JP4446285B2 - Portable cutting machine - Google Patents

Description

  The present invention relates to a portable cutting machine having a function of tilting a saw blade.

  A typical example of a portable cutting machine will be described below using a portable circular saw.

  A portable circular saw generally includes a base that slides on a work material and a main body that includes a saw blade that protrudes from a lower surface of the base. The portable circular saw has a rotation fulcrum extending substantially parallel to the axial direction, and the main body and the base are relatively rotatable with the rotation fulcrum as a fulcrum. The amount of protrusion of the saw blade, that is, the depth of cut with respect to the work material can be changed.

  The portable circular saw has an inclined fulcrum that is substantially perpendicular to the rotation axis of the circular saw and extends substantially along the side surface of the circular saw, and the main body and the base are relatively tiltable with the inclined fulcrum serving as a fulcrum. The angle of the side surface of the saw blade with respect to the base bottom surface, that is, the cutting angle can be inclined by the tilting. Hereinafter, a mechanism capable of changing the cutting depth of the saw blade is referred to as a cutting depth adjusting mechanism, and a mechanism capable of changing the cutting angle of the saw blade is referred to as an inclined cutting mechanism.

  The tilt cutting mechanism is, for example, tilt angle 0 ° (the angle between the side surface of the circular saw and the base bottom surface is a right angle), that is, from a position perpendicular to the work material to a tilt position with a tilt angle of 45 ° laterally, for example. It is possible to change within the range. In addition, the cutting form of the portable circular saw at a right angle position where the inclination angle of the saw blade is 0 ° is a cutting form called “right angle cutting” which is most frequently used. Moreover, the cutting form of the portable circular saw at the standard inclination position in which the angle between the side surface of the saw blade and the bottom surface of the base is 45 ° is a cutting form called “standard inclined cutting” that is frequently used after the right angle cutting. . Since the main body tilts integrally with the saw blade, the tilt angles of the main body and the saw blade are the same.

In portable circular saws, the angle accuracy in the above-described right angle position and the standard inclined cutting configuration is particularly required. Therefore, the main body or the base is provided with an adjusting screw that comes into contact with the base or the main body to adjust the angle accuracy. Is provided. (For example, see Patent Document 1)
In addition, in the case of a configuration that can be tilted in a range exceeding the right angle position or the standard tilt position (for example, a configuration that can tilt in a range of −10 ° to 55 °), tilting is performed at a frequently used right angle position or standard tilt position. It is configured with a stopper function to stop operation once, and can be tilted after the stopper function is activated or when the stopper function is not activated when tilting beyond a normal position or standard position. It is trying to become. (See, for example, Patent Document 2, Patent Document 3, and Patent Document 4)
Since the work material may deteriorate in appearance of the mating surface as shown in FIG. 20 due to expansion of the work material due to moisture absorption, at least one mating surface cutting is performed at a right angle position or a standard inclination to prevent this. A cutting operation beyond the position is performed. Specifically, one or both cut surfaces are cut at −10 ° or + 10 °, or 55 ° or 35 °.

JP 58-11101 A

Japanese Utility Model Publication No. 62-87801 Japanese Utility Model Publication No. 61-138501 US Pat. No. 5,433,008

  The above-described conventional portable circular saw has a bevel plate provided with an arcuate guide hole centered on a tilting fulcrum at the base, and a tilt fixing bolt inserted into the guide hole is provided on the main body. In the portable circular saw disclosed in Patent Document 2, the tilt of the base is positioned at a right angle position and a position exceeding the right angle position by the shape of the guide hole of the bevel plate. However, since the bevel plate is usually provided in the vicinity of the base end surface in front of the cutting direction, the visibility in the front of the cutting direction is lowered.

  Further, in the portable circular saw disclosed in Patent Document 3 and Patent Document 4, the right angle position and the right angle position are set by rotating the bolt itself or a member provided on the outer periphery of the shaft portion of the bolt inside the bevel plate. The position of the guide hole of the bevel plate is increased because it requires a space where the rotating member can rotate. As described above, the bevel plate is enlarged. Note that the portable circular saw described in Patent Document 4 has a configuration in which an adjustment screw protruding into the guide hole is provided on the bevel plate for the purpose of improving accuracy at a right angle position and a standard inclination position. The plate became large and the operability of the adjusting screw was poor.

  Also, for tilting beyond a right angle position or standard tilt position, positioning is performed at a fixed position because the bolt is positioned by contacting the end face of the guide hole. As for the tilt exceeding the standard tilt position, it is necessary to fix the tilt while the main body and the base are held while tilting to an arbitrary position, and the operability is poor.

  In addition, when tilting is fixed in a positioned state, it is always possible to obtain only a certain tilt angle, so positioning at an arbitrary tilt angle according to the work situation cannot be performed, and operability is poor. It was a thing.

  An object of the present invention is to provide a portable electric cutting machine that solves the above-mentioned drawbacks and has good operability in tilting operation.

  The purpose is to provide the stopper member so as to be movable in the axial direction, to enable positioning at least at two or more predetermined axial positions, and to provide the stopper member or an adjustment screw capable of moving in the axial direction at the contact point of the stopper member. Is achieved.

  According to the present invention, the stopper member is provided so as to be movable in the axial direction, can be positioned at at least two predetermined axial positions, and the stopper member or an adjusting screw capable of moving in the axial direction at the contact portion of the stopper member is provided. By providing it, it is possible to adjust the positioning position of the right angle position or standard tilt position, and it is possible to perform cutting work at a right angle position or standard tilt position with high accuracy, and tilting beyond the right angle position or standard tilt position is possible. It is possible to provide a portable cutting machine that is possible and has good operability.

  A portable circular saw which is an embodiment of the portable cutting machine of the present invention will be described below with reference to FIGS. 1 is a front view showing an embodiment of the portable circular saw of the present invention, FIG. 2 is a plan view showing the portable circular saw of FIG. 1, and FIG. 3 is a left side view showing the portable circular saw of FIG. is there. The right side of FIG. 1 and the lower side of FIG. 2 correspond to the front of the portable circular saw (front in the cutting direction), and the left side of FIG. 1 and the upper side of FIG. 2 correspond to the rear (back in the cutting direction). The circular saw is turned by rotating the circular saw counterclockwise in FIG. 1 and moving the main body to the right side of FIG.

  The portable circular saw includes a base 1 slidable on a work material and a main body 2 containing an electric motor. A saw blade 3 driven by an electric motor is rotatably held on the left side of the main body 2. The main body 2 corresponds to the cutting machine main body referred to in this specification.

  The main body 2 is connected to be pivotable, that is, tiltable, by a support shaft 4 disposed in the base 1 at the front in the cutting direction and a support shaft 5 at the rear side. The support shafts 4 and 5 are tilting fulcrums of the present invention, and the support shafts 4 and 5 are formed so as to be substantially orthogonal to the rotation axis of the saw blade 3 and extend substantially parallel to the side surface of the saw blade 3. .

  The main body 2 and the base 3 can be rotated relative to each other with the support shafts 4 and 5 as fulcrums as indicated by arrows in FIG. As shown in FIG.

  In the right angle state shown in FIG. 3, the work material can be cut at right angles, and the base 3 and the main body 2 are relatively rotated from the state of FIG. By setting to, the work material can be inclined and cut.

  When the main body 2 is in a right angle cutting state, the saw blade 3 is perpendicular to the base 1 and the work material, and can cut the work material at a right angle.

  In FIG. 1, the main body 2 is provided with a cover 6 that covers substantially the outer periphery of the upper half of the saw blade 3 so as not to move integrally or separately. Furthermore, the main body 2 is provided with a hogo cover 7 that covers the outer periphery of the lower half of the saw blade 3 in a rotatable manner. The hogo cover 7 is shown in a closed state in FIG. 1, and when cutting a work material, the hogo cover 7 is rotated so as to be opened clockwise in FIG. 1 by moving the portable circular saw forward. . The hogo cover 7 can also be rotated by manually operating a lever 8 provided integrally with the rear upper portion of the hogo cover 7.

  Next, the inclination and inclination fixing mechanism in the portable circular saw will be described.

  As shown in FIG. 1, the tilt and tilt fixing mechanism is provided around the support shaft portion 4 in the vicinity of the end surface of the base 3 on the front side in the cutting direction.

  The tilting and tilting fixing mechanism is provided with the above-described supporting shafts 4 and 5, the bevel plate 9 projecting upward on the upper surface of the base 1, and the supporting shaft 4 so as to be rotatable about the supporting shaft 4 as a fulcrum. A bevel piece 11 having a supporting portion 12, a rotating shaft 14 held by the supporting portion 12 of the bevel piece 11 and extending substantially parallel to the rotating shaft of the saw blade 3, and a screw hole 22 of the bevel piece 11. It has the structure which has the volt | bolt 21 extended in the substantially same direction as the axial direction of the spindles 4 and 5, the cutting direction front end part of the volt | bolt 21, and the operation knob 20 fixed by rotation.

  The bevel plate 9 has an arcuate guide hole 10 with the support shaft 4 as a fulcrum, and a shaft portion of a bolt 21 is inserted into the guide hole 10.

  The base 1 and the main body 2 can be rotated relative to each other with the rotation shaft 14 as a fulcrum, and the protrusion amount of the saw blade 3 from the bottom surface of the base 1 can be adjusted by the rotation. This rotation is fixed by fixing the link 18 to the cover 6 with a bolt 30 provided on the rear side in the cutting direction.

  As shown in FIGS. 4 and 5, stopper members 16 described later are provided on the left and right ends of the bevel piece 11. Note that the bevel piece 11 is tilted with respect to the base 1 together with the main body 2, and is therefore a part of the main body in the present invention.

  Note that the support shaft 5 on the rear side in the cutting direction is supported by a protrusion 17 protruding upward from the base 1, and a link 18 that is rotatable about the support shaft 5 is connected to the support shaft 5. Can be fixed to the main body 2 by bolts 30 attached to the cover 6, and the main body 2 and the base 1 can be tilted with the support shafts 4 and 5 as fulcrums.

  As shown in FIG. 5, the bevel plate 9 and the bevel piece 11 can be fixed and released by a lock bolt 19 including a bolt 21 and an operation knob.

  When the main body 2 is tilted, the bevel piece 11 rotates and the screw shaft portion 21 moves along the guide hole 10. In the portable circular saw of the present invention, the length of the guide hole 10 is such that the guide hole 10 is formed over a range of about 60 ° with the support shaft 4 as a fulcrum. It is designed to have a dimension that allows the screw shaft portion 21 to move along with the tilting from the angle of 50 ° to the position of the tilting angle of 50 °.

  When the lock bolt 19 is tightened, the bevel piece 11 is fixed to the bevel plate 9 and the main body 2 is fixed to the base 1. Further, when the lock bolt 19 is loosened, the fixing is released, the bevel piece 11 can be rotated with respect to the bevel plate 9, and the main body 2 can be tilted.

  Next, an embodiment of a stopper mechanism constituting the portable circular saw of the present invention will be described with reference to FIGS.

  As described above, the stopper members 16 of the tilt mechanism are provided at the left and right end portions of the bevel piece 11 provided in the front portion of the main body 2. In the present invention, as shown in FIGS. 7 and 8, the stopper member 16 is provided on the bevel piece 11 so as to be movable in the axial direction, so that the angle of the side surface of the saw blade 3 with respect to the bottom surface of the base 1 is at right angles as shown in FIG. From the right angle state, the main body 2 can be tilted with respect to the base 1 in the direction opposite to the standard tilt position from the right angle position as shown in FIG.

  As shown in the drawing, the stopper member 16 is provided with a plurality of grooves 16a orthogonal to the axial direction. Further, as shown in FIG. 11, a ball 24 which is a protrusion that can be engaged with the groove portion 16 a of the stopper member 16 is provided at a location corresponding to the stopper member 16 of the bevel piece 11, and the ball member 24 is biased. It is urged toward the stopper member 16 by a spring 23 as a means.

  The stopper member 16 is positioned in the axial direction by the engagement between the ball member 24 and the groove 16a. In the present embodiment, the stopper member 16 is provided with eight groove portions 16a, and can be positioned at eight positions by engagement between the ball member 24 and the groove portion 16a.

  Further, the groove portion 16a of the stopper member 16 is set to have a configuration in which the interval T between adjacent groove portions 16a satisfies T = L · [tan α ° −tan (α ° −θ)] as shown in FIG. By moving the stopper member 16 in the axial direction and changing the groove 16a with which the ball member 24 is engaged, the inclination angle of the saw blade 3 and the base 1 can be positioned in increments of θ °.

  Further, as shown in the drawing, a screw portion 25 is formed at the lower portion of the stopper member 16 on the base 1 side, and an adjustment nut member 26 as an adjustment screw is screwed onto the screw portion 25 and attached.

  The adjustment nut member 26 can be brought into contact with the upper surface of the base 1, and when the adjustment nut member 26 is brought into contact in the state shown in FIG. 7, the angle of the bottom surface of the base 1 with respect to the side surface of the saw blade 3 becomes a right angle state. As shown in FIG. 8, the stopper member 16 is moved upward in the axial direction against the urging force of the spring 23 from the state shown in FIG. 7, and the upper end surface of the adjusting nut member 26 is moved to the lower part of the base 1 side of the bevel piece 11. When moved to contact, it can be tilted to a tilted position of −5 ° beyond the right angle position.

  When the perpendicular position is 0 °, the direction in which the main body 1 rotates in the counterclockwise direction shown in FIG. 7 with the support shafts 4 and 5 as the fulcrum is the positive direction, and the direction in which the main body 1 rotates in the clockwise direction is the negative direction. An operation procedure for tilting in the negative direction from the right angle state shown in FIG. 7 will be described.

  The stopper member 16 is moved upward in the drawing from the state shown in FIG. 7, and the ball member 24 is engaged with the arbitrary groove 16a. Even when the stopper member 16 is moved, the ball member 24 is in contact with the stopper member 16 by the urging force of the spring 23, so that a click feeling is given to the movement of the stopper member 16, and the operator can move the ball member 24. It is possible to recognize how many groove portions 16 a have been overcome, that is, the amount of movement of the stopper member 16.

  The worker stops the movement when the ball member 24 gets over the groove 16a by an arbitrary number of minutes.

  Next, in order to release the fixation of the tilt of the main body 2 with respect to the base 1, the lock bolt 19 is loosened, and the main body 2 is tilted with respect to the base 1 until the adjusting nut member 26 contacts the upper surface of the base 1.

  Further, in the tilted state in which the adjusting nut member 26 is in contact with the upper surface of the base 1, the lock bolt 19 is tightened again to fix the tilting of the main body 2 with respect to the base 1, so that the right angle state shown in FIG. The tilting operation is performed.

  In addition, by rotating the adjusting nut member 26 with respect to the stopper member 16 in the state shown in FIG. 9, it is possible to accurately obtain the perpendicularity of the side surface of the saw blade 3 with respect to the bottom surface of the base 1.

  As described above, the stopper member 16 can be moved in the axial direction, can be positioned at least at two or more predetermined axial positions, and can be further adjusted to the stopper member 16 in the axial direction. The positioning position of the right angle position can be adjusted without increasing the size of the bevel plate 9, the cutting operation at the right angle position with high accuracy is possible, and tilting beyond the right angle position is possible. In addition, a portable circular saw with good operability can be provided.

  In addition, the stopper member 16 can be moved further to the base 1 side than the right angle state shown in FIG. 9, so that even the position slightly inclined in the plus direction from the right angle position can be easily positioned, and the operability is further improved. improves.

  Further, as shown in the figure, the stopper member 16, the ball member 24, the spring 23, and the adjusting nut member 26 described above are also in contact with the upper surface of the base 1 when inclined to the standard inclined position (45 °). Accordingly, it is possible to perform cutting work at a standard tilt position with high accuracy, and to tilt beyond the standard tilt position, thereby improving operability.

  Next, another embodiment of the portable circular saw of the present invention will be described with reference to FIGS. In the present embodiment, the stopper member 16 and the main body 2 (a part of the bevel piece 11) of the above-described embodiment are improved, and description of other portions is omitted.

  As shown in the drawing, the stopper member 16 is formed with a male screw 16b, and a groove portion 16c extending in the axial direction is formed within the range of the male screw 16b. Although not shown, a female screw 16b that can be screwed with a male screw 16b is provided at a location of the bevel piece 11 corresponding to the stopper member 16, and a protrusion (such as a ball member 24) that can be engaged with the groove 16c is provided. ing.

  In the portable circular saw having such a configuration, each time the stopper member 16 is rotated, the protruding portion and the groove portion 16c are engaged with each other, so that the stopper member 16 can be positioned every rotation.

  By adopting a configuration in which the stopper member 16 is positioned every rotation as described above, an arbitrary inclination change amount can be easily obtained by the number of rotations, and the operability can be further improved. is there.

  If the pitch of the male screw 16b is set so that the inclination change angle when the stopper member 16 is rotated once becomes an easy-to-understand angle such as 0.5 ° or 1 °, the operator can rotate the stopper member 16. Since the number of rotations can be known from the locking sound of the ball member, the inclination angle of the side surface of the saw blade 3 with respect to the bottom surface of the base 1 can be determined by a simple calculation such as the number of rotations × 0.5 ° or the number of rotations × 1 °. It can be set easily and accurately without the need for tools.

  Even when the male screw 16b having a constant screw pitch is formed on the stopper member 16, the amount of change in the inclination angle by one rotation of the stopper member 16 is very slightly different. Rough calculation can be made and operability is improved.

  An application example of the above embodiment is shown in FIG.

  In the above embodiment, the stopper member 16 is arranged so as to extend in a direction substantially perpendicular to the rotation shaft 14 on the outer peripheral direction of the support shaft 4. However, in this embodiment, the stopper member 16 is attached to the rotation shaft 14. It arrange | positions so that it may incline with respect.

  By adopting such a configuration, even when the screw pitch of the male screw 16b is an inexpensive standard pitch dimension, the inclination angle that changes when the stopper member 16 is rotated once by appropriately setting θ1. Can be set to an angle approximate to an easily understandable angle such as 0.5 ° or 1 °, and the inclination angle of the side surface of the saw blade 3 with respect to the bottom surface of the base 1 can be easily set.

  Next, another embodiment of the portable circular saw of the present invention will be described with reference to FIGS.

  In the present embodiment, as shown in the figure, the stopper member 16 is provided with a plurality of holes 16d, and the bevel piece 11 is provided with a pin member 27 as a protruding portion. However, as shown in FIG. By pulling out the member 27 from the hole 16d of the stopper member 16, the stopper member 16 can be moved in the axial direction, and by engaging the pin member 27 in the hole 16d, the stopper member 16 can be positioned. As shown in the figure, an adjustment screw 28 is provided at a position of the base 1 where the stopper member 16 abuts, thereby enabling fine adjustment at a predetermined angle (perpendicular angle), and the pin member 27 is always attached to the stopper member 16. A spring 23 that biases the side is provided.

  In the present embodiment, the same operational effects as those of the above-described embodiments can be obtained.

The front view which shows one Embodiment of this invention portable cutting machine. The top view which shows one Embodiment of this invention portable cutting machine. The left view which shows one Embodiment of this invention portable cutting machine. The principal part enlarged view of FIG. The principal part enlarged view of FIG. The principal part enlarged view of FIG. 3 which shows one operation state of this invention portable cutting machine. The principal part enlarged view of FIG. 3 which shows one operation state of this invention portable cutting machine. The principal part enlarged view of FIG. 3 which shows one operation state of this invention portable cutting machine. The principal part enlarged view of FIG. 3 which shows one operation state of this invention portable cutting machine. The front view which shows one Embodiment of the stopper member which comprises this invention portable cutting machine. AA line sectional view of Drawing 7. The principal part enlarged view of FIG. 3 which shows one operation state of this invention portable cutting machine. The front view which shows other embodiment of the stopper member which comprises this invention portable cutting machine. FIG. 14 is a sectional view taken along line BB in FIG. 13. The principal part enlarged view which shows other embodiment of this invention portable cutting machine. The principal part enlarged view which shows other embodiment of this invention portable cutting machine. The CC sectional view taken on the line of FIG. The CC sectional view taken on the line which shows the operation state of the portable cutting machine of FIG.

Explanation of symbols

1 is a base, 2 is a main body, 3 is a saw blade, 4 is a front support shaft, 5 is a rear support shaft, 6 is a cover, 7 is a hogo cover, 8 is a lever, 9 is a bevel plate, 10 is a guide hole, 11 is A bevel piece, 12 is a support portion, 13 is a hinge portion, 14 is a screw member, 15 is a nut member, 16 is a stopper member, 17 is a projection, 18 is a link, 19 is a lock bolt, 20 is an operation knob, and 21 is a screw shaft. , 22 is a screw hole, 23 is an elastic body, 24 is a ball member, 25 is a stopper member lower screw portion, 26 is an adjustment nut member, 27 is a pin member, and 28 is an adjustment screw member.

Claims (8)

A main body having a built-in electric motor; a saw blade driven by the electric motor; a cover provided on the main body and covering a part of the outer periphery of the saw blade; and the main body that is positioned below the main body and is slidable on a work material A portable cutting machine having a base that can be tilted with respect to the main body using the tilted fulcrum as a fulcrum, and a stopper member that restricts the tilt of the base relative to the main body,
The stopper member has a male screw portion that can be screwed with a female screw portion provided in the main body, and a groove portion that extends in the axial direction within the range of the male screw portion, and the main body has a protruding portion that can be engaged with the groove portion. Have
The stopper member is provided so as to be movable in the axial direction, and can be positioned at least at two or more predetermined axial positions, and further provided with an adjusting screw capable of moving in the axial direction at the stopper member or a contact portion of the stopper member. A portable cutting machine.   The portable cutting machine according to claim 1, wherein the stopper member is provided on the main body, and the adjustment screw is provided on the base.   The portable electric cutting machine according to claim 1, wherein the adjustment screw is provided at an end of the stopper member on the base side, and the adjustment screw can contact a part of the base.   The portable cutting machine according to any one of claims 1 to 3, wherein the stopper member can be positioned at three or more predetermined axial positions.   The portable cutting machine according to claim 3, wherein the stopper member is positioned by the adjustment screw abutting on a lower portion of the main body. The stopper member is a stopper member that can contact when the angle between the base bottom surface and the saw blade side surface is a right angle, and the stopper member when the angle between the base bottom surface and the saw blade side surface is 45 °. portable cutting machine according to claim 1 to claim 5, wherein further comprising a contact capable one stopper member. The said stopper member has a some recessed part in the position spaced apart in the axial direction, The said main body has a protrusion part engageable with this recessed part, The any one of Claims 1-6 characterized by the above-mentioned. Portable cutting machine.   The portable cutting machine according to claim 1, further comprising an urging unit that urges the protrusion toward the stopper member.

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