JP2005254671A - Structure for fitting cover for cutting blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To utilize a cutting machine for preventing kickback of a cut material by providing a riving knife behind a cutting edge as it is without removing the riving knife even when channeling is performed. <P>SOLUTION: A cover C is fitted on a riving knife 10 through a supporting tool 20, and the supporting tool 20 is fixed by rotating a lever 23 after joints 31-34 of a connecting plate 30 are fitted into a connecting recesses 11-14 of the knife 10, and the cover C can be removed by releasing fixing by reversely turning the lever 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cover mounting structure that covers a rotating circular cutting blade in a cutting machine called a table saw, for example.

As shown in FIGS. 21 and 22, a cutting machine 100 called a table saw includes a table 102 on which a cutting material W is placed, and a circular cutting blade 103 that is rotatably supported by the table 102. I have. The upper part of the cutting blade 103 protrudes from the upper surface of the table 102. The protruding dimension of the cutting blade 103 can be changed by raising and lowering the cutting blade 103 with respect to the table 102. The cutting material W can be cut by pressing the cutting material W placed on the upper surface of the table 102 against the protruding portion of the cutting blade 103. In such a cutting machine 100, a cutting blade 103 having a thickness of about 2 mm is usually used.
Further, in this type of cutting machine 100, a flat plate-shaped riving knife 104 is disposed flush with the cutting blade 103 on the rear side of the cutting blade 103 (front side in the cutting progress direction, right side in FIGS. 21 and 22). Yes. A thin steel plate having a thickness of about 2 mm is used for the riving knife 104 as well as the cutting blade 103. Since the riving knife 104 is disposed flush with the cutting blade 103, it automatically enters a cutting port (cut generated by cutting) cut by the cutting blade 103 as the cutting material W moves. . When the riving knife 104 enters the cutting opening, the already cut portions of the cutting material W (portions located on both sides of the cutting blade C) are prevented from coming into contact with the side surfaces of the cutting blade 103. This prevents so-called kickback (the cutting material W is pushed back by the rotation of the cutting blade 103).

Next, in this type of cutting machine 100, the portion of the cutting blade 103 protruding from the upper surface of the table 102 is usually covered with the cover C. The cover C is made of, for example, a transparent resin plate, and functions as a safety cover that prevents foreign matter from contacting the cutting blade 103, and a dust cover that prevents scattering of chips generated by cutting. It also has the function as
The cover C is opened upward so as to be pushed up by the cutting material W during the cutting operation, and is kept on the upper surface of the cutting material W during the cutting operation. When the cutting material W is removed from the periphery of the cutting blade 103, the cover C comes into contact with the upper surface of the table and covers almost the entire range of the portion protruding from the upper surface of the table 102 of the cutting blade 103.
The cover C is pivotally attached to the support block body 106 with a pin 106 provided at the rear portion thereof as a pivot point for the purpose of mainly securing the attachment strength, and the riving knife 104 is interposed via the support block body 106. It is attached to the top. The support block body 106 is fixed to the upper part of the riving knife 104 by, for example, two fixing screws 107 and 107. Therefore, as shown in FIGS. 23 and 24, nuts 108 and 108 for screwing the fixing screws 107 and 107 are fixed to the upper portion of the riving knife 104 to which the fixing screws 107 and 107 are tightened by welding. Further, there is a structure in which a support block body and a riving knife are fixed with a rivet or the like instead of being fixed with screws and nuts in consideration of vibration during cutting work.
According to such an attachment structure of the cover C, there is no problem when performing a normal cutting operation, but it is necessary to remove the cover C and the support block body 106 because they become jammed when grooving. There is. Further, since the nuts 108 are fixed to the riving knife 104 so as to protrude from the side surfaces as described above, the riving knife 104 itself also becomes a grooving jam.
Therefore, when performing conventional grooving, not only the cover C and the support block body 106 but also the riving knife 104 itself is individually removed from the cutting machine, or the cover C, the support block body and the riving knife are integrated. Was removed from the cutting machine.
Japanese Utility Model Publication No. 6-46901 US Pat. No. 5,997,523

Thus, in the case of conventional grooving, it is necessary to remove the riving knife 104 from the cutting machine in addition to the cover C and the support block body 106. In this respect, the conventional cover mounting structure performs grooving. In some cases, it took time and effort to install and remove them.
The present invention has been made in view of this problem, and an object of the present invention is to provide a cover mounting structure that can be used as it is without removing a riving knife even when grooving is performed.

For this reason, this invention was set as the attachment structure of the structure described in each claim of a claim.
According to the mounting structure according to claim 1, each coupling portion of the coupling plate is engaged in a plane direction with the coupling recess of the riving knife so as not to protrude from the side surface of the riving knife. A plate and thus a support is attached to the riving knife. The cover is supported by the riving knife through the support tool thus attached. Therefore, it is not necessary to attach a conventional nut so as to protrude from the side surface of the riving knife, and therefore, a member protruding from the side surface of the riving knife can be eliminated.
Thus, in the state where each coupling portion is removed from the coupling recess and the support and thus the cover is removed from the riving knife, there is no portion protruding from the side like a conventional nut for the entire range of the riving knife. Grooving can be performed with the riving knife attached to the cutting machine as it is. Therefore, it is possible to greatly reduce the labor for performing grooving as compared with the conventional case.
Moreover, according to the attachment structure of Claim 1, even when the height of the riving knife is set to a position lower than the height of the cutting blade in advance, each coupling portion has a side surface in a state where the cover is attached. Since it is engaged with the riving knife in a state where it does not protrude, the cutting material can be cut without adjusting the position of the riving knife high.
According to the mounting structure of the second aspect, since the tightening force of the fixing screw is used, the support bracket and thus the support shaft can be firmly attached to the riving knife, thereby increasing the support rigidity of the cover. Can do.
According to the mounting structure of the third aspect, since the support bracket is brought into contact with the riving knife in a state of being positioned in the plate thickness direction, it is possible to prevent displacement in the plate thickness direction. In this respect, the cover can be attached more firmly.

According to the mounting structure of the fourth aspect, the support bracket is set with respect to the riving knife in a state where the fixed coupling portion is inserted into the corresponding coupling recess, and then the coupling plate is rotated to move the coupling. The part is entered into the corresponding coupling recess. Thus, the support bracket is coupled to the upper end surface and the rear end surface of the riving knife, and as a result, the cover is attached so as to be openable and closable. In this attached state, the fixed coupling part and the movable coupling part are fitted into a plurality of coupling recesses arranged alternately (in a staggered manner) on one side and the other side, respectively, so that the upper end of the riving knife Is sandwiched in the plate thickness direction by the plurality of movable coupling portions, and the rear end portion is sandwiched in the plate thickness direction by the plurality of fixed coupling portions, whereby the support bracket and thus the support tool are attached to the riving knife.
From this, it is not necessary to provide a member that protrudes from the side like a conventional nut to the riving knife, so when performing grooving processing, the riving knife can be used as it is attached to the cutting machine as it is, Thereby, grooving can be performed efficiently.
According to the mounting structure of the fifth aspect, the mounting state of the support bracket and thus the cover is maintained by the urging force of the coupling plate.
According to the attachment structure of the sixth aspect, in the stage before the movable coupling portion of the coupling plate is fitted into the coupling recess of the riving knife, the positioning of the coupling plate, and thus the support base in the thickness direction with respect to the riving knife can be easily performed. Thus, the movable coupling portion can be efficiently fitted into the coupling recess.

According to the mounting structure of claim 7, if the lever is moved to the mounting position of the cover while the upper part of the riving knife is inserted into the insertion recess, the upper part of the riving knife is sandwiched between the two outer plates. Thus, the support is fixed to the riving knife, whereby the cover is attached to the riving knife. In this attached state, if the lever is moved to the removal position, the two outer plates are returned to the direction of expanding the width of the insertion recess due to the elasticity in the thickness direction, so that the support and thus the cover can be removed from the riving knife. It becomes.
As described above, the cover can be easily detached from the riving knife only by operating the lever, and the riving knife does not require a member protruding from the side like a conventional nut. Even if it is a case, it can leave as it is, without removing like the past. Therefore, grooving can be performed quickly and efficiently without taking the trouble of removing and attaching the riving knife as in the prior art.
According to the attachment structure of the eighth aspect, the support can be attached more firmly to the riving knife.
According to the attachment structure of the ninth aspect, the external force applied to the two outer plates can be strengthened, whereby the riving knife can be sandwiched between the two outer plates more firmly. Also, the lever operating force can be greatly different between the mounting position of the cover that displaces the two outer plates via the pressing protrusion and the removal position that does not contact the two outer plates. The feeling of operation can be improved.

According to the mounting structure of the tenth aspect, when the upper part of the riving knife is inserted between the mounting base and the sandwiching base and the lever is rotated to the cover mounting position in this entering state, the nut is fastened to the screw shaft. Rarely, the sandwiching base is displaced in a direction approaching the mounting base, whereby the upper part of the riving knife is sandwiched between the mounting base and the sandwiching base, and the support is attached to the upper part of the riving knife. A cover is attached to the riving knife.
Conversely, when the lever is rotated in the cover removal direction, the nut is loosened with respect to the screw shaft, so that the sandwiching base can be displaced away from the mounting base. The upper part of the riving knife can be withdrawn from the cover, so that the support can be removed from the riving knife and the cover can be removed from the riving knife.
Thus, even with the mounting structure according to the tenth aspect, it is possible to easily attach and detach the support tool and the cover to the riving knife by operating the lever. Therefore, it is not necessary to provide a member that protrudes from the side surface of the riving knife as in a conventional nut. Therefore, even when grooving, only the cover can be removed from the riving knife and the riving knife can be left as it is. Grooving can be performed quickly and efficiently.
According to the attachment structure of the eleventh aspect, since the sandwiching base can be opened and closed with respect to the mounting base by tilting the sandwiching base with the support protrusion as a fulcrum, the upper portion of the riving knife is between the bases. The operability at the time of entering can be improved. Further, since the engaging protrusion fits into the engaging recess of the riving knife, the support tool and thus the cover can be attached to the riving knife more firmly.
According to the mounting structure of the twelfth aspect, instead of fixing the cover mounting support to the riving knife using bolts and nuts as in the prior art, the riving knife is simply sandwiched between the two members. Since it is a structure to fix, it is not necessary to attach the member which protrudes from the side of a riving knife like the conventional nut to the said riving knife. Therefore, if the cover is removed from the riving knife at the time of grooving, the riving knife can be used as it is attached. Therefore, since it is not necessary to remove the riving knife as in the conventional case, grooving can be performed more quickly and efficiently than in the past.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an attachment structure according to the first embodiment of the present invention. The first embodiment corresponds to an embodiment of the invention described in claims 1 to 3 or claim 12 of the claims.
The present embodiment is characterized by an attachment structure for allowing the cover C to be easily attached to and detached from the riving knife. For example, the configuration of the cutting machine and the like is sufficient as in the prior art. No change is required. Therefore, the same components and members as those of the conventional art are denoted by the same reference numerals, and the description thereof is omitted.
In FIG. 1, the code | symbol 10 has shown the riving knife in the attachment structure of 1st Embodiment. The riving knife 10 is disposed flush with the cutting blade 103 on the front side in the cutting progress direction. The cutting blade 103 is arranged in a state of protruding partly on the upper surface side of the table 102. The cutting blade 103 and the riving knife 10 can be lifted and lowered in parallel with respect to the table 2, whereby the cutting depth of the cutting blade 103 with respect to the cutting material W can be adjusted. In the present embodiment, the riving knife 10 having a thickness t = 2.0 mm is used.
Like the cutting blade 103, the riving knife 10 is fixed in a state in which it partially protrudes from the upper surface side of the table 102. The riving knife 10 is allowed to enter the cutting port immediately after cutting, so that the width of the cutting port is maintained at a certain level or more, thereby preventing the cutting material from coming into contact with the side surface of the cutting blade 103 and so-called kickback. Can be avoided.
Now, in this embodiment, the cover C is attached to the riving knife 10 via the support tool 20. The support 20 includes a support bracket 21 that is in contact with the upper end surface 10U having a width of 2 mm of the riving knife 10. A support shaft 25 that supports the cover C so as to be pivotable up and down is supported at the rear portion of the support bracket 21 (the rear side of cutting progress, the right side in FIGS. The cover C covers almost the entire portion of the cutting blade 103 protruding from the table 2 from both sides, and does not require any particular change in this embodiment.
In the center of the lower surface of the support bracket 21, an accommodation recess 21 a for accommodating a coupling plate 30 described below is formed. An insertion hole 21 b for inserting the screw 22 is formed at the bottom of the housing recess 21 a and at the center of the upper surface of the support bracket 21. The screw 22 protrudes from the upper surface side of the support bracket 21. A wing nut 23 is attached to the protruding portion. The screw 22 is fixed to the upper surface of the holding block 24 located in the accommodation recess 21a. As shown in FIG. 3, the holding block 24 is accommodated in the accommodation recess 21 a so as to be movable up and down without being rattled in the width direction (left and right direction in FIG. 3) and stopped. For this reason, when the wing nut 23 is tightened with respect to the screw 22, the holding block 24 moves to the upper side (the bottom side of the accommodating recess 21a).

A coupling plate 30 is supported on the holding block 24 via a coupling pin 26. In this embodiment, the coupling plate 30 is manufactured using a metal plate having a thickness (t = 1.5 mm) slightly thinner than the riving knife 10 as a material. The coupling plate 30 includes four coupling portions 31 to 34 provided so as to protrude downward as illustrated. Each coupling part 31-34 is provided with the rectangular arm parts 31a-34a and the circular engaging parts 31b-34b. The side surfaces (circumferential surfaces) of the engaging portions 31b to 34b are inclined. Therefore, each engaging part 31b-34b has a substantially truncated cone shape.
As shown in FIG. 4, the inclination directions of the side surfaces of the engaging portions 31 b to 34 b are alternately formed in opposite directions. Therefore, in FIG. 2, the leftmost engaging portion 31b and the third engaging portion 33b from the left can be seen from the bottom of the truncated cone shape, and the second engaging portion 32b from the left and the rightmost engaging portion 33b can be seen. The joint portions 34b can be seen from the upper side of the truncated cone shape. From this, each engaging part 31b-34b is arrange | positioned in the direction where the upper surface and bottom face of a truncated cone shape become the opposite side alternately. The thickness of each coupling part 31-34 is also t = 1.5 mm.
The upper center of the coupling plate 30 is connected to the holding block 24 via the coupling pin 26. For this reason, the coupling plate 30 can be slightly tilted back and forth (front and rear in the cutting progress direction) around the coupling pin 26 within a range allowed in the housing recess 21a.
Further, guide protrusions 27, 27 that are pointed in a V shape are provided at two positions on the lower surface of the support bracket 21. The guide protrusions 27 will be described later.

Next, on the upper part of the riving knife 10, coupling concave portions 11 to 14 are provided corresponding to the coupling portions 31 to 34 of the coupling plate 30. Each of the coupling recesses 11 to 14 has a shape in which groove portions 11a to 14a having a constant width and circular engagement hole portions 11b to 14b are connected. As shown in FIG. 4, the engagement hole portions 11 b to 14 b are inclined at the inner peripheral surfaces corresponding to the engagement portions 31 b to 34 b of the coupling plate 30, and the inclination directions are alternately opposite to each other. It has become. Therefore, when the front side surface (lower surface side in FIG. 4) of the riving knife 10 in FIG. 2 is the front surface and the opposite side surface (upper surface side in FIG. 4) is the back surface, the leftmost engagement hole portion 11b The third engagement hole 13b from the left is open on the front side, and the second engagement hole 12b and the rightmost engagement hole 14b from the left are open on the back side. In addition, regarding the inclination direction of the inner peripheral surfaces of the engaging hole portions 11b to 14b, the side on which the opening area is increased is defined as the opening side.
The groove portions 11a to 14a and the engagement hole portions 11b to 14b in the respective coupling recesses 11 to 14 respectively connect the respective arm portions 31a to 34a and the engagement portions 31b to 34b of the coupling plate 30 from either the front surface side or the back surface side. It is formed with dimensions that can be inserted. That is, the minimum diameter of each engagement hole part 11b-14b is set to a larger diameter than the maximum diameter of each engagement part 31b-34b. As shown in FIGS. 1 and 4, the coupling portion 31 of the coupling plate 30 is inserted into the coupling recess 11, the coupling portion 32 is inserted into the coupling recess 12, the coupling portion 33 is inserted into the coupling recess 13, and the coupling portion 34 is It is inserted into the coupling recess 14. In the respective inserted states, the coupling portions 31 to 34 have a plate thickness t = 1.5 mm, and the depth of the coupling recesses 11 to 14 (= the plate thickness of the riving knife 10) is t = 2.0 mm. For this reason, each of the coupling portions 31 to 34 does not protrude from the side surface of the riving knife 10.
Guide recesses 15 and 15 having a V-shaped cross section are formed at two locations on the front and rear of the upper end surface 10U having a width of 2 mm of the riving knife 10 corresponding to the guide projections 27 and 27 on the support 20 side. As described above, the coupling portions 31 to 34 are inserted into the corresponding coupling recesses 11 to 14, and the guide protrusions 27 and 27 are inserted into the guide recesses 15 and 15. This insertion state is shown in FIG. 1 and FIG. By inserting the guide protrusions 27 having a V-shaped cross section into the guide recesses 15 having a V-shaped cross section, the support 20 is positioned with respect to the riving knife 10 in the plate thickness direction.

According to the mounting structure of the first embodiment configured as described above, as shown in FIG. 1, both guide projections 27, 27 are fitted into the guide recesses 15, 15, respectively, and the respective coupling portions 31-31 of the coupling plate 30 are fitted. When the wing nut 23 is tightened in a state where the 34 is inserted into the corresponding coupling recesses 11 to 14, the support bracket 21 is pressed against the upper end surface 10 U of the riving knife 10 by the tightening force, while the coupling plate 30. The coupling portions 31 to 34 are pressed in the surface direction against the inner peripheral upper surfaces of the coupling recesses 11 to 14, whereby the support bracket 21 is firmly fixed to the upper portion of the riving knife 10, and thus the cover C is riving. It is attached to the knife 10 so that it can be opened and closed up and down. The conical shapes of the four fixed coupling portions are alternately arranged, so that when a load is applied in the surface direction of the riving knife, the direction is perpendicular to the riving knife surface and alternates. As a force is applied in the opposite direction, as a result, the coupling plate becomes parallel to the riving knife and is adjusted to a position near the center.
When grooving is performed, only the cover C can be removed with the riving knife 10 left intact. To remove the cover C, the wing nut 23 is loosened. When the wing nut 23 is loosened, the pressing force of the support bracket 21 against the upper end surface 10U of the riving knife 10 is released, and the coupling portions 31 to 34 of the engaging holes 11b to 14b of the riving knife 10 are released. The pressing force in the surface direction is released. For this reason, while being able to remove the support bracket 21 from the upper end surface 10U of the riving knife 10, each coupling part 31-34 can be extracted from the coupling recessed parts 11-14, and, thereby, the said support tool 20 and by extension, the cover C can be removed. It can be easily removed from the riving knife 10. In addition, since there is no member protruding from the side of the riving knife, the height of the riving knife can be set to a position lower than the height of the cutting blade in advance, and after removing the cover C, the height of the riving knife is adjusted to be low. This saves you time and effort.
Since the riving knife 10 with the cover C and the support 20 removed has no members or parts protruding from the side surfaces such as the conventional nuts 108 and 108, the riving knife 10 can exhibit its function even in grooving.
That is, the wing nut 23 is rotated in the tightening direction (lever operation), and a part of the riving knife 10 is sandwiched between the coupling portions 31 to 34 and the guide protrusions 27 and 27 (two members) in the surface direction. Accordingly, since the support 20 is fixed to the riving knife 10 and the cover is attached, a member that protrudes from the side surface of the riving knife 10 such as a conventional nut is not required. While removing the cover C, the riving knife 10 can be grooved while remaining as it is.

As described above, according to the cover mounting structure of the first embodiment, the cover C can be easily detached from the riving knife 10, so that it is not necessary to remove the riving knife 10 in the grooving process as in the prior art. Grooving can be performed quickly and efficiently without the need for attaching and removing the riving knife as in the prior art.
Moreover, according to the cover attachment structure of 1st Embodiment, it is the state which attached the cover C and the support tool 20, Comprising: The coupling | bond part 31-31 of the coupling | bonding board 30 in each engagement hole part 11a-14a of the riving knife 10 is attached. Even when 34 is inserted, the coupling portions 31 to 34 (plate thickness t = 1.5 mm) do not protrude from the side surface of the riving knife 10 (plate thickness t = 2.0 mm). For this reason, even in the state in which the cover C is attached, the entire range of the riving knife 10 (the range reaching the upper end) can be made to enter the cutting port and function effectively.
Further, since the connecting plate 30 can be engaged with and disengaged from the riving knife 10 by rotating and tightening the wing nut 23 to loosen the screw 22, the cover can be used without using a conventional screw tightening tool. C can be attached and detached.
Various modifications can be made to the first embodiment described above. For example, although the configuration in which the guide protrusions 27 and 27 are sharpened to have a V-shaped cross section is illustrated, the guide protrusion may be provided on a protrusion having a semicircular cross section at the tip. In this case, the guide recess on the riving knife 10 side may be formed in a groove having a semicircular cross section instead of a V-shaped cross section. The number of connecting portions may be an even number of four or more in order to keep the riving knife and the connecting plate parallel to each other. What is necessary is just to set suitably in relation to a space.
Moreover, although the outer peripheral surface of each coupling | bond part 31-34 of the coupling plate 30 was inclined in the taper shape and the structure which inclined the inner peripheral surface of each coupling | bonding recessed part 11b-14b corresponding to this was illustrated, it is cone shape May be formed in a polygonal pyramid shape, and the outer peripheral surface of the coupling portion and the inner peripheral surface of the coupling recess may be formed on a circumferential surface parallel to the axis.
Furthermore, although the configuration in which the coupling plate 30 is supported so as to be tiltable up and down with respect to the holding block 24 via the coupling pin 26 is illustrated, it may be configured to be directly fixed and integrated with each other.

Next, a second embodiment of the present invention will be described. The mounting structure of the second embodiment corresponds to an embodiment of the invention described in claims 4 to 6 or claim 12 of the claims.
FIG. 6 shows the mounting structure of the second embodiment. The description of the same configuration and members as those in the first embodiment is omitted. The cover C can be easily attached to and detached from the riving knife 40 also by the attachment structure of the second embodiment. The cover C is attached to the upper part of the riving knife 40 via the support tool 50. Further, the cover C is supported by a support shaft 55 provided on the support 50 so as to be opened and closed up and down.
The support 50 includes a support bracket 51 having an upper end surface facing portion 51a facing the upper end surface 40U of the riving knife 40 and a rear end surface facing portion 51b facing the rear end surface 40K. A coupling plate 52 is supported on the upper end surface facing portion 51 a via a support shaft 53 so as to be tiltable up and down. The coupling plate 52 is urged counterclockwise in FIG. 6 by a torsion spring 54. The coupling plate 52 includes an upper lever portion 52a, two movable coupling portions 52b and 52c projecting toward the upper end surface 40U of the riving knife 40, and a rear guide portion 52d.
As shown in FIG. 8, in this embodiment, the coupling plate 52 is formed by superposing and joining two thin steel plates having a thickness of t = 0.8 mm, and is formed in a semicircular shape that projects from one of the two thin steel plates. The edge part of the semicircular shape formed as one movable coupling part 52b and the other thin steel sheet is formed as the other movable coupling part 52c. Accordingly, the two movable coupling portions 52b and 52c each have a plate thickness t = 0.8 mm. However, as shown in FIG. 9, the two movable coupling portions 52b and 52c cross each other in the thickness direction and are shifted by one thickness.
As shown in FIG. 7, the guide portion 52 d is formed in a Y-shaped cross section so as to sandwich the left and right side surfaces of the riving knife 40 when the coupling plate 52 is tilted against the torsion spring 54. By superimposing the guide portion 52d on the side surface of the riving knife 40, the connecting plate 52 and, consequently, the support member 50 is positioned in the thickness direction with respect to the riving knife 40.

Next, fixed coupling portions 51c, 51d, 51e, 51f are formed on the rear end surface facing portion 51b of the support bracket 51 so as to project toward the rear end surface 40K of the riving knife 40 at four locations in the vertical direction. The rear end face facing portion 51b of the support bracket 51 is also formed by superimposing thin steel plates having a thickness of t = 0.8 mm, and the first and third fixed coupling portions 51c and 51e from the top on one thin steel plate. Is formed in a semicircular shape, and the second and fourth fixed coupling portions 51d and 51f from the top are formed in a semicircular shape on the other thin steel plate. These four fixed connections are also formed in a semicircular shape. Although not shown in the drawings, the first and third fixed coupling portions 51c and 51e from the top, and the second and fourth fixed coupling portions 51d and 51f from the top have the same plate thickness as the movable coupling portions 52b and 52c. The sheet crosses each other and is shifted by one sheet thickness.
On the upper end surface 40U of the riving knife 40, coupling concave portions 41 and 42 having a semicircular shape are formed at two locations corresponding to the movable coupling portions 52b and 52c. In addition, semicircular coupling recesses 43 to 46 are formed on the rear end surface 40K of the riving knife 40 at four locations corresponding to the fixed coupling portions 51c to 51f. Of the two side surfaces of the riving knife 40, when the front side surface in FIG. 6 is the front surface and the opposite side surface is the back surface, the two coupling recesses 41 and 42 on the upper end surface 40U side and the rear end surface 40K side The four coupling recesses 43 to 46 are alternately arranged on the front and back surfaces of the riving knife 40 in opposite directions. That is, of the coupling recesses 41 and 42 on the upper end face 40U side, the coupling recess 41 on the front side (left side in FIG. 6) is formed on the front side, and the coupling recess 42 on the rear side (right side in FIG. 6) is on the back side. Is formed. Of the coupling recesses 43 to 46 on the rear end face 40K side, the first and third coupling recesses 43 and 45 from the top are formed on the surface side, and the second and fourth coupling recesses 44 and 46 from the top are It is formed on the back side. Each of the coupling recesses 41 to 46 is formed with a depth of 0.8 mm. For this reason, the movable coupling parts 52b and 52c and the fixed coupling parts 51c to 51f are inserted into the coupling recesses 41 to 46 in a state where they do not protrude from both side surfaces of the riving knife 40. The two movable coupling portions 52b and 52c are alternately inserted into the coupling recesses 41 and 42 from the front and back surfaces, whereby the upper end portion 40U of the riving knife 40 is sandwiched between the movable coupling portions 52b and 52c in the plate thickness direction. Retained. Further, the four fixed coupling portions 51c to 51f are alternately inserted into the coupling concave portions 43 to 46 from both the front and back surfaces, so that the rear end portion 40K of the riving knife 40 is moved in the plate thickness direction by the fixed coupling portions 51c to 51f. It is sandwiched and held.
In the two coupling recesses 41 and 42 on the upper end 40U side, the front portions 41a and 42a are escaped in the tangential direction. As will be described later, this escape allows the coupling portions 52b and 52c to move in a circular arc.

According to the mounting structure of the second embodiment configured as described above, as shown in FIG. 6, the movable coupling portions 52b and 52c are alternately arranged on the front and back with respect to the coupling recesses 41 and 42 of the upper end portion 40U of the riving knife 40. The fixed coupling portions 51c to 51f are alternately inserted into the coupling recesses 43 to 46 of the rear end portion 40K, and the support bracket 51 is inserted into the upper end surface 40U and the rear end surface 40K of the riving knife 40. The cover C is attached to the riving knife 40. In this attached state, the movable coupling portions 52b and 52c are inserted into the coupling recesses 41 and 42, whereby the front-rear direction of the support 50 is fixed, and the fixed coupling portions 51c to 51f are inserted into the coupling recesses 43 to 46. Thus, the vertical direction of the support tool 50 is fixed, and the movable coupling parts 52b and 52c and the fixed coupling parts 51c to 51f are alternately inserted into the coupling recesses 41 to 46, so that the support tool 50 is riving. The cover 40 is fixed to the riving knife 40 so that it can be opened and closed.
In order to remove the cover C from the riving knife 40, the lever 52a is moved upward as shown by the white arrow in FIG. 6, and the coupling plate 52 is tilted in the counterclockwise direction around the support shaft 53. Let This tilting operation is performed against the torsion spring 54. Thereby, the movable coupling parts 52b and 52c can be extracted from the coupling recesses 41 and 42. When the movable coupling parts 52b and 52c are extracted from the coupling recesses 41 and 42, the support 50 can be moved in the surface direction of the riving knife 40 (cutting progress direction, rightward in FIG. 7).
When the support 50 is moved to the right in FIG. 7, the fixed coupling portions 51 c to 51 f are extracted from the coupling recesses 43 to 46, and the support 50 and thus the cover C can be removed from the riving knife 40.
When the cover C and the support tool 50 are removed from the riving knife 40 in this way, there is no member or part protruding from the side surface of the riving knife 40. Therefore, the riving knife 40 can be used as it is in grooving. .

Next, when attaching the cover C to the riving knife 40, the lever 52a is displaced upward against the torsion spring 54 as shown in FIG. While maintaining the tilted state in the clockwise direction, the upper end surface facing portion 51a of the support bracket 51 is placed along the upper end surface 40U of the riving knife 40, and the rear end surface facing portion 51b is placed on the rear end surface 40K of the riving knife 40. Set in line. Next, while holding the tilting position of the coupling plate 52, the support 50 is moved to the left side of the drawing as shown by the white arrow in the figure, and the fixed coupling portions 51c to 51f are coupled to the riving knife 40. Insert into the recesses 43-46. At this time, by moving the support 50 to the left in the figure while sliding the guide portion 52d of the coupling plate 52 to the surface side of the riving knife 40 and positioning it in the plate thickness direction, each fixed coupling portion 51c˜ 51f can be smoothly inserted into the coupling recesses 43 to 46.
The support members 50 are fixed to the riving knife 40 in the vertical direction and the plate thickness direction by alternately inserting the fixed coupling portions 51c to 51f into the coupling recesses 43 to 46, respectively.
The support member 50 is moved to the left in FIG. 7, and the fixed coupling portions 51c to 51f are inserted into the coupling recesses 43 to 46, and then the lever portion 52a is moved downward to move the coupling plate 52 in the counterclockwise direction shown in the figure. By tilting, the movable coupling parts 52b and 52c are inserted into the coupling recesses 41 and 42, respectively. At this time, since the front portions 41a and 42a of both the coupling recesses 41 and 42 are released in the tangential direction, both the movable coupling portions 52b and 52c smoothly move in an arc around the support shaft 53, and the coupling recesses 41, 42 is inserted. By inserting both movable coupling parts 52b and 52c alternately into the coupling recesses 41 and 42, the support 50 is fixed to the riving knife 40 in the front-rear direction and the plate thickness direction. By the above operation, the cover C can be attached to the riving knife 40 so that it can be opened and closed up and down.

As described above, the cover C can be easily attached to and removed from the riving knife 40 also by the attachment structure of the second embodiment, so that the riving knife 40 is attached as it is even when grooving is performed. It can be left in the state. For this reason, it is not necessary to attach and remove the riving knife together with the conventional technique, and in this respect, the grooving can be performed more quickly and efficiently than in the prior art.
That is, by operating the lever portion 52a, a part of the riving knife 40 is sandwiched in the surface direction by the movable coupling plates 52b and 52c and the fixed coupling plates 51c to 51f (two members), thereby the support tool 50 is lifted. Since the cover C is fixedly attached to the bing knife 40, a member that protrudes from the side surface of the riving knife 40 such as a conventional nut is not required. Grooving can be performed with the bing knife 40 left as it is.
Further, according to the mounting structure of the second embodiment, the movable coupling portions 52b and 52c and the stationary coupling portions 51c to 51f are inserted without protruding from the side surface of the riving knife 40 in the mounting state of the cover C. The entire range of the riving knife 40 can be made to enter the cutting opening so that the kickback prevention function can be effectively functioned.
Furthermore, since the lever 52a is tilted and the riving knife 40 is sandwiched and fixed between the movable coupling plates 52b and 52c and the fixed coupling plates 51c to 51f, the conventional screw tightening tool is used. The cover C can be attached and detached without using.
The mounting structure of the second embodiment described above can be implemented with further changes. That is, in the mounting structure exemplified above, the fixed coupling portions 51c to 51f are inserted into the coupling recesses 43 to 46 provided in the rear end portion 40K of the riving knife 40, so that the support tool 50 and thus the cover C are laid. Although the structure fixed to the bing knife 40 to the up-down direction was illustrated, for example, as shown in FIG. 11, the fixed coupling portions 51c to 51f and the coupling concave portions 43 to 46 are eliminated, and the rear end surface facing portion 51b of the support bracket 51 is removed. It is good also as a structure which fixes to the attachment stand 56 of the cutting blade 103 and the riving knife 40 installed in the lower part of the table 102 by fixing means, such as a volt | bolt and a nut 57, extending below.
Further, the coupling plate 52 can be eliminated, and for example, four movable coupling portions 52b, 52c, 52e, and 52f can be directly provided on the upper end surface facing portion 51a of the support bracket 51.
In the case of the mounting structure of the third embodiment, the bolts and nuts 57 are loosened, the support bracket 51 is displaced upward, and the movable coupling portions 52b, 52c, 52e, 52f are coupled to the coupling recesses 41, 42, 47, The support bracket 51 and the cover C can be easily removed from the riving knife 40 by removing the extended rear end face facing portion 58 from the mounting base 56 while being extracted from the pallet 48. On the contrary, when the cover C and the support bracket 51 are attached to the riving knife 40, the movable coupling portions 52b, 52c, 52e, 52f are inserted into the corresponding coupling concave portions 41, 42, 47, 48 from above, The support bracket 51 may be displaced downward, and then the bolt / nut 57 may be tightened.
Also in the case of the attachment structure of the third embodiment, the movable coupling parts 52b, 52c, 52e, 52f are inserted without protruding from the side surface of the riving knife 40. The entire range of the bing knife 40 (the range up to the upper end portion 40U) can be effectively functioned to prevent kickback.

Next, FIGS. 12-16 has shown the attachment structure of 4th Embodiment. The attachment structure of the fourth embodiment corresponds to an embodiment of the invention described in claims 7 to 9 or claim 12 of the claims. Also in the attachment structure of the fourth embodiment, the cover C is attached to the riving knife 70 via the support 60 so as to be opened and closed up and down. In the case of the fourth embodiment, two fixing holes 70 a and 70 b are formed in the upper part of the riving knife 70. The riving knife 70 is fixed to a mounting base 56 (see FIG. 11) whose lower end is below the table 102 and supports the cutting blade 103 so that it can be raised and lowered.
14 to 16 show details of the support tool 60. The support 60 has a support shaft 64. The cover C is supported via the support 64 so as to be opened and closed up and down. The support 60 has a configuration in which an intermediate plate 63 is sandwiched between two outer plates 61 and 62. The two outer plates 61 and 62 and the intermediate plate 63 are fixed to each other by fixing bolts 65 and 65. The outer plates 61 and 62 are provided with recesses 61f and 62f, and the intermediate plate 63 is exposed in the recesses 61f and 62f. The support shaft 64 is attached to the intermediate plate 63 at the exposed portion. A cover C is attached via the support shaft 64 so as to be opened and closed vertically.
The lower side of the intermediate plate 63 is missing in a certain range. For this reason, an insertion recess 66 for inserting the upper portion of the riving knife 70 is formed between the outer plates 61 and 62 and at the lower portion of the support 60. When the upper part of the riving knife 70 is inserted into the insertion recess 66, the fixing holes 70 a and 70 b are also positioned in the insertion recess 66. Engaging protrusions 61a, 61b, 62a, 62b are formed on both outer plates 61, 62 corresponding to both the fixing holes 70a, 70b. The engagement protrusion 61a and the engagement protrusion 62a, and the engagement protrusion 61b and the engagement protrusion 62b are protruded into the insertion recess 66 so as to face each other.
Both outer plates 61 and 62 have moderate elasticity in the thickness direction in the range where the insertion recess 66 is formed. The upper part of the riving knife 70 can be inserted into the insertion recess 66 against this elasticity. When the upper portion of the riving knife 70 is inserted into the insertion recess 66, the upper portion is elastically sandwiched between the outer plates 61 and 62. In this sandwiched state, the engaging protrusions 61a and 62a are fitted into the fixing hole 70a of the riving knife 70 from both sides, and the engaging protrusions 61b and 62b are fitted into the fixing hole 70b from both sides. The upper portion of the riving knife 70 is restricted from moving in the surface direction (particularly in the direction of removal). However, the riving knife 70 can be extracted from the insertion recess 66 against the elasticity of the outer plates 61 and 62.

Next, the support 60 is provided with a lever 67. The lever 67 is supported via a support shaft 68 so as to be tiltable up and down. As shown in FIG. 16, the lever 67 is formed by integrating two lever plates 67a and 67a, and both lever plates 67a and 67a are positioned outside the outer plates 61 and 62, respectively. For this reason, when the lever 67 is tilted, the lever plates 67a and 67a move along the surface direction with a slight gap between the outer plates 61 and 62 and the outer surfaces.
Opposite to the lever plates 67a and 67a, pressing protrusions 61c and 62c having a substantially hemispherical shape are formed in a range where the insertion concave portions 66 of the two outer plates 61 and 62 are formed. Both the pressing protrusions 61c and 62c are protruded toward the lever plate 67a. For this reason, as shown in FIG. 15, when the lever 67 is tilted and the lever plates 67a and 67a reach the positions (attachment positions) where the lever plates 67a and 67a ride on the pressing protrusions 61c, the outer plates 61 and 62 are inserted. The range in which the concave portion 66 is formed is displaced in a direction in which the concave portion 66 approaches each other against its elasticity, thereby reducing the width of the insertion concave portion 66. As the width of the insertion recess 66 is reduced, the engagement protrusions 61a and 62a approach each other, and the engagement protrusions 61b and 62b approach each other.
Therefore, when the upper part of the riving knife 70 is inserted into the insertion recess 66 and the lever 67 is tilted to the attachment position shown in FIG. 15, the upper part of the riving knife 70 is sandwiched between the outer plates 61 and 62 at the same time. The engaging protrusions 61a and 62a are fitted into the fixing hole 70a from both sides, and the engaging protrusions 61b and 62b are fitted into the fixing hole 70b from both sides, so that the support tool 60 cannot be detached from the riving knife 70. Attached to.
The attachment position of the lever 67 is regulated by the stopper portion 67c provided on the tilting tip side of the lever 67 coming into contact with the upper end surfaces of the outer plates 61 and 62. The tilt range is restricted.
On the other hand, as shown in FIG. 14, the lever 67 is tilted upward from the attachment position, and the lever plates 67a and 67a reach the positions (removal positions) where the lever plates 67a and 67a are disengaged from the pressing protrusions 61c and 62c, respectively. Then, the range in which the insertion recesses 66 of both the outer plates 61 and 62 are formed is returned in the direction away from each other due to its elasticity, and the engaging protrusions 61a, 62a, 61b and 62b are fixed to the riving knife 70, respectively. By separating from the holes 70a and 70b, the upper part of the riving knife 70 can be extracted from the insertion recess 66, so that the support 60 and thus the cover C can be removed from the riving knife 70.
Similarly, hemispherical holding projections 61d and 62d are provided on the outer surfaces of the outer plates 61 and 62 at positions corresponding to the removal positions of the lever 67 in a state of protruding toward the lever plate 67a. In addition, a holding hole 67b into which the top portions (tip portions) of the holding projections 61d and 62d are fitted is formed at approximately the center in the longitudinal direction of both lever plates 67a and 67a. When the lever 67 is tilted to the removal position, the tops of the holding projections 61d and 62d are fitted into the holding holes 67b and 67b, whereby the lever 67 is held at the removal position.
In addition, stopper pins 61e and 62e are provided on the intermediate plate 63 exposed in the recesses 61f and 62f of the outer plates 61 and 62 so as to protrude to both sides. The both ends of the lever 67 are regulated by the stopper pins 61e and 62e.

According to the mounting structure of the fourth embodiment configured as described above, the lever 67 is moved with the upper portion of the riving knife 70 inserted into the insertion recess 66 of the support 60 as shown in FIGS. By holding in the mounting position, the support 60 and thus the cover C are held in a state of being attached to the riving knife 70.
When removing the cover C from the riving knife 70, as shown in FIG. 14, the lever 67 is tilted upward and moved to the removal position. When the lever 67 is tilted to the removal position, the pressing of the pressing protrusions 61c and 62c by the lever plates 67a and 67a is released, and the range in which the insertion recesses 66 of the outer plates 61 and 62 are formed is mutually elastic. , So that the width of the insertion recess 66 is widened. When the width of the insertion recess 66 is widened, the engagement protrusions 61a, 62a, 61b, 62b are detached from both the fixing holes 70a, 70b of the riving knife 70, and the upper portion of the riving knife 70 is extracted from the insertion recess 66. Thus, the support 60 and cover C can be removed from the riving knife 70 as shown in FIG.
In order to attach the removed cover C to the riving knife 70 again, the upper part of the riving knife 70 is inserted into the insertion recess 66 and the support tool 60 is attached to the riving knife 70, and in this attached state, the lever 67 is moved to the attachment position. Tilt operation may be performed. When the lever 67 is tilted to the attachment position, the pressing projections 61c and 62c are pressed by the lever plates 67a and 67a, so that the width of the insertion recess 66 is reduced. When the width of the insertion recess 66 is reduced, the engaging protrusions 61 a, 62 a, 61 b, 62 b are fitted in the fixing holes 70 b, 70 b of the riving knife 70, and the support tool 60 is fixed so as not to be detached from the riving knife 70. Accordingly, the cover C is firmly attached to the riving knife 70.
As described above, the cover C can be easily removed from the riving knife 70 also by the attachment structure of the fourth embodiment, so that the grooving process can be performed with the riving knife 70 left as it is without being removed as in the prior art. It can be carried out. From this, it is possible to perform grooving quickly and efficiently without the trouble of attaching and removing the riving knife as in the prior art.
In addition, since the riving knife 70 is sandwiched between the outer plates 61 and 62 by the tilting operation of the lever 67 and the support 60 is fixed to the riving knife 40, a conventional screw tightening tool is not used. Cover C can be attached and detached.
Various modifications can be made to the fourth embodiment. For example, the lever 67 that tilts up and down is illustrated, but a support may be attached and removed by a lever that moves in parallel up and down.

Next, FIGS. 17 to 20 show a fifth embodiment of the present invention. The fifth embodiment corresponds to an embodiment of the invention described in claims 10, 11 or 12 of the claims. The cover C can be easily attached to and removed from the riving knife 90 also by the attachment structure of the fifth embodiment. The cover C is attached to the riving knife 90 via the support tool 80.
The support 80 includes a mounting base 81 and a sandwiching base 82. A cover C (not shown in FIGS. 17 to 20) is supported through a support shaft 86 provided on the mounting base 81 so as to be opened and closed vertically.
A screw shaft 83 is attached to the attachment base 81. The screw shaft 83 is inserted through the sandwiching base 82. A nut 84 is screwed into a portion protruding from the sandwiching base 82 of the screw shaft 83. A lever 85 is fixed to the nut 84. The nut 84 can be rotated by rotating the lever 85, whereby the nut 84 can be rotated with respect to the screw shaft 83. When the lever 85 is rotated to the attachment position indicated by the solid line in FIG. 17, the nut 84 is tightened with respect to the screw shaft 83 and the sandwiching base 82 is fixed to the attachment base 81 in an overlapping state. When the lever 85 is rotated to the detaching position indicated by the two-dot chain line in FIG. 17, the nut 84 is loosened with respect to the screw shaft 83 and the sandwiching base 82 can be displaced with respect to the mounting base 81. The mounting base 81 is provided with an engaging ridge 81a and a supporting ridge 81b in a state of being sandwiched and protruding toward the base 82 side. The engaging protrusion 81a is formed so that it can be inserted into a long groove-shaped engaging recess 90a provided on the upper part of the riving knife 90 with little play. The support protrusion 81b is provided on the opposite side of the engagement protrusion 81a with respect to the screw shaft 83. When the lever 85 is pivoted to the removal position so that the sandwiching base 82 is displaceable with respect to the mounting base 81, the sandwiching base 82 can be tilted with the support protrusion 81b as a fulcrum. Can be moved closer to the engaging ridge 81a and separated from each other.
The attachment base 81 is formed with stepped portions 81 a and 81 d for contacting the upper end portion and the rear end portion of the riving knife 90 and positioning the support 80 with respect to the riving knife 90. Yes.

19 and 20, the upper end portion of the riving knife 90 is brought into contact with the contact portion 81c of the mounting base 81, the rear end portion of the riving knife 90 is brought into contact with the contact portion 81d, and When the lever 85 is rotated to the attachment position with the engagement protrusion 81a fitted in the engagement recess 90a, the nut 84 is fastened to the screw shaft 83 and the pinching base 82 is overlapped with the attachment base 81. Pressed in the mating direction. In this pressed state, the sandwiching base 82 is fixed to the mounting base 81 in an overlapped state via the engagement protrusions 81a and the support protrusions 81b arranged on both sides with respect to the screw shaft 83, and the support tool 80 is fixed. The cover C is fixed to the upper part of the riving knife 90, and as a result, the cover C is firmly attached to the riving knife 90.
On the other hand, in order to remove the cover C from the riving knife 90, when the lever 85 is rotated to the removal position shown by the two-dot chain line in FIG. 19, the nut 84 is loosened with respect to the screw shaft 83, so 82 can be displaced with respect to the mounting base 81. In this state, the sandwiching base 82 can be tilted about the support protrusion 81b. Therefore, when the user pushes the upper end portion of the sandwiching base 82 (above the support protrusion 81b), the front end side (the lower side in the drawing) is engaged with the support base 81b as a fulcrum. It can be tilted in a direction away from the strip 81a.
By tilting the sandwiching base 82 to the removal side in this way, the support tool 80 can be removed from the riving knife 90 while extracting the engagement protrusion 81a from the engagement recess 90a, and thus the cover C can be removed from the riving knife 90. Can be removed.
As described above, the cover C can be easily attached to and removed from the riving knife 90 also by the attachment structure of the fifth embodiment. Therefore, when performing grooving, it is necessary to remove the riving knife together as in the prior art. Therefore, grooving can be performed more quickly and efficiently than in the past.
Further, since the support tool 80 is fixed to the riving knife 90 by sandwiching the riving knife 90 between the mounting base 81 and the sandwiching base 82 by the tilting operation of the lever 85, a conventional screw tightening tool is used. The cover C can be attached and detached without using.

It is a figure which shows the attachment structure which concerns on 1st Embodiment of this invention, Comprising: It is a side view which shows the state which attached the support tool with respect to the riving knife. It is a figure which shows 1st Embodiment, Comprising: It is a side view of the said support tool and riving knife in the state which removed the support tool. It is the (3)-(3) arrow line view of FIG. 2, Comprising: It is the figure which looked at the said support tool and riving knife in the state which removed the support tool from the cutting progress direction front side. It is a (4)-(4) arrow directional view of FIG. 1, Comprising: It is a cross-sectional view which shows the engagement state of each connection part of the connection plate with respect to the connection recessed part of a riving knife. It is a (5)-(5) arrow directional view of FIG. 1, Comprising: It is a longitudinal cross-sectional view which shows the engagement state of the guide protrusion by the side of a support tool with respect to the guide recessed part of a riving knife. It is a figure which shows the attachment structure which concerns on 2nd Embodiment, Comprising: It is a side view which shows a mounting state with respect to the riving knife. It is a figure which shows 2nd Embodiment, Comprising: It is a side view of the support tool and the riving knife in the state which removed the support tool. It is the (8)-(8) sectional view taken on the line of FIG. 7, Comprising: It is a longitudinal cross-sectional view of a coupling board. It is the figure which looked at the upper end surface of the riving knife from the arrow (9) direction of FIG. It is the figure which looked at the rear-end surface of the riving knife from the arrow (10) direction of FIG. It is a figure which shows 3rd Embodiment of this invention, Comprising: It is a side view which shows the state which attached the support tool with respect to the riving knife. It is a figure which shows 4th Embodiment of this invention, Comprising: It is a side view which shows the state which removed the cover and the support tool from the riving knife. It is a figure which shows 4th Embodiment, Comprising: It is a side view which shows the state which attached the cover to the riving knife. It is a side view of the support tool concerning a 4th embodiment. This figure shows a state in which the lever is tilted to the removal position. It is a side view of the support tool concerning a 4th embodiment. This figure shows a state in which the lever is tilted to the attachment position. It is the (16)-(16) line arrow directional view of FIG. It is a figure which shows the attachment structure which concerns on 5th Embodiment of this invention, Comprising: It is a side view of the support tool and the riving knife in the state which removed the cover from the riving knife. It is the rear view which looked at the state which removed the cover from the riving knife from the arrow (18) direction of FIG. It is a side view of a support and a riving knife in a state where a cover is attached to the riving knife. It is the rear view which looked at the state which attached the cover to the riving knife from the arrow (20) direction of FIG. It is a figure which shows the conventional cover attachment structure, Comprising: It is a side view of the cutting blade periphery of a cutting machine. It is a top view of the cutting blade periphery of a cutting machine. It is a side view of the riving knife which concerns on the conventional attachment structure. It is a top view of the riving knife which concerns on the conventional attachment structure.

Explanation of symbols

W ... Cutting material C ... Cover 2 ... Table 3 ... Cutting blade 10 ... Riding knife (first embodiment)
10U ... upper end surfaces 11-14 ... coupling recesses, 11a-14a ... grooves, 11b-14b ... engagement holes 15 ... guide recesses 20 ... support (first embodiment)
DESCRIPTION OF SYMBOLS 21 ... Support bracket, 21a ... Accommodating recessed part 22 ... Screw 23 ... Wing nut 24 ... Holding block 25 ... Support shaft 26 ... Connecting pin 27 ... Guide protrusion 30 ... Connecting plate 31-34 ... Connecting part, 31a-34a ... Arm part , 31b to 34b ... engaging portion 40 ... riving knife (second embodiment)
40U: upper end surface, 40K: rear end surfaces 41, 42, 47, 48 ... coupling recess (upper end surface 40U side)
41a, 42a, 47a, 48a ... front (relief)
43 to 46: coupling recess (rear end face 40K side)
50 ... Supporting tool (second and third embodiments)
51 ... Support bracket 51a ... Upper end facing part, 51b ... Rear end face facing part, 51c to 51f ... Fixed coupling part 52 ... Coupling plate 52a ... Lever part, 52b, 52c, 52e, 52f ... Moving coupling part, 52d ... Guide part 53 ... support shaft 54 ... torsion spring 55 ... support shaft 56 ... mounting base 57 ... bolt / nut 58 ... extended rear end face facing portion 60 ... support (fourth embodiment)
61, 62 ... outer plates 61a, 61b, 62a, 62b ... engaging projections, 61c, 62c ... pressing projections 61d, 62d ... holding projections, 61e, 62e ... stopper pins, 61f, 62f ... recess 63 ... intermediate plate 64 ... support shaft 65 ... fixing bolt 66 ... insertion recess 67 ... lever, 67a ... lever plate, 67b ... holding hole, 67c ... stopper 68 ... support shaft 70 ... riving knife (fourth embodiment)
70a, 70b ... fixing hole 80 ... support (fifth embodiment)
81 ... Mounting base 81a ... Engagement ridge, 81b ... Supporting ridge, 81c, 81d ... Abutment portion 82 ... Pinch base 83 ... Screw shaft 84 ... Nut 85 ... Lever 86 ... Support shaft 90 ... Riding knife (fifth) Embodiment)
90a ... engaging recess 100 ... cutting machine 102 ... table 103 ... cutting blade 104 ... riving knife 106 ... support block 107 ... fixing screw 108 ... nut

Claims (12)

The cutting blade is a riving knife that has a flat plate shape, is arranged flush with the cutting blade on the rear side in the cutting progress direction of the cutting blade, and enters the cutting port immediately after cutting to hold the cutting port at a constant width. Is a structure for attaching a cover covering the opening and closing via a support,
The support includes a support bracket that comes into contact with an upper end surface of the riving knife, and a coupling plate that is supported by the support bracket so as to be movable in the surface direction of the riving knife,
The coupling plate has a plurality of frustoconical coupling portions having side faces that are the same as or smaller in thickness than the riving knife and inclined in the plate thickness direction, alternately in the inclined direction and along the cutting progress direction. While preparing
The riving knife has a frustoconical coupling recess having an inner peripheral surface inclined in the plate thickness direction corresponding to the coupling portion, and is alternately opposite in the inclination direction on one side surface and the other side surface. A plurality is provided along the cutting progress direction,
The support bracket is brought into contact with the upper end surface of the riving knife, and the plurality of coupling portions are inserted into the corresponding coupling recesses so as to be engaged in the plane direction without protruding from the side surfaces of the riving knife. The cover mounting structure configured to press and hold the support bracket on the upper end surface of the riving knife while pulling and holding the coupling plate upward with respect to the support bracket in the engaged state. The mounting structure according to claim 1, wherein the coupling plate is movably supported by fastening a fixing screw to the support bracket, and the coupling plate is fastened to the support bracket by tightening the fixing screw. The cover mounting structure configured to press and hold the support bracket on the upper end surface of the riving knife using the tightening force of the fixing screw while being pulled up and held. 2. The mounting structure according to claim 1, wherein a guide recess having a V-shaped cross section is provided along an upper end surface of the riving knife, and a guide protrusion having a V-shaped cross section is provided on the lower surface of the support bracket. A mounting structure in which the support bracket is brought into contact with the upper end surface of the riving knife by causing the guide bracket to enter the guide recess. The cutting blade is a riving knife that has a flat plate shape, is arranged flush with the cutting blade on the rear side in the cutting progress direction of the cutting blade, and enters the cutting port immediately after cutting to hold the cutting port at a constant width. Is a structure for attaching a cover covering the opening and closing via a support,
The support comprises a support bracket having an upper end surface facing portion facing the upper end surface of the riving knife and a rear end surface facing portion facing the rear end surface;
A coupling plate is provided at the upper end surface facing portion of the support bracket so as to be rotatable in the surface direction of the riving knife, and a plurality of fixed coupling portions are provided to project toward the riving knife on the other side,
In the coupling plate, a plurality of movable coupling parts are provided to project toward the riving knife,
A plurality of coupling recesses in which the fixed coupling portion and the movable coupling portion can be fitted in the upper and rear ends of the riving knife along the surface direction of the riving knife at a certain depth in the plate thickness direction. Provided alternately,
The fixed coupling portion is fitted into a corresponding coupling recess of the riving knife without protruding from the side surface of the riving knife, and the coupling plate is rotated in the fitted state to move the movable coupling portion to the riving knife. The cover mounting structure in which the support bracket is fixed along the upper end surface and the rear end surface of the riving knife by being fitted into the corresponding coupling recesses of the riving knife without protruding from the side surface. The attachment structure according to claim 4, wherein the coupling plate is biased in a direction in which the movable coupling portion is fitted into a corresponding coupling recess. 5. The mounting structure according to claim 4, wherein when the movable coupling portion of the coupling plate is rotated in a direction for separating from the corresponding coupling recess, the coupling plate is slidably contacted with a side surface of the riving knife, An attachment structure provided with a guide for positioning the support in the thickness direction of the riving knife. The cutting blade is a riving knife that has a flat plate shape, is arranged flush with the cutting blade on the rear side in the cutting progress direction of the cutting blade, and enters the cutting port immediately after cutting to hold the cutting port at a constant width. Is a structure for attaching a cover covering the opening and closing via a support,
The support is provided between two outer plates having elasticity in the plate thickness direction, and an insertion recess into which the upper part of the riving knife can be inserted, and when the two outer plates are moved to the attachment position of the cover, A lever that presses in the plate thickness direction and displaces the outer plate in the direction of narrowing the width of the insertion recess;
When the lever is moved to the mounting position with the upper portion of the riving knife inserted in the insertion recess, the upper end portion of the riving knife is sandwiched between the two outer plates and fixed. Mounting structure. 8. The attachment structure according to claim 7, wherein an engagement protrusion is provided on an inner surface of the two outer plates to be fitted in a fixing hole provided in an upper part of the riving knife. The mounting structure according to claim 7, wherein a pressing protrusion is provided on an outer surface of the two outer plates, and when the lever is moved to the mounting position, the pressing protrusion is pressed by the lever so that the two outer plates are moved. Mounting structure that is displaced in the direction of narrowing the width of the insertion recess. The cutting blade is a riving knife that has a flat plate shape, is arranged flush with the cutting blade on the rear side in the cutting progress direction of the cutting blade, and enters the cutting port immediately after cutting to hold the cutting port at a constant width. Is a structure for attaching a cover covering the opening and closing via a support,
The support includes a mounting base that sandwiches an upper portion of a riving knife, a sandwiching base, a screw shaft that is provided on the mounting base, and that is inserted through the sandwiching base, and a lever that rotates a nut mounted on the screw shaft. Prepared,
A mounting structure in which when the lever is rotated to a cover mounting position, the nut is tightened on the screw shaft, and the sandwiching base is displaced in a direction to sandwich the riving knife between the mounting base and the nut. 11. The attachment structure according to claim 10, wherein an engagement protrusion that fits into an engagement recess provided on an upper portion of the riving knife on the attachment base, and the engagement protrusion with respect to the screw shaft. A mounting structure in which a support ridge is provided on the opposite side, and the sandwiching base is tilted with the support ridge as a fulcrum so as to approach and separate from the mounting base. The cutting blade is a riving knife that has a flat plate shape, is arranged flush with the cutting blade on the rear side in the cutting progress direction of the cutting blade, and enters the cutting port immediately after cutting to hold the cutting port at a constant width. Is a structure for attaching a cover covering the opening and closing via a support,
The support is a cover mounting structure in which the riving knife is sandwiched between two members and attached to the riving knife, and the two members are sandwiched by a lever operation.

Images