JP2006335033A - Electromotive cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromotive cutter having good workability capable of easily and precisely performing work which performs the cutting parallel to a floor surface. <P>SOLUTION: The electromotive cutter has an electromotor, a main body 10 having a dynamo built therein, the edge tool 20 rotationally driven by the electromotor, a saw cover 30 for covering at least a part of the edge tool 20, a base 40 having the bottom surface 40a connected to the saw cover 30 and capable of being slid on a material to be cut and a shaking shaft 50 almost parallel to the rotary shaft of the edge tool 20 and is constituted so that the main body 10 can be shaken centering around the shaking shaft 50 with respect to the base 40 and the edge tool 20 can be protruded from the surface 40a of the base. A support surface part having the surface almost crossing the shaking shaft 50 at a right angle is provided to the surface on the side opposite to the main body of the saw cover 30 and another constituent region is arranged on the side of the main body 10 of the support surface part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric cutting machine having a blade that is rotationally driven by an electric motor, a saw cover that covers a part of the blade, and a base that is connected to the saw cover and has a bottom surface that can slide on a workpiece. is there.

An example of a conventional electric cutting machine will be described with reference to FIGS. 16 to 18 taking a circular saw as an example.
As an electric cutting machine capable of performing cutting while sliding on a workpiece, a circular saw having a shape as shown in FIG. 16 is the most common.
The circular saw shown in FIG. 16 has a saw blade 20 that is rotationally driven by an electric motor (not shown), a saw cover 30 that covers a part of the saw blade 20, and a bottom surface 40a that can slide on a material to be cut. The base 40 is sometimes configured to stabilize the work.

The situation when the circular saw having the above-described shape is used, for example, at the time of replacing the floor of a house will be described below.
As shown in FIG. 17, the structure around the floor of a general Japanese house has a plurality of joists 60 at the bottom and a base 61 that is slightly thicker at the end, and on the base 61, A plurality of pillars 62 are erected in the depth direction in the figure. On the joist 60, a base 63 is placed so as to abut against the pillar 62, and a floor board material 64 is placed thereon. A board 65 serving as a base of the wall is attached to the plurality of pillars 62, and a baseboard 67 is bonded to the board 65 as a blindfold of the gap 66 at the boundary between the board 65 and the floor board material 64. Wallpaper 68 is pasted on the surface of the board 65 as a decoration.
When the floor is replaced, it is necessary to first cut the floor board material 64 at a position 69 along the edge of the baseboard 67 and peel it off from the base 63.

However, in the circular saw of the type shown in FIG. 16 described above, the flange bolts 29 for fixing the base 40 and the saw blade 20 are obstructive, and the actual cutting position 70 is a position 69 near the baseboard 67. Therefore, it was impossible to perform cutting at a position 69 near the baseboard 67.
In order to solve this problem, as shown in FIG. 18, the lower end portion of the saw blade 20 is tilted in the direction of swinging toward the wall side, and the base 40 side surface 40b is moved in contact with the baseboard 67 in this tilted state. Thus, a circular saw (cutting circular saw) has been devised that enables the cutting of the floor plate material 64 at the edge of the wall. (For example, refer to Patent Documents 1 to 3.)

  Specifically, after the baseboard 67 is cut by the above method and the floor board material 64 is peeled off, the baseboard 67 and the floor board material uncut portion 71 are also removed, and the base 63 is exposed completely. A new flooring is installed, and the new baseboard is bonded to the board 65 as a blindfold of the gap 66 again. At this time, the new baseboard is often wider than the old baseboard so that the portion of the board 65 where the wallpaper 68 is not attached is not visible.

  However, in actual work, when the baseboard 67 is peeled off with a bar or the like, there is a high possibility that the wallpaper 68 affixed to the board 65 will be damaged, and if it is damaged, the wallpaper 68 is eventually replaced. There may be a need.

For this reason, when there is a limit in time and budget, there is a case where a new floor board material is attached without peeling off the baseboard 67.
In this method, as shown in FIG. 19, the existing floor board material 64 is left as it is, a notch 73 parallel to the floor board material 64 is made in the base board 67, the lower end portion of the base board 67 is removed, and the floor board material 64 and the residual material are left. A new floor board material 72 is inserted into a space 74 formed between the baseboard 67 and the baseboard 67.

Japanese Patent No. 2933196 JP 2001-315101 A JP 2003-71803 A

  In the above-described conventional electric cutting machine, for example, when a new floor board material is laid again on the old floor board material, in order to provide a new floor board material insertion space at the lower end of the baseboard 67, a cut parallel to the floor surface 64 is made. When a cutting operation parallel to the floor surface 64 is performed as in the case of insertion, etc., when a circular saw as shown in FIG. 17 is to be cut while sliding the base side surface 40b on the floor surface 64, the base side surface 40b is not formed assuming such a use form, and it is difficult to perform the cutting operation while stabilizing the circular saw body so that the side surface of the saw blade 20 is parallel to the floor surface 64. It was impossible to perform good cutting work.

  An object of the present invention is to provide an electric cutting machine with good workability capable of solving the above-described problems and easily and accurately performing cutting parallel to the floor surface.

The above object can be achieved by providing a support portion having a surface substantially orthogonal to the swing axis on the side surface opposite to the main body of the saw cover, and disposing other components on the main body side than the surface of the support portion. it can.
Alternatively, a support portion having a surface substantially orthogonal to the swing axis is provided on the opposite side surface of the saw cover body, and a cutting operation performed while the base bottom surface is slid on the material to be cut, and a workpiece positioned near the material to be cut. This can be achieved by making it possible to perform a cutting operation while sliding the support portion on a floor surface or the like installed at an angle different from that of the cutting material.

  According to the invention described in claim 1 or claim 14, when the cutting work parallel to the floor surface is performed on the material to be cut, if the support portion provided on the saw cover is placed on the floor surface, Thus, the cutting operation can be performed easily and accurately while the main body is stabilized.

  According to the second aspect of the present invention, since the support portion is provided integrally with the saw cover, the function and effect of the first aspect of the present invention can be achieved without causing an increase in the number of parts and a deterioration in assemblability. An electric cutting machine that can be played can be provided at low cost. In addition, since the number of parts is not increased, it is possible to suppress a decrease in accuracy due to an increase in dimensional errors.

  According to the invention described in claim 3, since the support portion is constituted by a plurality of protrusions provided on the saw cover, it can be used for other functions, for example, the rotation direction of the blade is represented by the protrusions. . In addition, for example, in the case where the saw cover is provided with a discharge port having a circular cross section that allows connection of a hose connected to the dust collector, only a plurality of protrusions are protruded on the side opposite to the main body from the discharge port. If it is set as a structure, the enlargement of a saw cover and by extension, the whole product can be suppressed. Moreover, the fall of the dust collection rate by the area inside a saw cover becoming large can be suppressed.

  According to the invention described in claim 4, when the support portion is arranged so as to sandwich the rotating shaft of the blade along the cutting direction, the cutting work parallel to the floor surface is performed over a wide range on the workpiece. In this case, it is necessary to perform the cutting operation while sliding the support portion on the floor surface. At this time, it is possible to maintain a stable state and perform a cutting operation with high accuracy.

  According to the invention described in claim 5, since the cutter can be retracted to a position where it does not protrude from the bottom surface of the base, the support portion is brought into contact with the floor surface or the like before starting cutting, and the base bottom surface is used as a material to be cut. After abutment and stabilization of the electric cutting machine main body, the cutting operation can be started by swinging the main body with respect to the base. A situation where an unintended part is damaged can be suppressed.

  According to the sixth aspect of the present invention, by providing the saw cover so as not to move in the swinging direction of the main body with respect to the base, the support portion is brought into contact with the floor surface or the like and the bottom surface of the base is covered before the start of cutting. After the electric cutting machine main body is stabilized by abutting against the cutting material, when the cutting operation is performed by swinging the main body with respect to the base, the saw cover does not move during the swinging, so that a more stable cutting operation can be performed. .

  According to the seventh aspect of the present invention, the side surface of the base and the side surface of the blade are inclined so that the blade can protrude from the vicinity of the intersection where the virtual surface including the bottom surface of the base intersects the virtual surface including the side surface of the base. Accordingly, the operational effect of the invention according to claim 1 can be obtained, and if the base bottom surface is placed on the material to be cut, a cutting operation generally called cutting as shown in FIG. 18 can be performed. The electric cutting machine which can be provided can be provided.

  According to the eighth aspect of the present invention, the fixed position of the cutter in the direction of the rotation axis in the saw cover can be adjusted, so that when the support portion is placed on the floor surface and the workpiece is cut, The distance of the cutting point from the surface can be adjusted, and the cutting position 73 can be adjusted in accordance with the thickness dimension of the new flooring 72 when performing the operation shown in FIG. Moreover, the adjustment at the time of making a cutter protrude from the intersection vicinity like the invention of Claim 7 can be performed.

  According to the ninth aspect of the present invention, the main body has the spindle that is rotated by driving of the electric motor, is provided so as to be integrally rotatable with the spindle, and is located on the electric motor side with respect to the blade, and the first washer. A second washer having a female screw portion that can be screwed with a male screw portion formed on the outer periphery of the washer, and a female screw portion that can be screwed with a male screw portion formed on the outer periphery of the spindle, and an anti-electric motor for the blade The second washer is fixed on the spindle by the second washer and the third washer so that the second washer can be rotated before the cutter is fixed. If you adjust the position of the tool, you can adjust the fixed position of the tool, and there is no need to prepare multiple washers with different thicknesses to adjust the fixed position of the tool. Both the distance of the saw blade from the surface of the support portion can be finely adjusted.

  According to the tenth aspect of the present invention, the urging means is provided to urge the main body and the base to move away from each other with the rocking shaft as a fulcrum, and the main body and the base swing in the most separated direction. By providing rocking regulation means that regulates rocking so that the blade does not come into contact with the inner wall of the saw cover in the state, before starting cutting, the support part is brought into contact with the floor surface and the base bottom surface is to be cut After the electric cutting machine body is brought into a stable state by being brought into contact with the main body, it is possible to improve workability when the body is rocked with respect to the base to perform cutting. That is, since the main body is always urged to swing in the direction away from the base, the pressing force applied to the main body when the base bottom surface is cut while sliding on the workpiece is unstable. In addition, it is possible to maintain the state in which the bottom surface of the base is in contact with the material to be cut stably by the urging force of the urging means. Further, as in the fifth aspect of the invention, if the cutter is prevented from projecting from the base bottom surface while the main body and the base are swung in the most separated direction, the base bottom surface is brought into contact with the material to be cut, and thereafter Even if the base bottom is brought into contact with the material to be cut when the main body is pressed and cut, the blade will not protrude from the base bottom unless the pressing force that overcomes the biasing force of the biasing means is applied. It is possible to suppress cutting, and work can be completed immediately by releasing the pressing force applied to the main unit without stopping the motor at the end of work. Can be improved.

  According to the invention of claim 11, the swing restricting means has a lock lever that is rotatably provided on the saw cover or the main body, and a hook that is provided on the main body or the saw cover and can be engaged with the lock lever. The lock lever and the hook are engaged to restrict the main body from swinging in the direction approaching the base, and the restricted state can be released by rotating the lock lever in the restricted state. Thus, in addition to the function and effect of the invention of claim 10, even if a pressing force in a swinging direction so that the main body comes close to the base is unexpectedly applied to the main body before starting work, the material to be cut, etc. Can be prevented from being damaged.

  According to the twelfth aspect of the present invention, the main body includes an arm having one end rotatably connected to the swinging shaft of the saw cover, a housing non-rotatably connected to the arm, and an electric motor. By providing an electric grinder having a grip portion having a shape extending in the direction, an electric cutting machine capable of achieving the effects of the invention of claim 1 is provided at low cost by using the electric grinder as a grinding / polishing tool. can do.

  According to a thirteenth aspect of the invention, the saw cover is provided with a rail having a wall surface extending perpendicularly to the swing shaft and having a substantially arc shape with the swing shaft as a fulcrum, and the rail wall surface is slid on the main body. Since the movable sliding portion is provided, the position of the main body with respect to the saw cover can be supported by the swing shaft, the rail, and the sliding portion, and the position of the main body with respect to the saw cover can be stabilized. In the case of a structure that supports the main body only in the vicinity of the rocking shaft, it is necessary to devise such as forming the rocking shaft, arm and other members with high-strength parts so that there is no backlash. By doing so, an inexpensive and accurate electric cutting machine can be provided.

An embodiment of an electric cutting machine according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electric cutting machine of the present invention covers at least a part of the saw blade 20, a main body 10 incorporating an electric motor (not shown), a saw blade 20 that is a blade of the present invention that is rotationally driven by the electric motor, and the saw blade 20. A saw cover 30, a base 40 having a bottom surface 40 a connected to the saw cover 30 and capable of sliding on the material to be cut, and a swing shaft 50 substantially parallel to the rotation axis of the saw blade 20, The main body 10 can swing with respect to the base 40 as a fulcrum, and the saw blade 20 can protrude from the base 40 bottom surface 40a.

  The main body 10 has a cylindrical shape, a motor (not shown) built in, and a grip portion 11 that extends in the direction of the rotation axis of the motor. The grip portion 11 is designed to have a size that can be gripped by a hand, and the work is performed by gripping the grip portion 11 during the work.

  Further, as shown in FIG. 10, the main body 10 includes a spindle 12 that is rotationally driven by an electric motor (not shown), a gear housing 13 that covers a gear portion between the electric motor and the spindle 12, and an arm that is non-rotatably attached to the gear housing 13. 14 and a sliding portion 15 provided at the end of the arm 14 on the gripping portion 11 side. Although not shown, the main body 10 is provided with a start switch for controlling the driving of the electric motor and a power cord connected to a commercial power source (not a power cord but a battery as a driving source, and the battery is attached / detached). Possible configuration).

  The spindle 12 extends in a direction substantially orthogonal to an output shaft of an electric motor (not shown), and is provided with a two-sided width portion 12a at a portion protruding from the gear housing 13 and a male screw portion 12b at the tip. Has a configuration.

  The arm 14 includes a swing shaft mounting portion 14a for mounting a swing shaft 50, which will be described later, in the lower right portion of FIG. 10, a spindle support portion 14b having a circular shape for rotatably supporting the spindle 12 in the center portion, a gear housing 13, and the like. Spindle support from the abutting flange portion 14c, a plurality of screw through holes 14d through which a plurality of screws 13a (four in this embodiment) screwed into the gear housing 13 provided in the flange portion 14c pass, and the swing shaft attaching portion 14a A first arm portion 14e extending toward the portion 14b, and a second arm 14f extending from the spindle support portion 14b toward the anti-oscillation shaft mounting portion 14a and extending substantially parallel to the first arm portion 14e. ing. Since the arm 14 is fixed to the gear housing 13 by the screw 13a via the flange portion 14c as described above, the arm 14 is fixed to the gear housing 13 and the grip portion 11 so as not to rotate. Further, a swing shaft 50 described later is inserted into the swing shaft mounting portion 14a of the arm 14, and a coil spring 51 which is an urging means of the present invention disposed on the outer periphery of the swing shaft 50 is inserted.

  A sliding portion 15 formed integrally with the arm 14 is provided at the tip of the second arm portion 14f of the arm 14, and the sliding portion 15 includes two rotatable metals 15a, 15b, A bolt 15c that passes through the sliding portion 15 and protrudes downward in FIG. 10 and a rotation-preventing member that is arranged in a direction substantially perpendicular to the axis of the bolt 15c and that can be abutted on the bolt 15c. A bolt 15d is provided. The bolt 15c can adjust the amount of protrusion downward, and can abut on a contact portion 31l of a saw cover 30 described later.

  Further, on the first arm portion 14 e of the arm 14, a hook 14 g that can be engaged with an engaging portion 33 a of a lock lever 33 attached to a saw cover 30 described later is arranged in a direction substantially orthogonal to the axial direction of the swing shaft 50. Standing up.

  The main body 10 is configured by attaching an arm 14 and a sliding portion 15 to an electric grinder shown in FIG. 11, and a rotation support portion 13b for rotating and supporting the spindle 12 is removed from the gear housing 13, and a rotation support portion 13b is obtained. Instead of this, the arm 14 is attached to the gear housing 13.

  The saw blade 20 which is the cutter of the present invention is fixed on the spindle 12 described above, and the fixing structure of the saw blade 20 will be described in detail.

  As shown in FIGS. 5 and 6, a first washer 21, a second washer 22, and a third washer 23 are provided on the spindle 12, and the saw blade 20 is interposed between the second washer 22 and the third washer 23. It is arranged.

  The first washer 21 has a two-sided width inner shape part 21a substantially the same shape as the two-sided width part 12a of the spindle 12, and in the state shown in FIGS. 5 and 6, the two-sided width part 12a and the two-sided width part The inner washer 21 a is engaged, and the first washer 21 cannot be rotated on the spindle 12, that is, the first washer 21 is provided so as to be integrally rotatable with the spindle 12. Further, a male screw portion 21b is provided on a part of the outer periphery of the first washer 21, and a flange portion 21c protruding outward in the radial direction is provided at a position on the main body 10 side of the male screw portion 21b. Further, the outer peripheral portion of the first washer 21 where the male screw portion 21 b is not provided is formed to have substantially the same diameter as the inner peripheral portion of the saw blade 20.

  On the outer periphery of the first washer 21, a second washer 22 having a female screw portion 22a that can be screwed with the male screw portion 21b is provided. In the second washer 22, the male screw portion 21b and the female screw portion 22a are screwed together, so that the second washer 22 rotates relative to the first washer 21, whereby the rotation direction of the spindle 12, that is, the saw blade 20 is obtained. It can move in the direction of the rotation axis.

  The third washer 23 has a shape having a female screw part 23 a that can be screwed with the male screw part 12 b of the spindle 12, and the third washer 23 rotates with respect to the first washer 21, thereby rotating the spindle 12 in the rotation axis direction. That is, the saw blade 20 can move in the rotation axis direction.

  A saw blade 20 is disposed between the second washer 22 and the third washer 23 on the outer periphery of the first washer 21, the third washer 23 is rotated with respect to the spindle 12, and the third washer 23 is turned into a saw blade. By moving to the side 20, the saw blade 20 can be clamped and fixed on the spindle 12 by the second washer 22 and the third washer 23 as shown in FIGS.

  In a state where the saw blade 20 is sandwiched and fixed, the screw portions of the second washer 22 and the first washer 21 are not loosened so that the second washer 22 and the third washer 23 are not rotated and loosened when the saw blade 20 is rotated. The shape is formed so that the second washer 22 approaches the saw blade 20 as the saw blade 20 rotates, and the third washer 23 and the threaded portion of the spindle 12 are shaped so that the third washer 23 is the saw blade. It is formed in a direction approaching the saw blade 20 as it advances in the direction of rotation 20.

  Before clamping and fixing the saw blade 20, the second washer 22 is rotated with respect to the first washer 21, and the second washer 22 is moved to an arbitrary position, whereby the saw blade 20 is clamped in the axial direction of the spindle 12. The position can be adjusted.

  The flange portion 21c of the first washer 21 abuts against the second washer 22, thereby restricting the movement of the second washer 22 toward the main body 10 and the movement of the anti-main body 10 side with the saw blade 20. When a predetermined position is passed, the male screw portion 21b and the female screw portion 22a are unscrewed so that the screw does not contact the inner wall of the saw cover 30 or the saw blade 20 cannot be attached.

  The base 40 is formed by processing an iron plate material, and has a bottom surface 40a that can slide on the material to be cut, a side surface 40b that is substantially orthogonal to the bottom surface 40a, and an opening 40c between the bottom surface 40a and the side surface 40b. I am doing. The opening 40c has a shape extending in the longitudinal direction of the base 40 rather than the diameter of the saw blade 20 having the largest diameter that can be attached, and the saw blade 20 has a bottom surface as shown in FIGS. 5 and 6 through the opening 40c. It is configured to be able to protrude downward from 40a. As shown in FIG. 5, the opening 40 c has an L-shaped cross section that opens to the rotating shaft side (upward in the drawing) of the saw blade 20 from the bottom surface 40 a and opens from the side 40 b to the main body 10 (right side in the drawing). I am doing.

  As shown in FIG. 9 in particular, the saw cover 30 includes a main body side cover portion 31 located on the main body 10 side, an anti-main body side cover portion 32, and a lock lever 33 attached to the main body side cover portion 31. Yes.

  The main body side cover portion 31 has two attachment portions 31a having lower ends that can come into contact with the upper surface of the base 40. The boss portion 40d of the base 40 can be accommodated inside the attachment portion 31a, and the boss portion 40d. A first screw hole 31b and a second screw hole 31c into which a screw 40f penetrating a long hole 40e provided in the screw can be screwed are provided in the respective attachment portions 31a. As shown in FIG. 13, the first screw hole 31 b and the second screw hole 31 c have a relationship in which the axial direction is inclined, and the second screw hole 31 c is a direction orthogonal to the axial direction of the swing shaft 50. The first screw hole 31 b extends at a predetermined angle with respect to the axial direction of the swing shaft 50.

  The relationship between the saw cover 30 and the base 40 shown in FIGS. 1 to 8 and 12 is that the screw 40f is screwed into the first screw hole 31b and the main body side cover 31 is fixed to the base 40, and the relationship shown in FIG. The screw 40f is screwed into the second screw hole 31c, and the main body side cover 31 is fixed to the base 40.

  As shown in FIG. 7, the attachment part 31a of the main body side cover part 31 is arranged so as to be spaced apart in the cutting direction of the electric cutting machine (the direction from the left to the right in FIG. 1). A lower end 31d having a lower end substantially parallel to the lower end 31d is provided, and the lower end 31d is in contact with the upper surface of the base 40 as shown in FIGS.

  As described above, when the attachment portion 31a and the lower end portion 31d are in contact with the upper surface of the base 40, the body-side cover 31 is inclined with respect to the bottom surface 40a of the base 40 as shown in FIG. As a result, the main body side cover 31 can endure a load that works to tilt the body side cover 31 more.

  A support portion 31e that rotatably supports the swing shaft 50 is provided at the front end in the cutting direction of the main body side cover 31 (on the right side in FIG. 1). The support portion 31e and the swing shaft of the arm 14 described above are provided in the support portion 31e. In the space defined by the mounting portion 14a, the swing shaft 50 and a coil spring 51 which is an urging means of the present invention provided on the outer periphery of the swing shaft 50 are inserted, and the arm 14 uses the swing shaft 50 as a fulcrum. It can swing. That is, the main body 10 can swing with respect to the saw cover 30 and the base 40 with the swing shaft 50 as a fulcrum via the arm 14. Note that a screw portion (not shown) is formed at the tip of the swing shaft 50 and the swing shaft mounting portion 14a of the arm 14. For example, an adhesive is applied between the screw portions to the swing shaft mounting portion 14a. Thus, the oscillating shaft 50 is devised so as not to rotate.

  One end of the coil spring 51 is in contact with a part of the main body side cover portion 31, and the other end is in contact with a part of the arm 14, and the coil spring 51 uses the swing shaft 50 as a fulcrum to support the rear end of the arm 14 in the cutting direction. (Left side in FIG. 1) is biased so as to move away from the base 40, that is, the main body 10 swings in a direction away from the base 40.

  The wall portion 31f of the main body side cover portion 31 has a shape extending so as to be substantially orthogonal to the axial direction of the swing shaft 50, and the swing shaft 50 serves as a fulcrum at a substantially central portion of the wall portion 31f. An arc-shaped hole 31g having a substantially arc shape is provided.

  5 and 6, the spindle 12 is disposed so as to pass through the arc-shaped hole 31g, and when the main body 10 swings around the swing shaft 50 as a fulcrum, the spindle 12 contacts the inner wall of the arc-shaped hole 31g. It is formed so as not to contact. The arc-shaped hole 31g is formed in a minimum necessary space where the spindle 12 does not contact so that dust or the like generated during the cutting operation and flowing into the saw cover 30 is not scattered outside through the arc-shaped hole 31g. Yes.

  The wall portion 31f of the main body side cover portion 31 is provided with a lock lever attachment portion 31h and a rotation restricting portion 31i that protrude toward the main body 10 side. The lock lever 33 is attached to the lock lever attachment portion 31h so as to be rotatable on the lock lever attachment portion 31h. Note that the protruding direction of the lock lever mounting portion 31 h and the rotation axis of the lock lever 33 are substantially parallel to the axial direction of the swing shaft 50.

  The lock lever 33 is attached to the saw cover 30 by a screw 33d with a coil spring 33c interposed between the wall portion 31f and the lock lever 33.

  The lock lever 33 has a substantially L-shape having an engagement portion 33a at one end and an operation portion 33b at the other end, and the operation portion 33b is connected to the wall portion 31f by a coil spring 33c as shown in FIG. It is urged to abut against the provided rotation restricting portion 31i.

  The engaging portion 33a of the lock lever 33 and the hook 14g provided on the arm 14 are engaged in a state in which the main body 10 and the base 40 are swung in the most separated direction by the urging force of the coil spring 51 as urging means. It acts to restrict the main body 10 from swinging toward the saw cover 30 and the base 40 when engaged. As shown in FIG. 3, from the swing restriction state in which the engaging portion 33a and the hook 14g are engaged, the operating portion 33b of the lock lever 33 is rotated toward the base 40 against the biasing force of the coil spring 33c. By releasing the engagement between the engaging portion 33a and the hook 14g, the swing restriction state can be canceled, and the main body 10 can be swung in the direction approaching the base 40.

  The coil spring 51 which is the urging means of the present invention urges the main body 10 to swing away from the base 40 as described above. This urging force is applied to the bottom surface of the base 40. The main body 10 is designed not to swing downward due to gravity while the 40a is placed on the floor or the like. In a state where no pressing force is applied to the main body 10 to swing downward, The main body 10 is positioned upward (in the direction in which the main body 10 is separated from the base 40) by the urging force of the coil spring 51. As a result, the engaging portion 33a of the lock lever 33 and the hook 14g of the arm 14 are engaged.

  When the main body 10 swings upward by the urging force of the coil spring 51, the hook 14g comes into contact with the engaging portion 33a of the lock lever 33 that is in contact with the rotation restricting portion 31i, so Since the surface is inclined, the hook 14g slightly rotates the lock lever 33 in a direction against the urging force of the coil spring 31g, and then the engaging portion 33a and the hook 14g are engaged.

  Further, the main body side cover portion 31 is provided with a substantially semicircular discharge portion 31j. The discharge portion 31j forms a discharge port 34 together with a discharge portion 32f of the non-main body side cover portion 32 to be described later. The outlet 34 is formed along the inner wall of the saw cover 30 and extends tangentially from a part of the outer periphery of the saw blade 20 so that the chips generated during the cutting operation and discharged into the saw cover 30 can be easily discharged to the outside of the saw cover 30. It has a different shape. The discharge port 34 can be connected to one end of a hose or a dust collection bag connected to the dust collector.

  Further, the main body side cover portion 31 is provided with a rail 31k, a lower abutting portion 31l, and an upper protruding portion 31m. The rail 31k has a pair of wall surfaces substantially orthogonal to the axial direction of the swing shaft 50, and is formed in a substantially arc shape with the swing shaft 50 as a fulcrum. The thickness dimension of the rail 31k in the direction perpendicular to the axial direction of the swing shaft 50 is substantially the same over the entire region, and the metals 15a and 15b provided on the sliding portion 15 of the arm 14 described above are formed. It arrange | positions so that the rail 31k may be pinched | interposed, and the metal 15a, 15b slides on the rail 31k when the main body 10 rocks.

  As described above, when the main body 10 swings, the sliding portion 15 of the arm 14 slides on the rail 31k, so that the main body 10 has two points of the swing shaft 50 and the rail 31k with respect to the saw cover 30. Thus, the position of the main body 10 with respect to the saw cover 30 is supported by the swing shaft 50, the rail 31k, and the sliding portion 15, and the position of the main body 10 with respect to the saw cover 30 can be stabilized. As a result, the parallelism between the side surface of the saw blade 20 and the side surface 40b of the base 40 can be maintained. For example, when the main body 10 is connected to the saw cover 50 only in the vicinity of the swing shaft 50, the arm 14 is deformed, and there is a backlash between the swing shaft 50 and the arm 14, so that the parallelism is achieved. If the arm 14 is formed of high-strength parts so that deformation or the like does not occur, the weight of the entire product increases and the cost increases. As described above, the rail 31k Further, by providing the sliding portion 15 that can slide on the rail 31k, the parallelism between the side surface of the saw blade 20 and the side surface 40b of the base 40 can be maintained at a low cost without increasing the weight. A possible configuration can be provided.

  Below the rail 31k, that is, at a position on the base 40 side, a downward projecting portion 31l projecting in a direction away from the saw blade 20 and projecting to the main body 10 side is formed. The lower end of the bolt 15c of the sliding portion 15 can come into contact with the projecting portion 31l. The lower end of the bolt 15c contacts the projecting portion 31l, so that the main body 10 swings in a direction closer to the base 40. The range of movement is regulated. The bolt 15c is screwed to the sliding portion 15, and it is possible to adjust the protruding amount of the bolt 15c with respect to the sliding portion 15, that is, the protruding amount of the bolt 15c with respect to the arm 14, but this protruding amount is adjusted. Thus, the range of regulation of the downward swing of the main body 10 can be adjusted, and the protruding amount of the saw blade 20 from the base 40 bottom surface 40a, that is, the cutting amount can be adjusted.

  An upper protrusion 31m protruding outward from the rail 31k is provided above the rail 31k, that is, at a position away from the base 40. The upper protrusion 31m has a sliding portion as shown in FIGS. 15 It is comprised so that upper direction may contact | abut. A range in which the sliding portion 15, that is, the main body 10 swings upward by the urging force of the coil spring 51 is restricted by the sliding portion 15 coming into contact with the upper protruding portion 31, and the upper protruding portion 31 m is the present invention. The swing restricting means is configured. Further, when the upward swing of the main body 10 is restricted by the swing restricting means, the saw blade 20 does not protrude from the bottom surface 40a of the base 40, and the saw blade 20 does not contact the inner wall of the saw cover 30 and is circular. The spindle 12 is configured not to contact the inner wall of the arc-shaped hole 31g.

  As described above, the urging means for urging the main body 10 to oscillate upward is provided, and the oscillating restriction means for regulating the oscillating upward of the main body 10 so that the saw blade 20 does not contact the inner wall of the saw cover 30. With this configuration, the base 10 is swung with respect to the base 40 after the bottom surface 40a of the base 40 is brought into contact with the material to be cut and the electric cutting machine main body is stabilized before starting cutting. Therefore, it is possible to perform cutting work and improve workability. That is, since the main body 10 is always urged to swing in a direction away from the base, the pressing force applied to the main body 10 when cutting while sliding the bottom surface 40a of the base 40 on the workpiece is not sufficient. Even if it becomes stable, it is possible to maintain the state in which the bottom surface 40a of the base 40 is brought into contact with the material to be cut stably by the urging force of the urging means. Further, by preventing the saw blade 20 from protruding from the bottom surface 40a of the base 40 in a state where the main body 10 and the base 40 are swung in the most separated direction, the bottom surface 40a of the base 40 is brought into contact with the workpiece. Thereafter, even when the bottom surface 40a of the base 40 is brought into contact with the material to be cut during the operation of pressing the main body 10 to perform cutting, the bottom surface 40a is not applied unless a pressing force that overcomes the biasing force of the biasing means is applied. Since the saw blade 20 does not protrude from the cutting, it is possible to prevent the cutting from being performed unexpectedly, and by releasing the pressing force applied to the main body 10 without stopping the motor at the end of the work, The work can be finished immediately and the workability can be improved. Further, the rocking restricting means is provided, and the lock lever 33 and the hook 14g are engaged to restrict the main body 10 from being swung in the direction approaching the base 40. By allowing the control state to be released by rotating 33, the pressing force in the direction in which the main body 10 swings so as to be close to the base 40 is unexpectedly applied to the main body 10 before the work starts. Even if it is added, it is possible to prevent the material to be cut from being damaged.

  In this embodiment, the lock lever 33 is provided on the saw cover 30 and the hook 14g is provided on the arm 14 of the main body 10. However, the saw cover 30 may be provided with a hook and the main body 10 may be provided with a lock lever. It is.

  As shown in FIG. 9, the non-main body side cover portion 32 is attached to the main body side cover portion 31 by a plurality of screws 32h (three in this embodiment).

  On the side opposite to the main body of the non-main body side cover portion 32, protrusions 32 a to 32 e constituting the support portion of the present invention are formed integrally with the anti-main body side cover portion 32.

  The protrusions 32a to 32c have a shape that represents the rotational direction of the saw blade 20, and the protrusion 32d is formed to constitute a pedestal that represents the name and name of the product. The protrusion 32e is formed on a substantially semicircular discharge portion 32f that forms the discharge port 34 together with the discharge portion 31j of the main body side cover portion 31 described above.

  The protrusions 32 a to 32 e have a shape having the same plane, and the plane is a plane substantially orthogonal to the swing shaft 50.

  Further, a long hole 32g having a substantially arc shape with the swing shaft 50 as a fulcrum is formed in the non-main body side cover portion 32, and the long hole 32g is a fixing member for the saw blade 20 even when the main body 10 swings. It is comprised so that it may not contact the 3rd washer 23 which is. Since the third washer 23 is exposed by forming the elongated hole 32g, the saw blade 20 can be replaced with the anti-main body side cover portion 32 attached to the main body side cover portion 31. Yes. The elongated hole 32g that allows the third washer 23 to be exposed has a minimum necessary shape so that the third washer 23 does not come into contact with the third washer 23. It is made to suppress that the chip | tip which flowed out to the outside is discharged | emitted from the long hole 32g.

  The protrusions 32a to 32c are arranged on the rear side (left side in FIG. 1) of the saw cover 30 when viewed from the elongated hole 32g, and the protrusion 32d is viewed from the upper center of the saw cover 30 when viewed from the elongated hole 32g. The right side of FIG. 1 is arranged, and at least the protrusion 32a and a part of the protrusion 32d are arranged so as to sandwich the rotation axis of the saw blade 20 along the cutting direction.

  The relationship between the saw cover 30 and the base 40 shown in FIGS. 1 to 8 and 12 is that the screw 40f is screwed into the first screw hole 31b and the main body side cover 31 is fixed to the base 40 as described above. However, in this state, it is configured such that other components do not protrude toward the anti-saw blade 20 side than the surfaces of the protrusions 32a to 32e on the anti-saw blade 20 side.

Next, an example of the cutting operation of the electric cutting machine configured as described above will be described.
When performing the edge cutting work (generally, the edge cutting work) of the floor board material as described with reference to FIG. 18 of the prior art, first, the main body 10 is swung upward as shown in FIGS. The electric cutting machine in a state where the lock lever 33 and the hook 14 g are moved is placed on the floor board 64 and the side surface 40 b of the base 40 is brought into contact with the baseboard 67.

  Then, after operating the start switch (not shown) of the main body 10 to drive the electric motor, the operation portion 33b of the lock lever 33 is operated to engage the engagement portion 33a of the lock lever 33 and the hook 14g of the arm 14. The pressing force is applied to the main body 10 so as to swing in the direction approaching the base 40 while holding the grip portion 11 of the main body 10.

  As a result, as shown in FIG. 5, the floor board material 64 can be cut along the baseboard 67, and the base 40 is slid on the floor board material 64 in this state, thereby extending over a wide range. Thus, it is possible to perform a cutting operation for cutting the floor board material 64.

  As described above, in the state shown in FIGS. 1 to 4, since the saw blade 20 is configured not to protrude from the bottom surface 40 a of the base 40, the electric cutting machine is mounted on the floor board material 64 before starting the cutting operation. When placing, it can be placed in a stable state, and the floor board 64 is not damaged. For this reason, it is also possible to mount an electric cutting machine on the floor board material 64 in the state which started the electric motor.

  At the end of the operation, the pressing force applied to the main body 10 is released, so that the main body 10 swings upward by the urging force of the coil spring 51 so that the saw blade 20 does not protrude from the bottom surface 40a of the base 40. Therefore, the cutting operation can be finished immediately, and then the start switch is operated to stop the electric motor.

  As described above, since the screw 40f for fixing the base 40 to the saw cover 30 is attached through the long hole 40e of the base 40, the side surface of the saw blade 20 and the side surface 40b of the base 40 are parallel to each other. Further, the attachment position of the saw cover 30 with respect to the base 40 can be adjusted, and the saw blade 20 protrudes from the vicinity of the intersection of the virtual surface including the bottom surface 40a and the virtual surface including the side surface 40b of the base 40. Therefore, the cutting operation can be performed with high accuracy.

  Further, by adjusting the position of the second washer 22 constituting the fixing member of the saw blade 20, the protruding position of the saw blade 20 from the bottom surface 40a of the base 40 can be adjusted, and cutting according to the work situation is possible. The position can be easily adjusted.

Next, a case where the baseboard 67 as described with reference to FIG. 19 is cut in parallel with the floor board material 64 will be described.
First, as shown in FIGS. 1 to 4, an electric cutting machine in which the main body 10 swings upward most and the lock lever 33 and the hook 14 g are engaged with each other is used for the saw cover 30 constituting the support portion of the present invention. The protrusions 32 a to 32 e are placed on the floor board 64, and a part of the bottom surface 40 a of the base 40 is brought into contact with the baseboard 67.

  Then, after operating the start switch (not shown) of the main body 10 to drive the electric motor, the operation portion 33b of the lock lever 33 is operated to engage the engagement portion 33a of the lock lever 33 and the hook 14g of the arm 14. The pressing force is applied to the main body 10 so as to swing in the direction approaching the base 40 while holding the grip portion 11 of the main body 10.

  As a result, as shown in FIG. 6, the baseboard 67 can be cut along the floor board material 64, and in this state, by sliding the support portion of the saw cover 30 on the floor board material 64, An operation of cutting the baseboard 67 in parallel with the floor board material 64 can be performed over a wide range.

  Since the support portion of the saw cover 30 has a surface parallel to the floor board material 64, the electric cutting machine can be placed on the floor board material 64 in a stable state, and an easy and accurate cutting operation can be performed. It is.

  Further, as described above, since the saw cover 30 supports the swing shaft 50 and the saw cover 30 does not move in the swing direction with respect to the base 40, the saw cover is moved when the main body 10 is swung and cut. Since 30 is a structure which does not move, even when rocking | fluctuating the main body 10, the state which mounted the electric cutting machine stably on the floor board material 64 can be maintained, and an accurate cutting operation can be performed. It can be done.

  In addition, as described above, the configuration in which the support portion is provided integrally with the saw cover 30 enables the electric cutting machine to be provided at a low cost without causing an increase in the number of parts and a deterioration in assemblability. Become. In addition, since the number of parts is not increased, a decrease in accuracy due to an increase in dimensional error can be suppressed.

  In addition, since the support portion is constituted by the plurality of protrusions 32a to 32e provided on the saw cover 30, the protrusion 32a to 32c can be used for other functions such as representing the rotation direction of the saw blade 20. Furthermore, when the saw cover 30 is provided with a discharge port 34 having a substantially circular cross section that allows connection of a hose connected to a dust collector, the entire surface of the saw cover 30 on the side of the anti-saw blade 20 is provided through the discharge port 34. Compared with the case where the structure is also protruded, it is possible to suppress the enlargement of the saw cover 30 and thus the entire product, and it is possible to suppress a decrease in the dust collection rate due to an increase in the area inside the saw cover 30. .

  In addition, since the support portion of the saw cover 30 is arranged so as to sandwich the rotating shaft of the saw blade 20 along the cutting direction, the support portion is stable when the cutting operation is performed while sliding the support portion on the floor plate material 64. The state can be maintained, and the cutting operation with high accuracy can be performed.

  Further, by adjusting the position of the second washer 22 constituting the fixing member of the saw blade 20 described above, the distance between the support portion of the saw cover 30 and the saw blade 20 can be adjusted, and the width from the floor board material 64 can be adjusted. The cutting position H of the tree 67 can be easily adjusted.

  As shown in FIG. 12, the above-described fixing member for the saw blade 20 is composed of only the first washer 21 and the third washer 23, and the saw blade 20 is sandwiched and fixed by the first washer 21 and the third washer 23. In addition, it is possible to adjust the cutting position H of the baseboard 67 from the floor board material 64 even if an intervening part such as the sleeve 24 is arranged between the spindle 12 and the first washer 21. .

  The state shown in FIG. 13 is a state in which the saw cover 30 and the base 40 are fixed by screwing the screws 40f into the screw holes 31c. In this state, the saw blade 20 with respect to the bottom surface 40a of the base 40 is used. Projecting at a right angle, and when the base 40 is placed on the material to be cut, cutting can be performed at a right angle to the upper surface of the material to be cut.

Next, another embodiment of the electric cutting machine of the present invention will be described with reference to FIG.
In this embodiment, instead of the support portion of the saw cover 30 of the above embodiment, the protruding length of the side surface 40b of the base 40 is increased. In addition to being able to perform cutting and cutting work, as shown in the figure, by placing the side surface 40b on the floor board material 64, it is possible to cut the baseboard 67 in parallel with the floor board material 64, and The cutting position H of the baseboard 67 from the floor board material 64 can be adjusted by adjusting the fixing position of the base 40 and the saw cover 30 by the screw 40f.

Next, another embodiment of the electric cutting machine of the present invention will be described with reference to FIG.
In this embodiment, in place of the support portion of the saw cover 30 of the above embodiment, the base 40 is fixed by the screw 40f through the first screw hole 31b, and the bottom surface 40a of the base 40 and the side surface of the saw blade 20 The guide 41 having the side surface 41 a that is inclined at the same angle as the angle of the base 40 and has a longer protruding length than the side surface 40 b of the base 40 can be fixed to the base 40.

  The guide 41 is fixed to the upper surface of the base 40 by fixing bolts 42, is slidable on the upper surface of the base 40, and can be fixed at an arbitrary position.

  By adopting such a configuration, it is possible to perform the cutting operation in the same manner as in the above embodiment, and as shown in the figure, by placing the side surface 41a of the guide 41 on the floor board material 64, 67 can be cut in parallel with the floor board material 64, and the cutting position H of the baseboard 67 from the floor board material 64 can be adjusted by adjusting the fixing position of the guide 41 to the base 40. Is something that can be done.

  As described above, according to the present invention, the arm 14, the base 40, and the saw cover 30 are attached to the existing electric grinder, so that the cutting work parallel to the floor surface can be accurately performed with respect to the cutting work and the material to be cut. The electric cutting machine to perform can be provided at low cost.

  In addition, this invention is not restricted to the structure of above-described embodiment, In the range which can show | play the same effect, various changes are possible.

The front right perspective view which shows one Embodiment of this invention electric cutting machine. The front left perspective view of the electric cutting machine shown in FIG. The partial cross section back side left perspective view of the electric cutting machine shown in FIG. The top view of the electric cutting machine shown in FIG. The principal part cross-section right side view which shows one operation state of the electric cutting machine shown in FIG. The principal part cross-sectional right side view which shows the other operation state of the electric cutting machine shown in FIG. The back left perspective view showing one embodiment of the saw cover and base which constitute the electric cutting machine of the present invention. FIG. 8 is a rear right perspective view of the saw cover and the base shown in FIG. 7. FIG. 8 is a development view of the saw cover and the base shown in FIG. 7. The front right perspective view which shows one Embodiment of the main body which comprises this invention electric cutting machine. The front right perspective view which shows one Embodiment of the electric grinder which comprises the main body of this invention electric cutting machine. The principal part cross-sectional right side view which shows the other operation state of the electric cutting machine shown in FIG. The principal part cross-sectional right side view which shows the other operation state of the electric cutting machine shown in FIG. The principal part cross-sectional right side view which shows other embodiment of this invention electric cutting machine. The principal part cross-sectional right side view which shows other embodiment of this invention electric cutting machine. The front side perspective view which shows an example of the conventional circular saw. Side surface sectional drawing which shows one operation state by an example of the conventional circular saw. Side surface sectional drawing which shows one operation state by the other example of the conventional circular saw. Sectional drawing explaining one cutting operation.

Explanation of symbols

10 is a main body, 11 is a gripping part, 12 is a spindle, 12a is a two-sided width part, 12b is a male screw part, 13 is a gear housing, 13a is a screw, 13b is a rotation support part, 14 is an arm, and 14a is a swing shaft attached Part, 14b is a spindle support part, 14c is a flange part, 14d is a screw through hole part, 14e is a first arm part, 14f is a second arm part, 14g is a hook, 15 is a sliding part, 15a and 15b are metal, 15c is a bolt, 20 is a saw blade, 21 is a first washer, 22 is a second washer, 23 is a third washer, 24 is a sleeve, 30 is a saw cover, 31 is a main body side cover portion, 32 is an anti-main body side cover portion, Reference numeral 33 denotes a lock lever, 34 denotes a discharge port, 40 denotes a base, 41 denotes a guide, 42 denotes a fixing bolt, 50 denotes a swing shaft, and 51 denotes a coil spring.

Claims (14)

An electric motor, a main body incorporating the electric motor, a blade that is rotationally driven by the electric motor, a saw cover that covers at least a part of the blade, and a base that is connected to the saw cover and is slidable on a material to be cut And a swing shaft substantially parallel to the rotation axis of the cutter, the main body can swing with respect to the base with the swing shaft as a fulcrum, and the cutter can protrude from the bottom surface of the base Electric cutting machine
A support portion having a surface substantially orthogonal to the swing axis is provided on the side surface opposite to the main body of the saw cover, and other components are disposed on the main body side from the surface of the support portion. Electric cutting machine.   2. The electric cutting machine according to claim 1, wherein the support portion is provided integrally with the saw cover.   The electric cutting machine according to claim 1, wherein the support portion is composed of a plurality of protrusions provided on the saw cover.   The electric cutting machine according to claim 1, wherein the support portion is disposed so as to sandwich a rotating shaft of the blade along the cutting direction.   The electric cutter according to any one of claims 1 to 4, wherein the blade can be retracted to a position that does not protrude from the bottom surface of the base.   The saw cover is provided so as not to move in the swing direction of the main body with respect to the base, and extends in the swing direction allowing a part of the main body to swing with respect to the saw cover. The electric cutting machine according to any one of claims 1 to 5, wherein the electric cutting machine is provided.   The side surface of the base and the side surface of the cutting tool are inclined, and the cutting tool can be projected from the vicinity of the intersection where the virtual surface including the bottom surface of the base and the virtual surface including the side surface of the base intersect. The electric cutting machine according to any one of claims 1 to 6.   The electric cutter according to any one of claims 1 to 7, wherein the cutter is capable of adjusting a fixed position in a rotation axis direction with respect to the main body in the saw cover.   The main body has a spindle that is rotated by driving of the electric motor, and is provided so as to be rotatable integrally with the spindle. The first washer is located on the electric motor side with respect to the blade, and the outer periphery of the first washer A second washer having an internally threaded portion that can be screwed with the formed external threaded portion, an internal threaded portion that can be screwed with the externally threaded portion formed on the outer periphery of the spindle, and positioned on the side opposite to the motor with respect to the blade 9. The electric cutting machine according to claim 8, wherein a third washer is provided, and the cutter is sandwiched and fixed on the spindle by the second washer and the third washer.   An urging means for urging the main body and the base to move away from each other with the rocking shaft as a fulcrum is provided, and the inner wall of the saw cover in a state where the main body and the base are moved away from each other. The electric cutting machine according to any one of claims 1 to 9, further comprising a swing restricting means for restricting swing so that the blade does not come into contact with the cutter.   The swing restricting means includes a lock lever that is rotatably provided on the saw cover or the main body, and a hook that is provided on the main body or the saw cover and is engageable with the lock lever. It is possible to restrict the main body from swinging in a direction approaching the base by engaging with a hook, and to release the restricted state by rotating the lock lever in the restricted state. The electric cutting machine according to claim 10, wherein   The main body has an arm whose one end is rotatably connected to the swing shaft of the saw cover, a housing that is non-rotatably connected to the arm, and a shape that includes the electric motor and extends in the direction of the rotational axis of the electric motor. The electric cutting machine according to any one of claims 1 to 11, wherein the electric cutting machine comprises an electric granida having a gripped portion.   The saw cover is provided with a rail having a wall surface extending perpendicularly to the rocking shaft and having a substantially arc shape with the rocking shaft as a fulcrum, and the main body is slidable on the wall surface of the rail. The electric cutting machine according to claim 12, further comprising a moving part. An electric motor, a main body incorporating the electric motor, a blade that is rotationally driven by the electric motor, a saw cover that covers at least a part of the blade, and a base that is connected to the saw cover and is slidable on a material to be cut And a swing shaft substantially parallel to the rotation axis of the cutter, the main body can swing with respect to the base with the swing shaft as a fulcrum, and the cutter can protrude from the bottom surface of the base Electric cutting machine
A support portion having a surface substantially orthogonal to the swing axis is provided on the opposite side surface of the main body of the saw cover, and a cutting operation performed while sliding the base bottom surface on the material to be cut, and in the vicinity of the material to be cut An electric cutting machine capable of performing a cutting operation while sliding the support portion on a floor surface or the like that is positioned at a different angle from the material to be cut.

Images