JPH10180701A - Circular saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform accurate movement by simply working or assembling mechanism for tilting or vertically moving a saw blade of a circular saw machine. SOLUTION: An upper block 61 ejected down in a semicircular section is formed on a rear surface of a table 5, and a lower block 67 having a circular arc-like recess 6 is screw-clamped fixedly at the rear surface of the table 5 so as to form a circular arc-like groove 63 between the block 67 and the block 61. A circular arc-like protruding piece 69 mounted with a leaf spring 71 on a lower surface with a slightly smaller width than the groove 63 is fixed to a saw blade hood 21. The piece 69 is brought into close contact with the groove 63 by the spring 71 to accurately set a tilting center. An assembling structure is adopted for a support of a guide bar 25 for supporting the vertical movement, and requirements for working and assembling accuracies are alleviated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw machine, and more particularly to a structure of a mechanism for changing the inclination and height of a circular saw blade.

[0002]

2. Description of the Related Art Generally, in a circular saw machine, a tilting mechanism for tilting a circular saw blade with respect to a table surface and a height of a circular saw blade exposed on a table are set. A vertical movement mechanism for changing the position is provided.

In the tilting of the circular saw, it is necessary to tilt the intersection of the table surface and the blade of the circular saw about the center of rotation. For example, a device shown in Japanese Utility Model Laid-Open No. 55-52302 has been devised. I have. Specifically, FIG.
A guide 1 having an arc-shaped concave groove 101 as shown in FIG.
02 on the table side, and as shown in FIG.
An arc-shaped protruding piece 104 that fits exactly into the concave groove 101 is fixed to the frame 103 side for accommodating the circular saw blade, and the tilting center is defined.

[0004] The vertical movement of the circular saw has been devised, for example, as disclosed in Japanese Utility Model Laid-Open No. 48-106582. Specifically, as shown in FIG.
1, the guide column 112 is fixed, and the motor column 113 is moved up and down accurately using the guide column 112 as a guide. Both ends of the guide column 112 are firmly fitted in fitting holes 114 formed in the body 111 to determine the axis of vertical movement.

According to these conventional techniques, the circular saw can be accurately tilted and moved up and down. For example, in order to obtain an accurate tilting center in the configuration shown in FIG.
And the protruding piece 104 are both finished with high precision, and the guide 102 and the protruding piece 104 are each set on a table (not shown).
In addition, there is a problem that it is necessary to fix the frame to the frame 103 with high accuracy, and a large number of steps are required for processing and assembly.

In order to obtain an accurate vertical movement axis in the configuration shown in FIG. 9, it is necessary to finish the inner diameter of the fitting hole 114 and the outer diameter of the guide column 112 with high precision, and
14 has to be formed at an accurate position with respect to the body 111, and there has been a problem that a large number of man-hours are required for processing and assembly.

Accordingly, an object of the present invention is to make it possible to easily process and assemble a mechanism for changing the positional relationship of a saw blade of a circular sawing machine, and to achieve a highly accurate movement. And

[0008]

Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention According to the first aspect of the present invention, which has been made to achieve the above object, the invention is mounted on the lower surface of a table and accommodates a lower portion of a circular saw blade. A saw blade hood, a guide block mounted on the table side so as to be located before and after the saw blade hood, and a guide block for forming an arc-shaped groove, and mounted on the saw blade hood side facing the guide block. A circular saw having an arc-shaped protruding piece fitted into the arc-shaped groove and a tilt drive mechanism for tilting the saw blade hood, wherein the guide block has an arc surface as a lower surface. And a lower block having an upper surface with an arc surface having a different radius from the arc surface of the upper block by a predetermined distance, and the upper and lower blocks correspond to the difference in the radius in the vertical direction. The arc-shaped groove is formed by arranging the arc-shaped groove at a constant distance, and the arc-shaped protruding piece is formed in an arc shape having a width narrower than that of the arc-shaped groove formed between the upper and lower blocks. By attaching the elastic body to either the upper surface or the lower surface of the arc-shaped protruding piece, it is possible to fit the lower surface or the upper surface of the arc-shaped groove between the upper and lower blocks while pressing the arc-shaped protruding member. Features.

Here, for example, a leaf spring can be adopted as the elastic body. Further, as the arc-shaped groove, for example, a downwardly convex arc-shaped groove may be formed having a radial center at a position where the upper surface of the table and the circular saw blade intersect, or conversely, It may be a convex arc-shaped groove. When a downwardly convex arc-shaped groove is used, a block having an arc surface as a lower surface is employed as the upper block, and a block having an arc surface having a radius larger than that of the upper block as an upper block is employed as the lower block. The upper and lower blocks may be arranged so as to be separated from each other by a difference in radius in the vertical direction.

According to the circular saw of the first aspect, for example, when a convex arc-shaped groove is formed downward and a leaf spring as an elastic body is attached to the lower surface side of the arc-shaped protruding piece, the upper block is not required. However, if the arc surface finish accuracy and the placement accuracy with respect to the table top surface are sufficiently increased, the leaf spring spring accuracy can be maintained at a lower level even if the arc surface finish accuracy of the lower block upper surface and the lower block mounting accuracy are not so high. Since the state in which the arc-shaped protruding piece is in close contact with the lower surface of the upper block can be maintained by the pressing force, an accurate tilting center can be obtained.

According to a second aspect of the present invention, which is provided to achieve the above object, the invention is mounted on a lower surface of a table,
A saw blade hood accommodating a lower portion of the circular saw blade, a guide bar fixed at both ends to the saw blade hood, and supporting a motor housing of a circular saw driving motor so as to be able to move up and down along the saw blade hood; In a circular sawing machine including a screw feed mechanism for moving the motor housing up and down along the saw blade hood, an inner block provided on the saw blade hood side and having an outer opening recess capable of receiving the guide bar, By combining with the inner block, an outer block having an inner opening recess that forms a storage hole for accommodating the guide bar in cooperation with the outer opening recess, the guide bar and the recess of the outer block are used. The guide bar is fixed to the saw blade hood so as to be sandwiched between the inner block and the concave portion.

According to the circular sawing machine of the second aspect, by making either the recess of the outer block or the recess of the inner block slightly shallow, the guide bar can be firmly assembled when the inner and outer blocks are assembled. Can be sandwiched. Therefore, the guide bar can be easily assembled so as to guide the screw feed mechanism.

According to a third aspect of the present invention, there is provided a saw blade hood mounted on a lower surface of a table for accommodating a lower portion of a circular saw blade, and having both ends attached to the saw blade hood. A round bar comprising: a fixed guide bar for supporting a motor housing of a circular saw driving motor so as to be vertically movable along the saw blade hood; and a screw feed mechanism for vertically moving the motor housing along the saw blade hood. In the sawing machine, an inner block provided on the saw blade hood side and having an outwardly open concave portion capable of receiving the guide bar, a recess formed with a width larger than the diameter of the guide bar of the guide bar, and a recess formed in the recess. By fitting a cushioning material, an inner opening that forms a storage hole for storing the guide bar in combination with the outer opening recess by being combined with the inner block. Using an outer block having a recess, sandwiching the guide bar between the recess of the recess and the inner block of the outer block, characterized in that the guide bar is fixed to the saw blade hood.

In the circular saw machine according to the third aspect, even if there is insufficient processing accuracy due to deformation of the cushioning material, this is absorbed, so that the circular sawing machine can be naturally adjusted to the correct mounting position. Thus, each circular saw of the present invention,
In the support structure required for accurate movement of the circular saw, high-precision processing and high-precision positioning are not required, and the number of processing steps and assembly steps can be significantly reduced.

In the circular saw according to the third aspect, the motor housing is further supported via the cushioning material, so that the vibration of the motor at the time of starting the motor is less likely to be transmitted to the guide bar. Therefore, it is difficult for the vibration at the time of starting the motor to be transmitted to the saw blade hood to which the guide bar is fixed.
Such vibrations are hardly transmitted to the table on which the saw blade hood is supported. Therefore, in the circular sawing machine according to the third aspect, in addition to the above-described effects in processing and assembling, an effect of suppressing vibration of the table at the time of starting the motor is also exerted.

Further, in the circular sawing machine according to the second and third aspects, it is preferable that the concave portion of the inner block has a shape having a play in the left-right direction so that the guide bar can move right and left. By doing so, the upper and lower positions of the guide bars can be adjusted to the left and right, and if there are two or more guide bars, they can be fixed so as to be parallel to each other. In this case, when the outer block and the inner block are further fixed with screws, if the outer block is provided with a screw insertion hole which is a long hole in the left-right direction, the adjustment becomes easier.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, in order to further clarify the embodiments of the present invention, an embodiment of a circular saw to which the present invention is applied will be described with reference to the drawings. As shown in FIG. 1, the circular saw 1 according to the embodiment includes:
A circular saw 3 driven by a motor, a table 5 on which the circular saw 3 is mounted together with the motor, and a table 5 which covers the upper side and the side of the circular saw 3 so that the circular saw 3 can be pushed open by the workpiece W at the time of cutting. A safety cover 7 rotatably mounted above, a split blade 9 mounted behind the circular saw 3, and a split blade 9 for keeping the cut end of the workpiece W cut by the circular saw 3 from closing; Dustproof plate 10 fixed to the top of blade 9
And

The dustproof plate 10 is manufactured by pressing a metal plate. As shown in FIGS. 1 to 3, the dustproof plate 10 fits inside the safety cover 7 and has a width B sufficiently large with respect to the thickness t of the circular saw 3. Have. A descending portion 11 descending to the vicinity of the top of the circular saw 3, a rising portion 13 rising upward from an end point of the descending portion 11, and provided on the descending portion 11 and extending along the blade above the blade of the circular saw 3. An opening 15 is provided. In addition,
The opening 15 has a width b sufficiently large with respect to the thickness of the blade of the circular saw 3.
Having. Accordingly, as shown in FIG.
5 through the dustproof plate 10. The top of the dust-proof plate 10 is surrounded by the safety cover 7 on the upper side and the side, and the front is also surrounded by the rising portion 13. For this reason, the chips are guided into a space surrounded by the surroundings, and are prevented from scattering to the outside. Most of the chips generated at the time of cutting are stored in the saw blade hood 21, but due to the wind generated by the rotation of the saw blade, the chips are cut on the upper surface of the table 5 through the cut of the material to be cut along the saw blade. Soar up. If the opening 15 of the dustproof plate 10 is not provided, FIG.
As shown by the alternate long and short dash line in (b), the chips generated at the time of cutting hit the dustproof plate 10 and fly to the worker side along the dustproof plate 10. However, in this embodiment, the swarf passes through the opening 15 and rises 1 as indicated by the solid arrow.
Since it hits the back side of No. 3, it does not fly to the worker side. .

In the circular saw machine 1 of this embodiment, as shown in FIGS. 1 and 2, the lower portion of the circular saw 3 is housed in a saw blade hood 21 which is attached to the table 5 so as to be tiltable. Have been. A motor housing 23 containing a motor is attached to one side of the saw blade hood 21. The motor housing 23 is mounted via a guide bar 25 so as to be vertically movable at a position slightly away from the saw blade hood 21.

Here, the split blade 9 is mounted on the motor housing 23.
Is fixed to a bracket 27 which is bolted to the rear end. Accordingly, when the height of the circular saw 3 exposed on the table is changed by moving the motor housing 23 up and down, the split blade 9 also moves up and down accordingly. As the split blade 9 moves up and down, the dustproof plate 10 also moves up and down. Therefore, as shown in FIG. 4, even if the thickness of the workpiece W changes and the circular saw 3 is moved in the vertical direction, the interval between the dust-proof plate 10 and the circular saw 3 does not change, so that a favorable condition is always obtained. Dustproof performance can be exhibited.

Next, a mechanism for vertically moving the motor housing 23 will be described. The motor housing 23 is
By rotating a handle 31 provided so as to protrude to the front of the table 5 (the right side in FIG. 1), it moves up and down. The rotation shaft 33 of the handle 31 is coaxial with the rotation shaft 37 of the tilt dial 35. A bevel gear 39 is attached to the tip of the rotating shaft 33 of the handle 31. The bevel gear 39 is meshed with a bevel gear 43 provided at the lower end of a screw shaft 41 extending in the vertical direction.

The screw shaft 41 is fixed vertically to the saw blade hood 21 and only rotates on the spot. However, as shown in FIG. 5, a nut member 45 having an inner thread is engaged with the screw shaft 41. And
The nut member 45 is fixed to the motor housing 23 described above. As a result, when the handle 31 is rotated,
The motor housing 23 moves up and down by the screw feed mechanism of the screw shaft 41 and the nut member 45. The above-described guide bar 25 has a function of guiding this vertical movement.

Next, the tilting of the circular saw 3 will be described. The saw blade hood 21 containing the circular saw 3 is tilted by rotating a tilt dial 35 provided coaxially with the handle 31. As a configuration for this purpose, a plate 53 to which an arc gear 51 is fixed is attached to the front side of the table 5. The plate 53 is provided with an arc-shaped slit 55 along the arc gear 51. The rotation shaft 33 of the above-described handle 31 passes through the slit 55 to the back. The rotation shaft 37 of the tilt dial 35 has a pinion gear 57 meshing with the arc gear 51.
Has been fixed. As a result, when the tilt dial 35 is rotated, the pinion gear 57 moves along the arc of the arc gear 51, and the saw blade hood 21 tilts accordingly.

Here, the tilting movement is designed so that the point X where the upper surface of the table 5 and the circular saw 3 intersect is set as the tilting center. As a configuration for that, as shown in FIG.
An upper block 61 protruding downward in a semicircular cross section is formed on the back surface of the table 5, and a lower block 67 having an arc-shaped recess 65 is formed on the table 5 so as to form an arc groove 63 between the upper block 61 and the upper block 61. Screwed to the back of The saw blade hood 21 has an arc-shaped protruding piece 69 that fits in the arc groove 63. The arc-shaped projecting piece 69 has a slightly smaller width than the arc-shaped groove 63, and a leaf spring 71 is mounted on the lower surface. By the leaf spring 71, the arc-shaped protruding piece 69 is brought into close contact with the inside of the arc groove 63, and in particular, comes into close contact with the lower surface of the upper block 61.

Also, projections 69a are provided at both ends of the arc-shaped projecting piece 69 so that the leaf spring 71 does not come off from the arc-shaped projecting piece 69. The lower surface of the upper block 61 is accurately finished as an arc surface centered on the point X. Also,
The upper surface of the protruding piece 69 on the side of the saw blade hood 21 is also finished with sufficient precision so as to draw an arc equal to the radius of the upper block 61. On the other hand, the finishing accuracy of the depression 65 of the lower block 67 does not need to be so important. In addition, the mounting accuracy of the lower block 67 does not need to be considered so much. Finish accuracy of the recess 65 of the lower block 67 and the lower block 6
Even if the mounting accuracy of the 7 is somewhat rough, the lower surface of the upper block 61 and the upper surface of the convex portion 69 can be brought into close contact with each other by the leaf spring 71, so that the saw blade hood 21 can be tilted accurately about the point X. Because you can do it.

When the upper block 61 and the saw blade hood 21 are of the same quality (for example, both members are made of aluminum alloy)
In this method, a sliding sheet 84 made of a material harder than the upper block 61 or the saw blade hood 21 is inserted between the upper block 61 and the saw blade hood 21 because the friction of the sliding surface increases due to affinity and the surface becomes rough and does not move. It prevents roughening.

The upper block 61, the lower block 67, and the arc-shaped protruding piece 69 are provided at positions before and after the circular saw 3, respectively, as shown in FIG. In this manner, in the present embodiment, the finishing accuracy for a member for providing an accurate tilting center for executing accurate tilting is minimized,
In addition, since the upper block 61 and the lower block 67 are assembled, the mounting is easy. Nevertheless, as described above, the tilt center is accurately realized.

In the present embodiment, the following countermeasures are also taken as a device for facilitating assembly and improving operation accuracy. That is the structure of the support portion of the guide bar 25. The guide bar 25 is set on the inner block 74 which is integral with the saw blade hood 21, and the guide bar 25 is fixed with the outer block 75.

The guide bars 25 include a main guide bar 25a and a sub guide bar 25b. Unless these are mounted in parallel, smooth vertical movement cannot be achieved.
Therefore, the following contrivance has been made on the assembly structure of the main guide bar 25a and the sub guide bar 25b.

First, as shown in FIG. 6A, the main guide bar 25a near the screw shaft 41 is formed as an inner block 74a integrated with the saw blade hood 21.
The main guide bar 25a has an arc-shaped outwardly open concave portion 73a that matches the outer peripheral surface of the main guide bar 25a. Then, the main guide bar 25a is attached in accordance with the arc-shaped outwardly opened concave portion 73a, and is fixed by screwing over the outer block 75a. The outer block 75a is formed with an inwardly opened concave portion 76 that can securely pinch the guide bar 25a in cooperation with the outerly opened concave portion 73a.

The other slave guide bar 25b can be adjusted so as to be parallel to the main guide bar 25a.
As shown in FIG. 6B, the tapping screw insertion hole 77 provided in the outer block 75b is formed as a long hole in the left-right direction.
As shown in (c), the concave portion 73b of the inner block 74b is formed as a wide recess having a width C so as to have play in the left-right direction with respect to the guide bar 25b. The above-mentioned problem is solved by making it possible to adjust the position of the main guide bar 25b in parallel with the main guide bar 25a.

As described above, in this embodiment, the saw blade hood 21
By assembling the part supporting the table 5 on the table 5 and the support part of the guide bar 25, it is possible to secure the easiness of mounting parts at the time of manufacturing. Moreover, in order to accurately perform the tilting and the vertical movement even if the manufacturing is facilitated in this manner, the respective support portions are provided with a self-adjustment function by the leaf spring 71 and a self-adjustment function by the long hole 77. I have.
By providing such a self-adjustment function, it has also succeeded in minimizing the finishing accuracy of the components constituting each support portion during tilting and vertical movement.

Next, a modified example will be described. In this modification, as shown in FIG. 7, in the support portion of the guide bar 25, a cushioning material 79b made of synthetic rubber is mounted in a recess 79a of the outer blocks 75c and 75d to form an inwardly opened concave portion 76. You may. In this case, the self-adjusting function is further enhanced by the buffer effect of the synthetic rubber. Also, the cushioning material 79
b also exerts a function of absorbing vibration. Therefore, even if vibration occurs at the time of starting the motor, the vibration is absorbed and weakened by the cushioning material 79b, and the vibration transmitted to the saw blade hood 21 can be reduced. As a result, the vibration at the time of starting the motor becomes difficult to be transmitted to the table 5, and the vibration suppressing effect is also exerted. Also in this modified example, as shown in FIG. 7B, the supporting portion for the slave guide bar 25b has a long hole in the tapping screw insertion hole 77 or a concave portion 7 having play on the left and right.
Although the inner block 74b having the 3b may be used, the buffer 79b can exert a position adjusting function, so that it is not necessary to use a slot or play.

In FIG. 1, reference numerals 81 and 82 denote saw blade hoods 21 for moving the motor housing 23 up and down.
The reference numeral 83 denotes a lock lever for fixing at an inclined position. The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and may be further embodied in various modes.

[Brief description of the drawings]

FIG. 1 is a side view showing a circular saw of an embodiment in a partial cross section.

FIG. 2 is a front view showing the circular saw of the embodiment in a partial cross section.

FIGS. 3A and 3B show a main part of the circular saw machine of the embodiment, in which FIG. 3A is a perspective view and FIG. 3B is a side view.

FIG. 4 is a side view showing the circular saw of the embodiment in a partial cross section.

FIG. 5 is a front view showing the circular saw of the embodiment in a partial cross section.

6A and 6B show a structure of a guide bar supporting portion in the circular saw machine of the embodiment, wherein FIG. 6A is a sectional view, FIG. 6B is a front view, and FIG.
Is a sectional view.

FIG. 7 is a cross-sectional view showing a structure of a guide bar support in a circular saw machine according to a modification.

FIG. 8 is a perspective view showing a structure of a tilting mechanism in a conventional circular saw machine.

FIG. 9 is a perspective view showing the structure of a vertical movement mechanism in a conventional circular saw machine.

[Explanation of symbols]

1 ... circular saw machine, 3 ... circular saw, 5 ... table, 7
... Safety cover, 9 ... Split blade, 10 ... Dustproof plate, 11 ... Downward section, 13 ... Rising section, 15 ...
Opening, 21 saw blade hood, 23 motor housing, 25 (25a, 25b) guide bar, 27
... Bracket, 31 ... Handle, 35 ... Tilt dial, 41 ... Screw shaft, 45 ... Nut member, 51 ... Arc gear, 57 ... Pinion gear
61 ... upper block, 63 ... arc groove, 67 ...
Lower block, 69: arc-shaped protruding piece, 71: leaf spring, 73 (73a, 73b): outer opening concave part, 74 (74a, 74b): inner block, 75
(75a, 75b, 75c, 75d) ··· Outer block, 76 ··· Inwardly open recess, 77 ··· Tapping screw insertion hole (long hole), 78 ··· Screw hole, 79a ·· Recess, 79b · ..Cushioning material, W: Material to be cut.

Claims (3)

[Claims] 1. A saw blade hood mounted on a lower surface of a table and accommodating a lower portion of a circular saw blade, and a saw blade hood mounted on the table side so as to be positioned before and after the saw blade hood to form an arc-shaped groove. A guide block attached to the saw blade hood side facing the guide block, and an arc-shaped protruding piece fitted into the arc-shaped groove; and a tilt drive mechanism for tilting the saw blade hood. In the circular sawing machine provided, the guide block is divided into an upper block having an arc surface as a lower surface, and a lower block having an upper surface having an arc surface having a radius different from that of the upper block by a predetermined distance. The upper and lower blocks are vertically separated from each other by a predetermined distance corresponding to the difference between the radii to form the arc-shaped groove, and the arc-shaped protrusion is disposed between the upper and lower blocks. Along with an arc shape having a width narrower than the formed arc-shaped groove, and by attaching an elastic body to either the upper surface or the lower surface of the arc-shaped protrusion, the lower surface of the arc-shaped groove between the upper and lower blocks or A circular sawing machine wherein the arc-shaped protruding piece is fitted to the upper surface while being pressed against the upper surface. 2. A saw blade hood attached to a lower surface of a table and accommodating a lower portion of a blade of a circular saw, both ends of which are fixed to the saw blade hood, and a motor housing of a circular saw driving motor arranged along the saw blade hood. And a screw feed mechanism for moving the motor housing up and down along the saw blade hood. The circular saw machine is provided on the saw blade hood side and receives the guide bar. Using an inner block having a possible outer opening recess, and an outer block having an inner opening recess forming a storage hole for housing the guide bar in combination with the outer opening recess by combining with the inner block. The guide bar is sandwiched between a concave portion of the outer block and a concave portion of the inner block, and the guide bar is fixed to the saw blade hood. Rumarunokoban. 3. A saw blade hood mounted on a lower surface of a table and accommodating a lower portion of a blade of a circular saw, both ends of which are fixed to the saw blade hood, and a motor housing of a circular saw driving motor is arranged along the saw blade hood. And a screw feed mechanism for moving the motor housing up and down along the saw blade hood. The circular saw machine is provided on the saw blade hood side and receives the guide bar. An inner block having a possible open-out recess, a recess formed with a width larger than the diameter of the guide bar of the guide bar, and a buffer material fitted in the recess to combine the outer block with the inner block. An outer block provided with an inwardly opening concave portion which forms a storage hole for storing the guide bar in cooperation with an open concave portion; Sandwiched between the concave portion of the concave portion and the inner block of the lock, characterized in that the guide bar is fixed to the saw blade hood circular saw.