JP5000471B2 - Cutting material positioning fence in tabletop cutting machine - Google Patents

Description

The present invention relates to a tabletop cutting machine in which a cutting machine body having a rotary cutting tool such as a circular saw blade is moved down to cut a cutting material fixed on a table, and the cutting material is used as a rotary cutting tool. It relates to a fence for positioning.
In this specification, the cutting process includes, in addition to a machining mode for separating the workpiece, a grooving process for cutting the workpiece without separating the workpiece, and a process for grinding the workpiece.

This type of tabletop cutting machine is provided with a table for placing a cutting material on the upper surface and a cutting machine main body provided so as to be movable up and down with respect to this table. There is provided a table (rotary table) supported so as to be horizontally rotatable. When the rotary table is horizontally rotated, the cutting machine main body horizontally moves to the right side or the left side along an arc locus centering on the rotation center of the rotary table. In a tabletop cutting machine equipped with such a rotary table, the rotary table is rotated at a certain angle in the horizontal direction, so that the rotary cutter is obliquely viewed at a certain angle with respect to the reference surface of the cutting material in plan view. Can be cut (tilted).
A fence for positioning the cutting material is provided above the rotary table. A reference surface of the cutting material is brought into contact with the material contact surface of the positioning fence so that the cutting material is positioned on the rotary table. This positioning fence is fixed between both sides of the base that supports the rotary table and is supported so as to straddle the upper side of the rotary table, and avoids interference between the lower end and the upper surface of the rotary table. Therefore, a slight gap is provided (to allow the rotary table to rotate).
Conventionally, various techniques for this positioning fence are disclosed in the following patent documents.
JP 7-47502 A

However, the conventional positioning fence has the following problems. As described above, the conventional positioning fence is configured to be fixed to both side portions of the base located on both the left and right sides of the rotary table and supported in a state of striding over the rotation center of the rotary table. As the size of the positioning fence is increased, the support span of the positioning fence is increased. As a result, there is a problem that the positioning fence is increased in size (thickened) from the viewpoint of securing necessary rigidity for the positioning fence. If sufficient rigidity is not secured to the positioning fence, the rotational torque (cutting force) of the rotary blade added to the center of the span through the cutting material, the cutting material is abutted by the user when positioning the cutting material, or When another article collides, the positioning fence is likely to bend in the table surface direction at the center of the span, and in some cases, the positioning fence may be deformed to prevent accurate positioning.
It is an object of the present invention to provide a positioning fence that does not cause problems such as bending as in the prior art even if it is downsized as a result of increased support rigidity as compared with the prior art.

For this reason, this invention was set as the positioning fence of the structure described in each claim of a claim.
According to the positioning fence of claim 1, since it is supported with respect to the base at three points in the center of the span in addition to the both sides in the longitudinal direction (table radial direction), the conventional support structure only on both sides In comparison, the deflection in the direction of the table surface in the central portion can be eliminated or greatly reduced, so that accurate positioning can be performed over a long period of time.
According to the positioning fence of the second aspect, the center of the span can be firmly supported with respect to the base without causing any trouble with respect to the rotating operation of the rotary table.
According to the positioning fence of the third aspect, it is possible to secure the support rigidity of the rotary table while firmly supporting the central support portion with respect to the base.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the entire tabletop cutting machine 1 provided with a positioning fence 20 according to the present embodiment. The tabletop cutting machine 1 according to the present embodiment is characterized by the support structure of the positioning fence 20 for positioning the cutting material W on the rotary table 2, and other basic configurations as a cutting machine are the same as the conventional one. The same is sufficient, and no particular change is required in the present embodiment, and therefore detailed description thereof is omitted.
The tabletop cutting machine 1 includes a rotary table 2 for placing a cutting material W on an upper surface, a base 3 that rotatably supports the rotary table 2 in a horizontal direction (left and right in a plan view), and a rotation. A cutting machine main body 10 supported so as to be tiltable up and down is provided via a main body support portion 5 provided at the rear portion (left side portion in FIG. 1) of the table 2. In FIG. 1, the user is located on the right side of the tabletop cutting machine 1.
The cutting machine main body 10 is supported by a tip end portion of a support arm 5a of the main body support portion 5 through a main body support shaft 11 so as to be tiltable up and down. The cutting machine body 10 includes a circular rotary blade 12 that rotates using a drive motor (not shown) as a drive source. The rotary blade 12 is attached to the spindle 16. The range of the upper half circumference of the rotary blade 12 is covered with the main body case 13. A range of a substantially lower half circumference of the rotary blade 12 is covered with a safety cover 14 that opens and closes in conjunction with the vertical movement of the cutting machine body 10. On the back side of the main body case 13, a handle portion 15 that is gripped by the user is provided.
When the user located on the right side in FIG. 1 of the tabletop circular saw 1 grips the handle portion 15 and tilts the cutting machine body 10 downward, the safety cover 14 is opened in conjunction with this, and the rotary blade that rotates. 12 is exposed, and the exposed portion is cut into the cutting material W.

The left and right side portions of the base 3 protrude from the left and right side portions of the rotary table 2 to the side. An auxiliary table portion 3a is provided at each of the left and right protruding portions. The upper surfaces of the auxiliary table portions 3a and 3a are flush with the upper surface of the rotary table 2, respectively. When the cutting material W is large, the auxiliary table portion 3a functions as a part of the table.
As shown in FIG. 3, the turntable 2 is supported by a rotation support portion 30 provided on the upper surface of the base 3 so as to be horizontally rotatable in a certain angle range. A cylindrical receiving portion 31 is integrally provided at the center of the upper surface of the base 3. The receiving portion 31 is opened upward. A rotating shaft 32 is attached to the center of the receiving portion 31. In this example, hexagon bolts are used for the rotating shaft 32. The screw shaft portion 32a of the rotating shaft 32 is fastened to the base 3 side at the bottom of the receiving portion 31. For this reason, the rotating shaft 32 is fixed in a state of protruding upward from the bottom of the receiving portion 31.
A support boss portion 33 provided at the center of the lower surface of the turntable 2 is inserted into the inner peripheral side of the receiving portion 31 so as to be relatively rotatable. The rotating shaft 32 is inserted in the center of the support boss portion 33 so as to be relatively rotatable. The rotation shaft 32 becomes the rotation center C of the turntable 2.
The rotating shaft 32 protrudes further upward from the support boss portion 33. A center support portion 22a of the positioning fence 20 described later is coupled between the protruding portion and the head portion 32b of the rotary shaft 32 in a state of being sandwiched between two thrust bearings 34 and 35. By being sandwiched between the two thrust bearings 34 and 35, the central support portion 22a is supported so as not to be displaced in the axial direction and to be rotatable relative to the rotary table 2, so that the rotary table 2 is allowed to rotate. It has become so.
With this single rotating shaft 32, the support boss portion 33 of the rotary table 2, the two thrust bearings 34 and 35, and the central support portion 22 a of the positioning fence 20 are coupled to the receiving portion 31 of the base 3 so as not to be axially displaceable. Has been.
The rotary table 2 includes a generally circular table main body 2a and a table extension 2b protruding in a radial direction with a certain width from a user side of the table main body 2a. The upper surface of the table main body 2a and the upper surface of the table extension 2b are flush with each other. The blade edge plate 6 is attached in a state straddling between the upper surface of the table body 2a and the upper surface of the table extension 2b. A blade edge 6 a that is long in the radial direction is provided along the center of the blade edge plate 6 in the width direction. The rotary blade enters the blade edge 6a. The blade edge 6a passes through the rotation center (table rotation center C) of the rotary table 2 as viewed in a plan view. A position where the blade edge 6a is orthogonal to a positioning surface 21a of the positioning fence 20 described below when viewed in plan is a reference position S of the turntable 2. By positioning the rotary table 2 at the reference position S, the cutting material W is cut at a right angle.

As shown in FIG. 2, the positioning fence 20 integrally connects the cutting material abutting portions 21 and 21 positioned on the left and right sides with respect to the rotation center C of the turntable 2 and the both cutting material abutting portions 21 and 21. The coupling part 22 having a semicircular shape in plan view is provided.
A slight gap is set between the lower ends of both of the cutting material abutting portions 21 and 21 and the coupling portion 22 and the upper surface (cutting material placement surface) of the rotary table 2. Since the positioning fence 20 is supported across the rotary table 2 with a slight gap, the rotary table 2 is rotated without interfering with the positioning fence 20.
The side surfaces on the user side of both cutting material abutting portions 21 and 21 are positioning surfaces 21a with which the reference surface Wa of the cutting material W abuts. Both positioning surfaces 21a, 21a are flush with each other. The cutting material W is fixed on the turntable 2 with the reference surface Wa in contact with one or both positioning surfaces 21a.
As shown in FIG. 2, the extended surface between the positioning surfaces 21 a and 21 a passes through the rotation center C of the turntable 2 when viewed in plan. Both positioning surfaces 21 a and 21 a (extension surfaces thereof) are orthogonal to the upper surface of the turntable 2.
The left and right cutting material abutting portions 21 and 21 are positioned with an interval for allowing the rotary blade 12 to pass therethrough. This interval is appropriately set in consideration of the inclination angle of the rotary blade 12 when performing so-called inclination cutting. The rotation center C of the turntable 2 coincides with the extended surfaces between the positioning surfaces 21a and 21a between the two cutting material contact portions 21 and 21.

Both cutting material abutting portions 21, 21 are integrally coupled by a coupling portion 22 on the back side as viewed from the user side. The positioning fence 20 of the present embodiment is supported at three points with respect to the base 3. The positioning fence 20 of the present embodiment is supported by the base 3 at three locations, that is, the left and right cutting material contact portions 21 and 21 and the central coupling portion 22. A support shaft 23 is attached to each of the left and right cutting member abutting portions 21 and 21 so as to protrude downward toward the base 2 side. Both the support shafts 23, 23 are protruded to the lower surface side of the rotary table 2 through insertion groove portions 2 c provided on the rotary table 2, and the protruding tip ends are fixed to the upper surface of the base 2. Both insertion groove portions 2 c and 2 c are formed in an arc shape along the same circumference around the rotation center C of the turntable 2. Thereby, the turntable 2 is rotated without interfering with the fence 20. In the present embodiment, hexagon bolts are used for the support shaft 23.
The coupling portion 22 is formed in a semicircular shape in plan view in consideration of an angle change when the rotary blade 12 is inclined, and has a mortar shape on the inner peripheral side thereof in order to avoid interference with the rotary blade 12. An inclined inner peripheral side inclined surface 22b is provided. The center support portion 22a is integrally provided at the center in the circumferential direction of the inner peripheral inclined surface 22b. The central support portion 22a passes through the rotary table 2 from the upper surface side to the lower surface side through the central relief portion 2d provided at the center of the rotary table 2, and extends to the lower surface side. An insertion hole 22c having a diameter through which the rotation shaft 32 can be inserted is provided at the tip of the central support portion 22a. The rotation shaft 32 is inserted through the insertion hole 22 c, and the distal end portion of the center support portion 22 a is coupled to the rotation shaft 32.
The center relief portion 2d is formed in a circular arc shape in plan view along the periphery of the table rotation center C in order to avoid interference with the center support portion 22a and allow the rotation operation of the turntable 2 within a certain angle range. Yes.
An angle scale 25 is displayed along the right insertion groove 2c in FIG. 2 among the both insertion groove portions 2c, 2c provided on the turntable 2. By reading this angle scale 25 with the pointer 24 attached to the positioning fence 20, the rotation angle of the turntable 2 from the reference position S can be set accurately.
The left and right cutting member abutting portions 21 and 21 are provided with two cylindrical support holes 21b and 21b each opened upward. These support holes 21 b to 21 b are used to support a vise device for fixing the cutting material W on the rotary table 2.

According to the positioning fence 20 of the present embodiment described above, the center portion (span center portion) is supported by the base 3 in addition to the conventional both side portions (support shafts 23, 23). The support rigidity can be significantly increased as compared with the conventional case. In particular, since the support rigidity with respect to the rotational torque of the rotary blade 12 applied by the external force P in the table surface direction and applied through the cutting W is increased, the deflection in the same direction can be eliminated or significantly reduced as compared with the conventional case. Thus, since the relative positions of the left and right positioning surfaces 21a, 21a with respect to the rotary blade 12 during the cutting process can be reliably held at a fixed position, a highly accurate cutting process can be performed over a long period of time.
In addition, in the conventional positioning fence, in addition to a support shaft (a support shaft corresponding to the support shaft 23 of the present embodiment) that passes through the rotary table in order to increase its support rigidity, for example, an auxiliary table portion provided on the left and right sides However, according to the positioning fence 20 of the present embodiment, in addition to the support at the left and right at one place, the support at the center of the span is adopted. Accordingly, high support rigidity can be ensured by a total of three support points, and the support structure can be simplified.
Furthermore, conventionally, it has been necessary to secure the supporting rigidity by increasing the thickness of each part of the positioning fence, but according to the positioning fence 20 of the present embodiment, it is possible to achieve a thinner wall than before, and consequently The desk cutting machine can be reduced in weight.

Various modifications can be made to the embodiment described above. For example, the support structure on both sides of the positioning fence 20 is illustrated as being supported on the base 3 via the support shafts 23 and 23 through which the insertion groove portions 2c and 2c provided on the rotary table 2 are passed. Alternatively, instead of this, the both side portions may be supported with respect to the auxiliary table portions 3a and 3a. When the support structure for the auxiliary table portions 3a and 3a is adopted instead of the support shafts 23 and 23, the insertion groove portions 2c and 2c of the rotary table 2 can be omitted.
Further, the thrust bearings 34 and 35 may be changed to metal bearings having high slidability.
Furthermore, although the configuration in which the center support portion 22a is coupled to the rotation shaft 32 of the rotation support portion 30 has been illustrated, a configuration in which the center support portion 22a is screw-coupled to other portions of the base 3, for example, the side portion of the receiving portion 31 may be employed. In this case, the thrust bearings 34 and 35 can be omitted.

It is a whole side view of the desk circular saw machine provided with the positioning fence concerning this embodiment. It is an arrow (2) arrow view in FIG. 1, Comprising: It is a top view of a turntable. FIG. 3 is a sectional view taken along line (3)-(3) in FIG. 2 and is a longitudinal sectional view of a rotary table and a base.

Explanation of symbols

W: Cutting material, Wa: Reference plane 1: Desk circular saw 2 ... Rotary table 2a ... Table body 2b ... Table extension 2c ... Inserting groove 2d ... Central relief 3 ... Base 3a ... Auxiliary table DESCRIPTION OF SYMBOLS 5 ... Main body support part, 5a ... Support arm 6 ... Blade edge plate, 6a ... Blade edge 10 ... Cutting machine main body 11 ... Main body support shaft 12 ... Rotary blade 20 ... Positioning fence 21 ... Cutting material contact part, 21a ... Positioning surface , 21b ... support hole 22 ... coupling part, 22a ... center support part, 22b ... inner peripheral side inclined surface, 22c ... insertion hole 23 ... support shaft 24 ... pointer 25 ... angle scale 30 ... rotation support part 31 ... receiving part 32 ... Rotation shaft, 32a ... Screw shaft portion, 32b ... Head portion 33 ... Support boss portions 34, 35 ... Thrust bearing C ... Table rotation center S ... Reference position of rotation table

Claims (3)

A tabletop cutting machine comprising a rotary table for fixing a cutting material supported on a base so as to be horizontally rotatable and a cutting machine body for cutting the cutting material fixed on the rotary table. A fence for positioning cutting material supported on both sides in the table radial direction in a state straddling the direction,
The positioning fence which provided the center support part in the span center between the said both sides, and let this center support part pass the said rotary table, and was couple | bonded with the said base side. The positioning fence according to claim 1, wherein a center of a span between the both side portions is coupled to a rotation support portion that rotatably supports the rotary table of the base. 3. The positioning fence according to claim 2, wherein a center support portion provided at the center of the span is coupled to the rotation support portion via a thrust bearing.

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