JP2014004723A - Portable circular saw - Google Patents

Abstract

【Task】
Provided is a portable circular saw that can improve the accuracy of a linear cutting operation.
[Solution]
A mobile phone equipped with a saw blade 7 and having a motor as a drive source in the motor housing, driven by electricity supplied from a power source, and transmitting the rotation of the motor to the saw blade 7 In the circular saw, a flat guide member 8 is provided behind the saw blade 7 so as to be positioned on the same plane as the saw blade 7. The guide member 8 is fixed to the base 6 so as to be slightly movable in the left-right direction, and is arranged so as to protrude downward so as to fit in the cutting groove of the material 3 cut by the saw blade 7. At the time of the cutting operation by the saw blade 7, the guide member 8 is filled with the cutting groove, so that the direction of the saw blade 7 is corrected and the accuracy of the linear cutting operation can be improved.
[Selection] Figure 3

Description

  The present invention relates to a portable circular saw, and more particularly to an improvement in a guide for linear cutting arranged behind a saw blade in the traveling direction.

  A portable circular saw device (hereinafter referred to as “portable circular saw”) is widely used as a tool for cutting a wooden board or the like. In a cutting operation using a portable circular saw, an operator performs the cutting operation while holding the handle portion and moving the portable circular saw forward with respect to the member to be cut. Some portable circular saws are provided with a guide device so that the cutting line (cut surface) is a straight line (plane) with high accuracy. Here, the guide for this straight cutting of the conventional portable round is demonstrated using FIG. 7, FIG. FIG. 7 shows an example of this straight line cutting of a conventional portable circle. The portable circular saw 101 has a saw blade 107, has a motor (not shown) as a drive source built in a motor housing 113, drives the motor by electricity supplied from a power source, and rotates the motor. This is a cutting device that performs a cutting operation by transmitting to the saw blade 107. A separate guide device (guide kumi) 102 is fixed to the portable circular saw 101 as required, and the portable circular saw is brought into contact with the side surface of the material to be cut while the side surface of the guide plate 102a of the guide device 102 is brought into contact with the side surface of the material to be cut. By moving 101 with respect to the member to be cut, linear cutting is performed with high accuracy. When the portable circular saw 101 is used with the guide device 102 removed, the groove provided in the guide piece 104 attached to the front of the portable circular saw 101 is pulled by the material to be cut. A straight line is cut to match the black line.

  FIG. 8 shows a state in which a portable circular saw 201 having no guide device 102 is cut using a straight cutting ruler 205. The straight cutting ruler 205 is a well-known guide device in which a step portion for holding the left end of the base 206 of the portable circular saw 201 is formed. In the cutting operation, the straight line cutting ruler 205 is arranged on the workpiece 103 according to the cutting direction, and the side surface of the base 206 constituting the portable circular saw 201 is brought into contact with the straight line cutting ruler 205 so that the black line 103a. Make a straight line cut to match. At this time, it is necessary to adjust the position of the step portion of the straight cutting ruler 205 so as to match the size of the base 206 of the portable circular saw 201.

  Furthermore, in the technique described in Patent Document 1, a portable circular saw fixed on the lower surface of the base near the rear of the circular saw blade with a guide projection screw that comes into contact with the cut surface of the material cut by the circular saw blade. It has been known.

Japanese Patent Laid-Open No. 3-146301

  According to the configuration of FIG. 7, it is necessary to attach a separate guide device 102 to the main body for linear cutting, and when the guide device 102 is not used, the groove of the guide piece 104 is aligned with the black line. In order to cut, it was necessary to perform the cutting operation while finely adjusting the traveling direction of the portable circular saw 101. Further, according to the conventional example shown in FIG. 8, it is necessary to prepare a separate linear cutting ruler 205 for linear cutting. Further, in the cutting guide device according to Patent Document 1, when the cutting path is warped, the guide is fixed and the state where the cutting path is warped is maintained. Therefore, the cutting operation is temporarily stopped and the cutting position is again set. It was necessary to match.

  The object of the present invention is to improve the above-mentioned problems, improve the accuracy of the linear cutting work without mounting a separate guide, etc., and provided a cutting guide that is easy to use because the cutting path is difficult to warp. It is to provide a portable circular saw.

The characteristics of representative ones of the inventions disclosed in the present application will be described as follows.
According to one aspect of the present invention, a saw blade is provided, a motor serving as a drive source is built in the motor housing, the motor is driven by electricity supplied from a power source, and the rotation of the motor is transmitted to the saw blade. In a portable circular saw that can perform cutting work, a guide member is disposed behind the saw blade and within the range of the bottom surface of the base, and the guide member is used as a cutting groove of the material to be cut. It was comprised so that the direction of a saw blade could be correct | amended by comprising so that it might fill. The guide member is held by an elastic member (for example, a spring) so that it can move slightly in the vertical direction with respect to the rotating surface of the saw blade. It was configured to correct. In addition, the arrangement position can be finely adjusted in the vertical direction of the guide member with respect to the cutting plane. The guide member is held by an elastic member so that it can move slightly in the vertical direction with respect to the rotation surface of the saw blade, so that there is a margin in the vertical direction to correct the advancing direction of the main body during cutting work Configured.

  The accuracy of the linear cutting work can be improved by the guide member provided behind the saw blade. Since this guide member is arranged in the plane of the base, it does not protrude from the front, rear, left and right sides of the base, so that it is possible to realize a portable circular saw having a cutting guide with a clean appearance. In addition, an elastic body is provided at both ends of the installation position adjustment shaft so that there is a margin in the axial direction so that the advancing direction of the main body during the cutting operation can be corrected. A circular saw can be realized.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a top view of the portable circular saw 1 concerning the Example of this invention. It is an expanded sectional view of the A part of FIG. It is sectional drawing seen in the BB direction of FIG. These are the figures which show the position adjustment method of the guide 8 for linear cutting | disconnection by this invention, (1) exists, (2) and (3) rotated the guide shaft 9 and moved the guide 8 slightly. It is a figure which shows a state. It is a figure which shows the positional relationship of the saw blade 7 and the guide 8 at the time of the linear cutting by this invention. It is a figure which shows the positional relationship of the saw blade 7 and the guide 8 when a cutting direction curves to the right by this invention. It is a perspective view which shows the external appearance of the conventional portable circular saw 101 with a cutting guide. In the conventional portable circular saw 201, it is a perspective view which shows the state under cutting | disconnection using the separate type | formula ruler 205 for linear cutting.

  Embodiments of the present invention will be described below with reference to FIGS. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. Further, in this specification, description will be made assuming that the front, rear, left, right, and up and down directions are directions shown in the drawing.

  In the cutting operation using the portable circular saw 1, the cutting is performed by the saw blade 7 that is rotated by a motor while the base 6 is applied to the bottom surface of the workpiece 103. The operator performs the cutting operation while holding the handle portion and moving the portable circular saw forward. However, the cutting surface may be bent if the operator does not move straight forward during the movement. In the present embodiment, the guide device 2 for cutting is placed behind the saw blade 7 attached to the main body, particularly in a circled portion A so as to be in the same plane position as the rotational surface (plane) of the saw blade 7. Provided. The guide device 2 is arranged in the plane of the rectangular base 6 as viewed from above. Here, the guide member described later is positioned behind the rotating saw blade 7 and on the same plane as the surface of rotation of the saw blade 7.

  2 is an enlarged cross-sectional view of a portion A in FIG. The guide device 2 includes a guide (guide member) 8 that is a flat plate member that is thinner than the width of the saw blade 7. The guide 8 has a thickness in the left-right direction, and is fixed so as to extend in a direction perpendicular to the plane (bottom surface) of the base 6. The base 6 is provided with a guide projection hole 6a having a substantially square shape when viewed from above, and is disposed in the vicinity of the left and right center of the guide projection hole 6a. Mounting bases (guide fixing ribs) 13a and 13b are provided so as to protrude from the base 6 in the vertical direction (upward) at the left and right ends of the guide protruding hole 6a. The mounting bases 13a and 13b may be formed integrally with the base 6 by casting or pressing, or may be configured so that separate parts are attached to the base 6.

  The mounting bases 13a and 13b are provided with through holes (not shown). The guide shaft 9 is threaded from the right side of the through holes, and the left side is fixed by the lock nut 11. At this time, the nut 12 is screwed between the mounting bases 13a and 13b so as to penetrate the guide shaft 9, and two guide springs 10a and 10b are disposed between the nut 12 and the mounting base 13b. The guide 8 is sandwiched between the two guide springs 10a and 10b. In this way, the left and right of the traveling direction of the portable circular saw 1 are projected by the two planes of the saw blade 7 and the guide 8 by projecting downward from the guide projecting hole 6a and being fitted in the cutting groove 3a of the material 3 to be cut. Since blurring is regulated, the accuracy of linear cutting can be greatly improved. If the nut 12 cannot be rotated relative to the mounting base 13a so that one side surface of the nut 12 is in contact with the mounting base 13a, the guide shaft 9 is rotated to move the holding position of the guide 8 to the left. Alternatively, it can be moved slightly to the right, and the guide shaft 9 can have a function as an adjusting means.

  FIG. 3 is a cross-sectional view seen in the BB direction of FIG. From this figure, the shape of the guide 8 can be understood. The guide 8 is a plate material on a plane close to a rectangle, and is provided with a through hole, and the guide shaft 9 is passed through the through hole. The guide 8 is configured to slightly protrude below the lower end (lower surface) of the base 6. Further, the length of the guide 8 in the front-rear direction is preferably configured to have a certain length in order to provide a function as a guide when the portable saw blade is linearly cut. Further, it is preferable that the angle on the front edge side is slightly inclined to the rear side and the corner portion is formed to be slightly round so that the guide 8 does not bite into the cut surface of the material to be cut 103 and hinder the cutting work. The length H protruding downward is not so necessary.

  Next, a method for adjusting the guide position of the guide device 2 will be described with reference to FIG. During the cutting operation, a nut 12 is screwed into the threaded guide shaft 9, and two guide springs 10 a and 10 b are disposed between the nut 12 and the mounting base 13 b of the base 6. The guide 8 is held between the guide springs 10a and 10b. Further, since the flat side surface of the nut 12 is in contact with the mounting base 13 a of the base 6, the nut 12 slides in the axial direction (left-right direction) of the guide shaft 9 by the rotation of the guide shaft 9. Can be finely adjusted. FIG. 4A is a diagram illustrating a state in which the guide 8 is located at the center of the left and right. Here, the guide springs 10a and 10b have the same compression coil spring, that is, the same shape and the same elastic modulus. Therefore, when no external force is applied to the guide 8 from the outside, the guide 8 is positioned at the center of the mounting base 13 b and the nut 12.

  FIG. 4B shows a state where the guide shaft 9 is rotated clockwise and the nut 12 is moved in the direction of the arrow 21. At this time, when the position of the nut 12 is shifted, the center position of the mounting base 13 b and the nut 12 is also moved, so that the guide 8 is slightly moved to the right side as indicated by an arrow 22. FIG. 4B shows a state where the guide shaft 9 is turned counterclockwise and the nut 12 is moved in the direction of the arrow 31. At this time, when the position of the nut 12 is shifted to the left side, the guide springs 10a and 10b are compressed and the center position of the mounting base 13b and the nut 12 is also moved, so that the guide 8 slightly moves to the left side as indicated by an arrow 32. . Since the guide 8 is thus held by elastic members such as springs arranged on the left and right sides, the parallelism with the saw blade 7 can be finely adjusted, and the position of the base 6 can be adjusted. Even when the relative position of the saw blade 7 changes, the guide 8 can be moved in the same plane as the saw blade 7.

  Next, the operation of the guide 8 at the time of linear cutting will be described with reference to FIGS. According to the present embodiment, the guide spring length C on the left side of the guide 8 and the guide spring length D on the right side of the guide 8 are the same length at the time of straight line cutting. There is no load. However, as shown in FIG. 6, when the cutting path turns to the right and the inclination angle becomes θ, a force that moves the cutting material to the right side from the cutting surface of the material to be cut is applied to the right side. Since the guide spring length D is shorter than the left guide spring length C, a force Fr that pushes rightward acts on the rear side of the main body when viewed with reference to the guide 8 fitted in the cutting groove 3a. Here, by setting the spring constant of the guide springs 10a and 10b to 0.5 to 2 kg / mm, it is about the same as the load applied by the operator in the side surface direction of the main body when correcting the cutting path in the conventional circular saw. The force Fr can be obtained. As a result, when the rear of the main body is pressed rightward, the plane constituted by the saw blade 7 and the guide 8 can be easily returned to the conventional cutting plane, so that linear cutting can be easily performed.

  In this case, if the spring constants of the guide springs 10a and 10b are too small, it is not possible to obtain a lateral load sufficient to correct the course by the frictional resistance generated between the portable circular saw 1 and the material 3 to be cut. On the other hand, if the spring constant is too large, the side surface of the guide plate 2a and the material 3 to be cut are stretched when the cutting path is shifted, and the load is likely to increase. Therefore, it is important to carefully consider these points and select the mounting position and size of the guide 8 and the guide springs 10a and 10b.

  As described above, according to the present embodiment, by providing the guide 8 on the same plane as the saw blade 7 behind the saw blade 7 of the portable circular saw 1, Since the traveling direction of the portable circular saw 1 is regulated by the two surfaces of the saw blade 7 plane and the guide 8 plane, the linear cutting accuracy can be improved. Further, the guide shaft 9 is threaded, and the flat side surface of the nut 12 screwed into the screw is in contact with the mounting base 13a of the base 6, so that the guide shaft 9 is rotated. Since the nut 12 moves in the axial direction of the guide shaft 9, the position of the guide 8 can be arbitrarily finely adjusted, and planar alignment with the saw blade 7 is possible. Furthermore, even if the cutting path is misplaced, the guide 8 is semi-forcedly held by the guide springs 10a and 10b, so that the cutting path can be corrected.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, although the compression spring is used as the elastic member for holding the left and right sides of the guide 8, it may be configured to be held not only by the compression spring but also by other spring means or a member having elasticity.

1 Portable circular saw 2 Guide device (guide kumi)
3a Cutting groove 6 Base 6a Guide projection hole 7 Saw blade 8 Guide 9 Guide shaft 10a, 10b Guide spring 11 Lock nut 12 Nut 13a, 13b Fixing rib 101 Portable circular saw 102 Guide device (guide kumi)
102a guide plate 103 material to be cut 103a black line 104 guide piece 107 saw blade 113 motor housing 201 portable circular saw 205 linear cutting ruler 206 base C left guide spring length D right guide spring length Fr guide spring pressing force

Claims (4)

A saw blade, a flat base that stabilizes the position of the saw blade by being placed on a material to be cut, and a motor that rotates the saw blade. In a portable circular saw that performs cutting work by transmitting the rotation of the motor to the saw blade,
A flat plate-shaped guide member is arranged behind the saw blade and on the same plane as the rotation surface of the saw blade,
The guide is configured to fit in a cutting groove of a material to be cut cut by the saw blade,
A portable circular saw, wherein the direction of the saw blade is corrected by the guide during the cutting operation by the saw blade. A guide projection hole for arranging the guide is formed in the base,
The portable circular saw according to claim 1, wherein the guide member is fixed to the base so as to protrude downward from the guide protrusion hole.   The guide member is held by an elastic member so as to be slightly movable in a vertical direction with respect to a rotation surface of the saw blade, and an adjusting means for adjusting a vertical position is provided. Item 3. A portable circular saw according to item 2. The portable circular saw according to claim 3, wherein the thickness of the guide member is equal to or slightly smaller than the thickness of the circle.

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