JP2537141B2 - 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 table-top circular saw machine which pushes down a circular saw body against a material placed on a table to cut the material at a predetermined position.

[0002]

2. Description of the Related Art Conventionally, in this type of tabletop circular saw machine,
At the start of use of the circular saw machine, a blade of a circular saw was cut into a blade plate to form a blade, and the blade was used as a line for corner line alignment. According to this, if the material to be cut is positioned on the table in a state where the corner line is aligned with the blade mouth, the cutting edge will bite along the corner line of the material to be cut, thereby cutting the material to be cut. It could be cut at the desired position.

[0003]

As described above, conventionally, the blade opening formed by cutting the blade edge of the circular saw into the blade opening plate at the beginning of use has been used as a line for corner line alignment. There was no problem when doing so-called vertical cutting (right-angle cutting) in which the saw was cut at a right angle to the blade plate, but when doing so-called angle cutting (tilted cutting) in which the circular saw was cut diagonally. Since the width of the blade becomes thicker, the alignment accuracy is lowered as a line for aligning the corner lines thereafter, and thus this blade cannot be actually used as a line for aligning the corner line. For this reason, conventionally,
Inevitably, the circular saw was once pushed down with one hand, and in this state, the material to be cut was grasped with the other hand, and the corner line was directly aligned with the cutting edge to position the material to be cut. For this reason,
There is a problem that it is difficult to carry out positioning work such as being unable to grip the material to be cut with both hands, and it takes time. The present invention has been made in view of this problem, and provides a table-top circular saw machine that can always accurately and easily align the corner lines of a material to be cut even when angle cutting is performed. To aim.

[0004]

To this end, the invention according to claim 1 provides a base, a table rotatably supported by the base on which a material to be cut is placed, and a table straddling the table. A bench circular saw machine provided with a fence for positioning the material to be cut, and a circular saw machine body supported by the base so as to be vertically movable above the table. A line for corner line alignment for positioning the material to be cut with respect to the main body of the circular saw machine is provided in a range on the upper surface of the table that is behind the material contact surface of the fence. And

[0005]

According to the structure of the first aspect, since the line for aligning the corner lines is drawn on the table, even if the cutting edge becomes thicker due to the angle cutting, the line on the table can be used for the completion. Line alignment can be performed and therefore always accurate corner line alignment. In addition, since the corner line is drawn in a range behind the material contact surface of the fence, it does not disappear when the material to be cut is placed on the table. Therefore, regardless of the size of the material to be cut, accurate seam line alignment can always be performed. Here, the range behind the material-to-be-cut material contact surface of the fence is a range above the material-to-be-cut material contact surface of the fence in FIG. 5, that is, the upper surface of the table on which the material-to-be-cut is placed. The range on the side that is not covered.

[0006]

According to the first aspect of the present invention, it is possible to always perform accurate seam line alignment and perform accurate cutting work.

[0007]

EXAMPLES Next, examples of the present invention will be specifically described with reference to FIGS. FIG. 3 is a side view of the tabletop circular saw machine 1 (hereinafter, simply referred to as “circular saw machine”), and FIG. 4 is a plan view thereof.

As shown in the figure, the circular saw machine 1 is supported by a base 2 for mounting and fixing a material to be cut and a support arm 3 having a slide support S incorporated in the base 2. Can be slid along the surface of the base 2,
A circular saw machine body (hereinafter, simply referred to as “main body portion”) 4 having a circular saw C. Hereinafter, each configuration will be described.

A turntable 6 is supported on the upper surface of the base 2 so as to be horizontally rotatable within a range of about 45 ° left and right.
The turning angle of the turntable 6 can be accurately set by reading the scale 2a (see FIG. 5) displayed on the front surface of the base 2.

A blade plate 7 is mounted on the upper surface of the turntable 6 so as to project radially outward (to the right in the drawing) from a substantially central portion thereof. A supporting projection 8 having a substantially U-shaped cross section for supporting the projecting portion is correspondingly formed to project in the radial direction. Prior to the formation of the blade, a plurality of corner line aligning lines 9a to 9a are drawn in parallel to each other in the longitudinal direction on the upper surface of the blade plate 7 in parallel with each other at appropriate intervals.

An operation rod 11 for rotating the turntable 6 is rotatably attached to the tip of the support projection 8, and a grip 10 is further attached to the tip of the operation rod 11. The operating rod 11 can be moved to and from the other end of the outer wall of the base 2 by a screw means (not shown) provided between the operating rod 11 and the supporting projection 8, and the grip 10 is used. By turning itself, the turntable 6 can be fixed to the base 2 at an arbitrary turning position.

Further, as shown in FIG. 5, the turntable 6
A line 9b for aligning the corner lines is also drawn on the upper surface of the line, and this line 9b is drawn radially inward from the center of the turntable 6, that is, backward from the blade plate 7. In other words, the line 9b is drawn on the upper surface of the turntable 6 in a range rearward of the material-contacting surface 14b of the fence 14, that is, on the upper surface of the turntable 6 on which the material-to-be-cut is not placed. There is.

Left and right side portions of the base 2 (up and down in FIG. 4)
The base parts 12 and 13 are integrally formed in a protruding shape. The upper surfaces of the two bases 12 and 13 are arranged so that their heights are substantially aligned with the upper surface of the turntable 6.
Therefore, the upper surfaces of the pedestals 12 and 13 are also used as the mounting surface of the material to be cut. Further, a fence 14 is attached to the upper surfaces of the pedestals 12 and 13 so that the side surface of the material to be cut is applied and positioned for straddling the turntable 6. In FIG. 4, the right end surface of the fence 14 is a material-to-be-cut contact surface 14b with which the material-to-be-cut is in contact.
b corresponds to the plane passing through the center of the turntable 6. Therefore, in FIG. 4, the material to be cut is placed in the right half area of the turntable 6 on the right side of the fence 14, and the left half area is the area in which the material to be cut is not placed.

A scale 14 for indicating the turning angle of the turntable 6 is also provided on the circular arc portion at the center of the fence 14.
"a" is displayed, and the turning angle of the turntable 6 can be known by reading the value indicated by the corner line alignment line 9b of the scale 14a.

Next, as shown in FIGS. 3 and 4, the main body 4 is supported by the base 2 via the support arm 3. The support arm 3 is integrally formed with the turntable 6 at the rear end (the left end in FIG. 3) of the turntable 6, that is, the end of the blade plate 7 opposite to the side where the support protrusion 8 is provided. It is supported rotatably in the left-right direction via the formed bracket 31, its rotation center axis is located at substantially the same height as the upper surface of the base 2, and is substantially in the longitudinal direction of the blade plate 7. It extends in parallel. The support arm 3 supported in this way can be rotated to an arbitrary position by loosening the handle 41, and conversely, by tightening the handle 41, the support arm 3 is fixed at a fixed position. As a result, as shown in FIG. 6, the main body 4 is fixed at a position (indicated by a chain double-dashed line in the figure) tilted from the vertical position (the position indicated by a solid line in the drawing) to the left and right by a maximum of about 45 °. You can do it.

A slide support portion S for slidably supporting the main body portion 4 in the front-rear direction is incorporated at the tip of the support arm 3 supported by the turntable 6 and thus the base 2. The slide support S of this example
Is composed of two bearing cylinders 62, 63 as sleeves and one slide bar 60 as a spline shaft on which the bearing cylinders 62, 63 are slidably mounted in the axial direction but cannot rotate about the axis. Mainly composed of a set of angular ball splines.

The structure of the slide support portion S will be described with reference to FIGS. 1 and 2. A hollow cylindrical support cylinder portion 61 is integrally formed on the upper portion of the support arm 3, and the support cylinder portion is formed. Two bearing cylinders 62, 63 are coaxially fitted inside 61. In this example, the bearing cylinder portion is composed of the support cylinder portion 61 and two bearing cylinder bodies 62 and 63.

As shown in FIG. 2, ventilation grooves 61b are formed in the inner peripheral surface of the support cylinder portion 61 at quadrants in the circumferential direction. As shown in FIG. 1, each ventilation groove 61b has a support tubular portion 61b.
Is formed over the entire width in the axial direction.

Of the two bearing cylinders 62, 63, the bearing cylinder 62 on the right side in the figure is fixed by bolts 62b to 62b with the flange portion 62a being in contact with the right end surface of the support cylinder portion 61. The screw hole 6 into which the bolt 62b is tightened
As shown in FIG. 2, 1a is formed on the right end surface of the support tubular portion 61 at four circumferentially equally divided positions. On the other hand, in the flange portion 62a, insertion holes 62c having a diameter through which the bolts 62b can be inserted are formed on the circumference having the same diameter as that of the screw holes 61a at eight equal positions in the circumferential direction. Among the insertion holes 62c at the four positions, the four other positions are the bolts 6 described above.
It is used as a 2b insertion hole. Then, the other four insertion holes 62 shown by the chain double-dashed line in FIG.
In c, the bearing cylinder 62 on the right side in the drawing is attached in a state of being aligned with the ventilation groove 61b formed on the support cylinder portion 61 side. Therefore, the ventilation groove 61b and the insertion hole 6 are attached.
2c are paired to form a communication passage for communicating front and rear air chambers V1 and V2 described later.

A semicircular groove portion 62e for rolling the bearing balls 65 is formed on the inner peripheral surface of the bearing cylinder 62 as shown in FIG.
The groove portions 62e are formed so as to face a, and the groove portions 62e are respectively connected to the return holes 62d, so that two sets of tracks are formed.

The bearing cylinder 63 mounted on the left side of the drawing has the same structure as the above-mentioned bearing cylinder 62 on the right side of the drawing except that the flange portion 62a is not provided. Is fixed to the support cylinder portion 61 by bolts 62b, while the bearing cylinder body 63 on the left side in the drawing having no flange portion 62a is merely inserted into the support cylinder portion 61. Therefore, the load around the shaft, which is applied to the slide bar 60 to be described later, is the bearing cylinder 6 on the right side in the drawing
2, the axial moment is received by both bearing cylinders 62 and 63.

On the other hand, the double-bearing cylindrical body 6 thus constructed.
A slide bar 60 as a spline shaft, which is paired with 2, 63, is attached to the main body 4 side. That is,
The front end of the slide bar 60 supports the main body 4 on the support shaft 69.
A fork-shaped connecting portion 70 that is connected so as to be vertically tiltable via a
(See FIG. 3) is fitted and fixed to a bracket 71 formed integrally.

The slide bar 60 has a length that can secure the amount of slide required for the main body portion 4, and the outer peripheral surface of the slide bar 60 is a guide corresponding to the groove portions 62e of the bearing cylinders 62 and 63. A pair of grooves (only one is shown in the figure) is provided at the portions where the grooves 60a, 60a face each other in the diametrical direction. Both guide grooves 60a are formed in a straight line along the entire axis in the longitudinal direction along the axis of the slide bar 60. With the guide groove 60a and the groove portion 62e of the bearing cylinders 62 and 63 forming a pair and sandwiching the bearing balls 65 to 65 in a rollable manner, the slide bar 60 has an inner peripheral side of both bearing cylinders 62 and 63. Is inserted with a constant preload applied to
This constitutes a set of angular ball splines.

A cover 7 is provided on the outer peripheral surface of the support cylinder portion 61.
2 is installed so as to cover almost the entire surface,
Further, a fixing bolt 66 for immovably fixing the slide bar 60 is screwed into the upper portion of the support cylinder portion 61 so as to penetrate the cover 72. Further, the slide bar 60 is a hollow shaft in order to reduce its weight (see FIG. 2).

A cap 6 is provided at the rear end of the slide bar 60.
7a is attached, while the bracket 7 near the front end
A cap 67b having the same shape is attached to the No. 1 as well.
Cylindrical bellows 73 and 74 are attached between the rear (left side in the figure) cap 67a and the rear end of the cover 72, and between the front end of the cover 72 and the cap 67b. As a result, the portion of the slide bar 60 exposed from the support cylinder portion 61 is covered and is closed from the outside. Here, both ends of both bellows 73, 74 are attached to the caps 67a, 67b and the cover 72 in close contact with each other over the entire circumference, whereby the insides of both bellows 73, 74 are kept airtight and their dustproof function. And so on. From this,
These bellows 73 and 74 are provided in front of and behind the support cylinder 61,
Air chambers V1 and V2 closed from the outside are formed, and the air chambers V1 and V2 are in a state of being communicated with each other by the ventilation groove 61b and the insertion hole 62c.

Next, the main body 4 will be described. As described above, the base end portion 68 of the main body portion 4 is supported by the support shaft 69 on the bifurcated connecting portion 70, and is supported so as to be tiltable in the vertical direction about the support shaft 69. There is. The compression coil spring 75 mounted between the base end portion 68 and the bracket 71 supports the compression coil spring 75 so as to constantly urge it upward. In addition, the base end portion 68
While a bolt 78 is screwed in along the tilting direction, a stopper portion 79 with which the end portion of the bolt 78 can abut is provided on the bracket 71 side. The tilting limit can be adjusted by regulating the tilting limit to and adjusting the screwing degree of the bolt 78.

As shown in FIGS. 3, 4 and 6, the main body portion 4 integrally has a motor housing 5 for accommodating a motor M as a drive source. The motor housing 5 and the motor M are arranged obliquely with respect to the circular saw C, and with such an arrangement, the motor housing 5 is in a state where the circular saw C is positioned vertically to the base 2 (FIG. 6). (Indicated by a solid line in FIG. 2), the side portion of the main body 4 is projected obliquely upward. At the top of this motor housing 5,
A handle 96 is provided for the convenience of moving the main body 4.

Further, the main body portion 4 has a blade case 88 which covers and accommodates substantially the upper half of the circular saw C, and the blade case 88 is integrally provided with the base end portion 68 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 rotation center of the circular saw C. One end of the safety cover 89 is pivotally supported by a bracket 71. The lever 90 is linked to the lever 90 so that it can be rotated in the direction in which the circular saw C is exposed as the body portion 4 tilts downward.

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 integrally formed diagonally upward on the right side of the gear housing 91. In the motor housing 5, the motor M has its output shaft 94 obliquely upward with respect to the circular saw C by about 45.
The output shaft 94 has a pinion that meshes with the bevel gear 93.

Next, the operation of the circular saw machine 1 of the present embodiment constructed as above will be described. First, the material to be cut is placed in a state of straddling between the base portions 12 and 13 of the base 2,
A line 9a or 9 for applying a side portion to the material abutting surface 14b of the fence 14 or for fitting a corner line
Fix in the state of being aligned with reference to b.

Here, in the circular saw machine 1 of this embodiment, the circular saw C is cut into the blade plate 7 by the vertical cutting with the support arm 3 standing upright with respect to the base 2, and the blade hole 7a is formed. However, since the angle cutting is performed by inclining the support arm 3 to the right and the left with respect to the base 2, the blade opening 7a becomes wide and the corner line of the material to be cut is formed. It becomes impossible to accurately match the cutting position with the blade opening 7a as a reference. Therefore, conventionally, the position of the material to be cut has been adjusted so that the corner lines of the material to be cut are directly compared with the cutting edge so that the two match.

However, in the circular saw machine 1 of this example, the lines 9a to 9a for aligning the corner lines are drawn on the blade plate 7 in advance, and the positional relationship between these lines 9a to 9a and the circular saw C is, for example, By calculating it when forming the blade opening 7a for the first time, the corner line of the material to be cut can be accurately aligned with the cutting position with reference to the lines 9a to 9a.

Further, in the circular saw machine 1 of this example, a line 9b for aligning the corner lines is also drawn on the upper surface of the turntable 6, and this line 9b passes through the center of the turntable 6, that is, Since it is drawn at a position that matches the cutting edge, it is possible to easily and accurately align the material to be cut by matching the corner line with this line 9b.

After the material to be cut is aligned and fixed at a predetermined position in this way, a cutting operation is performed. For this, the circular saw C is in a vertical state with respect to the base 2 (indicated by a solid line in FIG. 6). (State shown), the main body 4 is tilted rightward or leftward with respect to the base 2 together with the support arm 3, and the circular saw C is slanted with respect to the base 2 (indicated by a chain double-dashed line in FIG. 6). It is possible to perform two operations of the angle cutting operation in the state shown).

When performing a vertical cutting operation, the support arm 3 is used.
Is set in a vertical state and is fixed by tightening the handle 41, and then the operator presses the handle 96 of the main body portion 4 from the upper side against the biasing force of the compression coil spring 75, so that the main body portion 4 is supported. On the other hand, when tilted downward about the support shaft 69, the safety cover 89 rotates to gradually expose the circular saw C, and when reaching the material to be cut, the material is completely exposed and the material to be cut is cut. . Then, when the bolt 78 on the base end portion 68 side reaches the lower limit which is regulated by hitting the stopper portion 79, the lower portion of the circular saw C penetrates the blade plate 7 and projects downward.

On the other hand, as shown by the chain double-dashed line in FIG. 6, the operator holds the handle 96 of the main body 4 against the urging force of the compression coil spring 75 while the support arm 3 is held inclined to the right. By pressing from, the material to be cut can be cut at an angle. At this time, at the lower limit where the bolt 78 on the base end portion 68 side and the stopper portion 79 are in contact with each other, the lower portion of the circular saw C is below the blade plate 7 by a distance substantially the same as in the case of the vertical cutting. Project to.

Even when the support arm 3 is tilted to the right side for angle cutting in this way, the motor housing 5
Is mounted in a state of being inclined obliquely upward, it is possible to perform angle cutting within a range of up to about 45 ° without interfering with the turntable 6 or the like. Also,
When the support arm 3 is tilted to the right to perform the angle cutting, there is no problem of interference of the motor housing 5, and the angle cutting can be performed within the range of about 45 ° at the maximum as shown in the figure.

Next, in the circular saw machine 1 of this example, the main body 4 is supported by the slide support S so as to be movable along the surface direction of the turntable 6, so that the vertical cutting or In any case of angle cutting, the main body 4
Can be moved in the front-back direction to perform a cutting operation.
That is, 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 handle 96 of the body portion 4 is pulled out to the front, the body portion 4 slides on the support cylinder portion 61 of the slide bar 60. With the movement of, for example, when the material to be cut is wide,
A cutting operation over the entire width can be performed with the forward movement of the circular saw C.

As described above, according to the circular saw machine 1 of this embodiment, in the slide support S, the portion of the slide bar 60 exposed from the support cylinder 61 is closed from the outside by the bellows 73 and 74. By doing this, the same part is protected against dust and rust. Moreover, the air chamber V1 that is airtightly closed to the outside is provided in the front and rear of the support cylinder portion 61.
, V2 are formed, but both air chambers V1, V2
Are communicated with each other by a ventilation groove 61b formed in the support cylinder portion 61 and an insertion hole 62c formed in the flange portion 62a of the bearing cylinder body 62, and the ventilation groove 61b and the insertion hole 62c are formed at four circumferential positions. Since the total opening area of the slide bar is set to be sufficiently large, the slide bar 60
When the front and rear bellows 73 and 74 expand and contract due to the relative movement of the air, air is exchanged between the air chambers V1 and V2, and the movement of the air is sufficiently fast. From this, the slide bar 60 can be moved smoothly and quickly without receiving any air resistance, so that the operability when moving the main body 4 is significantly improved as compared with the conventional one, and the conventional operation is also improved. No more unpleasant breath sounds are emitted.

Here, in this example, the slide supporting portion of a so-called single supporting structure, which is composed of a set of angular ball splines, has been described as an example, but the present invention is applied to the slide supporting portion of a so-called two supporting structure. Is also applicable.

Next, the slide support portion S has a so-called single support structure using a pair of angular ball splines including bearing sleeves 62 and 63 as sleeves and a slide bar 60 as a spline shaft. . For this reason, a conventional two-support structure in which two sets of linear slide mechanisms are arranged at regular intervals in the left-right direction (for example, Japanese Utility Model Laid-Open No. 62-162001, Japanese Utility Model Laid-Open No. 3-12940).
1), the lateral width of the slide support S is smaller and the number of the slide bar 60 that is pulled out forward is one, so the tilt angle when performing angle cutting is set to be large. Further, it becomes possible to cut a material having a large plate thickness at an angle.

The rattling of the main body 4 in the left-right direction is
Since it is solved by applying a constant preload between the bearing cylinders 62 and 63 and the slide bar 60 to eliminate the backlash between them, it is not necessary to separately provide a special mechanism for that, unlike the conventional case. Also in this respect, the slide support S
Can be made compact.

Further, since the angular type ball spline is used, the axial direction cutting load applied at the time of cutting can be received by the bearing cylinders 62 and 63, thereby enhancing the durability of the circular saw machine 1. be able to.

In this example, as a means for communicating the air chambers V1 and V2 with each other, the ventilation groove 61 is formed in the support cylinder portion 61.
Although b has exemplified the configuration in which the insertion hole 62c is formed in the bearing tubular body 62, the present invention is not limited to this, and, for example, although not shown, a ventilation pipe is provided between both bellows,
The air chambers V1 and V2 may be communicated with each other via the ventilation pipe.

Further, in this example, the bearing cylinders 62 and 63 as sleeves forming the angular ball spline are arranged on the base 2 side, and the slide bar 60 as a spline shaft is provided.
However, the configuration is not limited to this, and the configuration may be reversed.

Since this example is configured as described above,
Even if the blade 7a cannot be used as a line for corner line alignment due to the thickening of the blade 7a due to the angle cutting, the line 9b drawn on the upper surface of the table 6
Since it can be used as a line for corner line alignment, it is always possible to accurately and easily align the corner lines, that is, to position the material to be cut, and thus to perform highly accurate cutting work efficiently. Become. Moreover,
This line 9b is used for the material contact surface 14 of the fence 14.
the upper surface of the turntable 6 in the area behind b,
That is, since the material to be cut is drawn on the upper surface on the side where it is not placed, even if a large material to be cut is placed, for example, this line 9b will not be hidden by the material to be cut, and in this respect as well. It is possible to always perform accurate corner line alignment.

Further, the fence 14 is provided with a scale 14a for displaying the rotation angle of the turntable 6,
The rotation angle of the turntable 6 can be accurately known by reading the value indicated by the line 9b on the scale 14a. As described above, the line 9b does not only function as a line for aligning the corner lines, but also has a function as a pointer for displaying the rotation angle of the turntable 6. In particular, when cutting a large material to be cut and the scale 2a displayed on the front surface of the base 2 is hidden by the material to be cut, the value indicated by the line 9b using the scale 14a of the fence 14 as a guideline. It is possible to set the rotation angle of the turntable 6 accurately by reading the scale 14
a and line 9b work effectively.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a slide support portion showing an embodiment of the present invention.

2 is a cross-sectional view taken along the line BB of FIG. 1, which is a vertical cross-sectional view of a bearing cylinder and a slide bar.

FIG. 3 is an overall side view of a tabletop circular saw machine.

FIG. 4 is an overall plan view of a tabletop circular saw machine.

FIG. 5 is a plan view of a turntable and a base.

FIG. 6 is a front view of the tabletop circular saw, showing a state where the main body of the circular saw is tilted to the left and right.

[Explanation of symbols]

 1 ... Desktop circular saw machine S ... Slide support section 2 ... Base 3 ... Support arm 4 ... Circular saw machine body 6 ... Turntable 7 ... Blade plate 60 ... Slide bar 61 ... Support cylinder portion 61b ... Ventilation groove 62, 63 ... Bearing cylinder 62c ... Insertion holes 73, 74 ... Bellows V1, V2 ... Air chamber

 ─────────────────────────────────────────────────── ───Continued from the front page (56) Bibliography Sho 63-18202 (JP, U) Rikai 63-132701 (JP, U) Rikai Hei 2-80401 (JP, U)

Claims (1)

(57) [Claims] 1. A base for positioning a material to be cut, which is rotatably supported by the base, and a fence for positioning the material to be cut, which is arranged across the table. And a circular saw machine main body supported by the base so as to be movable in the vertical direction above the table, the surface of the table being in contact with the material to be cut of the fence. A tabletop circular saw machine characterized in that a line for aligning the corner lines for positioning the material to be cut with respect to the circular saw machine body is provided in a range behind the table.