machine including the dust collecting cover according to any one of the first to eighth inventions.

According to the ninth invention, it is possible to obtain the above-described operation and effect with respect to the cutting machine equipped with the dust collecting cover according to any one of the first to eighth inventions, thereby improving workability of the cutting machine. Can be increased.

It is a front view of the dust collecting cover which concerns on this embodiment, and is a side view on the right side toward the direction in which cutting progresses. In the figure, the main body cover is shown in a state of being located at the lower end. It is a longitudinal cross-sectional view of a dust collecting cover. In the figure, the main body cover is shown in a state of being located at the lower end. It is a front view of a dust collection cover. In this figure, the main body cover is shown in the opened state 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 in the opened state and returned to the regulation angle. It is a (V) arrow line view of FIG. 1, Comprising: It is a top view of a dust cover and a cutting machine. It is a (VI) arrow view of FIG. 1, and is a bottom view of a dust collecting cover and a cutting machine. It is a (VII) arrow line view of FIG. 5, and is a rear view of a dust collecting cover and a cutting machine. It is a (VIII) arrow view of FIG. 7, Comprising: It is a front view of a dust collecting cover and a cutting machine. It is a (IX) arrow line 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 collecting cover from the back side. In this figure, the front part of the dust collecting cover is shown in a cross section taken 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 collecting cover from the back side. In this figure, the state where the main body cover is opened from the state shown in FIG. 11 is shown. It is the figure which looked at the dust collecting cover from the back side. In this figure, the state where the separation lock member is operated to the unlock 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 vertical sectional view. In this figure, the cutting machine is shown as removed. FIG. 6 is a vertical cross-sectional view of the dust collecting cover as viewed from the front side and is a cross-sectional view taken along the line (XV)-(XV) of FIG. 5. This figure shows a state where the main body cover is completely closed with respect to the fixed cover (lower end position). In this figure, the cutting machine is shown as removed. It is a longitudinal cross-sectional view of the dust cover as viewed from the front side. This figure shows a state in which the main body cover is opened upward from the state shown in FIG. In this figure, the cutting machine is shown as removed. It is a longitudinal cross-sectional view of the dust cover as viewed from the front side. This figure shows a state where the fixed stopper is unlocked. In this figure, the cutting machine is shown as removed. It is a longitudinal cross-sectional view of the dust cover as viewed from the front side. This figure shows a state in which the fixed stopper is locked. In this figure, the cutting machine is shown as removed. It is the figure which looked at the inside of the main body cover from the back side. In this figure, the illustration of the front side is omitted. FIG. 20 is a sectional view taken along the line (XX)-(XX) of FIG. 19. It is a perspective view of the dust collection cover provided with the separation lock member concerning a 2nd embodiment. In this figure, the cutting machine is removed. It is a front view of the dust collection cover provided with the separation lock member concerning a 2nd embodiment. It is a perspective view of a separation lock member concerning a 2nd embodiment. FIG. 22 is a sectional view taken along the line (XXIV)-(XXIV) of FIG. 21, and is a vertical sectional view of the dust collecting cover including the opening stopper according to the second embodiment. This figure shows a state in which the main body cover is opened up to the opening regulation angle θ ₀ . FIG. 22 is a sectional view taken along the line (XXIV)-(XXIV) of FIG. 21, and is a vertical sectional view of the dust collecting cover including the opening stopper according to the second embodiment. This figure shows a state in which the main body cover is opened beyond the opening regulation angle θ ₀ . FIG. 25 is a sectional view taken along the line (XXVI)-(XXVI) of FIG. 24, which is a vertical sectional view of the dust collecting cover including the dust collecting passage according to the second embodiment.

Next, an embodiment of the present invention will be described based on FIGS. As shown in FIGS. 1 to 7, the dust collecting cover 20 of the present embodiment is attached to a cutting machine 2 used for cutting work such as cutting or grooving a stone or concrete block, or cutting an asphalt road surface. It is mainly used to prevent dust generated by cutting work from scattering around. The cutting machine 2 may have the same configuration as the conventional one, and no particular change is required in this 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 structure equivalent to that of a disc grinder, and has a structure in which an electric motor 4 is housed in a cylindrical main body housing 3. A gear head 5 is connected to the front part of the main body housing 3. As shown in FIGS. 1 to 7, a handle portion 6 to be gripped by a user is coupled to a 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 by the fingertip of the hand holding the handle portion 6, the electric motor 4 is activated. A power cord 7 for supplying power is pulled out from the rear portion of the handle portion 6.

As shown in FIG. 10, a drive gear 4 a formed on the output shaft of the electric motor 4 is meshed with a bevel gear as a driven gear 8. The driven gear 8 is coupled to the spindle 9. The spindle 9 is supported rotatably around an axis line orthogonal 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 projects from the gear head housing 10 into the dust collecting cover 20. A circular rotary blade 15 is attached to this protruding portion. The rotary blade 15 is a blade called a diamond wheel, and rotates counterclockwise as indicated by a white arrow in FIG. The rotary blade 15 is sandwiched between the inner flange 13 and the outer flange 14 and 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 collecting cover 20 is coupled to the cutting machine 2 by tightening the clamp portion 17 on the outer periphery of the bearing holder 16. As will be described later, the cutting machine 2 is connected to the main body cover 23 of the dust collecting cover 20. The cutting machine 2 is coupled to the rear surface side (outer wall portion 23L) of the main body cover 23 in a sideways posture with the axis line (output axis line) of the spindle 9 along 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 gripping the handle portion 6 with one hand and the front grip 18 with the other hand, whereby the cutting work can be performed accurately. And it can be done quickly.

The dust collecting cover 20 has a main function of shielding the left and right side portions of the rotary blade 15 and the upper circumferential direction to prevent the dust generated at the cutting portion C from being scattered around. As shown in FIG. 3, a base 21 made of a steel plate 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 rotatably supported with respect to the fixed cover 22. Is equipped with. The body cover 23 is supported rotatably up and down with respect to the fixed cover 22 via a rotation support shaft 24. The rotating support shaft 24 is rotatably supported in the vicinity of the front end portion of the base 21 so as to extend in the left-right width direction. 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 rotary support shaft 24, respectively. The left and right front wheels 25 are grounded on 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 lateral width direction. Rear wheels 27 are attached to the left and right ends of the rear-side rear wheel shaft 26, respectively. The left and right rear wheels 27 are also in contact with the cut surface W. By the left and right front wheels 25 and the left and right rear wheels 27, the base 21 is grounded in a state of being slightly floating with respect to the cut surface W, which enables smooth movement along the cut surface W. As shown in FIGS. 2 and 6, a rectangular window portion 21a is provided at the center of the base 21. The lower portion 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 includes inner wall portions 22L and 22R that stand up from the left and right sides of the window portion 21a and cover 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. It has an inner peripheral edge portion 22E which is connected to each other and covers the periphery of the rotary blade 15 mainly on the rear side. The main body cover 23 to which the cutting machine 2 is attached is arranged between the left and right outer side wall portions 23L and 23R located outside the left and right inner side wall portions 22L and 22R of the fixed cover 22 and the end edges of the left and right outer side wall portions 23L and 23R. And an outer peripheral edge portion 23E that covers the upper half of the circumference of the rotary cutting tool 15 by being coupled to each other. As shown in FIGS. 10, 12, 13, 15, and 16, the inner wall portion 22L on the left side of the fixed cover 22 is provided with a relief portion 22c for allowing the spindle 9 of the cutting machine 2 to pass therethrough. The escape portion 22c 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 upper portion of the inner wall portion 22L.

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

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 the inner wall portion 22R on the right side of the fixed cover 22, and is inside the spring holder 33 attached to the side surface of the rotary blade 15 opposite to the cutting machine 2. 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 body cover 23. The spring holder 33 is attached to the rotation center (spindle 9) of the rotary blade 15 on the side opposite to the rotation support shaft 24. The spring holder 33 (spring holding portion 31) causes the compression spring 30 to form an arc centered on the rotation support shaft 24 in the region opposite to the rotation support shaft 24 with respect to the rotation center of the rotary blade 15. It is held so that it can expand and contract along.

The spring holder 33 is fixed to the right inner wall portion 22R of the fixed cover 22 with two fixing screws 33a. A retaining portion 33c for preventing the compression spring 30 from coming out is provided on the upper portion of the spring holder 33. The retaining portion 33c is provided with a pressing portion entrance passage 33b into 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 23R 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 vertically rotated with respect to the fixed cover 22, the pressing portion 32 is integrally displaced vertically in the spring holder 33. When the body cover 23 is rotated downward, the upper end of the compression spring 30 is pushed downward by the pressing portion 32, so that the body cover 23 is rotated upward (the fixed cover 22 is rotated downward). ) Urging force 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 expands and its urging force gradually decreases.

Here, for example, when the user grips the handle portion 6 and carries the cutting machine 2 together with the dust collecting cover 20, the fixed cover 22 is rotated downward with respect to the main body cover 23 by the urging force of the compression spring 30. , Is in a state of hanging from the main body cover 23 via 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 rotating operation of the fixed cover 22 and the body cover 23, which are rotatably coupled to each other, are switched. In the present specification, the reference of the rotating operation is appropriately changed and used. Further, in this specification, with respect to the directions of mutual rotation of the main body cover 23 and the fixed cover 22, the direction in which the rotary blade 15 is projected to the lower surface side of the base 21 is referred to as the closing direction, and the base 21 of the rotary blade 15 is referred to. The direction in which the amount of protrusion of the lower side of the lower side is reduced is called the opening direction. Therefore, the downward movement operation of the main body cover 23 (an operation of approaching the fixed cover 22) is also referred to as a closing operation, and the upward movement operation (an operation of separating from the fixed cover 22) is also referred to as an opening operation.

The main body cover 23 to which the cutting machine 2 is attached is urged by the urging force of the compression spring 30 in the direction of rotating upward (relatively opening direction) with respect to the fixed cover 22. As shown in FIG. 16, the pressing portion 32 is pressed against the upper end portion of the compression spring 30 to generate a biasing force. As shown in FIGS. 3 and 4, when the main body cover 23 is rotated upward with respect to the fixed cover 22 by a certain angle (opening regulation angle θ _{0 in} this embodiment), the lower side of the rotary blade 15 is the lower surface side of the base 21. It is in a state in which it is not projected to the inside and is accommodated in 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 to 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 withdrawn from the spring holding portion 31 via the pressing portion entrance passage 33b. When the pressing portion 32 is retracted from the inside of the spring holding portion 31, the compression spring 30 is further expanded and the upper end portion thereof is pressed by the retaining portion 33c, so that the compression spring 30 is held along the inside of the spring holding portion 31. .. Therefore, when the main body cover 23 is rotated downward thereafter, the pressing portion 32 enters the spring holding portion 31 through the pressing portion entrance passage 33b, and the upper end portion of the compression spring 30 is pressed again and the main body is pressed. A biasing 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 with respect to the fixed cover 22 by a predetermined angle (opening regulation angle θ _{0 in the} present embodiment), the main body cover 23 is further rotated upward. The dynamic motion 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 raised step portion 22a. The step portion 22a 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 step portion 22a. The opening stopper 40 is formed in a cut-and-raised claw shape when the fixed cover 22 is molded, and has an engaging claw portion 40a at its tip. The engaging claw portion 40a engages with an engaging portion provided on the inner surface of the right side wall portion 23R of the main body cover 23 to rotate the fixed cover 22 relative to the main body cover 23 in the relative opening direction. Regulated.

The opening stopper 40 is a range in which the fixed cover 22 is opened by the opening stopper 40 with respect to the main body cover 23 when the user grips the handle portion 6 and carries the cutting machine 2 together with the dust collecting cover 20, for example. It is possible to set the fixed cover 22 to the main body cover 23 via the rotation support shaft 24 while restricting the fixed cover 22 to a constant angle. However, even in this state, the fixed cover 22 and the main body cover 23 are open to each other up to the opening regulation 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 a fingertip, the engagement state of the engagement claw portion 40a with the engagement portion on the main body cover 23 side can be released. By releasing the engaged state of the engaging claw portion 40a, the fixed cover 22 can be further rotated with respect to the main body cover 23 in the opening direction beyond the opening regulation angle θ ₀ . By removing the engaging claw portion 40a of the opening stopper 40 and rotating the fixed cover 22 with respect to the main body cover 23 in the opening direction so as to be separable to an opening angle θ ₁ (about 45° in the present embodiment), the main body is closed. 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 exposed to a large extent, so that work such as replacement of the rotary blade 15 can be performed easily.

As shown in FIGS. 11 to 13, a support groove portion 23 a is provided at the front end portion of the main body cover 23. The support groove portions 23a are provided symmetrically on the left and right outer wall portions 23L and 23R of the body cover 23. The main body cover 23 is rotatably coupled to the fixed cover 22 by inserting the rotation support shaft 24 across the left and right support groove portions 23 a. The left and right support groove portions 23a are formed by cutting from the front end corner portion. Therefore, the rotation support shaft 24 can be relatively moved in the radial direction and pulled out from the left and right support groove portions 23a. The main body cover 23 and the fixed cover 22 can be separated from each other by relatively moving the rotation support shaft 24 in the radial direction from the inside of the left and right support groove portions 23a and pulling it out.

As shown in FIGS. 11 to 13, at the front end portion of the steel plate outer wall portion 23L of the main body cover 23, a separation lock member for restricting radial displacement (withdrawal) of the rotation support shaft 24 in the support groove portion 23a. 41 is provided. The separation lock member 41 is provided so as to be tiltable up and down about the support shaft 42. A hook-shaped engaging portion 41 a is provided on the lower portion of the separation lock member 41. As shown in FIGS. 11 and 12, when the engaging portion 41a is located below the rotation support shaft 24 and closes the support groove portion 23a, the rotation support shaft 24 extends in the radial direction inside the support groove portion 23a. 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 vertically rotatably coupled state with respect to the main body cover 23.

The separation lock member 41 is urged by a torsion spring 43 in a locking direction (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 engagement portion 44 provided in the outer wall portion 23L in a cut and raised shape. On the upper part of the separation lock member 41, an operation portion 41b is provided for allowing the user to press the fingertip to rotate the unlock lock direction. As shown in FIG. 13, when the fingertip is pressed against the operation portion 41b to tilt the separation lock member 41 against the torsion spring 43 toward the unlock side (counterclockwise direction in FIGS. 11 to 13), the engagement is performed. The portion 41a is disengaged from the position where the support groove portion 23a is closed.

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 a tilting range of the separation lock member 41 toward the unlock side. is doing. By this spring engagement portion 44, the tilt angle of the separation lock member 41 toward the unlock side is restricted to a constant angle. Therefore, as shown in FIG. 13, in order to completely retract the engaging portion 41 a of the separation lock member 41 from the support groove portion 23 a, first open the main body cover 23 relative to the fixed cover 22 by about 45°. It is necessary to rotate the main body cover 23 to the fixed cover 22 by an angle (separable opening angle θ ₁ ). The condition is that it is turned to an angle.

When the separation lock member 41 is tilted to the unlock side with the main body cover 23 rotated in the opening direction to the separable opening angle θ ₁ (about 45°) with respect to the fixed cover 22, the engaging portion 41 a Completely disengages from the position where the support groove 23a is closed. When the engaging portion 41a is completely disengaged from the support groove portion 23a, the radial relative displacement (withdrawal) of the rotation support shaft 24 in the support groove portion 23a is allowed. Therefore, the main body cover 23 or the fixed cover 22 is moved in the direction in which the rotary support shaft 24 is relatively pulled out from the inside of the support groove portion 23a in a state where the separation lock member 41 is tilted to the unlock side, so that the main body cover is moved. 23 and the fixed cover 22 can be relatively separated. When the fixed cover 22 is separated from the main body cover 23, the screw shaft portion 9a of the spindle 9, the outer flange 14, and the rotary cutting tool 15 are provided in the outer wall portion 23R on the right side of the main body cover 23 by cutting out a large semicircular work window. It is exposed through the portion 23S. The user can quickly and easily perform the replacement work of the rotary blade 15 through the work window portion 23S.

In this way, the fixed cover 22 can be separated from the main body cover 23 only by unlocking the separation lock member 41, and unless the separation lock member 41 is unlocked, the fixed cover 22 and the main body cover 23 are not unlocked. Is locked in the bound state. Therefore, 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 is inadvertently pushed and operated, and as a result, the fixed cover 22 is attached to the main body cover 23. It is possible to prevent the fixed cover 22 from falling off the main body cover 23 as it is even when the main cover 23 is rotated largely downward.

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

The stopper member 52 is supported movably with respect to the stopper frame 51 along the radial direction of the rotation support shaft 24. The stopper member 52 is urged by a compression spring 53 interposed between the stopper member 52 and the bottom portion of the stopper frame 51 in a direction in which its tip portion is protruded to the front side. An engagement recess 22b is provided in front of the depth adjustment stopper 50 and at the rear of the step 22a which is the front side wall of the groove 22d. As shown in the figure, a plurality of engaging concave portions 22b are provided along the rear portion of the step portion 22a. In the case of this embodiment, the plurality of engaging recesses 22b are provided at substantially equal intervals. The tip end of the stopper member 52 is projected by the compression spring 53 and fitted into any one of the engaging recesses 22b, so that the depth adjusting stopper 50 is vertically fixed so that it cannot be displaced. The user can withdraw the tip of the stopper member 52 from the inside of the engagement recess 22b by retracting the stopper member 52 against the compression spring 53 with a fingertip. By retracting the stopper member 52 with a 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 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 abutting portion 23b set on the lower side of the groove 23e on the rear side of the working window portion 23S abuts the stopper frame 51 of the depth adjustment stopper 50, The lower end positions of the body cover 23 and the cutting machine 2 are restricted. Since the depth adjusting stopper 50 regulates the lower end position of the cutting machine 2 and thus the rotary blade 15, the amount of protrusion of the rotary blade 15 from the lower surface of the base 21 is regulated, and therefore the cutting surface W of the rotary blade 15 is cut. The cutting depth can be adjusted in stages. 1, 3, and 14 to 18, the depth adjusting stopper 50 is fixed at the position where the tip end portion of the stopper member 52 is fitted into the lowermost engagement recess 22b. For this reason, the lower end position of the main body cover 23 is set to the lowest side, and thus the cutting depth of the rotary blade 15 with respect to the cutting surface W is set to the maximum. Although not shown in the drawing, a scale for indicating the corresponding cutting depth is displayed together with a numerical value in each engagement recess 22b.

As described above, the stopper frame 51 has a rectangular block body shape. Further, 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 abutting 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 tip end side of the stopper member 52 engaged with the engaging recess 22b as a fulcrum. Leans counterclockwise at. As a result of the stopper frame 51 tilting with the tip end side of the stopper member 52, which is different from the rotation support shaft 24, as a fulcrum, the rear upper corner portion 51b of the stopper frame 51 bites into the inner peripheral surface of the spring holder 33. The main body cover 23 is brought into contact with the main body cover 23, and 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 quickly performed with an accurate cutting depth.

The dust collecting cover 20 of the present embodiment includes, in addition to the depth adjusting stopper 50 described above, a fixing stopper 60 for fixing the fixing cover 22 and the main body cover 23 to each other at an arbitrary opening/closing angle so as not to rotate. There is. Further, in the dust collecting cover 20 of the present embodiment, in addition to the structure in which the fixed cover 22 and the main body cover 23 can be separated from each other as described above, the both covers 22 and 23 are fixed to each other at an arbitrary opening/closing angle. It has a new and useful feature in that it has a fixed stopper 60 for As shown in FIGS. 14 to 18, the fixed stopper 60 includes a base 64, an operating member 61, and a lock pin 62. The outer side wall 23R on the right side of the main body cover 23 is provided on the right side inner wall 22R of the fixed cover 22 and the step side cover 23c that covers the step 22a provided on the right side inner wall 22R of the fixed cover 22. A holder cover portion 23d that covers the spring holding portion 31 is provided in a state of bulging laterally. A groove 23e curved in an arc shape is provided between the step cover 23c and the holder cover 23d. The groove 23e enters the groove 22d of the fixed cover 22. The lower end of the groove portion 23e is a stopper contact portion 23b that contacts the depth adjustment stopper 50 described above.

The fixed stopper 60 is provided in the groove 23e. The base 64 is fitted and fixed in 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 vertically slidable within a certain range. A slide edge is provided on the front side of the operation member 61. The operation member 61 is slidably supported in the vertical direction with respect to the base 64 by allowing the slide edge portion to enter the slide groove portion. The operation member 61 is biased by a compression spring 63 in a direction of sliding upward. The compression spring 63 is interposed between the rear surface 61 a of the operation member 61 and the spring engagement portion 64 a provided on the lower portion of the upper surface of the base 64. The operation member 61 can be slid downward (to the lock position side) with a fingertip against the compression spring 63. When the operation member 61 is slid to the lock position side, the open/close operation of the fixed cover 22 and the main body cover 23 is locked, and the position of the rotary blade 15 is fixed.

An operating recess 61b is provided on the rear side surface of the operating member 61. The operating recess 61b is deep on the lower side and gradually shallower toward the upper side. A lock pin 62 is arranged so as to face the operation recess 61b. The lock pin 62 is held in a holding hole 23g provided in the holder cover portion 23d of the body cover 23. The holding hole 23g is provided so as to penetrate the front side wall portion of the holder cover portion 23d. The lock pin 62 has a diameter that is at least larger than the wall thickness of the front side wall portion of the holder cover portion 23d. Therefore, the lock pin 62 projects in the thickness direction from the front side wall of the holder cover 23d.

As shown in FIG. 18, when the operating member 61 is located at the upper unlocked position by the urging force of the compression spring 63, the deep lower portion of the actuating recess 61 b faces the lock pin 62. For this reason, the lock pin 62 is in a state of entering the deep portion below the actuating recess 61b and not protruding to the inside of the holder cover portion 23d. On the other hand, as shown in FIG. 18, when the operating member 61 is slid to the lower lock position against the biasing force of the compression spring 63, the upper shallow portion of the operating recess 61b faces the lock pin 62. It becomes a state. Therefore, the lock pin 62 is pushed by the shallow portion of the actuating recess 61b and is in a state of protruding inside 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 to a shallow portion of the operation recess 61b by a slide operation of the operation member 61 to the lock position side (downward). When the lock pin 62 is pushed inside the holder cover 23d, the lock pin 62 is pushed against the front surface of the spring holder 33 as shown in the drawing. In this way, the lock pin 62 is firmly sandwiched (cut into) between the operation 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 so that both covers 22 and 23 are locked at an arbitrary opening angle. Further, the operating member 61 is held at the lock position by the biting of the lock pin 62.

The fixed stopper 60, like the depth adjustment stopper 50, 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. The depth adjustment stopper 50 has a function of adjusting the cutting depth stepwise, but the fixed stopper 60 can fix the rotary blade 15 at an arbitrary cutting depth.

The cutting depth set by the depth adjusting 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 such that 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 effectively functions for the cutting form which is a form and does not accompany the downward movement of the body cover 23.

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

A dust collecting port 70 for connecting the dust collector CL is provided at the rear portion of the main body cover 23. The dust collector CL is connected to the dust collecting port 70 via a dust collecting hose H. The dust generated at the cutting portion C is blown upward in the dust collecting cover 20 by the swirling wind caused by the rotation of the rotary blade 15, and then is forcibly collected by the dust collector CL to be prevented from scattering to the surroundings.

As shown in FIGS. 2 and 4, a rear reinforcing plate 80 is provided at the rear of the fixed cover 22. The rear reinforcing plate 80 is provided by cutting and raising a part of the steel plate base 21, and stands upright from the rear part of the window 21a. The upper side of the rear reinforcing plate 80 is in contact with the inner surface of the inner peripheral edge portion 22E of the fixed cover 22. The rear reinforcing plate 80 is located along the peripheral edge on the rear side of the rotary blade 15. The rear reinforcing plate 80 reinforces the support rigidity of the fixed cover 22 mainly to the rear side base 21.

A dust guide plate 81 is provided along the front part and the upper part of the body cover 23. For the dust guide plate 81, a strip steel plate having a width that closes the space between the left and right side wall portions 23L and 23R is used. At the front of the dust guide plate 81, a front guide 81a is provided by cutting and raising a part thereof. The front guide portion 81a is formed by cutting and raising with a width larger than the wall thickness of the rotary blade 15. The front guide portion 81a is arranged in a state of standing upward in a curved shape from the vicinity of the front end portion of the window portion 21a of the base 21, and the upper end portion thereof is brought into contact with the inner surface of the outer peripheral edge portion 23E of the body cover 23. ing. By cutting and raising the front guide part 81a, a dust guide port 81b is provided behind it. The dust guide port 81b is formed right above the cutting site C and has a width larger than the wall thickness of the rotary blade 15. The upper side of the dust guide plate 81 is arranged substantially parallel to the outer peripheral edge portion 23E in the range from the vicinity of the upper end of the dust guide port 81b to the front of the dust collecting port 70. A dust collecting passage 82 is formed between the upper side of the dust guide plate 81 and the outer peripheral edge portion 23E.

The dust blown upward from the cutting portion C is guided to the dust collecting passage 82 by being blown to the front guide portion 81a through the dust guide port 81b. The dust blown into the dust collecting passage 82 is guided rearward toward the dust collecting port 70. The dust guided to the dust collecting port 70 through the dust collecting passage 82 is forcibly collected by the dust collector CL connected to the dust collecting port 70. Part of the dust that has leaked from the dust collecting passage 82 and has flowed to the rear portion of the fixed cover 22 is discharged to the outside of the dust collecting cover 20 (on the cut surface W) through the window 21a. Like the rear reinforcing plate 80 on the fixed cover 22 side, the dust guide plate 81 made of a steel plate functions as a reinforcing member for the main body cover 23 because it is sandwiched between the left and right outer wall portions 23L, 23R. Due to this, the durability of the dust cover 20 is enhanced.

The dust discharged through the window portion 21a of the base 21 or the dust accumulated on the cut surface W is collected in the dust collecting port 70 by the auxiliary dust collecting nozzle 85 described below. As shown in FIG. 20, the auxiliary dust collecting nozzle 85 is arranged along the rear portion of the main body cover 23. The auxiliary dust collecting nozzle 85 is provided with a mounting base portion 85a. The mounting base portion 85a is screwed to the vicinity of the dust collecting port 70 of the body cover 23. As shown in the drawing, the upper portion of the auxiliary dust collecting nozzle 85 is bent in an L shape toward the rear dust collecting port 70 above the mounting base 85a. Vent holes 85b are provided at the bent corners. The bent tip of the auxiliary dust collecting nozzle 85 is directed to the dust collecting port 70.

A portion of the auxiliary dust collection nozzle 85 below the mounting base portion 85a extends downward in a curved shape. A portion of the auxiliary dust collection nozzle 85 below the mounting base 85a is inserted into a cylindrical nozzle guide portion 86 provided in the rear portion of the fixed cover 22. The nozzle guide portion 86 is provided along the inner side of the inner peripheral edge portion 22E of the fixed cover 22. The nozzle guide portion 86 is provided along an arc having the same curvature as the auxiliary dust collection nozzle 85 on the main body cover 23 side. Therefore, when the main body cover 23 is rotated up and down with respect to the fixed cover 22, the curved portion of the auxiliary dust collection nozzle 85 below the mounting base 85a moves up and down in the nozzle guide portion 86. As shown in FIG. 20, when the main body cover 23 is moved down to the lowered end position, the lower end portion (auxiliary dust collecting port 85c) of the auxiliary dust collecting nozzle 85 is located directly above the auxiliary dust collecting hole 87 provided in the base 21. Reach

During the cutting process, the dust blown up from the cutting portion C is guided to the dust collecting port 70 through the dust collecting passage 82 and is forcibly collected by the suction force (dust collecting force) of the dust collector CL. Part of the dust that has leaked from the dust collecting passage 82 flows to the rear side and then is discharged onto the cut surface W through the window 21a. The discharged dust and the dust accumulated on the cut surface W are collected by the auxiliary dust collecting nozzle 85 through the auxiliary dust collecting hole 87. The suction force of the dust collector CL connected to the dust collection port 70 generates a suction force inside the auxiliary dust collection nozzle 85 due to the action of the ventilation hole 85b provided at the bent corner portion of the auxiliary dust collection nozzle 85. The dust on the cut surface W is sucked by the suction force of the auxiliary dust collecting nozzle 85. The dust sucked by the auxiliary dust collecting nozzle 85 is forcibly collected by the dust collector CL via the dust collecting port 70.

As shown in FIGS. 1, 3, and 15 to 18, a peep window portion 90 for visually observing the cut portion C is provided below the inner wall portion 22R on the right side of the fixed cover 22 and to the side of the cut portion C. It is provided. A lower portion of the inner wall portion 22R on the right side of the fixed cover 22 is provided with a peep window portion 90 by cutting away a portion where the user can easily see the cut portion C. The viewing window 90 is closed by a transparent cover 91 that allows the user to see through the cut portion C. A transparent resin plate is used for the transparent cover 91. The transparent cover 91 is supported rotatably up and down with respect to the inner wall portion 22R via a support shaft 92. On the upper part of the transparent cover 91, there is provided a grip portion 91a for the user to grip with the fingertip when the transparent cover 91 is rotated up and down.

A cover engaging portion 93 for holding the transparent cover 91 in the closed position is provided on the front portion of the viewing window portion 90. A dust removing portion 94 for wiping off dust adhering to the inner surface of the transparent cover 91 is provided on the upper portion of the viewing window portion 90. A felt material is used for the dust removing portion 94. The dust removing portion 94 is attached along the upper portion of the viewing window portion 90 over a long region in the front and rear direction. The user can accurately align the cutting edge of the rotary blade 15 with the cutting portion C (sumi line) of the cutting surface W by looking into the cutting portion C through the transparent cover 91, and thus perform accurate cutting work. Can be done quickly.

When the dust generated from the cut portion C adheres to the inner surface of the transparent cover 91 and the visibility is lowered, the user can also grasp (knob) the knob 91a and rotate (open) the transparent cover 91 upward. The cutting site C can be visually observed. When the transparent cover 91 is opened upward, the dust removing portion 94 is brought into sliding contact with the inner surface of the transparent cover 91, and the dust attached to the inner surface is wiped off. By moving the transparent cover 91 up and down a plurality of times, the dust adhering to the inner surface can be surely wiped off. In this way, the dust removing portion 94 functions as a wiper for wiping off the dust adhering to the inner surface of the transparent cover 91. When the opened transparent cover 91 is rotated downward to be closed, the front portion thereof is engaged with the cover engaging portion 93 and is held at the closed position. In the closed state of the transparent cover 91, the gap between the transparent cover 91 and the inner wall portion 22R is closed by the dust removing portion 94. This prevents the dust generated at the cutting site C from scattering.

In this way, only by the operation of opening the transparent cover 91 upward, dust attached to the inner surface of the transparent cover 91 is wiped off by the dust removing portion 94. Therefore, without performing a troublesome work such as removing the transparent cover 91, the visibility of the cut portion C can be recovered and the cutting work can be performed without stopping the rotary blade 15 and moving the transparent cover 91 up and down. It is possible to continue, and in this respect, the usability of the dust collecting cover 20 can be improved, and the workability of the cutting work can be improved.

According to the dust collecting cover 20 of the present embodiment configured as described above, the main body cover 23 and the fixed cover 22 can be separated from each other by unlocking the separation lock member 41. On the contrary, the main body cover 23 and the fixed cover 22 cannot be separated from each other unless the separation lock member 41 is unlocked. Therefore, when the dust collecting cover 20 is carried, for example, the body cover 23 and the fixed cover 22 are not accidentally separated. By unlocking the separation lock member 41 to separate the fixed cover 22 from the main body cover 23, the work of attaching and removing the rotary blade 15 can be performed quickly and easily.

Further, according to the illustrated dust collecting cover 20, the opening stopper 40 that restricts the rotational movement in the mutual opening direction is provided between the main body cover 23 and the fixed cover 22. According to the opening stopper 40, the main cover 23 and the fixed cover 22 are mutually opened at an opening angle (opening regulation angle θ ₀ ) smaller than the separable opening angle (separable opening angle θ ₁ ). Rotational movement is restricted in the opening direction. Therefore, in order to unlock the separation lock member 41 to separate the main body cover 23 and the fixed cover 22 from each other, it is necessary to first release the opening stopper 40. Inadvertent separation of 23 can be prevented more reliably.

Further, according to the illustrated dust collecting cover 20, a configuration is used in which the axle supporting the left and right front wheels 25 is used as the rotation support shaft 24 for rotatably supporting the body cover 23 and the fixed cover 22. Is becoming Moreover, the main body cover 23 is rotatably supported with respect to the fixed cover 22 by inserting the rotary support shaft 24 into the support groove 23a. As a result, the main body cover 23 and the fixed cover 22 are rotatable and separable from each other, and the usability thereof can be improved while simplifying the configuration near the front portion of the dust collecting cover 20.

Further, the separation lock member 41 is biased toward the lock side by a torsion spring 43. Therefore, the separation lock member 41 is automatically returned to the lock side by the spring biasing force when the operation to the unlock side is released. According to such an automatic return type separation lock member 41, it is possible to prevent a careless rotation operation of the separation lock member 41 toward the unlock side due to vibration or the like, and thus the main body cover 23 and the fixed cover 22 are careless. Can be prevented from being separated. Further, since the separation lock member 41 is spring-biased toward the lock side, if the operation to the unlock side is released, it will be automatically returned to the lock side, and the return operation to the lock side will not be forgotten. Also in this respect, it is possible to prevent the main body cover 23 and the fixed cover 22 from being separated carelessly.

Various modifications can be added to the embodiment described above. For example, the opening stopper 40 may be omitted. The separation lock member 41 alone can prevent an inadvertent separation operation between the main body cover 23 and the fixed cover 22.

By changing the tilting range of the separation lock member 41 toward the unlock side, the retracted amount of the engagement portion 41a with respect to the support groove portion 23a can be adjusted, and thus the separable opening angle θ ₁ (=about 45°) can be changed to a larger angle, for example.

Although the structure in which the separation lock member 41 is biased toward the lock side by the torsion spring 43 is illustrated, the separation lock member is locked by the engagement protrusion provided on the outer wall portion 23L of the main body cover 23 while omitting the torsion spring 43. It may be configured to be held at the position and the unlock position.

Further, although the configuration in which the axle supporting the front wheel 25 is used as the rotation support shaft 24 for supporting the fixed cover 22 and the main body cover 23 by rotation, different shafts are respectively arranged as the rotation support shaft and the axle. It may be configured.

Further, although the configuration in which one separation lock member 41 is provided on the left side portion of the main body cover 23 is illustrated, the configuration may be such that the separation lock members 45 are provided on both left and right side portions of the main body cover 23. 21 and 22 show the dust collecting cover 20 according to the second embodiment including two left and right separation lock members 45. Similar to the first embodiment, members and configurations that do not need to be changed are given the same reference numerals, and description thereof will be omitted. Similarly to the first embodiment, the left and right separation lock members 45 are supported in the vicinity of the front end of the main body cover 23 so as to be tiltable back and forth via a common support shaft 46. FIG. 23 shows the separation lock member 45 alone in the removed state. Both of the separation lock portions 45 have hook-shaped engaging portions 45a at their tips, as in the first embodiment.

The pair of left and right separation lock members 45 are integrated with each other via a coupling portion 48. The coupling portion 48 is arranged along the front surface of the main body cover 23 so as to straddle both separation lock members 45. For this reason, the left and right separation lock members 45 integrally tilt back and forth. An operation portion 48a that tilts forward is provided on the upper portion of the coupling portion 48.

Both separation lock members 45 are biased toward the lock side by a torsion spring (corresponding to the torsion spring 43 of the first embodiment and not visible in FIGS. 21 and 22) mounted around the support shaft 46. In a state where both the separation lock members 45 are held on the lock side by the torsion spring, the engaging portions 45a of the both separation lock members 45 are hooked on the left and right sides of the rotation support shaft 24, respectively, and inside the support groove portion 23a. The relative displacement in the radial direction is restricted, so that the main body cover 23 is locked inseparably with respect to the fixed cover 22. The rotation end position on the lock side is regulated by the spring engagement portion 44 provided corresponding to the left side separation lock member 45, as in the first embodiment.

On the contrary, the user can tilt the both separation lock members 45 integrally to the unlock side against the torsion spring through the operation portion 48a of the coupling portion 48. When both separation lock members 45 are tilted to the unlock side, both engagement portions 45a are retracted from below the rotation support shaft 24 to allow relative displacement of the rotation support shaft 24 in the support groove portion 23a in the radial direction. Therefore, the main body cover 23 can be separated from the fixed cover 22.

As shown in FIG. 21, on the front surface of the coupling portion 48, a scale 48b indicating a position (blade position) in the thickness direction (horizontal direction) of the rotary blade 15 is displayed. As shown in FIG. 22, a pointer portion (indicator) 49 can be attached to the connecting portion 48. The pointer portion 49 can be attached to the joint portion 48 so that the position thereof can be adjusted in the thickness direction (left and right direction) of the rotary blade 15. The position of the pointer portion 49 can be adjusted in response to a change in the plate thickness of the rotary blade 15 attached to the spindle 9 or a change in the attachment position. The position of the pointer 49 can be adjusted quickly and accurately based on the scale 48b. In this way, the pointer portion 49 is preliminarily aligned with the rotary blade 15, and then the dust collecting cover 20 and thus the cutting machine 2 are positioned so that the pointer portion 49 is aligned with the smear line drawn on the cutting surface W. The cutting tool 15 can be accurately aligned with the sumi line, and thus accurate cutting can be performed.

According to the pair of left and right separation lock members 45 according to the second embodiment configured as described above, the engaging portions 45a are hooked on the left and right end portions of the rotation support shaft 24, respectively. With respect to the portion, the relative displacement in the radial direction within the support groove portion 23a is more reliably regulated. Therefore, the joined state of the main body cover 23 to the fixed cover 22 is more firmly maintained, and the careless separation of the covers 22 and 23 is more reliably prevented.

The left and right separation lock members 45 can be integrally operated via the operation portion 48 a of the coupling portion 48. In addition, the coupling portion 48 is provided with a pointer portion 49 that indicates the position of the rotary blade 15. Accurate cutting work can be quickly performed by performing the scoring line alignment of the rotary blade 15 using the pointer portion 49.

24 and 25 show an opening stopper 75 according to the second embodiment, which is a modification of the above-described opening stopper 40. The above-described open stopper 40 is provided in a claw-like shape by cutting and raising it on the right side when the fixed cover 22 made of resin is molded, and the engaging claw portion 40a provided at the tip thereof engages with the engaging portion of the main body cover 23. By combining them, the fixed cover 22 is regulated with respect to the main body cover 23 so as not to rotate beyond the opening regulation angle θ ₀ . The opening stopper 40 according to the first embodiment is provided on the right side portion of the fixed cover 22, while the opening stopper 75 according to the second embodiment is provided on the rear portion of the main body cover 23.

The opening stopper 75 of the second embodiment includes a stopper lever 76 made of a strip steel plate. As shown in the figure, the stopper lever 76 is bent into a mountain shape at a gentle angle, and has a fulcrum portion 76a substantially at the center in the longitudinal direction. An operation portion 76b is provided on the upper side of the fulcrum portion 76a, and an engaging portion 76c bent in an L shape is provided on the lower side. The support pillar 77 is inserted under the fulcrum 76a. The support pillar portion 77 is fixed to the rear surface (outer peripheral edge portion 23E) of the main body cover 23 so as to project rearward. A flange 78 is fixed to the rear portion of the support pillar portion 77. A single compression spring 79 is provided around the support column 77 and between the flange 78 and the stopper lever 76. By the biasing force of the compression spring 79, the stopper lever 76 is biased in the direction (lock side) in which a flat portion below the fulcrum portion 76a is pressed against the rear surface of the main body cover 23.

The engaging portion 76c of the stopper lever 76 enters into a groove hole 23i provided in the rear surface of the main body cover 23. Further, the operation portion 76b is inserted into the inner peripheral side of the holding portion 23j provided on the rear surface of the main body cover 23. As a result, the stopper lever 76 is prevented from rotating around the support pillar portion 77, and is held in a direction that extends vertically along the rear surface of the main body cover 23.

As shown in FIG. 24, when the stopper lever 76 is located at the lock position where the space between the fulcrum portion 76a and the engaging portion 76c is pressed against the rear surface of the main body cover 23 by the urging force of the compression spring 79, the engaging portion 76c Is projected to the inner surface side of the main body cover 23 through the slot 23i. On the contrary, as shown in FIG. 25, by pushing and operating the operating portion 76b against the biasing force of the compression spring 79, the stopper lever 76 is rotated in the counterclockwise direction in the figure (unlock side by using the fulcrum portion 76a as a fulcrum). ) Can be tilted. When the stopper lever 76 is tilted to the unlock side, the engaging portion 76c is displaced in the direction of withdrawing from the slot 23i, and is in a state of being withdrawn from the inner surface side of the main body cover 23.

An engaging claw portion 80a is provided on the upper portion of the rear surface side (inner peripheral edge portion 22E) of the fixed cover 22. The engaging claw portion 80a is provided by bending the upper end portion of the metal rear reinforcing plate 80 in a direction in which the upper end portion extends slightly backward. As shown in FIG. 24, when the main body cover 23 is rotated in the opening direction with the stopper lever 76 positioned at the lock position by the urging force of the compression spring 79, the engaging portion 76c engages with the engaging claw portion 80a. Accordingly, further rotation of the body cover 23 in the opening direction is restricted. The opening angle of the main body cover 23, which is regulated by the engagement portion 76c of the stopper lever 76 engaging with the engagement claw portion 80a, is set to the opening regulation angle θ ₀ as in the first embodiment.

When the stopper lever 76 is unlocked by pushing the operation portion 76b against the compression spring 79 with the body cover 23 opened to the fixed cover 22 to the regulation angle θ ₀ , the engaging claw portion 80a is released. Since the engagement portion 76c is disengaged with respect to the main cover 23, the main body cover 23 can be opened at a larger angle with respect to the fixed cover 22 beyond the opening regulation angle θ ₀ . In this way, by unlocking the stopper lever 76, the main body cover 23 can be opened to the separable opening angle θ _{1 with} respect to the fixed cover 22.

According to the opening stopper 75 according to the second embodiment configured as described above, the rear portion of the main body cover 23 is located at the position farthest from the rotation support shaft 24 that rotationally supports the fixed cover 22 with respect to the main body cover 23. Since the engaging portion 76c is engaged with the engaging claw portion 80a to regulate the opening angle of the main body cover 23 between the rear cover and the fixed cover 22, the opening according to the first embodiment illustrated above. The opening angle can be regulated more reliably than the stopper 40.

In addition, in both cases, since the engaging portion 76c is engaged with the engaging claw portion 80a made of steel plate, the bending (elastic deformation) is smaller than that of the opening stopper 40 made of resin. The opening angle can be regulated more reliably. Further, the opening stopper 75 according to the second embodiment is provided at substantially the center of the dust collecting cover 20 in the left-right width direction. Also in this respect, the opening angle can be regulated more reliably than the opening stopper 40 of the first embodiment provided on the right side of the center in the left-right width direction.

Next, FIGS. 24 to 26 show a dust guide plate 83 of the second embodiment in which the dust guide plate 81 of the first embodiment is modified. The dust guide plate 81 of the first embodiment has an L-shaped cross section having a side wall along the left side of the bottom wall, but the dust guide plate 83 of the second embodiment is on the right side of the bottom wall 83b. It has an L-shaped cross section having a side wall portion 83a along it. A dust guide plate 83 having a right side wall portion 83a is provided along the inside of the outer peripheral edge portion 23E of the main body cover 23. Therefore, as shown in FIG. 26, the right side wall portion 83a of the dust guide plate 83 is located along the right outer wall portion 23R of the main body cover 23. A dust collecting passage 84 is formed by the dust guide plate 83. In the dust collecting passage 84 of the second embodiment, the lower and right sides are partitioned by the dust guide plate 83, the left side is partitioned by the outer wall portion 23L, and the upper part is partitioned by the outer peripheral edge portion 23E of the main body cover 23. .

Unlike the first embodiment, the right side of the dust collecting passage 84 is also partitioned by the right side wall portion 83a of the dust guide plate 83, so that the step cover portion provided on the right outer wall portion 23R of the main body cover 23 is provided. The dust collecting passage 84 is shielded from the concave and convex portion on the inner side by 23c, the holder cover portion 23d, the groove portion 23e and the like. Therefore, the dust blown up from the cut portion C and entering the dust collecting passage 84 is not blown against the uneven portion inside the main body cover 23 and the backward flow is not obstructed.

As shown in FIGS. 24 and 25, the dust guide plate 81 of the first embodiment and the rear side of the dust guide plate 83 of the second embodiment do not reach the dust collecting port 70. Therefore, between the rear side of the dust guide plate 83 and the dust collecting port 70, there is a gap 88 in which the dust collecting passage 84 is interrupted. Even when the main body cover 23 is moved downward with respect to the fixed cover 22 and the cutting depth of the rotary blade 15 is set to the maximum, the dust guide plate 81 on the rear side of the dust guide plate 81 is secured so as to ensure the appropriate opening gap 88. The position and the position of the upper portion of the inner peripheral edge portion 22E are set. Of the dust generated at the cutting portion C, the dust that does not enter the dust collecting passage 84 but flows backward by the rotating wind of the rotary blade 15 is collected in the dust collecting port 70 through the gap 88.

W... Cutting surface C... Cutting part CL... Dust collector, H... Dust collecting hose 2... Cutting machine 3... Main body housing 4... Electric motor 4a... Drive gear 5... Gear head 6... Handle part, 6a... Switch lever 7... Power cord 8... Driven gear 9... Spindle, 9a... Screw shaft portion 10... Gear head housing 11, 12... Bearing 13... Inner flange 14... Outer flange 15... Rotating blade tool 16... Bearing holder 17... Clamping portion 18... Front grip 20... Dust collection cover 21 ... base, 21a ... window theta ₀ ... opening regulating angle theta ₁ ... separable opening angle 22 ... fixed cover 22L ... inner wall portion (the left side), 22R ... inner wall portion (right side), 22E ... inner perimeter 22a ... step portion, 22b... engaging concave portion, 22c... escape portion, 22d... groove portion 23... body cover 23L... outer wall portion (left side), 23R... outer wall portion (right side), 23E... outer peripheral edge portion 23S... working window Part 23a... Support groove part, 23b... Stopper contact part, 23c... Step cover part 23d... Holder cover part, 23e... Groove part, 23f... Fixing screw, 23g... Holding hole 23h... Escape hole, 23i... Groove hole, 23j... Holding Part 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... Stop portion, 33d... Support groove portion 40... Opening stopper (first embodiment), 40a... Engaging claw portion 41... Separation lock member (first embodiment), 41a... Engaging portion, 41b... Operating portion 42... Spindle 43... Torsion spring 44... Spring engagement part 45... Separation lock member (second embodiment), 45a... Engagement part 46... Support shaft 48... Coupling part, 48a... Operation part, 48b... Scale 49... Pointer part 50... Depth adjusting stopper 51...Stopper frame 51a...Support edge portion, 51b...Rear upper corner portion 52...Stopper member 53...Compression spring 60...Fixed stopper 61...Operating member, 61a...Rear surface, 61b...Operating recess 62...Lock pin 63 ... compression spring 64... base, 64a... spring engaging portion 70... dust collecting port 75... opening stopper (second embodiment)
76... Stopper lever 76a... Support part, 76b... Operation part, 76c... Engaging part 77... Supporting column part 78... Flange 79... Compression spring 80... Rear reinforcing plate, 80a... Engaging claw part 81... Dust guide plate (No. 1 embodiment)
81a... Front guide part, 81b... Dust guide port 82... Dust collection passage 83... Dust guide plate (second embodiment)
83a... Side wall on the right side, 83b... Bottom wall 84... Dust collecting passage 85... Auxiliary dust collecting nozzle 85a... Mounting base, 85b... Ventilation hole, 85c... Auxiliary dust collecting port 86... Nozzle guide part 87... Auxiliary dust collecting Hole 88... Gap 90... Viewing window 91... Transparent cover, 91a... Picking portion 92... Spindle 93... Cover engaging portion 94... Dust removing portion

Claims (8)

A dust collecting cover that covers the periphery of the rotary blade of the cutting machine,
A fixed cover having a base that contacts the cutting surface; and a main body cover to which the cutting machine is attached,
The fixed cover and the main body cover are openably and closably coupled to each other via a rotation support shaft at a front portion in a cutting progressing direction,
At least one of the fixed cover or the main body cover is provided with a support groove portion through which the rotation support shaft is inserted,
The unlocking operation of separating the locking member provided on the body cover, the support and opening the ends of the groove portion separating said pivot shaft in mutually the body cover and the fixed cover is detached from the support in the groove Is possible,
A dust collecting cover configured to support the fixed cover and the main body cover inseparably from each other by closing the support groove portion with the separation lock member and restricting separation of the rotation support shaft . The dust collecting cover according to claim 1, further comprising: an opening stopper, which is provided between the main body cover and the fixed cover, for restricting a rotational movement in a mutual opening direction. The dust collecting cover according to claim 2, wherein the opening stopper is released, the fixed cover and the main body cover are rotated to a larger opening angle, and they are separated from each other by an unlocking operation of the separation lock member. Dust collection cover made possible. The dust collection cover according to any one of claims 1 to 3, wherein the separation lock member has an operation portion for performing the unlock operation . The dust collection cover according to any one of claims 1 to 4 , wherein the separation lock members are provided on both left and right sides of the main body cover, and the left and right separation lock members are coupled to each other. The dust cover is designed to be unlocked as a unit. The dust collecting cover according to claim 5 , wherein a pointer portion that indicates a position of the rotary blade is provided at a connecting portion that mutually connects the left and right separation lock members so as to be positionally adjustable in a thickness direction of the rotary blade. Dust cover. A dust collection cover as set forth in any one of claim 1 to 6, wherein the separating locking member, dust collection cover is spring-biased to the lock side. Cutting machine having a dust collection cover as set forth in any one of claims 1-7.

Images