JP2694432B2 - Tabletop circular saw machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tabletop circular sawing machine, and more particularly, to a main body provided with a circular saw rotated by a drive motor, with respect to a base on which a workpiece is placed. The present invention relates to a tabletop circular sawing machine mounted to be tiltable in the left-right direction.

[0002]

2. Description of the Related Art Conventionally, in this type of tabletop circular saw machine,
Angle cutting work on the work piece on the base with the main body equipped with the circular saw rotated by the drive motor tilted in the left-right direction with respect to the base on which the work piece is placed. In order to achieve this, as disclosed in Japanese Utility Model Laid-Open No. 63-49901, a circular saw machine body is supported so as to be tiltable up and down, and a circular arc is formed on a support arm (hinge) attached so as to be tiltable left and right with respect to a base. A structure has been proposed in which a long hole is formed and a vertical position and a lateral tilting position of a support arm with respect to a base are fixed by tightening a screw fitted in the long hole.

However, in such a structure, the vertical position of the support arm with respect to the base is retained by tightening the screw at the central position of the elongated hole, and the vertical position cannot be accurately positioned. Moreover, the adjustment work is very troublesome because the adjustment must be performed every time the tilted position is returned to the vertical position. Further, since such position holding in the vertical position depends only on the tightening of the screw, the position is likely to be shifted due to loosening of the screw or the like, and thus lacks certainty. Further, the positioning of the tilting position in the left-right direction depends on the contact between the end of the long hole and the screw shaft, which is not accurate and has the drawback that the tilting position cannot be finely adjusted.

Therefore, the present applicant has filed Japanese Patent Application No. 4-1560.
No. 10 proposes a configuration in which the support arm is held in position with respect to the base by contact between a switching stopper rotatably provided on the support arm side in the vertical position and the left and right first stopper bolts on the base side. Has been done.

[0005]

However, in such a structure, the switching stopper corresponds to the case where the support arm is returned from the left tilt position to the vertical position and the case where the support arm is returned from the right tilt position to the vertical position. The switching stopper must be rotated and switched to the abutting position with respect to the left or right side first stopper bolt, and both the left and right first stopper bolts correspond to vertical positions. Since the screwing position must be adjusted, further improvement has been desired.

[0006]

In order to solve the above problems, a tabletop circular saw machine according to the present invention is provided with a base on which a workpiece is placed and a circular saw machine which is rotationally driven by a drive motor. A supporting unit for mounting the circular saw machine body to the base so as to be tiltable in the left-right direction of the circular saw, and supporting the circular saw machine body so that the circular saw machine body can be tilted left and right with respect to the base. A table-top circular saw machine comprising a stopper device for vertically positioning the circular saw machine body, wherein the stopper device includes an adjustable stopper member provided on the base side, and the circular saw machine. A stopper shaft is provided on the main body side so as to be slidable in a direction orthogonal to the tilting direction of the circular saw machine body, and a stopper shaft capable of contacting and avoiding contact with the stopper member, the stopper shaft being a stopper. When the circular saw machine body is in contact with the member, In and contact avoidance state without the positioning position, characterized by being configured to permit tilting of the round Nokoban body.

According to the present invention, the vertical positioning of the circular saw body is performed by projecting the stopper shaft in a direction orthogonal to the tilting direction of the circular saw body and abutting the stopper member. Also, the stopper shaft is retracted in a direction orthogonal to the tilting direction of the left and right direction of the circular saw machine body to avoid contact with the stopper member, thereby tilting the circular saw machine body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 3 show a tabletop circular saw 1 shown in a side view, a plan view, and a front view, respectively.
Is composed of a base 2 for placing and fixing a workpiece, and a main body 4 supporting a circular saw C, which is attached to the base 2 via a support arm 3 so as to be vertically tiltable and horizontally tiltable. Has become. The main body 4 includes a motor M for driving the circular saw C.
Are integrally provided with the motor housing 5 for housing the motor housing 5. Here, the motor M is arranged obliquely with respect to the circular saw C. With this arrangement, the motor housing 5 moves the main body 4 when the circular saw C is positioned perpendicular to the base 2. Projecting obliquely upward on the side of. The detailed structure of the main body 4 will be described later.

A turntable 6 is supported at the center of the base 2 so as to be horizontally rotatable within a predetermined range. A blade plate 7 is attached to the upper surface of the turntable 6 so as to protrude radially outward from a substantially central portion of the turntable 6, and a support protrusion 8 supporting the protruding portion of the blade plate 7 is attached to the turntable 6. Are formed correspondingly in the radial direction. Blade plate 7
Prior to the formation of a cutting edge, which will be described later, a plurality of lines 9 to 9 are formed in the longitudinal direction thereof at an appropriate interval in the longitudinal direction thereof in parallel with each other, as shown in FIG.

The support protrusion 8 is provided below the support protrusion 8.
Operating rod 1 for turning the turntable 6, the grip having a grip 10 protruding further outward from one end thereof.
1 is rotatably mounted. This operating rod 1
Reference numeral 1 denotes a screw means (not shown) provided between the support projection 8 and the other end thereof, which can be moved toward and away from a part of the outer wall of the base 2 with rotation by rotation. By the movement, the position of the turntable 6 can be fixed at an arbitrary rotation position with respect to the base 2.

The base 2 is a base 12 adjacent to the outer periphery of the turntable 6 at a location facing the diametrical direction of the turntable 6 in a direction substantially perpendicular to the longitudinal direction of the blade plate 7 in FIG. , 13 are integrally provided. The upper surfaces of the pedestals 12 and 13 are substantially flush with the upper surface of the turntable 6 and form a surface on which a workpiece is placed. A fence 14 for abutting the side surface of the workpiece is mounted on the bases 12 and 13 so as to straddle the turntable 6.

Further, as shown in FIG.
Among them, at the end of the base portion 12 on the side corresponding to the projecting side of the motor housing 5 with respect to the main body portion 4, a position-adjustable holder 15 for mounting a workpiece is additionally provided. In addition, a vertical vice device 16 for holding a workpiece placed on the holder 15 from above is provided, and the configuration thereof will be described below with reference to FIGS. 2, 3, and 5. .

A substantially U-shaped guide metal fitting 17 is removably attached to the end of the base 12 via a thumbscrew 18. The guide metal fitting 17 extends in a substantially radial direction of the turntable 6 and is in parallel. It has linear portions 17a, 17a. The holder 15 has a pair of corresponding insertion holes 1 through which the linear portions 17a of the guide member 17 are inserted.
5a and 15a, and are slidable along the linear portions 17a and 17a. Further, a thumb screw 19 for fixing the position of the holder 15 to the linear portions 17a, 17a is attached to the front end of the holder 15.
Further, a pair of support legs 21 each having a screw shaft portion 20 screwed to the bottom portion 15b and having an adjustable height are attached to the bottom portion 15b of the holder 15.

A vertical column 22 of the vertical vise device 16 is installed at a portion near the rear end of the holder 15 so that the lower portion of the vertical column 22 is inserted into a corresponding bottomed insertion hole 23 formed in the holder 15. And is removable with respect to the holder 15 by means of a thumbscrew 24. A horizontal support 25 is detachably attached to the upper end of the vertical support 22 by means of a thumb screw 26. The horizontal support 25 projects toward the center of the holder 15 and projects forward. It is screwed in a penetrating state in the direction. The tightening screw 27 has a knob 28 at the upper end thereof for turning operation by an operator, and a work holder 29 at the lower end for contact with the upper surface of the work W shown by an imaginary line in the figure. The workpiece W can be pressed and held on the upper surface of the holder 15 via the workpiece holder 29 by tightening the tightening screw 27.

As shown in FIG. 2, such a vertical vise device 16 has insertion holes 30 to 30 corresponding to the insertion holes 23 of the holder 15 provided on both sides of the main body portion 4 of the fence 14. A vertical column 22 can be attached to the above to similarly hold the work piece under pressure.

Next, referring to FIGS. 1 and 6, the support arm 3 for supporting the main body portion 4 with respect to the base 2 is the rear end portion of the turntable 6, that is, the blade plate. 7, a bracket 31 formed integrally with the turntable 6 at the end opposite to the side where the support protrusion 8 is provided.
Attached through. Here, the bracket 31
Has a substantially hollow cylindrical support cylinder 32 with an open rear end, and a support shaft 33 is fixed to the center of the support cylinder 32 so as to be non-rotatable by a pin 34 so as to protrude rearward. On the other hand, at the lower part of the support arm 3, a substantially hollow cylindrical rotating cylinder 35 having an open front end corresponding to the support cylinder 32 of the bracket 31 is integrally formed. The rotating cylinder 35 is rotatably fitted at an end facing the supporting cylinder 32, and its rotation center axis is located at substantially the same height as the upper surface of the base 2 and has a blade. It extends substantially parallel to the longitudinal direction of the mouth plate 7. The support shaft 33 is provided with the rotating cylinder 3
5 extends through the sleeve 36 integrally formed in the inside of the casing 5 and protrudes rearward from the rotary cylinder 35, and a threaded portion 33a is formed on the outer periphery of the protruding end. A nut 37 is screwed into the screw portion 33a, and a flat washer 38 and a spring washer 39 are interposed between the nut 37 and the rear surface of the rotating cylindrical portion 35. Also, a shaft portion 42 of a handle 41 is fixed to the nut 37 via a screw 40, and the handle 41 is rotated to advance the nut 37,
By pressing the spring washer 39 against the rear surface of the rotating cylinder 35, the rotating cylinder 35 can be fixed in position with respect to the support cylinder 32.

Further, between the support tubular portion 32 and the rotary tubular portion 35, the rotational position of the rotary tubular portion 35 with respect to the support tubular portion 32 is restricted, that is, the support arm 3 and the main body portion 4 are provided.
A positioning mechanism that regulates the neutral position and the left and right tilt positions is provided.
This will be described with reference to FIGS.

In FIG. 7, which is a sectional view taken along the line VII-VII of FIG. 6, a first stopper bolt 42 positioned substantially directly above the support shaft 33 and a first stopper bolt 42 are provided around the support cylindrical portion 32. The bolts 42 are arranged at an angle of about 45 ° in the left-right direction, and in the upright state, the support shaft 33 is provided.
The second stopper bolt 43 and the third stopper bolt 44, which are located at substantially the same height as
It is screwed outside with the shaft end positioned inside the support cylinder 32.

On the other hand, as shown in FIG. 7, the rotating cylinder portion 35 has a stopper pin 45 which can come into contact with the shaft end of the first stopper bolt 42 when the support arm 3 is substantially upright with respect to the base 2. There is provided a stopper mechanism 46 including. As shown in FIG. 8, which is a cross-sectional view taken along the line VIII-VIII of FIG. 6, the stopper mechanism 46 is mounted in a recess 47 formed on the outer wall of the rotary cylinder 35 and can be pushed by a user. An operation photographing 48 is provided. The operation photographing 48 has a shaft portion 49 having one end fixed to the operation photographing 48 and the other end penetrating through the wall portion of the rotating cylinder portion 35 and protruding into the inside thereof. Have. The other end of the shaft portion 49 is enlarged in diameter by a slit 49a, and has a flange portion 49b on the outer periphery of the distal end so that the shaft portion 49 is prevented from coming off from the rotating cylindrical portion 35.

Further, as shown in FIG. 8, a lever 50 having the above-mentioned stopper pin 45 fixed to the end thereof is arranged inside the rotary cylinder 35 close to the shaft 49 of the operation photographing device 48. This lever 50 is, as shown in FIG.
It is rotatably attached to a support shaft 51 that is inserted and fixed in a mounting hole formed in. A torsion coil spring 52 is inserted through the support shaft 51. One end of the torsion coil spring 52 is formed on the inner wall of the rotating cylinder portion 35 forming the receiving portion of the operation photograph 48, and the other end is formed on the lever 50. The locking groove 53 is locked to the end of the bottom surface 53a of the locking groove 53, which is substantially perpendicular to the radial direction about the support shaft 51, in the clockwise direction in FIG. As shown in FIG. 7, the stopper pin 45 normally abuts on the abutment surface 32a of the inner wall of the support tubular portion 32 that is adjacent to the mounting portion of the first stopper bolt 42 on the counterclockwise side. It is kept in a state of facing the end portion of the first stopper bolt 42.

Further, the mounting portion of the first stopper bolt 42, which is continuous with the contact surface 32a of the support cylindrical portion 32, is formed in an inward step shape, and the mounting portion of the first stopper bolt 42 and the second stopper bolt 42 are formed. The contact surface 32 between the mounting portion 43 and
The guide surface 32b of the stopper pin 45 located radially inward from the position a is formed, and the operation of the guide surface 32b will be described later.

Here, as described above, in the tabletop circular saw machine 1 of this embodiment, the motor housing 5 for accommodating the motor M projects obliquely with respect to the main body portion 4. The weight of is when the support arm 3 is upright,
A moment is generated to tilt the support arm 3 in the clockwise direction (the direction of arrow A) in FIG. That is, in the state shown in FIG. 7, the stopper pin 45 of the lever 50 is moved to the first position by the clockwise moment applied to the support arm 3.
The shaft comes into contact with the end of the stopper bolt 42, whereby the support arm 3 is positioned in an upright state.

Further, the lever 50 is provided with an operation photograph 48.
A contact surface 54 of the end of the shaft portion 49 is formed on the side facing the end of the shaft portion 49 of the
When pushed in, the end of the shaft portion 49 comes into contact with the contact surface 54, and the lever 50 rotates clockwise as shown by the imaginary line in FIG. 7 against the urging force of the torsion coil spring 52. Then, the contact of the first stopper bolt with the shaft end is released, and the support arm 3 can be tilted clockwise in FIG. 7 from the upright state.

On the other hand, as shown in FIG. 6, a stopper piece 55 is integrally formed in the lower part of the rotary cylinder portion 35 so as to project axially toward the support cylinder portion 32. This stopper piece 5
5 are side faces 55a, 55 on the left and right sides as shown in FIG.
b is located on substantially the same circumference as the ends of the shafts of the second stopper bolt 43 and the third stopper bolt 44, and the clockwise direction (arrow A in FIG.
Direction), the one side 55a as shown in FIG.
Abuts against the end of the shaft of the second stopper bolt 43, and when the support arm 3 is tilted counterclockwise in the drawing (the direction of arrow B), the other side surface 55b is connected to the shaft of the third stopper bolt 44 as shown in FIG. The right and left tilt limits of the support arm 3 can be restricted by contacting the end of the support arm.

Further, the support shaft 33 of the rotating cylinder portion 35 has
As shown in FIG. 6, a cylindrical spacer 57 interposed between a sleeve 36 formed integrally with the rotating cylinder 35 and a sleeve 56 formed integrally with the support cylinder 32 and through which the support shaft 33 is inserted. Around the torsion coil spring 58
Is inserted. As shown in FIG. 7, the torsion coil spring 58 has its ends 58a and 58b bent in a J-shape in opposite directions to each other, and is attached across the stopper piece 55 while intersecting each other.
Near the inner wall. Here, the support cylinder 32
A locking projection 59 having substantially the same width as the stopper piece 55 is provided on the inner wall at a position slightly closer to the third stopper bolt 44 than an intermediate position between the second stopper bolt 43 and the third stopper bolt 44. It is formed integrally. FIG.
Of the torsion coil spring 5
8, a clockwise end 58a is abutted and locked on one side face 55a of the stopper piece 55, and the other end 58b is abutted and locked on a counterclockwise side face of the locking projection 59. 7 is biased in the direction B in FIG. That is, the biasing force of the torsion coil spring 58 acts in a direction to cancel the moment in the direction A in the figure generated by the motor M and the motor housing 5, and the support arm 3 can be stably held upright. However, the biasing force of the torsion coil spring 58 is slightly smaller than the moment generated by the motor M and the motor housing 5 when the support arm 3 is in the upright state. It is set so as to be slightly smaller than the applied moment.

Incidentally, such a torsion coil spring 58 is shown by an angle corresponding to the displacement angle between the stopper piece 55 and the locking projection 59 from the state in which the rotary cylinder portion 35 is shown in FIG. When rotated in the middle B direction, the ends 58a, 58b
Are brought into contact with the corresponding side surfaces 55a and 55b of the stopper piece 55, and the urging force is not applied. Thus, the rotating position of the rotating cylindrical portion 35 moves the supporting arm 3 and the motor housing 5 further. The center of gravity of the main body 4 includes a neutral position located on the axis of the support shaft 33.

When the support arm 3 is tilted to the right from the state shown in FIG. 7, that is, when the rotary cylinder portion 35 is rotated in the direction of arrow A, the distance between the end portions 58a and 58b becomes as shown in FIG. As the tilt angle gradually increases, the biasing force for returning the torsion coil spring 58 to the neutral position increases, and the tilting operation of the support arm 3 downward and the returning operation upward can be performed easily and smoothly. You can

Further, from the state shown in FIG.
Is tilted to the left, that is, when the rotary cylinder 35 is rotated in the direction of arrow B, the movement to the neutral position can be performed smoothly with the assistance of the biasing force of the torsion coil spring 58 in the same direction. When it is further rotated in the same direction beyond the neutral position, as shown in FIG.
Reference numeral 8 denotes a state in which the clockwise end 58a is locked by the locking projection 59, and the counterclockwise end 58b is locked by the corresponding side surface 55b of the stopper piece 55, and gradually contacts the end 58a. As the interval is increased and the tilt angle of the support arm 3 is increased as in the case of the rotation in the direction A, a larger biasing force for returning the support arm 3 to the neutral position is applied, and the tilt operation is performed easily and smoothly. Can be.

Returning to FIG. 1, a slide bar 60 for supporting the main body 4 in the front-rear direction is attached to the upper portion of the support arm 3, and a structure for holding the slide bar 60 will be described with reference to FIG. A hollow cylindrical slide bar support cylinder portion 61 is integrally formed on the upper part of the support arm 3, and a bearing cylinder body 62 through which the slide bar 60 is inserted is fitted inside the slide bar support cylinder portion 61. It is fixed. A plurality of bearing balls 6 are provided on the outer periphery of the slide bar 60.
A pair of guide grooves 64, 64 for accommodating 3 to 63 between corresponding guide grooves (not shown) formed in the bearing cylinder body 62 are provided in a pair (only one is shown in the drawing) at positions where they are diametrically opposed.
Are provided to form an angular ball spline. A fixing bolt 66 for positioning the slide bar 60 is screwed into the upper portion of the bearing cylinder 62 through a cover 72 described later.

A cap 67 (see FIGS. 1 and 2) is fitted to the rear end of the slide bar 60, and the base end 68 of the main body 4 can be tilted up and down via a support shaft 69 at the front end. A bracket 71 integrally having a bifurcated connecting portion 70 (see FIG. 1) connected to is fixedly fitted. A cover 72 is attached to the outer periphery of the bearing cylinder 62, and is provided between the cap 67 of the slide bar 60 and the rear end of the cover 72 and between the front end of the cover 72 and the bracket 71. Are covered with bellows 73 and 74, respectively, and the bellows 74 is further covered with an auxiliary cover 74a.

A compression coil spring is provided between the base end portion 68 of the main body portion 4 and the bracket 71 in the vicinity of the pivot point of the support shaft 69 to constantly urge the main body portion 4 in the upward tilting direction. A spring receiving portion 76 for supporting the end portion of 75,
77 are provided respectively. Here, a bolt 78 is screwed into the spring receiving portion 76 on the base end portion 68 along the tilting direction, while the end of the bolt 78 can abut on the spring receiving portion 77 on the bracket 71 side. A stopper portion 79 is provided, by which the limit of the downward tilt of the main body portion 4 is regulated by the contact of the stopper portion 79 and the limit of the tilt can be adjusted by adjusting the screwing degree of the bolt 78.

Here, the lower limit regulated by the bolt 78 and the stopper portion 79 is the same as in the normal cutting operation in which the blade portion of the circular saw C penetrates the blade plate 7 and projects into the base 2. Therefore, it is a critical one set in consideration of the positional relationship between the circular saw C and the blade plate 7 at the time of the lowest descent, but in the present embodiment, such a descent limit is set according to the type of machining. An adjusting mechanism that can arbitrarily regulate the descending position of the main body portion 4 is provided at an appropriate position above (hereinafter referred to as the critical descending limit). The structure of this mechanism will be described below.

As shown in FIG. 11, a groove 81 is formed on the right side surface (the rear surface of FIG. 6) of the base end portion 68 of the main body portion 4, and the center portion of the groove 81 is formed in the spring plate in a free state. 83 is fitted. Projections 80, 80 projecting from the base end 68 are formed on both sides in the longitudinal direction of the groove 81, and the projections 80, 8 are formed.
A pin 82 is attached between the zeros. An arm 85 having an adjustment bolt 84 screwed to the outer end thereof is rotatably connected to the pin 82. A connecting end of the arm 85 connected to the pin 82 is parallel to the longitudinal direction of the arm 85. A pair of flat portions 86, 86 (only one is shown in the figure) for contacting the spring plate 83 is formed at a position diametrically opposed to the pin 82. With this configuration, the arm 85 moves the spring plate 83 at each of the first position where the adjustment bolt 84 is located on the support shaft 69 side and the second position where the adjustment bolt 84 is located farther from the support shaft 69. The position can be held by pressing against the corresponding flat portion 86. on the other hand,
On the corresponding side of the connecting portion 70 of the bracket 71, a locking projection 87 to which the end of the adjustment bolt 84 can abut when the arm 85 is located at the first position is integrally formed. .

With such a structure, the arm 85
The tilt limit of the main body portion 4 in the downward direction can be regulated at a position higher than the critical lower limit limit by being located at the position, and such a tilt limit can be arbitrarily adjusted by screwing in the adjusting bolt 84. Can be set. When the arm 85 is rotated to the second position, the adjustment bolt 8
4 retreats to the non-contact position with respect to the locking projection 87 on the bracket 71 side, and the main body 4 can be lowered to the critical lowering limit.

Referring back to FIGS. 1 to 3, the structure of the main body 4 will be further described. The main body 4 has a blade case 88 that covers and accommodates substantially the upper half of the circular saw C. The base end portion 68 described above is integrally provided in the lower portion. A safety cover 89 for covering substantially the lower half of the circular saw C is attached to the blade case 88 so as to be rotatable coaxially with the center of rotation of the circular saw C. The circular saw C is linked to a lever 90 pivotally supported by the bracket 71 and is rotatable in a direction in which the circular saw C is exposed as the main body 4 tilts downward.

As shown in FIG. 3, a gear housing 91 is integrally formed on the right side of the blade case 88. A spindle 92 having a circular saw C mounted thereon is supported in the gear housing 91, and a bevel gear 93 as a reduction gear is mounted on the spindle 92.
The motor housing 5 is formed integrally on the right side of the gear housing 91 obliquely upward, and a motor M is provided in the motor housing 5 with its output shaft 94 obliquely upward at an angle of about 45 ° with respect to the circular saw C. Are arranged in
A pinion that meshes with the bevel gear 93 is formed at an end of the output shaft 94. As shown in FIG. 2, a handle 96 for vertically moving the main body 4 is integrally formed on the upper portion of the motor housing 5 so as to protrude forward.

The operation of the above embodiment will be described below. As described above, the tabletop circular saw machine 1 of this embodiment follows the movement of the main body 4 when the main body 4 is moved down via the handle 96. As a result, the circular saw C is exposed from the blade case 88, and thus the work piece placed on the base 2 can be cut. There are two operations: a vertical cutting operation in a state where the circular saw C is inclined with respect to the base 2 by tilting the main body 4 together with the support arm 3 to the right or left with respect to the base 2. It can be performed, first of all, a normal vertical cutting operation will be described below.

In the vertical cutting operation, the rotary cylinder portion 35 of the support arm 3 is attached to the turntable 6 by the bracket 31.
7 and the stopper pin 45 of the lever 50 of the stopper mechanism 46 is in the first position.
It is positioned in contact with the shaft end of the stopper bolt 42,
In this state, the rotation cylinder 35 and the support cylinder 32 are fixed to each other by tightening the nut 37 via the handle 41. In this state, the support arm 3 is in the upright state, and the position can be accurately determined by adjusting the screwing amount of the first stopper bolt 42.

In this state, a material to be processed (assumed to be a long material) is placed across the bases 12 and 13 of the base 2, and a fence 14 is used to position the side of the material to be processed. The vice device 16 is arbitrarily attached using the insertion holes 30 to 30 of the fence 14, and the tightening screw 27 is tightened to fix and hold the workpiece from the upper side.

Next, the operator pushes the handle 96 of the main body 4 against the urging force of the compression coil spring 75 from the upper side, and tilts the main body 4 downward around the support shaft 69 with respect to the support arm 3. Then, the safety cover 89 rotates to rotate the circular saw C.
Is gradually exposed, and when it reaches the workpiece, the workpiece is completely exposed and cut, and the bolt 78 on the base end 68 side is cut.
When the critical lower limit is reached due to the contact of the stopper portion 79 between the end of the circular saw and the bracket 71, the lower portion of the circular saw C penetrates the blade plate 7 as shown in FIG. It is in a state of protruding downward.

Here, depending on the type of cutting work, when it is desired to regulate the lowering limit of the main body 4 above the critical lowering limit, that is, the lowering of the circular saw C is stopped above the cutting edge plate 7. If desired, the arm 85 of the adjusting mechanism arranged on the right side surface of the base end portion 68 of the main body portion 4 is positioned at the first position shown by the solid line in FIG. Then, the adjusting bolt 84 comes into contact with the locking projection 87 of the bracket 71 before the main body 4 reaches the critical lowering limit, so that further lowering is prevented. In addition. Such a contact height can be changed by adjusting the screwing position of the adjusting bolt 84 into the arm 85. When the main body 4 is to be lowered to the critical lowering limit again, the arm 85 is opposed to the spring plate 83. By rotating the spring plate 83 to the second position indicated by the imaginary line in FIG.
Thus, the adjustment bolt 84 can be held again in the second position, and the adjustment bolt 84 can be retracted and held in a non-contact state with the locking projection 87.

Further, in the tabletop circular saw machine 1 of this embodiment,
The main body 4 is attached to a slide bar 60 supported on the upper part of the support arm 3, and the slide bar 60 is slidable in the front-rear direction along a support cylinder 61 on the upper part of the support arm 3. Accordingly, when the fixing bolt 66 is loosened to release the fixed state of the slide bar 60 with respect to the support arm 3, and the main body 4 is pulled forward with the handle 96 of the main body 4, the main body 4 is moved toward the support cylinder 61 of the slide bar 60. It moves forward with sliding, whereby, for example, when the width of the workpiece is wide, a cutting operation over the entire width can be performed with forward movement of the circular saw C.

Next, an angle cutting operation in which the circular saw C is in an oblique state with respect to the base 2 will be described. First, the handle 37 is turned in the reverse direction from the previous vertical cutting operation state, the nut 37 is loosened, and the fixed state of the rotating cylinder 35 and the support cylinder 32 is released. Next, when the operation mechanism 48 of the stopper mechanism 46 is pushed into the recess 47, the stopper pin 45 moves radially inward with respect to the support cylinder 32 as shown by the imaginary line in FIG. The contact state of the bolt 42 with the shaft end is released. Here, as described above, in the state of FIG. 7, the support arm 3 is provided with the motor housing 5 for housing the motor M on the right side of the main body 4 so that the clockwise direction (A) Direction) is acting,
Since this moment is greater than the biasing force of the torsion coil spring 58 in the reverse direction (B direction), the support arm 3 naturally tilts in the A direction as the stopper pin 45 is released. Next, when the pushing of the stopper pin 45 is released, the stopper pin 45 is
However, at this time, it has already reached the guide surface 32b on the clockwise side beyond the step on the inner periphery of the mounting portion of the first stopper bolt 42 of the support cylinder portion 32. Therefore, the support arm 3 can be further tilted without being hindered by the stopper pin 45.

The tilting operation of the support arm 3 is performed by the operator holding the handle 96 of the main body portion 4. The tilting operation is opposite to the tilting direction of the torsion coil spring 58 as described above and is accompanied by the tilting. With the help of a gradually increasing biasing force, it is possible to operate with a slight bearing force.

The tilting of the support arm 3 is as shown in FIG.
The stopper piece 55 of the rotating cylinder 35 is the second stopper bolt 4
When the rotary cylinder 35 and the support cylinder 32 are fixed to each other by rotating the handle 41 in this state, the nut 37 is tightened, and the rotary cylinder 35 and the support cylinder 32 are fixed. Thereby, the support arm 3 is held in the inclined state. Note that such an inclination angle can be accurately and arbitrarily set by adjusting the screwing amount of the second stopper bolt 43.

As described above, the operator presses the handle 96 of the main body 4 from the upper side against the urging force of the compression coil spring 75 while the support arm 3 is held inclined to the right side, whereby the material to be processed is pressed. In the critical descending limit regulated by the contact of the stopper portion 79 between the end portion of the bolt 78 on the base end portion 68 side and the bracket 71, as shown in FIG. The lower part of the circular saw C projects below the blade plate 7 by a distance substantially similar to that in the case of the above vertical cutting.

As described above, when the support arm 3 is inclined to the right side, the motor housing 5 projects to the right side of the main body portion 4 as described above, and the motor housing 5 interferes and is positioned on the same side. Insertion hole 30 of fence 14
In some cases, it is difficult to hold the workpiece by the vertical vice device 16 using the 〜30. However, in the present embodiment, a holder 15 whose position can be adjusted along the guide fitting 17 is provided at the end of the base 12 on the corresponding side of the base 2, and the vertical vise device 16 is attached to this holder 15. As shown in FIGS. 3 and 5, the workpiece W can be pressed and held against the holder 15 from above by the tightening screw 27. Here, the position of the holder 15 can be adjusted with respect to the guide fitting 17 according to the length of the workpiece W to be held and the like, and the guide fitting 17 is detachable with the thumb screw 18. It has a structure that can be removed and has excellent operability.

Next, the angle cutting operation performed by tilting the support arm 3 from the upright state to the left, contrary to the above, will be described. First, similarly to the above, the fixed state of the rotating cylinder 35 and the support cylinder 32 is released by turning the handle 41 of the rotating cylinder 35. Next, the stopper mechanism 46 is left as it is,
Is pushed to the left via the handle 96, that is, the support arm 3 is tilted counterclockwise (direction B) in FIG. here,
As described above, in the upright state of FIG. 7, a moment in the clockwise direction (A direction) of the main body 4 in the figure is applied to the support arm 3, but such a moment is applied to the coil spring 58. Since the biasing force in the opposite direction largely cancels out, the tilting can be performed with a small force, and the center of gravity of the main body 4 including the support arm 3 and the motor housing 5 is immediately connected to the support cylinder. Reaching a neutral position vertically above the axis of the support shaft 33 of the part 32,
When the neutral position is exceeded, the moment of the support arm 3 and the main body 4 acts in the counterclockwise direction (B direction), that is, in the tilting direction, and is tilted in the opposite direction by the torsion coil spring 58. With this, a gradually increasing urging force is applied. With the assistance of the biasing force provided by the torsion coil spring 58, the supporting force of the main body 4 by the handle 96 is small as in the case of the above-described rightward tilting operation. During such tilting, the stopper pin 45 of the stopper mechanism 46 is brought into contact with the contact surface 32 of the support cylinder 32.
slides along a.

As shown in FIG. 10, the tilting of the support arm 3 is stopped at a tilted position of about 45 ° by the stopper piece 55 of the rotary cylinder 35 coming into contact with the third stopper bolt 44. 41 is turned to tighten the nut 37 to fix the rotating cylinder portion 35 and the support cylinder portion 32 in position. As a result, the support arm 3 is held in an inclined state to the left, and the operator presses the handle 96 of the main body 4 from above against the urging force of the compression coil spring 75, whereby the angle of the workpiece is adjusted. Cutting can be performed. The inclination angle in this case can be set accurately and arbitrarily by adjusting the screwing amount of the third stopper bolt 44 similarly to the case of the above-mentioned right inclination. In the critical lowering limit, as shown in FIG. The lower portion of the saw C protrudes below the blade plate 7 by a distance substantially the same as in the case of the vertical cutting.

In the tabletop circular saw machine 1 of the present embodiment, the corner line aligning lines 9 to 9 are drawn in advance on the upper surface of the blade plate 7 as described with reference to FIG. In such a tabletop circular sawing machine 1, the circular saw C is cut into the blade edge plate 7 by the vertical cutting with the support arm 3 standing upright with respect to the base 2, and the blade edge 7a is formed on the spot. However, since the angle cutting performed by tilting the support arm 3 to the right and left with respect to the base 2 is performed, the blade opening 7a becomes wider, and the corner line of the workpiece is set with respect to the blade opening 7a. As a result, it is impossible to accurately match the cutting position by the circular saw C.
However, in the present embodiment, the line 9-9 for corner line alignment is drawn on the blade edge plate 7 in advance, and these lines 9-9 are drawn.
If the positional relationship between the circular saw 9 and the circular saw C is calculated when, for example, the cutting edge 7a is first formed, the corner line of the workpiece is accurately positioned at the cutting position by the circular saw C with reference to the lines 9 to 9. Can be matched.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In the second embodiment, the support arm 3 is used.
The structure is the same as that of the first embodiment except for the positioning mechanism between the rotating cylindrical portion 35 and the support cylindrical portion 32 of the bracket 31 of the turntable 6, so that the illustration and description of the structure of other parts are omitted, 12 to 16, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 12, the support shaft 33 has a sleeve 36a for the rotating cylinder portion 35 and a sleeve 56a for the support cylinder portion 32.
13, a substantially fan-shaped lever 97 is rotatably pivoted. As shown in FIG. 13, the end of the lever 97 on the arrow B direction side (counterclockwise side) has a support cylinder portion 32. Locking projection 9 integrally formed on the inner wall of the housing and projecting substantially vertically downward.
8 is integrally formed in such a manner as to protrude outward in the radial direction, and a hook 101 at one end of the extension coil spring 100 is provided in a circumferentially outer portion adjacent to the lock 99. And are integrally formed in a bent state. On the other hand, a hook shaft 102 for hooking the other end of the extension coil spring 100 is formed integrally with the rotation tube portion 35 so as to protrude toward the support tube portion 32. In the upright state, as shown in FIG. 12, the lever 97 is located at substantially the same height in a state facing the hooking portion 101 of the lever 97. In this state, the tension coil spring 10
0 denotes the support cylinder 32 in the direction of arrow B in FIGS. 13 and 14;
That is, the support arm 3 is biased in a direction against the moment acting in the direction A in FIG. In a neutral state in which the center of gravity of the support arm 4 and the center of gravity of the support arm 3 are located on the support shaft 33, the urging force is not applied.

A left side stopper bolt 103 and a right side stopper bolt 104 respectively corresponding to the second stopper bolt 43 and the second stopper bolt 44 of the first embodiment are screwed into the support cylinder portion 32, and the left side stopper bolt 1
Numeral 03 is disposed on the side of the rotating cylinder 35 with respect to the right stopper bolt 104 in the axial direction, as shown in FIG. Further, a stopper piece 105 corresponding to the stopper piece 55 of the first embodiment is integrally formed in the lower part of the inside of the rotating cylinder part 35 so as to protrude into the support cylinder part 32. At the time of tilting, positioning is performed by contacting the shaft ends of the left stopper bolt 103 and the right stopper bolt 104.

In this embodiment, a stopper mechanism 106 utilizing the left stopper bolt 103 is provided as a mechanism for holding the support arm 3 in the upright position. This mechanism will be described below.

As shown in FIG. 12, a stopper shaft 107 having a rectangular cross section is provided in the inner lower portion of the rotating cylinder portion 35 at a portion adjacent to the stopper piece 105 in the clockwise direction, of the support arm 3 (main body portion 4). A guide tube portion 108 that slidably supports in a direction orthogonal to the left and right tilting directions is formed to project in the axial direction. An operation shaft 109 is screwed to a rear portion of the stopper shaft 107, and a spherical operation photograph 110 is attached to the operation shaft 109 outside the rotary cylinder 35. A spring 111 for urging the stopper shaft 107 forward together with the operation shaft 109 is mounted around the operation shaft 109 inside the guide tube portion 108. The stopper shaft 107 is operated by the spring 111 so that the operation
Is normally maintained at a protruding position locked by the outer surface of the rotating cylindrical portion 35. In this protruding position, the front end 107a of the stopper shaft 107 abuts on the shaft end of the left stopper bolt 103 as shown in FIG. It is possible. Further, the front end portion 107a of the stopper shaft 107 has a bulge shape,
As shown by the phantom line in FIG. 12, when the operation photograph 110 is pulled backward against the biasing force of the spring 111, the front end portion 1
07a is brought into contact with and locked to the front end surface of the guide tube portion 108, and the stopper shaft 107 is left at this position.
3 Furthermore, it is set so as not to interfere with the mounting portion 112 of the stopper bolt. The mounting portion 112 has a substantially circumferential projection 112a integrally formed on the clockwise side, and the operation of the projection 112 will be described later.

The operation of the second embodiment will be described. First, when the support arm 3 is in the upright state, the engaging portion 99 of the lever 97 is engaged with the engaging protrusion 98 of the supporting tubular portion 32, and the tension coil As described above, the spring 100 urges the support cylindrical portion 32 in the direction of the arrow B, that is, in the direction against the moment in the direction A in the figure which is exerted by the main body portion 4. In this state, the front end 107a of the stopper shaft 107 abuts against the shaft end of the left stopper bolt 103 as shown in FIG. 14, and the moment in the direction A in the figure of the main body 4 overcomes the urging force of the tension coil spring 100. The positioning of the rotating cylinder 35 is performed against this. In this state, if the handle 41 of the rotating cylinder 35 is turned to fix the position of the rotating cylinder 35 and the supporting cylinder 32, the same vertical cutting operation of the workpiece as in the first embodiment can be performed. it can.

Next, when the support arm 3 is angled to the right (A direction), the fixed state by the handle 41 is released, and the operation photograph 110 of the stopper shaft 107 of the stopper mechanism 106 is moved backward. When pulled to the left side, the front end portion 107a of the stopper shaft 107 is moved to the left side stopper bolt 103
Is retracted from the contact position with respect to the shaft end. Then, the support arm 3 is moved by the moment in the direction A of the main body 4.
Tilts naturally to the right. With such a tilt, the hook 101 of the lever 97 and the hook 102 of the rotary cylinder 35
With this, the tension coil spring 100 gradually exerts a large urging force in the direction opposite to the tilting direction. Therefore, as in the first embodiment, the supporting force of the main body 4 via the handle 96 can be reduced. With such a tilt, the stopper shaft 107 of the stopper mechanism 106 is attached to the mounting portion 1 of the stopper bolt 103 on the left side.
Even if you release the operation shot 110
Since the mounting portion 112 comes into contact with the rear surface and tilts and slides with respect thereto, the tilting of the support arm 3 can be performed without any trouble.

Such tilting of the support arm 3 is stopped by the side surface of the stopper piece 105 coming into contact with the shaft end of the left stopper bolt 103, as shown in FIG. By turning 41 to fix the rotary cylinder portion 35 and the support cylinder portion 32 in position, it is possible to perform angle cutting with the support arm 3 tilted to the right. In such a tilted state, as shown in FIG. 15, the stopper shaft 107 of the stopper mechanism 106 moves clockwise slightly beyond the mounting portion 112 of the left stopper bolt 103, but moves in the same direction. Is provided with a protrusion 112a, so that the contact state of the stopper shaft 107 can be maintained.

On the other hand, when the support arm 3 is angled to the left (direction B) from the upright state, the fixed state by the handle 41 is released, and the tension coil spring 100 acting in the upright state is released. With the assistance of the biasing force, the body portion 4 is tilted to the left against the moment. When the support arm 3 exceeds the above-described neutral position, the urging force of the tension coil spring 100 stops working, and thereafter the support arm 3 is tilted under the support force via the handle 96 of the main body 4. Here, the stopper shaft 107 of the stopper mechanism 106 moves in the lower space between the left stopper bolt 103 and the right stopper bolt 104 in the support cylinder portion 32 through such tilting, and the movement of the stopper shaft 107 moves into this space. Since there is no obstacle that obstructs the operation, the stopper mechanism 106 can be tilted and operated without pulling the operation shooting 110.

Such tilting of the support arm 3 is stopped when the side surface of the stopper piece 105 contacts the end of the shaft portion of the right stopper bolt 104, as shown in FIG. By rotating 41 to positionally fix the rotating cylinder portion 35 and the supporting cylinder portion 32, it is possible to perform angle cutting in a state in which the supporting arm 3 is tilted to the left.

The contact state of each of the stopper pin 45 and the stopper piece 55 with respect to the first stopper bolt 42, the second stopper bolt 43, and the third stopper bolt 44 in the above-described first embodiment, and the above-mentioned second The stopper piece 55 and the stopper shaft 1 for the left stopper bolt 103 and the right stopper bolt 104 in the embodiment
07, the respective contact states of the screw shaft ends of the first stopper bolt 42, the second stopper bolt 43, the third stopper bolt 44, the left stopper bolt 103, and the right stopper bolt 104 in the support cylinder portion 32. The contact structure can ensure the contact state, and can be separated from the contact portions, that is, the first stopper bolt 42, the second stopper bolt 43, the third stopper bolt 44, and Since the heads of the left stopper bolt 103 and the right stopper bolt 104 are located outside the support cylinder 32, the screw adjustment is performed using the heads of the stopper bolts 42, 43, 44, 103, and 104. Can be performed very easily.

[0062]

According to the present invention, the stopper shaft provided so as to be slidable with respect to the circular saw machine body side in the direction orthogonal to the tilting direction of the circular saw machine body is brought into contact with the stopper member on the base side. By doing so, the vertical position of the circular saw machine main body can be positioned, and the circular saw machine main body can be tilted by retracting the stopper shaft in the sliding direction to avoid contact with the stopper member. You can This has an advantage that the vertical position of the circular saw body can be accurately positioned by simplifying the structure and improving the operability.

[Brief description of the drawings]

FIG. 1 is an overall side view of a desk circular saw according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially cutaway front view of FIG. 1;

FIG. 4 is a plan view of the base and the turntable of FIG. 1;

FIG. 5 is a sectional view of a holder and a vertical vise device attached to a base.

FIG. 6 is a longitudinal sectional view showing a support arm together with a connecting portion thereof.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a cross-sectional view similar to FIG. 7, showing a state where the support arm is inclined rightward.

FIG. 10 shows a state where the support arm is inclined to the left.
It is sectional drawing similar to.

FIG. 11 is an enlarged side view of a connecting portion between the support arm and the main body.

FIG. 12 is a longitudinal sectional view of a connection portion between a support arm and a base of a bench circular saw according to a second embodiment of the present invention.

13 is a sectional view taken along line XIII-XIII in FIG.

14 is a sectional view taken along line XIV-XIV of FIG.

FIG. 15 shows a state in which the support arm is inclined to the right.
FIG. 4 is a sectional view similar to FIG.

FIG. 16 shows a state where the support arm is inclined to the left.
FIG. 4 is a sectional view similar to FIG.

[Explanation of symbols]

 1 Desktop Circular Saw Machine 2 Base 3 Support Arm 4 Main Body 103 Left Stopper Bolt 106 Stopper Mechanism 107 Stopper Axis W Workpiece C Circular Saw M Motor

Claims (1)

(57) [Claims] 1. A base on which a workpiece is placed, and a circular saw machine body having a circular saw that is rotationally driven by a drive motor. The circular saw machine body is provided with a circular saw machine with respect to the base. A stopper device is provided for tilting in the left-right direction, and is provided with a stopper device for positioning a vertical position of the circular saw machine body at a support portion that supports the circular saw machine body with respect to the base so as to be horizontally tiltable. It is a tabletop circular saw, and the stopper device is
A stopper member adjustable provided before Symbol base side,
On the side of the circular saw machine body , orthogonal to the tilting direction of the circular saw machine body.
Is provided slidably in the direction
It is equipped with a stopper shaft that can make contact and avoid contact.
The stopper shaft of the circular saw machine is in contact with the stopper member.
When the body is positioned vertically and contact is avoided,
Tabletop circular saw machine characterized by being configured to allow tilting of the circular saw machine body .