JP4762607B2 - Guide device for cutting machine - Google Patents

Description

  The present invention relates to a guide device for linearly moving a portable cutting machine that an operator holds in his hand and cuts a cutting material.

A portable cutting machine in which a cutting material is cut by a cutting blade protruding downward from a base that is in contact with the upper surface of the cutting material when an operator places the cutting machine body on the cutting material and moves it. There is provided a guide provided with a guide device for moving a cutting machine body straightly along a straight line.
In general, the guide device includes a guide plate having a linear guide convex portion extending in the cutting direction on the upper surface side and a guide concave portion provided on the base side, and the guide convex portion is inserted into the guide concave portion. By moving the cutting machine on the upper surface side of the guide plate, the cutting machine can be moved straight along the cutting direction.
In such a guide device, an appropriate clearance (gap) is required to ensure the slidability between the guide convex portion and the guide concave portion, but if this clearance is large, the direction perpendicular to the cutting direction is required. It becomes rattling and the straightness of the cutting machine body is impaired.
Conventionally, a technique for solving this problem is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-300703. This prior art is shown in FIG. 8 using FIG. 2 of the publication. According to this prior art, the adjustment component 31 is provided in the guide recess 36a of the guide member 36 attached to the base side of the cutting machine via the bracket 35 so as to be movable in a direction perpendicular to the cutting direction. By moving, the width of the guide recess 30a (guide width L) is adjusted, and the backlash between the guide protrusion 32 provided on the upper surface of the guide plate 34 along the cutting direction is eliminated.
JP-A-11-300702

However, the conventional guide device 30 has a point to be improved mainly in operability. That is, the adjusting member 31 in the conventional guide device 30 is guided by moving the inside of the guide recess 36a in the width direction by loosening the fixing screws 37, 37 (one is not shown) provided in the front and rear of the cutting direction. The width L can be adjusted, and the position of the adjusting member 31 is fixed by tightening the front and rear fixing screws 37 while holding the position of the adjusting member 31 in the adjusted state. The configuration was fixed. For this reason, the operation of loosening or tightening the front and rear fixing screws 37, 37, or the operation of tightening the fixing screws 37, 37 while holding the adjustment position of the adjusting member 31 is troublesome. In this respect, operability (usability) There was a need to improve.
The present invention has been made to solve this problem, and an object of the present invention is to provide a guide device including a shaki adjustment mechanism with good operability.

In order to solve this problem, the present invention provides a guide device having a configuration described in each claim.
According to the guide device of the first aspect, when the adjusting screw is rotated in the tightening direction, the regulating member is pressed against the guide convex portion, thereby minimizing the gap between the guide convex portion and the guide concave portion. Therefore, backlash in the cutting width direction is suppressed, and the cutting machine can be moved in the cutting width direction without backlash. As described above, the gap between the guide convex portion and the guide concave portion can be minimized or eliminated by a simple operation by simply rotating the adjustment screw of the rattle adjustment mechanism. Can be better.
According to the guide device of the second aspect, the above-described effects can be obtained with a simple configuration by using an elastic ring having an elastic force in the radial direction.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an entire cutting machine 1 provided with a guide device 10 described below. In the embodiment described below, a portable circular saw called so-called plunge marnoco is illustrated as an example of a cutting machine.
The cutting machine 1 includes a cutting machine main body 2 provided with a circular saw blade (not shown in the figure) that is rotated by an electric motor 4, and a base 3 that supports the cutting machine main body 2 on the upper surface side. In the present embodiment, the cutting machine main body 2 is the same as that of the conventional configuration and does not need to be changed in detail, and thus detailed description thereof is omitted. In addition, the code | symbol 5 in the figure has shown the blade case of the cutting machine main body 2. FIG. A circular saw blade is rotatably accommodated in the blade case 5. The saw blade protrudes to the lower surface side through a window provided in the base 3. In addition, the electric motor 4 protrudes from the back side of the blade case 5 (front side in FIG. 1). On the upper part of the electric motor 4, a handle portion 6 that is held by an operator is provided. Although not shown, the lower side of the saw blade protrudes from the lower surface of the base 3. The operator is located on the right side of the cutting machine 1 in FIG. 1 and grips the handle portion 6 at this position to move the cutting machine 1 to the left side in the drawing along the upper surface of the cutting material (not shown in the figure). As a result, the cutting material is cut at the portion protruding to the lower surface side of the base 3 of the saw blade.
Now, the guide device 10 in the present embodiment includes a guide plate 11 that is placed on the upper surface of the cutting material during a cutting operation, and a guide portion 12 that is provided on the base 3 of the cutting machine 1.
As shown in the figure, the guide plate 11 has a rectangular flat plate shape that is long in the cutting direction, and a guide convex portion 11a is provided on the upper surface thereof. The guide convex portion 11a is provided continuously over the entire range from the front end to the rear end of the guide plate 11 in the cutting direction. In this embodiment, the guide plate 11 is manufactured using an aluminum drawing material as a material.
The cutting machine 1 is placed on the upper surface of the guide plate 11. Although not visible in FIG. 1, the cutting blade of the cutting machine 1 protrudes downward from the side of the guide plate 11 through the window portion of the base 3.
The base 3 is superimposed on the upper surface of the guide plate 11. On the lower surface of the base 3, a U-shaped guide recess 3a that opens downward is provided along the cutting direction. The guide convex portion 11a of the guide plate 11 is fitted in the guide concave portion 3a. By relatively moving the guide convex portion 11a in the guide concave portion 3a, the cutting machine 1 is guided along the guide convex portion 11a. Both side surfaces of the guide convex portion 11a are formed as flat surfaces parallel to each other, and each is formed in advance along a straight line accurately.

The backlash adjustment mechanisms 13 and 13 are provided at two locations near the front and rear in the cutting direction of the guide recess 3a. Both the backlash adjustment mechanisms 13, 13 have the same configuration. FIG. 2 shows details of the backlash adjustment mechanism 13 closer to the front in the cutting direction (left side in FIG. 1).
A cylindrical wall 3b is formed on the upper surface of the base 3 and on the side of the guide recess 3a. A boss 3c is provided at the center of the cylindrical wall 3b. A screw hole 3d is formed at the center of the boss 3c. A screw shaft 16b of an adjusting screw 16 that is picked by a fingertip and rotated in a screw tightening direction or a screw loosening direction is screwed into the screw hole 3d. When the adjusting screw 16 is rotated in the screw tightening direction, the screw shaft 16b is tightened into the screw hole 3d of the boss portion 3c, so that the adjusting screw 16 is downward (in the direction of entering the cylindrical wall portion 3b). Displace to When the adjustment screw 16 is rotated in the screw loosening direction, the screw shaft 16b is loosened with respect to the screw hole 3d, so that the adjustment screw 16 is displaced upward (in the direction of exiting from the cylindrical wall portion 3b).
An inclined surface 16a is formed on the lower outer peripheral corner of the adjustment screw 16 over the entire circumference. The inclined surface 16a is inclined at approximately 45 ° with respect to the screw shaft 16b. A regulating member 17 is sandwiched between the inclined surface 16a and the inner bottom portion of the cylindrical wall portion 3b. In the present embodiment, a rubber elastic ring having elasticity in the radial direction is used for the restricting member 17. Further, a restricting window portion 3e is formed in the vicinity of the bottom of the cylindrical wall portion 3b. The inner side of the cylindrical wall 3b is communicated with the guide recess 3a through the restricting window 3e. The restriction member 17 is exposed to the guide recess 3a side through the restriction window 3e.
In the present embodiment, the adjustment screw 16, the screw shaft 16b, the regulating member 17, the regulating window 3e of the cylindrical wall 3b, and the like constitute the backlash adjusting mechanism 13.

According to the guide device 10 configured as described above, the guide convex portion 11a of the guide plate 11 is orthogonal to the cutting direction at least at two front and rear sides in the cutting direction in the guide concave portion 3a provided in the base 3 of the cutting machine 1. The cutting machine 1 is fitted in a state in which there is almost no gap in the direction to be cut or in a state where the gap is made as small as possible, and the cutting machine 1 is placed on the upper surface of the guide plate 11 in this state. For this reason, when the cutting machine 1 is moved in the cutting direction, the guide concave part 3a is guided by the guide convex part 11a, whereby the cutting machine 1 can be accurately moved along a straight line. Can be cut straight.
Moreover, according to the guide device 10 of the present embodiment, when the adjustment screw 16 is rotated in the tightening direction, the screw shaft 16b is tightened into the screw hole 3d and the adjustment screw 16 is displaced downward. When the adjustment screw 16 is displaced downward, the inclined surface 16a is displaced downward. When the inclined surface 16a of the adjusting screw 16 is displaced downward, the regulating member 17 sandwiched between the inclined surface 16a and the bottom portion of the cylindrical wall portion 3b is expanded by the inclination action of the inclined surface 16a to increase the diameter. When the diameter of the restricting member 17 is increased, a part of the restricting member 17 enters the guide recess 3a through the restricting window 3e. When the diameter of the restricting member 17 expands and a part of the restricting member 17 enters the guide recessed portion 3a, the restricting member 17 is pressed against the side of the guide protruded portion 11a.
As described above, the regulating member 17 is pressed against one side portion of the guide convex portion 11a by the rotation operation of the adjusting screws 16 and 16 of the backlash adjusting mechanisms 13 and 13 provided at two places in the front and rear in the cutting direction. The side portion of the guide concave portion 3a is pressed against the other side portion of the guide convex portion 11a, so that the gap between the side portion of the guide convex portion 11a and both side portions of the guide concave portion 3a can be made zero, Alternatively, the gap can be made as small as possible. Since there is no gap between the guide convex portion 11a and the guide concave portion 3a at two places in the front and rear in the cutting direction, rattling in the direction orthogonal to the cutting direction of the guide concave portion 3a with respect to the guide convex portion 11a is suppressed or eliminated. 1 can be accurately moved along the straight line in the cutting width direction without rattling, and as a result, highly accurate straight line cutting can be performed.
From the above, according to the present embodiment, the guide recess 3a is not rattled with respect to the guide protrusion 11a only by the operation of rotating the adjustment screws 16 and 16 of the backlash adjustment mechanisms 13 and 13 provided at the two front and rear positions in the cutting direction. Since it can be eliminated, the operability of the backlash adjustment mechanisms 13 and 13 can be improved as compared with the conventional case.

The pressing force of the side portion of the guide concave portion 3a and the pressing force of the regulating member 17 with respect to the side portion of the guide convex portion 11a are arbitrarily adjusted by the rotation operation amount of the adjusting screw 16 and the tightening amount of the screw shaft 16b with respect to the screw hole 3d. be able to.
When the amount of rotation operation in the tightening direction of the adjusting screw 16 is increased, the tightening amount of the screw shaft 16b with respect to the screw hole 3d is increased, and the inclined surface 16a is displaced further downward. Then, it is pressed against the guide convex portion 11a with a larger force. For this reason, in this case, since the side portion of the guide concave portion 3a is pressed with a large force by the side portion of the guide convex portion 11a, the pressing force becomes a sliding resistance and moves relative to the guide plate 11 of the cutting machine 1. The operation becomes heavy or can be fixed immovable.
On the contrary, as shown in FIGS. 4 and 5, when the amount of rotation of the adjusting screw 16 in the loosening direction is increased, the tightening amount of the screw shaft 16b with respect to the screw hole 3d is decreased and the inclined surface 16a is displaced upward. Therefore, the diameter expansion amount of the restricting member 17 is reduced and the pressing force against the guide convex portion 11a is reduced, whereby the cutting machine 1 can be moved with a light force.
Further, when the adjusting screw 16 is further rotated in the loosening direction to displace the inclined surface 16a further upward, the pressing of the regulating member 17 against the guide convex portion 11a is released.
As described above, according to the guide device 10 of the present embodiment, the clearance between the guide convex portion 11a and the guide concave portion 3a becomes zero or as small as possible only by the rotation operation of the adjustment screw 16, and the cutting width direction is reduced. It can be in a state without rattling. In addition, by appropriately adjusting the rotation operation amount (tightening amount) of the adjustment screw 16, the pressing force of the regulating member 17 against the guide convex portion 11a can be arbitrarily adjusted, and as a result, the cutting machine 1 during the cutting operation. The operating force required to move the can be arbitrarily adjusted according to, for example, the work content or the operator's preference.

Various modifications can be made to the embodiment described above. For example, although the rubber elastic ring is illustrated as the restricting member 17, as another form of the elastic ring, a C-shaped resin ring having a notch 18 a as shown in FIGS. 6 and 7 may be used as the restricting member 18. it can. This restricting member 18 also has elasticity in the diameter increasing direction. The outer peripheral surface 18c of the restriction ring 18 is formed in a plane parallel to the central axis. For this reason, it is possible to press the side surface of the guide convex portion 11a in a line-contact state by rotating the adjusting screw 16 so that the diameter of the restricting member 18 is increased against the elasticity, and more reliably against the guide convex portion 11a. The backlash of the guide recess 3a can be eliminated.
Further, by providing the inclined surface 18b on the inner peripheral side of the upper surface of the restricting member 18, the restricting member 18 can be engaged with the inclined surface 16a of the adjusting screw 16 in a surface contact state or a line contact state. Therefore, the restricting member 18 can be smoothly expanded or contracted in diameter, and in this respect, the reliable operation of the guide device 10 can be ensured over a long period of time.
Furthermore, although the structure which provides the rattling adjustment mechanisms 13 and 13 in two places before and behind in a cutting direction was illustrated, it is good also as a structure provided in one place or three places or more.

It is the whole cutting machine perspective view provided with the guidance device concerning the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line (2)-(2) in FIG. 1, and is a vertical cross-sectional view of a rattling adjustment mechanism of the guide device. This figure shows a state in which the adjustment knob is rotated in the tightening direction to press the regulating member against the guide convex portion, thereby eliminating backlash between the guide concave portion. FIG. 3 is a sectional view taken along line (3)-(3) of FIG. It is a longitudinal cross-sectional view of the rattling adjustment mechanism of the guide device. This figure shows a state where the adjustment knob is rotated in the loosening direction to release the pressing of the restricting member against the guide convex portion. FIG. 5 is a sectional view taken along line (5)-(5) of FIG. It is a longitudinal section of the rattling adjustment mechanism concerning another embodiment of the present invention. It is the perspective view which showed independently the control member used for embodiment shown in FIG. It is a perspective view of the conventional guide apparatus. This figure is a drawing that uses FIG. 2 of Japanese Patent Laid-Open No. 11-300702.

Explanation of symbols

1 ... Cutting machine (Plunge Marnoko)
DESCRIPTION OF SYMBOLS 2 ... Cutting machine main body 3 ... Base 3a ... Guide recessed part, 3b ... Cylindrical wall part, 3c ... Boss part, 3d ... Screw hole, 3e ... Restriction window part 4 ... Electric motor 5 ... Blade case 6 ... Handle part 10 ... Guide apparatus DESCRIPTION OF SYMBOLS 11 ... Guide plate, 11a ... Guide convex part 12 ... Guide part 13 ... Backlash adjustment mechanism 15 ... Screw shaft 16 ... Adjustment knob, 16a ... Inclined surface 17 ... Restriction member (rubber ring)
18 ... Regulating member (C-shaped resin ring)
30 ... Conventional guide device 31 ... Adjusting member 37 ... Fixing screw L ... Guide width (width of guide recess)

Claims (2)

A guiding device for the along the upper surface of the guide plate placed hung on the upper surface of the cutting member by moving the base cutting machine for cutting the cutting member along the cutting direction guide,
The upper surface of the guide plate, with a guide protrusion extending along the cutting direction, on the lower surface of the base, with a guide recess which the guide protrusions provided to open downwardly is fitted, the upper surface of the base to provided, equipped with a backlash adjustment mechanism you restrict rattling between said guide the guide protrusion presses the regulating member with respect to the convex portion and the guide recess,
The rattling adjustment mechanism includes an adjustment screw having a screw shaft and an inclined surface inclined with respect to a tightening direction of the screw shaft, and tightening the screw shaft by rotating the adjustment screw from the upper surface side of the base. A guide device configured to press the restricting member against the guide convex portion through a restricting window portion provided in a wall portion forming the guide concave portion due to the action of the inclined surface accompanying the insertion. 2. The guide device according to claim 1, wherein the inclined surface is provided over the entire circumference of the adjusting screw, an elastic ring is disposed as the regulating member around the inclined surface, and the inclined surface is formed by tightening the adjusting screw. The guide device is configured to expand the diameter of the restricting member against elasticity and press the guide member against the guide convex portion.

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